TY - JOUR A1 - Yoon, S.-C. A1 - Langer, Norbert A1 - Scheithauer, S. T1 - Effects of rotation on the helium burning shell source in accreting white dwarfs N2 - We investigate the effects of rotation on the behavior of the helium-burning shell source in accreting carbon- oxygen white dwarfs, in the context of the single degenerate Chandrasekhar mass progenitor scenario for type la supernovae (SNe Ia). We model the evolution of helium-accreting white dwarfs of initially 1 M-circle dot, assuming four different constant accretion rates (2, 3, 5 and 10 x 10(-7) M-circle dot/yr). In a one-dimensional approximation, we compute the mass accretion and subsequent nuclear fusion of helium into carbon and oxygen, as well as angular momentum accretion, angular momentum transport inside the white dwarf, and rotationally induced chemical mixing. Our models show two major effects of rotation: a) The helium-burning nuclear shell source in the rotating models is much more stable than in corresponding non-rotating models - which increases the likelihood that accreting white dwarfs reach the stage of central carbon ignition. This effect is mainly due to rotationally induced mixing at the CO/He interface which widens the shell source, and due to the centrifugal force lowering the density and degeneracy at the shell source location. b) The C/O-ratio in the layers which experience helium shell burning - which may affect the energy of an SN Ia explosion - is strongly decreased by the rotationally induced mixing of a-particles into the carbon-rich layers. We discuss implications of our results for the evolution of SNe la progenitors Y1 - 2004 SN - 0004-6361 ER - TY - JOUR A1 - Clegg, Mark R. A1 - Maberly, Stephen C A1 - Jones, Roger I. T1 - Chemosensory behavioural response of freshwater phytoplanktonic flagellates Y1 - 2003 ER - TY - INPR A1 - Liperovsky, V.A. A1 - Pochotelov, O.A. A1 - Liperovskaya, E.V. A1 - Parrot, M. A1 - Meister, C.-V. A1 - Alimov, O. A. T1 - Modifications of sporadic E-layers caused by seismic activity N2 - Contents: 1 Introduction 2 Formation and destruction of sporadic E-layers 3 Temporal variations of parameters of sporadic E-layers during earthquake preparation 3.1 Temporal variations of fbEs with time-scales of a few hours 3.2 Study of fbEs variations with characteristic time-scales of 0.5-3 hours 3.3 Variations of the parameters of sporadic E-layers with characteristic time-scales of 15-45 minutes 3.4 Sporadic E-layer variations with characteristic time-scales of 2-15 minutes 4 On the spatial scales of sporadic E-layer disturbances related to seismic activity 5 Complex experimental researches of the ionosphere, electromagnetic noise and the geomagnetic field 5.1 Ionospheric and electromagnetic phenomena of the Kayraccum earthquake in 1985 5.2 Comparison of anomalies with characteristic time-scales of 2-3 hours for ionospheric E- and F-layers, and temporal behaviour of electromagnetic noise emission intensity 5.3 Night airglow emissions in the E-region before earthquakes and sporadic E-layer variations 6 Physical models of lithosphere-ionosphere links 6.1 Lithosphere-ionosphere links due to AGW 6.2 Electromagnetic models for the lithosphere-ionosphere coupling 6.3 Sporadic E-layers as current generators 7 Discussion and conclusion T3 - NLD Preprints - 49 Y1 - 1998 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-14799 ER - TY - JOUR A1 - Hasenbring, Monika Ilona A1 - Levenig, Claudia A1 - Hallner, D. A1 - Puschmann, Anne-Katrin A1 - Weiffen, A. A1 - Kleinert, Jens A1 - Belz, J. A1 - Schiltenwolf, Marcus A1 - Pfeifer, A. -C. A1 - Heidari, Jahan . A1 - Kellmann, M. A1 - Wippert, Pia-Maria T1 - Psychosoziale Risikofaktoren für chronischen Rückenschmerz in der Allgemeingesellschaft und im Leistungssport T1 - Psychosocial Risk Factors for chronic Back Pain in the General Population and in Competitive Sports BT - Von der Modellbildung zum klinischen Screening – ein Review aus dem MiSpEx-Netzwerk BT - From theory to clinical screening—a review from the MiSpEx network A Review from the MiSpEx Network JF - Manuelle Medizin N2 - Hintergrund Lumbale Ruckenschmerzen und ihre Neigung zur Chronifizierung stellen nicht nur in der Allgemeinbevolkerung, sondern auch im Leistungssport ein bedeutendes Gesundheitsproblem dar. Im Gegensatz zu Nichtathleten ist die Erforschung