TY - JOUR
A1 - Lewek, Tobias
ED - Mientus, Lukas
ED - Klempin, Christiane
ED - Nowak, Anna
T1 - Das Außerunterrichtliche Pädagogische Praktikum als kasuistisches Reflexionsangebot
JF - Reflexion in der Lehrkräftebildung: Empirisch – Phasenübergreifend – Interdisziplinär (Potsdamer Beiträge zur Lehrerbildung und Bildungsforschung ; 4)
N2 - Dieser Beitrag beschäftigt sich mit den Herausforderungen der Professionalisierung angehender Lehrkräfte im Rahmen der universitären Lehrkräftebildung und nimmt dabei kasuistische Lehrformate als wichtige Elemente hochschuldidaktischer Konzeptionen in den Blick. In diesem Zusammenhang wird das Modul „Außerunterrichtliches Pädagogisches Praktikum“ (AuPP) als ein zentrales Element der Praxisphasen des Lehramtsstudiums an der Martin-Luther-Universität Halle-Wittenberg (MLU) vorgestellt. Im Rahmen dieses Moduls wird versucht, durch die Arbeit an konkreten Fällen aus der pädagogischen Praxis – gemeint sind vor allem Beobachtungsprotokolle und Transkripte von Interviewauszügen aus unterschiedlichen (sozial-)pädagogischen Handlungsfeldern – einen reflexiven Zugang zu Spannungsmomenten, Problem- und Krisendynamiken, Orientierungsmustern der Akteur:innen sowie Gelingensbedingungen pädagogischer Praxis für angehende Lehrpersonen zu eröffnen und darüber einen reflexiven Habitus anzubahnen, der für die weitere Berufsbiografie und Professionalisierung essenziell erscheint.
KW - kasuistische Lehrkräftebildung
KW - Fallverstehen
KW - qualitativ-rekonstruktive Methoden der Sozialforschung
KW - Fallarbeit
KW - reflexiver Habitus
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-631991
SN - 978-3-86956-566-8
SN - 2626-3556
SN - 2626-4722
IS - 4
SP - 437
EP - 443
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Prahl, Boris F.
A1 - Boettle, Markus
A1 - Costa, Luís Fílípe Carvalho da
A1 - Kropp, Jürgen
A1 - Rybski, Diego
T1 - Damage and protection cost curves for coastal floods within the 600 largest European cities
JF - Scientific Data
N2 - The economic assessment of the impacts of storm surges and sea-level rise in coastal cities requires high-level information on the damage and protection costs associated with varying flood heights. We provide a systematically and consistently calculated dataset of macroscale damage and protection cost curves for the 600 largest European coastal cities opening the perspective for a wide range of applications. Offering the first comprehensive dataset to include the costs of dike protection, we provide the underpinning information to run comparative assessments of costs and benefits of coastal adaptation. Aggregate cost curves for coastal flooding at the city-level are commonly regarded as by-products of impact assessments and are generally not published as a standalone dataset. Hence, our work also aims at initiating a more critical discussion on the availability and derivation of cost curves.
Y1 - 2018
U6 - https://doi.org/10.1038/sdata.2018.34
SN - 2052-4463
VL - 5
PB - Nature Publ. Group
CY - London
ER -
TY - JOUR
A1 - Koelman, Liselot A.
A1 - Pivovarova-Ramich, Olga
A1 - Pfeiffer, Andreas F. H.
A1 - Grune, Tilman
A1 - Aleksandrova, Krasimira
T1 - Cytokines for evaluation of chronic inflammatory status in ageing research
BT - reliability and phenotypic characterisation
JF - Immunity & Ageing
N2 - Background: There is a growing interest in the role of inflammageing for chronic disease development. Cytokines are potent soluble immune mediators that can be used as target biomarkers of inflammageing; however, their measurement in human samples has been challenging. This study aimed to assess the reliability of a pro- and anti-inflammatory cytokine panel in a sample of healthy people measured with a novel electrochemiluminescent multiplex immunoassay platform (Meso Scale Discovery, MSD), and to characterize their associations with metabolic and inflammatory phenotypes.
KW - Reliability
KW - Cytokines
KW - Multiplex platforms
KW - Inflammaging
KW - Biomarkers
KW - Ageing
KW - BMI
Y1 - 2019
U6 - https://doi.org/10.1186/s12979-019-0151-1
SN - 1742-4933
VL - 16
PB - BMC
CY - London
ER -
TY - JOUR
A1 - López-Salas, Nieves
A1 - Albero, Josep
T1 - CxNy
BT - new carbon nitride organic photocatalysts
JF - Frontiers in Materials
N2 - The search for metal-free and visible light-responsive materials for photocatalytic applications has attracted the interest of not only academics but also the industry in the last decades. Since graphitic carbon nitride (g-C3N4) was first reported as a metal-free photocatalyst, this has been widely investigated in different light-driven reactions. However, the high recombination rate, low electrical conductivity, and lack of photoresponse in most of the visible range have elicited the search for alternatives. In this regard, a broad family of carbon nitride (CxNy) materials was anticipated several decades ago. However, the attention of the researchers in these materials has just been awakened in the last years due to the recent success in the syntheses of some of these materials (i.e., C3N3, C2N, C3N, and C3N5, among others), together with theoretical simulations pointing at the excellent physico-chemical properties (i.e., crystalline structure and chemical morphology, electronic configuration and semiconducting nature, or high refractive index and hardness, among others) and optoelectronic applications of these materials. The performance of CxNy, beyond C3N4, has been barely evaluated in real applications, including energy conversion, storage, and adsorption technologies, and further work must be carried out, especially experimentally, in order to confirm the high expectations raised by simulations and theoretical calculations. Herein, we have summarized the scarce literature related to recent results reporting the synthetic routes, structures, and performance of these materials as photocatalysts. Moreover, the challenges and perspectives at the forefront of this field using CxNy materials are disclosed. We aim to stimulate the research of this new generation of CxNy-based photocatalysts, beyond C3N4, with improved photocatalytic efficiencies by harnessing the striking structural, electronic, and optical properties of this new family of materials.
KW - CXNY
KW - carbon nitrides
KW - C2N
KW - C3N
KW - C1N1
KW - C3N5
KW - photocatalysis
Y1 - 2021
U6 - https://doi.org/10.3389/fmats.2021.772200
SN - 2296-8016
VL - 8
PB - Frontiers Media
CY - Lausanne
ER -
TY - JOUR
A1 - Compart, Julia
A1 - Singh, Aakanksha
A1 - Fettke, Jörg
A1 - Apriyanto, Ardha
T1 - Customizing starch properties
BT - a review of starch modifications and their applications
JF - Polymers
N2 - Starch has been a convenient, economically important polymer with substantial applications in the food and processing industry. However, native starches present restricted applications, which hinder their industrial usage. Therefore, modification of starch is carried out to augment the positive characteristics and eliminate the limitations of the native starches. Modifications of starch can result in generating novel polymers with numerous functional and value-added properties that suit the needs of the industry. Here, we summarize the possible starch modifications in planta and outside the plant system (physical, chemical, and enzymatic) and their corresponding applications. In addition, this review will highlight the implications of each starch property adjustment.
KW - starch
KW - starch modification
KW - in planta modification
KW - physical modification
KW - chemical modification
KW - enzymatic modification
KW - starch application
Y1 - 2023
U6 - https://doi.org/10.3390/polym15163491
SN - 2073-4360
VL - 15
IS - 16
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Omotosho, Adebayo
A1 - Ayegba, Peace
A1 - Emuoyibofarhe, Justice
A1 - Meinel, Christoph
T1 - Current State of ICT in Healthcare Delivery in Developing Countries
JF - International Journal of Online and Biomedical Engineering
N2 - Electronic health is one of the most popular applications of information and communication technologies and it has contributed immensely to health delivery through the provision of quality health service and ubiquitous access at a lower cost. Even though this mode of health service is increasingly becoming known or used in developing nations, these countries are faced with a myriad of challenges when implementing and deploying e-health services on both small and large scale. It is estimated that the Africa population alone carries the highest percentage of the world’s global diseases despite its certain level of e-health adoption. This paper aims at analyzing the progress so far and the current state of e-health in developing countries particularly Africa and propose a framework for further improvement.
KW - E-health
KW - developing countries
KW - framework
KW - ICT
KW - healthcare
Y1 - 2019
U6 - https://doi.org/10.3991/ijoe.v15i08.10294
SN - 2626-8493
VL - 15
IS - 8
SP - 91
EP - 107
PB - Kassel University Press
CY - Kassel
ER -
TY - JOUR
A1 - Omranian, Sara
A1 - Nikoloski, Zoran
T1 - CUBCO+: prediction of protein complexes based on min-cut network partitioning into biclique spanned subgraphs
JF - Applied Network Science
N2 - High-throughput proteomics approaches have resulted in large-scale protein–protein interaction (PPI) networks that have been employed for the prediction of protein complexes. However, PPI networks contain false-positive as well as false-negative PPIs that affect the protein complex prediction algorithms. To address this issue, here we propose an algorithm called CUBCO+ that: (1) employs GO semantic similarity to retain only biologically relevant interactions with a high similarity score, (2) based on link prediction approaches, scores the false-negative edges, and (3) incorporates the resulting scores to predict protein complexes. Through comprehensive analyses with PPIs from Escherichia coli, Saccharomyces cerevisiae, and Homo sapiens, we show that CUBCO+ performs as well as the approaches that predict protein complexes based on recently introduced graph partitions into biclique spanned subgraphs and outperforms the other state-of-the-art approaches. Moreover, we illustrate that in combination with GO semantic similarity, CUBCO+ enables us to predict more accurate protein complexes in 36% of the cases in comparison to CUBCO as its predecessor.
KW - Protein complexes
KW - Protein–protein interaction
KW - Network clustering
KW - Species comparison
Y1 - 2022
U6 - https://doi.org/10.1007/s41109-022-00508-5
SN - 2364-8228
VL - 7
PB - Springer International Publishing
CY - Cham
ER -
TY - JOUR
A1 - Beermann, Jan
A1 - Westbury, Michael V.
A1 - Hofreiter, Michael
A1 - Hilgers, Leon
A1 - Deister, Fabian
A1 - Neumann, Hermann
A1 - Raupach, Michael J.
T1 - Cryptic species in a well-known habitat
BT - applying taxonomics to the amphipod genus Epimeria (Crustacea, Peracarida)
JF - Scientific reports
N2 - Taxonomy plays a central role in biological sciences. It provides a communication system for scientists as it aims to enable correct identification of the studied organisms. As a consequence, species descriptions should seek to include as much available information as possible at species level to follow an integrative concept of 'taxonomics'. Here, we describe the cryptic species Epimeria frankei sp. nov. from the North Sea, and also redescribe its sister species, Epimeria cornigera. The morphological information obtained is substantiated by DNA barcodes and complete nuclear 18S rRNA gene sequences. In addition, we provide, for the first time, full mitochondrial genome data as part of a metazoan species description for a holotype, as well as the neotype. This study represents the first successful implementation of the recently proposed concept of taxonomics, using data from high-throughput technologies for integrative taxonomic studies, allowing the highest level of confidence for both biodiversity and ecological research.
Y1 - 2018
U6 - https://doi.org/10.1038/s41598-018-25225-x
SN - 2045-2322
VL - 8
PB - Nature Publ. Group
CY - London
ER -
TY - JOUR
A1 - Borghini, Alessia
A1 - Ferrero, Silvio
A1 - O’Brien, Patrick J.
A1 - Laurent, Oscar
A1 - Günter, Christina
A1 - Ziemann, Martin Andreas
T1 - Cryptic metasomatic agent measured in situ in Variscan mantle rocks
BT - Melt inclusions in garnet of eclogite, Granulitgebirge, Germany
N2 - Garnet of eclogite (formerly termed garnet clinopyroxenite) hosted in lenses of orogenic garnet peridotite from the Granulitgebirge, NW Bohemian Massif, contains unique inclusions of granitic melt, now either glassy or crystallized. Analysed glasses and re‐homogenized inclusions are hydrous, peraluminous, and enriched in highly incompatible elements characteristic of the continental crust such as Cs, Li, B, Pb, Rb, Th, and U. The original melt thus represents a pristine, chemically evolved metasomatic agent, which infiltrated the mantle via deep continental subduction during the Variscan orogeny. The bulk chemical composition of the studied eclogites is similar to that of Fe‐rich basalt and the enrichment in LILE and U suggest a subduction‐related component. All these geochemical features confirm metasomatism. In comparison with many other garnet+clinopyroxene‐bearing lenses in peridotites of the Bohemian Massif, the studied samples from Rubinberg and Klatschmühle are more akin to eclogite than pyroxenites, as reflected in high jadeite content in clinopyroxene, relatively low Mg, Cr, and Ni but relatively high Ti. However, trace elements of both bulk rock and individual mineral phases show also important differences making these samples rather unique. Metasomatism involving a melt requiring a trace element pattern very similar to the composition reported here has been suggested for the source region of rocks of the so‐called durbachite suite, that is, ultrapotassic melanosyenites, which are found throughout the high‐grade Variscan basement. Moreover, the Th, U, Pb, Nb, Ta, and Ti patterns of these newly studied melt inclusions (MI) strongly resemble those observed for peridotite and its enclosed pyroxenite from the T‐7 borehole (Staré, České Středhoři Mountains) in N Bohemia. This suggests that a similar kind of crustal‐derived melt also occurred here. This study of granitic MI in eclogites from peridotites has provided the first direct characterization of a preserved metasomatic melt, possibly responsible for the metasomatism of several parts of the mantle in the Variscides.
KW - clinopyroxenite
KW - eclogite
KW - melt inclusions
KW - metasomatism
KW - orogenic peridotite
Y1 - 2019
U6 - https://doi.org/10.1111/jmg.12519
SN - 1525-1314
SN - 0263-4929
VL - 38
SP - 207
EP - 234
PB - Wiley-Blackwell
CY - Oxford [u.a.]
ER -
TY - JOUR
A1 - Dobkowitz, Sophia
A1 - Walz, Ariane
A1 - Baroni, Gabriele
A1 - Pérez-Marin, Aldrin M.
T1 - Cross-Scale Vulnerability Assessment for Smallholder Farming
BT - A Case Study from the Northeast of Brazil
JF - Sustainability
N2 - Climate change heavily impacts smallholder farming worldwide. Cross-scale vulnerability assessment has a high potential to identify nested measures for reducing vulnerability of smallholder farmers. Despite their high practical value, there are currently only limited examples of cross-scale assessments. The presented study aims at assessing the vulnerability of smallholder farmers in the Northeast of Brazil across three scales: regional, farm and field scale. In doing so, it builds on existing vulnerability indices and compares results between indices at the same scale and across scales. In total, six independent indices are tested, two at each scale. The calculated indices include social, economic and ecological indicators, based on municipal statistics, meteorological data, farm interviews and soil analyses. Subsequently, indices and overlapping indicators are normalized for intra- and cross-scale comparison. The results show considerable differences between indices across and within scales. They indicate different activities to reduce vulnerability of smallholder farmers. Major shortcomings arise from the conceptual differences between the indices. We therefore recommend the development of hierarchical indices, which are adapted to local conditions and contain more overlapping indicators for a better understanding of the nested vulnerabilities of smallholder farmers.
KW - family farming
KW - nested vulnerabilities
KW - vulnerability indices
KW - semi-arid regions
KW - Paraíba
Y1 - 2020
U6 - https://doi.org/10.3390/su12093787
SN - 2071-1050
VL - 12
IS - 9
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Wachs, Sebastian
A1 - Vazsonyi, Alexander T.
A1 - Wright, Michelle F.
A1 - Ksinan Jiskrova, Gabriela
T1 - Cross-National Associations Among Cyberbullying Victimization, Self-Esteem, and Internet Addiction
BT - Direct and Indirect Effects of Alexithymia
JF - Frontiers in Psychology
N2 - The relationship among cyberbullying victimization, lower self-esteem, and internet addiction has been well-established. Yet, little research exists that explains the nature of these associations, and no previous work has considered the inability to identify or describe one’s emotions, namely, alexithymia, as a potential mediator of these links. The present study sought to investigate the indirect effects of cyberbullying victimization on self-esteem and internet addiction, mediated by alexithymia. The sample consisted of 1,442 participants between 12 and 17 years (Mage = 14.17, SD = 1.38, 51.5% male) from Germany, the Netherlands, and the United States. Results showed a direct relationship between cyberbullying victimization and self-esteem and an indirect association mediated by alexithymia in the Dutch sample. However, in the German and U.S. samples, only an indirect relationship via alexithymia, but not a direct effect of cyberbullying victimization on self-esteem, was found. Consistent across the three country samples, cyberbullying victimization and internet addiction were directly and also indirectly associated via alexithymia. In sum, findings indicate that alexithymia might help better understand which detrimental effects cyberbullying victimization has on adolescent psychological health. Thus, cyberbullying prevention programs should consider implementing elements that educate adolescents on the ability to identify and describe their own emotions.
KW - cyberbullying victimization
KW - alexithymia
KW - self-esteem
KW - internet addiction
KW - adolescents
Y1 - 2020
U6 - https://doi.org/10.3389/fpsyg.2020.01368
SN - 1664-1078
VL - 11
PB - Frontiers Research Foundation
CY - Lausanne
ER -
TY - JOUR
A1 - Mazza, Valeria
A1 - Czyperreck, Inken
A1 - Eccard, Jana
A1 - Dammhahn, Melanie
T1 - Cross-Context Responses to Novelty in Rural and Urban Small Mammals
JF - Frontiers in Ecology and Evolution
N2 - The Anthropocene is the era of urbanization. The accelerating expansion of cities occurs at the expense of natural reservoirs of biodiversity and presents animals with challenges for which their evolutionary past might not have prepared them. Cognitive and behavioral adjustments to novelty could promote animals’ persistence under these altered conditions. We investigated the structure of, and covariance between, different aspects of responses to novelty in rural and urban small mammals of two non-commensal rodent species. We ran replicated experiments testing responses to three novelty types (object, food, or space) of 47 individual common voles (Microtus arvalis) and 41 individual striped field mice (Apodemus agrarius). We found partial support for the hypothesis that responses to novelty are structured, clustering (i) speed of responses, (ii) intensity of responses, and (iii) responses to food into separate dimensions. Rural and urban small mammals did not differ in most responses to novelty, suggesting that urban habitats do not reduce neophobia in these species. Further studies investigating whether comparable response patters are found throughout different stages of colonization, and along synurbanization processes of different duration, will help illuminate the dynamics of animals’ cognitive adjustments to urban life.
KW - animal cognition
KW - anthropogenic environment
KW - HIREC
KW - novelty
KW - neophobia
KW - neophilia
KW - rodents
KW - urbanization
Y1 - 2021
U6 - https://doi.org/10.3389/fevo.2021.661971
SN - 2296-701X
VL - 9
PB - Frontiers Media
CY - Lausanne
ER -
TY - JOUR
A1 - Kapidzic, Sanja
A1 - Frey, Felix
A1 - Neuberger, Christoph
A1 - Stieglitz, Stefan
A1 - Mirbabaie, Milad
T1 - Crisis communication on Twitter
BT - differences between user types in top tweets about the 2015 “refugee crisis” in Germany
JF - International journal of communication
N2 - The study explores differences between three user types in the top tweets about the 2015 “refugee crisis” in Germany and presents the results of a quantitative content analysis. All tweets with the keyword “Flüchtlinge” posted for a monthlong period following September 13, 2015, the day Germany decided to implement border controls, were collected (N = 763,752). The top 2,495 tweets according to number of retweets were selected for analysis. Differences between news media, public and private actor tweets in topics, tweet characteristics such as tone and opinion expression, links, and specific sentiments toward refugees were analyzed. We found strong differences between the tweets. Public actor tweets were the main source of positive sentiment toward refugees and the main information source on refugee support. News media tweets mostly reflected traditional journalistic norms of impartiality and objectivity, whereas private actor tweets were more diverse in sentiments toward refugees.
KW - refugee crisis 2015
KW - Germany
KW - social media
KW - Twitter
KW - user types
Y1 - 2023
UR - https://ijoc.org/index.php/ijoc/article/view/18172/4022
SN - 1932-8036
VL - 17
SP - 735
EP - 754
PB - The Annenberg Center for Communication
CY - Los Angeles, Calif.
ER -
TY - JOUR
A1 - Thienen, Julia von
A1 - Weinstein, Theresa Julia
A1 - Meinel, Christoph
T1 - Creative metacognition in design thinking
BT - exploring theories, educational practices, and their implications for measurement
JF - Frontiers in psychology
N2 - Design thinking is a well-established practical and educational approach to fostering high-level creativity and innovation, which has been refined since the 1950s with the participation of experts like Joy Paul Guilford and Abraham Maslow. Through real-world projects, trainees learn to optimize their creative outcomes by developing and practicing creative cognition and metacognition. This paper provides a holistic perspective on creativity, enabling the formulation of a comprehensive theoretical framework of creative metacognition. It focuses on the design thinking approach to creativity and explores the role of metacognition in four areas of creativity expertise: Products, Processes, People, and Places. The analysis includes task-outcome relationships (product metacognition), the monitoring of strategy effectiveness (process metacognition), an understanding of individual or group strengths and weaknesses (people metacognition), and an examination of the mutual impact between environments and creativity (place metacognition). It also reviews measures taken in design thinking education, including a distribution of cognition and metacognition, to support students in their development of creative mastery. On these grounds, we propose extended methods for measuring creative metacognition with the goal of enhancing comprehensive assessments of the phenomenon. Proposed methodological advancements include accuracy sub-scales, experimental tasks where examinees explore problem and solution spaces, combinations of naturalistic observations with capability testing, as well as physiological assessments as indirect measures of creative metacognition.
KW - accuracy
KW - creativity
KW - design thinking
KW - education
KW - measurement
KW - metacognition
KW - innovation
KW - framework
Y1 - 2023
U6 - https://doi.org/10.3389/fpsyg.2023.1157001
SN - 1664-1078
VL - 14
PB - Frontiers Research Foundation
CY - Lausanne
ER -
TY - JOUR
A1 - Schoonover, Heather A.
