TY - BOOK A1 - Nienhaus, Marc A1 - Gooch, Bruce A1 - Döllner, Jürgen Roland Friedrich T1 - Visualizing movement dynamics in virtual urban environments N2 - Dynamics in urban environments encompasses complex processes and phenomena such as related to movement (e.g.,traffic, people) and development (e.g., construction, settlement). This paper presents novel methods for creating human-centric illustrative maps for visualizing the movement dynamics in virtual 3D environments. The methods allow a viewer to gain rapid insight into traffic density and flow. The illustrative maps represent vehicle behavior as light threads. Light threads are a familiar visual metaphor caused by moving light sources producing streaks in a long-exposure photograph. A vehicle’s front and rear lights produce light threads that convey its direction of motion as well as its velocity and acceleration. The accumulation of light threads allows a viewer to quickly perceive traffic flow and density. The light-thread technique is a key element to effective visualization systems for analytic reasoning, exploration, and monitoring of geospatial processes. T3 - Technische Berichte des Hasso-Plattner-Instituts für Digital Engineering an der Universität Potsdam - 17 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-33065 SN - 978-3-939469-52-0 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - JOUR A1 - Gandhimathi, V. M. A1 - Rajasekar, S. A1 - Kurths, Jürgen T1 - Vibrational and stochastic resonances in two coupled overdamped anharmonic oscillators JF - Modern physics letters : A, Particles and fields, gravitation, cosmology, nuclear physics N2 - We study the overdamped version of two coupled anharmonic oscillators under the influence of both low- and high-frequency forces respectively and a Gaussian noise term added to one of the two state variables of the system. The dynamics of the system is first studied in the presence of both forces separately without noise. In the presence of only one of the forces, no resonance behaviour is observed, however, hysteresis happens there. Then the influence of the high-frequency force in the presence of a low-frequency, i.e. biharmonic forcing, is studied. Vibrational resonance is found to occur when the amplitude of the high-frequency force is varied. The resonance curve resembles a stochastic resonance-like curve. It is maximum at the value of g at which the orbit lies in one well during one half of the drive cycle of the low-frequency force and in the other for the remaining half cycle. Vibrational resonance is characterized using the response amplitude and mean residence time. We show the occurrence of stochastic resonance behaviour in the overdamped system by replacing the high-frequency force by Gaussian noise. Similarities and differences between both types of resonance are presented. (c) 2006 Elsevier B.V. All rights reserved. KW - vibrational resonance KW - low-frequency force KW - high-frequency force KW - stochastic resonance KW - noise KW - mean residence time Y1 - 2006 U6 - https://doi.org/10.1016/j.physleta.2006.08.051 SN - 0375-9601 VL - 360 IS - 2 SP - 279 EP - 286 PB - Elsevier CY - Amsterdam ER - TY - GEN A1 - Bielawski, Martina A1 - Jurišić, J. A1 - Lenz, T. A1 - Maxian Rusche, T. A1 - Nippert, C. T1 - Via : communis Europa ; Europe's architecture in 2020 N2 - Forum: EU-Diplomatie im Jahre 2020 KW - Europäische Union KW - Europaidentität KW - Außenpolitik KW - Verteidigungspolitik KW - European Union KW - European identity KW - foreign policy KW - defence policy Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-48454 ER - TY - CHAP A1 - Bergmann, Kirsten A1 - Kopp, Stefan T1 - Verbal or visual? : How information is distributed across speech and gesture in spatial dialog N2 - In spatial dialog like in direction giving humans make frequent use of speechaccompanying gestures. Some gestures convey largely the same information as speech while others complement speech. This paper reports a study on how speakers distribute meaning across speech and gesture, and depending on what factors. Utterance meaning and the wider dialog context were tested by statistically analyzing a corpus of direction-giving dialogs. Problems of speech production (as indicated by discourse markers and disfluencies), the communicative goals, and the information status were found to be influential, while feedback signals by the addressee do not have any influence. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10375 ER - TY - JOUR A1 - Steuer, Ralf A1 - Humburg, Peter A1 - Selbig, Joachim T1 - Validation and functional annotation of expression-based clusters based on gene ontology JF - BMC bioinformatics N2 - Background: The biological interpretation of large-scale gene expression data is one of the paramount challenges in current bioinformatics. In particular, placing the results in the context of other available functional genomics data, such as existing bio-ontologies, has already provided substantial improvement for detecting and categorizing genes of interest. One common approach is to look for functional annotations that are significantly enriched within a group or cluster of genes, as compared to a reference group. Results: In this work, we suggest the information-theoretic concept of mutual information to investigate the relationship between groups of genes, as given by data-driven clustering, and their respective functional categories. Drawing upon related approaches (Gibbons and Roth, Genome Research 12: 1574-1581, 2002), we seek to quantify to what extent individual attributes are sufficient to characterize a given group or cluster of genes. Conclusion: We show that the mutual information provides a systematic framework to assess the relationship between groups or clusters of genes and their functional annotations in a quantitative way. Within this framework, the mutual information allows us to address and incorporate several important issues, such as the interdependence of functional annotations and combinatorial combinations of attributes. It thus supplements and extends the conventional search for overrepresented attributes within a group or cluster of genes. In particular taking combinations of attributes into account, the mutual information opens the way to uncover specific functional descriptions of a group of genes or clustering result. All datasets and functional annotations used in this study are publicly available. All scripts used in the analysis are provided as additional files. Y1 - 2006 U6 - https://doi.org/10.1186/1471-2105-7-380 SN - 1471-2105 