TY - JOUR A1 - Stoyanov, Hristiyan A1 - Kollosche, Matthias A1 - Risse, Sebastian A1 - McCarthy, Denis N. A1 - Kofod, Guggi T1 - Elastic block copolymer nanocomposites with controlled interfacial interactions for artificial muscles with direct voltage control JF - Soft matter N2 - Soft, physically crosslinking, block copolymer elastomers were filled with surface-treated nanoparticles, in order to evaluate the possibility for improvement of their properties when used as soft dielectric actuators. The nanoparticles led to improvements in dielectric properties, however they also reinforced the elastomer matrix. Comparing dielectric spectra of composites with untreated and surface-treated particles showed a measurable influence of the surface on the dielectric loss behaviour for high filler amounts, strongly indicating an improved host-guest interaction for the surface-treated particles. Breakdown strength was measured using a test bench and was found to be in good agreement with the results from the actuation measurements. Actuation responses predicted by a model for prestrained actuators agreed well with measurements up to a filler amount of 20%(vol). Strong improvements in actuation behaviour were observed, with an optimum near 15%(vol) nanoparticles, corresponding to a reduction in electrical field of 27% for identical actuation strains. The use of physically crosslinking elastomer ensured the mechanical properties of the matrix elastomer were unchanged by nanoparticles effecting the crosslinking reaction, contrary to similar experiments performed with chemically crosslinking elastomers. This allows for a firm conclusion about the positive effects of surface-treated nanoparticles on actuation behavior. Y1 - 2011 U6 - https://doi.org/10.1039/c0sm00715c SN - 1744-683X SN - 1744-6848 VL - 7 IS - 1 SP - 194 EP - 202 PB - Royal Society of Chemistry CY - Cambridge ER - TY - THES A1 - Stoyanov, Hristiyan T1 - Soft nanocomposites with enhanced electromechanical response for dielectric elastomer actuators T1 - Elastomer-Nanokomposite mit erhöhter elektro-mechanischer Sensitivität für dielektrische Elastomer Aktoren N2 - Electromechanical transducers based on elastomer capacitors are presently considered for many soft actuation applications, due to their large reversible deformation in response to electric field induced electrostatic pressure. The high operating voltage of such devices is currently a large drawback, hindering their use in applications such as biomedical devices and biomimetic robots, however, they could be improved with a careful design of their material properties. The main targets for improving their properties are increasing the relative permittivity of the active material, while maintaining high electric breakdown strength and low stiffness, which would lead to enhanced electrostatic storage ability and hence, reduced operating voltage. Improvement of the functional properties is possible through the use of nanocomposites. These exploit the high surface-to-volume ratio of the nanoscale filler, resulting in large effects on macroscale properties. This thesis explores several strategies for nanomaterials design. The resulting nanocomposites are fully characterized with respect to their electrical and mechanical properties, by use of dielectric spectroscopy, tensile mechanical analysis, and electric breakdown tests. First, nanocomposites consisting of high permittivity rutile TiO2 nanoparticles dispersed in thermoplastic block copolymer SEBS (poly-styrene-coethylene-co-butylene-co-styrene) are shown to exhibit permittivity increases of up to 3.7 times, leading to 5.6 times improvement in electrostatic energy density, but with a trade-off in mechanical properties (an 8-fold increase in stiffness). The variation in both electrical and mechanical properties still allows for electromechanical improvement, such that a 27 % reduction of the electric field is found compared to the pure elastomer. Second, it is shown that the use of nanofiller conductive particles (carbon black (CB)) can lead to a strong increase of relative permittivity through percolation, however, with detrimental side effects. These are due to localized enhancement of the electric field within the composite, which leads to sharp reductions in electric field strength. Hence, the increase in permittivity does not make up for the reduction in breakdown strength in relation to stored electrical energy, which may prohibit their practical use. Third, a completely new approach for increasing the relative permittivity and electrostatic energy density of a polymer based on 'molecular composites' is presented, relying on chemically grafting soft π-conjugated macromolecules to a flexible elastomer backbone. Polarization caused by charge displacement along the conjugated backbone is found to induce a large and controlled permittivity enhancement (470 % over the elastomer matrix), while chemical bonding, encapsulates the PANI chains manifesting in hardly any reduction in electric breakdown strength, and hence resulting in a large increase in stored electrostatic energy. This is shown to lead to an improvement in the sensitivity of the measured electromechanical response (83 % reduction of the driving electric field) as well as in the maximum actuation strain (250 %). These results represent a large step forward in the understanding of the strategies which can be employed to obtain high permittivity polymer materials with practical use for electro-elastomer actuation. N2 - Die Palette von elektro-mechanischen Aktuatoren, basierend auf dem Prinzip weicher dehnbarer Kondensatoren, scheint besonders für Anwendungen in der Medizin und für biomimetische Applikationen unbegrenzt. Diese Wandler zeichnen sich sowohl durch hohe Reversibilität bei großer mechanischer Deformation als auch durch ihre Flexibilität aus, wobei die mechanischen Deformationen durch elektrische Felder induziert werden. Die Notwendigkeit von hoher elektrischer Spannung zur Erzeugung dieser mechanischen Deformationen verzögert jedoch die technisch einfache und breite Markteinführung dieser Technologie. Diesem Problem kann durch eine gezielte Materialmodifikation begegnet werden. Eine Modifikation hat das Ziel, die relative Permittivität zu erhöhen, wobei die Flexibilität und die hohe elektrische Durchbruchsfeldstärke beibehalten werden sollten. Durch eine Materialmodifikation kann die Energiedichte des Materials bedeutend erhöht und somit die notwendige Betriebsspannung des Aktuators herabgesetzt werden. Eine Verbesserung der funktionalen Materialeigenschaften kann durch die Verwendung von Nanokompositen erzielt werden, welche die fundamentalen Eigenschaften der Nanopartikel, d.h. ein gutes Verhältnis von Oberfläche zu Volumen nutzen, um eine gezielte makroskopische Materialmodifikation zu bewirken. Diese Arbeit behandelt die Anwendung innovativer Strategien für die Erzeugung von Nanomaterialien mit hoher Permittivität. Die so erzeugten Materialien und deren relevante Aktuatorkenngrößen werden durch elektrische und mechanische Experimente vollständig erfasst. Mittels der klassischen Mischansätze zur Erzeugung von Kompositmaterialen mit hoher Permittivität konnte durch nichtleitendes Titaniumdioxid TiO2 (Rutile) in einem Thermoplastischen-Block-Co-Polymer SEBS (poly-styrene-co-ethylene-cobutylene-co-styrene) die Permittivität bereits um 370 % erhöht und die elektrische Energiedichte um 570 % gesteigert werden. Diese Veränderungen führten jedoch zu einem signifikanten Anstieg der Steifigkeit des Materials. Aufgrund der positiven Rückkopplung von elektrischen und mechanischen Eigenschaften des Kompositmaterials ermöglicht bereits dieser einfache Ansatz eine Verbesserung der Aktuation, bei einer 27 %-igen Reduktion der Aktuatorbetriebsspannung. Eine direkte Verwendung von leitfähigen Nanopartikeln kann ebenso zu einem Anstieg der relativen Permittivität beitragen, wobei jedoch die Leitfähigkeit dieser Nanopartikel bedeutende Wechselwirkungen verursacht, welche somit die Energiedichte des Materials negativ beeinflusst und die praktische Verwendung dieses Kompositsystems ausschließt. Als ein völlig neuer Ansatz zur Steigerung der relativen Permittivität und Energiedichte und abweichend vom klassischen Mischverfahren, wird die Herstellung eines "Molekularen Komposits", basierend auf einem chemischen Propfverfahren, präsentiert. In diesem Ansatz wird ein π-konjugiertes leitfähiges Polymer (PANI) an die Hauptkette des Elastomers der Polymermatrix gebunden. Die daraus resultierende Ladungsverteilung entlang der Elastomerhauptkette bewirkt eine 470 %-ige Steigerung der Permittivität des "Molekularen Komposits" im Vergleich zur Permittivität des unbehandelten Elastomermaterials. Aufgrund der Verkapselung der chemischen Bindungen der PANI-Kette entstehen kaum negative Rückwirkungen auf die elektrischen und mechanischen Eigenschaften des so erzeugten Komposits. Diese Materialeigenschaften resultieren in einem signifikanten Anstieg der Energiedichte des Materials. Das mittels dieses Verfahrens erzeugte Komposit zeigt sowohl eine Steigerung der Sensitivität der elektromechanischen Antwort (Reduktion des elektrischen Felds um 83 %) als auch eine bedeutende Steigerung der maximalen Aktuation (250 %). Die Ergebnisse und Ideen dieser Arbeit stellen einen wesentlichen Sprung im Verständnis zur Permittivitätssteigerung in Polymermaterialien dar und werden deshalb in der Erforschung und Entwicklung von Elastomeraktuatoren Beachtung finden. KW - dielektrische Elastomere KW - Nanokomposite KW - hohe Permittivität KW - elektrostatische Energiedichte KW - elektromechanische Reaktion KW - dielectric elastomers KW - nanocomposites KW - high permittivity KW - electrostatic energy density KW - electromechanical response Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-51194 ER - TY - JOUR A1 - Stoof-Leichsenring, Kathleen Rosemarie A1 - Junginger, Annett A1 - Olaka, Lydia A. A1 - Tiedemann, Ralph A1 - Trauth, Martin H. T1 - Environmental variability in Lake Naivasha, Kenya, over the last two centuries JF - Journal of paleolimnolog N2 - Lake Naivasha, Kenya, is one of a number of freshwater lakes in the East African Rift System. Since the beginning of the twentieth century, it has experienced greater anthropogenic influence as a result of increasingly intensive farming of coffee, tea, flowers, and other horticultural crops within its catchment. The water-level history of Lake Naivasha over the past 200 years was derived from a combination of instrumental records and sediment data. In this study, we analysed diatoms in a lake sediment core to infer past lacustrine conductivity and total phosphorus concentrations. We also measured total nitrogen and carbon concentrations in the sediments. Core chronology was established by (210)Pb dating and covered a similar to 186-year history of natural (climatic) and human-induced environmental changes. Three stratigraphic zones in the core were identified using diatom assemblages. There was a change from littoral/epiphytic diatoms such as Gomphonema gracile and Cymbella muelleri, which occurred during a prolonged dry period from ca. 1820 to 1896 AD, through a transition period, to the present planktonic Aulacoseira sp. that favors nutrient-rich waters. This marked change in the diatom assemblage was caused by climate change, and later a strong anthropogenic overprint on the lake system. Increases in sediment accumulation rates since 1928, from 0.01 to 0.08 g cm(-2) year(-1) correlate with an increase in diatom-inferred total phosphorus concentrations since the beginning of the twentieth century. The increase in phosphorus accumulation suggests increasing eutrophication of freshwater Lake Naivasha. This study identified two major periods in the lake's history: (1) the period from 1820 to 1950 AD, during which the lake was affected mainly by natural climate variations, and (2) the period since 1950, during which the effects of anthropogenic activity overprinted those of natural climate variation. KW - Lake sediments KW - Diatoms KW - Conductivity KW - Lake Naivasha KW - Human impact KW - Eutrophication Y1 - 2011 U6 - https://doi.org/10.1007/s10933-011-9502-4 SN - 0921-2728 VL - 45 IS - 3 SP - 353 EP - 367 PB - Springer CY - Dordrecht ER - TY - THES A1 - Stoof-Leichsenring, Kathleen Rosemarie T1 - Genetic analysis of diatoms and rotifers in tropical Kenyan lake sediments Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Stojanovic, Milovan A1 - Markovic, Rade A1 - Kleinpeter, Erich A1 - Baranac-Stojanovic, Marija T1 - Endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines JF - Tetrahedron N2 - endo-Mode cyclizations of vinylogous N-acyliminium ions incorporating heteroatom-based nucleophiles have been examined as a route to the synthesis of condensed thiazolidines. The scope of these reactions and stereochemical outcome are discussed and explained using quantum chemical calculations. KW - Vinylogous N-acyliminium ion KW - endo-Mode cyclization KW - Condensed thiazolidines KW - Quantum chemical calculations Y1 - 2011 U6 - https://doi.org/10.1016/j.tet.2011.10.011 SN - 0040-4020 VL - 67 IS - 49 SP - 9541 EP - 9554 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Stojanovic, Milovan A1 - Markovic, Rade A1 - Kleinpeter, Erich A1 - Baranac-Stojanovic, Marija T1 - endo-Mode cyclizations of vinylogous N-acyliminium ions as a route to the synthesis of condensed thiazolidines Y1 - 2011 SN - 0040-4020 ER - TY - JOUR A1 - Stockhorst, Stefanie A1 - Evert, Felix T1 - Preussische Gastlichkeit : Friedrich Nicolai und die Wirtshauskultur des 18. Jahrhunderts Y1 - 2011 SN - 978-3-89693-553-3 ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Signals from the past forms and functions of the traditional behavior in Thomas Kling's essay JF - Zeitschrift für Germanistik Y1 - 2011 U6 - https://doi.org/10.3726/92132_114 SN - 0323-7982 VL - 21 IS - 1 SP - 114 EP - 130 PB - Lang CY - Bern ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Reed, T. J., Mehr Licht in Deutschland. Eine kleine Geschichte der Aufklärung; München, Beck, 2009 BT - Mehr Licht in Deutschland. Eine kleine Geschichte der Aufklärung Y1 - 2011 SN - 0722-740X ER - TY - THES A1 - Stockhorst, Stefanie T1 - Einführung in das Werk Gotthold Ephraim Lessings T2 - Einführungen Germanistik Y1 - 2011 SN - 978-3-534-22984-0 PB - WBG CY - Darmstadt ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Friedrich Nicolai (1733 - 1811) : zum 200. Todestag des Berliner Aufklärers Y1 - 2011 ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Le raccolte di saggi "Itinerar" (1997) e "Botenstoffe" (2001) di Thomas Kling archeologo del linguaggio Y1 - 2011 SN - 978-88-15-14700-4 ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Weimarer Klassik Y1 - 2011 SN - 978-3- 476-02004-8 ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Ethische Aufrüstung : zur Konvergenz von Landlebensdichtung und Neustoizismus im Zeichen des Dreissigjährigen Krieges am Beispiel von J. G. Schottelius' Lamentatio Germaniae exspirantis (1640) Y1 - 2011 ER - TY - JOUR A1 - Stockhorst, Stefanie T1 - Signale aus der Vergangenheit : zu Formen und Funktionen des Traditionsverhaltens in Thomas Klings Essayistik Y1 - 2011 ER - TY - GEN A1 - Stockhorst, Stefanie T1 - Friedrich Nicolai (1733-1811). - on the two hundreth Anniversary of the Berlin Enlightenment writer and bookseller has works published T2 - Zeitschrift für Germanistik Y1 - 2011 SN - 0323-7982 VL - 21 IS - 1 SP - 153 EP - 159 PB - Lang CY - Bern ER - TY - JOUR