@article{AliuArlenAuneetal.2011,
  author    = {Aliu, E. and Arlen, T. and Aune, T. and Beilicke, M. and Benbow, W. and Boettcher, Markus and Bouvier, A. and Bradbury, S. M. and Buckley, J. H. and Bugaev, V. and Cannon, A. and Cesarini, A. and Ciupik, L. and Collins-Hughes, E. and Connolly, M. P. and Cui, W. and Dickherber, R. and Errando, M. and Falcone, A. and Finley, J. P. and Fortson, L. and Furniss, A. and Galante, N. and Gall, D. and Gillanders, G. H. and Godambe, S. and Griffin, S. and Grube, J. and Gyuk, G. and Hanna, D. and Holder, J. and Huan, H. and Hughes, G. and Hui, C. M. and Humensky, T. B. and Kaaret, P. and Karlsson, N. and Kertzman, M. and Kieda, D. and Krawczynski, H. and Krennrich, F. and Madhavan, A. S. and Maier, G. and Majumdar, P. and McArthur, S. and McCann, A. and Moriarty, P. and Mukherjee, R. and Ong, R. A. and Orr, M. and Otte, A. N. and Park, N. and Perkins, J. S. and Pichel, A. and Pohl, Martin and Prokoph, H. and Quinn, J. and Ragan, K. and Reyes, L. C. and Reynolds, P. T. and Roache, E. and Rose, H. J. and Ruppel, J. and Saxon, D. B. and Schroedter, M. and Sembroski, G. H. and Skole, C. and Smith, A. W. and Staszak, D. and Tesic, G. and Theiling, M. and Thibadeau, S. and Tsurusaki, K. and Tyler, J. and Varlotta, A. and Vincent, S. and Vivier, M. and Wakely, S. P. and Ward, J. E. and Weinstein, A. and Weisgarber, T. and Williams, D. A.},
  title     = {Veritas observations of unusual extragalactic transient swift J164449.3+573451},
  series = {The astrophysical journal : an international review of spectroscopy and astronomical physics ; Part 2, Letters},
  volume    = {738},
  journal   = {The astrophysical journal : an international review of spectroscopy and astronomical physics ; Part 2, Letters},
  number    = {2},
  publisher = {IOP Publ. Ltd.},
  address   = {Bristol},
  issn      = {2041-8205},
  doi       = {10.1088/2041-8205/738/2/L30},
  pages     = {5},
  year      = {2011},
  abstract  = {We report on very high energy (>100 GeV) gamma-ray observations of Swift J164449.3+573451, an unusual transient object first detected by the Swift Observatory and later detected by multiple radio, optical, and X-ray observatories. A total exposure of 28 hr was obtained on Swift J164449.3+573451 with the Very Energetic Radiation Imaging Telescope Array System ( VERITAS) during 2011 March 28-April 15. We do not detect the source and place a differential upper limit on the emission at 500 GeV during these observations of 1.4 x 10(-12) erg cm(-2) s(-1) (99\% confidence level). We also present time-resolved upper limits and use a flux limit averaged over the X-ray flaring period to constrain various emission scenarios that can accommodate both the radio-through-X-ray emission detected from the source and the lack of detection by VERITAS.},
  language  = {en}
}
@unpublished{RosamondBardohlDiehletal.2011,
  author    = {Rosamond, Frances and Bardohl, Roswitha and Diehl, Stephan and Geisler, Uwe and Bolduan, Gordon and Lessmoellmann, Annette and Schwill, Andreas and Stege, Ulrike},
  title     = {Virtual extension reaching out to the media become a computer science ambassador},
  series = {Communications of the ACM / Association for Computing Machinery},
  volume    = {54},
  journal   = {Communications of the ACM / Association for Computing Machinery},
  number    = {3},
  publisher = {Association for Computing Machinery},
  address   = {New York},
  issn      = {0001-0782},
  doi       = {10.1145/1897852.1897880},
  pages     = {113 -- 116},
  year      = {2011},
  language  = {en}
}
@article{LaueAwad2011,
  author    = {Laue, Ralf and Awad, Ahmed Mahmoud Hany Aly},
  title     = {Visual suggestions for improvements in business process diagrams},
  series = {Journal of visual languages and computing},
  volume    = {22},
  journal   = {Journal of visual languages and computing},
  number    = {5},
  publisher = {Elsevier},
  address   = {London},
  issn      = {1045-926X},
  doi       = {10.1016/j.jvlc.2011.04.003},
  pages     = {385 -- 399},
  year      = {2011},
  abstract  = {Business processes are commonly modeled using a graphical modeling language. The most widespread notation for this purpose is business process diagrams in the Business Process Modeling Notation (BPMN). In this article, we use the visual query language BPMN-Q for expressing patterns that are related to possible problems in such business process diagrams. We discuss two classes of problems that can be found frequently in real-world models: sequence flow errors and model fragments that can make the model difficult to understand. By using a query processor, a business process modeler is able to identify possible errors in business process diagrams. Moreover, the erroneous parts of the business process diagram can be highlighted when an instance of an error pattern is found. This way, the modeler gets an easy-to-understand feedback in the visual modeling language he or she is familiar with. This is an advantage over current validation methods, which usually lack this kind of intuitive feedback.},
  language  = {en}
}
@article{RolfsOhl2011,
  author    = {Rolfs, Martin and Ohl, Sven},
  title     = {Visual suppression in the superior colliculus around the time of microsaccades},
  series = {Journal of neurophysiology},
  volume    = {105},
  journal   = {Journal of neurophysiology},
  number    = {1},
  publisher = {American Chemical Society},
  address   = {Bethesda},
  issn      = {0022-3077},
  doi       = {10.1152/jn.00862.2010},
  pages     = {1 -- 3},
  year      = {2011},
  abstract  = {Miniature eye movements jitter the retinal image unceasingly, raising the question of how perceptual continuity is achieved during visual fixation. Recent work discovered suppression of visual bursts in the superior colliculus around the time of microsaccades, tiny jerks of the eyes that support visual perception while gaze is fixed. This finding suggests that corollary discharge, supporting visual stability when rapid eye movements drastically shift the retinal image, may also exist for the smallest saccades.},
  language  = {en}
}
@article{AwadWeidlichWeske2011,
  author    = {Awad, Ahmed Mahmoud Hany Aly and Weidlich, Matthias and Weske, Mathias},
  title     = {Visually specifying compliance rules and explaining their violations for business processes},
  series = {Journal of visual languages and computing},
  volume    = {22},
  journal   = {Journal of visual languages and computing},
  number    = {1},
  publisher = {Elsevier},
  address   = {London},
  issn      = {1045-926X},