psychosozialer Risikofaktoren sowie von Screeningfragebogen, die moglichst fruhzeitig die Entwicklung chronischer Schmerzen erkennen und vorhersagen konnen, im Leistungssport noch in den Anfangen. Das vorliegende systematische Review gibt einen uberblick uber den Stand der Risikofaktorenforschung in beiden Feldern und untersucht die pradiktive Qualitat verschiedener Screeningfragebogen bei Nichtathleten. Methodik Die Literatursuche erfolgte zwischen Marz und Juni 2016 in den Datenbanken MEDLINE, PubMed und PsycINFO mit den Suchbegriffen psychosocial screening, low back pain, sciatica und prognosis, athletes. Eingeschlossen wurden prospektive Studien an Patienten mit lumbalen Ruckenschmerzen mit und ohne Ausstrahlung in das Bein, 18Jahre und mit einem Follow-up von mindestens 3-monatiger Dauer. Ergebnisse In das Review zu Screeninginstrumenten wurden 16Studien einbezogen. Alle waren an klinischen Stichproben der Allgemeingesellschaft durchgefuhrt worden. Zu den am haufigsten publizierten Screeningfragebogen gehoren der orebro Musculoskeletal Pain Screening Questionnaire (oMPSQ) mit einer zufriedenstellenden Fruherkennung der Wiederherstellung der Arbeitsfahigkeit sowie das STarT Back Screening Tool (SBT) mit guter Vorhersage schmerzbedingter Beeintrachtigung. Fur die Vorhersage kunftiger Schmerzen eignen sich die Risikoanalyse der Schmerzchronifizierung (RISC-R) und der Heidelberger Kurzfragebogen (HKF). Schlussfolgerungen Psychosoziale Risikofaktoren fur chronische Ruckenschmerzen, wie z.B. chronischer Stress, ungunstige Schmerzverarbeitung und depressive Stimmungslagen, werden zunehmend auch im Leistungssport erkannt. Screeninginstrumente, die sich in der Allgemeingesellschaft als hinreichend vorhersagestark erwiesen haben, werden aktuell im MiSpEx-Forschungsverbund auf ihre Eignung uberpruft. N2 - Background Lumbar back pain and the high risk of chronic complaints is not only an important health concern in the general population but also in high performance athletes. In contrast to non-athletes, there is a lack of research into psychosocial risk factors in athletes. Moreover, the development of psychosocial screening questionnaires that would be qualified to detect athletes with a high risk of chronicity is in the early stages. The purpose of this review is to give an overview of research into psychosocial risk factors in both populations and to evaluate the performance of screening instruments in non-athletes. Methods The databases MEDLINE, PubMed, and PsycINFO were searched from March to June 2016 using the keywords “psychosocial screening”, “low back pain”, “sciatica” and “prognosis”, “athletes”. We included prospective studies conducted in patients with low back pain with and without radiation to the legs, aged ≥18 years and a follow-up of at least 3 months. Results We identified 16 eligible studies, all of them conducted in samples of non-athletes. Among the most frequently published screening questionnaires, the Örebro Musculoskeletal Pain Screening Questionnaire (ÖMPSQ) demonstrated a sufficient early prediction of return to work and the STarT Back Screening Tool (SBT) revealed acceptable performance predicting pain-related impairment. The prediction of future pain was sufficient with the Risk Analysis of Back Pain Chronification (RISC-BP) and the Heidelberg Short Questionnaire (HKF). Conclusion Psychosocial risk factors of chronic back pain, such as chronic stress, depressive mood, and maladaptive pain processing are becoming increasingly more recognized in competitive sports. Screening instruments that have been shown to be predictive in the general population are currently being tested for suitability in the German MiSpEx research consortium. KW - Chronischer Rückenschmerz KW - Psychosoziale Risikofaktoren KW - Screening KW - Prognose KW - Chronic back pain KW - Psychosocial risk factors KW - Screening KW - Prognosis Y1 - 2018 U6 - https://doi.org/10.1007/s00337-018-0450-1 SN - 0025-2514 SN - 1433-0466 VL - 56 IS - 5 SP - 359 EP - 373 PB - Springer CY - Heidelberg ER - TY - JOUR A1 - Hasenbring, Monika Ilona A1 - Levenig, Claudia A1 - Hallner, D. A1 - Puschmann, Anne-Katrin A1 - Weiffen, A. A1 - Kleinert, Jens A1 - Belz, J. A1 - Schiltenwolf, Marcus A1 - Pfeifer, A. -C. A1 - Heidari, Jahan A1 - Kellmann, M. A1 - Wippert, Pia-Maria T1 - Psychosocial