A1 - Stillmark, Katja T1 - Affekt der Straße in zeitgenössischen autobiographischen Texten und dystopischen Romanen Y1 - 2011 SN - 978-3-8376-1404-6 ER - TY - JOUR A1 - Stillmark, Hans-Christian T1 - Das Geschichtsdrama : ein Erbstück der DDR-Literatur N2 - Der Aufsatz beschäftigt sich mit dem Genre des Geschichtsdramas und verweist auf das Problem des Dramas wie auf das der Geschichte im Verlaufe der DDR-Entwicklung und danach. Untersucht werden die Abweichung und Aufloesungserscheinungen des aristotelischen Dramas unter den Bedingung einer geschwundenen Geschichtsutopie. Y1 - 2011 ER - TY - JOUR A1 - Stillmark, Hans-Christian T1 - Transformationsräume im Werk Wolfgang Hilbigs N2 - Der Beitrag untersucht bestimmte Raeume, die in Wolfgang Hilbigs Prosawerk wiederholt auftauchen und die mit einer bestimmten affektiven Ladung ausgestattet sind. Es sind dies die Kuechen, die in Hilbigs Werk einer Geschlechtsverwandlung von einem ehemals weiblichen in einen maennlichen Arbeitsraum unterzogen werden. Auch werden idyllische Waldsiedlungen in Hilbigs Geschichten zu Staetten, die vom Judenmord durchzogen werden. Generall kann verallgemeinert werden, dass Hilbigs Raeume Transformationen unterliegen, die Verwandlungen bewirken. Y1 - 2011 SN - 978-3-8376-1404-6 ER - TY - JOUR A1 - Stillmark, Hans-Christian T1 - Zu Kleists theatralischer Transformation der Körper N2 - Der Beitrag untersucht Kleists Dramentexte vor allem im Hinblick auf den "Skandal" des Koerpers und versucht dafuer eine Erklaerung zu finden. Diese besteht zunaechst im Herausfall aus dem Paradigma des aesthetischem Koerpers als einem schoenen Koerper. Zum zweiten aber auch darin, das Kleist mit seinen literarischen Mitteln eine drastische Performation des Koerpers fuer das Buehnenstueck vornahm ohne dafuer eine theatralische Praxis zu haben. Der Einsatz des Koerpers als ein Zeichen im Buehnenspiel ist daher strategisch vom Autor Kleist zu einer Aussage performiert worden, die neben den Aussagen des sprachlichen Textes eine weitere koerpersprachliche Textur konstruiert. Y1 - 2011 SN - 978- 3-939888-93-2 ER - TY - JOUR A1 - Sticher, Heike A1 - Czepluch, Christine A1 - Mätzener, Flurina A1 - Wilmes, Stefanie A1 - Hadert, Sandra A1 - Frank, Ulrike A1 - Mäder, Mark T1 - Dekanülierungsmanagement bei Patienten mit respiratorischen Beeinträchtigungen und Dysphagie JF - Spektrum Patholinguistik Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-54277 SN - 1869-3822 SN - 1866-9433 IS - 4 SP - 141 EP - 142 ER - TY - JOUR A1 - Sticher, Heike A1 - Czepluch, Christine A1 - Mätzener, Flurina A1 - Wilmes, Stefanie A1 - Hadert, Sandra A1 - Frank, Ulrike A1 - Mäder, Mark T1 - Dekanülierungsmanagment bei Patienten mit respiratorischen Beeinträchtigungen und Dysphagie Y1 - 2011 ER - TY - JOUR A1 - Stich, Michael A1 - Beta, Carsten T1 - Standing waves in a complex Ginzburg-Landau equation with time-delay feedback JF - Discrete and continuous dynamical systems : a journal bridging mathematics and sciences N2 - Standing waves are studied as solutions of a complex Ginsburg-Landau equation subjected to local and global time-delay feedback terms. The onset of standing waves is studied at the instability of the homogeneous periodic solution with respect to spatially periodic perturbations. The solution of this spatiotemporal wave pattern is given and is compared to the homogeneous periodic solution. KW - pattern formation KW - reaction-diffusion system KW - control Y1 - 2011 SN - 1078-0947 SN - 1553-5231 IS - 1 SP - 1329 EP - 1334 PB - American Institute of Mathematical Sciences CY - Springfield ER - TY - JOUR A1 - Sternagel, Jörg T1 - Levinas and the cinema of redemption time, ethics, and the feminine JF - Film criticism Y1 - 2011 SN - 0163-5069 VL - 36 IS - 1 SP - 97 EP - 99 PB - Michigan Publishing CY - Meadville ER - TY - JOUR A1 - Steinicke, Lars A1 - Schlaak, Claudia T1 - Die Präsenz französisch-basierter Kreolsprachen im Internet JF - Mobilisierte Kulturen Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53692 SN - 2192-3019 SN - 2192-3027 IS - 2 SP - 151 EP - 172 ER - TY - JOUR A1 - Steinicke, Lars A1 - Schlaak, Claudia T1 - Die Präsenz französisch-basierter Kreolsprachen im Internet Y1 - 2011 SN - 978-3-86956-091-5 ER - TY - JOUR A1 - Steinhoefel, Grit A1 - Breuer, Jörn A1 - von Blanckenburg, Friedhelm A1 - Horn, Ingo A1 - Kaczorek, Danuta A1 - Sommer, Michael T1 - Micrometer silicon isotope diagnostics of soils by UV femtosecond laser ablation JF - Chemical geology : official journal of the European Association for Geochemistry N2 - This study presents the first Si isotope data of the principle Si pools in soils determined by a UV femtosecond laser ablation system coupled to a multicollector inductively coupled plasma mass spectrometer (MC-ICP-MS). This method reveals accurate and precise Si isotope data on bulk materials, and at high spatial resolution, on the mineral scale. The following Si pools have been investigated: a) the Si source to soils on all major silicate minerals on thin sections from bedrock fragments in the soil profiles; b) bulk soils (particle size <2 mm) after fusion to glass beads with an iridium-strip heater or pressed into powder pellets: c) separated clay fractions as pressed powder pellets and e) separated phytoliths as pressed powder pellets. Multiple analyses of three rock standards, BHVO-2, AGV-1 and RGM-1 as fused glass beads and as pressed powder pellets, reveal delta(30)Si values within the expected range of igneous rocks. The MPI-DING reference glass KL2-G exhibits the same Si isotope composition after remelting by an iridium-strip heater showing that this technique does not alter the isotope composition of the glass. We used this approach to investigated two immature Cambisols developed on sandstone and paragneiss in the Black Forest (Germany), respectively. Bulk soils show a largely uniform Si isotope signature for different horizons and locations, which is close to those of primary quartz and feldspar with delta(30)Si values around -0.4 parts per thousand. Soil clay formation is associated with limited Si mobility, which preserves initial Si isotope signatures of parental minerals. An exception is the organic horizon of the paragneiss catchment where intense weathering leads to a high mobility of Si and significant negative isotope signatures as low as to -1.00 parts per thousand in bulk soils. Biogenic opal in the form of phytoliths, exhibits negative Si isotope signatures of about -0.4 parts per thousand. These results demonstrate that UV femtosecond laser ablation MC-ICP-MS provides a tool to characterize the Si isotope signature of the principle Si pools left behind after weathering and Si transport have altered soils. These results can now serve as a fingerprint of the residual solids that can be used to explain the isotope composition of dissolved Si in soil solutions and river water, which is mostly enriched in the heavy isotopes. KW - Silicon isotopes KW - Soils KW - UV femtosecond laser ablation KW - MC-ICP-MS Y1 - 2011 U6 - https://doi.org/10.1016/j.chemgeo.2011.05.013 SN - 0009-2541 VL - 286 IS - 3-4 SP - 280 EP - 289 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Stehl, Thomas T1 - Sprachen und Diskurse als Träger und Mittler mobiler Kulturen BT - Kommunikative Aspekte der Migrationslinguistik JF - Mobilisierte Kulturen Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53646 SN - 2192-3019 SN - 2192-3027 IS - 2 SP - 39 EP - 55 ER - TY - JOUR A1 - Stehl, Thomas T1 - Mobilität, Sprachkontakte und Integration BT - Aspekte der Migrationslinguistik JF - Mobilisierte Kulturen Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57321 SN - 2192-3019 SN - 2192-3027 IS - 1 SP - 33 EP - 52 ER - TY - JOUR A1 - Stehl, Thomas T1 - Sprachen und Diskurse als Träger und Mittler mobiler Kulturen ; kommunikative Aspekte der Migrationslinguistik Y1 - 2011 SN - 978-3-86956-091-5 ER - TY - BOOK A1 - Stehl, Thomas ED - Schlaak, Claudia ED - Busse, Lena T1 - Sprachkontakte, Sprachvariation und Sprachwandel : Festschrift für Thomas Stehl zum 60. Geburtstag Y1 - 2011 SN - 978-3-8233-6601-0 PB - Narr Francke Attempto Verlag GmbH Co. KG CY - Tübingen ER - TY - JOUR A1 - Stehl, Thomas T1 - Romanische Sprachkontakte und Sprachdynamiken in einer funktionalen Variationslinguistik Y1 - 2011 SN - 978-3-8382-0097-2 ER - TY - JOUR A1 - Stehl, Thomas T1 - Mobilität, Sprachkontakte und Integration : Aspekte der Migrationslinguistik Y1 - 2011 SN - 978-3-86956-090-8 ER - TY - JOUR A1 - Stehl, Thomas T1 - Vorwort JF - Mobilisierte Kulturen Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53626 SN - 2192-3019 SN - 2192-3027 IS - 2 SP - 7 EP - 13 ER - TY - JOUR A1 - Stecker, Christian T1 - Linking citizens and parties how electoral systems matter for political representation JF - West European politics Y1 - 2011 U6 - https://doi.org/10.1080/01402382.2011.616673 SN - 0140-2382 VL - 34 IS - 6 SP - 1316 EP - 1317 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Stecker, Christian T1 - Determinants of party unity a comparative analysis of the german state parliaments JF - Politische Vierteljahresschrift : Zeitschrift der Deutschen Vereinigung für Politische Wissenschaft N2 - Using 2184 roll call votes (RCV) from 42 electoral terms this paper tests the influence of different factors on party unity in the German Landtage. It finds evidence that the strategic calculus behind RCV-requests is a crucial predictor for unity scores. The requesting party group is on average significantly more united than its parliamentary competitors. It also shows that government status, thin governmental majorities and a growing ideological distance between government and opposition increase unity. Electoral incentives, however, do not seem to influence voting behavior in the German Lander. KW - Party Unity KW - Party Discipline KW - Roll Call Votes Y1 - 2011 SN - 0032-3470 SN - 1862-2860 VL - 52 IS - 3 SP - 424 EP - 447 PB - Nomos CY - Hannover ER - TY - JOUR A1 - Stankiewicz, Jacek A1 - Munoz, G. A1 - Ritter, Oliver A1 - Bedrosian, Paul A. A1 - Ryberg, Trond A1 - Weckmann, Ute A1 - Weber, Michael H. T1 - Shallow lithological structure across the Dead Sea Transform derived from geophysical experiments JF - Geochemistry, geophysics, geosystems N2 - In the framework of the DEad SEa Rift Transect (DESERT) project a 150 km magnetotelluric profile consisting of 154 sites was carried out across the Dead Sea Transform. The resistivity model presented shows conductive structures in the western section of the study area terminating abruptly at the Arava Fault. For a more detailed analysis we performed a joint interpretation of the resistivity model with a P wave velocity model from a partially coincident seismic experiment. The technique used is a statistical correlation of resistivity and velocity values in parameter space. Regions of high probability of a coexisting pair of values for the two parameters are mapped back into the spatial domain, illustrating the geographical location of lithological classes. In this study, four regions of enhanced probability have been identified, and are remapped as four lithological classes. This technique confirms the Arava Fault marks the boundary of a highly conductive lithological class down to a depth of similar to 3 km. That the fault acts as an impermeable barrier to fluid flow is unusual for large fault zone, which often exhibit a fault zone characterized by high conductivity and low seismic velocity. At greater depths it is possible to resolve the Precambrian basement into two classes characterized by vastly different resistivity values but similar seismic velocities. The boundary between these classes is approximately coincident with the Al Quweira Fault, with higher resistivities observed east of the fault. This is interpreted as evidence for the original deformation along the DST originally taking place at the Al Quweira Fault, before being shifted to the Arava Fault. KW - magnetotellurics KW - seismic tomography Y1 - 2011 U6 - https://doi.org/10.1029/2011GC003678 SN - 1525-2027 VL - 12 IS - 3-4 PB - American Geophysical Union CY - Washington ER - TY - JOUR A1 - Stanke, Sandra A1 - Bier, Frank Fabian A1 - Hoezel, Ralph T1 - Fluid streaming above interdigitated electrodes in dielectrophoresis experiments JF - Electrophoresis : microfluidics, nanoanalysis & proteomics N2 - For the investigation of alternating current electrokinetic effects, a system is presented that allows for the simultaneous observation of fluid flow above and around microelectrodes in all three directions in space. Beside the usual microscopical view from top, lateral observation through the same objective is made possible by two small mirrors that are placed next to the electrodes. Fluid flow and movement of fluorescent nanoparticles above interdigitated electrodes are monitored by fluorescence microscopy and digital imaging and are further analysed by image processing. Field frequencies are varied from 10 Hz to 1 GHz at up to 10V(rms). Electrical conductivity of the fluid is monitored in situ in the actual measuring chamber. KW - Dielectrophoresis KW - Fluid streaming KW - Nanobead Y1 - 2011 U6 - https://doi.org/10.1002/elps.201100096 SN - 0173-0835 VL - 32 IS - 18 SP - 2448 EP - 2455 PB - Wiley-Blackwell CY - Malden ER - TY - JOUR A1 - Stahlberg, Tim A1 - Lahmann, Henning T1 - A Paradigm of Prevention Humpty Dumpty, the War on Terror, and the Power of Preventive Detention in the United States, Israel, and Europe JF - The American journal of comparative law N2 - A decade into the proclaimed "global war on terror," states are still struggling with the phenomenon's locus and definition under the effective laws. Remarkably, preventive detention of suspected terrorists fluctuates between various legal regimes: In Europe, criminal law is predominantly used but special security orders are occasionally issued as well; Israel applies in part the law of international armed conflicts; and in the United States, detention under a new war premise has been claimed. This Article analyzes the response of the U.S. Supreme Court, the Israeli Supreme Court, and the European Court of Human Rights to legislative and executive policies asserting the power of preventive detention in the aftermath of September 11, 2001. The comparison exposes significant differences with regard to the application of international law, and most prominently concerning the underlying question of whether the struggle against terrorism should be considered a "war," or, perhaps more traditionally, a fight against crime. Despite the substantial discrepancies in these three jurisdictions, this Article argues that the similarities are actually more striking. Whereas no court has accepted any attempt to fight terrorism outside the bounds of law, the judges have not hesitated to stretch and blur the pertinent frameworks by extensive interpretation. Ultimately, it is questionable whether on account of the individual's rights the resulting flexibilities and uncertainties are justifiable. "I don't know what you mean by 'glory'," Alice said. Humpty Dumpty smiled contemptuously. "Of course you don't till I tell you. I meant 'there's a nice knock-down argument for you!" "But 'glory' doesn't mean 'a nice knock-down argument" Alice objected. "When I use a word," Humpty Dumptysaid, in rather a scornful tone, "it means just what I choose it to mean - neither more nor less." "The question is," said Alice, "whether you can make words mean different things." "The question is," said