VL - 7 IS - 380 PB - BioMed Central CY - London ER - TY - JOUR A1 - Kamjunke, Norbert A1 - Bohn, Christiane A1 - Grey, John T1 - Utilisation of dissolved organic carbon from different sources by pelagic bacteria in an acidic mining lake N2 - We compared growth rates and efficiencies of pelagic bacteria from an extremely acidic mining lake (pH 2.6, mean depth 4.6m) supplied with different sources of carbon: (1) excreted by phytoplankton, (2) derived from benthic algae, (3) entering the lake via ground water, and (4) leached from leaf litter. Bacteria exhibited high growth rate and efficiency on exudates of pelagic and benthic algae. In contrast, they showed a lower growth rate and efficiency with organic carbon from ground water, and grew at a very high rate but a very low efficiency on leaf leachate. Results from stable isotope analyses indicate a greater importance of benthic exudates and leaf leachate for bacteria in the epilimnion, and a higher impact of ground water sources in the hypolimnion. Given the magnitude of differential source inputs into the lake, we suggest that benthic primary production was the most important carbon source for pelagic bacteria. The benthic-pelagic coupling seems to be more relevant in this shallow acidic lake with low pelagic carbon dioxide concentrations than in neutral lakes Y1 - 2006 UR - http://www.schweizerbart.de/j/archiv-hydrobiologie/ U6 - https://doi.org/10.1127/0003-9136/2006/0165-0355 SN - 0003-9136 ER - TY - JOUR A1 - Kamunke, Norbert A1 - Bohn, Christiane T1 - Utilisation of dissolved organic carbon from different sources by pelagic bacteria in an acidic mining lake Y1 - 2006 ER - TY - JOUR A1 - Bookhagen, Bodo A1 - Echtler, Helmut Peter A1 - Melnick, Daniel A1 - Strecker, Manfred A1 - Spencer, Joel Q. G. T1 - Using uplifted Holocene beach berms for paleoseismic analysis on the Santa Maria Island, south-central Chile N2 - Major earthquakes ( M > 8) have repeatedly ruptured the Nazca-South America plate interface of south-central Chile involving meter scale land-level changes. Earthquake recurrence intervals, however, extending beyond limited historical records are virtually unknown, but would provide crucial data on the tectonic behavior of forearcs. We analyzed the spatiotemporal pattern of Holocene earthquakes on Santa Maria Island (SMI; 37 degrees S), located 20 km off the Chilean coast and approximately 70 km east of the trench. SMI hosts a minimum of 21 uplifted beach berms, of which a subset were dated to calculate a mean uplift rate of 2.3 +/- 0.2 m/ky and a tilting rate of 0.022 +/- 0.002 degrees/ky. The inferred recurrence interval of strandline-forming earthquakes is similar to 180 years. Combining coseismic uplift and aseismic subsidence during an earthquake cycle, the net gain in strandline elevation in this environment is similar to 0.4 m per event Y1 - 2006 UR - http://www.agu.org/journals/gl/ U6 - https://doi.org/10.1029/2006gl026734 SN - 0094-8276 ER - TY - CHAP A1 - Doktor, Daniel A1 - Badeck, Franz-Werner A1 - Bondeau, Alberte A1 - Koslowsky, Dirk A1 - Schaber, Jörg A1 - McAllister, Murdock T1 - Using satellite imagery and ground observations to quantify the effect of intra-annually changing temperature patterns on spring time phenology N2 - Interdisziplinäres Zentrum für Musterdynamik und Angewandte Fernerkundung Workshop vom 9. - 10. Februar 2006 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-7244 N1 - [Poster] ER - TY - JOUR A1 - Gerhard, Reimund A1 - Faria, Roberto M. A1 - Oliveira Jr., O. N. A1 - Giacometti, Jose A. T1 - Useful effects of space charge and dipole polarization: Recent developments in polymer electrets and organic semiconductors (Editorial) Y1 - 2006 UR - http://ieeexplore.ieee.org/servlet/opac?punumber=94 U6 - https://doi.org/10.1109/TDEI.2006.247817 SN - 1070-9878 ER - TY - JOUR A1 - Eccard, Jana A1 - Dean, W. Richard J. A1 - Wichmann, Matthias A1 - Huttunen, S. M A1 - Eskelinen, Eeva-Liisa A1 - Moloney, Kirk A. A1 - Jeltsch, Florian T1 - Use of large Acacia trees by the cavity dwelling Black-tailed Tree Rat in the southern Kalahari N2 - Recent extensive harvesting of large, often dead Acacia trees in and savanna of southern Africa is cause for concern about the conservation status of the arid savanna and its animal community. We mapped vegetation and nests of the Black-tailed Tree Rat Thallomy's nigricauda to assess the extent to which the rats depend on particular tree species and on the existence of dead, standing trees. The study was conducted in continuous Acacia woodland on the southern and eastern edge of the Kalahari, South Africa. Trees in which there were tree rat nests were compared with trees of similar size and vigour to identify the characteristics of nest sites. Spatial analysis of tree rat distribution was conducted using Ripley's-L function. We found that T nigricauda was able to utilize all available tree species, as long as trees were large and old enough so that cavities were existing inside the stem. The spatial distribution of nest trees did not show clumping at the investigated scale, and we therefore reject the notion of the rats forming colonies when inhabiting continuous woodlands. The selection of a particular tree as a nest site was furthermore depending on the close proximity of the major food plant, Acacia mellifera. This may limit the choice of suitable nest sites. since A. mellifera was less likely to grow within a vegetation patch containing a large trees than in patches without large trees. Y1 - 2006 UR - http://www.sciencedirect.com/science/journal/01401963 U6 - https://doi.org/10.1016/j.jaridenv.2005.06.019 SN - 0140-1963 ER - TY - JOUR A1 - Baptista, Murilo da Silva A1 - Pereira, Tiago A1 - Kurths, Jürgen T1 - Upper bounds in phase synchronous weak coherent chaotic attractors N2 - An approach is presented for coupled chaotic systems with weak coherent motion, from which we estimate the upper bound value for the absolute phase difference in phase synchronous states. This approach shows that synchronicity in phase implies synchronicity in the time of events, a characteristic explored to derive an equation to detect phase synchronization, based on the absolute difference between the time of these events. We demonstrate the potential use of this approach for the phase coherent and the funnel attractor of the Rossler system, as well as for the spiking/bursting Rulkov map. Y1 - 2006 UR - http://www.sciencedirect.com/science/journal/01672789 U6 - https://doi.org/10.1016/j.physd.2006.02.007 SN - 0167-2789 ER - TY - THES A1 - Vockenberg, Kerstin