risk factors for chronic back pain in the general population and in competitive sports BT - from theory to clinical screening- a review fromthe MiSpEx network BT - Von der Modellbildung zum klinischen Screening – ein Review aus dem MiSpEx-Netzwerk JF - Der Schmerz : Organ der Deutschen Gesellschaft zum Studium des Schmerzes, der Österreichischen Schmerzgesellschaft und der Deutschen Interdisziplinären Vereinigung für Schmerztherapie N2 - Lumbar back pain and the high risk of chronic complaints is not only an important health concern in the general population but also in high performance athletes. In contrast to non-athletes, there is a lack of research into psychosocial risk factors in athletes. Moreover, the development of psychosocial screening questionnaires that would be qualified to detect athletes with a high risk of chronicity is in the early stages. The purpose of this review is to give an overview of research into psychosocial risk factors in both populations and to evaluate the performance of screening instruments in non-athletes. The databases MEDLINE, PubMed, and PsycINFO were searched from March to June 2016 using the keywords "psychosocial screening", "low back pain", "sciatica" and "prognosis", "athletes". We included prospective studies conducted in patients with low back pain with and without radiation to the legs, aged ae18 years and a follow-up of at least 3 months. We identified 16 eligible studies, all of them conducted in samples of non-athletes. Among the most frequently published screening questionnaires, the A-rebro Musculoskeletal Pain Screening Questionnaire (A-MPSQ) demonstrated a sufficient early prediction of return to work and the STarT Back Screening Tool (SBT) revealed acceptable performance predicting pain-related impairment. The prediction of future pain was sufficient with the Risk Analysis of Back Pain Chronification (RISC-BP) and the Heidelberg Short Questionnaire (HKF). Psychosocial risk factors of chronic back pain, such as chronic stress, depressive mood, and maladaptive pain processing are becoming increasingly more recognized in competitive sports. Screening instruments that have been shown to be predictive in the general population are currently being tested for suitability in the German MiSpEx research consortium. T2 - Psychosoziale Risikofaktoren für chronischen Rückenschmerz in der Allgemeingesellschaft und im Leistungssport KW - Chronic back pain KW - Psychosocial risk factors KW - Screening KW - Prognosis Y1 - 2018 U6 - https://doi.org/10.1007/s00482-018-0307-5 SN - 0932-433X SN - 1432-2129 VL - 32 IS - 4 SP - 259 EP - 273 PB - Springer CY - Heidelberg ER - TY - GEN A1 - Tristram, Hildegard L.C. T1 - Wie weit sind die inselkeltischen Sprachen (und das Englische) analytisiert? T1 - How far have the Insular Celtic languages (and the English language) been analyticised? N2 - Der gemeinsame Wandel der inselkeltischen Sprachen wie auch des Englischen vom vorwiegend synthetischen Typus zum vorwiegend analytischen Typus läßt sich vermutlich auf einen ca. 1500 Jahre dauernden intensiven Sprachenkontakt zwischen diesen Sprachen zurückführen. Heute ist das Englische die analytischste Sprache der Britischen Inseln und Irlands, gefolgt vom Walisischen, Bretonischen und Irischen. Letzteres ist von den genannten Sprachen noch am weitesten morphologisch komplex. N2 - I discuss the joint shift of the Insular Celtic languages and of the English language from, typologically speaking, predominantly synthetic languages c. 1500 years ago to predominantly analytical languages today. The demise of the inflectional morphology is most advanced in Present Day English. Welsh follows suit. Then come Breton and Irish. Intensive linguistic interaction across the boundaries of the Germanic and the Insular Celtic languages are proposed to have been instrumental for this type of linguistic convergence. T3 - Zweitveröffentlichungen der Universität Potsdam : Philosophische Reihe - 35 KW - Irisch KW - Walisisch KW - Bretonisch KW - Englisch KW - Sprachwandel KW - Sprachkontakt KW - Sprachkonvergenz KW - Typologie KW - Morphologie KW - Komplexität KW - Quantifizierun KW - Irish KW - Welsh KW - Breton KW - English KW - Language Change KW - Language Contact KW - Convergence KW - Morphology KW - Complexity KW - Quantification Y1 - 2009 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-41251 ER - TY - CHAP A1 - Walter, R. A1 - Zurita-Heras, J. A1 - Leyder, J.