Humpty Dumpty, "which is to be master that's all." Y1 - 2011 U6 - https://doi.org/10.5131/AJCL.2010.0034 SN - 0002-919X VL - 59 IS - 4 SP - 1051 EP - 1087 PB - American Society of Comparative Law CY - Berkeley ER - TY - THES A1 - Stahl, Silvester T1 - Selbstorganisation von Migranten im deutschen Vereinssport : eine soziologische Annäherung T1 - Migrant self-organization in the German club sport system : a sociological approach N2 - Diese von der Wirtschafts- und Sozialwissenschaftlichen Fakultät der Universität Potsdam angenommene Dissertation thematisiert die Selbstorganisation von Migranten in eigenen Sportvereinen und auf anderen Ebenen des Vereinssports. Sie beruht auf den Ergebnissen eines vom Bundesinstitut für Sportwissenschaft geförderten Forschungsprojekts der Universität Potsdam. Mit mehreren hundert Migrantensportvereinen in ganz Deutschland stellt der Sport einen der wichtigsten Gesellschaftsbereiche für die Selbstorganisation von Zuwanderern dar. Doch obwohl sich Migranten in der Bundesrepublik schon seit den 1960er Jahren in eigenen Sportvereinen zusammenschließen, ist das Thema zuvor noch nicht umfassend untersucht worden. Um diese Forschungslücke zu schließen, stellt die Arbeit Basisinformationen über verschiedene Organisationsformen, typische Entstehungszusammenhänge, spezifische Problemfelder sowie wiederkehrende Konfliktmuster bereit und präsentiert darauf aufbauende Annahmen über die Wirkungen der sportbezogenen Selbstorganisation auf das Verhältnis von Einheimischen und Zuwanderern im Sport, auf die allgemeinen interethnischen Beziehungen und auf den gesamtgesellschaftlichen Integrationsprozess. Daran anknüpfend werden mögliche Konsequenzen aufgezeigt, die die verschiedenen Akteure des Sportsystems aus den dargestellten Forschungsbefunden ziehen können. Die Arbeit basiert auf den Befunden einer in den Jahren 2006 bis 2009 durchgeführten empirischen Untersuchung, in der verschiedene qualitative Methoden eingesetzt wurden, um das Forschungsfeld explorativ, ergebnisoffen und in einer möglichst weiten Perspektive zu beleuchten. In erster Linie bestand diese Feldstudie in einer Interviewreihe, für die 25 Vertreter von Migrantensportvereinen sowie 15 Feldexperten aus verschiedenen Berufsgruppen und Organisationen in Leitfaden-Interviews befragt wurden. Ergänzt wurde die Interviewstudie durch eine Zeitungsanalyse, für die sieben Tages- und Wochenzeitungen nach Artikeln zum Thema durchsucht wurden, sowie gezielte Feldbeobachtungen, etwa beim Besuch von Fußballspielen, bei Versammlungen und Festen sowie in Vereinsheimen. Darüber hinaus wurde eine umfangreiche Internetrecherche durchgeführt, bei der vor allem die Webseiten von über 65 Migrantensportvereinen in Augenschein genommen wurden. In allen Untersuchungsteilen war das Vorgehen des Verfassers stark an der Grounded-Theory-Methode orientiert. Die so gewonnenen Forschungsergebnisse deuten darauf hin, dass eigenständige Migrantensportvereine, die als vorherrschende Form der sportbezogenen Selbstorganisation von Zuwanderern im Mittelpunkt der Arbeit stehen, aus komplexen gesellschaftlichen Inklusions-, Schließungs- sowie Segmentationsprozessen resultieren und interindividuell unterschiedliche Beteiligungsmotive ihrer Mitglieder aufnehmen. Sie stellen typischerweise multifunktionale Hybridorganisationen dar und erbringen für die beteiligten Migranten und deren lokale Gemeinschaften spezifische Integrations-, Repräsentations- und Solidarleistungen, durch die sie sich signifikant von deutschen Sportvereinen und Migrantenorganisationen in anderen Sektoren abheben. Zugleich unterscheiden sich die Migrantensportvereine untereinander hinsichtlich Vereinstätigkeit, Selbstverständnis und Konfliktbeteiligung sehr stark. Ihre Rückwirkung auf den Vereinssport als organisationales Feld, auf die interethnischen Beziehungen in anderen Gesellschaftsbereichen und auf den gesamtgesellschaftlichen Integrationsprozess ist den präsentierten Forschungsergebnissen zufolge gleichfalls sehr ambivalent. Einerseits erbringen Migrantenvereine nicht nur die gleichen gemeinnützigen Leistungen im Bereich der sozialen Integration wie andere Sportvereine auch, sondern entfalten darüber hinaus, indem sie die Integrationsfähigkeit ihrer Mitglieder erhöhen und Personen in den organisierten Sport einbeziehen, die sonst gar keinem Sportverein beitreten würden, spezifische Integrationswirkungen, die andere Sportvereine nicht aufweisen. Andererseits erhöht die Selbstorganisation von Migranten in eigenen Sportvereinen soziale Distanzen und Spannungen zwischen Einheimischen und Zuwanderern, zumal Migrantensportvereine vor allem an den manchmal gewaltvollen Konflikten im Amateurfußball überproportional häufig beteiligt sind. Darüber hinaus stellt ein relativ kleiner Teil der Migrantensportvereine wegen Organisationsdefiziten eine ernste Belastung für die Tätigkeit der Sportverbände dar. Pauschalisierende Negativbewertungen der Vereine werden vom Verfasser jedoch als ungerechtfertigt und nicht sachangemessen zurückgewiesen. N2 - This Ph.D. dissertation submitted to the Department of Economics and Social Sciences at the Universität Potsdam focuses on the self-organization of migrants in sport clubs and on other various levels of the club sport system. It is based on the findings of a research project by the Universität Potsdam, which was funded by the German Federal Institute for Sport Science (Bundesinstitut für Sportwissenschaft). Sport represents a major societal area for the self-organization of migrants, with several hundred migrant sport clubs established throughout Germany. However, the topic has not yet been scientifically investigated, although migrants in the Federal Republic have been members of autonomous sport clubs since the 1960s. In order to fill this research gap, this dissertation provides basic information about different forms of organization, typical founding circumstances, specific problems and frequent conflict patterns, and presents assumptions on the effects sport related self-organization has on interethnic relations in sport and society and the general integration process. An outline of the potential consequences which different actors within the sport system could draw from these findings then follows. The text is based on the results of an empirical study conducted from 2006 to 2009, in which a variety of qualitative methods has been employed in order to explore the field of investigation as openly and widely as possible. This field study consisted primarily of a set of interviews, in which 25 executives of migrant sport clubs and 15 experts from different professions and organizations were surveyed in questionnaire guided interviews. In addition, a newspaper analysis was implemented; seven daily and weekly papers were searched for articles pertaining to the topic, and systematic field observations were conducted at soccer matches, meetings and parties, as well as in club houses. In addition, extensive internet research was undertaken by examining the home pages of more than 65 migrant sport clubs. The investigation was strongly oriented on the grounded theory method. The findings of these investigations indicate that autonomous migrant sport clubs, which are the main focus of the book as the dominant form of sport related migrant self-organization, result from complex social processes of inclusion, exclusion and segmentation and take on diverse individual motives for participation. They typically serve as multifunctional hybrid organizations, which fulfill different functions of integration, representation and solidarity for the migrants involved and their local communities, thereby significantly differing from German sport clubs and other migrant organizations respectively. At the same time, migrant sport clubs vary strongly in terms of club activity, self-concept and conflict involvement. Their influence on the club sport system as their organizational field, on interethnic relations in other sectors of society, and on the general integration process is also very ambivalent according to the presented findings. Migrant sport clubs not only accomplish the same merits of social integration as other sport clubs but also promote integration in specific ways by improving their members’ ability for integration and involving persons in organized sport that otherwise would not join a sport club. However, the self-organization of migrants in sport clubs also increases social distances and tensions between migrants and natives, especially since migrant sports clubs are often involved in the sometimes violent conflicts of amateur soccer. In addition, a relatively small number of migrant sport clubs severely affects the activities of sport associations because of deficits in organization. Generalized criticism towards these clubs is nevertheless rejected by the author as unjust and inadequate. KW - Sportsoziologie KW - Sport KW - Sportverein KW - Migration KW - Ethnizität KW - sport sociology KW - sport KW - sport club KW - migration KW - ethnicity Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53788 SN - 978-3-86956-151-6 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Stadler, Heike T1 - Mehr Chancen als Risiken BT - Öffentliche Bibliotheken im Bürgerhaushalt : Positive Beispiele in Berlin JF - BuB : Forum für Bibliothek und Information 63 (2011) 3 N2 - Anne Christensen spricht von partizipativer Entwicklung, wenn sie sich zum Komplex Bibliothek 2.0 äußert, und meint damit primär die stärkere Einbeziehung der Benutzer, wenn es um die Zukunft der kollaborativen Erschließung von Medien in Bibliothekskatalogen geht.1 Diese Art der Partizipation tangiert Kernaufgaben sowohl an Öffentlichen als auch an wissenschaftlichen Bibliotheken. Über die Beteiligung der Benutzer am Katalog 2.0 hinaus könnte auch durch eine weitere Form der Partizipation Einfl uss auf die Zukunft Öffentlicher Bibliotheken genommen werden: durch den Bürgerhaushalt. Y1 - 2011 UR - www.b-u-b.de/pdfarchiv/Heft-BuB_03_2011.pdf VL - 63 IS - 3 SP - 196 EP - 199 PB - Bock + Herchen CY - Bad Honnef ER - TY - JOUR A1 - Stadler, Heike T1 - Der Bürger entscheidet mit BT - die Bibliothek als Diskussionsgegenstand zwischen Politik, Kommunalverwaltung und Bürgerschaft JF - BuB : Forum für Bibliothek und Information 63 (2011) 6 N2 - »Warum erregt der geplante Abriss eines Bahnhofs die Nation, während gegen das hundertfache Sterben von Bibliotheken immer nur ein paar Stimmen laut werden? Wo sind die Wutbürger, wenn man sie braucht?«, überlegte sich hierzulande Tilman Spreckelsen.1 Die Kernfrage lautet also: Stehen die Bürger eigentlich hinter der Bibliothek? Ob und wie die Bürgerschaft für ihre Öffentliche Bibliothek entscheidet, wenn sie entscheiden darf, wird im vorliegenden Aufsatz thematisiert. Ergebnisse von Bürgerbegehren und Bürgerentscheiden stehen dabei im Fokus, da bürgerschaftliches Engagement bei diesen Mitwirkungsinstrumenten besonders gefragt ist und es gleichzeitig kommunalpolitische Folgen haben kann. Am Beispiel von Stuttgart 21 wird darüber hinaus der Fragestellung nachgegangen, wie sich eine Öffentliche Bibliothek zu Sachverhalten positioniert, die (nicht nur) kommunalpolitisch brisant sind. Y1 - 2011 UR - www.b-u-b.de/pdfarchiv/Register-BuB_2011.pdf VL - 63 IS - 6 SP - 450 EP - 453 PB - Bock + Herchen CY - Bad Honnef ER - TY - JOUR A1 - Stadler, Heike T1 - Porto Alegre und Christchurch als Vorbild BT - Der Bürgerhaushalt wird weltweit angewendet : Dynamische Entwicklung in Europa JF - BuB : Forum für Bibliothek und Information 63 (2011) 3 Y1 - 2011 UR - www.b-u-b.de/pdfarchiv/Heft-BuB_03_2011.pdf VL - 63 IS - 3 SP - 197 PB - Bock + Herchen CY - Bad Honnef ER - TY - BOOK A1 - Stadler, Heike T1 - Öffentliche Bibliotheken im Bürgerhaushalt T3 - KWI-Arbeitshefte N2 - Intention der Arbeit war es, die bibliothekarische Fachwelt zunächst auf den Begriff und die Bedeutung des Bürgerhaushaltes aufmerksam zu machen und eine Auseinandersetzung mit der Thematik zu fördern. Die Öffentliche Bibliothek kann ein Diskussions- bzw. Beteiligungsgegenstand zwischen Bürgerschaft und Politik sowie Verwaltung sein, wenn es im partizipatorischen Verfahren des Bürgerhaushaltes darum geht, Modernisierungsergebnisse in einer Stadt durch gezielte Finanzierung zu erlangen. Eruiert wurde, ob der Bürgerhaushalt das Potential hat, zur Modernisierung von Dienstleistungen Öffentlicher Bibliotheken beizutragen. Mittels Interviews wurden Informationen gesammelt, aufbereitet und ausgewertet. T3 - KWI-Arbeitshefte - 20 KW - Öffentliche Bibliothek KW - Partizipation KW - public library KW - participation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-49248 SN - 978-3-86956-111-0 SN - 1616-8127 SN - 2191-6713 IS - 20 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Stadie, Nicole T1 - Entwicklungsdyslexie im Rahmen kognitiv-orientierter Erklärungsansätze JF - Spektrum Patholinguistik Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-54191 SN - 1869-3822 SN - 1866-9433 IS - 4 SP - 23 EP - 31 ER - TY - JOUR A1 - Stadie, Nicole T1 - Entwicklungsdyslexie im Rahmen kognitiv-orientierter Erklärungsätze Y1 - 2011 ER - TY - JOUR A1 - Srinivasan, K. A1 - Senthilkumar, Dharmapuri Vijayan A1 - Murali, K. A1 - Lakshmanan, Muthusamy A1 - Kurths, Jürgen T1 - Synchronization transitions in coupled time-delay electronic circuits with a threshold nonlinearity JF - Chaos : an interdisciplinary journal of nonlinear science N2 - Experimental observations of typical kinds of synchronization transitions are reported in unidirectionally coupled time-delay electronic circuits with a threshold nonlinearity and two time delays, namely feedback delay tau(1) and coupling delay tau(2). We have observed transitions from anticipatory to lag via complete synchronization and their inverse counterparts with excitatory and inhibitory couplings, respectively, as a function of the coupling delay tau(2). The anticipating and lag times depend on the difference between the feedback and the coupling delays. A single stability condition for all the different types of synchronization is found to be valid as the stability condition is independent of both the delays. Further, the existence of different kinds of synchronizations observed experimentally is corroborated by numerical simulations and from the changes in the Lyapunov exponents of the coupled time-delay systems. Y1 - 2011 U6 - https://doi.org/10.1063/1.3591791 SN - 1054-1500 VL - 21 IS - 2 PB - American Institute of Physics CY - Melville ER - TY - JOUR A1 - Springer, Anne A1 - Brandstädter, Simone A1 - Liepelt, Roman A1 - Birngruber, Teresa A1 - Giese, Martin A1 - Mechsner, Franz A1 - Prinz, Wolfgang T1 - Motor execution affects action prediction JF - Brain and cognition : a journal of experimental and clinical research N2 - Previous studies provided evidence of the claim that the prediction of occluded action involves real-time simulation. We report two experiments that aimed to study how real-time simulation is affected by simultaneous action execution under conditions of full, partial or no overlap between observed and executed actions. This overlap was analysed by comparing the body sides and the movement kinematics involved in the observed and the executed action. While performing actions, participants observed point-light (PL) actions that were interrupted by an occluder, followed by a test pose. The task was to judge whether the test pose depicted a continuation of the occluded action in the same depth angle. Using a paradigm proposed by Graf