A1 - Gret-Regamey, Adrienne
A1 - Metzger, Marc J.
A1 - Ruiz-Frau, Ana
A1 - Santos-Reis, Margarida
A1 - Scholte, Samantha S. K.
A1 - Walz, Ariane
A1 - Nicholas, Kimberly A.
T1 - Creating space, aligning motivations, and building trust
BT - a practical framework for stakeholder engagement based on experience in 12 ecosystem services case studies
JF - Ecology and society : a journal of integrative science for resilience and sustainability
N2 - Ecosystem services inherently involve people, whose values help define the benefits of nature's services. It is thus important for researchers to involve stakeholders in ecosystem services research. However, a simple and practicable framework to guide such engagement, and in particular to help researchers anticipate and consider key issues and challenges, has not been well explored. Here, we use experience from the 12 case studies in the European Operational Potential of Ecosystem Research Applications (OPERAs) project to propose a stakeholder engagement framework comprising three key elements: creating space, aligning motivations, and building trust. We argue that involving stakeholders in research demands thoughtful reflection from the researchers about what kind of space they want to create, including if and how they want to bring different interests together, how much space they want to allow for critical discussion, and whether there is a role for particular stakeholders to serve as conduits between others. In addition, understanding their own motivations—including values, knowledge, goals, and desired benefits—will help researchers decide when and how to involve stakeholders, identify areas of common ground and potential disagreement, frame the project appropriately, set expectations, and ensure each party is able to see benefits of engaging with each other. Finally, building relationships with stakeholders can be difficult but considering the roles of existing relationships, time, approach, reputation, and belonging can help build mutual trust. Although the three key elements and the paths between them can play out differently depending on the particular research project, we suggest that a research design that considers how to create the space in which researchers and stakeholders will meet, align motivations between researchers and stakeholders, and build mutual trust will help foster productive researcher–stakeholder relationships.
KW - cocreated knowledge
KW - ecosystem services
KW - participatory research
KW - research design
KW - stakeholder engagement
KW - transdisciplinary research
Y1 - 2019
U6 - https://doi.org/10.5751/ES-10061-240111
SN - 1708-3087
VL - 24
IS - 1
PB - Resilience Alliance
CY - Wolfville
ER -
TY - JOUR
A1 - Teich, Paula
A1 - Fühner, Thea Heidi
A1 - Baehr, Florian
A1 - Puta, Christian
A1 - Granacher, Urs
A1 - Kliegl, Reinhold
T1 - Covid pandemic effects on the physical fitness of primary school children
BT - results of the german EMOTIKON project
JF - Sports Medicine - Open
N2 - BackgroundIn spring of 2020, the Sars-CoV-2 incidence rate increased rapidly in Germany and around the world. Throughout the next 2 years, schools were temporarily closed and social distancing measures were put in place to slow the spread of the Covid-19 virus. Did these social restrictions and temporary school lockdowns affect children's physical fitness? The EMOTIKON project annually tests the physical fitness of all third-graders in the Federal State of Brandenburg, Germany. The tests assess cardiorespiratory endurance (6-min-run test), coordination (star-run test), speed (20-m sprint test), lower (powerLOW, standing long jump test), and upper (powerUP, ball-push test) limbs muscle power, and static balance (one-legged stance test with eyes closed). A total of 125,893 children were tested in the falls from 2016 to 2022. Primary analyses focused on 98,510 keyage third-graders (i.e., school enrollment according to the legal key date, aged 8 to 9 years) from 515 schools. Secondary analyses included 27,383 older-than-keyage third-graders (i.e., OTK, delayed school enrollment or repetition of a grade, aged 9 to 10 years), who have been shown to exhibit lower physical fitness than expected for their age. Linear mixed models fitted pre-pandemic quadratic secular trends, and took into account differences between children and schools.ResultsThird-graders exhibited lower cardiorespiratory endurance, coordination, speed and powerUP in the Covid pandemic cohorts (2020-2022) compared to the pre-pandemic cohorts (2016-2019). Children's powerLOW and static balance were higher in the pandemic cohorts compared to the pre-pandemic cohorts. From 2020 to 2021, coordination, powerLOW and powerUP further declined. Evidence for some post-pandemic physical fitness catch-up was restricted to powerUP. Cohen's |ds| for comparisons of the pandemic cohorts 2020-2022 with pre-pandemic cohorts 2016-2019 ranged from 0.02 for powerLOW to 0.15 for coordination. Within the pandemic cohorts, keyage children exhibited developmental losses ranging from approximately 1 month for speed to 5 months for cardiorespiratory endurance. For powerLOW and static balance, the positive pandemic effects translate to developmental gains of 1 and 7 months, respectively. Pre-pandemic secular trends may account for some of the observed differences between pandemic and pre-pandemic cohorts, especially in powerLOW, powerUP and static balance. The pandemic further increased developmental delays of OTK children in cardiorespiratory endurance, powerUP and balance.ConclusionsThe Covid-19 pandemic was associated with declines in several physical fitness components in German third-graders. Pandemic effects are still visible in 2022. Health-related interventions should specifically target those physical fitness components that were negatively affected by the pandemic (cardiorespiratory endurance, coordination, speed).
KW - Sars-CoV-2
KW - Cohort study
KW - Cardiorespiratory endurance
KW - Muscle power
KW - Physical fitness
KW - Youth
KW - EMOTIKON
KW - Linear mixed models
Y1 - 2023
U6 - https://doi.org/10.1186/s40798-023-00624-1
SN - 2198-9761
VL - 9
IS - 1
PB - Springer
CY - New York
ER -
TY - JOUR
A1 - Bögelein, Nicole
A1 - Eppert, Kerstin
A1 - Roth, Viktoria
A1 - Schmidt-Kleinert, Anja
T1 - Courtroom ethnography in the context of terrorism
BT - a multi-level approach
JF - International journal of qualitative methods : IJQM
N2 - This paper addresses terrorism trials as sites of research and proposes an approach for the analysis of ethnographic data collected during these trials. The suggested approach offers multi-level analytical access, it centers around interactionist conceptions and knowledge discourses. The conceptual framework we suggest is spelled out in terms of how to observe and being sensitive of (re-)production of power structures inside the courtroom as well as in regard to relations imported into the courtroom. For this purpose, we integrate (i) the micro-level of courtroom interactions and (ii) (self-)presentation, (iii) the meso-level of knowledge (re)production and the establishment of knowledge orders and (iv) an intersectional perspective on gender, race, and class in knowledge discourses. By applying a multi-level approach, we open up new explanatory avenues to understand the constitution of terrorism as a socio-legal object. The methodical framework connects hitherto unconnected elements, that is, participants' interactions and negotiation, their (self-)representations, ascriptions and narrative performances, and knowledge (re-)production in order to establish or maintain political and social orders.
KW - trials
KW - terrorism
KW - radicalisation
KW - extremism
KW - courtroom
KW - ethnography;
KW - methodology
KW - interactionist
KW - knowledge discourse
Y1 - 2022
U6 - https://doi.org/10.1177/16094069221090059
SN - 1609-4069
VL - 21
PB - Sage Publishing
CY - Thousand Oaks
ER -
TY - JOUR
A1 - Bereswill, Sarah
A1 - Gatz-Miller, Hannah
A1 - Su, Danyang
A1 - Tötzke, Christian
A1 - Kardjilov, Nikolay
A1 - Oswald, Sascha
A1 - Mayer, Klaus Ulrich
T1 - Coupling non-invasive imaging and reactive transport modeling to investigate water and oxygen dynamics in the root zone
JF - Vadose zone journal
N2 - Oxygen (O-2) availability in soils is vital for plant growth and productivity. The transport and consumption of O-2 in the root zone is closely linked to soil moisture content, the spatial distribution of roots, as well as structure and heterogeneity of the surrounding soil. In this study, we measure three-dimensional root system architecture and the spatiotemporal dynamics of soil moisture (& theta;) and O-2 concentrations in the root zone of maize (Zea mays) via non-invasive imaging, and then construct and parameterize a reactive transport model based on the experimental data. The combination of three non-invasive imaging methods allowed for a direct comparison of simulation results with observations at high spatial and temporal resolution. In three different modeling scenarios, we investigated how the results obtained for different levels of conceptual complexity in the model were able to match measured & theta; and O-2 concentration patterns. We found that the modeling scenario that considers heterogeneous soil structure and spatial variability of hydraulic parameters (permeability, porosity, and van Genuchten & alpha; and n), better reproduced the measured & theta; and O-2 patterns relative to a simple model with a homogenous soil domain. The results from our combined imaging and modeling analysis reveal that experimental O-2 and water dynamics can be reproduced quantitatively in a reactive transport model, and that O-2 and water dynamics are best characterized when conditions unique to the specific system beyond the distribution of roots, such as soil structure and its effect on water saturation and macroscopic gas transport pathways, are considered.
Y1 - 2023
U6 - https://doi.org/10.1002/vzj2.20268
SN - 1539-1663
VL - 22
IS - 5
PB - Wiley
CY - Hoboken
ER -
TY - JOUR
A1 - Kreuzer, Moritz
A1 - Reese, Ronja
A1 - Huiskamp, Willem Nicholas
A1 - Petri, Stefan
A1 - Albrecht, Torsten
A1 - Feulner, Georg
A1 - Winkelmann, Ricarda
T1 - Coupling framework (1.0) for the PISM (1.1.4) ice sheet model and the MOMS (5.1.0) ocean model via the PICO ice shelf cavity model in an Antarctic domain
JF - Geoscientific model development : an interactive open access journal of the European Geosciences Union
N2 - The past and future evolution of the Antarctic Ice Sheet is largely controlled by interactions between the ocean and floating ice shelves. To investigate these interactions, coupled ocean and ice sheet model configurations are required. Previous modelling studies have mostly relied on high-resolution configurations, limiting these studies to individual glaciers or regions over short timescales of decades to a few centuries. We present a framework to couple the dynamic ice sheet model PISM (Parallel Ice Sheet Model) with the global ocean general circulation model MOM5 (Modular Ocean Model) via the ice shelf cavity model PICO (Pots-dam Ice-shelf Cavity mOdel). As ice shelf cavities are not resolved by MOM5 but are parameterized with the PICO box model, the framework allows the ice sheet and ocean components to be run at resolutions of 16 km and 3 degrees respectively. This approach makes the coupled configuration a useful tool for the analysis of interactions between the Antarctic Ice Sheet and the global ocean over time spans of the order of centuries to millennia. In this study, we describe the technical implementation of this coupling framework: sub-shelf melting in the ice sheet component is calculated by PICO from modelled ocean temperatures and salinities at the depth of the continental shelf, and, vice versa, the resulting mass and energy fluxes from melting at the ice-ocean interface are transferred to the ocean component. Mass and energy fluxes are shown to be conserved to machine precision across the considered component domains. The implementation is computationally efficient as it introduces only minimal overhead. Furthermore, the coupled model is evaluated in a 4000 year simulation under constant present-day climate forcing and is found to be stable with respect to the ocean and ice sheet spin-up states. The framework deals with heterogeneous spatial grid geometries, varying grid resolutions, and timescales between the ice and ocean component in a generic way; thus, it can be adopted to a wide range of model set-ups.
Y1 - 2021
U6 - https://doi.org/10.5194/gmd-14-3697-2021
SN - 1991-959X
SN - 1991-9603
VL - 14
IS - 6
SP - 3697
EP - 3714
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Shi, Jun
A1 - Joshi, Jasmin Radha
A1 - Tielboerger, Katja
A1 - Verhoeven, Koen J. F.
A1 - Macel, Mirka
T1 - Costs and benefits of admixture between foreign genotypes and local populations in the field
JF - Ecology and evolution
N2 - Admixture is the hybridization between populations within one species. It can increase plant fitness and population viability by alleviating inbreeding depression and increasing genetic diversity. However, populations are often adapted to their local environments and admixture with distant populations could break down local adaptation by diluting the locally adapted genomes. Thus, admixed genotypes might be selected against and be outcompeted by locally adapted genotypes in the local environments. To investigate the costs and benefits of admixture, we compared the performance of admixed and within-population F1 and F2 generations of the European plant Lythrum salicaria in a reciprocal transplant experiment at three European field sites over a 2-year period. Despite strong differences between site and plant populations for most of the measured traits, including herbivory, we found limited evidence for local adaptation. The effects of admixture depended on experimental site and plant population, and were positive for some traits. Plant growth and fruit production of some populations increased in admixed offspring and this was strongest with larger parental distances. These effects were only detected in two of our three sites. Our results show that, in the absence of local adaptation, admixture may boost plant performance, and that this is particularly apparent in stressful environments. We suggest that admixture between foreign and local genotypes can potentially be considered in nature conservation to restore populations and/or increase population viability, especially in small inbred or maladapted populations.
KW - heterosis
KW - inbreeding depression
KW - local adaptation
KW - Lythrum salicaria
KW - outbreeding depression
Y1 - 2018
U6 - https://doi.org/10.1002/ece3.3946
SN - 2045-7758
VL - 8
IS - 7
SP - 3675
EP - 3684
PB - Wiley
CY - Hoboken
ER -
TY - JOUR
A1 - Saha, Sourav
A1 - Owen, Lewis A.
A1 - Orr, Elizabeth N.
A1 - Caffee, Marc W.
T1 - Cosmogenic Be-10 and equilibrium-line altitude dataset of Holocene glacier advances in the Himalayan-Tibetan orogen
JF - Data in brief
N2 - A comprehensive analysis of the variable temporal and spatial responses of tropical-subtropical high-altitude glaciers to climate change is critical for successful model predictions and environmental risk assessment in the Himalayan-Tibetan orogen. High-frequency Holocene glacier chronostratigraphies are therefore reconstructed in 79 glaciated valleys across the orogen using 519 published and 16 new terrestrial cosmogenic 10Be exposure age dataset. Published 10Be ages are compiled only for moraine boulders (excluding bedrock ages). These ages are recalculated using the latest ICE-D production rate calibration database and the scaling scheme models. Outliers for the individual moraine are detected using the Chauvenet's criterion. In addition, past equilibrium-line altitudes (ELAs) are determined using the area-altitude (AA), area accumulation ratio (AAR), and toe-headwall accumulation ratio (THAR) methods for each glacier advance. The modern maximum elevations of lateral moraines (MELM) are also used to estimate modern ELAs and as an independent check on mean ELAs derived using the above three methods. These data may serve as an essential archive for future studies focusing on the cryospheric and environmental changes in the Himalayan-Tibetan orogen. A more comprehensive analysis of the published and new 10Be ages and ELA results and a list of references are presented in Saha et al. (2019, High-frequency Holocene glacier fluctuations in the Himalayan-Tibetan orogen. Quaternary Science Reviews, 220, 372–400).
KW - Cosmogenic nuclides
KW - Equilibrium-line altitudes
KW - Holocene
KW - Central asia
KW - Glaciation
Y1 - 2019
U6 - https://doi.org/10.1016/j.dib.2019.104412
SN - 2352-3409
VL - 26
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Maiti, Snehanshu
A1 - Makwana, Kirit
A1 - Zhang, Heshou
A1 - Yan, Huirong
T1 - Cosmic-ray transport in magnetohydrodynamic turbulence
JF - The astrophysical journal : an international review of spectroscopy and astronomical physics / part 1
N2 - This paper studies cosmic-ray (CR) transport in magnetohydrodynamic (MHD) turbulence. CR transport is strongly dependent on the properties of the magnetic turbulence.
We perform test particle simulations to study the interactions of CR with both total MHD turbulence and decomposed MHD modes.
The spatial diffusion coefficients and the pitch angle scattering diffusion coefficients are calculated from the test particle trajectories in turbulence.
Our results confirm that the fast modes dominate the CR propagation, whereas Alfven and slow modes are much less efficient and have shown similar pitch-angle scattering rates.
We investigate the cross field transport on large and small scales. On large/global scales, normal diffusion is observed and the diffusion coefficient is suppressed by M-A(zeta) compared to the parallel diffusion coefficients, with zeta closer to 4 in Alfven modes than that in total turbulence, as theoretically expected.
For the CR transport on scales smaller than the turbulence injection scale, both the local and global magnetic reference frames are adopted. Superdiffusion is observed on such small scales in all the cases. Particularly, CR transport in Alfven modes show clear Richardson diffusion in the local reference frame. The diffusion transitions smoothly from the Richardson's one with index 1.5 to normal diffusion as the particle mean free path decreases from lambda(parallel to) >> L to lambda(parallel to) << L, where L is the injection/coherence length of turbulence.
Our results have broad applications to CRs in various astrophysical environments.
Y1 - 2022
U6 - https://doi.org/10.3847/1538-4357/ac46c8
SN - 1538-4357
VL - 926
IS - 1
PB - Institute of Physics Publ.
CY - London
ER -
TY - JOUR
A1 - Witzel, Katja
A1 - Abu Risha, Marua
A1 - Albers, Philip
A1 - Börnke, Frederik
A1 - Hanschen, Franziska S.
T1 - Corrigendum : Identification and characterization of three epithiospecifier protein isoforms in Brassica oleracea / Witzel, Katja; Abu Risha, Marua; Albers, Philip; Börnke, Frederike; Hanschen, Franziska S. - Lausanne: Frontiers Media, 2019. - Frontiers in plant science : FPLS. - 10 (2019) art. 1552. - doi: 10.3389/fpls.2019.01552
JF - Frontiers in plant science : FPLS
KW - epithionitrile
KW - expression profile
KW - functional complementation
KW - glucosinolate hydrolysis
KW - nitrile
KW - specifier proteins
KW - tissue
KW - specificity
Y1 - 2020
U6 - https://doi.org/10.3389/fpls.2020.00523
SN - 1664-462X
VL - 11
PB - Frontiers Media
CY - Lausanne
ER -
TY - JOUR
A1 - Felser, Claudia
A1 - Jessen, Anna
T1 - Correlative coordination and variable subject-verb agreement in German
JF - Languages : open access journal
N2 - Coordinated subjects often show variable number agreement with the finite verb, but linguistic approaches to this phenomenon have rarely been informed by systematically collected data. We report the results from three experiments investigating German speakers' agreement preferences with complex subjects joined by the correlative conjunctions sowohl horizontal ellipsis als auch ('both horizontal ellipsis and'), weder horizontal ellipsis noch ('neither horizontal ellipsis nor') or entweder horizontal ellipsis oder ('either horizontal ellipsis or'). We examine to what extent conjunction type and a conjunct's relative proximity to the verb affect the acceptability and processibility of singular vs. plural agreement. Experiment 1 was an untimed acceptability rating task, Experiment 2 a timed sentence completion task, and Experiment 3 was a self-paced reading task. Taken together, our results show that number agreement with correlative coordination in German is primarily determined by a default constraint triggering plural agreement, which interacts with linear order and semantic factors. Semantic differences between conjunctions only affected speakers' agreement preferences in the absence of processing pressure but not their initial agreement computation. The combined results from our offline and online experimental measures of German speakers' agreement preferences suggest that the constraints under investigation do not only differ in their relative weighting but also in their relative timing during agreement computation.
KW - correlative coordination
KW - subject– verb agreement
KW - German
Y1 - 2021
U6 - https://doi.org/10.3390/languages6020067
SN - 2226-471X
VL - 6
IS - 2
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Bosch, Sina
A1 - De Cesare, Ilaria
A1 - Demske, Ulrike
A1 - Felser, Claudia
T1 - Correction zu: Word-order variation and coherence in German infinitival complementation. - (The journal of comparative Germanic linguistics. - 26 (2023) 1) . - https://doi.org/10.1007/s10828-023-09140-8
JF - The journal of comparative Germanic linguistics
Y1 - 2023
U6 - https://doi.org/10.1007/s10828-023-09143-5
SN - 1383-4924
SN - 1572-8552
VL - 26
IS - 1
PB - Springer
CY - New York
ER -
TY - JOUR
A1 - Semke, Lisa-Marie
A1 - Tiberius, Victor
T1 - Corporate Foresight and Dynamic Capabilities
BT - An Exploratory Study
JF - Forecasting
N2 - Firms engage in forecasting and foresight activities to predict the future or explore possible future states of the business environment in order to pre-empt and shape it (corporate foresight). Similarly, the dynamic capabilities approach addresses relevant firm capabilities to adapt to fast change in an environment that threatens a firm’s competitiveness and survival. However, despite these conceptual similarities, their relationship remains opaque. To close this gap, we conduct qualitative interviews with foresight experts as an exploratory study. Our results show that foresight and dynamic capabilities aim at an organizational renewal to meet future challenges. Foresight can be regarded as a specific activity that corresponds with the sensing process of dynamic capabilities. The experts disagree about the relationship between foresight and sensing and see no direct links with transformation. However, foresight can better inform post-sensing activities and, therefore, indirectly contribute to the adequate reconfiguration of the resource base, an increased innovativeness, and firm performance.
KW - corporate foresight
KW - dynamic capabilities
KW - forecasting
KW - Germany
Y1 - 2020
U6 - https://doi.org/10.3390/forecast2020010
SN - 2571-9394
VL - 2
IS - 2
SP - 180
EP - 293
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Kruggel, Alexander
A1 - Tiberius, Victor
A1 - Fabro, Manuela
T1 - Corporate Citizenship
BT - Structuring the Research Field
JF - Sustainability
N2 - Corporate citizenship, which is firms’ societal engagement beyond customer and shareholder interests, is a prominent topic in management practice and has led to extensive research. This increased interest resulted in a complex and fragmented scholarly literature. In order to structure and map the field quantitatively, we conducted a temporal analysis of publications and citations, an analysis of the productivity of involved disciplines, an analysis of the productivity of publication forms including journal impact factors, an author productivity and citation analysis, a co-author analysis, an article citation analysis, an article co-citation analysis, and a keyword co-occurrence analysis. Results of these bibliometric analyses show that corporate citizenship research seems to have been in a phase of stagnation since 2014 and shows a rather low degree of interdisciplinarity. Papers are predominantly published in high impact journals. Authors show little collaboration with other researchers. Current research relates to other business ethics topics, addresses philosophical foundations, and starts to relate to human resource management and organization studies.