  doi       = {10.1016/j.jvlc.2010.11.002},
  pages     = {30 -- 55},
  year      = {2011},
  abstract  = {A business process is a set of steps designed to be executed in a certain order to achieve a business value. Such processes are often driven by and documented using process models. Nowadays, process models are also applied to drive process execution. Thus, correctness of business process models is a must. Much of the work has been devoted to check general, domain-independent correctness criteria, such as soundness. However, business processes must also adhere to and show compliance with various regulations and constraints, the so-called compliance requirements. These are domain-dependent requirements. In many situations, verifying compliance on a model level is of great value, since violations can be resolved in an early stage prior to execution. However, this calls for using formal verification techniques, e.g., model checking, that are too complex for business experts to apply. In this paper, we utilize a visual language. BPMN-Q to express compliance requirements visually in a way similar to that used by business experts to build process models. Still, using a pattern based approach, each BPMN-Qgraph has a formal temporal logic expression in computational tree logic (CTL). Moreover, the user is able to express constraints, i.e., compliance rules, regarding control flow and data flow aspects. In order to provide valuable feedback to a user in case of violations, we depend on temporal logic querying approaches as well as BPMN-Q to visually highlight paths in a process model whose execution causes violations.},
  language  = {en}
}
@article{HenzeRailaKempfetal.2011,
  author    = {Henze, Andrea and Raila, Jens and Kempf, Caroline and Reinke, Petra and Sefrin, Anett and Querfeld, Uwe and Schweigert, Florian J.},
  title     = {Vitamin A metabolism is changed in donors after living-kidney transplantation an observational study},
  series = {Lipids in health and disease},
  volume    = {10},
  journal   = {Lipids in health and disease},
  number    = {23},
  publisher = {BioMed Central},
  address   = {London},
  issn      = {1476-511X},
  doi       = {10.1186/1476-511X-10-231},
  pages     = {7},
  year      = {2011},
  abstract  = {Background: The kidneys are essential for the metabolism of vitamin A (retinol) and its transport proteins retinol-binding protein 4 (RBP4) and transthyretin. Little is known about changes in serum concentration after living donor kidney transplantation (LDKT) as a consequence of unilateral nephrectomy; although an association of these parameters with the risk of cardiovascular diseases and insulin resistance has been suggested. Therefore we analyzed the concentration of retinol, RBP4, apoRBP4 and transthyretin in serum of 20 living-kidney donors and respective recipients at baseline as well as 6 weeks and 6 months after LDKT. Results: As a consequence of LDKT, the kidney function of recipients was improved while the kidney function of donors was moderately reduced within 6 weeks after LDKT. With regard to vitamin A metabolism, the recipients revealed higher levels of retinol, RBP4, transthyretin and apoRBP4 before LDKT in comparison to donors. After LDKT, the levels of all four parameters decreased in serum of the recipients, while retinol, RBP4 as well as apoRBP4 serum levels of donors increased and remained increased during the follow-up period of 6 months. Conclusion: LDKT is generally regarded as beneficial for allograft recipients and not particularly detrimental for the donors. However, it could be demonstrated in this study that a moderate reduction of kidney function by unilateral nephrectomy, resulted in an imbalance of components of vitamin A metabolism with a significant increase of retinol and RBP4 and apoRBP4 concentration in serum of donors.},
  language  = {en}
}
@book{Farias2011,
  author    = {Farias, Fidel},
  title     = {Volatility transmission between the oil market and the financial market},
  series = {Forschungsbericht},
  volume    = {0111},
  journal   = {Forschungsbericht},
  publisher = {Inst. f{\"u}r Makro{\"o}konomik},
  address   = {Potsdam},
  isbn      = {978-3-9812422-8-7},
  pages     = {110 S.},
  year      = {2011},
  language  = {en}
}
@article{KolloscheDoeringStumpeetal.2011,
  author    = {Kollosche, Matthias and D{\"o}ring, Sebastian and Stumpe, Joachim and Kofod, Guggi},
  title     = {Voltage-controlled compression for period tuning of optical surface relief gratings},
  series = {OPTICS LETTERS},
  volume    = {36},
  journal   = {OPTICS LETTERS},
  number    = {8},
  publisher = {OPTICAL SOC AMER},
  address   = {WASHINGTON},
  issn      = {0146-9592},
  pages     = {1389 -- 1391},
  year      = {2011},
  abstract  = {This Letter reports on new methods and a consistent model for voltage tunable optical transmission gratings. Elastomeric gratings were molded from holographically written surface relief gratings in an azobenzene sol-gel material. These were placed on top of a transparent electroactive elastomeric substrate. Two different electro-active substrate elastomers were employed, with a large range of prestretches. A novel finite-deformation theory was found to match the device response excellently, without fitting parameters. The results clearly show that the grating underwent pure-shear deformation, and more surprisingly, that the mechanical properties of the electro-active substrate did not affect device actuation. (C) 2011 Optical Society of America},
  language  = {en}
}
@misc{Priewe2011,
  author    = {Priewe, Marc},
  title     = {Walter W. Woodward, Prospero´s America: John Winthrop, Jr., Alchemy, and the Creation of New England Culture, 1606-1676 / [rezensiert von] Marc Priewe},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-93713},
  pages     = {199 -- 200},
  year      = {2011},
  abstract  = {Rezensiertes Werk: Walter W. Woodward: Prospero's America: John Winthrop, Jr., Alchemy, and the Creation of New England Culture, 1606-1676. Chapel Hill: University of North Carolina Press, 2010. Hb. 336pp. ISBN 978-0-8078-3301-8.},
  language  = {en}
}
@article{PanetKuroishiHolschneider2011,
  author    = {Panet, Isabelle and Kuroishi, Yuki and Holschneider, Matthias},
  title     = {Wavelet modelling of the gravity field by domain decomposition methods: an example over Japan},
  series = {Geophysical journal international},
  volume    = {184},
  journal   = {Geophysical journal international},
  number    = {1},
  publisher = {Oxford Univ. Press},
  address   = {Oxford},
  issn      = {0956-540X},