et al., we independently manipulated the duration of the occluder and the temporal advance of the test pose relative to occlusion onset (occluder time and pose time, respectively). This paradigm allows the assessment of real-time simulation, based on prediction performance across different occluder time/pose time combinations (i.e., improved task performance with decreasing time distance between occluder time and pose time is taken to reflect real-time simulation). The PL actor could be perceived as from the front or back, as indicated by task instructions. In Experiment 1 (front view instructions), evidence of action simulation was obtained for partial overlap (i.e., observed and performed action corresponded either in body side or movement kinematics), but not for full or no overlap conditions. The same pattern was obtained in Experiment 2 (back view instructions), ruling out a spatial compatibility explanation for the real-time pattern observed. Our results suggest that motor processes affect action prediction and real-time simulation. The strength of their impact varies as a function of the overlap between observed and executed actions. KW - Action prediction KW - Internal simulation KW - Motor execution KW - Common coding KW - Perception-action-link Y1 - 2011 U6 - https://doi.org/10.1016/j.bandc.2011.03.007 SN - 0278-2626 VL - 76 IS - 1 SP - 26 EP - 36 PB - Elsevier CY - San Diego ER - TY - JOUR A1 - Springer, Anne T1 - Selbst, Kultur und soziale Kognition JF - Das Bild zwischen Kognition und Kreativität Y1 - 2011 SN - 978-3-8376-1365-0 SP - 171 EP - 195 PB - Transcript CY - Bielefeld ER - TY - THES A1 - Spreyer, Kathrin T1 - Does it have to be trees? : Data-driven dependency parsing with incomplete and noisy training data T1 - Müssen es denn Bäume sein? Daten-gesteuertes Dependenzparsing mit unvollständigen und verrauschten Trainingsdaten N2 - We present a novel approach to training data-driven dependency parsers on incomplete annotations. Our parsers are simple modifications of two well-known dependency parsers, the transition-based Malt parser and the graph-based MST parser. While previous work on parsing with incomplete data has typically couched the task in frameworks of unsupervised or semi-supervised machine learning, we essentially treat it as a supervised problem. In particular, we propose what we call agnostic parsers which hide all fragmentation in the training data from their supervised components. We present experimental results with training data that was obtained by means of annotation projection. Annotation projection is a resource-lean technique which allows us to transfer annotations from one language to another within a parallel corpus. However, the output tends to be noisy and incomplete due to cross-lingual non-parallelism and error-prone word alignments. This makes the projected annotations a suitable test bed for our fragment parsers. Our results show that (i) dependency parsers trained on large amounts of projected annotations achieve higher accuracy than the direct projections, and that (ii) our agnostic fragment parsers perform roughly on a par with the original parsers which are trained only on strictly filtered, complete trees. Finally, (iii) when our fragment parsers are trained on artificially fragmented but otherwise gold standard dependencies, the performance loss is moderate even with up to 50% of all edges removed. N2 - Wir präsentieren eine neuartige Herangehensweise an das Trainieren von daten-gesteuerten Dependenzparsern auf unvollständigen Annotationen. Unsere Parser sind einfache Varianten von zwei bekannten Dependenzparsern, nämlich des transitions-basierten Malt-Parsers sowie des graph-basierten MST-Parsers. Während frühere Arbeiten zum Parsing mit unvollständigen Daten die Aufgabe meist in Frameworks für unüberwachtes oder schwach überwachtes maschinelles Lernen gebettet haben, behandeln wir sie im Wesentlichen mit überwachten Lernverfahren. Insbesondere schlagen wir "agnostische" Parser vor, die jegliche Fragmentierung der Trainingsdaten vor ihren daten-gesteuerten Lernkomponenten verbergen. Wir stellen Versuchsergebnisse mit Trainingsdaten vor, die mithilfe von Annotationsprojektion gewonnen wurden. Annotationsprojektion ist ein Verfahren, das es uns erlaubt, innerhalb eines Parallelkorpus Annotationen von einer Sprache auf eine andere zu übertragen. Bedingt durch begrenzten crosslingualen Parallelismus und fehleranfällige Wortalinierung ist die Ausgabe des Projektionsschrittes jedoch üblicherweise verrauscht und unvollständig. Gerade dies macht projizierte Annotationen zu einer angemessenen Testumgebung für unsere fragment-fähigen Parser. Unsere Ergebnisse belegen, dass (i) Dependenzparser, die auf großen Mengen von projizierten Annotationen trainiert wurden, größere Genauigkeit erzielen als die zugrundeliegenden direkten Projektionen, und dass (ii) die Genauigkeit unserer agnostischen, fragment-fähigen Parser der Genauigkeit der Originalparser (trainiert auf streng gefilterten, komplett projizierten Bäumen) annähernd gleichgestellt ist. Schließlich zeigen wir mit künstlich fragmentierten Gold-Standard-Daten, dass (iii) der Verlust an Genauigkeit selbst dann bescheiden bleibt, wenn bis zu 50% aller Kanten in den Trainingsdaten fehlen. KW - Dependenzparsing KW - partielle Annotationen KW - schwach überwachte Lernverfahren KW - Annotationsprojektion KW - Parallelkorpora KW - dependency parsing KW - partial annotations KW - weakly supervised learning techniques KW - annotation projection KW - parallel corpora Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57498 ER - TY - THES A1 - Spoerr, Kathrin T1 - Recht und Revolution : deutsche Ökonomen und ihr Einfluss auf das Recht der Weimarer Republik - eine Zeitschriftenschau 1917 - 1920 T2 - Rechtshistorische Reihe Y1 - 2011 SN - 978-3-631-60327-7 SN - 0344-290X VL - 412 PB - Lang CY - Frankfurt am Main ER - TY - JOUR A1 - Spijkerman, Elly A1 - Wacker, Alexander T1 - Interactions between P-limitation and different C conditions on the fatty acid composition of an extremophile microalga JF - Extremophiles : life under extreme conditions N2 - The extremophilic microalga Chlamydomonas acidophila inhabits very acidic waters (pH 2-3.5), where its growth is often limited by phosphorus (P) or colimited by P and inorganic carbon (CO(2)). Because this alga is a major food source for predators in acidic habitats, we studied its fatty acid content, which reflects their quality as food, grown under a combination of P-limited and different carbon conditions (either mixotrophically with light + glucose or at high or low CO(2), both without glucose). The fatty acid composition largely depended on the cellular P content: stringent P-limited cells had a higher total fatty acid concentration and had a lower percentage of polyunsaturated fatty acids. An additional limitation for CO(2) inhibited this decrease, especially reflected in enhanced concentrations of 18:3(9,12,15) and 16:4(3,7,10,13), resulting in cells relatively rich in polyunsaturated fatty acids under colimiting growth conditions. The percentage of polyunsaturated to total fatty acid content was positively related with maximum photosynthesis under all conditions applied. The two factors, P and CO(2), thus interact in their effect on the fatty acid composition in C. acidophila, and colimited cells P-limited algae can be considered a superior food source for herbivores because of the high total fatty acid content and relative richness in polyunsaturated fatty acids. KW - Acidophilic algae KW - Cellular P quota KW - Chlamydomonas acidophila KW - Chlorophyceae KW - Colimitation KW - CO(2) KW - Fatty acid composition KW - Food quality KW - Glucose KW - Mixotrophy KW - Photosynthesis KW - Phytoplankton KW - Phosphorus limitation Y1 - 2011 U6 - https://doi.org/10.1007/s00792-011-0390-3 SN - 1431-0651 VL - 15 IS - 5 SP - 597 EP - 609 PB - Springer CY - Tokyo ER - TY - JOUR A1 - Spijkerman, Elly A1 - de Castro, Francisco A1 - Gaedke, Ursula T1 - Independent Colimitation for Carbon Dioxide and Inorganic Phosphorus JF - PLoS one N2 - Simultaneous limitation of plant growth by two or more nutrients is increasingly acknowledged as a common phenomenon in nature, but its cellular mechanisms are far from understood. We investigated the uptake kinetics of CO(2) and phosphorus of the algae Chlamydomonas acidophila in response to growth at limiting conditions of CO(2) and phosphorus. In addition, we fitted the data to four different Monod-type models: one assuming Liebigs Law of the minimum, one assuming that the affinity for the uptake of one nutrient is not influenced by the supply of the other (independent colimitation) and two where the uptake affinity for one nutrient depends on the supply of the other (dependent colimitation). In addition we asked whether the physiological response under colimitation differs from that under single nutrient limitation. We found no negative correlation between the affinities for uptake of the two nutrients, thereby rejecting a dependent colimitation. Kinetic data were supported by a better model fit assuming independent uptake of colimiting nutrients than when assuming Liebigs Law of the minimum or a dependent colimitation. Results show that cell nutrient homeostasis regulated nutrient acquisition which resulted in a trade-off in the maximum uptake rates of CO(2) and phosphorus, possibly driven by space limitation on the cell membrane for porters for the different nutrients. Hence, the response to colimitation deviated from that to a single nutrient limitation. In conclusion, responses to single nutrient limitation cannot be extrapolated to situations where multiple nutrients are limiting, which calls for colimitation experiments and models to properly predict growth responses to a changing natural environment. These deviations from single nutrient limitation response under colimiting conditions and independent colimitation may also hold for other nutrients in algae and in higher plants. Y1 - 2011 U6 - https://doi.org/10.1371/journal.pone.0028219 SN - 1932-6203 VL - 6 IS - 12 PB - PLoS CY - San Fransisco ER - TY - JOUR A1 - Spijkerman, Elly T1 - The expression of a carbon concentrating mechanism in Chlamydomonas acidophila under variable phosphorus, iron, and CO2 concentrations JF - Photosynthesis research N2 - The CO2 acquisition was analyzed in Chlamydomonas acidophila at pH 2.4 in a range of medium P and Fe concentrations and at high and low CO2 condition. The inorganic carbon concentrating factor (CCF) was related to cellular P quota (Q(p)), maximum CO2-uptake rate by photosynthesis (V-max; O-2), half saturation constant for CO2 uptake (K-0.5), and medium Fe concentration. There was no effect of the medium Fe concentration on the CCF. The CCF increased with increasing Q(p) in both high and low CO2 grown algae, but maximum Q(p) was 6-fold higher in the low CO2 cells. In high CO2 conditions, the CCF was low, ranging between 0.8 and 3.5. High CCF values up to 9.1 were only observed in CO2-limited cells, but P- and CO2-colimited cells had a low CCF. High CCF did not relate with a low K-0.5 as all CO2-limited cells had a low K-0.5 (<4 mu M CO2). High Ci-pools in cells with high Qp suggested the presence of an active CO2-uptake mechanism. The CCF also increased with increasing V-max; O-2 which reflect an adaptation to the nutrient in highest demand (CO2) under balanced growth conditions. It is proposed that the size of the CCF in C. acidophila is more strongly related to porter density for CO2 uptake (reflected in V-max; O-2) and less- to high-affinity CO2 uptake (low K-0.5) at balanced growth. In addition, high CCF can only be realized with high Q(p). KW - C3 photosynthesis KW - Micro-algae KW - Carbon concentrating mechanism KW - Phosphorus limitation KW - Iron toxicity Y1 - 2011 U6 - https://doi.org/10.1007/s11120-010-9607-z SN - 0166-8595 VL - 109 IS - 1-3 SP - 179 EP - 189 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Spies, Dennis A1 - Franzmann, Simon T. T1 - A two-dimensional approach to the political opportunity structure of extreme right parties in Western Europe JF - West European politics N2 - Previous studies on the electoral fortunes of extreme right parties (ERPs) have pointed to the importance of variables of party competition for the success - or failure - of ERPs. These studies vary greatly when it comes to describing the political opportunity structure of the extreme right. Apart from their methodological differences, existing studies differ especially with regard to the assumed underlying dimension of party competition. This article tests the impact of three frequently discussed variables in the political opportunity structure of ERPs (mainstream party convergence, position of the established right and party system polarisation) on the vote share of ERPs in Western Europe. In addition to examining previous studies in this field, it focuses on the interplay between the economic and the cultural dimensions as part of the political opportunity structure. The authors show that a decrease in polarisation with regard to economic questions is accompanied by a growing salience of ERPs' core issues, leading in the end to an increase in ERPs' vote share. Y1 - 2011 U6 - https://doi.org/10.1080/01402382.2011.591096 SN - 0140-2382 VL - 34 IS - 5 SP - 1044 EP - 1069 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - JOUR A1 - Sperfeld, Erik A1 - Wacker, Alexander T1 - Temperature- and cholesterol-induced changes in eicosapentaenoic acid limitation of Daphnia magna determined by a promising method to estimate growth saturation thresholds JF - Limnology and oceanography N2 - We present data on eicosapentaenoic acid (EPA)-limited growth responses of Daphnia magna under different temperatures and different dietary cholesterol availabilities to assess how EPA growth saturation thresholds depend on changing environmental conditions. D. magna was raised on gradients of dietary EPA at 15 degrees C and 20 degrees C with high cholesterol supply and at 20 degrees C with low and high cholesterol supply in laboratory experiments. A new method was applied to estimate EPA growth saturation thresholds on the basis of fitted saturation curves using bootstrapped data. The EPA threshold at which 75% and 90% of maximum growth was reached ranged from 0.7 to 1.6 mu g EPA (mg dietary C)(-1) and 2.0 to 4.9 mu g EPA (mg dietary C)(-1), respectively. Previously reported EPA concentrations in natural seston of many different lakes suggest that the thresholds measured here indicate a frequent potential for at least moderate EPA limitation in nature. Furthermore, the calculated EPA thresholds were higher in treatments of low compared with high temperature and higher in treatments of low compared with high cholesterol availability. The EPA-dependent growth responses were more strongly affected by temperature than by cholesterol availability. Our results suggest that EPA growth saturation thresholds for a particular Daphnia species probably vary in nature under different environmental conditions. Y1 - 2011 U6 - https://doi.org/10.4319/lo.2011.56.4.1273 SN - 0024-3590 VL - 56 IS - 4 SP - 1273 EP - 1284 PB - Wiley CY - Waco ER - TY - THES A1 - Sperfeld, Erik T1 - Effects of temperature and co-limiting nutritional components on life history traits of Daphnia magna and its biochemical composition Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Speck, Janina A1 - Arndt, Katja Maren A1 - Müller, Kristian M. T1 - Efficient