-C. T1 - Probing clumpy stellar winds with a neutron star N2 - INTEGRAL tripled the number of super-giant high-mass X-ray binaries (sgHMXB) known in the Galaxy by revealing absorbed and fast transient (SFXT) systems. Quantitative constraints on the wind clumping of massive stars can be obtained from the study of the hard X-ray variability of SFXT. A large fraction of the hard X-ray emission is emitted in the form of flares with a typical duration of 3 ksec, frequency of 7 days and luminosity of $10^{36}$ erg/s. Such flares are most probably emitted by the interaction of a compact object orbiting at $\sim10~R_*$ with wind clumps ($10^{22 ... 23}$ g) representing a large fraction of the stellar mass-loss rate. The density ratio between the clumps and the inter-clump medium is $10^{2 ... 4}$. The parameters of the clumps and of the inter-clump medium, derived from the SFXT flaring behavior, are in good agreement with macro-clumping scenario and line-driven instability simulations. SFXT are likely to have larger orbital radius than classical sgHMXB. Y1 - 2007 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-18024 ER - TY - CHAP A1 - Iping, R.C. A1 - Sonneborn, G. A1 - Massa, D.L. A1 - Gies, D. A1 - Williams, Simon E. T1 - Far-ultraviolet spectroscopy of O+O binaries in the Magellanic Clouds N2 - We report FUSE observations in 2005–2006 of three O-type, double-lined spectroscopic binaries in the Magellanic Clouds. The systems have very short periods (1.4–2.25 d), represent rare, young evolutionary stages of massive stars and binaries, and provide a unique glimpse at some of the most massive systems that form in dense clusters of massive stars. Improved orbit parameters, including revised masses, for LH54-425 are derived from new ctio spectroscopy. The systems are: LH54-425 in the LMC (O3V + O5V, P=2.25d, 62+37M⊙), J053441-693139 in the LMC (O2-3If+O6V, P=1.4 d, 41+27M⊙), and Hodge 53-47 in the SMC (O6V + O4-5IIIf, P=2.2 d, 24+14M⊙, where the O4 star appears to be less massive than the O6 star). Their short periods indicates that wind interaction and mass transfer are likely important factors in their evolution. The spectra provide quantitative and systematic studies of phase-dependent stellar wind properties, wind collision effects in O+O binaries at lower metallicities, improved radial velocity curves, and FUV spectro-photometric changes as a function of orbital phase. Y1 - 2007 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-17896 ER - TY - GEN A1 - Abdalla, Hassan E. A1 - Adam, Remi A1 - Aharonian, Felix A. A1 - Benkhali, Faical Ait A1 - Angüner, Ekrem Oǧuzhan A1 - Arakawa, Masanori A1 - Arcaro, C A1 - Armand, Catherine A1 - Armstrong, T. A1 - Egberts, Kathrin T1 - Very high energy γ-ray emission from two blazars of unknown redshift and upper limits on their distance T2 - Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe N2 - We report on the detection of very high energy (VHE; E > 100 GeV) gamma-ray emission from the BL Lac objects KUV 00311-1938 and PKS 1440-389 with the High Energy Stereoscopic System (H.E.S.S.). H.E.S.S. observations were accompanied or preceded by multiwavelength observations with Fermi/LAT, XRT and UVOT onboard the Swift satellite, and ATOM. Based on an extrapolation of the Fermi/LAT spectrum towards the VHE gamma-ray regime, we deduce a 95 per cent confidence level upper limit on the unknown redshift of KUV 00311-1938 of z < 0.98 and of PKS 1440-389 of z < 0.53. When combined with previous spectroscopy results, the redshift of KUV 00311-1938 is constrained to 0.51 <= z < 0.98 and of PKS 1440-389 to 0.14 (sic) z < 0.53. T3 - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 1202 KW - BL Lacertae objects: individual KW - galaxies: high-redshift KW - gamma-rays: general KW - Resolved and unresolved sources as a function of wavelength Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-526000 SN - 1866-8372 IS - 4 ER - TY - JOUR A1 - Miranda, Rodrigo A. A1 - Rempel, Erico L. A1 - Chian, Abraham C.-L. A1 - Seehafer, Norbert A1 - Toledo, Benjamin A. T1 - Lagrangian coherent structures at the onset of hyperchaos in the two-dimensional Navier-Stokes equations Y1 - 2013 UR - http://dx.doi.org/10.1063/1.4811297 ER -