  doi       = {10.1111/j.1365-246X.2010.04840.x},
  pages     = {203 -- 219},
  year      = {2011},
  abstract  = {With the advent of satellite gravity, large gravity data sets of unprecedented quality at low and medium resolution become available. For local, high resolution field modelling, they need to be combined with the surface gravity data. Such models are then used for various applications, from the study of the Earth interior to the determination of oceanic currents. Here we show how to realize such a combination in a flexible way using spherical wavelets and applying a domain decomposition approach. This iterative method, based on the Schwarz algorithms, allows to split a large problem into smaller ones, and avoids the calculation of the entire normal system, which may be huge if high resolution is sought over wide areas. A subdomain is defined as the harmonic space spanned by a subset of the wavelet family. Based on the localization properties of the wavelets in space and frequency, we define hierarchical subdomains of wavelets at different scales. On each scale, blocks of subdomains are defined by using a tailored spatial splitting of the area. The data weighting and regularization are iteratively adjusted for the subdomains, which allows to handle heterogeneity in the data quality or the gravity variations. Different levels of approximations of the subdomains normals are also introduced, corresponding to building local averages of the data at different resolution levels. We first provide the theoretical background on domain decomposition methods. Then, we validate the method with synthetic data, considering two kinds of noise: white noise and coloured noise. We then apply the method to data over Japan, where we combine a satellite-based geopotential model, EIGEN-GL04S, and a local gravity model from a combination of land and marine gravity data and an altimetry-derived marine gravity model. A hybrid spherical harmonics/wavelet model of the geoid is obtained at about 15 km resolution and a corrector grid for the surface model is derived.},
  language  = {en}
}
@misc{TodtPenaZuehlkeetal.2011,
  author    = {Todt, Helge Tobias and Pe{\~n}a, Miriam and Z{\"u}hlke, Julia and Oskinova, Lida and Hamann, Wolf-Rainer and Gr{\"a}fener, G{\"o}tz},
  title     = {Weak emission line central stars of planetary nebulae},
  series = {Planetary Nebulae: an Eye to the Future},
  journal   = {Planetary Nebulae: an Eye to the Future},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-413775},
  pages     = {2},
  year      = {2011},
  abstract  = {To understand the evolution and morphology of planetary nebulae, a detailed knowledge of their central stars is required. Central stars that exhibit emission lines in their spectra, indicating stellar mass-loss allow to study the evolution of planetary nebulae in action. Emission line central stars constitute about 10 \% of all central stars. Half of them are practically hydrogen-free Wolf-Rayet type central stars of the carbon sequence, [WC], that show strong emission lines of carbon and oxygen in their spectra. In this contribution we address the weak emission-lines central stars (wels). These stars are poorly analyzed and their hydrogen content is mostly unknown. We obtained optical spectra, that include the important Balmer lines of hydrogen, for four weak emission line central stars. We present the results of our analysis, provide spectral classification and discuss possible explanations for their formation and evolution.},
  language  = {en}
}
@book{OPUS4-5707,
  title     = {Web-based development in the lively kernel},
  editor    = {Lincke, Jens and Hirschfeld, Robert},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-160-8},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-55605},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {I, 55},
  year      = {2011},
  abstract  = {The World Wide Web as an application platform becomes increasingly important. However, the development of Web applications is often more complex than for the desktop. Web-based development environments like Lively Webwerkstatt can mitigate this problem by making the development process more interactive and direct. By moving the development environment into the Web, applications can be developed collaboratively in a Wiki-like manner. This report documents the results of the project seminar on Web-based Development Environments 2010. In this seminar, participants extended the Web-based development environment Lively Webwerkstatt. They worked in small teams on current research topics from the field of Web-development and tool support for programmers and implemented their results in the Webwerkstatt environment.},
  language  = {en}
}
@article{Martens2011,
  author    = {Martens, D{\"o}rte},
  title     = {Well-being and acceptance - contradictory aims in forest management?},
  series = {Eco.mont : journal on protected mountain areas research},
  volume    = {3},
  journal   = {Eco.mont : journal on protected mountain areas research},
  number    = {2},
  publisher = {Austrian Academy of Sciences Press},
  address   = {Wien},
  issn      = {2073-106X},
  pages     = {63 -- 65},
  year      = {2011},
  abstract  = {Urban forests fulfil various functions, among them the restoration process and aesthetical needs of urban residents. This article reflects the attitudes towards different managed forests on the one hand and their influence on psychological well-being on the other. Results of empirical approaches from both fields show some inconsistency, suggesting that people have a more positive attitude towards wild forest areas, while the effect on well-being is more positive after a walk in tended forest areas. A discussion follows on the link between perception and the effect of urban forests. An outlook on necessary research reveals the need for longitudinal research. The article concludes by showing management implications.},
  language  = {en}
}
@article{GlatzelLaschewskyLutz2011,
  author    = {Glatzel, Stefan and Laschewsky, Andr{\´e} and Lutz, Jean-Francois},
  title     = {Well-Defined uncharged polymers with a sharp UCST in water and in physiological milieu},
  series = {Macromolecules : a publication of the American Chemical Society},
  volume    = {44},
  journal   = {Macromolecules : a publication of the American Chemical Society},
  number    = {2},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {0024-9297},
  doi       = {10.1021/ma102677k},
  pages     = {413 -- 415},
  year      = {2011},
  language  = {en}
}
@phdthesis{CamaraMattosMartins2011,
