@article{WirthMonturetKlamrothetal.2011,
  author    = {Wirth, Jonas and Monturet, Serge and Klamroth, Tillmann and Saalfrank, Peter},
  title     = {Adsorption and (photo-) electrochemical splitting of water on rutile ruthenium dioxide},
  series = {epl : a letters journal exploring the frontiers of physics},
  volume    = {93},
  journal   = {epl : a letters journal exploring the frontiers of physics},
  number    = {6},
  publisher = {EDP Sciences},
  address   = {Mulhouse},
  issn      = {0295-5075},
  doi       = {10.1209/0295-5075/93/68001},
  pages     = {6},
  year      = {2011},
  abstract  = {In this work, the adsorption and splitting of the water molecule by light and/or an external potential is investigated in the frame of (photo-) electrochemical cells using a rutile ruthenium dioxide anode. With the help of periodic density functional calculations, the adsorbed structures of H(2)O and some radicals involved in the splitting process (O, OH, OOH) are obtained and compared with the available experimental results. On the basis of these electronic-structure calculations, we use a method to calculate the stability of the reaction intermediates and conclude on the thermodynamical possibility of the water splitting reaction at the surface. We demonstrate that a moderate overpotential of 0.64 V is required for the reaction to take place at the RuO(2)(110) surface.},
  language  = {en}
}
@book{Wipper2011,
  author    = {Wipper, Alexander},
  title     = {Flugverkehr und Risikodiskurs},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  isbn      = {978-3-86956-136-3},
  issn      = {0934-716X},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-49533},
  publisher      = {Universit{\"a}t Potsdam},
  pages     = {58},
  year      = {2011},
  abstract  = {F{\"u}r den Flugverkehr als Teil eines regional und global verdichteten Infrastruktursystems sind Naturgefahren wie Vulkanausbr{\"u}che gleichbedeutend mit Risiken. Die Kommunikation von Risiken verl{\"a}uft im Spannungsfeld von wirtschaftlichen und staatlichen Akteuren einerseits und Medien und Zivilgesellschaft andererseits. Demgegen{\"u}ber stehen Modelle diskursiver Risikoregulierung als Instrumente {\"o}ffentlicher Aushandlungsprozesse. Diskutiert werden Einflussfaktoren auf Entscheidungen im Kontext von Risikodiskursen. Dabei wird insbesondere die Funktionslogik der Medien untersucht. Am Beispiel der Aschewolke des Eyjafjallaj{\"o}kull 2010 wird die Ph{\"a}nomenkonstellation von Akteuren und Diskurspositionen illustriert und der Verlauf einer medialen Risikoentwicklung nachgezeichnet.},
  language  = {de}
}
@article{WintleBekessyKeithetal.2011,
  author    = {Wintle, Brendan A. and Bekessy, Sarah A. and Keith, David A. and van Wilgen, Brian W. and Cabeza, Mar and Schr{\"o}der-Esselbach, Boris and Carvalho, Silvia B. and Falcucci, Alessandra and Maiorano, Luigi and Regan, Tracey J. and Rondinini, Carlo and Boitani, Luigi and Possingham, Hugh P.},
  title     = {Ecological-economic optimization of biodiversity conservation under climate change},
  series = {Nature climate change},
  volume    = {1},
  journal   = {Nature climate change},
  number    = {7},
  publisher = {Nature Publ. Group},
  address   = {London},
  issn      = {1758-678X},
  doi       = {10.1038/NCLIMATE1227},
  pages     = {355 -- 359},
  year      = {2011},
  abstract  = {Substantial investment in climate change research has led to dire predictions of the impacts and risks to biodiversity. The Intergovernmental Panel on Climate Change fourth assessment report(1) cites 28,586 studies demonstrating significant biological changes in terrestrial systems(2). Already high extinction rates, driven primarily by habitat loss, are predicted to increase under climate change(3-6). Yet there is little specific advice or precedent in the literature to guide climate adaptation investment for conserving biodiversity within realistic economic constraints(7). Here we present a systematic ecological and economic analysis of a climate adaptation problem in one of the world's most species-rich and threatened ecosystems: the South African fynbos. We discover a counterintuitive optimal investment strategy that switches twice between options as the available adaptation budget increases. We demonstrate that optimal investment is nonlinearly dependent on available resources, making the choice of how much to invest as important as determining where to invest and what actions to take. Our study emphasizes the importance of a sound analytical framework for prioritizing adaptation investments(4). Integrating ecological predictions in an economic decision framework will help support complex choices between adaptation options under severe uncertainty. Our prioritization method can be applied at any scale to minimize species loss and to evaluate the robustness of decisions to uncertainty about key assumptions.},