KW - bibliometric analysis
KW - corporate citizenship
KW - corporate social responsibility
KW - CSR
Y1 - 2020
U6 - https://doi.org/10.3390/su12135289
SN - 2071-1050
VL - 12
IS - 13
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Vinke, Kira
A1 - Gabrysch, Sabine
A1 - Paoletti, Emanuela
A1 - Rockström, Johan
A1 - Schellnhuber, Hans Joachim
T1 - Corona and the climate
BT - a comparison of two emergencies
JF - Global sustainability
N2 - Lessons from the corona crisis can help manage the even more daunting challenge of anthropogenic global warming.
KW - adaptation and mitigation
KW - ecology and biodiversity
KW - human behaviour
KW - natural resources (biological and non-biological)
KW - policies
KW - politics
KW - and governance
Y1 - 2020
U6 - https://doi.org/10.1017/sus.2020.20
SN - 2059-4798
VL - 3
PB - Cambridge Univ. Press
CY - Cambridge
ER -
TY - JOUR
A1 - Lever, Fabiano
A1 - Mayer, Dennis
A1 - Metje, Jan
A1 - Alisauskas, Skirmantas
A1 - Calegari, Francesca
A1 - Düsterer, Stefan
A1 - Feifel, Raimund
A1 - Niebuhr, Mario
A1 - Manschwetus, Bastian
A1 - Kuhlmann, Marion
A1 - Mazza, Tommaso
A1 - Robinson, Matthew Scott
A1 - Squibb, Richard J.
A1 - Trabattoni, Andrea
A1 - Wallner, Måns
A1 - Wolf, Thomas J. A.
A1 - Gühr, Markus
T1 - Core-level spectroscopy of 2-thiouracil at the sulfur L1 and L2,3 edges utilizing a SASE free-electron-laser
JF - Molecules
N2 - In this paper, we report X-ray absorption and core-level electron spectra of the nucleobase derivative 2-thiouracil at the sulfur L1- and L2,3-edges. We used soft X-rays from the free-electron laser FLASH2 for the excitation of isolated molecules and dispersed the outgoing electrons with a magnetic bottle spectrometer. We identified photoelectrons from the 2p core orbital, accompanied by an electron correlation satellite, as well as resonant and non-resonant Coster–Kronig and Auger–Meitner emission at the L1- and L2,3-edges, respectively. We used the electron yield to construct X-ray absorption spectra at the two edges. The experimental data obtained are put in the context of the literature currently available on sulfur core-level and 2-thiouracil spectroscopy.
KW - X-ray
KW - photoelectron
KW - sulfur
KW - thiouracil
KW - nucleobases
KW - Coster–Kronig
KW - Auger–Meitner
KW - NEXAFS
KW - FLASH
Y1 - 2021
SN - 1420-3049
VL - 26
IS - 21
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Lu, Yong-Ping
A1 - Reichetzeder, Christoph
A1 - Prehn, Cornelia
A1 - Yin, Liang-Hong
A1 - Yun, Chen
A1 - Zeng, Shufei
A1 - Chu, Chang
A1 - Adamski, Jerzy
A1 - Hocher, Berthold
T1 - Cord blood Lysophosphatidylcholine 16:1 is positively associated with birth weight
JF - Cellular physiology and biochemistry : international journal of experimental cellular physiology, biochemistry and pharmacology
N2 - Background/Aims: Impaired birth outcomes, like low birth weight, have consistently been associated with increased disease susceptibility to hypertension in later life. Alterations in the maternal or fetal metabolism might impact on fetal growth and influence birth outcomes. Discerning associations between the maternal and fetal metabolome and surrogate parameters of fetal growth could give new insight into the complex relationship between intrauterine conditions, birth outcomes, and later life disease susceptibility. Methods: Using flow injection tandem mass spectrometry, targeted metabolomics was performed in serum samples obtained from 226 mother/child pairs at delivery. Associations between neonatal birth weight and concentrations of 163 maternal and fetal metabolites were analyzed. Results: After FDR adjustment using the Benjamini-Hochberg procedure lysophosphatidylcholines (LPC) 14:0, 16:1, and 18:1 were strongly positively correlated with birth weight. In a stepwise linear regression model corrected for established confounding factors of birth weight, LPC 16: 1 showed the strongest independent association with birth weight (CI: 93.63 - 168.94; P = 6.94x10(-11)). The association with birth weight was stronger than classical confounding factors such as offspring sex (CI: - 258.81- -61.32; P = 0.002) and maternal smoking during pregnancy (CI: -298.74 - -29.51; P = 0.017). Conclusions: After correction for multiple testing and adjustment for potential confounders, LPC 16:1 showed a very strong and independent association with birth weight. The underlying molecular mechanisms linking fetal LPCs with birth weight need to be addressed in future studies. (c) 2018 The Author(s) Published by S. Karger AG, Basel
KW - Metabolomics
KW - Lysophosphatidylcholine
KW - Birth Weight
KW - DOHaD
KW - Hypertension
KW - Type 2 Diabetes
Y1 - 2018
U6 - https://doi.org/10.1159/000487118
SN - 1015-8987
SN - 1421-9778
VL - 45
IS - 2
SP - 614
EP - 624
PB - Karger
CY - Basel
ER -
TY - JOUR
A1 - Wright, Michelle F.
A1 - Wachs, Sebastian
A1 - Yanagida, Takuya
A1 - Sevcikova, Anna
A1 - Dedkova, Lenka
A1 - Bayraktar, Fatih
A1 - Aoyama, Ikuko
A1 - Kamble, Shanmukh
A1 - Macháčková, Hana
A1 - Li, Zheng
A1 - Soudi, Shruti
A1 - Lei, Li
A1 - Shu, Chang
T1 - Coping with Public and Private Face-to-Face and Cyber Victimization among Adolescents in Six Countries
BT - roles of Severity and Country
JF - International journal of environmental research and public health
N2 - This study investigated the role of medium (face-to-face, cyber) and publicity (public, private) in adolescents' perceptions of severity and coping strategies (i.e., avoidant, ignoring, helplessness, social support seeking, retaliation) for victimization, while accounting for gender and cultural values. There were 3432 adolescents (ages 11-15, 49% girls) in this study; they were from China, Cyprus, the Czech Republic, India, Japan, and the United States. Adolescents completed questionnaires on individualism and collectivism, and ratings of coping strategies and severity for public face-to-face victimization, private face-to-face victimization, public cyber victimization, and private cyber victimization. Findings revealed similarities in adolescents' coping strategies based on perceptions of severity, publicity, and medium for some coping strategies (i.e., social support seeking, retaliation) but differential associations for other coping strategies (i.e., avoidance, helplessness, ignoring). The results of this study are important for prevention and intervention efforts because they underscore the importance of teaching effective coping strategies to adolescents, and to consider how perceptions of severity, publicity, and medium might influence the implementation of these coping strategies.
KW - coping
KW - country
KW - culture
KW - victimization
KW - severity
KW - cyberbullying
KW - bullying
Y1 - 2022
U6 - https://doi.org/10.3390/ijerph192114405
SN - 1661-7827
SN - 1660-4601
VL - 19
IS - 21
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Wendt, Martin
A1 - Senftleben, Nele
A1 - Gros, Patrick
A1 - Schmitt, Thomas
T1 - Coping with environmental extremes
BT - population ecology and behavioural adaptation of Erebia pronoe, an Alpine butterfly species
JF - Insects : open access journal
N2 - Simple Summary:& nbsp;High alpine meadows are home to numerous endemic butterfly species. A combination of climate change and changes in agricultural practices has led to a severe decline in many species. A seemingly unaffected representative of this habitat is Erebia pronoe. We studied the behaviour, resource use and population structure of this species to explain its resilience and estimate its future survival potential. This species shows pronounced protandry in combination with serial eclosion. Males were significantly more active and mobile and were also caught significantly more often than females, resulting in a pronounced shift in sex ratio in the predicted population structure. The adults use a wide range of nectar plants and establish homeranges in areas of high habitat quality. Thus, Erebia pronoe adults use a wide array of resources combined with a slight specialisation to avoid niche overlap with closely related species. The resulting ecological flexibility seems to be an adaptation to unpredictable environmental conditions, which should be the result of a long-lasting adaptation process. Moreover, the combination of opportunism and modest specialisation should also be a good basis for coping with future changes caused by climate and land-use change.
A mark-recapture study of the nominotypical Erebia pronoe in the Alps was conducted to survey its ecological demands and characteristics. Population structure analysis revealed a combination of protandry (one-week earlier eclosion of males) and serial eclosion. Significant differences between both sexes were found in population density (males: 580/ha & PLUSMN; 37 SE; females: 241/ha & PLUSMN; 66 SE), sex-ratio (2.4) and behaviour (57.7 vs. 11.9% flying). Both sexes used a wide range of nectar plants (Asteraceae, 77.3%; Dipsacaceae, 12.3%; Gentianaceae, 9.7%). The use of nectar plants shows a non-specific spectrum, which, however, completely avoids overlap with the locally co-occurring species Erebia nivalis. Movement patterns show the establishment of homeranges, which significantly limits the migration potential. Due to its broad ecological niche, E. pronoe will probably be able to react plastically to the consequences of climate change. The formation of high population densities, the unconcerned endangerment status, the unspecific resource spectrum and the sedentary character of the species make E. pronoe a potential indicator of the quality and general resource occurrence of alpine rupicolous grasslands.
KW - mark-release-recapture
KW - movement patterns
KW - opportunistic behaviour
KW - partial protandry
KW - population demography
Y1 - 2021
U6 - https://doi.org/10.3390/insects12100896
SN - 2075-4450
VL - 12
IS - 10
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Bouchoule, Isabelle
A1 - Schemmer, Max
A1 - Henkel, Carsten
T1 - Cooling phonon modes of a Bose condensate with uniform few body losses
JF - Scipost Physics
N2 - We present a general analysis of the cooling produced by losses on condensates or quasi-condensates. We study how the occupations of the collective phonon modes evolve in time, assuming that the loss process is slow enough so that each mode adiabatically follows the decrease of the mean density. The theory is valid for any loss process whose rate is proportional to the jth power of the density, but otherwise spatially uniform. We cover both homogeneous gases and systems confined in a smooth potential. For a low-dimensional gas, we can take into account the modified equation of state due to the broadening of the cloud width along the tightly confined directions, which occurs for large interactions. We find that at large times, the temperature decreases proportionally to the energy scale mc(2), where m is the mass of the particles and c the sound velocity. We compute the asymptotic ratio of these two quantities for different limiting cases: a homogeneous gas in any dimension and a one-dimensional gas in a harmonic trap.
Y1 - 2018
U6 - https://doi.org/10.21468/SciPostPhys.5.5.043
SN - 2542-4653
VL - 5
IS - 5
PB - Scipost foundation
CY - Amsterdam
ER -
TY - JOUR
A1 - Pornsawad, Pornsarp
A1 - Sungcharoen, Parada
A1 - Böckmann, Christine
T1 - Convergence rate of the modified Landweber method for solving inverse potential problems
JF - Mathematics : open access journal
N2 - In this paper, we present the convergence rate analysis of the modified Landweber method under logarithmic source condition for nonlinear ill-posed problems. The regularization parameter is chosen according to the discrepancy principle. The reconstructions of the shape of an unknown domain for an inverse potential problem by using the modified Landweber method are exhibited.
KW - nonlinear operator
KW - regularization
KW - modified Landweber method
KW - discrepancy principle
KW - logarithmic source condition
Y1 - 2020
U6 - https://doi.org/10.3390/math8040608
SN - 2227-7390
VL - 8
IS - 4
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Chen, Xinwei
A1 - Chen, Hanlin
A1 - Sobel, Edward
A1 - Lin, Xiubin
A1 - Cheng, Xiaogan
A1 - Yan, Jiakai
A1 - Yang, Shaomei
T1 - Convergence of the Pamir and the South Tian Shan in the late Cenozoic
BT - Insights from provenance analysis in the Wuheshalu section at the convergence area
JF - Lithosphere
N2 - In response to collision and convergence between India and Asia during the Cenozoic, convergence took place between the Pamir and South Tian Shan. Here we present new detrital zircon U-Pb ages coupled with conglomerate clast counting and sedimentary data from the late Cenozoic Wuheshalu section in the convergence zone, to shed light on the convergence process of the Pamir and South Tian Shan. Large Triassic zircon U-Pb age populations in all seven samples suggest that Triassic igneous rocks from the North Pamir were the major source area for the late Cenozoic Wuheshalu section. In the Miocene, large populations of the North Pamir component supports rapid exhumation in the North Pamir and suggest that topography already existed there since the early Miocene. Exhumation of the South Tian Shan was relatively less important in the Miocene and its detritus could only reach a limited area in the foreland area. Gradually increasing sediment loading and convergence of the Pamir and South Tian Shan caused rapid subsidence in the convergence area. Since ca. 6-5.3 Ma, the combination of a major North Pamir component and a minor South Tian Shan component at the Wuheshalu section is consistent with active deformation of the South Tian Shan and the North Pamir. During deposition of the upper Atushi Formation, a larger proportion of North Pamir-derived sediments was deposited in the Wuheshalu section, maybe because faulting and northward propagation of the North Pamir caused northward displacement of the depocenter to north of the Wuheshalu section.
Y1 - 2019
U6 - https://doi.org/10.1130/L1028.1
SN - 1941-8264
SN - 1947-4253
VL - 11
IS - 4
SP - 507
EP - 523
PB - American Institute of Physics
CY - Boulder
ER -
TY - JOUR
A1 - Rodriguez Piceda, Constanza
A1 - Scheck-Wenderoth, Magdalena
A1 - Bott, Judith
A1 - Gomez Dacal, Maria Laura
A1 - Cacace, Mauro
A1 - Pons, Michael
A1 - Prezzi, Claudia
A1 - Strecker, Manfred
T1 - Controls of the Lithospheric Thermal Field of an Ocean-Continent Subduction Zone
BT - the Southern Central Andes
JF - Lithosphere / Geological Society of America
N2 - In an ocean-continent subduction zone, the assessment of the lithospheric thermal state is essential to determine the controls of the deformation within the upper plate and the dip angle of the subducting lithosphere. In this study, we evaluate the degree of influence of both the configuration of the upper plate (i.e., thickness and composition of the rock units) and variations of the subduction angle on the lithospheric thermal field of the southern Central Andes (29 degrees-39 degrees S). Here, the subduction angle increases from subhorizontal (5 degrees) north of 33 degrees S to steep (similar to 30 degrees) in the south. We derived the 3D temperature and heat flow distribution of the lithosphere in the southern Central Andes considering conversion of S wave tomography to temperatures together with steady-state conductive thermal modeling. We found that the orogen is overall warmer than the forearc and the foreland and that the lithosphere of the northern part of the foreland appears colder than its southern counterpart. Sedimentary blanketing and the thickness of the radiogenic crust exert the main control on the shallow thermal field (<50km depth). Specific conditions are present where the oceanic slab is relatively shallow (<85 km depth) and the radiogenic crust is thin. This configuration results in relatively colder temperatures compared to regions where the radiogenic crust is thick and the slab is steep. At depths >50km, the temperatures of the overriding plate are mainly controlled by the mantle heat input and the subduction angle. The thermal field of the upper plate likely preserves the flat subduction angle and influences the spatial distribution of shortening.
Y1 - 2022
U6 - https://doi.org/10.2113/2022/2237272
SN - 1941-8264
SN - 1947-4253
VL - 2022
IS - 1
PB - GeoScienceWorld
CY - McLean
ER -
TY - JOUR
A1 - Fischer, Melanie
A1 - Korup, Oliver
A1 - Veh, Georg
A1 - Walz, Ariane
T1 - Controls of outbursts of moraine-dammed lakes in the greater Himalayan region
JF - The Cryosphere
N2 - Glacial lakes in the Hindu Kush–Karakoram–Himalayas–Nyainqentanglha (HKKHN) region have grown rapidly in number and area in past decades, and some dozens have drained in catastrophic glacial lake outburst floods (GLOFs). Estimating regional susceptibility of glacial lakes has largely relied on qualitative assessments by experts, thus motivating a more systematic and quantitative appraisal. Before the backdrop of current climate-change projections and the potential of elevation-dependent warming, an objective and regionally consistent assessment is urgently needed. We use an inventory of 3390 moraine-dammed lakes and their documented outburst history in the past four decades to test whether elevation, lake area and its rate of change, glacier-mass balance, and monsoonality are useful inputs to a probabilistic classification model. We implement these candidate predictors in four Bayesian multi-level logistic regression models to estimate the posterior susceptibility to GLOFs. We find that mostly larger lakes have been more prone to GLOFs in the past four decades regardless of the elevation band in which they occurred. We also find that including the regional average glacier-mass balance improves the model classification. In contrast, changes in lake area and monsoonality play ambiguous roles. Our study provides first quantitative evidence that GLOF susceptibility in the HKKHN scales with lake area, though less so with its dynamics. Our probabilistic prognoses offer improvement compared to a random classification based on average GLOF frequency. Yet they also reveal some major uncertainties that have remained largely unquantified previously and that challenge the applicability of single models. Ensembles of multiple models could be a viable alternative for more accurately classifying the susceptibility of moraine-dammed lakes to GLOFs.
Y1 - 2020
U6 - https://doi.org/10.5194/tc-15-4145-2021
SN - 1994-0416
VL - 15
PB - Copernicus Publications
CY - Göttingen
ER -
TY - JOUR
A1 - Söchting, Maximilian
A1 - Trapp, Matthias
T1 - Controlling image-stylization techniques using eye tracking
JF - Science and Technology Publications
N2 - With the spread of smart phones capable of taking high-resolution photos and the development of high-speed mobile data infrastructure, digital visual media is becoming one of the most important forms of modern communication. With this development, however, also comes a devaluation of images as a media form with the focus becoming the frequency at which visual content is generated instead of the quality of the content. In this work, an interactive system using image-abstraction techniques and an eye tracking sensor is presented, which allows users to experience diverting and dynamic artworks that react to their eye movement. The underlying modular architecture enables a variety of different interaction techniques that share common design principles, making the interface as intuitive as possible. The resulting experience allows users to experience a game-like interaction in which they aim for a reward, the artwork, while being held under constraints, e.g., not blinking. The co nscious eye movements that are required by some interaction techniques hint an interesting, possible future extension for this work into the field of relaxation exercises and concentration training.
KW - Eye-tracking
KW - Image Abstraction
KW - Image Processing
KW - Artistic Image Stylization
KW - Interactive Media
Y1 - 2020
SN - 2184-4321
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Kwiatek, Grzegorz
A1 - Saarno, Tero
A1 - Ader, Thomas
A1 - Blümle, Felix
A1 - Bohnhoff, Marco
A1 - Chendorain, Michael
A1 - Dresen, Georg
A1 - Heikkinen, Pekka
A1 - Kukkonen, Ilmo
A1 - Leary, Peter
A1 - Leonhardt, Maria
A1 - Malin, Peter
A1 - Martinez-Garzon, Patricia
A1 - Passmore, Kevin
A1 - Passmore, Paul
A1 - Valenzuela, Sergio
A1 - Wollin, Christopher
T1 - Controlling fluid-induced seismicity during a 6.1-km-deep geothermal stimulation in Finland
JF - Science Advances
N2 - We show that near-real-time seismic monitoring of fluid injection allowed control of induced earthquakes during the stimulation of a 6.1-km-deep geothermal well near Helsinki, Finland. A total of 18,160 m(3) of fresh water was pumped into crystalline rocks over 49 days in June to July 2018. Seismic monitoring was performed with a 24-station borehole seismometer network. Using near-real-time information on induced-earthquake rates, locations, magnitudes, and evolution of seismic and hydraulic energy, pumping was either stopped or varied-in the latter case, between well-head pressures of 60 and 90 MPa and flow rates of 400 and 800 liters/min. This procedure avoided the nucleation of a project-stopping magnitude M-W 2.0 induced earthquake, a limit set by local authorities. Our results suggest a possible physics-based approach to controlling stimulation-induced seismicity in geothermal projects.
Y1 - 2019
U6 - https://doi.org/10.1126/sciadv.aav7224
SN - 2375-2548
VL - 5
IS - 5
PB - American Association for the Advancement of Science
CY - Washington
ER -
TY - JOUR
A1 - Totz, Sonja Juliana
A1 - Löber, Jakob
A1 - Totz, Jan Frederik
A1 - Engel, Harald
T1 - Control of transversal instabilities in reaction-diffusion systems
JF - New journal of physics : the open-access journal for physics
N2 - In two-dimensional reaction-diffusion systems, local curvature perturbations on traveling waves are typically damped out and vanish. However, if the inhibitor diffuses much faster than the activator, transversal instabilities can arise, leading from flat to folded, spatio-temporally modulated waves and to spreading spiral turbulence. Here, we propose a scheme to induce or inhibit these instabilities via a spatio-temporal feedback loop. In a piecewise-linear version of the FitzHugh-Nagumo model, transversal instabilities and spiral turbulence in the uncontrolled system are shown to be suppressed in the presence of control, thereby stabilizing plane wave propagation. Conversely, in numerical simulations with the modified Oregonator model for the photosensitive Belousov-Zhabotinsky reaction, which does not exhibit transversal instabilities on its own, we demonstrate the feasibility of inducing transversal instabilities and study the emerging wave patterns in a well-controlled manner.
KW - traveling waves
KW - control
KW - transversal instabilities
Y1 - 2018
U6 - https://doi.org/10.1088/1367-2630/aabce5
SN - 1367-2630
VL - 20
PB - IOP Publ. Ltd.
CY - Bristol
ER -
TY - JOUR
A1 - Günthel, Marco
A1 - Donis, Daphne
A1 - Kirillin, Georgiy
A1 - Ionescu, Danny
A1 - Bizic, Mina
A1 - McGinnis, Daniel F.
A1 - Grossart, Hans-Peter
A1 - Tang, Kam W.