  author    = {Camara Mattos Martins, Marina},
  title     = {What are the downstream targets of trehalose-6-phosphate signalling in plants?},
  address   = {Potsdam},
  pages     = {164 S.},
  year      = {2011},
  language  = {en}
}
@article{vonderMalsburgVasishth2011,
  author    = {von der Malsburg, Titus Raban and Vasishth, Shravan},
  title     = {What is the scanpath signature of syntactic reanalysis?},
  series = {Journal of memory and language},
  volume    = {65},
  journal   = {Journal of memory and language},
  number    = {2},
  publisher = {Elsevier},
  address   = {San Diego},
  issn      = {0749-596X},
  doi       = {10.1016/j.jml.2011.02.004},
  pages     = {109 -- 127},
  year      = {2011},
  abstract  = {Which repair strategy does the language system deploy when it gets garden-pathed, and what can regressive eye movements in reading tell us about reanalysis strategies? Several influential eye-tracking studies on syntactic reanalysis (Frazier \& Rayner, 1982; Meseguer, Carreiras, \& Clifton, 2002; Mitchell, Shen, Green, \& Hodgson, 2008) have addressed this question by examining scanpaths, i.e., sequential patterns of eye fixations. However, in the absence of a suitable method for analyzing scanpaths, these studies relied on simplified dependent measures that are arguably ambiguous and hard to interpret. We address the theoretical question of repair strategy by developing a new method that quantifies scanpath similarity. Our method reveals several distinct fixation strategies associated with reanalysis that went undetected in a previously published data set (Meseguer et al., 2002). One prevalent pattern suggests re-parsing of the sentence, a strategy that has been discussed in the literature (Frazier \& Rayner, 1982); however, readers differed tremendously in how they orchestrated the various fixation strategies. Our results suggest that the human parsing system non-deterministically adopts different strategies when confronted with the disambiguating material in garden-path sentences.},
  language  = {en}
}
@article{Manovich2011,
  author    = {Manovich, Lev},
  title     = {What is visualization?},
  series = {DIGAREC Series},
  journal   = {DIGAREC Series},
  number    = {6},
  issn      = {1867-6219},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-49849},
  pages     = {116 -- 156},
  year      = {2011},
  abstract  = {Over the last 20 years, information visualization became a common tool in science and also a growing presence in the arts and culture at large. However, the use of visualization in cultural research is still in its infancy. Based on the work in the analysis of video games, cinema, TV, animation, Manga and other media carried out in Software Studies Initiative at University of California, San Diego over last two years, a number of visualization techniques and methods particularly useful for cultural and media research are presented.},
  language  = {en}
}
@article{AlbertGrasseinSchurretal.2011,
  author    = {Albert, C{\´e}cile H. and Grassein, Fabrice and Schurr, Frank Martin and Vieilledent, Ghislain and Violle, Cyrille},
  title     = {When and how should intraspecific variability be considered in trait-based plant ecology?},
  series = {Perspectives in plant ecology, evolution and systematics},
  volume    = {13},
  journal   = {Perspectives in plant ecology, evolution and systematics},
  number    = {3},
  publisher = {Elsevier},
  address   = {Jena},
  issn      = {1433-8319},
  doi       = {10.1016/j.ppees.2011.04.003},
  pages     = {217 -- 225},
  year      = {2011},
  abstract  = {Trait-based studies have become extremely common in plant ecology. Trait-based approaches often rely on the tacit assumption that intraspecific trait variability (ITV) is negligible compared to interspecific variability, so that species can be characterized by mean trait values. Yet, numerous recent studies have challenged this assumption by showing that ITV significantly affects various ecological processes. Accounting for ITV may thus strengthen trait-based approaches, but measuring trait values on a large number of individuals per species and site is not feasible. Therefore, it is important and timely to synthesize existing knowledge on ITV in order to (1) decide critically when ITV should be considered, and (2) establish methods for incorporating this variability. Here we propose a practical set of rules to identify circumstances under which ITV should be accounted for. We formulate a spatial trait variance partitioning hypothesis to highlight the spatial scales at which ITV cannot be ignored in ecological studies. We then refine a set of four consecutive questions on the research question, the spatial scale, the sampling design, and the type of studied traits, to determine case-by-case if a given study should quantify ITV and test its effects. We review methods for quantifying ITV and develop a step-by-step guideline to design and interpret simulation studies that test for the importance of ITV. Even in the absence of quantitative knowledge on ITV, its effects can be assessed by varying trait values within species within realistic bounds around the known mean values. We finish with a discussion of future requirements to further incorporate ITV within trait-based approaches. This paper thus delineates a general framework to account for ITV and suggests a direction towards a more quantitative trait-based ecology.},
  language  = {en}
}
@misc{FischerBrugger2011,
  author    = {Fischer, Martin H. and Brugger, Peter},
  title     = {When digits help digits spatial-numerical associations point to finger counting as prime example of embodied cognition},
  series = {Frontiers in psychology},
  volume    = {2},
  journal   = {Frontiers in psychology},
  publisher = {Frontiers Research Foundation},
  address   = {Lausanne},
  issn      = {1664-1078},
  doi       = {10.3389/fpsyg.2011.00260},
  pages     = {7},
  year      = {2011},
  abstract  = {Spatial numerical associations (SNAs) are prevalent yet their origin is poorly understood. We first consider the possible prime role of reading habits in shaping SNAs and list three observations that argue against a prominent influence of this role: (1) directional reading habits for numbers may conflict with those for non-numerical symbols, (2) short-term experimental manipulations can overrule the impact of decades of reading experience, (3) SNAs predate the acquisition of reading. As a promising alternative, we discuss behavioral, neuroscientific, and neuropsychological evidence in support of finger counting as the most likely initial determinant of SNAs. Implications of this "manumerical cognition" stance for the distinction between grounded, embodied, and situated cognition are discussed.},