T1 - Updating of representations in working memory T1 - Aktualisierung von Arbeitsgedächtnisrepräsentationen N2 - The limited capacity of working memory forces people to update its contents continuously. Two aspects of the updating process were investigated in the present experimental series. The first series concerned the question if it is possible to update several representations in parallel. Similar results were obtained for the updating of object features as well as for the updating of whole objects, participants were able to update representations in parallel. The second experimental series addressed the question if working memory representations which were replaced in an updating disappear directly or interfere with the new representations. Evidence for the existence of old representations was found under working memory conditions and under conditions exceeding working memory capacity. These results contradict the hypothesis that working memory contents are protected from proactive interference of long-term memory contents. N2 - Aufgrund der begrenzten Kapazität des Arbeitsgedächtnisses müssen seine Inhalte ständig aktualisiert werden. Zwei Aspekte des Aktualisierungsprozesses wurden in Experimentalserien untersucht. Die erste Serie betraf die Frage, ob es möglich ist, mehrere Repräsentationen gleichzeitig zu aktualisieren. Ähnliche Ergebnisse ergaben sich sowohl für das Aktualisieren von Objektmerkmalen als auch für das Aktualisieren von ganzen Objekten, die Versuchsteilnehmer konnten Repräsentationen gleichzeitig aktualisieren. In der zweiten Experimentalserie wurde die Frage untersucht, ob Arbeitsgedächtnisrepräsentationen, die bei einer Aktualisierung ersetzt worden sind, sofort verschwinden oder mit den neuen Repräsentationen interferieren. Evidenz für das Vorhandensein alter Repräsentationen wurde unter Arbeitsgedächtnisbedingungen und unter Bedingungen, bei denen die Arbeitsgedächtniskapazität überschritten wird, gefunden. Diese Ergebnisse widersprechen der Hypothese, dass Arbeitsgedächtnisinhalte vor proaktiver Interferenz aus dem Langzeitgedächtnis geschützt sind. KW - Aktualisierung KW - Arbeitsgedächtnis KW - proaktive Interferenz KW - parallele Aktualisierung KW - updating KW - working memory KW - proactive interference KW - parallel updating Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-11767 ER - TY - JOUR A1 - VanderVen, Peter F. M. A1 - Ehler, Elisabeth A1 - Vakeel, Padmanabhan A1 - Eulitz, Stefan A1 - Schenk, Jörg A. A1 - Milting, Hendrik A1 - Micheel, Burkhard A1 - Fürst, Dieter Oswald T1 - Unusual splicing events result in distinct Xin isoforms that associate differentially with filamin c and Mena/ VASP N2 - Filamin c is the predominantly expressed filamin isoform in striated muscles. It is localized in myofibrillar Z- discs, where it binds FATZ and myotilin, and in myotendinous junctions and intercalated discs. Here, we identify Xin, the protein encoded by the human gene 'cardiomyopathy associated 1' (CMYA1) as filamin c binding partner at these specialized structures where the ends of myofibrils are attached to the sarcolemma. Xin directly binds the EVH1 domain proteins Mena and VASP. In the adult heart, Xin and Mena/VASP colocalize with filamin c in intercalated discs. In cultured cardiomyocytes, the proteins also localize in the nonstriated part of myofibrils, where sarcomeres are assembled and an extensive reorganization of the actin cytoskeleton occurs. Unusual intraexonic splicing events result in the existence of three Xin isoforms that associate differentially with its ligands. The identification of the complex filamin c-Xin-Mena/VASP provides a first glance on the role of Xin in the molecular mechanisms involved in developmental and adaptive remodeling of the actin cytoskeleton during cardiac morphogenesis and sarcomere assembly. (c) 2006 Elsevier Inc. All rights reserved Y1 - 2006 U6 - https://doi.org/10.1016/j.yexcr.2006.03.015 ER - TY - JOUR A1 - Diez, Isabel A1 - Tauer, Klaus A1 - Schulz, Burkhard T1 - Unusual polymer dispersions-polypyrrole suspensions made of rings, frames, and platelets JF - Colloid and polymer science : official journal of the Kolloid-Gesellschaft N2 - Experimental results show that the polymerization of pyrrole in the presence of beta-naphthalenesulfonic acid and different fluorosurfactants like perfluorooctanesulfonic acid, perfluorooctyldiethanolamide, and ammonium perfluorooctanoate leads to polypyrrole with special morphologies, such as rings or disks and rectangular frames or plates. The formation of these unusually shaped particles of polymer dispersions is explained by the chemical and colloidal peculiarities of the oxidative pyrrole polymerization with ammonium peroxodisulfate in aqueous medium. KW - polypyrrole KW - chemical oxidative polymerization KW - particle morphology Y1 - 2006 U6 - https://doi.org/10.1007/s00396-006-1521-8 SN - 0303-402X VL - 284 SP - 1431 EP - 1442 PB - Springer CY - New York ER - TY - JOUR A1 - Zhou, Changsong A1 - Motter, Adilson E. A1 - Kurths, Jürgen T1 - Universality in the synchronization of weighted random networks N2 - Realistic networks display not only a complex topological structure, but also a heterogeneous distribution of weights in the connection strengths. Here we study synchronization in weighted complex networks and show that the synchronizability of random networks with a large minimum degree is determined by two leading parameters: the mean degree and the heterogeneity of the distribution of node's intensity, where the intensity of a node, defined as the total strength of input connections, is a natural combination of topology and weights. Our results provide a possibility for the control of synchronization in complex networks by the manipulation of a few parameters Y1 - 2006 UR - http://prl.aps.org/pdf/PRL/v96/i3/e034101 U6 - https://doi.org/10.1103/Physrevlett.96.034101 ER - TY - JOUR A1 - Schmidt, Bernd A1 - Staude, Lucia T1 - Unexpected transfer hydrogenation of C-C-double bonds during Tandem-RCM-isomerization reactions JF - Journal of organometallic chemistry N2 - Unexpected hydrogen transfer from 2-propanol to C-C-double bonds has been observed in the course of a Tandem RCM-isomerization reaction leading to sterically congested spirocycles. KW - ruthenium KW - metathesis KW - isomerization KW - hydrogenation KW - transferhydrogenation KW - tandem sequence Y1 - 2006 U6 - https://doi.org/10.1016/j.jorganchem.2006.07.011 SN - 0022-328X VL - 691 IS - 24-25 SP - 5218 EP - 5221 PB - Elsevier CY - Lausanne ER - TY - CHAP A1 - Dzikovska, Myroslava O. A1 - Callaway, Charles B. A1 - Stone, Matthew A1 - Moore, Johanna D. T1 - Understanding student input for tutorial dialogue in procedural domains N2 - We present an analysis of student language input in a corpus of tutoring dialogue in the domain of symbolic differentiation. Our focus on procedural tutoring makes the dialogue comparable to collaborative problem-solving (CPS). Existing CPS models describe the process of negotiating plans and goals, which also fits procedural tutoring. However, we provide a classification of student utterances and corpus annotation which shows that approximately 28% of non-trivial student language in this corpus is not accounted for by existing models, and addresses other functions, such as evaluating past actions or correcting mistakes. Our analysis can be used as a foundation for improving models of tutoring dialogue. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10193 ER - TY - JOUR A1 - Hoie, Lars H. A1 - Sjoholm, Ake A1 - Guldstrand, Marie A1 - Zunft, Hans-Joachim Franz A1 - Lueder, Wolfgang A1 - Graubaum, Hans-Joachim A1 - Grünwald, Jörg T1 - Ultra heat treatment destroys cholesterol-lowering effect of soy protein JF - International journal of food sciences and nutrition N2 - A randomized, placebo-controlled, double-blind clinical study was performed to investigate the dose-dependent response of serum cholesterol after consuming an ultra-heat-treated milk containing a soy protein preparation. Eighty hypercholesterolemic subjects were assigned to one of four study groups receiving 12.5 or 25 g soy protein (active treatment) or casein (placebo) daily over a period of 4 weeks. The trial substances were provided as ready-made, ultra-heated milk preparations. Before and after the treatment, serum concentrations of total, low-density lipoprotein, and high-density lipoprotein cholesterol were determined. Unexpectedly, at the end of the study, low-density lipoprotein cholesterol concentrations were significantly increased compared with baseline in all study groups. The magnitude of this increase (17 - 19%) was similar in all active and placebo study groups. Soy protein supplements previously shown to be effective in reducing serum cholesterol had in this study no such lipid-lowering effect after ultra heat treatment. KW - soy KW - protein KW - cholesterol KW - ultra heat treatment Y1 - 2006 U6 - https://doi.org/10.1080/09637480601009059 SN - 0963-7486 VL - 57 SP - 512 EP - 519 PB - Taylor & Francis CY - Abingdon ER - TY - JOUR A1 - O'Brien, Patrick J. T1 - Type-locality granulites: high-pressure rocks formed at eclogite-facies conditions N2 - The type-locality granulites from the Granulitgebirge of Saxony, Germany, are rocks of broadly granitic composition containing minor garnet and kyanite within a commonly mylonitised matrix of feldspars and quartz. Petrographic evidence indicates a primary assemblage of ternary feldspar + quartz + garnet + kyanite + rutile, most likely resulting from partial melting of a granitic protolith, for which equilibrium temperature and pressure conditions of > 1000 degrees C and > 1.5 GPa have been deduced. These extreme (for crustal rocks) conditions, and the inferred peak assemblage, are supported by the newly-developed Zr-in-rutile geothermometer and experimental studies on the same bulk composition, respectively. As these conditions lie above those required for plagioclase stability in quartz tholeiites, they are thus in the eclogite facies. Widespread modification of the peak assemblage, for example mesoperthite formation after ternary feldspar, deformation-induced recrystallisation of perthites to two-feldspar + quartz aggregates, biotite replacing garnet, Ca-loss at garnet rims, sillimanite replacing kyanite or secondary garnet growth, makes reliable interpretation of equilibrium assemblages and compositions very difficult and explains the spread of published pressure- temperature values and consequent confusion about formation depths and the validity of tectonometamorphic models. Such extreme metamorphic conditions in rock compositions typical for the upper continental crust, reflecting a hot subduction environment, has important consequences for understanding some collisional orogens Y1 - 2006 UR - http://www.springerlink.com/content/105515 U6 - https://doi.org/10.1007/s00710-005-0108-2 ER - TY - JOUR A1 - Yenesew, Abiy A1 - Kiplagat, John T. A1 - Derese, Solomon A1 - Midiwo, Jacob O. A1 - Kabaru, Jacques M. A1 - Heydenreich, Matthias A1 - Peter, Martin G. T1 - Two unusual rotenoid derivatives, 7a-O-methyl-12a-hydroxydeguelol and spiro-13-homo-13-oxaelliptone, from the seeds of Derris trifoliata N2 - The crude methanol extract of the seeds of Derris trifoliata showed potent and dose dependent larvicidal activity against the 2nd instar larvae of Aedes aegypti. From this extract two unusual rotenoid derivatives, a rotenoloid (named 7a-O-methyl-12a-hydroxydeguelol) and a spirohomooxarotenoid (named spiro-13-homo-13-oxaelliptone), were isolated and characterised. In addition a rare natural chromanone (6,7-dimethoxy-4-chromanone) and the known rotenoids rotenone, tephrosin and dehydrodeguelin were identified. The structures were assigned on the basis of spectroscopic evidence. The larvicidal activity of the crude extract is mainly due to rotenone. (c) 2006 Elsevier Ltd. All rights reserved Y1 - 2006 UR - http://www.sciencedirect.com/science/article/pii/S0031942206000045 U6 - https://doi.org/10.1016/j.phytochem.2006.01.002 ER - TY - GEN A1 - Thiel, Marco A1 - Romano, Maria Carmen A1 - Kurths, Jürgen A1 - Rolfs, Martin T1 - Twin Surrogates to Test for Complex Synchronisation N2 - We present an approach to generate (multivariate) twin surrogates (TS) based on recurrence properties. This technique generates surrogates which correspond to an independent copy of the underlying system, i. e. they induce a trajectory of the underlying system starting at different initial conditions. We show that these surrogates are well suited to test for complex synchronisation and exemplify this for the paradigmatic system of R¨ossler oscillators. The proposed test enables to assess the statistical relevance of a synchronisation analysis from passive experiments which are typical in natural systems. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 264 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57231 ER - TY - JOUR A1 - Thiel, Marco A1 - Romano, Maria Carmen A1 - Kurths, Jürgen A1 - Rolfs, Martin A1 - Kliegl, Reinhold T1 - Twin surrogates to test for complex synchronisation N2 - We present an approach to generate (multivariate) twin surrogates (TS) based on recurrence properties. This technique generates surrogates which correspond to an independent copy of the underlying system, i.e. they induce a trajectory of the underlying system starting at different initial conditions. We show that these surrogates are well suited to test for complex synchronisation and exemplify this for the paradigmatic system of Rossler oscillators. The proposed test enables to assess the statistical relevance of a synchronisation analysis from passive experiments which are typical in natural systems Y1 - 2006 UR - http://www.mendeley.com/research/twin-surrogates-to-test-for-complex-synchronisation/#page-1 U6 - https://doi.org/10.1209/epl/i2006-10147-0 ER - TY - JOUR A1 - Evans, Nicholas R. A1 - Devi, Lekshmi Sudha A1 - Mak, Chris S. K. A1 - Watkins, Scott E. A1 - Pascu, Sofia I. A1 - Köhler, Anna A1 - Friend, Richard H. A1 - Williams, Charlotte K. A1 - Holmes, Andrew B. T1 - Triplet energy back transfer in conjugated polymers with pendant phosphorescent iridium complexes N2 - The nature of Dexter triplet energy transfer between bonded systems of a red phosphorescent iridium complex 13 and a conjugated polymer, polyfluorene, has been investigated in electrophosphorescent organic light-emitting diodes. Red- emitting phosphorescent iridium complexes based on the [Ir(btp)2(acac)]fragment (where btp is 2-(2 '- benzo[b]thienyl)pyridinato and acac is acetylacetonate) have been attached either directly (spacerless) or through a - (CH2)(8)-chain (octamethylene-tethered) at the 9-position of a 9-octylfluorene host. The resulting dibromo- functionalized spacerless (8) or octamethylene-tethered (12) fluorene monomers were chain extended by Suzuki polycondensations using the bis(boronate)-terminated fluorene macromonomers 16 in the presence of end-capping chlorobenzene solvent to produce the statistical spacerless (17) and octamethylene-tethered ( 18) copolymers containing an even dispersion of the pendant phosphorescent fragments. The spacerless monomer 12 adopts a face-to-face conformation with a separation of only 3.6 angstrom between the iridium complex and fluorenyl group, as shown by X-ray analysis of a single crystal, and this facilitates intramolecular triplet energy transfer in the spacerless copolymers 17. The photo- and electroluminescence efficiencies of the octamethylene-tethered copolymers 18 are double those of the spacerless copolymers 17, and this is consistent with suppression of the back transfer of triplets from the red phosphorescent iridium complex to the polyfluorene backbone in 18. The incorporation of a -(CH2)(8)- chain between the polymer host and phosphorescent guest is thus an important design principle for achieving higher efficiencies in those electrophosphorescent organic light-emitting diodes for which the triplet energy levels of the host and guest are similar Y1 - 2006 UR - http://pubs.acs.org/journal/jacsat U6 - https://doi.org/10.1021/Ja0584267 SN - 0002-7863 ER - TY - JOUR A1 - Lotz, Anja A1 - Kinder, Annette T1 - Transfer in artificial grammar learning : the role of repetition information N2 - In this article, the authors report 2 experiments that investigated the sources of information used in transfer and nontransfer tasks in artificial grammar learning. Multiple regression analyses indicated that 2 types of information about repeating elements were crucial for performance in both tasks: information about the repetition of adjacent elements and information about repetition of elements in the whole item. Similarity of test items to specific training items and chunk information influenced participants' judgments only in nontransfer tasks Y1 - 2006 UR - http://www.apa.org/pubs/journals/xlm/ U6 - https://doi.org/10.1037/0278-7393.32.4.707 SN - 0278-7393 ER - TY - GEN A1 - Kliegl, Reinhold A1 - Nuthmann, Antje A1 - Engbert, Ralf T1 - Tracking the Mind During Reading: The Influence of Past, Present, and Future Words on Fixation Durations N2 - Reading requires the orchestration of visual, attentional, language-related, and oculomotor processing constraints. This study replicates previous effects of frequency, predictability, and length of fixated words on fixation durations in natural reading and demonstrates new effects of these variables related to previous and next words. Results are based on fixation durations recorded from 222 persons, each reading 144 sentences. Such evidence for distributed processing of words across fixation durations challenges psycholinguistic immediacy-of-processing and eye-mind assumptions. Most of the time the mind processes several words in parallel at different perceptual and cognitive levels. Eye movements can help to unravel these processes. T3 - Zweitveröffentlichungen der Universität Potsdam : Humanwissenschaftliche Reihe - paper 263 KW - eye movements KW - fixation duration KW - gaze KW - word recognition KW - reading Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57225 ER - TY - JOUR A1 - Kliegl, Reinhold A1 - Nuthmann, Antje A1 - Engbert, Ralf T1 - Tracking the mind during reading : the influence of past, present, and future words on fixation durations N2 - Reading requires the orchestration of visual, attentional, language-related, and oculomotor processing constraints. This study replicates previous effects of frequency, predictability, and length of fixated words on fixation durations in natural reading and demonstrates new effects of these variables related to previous and next words. Results are based on fixation durations recorded from 222 persons, each reading 144 sentences. Such evidence for distributed processing of words across fixation durations challenges psycholinguistic immediacy-of-processing and eye- mind assumptions. Most of the time the mind processes several words in parallel at different perceptual and cognitive levels. Eye movements can help to unravel these processes Y1 - 2006 UR - http://psycnet.apa.org/index.cfm?fa=browsePA.volumes&jcode=xge&vol=135&issue=1 U6 - https://doi.org/10.1037/0096-3445.135.1.12 SN - 0096-3445 ER - TY - JOUR A1 - Nagel, Birgit A1 - Warsinke, Axel T1 - Towards separation-free electrochemical affinity sensors by using antibodies, aptamers and molecularly imprinted polymers : a review Y1 - 2006 U6 - https://doi.org/10.1080/00032710600853903 ER - TY - CHAP A1 - Pfleger, Norbert A1 - Alexandersson, Jan T1 - Towards resolving referring expressions by implicitly activated referents in practical dialogue systems N2 - We present an extension to a comprehensive context model that has been successfully employed in a number of practical conversational dialogue systems. The model supports the task of multimodal fusion as well as that of reference resolution in a uniform manner. Our extension consists of integrating implicitly mentioned concepts into the context model and we show how they serve as candidates for reference resolution. Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-10187 ER - TY - JOUR A1 - Couper-Kuhlen, Elizabeth A1 - Selting, Margret T1 - Towards an interactional perspective on prosody and a prosodic perspective on interaction Y1 - 2006 ER - TY - JOUR A1 - Shenoy, Pradeep A1 - Krauledat, Matthias A1 - Blankertz, Benjamin A1 - Rao, Rajesh P. N. A1 - Müller, Klaus-Robert T1 - Towards adaptive classification for BCI N2 - Non-stationarities are ubiquitous in EEG signals. They are especially apparent in the use of EEG-based brain- computer interfaces (BCIs): (a) in the differences between the initial calibration measurement and the online operation of a BCI, or (b) caused by changes in the subject's brain processes during an experiment (e.g. due to fatigue, change of task involvement, etc). In this paper, we quantify for the first time such systematic evidence of statistical differences in data recorded during offline and online sessions. Furthermore, we propose novel techniques of investigating and visualizing data distributions, which are particularly useful for the analysis of (non-) stationarities. Our study shows that the brain signals used for control can change substantially from the offline calibration sessions to online control, and also within a single session. In addition to this general characterization of the signals, we propose several adaptive classification schemes and study their performance on data recorded during online experiments. An encouraging result of our study is that surprisingly simple adaptive methods in combination with an offline feature selection scheme can significantly increase BCI performance Y1 - 2006 UR - http://iopscience.iop.org/1741-2552/3/1/R02/ U6 - https://doi.org/10.1088/1741-2560/3/1/R02 ER - TY - JOUR A1 - Wessel, Niels A1 - Schirdewan, Alexander T1 - Toward a prediction of sudden death in propofol-related infusion syndrome Y1 - 2006 ER - TY - JOUR A1 - Montbrio, Ernest A1 - Pazo, Diego A1 - Schmidt, Jürgen T1 - Time delay in the Kuramoto model with bimodal frequency distribution JF - Physical review : E, Statistical, nonlinear and soft matter physics N2 - We investigate the effects of a time-delayed all-to-all coupling scheme in a large population of oscillators with natural frequencies following a bimodal distribution. The regions of parameter space corresponding to synchronized and incoherent solutions are obtained both numerically and analytically for particular frequency distributions. In particular, we find that bimodality introduces a new time scale that results in a quasiperiodic disposition of the regions of incoherence. Y1 - 2006 U6 - https://doi.org/10.1103/PhysRevE.74.056201 SN - 1539-3755 VL - 74 PB - APS CY - College Park ER - TY - JOUR A1 - Germer, Sonja A1 - Elsenbeer, Helmut A1 - de Moraes, Jorge M. T1 - Throughfall and temporal trends of rainfall redistribution in an open tropical rainforest, south-western Amazonia (Rondônia, Brazil) Y1 - 2006 UR - http://www.hydrology-and-earth-system-sciences.net/index.html U6 - https://doi.org/10.5194/hess-10-383-2006 SN - 1027-5606 ER - TY - JOUR A1 - Mohsen, Ayman A1 - Kind, Rainer A1 - Sobolev, Stephan Vladimir A1 - Weber, Michael T1 - Thickness of the lithosphere east of the Dead Sea Transform JF - Geophysical journal international N2 - We use the S receiver function method to study the lithosphere at the Dead Sea Transform (DST). A temporary network of 22 seismic broad-band stations was operated on both sides of the DST from 2000 to 2001 as part of the DESERT project. We also used data from six additional permanent broad-band seismic stations at the DST and in the surrounding area, that is, in Turkey, Saudi Arabia, Egypt and Cyprus. Clear S-to-P converted phases from the crust-mantle boundary (Moho) and a deeper discontinuity, which we interpret as lithosphere-asthenosphere boundary (LAB) have been observed. The Moho depth (30-38 km) obtained from S receiver functions agrees well with the results from P receiver functions and other geophysical data. We observe thinning of the lithosphere on the eastern side of the DST from 80 km in the north of the Dead Sea to about 65 km at the Gulf of Aqaba. On the western side of the DST, the few data indicate a thin LAB of about 65 km. For comparison, we found a 90-km-thick lithosphere in eastern Turkey and a 160-km-thick lithosphere under the Arabian shield, respectively. These observations support previous suggestions, based on xenolith data, heat flow observations, regional uplift history and geodynamic modelling, that the lithosphere around DST has been significantly thinned in the Late Cenozoic, likely following rifting and spreading of the Red Sea. KW - Dead Sea Transform KW - S receiver functions KW - thickness of the lithosphere Y1 - 2006 U6 - https://doi.org/10.1111/j.1365-246X.2006.03185.x SN - 0956-540X SN - 1365-246X VL - 167 IS - 2 SP - 845 EP - 852 PB - Blackwell CY - Oxford ER - TY - THES A1 - Bellin, Ingo T1 - Thermosensitive Polymer Networks with Two Different Shapes in Memory Y1 - 2006 CY - Potsdam ER - TY - JOUR A1 - Ostermeyer, Martin A1 - Mudge, Damien A1 - Veitch, Peter John A1 - Munch, Jesper T1 - Thermally induced birefringence in Nd : YAG slab lasers N2 - We study thermally induced birefringence in crystalline Nd:YAG zigzag slab lasers and the associated depolarization losses. The optimum crystallographic orientation of the zigzag slab within the Nd:YAG boule and photoelastic effects in crystalline Nd:YAG slabs are briefly discussed. The depolarization is evaluated using the temperature and stress distributions, calculated using a finite element model, for realistically pumped and cooled slabs of finite dimensions. Jones matrices are then used to calculate the depolarization of the zigzag laser mode. We compare the predictions with measurements of depolarization, and suggest useful criteria for the design of the gain media for such lasers. Y1 - 2006 UR - http://www.opticsinfobase.org/ U6 - https://doi.org/10.1364/AO.45.005368 ER - TY - JOUR A1 - Flores Suárez, Rosaura A1 - Mellinger, Axel A1 - Wegener, Michael A1 - Wirges, Werner A1 - Gerhard, Reimund A1 - Singh, Rajeev T1 - Thermal-pulse tomography of polarization distributions in a cylindrical geometry JF - IEEE transactions on dielectrics and electrical insulation N2 - Fast, three-dimensional polarization mapping in piezoelectric sensor cables was performed by means of the novel thermal-pulse tomography (TPT) technique with a lateral resolution of 200 mum. The active piezoelectric cable material (a copolymer of polyvinylidene fluoride with trifluoroethylene) was electrically poled with a point-to-cable corona discharge. A focused laser was employed to heat the opaque outer electrode, and the short-circuit current generated by the thermal pulse was used to obtain 3D polarization maps via the scale transformation method. The article describes the TPT technique as a fast non-destructive option for studying cylindrical geometries. Y1 - 2006 U6 - https://doi.org/10.1109/TDEI.2006.258210 SN - 1070-9878 VL - 13 IS - 5 SP - 1030 EP - 1035 PB - IEEE CY - Piscataway ER - TY - JOUR A1 - Mellinger, Axel A1 - Wegener, Michael A1 - Wirges, Werner A1 - Mallepally, Rajendar Reddy A1 - Gerhard, Reimund T1 - Thermal and temporal stability of ferroelectret films made from cellular polypropylene/air composites N2 - Ferroelectrets are thin films of polymer foams, exhibiting piezoelectric properties after electrical charging. Ferroelectret foams usually consist of a cellular polymer structure filled with air. Polymer-air composites are elastically soft due to their high air content as well as due to the size and shape of the polymer walls. Their elastically soft composite structure is one essential key for the working principle of ferroelectrets, besides the permanent trapping of electric charges inside the polymer voids. The elastic properties allow large deformations of the electrically charged voids. However, the composite structure can also possibly limit the stability and consequently the range of applications because of, e. g., penetration of gas and liquids accompanied by discharge phenomena or because of a mechanical pre-load which may be required during the application. Here, we discuss various stability aspects related to the piezoelectric properties of polypropylene ferroelectrets. Near and below room temperature, the piezoelectric effect and the stability of the trapped charges are practically independent from humidity during long-time storage in a humid atmosphere or water, or from operating conditions, such as continuous mechanical excitation. Thermal treatment of cellular polypropylene above -10 degrees C leads to a softening of the voided structure which is apparent from the decreasing values of the elastic modulus. This decrease results in an increase of the piezoelectric activity. Heating above 60 degrees C, however, leads to a decrease in piezoelectricity Y1 - 2006 ER - TY - JOUR A1 - Mellinger, Axel A1 - Wegener, Michael A1 - Wirges, Werner A1 - Mallepally, Rajendar Reddy A1 - Gerhard, Reimund T1 - Thermal and temporal stability of ferroelectret films made from cellular polypropylene/air composites Y1 - 2006 ER - TY - JOUR A1 - Andrianov, Ivan A1 - Saalfrank, Peter T1 - Theoretical study of vibration-phonon coupling of H adsorbed on a Si(100) surface N2 - In this paper a perturbation-theory study of vibrational lifetimes for the bending and stretching modes of hydrogen adsorbed on a Si(100) surface is presented. The hydrogen-silicon interaction is treated with a semiempirical bond-order potential. Calculations are performed for H-Si clusters of different sizes. The finite lifetime is due to vibration-phonon coupling, which is assumed to be linear or bilinear in the phonon and nonlinear in the H-Si stretching and bending modes. Lifetimes and vibrational transition rates are evaluated with one- and two-phonon processes taken into account. Temperature effects are also discussed. In agreement with the experiment and previous theoretical treatment it is found that the H-Si (upsilon(s)=1) stretching vibration decays on a nanosecond timescale, whereas for the H-Si (upsilon(b)=1) bending mode a picosecond decay is predicted. For higher-excited vibrations, simple scaling laws are found if the excitation energies are not too large. The relaxation mechanisms for the excited H-Si stretching and the H-Si bending modes are analyzed in detail. Y1 - 2006 UR - http://jcp.aip.org/ U6 - https://doi.org/10.1063/1.2161191 SN - 0021-9606 ER - TY - JOUR A1 - Charron, Eric A1 - Cirone, M. A. A1 - Negretti, Antonio A1 - Schmiedmayer, Jörg A1 - Calarco, Tommaso T1 - Theoretical analysis of a realistic atom-chip quantum gate N2 - We present a detailed, realistic analysis of the implementation of a proposal for a quantum phase gate based on atomic vibrational states, specializing it to neutral rubidium atoms on atom chips. We show how to create a double-well potential with static currents on the atom chips, using for all relevant parameters values that are achieved with present technology. The potential barrier between the two wells can be modified by varying the currents in order to realize a quantum phase gate for qubit states encoded in the atomic external degree of freedom. The gate performance is analyzed through numerical simulations; the operation time is similar to 10 ms with a performance fidelity above 99.9%. For storage of the state between the operations the qubit state can be transferred efficiently via Raman transitions to two hyperfine states, where its decoherence is strongly inhibited. In addition we discuss the limits imposed by the proximity of the surface to the gate fidelity. Y1 - 2006 UR - http://pra.aps.org/ SN - 1050-2947 ER - TY - JOUR A1 - Harutyunyan, Gohar A1 - Schulze, Bert-Wolfgang T1 - The Zaremba problem with singular interfaces as a corner boundary value problem JF - Potential analysis : an international journal devoted to the interactions between potential theory, probability theory, geometry and functional analysis N2 - We study mixed boundary value problems for an elliptic operator A on a manifold X with boundary Y, i.e., Au = f in int X, T (+/-) u = g(+/-) on int Y+/-, where Y is subdivided into subsets Y+/- with an interface Z and boundary conditions T+/- on Y+/- that are Shapiro-Lopatinskij elliptic up to Z from the respective sides. We assume that Z subset of Y is a manifold with conical singularity v. As an example we consider the Zaremba problem, where A is the Laplacian and T- Dirichlet, T+ Neumann conditions. The problem is treated as a corner boundary value problem near v which is the new point and the main difficulty in this paper. Outside v the problem belongs to the edge calculus as is shown in Bull. Sci. Math. ( to appear). With a mixed problem we