  language  = {en}
}
@article{Winter2011,
  author    = {Winter, Martin},
  title     = {Praxis des Studierens und Praxisbezug im Studium},
  series = {Potsdamer Beitr{\"a}ge zur Hochschulforschung},
  journal   = {Potsdamer Beitr{\"a}ge zur Hochschulforschung},
  number    = {1},
  issn      = {2192-1075},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-52664},
  pages     = {7 -- 43},
  year      = {2011},
  language  = {de}
}
@misc{Winkler2011,
  type      = {Master Thesis},
  author    = {Winkler, Michael},
  title     = {Thinning and turbulence in aqueous films},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-53107},
  school      = {Universit{\"a}t Potsdam},
  year      = {2011},
  abstract  = {This thesis covers the topic "Thinning and Turbulence in Aqueous Films". Experimental studies in two-dimensional systems gained an increasing amount of attention during the last decade. Thin liquid films serve as paradigms of atmospheric convection, thermal convection in the Earth's mantle or turbulence in magnetohydrodynamics. Recent research on colloids, interfaces and nanofluids lead to advances in the developtment of micro-mixers (lab-on-a-chip devices). In this project a detailed description of a thin film experiment with focus on the particular surface forces is presented. The impact of turbulence on the thinning of liquid films which are oriented parallel to the gravitational force is studied. An experimental setup was developed which permits the capturing of thin film interference patterns under controlled surface and atmospheric conditions. The measurement setup also serves as a prototype of a mixer on the basis of thermally induced turbulence in liquid thin films with thicknesses in the nanometer range. The convection is realized by placing a cooled copper rod in the center of the film. The temperature gradient between the rod and the atmosphere results in a density gradient in the liquid film, so that different buoyancies generate turbulence. In the work at hand the thermally driven convection is characterized by a newly developed algorithm, named Cluster Imaging Velocimetry (CIV). This routine determines the flow relevant vector fields (velocity and deformation). On the basis of these insights the flow in the experiment was investigated with respect to its mixing properties. The mixing characteristics were compared to theoretical models and mixing efficiency of the flow scheme calculated. The gravitationally driven thinning of the liquid film was analyzed under the influence of turbulence. Strong shear forces lead to the generation of ultra-thin domains which consist of Newton black film. Due to the exponential expansion of the thin areas and the efficient mixing, this two-phase flow rapidly turns into the convection of only ultra-thin film. This turbulence driven transition was observed and quantified for the first time. The existence of stable convection in liquid nanofilms was proven for the first time in the context of this work.},
  language  = {en}
}
@article{WinkelmannMartinHaseloffetal.2011,
  author    = {Winkelmann, Ricarda and Martin, Maria A. and Haseloff, Monika and Albrecht, Torsten and Bueler, Ed and Khroulev, C. and Levermann, Anders},
  title     = {The Potsdam parallel ice sheet model (PISM-PIK) - Part 1: Model description},
  series = {The Cryosphere : TC ; an interactive open access journal of the European Geosciences Union},
  volume    = {5},
  journal   = {The Cryosphere : TC ; an interactive open access journal of the European Geosciences Union},
  number    = {3},
  publisher = {Copernicus},
  address   = {G{\"o}ttingen},
  issn      = {1994-0416},
  doi       = {10.5194/tc-5-715-2011},
  pages     = {715 -- 726},
  year      = {2011},
  abstract  = {We present the Potsdam Parallel Ice Sheet Model (PISM-PIK), developed at the Potsdam Institute for Climate Impact Research to be used for simulations of large-scale ice sheet-shelf systems. It is derived from the Parallel Ice Sheet Model (Bueler and Brown, 2009). Velocities are calculated by superposition of two shallow stress balance approximations within the entire ice covered region: the shallow ice approximation (SIA) is dominant in grounded regions and accounts for shear deformation parallel to the geoid. The plug-flow type shallow shelf approximation (SSA) dominates the velocity field in ice shelf regions and serves as a basal sliding velocity in grounded regions. Ice streams can be identified diagnostically