  language  = {en}
}
@article{ZhangWielandReicheetal.2011,
  author    = {Zhang, Zhuodong and Wieland, Ralf and Reiche, Matthias and Funk, Roger and Hoffmann, Carsten and Li, Yong and Sommer, Michael},
  title     = {Wind modelling for wind erosion research by open source computational fluid dynamics},
  series = {Ecological informatics : an international journal on ecoinformatics and computational ecolog},
  volume    = {6},
  journal   = {Ecological informatics : an international journal on ecoinformatics and computational ecolog},
  number    = {5},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {1574-9541},
  doi       = {10.1016/j.ecoinf.2011.02.001},
  pages     = {316 -- 324},
  year      = {2011},
  abstract  = {The open source computational fluid dynamics (CFD) wind model (CFD-WEM) for wind erosion research in the Xilingele grassland in Inner Mongolia (autonomous region, China) is compared with two open source CFD models Gerris and OpenFOAM. The evaluation of these models was made according to software technology, implemented methods, handling, accuracy and calculation speed. All models were applied to the same wind tunnel data set. Results show that the simplest CFD-WEM has the highest calculation speed with acceptable accuracy, and the most powerful OpenFOAM produces the simulation with highest accuracy and the lowest calculation speed. Gerris is between CFD-WEM and OpenFOAM. It calculates faster than OpenFOAM, and it is capable to solve different CFD problems. CFD-WEM is the optimal model to be further developed for wind erosion research in Inner Mongolia grassland considering its efficiency and the uncertainties of other input data. However, for other applications using CFD technology, Gerris and OpenFOAM can be good choices. This paper shows the powerful capability of open source CFD software in wind erosion study, and advocates more involvement of open source technology in wind erosion and related ecological researches.},
  language  = {en}
}
@article{MuellerKoszinskiBrenningetal.2011,
  author    = {Mueller, Marina Elsa Herta and Koszinski, Sylvia and Brenning, Alexander and Verch, Gernot and Korn, Ulrike and Sommer, Michael},
  title     = {Within-field variation of mycotoxin contamination of winter wheat is related to indicators of soil moisture},
  series = {Plant and soil},
  volume    = {342},
  journal   = {Plant and soil},
  number    = {1-2},
  publisher = {Springer},
  address   = {Dordrecht},
  issn      = {0032-079X},
  doi       = {10.1007/s11104-010-0695-5},
  pages     = {289 -- 300},
  year      = {2011},
  abstract  = {Humidity is an important determinant of the mycotoxin production (DON, ZEA) by Fusarium species in the grain ears. From a landscape perspective humidity is not evenly distributed across fields. The topographically-controlled redistribution of water within a single field rather leads to spatially heterogeneous soil water content and air humidity. Therefore we hypothesized that the spatial distribution of mycotoxins is related to these topographically-controlled factors. To test this hypothesis we studied the mycotoxin concentrations at contrasting topographic relief positions, i.e. hilltops and depressions characterized by soils of different soil moisture regimes, on ten winter wheat fields in 2006 and 2007. Maize was the preceding crop and minimum tillage was practiced in the fields. The different topographic positions were associated with moderate differences in DON and ZEA concentrations in 2006, but with significant differences in 2007, with six times higher median ZEA and two times higher median DON detected at depression sites compared to the hilltops. The depression sites correspond to a higher topographic wetness index as well as redoximorphic properties in soil profiles, which empirically supports our hypothesis at least for years showing wetter conditions in sensitive time windows for Fusarium infections.},
  language  = {en}
}
@article{VoltmerSpahnSchaarschmidtetal.2011,
  author    = {Voltmer, Edgar and Spahn, Claudia and Schaarschmidt, Uwe and Kieschke, Ulf},
  title     = {Work-related behavior and experience patterns of entrepreneurs compared to teachers and physicians},
  series = {International archives of occupational and environmental health},
  volume    = {84},
  journal   = {International archives of occupational and environmental health},
  number    = {5},
  publisher = {Springer},
  address   = {New York},
  issn      = {0340-0131},
  doi       = {10.1007/s00420-011-0632-9},
  pages     = {479 -- 490},
  year      = {2011},
  abstract  = {Purpose This study examined the status of health-related behavior and experience patterns of entrepreneurs in comparison with teachers and physicians to identify specific health risks and resources. Methods Entrepreneurs (n = 632), teachers (n = 5,196), and physicians (n = 549) were surveyed in a cross-sectional design. The questionnaire Work-related Behavior and Experience Patterns (AVEM) was used for all professions and, in addition, two scales (health prevention and self-confidence) from the Checklist for Entrepreneurs in the sample of entrepreneurs. Results The largest proportion of the entrepreneurs (45\%) presented with a healthy pattern (compared with 18.4\% teachers and 18.3\% physicians). Thirty-eight percent of entrepreneurs showed a risk pattern of overexertion and stress, followed by teachers (28.9\%) and physicians (20.6\%). Unambitious or burnout patterns were seen in only 9.3/8.2\% of entrepreneurs, respectively, and 25.3/27.3\% of teachers, and 39.6/21.5\% of physicians. While the distribution of patterns in teachers and physicians differed significantly between genders, a gender difference was not found among entrepreneurs. Entrepreneurs with the risk pattern of overexertion scored significantly (P < 0.01) lower in self-confidence and health care than those with the healthy pattern. Conclusions The development of a successful enterprise depends, in part, on the health of the entrepreneur. The large proportion of entrepreneurs with the healthy pattern irrespective of gender may support the notion that self-selection effects of healthy individuals in this special career might be important. At the same time, a large proportion was at risk for overexertion and might benefit from measures to cope with professional demands and stress and promote a healthy behavior pattern.},
