Refine
Year of publication
Document Type
- Article (36086)
- Doctoral Thesis (6536)
- Monograph/Edited Volume (5575)
- Postprint (3296)
- Review (2315)
- Part of a Book (1098)
- Other (973)
- Conference Proceeding (578)
- Preprint (569)
- Part of Periodical (531)
Language
- English (31117)
- German (26198)
- Spanish (365)
- French (330)
- Italian (115)
- Russian (113)
- Multiple languages (70)
- Hebrew (36)
- Portuguese (25)
- Polish (24)
Keywords
- Germany (209)
- climate change (182)
- Deutschland (146)
- machine learning (90)
- European Union (79)
- diffusion (78)
- Sprachtherapie (77)
- Migration (75)
- morphology (74)
- Logopädie (73)
Institute
- Institut für Biochemie und Biologie (5506)
- Institut für Physik und Astronomie (5471)
- Institut für Geowissenschaften (3686)
- Institut für Chemie (3492)
- Wirtschaftswissenschaften (2645)
- Historisches Institut (2528)
- Department Psychologie (2358)
- Institut für Mathematik (2159)
- Institut für Romanistik (2115)
- Sozialwissenschaften (1884)
A circular, single-contig Methanobacterium sp. metagenome-assembled genome (MAG) was recovered from high-CO2 enrichments inoculated with drill core material from the tectonic Eger Rift terrestrial subsurface.
Annotation of the recovered MAG highlighted putative methanogenesis genes, providing valuable information on archaeal activity in the deep biosphere.
Refractive index provides fundamental insights into the electronic structure of materials. At high pressure, however, the determination of refractive index and its wavelength dispersion is challenging, which limits our understanding of how physical properties of even simple materials, such as MgO, evolve with pressure.
Here, we report on the measurement of room-temperature refractive index of MgO up to similar to 140 GPa.
The refractive index of MgO at 600 nm decreases by similar to 2.4% from similar to 1.737 at 1 atm to similar to 1.696 (+/- 0.017) at similar to 140 GPa.
Despite the index at 600 nm is essentially pressure independent, the absolute wavelength dispersion of the refractive index at 550-870 nm decreases by similar to 28% from similar to 0.015 at 1 atm to similar to 0.011 (+/- 8.04 x 10(-4)) at similar to 103 GPa.
Single-effective-oscillator analysis of our refractive index data suggests that the bandgap of MgO increases by similar to 1.1 eV from 7.4 eV at 1 atm to similar to 8.5 (+/- 0.6) eV at similar to 103 GPa.
We have investigated the self-assembly of the graphene nanoribbon molecular precursor 10,10'-dibromo-9,9'-bianthryl (DBBA) on Au(111) with frequency modulation scanning force microscopy (FM-SFM) at room temperature combined with ab initio calculations.
For low molecular coverages, the molecules aggregate along the substrate herringbone reconstruction main directions while remaining mobile.
At intermediate coverage, two phases coexist, zigzag stripes of monomer chains and decorated herringbones. For high coverage, the molecules assemble in a dimer-striped phase.
The adsorption behaviour of DBBA molecules and their interactions are discussed and compared with the results from ab initio calculations.
The Gram-negative bacterium Paenalcaligenes niemegkensis NGK35(T) was isolated from plastic debris in an abandoned landfill.
It has the ability to grow on polyethylene and hexadecane as the sole carbon sources. Here, we report the corresponding draft genome, which contains 3.66 Mbp and is characterized by a G+C content of 52.1%.
International migration patterns, at the global level, can to a large extent be explained through economic factors in origin and destination countries.
On the other hand, it has been shown that global climate change is likely to affect economic development over the coming decades.
Here, we demonstrate how these future climate impacts on national income levels could alter the global migration landscape.
Using an empirically calibrated global migration model, we investigate two separate mechanisms. The first is through destination-country income, which has been shown consistently to have a positive effect on immigration.
As countries' income levels relative to each other are projected to change in the future both due to different rates of economic growth and due to different levels of climate change impacts, the relative distribution of immigration across destination countries also changes as a result, all else being equal.
Second, emigration rates have been found to have a complex, inverted U-shaped dependence on origin-country income.
Given the available migration flow data, it is unclear whether this dependence-found in spatio-temporal panel data-also pertains to changes in a given migration flow over time. If it does, then climate change will additionally affect migration patterns through origin countries' emigration rates, as the relative and absolute positions of countries on the migration "hump" change.
We illustrate these different possibilities, and the corresponding effects of 3 degrees C global warming (above pre-industrial) on global migration patterns, using climate model projections and two different methods for estimating climate change effects on macroeconomic development.
Teacher collaboration is an important feature of job satisfaction and self-efficacy for teachers.
Moreover, the collaboration of teachers is important for adopting professional changes as professional development (PD) activities that include opportunities for collaboration have been shown to support teachers in improving classroom practice.
This may even lead to higher student performance.
Situated in the context of the Advanced Placement (AP) reform in the United States, we investigated the perceived importance of opportunities to collaborate with colleagues as a rationale to participate in PD (N = 3,725 teachers).
The opportunity to collaborate with colleagues was a primary rationale why teachers selected PD activities.
While this rationale is only slightly related to school and teacher characteristics, it was related to PD characteristics.
Specifically, opportunities to collaborate with colleagues were important to teachers in selecting informal face-to-face (FtF) PD activities.