T1 - Contribution of oxic methane production to surface methane emission in lakes and its global importance
JF - Nature Communications
N2 - Recent discovery of oxic methane production in sea and lake waters, as well as wetlands, demands re-thinking of the global methane cycle and re-assessment of the contribution of oxic waters to atmospheric methane emission. Here we analysed system-wide sources and sinks of surface-water methane in a temperate lake. Using a mass balance analysis, we show that internal methane production in well-oxygenated surface water is an important source for surface-water methane during the stratified period. Combining our results and literature reports, oxic methane contribution to emission follows a predictive function of littoral sediment area and surface mixed layer volume. The contribution of oxic methane source(s) is predicted to increase with lake size, accounting for the majority (>50%) of surface methane emission for lakes with surface areas >1 km(2).
Y1 - 2019
U6 - https://doi.org/10.1038/s41467-019-13320-0
SN - 2041-1723
VL - 10
PB - Nature Publishing Group UK
CY - London
ER -
TY - JOUR
A1 - Levy, Jessica
A1 - Mussack, Dominic
A1 - Brunner, Martin
A1 - Keller, Ulrich
A1 - Cardoso-Leite, Pedro
A1 - Fischbach, Antoine
T1 - Contrasting classical and machine learning approaches in the estimation of value-added scores in large-scale educational data
JF - Frontiers in psychology
N2 - There is no consensus on which statistical model estimates school value-added (VA) most accurately. To date, the two most common statistical models used for the calculation of VA scores are two classical methods: linear regression and multilevel models. These models have the advantage of being relatively transparent and thus understandable for most researchers and practitioners. However, these statistical models are bound to certain assumptions (e.g., linearity) that might limit their prediction accuracy. Machine learning methods, which have yielded spectacular results in numerous fields, may be a valuable alternative to these classical models. Although big data is not new in general, it is relatively new in the realm of social sciences and education. New types of data require new data analytical approaches. Such techniques have already evolved in fields with a long tradition in crunching big data (e.g., gene technology). The objective of the present paper is to competently apply these "imported" techniques to education data, more precisely VA scores, and assess when and how they can extend or replace the classical psychometrics toolbox. The different models include linear and non-linear methods and extend classical models with the most commonly used machine learning methods (i.e., random forest, neural networks, support vector machines, and boosting). We used representative data of 3,026 students in 153 schools who took part in the standardized achievement tests of the Luxembourg School Monitoring Program in grades 1 and 3. Multilevel models outperformed classical linear and polynomial regressions, as well as different machine learning models. However, it could be observed that across all schools, school VA scores from different model types correlated highly. Yet, the percentage of disagreements as compared to multilevel models was not trivial and real-life implications for individual schools may still be dramatic depending on the model type used. Implications of these results and possible ethical concerns regarding the use of machine learning methods for decision-making in education are discussed.
KW - value-added modeling
KW - school effectiveness
KW - machine learning
KW - model
KW - comparison
KW - longitudinal data
Y1 - 2020
U6 - https://doi.org/10.3389/fpsyg.2020.02190
SN - 1664-1078
VL - 11
PB - Frontiers Research Foundation
CY - Lausanne
ER -
TY - JOUR
A1 - Granado, Felipe Le Vot
A1 - Abad, Enrique
A1 - Metzler, Ralf
A1 - Yuste, Santos B.
T1 - Continuous time random walk in a velocity field
BT - role of domain growth, Galilei-invariant advection-diffusion, and kinetics of particle mixing
JF - New Journal of Physics
N2 - We consider the emerging dynamics of a separable continuous time random walk (CTRW) in the case when the random walker is biased by a velocity field in a uniformly growing domain. Concrete examples for such domains include growing biological cells or lipid vesicles, biofilms and tissues, but also macroscopic systems such as expanding aquifers during rainy periods, or the expanding Universe. The CTRW in this study can be subdiffusive, normal diffusive or superdiffusive, including the particular case of a Lévy flight. We first consider the case when the velocity field is absent. In the subdiffusive case, we reveal an interesting time dependence of the kurtosis of the particle probability density function. In particular, for a suitable parameter choice, we find that the propagator, which is fat tailed at short times, may cross over to a Gaussian-like propagator. We subsequently incorporate the effect of the velocity field and derive a bi-fractional diffusion-advection equation encoding the time evolution of the particle distribution. We apply this equation to study the mixing kinetics of two diffusing pulses, whose peaks move towards each other under the action of velocity fields acting in opposite directions. This deterministic motion of the peaks, together with the diffusive spreading of each pulse, tends to increase particle mixing, thereby counteracting the peak separation induced by the domain growth. As a result of this competition, different regimes of mixing arise. In the case of Lévy flights, apart from the non-mixing regime, one has two different mixing regimes in the long-time limit, depending on the exact parameter choice: in one of these regimes, mixing is mainly driven by diffusive spreading, while in the other mixing is controlled by the velocity fields acting on each pulse. Possible implications for encounter–controlled reactions in real systems are discussed.
KW - diffusion
KW - expanding medium
KW - continuous time random walk
Y1 - 2020
U6 - https://doi.org/10.1088/1367-2630/ab9ae2
SN - 1367-2630
VL - 22
PB - Dt. Physikalische Ges.
CY - Bad Honnef
ER -
TY - JOUR
A1 - Gutschmann, Björn
A1 - Simões, Matilde Maldonado
A1 - Schiewe, Thomas
A1 - Schröter, Edith S.
A1 - Münzberg, Marvin
A1 - Neubauer, Peter
A1 - Bockisch, Anika
A1 - Riedel, Sebastian Lothar Stefan
T1 - Continuous feeding strategy for polyhydroxyalkanoate production from solid waste animal fat at laboratory- and pilot-scale
JF - Microbial biotechnology / Society for Applied Microbiology
N2 - Bioconversion of waste animal fat (WAF) to polyhydroxyalkanoates (PHAs) is an approach to lower the production costs of these plastic alternatives. However, the solid nature of WAF requires a tailor-made process development. In this study, a double-jacket feeding system was built to thermally liquefy the WAF to employ a continuous feeding strategy. During laboratory-scale cultivations with Ralstonia eutropha Re2058/pCB113, 70% more PHA (45 g(PHA) L-1) and a 75% higher space-time yield (0.63 g(PHA) L-1 h(-1)) were achieved compared to previously reported fermentations with solid WAF. During the development process, growth and PHA formation were monitored in real-time by in-line photon density wave spectroscopy. The process robustness was further evaluated during scale-down fermentations employing an oscillating aeration, which did not alter the PHA yield although cells encountered periods of oxygen limitation. Flow cytometry with propidium iodide staining showed that more than two-thirds of the cells were viable at the end of the cultivation and viability was even little higher in the scale-down cultivations. Application of this feeding system at 150-L pilot-scale cultivation yielded in 31.5 g(PHA) L-1, which is a promising result for the further scale-up to industrial scale.
Y1 - 2022
U6 - https://doi.org/10.1111/1751-7915.14104
SN - 1751-7915
PB - Wiley
CY - Hoboken
ER -
TY - JOUR
A1 - Piro, Vitor C.
A1 - Renard, Bernhard Y.
T1 - Contamination detection and microbiome exploration with GRIMER
JF - GigaScience
N2 - Background:
Contamination detection is a important step that should be carefully considered in early stages when designing and performing microbiome studies to avoid biased outcomes. Detecting and removing true contaminants is challenging, especially in low-biomass samples or in studies lacking proper controls. Interactive visualizations and analysis platforms are crucial to better guide this step, to help to identify and detect noisy patterns that could potentially be contamination. Additionally, external evidence, like aggregation of several contamination detection methods and the use of common contaminants reported in the literature, could help to discover and mitigate contamination.
Results:
We propose GRIMER, a tool that performs automated analyses and generates a portable and interactive dashboard integrating annotation, taxonomy, and metadata. It unifies several sources of evidence to help detect contamination. GRIMER is independent of quantification methods and directly analyzes contingency tables to create an interactive and offline report. Reports can be created in seconds and are accessible for nonspecialists, providing an intuitive set of charts to explore data distribution among observations and samples and its connections with external sources. Further, we compiled and used an extensive list of possible external contaminant taxa and common contaminants with 210 genera and 627 species reported in 22 published articles.
Conclusion:
GRIMER enables visual data exploration and analysis, supporting contamination detection in microbiome studies. The tool and data presented are open source and available at https://gitlab.com/dacs-hpi/grimer.
KW - Contamination
KW - Microbiome
KW - Visualization
KW - Taxonomy
Y1 - 2023
U6 - https://doi.org/10.1093/gigascience/giad017
SN - 2047-217X
VL - 12
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Saura-Ziegelmeyer, Arnaud
ED - Bièvre-Perrin, Fabien
ED - Carlà-Uhink, Filippo
ED - Rollinger, Christian
ED - Walde, Christine
T1 - Construire ses propres modèles : le cas des bandes sonores post-Gladiator
JF - thersites 13: Antiquipop – Chefs d’œuvres revisités
N2 - Ringing trumpets announcing the arrival of a Roman emperor, an oriental flowing and delicate harp reverberating inside the intimate palace of an Egyptian queen, a rude aulos singing in a bucolic Greek landscape: where are these familiar sound images coming from? Are these creations inspired by archaeological data or built after modern fantasy? The scarcity of ancient musical data necessitated, in fact, to reinvent the films’ soundscape taking place in the Ancient world. It is therefore a question of seeing on which models a peplum’s soundtrack is conceived and what it can reveal on our way of perceiving the ancient and contemporary world. Far from wanting to gauge the historicity of the sound backgrounds offered to the spectator of dark rooms, it is rather a question of seeing the imitation phenomena that can appear from the sound clichés created by the peplum itself and of also deducing from them thought patterns which, contextualized, influence these compositions. This article will focus on post-2000 productions.
KW - music
KW - peplum
KW - antiquity
KW - otherness
KW - reception studies
Y1 - 2021
U6 - https://doi.org/10.34679/thersites.vol13.150
SN - 2364-7612
VL - 2021
IS - 13
SP - 141
EP - 168
ER -
TY - JOUR
A1 - Poghosyan, Suren
A1 - Zessin, Hans
T1 - Construction of limiting Gibbs processes and the uniqueness of Gibbs processes
JF - Lectures in pure and applied mathematics
KW - random point processes
KW - statistical mechanics
KW - stochastic analysis
Y1 - 2020
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-472015
SN - 978-3-86956-485-2
SN - 2199-4951
SN - 2199-496X
IS - 6
SP - 55
EP - 64
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Galka, Andreas
A1 - Moontaha, Sidratul
A1 - Siniatchkin, Michael
T1 - Constrained expectation maximisation algorithm for estimating ARMA models in state space representation
JF - EURASIP journal on advances in signal processing
N2 - This paper discusses the fitting of linear state space models to given multivariate time series in the presence of constraints imposed on the four main parameter matrices of these models. Constraints arise partly from the assumption that the models have a block-diagonal structure, with each block corresponding to an ARMA process, that allows the reconstruction of independent source components from linear mixtures, and partly from the need to keep models identifiable. The first stage of parameter fitting is performed by the expectation maximisation (EM) algorithm. Due to the identifiability constraint, a subset of the diagonal elements of the dynamical noise covariance matrix needs to be constrained to fixed values (usually unity). For this kind of constraints, so far, no closed-form update rules were available. We present new update rules for this situation, both for updating the dynamical noise covariance matrix directly and for updating a matrix square-root of this matrix. The practical applicability of the proposed algorithm is demonstrated by a low-dimensional simulation example. The behaviour of the EM algorithm, as observed in this example, illustrates the well-known fact that in practical applications, the EM algorithm should be combined with a different algorithm for numerical optimisation, such as a quasi-Newton algorithm.
KW - Kalman filtering
KW - state space modelling
KW - expectation maximisation algorithm
Y1 - 2020
U6 - https://doi.org/10.1186/s13634-020-00678-3
SN - 1687-6180
VL - 2020
IS - 1
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Yang, Jin
A1 - Ghosh, Samrat
A1 - Roeser, Jérôme
A1 - Acharjya, Amitava
A1 - Penschke, Christopher
A1 - Tsutsui, Yusuke
A1 - Rabeah, Jabor
A1 - Wang, Tianyi
A1 - Tameu, Simon Yves Djoko
A1 - Ye, Meng-Yang
A1 - Grüneberg, Julia
A1 - Li, Shuang
A1 - Li, Changxia
A1 - Schomaecker, Reinhard
A1 - Van de Krol, Roel
A1 - Seki, Shu
A1 - Saalfrank, Peter
A1 - Thomas, Arne
T1 - Constitutional isomerism of the linkages in donor–acceptor covalent organic frameworks and its impact on photocatalysis
JF - Nature Communications
N2 - When new covalent organic frameworks (COFs) are designed, the main efforts are typically focused on selecting specific building blocks with certain geometries and properties to control the structure and function of the final COFs. The nature of the linkage (imine, boroxine, vinyl, etc.) between these building blocks naturally also defines their properties. However, besides the linkage type, the orientation, i.e., the constitutional isomerism of these linkages, has rarely been considered so far as an essential aspect. In this work, three pairs of constitutionally isomeric imine-linked donor-acceptor (D-A) COFs are synthesized, which are different in the orientation of the imine bonds (D-C=N-A (DCNA) and D-N=C-A (DNCA)). The constitutional isomers show substantial differences in their photophysical properties and consequently in their photocatalytic performance. Indeed, all DCNA COFs show enhanced photocatalytic H2 evolution performance than the corresponding DNCA COFs. Besides the imine COFs shown here, it can be concluded that the proposed concept of constitutional isomerism of linkages in COFs is quite universal and should be considered when designing and tuning the properties of COFs.
Y1 - 2022
U6 - https://doi.org/10.1038/s41467-022-33875-9
SN - 2041-1723
VL - 13
IS - 1
PB - Nature Publishing Group UK
CY - [London]
ER -
TY - JOUR
A1 - Eiteljoerge, Sarah Fe Vivian
A1 - Adam, Maurits
A1 - Elsner, Birgit
A1 - Mani, Nivedita
T1 - Consistency of co-occurring actions influences young children’s word learning learning
JF - Royal Society Open Science
N2 - Communication with young children is often multimodal in nature, involving, for example, language and actions. The simultaneous presentation of information from both domains may boost language learning by highlighting the connection between an object and a word, owing to temporal overlap in the presentation of multimodal input. However, the overlap is not merely temporal but can also covary in the extent to which particular actions co-occur with particular words and objects, e.g. carers typically produce a hopping action when talking about rabbits and a snapping action for crocodiles. The frequency with which actions and words co-occurs in the presence of the referents of these words may also impact young children’s word learning. We, therefore, examined the extent to which consistency in the co-occurrence of particular actions and words impacted children’s learning of novel word–object associations. Children (18 months, 30 months and 36–48 months) and adults were presented with two novel objects and heard their novel labels while different actions were performed on these objects, such that the particular actions and word–object pairings always co-occurred (Consistent group) or varied across trials (Inconsistent group). At test, participants saw both objects and heard one of the labels to examine whether participants recognized the target object upon hearing its label. Growth curve models revealed that 18-month-olds did not learn words for objects in either condition, and 30-month-old and 36- to 48-month-old children learned words for objects only in the Consistent condition, in contrast to adults who learned words for objects independent of the actions presented. Thus, consistency in the multimodal input influenced word learning in early childhood but not in adulthood. In terms of a dynamic systems account of word learning, our study shows how multimodal learning settings interact with the child’s perceptual abilities to shape the learning experience.
KW - word learning
KW - actions
KW - consistency
KW - variability
KW - cross-domain influences
Y1 - 2019
U6 - https://doi.org/10.1098/rsos.190097
SN - 2054-5703
VL - 6
IS - 8
PB - Royal Society
CY - London
ER -
TY - JOUR
A1 - Tylus, Piotr
ED - Ette, Ottmar
ED - Knobloch, Eberhard
T1 - Considérations sur l’atmosphère des tropiques… – un mémoire inédit d’Alexander von Humboldt
JF - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies
N2 - L’article contient l’édition critique d’un mémoire d’Alexander von Humboldt, intitulé: «Considérations sur l’atmosphère des tropiques, regardée comme objet de la pathologie chimique». Le texte a été écrit à Cuba, en 1801. Il fait partie d’un groupe de manuscrits, relatifs à la qualité de l’air dans les tropiques et aux maladies qui en découlent, portant un titre général: «C’est mon cahier de la Havanne intitulé sur la salubrité de l’air». Or A. v. Humboldt partageait alors les vues miasmatiques et il voyait, dans la qualité de l’air, l’origine des maladies que l’on dit aujourd’hui «infectieuses». L’accent y est posé sur la fièvre jaune qui occupait une place particulière dans l’horizon intellectuel et politique du début du XIXe siècle. Reste à ajouter que Humboldt se montre ici comme l’un des précurseurs de l’écologie moderne.
N2 - Der Beitrag liefert eine kritische Ausgabe des 1801 auf Kuba niedergeschriebenen Textes Alexander von Humboldts unter dem Titel „Considérations sur l’atmosphère des tropiques, regardée comme objet de la pathologie chimique“. Er wird in der Mappe mit Humboldts Handschriften zu der Luftqualität in den Tropen und den daraus resultierenden Krankheiten aufbewahrt, die von dem Gelehrten mit der Aufschrift „Cʼest mon cahier de la Havanne intitulé sur la salubrité de lʼair“ identifiziert wurde. Zur Zeit der Entstehung des Manuskripts war Alexander von Humboldt Anhänger der Miasmentheorie und erkannte in der Luftqualität den Ursprung der Krankheiten, die heutzutage als „ansteckend“ bezeichnet werden. Der Text konzentriert sich vor allem auf das Gelbfieber und somit auf eine Krankheit, die einen wichtigen Platz im geistigen und politischen Horizont der ersten Jahrzehnte des 19. Jahrhunderts einnahm. Er lässt die Leistung Alexander von Humboldts als Vorläufer der modernen Ökologie erkennen.
N2 - The article contains the critical edition of Alexander von Humboldtʼs text “Considérations sur l’atmosphère des tropiques, regardée comme objet de la pathologie chimique”, created in Cuba, in 1801. The text can be found in a group of manuscripts referring to the quality of the air in the tropics and to diseases that result from it; those manuscripts have a general title: “C’est mon cahier de la Havanne intitulé sur la salubrité de l’air”. A. v. Humboldt shared miasmatic views at that time and in the quality of the air he saw the cause of diseases called «infectious» nowadays . The emphasis is placed on yellow fever, which occupied a prominent place in intellectual and political horizons at the beginning of 19th century. It remains to be added that Humboldt writes here as a precursor of modern ecology.
KW - le Patrimoine d’Alexander von Humboldt
KW - manuscrits
KW - Bibliothèque Jagellonne (le Fonds Berlinois)
KW - édition critique
KW - fièvre jaune
Y1 - 2020
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-488325
SN - 2568-3543
SN - 1617-5239
VL - XXI
IS - 41
SP - 5
EP - 26
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Sowemimo, Oluwakemi T.
A1 - Knox-Brown, Patrick
A1 - Borcherds, Wade
A1 - Rindfleisch, Tobias
A1 - Thalhammer, Anja
A1 - Daughdrill, Gary W.
T1 - Conserved Glycines Control Disorder and Function in the Cold-Regulated Protein, COR15A
JF - Biomolecules
N2 - Cold-regulated (COR) 15A is an intrinsically disordered protein (IDP) from Arabidopsis thaliana important for freezing tolerance. During freezing-induced cellular dehydration, COR15A transitions from a disordered to mostly alpha-helical structure. We tested whether mutations that increase the helicity of COR15A also increase its protective function. Conserved glycine residues were identified and mutated to alanine. Nuclear magnetic resonance (NMR) spectroscopy was used to identify residue-specific changes in helicity for wildtype (WT) COR15A and the mutants. Circular dichroism (CD) spectroscopy was used to monitor the coil-helix transition in response to increasing concentrations of trifluoroethanol (TFE) and ethylene glycol. The impact of the COR15A mutants on the stability of model membranes during a freeze-thaw cycle was investigated by fluorescence spectroscopy. The results of these experiments showed the mutants had a higher content of alpha-helical structure and the increased alpha-helicity improved membrane stabilization during freezing. Comparison of the TFE- and ethylene glycol-induced coil-helix transitions support our conclusion that increasing the transient helicity of COR15A in aqueous solution increases its ability to stabilize membranes during freezing. Altogether, our results suggest the conserved glycine residues are important for maintaining the disordered structure of COR15A but are also compatible with the formation of alpha-helical structure during freezing induced dehydration.
KW - COR15A
KW - Late embryogenesis abundant
KW - intrinsically disordered proteins
KW - Trifluoroethanol
KW - Nuclear magnetic resonance
Y1 - 2019
U6 - https://doi.org/10.3390/biom9030084
SN - 2218-273X
VL - 9
IS - 3
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Gorin, Vladislav A.
A1 - Scherz, Mark D.
A1 - Korost, Dmitry V.
A1 - Poyarkov, Nikolay A.
T1 - Consequences of parallel miniaturisation in Microhylinae (Anura, Microhylidae), with the description of a new genus of diminutive South East Asian frogs
JF - Zoosystematics and evolution : Mitteilungen aus dem Museum für Naturkunde in Berlin
N2 - The genus Microhyla Tschudi, 1838 includes 52 species and is one of the most diverse genera of the family Microhylidae, being the most species-rich taxon of the Asian subfamily Microhylinae. The recent, rapid description of numerous new species of Microhyla with complex phylogenetic relationships has made the taxonomy of the group especially challenging. Several recent phylogenetic studies suggested paraphyly of Microhyla with respect to Glyphoglossus Gunther, 1869, and revealed three major phylogenetic lineages of mid-Eocene origin within this assemblage. However, comprehensive works assessing morphological variation among and within these lineages are absent. In the present study we investigate the generic taxonomy of Microhyla-Glyphoglossus assemblage based on a new phylogeny including 57 species, comparative morphological analysis of skeletons from cleared-and-stained specimens for 23 species, and detailed descriptions of generalized osteology based on volume-rendered micro-CT scans for five speciesal-together representing all major lineages within the group. The results confirm three highly divergent and well-supported clades that correspond with external and osteological morphological characteristics, as well as respective geographic distribution. Accordingly, acknowledging ancient divergence between these lineages and their significant morphological differentiation, we propose to consider these three lineages as distinct genera: Microhyla sensu stricto, Glyphoglossus, and a newly described genus, Nanohyla gen. nov.