  language  = {en}
}
@article{FiehlerBannertBischoffetal.2011,
  author    = {Fiehler, Katja and Bannert, Michael M. and Bischoff, Matthias and Blecker, Carlo and Stark, Rudolf and Vaitl, Dieter and Franz, Volker H. and Roesler, Frank},
  title     = {Working memory maintenance of grasp-target information in the human posterior parietal cortex},
  series = {NeuroImage : a journal of brain function},
  volume    = {54},
  journal   = {NeuroImage : a journal of brain function},
  number    = {3},
  publisher = {Elsevier},
  address   = {San Diego},
  issn      = {1053-8119},
  doi       = {10.1016/j.neuroimage.2010.09.080},
  pages     = {2401 -- 2411},
  year      = {2011},
  abstract  = {Event-related functional magnetic resonance imaging was applied to identify cortical areas involved in maintaining target information in working memory used for an upcoming grasping action. Participants had to grasp with their thumb and index finger of the dominant right hand three-dimensional objects of different size and orientation. Reaching-to-grasp movements were performed without visual feedback either immediately after object presentation or after a variable delay of 2-12 s. The right inferior parietal cortex demonstrated sustained neural activity throughout the delay, which overlapped with activity observed during encoding of the grasp target. Immediate and delayed grasping activated similar motor-related brain areas and showed no differential activity. The results suggest that the right inferior parietal cortex plays an important functional role in working memory maintenance of grasp-related information. Moreover, our findings confirm the assumption that brain areas engaged in maintaining information are also involved in encoding the same information, and thus extend previous findings on working memory function of the posterior parietal cortex in saccadic behavior to reach-to-grasp movements.},
  language  = {en}
}
@article{OskinovaHamannCassinellietal.2011,
  author    = {Oskinova, Lida and Hamann, Wolf-Rainer and Cassinelli, Joseph P. and Brown, John C. and Todt, Helge Tobias},
  title     = {X-ray emission from massive stars with magnetic fields},
  series = {Astronomische Nachrichten = Astronomical notes},
  volume    = {332},
  journal   = {Astronomische Nachrichten = Astronomical notes},
  number    = {9-10},
  publisher = {Wiley-Blackwell},
  address   = {Malden},
  issn      = {0004-6337},
  doi       = {10.1002/asna.201111602},
  pages     = {988 -- 993},
  year      = {2011},
  abstract  = {We investigate the connections between the magnetic fields and the X-ray emission from massive stars. Our study shows that the X-ray properties of known strongly magnetic stars are diverse: while some comply to the predictions of the magnetically confined wind model, others do not. We conclude that strong, hard, and variable X-ray emission may be a sufficient attribute of magnetic massive stars, but it is not a necessary one. We address the general properties of X-ray emission from "normal" massive stars, especially the long standing mystery about the correlations between the parameters of X-ray emission and fundamental stellar properties. The recent development in stellar structure modeling shows that small-scale surface magnetic fields may be common. We suggest a "hybrid" scenario which could explain the X-ray emission from massive stars by a combination of magnetic mechanisms on the surface and shocks in the stellar wind. The magnetic mechanisms and the wind shocks are triggered by convective motions in sub-photospheric layers. This scenario opens the door for a natural explanation of the well established correlation between bolometric and X-ray luminosities.},
  language  = {en}
}
@article{ParkinBroosTownsleyetal.2011,
  author    = {Parkin, E. R. and Broos, Patrick S. and Townsley, L. K. and Pittard, J. M. and Moffat, Anthony F. J. and Naze, Y. and Rauw, G. and Oskinova, Lida and Waldron, W. L.},
  title     = {X-RAY EMISSION FROM THE DOUBLE-BINARY OB-STAR SYSTEM QZ CAR (HD 93206)},
  series = {ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES},
  volume    = {194},
  journal   = {ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES},
  number    = {1},
  publisher = {IOP PUBLISHING LTD},
  address   = {BRISTOL},
  issn      = {0067-0049},
  doi       = {10.1088/0067-0049/194/1/8},
  pages     = {11},
  year      = {2011},
  abstract  = {X-ray observations of the double-binary OB-star system QZ Car (HD 93206) obtained with the Chandra X-ray Observatory over a period of roughly 2 years are presented. The respective orbits of systems A (O9.7 I+b2 v, P-A = 21 days) and B (O8 III+o9 v, P-B = 6 days) are reasonably well sampled by the observations, allowing the origin of the X-ray emission to be examined in detail. The X-ray spectra can be well fitted by an attenuated three-temperature thermal plasma model, characterized by cool, moderate, and hot plasma components at kT similar or equal to 0.2, 0.7, and 2 keV, respectively, and a circumstellar absorption of similar or equal to 0.2 x 10(22) cm(-2). Although the hot plasma component could be indicating the presence of wind-wind collision shocks in the system, the model fluxes calculated from spectral fits, with an average value of similar or equal to 7x10(-13) erg s(-1) cm(-2), do not show a clear correlation with the orbits of the two constituent binaries. A semi-analytical model of QZ Car reveals that a stable momentum balance may not be established in either system A or B. Yet, despite this, system B is expected to produce an observed X-ray flux well in excess of the observations. If one considers the wind of the O8 III star to be disrupted by mass transfer, the model and observations are in far better agreement, which lends support to the previous suggestion of mass transfer in the O8 III+o9 v binary. We conclude that the X-ray emission from QZ Car can be reasonably well accounted for by a combination of contributions mainly from the single stars and the mutual wind-wind collision between systems A and B.},
  language  = {en}
}
@article{GiewekemeyerKruegerKalbfleischetal.2011,
  author    = {Giewekemeyer, K. and Krueger, S. P. and Kalbfleisch, S. and Bartels, Meike and Beta, Carsten and Salditt, T.},
  title     = {X-ray propagation microscopy of biological cells using waveguides as a quasipoint source},
  series = {Physical review : A, Atomic, molecular, and optical physics},
  volume    = {83},
  journal   = {Physical review : A, Atomic, molecular, and optical physics},
  number    = {2},