phage display of intracellularly folded proteins mediated by the TAT pathway JF - Protein engineering design & selection N2 - Phage display with filamentous phages is widely applied and well developed, yet proteins requiring a cytoplasmic environment for correct folding still defy attempts at functional display. To extend applicability of phage display, we employed the twin-arginine translocation (TAT) pathway to incorporate proteins fused to the C-terminal domain of the geneIII protein into phage particles. We investigated functionality and display level of fluorescent proteins depending on the translocation pathway, which was the TAT, general secretory (SEC) or signal recognition particle (SRP) pathway mediated by the TorA, PelB or DsbA signal sequences, respectively. Importantly, for green fluorescent protein, yellow fluorescent protein and cyan fluorescent protein, only TAT, but not SEC or SRP, translocation led to fluorescence of purified phage particles, although all three proteins could be displayed regardless of the translocation pathway. In contrast, the monomeric red fluorescent protein mCherry was functionally displayed regardless of the translocation pathway. Hence, correct folding and fluorophor formation of mCherry is not limited to the cytosol. Furthermore, we successfully displayed firefly luciferase as well as an 83 kDa argonaute protein, both containing free cysteines. This demonstrates broad applicability of the TAT-mediated phagemid system for the display of proteins requiring cytoplasmic factors for correct folding and should prove useful for the display of proteins requiring incorporation of co-factors or oligomerization to gain function. KW - g3p KW - phagemid display KW - protein design KW - protein engineering KW - selection Y1 - 2011 U6 - https://doi.org/10.1093/protein/gzr001 SN - 1741-0126 VL - 24 IS - 6 SP - 473 EP - 484 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Soto Baeuerle, Maria Victoria A1 - Arriagada Gonzalez, Joselyn A1 - Castro Correa, Carmen Paz A1 - Maerker, Michael A1 - Rodolfi, Giuliano T1 - Relationship between the change in land use in the Aconcagua basin and its correlative sandy coastal. Central Chile JF - Revista de geografía Norte Grande N2 - In the Aconcagua basin the modernization and intensification of land use have resulted both in an agricultural conversion, and the increase in area cultivated. This process has been very intense as far that have entered new areas beyond the limits of the valley and towards sloping ground. This signals changes in land use over the vegetation coverage models. The analysis of the geomorphology of the coastline in detail, accounts for the occurrence of transformations on the beach and dunes that are spatially less significant, but evolutionarily important, since they show a sediment feeding, which could be correlated with changes in vegetation cover in the basin KW - Land use change KW - sediment input KW - coastal sand dunes Y1 - 2011 SN - 0718-3402 IS - 50 SP - 187 EP - 202 PB - Instituto de Geografía, Pontificia Universidad Católica de Chile CY - Santiago ER - TY - JOUR A1 - Sorge, Arndt T1 - Too big to fail the inside story of how wall street and washington fought to save the financial system from crisis-and themselves JF - Socio-economic review KW - financial crisis KW - financial institutions KW - financial markets KW - capitalism KW - globalization Y1 - 2011 SN - 1475-1461 VL - 9 IS - 1 SP - 169 EP - 186 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Sorge, Arndt T1 - A failure of capitalism the crisis of '08 and the descent into depression JF - Socio-economic review KW - financial crisis KW - financial institutions KW - financial markets KW - capitalism KW - globalization Y1 - 2011 SN - 1475-1461 VL - 9 IS - 1 SP - 169 EP - 186 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Sorge, Arndt T1 - How markets fail the logic of economic calamities JF - Socio-economic review KW - financial crisis KW - financial institutions KW - financial markets KW - capitalism KW - globalization Y1 - 2011 SN - 1475-1461 VL - 9 IS - 1 SP - 169 EP - 186 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Sorge, Arndt T1 - This time is different eight centuries of financial folly JF - Socio-economic review KW - financial crisis KW - financial institutions KW - financial markets KW - capitalism KW - globalization Y1 - 2011 SN - 1475-1461 VL - 9 IS - 1 SP - 169 EP - 186 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Solomon, Francisca T1 - Zwischen Lebenswelt und literarischer Raumkonstruktion BT - Das galizische Schtetl bei Nathan Samuely und Karl Emil Franzos JF - PaRDeS : Zeitschrift der Vereinigung für Jüdische Studien e.V. N2 - Der Beitrag widmet sich dem Genre der „galizischen“ Ghettogeschichte und bezieht sich auf Nathan Samuelys zweibändige Cultur-Bilder aus dem jüdischen Leben in Galizien (1885 und 1892) und auf Karl Emil Franzos’ Novellenzyklus Die Juden von Barnow (1877) sowie stellenweise auf ausgewählte Texte aus Franzos’ Band Aus Halb-Asien. Culturbilder aus Galizien, der Bukowina, Südrußland und Rumänien (1876). Durchgeführt wird eine punktuelle Analyse der literarischen Typologie und der Handlungsräume in den genannten Texten, wobei die Ghettogeschichten in ihrer Gesamtheit als ein komplexes soziokulturelles Konstrukt einer Mikrogesellschaft problematisiert werden. N2 - The article focuses on the genre of „Galician” ghetto story. It refers to Nathan Samuely’s two volumes of Cultur-Bilder aus dem jüdischen Leben in Galizien (1885 and 1892) and Karl Emil Franzos’ novel cycle Die Juden von Barnow (1877) as well as to selected texts from his Aus Halb-Asien. Culturbilder aus Galizien, der Bukowina, Südrußland und Rumänien (1876). The aim of this study is to perform a selective analysis of the literary typology and the spheres of action in the previously mentioned texts. The ghetto stories are to be analyzed in their entirety as a complex socio-cultural construct of a microsociety. Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53280 SN - 1614-6492 SN - 1862-7684 IS - 17 SP - 143 EP - 156 ER - TY - JOUR A1 - Sobel, Edward A1 - Schoenbohm, Lindsay M. A1 - Chen, Jie A1 - Thiede, Rasmus Christoph A1 - Stockli, Daniel F. A1 - Sudo, Masafumi A1 - Strecker, Manfred T1 - Late Miocene-Pliocene deceleration of dextral slip between Pamir and Tarim: Implications for Pamir orogenesis JF - EARTH AND PLANETARY SCIENCE LETTERS N2 - The timing of the late Cenozoic collision between the Pamir salient and the Tien Shan as well as changes in the relative motion between the Pamir and Tarim are poorly constrained. The northern margin of the Pamir salient indented northward by similar to 300 km during the late Cenozoic, accommodated by south-dipping intracontinental subduction along the Main Pamir Thrust (MPT) coupled to strike-slip faults on the eastern flank of the orogen and both strike-slip and thrust faults on the western margin. The Kashgar-Yecheng transfer system (KYTS) is the main dextral slip shear zone separating Tarim from the Eastern Pamir, with an estimated cumulative offset of similar to 280 km at an average late Cenozoic dextral slip rate of 11-15 mm/a (Cowgill, 2010). In order to better constrain the slip history of the KYTS, we collected thermochronologic samples along the eastward-flowing, deeply incised, antecedent Tashkorgan-Yarkand River, which crosses the fault system on the eastern flank of the orogen. We present 29 new biotite (40)Ar/(39)Ar ages, apatite and zircon (U-Th-Sm)/He ages, and apatite fission track (AFT) analysis, combined with published muscovite and biotite (40)Ar/(39)Ar and AFT data, to create a unique thermochronologic dataset in this poorly studied and remote region. We constrain the timing of four major N-trending faults: the latter three are strands of the KYTS. The westernmost, the Kuke fault, experienced significant dip-slip, west-side-up displacement between > 12 and 6 Ma. To the east, within the KYTS, our new thermochronologic data and geomorphic observations suggest that the Kumtag and Kusilaf dextral slip faults have been inactive since at least 3-5 Ma. Long-term incision rates across the Aertashi dextral slip fault, the easternmost strand of the KYTS, are compatible with slow horizontal slip rates of 1.7-5.3 mm/a over the past 3 to 5 Ma. In summary, these data show that the slip rate of the KYTS decreased substantially during the late Miocene or Pliocene. Furthermore, Miocene-present regional kinematic reconstructions suggest that this deceleration reflects the substantial increase of northward motion of Tarim rather than a significant decrease of the northward velocity of the Pamir. (C) 2011 Elsevier B.V. All rights reserved. KW - thermochronology KW - neotectonics KW - Pamir KW - Tien Shan KW - strike-slip fault KW - intracontinental subduction Y1 - 2011 U6 - https://doi.org/10.1016/j.epsl.2011.02.012 SN - 0012-821X VL - 304 IS - 3-4 SP - 369 EP - 378 PB - ELSEVIER SCIENCE BV CY - AMSTERDAM ER - TY - JOUR A1 - Smola, Klavdia T1 - Russisch-jüdische Prosa der Gegenwart BT - Identität, Fremdheit, jüdische Poetik JF - Texturen – Identitäten – Theorien : Ergebnisse des Arbeitstreffens des Jungen Forums Slavistische Literaturwissenschaft in Trier 2010 N2 - - Kulturhistorischer Exkurs - Postsowjetische jüdische Prosa: politischer Widerstand vs. kulturelle Partizipation - Fazit - Literaturverzeichnis - Zur Autorin Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-58785 SP - 203 EP - 218 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - CHAP A1 - Smith, Mychal Daijon A1 - Mattos, Carla A1 - Barbiz, Stefanie T1 - The multiple solvent crystal structures of P22TSP T2 - The FASEB journal : the official journal of the Federation of American Societies for Experimental Biology Y1 - 2011 SN - 0892-6638 VL - 25 IS - 2 PB - Federation of American Societies for Experimental Biology CY - Bethesda ER - TY - BOOK A1 - Smirnov, Sergey A1 - Zamani Farahani, Armin A1 - Weske, Mathias T1 - State propagation in abstracted business processes N2 - Business process models are abstractions of concrete operational procedures that occur in the daily business of organizations. To cope with the complexity of these models, business process model abstraction has been introduced recently. Its goal is to derive from a detailed process model several abstract models that provide a high-level understanding of the process. While techniques for constructing abstract models are reported in the literature, little is known about the relationships between process instances and abstract models. In this paper we show how the state of an abstract activity can be calculated from the states of related, detailed process activities as they happen. The approach uses activity state propagation. With state uniqueness and state transition correctness we introduce formal properties that improve the understanding of state propagation. Algorithms to check these properties are devised. Finally, we use behavioral profiles to identify and classify behavioral inconsistencies in abstract process models that might occur, once activity state propagation is used. N2 - Geschäftsprozessmodelle sind Abstraktionen konkreter operationaler Vorgänge, die im täglichen Geschäftsablauf von Organisationen auftreten. Um die Komplexität solcher Modelle zu bewältigen, wurde die Geschäftsprozessmodelabstraktion eingeführt. Ziel ist dabei, von einem detaillierten Prozessmodel mehrere abstrakte Modelle abzuleiten, um so auf einer höheren Abstraktionsstufe ein Verständnis für den Prozess zu bekommen. Während viel in der Literatur über Techniken zur Konstruktion abstrakter Modelle berichtet wurde, ist wenig über die Beziehungen zwischen Prozessinstanzen und abstrakten Modellen bekannt. In dieser Arbeit zeigen wir, wie der Zustand einer abstrakten Aktivität aus den Zuständen ihrer entsprechenden detaillierten Prozessaktivitäten zur Laufzeit berechnet werden kann. Der Ansatz basiert dabei auf der Übertragung des Aktivitätszustands. Mit der Zustandseindeutigkeit und der Korrektheit der Zustandstransitionen führen wir formale Kriterien ein, die das Verständnis der Zustandsübertragung erleichtern. Zudem sind Algorithmen entwickelt worden, um diese Kriterien zu überprüfen. Außerdem nutzen wir Verhaltensprofile um Inkonsistenzen im Verhalten abstrakter Prozessmodelle zu identifizieren und zu klassifizieren, die auftreten können, wenn die Aktivitätszustände gemäß den Regeln abgebildet werden. T3 - Technische Berichte des Hasso-Plattner-Instituts für Digital Engineering an der Universität Potsdam - 47 KW - Abstraktion von Geschäftsprozessmodellen KW - Prozessinstanz KW - Propagation von Aktivitätsinstanzzuständen KW - business process model abstraction KW - process instance KW - activity instance state propagation Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-51480 SN - 978-3-86956-130-1 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - THES A1 - Smirnov, Sergey T1 - Business process model abstraction T1 - Abstraktion von Geschäftsprozessmodellen N2 - Business process models are used within a range of organizational initiatives, where every stakeholder has a unique perspective on a process and demands the respective model. As a consequence, multiple process models capturing the very same business process coexist. Keeping such models in sync is a challenge within an ever changing business environment: once a process is changed, all its models have to be updated. Due to a large number of models and their complex relations, model maintenance becomes error-prone and expensive. Against this background, business process model abstraction emerged as an operation reducing the number of stored process models and facilitating model management. Business process model abstraction is an operation preserving essential process properties and leaving out insignificant details in order to retain information relevant for a particular purpose. Process model abstraction has been addressed by several researchers. The focus of their studies has been on particular use cases and model transformations supporting these use cases. This thesis systematically approaches the problem of business process model abstraction shaping the outcome into a framework. We investigate the current industry demand in abstraction summarizing it in a catalog of business process model abstraction use cases. The thesis focuses on one prominent use case where the user demands a model with coarse-grained activities and overall process ordering constraints. We develop model transformations that support this use case starting with the transformations based on process model structure analysis. Further, abstraction methods considering the semantics of process model elements are investigated. First, we suggest how semantically related activities can be discovered in process models-a barely researched challenge. The thesis validates the designed abstraction methods against sets of industrial process models and discusses the method implementation aspects. Second, we develop a novel model transformation, which combined with the related activity discovery allows flexible non-hierarchical abstraction. In this way this thesis advocates novel model transformations that facilitate business process model management and provides the foundations for innovative tool support. N2 - Geschäftsprozessmodelle werden in einer Fülle organisatorischer Initiativen eingesetzt, wobei verschiedene Stakeholder individuelle Ansprüche an die Sicht auf den jeweiligen Prozess haben. Dies