KW - Amphibians
KW - integrative taxonomy
KW - narrow-mouthed frogs
KW - micro-computed tomography
KW - Nanohyla gen. nov
KW - osteology
KW - sexual dimorphism
KW - taxonomic revision
Y1 - 2021
U6 - https://doi.org/10.3897/zse.97.57968
SN - 1860-0743
SN - 1435-1935
VL - 97
IS - 1
SP - 21
EP - 54
PB - Pensoft Publishers
CY - Sofia
ER -
TY - JOUR
A1 - Barlow, Axel
A1 - Hartmann, Stefanie
A1 - Gonzalez, Javier
A1 - Hofreiter, Michael
A1 - Paijmans, Johanna L. A.
T1 - Consensify
BT - a method for generating pseudohaploid genome sequences from palaeogenomic datasets with reduced error rates
JF - Genes / Molecular Diversity Preservation International
N2 - A standard practise in palaeogenome analysis is the conversion of mapped short read data into pseudohaploid sequences, frequently by selecting a single high-quality nucleotide at random from the stack of mapped reads. This controls for biases due to differential sequencing coverage, but it does not control for differential rates and types of sequencing error, which are frequently large and variable in datasets obtained from ancient samples. These errors have the potential to distort phylogenetic and population clustering analyses, and to mislead tests of admixture using D statistics. We introduce Consensify, a method for generating pseudohaploid sequences, which controls for biases resulting from differential sequencing coverage while greatly reducing error rates. The error correction is derived directly from the data itself, without the requirement for additional genomic resources or simplifying assumptions such as contemporaneous sampling. For phylogenetic and population clustering analysis, we find that Consensify is less affected by artefacts than methods based on single read sampling. For D statistics, Consensify is more resistant to false positives and appears to be less affected by biases resulting from different laboratory protocols than other frequently used methods. Although Consensify is developed with palaeogenomic data in mind, it is applicable for any low to medium coverage short read datasets. We predict that Consensify will be a useful tool for future studies of palaeogenomes.
KW - palaeogenomics
KW - ancient DNA
KW - sequencing error
KW - error reduction
KW - D statistics
KW - bioinformatics
Y1 - 2020
U6 - https://doi.org/10.3390/genes11010050
SN - 2073-4425
VL - 11
IS - 1
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - von Moritz, Brescius
T1 - Connecting the new world
BT - Nets, mobility and progress in the age of Alexander von Humboldt
N2 - This article explores the link between the profound technological transformations of the nineteenth century and the life and work of the Prussian scholar Alexander von Humboldt (1769-1859). It analyses how Humboldt sought to appropriate the revolutionary new communication and transportation technologies of the time in order to integrate the American continent into global networks of commercial, intellectual and material exchange. Recent scholarship on Humboldt’s expedition to the New World (1799-1804) has claimed that his descriptions of tropical landscapes opened up South America to a range of ‘transformative interventions’ (Pratt) by European capitalists and investors. These studies, however, have not analysed the motivations underlying Humboldt’s support for such intrusions into nature. Furthermore, they have not explored the role that such projects played in shaping Humboldt’s understanding of the forces behind the progress of societies. To comprehend Humboldt’s approval for human interventions in America’s natural world, this study first explores the role that eighteenth-century theories of progress and the notion of geographical determinism played in shaping his conception of civilisational development. It will look at concrete examples of transformative interventions in the American hemisphere that were actively proposed by Humboldt and intended to overcome natural obstacles to human interaction. These were the use of steamships, electric telegraphy, railroads and large-scale canals that together enabled global trade and communication to occur at an unprecedented pace. All these contemporary innovations will be linked to the four motifs of nets, mobility, progress and acceleration, which were driving forces behind the ‘transformation of the world’ that took place in the course of the nineteenth century.
N2 - Dieser Artikel untersucht das Verhältnis zwischen den revolutionären technologischen Neuerungen des 19. Jahrhunderts und dem Leben und Wirken Alexander von Humboldts (1769-1859). Dabei wird gefragt, wie Humboldt versuchte, die neuen und sprichwörtlich bahnbrechenden Kommunikations- und Transporttechnologien seiner Zeit zu nutzen, um den amerikanischen Kontinent in globale kommerzielle und kulturelle Austauschprozesse zu integrieren. Jüngere Forschungen zu Humboldts amerikanischer Expedition (1799-1804) haben behauptet, dass seine Beschreibungen Südamerikas den Kontinent für zahlreiche ’transformative interventions’ (Pratt) von Seiten europäischer Kapitalisten und Investoren zugänglich gemacht hätten. Diese Studien haben jedoch nicht analysiert, aus welchen Motiven heraus Humboldt diese Eingriffe in die Natur unterstützte. Darüber hinaus wurde nicht der zentralen Frage nachgegangen, welche Rolle diese Projekte in Humboldts eigener Auffassung über die Kräfte des gesellschaftlichen Fortschritts gespielt haben. Um Humboldts Unterstützung für tiefgreifende Eingriffe in die Natur Amerikas nachvollziehen zu können, analysiert dieser Artikel zunächst, welche Rolle der ‚Geodeterminismus’ und die Fortschrittstheorien der Aufklärung in seinem Verständnis von zivilisatorischer Entwicklung spielten. Dabei sollen solche Beispiele menschlicher Interventionen in die Natur Amerikas untersucht werden, die Humboldt selbst aktiv förderte – nicht zuletzt, da sie geeignet schienen, ‚natürliche’ Barrieren für gesellschaftliche Austauschprozesse zu beseitigen. Dies waren vor allem die Nutzung von Dampfschiffen, elektrischer Telegrafie, Eisenbahnen und großangelegten Kanalprojekten, deren gebündelte Effekte zu einer signifikanten Beschleunigung von Welthandel und Kommunikationsprozessen führten. Diese zeitgenössischen Innovationen sollen mit den vier Motiven ‚Netz’, ‚Mobilität’, ‚Fortschritt’ und ‚Beschleunigung’ analytisch verbunden werden, da diese Faktoren eine zentrale Rolle für die ‚Verwandlung der Welt’ im 19. Jahrhundert spielten.
N2 - Este artículo examina la relación entre las profundas transformaciones tecnológicas del siglo XIX y la vida y obra del estudioso prusiano Alexander von Humboldt (1769-1859). Para ello, analizaremos cómo Humboldt trató de apropiarse de las nuevas y revolucionarias tecnologías de comunicación y transporte de su tiempo, de cara a poder integrar el continente americano en redes globales de intercambio comercial, material e intelectual. Estudios recientes sobre la expedición de Humboldt al Nuevo Mundo (1799-1804) han demostrado que sus descripciones de los paisajes tropicales americanos abrieron Sudamérica a una serie de ‘intervenciones transformativas’ (Mary Louise Pratt) lideradas por capitalistas e inversores europeos. No obstante, estos estudios no han analizado las motivaciones que llevaron a Humboldt a prestar su apoyo a tamañas intrusiones en la naturaleza. Más aún, tampoco han intentado analizar cómo estos proyectos influyeron sobre Humboldt, sobre su manera de entender las fuerzas motoras que se escondían tras el progreso de las sociedades. Con el objetivo de entender la aprobación de Humboldt a las intervenciones humanas que se llevaron a cabo en el suelo americano, este estudio se centrará primero en explorar el papel que las teorías sobre el progreso del siglo XVIII, así como la noción de determinismo geográfico, tuvieron en la concepción que tenía el investigador prusiano del desarrollo de las civilizaciones. Se estudiarán, para ello, algunos casos concretos de intervenciones transformativas que se llevaron a cabo en el hemisferio americano y que, propuestas con entusiasmo por el mismo Humboldt, intentaron superar los obstáculos naturales que dificultaban la intervención humana. Nos referiremos, más particularmente, al uso de barcos a vapor, telégrafos eléctricos, vías férreas y canales de gran escala. En definitiva, elementos que dieron lugar, en su conjunto, a un comercio y una comunicación global que se llevaron a cabo a un ritmo sin precedentes. Una serie de innovaciones que habrá que relacionar con cuatro temas fundamentales: redes, movilidad, progreso y aceleración; fuerzas motoras de la ‘transformación del mundo’ que tuvo lugar a lo largo del siglo XIX.
KW - Aufklärung
KW - Beschleunigung
KW - Fortschritt
KW - Kommunikation
KW - Mobilität
KW - Netz
KW - Transporttechnologie
Y1 - 2012
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-62386
SN - 1617-5239
SN - 2568-3543
VL - XIII
IS - 25
SP - 11
EP - 33
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Beirne, Elaine
A1 - Nic Giolla Mhichíl, Mairéad
A1 - Brown, Mark
A1 - Mac Lochlainn, Conchúr
T1 - Confidence Counts
BT - Fostering Online Learning Self-Efficacy with a MOOC
JF - EMOOCs 2021
N2 - The increasing reliance on online learning in higher education has been further expedited by the on-going Covid-19 pandemic. Students need to be supported as they adapt to this new learning environment. Research has established that learners with positive online learning self-efficacy beliefs are more likely to persevere and achieve their higher education goals when learning online. In this paper, we explore how MOOC design can contribute to the four sources of self-efficacy beliefs posited by Bandura [4]. Specifically, we will explore, drawing on learner reflections, whether design elements of the MOOC, The Digital Edge: Essentials for the Online Learner, provided participants with the necessary mastery experiences, vicarious experiences, verbal persuasion, and affective regulation opportunities, to evaluate and develop their online learning self-efficacy beliefs. Findings from a content analysis of discussion forum posts show that learners referenced three of the four information sources when reflecting on their experience of the MOOC. This paper illustrates the potential of MOOCs as a pedagogical tool for enhancing online learning self-efficacy among students.
Y1 - 2021
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-517220
SN - 978-3-86956-512-5
VL - 2021
SP - 201
EP - 208
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Sandau, Ingo
A1 - Chaabene, Helmi
A1 - Granacher, Urs
T1 - Concurrent validity of barbell force measured from video-based barbell kinematics during the snatch in male elite weightlifters
JF - PLOS ONE / Public Library of Science
N2 - This study examined the concurrent validity of an inverse dynamic (force computed from barbell acceleration [reference method]) and a work-energy (force computed from work at the barbell [alternative method]) approach to measure the mean vertical barbell force during the snatch using kinematic data from video analysis. For this purpose, the acceleration phase of the snatch was analyzed in thirty male medal winners of the 2018 weightlifting World Championships (age: 25.2±3.1 years; body mass: 88.9±28.6 kg). Vertical barbell kinematics were measured using a custom-made 2D real-time video analysis software. Agreement between the two computational approaches was assessed using Bland-Altman analysis, Deming regression, and Pearson product-moment correlation. Further, principal component analysis in conjunction with multiple linear regression was used to assess whether individual differences related to the two approaches are due to the waveforms of the acceleration time-series data. Results indicated no mean difference (p > 0.05; d = −0.04) and an extremely large correlation (r = 0.99) between the two approaches. Despite the high agreement, the total error of individual differences was 8.2% (163.0 N). The individual differences can be explained by a multiple linear regression model (R2adj = 0.86) on principal component scores from the principal component analysis of vertical barbell acceleration time-series waveforms. Findings from this study indicate that the individual errors of force measures can be associated with the inverse dynamic approach. This approach uses vertical barbell acceleration data from video analysis that is prone to error. Therefore, it is recommended to use the work-energy approach to compute mean vertical barbell force as this approach did not rely on vertical barbell acceleration.
KW - Acceleration
KW - Linear regression analysis
KW - Velocity
KW - Principal component analysis
KW - Kinematics
KW - Motion
KW - Scanning electron microscopy
KW - Computer Software
Y1 - 2021
U6 - https://doi.org/10.1371/journal.pone.0254705
SN - 1932-6203
VL - 16
IS - 7
PB - PLOS
CY - San Francisco
ER -
TY - JOUR
A1 - Bouamra, Marwa
A1 - Zouhal, Hassane
A1 - Ratel, Sébastien
A1 - Makhlouf, Issam
A1 - Bezrati, Ikram
A1 - Chtara, Moktar
A1 - Behm, David George
A1 - Granacher, Urs
A1 - Chaouachi, Anis
T1 - Concurrent Training Promotes Greater Gains on Body Composition and Components of Physical Fitness Than Single-Mode Training (Endurance or Resistance) in Youth With Obesity
JF - Frontiers in Physiology
N2 - The prevalence of obesity in the pediatric population has become a major public health issue. Indeed, the dramatic increase of this epidemic causes multiple and harmful consequences, Physical activity, particularly physical exercise, remains to be the cornerstone of interventions against childhood obesity. Given the conflicting findings with reference to the relevant literature addressing the effects of exercise on adiposity and physical fitness outcomes in obese children and adolescents, the effect of duration-matched concurrent training (CT) [50% resistance (RT) and 50% high-intensity-interval-training (HIIT)] on body composition and physical fitness in obese youth remains to be elucidated. Thus, the purpose of this study was to examine the effects of 9-weeks of CT compared to RT or HIIT alone, on body composition and selected physical fitness components in healthy sedentary obese youth. Out of 73 participants, only 37; [14 males and 23 females; age 13.4 ± 0.9 years; body-mass-index (BMI): 31.2 ± 4.8 kg·m-2] were eligible and randomized into three groups: HIIT (n = 12): 3-4 sets×12 runs at 80–110% peak velocity, with 10-s passive recovery between bouts; RT (n = 12): 6 exercises; 3–4 sets × 10 repetition maximum (RM) and CT (n = 13): 50% serial completion of RT and HIIT. CT promoted significant greater gains compared to HIIT and RT on body composition (p < 0.01, d = large), 6-min-walking test distance (6 MWT-distance) and on 6 MWT-VO2max (p < 0.03, d = large). In addition, CT showed substantially greater improvements than HIIT in the medicine ball throw test (20.2 vs. 13.6%, p < 0.04, d = large). On the other hand, RT exhibited significantly greater gains in relative hand grip strength (p < 0.03, d = large) and CMJ (p < 0.01, d = large) than HIIT and CT. CT promoted greater benefits for fat, body mass loss and cardiorespiratory fitness than HIIT or RT modalities. This study provides important information for practitioners and therapists on the application of effective exercise regimes with obese youth to induce significant and beneficial body composition changes. The applied CT program and the respective programming parameters in terms of exercise intensity and volume can be used by practitioners as an effective exercise treatment to fight the pandemic overweight and obesity in youth.
KW - weight loss
KW - adolescents
KW - high-intensity-interval training
KW - resistance training
KW - DXA
KW - matched time
Y1 - 2022
U6 - https://doi.org/10.3389/fphys.2022.869063
SN - 1664-042X
VL - 13
SP - 1
EP - 16
PB - Frontiers
CY - Lausanne, Schweiz
ER -
TY - JOUR
A1 - Mattern, Maximilian
A1 - Reppert, Alexander von
A1 - Zeuschner, Steffen Peer
A1 - Herzog, Marc
A1 - Pudell, Jan-Etienne
A1 - Bargheer, Matias
T1 - Concepts and use cases for picosecond ultrasonics with x-rays
JF - Photoacoustics
N2 - This review discusses picosecond ultrasonics experiments using ultrashort hard x-ray probe pulses to extract the transient strain response of laser-excited nanoscopic structures from Bragg-peak shifts. This method provides direct, layer-specific, and quantitative information on the picosecond strain response for structures down to few-nm thickness. We model the transient strain using the elastic wave equation and express the driving stress using Gruneisen parameters stating that the laser-induced stress is proportional to energy density changes in the microscopic subsystems of the solid, i.e., electrons, phonons and spins. The laser-driven strain response can thus serve as an ultrafast proxy for local energy-density and temperature changes, but we emphasize the importance of the nanoscale morphology for an accurate interpretation due to the Poisson effect. The presented experimental use cases encompass ultrathin and opaque metal-heterostructures, continuous and granular nanolayers as well as negative thermal expansion materials, that each pose a challenge to established all-optical techniques.
KW - Picosecond ultrasonics
KW - Ultrafast x-ray diffraction
KW - Ultrafast x-ray
KW - scattering
KW - Ultrafast photoacoustics
KW - Nanoscale heat transfer
KW - Negative
KW - thermal expansion
Y1 - 2023
U6 - https://doi.org/10.1016/j.pacs.2023.100503
SN - 2213-5979
VL - 31
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Eikerling, Maren
A1 - Vona, Francesco
A1 - Garzotto, Franca
A1 - Lorusso, Maria Luisa
T1 - Computergestützte, bilinguale Screenings
BT - Risikoidentifikation von LRS und SES bei zweisprachigen Kindern mit der modifizierbaren Web-App MuLiMi
JF - Spektrum Patholinguistik
Y1 - 2021
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-510426
SN - 978-3-86956-507-1
SN - 1866-9085
SN - 1866-9433
IS - 14
SP - 139
EP - 147
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Kar, Manaswita
A1 - Körzdörfer, Thomas
T1 - Computational high throughput screening of inorganic cation based halide perovskites for perovskite only tandem solar cells
JF - Materials Research Express
N2 - We search for homovalent alternatives for A, B, and X-ions in ABX(3) type inorganic halide perovskites suitable for tandem solar cell applications. We replace the conventional A-site organic cation CH3NH3, by 3 inorganic cations, Cs, K, and Rb, and the B site consists of metals; Cd, Hg, Ge, Pb, and Sn This work is built on our previous high throughput screening of hybrid perovskite materials (Kar et al 2018 J. Chem. Phys. 149, 214701). By performing a systematic screening study using Density Functional Theory (DFT) methods, we found 11 suitable candidates; 2 Cs-based, 3 K-based and 6 Rb-based that are suitable for tandem solar cell applications.
KW - inorganic perovskites
KW - tandem solar cells
KW - density functional theory
Y1 - 2020
U6 - https://doi.org/10.1088/2053-1591/ab8c0d
SN - 2053-1591
VL - 7
IS - 5
SP - 1
EP - 10
PB - IOP Publ. Ltd.
CY - Bristol
ER -
TY - JOUR
A1 - Perscheid, Cindy
T1 - Comprior
BT - Facilitating the implementation and automated benchmarking of prior knowledge-based feature selection approaches on gene expression data sets
JF - BMC Bioinformatics
N2 - Background
Reproducible benchmarking is important for assessing the effectiveness of novel feature selection approaches applied on gene expression data, especially for prior knowledge approaches that incorporate biological information from online knowledge bases. However, no full-fledged benchmarking system exists that is extensible, provides built-in feature selection approaches, and a comprehensive result assessment encompassing classification performance, robustness, and biological relevance. Moreover, the particular needs of prior knowledge feature selection approaches, i.e. uniform access to knowledge bases, are not addressed. As a consequence, prior knowledge approaches are not evaluated amongst each other, leaving open questions regarding their effectiveness.
Results
We present the Comprior benchmark tool, which facilitates the rapid development and effortless benchmarking of feature selection approaches, with a special focus on prior knowledge approaches. Comprior is extensible by custom approaches, offers built-in standard feature selection approaches, enables uniform access to multiple knowledge bases, and provides a customizable evaluation infrastructure to compare multiple feature selection approaches regarding their classification performance, robustness, runtime, and biological relevance.
Conclusion
Comprior allows reproducible benchmarking especially of prior knowledge approaches, which facilitates their applicability and for the first time enables a comprehensive assessment of their effectiveness
KW - Feature selection
KW - Prior knowledge
KW - Gene expression
KW - Reproducible benchmarking
Y1 - 2021
U6 - https://doi.org/10.1186/s12859-021-04308-z
SN - 1471-2105
VL - 22
SP - 1
EP - 15
PB - Springer Nature
CY - London
ER -
TY - JOUR
A1 - Sagu Tchewonpi, Sorel
A1 - Zimmermann, Lynn
A1 - Landgräber, Eva
A1 - Homann, Thomas
A1 - Huschek, Gerd
A1 - Özpinar, Haydar
A1 - Schweigert, Florian J.
A1 - Rawel, Harshadrai Manilal
T1 - Comprehensive Characterization and Relative Quantification of α-Amylase/Trypsin Inhibitors from Wheat Cultivars by Targeted HPLC-MS/MS
JF - Foods
N2 - The α-amylase/trypsin inhibitors (ATIs) are discussed as being responsible for non-celiac wheat sensitivity (NCWS), besides being known as allergenic components for baker’s asthma. Different approaches for characterization and quantification including proteomics-based methods for wheat ATIs have been documented. In these studies generally the major ATIs have been addressed. The challenge of current study was then to develop a more comprehensive workflow encompassing all reviewed wheat-ATI entries in UniProt database. To substantially test proof of concept, 46 German and Turkish wheat samples were used. Two extractions systems based on chloroform/methanol mixture (CM) and under buffered denaturing conditions were evaluated. Three aspects were optimized, tryptic digestion, chromatographic separation, and targeted tandem mass spectrometric analysis (HPLC-MS/MS). Preliminary characterization with sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) documented the purity of the extracted ATIs with CM mixture and the amylase (60–80%)/trypsin (10–20%) inhibition demonstrated the bifunctional activity of ATIs. Thirteen (individual/common) biomarkers were established. Major ATIs (7–34%) were differently represented in samples. Finally, to our knowledge, the proposed HPLC-MS/MS method allowed for the first time so far the analysis of all 14 reviewed wheat ATI entries reported.