associate Fredholm operators in weighted corner Sobolev spaces with double weights, under suitable edge conditions along Z {v} of trace and potential type. We construct parametrices within the calculus and establish the regularity of solutions. KW - Zaremba problem KW - corner Sobolev spaces with double weights KW - pseudo-differential boundary value problems Y1 - 2006 U6 - https://doi.org/10.1007/s11118-006-9020-6 SN - 0926-2601 VL - 25 SP - 327 EP - 369 PB - Springer CY - Dordrecht ER - TY - JOUR A1 - Hazan, Valerie A1 - Sennema, Anke A1 - Faulkner, Andrew A1 - Ortega-Llebaria, Marta A1 - Iba, Midori A1 - Chung, Hyunsong T1 - The use of visual cues in the perception of non-native consonant contrasts N2 - This study assessed the extent to which second-language learners are sensitive to phonetic information contained in visual cues when identifying a non-native phonemic contrast. In experiment 1, Spanish and Japanese learners of English were tested on their perception of a labial/labiodental consonant contrast in audio (A), visual (V), and audio-visual (AV) modalities. Spanish students showed better performance overall, and much greater sensitivity to visual cues than Japanese students. Both learner groups achieved higher scores in the A V than in the A test condition, thus showing evidence of audio-visual benefit. Experiment 2 examined the perception of the less visually-salient /1/-/r/ contrast in Japanese and Korean learners of English. Korean learners obtained much higher scores in auditory and audio- visual conditions than in the visual condition, while Japanese learners generally performed poorly in both modalities. Neither. group showed evidence of audio-visual benefit. These results show the impact of the language background of the learner and visual salience of the contrast on the use of visual cues for a non-native contrast. Significant correlations between scores in the auditory and visual conditions suggest that increasing auditory proficiency in identifying a non-native contrast is linked with an increasing proficiency in using visual cues to the contrast. Y1 - 2006 UR - http://scitation.aip.org/jasa/ U6 - https://doi.org/10.1121/1.2166611 SN - 0001-4966 ER - TY - JOUR A1 - Leiterer, York A1 - Leitenberger, Wolfram A1 - Emmerling, Franziska A1 - Thünemann, Andreas F. A1 - Panne, Ulrich T1 - The use of an acoustic levitator to follow crystallization in small droplets by energydispersive X-ray diffraction Y1 - 2006 UR - http://journals.iucr.org/j/issues/2006/05/00/wf5016/wf5016.pdf U6 - https://doi.org/10.1107/S0021889806024915 SN - 0021-8898 ER - TY - JOUR A1 - Strohe, Hans Gerhard A1 - Achsani, Noer Azam T1 - The transmission of economic fluctuations between Russia, Europe, Asia and North America Y1 - 2006 SN - 3-540-24183-3 ER - TY - JOUR A1 - Thomas, Rainer A1 - Webster, J. D. A1 - Rhede, Dieter A1 - Seifert, W. A1 - Rickers, Karen A1 - Förster, Hans-Jürgen A1 - Heinrich, Wilhelm A1 - Davidson, P. T1 - The transition from peraluminous to peralkaline granitic melts: Evidence from melt inclusions and accessory minerals JF - Lithos : an international journal of mineralogy, petrology, and geochemistry N2 - Fractional crystallization of peraluminous F- and H(2)O-rich granite magmas progressively enriches the remaining melt with volatiles. We show that, at saturation, the melt may separate into two immiscible conjugate melt fractions, one of the fractions shows increasing peraluminosity and the other increasing peralkalinity. These melt fractions also fractionate the incompatible elements to significantly different degrees. Coexisting melt fractions have differing chemical and physical properties and, due to their high density and viscosity contrasts, they will tend to separate readily from each other. Once separated, each melt fraction evolves independently in response to changing T/P/X conditions and further immiscibility events may occur, each generating its own conjugate pair of melt fractions. The strongly peralkaline melt fractions in particular are very reactive and commonly react until equilibrium is attained. Consequently, the peralkaline melt fraction is commonly preserved only in the isolated melt and mineral inclusions. We demonstrate that the differences between melt fractions that can be seen most clearly in differing melt inclusion compositions are also visible in the composition of the resulting ore-forming and accessory minerals, and are visible on scales from a few micrometers to hundreds of meters. KW - granite melts KW - magma evolution KW - melt inclusions KW - melt-melt immiscibility KW - peraluminosity KW - peralkalinity KW - accessory minerals Y1 - 2006 U6 - https://doi.org/10.1016/j.lithos.2006.03.013 SN - 0024-4937 VL - 91 IS - 1-4 SP - 137 EP - 149 PB - Elsevier CY - Amsterdam ER - TY - BOOK A1 - Schulze, Bert-Wolfgang T1 - The structure of operators on manifolds with polyhedral singularities T3 - Preprint / Universität Potsdam, Institut für Mathematik, Arbeitsgruppe Partiell Y1 - 2006 SN - 1437-739X PB - Univ. CY - Potsdam ER - TY - INPR A1 - Schulze, Bert-Wolfgang T1 - The structure of operators on manifolds with polyhedral singularities N2 - We discuss intuitive ideas and historical background of concepts in the analysis on configurations with singularities, here in connection with our iterative approach for higher singularities. T3 - Preprint - (2006) 05 Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-30099 ER - TY - JOUR A1 - Vogel, Ralf T1 - The simple generator JF - Linguistics in Potsdam N2 - I argue that the shift of explanatory burden from the generator to the evaluator in OT syntax – together with the difficulties that arise when we try to formulate a working theory of the interfaces of syntax – leads to a number of assumptions about syntactic structures in OT which are quite different from those typical of minimalist syntax: formal features, as driving forces behind syntactic movement, are useless, and derivational and representational economy are problematic for both empirical and conceptual reasons. The notion of markedness, central in Optimality Theory, is not fully compatible with the idea of synactic economy. Even more so, seemingly obvious cases of blocking by structural economy do not seem to result from grammar proper, but reflect (economical) aspects of language use. KW - OT syntax KW - generator KW - markedness KW - syntax-semantics interface KW - syntax-phonology interface Y1 - 2006 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-32338 SN - 1616-7392 SN - 1864-1857 IS - 25 SP - 99 EP - 136 ER -