as regions with a significant contribution of membrane stresses to the local momentum balance. All lateral boundaries in PISM-PIK are free to evolve, including the grounding line and ice fronts. Ice shelf margins in particular are modeled using Neumann boundary conditions for the SSA equations, reflecting a hydrostatic stress imbalance along the vertical calving face. The ice front position is modeled using a subgrid-scale representation of calving front motion (Albrecht et al., 2011) and a physically-motivated calving law based on horizontal spreading rates. The model is tested in experiments from the Marine Ice Sheet Model Intercomparison Project (MISMIP). A dynamic equilibrium simulation of Antarctica under present-day conditions is presented in Martin et al. (2011).},
  language  = {en}
}
@phdthesis{Winkelmann2011,
  author    = {Winkelmann, Jan},
  title     = {Die Mark Brandenburg des 14. Jahrhunderts : markgr{\"a}fliche Herrschaft zwischen r{\"a}umlicher "Ferne" und politischer "Krise"},
  series = {Studien zur brandenburgischen und vergleichenden Landesgeschichte},
  volume    = {5},
  journal   = {Studien zur brandenburgischen und vergleichenden Landesgeschichte},
  publisher = {Lukas-Verl.},
  address   = {Berlin},
  isbn      = {978-3-86732-112-9},
  pages     = {371 S.},
  year      = {2011},
  language  = {de}
}
@article{Winkelmann2011,
  author    = {Winkelmann, Ingo},
  title     = {GASP der Europ{\"a}ischen Union in den Vereinten Nationen am Beispiel der Reform des Sicherheitsrats der Vereinten Nationen},
  series = {Die Vereinten Nationen vor globalen Herausforderungen : Referate der Potsdamer UNO-Konferenzen 2000-2008},
  journal   = {Die Vereinten Nationen vor globalen Herausforderungen : Referate der Potsdamer UNO-Konferenzen 2000-2008},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus-61219},
  pages     = {371 -- 377},
  year      = {2011},
  abstract  = {Inhalt: - 1. Die Nichtwahrnehmung von Reformchancen durch die EU-Mitgliedstaaten - 2. Das Reformraster: der Razali-Vorschlag - 3. H{\"u}rden f{\"u}r eine einheitliche EU-Vertretung im UN-Sicherheitsrat},
  language  = {de}
}
@article{Winkelmann2011,
  author    = {Winkelmann, Ingo},
  title     = {Die Vereinten Nationen, das Seerecht und die Polarregionen},
  series = {Die Vereinten Nationen zehn Jahre nach dem Millenniumsgipfel 2000 - eine Bilanz},
  volume    = {2011},
  journal   = {Die Vereinten Nationen zehn Jahre nach dem Millenniumsgipfel 2000 - eine Bilanz},
  number    = {9},
  publisher = {Universit{\"a}tsverlag Potsdam},
  address   = {Potsdam},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-101555},
  pages     = {27 -- 37},
  year      = {2011},
  abstract  = {I. Die Vereinten Nationen als Seerechtsrahmen II. Die arktische Polarregion III. Die antarktische Polarregion IV. Abschließende Bemerkungen},
  language  = {de}
}
@article{WinkelBenBekhtiDarmstaedteretal.2011,
  author    = {Winkel, B. and Ben Bekhti, Nadya and Darmstaedter, V. and Floeer, L. and Kerp, J. and Richter, Philipp},
  title     = {The high-velocity cloud complex Galactic center negative as seen by EBHIS and GASS I. Cloud catalog and global properties},
  series = {Astronomy and astrophysics : an international weekly journal},
  volume    = {533},
  journal   = {Astronomy and astrophysics : an international weekly journal},
  number    = {18},
  publisher = {EDP Sciences},
  address   = {Les Ulis},
  issn      = {0004-6361},
  doi       = {10.1051/0004-6361/201117357},
  pages     = {13},
  year      = {2011},
  abstract  = {Using Milky Way data of the new Effelsberg-Bonn HI Survey (EBHIS) and the Galactic All-Sky Survey (GASS), we present a revised picture of the high-velocity cloud (HVC) complex Galactic center negative (GCN). Owing to the higher angular resolution of these surveys compared to previous studies (e.g., the Leiden Dwingeloo Survey), we resolve complex GCN into lots of individual tiny clumps, that mostly have relatively broad line widths of more than 15 km s(-1). We do not detect a diffuse extended counterpart, which is unusual for an HVC complex. In total 243 clumps were identified and parameterized which allows us to statistically analyze the data. Cold-line components (i.e.,Delta upsilon(fwhm) < 7.5 km s(-1)) are found in about 5\% only of the identified cloudlets. Our analysis reveals that complex GCN is likely built up of several subpopulations that do not share a common origin. Furthermore, complex GCN might be a prime example for warm-gas accretion onto the Milky Way, where neutral HI clouds are not stable against interaction with the Milky Way gas halo and become ionized prior to accretion.},
  language  = {en}
}