KW - α-amylase/trypsin inhibitors
KW - wheat cultivars
KW - SDS-PAGE
KW - peptides markers
KW - relative quantification
KW - mass spectrometry
KW - LC-MRM-MS
Y1 - 2020
U6 - https://doi.org/10.3390/foods9101448
SN - 2304-8158
VL - 9
IS - 10
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Thieken, Annegret
A1 - Mohor, Guilherme Samprogna
A1 - Kreibich, Heidi
A1 - Müller, Meike
T1 - Compound inland flood events
BT - different pathways, different impacts and different coping options
JF - Natural hazards and earth system sciences : NHESS
N2 - Several severe flood events hit Germany in recent years, with events in 2013 and 2016 being the most destructive ones, although dynamics and flood processes were very different. While the 2013 event was a slowly rising widespread fluvial flood accompanied by some severe dike breaches, the events in 2016 were fast-onset pluvial floods, which resulted in surface water flooding in some places due to limited capacities of the drainage systems and in destructive flash floods with high sediment loads and clogging in others, particularly in small steep catchments. Hence, different pathways, i.e. different routes that the water takes to reach (and potentially damage) receptors, in our case private households, can be identified in both events. They can thus be regarded as spatially compound flood events or compound inland floods. This paper analyses how differently affected residents coped with these different flood types (fluvial and pluvial) and their impacts while accounting for the different pathways (river flood, dike breach, surface water flooding and flash flood) within the compound events. The analyses are based on two data sets with 1652 (for the 2013 flood) and 601 (for the 2016 flood) affected residents who were surveyed around 9 months after each flood, revealing little socio-economic differences - except for income - between the two samples. The four pathways showed significant differences with regard to their hydraulic and financial impacts, recovery, warning processes, and coping and adaptive behaviour. There are just small differences with regard to perceived self-efficacy and responsibility, offering entry points for tailored risk communication and support to improve property-level adaptation.
Y1 - 2022
U6 - https://doi.org/10.5194/nhess-22-165-2022
SN - 1561-8633
SN - 1684-9981
VL - 22
IS - 1
SP - 165
EP - 185
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Weithoff, Guntram
A1 - Bell, Elanor Margaret
T1 - Complex Trophic Interactions in an Acidophilic Microbial Community
JF - Microorganisms
N2 - Extreme habitats often harbor specific communities that differ substantially from non-extreme habitats. In many cases, these communities are characterized by archaea, bacteria and protists, whereas the number of species of metazoa and higher plants is relatively low. In extremely acidic habitats, mostly prokaryotes and protists thrive, and only very few metazoa thrive, for example, rotifers. Since many studies have investigated the physiology and ecology of individual species, there is still a gap in research on direct, trophic interactions among extremophiles. To fill this gap, we experimentally studied the trophic interactions between a predatory protist (Actinophrys sol, Heliozoa) and its prey, the rotifers Elosa woralli and Cephalodella sp., the ciliate Urosomoida sp. and the mixotrophic protist Chlamydomonas acidophila (a green phytoflagellate, Chlorophyta). We found substantial predation pressure on all animal prey. High densities of Chlamydomonas acidophila reduced the predation impact on the rotifers by interfering with the feeding behaviour of A. sol. These trophic relations represent a natural case of intraguild predation, with Chlamydomonas acidophila being the common prey and the rotifers/ciliate and A. sol being the intraguild prey and predator, respectively. We further studied this intraguild predation along a resource gradient using Cephalodella sp. as the intraguild prey. The interactions among the three species led to an increase in relative rotifer abundance with increasing resource (Chlamydomonas) densities. By applying a series of laboratory experiments, we revealed the complexity of trophic interactions within a natural extremophilic community.
KW - acid mine drainage
KW - extremophiles
KW - food web
KW - heliozoa
KW - intraguild predation
KW - mining lakes
KW - Rotifera
Y1 - 2022
U6 - https://doi.org/10.3390/microorganisms10071340
SN - 2076-2607
VL - 10
SP - 1
EP - 10
PB - MDPI
CY - Basel, Schweiz
ET - 7
ER -
TY - JOUR
A1 - Wiesner, Karoline
A1 - Ladyman, James
T1 - Complex systems are always correlated but rarely information processing
JF - Journal of physics. Complexity
N2 - 'Complex systems are information processors' is a statement that is frequently made. Here we argue for the distinction between information processing-in the sense of encoding and transmitting a symbolic representation-and the formation of correlations (pattern formation/self-organisation). The study of both uses tools from information theory, but the purpose is very different in each case: explaining the mechanisms and understanding the purpose or function in the first case, versus data analysis and correlation extraction in the latter. We give examples of both and discuss some open questions. The distinction helps focus research efforts on the relevant questions in each case.
KW - correlations
KW - information theory
KW - complex systems
KW - information
KW - processing
KW - self-organisation
Y1 - 2021
U6 - https://doi.org/10.1088/2632-072X/ac371c
SN - 2632-072X
VL - 2
IS - 4
PB - IOP Publ. Ltd.
CY - Bristol
ER -
TY - JOUR
A1 - Wieczorek, Mareike
A1 - Herzschuh, Ulrike
T1 - Compilation of relative pollen productivity (RPP) estimates and taxonomically harmonised RPP datasets for single continents and Northern Hemisphere extratropics
JF - Earth system science data : ESSD
N2 - Relative pollen productivity (RPP) estimates are fractionate values, often in relation to Poaceae, that allow vegetation cover to be estimated from pollen counts with the help of models. RPP estimates are especially used in the scientific community in Europe and China, with a few studies in North America. Here we present a comprehensive compilation of available northern hemispheric RPP studies and their results arising from 51 publications with 60 sites and 131 taxa. This compilation allows scientists to identify data gaps in need of further RPP analyses but can also aid them in finding an RPP set for their study region. We also present a taxonomically harmonised, unified RPP dataset for the Northern Hemisphere and subsets for North America (including Greenland), Europe (including arctic Russia), and China, which we generated from the available studies. The unified dataset gives the mean RPP for 55 harmonised taxa as well as fall speeds, which are necessary to reconstruct vegetation cover from pollen counts and RPP values. Data are openly available at https://doi.org/10.1594/PANGAEA.922661 (Wieczorek and Herzschuh, 2020).
Y1 - 2020
U6 - https://doi.org/10.5194/essd-12-3515-2020
SN - 1866-3508
SN - 1866-3516
VL - 12
IS - 4
SP - 3515
EP - 3528
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Naseri, Gita
A1 - Behrend, Jessica
A1 - Rieper, Lisa
A1 - Müller-Röber, Bernd
T1 - COMPASS for rapid combinatorial optimization of biochemical pathways based on artificial transcription factors
JF - Nature Communications
N2 - Balanced expression of multiple genes is central for establishing new biosynthetic pathways or multiprotein cellular complexes. Methods for efficient combinatorial assembly of regulatory sequences (promoters) and protein coding sequences are therefore highly wanted. Here, we report a high-throughput cloning method, called COMPASS for COMbinatorial Pathway ASSembly, for the balanced expression of multiple genes in Saccharomyces cerevisiae. COMPASS employs orthogonal, plant-derived artificial transcription factors (ATFs) and homologous recombination-based cloning for the generation of thousands of individual DNA constructs in parallel. The method relies on a positive selection of correctly assembled pathway variants from both, in vivo and in vitro cloning procedures. To decrease the turnaround time in genomic engineering, COMPASS is equipped with multi-locus CRISPR/Cas9-mediated modification capacity. We demonstrate the application of COMPASS by generating cell libraries producing n-carotene and co-producing p-ionone and biosensor-responsive naringenin. COMPASS will have many applications in synthetic biology projects that require gene expression balancing.
Y1 - 2019
U6 - https://doi.org/10.1038/s41467-019-10224-x
SN - 2041-1723
VL - 10
PB - Nature Publ. Group
CY - London
ER -
TY - JOUR
A1 - Hohaus, Vera
A1 - Zimmermann, Malte
T1 - Comparisons of equality with German so ... wie, and the relationship between degrees and properties
JF - Journal of semantics
N2 - We present a compositionally transparent, unified semantic analysis of two kinds of so ... wie-equative constructions in German, namely degree equatives and property equatives in the domain of individuals or events. Unlike in English and many other European languages (Haspelmath & Buchholz 1998, Rett 2013), both equative types in German feature the parameter marker so, suggesting a unified analysis. We show that the parallel formal expression of German degree and property equatives is accompanied by a parallel syntactic distribution (in predicative, attributive, and adverbial position), and by identical semantic properties: Both equative types allow for scope ambiguities, show negative island effects out of context, and license the negative polarity item uberhaupt 'at all' in the complement clause. As the same properties are also shared by German comparatives, we adopt the influential quantificational analysis of comparatives in von Stechow (1984ab), Heim (1985, 2001, 2007), and Beck (2011), and treat both German equative types in a uniform manner as expressing universal quantification over sets of degrees or over sets of properties (of individuals or events). Conceptually, the uniform marking of degree-related and property-related meanings is expected given that the abstract semantic category degree (type ) can be reconstructed in terms of equivalence classes, i.e., ontologically simpler sets of individuals (type ) or events (type ). These are found in any language, showing that whether or not a language makes explicit reference to degrees (by means of gradable adjectives, degree question words, degree-only equatives) does not follow on general conceptual or semantic grounds, but is determined by the grammar of that language.
Y1 - 2021
U6 - https://doi.org/10.1093/jos/ffaa011
SN - 0167-5133
SN - 1477-4593
VL - 38
IS - 1
SP - 95
EP - 143
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Coch, Caroline
A1 - Juhls, Bennet
A1 - Lamoureux, Scott F.
A1 - Lafreniere, Melissa J.
A1 - Fritz, Michael
A1 - Heim, Birgit
A1 - Lantuit, Hugues
T1 - Comparisons of dissolved organic matter and its optical characteristics in small low and high Arctic catchments
JF - Biogeosciences
N2 - Climate change is affecting the rate of carbon cycling, particularly in the Arctic. Permafrost degradation through deeper thaw and physical disturbances results in the release of carbon dioxide and methane to the atmosphere and to an increase in lateral dissolved organic matter (DOM) fluxes. Whereas riverine DOM fluxes of the large Arctic rivers are well assessed, knowledge is limited with regard to small catchments that cover more than 40% of the Arctic drainage basin. Here, we use absorption measurements to characterize changes in DOM quantity and quality in a low Arctic (Herschel Island, Yukon, Canada) and a high Arctic (Cape Bounty, Melville Island, Nunavut, Canada) setting with regard to geographical differences, impacts of permafrost degradation, and rainfall events. We find that DOM quantity and quality is controlled by differences in vegetation cover and soil organic carbon content (SOCC). The low Arctic site has higher SOCC and greater abundance of plant material resulting in higher chromophoric dissolved organic matter (cDOM) and dissolved organic carbon (DOC) than in the high Arctic. DOC concentration and cDOM in surface waters at both sites show strong linear relationships similar to the one for the great Arctic rivers. We used the optical characteristics of DOM such as cDOM absorption, specific ultraviolet absorbance (SUVA), ultraviolet (UV) spectral slopes (S275-295), and slope ratio (SR) for assessing quality changes downstream, at base flow and storm flow conditions, and in relation to permafrost disturbance. DOM in streams at both sites demonstrated optical signatures indicative of photodegradation downstream processes, even over short distances of 2000 m. Flow pathways and the connected hydrological residence time control DOM quality. Deeper flow pathways allow the export of permafrost-derived DOM (i.e. from deeper in the active layer), whereas shallow pathways with shorter residence times lead to the export of fresh surface- and near-surface-derived DOM. Compared to the large Arctic rivers, DOM quality exported from the small catchments studied here is much fresher and therefore prone to degradation. Assessing optical properties of DOM and linking them to catchment properties will be a useful tool for understanding changing DOM fluxes and quality at a pan-Arctic scale.
Y1 - 2019
U6 - https://doi.org/10.5194/bg-16-4535-2019
SN - 1726-4170
SN - 1726-4189
VL - 16
IS - 23
SP - 4535
EP - 4553
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Sobhkhiz-Miandehi, Sahar
A1 - Yamazaki, Yosuke
A1 - Arras, Christina
A1 - Miyoshi, Yasunobu
A1 - Shinagawa, Hiroyuki
T1 - Comparison of the tidal signatures in sporadic E and vertical ion convergence rate, using FORMOSAT-3/COSMIC radio occultation observations and GAIA model
JF - Earth, planets and space : EPS
N2 - Sporadic E or Es is a transient phenomenon where thin layers of enhanced electron density appear in the ionospheric E region (90-120 km altitude). The neutral wind shear caused by atmospheric tides can lead ions to converge vertically at E-region heights and form the Es layer. This research aims to determine the role of atmospheric solar and lunar tides in Es occurrence. For this purpose, radio occultation data of FORMOSAT-3/COSMIC have been used, which provide complete global coverage of Es events. Moreover, GAIA model simulations have been employed to evaluate the vertical ion convergence induced by solar tides. The results show both migrating and non-migrating solar tidal signatures and the semidiurnal migrating lunar tidal signature mainly in low and mid-latitude Es occurrence. The seasonal variation of the migrating solar tidal components of Es is in good agreement with those in the vertical ion convergence derived from GAIA at higher altitudes. Furthermore, some non-migrating components of solar tides, including semidiurnal westward wavenumbers 1 and 3 and diurnal eastward wavenumbers 2 and 3, also significantly affect the Es occurrence rate.
KW - Sporadic E
KW - Es
KW - wind shear
KW - solar tide
KW - lunar tide
KW - GAIA
KW - radio occultation
Y1 - 2022
U6 - https://doi.org/10.1186/s40623-022-01637-y
SN - 1880-5981
VL - 74
IS - 1
PB - Springer
CY - Heidelberg
ER -
TY - JOUR
A1 - Javhar, Aminov
A1 - Chen, Xi
A1 - Bao, Anming
A1 - Jamshed, Aminov
A1 - Yunus, Mamadjanov
A1 - Jovid, Aminov
A1 - Latipa, Tuerhanjiang
T1 - Comparison of Multi-Resolution Optical Landsat-8, Sentinel-2 and Radar Sentinel-1 Data for Automatic Lineament Extraction
BT - A Case Study of Alichur Area, SE Pamir
JF - Remote sensing
N2 - Lineament mapping, which is an important part of any structural geological investigation, is made more efficient and easier by the availability of optical as well as radar remote sensing data, such as Landsat and Sentinel with medium and high spatial resolutions. However, the results from these multi-resolution data vary due to their difference in spatial resolution and sensitivity to soil occupation. The accuracy and quality of extracted lineaments depend strongly on the spatial resolution of the imagery. Therefore, the aim of this study was to compare the optical Landsat-8, Sentinel-2A, and radar Sentinel-1A satellite data for automatic lineament extraction. The framework of automatic approach includes defining the optimal parameters for automatic lineament extraction with a combination of edge detection and line-linking algorithms and determining suitable bands from optical data suited for lineament mapping in the study area. For the result validation, the extracted lineaments are compared against the manually obtained lineaments through the application of directional filtering and edge enhancement as well as to the lineaments digitized from the existing geological maps of the study area. In addition, a digital elevation model (DEM) has been utilized for an accuracy assessment followed by the field verification. The obtained results show that the best correlation between automatically extracted lineaments, manual interpretation, and the preexisting lineament map is achieved from the radar Sentinel-1A images. The tests indicate that the radar data used in this study, with 5872 and 5865 lineaments extracted from VH and VV polarizations respectively, is more efficient for structural lineament mapping than the Landsat-8 and Sentinel-2A optical imagery, from which 2338 and 4745 lineaments were extracted respectively.
KW - image enhancement
KW - automatic lineament extraction
KW - Landsat-8
KW - Sentinel-1
KW - Sentinel-2
KW - structural mapping
Y1 - 2019
U6 - https://doi.org/10.3390/rs11070778
SN - 2072-4292
VL - 11
IS - 7
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Ringel, Lisa Maria
A1 - Somogyvári, Márk
A1 - Jalali, Mohammadreza
A1 - Bayer, Peter
T1 - Comparison of hydraulic and tracer tomography for discrete fracture network inversion
JF - Geosciences
N2 - Fractures serve as highly conductive preferential flow paths for fluids in rocks, which are difficult to exactly reconstruct in numerical models. Especially, in low-conductive rocks, fractures are often the only pathways for advection of solutes and heat. The presented study compares the results from hydraulic and tracer tomography applied to invert a theoretical discrete fracture network (DFN) that is based on data from synthetic cross-well testing. For hydraulic tomography, pressure pulses in various injection intervals are induced and the pressure responses in the monitoring intervals of a nearby observation well are recorded. For tracer tomography, a conservative tracer is injected in different well levels and the depth-dependent breakthrough of the tracer is monitored. A recently introduced transdimensional Bayesian inversion procedure is applied for both tomographical methods, which adjusts the fracture positions, orientations, and numbers based on given geometrical fracture statistics. The used Metropolis-Hastings-Green algorithm is refined by the simultaneous estimation of the measurement error’s variance, that is, the measurement noise. Based on the presented application to invert the two-dimensional cross-section between source and the receiver well, the hydraulic tomography reveals itself to be more suitable for reconstructing the original DFN. This is based on a probabilistic representation of the inverted results by means of fracture probabilities.
KW - hydraulic tomography
KW - tracer tomography
KW - DFN
KW - Bayesian inversion
KW - heterogeneity
KW - fracture
KW - hydrogeophysics
Y1 - 2019
U6 - https://doi.org/10.3390/geosciences9060274
SN - 2076-3263
VL - 9
IS - 6
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Brinkmann, Pia
A1 - Köllner, Nicole
A1 - Merk, Sven
A1 - Beitz, Toralf
A1 - Altenberger, Uwe
A1 - Löhmannsröben, Hans-Gerd
T1 - Comparison of handheld and echelle spectrometer to assess copper in ores by means of laser-induced breakdown spectroscopy (LIBS)
JF - Minerals
N2 - Its properties make copper one of the world’s most important functional metals. Numerous megatrends are increasing the demand for copper. This requires the prospection and exploration of new deposits, as well as the monitoring of copper quality in the various production steps. A promising technique to perform these tasks is Laser Induced Breakdown Spectroscopy (LIBS). Its unique feature, among others, is the ability to measure on site without sample collection and preparation. In this work, copper-bearing minerals from two different deposits are studied. The first set of field samples come from a volcanogenic massive sulfide (VMS) deposit, the second part from a stratiform sedimentary copper (SSC) deposit. Different approaches are used to analyze the data. First, univariate regression (UVR) is used. However, due to the strong influence of matrix effects, this is not suitable for the quantitative analysis of copper grades. Second, the multivariate method of partial least squares regression (PLSR) is used, which is more suitable for quantification. In addition, the effects of the surrounding matrices on the LIBS data are characterized by principal component analysis (PCA), alternative regression methods to PLSR are tested and the PLSR calibration is validated using field samples.
KW - LIBS
KW - copper-bearing minerals
KW - UVR
KW - PCA
KW - PLSR
Y1 - 2023
U6 - https://doi.org/10.3390/min13010113
SN - 2075-163X
VL - 13
IS - 1
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Gärtner, Thomas
A1 - Schneider, Juliana
A1 - Arnrich, Bert
A1 - Konigorski, Stefan
T1 - Comparison of Bayesian Networks, G-estimation and linear models to estimate causal treatment effects in aggregated N-of-1 trials with carry-over effects
JF - BMC Medical Research Methodology
N2 - Background
The aggregation of a series of N-of-1 trials presents an innovative and efficient study design, as an alternative to traditional randomized clinical trials. Challenges for the statistical analysis arise when there is carry-over or complex dependencies of the treatment effect of interest.
Methods
In this study, we evaluate and compare methods for the analysis of aggregated N-of-1 trials in different scenarios with carry-over and complex dependencies of treatment effects on covariates. For this, we simulate data of a series of N-of-1 trials for Chronic Nonspecific Low Back Pain based on assumed causal relationships parameterized by directed acyclic graphs. In addition to existing statistical methods such as regression models, Bayesian Networks, and G-estimation, we introduce a carry-over adjusted parametric model (COAPM).
Results
The results show that all evaluated existing models have a good performance when there is no carry-over and no treatment dependence. When there is carry-over, COAPM yields unbiased and more efficient estimates while all other methods show some bias in the estimation. When there is known treatment dependence, all approaches that are capable to model it yield unbiased estimates. Finally, the efficiency of all methods decreases slightly when there are missing values, and the bias in the estimates can also increase.
Conclusions
This study presents a systematic evaluation of existing and novel approaches for the statistical analysis of a series of N-of-1 trials. We derive practical recommendations which methods may be best in which scenarios.
KW - N-of-1 trials
KW - Randomized clinical trials
KW - Bayesian Networks;
KW - G-estimation
KW - Linear model
KW - Simulation study
KW - Chronic Nonspecific Low
KW - Back Pain
Y1 - 2023
U6 - https://doi.org/10.1186/s12874-023-02012-5
SN - 1471-2288
VL - 23
IS - 1
PB - BMC
CY - London
ER -
TY - JOUR
A1 - Figueroa Campos, Gustavo A.
A1 - Sagu Tchewonpi, Sorel
A1 - Saravia Celis, Pedro
A1 - Rawel, Harshadrai Manilal
T1 - Comparison of batch and continuous wet-processing of coffee
BT - changes in the main compounds in beans, by-products and wastewater
JF - Foods
N2 - Many technical challenges still need to be overcome to improve the quality of the green coffee beans. In this work, the wet Arabica coffee processing in batch and continuous modus were investigated. Coffee beans samples as well as by-products and wastewaters collected at different production steps were analyzed in terms of their content in total phenols, antioxidant capacity, caffeine content, organic acids, reducing sugars, free amino group and protein content. The results showed that 40% of caffeine was removed with pulp. Green coffee beans showed highest concentration of organic acids and sucrose (4.96 ± 0.25 and 5.07 ± 0.39 g/100 g DW for the batch and continuous processing). Batch green coffee beans contained higher amount of phenols. 5-caffeoylquinic Acid (5-CQA) was the main constituent (67.1 and 66.0% for the batch and continuous processing, respectively). Protein content was 15 and 13% in the green coffee bean in batch and continuous processing, respectively. A decrease of 50 to 64% for free amino groups during processing was observed resulting in final amounts of 0.8 to 1.4% in the processed beans. Finally, the batch processing still revealed by-products and wastewater with high nutrient content encouraging a better concept for valorization.
