TY - JOUR A1 - Aldoretta, E. J. A1 - St-Louis, N. A1 - Richardson, N. D. A1 - Moffat, Anthony F. J. A1 - Eversberg, T. A1 - Hill, G. M. T1 - The Results of the 2013 Pro-Am Wolf-Rayet Campaign JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Professional and amateur astronomers around the world contributed to a 4-month long campaign in 2013, mainly in spectroscopy but also in photometry, interferometry and polarimetry, to observe the first 3 Wolf-Rayet stars discovered: WR 134 (WN6b), WR 135 (WC8) and WR 137 (WC7pd+O9). Each of these stars are interesting in their own way, showing a variety of stellar wind structures. The spectroscopic data from this campaign were reduced and analyzed for WR 134 in order to better understand its behavior and long-term periodicity in the context of CIRs in the wind. We will be presenting the results of these spectroscopic data, which include the confirmation of the CIR variability and a time-coherency of ∼ 40 days (half-life of ∼ 20 days). Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87713 SP - 75 EP - 78 ER - TY - JOUR A1 - Arthur, S. J. T1 - Wolf-Rayet nebulae and the wind-interstellar medium interaction JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - I review our current understanding of the interaction between a Wolf-Rayet star's fast wind and the surrounding medium, and discuss to what extent the predictions of numerical simulations coincide with multiwavelength observations of Wolf-Rayet nebulae. Through a series of examples, I illustrate how changing the input physics affects the results of the numerical simulations. Finally, I discuss how numerical simulations together with multiwavelength observations of these objects allow us to unpick the previous mass-loss history of massive stars. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88267 SP - 315 EP - 320 ER - TY - JOUR A1 - Barnes, Jan A1 - Kennewell, Steve T1 - Teacher Perceptions of Key Competencies in ICT JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Regardless of what is intended by government curriculum specifications and advised by educational experts, the competencies taught and learned in and out of classrooms can vary considerably. In this paper, we discuss in particular how we can investigate the perceptions that individual teachers have of competencies in ICT, and how these and other factors may influence students’ learning. We report case study research which identifies contradictions within the teaching of ICT competencies as an activity system, highlighting issues concerning the object of the curriculum, the roles of the participants and the school cultures. In a particular case, contradictions in the learning objectives between higher order skills and the use of application tools have been resolved by a change in the teacher’s perceptions which have not led to changes in other aspects of the activity system. We look forward to further investigation of the effects of these contradictions in other case studies and on forthcoming curriculum change. KW - ICT competencies KW - Teacher perceptions KW - Activity Theory KW - Contradictions Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82604 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 61 EP - 75 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Becker, Andrew C. A1 - Bomans, Dominik J. A1 - Weis, K. T1 - Finding new Wolf-Rayet stars in the Magellanic Clouds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Obtaining a complete census of massive, evolved stars in a galaxy would be a key ingredient for testing stellar evolution models. However, as the evolution of stars is also strongly dependent on their metallicity, it is inevitable to have this kind of data for a variety of galaxies with different metallicities. Between 2009 and 2011, we conducted the Magellanic Clouds Massive Stars and Feedback Survey (MSCF); a spatially complete, multi-epoch, broad- and narrow-band optical imaging survey of the Large and Small Magellanic Clouds. With the inclusion of shallow images, we are able to give a complete photometric catalog of stars between B ≈ 18 and B ≈ 19 mag. These observations were augmented with additional photometric data of similar spatial res- olution from UV to IR (e.g. from GALEX, 2MASS and Spitzer) in order to sample a large portion of the spectral energy distribution of the brightest stars (B < 16 mag) in the Magel- lanic Clouds. Using these data, were are able to train a machine learning algorithm that gives us a good estimate of the spectral type of tens of thousands of stars. This method can be applied to the search for Wolf-Rayet-Stars to obtain a sample of candi- dates for follow-up observations. As this approach can, in principle, be adopted for any resolved galaxy as long as sufficient photometric data is available, it can form an effective alternative method to the classical strategies (e.g. He II filter imaging). Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87618 SP - 47 EP - 50 ER - TY - JOUR A1 - Beradze, S. A1 - Kochiashvili, N. A1 - Natsvlishvili, R. A1 - Kochiashvili, I. A1 - Janiashvili, E. A1 - Urushadze, T. A1 - Vardosanidze, M. T1 - P Cygni and its Observations at the Abastumani Observatory JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We found original observations of PCygni by E. Kharadze and N. Magalashvili in the archives of the Abastumani Observatory. These observations were carried out in the period 1951–1983. Initially they used 29 Cygni as a comparison star, and all observations of PCygni were processed using this star. On the basis of their calculations, the authors decided that PCygni may be a WUMa type binary with an orbital period of 0.500565 d, but this hypothesis was not confirmed. The only observations that have been published in the Bulletin of the Abastumani Astrophysical Observatory were those of of 1951–1955. There are whole sets of observational data not only for PCygni and 29 Cygni, but in the majority of cases also for 36 Cygni in the archives. We recalculated all data (where it was possible) using 36 Cygni as a comparison star. We are presenting UBV light curves of the variable, and also observations made by V. Nikonov in Abastumani in the period 1935–1937 Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88389 SP - 353 ER - TY - JOUR A1 - Bestenlehner, J. M. T1 - Stellar parameters from photometric data for fainter and more distant Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Spectroscopy is the preferred way to study the physical and wind properties of Wolf-Rayet (WR) stars, but with decreasing brightness and increasing distance of the object spectroscopy become very expensive. However, photometry still delivers a high signal to noise ratio. Current and past astronomical surveys and space missions provide large data sets, that can be harvested to discover new WR stars and study them over a wide metallicity range with the help of state of the art stellar atmosphere and evolutionary models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88390 SP - 354 ER - TY - JOUR A1 - Bibby, J. A1 - Shara, M. A1 - Zurek, D. A1 - Crowther, P. A. A1 - Moffat, Anthony F. J. A1 - Drissen, L. A1 - Wilde, M. T1 - The Distribution of Massive Stars in M101 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - 75 WR stars and 164 RSGs are identified in a single WFC3 pointing of our M101 survey. We find that within it's large star-forming complex NGC 5462 WR stars are preferentially located in the core whilst RSGs are found in the halo, suggesting two bursts of star-formation. A review of our WR candidates reveals that only ∼30% are detected in the archival broad-band ACS imaging whilst only ∼50% are associated with HII regions. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88402 SP - 355 ER - TY - JOUR A1 - Bomans, Dominik J. A1 - Becker, Andrew C. A1 - Kleemann, B. A1 - Weis, K. A1 - Pasquali, A. T1 - Luminous Wolf-Rayet stars at low metallicity JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The evolution of massive stars in very low metallicity galaxies is less well observationally constrained than in environments more similar to the Milky Way, M33, or the LMC. We discuss in this contribution the current state of our program to search for and characterize Wolf-Rayet stars (and other massive emission line stars) in low metallicity galaxies in the Local Volume. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87635 SP - 51 EP - 54 ER - TY - JOUR A1 - Bottino, Rosa A1 - Chioccariello, Augusto T1 - Computational Thinking BT - Videogames, Educational Robotics, and other Powerful Ideas to Think with JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Digital technology has radically changed the way people work in industry, finance, services, media and commerce. Informatics has contributed to the scientific and technological development of our society in general and to the digital revolution in particular. Computational thinking is the term indicating the key ideas of this discipline that might be included in the key competencies underlying the curriculum of compulsory education. The educational potential of informatics has a history dating back to the sixties. In this article, we briefly revisit this history looking for lessons learned. In particular, we focus on experiences of teaching and learning programming. However, computational thinking is more than coding. It is a way of thinking and practicing interactive dynamic modeling with computers. We advocate that learners can practice computational thinking in playful contexts where they can develop personal projects, for example building videogames and/or robots, share and discuss their construction with others. In our view, this approach allows an integration of computational thinking in the K-12 curriculum across disciplines. KW - Computational thinking KW - programming in context KW - informatics education Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82820 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 301 EP - 309 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Bröker, Kathrin A1 - Kastens, Uwe A1 - Magenheim, Johannes T1 - Competences of Undergraduate Computer Science Students JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The paper presents two approaches to the development of a Computer Science Competence Model for the needs of curriculum development and evaluation in Higher Education. A normativetheoretical approach is based on the AKT and ACM/IEEE curriculum and will be used within the recommendations of the German Informatics Society (GI) for the design of CS curricula. An empirically oriented approach refines the categories of the first one with regard to specific subject areas by conducting content analysis on CS curricula of important universities from several countries. The refined model will be used for the needs of students’ e-assessment and subsequent affirmative action of the CS departments. KW - Competences KW - Competence Measurement KW - Curriculum Development KW - Computer Science Education KW - Recommendations for CS-Curricula in Higher Education Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82613 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 77 EP - 96 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Buffon, Giuseppe T1 - The Franciscans in Cathay BT - memory of men and places. A Contribution for the genealogy of geographical knowledge of Alexander von Humboldt JF - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies N2 - The study analyzes the process that leads to the elaboration of the thesis of a continuity between the Medieval Asia mission and the New World mission. This effort, undertaken by the Catholic historiography of the mission during the XIX century, is the result of the impulse provided by Alexander von Humboldt’s studies about the discovery of America (Examen critique). The data about the geography of Asia collected by the missionaries-travelers working in the territory between Karakorum and Khanbalik during the XIII e XIV century reaches Christopher Colombus with the mediation of Roger Bacon, whom Humboldt himself esteems as a true cultural mediator. The conclusion of the article tries to identify reasons and modalities of the secularization of the missionary concept, i.e. the shift from the ideal of the propagation of the Christian message to a prevailing interest for cartography and topography, transformations arranged by a late medieval historiography that introduces into martyrolagia the loca toponomastica. N2 - Lo studio analizza il processo che conduce all’elaborazione della tesi di una continuità tra missione asiatica medievale e missione nel Nuovo Mondo. L’impegno, assunto dalla storiografia missionaria cattolica lungo il corso del XIX secolo, costituisce l’esito dell’impulso proveniente dagli studi svolti da Alexander von Humboldt intorno all’esplorazione delle Americhe (Examen critique). Le informazioni sullo spazio asiatico trasmesse dai missionari operanti durante il XIII e il XIV secolo tra Karakorum e Khanbaliq pervengono a Cristoforo Colombo mediante Ruggero Bacone (Opus majus), che Humlbodt stesso stima mediatore culturale per antonomasia. La parte conclusiva della ricerca si occupa di stabilire modalità e ragioni della secolarizzazione del concetto di missione, cioè del trasferimento all’interesse cartografico dell’anelito alla propagazione del messaggio cristiano fino agli estremi confini della terra, trasformazione predisposta dalla storiografia medievale che nei martirologia inserisce appunto i loca toponomastici. N2 - El estudio analiza el proceso que conduce a la elaboración de la tesis sobre una posible continuidad entre la misión asiática medieval y la misión en el Nuevo Mundo. El empeño, asumido por parte de la historiografía misionera católica a lo largo del siglo XIX, constituye el resultado del impulso proveniente de los estudios desarrollados por Alexander von Humboldt en torno a la exploración de las Américas (Examen critique). Las informaciones sobre el espacio asiático transmitidas por los misioneros que operaron durante los siglos XIII y XIV entre Karakorum y Khanbaliq llegan a Cristobal Colón a través de Roger Bacon (Opus majus), que el mismo Humboldt considera como un mediador cultural por antonomasia. La parte conclusiva de la investigación se dedica a establecer las modalidades y regiones de la secularización del concepto de misión, es decir, de la transferencia al interés cartográfico del anhelo por la propagación del mensaje cristiano hasta los extremos confines de la tierra, una transformación que fue predispuesta por la historiografía medieval que en los martirologios insertaba los lugares toponímicos. KW - examen critique KW - Franziskaner KW - Kolonialgeschichte KW - Kolonialismus KW - Kolumbus KW - Ordensgeschichte Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86920 SN - 1617-5239 SN - 2568-3543 VL - XVI IS - 30 SP - 13 EP - 28 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Büchner, Steffen T1 - Empirical and Normative Research on Fundamental Ideas of Embedded System Development JF - KEYCIT 2014 - Key Competencies in Informatics and ICT KW - Theory KW - Embedded Systems KW - Fundamental Ideas Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82949 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 393 EP - 396 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Calderón, D. A1 - Ballone, A. A1 - Cuadra, J. A1 - Schartmann, M. A1 - Burkert, Andreas A1 - Gillessen, S. T1 - Formation of the infalling Galactic Centre cloud G2 by collision of stellar winds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The gas cloud G2 is currently being tidally disrupted by the Galactic Centre super-massive black hole, Sgr A*. The region around the black hole is populated by ∼ 30 Wolf-Rayet stars, which produce strong outflows. Here we explore the possibility that gas clumps like G2 originate from the collision of stellar winds via the non-linear thin shell instability. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88412 SP - 356 ER - TY - JOUR A1 - Chené, A.-N. A1 - Wyrick, D. A1 - Borissova, J. A1 - Kuhn, M. A1 - Hervé, A. A1 - Ramírez Alegría, S. A1 - Bonatto, C. A1 - Bouret, J.-C. A1 - Kurtev, R. T1 - Improving distances to Galactic Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Before GAIA improves the HIPPARCOS survey, direct determination of the distance via parallax is only possible for γ Vel, but the analysis of the cluster or association to which WR stars are associated can give distances with a 50% to a 10% accuracy. The list of Galactic clusters, associations and clusters/association candidates has grown significantly in the last decade with the numerous deep, high resolution surveys of the Milky Way. In this work, we revisit the fundamental parameters of known clusters with WR stars, and we present the search for new ones. All our work is based on the catalogs from the VVV (from the VISTA telescope) and the UKIDS (from the UKIRT telescope) near infrared surveys. Finally, the relations between the fundamental parameters of clusters with WR stars are explored. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87759 SP - 97 EP - 100 ER - TY - JOUR A1 - Cherchneff, I. T1 - Dust formation in carbon-rich Wolf-Rayet colliding winds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Carbon-rich Wolf-Rayet stars are efficient carbon dust makers. Despite the strong evidence for dust formation in these objects provided by infrared thermal emission from dust, the routes to nucleation and condensation and the physical conditions required for dust production are still poorly understood. We discuss here the potential routes to carbon dust and the possible locations conducive to dust formation in the colliding winds of WC binaries. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88177 SP - 269 EP - 274 ER - TY - JOUR A1 - Christensen, Rhonda A1 - Knezek, Gerald T1 - The Technology Proficiency Self-Assessment Questionnaire (TPSA) BT - Evolution of a Self-Efficacy Measure for Technology Integration JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The Technology Proficiency Self-Assessment (TPSA) questionnaire has been used for 15 years in the USA and other nations as a self-efficacy measure for proficiencies fundamental to effective technology integration in the classroom learning environment. Internal consistency reliabilities for each of the five-item scales have typically ranged from .73 to .88 for preservice or inservice technology-using teachers. Due to changing technologies used in education, researchers sought to renovate partially obsolete items and extend self-efficacy assessment to new areas, such as social media and mobile learning. Analysis of 2014 data gathered on a new, 34 item version of the TPSA indicates that the four established areas of email, World Wide Web (WWW), integrated applications, and teaching with technology continue to form consistent scales with reliabilities ranging from .81 to .93, while the 14 new items gathered to represent emerging technologies and media separate into two scales, each with internal consistency reliabilities greater than .9. The renovated TPSA is deemed to be worthy of continued use in the teaching with technology context. KW - Technology proficiency KW - self-efficacy KW - teacher competencies Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82838 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 311 EP - 318 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Conti, P. S. T1 - Concluding Remarks JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Selected remarks concerning Wolf-Rayet (W-R) stars in the framework of this workshop are given. The rich history of international conferences over the past four or so decades is summarized, important issues concerning W-R stars are considered, and some outstanding problems are reviewed. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88347 SP - 347 EP - 350 ER - TY - JOUR A1 - Crowther, P. A. T1 - Wolf-Rayet content of the Milky Way JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - An overview of the known Wolf-Rayet (WR) population of the Milky Way is presented, including a brief overview of historical catalogues and recent advances based on infrared photometric and spectroscopic observations resulting in the current census of 642 (vl.13 online catalogue). The observed distribution of WR stars is considered with respect to known star clusters, given that ≤20% of WR stars in the disk are located in clusters. WN stars outnumber WC stars at all galactocentric radii, while early-type WC stars are strongly biased against the inner Milky Way. Finally, recent estimates of the global WR population in the Milky Way are reassessed, with 1,200±100 estimated, such that the current census may be 50% complete. A characteristic WR lifetime of 0.25 Myr is inferred for an initial mass threshold of 25 M⊙. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87562 SP - 21 EP - 26 ER - TY - JOUR A1 - Curzon, Paul T1 - Unplugged Computational Thinking for Fun JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Computational thinking is a fundamental skill set that is learned by studying Informatics and ICT. We argue that its core ideas can be introduced in an inspiring and integrated way to both teachers and students using fun and contextually rich cs4fn ‘Computer Science for Fun’ stories combined with ‘unplugged’ activities including games and magic tricks. We also argue that understanding people is an important part of computational thinking. Computational thinking can be fun for everyone when taught in kinaesthetic ways away from technology. KW - Computational thinking KW - cs4fn KW - ‘unplugged’ computing KW - kinaesthetic teaching KW - fun Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82575 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 15 EP - 27 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Dagiene, Valentina A1 - Stupuriene, Gabriele T1 - Informatics Education based on Solving Attractive Tasks through a Contest JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The paper discusses the issue of supporting informatics (computer science) education through competitions for lower and upper secondary school students (8–19 years old). Competitions play an important role for learners as a source of inspiration, innovation, and attraction. Running contests in informatics for school students for many years, we have noticed that the students consider the contest experience very engaging and exciting as well as a learning experience. A contest is an excellent instrument to involve students in problem solving activities. An overview of infrastructure and development of an informatics contest from international level to the national one (the Bebras contest on informatics and computer fluency, originated in Lithuania) is presented. The performance of Bebras contests in 23 countries during the last 10 years showed an unexpected and unusually high acceptance by school students and teachers. Many thousands of students participated and got a valuable input in addition to their regular informatics lectures at school. In the paper, the main attention is paid to the developed tasks and analysis of students’ task solving results in Lithuania. KW - Informatics Education KW - Computer Science Education KW - Tasks KW - Tests KW - Contest KW - Problem Solving KW - Cognitive Skills KW - Bloom’s Taxonomy Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82626 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 97 EP - 115 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Dal Bo, Federico T1 - The Theological and Cultural Challenge of Messianic Jews BT - Towards a New Jewish Paradigm? JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [21 (2015)] = Jesus in den Jüdischen Kulturen des 19. und 20. Jahrhunderts JF - PaRDeS : Journal of the Association of Jewish Studies [21 (2015)] = Jesus in the Jewish cultures of the 19th and 20th century N2 - Messianische Juden sind Juden, die den messianischen Charakter Jesus sowohl wie den in traditionelles Judentum übermittelten Kult synkretistisch annehmen. Der vorliegende Beitrag untersucht die Entstehung dieser synkretistischen und im heutigen Israel marginalen Bewegung und behauptet, dass sie eine radikale Entwicklung in der zweitausendjährigen Geschichte der jüdisch-christlichen Beziehungen darstellt. Dieser Beitrag bietet eine allgemeine Einführung in den Begriff der jüdisch-christlichen Identität, eine kurze Geschichte von der ersten Gruppe der messianischen Juden im Land Israels, einen Überblick über den religiösen Synkretismus der messianischen Juden und ihren den kulturellen Einfluss auf den modernen Israel und, schließlich, die Implikation, dass das messianische Judentum für ein neues Paradigma innerhalb der verschiedenen Hauptströmungen des Judentums gehalten werden sollte. N2 - Messianic Jews are Jewish individuals who syncretically accept both the messianic character of Jesus and the ritual cultic practices provided by traditional Judaism. The present article examines the emergence of this marginal syncretic movement in contemporary Israel, and maintains that it represents a radical development in the bimillenary history of Jewish-Christian relations. This article offers a general introduction to the notion of Jewish-Christian identity, a brief history of the first group of Messianic Jews in the Land of Israel, the cultural influence and religious syncretism of the Messianic Jews in modern Israel, and, finally, the implication that Messianic Judaism is supposed to become the new paradigm within the various branches of Judaism. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-85762 SN - 978-3-86956-331-2 SN - 1614-6492 SN - 1862-7684 VL - 21 SP - 33 EP - 58 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Delgado Kloos, Carlos T1 - What about the Competencies of Educators in the New Era of Digital Education? JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - A lot has been published about the competencies needed by students in the 21st century (Ravenscroft et al., 2012). However, equally important are the competencies needed by educators in the new era of digital education. We review the key competencies for educators in light of the new methods of teaching and learning proposed by Massive Open Online Courses (MOOCs) and their on-campus counterparts, Small Private Online Courses (SPOCs). KW - Massive Open Online Courses KW - Small Private Online Courses KW - Competencies KW - Digital Education KW - Digital Revolution KW - Big Data Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-83015 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 435 EP - 438 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Dessart, L. T1 - Wolf-Rayet stars as supernova progenitors JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - In this review, I discuss the suitability of massive star progenitors, evolved in isolation or in interacting binaries, for the production of observed supernovae (SNe) IIb, Ib, Ic. These SN types can be explained through variations in composition. The critical need of non-thermal effects to produce He I lines favours low-mass He-rich ejecta (in which ^56 Ni can be more easily mixed with He) for the production of SNe IIb/Ib, which thus may arise preferentially from moderate-mass donors in interacting binaries. SNe Ic may instead arise from higher mass progenitors, He-poor or not, because their larger CO cores prevent efficient non-thermal excitation of He i lines. However, current single star evolution models tend to produce Wolf-Rayet (WR) stars at death that have a final mass of > 10 M⊙. Single WR star explosion models produce ejecta that are too massive to match the observed light curve widths and rise times of SNe IIb/Ib/Ic, unless their kinetic energy is systematically and far greater than the canonical value of 10^56 erg. Future work is needed to evaluate the energy/mass degeneracy in light curve properties. Alternatively, a greater mass loss during the WR phase, perhaps in the form of eruptions, as evidenced in SNe Ibn, may reduce the final WR mass. If viable, such explosions would nonetheless favour a SN Ic, not a Ib. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88133 SP - 245 EP - 250 ER - TY - JOUR A1 - Diethelm, Ira A1 - Syrbe, Jörn T1 - Let’s talk about CS! BT - Towards a suitable Classroom Language and Terminology of CS for Teaching JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - To communicate about a science is the most important key competence in education for any science. Without communication we cannot teach, so teachers should reflect about the language they use in class properly. But the language students and teachers use to communicate about their CS courses is very heterogeneous, inconsistent and deeply influenced by tool names. There is a big lack of research and discussion in CS education regarding the terminology and the role of concepts and tools in our science. We don’t have a consistent set of terminology that we agree on to be helpful for learning our science. This makes it nearly impossible to do research on CS competencies as long as we have not agreed on the names we use to describe these. This workshop intends to provide room to fill with discussion and first ideas for future research in this field. KW - Terminology KW - classroom language KW - CS concepts KW - competencies KW - tools Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82983 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 411 EP - 414 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Dwarkadas, Vikram V. A1 - Rosenberg, D. T1 - X-ray Emission from Ionized Wind-Bubbles around Wolf-Rayet Stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Using a code that employs a self-consistent method for computing the effects of photoionization on circumstellar gas dynamics, we model the formation of wind-driven nebulae around massive Wolf-Rayet (W-R) stars. Our algorithm incorporates a simplified model of the photo-ionization source, computes the fractional ionization of hydrogen due to the photoionizing flux and recombination, and determines self-consistently the energy balance due to ionization, photo-heating and radiative cooling. We take into account changes in stellar properties and mass-loss over the star's evolution. Our multi-dimensional simulations clearly reveal the presence of strong ionization front instabilities. Using various X-ray emission models, and abundances consistent with those derived for W-R nebulae, we compute the X-ray flux and spectra from our wind bubble models. We show the evolution of the X-ray spectral features with time over the evolution of the star, taking the absorption of the X-rays by the ionized bubble into account. Our simulated X-ray spectra compare reasonably well with observed spectra of Wolf-Rayet bubbles. They suggest that X-ray nebulae around massive stars may not be easily detectable, consistent with observations.∗ Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88301 SP - 329 EP - 332 ER - TY - JOUR A1 - Eldridge, J. J. A1 - McClelland, L. A. S. A1 - Xiao, L. A1 - Stanway, E. R. A1 - Bray, J. T1 - The importance of getting single-star and binary physics correct JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We discuss the uncertainties that need to be considered when creating numerical models of WR stars. We pay close attention to inflation and duplicity of the stellar models, highlighting several observational tests that show these are key to understanding WR stellar populations. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87966 SP - 177 EP - 182 ER - TY - JOUR A1 - Ellis, Jason Brent A1 - Abreu-Ellis, Carla Reis T1 - Student Perspectives of Social Networking use in Higher Education JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Social networks are currently at the forefront of tools that lend to Personal Learning Environments (PLEs). This study aimed to observe how students perceived PLEs, what they believed were the integral components of social presence when using Facebook as part of a PLE, and to describe student’s preferences for types of interactions when using Facebook as part of their PLE. This study used mixed methods to analyze the perceptions of graduate and undergraduate students on the use of social networks, more specifically Facebook as a learning tool. Fifty surveys were returned representing a 65 % response rate. Survey questions included both closed and open-ended questions. Findings suggested that even though students rated themselves relatively well in having requisite technology skills, and 94 % of students used Facebook primarily for social use, they were hesitant to migrate these skills to academic use because of concerns of privacy, believing that other platforms could fulfil the same purpose, and by not seeing the validity to use Facebook in establishing social presence. What lies at odds with these beliefs is that when asked to identify strategies in Facebook that enabled social presence to occur in academic work, the majority of students identified strategies in five categories that lead to social presence establishment on Facebook during their coursework. KW - Social KW - networks KW - higher KW - education KW - personal KW - learning KW - environments KW - Facebook Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82632 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 117 EP - 131 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Eversberg, T. A1 - Aldoretta, E. J. A1 - Knapen, J. H. A1 - Moffat, Anthony F. J. A1 - Morel, T. A1 - Ramiaramanantsoa, T. A1 - Rauw, G. A1 - Richardson, N. D. A1 - St-Louis, N. A1 - Teodoro, M. T1 - World-wide amateur observations BT - A viable future of massive star research JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - For some years now, spectroscopic measurements of massive stars in the amateur domain have been fulfilling professional requirements. Various groups in the northern and southern hemispheres have been established, running successful professional-amateur (ProAm) collaborative campaigns, e.g., on WR, O and B type stars. Today high quality data (echelle and long-slit) are regularly delivered and corresponding results published. Night-to-night long-term observations over months to years open a new opportunity for massive-star research. We introduce recent and ongoing sample campaigns (e.g. ∊ Aur, WR 134, ζ Pup), show respective results and highlight the vast amount of data collected in various data bases. Ultimately it is in the time-dependent domain where amateurs can shine most. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87705 SP - 71 EP - 74 ER - TY - JOUR A1 - Falceta-Goncalves, D. T1 - Magnetic fields, non-thermal radiation and particle acceleration in colliding winds of WR-O stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Non-thermal emission has been detected in WR-stars for many years at long wavelengths spectral range, in general attributed to synchrotron emission. Two key ingredients are needed to explain such emissions, namely magnetic fields and relativistic particles. Particles can be accelerated to relativistic speeds by Fermi processes at strong shocks. Therefore, strong synchrotron emission is usually attributed to WR binarity. The magnetic field may also be amplified at shocks, however the actual picture of the magnetic field geometry, intensity, and its role on the acceleration of particles at WR binary systems is still unclear. In this work we discuss the recent developments in MHD modelling of wind-wind collision regions by means of numerical simulations, and the coupled particle acceleration processes related. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88211 SP - 289 EP - 292 ER - TY - JOUR A1 - Georgy, C. A1 - Ekström, S. A1 - Hirschi, R. A1 - Meynet, G. A1 - Groh, J. H. A1 - Eggenberger, P. T1 - Wolf-Rayet stars as an evolved stage of stellar life JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Wolf-Rayet (WR) stars, as they are advanced stages of the life of massive stars, provide a good test for various physical processes involved in the modelling of massive stars, such as rotation and mass loss. In this paper, we show the outputs of the latest grids of single massive stars computed with the Geneva stellar evolution code, and compare them with some observations. We present a short discussion on the shortcomings of single stars models and we also briefly discuss the impact of binarity on the WR populations. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88097 SP - 229 EP - 232 ER - TY - JOUR A1 - Gormaz-Matamala, A. C. A1 - Hervé, A. A1 - Chené, A.-N. A1 - Curé, M. A1 - Mennickent, R. E. T1 - Results Of The Spectroscopic Analysis Of WR6 Using CMFGEN JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Using ESPaDOnS optical spectra of WR6, we search variations on the stellar wind parameters during the different phases of the spectral variations. We use the radiative transfer code CMFGEN (Hillier & Miller 1998) to determine the wind parameters. Our work gives mean parameters for WR6, Teff = 55 kK, M = 2.7 × 10^-5 M⊙/yr and v∞ =1700 km/s. Furthermore the line profiles variations at different phases are the consequence of a variation of mass loss rate and temperature un the winds. Effective temperature reaches 59 kK at the highest intensity, whereas the mass-loss rate decreases to 2.5 × 10^-5 M⊙/yr in that case. On the other hand, effective temperature decreases to 52.5 kK and the mass-loss rate increases to 3 × 10^-5 M/⊙yr when the line profile reach its minimum intensity. Results confirm the variable nature of the stellar wind, presented in this case on two of its fundamental parameters: temperature and mass-loss; which could be used to constrain the nature of the instability at the basis of the wind. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88422 SP - 357 ER - TY - JOUR A1 - Gosset, E. T1 - Studies of WR+O colliding-wind binaries JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Two of the main physical parameters that govern the massive star evolution, the mass and the mass-loss rate, are still poorly determined from the observational point of view. Only binary systems could provide well constrained masses and colliding-wind binaries could bring some constraints on the mass-loss rate. Therefore, colliding-wind binaries turn out to be very promising objects. In this framework, we present detailed studies of basic observational data obtained with the XMM-Newton facility and combined with ground-based observations and other data. We expose the results for two particularly interesting WR+O colliding-wind binaries: WR22 and WR21a. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88247 SP - 305 EP - 308 ER - TY - JOUR A1 - Grassitelli, L. A1 - Langer, N. A1 - Sanyal, D. A1 - Fossati, Luca A1 - Bestenlehner, J. M. T1 - Instabilities in the envelope of Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Wolf-Rayet stars are very hot stars close to the Eddington limit. In the conditions encountered in their radiation pressure dominated outer layers several instabilities are expected to arise. These instabilities could influence both the dynamic of their optically thick winds and the observed spectral lines introducing small and large scale variability. We investigate the conditions in the convective envelopes of our helium star models and relate them to the appearance of a high number of stochastic density inhomogeneities, i.e. clumping in the optically thick wind. We also investigate the pulsational stability of these envelope, considering the effect of the high stellar wind mass loss rates. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88024 SP - 201 EP - 204 ER - TY - JOUR A1 - Grillenberger, Andreas A1 - Romeike, Ralf T1 - Teaching Data Management BT - Key Competencies and Opportunities JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Data management is a central topic in computer science as well as in computer science education. Within the last years, this topic is changing tremendously, as its impact on daily life becomes increasingly visible. Nowadays, everyone not only needs to manage data of various kinds, but also continuously generates large amounts of data. In addition, Big Data and data analysis are intensively discussed in public dialogue because of their influences on society. For the understanding of such discussions and for being able to participate in them, fundamental knowledge on data management is necessary. Especially, being aware of the threats accompanying the ability to analyze large amounts of data in nearly real-time becomes increasingly important. This raises the question, which key competencies are necessary for daily dealings with data and data management. In this paper, we will first point out the importance of data management and of Big Data in daily life. On this basis, we will analyze which are the key competencies everyone needs concerning data management to be able to handle data in a proper way in daily life. Afterwards, we will discuss the impact of these changes in data management on computer science education and in particular database education. KW - Data Management KW - Key Competencies KW - Big Data KW - NoSQL KW - Databases KW - Data Privacy KW - Data Analysis KW - Challenges Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82648 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 133 EP - 150 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Groh, J. H. T1 - The end stages of massive star evolution BT - WR stars as SN Ibc progenitors JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The morphological appearance of massive stars across their post-Main Sequence evolution and before the SN event is very uncertain, both from a theoretical and observational perspective. We recently developed coupled stellar evolution and atmospheric modeling of stars done with the Geneva and CMFGEN codes, for initial masses between 9 and 120 M⊙. We are able to predict the observables such as the high-resolution spectrum and broadband photometry. Here I discuss how the spectrum of a massive star changes across its evolution and before death, with focus on the WR stage. Our models indicate that single stars with initial masses larger than 30 M⊙ end their lives as WR stars. Depending on rotation, the spectrum of the star can either be that of a WN or WO subtype at the pre-SN stage. Our models allow, for the first time, direct comparison between predictions from stellar evolution models and observations of SN progenitors. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88115 SP - 237 EP - 240 ER - TY - JOUR A1 - Guerrero, Martín A. T1 - Planetary nebulae and Their Central Stars in X-rays JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Two types of X-ray sources are mostly found in planetary nebulae (PNe): point sources at their central stars and diffuse emission inside hot bubbles. Here we describe these two types of sources based on the most recent observations obtained in the framework of the Chandra Planetary Nebula Survey, ChanPlaNS, an X-ray survey targeting a volume-limited sample of PNe. Diffuse X-ray emission is found preferentially in young PNe with sharp, closed inner shells. Point sources of X-ray emission at the central stars reveal magnetically active binary companions and shock-in stellar winds. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88160 SP - 263 EP - 266 ER - TY - JOUR A1 - Gull, T. R. T1 - Eta Carinae BT - Many Advances .... Even More Puzzles JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Since Augusto Damineli's demonstration in 1996 that Eta Carinae is a binary with a 5.52 year period, many innovative observations and increasingly advanced three-dimensional models have led to considerable insight on this massive system that ejected at least ten, possibly forty, solar masses in the nineteenth century. Here we present a review of our current understanding of this complex system and point out continuing puzzles. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87876 SP - 149 EP - 154 ER - TY - JOUR A1 - Gómez-González, Víctor Mauricio Alfonso A1 - Mayya, Yalia Divakara A1 - Rosa-González, D. T1 - Detection and Characterization of Wolf-Rayet stars in M81 with GTC/OSIRIS spectra and HST images JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Here we investigate a sample of young star clusters (YSCs) and other regions of recent star formation with Wolf-Rayet (W-R) features detected in the relatively nearby spiral galaxy M81 by analysing long-slit (LS) and Multi-Object Spectroscopy (MOS) spectra obtained with the OSIRIS instrument at the 10.4-m Gran Telescopio Canarias (GTC). We take advantage of the synergy between GTC spectra and Hubble Space Telescope (HST) images to also reveal their spatial localization and the environments hosting these stars. We finally discuss and comment on the next steps of our study. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87604 SP - 43 EP - 46 ER - TY - JOUR A1 - Hamaguchi, K. A1 - Corcoran, M. F. T1 - Extremely Hard X-ray Emission from η Car Observed with XMM-Newton and NuSTAR around Periastron in 2014.6 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The super massive binary system, η Car, experienced periastron passage in the summer of 2014. We observed the star twice around the maximum (forb =0.97, 2014 June 6) and just before the minimum (ϕorb =0.99, 2014 July 28) of its wind-wind colliding (WWC) X-ray emis-sion using the XMM-Newton and NuSTAR observatories, the latter of which is equipped with extremely hard X-ray (>10 keV) focusing mirrors. In both observations, NuSTAR detected the thermal X-ray tail up to 40-50 keV. The hard slope is consistent with an electron tem- perature of ∼6 keV, which is significantly higher than the ionization temperature (kT ∼4 keV) measured from the Fe K emission lines, assuming collisional equilibrium plasma. The spectrum did not show a hard power-law component above this energy range, unlike earlier detections with INTEGRAL and Suzaku. In the second NuSTAR observation, the X-ray flux above 5 keV declined gradually in ∼1 day. This result suggests that the WWC apex was gradually hidden behind the optically thick primary wind around conjunction. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87926 SP - 159 EP - 162 ER - TY - JOUR A1 - Haugsbakken, Halvdan T1 - The Student Learning Ecology JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Educational research on social media has showed that students use it for socialisation, personal communication, and informal learning. Recent studies have argued that students to some degree use social media to carry out formal schoolwork. This article gives an explorative account on how a small sample of Norwegian high school students use social media to self-organise formal schoolwork. This user pattern can be called a “student learning ecology”, which is a user perspective on how participating students gain access to learning resources. KW - Learning ecology KW - social media KW - high school KW - Norway Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82659 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 151 EP - 169 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Haßler, Gerda ED - McElvenny, James T1 - ‘Communicating the past to the present’ BT - Is anachronism inevitable? Desirable? JF - History and Philosophy of the Language Sciences KW - anachronism KW - conceptual history KW - Ferdinand de Saussure KW - linguistic historiography KW - Plato´s Cratylus KW - salon KW - word order Y1 - 2015 UR - http://hiphilangsci.net/2015/06/03/salon-anachronism-in-linguistic-historiography SN - 2366-2409 ER - TY - JOUR A1 - Hendrix, T. A1 - Keppens, R. T1 - Modelling colliding wind binaries in 2D JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We look at how the dynamics of colliding wind binaries (CWB) can be investigated in 2D, and how several parameters influence the dynamics of the small scale structures inside the colliding wind and the shocked regions, as well as in how the dynamics influence the shape of the collision region at large distances. The parameters we adopt are based on the binary system WR98a, one of the few Wolf-Rayet (WR) dusty pinwheels known. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88198 SP - 279 EP - 282 ER - TY - JOUR A1 - Heywood-Jones, David T1 - Tobias Metzler: Tales of Three Cities. Urban Jewish Cultures in London, Berlin, and Paris (c. 1880–1940) (= Jüdische Kultur, Bd. 28) / reviewed by David Heywood-Jones JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [21 (2015)] = Jesus in den Jüdischen Kulturen des 19. und 20. Jahrhunderts JF - PaRDeS : Journal of the Association of Jewish Studies [21 (2015)] = Jesus in the Jewish cultures of the 19th and 20th century N2 - Reviewed work: Tobias Metzler: Tales of Three Cities. Urban Jewish Cultures in London, Berlin, and Paris (c. 1880–1940) (= Jüdische Kultur, Bd. 28). Wiesbaden: Harrassowitz 2014. 412 S. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86301 SN - 978-3-86956-331-2 SN - 1614-6492 SN - 1862-7684 VL - 21 SP - 255 EP - 259 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Hillier, D. J. T1 - Spectrum formation in Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We highlight the basic physics that allows fundamental parameters, such as the effective temperature, luminosity, abundances, and mass-loss rate, of Wolf-Rayet (W-R) stars to be determined. Since the temperature deduced from the spectrum of a W-R star is an ionization temperature, a detailed discussion of the ionization structure of W-R winds, and how it is set, is given. We also provide an overview of line and continuum formation in W-R stars. Mechanisms that contribute to the strength of different emission lines, such as collisional excitation, radiative recombination, dielectronic recombination, and continuum uorescence, are discussed. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87669 SP - 65 EP - 70 ER - TY - JOUR A1 - Hoffman, J. L. A1 - Lomax, J. R. T1 - Structure and fate of binary WR stars BT - Clues from spectropolarimetry JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Because most massive stars have been or will be affected by a companion during the course of their evolution, we cannot afford to neglect binaries when discussing the progenitors of supernovae and GRBs. Analyzing linear polarization in the emission lines of close binary systems allows us to probe the structures of these systems' winds and mass flows, making it possible to map the complex morphologies of the mass loss and mass transfer structures that shape their subsequent evolution. In Wolf-Rayet (WR) binaries, line polarization variations with orbital phase distinguish polarimetric signatures arising from lines that scatter near the stars from those that scatter far from the orbital plane. These far-scattering lines may form the basis for a "binary line-effect method" of identifying rapidly rotating WR stars (and hence GRB progenitor candidates) in binary systems. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87737 SP - 85 EP - 88 ER - TY - JOUR A1 - Jones, Anthony T1 - ICT Competencies for School Students JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - This paper discusses results from a small-scale research study, together with some recently published research into student perceptions of ICT for learning in schools, to consider relevant skills that do not appear to currently being taught. The paper concludes by raising three issues relating to learning with and through ICT that need to be addressed in school curricula and classroom teaching. KW - Learning with ICT KW - student perceptions KW - student experience Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82663 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 171 EP - 179 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Kalas, Ivan T1 - Programming at Pre-primary and Primary Levels BT - The Pipeline Can Start That Early JF - KEYCIT 2014 - Key Competencies in Informatics and ICT KW - Learning interfaces development KW - computational thinking KW - educational programming KW - primary level KW - pre-primary level Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82587 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 29 EP - 31 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Kanarek, G. A1 - Shara, M. A1 - Faherty, J. A1 - Zurek, D. A1 - Moffat, Anthony F. J. T1 - New Galactic Wolf-Rayet Stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Over the course of 6 months in 2013, we observed nearly 400 Wolf-Rayet candidates in the Galactic plane. Preliminary results from this dataset are presented. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88448 SP - 359 ER - TY - JOUR A1 - Kehrig, C. A1 - Vílchez, J. M. A1 - Pérez-Montero, E. A1 - Iglesias-Páramo, J. A1 - Brinchmann, Jarle A1 - Crowther, P. A. A1 - Durret, F. A1 - Kunth, D. T1 - PopIII-star siblings in IZw18 and metal-poor WR galaxies unveiled from integral field spectroscopy JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Here, we highlight our recent results from the IFS study of Mrk178, the closest metal-poor WR galaxy, and of IZw18, the most metal-poor star-forming galaxy known in the local Universe. The IFS data of Mrk178 show the importance of aperture effects on the search for WR features, and the extent to which physical variations in the ISM properties can be detected. Our IFS data of IZw18 reveal its entire nebular HeIIλ4686-emitting region, and indicate for the very first time that peculiar, hot (nearly) metal-free ionizing stars (called here PopIII-star siblings) might hold the key to the HeII-ionization in IZw18. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87648 SP - 55 EP - 58 ER - TY - JOUR A1 - Kochiashvili, N. A1 - Beradze, S. A1 - Kochiashvili, I. A1 - Natsvlishvili, R. A1 - Vardosanidze, M. T1 - New Photometric Observations of P Cygni JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present the results of the new photometric observations of the famous hypergiant PCygni. New observations were obtained in 2014 using the 48 cm Cassegrain telescope of the Abastumani Astrophysical Observatory, Georgia. We reveal some interesting behaviors of the B,V,R,I light curves, and also report new results on the periodicity of PCygni's variation. The latter result is based on the analysis of the photometric data (U,B,V filters) collected at the Abastumani Observatory between 1937 and 1983. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88452 SP - 360 ER - TY - JOUR A1 - Koenigsberger, C. T1 - HD5980 BT - wind collisions and binary star evolution JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - HD5980 is a multiple system containing at least 3 very massive and luminous stars. Located in the Small Magellanic Cloud, it is an ideal system for studying the massive star structure and evolutionary processes in low-metallicity environments. Intensely observed over the past few decades, HD5980 is a treasure trove of information on stellar wind structure, on wind-wind collisions and on the formation of wind-blown circumstellar structures. In addition, its characteristics suggest that the eclipsing WR+LBV stars of the system are the product of quasihomogeneous chemical evolution, thus making them candidate pair production supernovae or GRB progenitors. This paper summarizes some of the outstanding results derived from half a century of observations and recent theoretical studies. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87954 SP - 171 EP - 174 ER - TY - JOUR A1 - Kourniotis, M. A1 - Bonanos, A. A1 - Najarro, F. T1 - Accurate parameters of massive binaries in the Danks clusters JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present results from our near-infrared spectroscopy with VLT/ISAAC of four, massive eclipsing binary systems in the young, heavily reddened, massive Danks clusters. We derive accurate fundamental parameters and the distance to these massive systems, which comprise of OIf+, WR and O-type stars. Our goal is to increase the sample of well-studied WR stars and constrain their physics by comparison with evolutionary models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87819 SP - 121 EP - 124 ER - TY - JOUR A1 - Küker, Manfred T1 - Magnetospheres of massive stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We study the interaction of line-driven winds from massive stars with the magnetic field rooted in these stars by carrying out numerical simulations using the Nirvana MHD code in 2D in spherical polar coordinates. The code's adaptive mesh refinement feature allows high spatial resolution across the whole simulation box. We study both O and Wolf-Rayet stars for a range of magnetic field strengths from weak to strong as measured by the confinement parameter. For weak fields our simulations show that the initially dipolar field opens up far away from the star and a thin disk-like structure forms in the equatorial plane of the magnetic field. For stronger fields the disk is disrupted close to the stellar surface and closed field lines persist at low latitudes. For very strong fields a pronounced magnetosphere forms where the gas is forced to move along the field lines and eventually falls back to the stellar surface. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87864 SP - 143 EP - 146 ER - TY - JOUR A1 - Langer, N. A1 - Sanyal, D. A1 - Grassitelli, L. A1 - Szésci, D. T1 - The stellar Eddington limit JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - It is often assumed that when stars reach their Eddington limit, strong outflows are initiated, and that this happens only for extreme stellar masses. We discuss here that in models of up to 500 M⊙, the Eddington limit is never reached at the stellar surface. Instead, we argue that the Eddington limit is reached inside the stellar envelope in hydrogen-rich stars above ∼ 30 M⊙ and in Wolf-Rayet stars above ∼ 7 M⊙, with drastic effects for their struture and stability. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88121 SP - 241 EP - 244 ER - TY - JOUR A1 - Lewin, Cathy A1 - McNicol, Sarah T1 - Supporting the Development of 21st Century Skills through ICT JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The growing impact of globalisation and the development of a ‘knowledge society’ have led many to argue that 21st century skills are essential for life in twenty-first century society and that ICT is central to their development. This paper describes how 21st century skills, in particular digital literacy, critical thinking, creativity, communication and collaboration skills, have been conceptualised and embedded in the resources developed for teachers in iTEC, a four-year, European project. The effectiveness of this approach is considered in light of the data collected through the evaluation of the pilots, which considers both the potential benefits of using technology to support the development of 21st century skills, but also the challenges of doing so. Finally, the paper discusses the learning support systems required in order to transform pedagogies and embed 21st century skills. It is argued that support is required in standards and assessment; curriculum and instruction; professional development; and learning environments. KW - 21st century skills, KW - primary education KW - secondary education KW - pedagogy KW - innovation Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82672 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 181 EP - 198 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Liermann, A. T1 - Evolution of Wolf-Rayet spectra JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Wolf-Rayet stars are important sources for the enrichment of the ISM with nuclear processed elements, UV photons and momentum. They are descendants of high-mass stars for which short lifetimes and transition times can hamper the spectral classification of the stars in their different evolutionary phases. The expanded stellar atmospheres of Wolf-Rayet stars can show spectra which seem inconsistent with the anticipated underlying evolution phase, for example in late hydrogen-burning WN stars and Of/WN transition stars. We present a sequence of synthetic spectra of the Potsdam Wolf-Rayet models based on the latest Geneva stellar evolution models. This will visualize the changes in stellar spectra over a full stellar lifetime. Direct comparison with observed stellar spectra, as well as the evolution of diagnostic line ratios will improve the connection of spectral classification and evolution phase. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87830 SP - 129 EP - 132 ER - TY - JOUR A1 - Lundberg, Karin T1 - Networking knowledge BT - considering Alexander von Humboldt‘s legacy in a new shared space in education JF - HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies N2 - Global citizenship and diversity are well-represented concepts in today’s higher education. Learning outcomes and competencies are designed to sensitize students to the many cultural backgrounds of U.S. learning institutions. Nevertheless, true globality, as represented through diverse discourses and perspectives of the world, still seems neglected in curricula and course assignments. This article explores the possibilities offered through a new shared space in education where different forms of networked knowledge and multifaceted perspectives can build a global platform of exchange in a diverse student population. The universal science concept described by Alexander von Humboldt at the beginning of the 19th Century illuminates this intertwined approach to knowledge of the world, which has the potential to positively impact contemporary curricula and course design. Von Humboldt’s writings emphasize inclusion and interplay among cultures and natural phenomena. By inviting our students to be active representatives of diverse discourses, these interconnecting links will become more transparent. In turn, productive forms of knowing about the world may enrich current learning objectives and thereby reflect a true global citizenship as it evolves in a new shared space of education. Keywords: global citizenship, plurality, diverse discourses, multicultural education. N2 - Weltbürgerschaft und kulturelle Vielfalt sind überall gegenwärtige Konzepte im heutigen Bildungswesen. In den Vereinigten Staaten werden Lernziele und Kompetenzen geformt, um die Studenten gegenüber den vielen kulturellen Hintergründen, die in den Bildungsinstitutionen vorzutreffen sind, zu sensibilisieren.Trotzdem wird wahre Globalität, wie sie heute in den vielfältigen Diskursen und Perspektiven der Welt repräsentiert ist, immer noch in Lehrplänen und Studienarbeiten vernachlässigt. Dieser Artikel untersucht die Möglichkeiten, die sich heute im Bildungswesen durch den neuen, gemeinsam geteilten, globalen Bildungsraum anbieten, in dem die multikulturelle Studentenbevölkerung verschiedene Formen vernetzten Wissens und facettenreiche Perspektiven der Welt eine globale Plattform des Austausches bildet. Das von Alexander von Humboldt am Anfang des neunzehnten Jahrhunderts beschriebene universale Wissenschaftskonzept, beleuchtet solch einen vernetzten Ansatz an ein Wissen um die Welt, der auf heutige Bildungskonzepte und Kursdesigns einen positiven Einfluss nehmen könnte. Humboldts Schriften unterstreichen die Bedeutung der Inklusivität und des Wechselspiels zwischen Kulturen und Naturphänomenen. Indem wir Studenten mit unterschiedlichem kulturellen Hintergrundwissen dazu einladen, ihre jeweiligen Diskurse des Wissens aktiv zu repräsentieren, werden diese gegenseitig mit einander verknüpten Beziehungen des Wissens transparenter. Auf diese Weise, entsteht die Möglichkeit, heutige Lernziele mit neuen, produktiven Formen des Weltwissens zu berreichern, worin sich ein wahres Weltbürgertum, wie es sich in diesem neuen Bildungsraum des globalen Austausches hervortut, wiederspiegeln würde. N2 - La citoyenneté mondiale et la diversité figurent aujourd’hui parmi les concepts les plus représentés dans les études supérieures. Les résultats de l’apprentissage et les compétences sont conçus pour rendre les étudiants sensibles aux nombreuses origines culturelles des établissements d’instruction des États-Unis. Néanmoins, la vraie globalité, représentée à travers des perspectives et des discours divers, semble être toujours négligée dans les programmes scolaires et les attributions de cours. Dans cet article l’auteur explore les possibilités offertes par un nouvel espace partagé dans le domaine de l’éducation -- une éducation caractérisée d’ailleurs par des formes variées de connaissances atteintes dans des réseaux différents et en des perspectives multiples qui peuvent contribuer à construire une plate-forme globale d’échange dans une population d’étudiants hétérogène. Le concept de la science universelle décrit par Alexander von Humboldt au début du dix-neuvième siècle éclaire cette approche étroitement liée aux connaissances du monde qui a le potentiel d’avoir un impact positif sur les programmes scolaires contemporains et les conceptions des cours. En effet, dans son oeuvre Von Humboldt met l’emphase sur l’importance de l’inclusion et de l’interaction entre les cultures et les phénomènes naturels. En invitant nos étudiants à être des représentants actifs de discours divers, ces liens d’interconnexion leur seront de plus en plus évidents. Par conséquent, il se peut que les objectifs du savoir puissent être enrichis par ces façons différentes de connaître le monde tandis qu’ils réflèteront de plus en plus une véritable citoyenneté mondiale qui évoluera en même temps en réponse à ce nouvel espace partagé dans l’éducation contemporaine. Mots-clés: la citoyenneté mondiale, la pluralité, les discours divers, l’éducation multiculturelle. KW - Erziehung KW - Netzwerke des Wissens Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86968 SN - 1617-5239 SN - 2568-3543 VL - XVI IS - 30 SP - 78 EP - 83 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Madura, T. I. A1 - Clementel, N. A1 - Gull, T. R. A1 - Kruip, C. J. H. A1 - Paardekooper, J.-P. A1 - Icke, V. T1 - 3D hydrodynamical and radiative transfer modeling of η Carinae's colliding winds JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present results of full 3D hydrodynamical and radiative transfer simulations of the colliding stellar winds in the massive binary system η Carinae. We accomplish this by applying the SimpleX algorithm for 3D radiative transfer on an unstructured Voronoi-Delaunay grid to recent 3D smoothed particle hydrodynamics (SPH) simulations of the binary colliding winds. We use SimpleX to obtain detailed ionization fractions of hydrogen and helium, in 3D, at the resolution of the original SPH simulations. We investigate several computational domain sizes and Luminous Blue Variable primary star mass-loss rates. We furthermore present new methods of visualizing and interacting with output from complex 3D numerical simulations, including 3D interactive graphics and 3D printing. While we initially focus on η Car, the methods employed can be applied to numerous other colliding wind (WR 140, WR 137, WR 19) and dusty `pinwheel' (WR 104, WR 98a) binary systems. Coupled with 3D hydrodynamical simulations, SimpleX simulations have the potential to help determine the regions where various observed time-variable emission and absorption lines form in these unique objects. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87930 SP - 163 EP - 166 ER - TY - JOUR A1 - Magenheim, Johannes A1 - Nelles, Wolfgang A1 - Neugebauer, Jonas A1 - Ohrndorf, Laura A1 - Schaper, Niclas A1 - Schubert, Sigrid T1 - Expert Rating of Competence Levels in Upper Secondary Computer Science Education JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - In the project MoKoM, which is funded by the German Research Foundation (DFG) from 2008 to 2012, a test instrument measuring students’ competences in computer science was developed. This paper presents the results of an expert rating of the levels of students’ competences done for the items of the instrument. At first we will describe the difficulty-relevant features that were used for the evaluation. These were deduced from computer science, psychological and didactical findings and resources. Potentials and desiderata of this research method are discussed further on. Finally we will present our conclusions on the results and give an outlook on further steps. KW - Competence Modelling KW - Competence Measurement KW - Informatics System Application KW - Informatics System Comprehension KW - Informatics Modelling KW - Secondary Education Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82683 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 199 EP - 216 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Magenheim, Johannes A1 - Schubert, Sigrid A1 - Schapert, Niclas T1 - Modelling and Measurement of Competencies in Computer Science Education JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - As a result of the Bologna reform of educational systems in Europe the outcome orientation of learning processes, competence-oriented descriptions of the curricula and competence-oriented assessment procedures became standard also in Computer Science Education (CSE). The following keynote addresses important issues of shaping a CSE competence model especially in the area of informatics system comprehension and object-oriented modelling. Objectives and research methodology of the project MoKoM (Modelling and Measurement of Competences in CSE) are explained. Firstly, the CSE competence model was derived based on theoretical concepts and then secondly the model was empirically examined and refined using expert interviews. Furthermore, the paper depicts the development and examination of a competence measurement instrument, which was derived from the competence model. Therefore, the instrument was applied to a large sample of students at the gymnasium’s upper class level. Subsequently, efforts to develop a competence level model, based on the retrieved empirical results and on expert ratings are presented. Finally, further demands on research on competence modelling in CSE will be outlined. KW - Competence Modelling KW - Competence Measurement KW - Informatics System Application KW - Informatics System Comprehension KW - Informatics Modelling KW - Secondary Education Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82592 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 33 EP - 57 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Maina, Anthony Gioko A1 - Angondi, Enos Kiforo A1 - Waga, Rosemary T1 - How does the Implementation of a Literacy Learning Tool Kit influence Literacy Skill Acquisition? JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - This study aimed at following how teachers transfer skills into results while using ABRA literacy software. This was done in the second part of the pilot study whose aim was to provide equity to control group teachers and students by exposing them to the ABRACADABRA treatment after the end of phase 1. This opportunity was used to follow the phase 1 teachers to see how the skills learned were being transformed into results. A standard three-day initial training and planning session on how to use ABRA to teach literacy was held at the beginning of each phase for ABRA teachers (phase 1 experimental and phase 2 delayed ABRA). Teachers were provided with teaching materials including a tentative ABRA curriculum developed to align with the Kenyan English Language requirements for year 1 and 3 students. Results showed that although there was no significant difference between the groups in vocabulary-related subscales which include word reading and meaning as well as sentence comprehension, students in ABRACADABRA classes improved their scores at a significantly higher rate than students in control classes in comprehension related scores. An average student in the ABRACADABRA group improved by 12 and 16 percentile points respectively compared to their counterparts in the control group. KW - ABRACADABRA KW - Early Literacy KW - Achievement KW - Teachers KW - Learners Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82856 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 319 EP - 326 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - GEN A1 - Mardoukhi, Yousof A1 - Jeon, Jae-Hyung A1 - Metzler, Ralf T1 - Geometry controlled anomalous diffusion in random fractal geometries BT - looking beyond the infinite cluster T2 - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - We investigate the ergodic properties of a random walker performing (anomalous) diffusion on a random fractal geometry. Extensive Monte Carlo simulations of the motion of tracer particles on an ensemble of realisations of percolation clusters are performed for a wide range of percolation densities. Single trajectories of the tracer motion are analysed to quantify the time averaged mean squared displacement (MSD) and to compare this with the ensemble averaged MSD of the particle motion. Other complementary physical observables associated with ergodicity are studied, as well. It turns out that the time averaged MSD of individual realisations exhibits non-vanishing fluctuations even in the limit of very long observation times as the percolation density approaches the critical value. This apparent non-ergodic behaviour concurs with the ergodic behaviour on the ensemble averaged level. We demonstrate how the non-vanishing fluctuations in single particle trajectories are analytically expressed in terms of the fractal dimension and the cluster size distribution of the random geometry, thus being of purely geometrical origin. Moreover, we reveal that the convergence scaling law to ergodicity, which is known to be inversely proportional to the observation time T for ergodic diffusion processes, follows a power-law ∼T−h with h < 1 due to the fractal structure of the accessible space. These results provide useful measures for differentiating the subdiffusion on random fractals from an otherwise closely related process, namely, fractional Brownian motion. Implications of our results on the analysis of single particle tracking experiments are provided. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 980 KW - plasma-membrane KW - mechanisms KW - motion KW - nonergodicity KW - models Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-474864 SN - 1866-8372 IS - 980 SP - 30134 EP - 30147 ER - TY - JOUR A1 - Marston, A. P. A1 - Mauerhan, J. A1 - Morris, P. W. A1 - Van Dyk, S. T1 - Finding Wolf-Rayet Stars in the Milky Way BT - Inputs to Star Formation and Stellar Evolution JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The total population of Wolf-Rayet (WR) stars in the Galaxy is predicted by models to be as many as ~6000 stars, and yet the number of catalogued WR stars as a result of optical surveys was far lower than this (~200) at the turn of this century. When beginning our WR searches using infrared techniques it was not clear whether WR number predictions were too optimistic or whether there was more hidden behind interstellar and circumstellar extinction. During the last decade we pioneered a technique of exploiting the near- and mid-infrared continuum colours for individual point sources provided by large-format surveys of the Galaxy, including 2MASS and Spitzer/GLIMPSE, to pierce through the dust and reveal newly discovered WR stars throughout the Galactic Plane. The key item to the colour discrimination is via the characteristic infrared spectral index produced by the strong winds of the WR stars, combined with dust extinction, which place WR stars in a relatively depopulated area of infrared colour-colour diagrams. The use of the Spitzer/GLIMPSE 8µm and, more recently, WISE 22µm fluxes together with cross-referencing with X-ray measurements in selected Galactic regions have enabled improved candidate lists that increased our confirmation success rate, achieved via follow-up infrared and optical spectroscopy. To date a total of 102 new WR stars have been found with many more candidates still available for follow-up. This constitutes an addition of ~16% to the current inventory of 642 Galactic WR stars. In this talk we review our methods and provide some new results and a preliminary review of their stellar and interstellar medium environments. We provide a roadmap for the future of this search, including statistical modeling, and what we can add to star formation and high mass star evolution studies. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87577 SP - 27 EP - 30 ER - TY - JOUR A1 - Maryeva, O. A1 - Polcaro, V. F. A1 - Rossi, C. A1 - Viotti, R. T1 - Modeling of spectral variability of Romano's star JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present results of investigation of spectral variability of one of the most interesting massive stars, Romano's star (M33/V532 or GR290), located in the M33 galaxy. Brightness of the star changes together with its spectral class, which varies from WN11 to WN8. Using CMFGEN code we estimated parameters of stellar atmosphere and found that during last ten years bolometric luminosity of the star changed synchronously with stellar magnitude. Our calculations argue in favor of the hypothesis of a post-LBV status of GR290. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88462 SP - 361 ER - TY - JOUR A1 - Massey, P. A1 - Neugent, K. F. A1 - Morrell, N. I. T1 - Finding Wolf-Rayet Stars in the Local Group JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We summarize past and current surveys for WRs among the Local Group galaxies, empha- sizing both the why and how. Such studies are invaluable for helping us learn about massive star evolution, and for providing sensitive tests of the stellar evolution models. But for such surveys to be useful, the completeness limits must be well understood. We illustrate that point by following the “evolution” of the observed WC/WN ratio in nearby galaxies. We end by examining our new survey for WR stars in the Magellanic Clouds, which has revealed a new type of WN star, never before seen. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87592 SP - 35 EP - 42 ER - TY - JOUR A1 - McClelland, L. A. S. A1 - Eldridge, J. J. T1 - Helium stars BT - Towards an understanding of Wolf–Rayet evolution JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - There are outstanding problems in trying to reproduce the observed nature of Wolf–Rayet stars from theoretical stellar models. We have investigated the effects of uncertainties, such as composition and mass-loss rate, on the evolution and structure of Wolf–Rayet stars and their lower mass brethren. We find that the normal Conti scenario needs to be altered, with different WR types being due to different initial masses as well as different stages of evolution. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88010 SP - 197 EP - 200 ER - TY - JOUR A1 - Mesa-Delgado, A. A1 - Esteban, C. A1 - García-Rojas, J. T1 - Ring Nebulae BT - Tracers of the CNO Nucleosynthesis JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Preliminary results are presented from spectroscopic data in the optical range of the Galactic ring nebulae NGC 6888, G2:4+1:4, RCW 58 and Sh2-308. Deep observations with long exposure times were carried out at the 6.5m Clay Telescope and at the 10.4m Gran Telescopio Canarias. In NGC 6888, recombination lines of C ii, O ii and N ii are detected with signal-to-noise ratios higher than 8. The chemical content of NGC 6888 is discussed within the chemical enrichment predicted by evolution models of massive stars. For all nebulae, a forthcoming work will content in-depth details about observations, analysis and final results (Esteban et al. 2015, in prep.). Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88299 SP - 325 EP - 328 ER - TY - JOUR A1 - Meynet, G. A1 - Georgy, C. A1 - Maeder, A. A1 - Ekström, S. A1 - Groh, J. H. A1 - Barblan, F. A1 - Song, H. F. A1 - Eggenberger, P. T1 - Physics of massive stars relevant for the modeling of Wolf-Rayet populations JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Key physical ingredients governing the evolution of massive stars are mass losses, convection and mixing in radiative zones. These effects are important both in the frame of single and close binary evolution. The present paper addresses two points: 1) the differences between two families of rotating models, i.e. the family of models computed with and without an efficient transport of angular momentum in radiative zones; 2) The impact of the mass losses in single and in close binary models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87971 SP - 183 EP - 188 ER - TY - JOUR A1 - Micheuz, Peter T1 - Discussing Educational Standards for Digital Competence and/or Informatics Education at Lower Secondary Level JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Participants of this workshop will be confronted exemplarily with a considerable inconsistency of global Informatics education at lower secondary level. More importantly, they are invited to contribute actively on this issue in form of short case studies of their countries. Until now, very few countries have been successful in implementing Informatics or Computing at primary and lower secondary level. The spectrum from digital literacy to informatics, particularly as a discipline in its own right, has not really achieved a breakthrough and seems to be underrepresented for these age groups. The goal of this workshop is not only to discuss the anamnesis and diagnosis of this fragmented field, but also to discuss and suggest viable forms of therapy in form of setting educational standards. Making visible good practices in some countries and comparing successful approaches are rewarding tasks for this workshop. Discussing and defining common educational standards on a transcontinental level for the age group of 14 to 15 years old students in a readable, assessable and acceptable form should keep the participants of this workshop active beyond the limited time at the workshop. KW - Educational Standards KW - Digital Competence KW - Informatics Education KW - Computing KW - Lower Secondary Level Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-83008 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 425 EP - 431 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Miszalski, B. A1 - Manick, R. A1 - McBride, V. T1 - Post-common-envelope Wolf-Rayet central stars of planetary nebulae JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Nearly 50 post-common-envelope (post-CE) close binary central stars of planetary nebulae (CSPNe) are now known. Most contain either main sequence or white dwarf (WD) companions that orbit the WD primary in around 0.1–1.0 days. Only PN G222.8–04.2 and NGC 5189 have post-CE CSPNe with a Wolf-Rayet star primary (denoted [WR]), the low-mass analogues of massive Wolf-Rayet stars. It is not well understood how H-deficient [WR] CSPNe form, even though they are relatively common, appearing in over 100 PNe. The discovery and characterisation of post-CE [WR] CSPNe is essential to determine whether proposed binary formation scenarios are feasible to explain this enigmatic class of stars. The existence of post-CE [WR] binaries alone suggests binary mergers are not necessarily a pathway to form [WR] stars. Here we give an overview of the initial results of a radial velocity monitoring programme of [WR] CSPNe to search for new binaries. We discuss the motivation for the survey and the associated strong selection effects. The mass functions determined for PN G222.8–04.2 and NGC 5189, together with literature photometric variability data of other [WR] CSPNe, suggest that of the post-CE [WR] CSPNe yet to be found, most will have WD or subdwarf O/B-type companions in wider orbits than typical post-CE CSPNe (several days or months c.f. less than a day). Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88156 SP - 259 EP - 262 ER - TY - JOUR A1 - Moffat, Anthony F. J. T1 - General overview of Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Although we all use the name Wolf-Rayet to refer to specific groups of stars, “Wolf-Rayet” per se is really an astrophysical phenomenon of fast-moving, hot plasma, normally expanding around a hot star. However, expediency demands that we follow established traditions by referring to three specific kinds of WR stars: (1) cWR, “classical” He-burning descendants of massive, O-type stars, presumably all of which pass through a WR stage; (2) WNh, the most massive and luminous hydrogen-rich main-sequence stars with strong winds; and (3) [WR], the central stars of some 15 % of Planetary Nebulae. Wolf-Rayet stars are the epitome of relatively stable stars with the highest mass-loss rates for their kind. It behooves us to understand the what, how and why of this circumstance, along with its manyfold and fascinating consequences. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87552 SP - 13 EP - 18 ER - TY - JOUR A1 - Mohamed, S. A1 - Mackey, J. A1 - Langer, N. A1 - Podsiadlowski, Philipp T1 - Shaping the outflows of Wolf-Rayet stars JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Wolf-Rayet (WR) stars lose copious amounts of mass and momentum through dense stellar winds. The interaction of these outflows with their surroundings results in highly structured and complex circumstellar environments, often featuring knots, arcs, shells and spirals. Recent improvements in computational power and techniques have led to the development of detailed, multi-dimensional simulations that have given new insight into the origin of these structures, and better understanding of the physical mechanisms driving their formation. We review three of the main mechanisms that shape the outflows of WR stars: • interaction with the interstellar medium (ISM), i.e., wind-ISM interactions; • interaction with a stellar wind, either from a previous phase of evolution or the wind from a companion star, i.e., wind-wind interactions; • and interaction with a companion star that has a weak or insignificant outflow (e.g., a compact companion such as a neutron star or black hole), i.e.,wind-companion interactions. We also highlight the broader implications and impact of these circumstellar structures for related phenomena, e.g., for X-ray binaries and Gamma-ray bursts. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88200 SP - 283 EP - 288 ER - TY - JOUR A1 - Morris, P. W. T1 - Measuring η Carinae's High Mass Ejecta in the Infrared and Sub-millimeter JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - I address uncertainties on the spatial distribution and mass of the dust formed in η Carinae's Homunculus nebula with data being combined from several space- and ground-based facilities spanning near-infrared to sub-mm wavelengths, in terms of observational constraints and modeling. Until these aspects are better understood, the mass loss history and mechanisms responsible for η Car's enormous eruption(s) remain poorly constrained. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87895 SP - 155 EP - 158 ER - TY - JOUR A1 - Munoz, M. A1 - Moffat, Anthony F. J. A1 - Hill, G. M. A1 - Richardson, N. D. A1 - Pablo, H. T1 - The missing Wolf-Rayet X-ray binary systems JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We investigate the rarity of the Wolf-Rayet X-ray binaries (WRXRBs) in contrast to their predecessors, the high mass X-ray binaries (HMXRBs). Recent studies suggest that common envelope (CE) mergers during the evolution of a HMXRBs may be responsible (Linden et al. 2012). We conduct a binary population synthesis to generate a population of HMXRBs mimicking the Galactic sample and vary the efficiency parameter during the CE phase to match the current WRXRB to HMXRB ratio. We find that ∼50% of systems must merge to match observational constraints. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88082 SP - 225 EP - 228 ER - TY - JOUR A1 - Najarro, F. A1 - de la Fuente, D. A1 - Geballe, T. R. A1 - Figer, D. F. A1 - Hillier, D. J. T1 - The WR population in the Galactic Center JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The Galactic Center (GC) hosts three of the most massive WR rich, resolved young clusters in the Local Group as well as a large number of apparently isolated massive stars. Therefore, it constitutes a test bed to study the star formation history of the region, to probe a possible top-heavy scenario and to address massive star formation (clusters vs isolation) in such a dense and harsh environment. We present results from our ongoing infrared spectroscopic studies of WRs and other massive stars at the Center of the Milky Way. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87794 SP - 113 EP - 116 ER - TY - JOUR A1 - Neugent, K. F. A1 - Massey, P. A1 - Hillier, D. J. A1 - Morrell, N. I. T1 - The Discovery and Physical Parameterization of a New Type of Wolf-Rayet Star JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - As part of our ongoing Wolf-Rayet (WR) Magellanic Cloud survey, we have discovered 13 new WRs. However, the most exciting outcome of our survey is not the number of new WRs, but their unique characteristics. Eight of our discoveries appear to belong to an entirely new class of WRs. While one might naively classify these stars as WN3+O3V binaries, such a pairing is unlikely. Preliminary CMFGN modeling suggests physical parameters similar to early-type WNs in the Large Magellanic Cloud except with mass-loss rates three to five times lower and slightly higher temperatures. The evolution status of these stars remains an open question. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87766 SP - 101 EP - 104 ER - TY - JOUR A1 - Ohrndorf, Laura T1 - Assignments in Computer Science Education BT - Results of an Analysis of Textbooks, Curricula and other Resources JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - In this paper we describe the recent state of our research project concerning computer science teachers’ knowledge on students’ cognition. We did a comprehensive analysis of textbooks, curricula and other resources, which give teachers guidance to formulate assignments. In comparison to other subjects there are only a few concepts and strategies taught to prospective computer science teachers in university. We summarize them and given an overview on our empirical approach to measure this knowledge. KW - Pedagogical content knowledge KW - computer science teachers KW - students’ knowledge KW - students’ conceptions Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82868 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 327 EP - 333 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Opel, Simone T1 - On the Way to a “General Model of Contextualised Computer Science Education” BT - A Criteria-based Comparison of “Computer Science in Context” and the Concept of “Learning Fields” JF - KEYCIT 2014 - Key Competencies in Informatics and ICT KW - Vocational Education KW - Secondary Education KW - Computer Science Education KW - Learning Fields KW - Contextualisation KW - Computer Science in Context KW - Activity-orientated Learning Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82953 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 397 EP - 400 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Opel, Simone A1 - Kramer, Matthias A1 - Trommen, Michael A1 - Pottbäcker, Florian A1 - Ilaghef, Youssef T1 - BugHunt BT - A Motivating Approach to Self-Directed Problem-solving in Operating Systems JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - Competencies related to operating systems and computer security are usually taught systematically. In this paper we present a different approach, in which students have to remove virus-like behaviour on their respective computers, which has been induced by software developed for this purpose. They have to develop appropriate problem-solving strategies and thereby explore essential elements of the operating system. The approach was implemented exemplarily in two computer science courses at a regional general upper secondary school and showed great motivation and interest in the participating students. KW - Educational software KW - operating system KW - student activation KW - problem-solving KW - interactive course KW - interactive workshop KW - edutainment KW - secondary computer science education Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82693 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 217 EP - 233 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Or-Bach, Rachel T1 - Programming for Non-Programmers BT - Fostering Comprehension Capabilities by Employing a PRS JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The study reported in this paper involved the employment of specific in-class exercises using a Personal Response System (PRS). These exercises were designed with two goals: to enhance students’ capabilities of tracing a given code and of explaining a given code in natural language with some abstraction. The paper presents evidence from the actual use of the PRS along with students’ subjective impressions regarding both the use of the PRS and the special exercises. The conclusions from the findings are followed with a short discussion on benefits of PRS-based mental processing exercises for learning programming and beyond. KW - Novice programmers KW - comprehension KW - tracing KW - personal response systems Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82875 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 335 EP - 342 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Pablo, H. A1 - Moffat, Anthony F. J. T1 - WR Time Series Photometry BT - A Forest of Possibilities JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We take a comprehensive look at Wolf Rayet photometric variability using the MOST satellite. This sample, consisting of 6 WR stars and 6 WC stars defies all typical photometric analysis. We do, however, confirm the presence of unusual periodic signals resembling sawtooth waves which are present in 11 out of 12 stars in this sample. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88031 SP - 205 EP - 208 ER - TY - JOUR A1 - Passig, David A1 - Tzuriel, David A1 - Kedmi, Ganit Eshel T1 - Improving children’s Cognitive Modifiability through Mediated Learning and Dynamic Assessment within 3D Immersive Virtual Reality Environment JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The objectives of this study were to examine (a) the effect of dynamic assessment (DA) in a 3D Immersive Virtual Reality (IVR) environment as compared with computerized 2D and noncomputerized (NC) situations on cognitive modifiability, and (b) the transfer effects of these conditions on more difficult problem solving administered two weeks later in a non-computerized environment. A sample of 117 children aged 6:6-9:0 years were randomly assigned into three experimental groups of DA conditions: 3D, 2D, and NC, and one control group (C). All groups received the pre- and post-teaching Analogies subtest of the Cognitive Modifiability Battery (CMB-AN). The experimental groups received a teaching phase in conditions similar to the pre-and post-teaching phases. The findings showed that cognitive modifiability, in a 3D IVR, was distinctively higher than in the two other experimental groups (2D computer group and NC group). It was also found that the 3D group showed significantly higher performance in transfer problems than the 2D and NC groups. KW - Dynamic assessment KW - mediated learning experience KW - cognitive modifiability KW - analogical thinking KW - virtual reality Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82705 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 235 EP - 252 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Preston, Christina A1 - Younie, Sarah T1 - Mentoring in a Digital World BT - What are the Issues? JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - This paper focuses on the results of the evaluation of the first pilot of an e-mentoring unit designed by the Hands-On ICT consortium, funded by the EU LLL programme. The overall aim of this two-year activity is to investigate the value for professional learning of Massive Online Open Courses (MOOCs) and Community Online Open Courses (COOCs) in the context of a ‘community of practice’. Three units in the first pilot covered aspects of using digital technologies to develop creative thinking skills. The findings in this paper relate to the fourth unit about e-mentoring, a skill that was important to delivering the course content in the other three units. Findings about the e-mentoring unit included: the students’ request for detailed profiles so that participants can get to know each other; and, the need to reconcile the different interpretations of e-mentoring held by the participants when the course begins. The evaluators concluded that the major issues were that: not all professional learners would self-organise and network; and few would wish to mentor their colleagues voluntarily. Therefore, the e-mentoring issues will need careful consideration in pilots two and three to identify how e-mentoring will be organised. KW - MOOCs KW - e-mentoring KW - professional development KW - ICT skills KW - user-centred Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82895 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 343 EP - 350 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Rajner, Mirjam T1 - Zinovii Tolkatchev’s „Jesus in Majdanek“ BT - A Soviet-Jewish Artist Confronting the Holocaust JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [21 (2015)] = Jesus in den Jüdischen Kulturen des 19. und 20. Jahrhunderts JF - PaRDeS : Journal of the Association of Jewish Studies [21 (2015)] = Jesus in the Jewish cultures of the 19th and 20th century N2 - Zinovii Shenderovich Tolkatchev (1903–1977), ein sowjetischer Künstler jüdischer Herkunft, kreierte 1945 eine eindrucksvolle Serie von fünf Bildern mit dem Titel “Jesus in Majdanek”. Die Serie war der Höhepunkt von Tolkatchevs intensiver Auseinandersetzung mit den Erfahrungen, die er als Soldat der Roten Armee, während der Befreiung der Konzentrationslager Majdanek und Auschwitz gemacht hatte. Schockiert von dem dort Gesehenen, zeigt er Jesus als Lagerinsassen, der eine gestreifte Uniform trägt, die alle nur möglichen Diffamierungszeichen aufweist – den jüdischen gelben Stern, das rote Dreieck politischer Gefangener und die individuelle Gefangenennummer. Die numerische Tätowierung am Unterarm ist auch zu sehen. Die verschiedenen Abschnitte des Lagerlebens werden als die der traditionellen Passion Christi dargestellt. Während der Künstler die verschiedenen Phasen des Leidens Jesu kanonisch portraitiert, basiert sein künstlerisches Schaffen auf den der bekannten Malereien der europäischen Renaissance. Der Artikel platziert Tolkatchevs Bilderserie in einem breiteren kulturellen und visuellen Kontext, da er sowohl die Entwicklung des ‚historischen Jesu‘ typisch für das Denkbild des Europas des 19. Jahrhunderts und der Kunst des Russischem Realismus als auch den Einfluss der deutschen Avantgarde, untersucht. Dadurch bietet sich ein tiefsinnigeres Verstehen von Tolkatchevs Arbeit und ihrer universellen Botschaft. N2 - In 1945, Zinovii Shenderovich Tolkatchev (1903–1977), a Soviet artist of Jewish origin, created a striking series of five images entitled “Jesus in Majdanek”. The series was the culmination of Tolkatchev‘s intensive preoccupation with the experience he, as a Red Army soldier, endured upon taking part in liberation of the concentration camps Majdanek and Auschwitz. Shocked by the actual sights he witnessed, he depicted Jesus as an actual camp inmate, wearing a striped uniform marked by every possible defamation sign – the Jewish yellow star, the red triangle of political prisoners, and the individual prison number, the numerical tattoo on his lower arm can also be seen. The different stages of camp life are portrayed as the traditional Passion of Christ. While showing the actual situations the artist based himself upon the well known European Renaissance paintings canonically depicting Jesus‘ suffering. The article places Tolkatchev‘s series in a broader cultural and visual context by exploring the development of the ‘historical Jesus’ in the 19th century European thought and Russian realist art, and by examining the impact of the German avant-garde. By doing so, a deeper understanding of the universal message Tolkatchev’s works entail is offered. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-85794 SN - 978-3-86956-331-2 SN - 1614-6492 SN - 1862-7684 VL - 21 SP - 59 EP - 85 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Ramírez Alegría, S. A1 - Chené, A.-N. A1 - Borissova, J. A1 - Kurtev, R. A1 - Navarro, C. A1 - Kuhn, M. A1 - Carballo-Bello, J. A. T1 - A not so massive cluster hosting a very massive star JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present the first physical characterization of the young open cluster VVVCL041. We spectroscopically observed the cluster main-sequence stellar population and a very-massive star candidate: WR62-2. CMFGEN modelling to our near-infrared spectra indicates that WR62-2 is a very luminous (10^6.4±0.2 L⊙)and massive (∼ 80M⊙) star. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88477 SP - 362 ER - TY - JOUR A1 - Reyes-Iturbide, J. A1 - Velázquez, Pablo F. A1 - Rosado, M. T1 - 3D numerical model for NGC 6888 Nebula JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We present 3D numerical simulations of the NGC6888 nebula considering the proper motion and the evolution of the star, from the red supergiant (RSG) to the Wolf-Rayet (WR) phase. Our simulations reproduce the limb-brightened morphology observed in [OIII] and X-ray emission maps. The synthetic maps computed by the numerical simulations show filamentary and clumpy structures produced by instabilities triggered in the interaction between the WR wind and the RSG shell. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88485 SP - 363 ER - TY - JOUR A1 - Reyes-Pérez, J. A1 - Morisset, C. A1 - Pena, M. A1 - Mesa-Delgado, A. T1 - A consistent spectral model of WR 136 and its associated bubble NGC 6888 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We analyse whether a stellar atmosphere model computed with the code CMFGEN provides an optimal description of the stellar observations of WR 136 and simultaneously reproduces the nebular observations of NGC 6888, such as the ionization degree, which is modelled with the pyCloudy code. All the observational material available (far and near UV and optical spectra) were used to constrain such models. We found that the stellar temperature T∗, at τ = 20, can be in a range between 70 000 and 110 000 K, but when using the nebula as an additional restriction, we found that the stellar models with T∗ ∼ 70 000 K represent the best solution for both, the star and the nebula. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88274 SP - 321 EP - 324 ER - TY - JOUR A1 - Reynolds, Nicholas A1 - Swainston, Andrew A1 - Bendrups, Faye T1 - Music Technology and Computational Thinking BT - Young People displaying Competence JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - A project involving the composition of a number of pieces of music by public participants revealed levels of engagement with and mastery of complex music technologies by a number of secondary student volunteers. This paper reports briefly on some initial findings of that project and seeks to illuminate an understanding of computational thinking across the curriculum. KW - Computational Thinking KW - Music Technology KW - ICT Competence KW - Young People Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82913 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 363 EP - 370 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Ro, S. A1 - Matzner, C. D. T1 - Envelope Inflation or Stellar Wind? JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We an optically-thick, transonic, steady wind model for a H-free Wolf-Rayet star. A bifurcation is found across a critical mass loss rate Mb. Slower winds M < Mb extend by several hydrostatic stellar radii, reproduce features of envelope in ation from Petrovic et al. (2006) and Gräfener et al. (2012), and are energetically unbound. This work is of particular interest for extended envelopes and winds, radiative hydrodynamic instabilities (eg. wind stagnation, clumping, etc.), and NLTE atmospheric models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88491 SP - 364 ER - TY - JOUR A1 - Roman-Lopes, A. A1 - Franco, G. A. P. A1 - Sanmartin, D. T1 - SOAR Near-Infrared and Optical Survey of OIf* and OIf*/WN Stars in the Periphery of Galactic Massive Star Forming Regions JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - In this contribution we present some preliminary results obtained from a SOAR-Goodman optical spectroscopic survey aimed to confirm the OIf* - OIf*/WN nature of a sample of Galactic candidates that were previously confirmed as massive stars based on near-infrared spectra taken with OSIRIS at SOAR. With only a few of such stars known in the Galaxy to date, our study significantly contributes to improve the number of known Galactic O2If* stars, as well as almost doubling the number of known members of the galactic sample of the rare type OIf*/WN. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87585 SP - 31 EP - 34 ER - TY - JOUR A1 - Rosenzweig, Claudia T1 - When Jesus Spoke Yiddish BT - Some Remarks on a Yiddish Manuscript of the “Toledot Yeshu” (MS. Günzburg 1730) JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien [21 (2015)] = Jesus in den Jüdischen Kulturen des 19. und 20. Jahrhunderts JF - PaRDeS : Journal of the Association of Jewish Studies [21 (2015)] = Jesus in the Jewish cultures of the 19th and 20th century N2 - Im folgenden Artikel sollen exemplarische Passagen eines der jiddischen “Toldot- Yeshu”-Manuskripte diskutiert werden, das bis zum gegenwärtigen Zeitpunkt noch nicht wissenschaftlich untersucht wurde: Die Handschrift mit der Signatur MS. Günzburg 1730 wird in der Russischen Staatsbibliothek in Moskau aufbewahrt und in das 17. Jahrhundert datiert. Das Manuskript ist in die sogenannte ‚Herodes Tradition‘ der “Toledot Yeshu” einzuordnen. Demzufolge ist die vorliegende jiddische Handschrift MS. Günzburg 1730 mit der hebräisch gedruckten Version verwandt, die zusammen mit einer lateinischen Übersetzung von dem Schweizer Pastoren und Theologen Johann Jacob Uldrich (Huldricus, 1683–1731) im Jahre 1705 in Leiden unter dem Titel “Historia Jeschuae Nazareni” publiziert wurde. Obschon die genaue Datierung der jiddischen Handschrift nicht möglich ist, erlauben exemplarische Vergleiche zwischen den hebräischen und den jiddischen Texten dennoch spezifische Merkmale der jiddischen Version herauszustellen, und Fragen über die Übermittlung und der Rezeption dieses anspruchsvollen und interessanten Textes aufzuwerfen. N2 - In this paper, I wish to bring some evidences from a Yiddish manuscript of the “Toledot Yeshu” which has not yet been the object of research: MS. Günzburg, 1730 kept in the Russian State Library in Moscow and dated 17th century. The manuscript is part of the so-called ‘Herode-tradition’ of the “Toledot Yeshu”. This means that the Yiddish manuscript is connected to the version printed in Hebrew and accompanied by a Latin translation by the Swiss pastor and theologian Johann Jacob Uldrich (Huldricus, 1683–1731) in Leiden in 1705, bearing the title “Historia Jeschuae Nazareni”. Given the uncertainty about the exact dating of the Yiddish manuscript, a comparison between the Hebrew and the Yiddish can still allow some remarks concerning the characteristics of the Yiddish version and posit some questions about the transmission and the reception of this challenging and intriguing text. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-85881 SN - 978-3-86956-331-2 SN - 1614-6492 SN - 1862-7684 VL - 21 SP - 199 EP - 214 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Rosslowe, C. K. A1 - Crowther, P. A. A1 - Clark, J. S. A1 - Negueruela, I. T1 - Physical properties of the WR stars in Westerlund 1 JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The Westerlund 1 (Wd1) cluster hosts a rich and varied collection of massive stars. Its dynamical youth and the absence of ongoing star formation indicate a coeval population. As such, the simultaneous presence of both late-type supergiants and Wolf-Rayet stars has defied explanation in the context of single-star evolution. Observational evidence points to a high binary fraction, hence this stellar population offers a robust test for stellar models accounting for both single-star and binary evolution. We present an optical to near-IR (VLT & NTT) spectroscopic analysis of 22 WR stars in Wd 1, delivering physical properties for the WR stars. We discuss how these differ from the Galactic field population, and how they may be reconciled with the predictions of single and binary evolutionary models. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87779 SP - 105 EP - 108 ER - TY - JOUR A1 - Russell, C. M. P. A1 - Corcoran, M. F. A1 - Cuadra, J. A1 - Owocki, S. P. A1 - Wang, Q. D. A1 - Hamaguchi, K. A1 - Sugawara, Y. A1 - Pollock, A. M. T. A1 - Kallman, T. R. T1 - Hydrodynamic and radiative transfer modeling of X-ray emission from colliding WR winds BT - WR 140 & the Galactic center JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Colliding Wolf-Rayet (WR) winds produce thermal X-ray emission widely observed by X-ray telescopes. In wide WR+O binaries, such as WR 140, the X-ray flux is tied to the orbital phase, and is a direct probe of the winds’ properties. In the Galactic center, ~30 WRs orbit the super massive black hole (SMBH) within ~10”, leading to a smorgasbord of wind-wind collisions. To model the X-ray emission of WR 140 and the Galactic center, we perform 3D hydrodynamic simulations to trace the complex gaseous flows, and then carry out 3D radiative transfer calculations to compute the variable X-ray spectra. The model WR 140 RXTE light curve matches the data well for all phases except the X-ray minimum associated with periastron, while the model spectra agree with the RXTE hardness ratio and the shape of the Suzaku observations throughout the orbit. The Galactic center model of the Chandra flux and spectral shape match well in the region r ≤ 3”, but the model flux falls off too rapidly beyond this radius. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88255 SP - 309 EP - 312 ER - TY - JOUR A1 - Saito, Toshinori T1 - The Key Competencies in Informatics and ICT viewed from Nussbaum’s Ten Central Capabilities JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - This article shows a discussion about the key competencies in informatics and ICT viewed from a philosophical foundation presented by Martha Nussbaum, which is known as ‘ten central capabilities’. Firstly, the outline of ‘The Capability Approach’, which has been presented by Amartya Sen and Nussbaum as a theoretical framework of assessing the state of social welfare, will be explained. Secondly, the body of Nussbaum’s ten central capabilities and the reason for being applied as the basis of discussion will be shown. Thirdly, the relationship between the concept of ‘capability’ and ‘competency’ is to be discussed. After that, the author’s assumption of the key competencies in informatics and ICT led from the examination of Nussbaum’s ten capabilities will be presented. KW - Capability approach KW - competency KW - teaching informatics in general education KW - philosophical foundation of informatics pedagogy KW - education and public policy Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82718 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 253 EP - 266 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Sanyal, D. A1 - Moriya, T. J. A1 - Langer, N. T1 - Envelope inflation in Wolf-Rayet stars and extended supernova shock breakout signals JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - Massive, luminous stars reaching the Eddington limit in their interiors develop very dilute, extended envelopes. This effect is called envelope inflation. If the progenitors of Type Ib/c supernovae, which are believed to be Wolf-Rayet (WR) stars, have inflated envelopes then the shock breakout signals diffuse in them and can extend their rise times significantly. We show that our inflated, hydrogen-free, WR stellar models with a radius of ∼R⊙ can have shock breakout signals longer than ∼ 60 s. The puzzlingly long shock breakout signal observed in the Type Ib SN 2008D can be explained by an inflated progenitor envelope, and more such events might argue in favour of existence of inflated envelopes in general. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88062 SP - 213 EP - 216 ER - TY - JOUR A1 - Schiller, Thomas T1 - Teaching Information Security (as Part of Key Competencies) BT - The Situation in Austria JF - KEYCIT 2014 - Key Competencies in Informatics and ICT N2 - The poster and abstract describe the importance of teaching information security in school. After a short description of information security and important aspects, I will show, how information security fits into different guidelines or models for computer science educations and that it is therefore on of the key competencies. Afterwards I will present you a rough insight of teaching information security in Austria. KW - Teaching information security KW - key competencies KW - computer science education KW - Austria Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-82960 SN - 1868-0844 SN - 2191-1940 IS - 7 SP - 401 EP - 404 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Shacham, T. A1 - Idan, I. A1 - Shaviv, N. J. T1 - A new mechanism for long long-term pulsations of hot stars? JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - We suggest several ideas which when combined could lead to a new mechanism for long-term pulsations of very hot and luminous stars. These involve the interplay between convection, radiation, atmospheric clumping and winds, which collectively feed back to stellar expansion and contraction. We discuss these ideas and point out the future work required in order to fill in the blanks. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88058 SP - 209 EP - 212 ER - TY - JOUR A1 - Sokal, K. R. A1 - Johnson, K. E. A1 - Massey, P. A1 - Indebetouw, R. T1 - The importance of Wolf-Rayet ionization and feedback on super star cluster evolution JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The feedback from massive stars is important to super star cluster (SSC) evolution and the timescales on which it occurs. SSCs form embedded in thick material, and eventually, the cluster is cleared out and revealed at optical wavelengths – however, this transition is not well understood. We are investigating this critical SSC evolutionary transition with a multi-wavelength observational campaign. Although previously thought to appear after the cluster has fully removed embedding natal material, we have found that SSCs may host large populations of Wolf-Rayet stars. These evolved stars provide ionization and mechanical feedback that we hypothesize is the tipping point in the combined feedback processes that drive a SSC to emerge. Utilizing optical spectra obtained with the 4m Mayall Telescope at Kitt Peak National Observatory and the 6.5m MMT, we have compiled a sample of embedded SSCs that are likely undergoing this short-lived evolutionary phase and in which we confirm the presence of Wolf-Rayet stars. Early results suggest that WRs may accelerate the cluster emergence. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-88325 SP - 337 EP - 340 ER - TY - JOUR A1 - Srivastava, S. A1 - Kehrig, C. A1 - Kantharia, N. G. A1 - Pérez-Montero, E. A1 - Vílchez, J. M. A1 - Iglesias-Páramo, J. A1 - Janardhan, P. T1 - A 2D view of Wolf-Rayet Galaxies JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - The main objective of this work is to investigate the evolution of massive stars, and the interplay between them and the ionized gas for a sample of local metal-poor Wolf-Rayet galaxies. Optical integral field spectrocopy was used in combination with multi-wavelength radio data. Combining optical and radio data, we locate Wolf-Rayet stars and supernova remnants across the Wolf-Rayet galaxies to study the spatial correlation between them. This study will shed light on the massive star formation and its feedback, and will help us to better understand distant star-forming galaxies. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87650 SP - 59 EP - 62 ER - TY - JOUR A1 - St-Louis, N. T1 - Studying Large and Small Scale Wind Asymmetries with Spectroscopy and Polarimetry JF - Wolf-Rayet Stars : Proceedings of an International Workshop held in Potsdam, Germany, 1.–5. June 2015 N2 - In this paper, I review observational evidence from spectroscopy and polarimetry for the presence of small and large scale structure in the winds of Wolf-Rayet (WR) stars. Clumping is known to be ubiquitous in the winds of these stars and many of its characteristics can be deduced from spectroscopic time-series and polarisation lightcurves. Conversely, a much smaller fraction of WR stars have been shown to harbour larger scale structures in their wind (∼ 1/5) while they are thought to be present is the winds of most of their O-star ancestors. The reason for this difference is still unknown. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-87726 SP - 79 EP - 84 ER -