  publisher = {American Physical Society},
  address   = {College Park},
  issn      = {1050-2947},
  doi       = {10.1103/PhysRevA.83.023804},
  pages     = {7},
  year      = {2011},
  abstract  = {We have used x-ray waveguides as highly confining optical elements for nanoscale imaging of unstained biological cells using the simple geometry of in-line holography. The well-known twin-image problem is effectively circumvented by a simple and fast iterative reconstruction. The algorithm which combines elements of the classical Gerchberg-Saxton scheme and the hybrid-input-output algorithm is optimized for phase-contrast samples, well-justified for imaging of cells at multi-keV photon energies. The experimental scheme allows for a quantitative phase reconstruction from a single holographic image without detailed knowledge of the complex illumination function incident on the sample, as demonstrated for freeze-dried cells of the eukaryotic amoeba Dictyostelium discoideum. The accessible resolution range is explored by simulations, indicating that resolutions on the order of 20 nm are within reach applying illumination times on the order of minutes at present synchrotron sources.},
  language  = {en}
}
@phdthesis{Wang2011,
  author    = {Wang, Long},
  title     = {X-tracking the usage interest on web sites},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-51077},
  school      = {Universit{\"a}t Potsdam},
  year      = {2011},
  abstract  = {The exponential expanding of the numbers of web sites and Internet users makes WWW the most important global information resource. From information publishing and electronic commerce to entertainment and social networking, the Web allows an inexpensive and efficient access to the services provided by individuals and institutions. The basic units for distributing these services are the web sites scattered throughout the world. However, the extreme fragility of web services and content, the high competence between similar services supplied by different sites, and the wide geographic distributions of the web users drive the urgent requirement from the web managers to track and understand the usage interest of their web customers. This thesis, "X-tracking the Usage Interest on Web Sites", aims to fulfill this requirement. "X" stands two meanings: one is that the usage interest differs from various web sites, and the other is that usage interest is depicted from multi aspects: internal and external, structural and conceptual, objective and subjective. "Tracking" shows that our concentration is on locating and measuring the differences and changes among usage patterns. This thesis presents the methodologies on discovering usage interest on three kinds of web sites: the public information portal site, e-learning site that provides kinds of streaming lectures and social site that supplies the public discussions on IT issues. On different sites, we concentrate on different issues related with mining usage interest. The educational information portal sites were the first implementation scenarios on discovering usage patterns and optimizing the organization of web services. In such cases, the usage patterns are modeled as frequent page sets, navigation paths, navigation structures or graphs. However, a necessary requirement is to rebuild the individual behaviors from usage history. We give a systematic study on how to rebuild individual behaviors. Besides, this thesis shows a new strategy on building content clusters based on pair browsing retrieved from usage logs. The difference between such clusters and the original web structure displays the distance between the destinations from usage side and the expectations from design side. Moreover, we study the problem on tracking the changes of usage patterns in their life cycles. The changes are described from internal side integrating conceptual and structure features, and from external side for the physical features; and described from local side measuring the difference between two time spans, and global side showing the change tendency along the life cycle. A platform, Web-Cares, is developed to discover the usage interest, to measure the difference between usage interest and site expectation and to track the changes of usage patterns. E-learning site provides the teaching materials such as slides, recorded lecture videos and exercise sheets. We focus on discovering the learning interest on streaming lectures, such as real medias, mp4 and flash clips. Compared to the information portal site, the usage on streaming lectures encapsulates the variables such as viewing time and actions during learning processes. The learning interest is discovered in the form of answering 6 questions, which covers finding the relations between pieces of lectures and the preference among different forms of lectures. We prefer on detecting the changes of learning interest on the same course from different semesters. The differences on the content and structure between two courses leverage the changes on the learning interest. We give an algorithm on measuring the difference on learning interest integrated with similarity comparison between courses. A search engine, TASK-Moniminer, is created to help the teacher query the learning interest on their streaming lectures on tele-TASK site. Social site acts as an online community attracting web users to discuss the common topics and share their interesting information. Compared to the public information portal site and e-learning web site, the rich interactions among users and web content bring the wider range of content quality, on the other hand, provide more possibilities to express and model usage interest. We propose a framework on finding and recommending high reputation articles in a social site. We observed that the reputation is classified into global and local categories; the quality of the articles having high reputation is related with the content features. Based on these observations, our framework is implemented firstly by finding the articles having global or local reputation, and secondly clustering articles based on their content relations, and then the articles are selected and recommended from each cluster based on their reputation ranks.},
  language  = {en}
}
@article{KalimuthuLeimkuehlerBernhardt2011,
  author    = {Kalimuthu, Palraj and Leimk{\"u}hler, Silke and Bernhardt, Paul V.},
  title     = {Xanthine dehydrogenase electrocatalysis autocatalysis and novel activity},
  series = {The journal of physical chemistry : B, Condensed matter, materials, surfaces, interfaces \& biophysical chemistry},