KW - Arabica coffee beans
KW - coffee by-products
KW - batch process
KW - continuous process
KW - nutritional characteristics
Y1 - 2020
U6 - https://doi.org/10.3390/foods9081135
SN - 2304-8158
VL - 9
IS - 8
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Braun, Jean
T1 - Comparing the transport-limited and ξ-q models for sediment transport
JF - Earth surface dynamics
N2 - Here I present a comparison between two of the most widely used reduced-complexity models for the representation of sediment transport and deposition processes, namely the transport-limited (or TL) model and the under-capacity (or xi-q) model more recently developed by Davy and Lague (2009). Using both models, I investigate the behavior of a sedimentary continental system of length L fed by a fixed sedimentary flux from a catchment of size A(0) in a nearby active orogen through which sediments transit to a fixed base level representing a large river, a lake or an ocean. This comparison shows that the two models share the same steady-state solution, for which I derive a simple 1D analytical expression that reproduces the major features of such sedimentary systems: a steep fan that connects to a shallower alluvial plain. The resulting fan geometry obeys basic observational constraints on fan size and slope with respect to the upstream drainage area, A(0). The solution is strongly dependent on the size of the system, L, in comparison to a distance L-0, which is determined by the size of A(0), and gives rise to two fundamentally different types of sedimentary systems: a constrained system where L < L-0 and open systems where L > L-0. I derive simple expressions that show the dependence of the system response time on the system characteristics, such as its length, the size of the upstream catchment area, the amplitude of the incoming sedimentary flux and the respective rate parameters (diffusivity or erodibility) for each of the two models. I show that the xi-q model predicts longer response times. I demonstrate that although the manner in which signals propagates through the sedimentary system differs greatly between the two models, they both predict that perturbations that last longer than the response time of the system can be recorded in the stratigraphy of the sedimentary system and in particular of the fan. Interestingly, the xi-q model predicts that all perturbations in the incoming sedimentary flux will be transmitted through the system, whereas the TL model predicts that rapid perturbations cannot. I finally discuss why and under which conditions these differences are important and propose observational ways to determine which of the two models is most appropriate to represent natural systems.
Y1 - 2022
U6 - https://doi.org/10.5194/esurf-10-301-2022
SN - 2196-6311
SN - 2196-632X
VL - 10
IS - 2
SP - 301
EP - 327
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Potente, Giacomo
A1 - Léveillé-Bourret, Étienne
A1 - Yousefi, Narjes
A1 - Choudhury, Rimjhim Roy
A1 - Keller, Barbara
A1 - Diop, Seydina Issa
A1 - Duijsings, Daniël
A1 - Pirovano, Walter
A1 - Lenhard, Michael
A1 - Szövényi, Péter
A1 - Conti, Elena
T1 - Comparative genomics elucidates the origin of a supergene controlling floral heteromorphism
JF - Molecular biology and evolution : MBE
N2 - Supergenes are nonrecombining genomic regions ensuring the coinheritance of multiple, coadapted genes. Despite the importance of supergenes in adaptation, little is known on how they originate. A classic example of supergene is the S locus controlling heterostyly, a floral heteromorphism occurring in 28 angiosperm families. In Primula, heterostyly is characterized by the cooccurrence of two complementary, self-incompatible floral morphs and is controlled by five genes clustered in the hemizygous, ca. 300-kb S locus. Here, we present the first chromosome-scale genome assembly of any heterostylous species, that of Primula veris (cowslip). By leveraging the high contiguity of the P. veris assembly and comparative genomic analyses, we demonstrated that the S-locus evolved via multiple, asynchronous gene duplications and independent gene translocations. Furthermore, we discovered a new whole-genome duplication in Ericales that is specific to the Primula lineage. We also propose a mechanism for the origin of S-locus hemizygosity via nonhomologous recombination involving the newly discovered two pairs of CFB genes flanking the S locus. Finally, we detected only weak signatures of degeneration in the S locus, as predicted for hemizygous supergenes. The present study provides a useful resource for future research addressing key questions on the evolution of supergenes in general and the S locus in particular: How do supergenes arise? What is the role of genome architecture in the evolution of complex adaptations? Is the molecular architecture of heterostyly supergenes across angiosperms similar to that of Primula?
KW - genome architecture
KW - supergene
KW - heterostyly
KW - evolutionary genomics
KW - chromosome-scale genome assembly
KW - primula
Y1 - 2022
U6 - https://doi.org/10.1093/molbev/msac035
SN - 0737-4038
SN - 1537-1719
VL - 39
IS - 2
PB - Oxford Univ. Press
CY - Oxford
ER -
TY - JOUR
A1 - Lyall, Rafe
A1 - Nikoloski, Zoran
A1 - Gechev, Tsanko
T1 - Comparative analysis of ROS network genes in extremophile Eukaryotes
JF - International journal of molecular sciences
N2 - The reactive oxygen species (ROS) gene network, consisting of both ROS-generating and detoxifying enzymes, adjusts ROS levels in response to various stimuli. We performed a cross-kingdom comparison of ROS gene networks to investigate how they have evolved across all Eukaryotes, including protists, fungi, plants and animals. We included the genomes of 16 extremotolerant Eukaryotes to gain insight into ROS gene evolution in organisms that experience extreme stress conditions. Our analysis focused on ROS genes found in all Eukaryotes (such as catalases, superoxide dismutases, glutathione reductases, peroxidases and glutathione peroxidase/peroxiredoxins) as well as those specific to certain groups, such as ascorbate peroxidases, dehydroascorbate/monodehydroascorbate reductases in plants and other photosynthetic organisms. ROS-producing NADPH oxidases (NOX) were found in most multicellular organisms, although several NOX-like genes were identified in unicellular or filamentous species. However, despite the extreme conditions experienced by extremophile species, we found no evidence for expansion of ROS-related gene families in these species compared to other Eukaryotes. Tardigrades and rotifers do show ROS gene expansions that could be related to their extreme lifestyles, although a high rate of lineage-specific horizontal gene transfer events, coupled with recent tetraploidy in rotifers, could explain this observation. This suggests that the basal Eukaryotic ROS scavenging systems are sufficient to maintain ROS homeostasis even under the most extreme conditions.
KW - ROS
KW - extremotolerance
KW - resurrection plants
Y1 - 2020
U6 - https://doi.org/10.3390/ijms21239131
SN - 1422-0067
VL - 21
IS - 23
PB - Molecular Diversity Preservation International (MDPI)
CY - Basel
ER -
TY - JOUR
A1 - Gottschalk, Matthias
T1 - Company of Heroes und Company of Heroes 2
JF - „Wir alle treffen Entscheidungen im Leben, aber letztendlich treffen unsere Entscheidungen uns.“ : didaktische Potenziale digitaler Spielwelten
Y1 - 2020
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-485680
SN - 978-3-86956-489-0
SP - 143
EP - 158
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Kühne, Franziska
A1 - Fauth, Henriette
A1 - Destina Sevde, Ay-Bryson
A1 - Visser, Leonie N.C.
A1 - Weck, Florian
T1 - Communicating the diagnosis of cancer or depression: Results of a randomized controlled online study using video vignettes
JF - Cancer Medicine
N2 - Background
Communicating a diagnosis is highly important, yet complex, especially in the context of cancer and mental disorders. The aim was to explore the communication style of an oncologist vs. psychotherapist in an online study.
Methods
Patients (N = 136: 65 cancer, 71 depression) were randomly assigned to watch a standardized video vignette with one of two communication styles (empathic vs. unempathic). Outcome measures of affectivity, information recall, communication skills, empathy and trust were applied.
Results
Regardless of diagnosis, empathic communication was associated with the perception of a significantly more empathic (p < 0.001, η2partial = 0.08) and trustworthy practitioner (p = 0.014, η2partial = 0.04) with better communication skills (p = 0.013, η2partial = 0.05). Cancer patients reported a larger decrease in positive affect (p < 0.001, η2partial = 0.15) and a larger increase in negative affect (p < 0.001, η2partial = 0.14) from pre- to post-video than depressive patients. Highly relevant information was recalled better in both groups (p < 0.001, d = 0.61–1.06).
Conclusions
The results highlight the importance of empathy while communicating both a diagnosis of cancer and a mental disorder. Further research should focus on the communication of a mental disorder in association with cancer.
KW - consultation
KW - mental health
KW - oncology
KW - psycho-oncology
KW - skills
Y1 - 2021
U6 - https://doi.org/10.1002/cam4.4396
SN - 2045-7634
VL - 10
SP - 9012
EP - 9021
PB - Wiley
CY - Hoboken, New Jersey, USA
ET - 24
ER -
TY - JOUR
A1 - Richter, Maria
A1 - Paul, Mariella
A1 - Höhle, Barbara
A1 - Wartenburger, Isabell
T1 - Common Ground Information Affects Reference Resolution
BT - Evidence From Behavioral Data, ERPs, and Eye-Tracking
JF - Frontiers in Psychology
N2 - One of the most important social cognitive skills in humans is the ability to “put oneself in someone else’s shoes,” that is, to take another person’s perspective. In socially situated communication, perspective taking enables the listener to arrive at a meaningful interpretation of what is said (sentence meaning) and what is meant (speaker’s meaning) by the speaker. To successfully decode the speaker’s meaning, the listener has to take into account which information he/she and the speaker share in their common ground (CG). We here further investigated competing accounts about when and how CG information affects language comprehension by means of reaction time (RT) measures, accuracy data, event-related potentials (ERPs), and eye-tracking. Early integration accounts would predict that CG information is considered immediately and would hence not expect to find costs of CG integration. Late integration accounts would predict a rather late and effortful integration of CG information during the parsing process that might be reflected in integration or updating costs. Other accounts predict the simultaneous integration of privileged ground (PG) and CG perspectives. We used a computerized version of the referential communication game with object triplets of different sizes presented visually in CG or PG. In critical trials (i.e., conflict trials), CG information had to be integrated while privileged information had to be suppressed. Listeners mastered the integration of CG (response accuracy 99.8%). Yet, slower RTs, and enhanced late positivities in the ERPs showed that CG integration had its costs. Moreover, eye-tracking data indicated an early anticipation of referents in CG but an inability to suppress looks to the privileged competitor, resulting in later and longer looks to targets in those trials, in which CG information had to be considered. Our data therefore support accounts that foresee an early anticipation of referents to be in CG but a rather late and effortful integration if conflicting information has to be processed. We show that both perspectives, PG and CG, contribute to socially situated language processing and discuss the data with reference to theoretical accounts and recent findings on the use of CG information for reference resolution.
KW - perspective-taking
KW - ERPs
KW - eye-tracking
KW - common ground
KW - privileged ground
Y1 - 2020
U6 - https://doi.org/10.3389/fpsyg.2020.565651
SN - 1664-1078
VL - 11
PB - Frontiers Research Foundation
CY - Lausanne
ER -
TY - JOUR
A1 - Wendering, Philipp
A1 - Nikoloski, Zoran
T1 - COMMIT
BT - Consideration of metabolite leakage and community composition improves microbial community reconstructions
JF - PLoS Computational Biology : a new community journal / publ. by the Public Library of Science (PLoS) in association with the International Society for Computational Biology (ISCB)
N2 - Composition and functions of microbial communities affect important traits in diverse hosts, from crops to humans. Yet, mechanistic understanding of how metabolism of individual microbes is affected by the community composition and metabolite leakage is lacking. Here, we first show that the consensus of automatically generated metabolic reconstructions improves the quality of the draft reconstructions, measured by comparison to reference models. We then devise an approach for gap filling, termed COMMIT, that considers metabolites for secretion based on their permeability and the composition of the community. By applying COMMIT with two soil communities from the Arabidopsis thaliana culture collection, we could significantly reduce the gap-filling solution in comparison to filling gaps in individual reconstructions without affecting the genomic support. Inspection of the metabolic interactions in the soil communities allows us to identify microbes with community roles of helpers and beneficiaries. Therefore, COMMIT offers a versatile fully automated solution for large-scale modelling of microbial communities for diverse biotechnological applications.
Author summaryMicrobial communities are important in ecology, human health, and crop productivity. However, detailed information on the interactions within natural microbial communities is hampered by the community size, lack of detailed information on the biochemistry of single organisms, and the complexity of interactions between community members. Metabolic models are comprised of biochemical reaction networks based on the genome annotation, and can provide mechanistic insights into community functions. Previous analyses of microbial community models have been performed with high-quality reference models or models generated using a single reconstruction pipeline. However, these models do not contain information on the composition of the community that determines the metabolites exchanged between the community members. In addition, the quality of metabolic models is affected by the reconstruction approach used, with direct consequences on the inferred interactions between community members. Here, we use fully automated consensus reconstructions from four approaches to arrive at functional models with improved genomic support while considering the community composition. We applied our pipeline to two soil communities from the Arabidopsis thaliana culture collection, providing only genome sequences. Finally, we show that the obtained models have 90% genomic support and demonstrate that the derived interactions are corroborated by independent computational predictions.
Y1 - 2022
U6 - https://doi.org/10.1371/journal.pcbi.1009906
SN - 1553-734X
SN - 1553-7358
VL - 18
IS - 3
PB - Public Library of Science
CY - San Fransisco
ER -
TY - JOUR
A1 - de Carvalho Souza, Alyson Matheus
A1 - Barrocas, Roberta
A1 - Fischer, Martin H.
A1 - Arnaud, Emanuel
A1 - Moeller, Korbinian
A1 - Rennó-Costa, César
T1 - Combining virtual reality and tactile stimulation to investigate embodied finger-based numerical representations
JF - Frontiers in psychology / Frontiers Research Foundation
N2 - Finger-based representation of numbers is a high-level cognitive strategy to assist numerical and arithmetic processing in children and adults. It is unclear whether this paradigm builds on simple perceptual features or comprises several attributes through embodiment. Here we describe the development and initial testing of an experimental setup to study embodiment during a finger-based numerical task using Virtual Reality (VR) and a low-cost tactile stimulator that is easy to build. Using VR allows us to create new ways to study finger-based numerical representation using a virtual hand that can be manipulated in ways our hand cannot, such as decoupling tactile and visual stimuli. The goal is to present a new methodology that can allow researchers to study embodiment through this new approach, maybe shedding new light on the cognitive strategy behind the finger-based representation of numbers. In this case, a critical methodological requirement is delivering precisely targeted sensory stimuli to specific effectors while simultaneously recording their behavior and engaging the participant in a simulated experience. We tested the device's capability by stimulating users in different experimental configurations. Results indicate that our device delivers reliable tactile stimulation to all fingers of a participant's hand without losing motion tracking quality during an ongoing task. This is reflected by an accuracy of over 95% in participants detecting stimulation of a single finger or multiple fingers in sequential stimulation as indicated by experiments with sixteen participants. We discuss possible application scenarios, explain how to apply our methodology to study the embodiment of finger-based numerical representations and other high-level cognitive functions, and discuss potential further developments of the device based on the data obtained in our testing.
KW - virtual reality
KW - numerical cognition
KW - finger counting
KW - embodied cognition
KW - cognitive science
KW - virtual environment
Y1 - 2023
U6 - https://doi.org/10.3389/fpsyg.2023.1119561
SN - 1664-1078
VL - 14
PB - Frontiers Research Foundation
CY - Lausanne
ER -
TY - JOUR
A1 - Soergel, Bjoern
A1 - Kriegler, Elmar
A1 - Bodirsky, Benjamin Leon
A1 - Bauer, Nico
A1 - Leimbach, Marian
A1 - Popp, Alexander
T1 - Combining ambitious climate policies with efforts to eradicate poverty
JF - Nature Communications
N2 - Climate change threatens to undermine efforts to eradicate extreme poverty. However, climate policies could impose a financial burden on the global poor through increased energy and food prices. Here, we project poverty rates until 2050 and assess how they are influenced by mitigation policies consistent with the 1.5 degrees C target. A continuation of historical trends will leave 350 million people globally in extreme poverty by 2030. Without progressive redistribution, climate policies would push an additional 50 million people into poverty. However, redistributing the national carbon pricing revenues domestically as an equal-per-capita climate dividend compensates this policy side effect, even leading to a small net reduction of the global poverty headcount (-6 million). An additional international climate finance scheme enables a substantial poverty reduction globally and also in Sub-Saharan Africa. Combining national redistribution with international climate finance thus provides an important entry point to climate policy in developing countries. Ambitious climate policies can negatively impact the global poor by affecting income, food and energy prices. Here, the authors quantify this effect, and show that it can be compensated by national redistribution of the carbon pricing revenues in combination with international climate finance.
Y1 - 2021
U6 - https://doi.org/10.1038/s41467-021-22315-9
SN - 2041-1723
VL - 12
PB - Nature Publishing Group
CY - London
ER -
TY - JOUR
A1 - Prol, Fabricio S.
A1 - Smirnov, Artem G.
A1 - Hoque, M. Mainul
A1 - Shprits, Yuri Y.
T1 - Combined model of topside ionosphere and plasmasphere derived from radio-occultation and Van Allen Probes data
JF - Scientific reports
N2 - In the last years, electron density profile functions characterized by a linear dependence on the scale height showed good results when approximating the topside ionosphere. The performance above 800 km, however, is not yet well investigated.
This study investigates the capability of the semi-Epstein functions to represent electron density profiles from the peak height up to 20,000 km. Electron density observations recorded by the Van Allen Probes were used to resolve the scale height dependence in the plasmasphere.
It was found that the linear dependence of the scale height in the topside ionosphere cannot be directly used to extrapolate profiles above 800 km.
We find that the dependence of scale heights on altitude is quadratic in the plasmasphere. A statistical model of the scale heights is therefore proposed. After combining the topside ionosphere and plasmasphere by a unified model, we have obtained good estimations not only in the profile shapes, but also in the Total Electron Content magnitude and distributions when compared to actual measurements from 2013, 2014, 2016 and 2017.
Our investigation shows that Van Allen Probes can be merged to radio-occultation data to properly represent the upper ionosphere and plasmasphere by means of a semi-Epstein function.
Y1 - 2022
U6 - https://doi.org/10.1038/s41598-022-13302-1
SN - 2045-2322
VL - 12
IS - 1
PB - Macmillan Publishers Limited, part of Springer Nature
CY - London
ER -
TY - JOUR
A1 - Srivastava, Abhishek
A1 - Murugaiyan, Jayaseelan
A1 - Garcia, Juan A. L.
A1 - De Corte, Daniele
A1 - Hoetzinger, Matthias
A1 - Eravci, Murat
A1 - Weise, Christoph
A1 - Kumar, Yadhu
A1 - Roesler, Uwe
A1 - Hahn, Martin W.
A1 - Grossart, Hans-Peter
T1 - Combined Methylome, Transcriptome and Proteome Analyses Document Rapid Acclimatization of a Bacterium to Environmental Changes
JF - Frontiers in Microbiology
N2 - Polynucleobacter asymbioticus strain QLW-P1DMWA-1T represents a group of highly successful heterotrophic ultramicrobacteria that is frequently very abundant (up to 70% of total bacterioplankton) in freshwater habitats across all seven continents. This strain was originally isolated from a shallow Alpine pond characterized by rapid changes in water temperature and elevated UV radiation due to its location at an altitude of 1300 m. To elucidate the strain’s adjustment to fluctuating environmental conditions, we recorded changes occurring in its transcriptomic and proteomic profiles under contrasting experimental conditions by simulating thermal conditions in winter and summer as well as high UV irradiation. To analyze the potential connection between gene expression and regulation via methyl group modification of the genome, we also analyzed its methylome. The methylation pattern differed between the three treatments, pointing to its potential role in differential gene expression. An adaptive process due to evolutionary pressure in the genus was deduced by calculating the ratios of non-synonymous to synonymous substitution rates for 20 Polynucleobacter spp. genomes obtained from geographically diverse isolates. The results indicate purifying selection.
KW - DNA modification
KW - gene expression
KW - freshwater heterotrophic bacteria
KW - UV radiation
KW - purifying selection
Y1 - 2020
U6 - https://doi.org/10.3389/fmicb.2020.544785
SN - 1664-302X
VL - 11
PB - Frontiers Media
CY - Lausanne
ER -
TY - JOUR
A1 - Haber-Pohlmeier, Sabina
A1 - Tötzke, Christian
A1 - Lehmann, E.
A1 - Kardjilov, Nikolay
A1 - Pohlmeier, A.
A1 - Oswald, Sascha
T1 - Combination of magnetic resonance imaging and neutron computed tomography for three-dimensional rhizosphere imaging
JF - Vadose zone journal
N2 - Core Ideas
3D MRI relaxation time maps reflect water mobility in root, rhizosphere, and soil.
3D NCT water content maps of the same plant complement relaxation time maps.
The relaxation time T1 decreases from soil to root, whereas water content increases.
Parameters together indicate modification of rhizosphere pore space by gel phase.
The zone of reduced T1 corresponds to the zone remaining dry after rewetting.
In situ investigations of the rhizosphere require high‐resolution imaging techniques, which allow a look into the optically opaque soil compartment. We present the novel combination of magnetic resonance imaging (MRI) and neutron computed tomography (NCT) to achieve synergistic information such as water mobility in terms of three‐dimensional (3D) relaxation time maps and total water content maps. Besides a stationary MRI scanner for relaxation time mapping, we used a transportable MRI system on site in the NCT facility to capture rhizosphere properties before desiccation and after subsequent rewetting. First, we addressed two questions using water‐filled test capillaries between 0.1 and 5 mm: which root diameters can still be detected by both methods, and to what extent are defined interfaces blurred by these imaging techniques? Going to real root system architecture, we demonstrated the sensitivity of the transportable MRI device by co‐registration with NCT and additional validation using X‐ray computed tomography. Under saturated conditions, we observed for the rhizosphere in situ a zone with shorter T1 relaxation time across a distance of about 1 mm that was not caused by reduced water content, as proven by successive NCT measurements. We conclude that the effective pore size in the pore network had changed, induced by a gel phase. After rewetting, NCT images showed a dry zone persisting while the MRI intensity inside the root increased considerably, indicating water uptake from the surrounding bulk soil through the still hydrophobic rhizosphere. Overall, combining NCT and MRI allows a more detailed analysis of the rhizosphere's functioning.