führt dazu, dass zu einem Geschäftsprozess eine Vielzahl unterschiedlicher Modelle existiert. In einer sich ständig verändernden Geschäftsumgebung ist es daher schwierig, diese Vielzahl von Modellen konsistent zu halten: Ändert sich sich ein Prozess, müssen alle Modelle, die ihn beschreiben, aktualisiert werden. Aufgrund der schieren Menge an Prozessmodellen und ihrer komplexen Beziehungen zueinander, erhöhen sich Aufwand und Kosten zur Pflege aller Modelle enorm. Vor diesem Hintergrund ermöglicht die Abstraktion von Geschäftsprozessmodellen, die Menge der Modelle zu reduzieren und damit ihre Verwaltung zu vereinfachen. Abstraktion von Geschäftsprozessmodellen bezeichnet eine Transformation eines Prozessmodells, so dass es für einen bestimmten Zweck besonders geeignet ist. Bei der Abstraktion von Geschäftsprozessen bleiben essentielle Eigenschaften eines Modells erhalten, während irrelevante Eigenschaften verworfen werden. Mehrere Studien stellen Prozessmodellabstraktion in den Fokus und konzentrieren sich auf konkrete Anwendungsfälle, für die sie geeignete Transformationen entwickelt haben. Diese Dissertation untersucht das Problem der Prozessmodellabstraktion und systematisiert die Lösung in einem Framework. Aktuelle Anforderungen der Industrie an die Abstraktion von Prozessmodellen wurden recherchiert und in einem Katalog von Anwendungsfällen zusammengefasst, von denen ein besonderer für die weiteren Untersuchungen ausgewählt wurde. In diesem Fall erwartet der Nutzer ein Modell niedrigeren Detailgrades, in welchem die Kontrollflussbeziehungen des Ursprungsmodells erhalten bleiben. Beginnend bei Modelltransformationen, die auf der Analyse der Prozessmodellstruktur aufbauen, entwickeln wir neuartige Abstraktionsoperationen zur Unterstützung dieses Anwendungsfalles. Darüber hinaus untersuchen wir Abstraktionsmethoden, welche die Semantik von Prozessmodellelementen berücksichtigen. Zum einen zeigen wir, wie Aktivitäten ermittelt werden können, die miteinander in semantischer Beziehung stehen - ein Problem, das bisher nur unzureichend betrachtet wurde. Die vorgeschlagenen Methoden werden mithilfe industrieller Prozessmodellsammlungen validiert und deren Umsetzung diskutiert. Zum anderen schlagen wir eine innovative Modelltransformation zur nicht-hierarchischen Abstraktion von Prozessmodellen vor. Dieser liegt die Ermittlung in Beziehung stehender Aktivitäten zugrunde. Demzufolge präsentiert diese Arbeit eine originäre Methode zur Prozessmodellabstraktion, die die Verwaltung von Geschäftsprozessmodellen vereinfacht und den Grundstein für innovative Softwarewerkzeuge legt. KW - Abstraktion KW - Prozess KW - Modell KW - Transformation KW - Komplexität KW - abstraction KW - process KW - model KW - transformation KW - complexity Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-60258 ER - TY - THES A1 - Skrobanek, Michaela T1 - Die Qualität von Angebotssituationen beim Vertrieb von Managmentberatungsleistungen : eine empirische Studie Y1 - 2011 SN - 978-3-8349-2625-8 PB - Gabler Verlag / Springer Fachmedien Wiesbaden GmbH Wiesbaden CY - Wiesbaden ER - TY - JOUR A1 - Skrabania, Katja A1 - Miasnikova, Anna A1 - Bivigou Koumba, Achille Mayelle A1 - Zehm, Daniel A1 - Laschewsky, André T1 - Examining the UV-vis absorption of RAFT chain transfer agents and their use for polymer analysis JF - Polymer Chemistry N2 - The absorption characteristics of a large set of thiocarbonyl based chain transfer agents (CTAs) were studied by UV-vis spectroscopy in order to identify appropriate conditions for exploiting their absorbance bands in end-group analysis of polymers prepared by reversible addition-fragmentation chain transfer (RAFT) polymerisation. Substitution pattern and solvent polarity were found to affect notably the wavelengths and intensities of the pi-pi*- and n-pi*-transition of the thiocarbonyl bond of dithioester and trithiocarbonate RAFT agents. Therefore, it is advisable to refer in end group analysis to the spectral parameters of low molar mass analogues of the active polymer chain ends, rather than to rely on the specific RAFT agent engaged in the polymerisation. When using appropriate conditions, the quantification of the thiocarbonyl end-groups via the pi-pi* band of the thiocarbonyl moiety around 300-310 nm allows a facile, sensitive and surprisingly precise estimation of the number average molar mass of the polymers produced, without the need of particular end group labels. Moreover, when additional methods for absolute molar mass determination can be applied, the quantification of the thiocarbonyl end-groups by UV-spectroscopy provides a good estimate of the degree of active end group for a given polymer sample. Y1 - 2011 U6 - https://doi.org/10.1039/c1py00173f SN - 1759-9954 VL - 2 IS - 9 SP - 2074 EP - 2083 PB - Royal Society of Chemistry CY - Cambridge ER - TY - JOUR A1 - Skopeteas, Stavros A1 - Fanselow, Gisbert T1 - Focus and the exclusion of alternatives on the interaction of syntactic structure with pragmatic inference JF - Lingua : international review of general linguistics N2 - The claim that focus evokes a set of alternatives is a central issue in several accounts of the effects of focus on interpretation. This article presents two empirical studies that examine whether this property of focus is independent of contextual conditions. The syntactic operation at issue is object-fronting in German, Spanish, Greek, and Hungarian licensed by contexts involving focus on the object constituent. This operation evokes the intuition that the fronted referent excludes some or all relevant alternatives. The presented experiments deal with the question whether this interpretative property obligatorily accompanies the operation at issue or not. The empirical findings show that in German, Spanish, and Greek this intuition depends on properties of the context and is sensitive to the interaction with further discourse factors (in particular, the predictability of the referent). Hungarian displays a different data pattern: our data does not provide evidence that the syntactic operation at issue depends on the context or interacts with further discourse factors. This finding is in line with the view that evoking alternatives is inherent part of constituent-fronting in this language. KW - Focus KW - Word order KW - Pseudocleft KW - Exclusion of alternatives KW - Pragmatic inference Y1 - 2011 U6 - https://doi.org/10.1016/j.lingua.2011.05.005 SN - 0024-3841 VL - 121 IS - 11 SP - 1693 EP - 1706 PB - Elsevier CY - Amsterdam ER - TY - JOUR A1 - Skeel, R. D. A1 - Reich, Sebastian T1 - Corrected potential energy functions for constrained molecular dynamics JF - European physical journal special topics N2 - Atomic oscillations present in classical molecular dynamics restrict the step size that can be used. Multiple time stepping schemes offer only modest improvements, and implicit integrators are costly and inaccurate. The best approach may be to actually remove the highest frequency oscillations by constraining bond lengths and bond angles, thus permitting perhaps a 4-fold increase in the step size. However, omitting degrees of freedom produces errors in statistical averages, and rigid angles do not bend for strong excluded volume forces. These difficulties can be addressed by an enhanced treatment of holonomic constrained dynamics using ideas from papers of Fixman (1974) and Reich (1995, 1999). In particular, the 1995 paper proposes the use of "flexible" constraints, and the 1999 paper uses a modified potential energy function with rigid constraints to emulate flexible constraints. Presented here is a more direct and rigorous derivation of the latter approach, together with justification for the use of constraints in molecular modeling. With rigor comes limitations, so practical compromises are proposed: simplifications of the equations and their judicious application when assumptions are violated. Included are suggestions for new approaches. Y1 - 2011 U6 - https://doi.org/10.1140/epjst/e2011-01518-8 SN - 1951-6355 VL - 200 IS - 1 SP - 55 EP - 72 PB - Springer CY - Heidelberg ER - TY - GEN A1 - Sinn, Petra A1 - Engbert, Ralf T1 - Saccadic facilitation by modulation of microsaccades in natural backgrounds T2 - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe N2 - Saccades move objects of interest into the center of the visual field for high-acuity visual analysis. White, Stritzke, and Gegenfurtner (Current Biology, 18, 124–128, 2008) have shown that saccadic latencies in the context of a structured background are much shorter than those with an unstructured background at equal levels of visibility. This effect has been explained by possible preactivation of the saccadic circuitry whenever a structured background acts as a mask for potential saccade targets. Here, we show that background textures modulate rates of microsaccades during visual fixation. First, after a display change, structured backgrounds induce a stronger decrease of microsaccade rates than do uniform backgrounds. Second, we demonstrate that the occurrence of a microsaccade in a critical time window can delay a subsequent saccadic response. Taken together, our findings suggest that microsaccades contribute to the saccadic facilitation effect, due to a modulation of microsaccade rates by properties of the background. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 595 KW - eye movements KW - microsaccade KW - saccade latency KW - background texture KW - saccadic facilitation effect Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-431817 SN - 1866-8364 IS - 595 ER - TY - JOUR A1 - Sinn, Petra A1 - Engbert, Ralf T1 - Saccadic facilitation by modulation of microsaccades in natural backgrounds JF - Attention, perception, & psychophysics : AP&P ; a journal of the Psychonomic Society, Inc. N2 - Saccades move objects of interest into the center of the visual field for high-acuity visual analysis. White, Stritzke, and Gegenfurtner (Current Biology, 18, 124-128, 2008) have shown that saccadic latencies in the context of a structured background are much shorter than those with an unstructured background at equal levels of visibility. This effect has been explained by possible preactivation of the saccadic circuitry whenever a structured background acts as a mask for potential saccade targets. Here, we show that background textures modulate rates of microsaccades during visual fixation. First, after a display change, structured backgrounds induce a stronger decrease of microsaccade rates than do uniform backgrounds. Second, we demonstrate that the occurrence of a microsaccade in a critical time window can delay a subsequent saccadic response. Taken together, our findings suggest that microsaccades contribute to the saccadic facilitation effect, due to a modulation of microsaccade rates by properties of the background. KW - Eye movements KW - Microsaccade KW - Saccade latency KW - Background texture KW - Saccadic facilitation effect Y1 - 2011 U6 - https://doi.org/10.3758/s13414-011-0107-9 SN - 1943-3921 VL - 73 IS - 4 SP - 1029 EP - 1033 PB - Springer CY - New York ER - TY - JOUR A1 - Simsek, Yazgül T1 - Constructions with turkish sey and its German equivalent dings in Tirkish-German conversations : sey and dings in Turkish-German Y1 - 2011 SN - 978-90-272-3488-9 ER - TY - JOUR A1 - Siewert, Stephanie T1 - Die Topographie der Melancholie in transnationaler Perspektive Y1 - 2011 SN - 978-3-8376-1404-6 ER - TY - THES A1 - Siewert, Katharina T1 - Autoaggressive human t cell receptorrs and their antigen specificities Y1 - 2011 CY - Potsdam ER - TY - THES A1 - Sietz, Diana T1 - Dryland vulnerability : typical patterns and dynamics in support of vulnerability reduction efforts T1 - Vulnerabilität in Trockengebieten: typische Muster und Dynamiken als Beitrag für Ansätze zur Verminderung von Vulnerabilität N2 - The pronounced constraints on ecosystem functioning and human livelihoods in drylands are frequently exacerbated by natural and socio-economic stresses, including weather extremes and inequitable trade conditions. Therefore, a better understanding of the relation between these stresses and the socio-ecological systems is important for advancing dryland development. The concept of vulnerability as applied in this dissertation describes this relation as encompassing the exposure to climate, market and other stresses as well as the sensitivity of the systems to these stresses and their capacity to adapt. With regard to the interest in improving environmental and living conditions in drylands, this dissertation aims at a meaningful generalisation of heterogeneous vulnerability situations. A pattern recognition approach based on clustering revealed typical vulnerability-creating mechanisms at global and local scales. One study presents the first analysis of dryland vulnerability with global coverage at a sub-national resolution. The cluster analysis resulted in seven typical patterns of vulnerability according to quantitative indication of poverty, water stress, soil degradation, natural agro-constraints and isolation. Independent case studies served to validate the identified patterns and to prove the transferability of vulnerability-reducing approaches. Due to their worldwide coverage, the global results allow the evaluation of a specific system’s vulnerability in its wider context, even in poorly-documented areas. Moreover, climate vulnerability of smallholders was investigated with regard to their food security in the Peruvian Altiplano. Four typical groups of households were identified in this local dryland context using indicators for harvest failure risk, agricultural resources, education and non-agricultural income. An elaborate validation relying on independently acquired information demonstrated the clear correlation between weather-related damages and the identified clusters. It also showed that household-specific causes of vulnerability were consistent with the mechanisms implied by the corresponding patterns. The synthesis of the local study provides valuable insights into the tailoring of interventions that reflect the heterogeneity within the social group of smallholders. The conditions necessary to identify typical vulnerability patterns were summarised in five methodological steps. They aim to motivate and to facilitate the application of the selected pattern recognition approach in future vulnerability analyses. The five steps outline the elicitation of relevant cause-effect hypotheses and the quantitative indication of mechanisms as well as an evaluation of robustness, a validation and a ranking of the identified patterns. The precise definition of the hypotheses is essential to appropriately quantify the basic processes as well as to consistently interpret, validate and rank the clusters. In particular, the five steps reflect scale-dependent opportunities, such as the outcome-oriented aspect of validation in the local study. Furthermore, the clusters identified in Northeast Brazil were assessed in the light of important endogenous processes in the smallholder systems which dominate this region. In order to capture these processes, a qualitative dynamic model was developed using generalised rules of labour allocation, yield extraction, budget constitution and the dynamics of natural and technological resources. The model resulted in a cyclic trajectory encompassing four states with differing degree of criticality. The joint assessment revealed aggravating conditions in major parts of the study