We conclude that collaborative structures benefit all forms of teacher professional development.
We present the extension of the Kalmag model, proposed as a candidate for IGRF-13, to the twentieth century.
The dataset serving its derivation has been complemented by new measurements coming from satellites, ground-based observatories and land, marine and airborne surveys.
As its predecessor, this version is derived from a combination of a Kalman filter and a smoothing algorithm, providing mean models and associated uncertainties. These quantities permit a precise estimation of locations where mean solutions can be considered as reliable or not.
The temporal resolution of the core field and the secular variation was set to 0.1 year over the 122 years the model is spanning.
Nevertheless, it can be shown through ensembles a posteriori sampled, that this resolution can be effectively achieved only by a limited amount of spatial scales and during certain time periods.
Unsurprisingly, highest accuracy in both space and time of the core field and the secular variation is achieved during the CHAMP and Swarm era. In this version of Kalmag, a particular effort was made for resolving the small-scale lithospheric field.
Under specific statistical assumptions, the latter was modeled up to spherical harmonic degree and order 1000, and signal from both satellite and survey measurements contributed to its development.
External and induced fields were jointly estimated with the rest of the model. We show that their large scales could be accurately extracted from direct measurements whenever the latter exhibit a sufficiently high temporal coverage.
Temporally resolving these fields down to 3 hours during the CHAMP and Swarm missions, gave us access to the link between induced and magnetospheric fields. In particular, the period dependence of the driving signal on the induced one could be directly observed.
The model is available through various physical and statistical quantities on a dedicated website at https://ionocovar.agnld.uni-potsdam.de/Kalmag/.
The diffusion process of water in swelling (expansive) soil often deviates from normal Fick diffusion and belongs to anomalous diffusion.
The process of water adsorption by swelling soil often changes with time, in which the microstructure evolves with time and the absorption rate changes along a fractal dimension gradient function.
Thus, based on the material coordinate theory, this paper proposes a variable order derivative fractal model to describe the cumulative adsorption of water in the expansive soil, and the variable order is time dependent linearly.
The cumulative adsorption is a power law function of the anomalous sorptivity, and patterns of the variable order.
The variable-order fractal derivative model is tested to describe the cumulative adsorption in chernozemic surface soil, Wunnamurra clay and sandy loam.
The results show that the fractal derivative model with linearly time dependent variable-order has much better accuracy than the fractal derivative model with a constant derivative order and the integer order model in the application cases.
The derivative order can be used to distinguish the evolution of the anomalous adsorption process. The variable-order fractal derivative model can serve as an alternative approach to describe water anomalous adsorption in swelling soil.
Hintergrund
Lungenkrebsbetroffene sind besonders stark durch psychischen Stress belastet. Gleichzeitig sind die Inanspruchnahmeraten von psychoonkologischer Unterstützung relativ gering. Es ist wenig über die Gründe der (Nicht‑)Inanspruchnahme bekannt.
Fragestellung
Welche emotionalen Herausforderungen erleben Menschen mit Lungenkrebs? Was sind ihre Gründe für die (Nicht‑)Inanspruchnahme psychoonkologischer Unterstützung?
Material und Methode
Es wurden qualitative Interviews mit 20 Lungenkrebsbetroffenen ausgewertet, die im Rahmen der CoreNAVI-Studie durchgeführt wurden.
Ergebnisse
Die Befragten erleben psychischen Stress in Form von Unsicherheiten und Zukunftsängsten. Auch den Druck, schnell von einer Behandlung in die nächste gehen zu müssen und keine Zeit für sich zu haben, nehmen die Betroffenen als belastend wahr. Das offene Sprechen, ohne das persönliche Umfeld belasten zu müssen, sowie konkrete Ratschläge erleben die Nutzer*innen der Psychoonkologie als große Hilfestellung. Die Nichtinanspruchnahme wird durch fehlenden Bedarf und mangelnde Kapazitäten begründet. Zudem werden Vorbehalte gegenüber psychologischer Unterstützung deutlich.
Schlussfolgerung
Betroffene mit Lungenkrebs erleben psychische und emotionale Belastungen auch durch die Vielzahl und Dichte an Therapien. Daraus resultierende fehlende Kapazitäten könnten eine Erklärung für die geringe Inanspruchnahme von psychoonkologischer Unterstützung sein. Eine stärkere Gewichtung der Psychoonkologie gegenüber aufwendigen medizinischen, oft nur geringfügig lebensverlängernden Therapien sowie der Abbau von Vorbehalten gegenüber psychologischer Hilfe sollten in der Versorgungspraxis verstärkt in den Fokus rücken.
Since the adoption of the Paris Agreement, the focus of the United Nations climate regime has shifted from forging consensus among national governments toward animating implementation activity across multiple levels.
Based on a case study of the Global Climate Action Portal-an online database designed to document nonstate actor climate commitments and implementation efforts-we trace, conceptualize, and assess how the roles of data, data infrastructures, and actor constellations have changed as a result of this shift.
We argue that in the pre-COP21 negotiation phase, the United Nations Climate Secretariat strategically used the database to orchestrate and leverage nonstate actor commitments to exert pressure on intergovernmental negotiations.
By contrast, in the post-COP21 implementation phase, the Secretariat, in collaboration with climate data specialists, is seeking to develop the portal to track and animate implementation activity.
Given these developments, we discuss the potential and limitations of data-driven climate governance and set out avenues for future research.