Y1 - 2019
U6 - https://doi.org/10.2136/vzj2018.09.0166
SN - 1539-1663
VL - 18
IS - 1
PB - Soil Science Society of America
CY - Madison
ER -
TY - JOUR
A1 - Abramova, Olga
A1 - Batzel, Katharina
A1 - Modesti, Daniela
T1 - Collective response to the health crisis among German Twitter users
BT - a structural topic modeling approach
JF - International Journal of Information Management Data Insights
N2 - We used structural topic modeling to analyze over 800,000 German tweets about COVID-19 to answer the questions: What patterns emerge in tweets as a response to a health crisis? And how do topics discussed change over time? The study leans on the goals associated with the health information seeking (GAINS) model, discerning whether a post aims at tackling and eliminating the problem (i.e., problem-focused) or managing the emotions (i.e., emotion-focused); whether it strives to maximize positive outcomes (promotion focus) or to minimize negative outcomes (prevention focus). The findings indicate four clusters salient in public reactions: 1) “Understanding” (problem-promotion); 2) “Action planning” (problem-prevention); 3) “Hope” (emotion-promotion) and 4) “Reassurance” (emotion-prevention). Public communication is volatile over time, and a shift is evidenced from self-centered to community-centered topics within 4.5 weeks. Our study illustrates social media text mining's potential to quickly and efficiently extract public opinions and reactions. Monitoring fears and trending topics enable policymakers to rapidly respond to deviant behavior, like resistive attitudes toward containment measures or deteriorating physical health. Healthcare workers can use the insights to provide mental health services for battling anxiety or extensive loneliness from staying home.
KW - social media
KW - Twitter
KW - modeling
KW - regulatory focus theory
KW - crisis management
KW - text mining
Y1 - 2022
U6 - https://doi.org/10.1016/j.jjimei.2022.100126
SN - 2667-0968
VL - 2
IS - 2
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Tönjes, Ralf
A1 - Fiore, Carlos E.
A1 - Pereira da Silva, Tiago
T1 - Coherence resonance in influencer networks
JF - Nature Communications
N2 - Complex networks are abundant in nature and many share an important structural property: they contain a few nodes that are abnormally highly connected (hubs). Some of these hubs are called influencers because they couple strongly to the network and play fundamental dynamical and structural roles. Strikingly, despite the abundance of networks with influencers, little is known about their response to stochastic forcing. Here, for oscillatory dynamics on influencer networks, we show that subjecting influencers to an optimal intensity of noise can result in enhanced network synchronization. This new network dynamical effect, which we call coherence resonance in influencer networks, emerges from a synergy between network structure and stochasticity and is highly nonlinear, vanishing when the noise is too weak or too strong. Our results reveal that the influencer backbone can sharply increase the dynamical response in complex systems of coupled oscillators. Influencer networks include a small set of highly-connected nodes and can reach synchrony only via strong node interaction. Tonjes et al. show that introducing an optimal amount of noise enhances synchronization of such networks, which may be relevant for neuroscience or opinion dynamics applications.
Y1 - 2021
U6 - https://doi.org/10.1038/s41467-020-20441-4
SN - 2041-1723
VL - 12
IS - 1
PB - Nature Publishing Group UK
CY - London
ER -
TY - JOUR
A1 - Topali, Paraskevi
A1 - Chounta, Irene-Angelica
A1 - Ortega-Arranz, Alejandro
A1 - Villagrá-Sobrino, Sara L.
A1 - Martínez-Monés, Alejandra
T1 - CoFeeMOOC-v.2
BT - Designing Contingent Feedback for Massive Open Online Courses
JF - EMOOCs 2021
N2 - Providing adequate support to MOOC participants is often a challenging task due to massiveness of the learners’ population and the asynchronous communication among peers and MOOC practitioners. This workshop aims at discussing common learners’ problems reported in the literature and reflect on designing adequate feedback interventions with the use of learning data. Our aim is three-fold: a) to pinpoint MOOC aspects that impact the planning of feedback, b) to explore the use of learning data in designing feedback strategies, and c) to propose design guidelines for developing and delivering scaffolding interventions for personalized feedback in MOOCs. To do so, we will carry out hands-on activities that aim to involve participants in interpreting learning data and using them to design adaptive feedback. This workshop appeals to researchers, practitioners and MOOC stakeholders who aim to providing contextualized scaffolding. We envision that this workshop will provide insights for bridging the gap between pedagogical theory and practice when it comes to feedback interventions in MOOCs.
Y1 - 2021
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-517241
SN - 978-3-86956-512-5
VL - 2021
SP - 209
EP - 217
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Banerjee, Pallavi
A1 - Lipowsky, Reinhard
A1 - Santer, Mark
T1 - Coarse-grained molecular model for the Glycosylphosphatidylinositol anchor with and without protein
JF - Journal of Chemical Theory and Computation
N2 - Glycosylphosphatidylinositol (GPI) anchors are a unique class of complex glycolipids that anchor a great variety of proteins to the extracellular leaflet of plasma membranes of eukaryotic cells. These anchors can exist either with or without an attached protein called GPI-anchored protein (GPI-AP) both in vitro and in vivo. Although GPIs are known to participate in a broad range of cellular functions, it is to a large extent unknown how these are related to GPI structure and composition. Their conformational flexibility and microheterogeneity make it difficult to study them experimentally. Simplified atomistic models are amenable to all-atom computer simulations in small lipid bilayer patches but not suitable for studying their partitioning and trafficking in complex and heterogeneous membranes. Here, we present a coarse-grained model of the GPI anchor constructed with a modified version of the MARTINI force field that is suited for modeling carbohydrates, proteins, and lipids in an aqueous environment using MARTINI's polarizable water. The nonbonded interactions for sugars were reparametrized by calculating their partitioning free energies between polar and apolar phases. In addition, sugar-sugar interactions were optimized by adjusting the second virial coefficients of osmotic pressures for solutions of glucose, sucrose, and trehalose to match with experimental data. With respect to the conformational dynamics of GPI-anchored green fluorescent protein, the accessible time scales are now at least an order of magnitude larger than for the all-atom system. This is particularly important for fine-tuning the mutual interactions of lipids, carbohydrates, and amino acids when comparing to experimental results. We discuss the prospective use of the coarse-grained GPI model for studying protein-sorting and trafficking in membrane models.
KW - Martini force-field
KW - osmotic-pressure
KW - potential-functions
KW - aqueous-solution
KW - dynamics
KW - coefficient
KW - simulation
KW - trypanosoma
KW - transition
KW - parameters
Y1 - 2020
U6 - https://doi.org/10.1021/acs.jctc.0c00056
SN - 1549-9626
SN - 1549-9618
VL - 16
IS - 6
PB - ACS Publications
CY - Washington DC
ER -
TY - JOUR
A1 - Diluiso, Francesca
A1 - Walk, Paula
A1 - Manych, Niccolo
A1 - Cerutti, Nicola
A1 - Chipiga, Vladislav
A1 - Workman, Annabelle
A1 - Ayas, Ceren
A1 - Cui, Ryna Yiyun
A1 - Cui, Diyang
A1 - Song, Kaihui
A1 - Banisch, Lucy A.
A1 - Moretti, Nikolaj
A1 - Callaghan, Max W.
A1 - Clarke, Leon
A1 - Creutzig, Felix
A1 - Hilaire, Jerome
A1 - Jotzo, Frank
A1 - Kalkuhl, Matthias
A1 - Lamb, William F.
A1 - Löschel, Andreas
A1 - Müller-Hansen, Finn
A1 - Nemet, Gregory F.
A1 - Oei, Pao-Yu
A1 - Sovacool, Benjamin K.
A1 - Steckel, Jan Christoph
A1 - Thomas, Sebastian
A1 - Wiseman, John
A1 - Minx, Jan C.
T1 - Coal transitions - part 1
BT - a systematic map and review of case study learnings from regional, national, and local coal phase-out experiences
JF - Environmental research letters
N2 - A rapid coal phase-out is needed to meet the goals of the Paris Agreement, but is hindered by serious challenges ranging from vested interests to the risks of social disruption. To understand how to organize a global coal phase-out, it is crucial to go beyond cost-effective climate mitigation scenarios and learn from the experience of previous coal transitions. Despite the relevance of the topic, evidence remains fragmented throughout different research fields, and not easily accessible. To address this gap, this paper provides a systematic map and comprehensive review of the literature on historical coal transitions. We use computer-assisted systematic mapping and review methods to chart and evaluate the available evidence on historical declines in coal production and consumption. We extracted a dataset of 278 case studies from 194 publications, covering coal transitions in 44 countries and ranging from the end of the 19th century until 2021. We find a relatively recent and rapidly expanding body of literature reflecting the growing importance of an early coal phase-out in scientific and political debates. Previous evidence has primarily focused on the United Kingdom, the United States, and Germany, while other countries that experienced large coal declines, like those in Eastern Europe, are strongly underrepresented. An increasing number of studies, mostly published in the last 5 years, has been focusing on China. Most of the countries successfully reducing coal dependency have undergone both demand-side and supply-side transitions. This supports the use of policy approaches targeting both demand and supply to achieve a complete coal phase-out. From a political economy perspective, our dataset highlights that most transitions are driven by rising production costs for coal, falling prices for alternative energies, or local environmental concerns, especially regarding air pollution. The main challenges for coal-dependent regions are structural change transformations, in particular for industry and labor. Rising unemployment is the most largely documented outcome in the sample. Policymakers at multiple levels are instrumental in facilitating coal transitions. They rely mainly on regulatory instruments to foster the transitions and compensation schemes or investment plans to deal with their transformative processes. Even though many models suggest that coal phase-outs are among the low-hanging fruits on the way to climate neutrality and meeting the international climate goals, our case studies analysis highlights the intricate political economy at work that needs to be addressed through well-designed and just policies.
KW - climate change mitigation
KW - coal transitions
KW - evidence synthesis
KW - political economy
KW - systematic map
Y1 - 2021
U6 - https://doi.org/10.1088/1748-9326/ac1b58
SN - 1748-9326
VL - 16
IS - 11
PB - Institute of Physics Publishing (IOP)
CY - Bristol
ER -
TY - JOUR
A1 - Akarsu, Selim
ED - Mientus, Lukas
ED - Klempin, Christiane
ED - Nowak, Anna
T1 - Coachingtools zur Initiierung der Selbstreflexion in der Lehrer:innenausbildung
JF - Reflexion in der Lehrkräftebildung: Empirisch – Phasenübergreifend – Interdisziplinär (Potsdamer Beiträge zur Lehrerbildung und Bildungsforschung ; 4)
N2 - Sich mit dem eigenen Denken und Handeln reflexiv auseinanderzusetzen ist ein zentrales Element im Selbstreifungsprozess von Lehrkräften im Studium, über die Ausbildung bis hin zur Lehrer:innentätigkeit im Alltag. Der Workshop ermöglichte Zugänge zur selbstreflexiven Auseinandersetzung mit den eigenen Handlungsmustern mithilfe vom Autor (weiter)entwickelter Coachingtools, die im Rahmen der seminaristischen Lehrer:innenbildung in der zweiten Phase konzipiert und erprobt wurden.
KW - Selbstreflexion
KW - Personenorientierung
KW - Kontingenz
KW - Coachingtools
KW - Vorbereitungsdienst
KW - Ausbildungscoaching
Y1 - 2023
U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-631834
SN - 978-3-86956-566-8
SN - 2626-3556
SN - 2626-4722
IS - 4
SP - 343
EP - 348
PB - Universitätsverlag Potsdam
CY - Potsdam
ER -
TY - JOUR
A1 - Schneider, Matthias
A1 - Günter, Christina
A1 - Taubert, Andreas
T1 - Co-deposition of a hydrogel/calcium phosphate hybrid layer on 3D printed poly(lactic acid) scaffolds via dip coating
BT - Towards Automated Biomaterials Fabrication
JF - Polymers
N2 - The article describes the surface modification of 3D printed poly(lactic acid) (PLA) scaffolds with calcium phosphate (CP)/gelatin and CP/chitosan hybrid coating layers. The presence of gelatin or chitosan significantly enhances CP co-deposition and adhesion of the mineral layer on the PLA scaffolds. The hydrogel/CP coating layers are fairly thick and the mineral is a mixture of brushite, octacalcium phosphate, and hydroxyapatite. Mineral formation is uniform throughout the printed architectures and all steps (printing, hydrogel deposition, and mineralization) are in principle amenable to automatization. Overall, the process reported here therefore has a high application potential for the controlled synthesis of biomimetic coatings on polymeric biomaterials.
KW - 3D printing
KW - dip-coating
KW - poly(lactic acid)
KW - PLA
KW - calcium phosphate
KW - gelatin
KW - chitosan
KW - hydrogel
KW - calcium phosphate hybrid material
KW - biomaterials
Y1 - 2018
U6 - https://doi.org/10.3390/polym10030275
SN - 2073-4360
VL - 10
IS - 3
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Sperlich, Eric
A1 - Köckerling, Martin
T1 - Cluster salts [Nb6Cl12(HIm)(6)]A(n) (with HIm=1H-imidazole and A=Mineral Acid Anion, n=1 or 2) made in and with Bronsted-basic ionic liquids and liquid mixtures
JF - ChemistryOpen
N2 - Four new hexanuclear niobium cluster compounds of the general formula [Nb6Cl12(HIm)(6)](A)(n) . x(solvent molecule) (HIm=1H-imidazole, A=mineral acid anion, Cl- (n=2) (1), (SO4)(2-) (n=1) (2), (CrO4)(2-) (n=1) (3), and (HAsO4)(2-) (n=1) (4)) were prepared. Their synthesis can be done in basic ionic liquids, which form on the addition of a mineral acid, which also delivers the counter anion for the final cluster compound, to an excess of the 1H-imidazole. Some addition of an auxiliary solvent, like methanol, improves the speed of crystallisation. The cluster unit comprises a hexanuclear Nb-6 unit of octahedral shape with the edges bridged by Cl atoms and the exo sites being occupied by N-bonded 1H-imidazole ligands. The cluster cation carries sixteen cluster-based electrons. Between the NH groups of the ligands of the cluster unit, the anions and the co-crystallised water (1), or 1H-imidazole and methanol molecules (2, 3, and 4) a network of hydrogen bonds exists.
KW - cluster
KW - ionic liquid
KW - structure elucidation
KW - heterocyclic ligand
KW - Niobium
Y1 - 2021
U6 - https://doi.org/10.1002/open.202000266
SN - 2191-1363
VL - 10
IS - 2
SP - 248
EP - 254
PB - Wiley-VCH
CY - Weinheim
ER -
TY - JOUR
A1 - Torkura, Kennedy A.
A1 - Sukmana, Muhammad Ihsan Haikal
A1 - Cheng, Feng
A1 - Meinel, Christoph
T1 - CloudStrike
BT - chaos engineering for security and resiliency in cloud infrastructure
JF - IEEE access : practical research, open solutions
N2 - Most cyber-attacks and data breaches in cloud infrastructure are due to human errors and misconfiguration vulnerabilities. Cloud customer-centric tools are imperative for mitigating these issues, however existing cloud security models are largely unable to tackle these security challenges. Therefore, novel security mechanisms are imperative, we propose Risk-driven Fault Injection (RDFI) techniques to address these challenges. RDFI applies the principles of chaos engineering to cloud security and leverages feedback loops to execute, monitor, analyze and plan security fault injection campaigns, based on a knowledge-base. The knowledge-base consists of fault models designed from secure baselines, cloud security best practices and observations derived during iterative fault injection campaigns. These observations are helpful for identifying vulnerabilities while verifying the correctness of security attributes (integrity, confidentiality and availability). Furthermore, RDFI proactively supports risk analysis and security hardening efforts by sharing security information with security mechanisms. We have designed and implemented the RDFI strategies including various chaos engineering algorithms as a software tool: CloudStrike. Several evaluations have been conducted with CloudStrike against infrastructure deployed on two major public cloud infrastructure: Amazon Web Services and Google Cloud Platform. The time performance linearly increases, proportional to increasing attack rates. Also, the analysis of vulnerabilities detected via security fault injection has been used to harden the security of cloud resources to demonstrate the effectiveness of the security information provided by CloudStrike. Therefore, we opine that our approaches are suitable for overcoming contemporary cloud security issues.
KW - cloud security
KW - security chaos engineering
KW - resilient architectures
KW - security risk assessment
Y1 - 2020
U6 - https://doi.org/10.1109/ACCESS.2020.3007338
SN - 2169-3536
VL - 8
SP - 123044
EP - 123060
PB - Institute of Electrical and Electronics Engineers
CY - Piscataway
ER -
TY - JOUR
A1 - Al Laban, Firas
A1 - Reger, Martin
A1 - Lucke, Ulrike
T1 - Closing the Policy Gap in the Academic Bridge
JF - Education sciences
N2 - The highly structured nature of the educational sector demands effective policy mechanisms close to the needs of the field. That is why evidence-based policy making, endorsed by the European Commission under Erasmus+ Key Action 3, aims to make an alignment between the domains of policy and practice. Against this background, this article addresses two issues: First, that there is a vertical gap in the translation of higher-level policies to local strategies and regulations. Second, that there is a horizontal gap between educational domains regarding the policy awareness of individual players. This was analyzed in quantitative and qualitative studies with domain experts from the fields of virtual mobility and teacher training. From our findings, we argue that the combination of both gaps puts the academic bridge from secondary to tertiary education at risk, including the associated knowledge proficiency levels. We discuss the role of digitalization in the academic bridge by asking the question: which value does the involved stakeholders expect from educational policies? As a theoretical basis, we rely on the model of value co-creation for and by stakeholders. We describe the used instruments along with the obtained results and proposed benefits. Moreover, we reflect on the methodology applied, and we finally derive recommendations for future academic bridge policies.
KW - policy evaluation
KW - higher education
KW - virtual mobility
KW - teacher training
Y1 - 2022
U6 - https://doi.org/10.3390/educsci12120930
SN - 2227-7102
VL - 12
IS - 12
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Xiong, Chao
A1 - Stolle, Claudia
A1 - Park, Jaeheung
T1 - Climatology of GPS signal loss observed by Swarm satellites
JF - Annales geophysicae
N2 - By using 3-year global positioning system (GPS) measurements from December 2013 to November 2016, we provide in this study a detailed survey on the climatology of the GPS signal loss of Swarm onboard receivers. Our results show that the GPS signal losses prefer to occur at both low latitudes between +/- 5 and +/- 20 degrees magnetic latitude (MLAT) and high latitudes above 60 degrees MLAT in both hemispheres. These events at all latitudes are observed mainly during equinoxes and December solstice months, while totally absent during June solstice months. At low latitudes the GPS signal losses are caused by the equatorial plasma irregularities shortly after sunset, and at high latitude they are also highly related to the large density gradients associated with ionospheric irregularities. Additionally, the high-latitude events are more often observed in the Southern Hemisphere, occurring mainly at the cusp region and along nightside auroral latitudes. The signal losses mainly happen for those GPS rays with elevation angles less than 20 degrees, and more commonly occur when the line of sight between GPS and Swarm satellites is aligned with the shell structure of plasma irregularities. Our results also confirm that the capability of the Swarm receiver has been improved after the bandwidth of the phase-locked loop (PLL) widened, but the updates cannot radically avoid the interruption in tracking GPS satellites caused by the ionospheric plasma irregularities. Additionally, after the PLL bandwidth increased larger than 0.5 Hz, some unexpected signal losses are observed even at middle latitudes, which are not related to the ionospheric plasma irregularities. Our results suggest that rather than 1.0 Hz, a PLL bandwidth of 0.5 Hz is a more suitable value for the Swarm receiver.
KW - Ionosphere
KW - equatorial ionosphere
KW - ionospheric irregularities
KW - radio science
KW - radio wave propagation
Y1 - 2018
U6 - https://doi.org/10.5194/angeo-36-679-2018
SN - 0992-7689
SN - 1432-0576
VL - 36
IS - 2
SP - 679
EP - 693
PB - Copernicus
CY - Göttingen
ER -
TY - JOUR
A1 - Steirou, Eva
A1 - Gerlitz, Lars
A1 - Apel, Heiko
A1 - Sun, Xun
A1 - Merz, Bruno
T1 - Climate influences on flood probabilities across Europe
JF - Hydrology and earth system sciences : HESS
N2 - The link between streamflow extremes and climatology has been widely studied in recent decades. However, a study investigating the effect of large-scale circulation variations on the distribution of seasonal discharge extremes at the European level is missing. Here we fit a climate-informed generalized extreme value (GEV) distribution to about 600 streamflow records in Europe for each of the standard seasons, i.e., to winter, spring, summer and autumn maxima, and compare it with the classical GEV distribution with parameters invariant in time. The study adopts a Bayesian framework and covers the period 1950 to 2016. Five indices with proven influence on the European climate are examined independently as covariates, namely the North Atlantic Oscillation (NAO), the east Atlantic pattern (EA), the east Atlantic-western Russian pattern (EA/WR), the Scandinavia pattern (SCA) and the polar-Eurasian pattern (POL). It is found that for a high percentage of stations the climate-informed model is preferred to the classical model. Particularly for NAO during winter, a strong influence on streamflow extremes is detected for large parts of Europe (preferred to the classical GEV distribution for 46% of the stations). Climate-informed fits are characterized by spatial coherence and form patterns that resemble relations between the climate indices and seasonal precipitation, suggesting a prominent role of the considered circulation modes for flood generation. For certain regions, such as northwestern Scandinavia and the British Isles, yearly variations of the mean seasonal climate indices result in considerably different extreme value distributions and thus in highly different flood estimates for individual years that can also persist for longer time periods.
Y1 - 2019
U6 - https://doi.org/10.5194/hess-23-1305-2019
SN - 1027-5606
SN - 1607-7938
VL - 23
IS - 3
SP - 1305
EP - 1322
PB - Copernicus
CY - Göttingen
ER -