region due to the overuse of natural resources and the potential for impoverishment. The changes in vulnerability-creating mechanisms identified in Northeast Brazil are well-suited to informing local adjustments to large-scale intervention programmes, such as “Avança Brasil”. Overall, the categorisation of a limited number of typical patterns and dynamics presents an efficient approach to improving our understanding of dryland vulnerability. Appropriate decision-making for sustainable dryland development through vulnerability reduction can be significantly enhanced by pattern-specific entry points combined with insights into changing hotspots of vulnerability and the transferability of successful adaptation strategies. N2 - Die Grenzen ökologischer Funktionen und menschlicher Lebensweisen in Trockengebieten werden häufig durch natürlichen und sozio-ökonomischen Stress, wie extreme Wetterereignisse und ungerechte Handelsbedingungen, weiter verengt. Zur Förderung der Entwicklung in Trockengebieten ist es daher wichtig, die Beziehung zwischen den Stressfaktoren und den sozio-ökologischen Systemen besser zu verstehen. Das Konzept der Vulnerabilität, welches in der vorliegenden Dissertation angewandt wird, beschreibt dieses Verhältnis durch die Exposition, Sensitivität und Anpassungsfähigkeit von Systemen im Hinblick auf Klima-, Markt- und anderen Stress. Bezüglich des Interesses, die Umwelt- und Lebensbedingungen in Trockengebieten zu verbessern, zielt diese Dissertation darauf ab, die vielschichtigen Ursachen und Veränderungen von Vulnerabilität sinnvoll zu verallgemeinern. Eine clusterbasierte Mustererkennung zeigte typische Mechanismen auf, welche Vulnerabilität auf globaler und lokaler Ebene verursachen. Dabei stellt die globale Studie die erste flächendeckende Untersuchung von Vulnerabilität in Trockengebieten mit sub-nationaler Auflösung dar. Die Clusteranalyse identifizierte sieben typische Muster basierend auf der quantitativen Beschreibung von Armut, Wasserknappheit, Bodendegradation, natürlichen Produktionshemmnissen und Isolation. Die Gültigkeit der ermittelten Cluster und die Übertragbarkeit von Anpassungsmaßnahmen innerhalb ähnlicher Gebiete wurden anhand unabhängiger Fallstudien belegt. Die flächendeckende Erfassung erlaubt es, die Vulnerabilität eines Systems in seinem größeren Kontext zu bewerten, auch in weniger gut durch Fallstudien dokumentierten Gebieten. Weiterhin wurde die Klimavulnerabilität von Kleinbauern bezüglich ihrer Nahrungsmittelsicherung im peruanischen Altiplano untersucht. In diesem lokalen Kontext wurden vier Cluster von Haushalten gemäß ihrer Produktionsrisiken, landwirtschaftlichen Ressourcen, der Bildung und ihres nicht-landwirtschaftlichen Einkommens unterschieden. Eine erweiterte Gültigkeitsprüfung unter Nutzung unabhängig erhobener Informationen stellte heraus, dass wetterbedingte Schäden mit den ermittelten Clustern korrelieren und dass haushaltsspezifische Schadensursachen mit den durch die Muster angezeigten Mechanismen übereinstimmen. Die lokale Studie liefert wertvolle Hinweise auf bedarfsgerechte Eingriffe unter Beachtung der Heterogenität innerhalb der sozialen Gruppe der Kleinbauern. Die notwendigen Bedingungen zur Erkennung typischer Muster ergaben fünf methodische Schritte. Ihre Darlegung soll die Anwendung der gewählten Methode in zukünftigen Vulnerabilitätsstudien anregen und erleichtern. Die fünf Schritte umfassen die Ableitung relevanter Ursache-Wirkungs-Hypothesen, die Quantifizierung der Mechanismen, die Bewertung von Robustheit und Gültigkeit sowie die Ordnung der ermittelten Muster nach dem Grad der Vulnerabilität. Dabei ist die genaue Beschreibung der Hypothesen eine wesentliche Voraussetzung für die Quantifizierung der grundlegenden Prozesse sowie eine einheitliche Interpretation, Gültigkeitsprüfung und Ordnung der ermittelten Muster. Besondere Beachtung finden skalenbedingte Aspekte, wie beispielsweise die ergebnisorientierte Gültigkeitsprüfung in der lokalen Studie. Weiterhin wurden die in Nordostbrasilien ermittelten Cluster im Hinblick auf wichtige endogene Prozesse in den dort vorherrschenden kleinbäuerlichen Nutzungssystemen untersucht. Diese Prozesse umfassen die Aufteilung der Arbeitskraft, die landwirtschaftliche Produktion sowie Einkommens- und Ressourcendynamiken. Sie wurden in einem qualitativen dynamischen Modell erfasst, welches eine zyklische Trajektorie mit vier unterschiedlich problematischen Entwicklungszuständen ergab. Als besonders problematischer Aspekt verschärfte sich die Vulnerabilität in weiten Teilen des Untersuchungsgebietes durch die Übernutzung natürlicher Ressourcen und die Möglichkeit weiterer Verarmung. Die in Nordostbrasilien gezeigten Veränderungen sind dazu geeignet, groß angelegte Entwicklungsprogramme, wie zum Beispiel “Avança Brasil”, angemessen an lokale Gegebenheiten anzupassen. Insgesamt ermöglicht es die Kategorisierung einer begrenzten Anzahl typischer Muster und Veränderungen, die Vulnerabilität in Trockengebieten besser zu verstehen. Eine nachhaltige Entwicklung von Trockengebieten basierend auf der Minderung von Vulnerabilität kann durch musterspezifische Ansätze zusammen mit Hinweisen zu Veränderungen im Schweregrad und zur Übertragbarkeit erfolgreicher Anpassungsstrategien wirkungsvoll unterstützt werden. KW - Kausalstruktur KW - Archetyp KW - mehrfache Stressfaktoren KW - ländliche Entwicklung KW - räumlich explizit KW - Causal structure KW - archetype KW - multiple stress factors KW - rural development KW - spatially explicit Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-58097 ER - TY - JOUR A1 - Siegel, John Philipp T1 - Strategisches Managment Y1 - 2011 SN - 978-3-531- 17546-1 ER - TY - JOUR A1 - Sicard, Adrien A1 - Stacey, Nicola A1 - Hermann, Katrin A1 - Dessoly, Jimmy A1 - Neuffer, Barbara A1 - Bäurle, Isabel A1 - Lenhard, Michael T1 - Genetics, evolution, and adaptive significance of the selfing syndrome in the genus Capsella JF - The plant cell N2 - The change from outbreeding to selfing is one of the most frequent evolutionary transitions in flowering plants. It is often accompanied by characteristic morphological and functional changes to the flowers (the selfing syndrome), including reduced flower size and opening. Little is known about the developmental and genetic basis of the selfing syndrome, as well as its adaptive significance. Here, we address these issues using the two closely related species Capsella grandiflora (the ancestral outbreeder) and red shepherd's purse (Capsella rubella, the derived selfer). In C. rubella, petal size has been decreased by shortening the period of proliferative growth. Using interspecific recombinant inbred lines, we show that differences in petal size and flower opening between the two species each have a complex genetic basis involving allelic differences at multiple loci. An intraspecific cross within C. rubella suggests that flower size and opening have been decreased in the C. rubella lineage before its extensive geographical spread. Lastly, by generating plants that likely resemble the earliest ancestors of the C. rubella lineage, we provide evidence that evolution of the selfing syndrome was at least partly driven by selection for efficient self-pollination. Thus, our studies pave the way for a molecular dissection of selfing-syndrome evolution. Y1 - 2011 U6 - https://doi.org/10.1105/tpc.111.088237 SN - 1040-4651 VL - 23 IS - 9 SP - 3156 EP - 3171 PB - American Society of Plant Physiologists CY - Rockville ER - TY - JOUR A1 - Sicard, Adrien A1 - Lenhard, Michael T1 - The selfing syndrome a model for studying the genetic and evolutionary basis of morphological adaptation in plants JF - Annals of botany N2 - Background In angiosperm evolution, autogamously selfing lineages have been derived from outbreeding ancestors multiple times, and this transition is regarded as one of the most common evolutionary tendencies in flowering plants. In most cases, it is accompanied by a characteristic set of morphological and functional changes to the flowers, together termed the selfing syndrome. Two major areas that have changed during evolution of the selfing syndrome are sex allocation to male vs. female function and flower morphology, in particular flower (mainly petal) size and the distance between anthers and stigma. Scope A rich body of theoretical, taxonomic, ecological and genetic studies have addressed the evolutionary modification of these two trait complexes during or after the transition to selfing. Here, we review our current knowledge about the genetics and evolution of the selfing syndrome. Conclusions We argue that because of its frequent parallel evolution, the selfing syndrome represents an ideal model for addressing basic questions about morphological evolution and adaptation in flowering plants, but that realizing this potential will require the molecular identification of more of the causal genes underlying relevant trait variation. KW - Evolution KW - selfing syndrome KW - autogamy KW - pollen-to-ovule ratio KW - flower size KW - herkogamy KW - quantitative trait loci KW - self-incompatibility Y1 - 2011 U6 - https://doi.org/10.1093/aob/mcr023 SN - 0305-7364 SN - 1095-8290 VL - 107 IS - 9 SP - 1433 EP - 1443 PB - Oxford Univ. Press CY - Oxford ER - TY - JOUR A1 - Shu, Hua A1 - Zhou, Wei A1 - Yan, Ming A1 - Kliegl, Reinhold T1 - Font size modulates saccade-target selection in Chinese reading JF - Attention, perception, & psychophysics : AP&P ; a journal of the Psychonomic Society, Inc. N2 - In alphabetic writing systems, saccade amplitude (a close correlate of reading speed) is independent of font size, presumably because an increase in the angular size of letters is compensated for by a decrease of visual acuity with eccentricity. We propose that this invariance may (also) be due to the presence of spaces between words, guiding the eyes across a large range of font sizes. Here, we test whether saccade amplitude is also invariant against manipulations of font size during reading Chinese, a character-based writing system without spaces as explicit word boundaries for saccade-target selection. In contrast to word-spaced alphabetic writing systems, saccade amplitude decreased significantly with increased font size, leading to an increase in the number of fixations at the beginning of words and in the number of refixations. These results are consistent with a model which assumes that word beginning (rather than word center) is the default saccade target if the length of the parafoveal word is not available. KW - Eye movement KW - Saccade KW - Chinese KW - Font size Y1 - 2011 U6 - https://doi.org/10.3758/s13414-010-0029-y SN - 1943-3921 VL - 73 IS - 2 SP - 482 EP - 490 PB - Springer CY - New York ER - TY - JOUR A1 - Shu, Hua A1 - Zhou, Wei A1 - Yan, Ming T1 - Font size modulates saccade-target selection in Chinese reading N2 - In alphabetic writing systems, saccade amplitude (a close correlate of reading speed) is independent of font size, presumably because an increase in the angular size of letters is compensated for by a decrease of visual acuity with eccentricity. We propose that this invariance may (also) be due to the presence of spaces between words, guiding the eyes across a large range of font sizes. Here, we test whether saccade amplitude is also invariant against manipulations of font size during reading Chinese, a character-based writing system without spaces as explicit word boundaries for saccade-target selection. In contrast to word-spaced alphabetic writing systems, saccade amplitude decreased significantly with increased font size, leading to an increase in the number of fixations at the beginning of words and in the number of refixations. These results are consistent with a model which assumes that word beginning (rather than word center) is the default saccade target if the length of the parafoveal word is not available. Y1 - 2011 UR - http://www.springerlink.com/content/70r7748jj7107137/fulltext.html U6 - https://doi.org/10.3758/s13414-010-0029-y ER - TY - JOUR A1 - Shkilnyy, Andriy A1 - Schöne, Stefanie A1 - Rumplasch, Claudia A1 - Uhlmann, Annett A1 - Hedderich, Annett A1 - Günter, Christina A1 - Taubert, Andreas T1 - Calcium phosphate mineralization with linear poly(ethylene imine) a time-resolved study JF - Colloid and polymer science : official journal of the Kolloid-Gesellschaft N2 - We have earlier shown that linear poly(ethylene imine) (LPEI) is an efficient growth modifier for calcium phosphate mineralization from aqueous solution (Shkilnyy et al., Langmuir, 2008, 24 (5), 2102). The current study addresses the growth process and the reason why LPEI is such an effective additive. To that end, the solution pH and the calcium and phosphate concentrations were monitored vs. reaction time using potentiometric, complexometric, and photometric methods. The phase transformations in the precipitates and particle morphogenesis were analyzed by X-ray diffraction and transmission electron microscopy, respectively. All measurements reveal steep decreases of the pH, calcium, and phosphate concentrations along with a rapid precipitation of brushite nanoparticles early on in the reaction. Brushite transforms into hydroxyapatite (HAP) within the first 2 h, which is much faster than what is reported, for example, for calcium phosphate precipitated with poly(acrylic acid). We propose that poly(ethylene imine) acts as a proton acceptor (weak buffer), which accelerates the transformation from brushite to HAP by taking up the protons that are released from the calcium phosphate precipitate during the phase transformation. KW - Calcium phosphate KW - Polyethylene imine KW - Mineralization KW - Kinetics Y1 - 2011 U6 - https://doi.org/10.1007/s00396-011-2403-2 SN - 0303-402X VL - 289 IS - 8 SP - 881 EP - 888 PB - Springer CY - New York ER - TY - JOUR A1 - Shin, Seoleun A1 - Zöller, Gert A1 - Holschneider, Matthias A1 - Reich, Sebastian T1 - A multigrid solver for modeling complex interseismic stress fields JF - Computers & geosciences : an international journal devoted to the publication of papers on all aspects of geocomputation and to the distribution of computer programs and test data sets ; an official journal of the International Association for Mathematical Geology N2 - We develop a multigrid, multiple time stepping scheme to reduce computational efforts for calculating complex stress interactions in a strike-slip 2D planar fault for the simulation of seismicity. The key elements of the multilevel solver are separation of length scale, grid-coarsening, and hierarchy. In this study the complex stress interactions are split into two parts: the first with a small contribution is computed on a coarse level, and the rest for strong interactions is on a fine level. This partition leads to a significant reduction of the number of computations. The reduction of complexity is even enhanced by combining the multigrid with multiple time stepping. Computational efficiency is enhanced by a factor of 10 while retaining a reasonable accuracy, compared to the original full matrix-vortex multiplication. The accuracy of solution and computational efficiency depend on a given cut-off radius that splits multiplications into the two parts. The multigrid scheme is constructed in such a way that it conserves stress in the entire half-space. KW - Multigrid KW - Multiple time stepping KW - Strike-slip fault model Y1 - 2011 U6 - https://doi.org/10.1016/j.cageo.2010.11.011 SN - 0098-3004 VL - 37 IS - 8 SP - 1075 EP - 1082 PB - Elsevier CY - Oxford ER - TY - JOUR A1 - Shebalin, Peter A1 - Narteau, Clement A1 - Holschneider, Matthias A1 - Schorlemmer, Danijel T1 - Short-Term earthquake forecasting using early aftershock statistics JF - Bulletin of the Seismological Society of America N2 - We present an alarm-based earthquake forecast model that uses the early aftershock statistics (EAST). This model is based on the hypothesis that the time delay before the onset of the power-law aftershock decay rate decreases as the level of stress and the seismogenic potential increase. Here, we estimate this time delay from < t(g)>, the time constant of the Omori-Utsu law. To isolate space-time regions with a relative high level of stress, the single local variable of our forecast model is the E-a value, the ratio between the long-term and short-term estimations of < t(g)>. When and where the E-a value exceeds a given threshold (i.e., the c value is abnormally small), an alarm is issued, and an earthquake is expected to occur during the next time step. Retrospective tests show that the EAST model has better predictive power than a stationary reference model based on smoothed extrapolation of past seismicity. The official prospective test for California started on 1 July 2009 in the testing center of the Collaboratory for the Study of Earthquake Predictability (CSEP). During the first nine months, 44 M >= 4 earthquakes occurred in the testing area. For this time period, the EAST model has better predictive power than the reference model at a 1% level of significance. Because the EAST model has also a better predictive power than several time-varying clustering models tested in CSEP at a 1% level of significance, we suggest that our successful prospective results are not due only to the space-time clustering of aftershocks. Y1 - 2011 U6 - https://doi.org/10.1785/0120100119 SN - 0037-1106 VL - 101 IS - 1 SP - 297 EP - 312 PB - Seismological Society of America CY - El Cerrito ER - TY - JOUR A1 - Shayduk, Roman A1 - Navirian, Hengameh A1 - Leitenberger, Wolfram A1 - Goldshteyn, Jevgenij A1 - Vrejoiu, Ionela A1 - Weinelt, Martin A1 - Gaal, Peter A1 - Herzog, Marc A1 - von Korff Schmising, Clemens A1 - Bargheer, Matias T1 - Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction JF - New journal of physics : the open-access journal for physics N2 - We report on synchrotron-based high-repetition rate ultrafast x-ray diffraction (UXRD) experiments monitoring the transport of heat from an epitaxial La(0.7)Sr(0.3)MnO(3)/SrTiO(3) superlattice (SL) into the substrate on timescales from 100 ps to 4 mu s. Transient thermal lattice expansion was determined with an accuracy of 10(-7), corresponding to a sensitivity to temperature changes down to 0.01 K. We follow the heat flow within the SL and into the substrate after the impulsive laser heating leads to a small temperature rise of Delta T = 6 K. The transient lattice temperature can be simulated very well using the bulk heat conductivities. This contradicts the interpretation of previous UXRD measurements, which predicted a long-lasting expansion of SrRuO(3) for more than 200 ps. The disagreement could be resolved by assuming that the heat conductivity changes in the first hundred picoseconds. Y1 - 2011 U6 - https://doi.org/10.1088/1367-2630/13/9/093032 SN - 1367-2630 VL - 13 IS - 11 PB - IOP Publ. Ltd. CY - Bristol ER - TY - GEN A1 - Shaw, Jason A. A1 - Gafos, Adamantios I. A1 - Hoole, Philip A1 - Zeroual, Chakir T1 - Dynamic invariance in the phonetic expression of syllable structure BT - a case study of Moroccan Arabic consonant clusters T2 - Postprints der Universität Potsdam : Humanwissenschaftliche Reihe N2 - We asked whether invariant phonetic indices for syllable structure can be identified in a language where word-initial consonant clusters, regardless of their sonority profile, are claimed to be parsed heterosyllabically. Four speakers of Moroccan Arabic were recorded, using Electromagnetic Articulography. Pursuing previous work, we employed temporal diagnostics for syllable structure, consisting of static correspondences between any given phonological organisation and its presumed phonetic indices. We show that such correspondences offer only a partial understanding of the relation between syllabic organisation and continuous indices of that organisation. We analyse the failure of the diagnostics and put forth a new approach in which different phonological organisations prescribe different ways in which phonetic indices change as phonetic parameters are scaled. The main finding is that invariance is found in these patterns of change, rather than in static correspondences between phonological constructs and fixed values for their phonetic indices. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - 516 KW - american english KW - perception KW - speech KW - organization KW - duration KW - patterns KW - syllabication KW - articulation KW - sequences KW - knowledge Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-412479 SN - 1866-8364 IS - 516 SP - 455 EP - 490 ER - TY - THES A1 - Sharma, Tripti T1 - Regulation of potassium channels in plants : biophysical mechanisms and physiological implacations Y1 - 2011 CY - Potsdam ER - TY - JOUR A1 - Sharma, Reeta A1 - Stuckas, Heiko A1 - Bhaskar, Ranjana A1 - Khan, Imran A1 - Goyal, Surendra Prakash A1 - Tiedemann, Ralph T1 - Genetically distinct population of Bengal tiger (Panthera tigris tigris) in Terai Arc Landscape (TAL) of India JF - Mammalian biology = Zeitschrift für Säugetierkunde N2 - We analyzed mtDNA polymorphisms (a total of 741 bp from a part of conserved control region, ND5, ND2, Cyt b and 12S) in 91 scats and 12 tissue samples of Bengal tiger (Panthera tigris tigris) populations across Terai Arc Landscape (TAL) located at the foothills of Himalayas in North Western India, Buxa Tiger Reserve (BTR), and North East India. In TAL and BTR, we found a specific haplotype at high frequency, which was absent elsewhere, indicating a genetically distinct population in these regions. Within the TAL region, there is some evidence for genetic isolation of the tiger populations west of river Ganges, i.e., in the western part of Rajaji National Park (RNP). Although the river itself might not constitute a significant barrier for tigers, recent human-induced changes in habitat and degradation of the Motichur-Chilla Corridor connecting the two sides of the tiger habitat of RNP might effectively prevent genetic exchange. A cohesive population is observed for the rest of the TAL. Even the more eastern BTR belongs genetically to this unit, despite the present lack of a migration corridor between BTR and TAL. In spite of a close geographic proximity, Chitwan (Nepal) constitutes a tiger population genetically different from TAL. Moreover, it is observed that the North East India tiger populations are genetically different from TAL and BTR, as well as from the other Bengal tiger populations in India. KW - Bengal tiger KW - Population genetics KW - mtDNA haplotype KW - Terai Arc Y1 - 2011 U6 - https://doi.org/10.1016/j.mambio.2010.10.005 SN - 1616-5047 VL - 76 IS - 4 SP - 484 EP - 490 PB - Elsevier CY - Jena ER - TY - JOUR A1 - Sharkovska, Yuliya A1 - Kalk, Philipp A1 - von Websky, Karoline A1 - Relle, Katharina A1 - Pfab, Thiemo A1 - Alter, Markus L. A1 - Fischer, Yvan A1 - Hocher, Berthold T1 - Renoprotective effects of combined endothelin-converting enzyme/neutral endopeptidase inhibitor SLV338 in acute and chronic experimental renal damage JF - Clinical laboratory : the peer reviewed journal for clinical laboratories and laboratories related to blood transfusion N2 - Background: Acute kidney injury (AKI) as well as chronic renal failure are associated with a huge mortality/morbidity. However, so far no drugs have been approved for the treatment of acute kidney failure and only a few for the treatment of chronic kidney disease (CKD). We analysed the effect of SLV 338, a neutral endopeptidase (NEP)/endothelin converting enzyme (ECE)-inhibitor in animal models of acute kidney failure as well as chronic renal failure. Methods: Acute renal failure was induced in male Wistar rats by uninephrectomy and clamping of the remaining kidney for 55 minutes. SLV338 (total dose: 4.9 mg/kg) or vehicle was continuously infused for 2 hours (starting 20 minutes prior to clamping). Sham operated animals served as controls. Plasma creatinine was measured at baseline and day 2 and 8 after renal ischemia-reperfusion. Hypertensive renal damage was induced in male Sprague Dawley rats by nitric oxide deficiency using L-NAME (50 mg/kg per day, added to drinking water for 4 weeks). One group was treated over the same time period with SLV338 (30 mg/kg per day, mixed with food). Systolic blood pressure was monitored weekly. At study end, urine and blood samples were collected and kidneys were harvested. Results: Acute renal ischemia-reperfusion caused a 5-fold plasma creatinine elevation (day 2), which was significantly attenuated by more than 50 % in animals treated with SLV338 (p < 0.05). Renal failure was accompanied by a 67 % mortality in vehicle-treated rats, but only 20 % after SLV338 treatment (p = 0.03 compared to sham controls). Chronic L-NAME administration caused hypertension, urinary albumin excretion, glomerulosclerosis, renal arterial remodelling, and renal interstitial fibrosis. Treatment with SLV338 did not significantly affect blood pressure, but abolished renal tissue damage (interstitial fibrosis, glomerulosclerosis, renal arterial remodelling (p < 0.05 versus L-NAME group in each case). Conclusions: The dual ECE/NEP inhibitor SLV338 preserves kidney function and reduces mortality in severe acute ischemic renal failure. Moreover, combined ECE/NEP inhibition prevents hypertensive renal tissue damage in a blood pressure independent manner in L-NAME-treated rats. KW - Renal failure KW - endothelin-converting enzyme KW - neutral endopeptidase Y1 - 2011 SN - 1433-6510 VL - 57 IS - 7-8 SP - 507 EP - 515 PB - Clin Lab Publ., Verl. Klinisches Labor CY - Heidelberg ER - TY - JOUR A1 - Shainyan, Bagrat A. A1 - Suslova, Elena N. A1 - Kleinpeter, Erich T1 - Conformational analysis of N-phenyl- and N-trifyl-4,4-dimethyl-4-silathiane 1-sulfimides JF - Journal of physical organic chemistry N2 - N-Substituted 4,4-dimethyl-4-silathiane 1-sulfimides Me2Si(sic)S=NSO2R [R- Ph (1), CF3 (2)] were studied experimentally by variable temperature dynamic NMR spectroscopy. Low temperature 13 C NMR spectra of the two compounds revealed the frozen ring inversion process and approximately equal content of the axial and equatorial conformers. Calculations of the 4-silathiane derivatives 1, 2 and the model compound [R Me (3)] as well as their carbon analogs, the similarly N-substituted (sic)S=NSO2R thiane 1-sulfimides [R = Ph (4), CF3 (5), Me (6)] at the DFT/B3LYP/6-311G(d, p) level in the gas phase and in chloroform solution using the PCM model at the same level of theory showed a strong dependence of the relative stability of the conformer on the solvent. The electronegative trifluoromethyl group increases the relative stability of the axial conformer. KW - 4-silathianes KW - conformational analysis KW - dynamic NMR KW - quantum chemical calculations KW - sulfimides Y1 - 2011 U6 - https://doi.org/10.1002/poc.1811 SN - 0894-3230 VL - 24 IS - 8 SP - 698 EP - 704 PB - Wiley-Blackwell CY - Malden ER - TY - THES A1 - Seyfried, Markus T1 - Unabhängigkeit und Wirksamkeit von Landesrechnungshöfen : eine empirisch-vergleichende Bestandsaufnahme T2 - Interdisziplinäre Organisations- und Verwaltungsforschung Y1 - 2011 SN - 978-3-531-92799-2 U6 - https://doi.org/10.1007/978-3-531-92799-2 VL - 17 PB - VS Verlag für Sozialwissenschaften / Springer Fachmedien Wiesbaden GmbH Wiesbaden CY - Wiesbaden ER - TY - JOUR A1 - Sepp, T. A1 - Tempel, E. A1 - Gramann, M. A1 - Nurmi, P. A1 - Haupt, Michael T1 - Studying the patterns of the universe JF - Baltic astronomy N2 - The SDSS galaxy catalog is one of the best databases for galaxy distribution studies. The SDSS DR8 data is used to construct the galaxy cluster catalog. We construct the clusters from the calculated luminosity density field and identify denser regions. Around these peak regions we construct galaxy clusters. Another interesting question in cosmology is how observable galaxy structures are connected to underlying dark matter distribution. To study this we compare the SDSS DR7 galaxy group catalog with galaxy groups obtained from the semi-analytical Millennium N-Body simulation. Specifically, we compare the group richness, virial radius, maximum separation and velocity dispersion distributions and find a relatively good agreement between the mock catalog and observations. This strongly supports the idea, that the dark matter distribution and galaxies in the semi-analytical models and observations are very closely linked. KW - galaxies: groups, clusters KW - cosmology: dark matter, large-scale structure of the Universe Y1 - 2011 SN - 1392-0049 VL - 20 IS - 2 SP - 309 EP - 312 PB - Institute of Theoretical Physics and Astronomy CY - Moletai ER - TY - JOUR A1 - Sepe, Franco T1 - A conclusione degli eccetera Y1 - 2011 ER - TY - JOUR A1 - Senge, Mathias O. A1 - Ryppa, Claudia A1 - Fazekas, Marijana A1 - Zawadzka, Monika A1 - Dahms, Katja T1 - 5,10-A2B2-Type meso-Substituted PorphyrinsuA Unique Class of Porphyrins with a Realigned Dipole Moment JF - Chemistry - a European journal N2 - Current applications in porphyrin chemistry require the use of unsymmetrically substituted porphyrins. Many current industrial interests in optics and biomedicine require systems with either pushpull (electron-donating and -withdrawing groups) or amphiphilic systems (hydrophobic and hydrophilic groups). In this context we present the class of 5,10-A2B2-type porphyrins for which two different substituents are positioned in diagonally opposite meso positions. Thus, the intramolecular dipole moment in these tetrapyrroles is positioned along a beta-beta vector passing through two pyrrole rings. This is opposite to the situation of the frequently used 5,15-A2BC porphyrins for which the dipole moment is oriented along a mesomeso axis. We have elaborated syntheses of the 5,10-A2B2 porphyrins by using transition-metal-catalyzed transformations of 5,10-A2 porphyrins or direct substitutions reactions thereof; this gives the target molecules in 2277% overall yields. The compounds exhibit interesting structural, spectroscopic, and optical features and can serve as building blocks for new porphyrin arrays and applications. KW - macrocycles KW - nitrogen heterocycles KW - nonlinear optics KW - porphyrinoids KW - tetrapyrroles Y1 - 2011 U6 - https://doi.org/10.1002/chem.201101934 SN - 0947-6539 VL - 17 IS - 48 SP - 13562 EP - 13573 PB - Wiley-VCH CY - Weinheim ER - TY - JOUR A1 - Selting, Margret T1 - Prosodie und Einheitenkonstruktion in einem ethnischen Stil : Verwendung und Funktion von "Türkendeutsch" in Gesprächen Y1 - 2011 SN - 978-3-86956-091-5 ER - TY - JOUR A1 - Selting, Margret T1 - Prosody and unit-construction in an ethnic style : the case of Turkish German and its use and function in conversation Y1 - 2011 SN - 978-90-272-3488-9 ER - TY - JOUR A1 - Selting, Magret T1 - Prosodie und Einheitenkonstruktion in einem ethnischen Stil BT - Verwendung und Funktion von "Türkendeutsch" in Gesprächen JF - Mobilisierte Kulturen Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-53707 SN - 2192-3019 SN - 2192-3027 IS - 2 SP - 173 EP - 205 ER -