  volume    = {115},
  journal   = {The journal of physical chemistry : B, Condensed matter, materials, surfaces, interfaces \& biophysical chemistry},
  number    = {11},
  publisher = {American Chemical Society},
  address   = {Washington},
  issn      = {1520-6106},
  doi       = {10.1021/jp111809f},
  pages     = {2655 -- 2662},
  year      = {2011},
  abstract  = {The enzyme xanthine dehydrogenase (XDH) from the purple photosynthetic bacterium Rhodobacter capsulatus catalyzes the oxidation of hypoxanthine to xanthine and xanthine to uric acid as part of purine metabolism. The native electron acceptor is NAD(+) but herein we show that uric acid in its 2-electron oxidized form is able to act as an artificial electron acceptor from XDH in an electrochemically driven catalytic system. Hypoxanthine oxidation is also observed with the novel production of uric acid in a series of two consecutive 2-electron oxidation reactions via xanthine. XDH exhibits native activity in terms of its pH optimum and inhibition by allopurinol.},
  language  = {en}
}
@article{RedelbergerSedukGenestetal.2011,
  author    = {Redelberger, David and Seduk, Farida and Genest, Olivier and Mejean, Vincent and Leimk{\"u}hler, Silke and Iobbi-Nivol, Chantal},
  title     = {YcdY Protein of Escherichia coli, an Atypical Member of the TorD Chaperone Family},
  series = {Journal of bacteriology},
  volume    = {193},
  journal   = {Journal of bacteriology},
  number    = {23},
  publisher = {American Society for Microbiology},
  address   = {Washington},
  issn      = {0021-9193},
  doi       = {10.1128/JB.05927-11},
  pages     = {6512 -- 6516},
  year      = {2011},
  abstract  = {The TorD family of specific chaperones is divided into four subfamilies dedicated to molybdoenzyme biogenesis and a fifth one, exemplified by YcdY of Escherichia coli, for which no defined partner has been identified so far. We propose that YcdY is the chaperone of YcdX, a zinc protein involved in the swarming motility process of E. coli, since YcdY interacts with YcdX and increases its activity in vitro.},
  language  = {en}
}
@article{LilieBaerKettneretal.2011,
  author    = {Lilie, Hauke and B{\"a}r, Dorit and Kettner, Karina and Weininger, Ulrich and Balbach, Jochen and Naumann, Manfred and M{\"u}ller, Eva-Christina and Otto, Albrecht and Gast, Klaus and Golbik, Ralph},
  title     = {Yeast hexokinase isoenzyme ScHxk2 : stability of a two-domain protein with discontinuous domains},
  issn      = {0269-2139},
  year      = {2011},
  abstract  = {The hexokinase isoenzyme 2 of Saccharomyces cerevisiae (ScHxk2) represents an archetype of a two-domain protein with the active site located in a cleft between the two domains. Binding of the substrate glucose results in a rigid body movement of the two domains leading to a cleft closure of the active site. Both domains of this enzyme are composed of discontinuous peptide sequences. This structural feature is reflected in the stability and folding of the ScHxk2 protein. Structural transitions induced by urea treatment resulted in the population of a thermodynamically stable folding intermediate, which, however, does not correspond to a molecule with one domain folded and the other unfolded. As demonstrated by different spectroscopic techniques, both domains are structurally affected by the partial denaturation. The intermediate possesses only 40\% of the native secondary structural content and a substantial increase in the Stokes radius as judged by circular dichroism and dynamic light scattering analyses. One-dimensional 1H NMR data prove that all tryptophan residues are in a non-native environment in the intermediate, indicating substantial changes in the tertiary structure. Still, the intermediate possesses quite a high stability for a transition intermediate of about ;G = ;22 kJ mol;1.},
  language  = {en}
}
@article{LilieBaerKettneretal.2011,
  author    = {Lilie, Hauke and Baer, Dorit and Kettner, Karina and Weininger, Ulrich and Balbach, Jochen and Naumann, Manfred and Mueller, Eva-Christina and Otto, Albrecht and Gast, Klaus and Golbik, Ralph and Kriegel, Thomas},
  title     = {Yeast hexokinase isoenzyme ScHxk2 stability of a two-domain protein with discontinuous domains},
  series = {Protein engineering design \& selection},
  volume    = {24},
  journal   = {Protein engineering design \& selection},
  number    = {1-2},
  publisher = {Oxford Univ. Press},
  address   = {Oxford},
  issn      = {1741-0126},
  doi       = {10.1093/protein/gzq098},
  pages     = {79 -- 87},
  year      = {2011},
  abstract  = {The hexokinase isoenzyme 2 of Saccharomyces cerevisiae (ScHxk2) represents an archetype of a two-domain protein with the active site located in a cleft between the two domains. Binding of the substrate glucose results in a rigid body movement of the two domains leading to a cleft closure of the active site. Both domains of this enzyme are composed of discontinuous peptide sequences. This structural feature is reflected in the stability and folding of the ScHxk2 protein. Structural transitions induced by urea treatment resulted in the population of a thermodynamically stable folding intermediate, which, however, does not correspond to a molecule with one domain folded and the other unfolded. As demonstrated by different spectroscopic techniques, both domains are structurally affected by the partial denaturation. The intermediate possesses only 40\% of the native secondary structural content and a substantial increase in the Stokes radius as judged by circular dichroism and dynamic light scattering analyses. One-dimensional H-1 NMR data prove that all tryptophan residues are in a non-native environment in the intermediate, indicating substantial changes in the tertiary structure. Still, the intermediate possesses quite a high stability for a transition intermediate of about Delta G = -22 kJ mol(-1).},
  language  = {en}
}
@phdthesis{Hoernke2011,
  author    = {H{\"o}rnke, Maria},
  title     = {ß-Sheet formation of amyloidogenic model peptides at hydrophobic-hydrophilic interfaces},
  address   = {Potsdam},
  pages     = {107, XXI S.},
  year      = {2011},
  language  = {en}
}
@misc{Vicente2011,
  author    = {Vicente, Luis},
  title     = {{\´A}ngel J. Gallego, Phase theory},
  series = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {539},
  issn      = {1866-8364},
  doi       = {10.25932/publishup-41311},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-413116},
  pages     = {719 -- 724},
  year      = {2011},
  language  = {en}
}