TY - INPR A1 - Weske, Mathias A1 - Yang, Jian A1 - Maglio, Paul P. T1 - Special issue service oriented computing (ICSOC) guest editors' introduction T2 - International journal of cooperative information systems Y1 - 2012 U6 - https://doi.org/10.1142/S0218843012020017 SN - 0218-8430 VL - 21 IS - 1 SP - 1 EP - 2 PB - World Scientific CY - Singapore ER - TY - INPR A1 - Wannicke, Nicola A1 - Endres, S. A1 - Engel, A. A1 - Grossart, Hans-Peter A1 - Nausch, M. A1 - Unger, J. A1 - Voss, Martin T1 - Response of nodularia spumigena to pCO(2) - Part 1: Growth, production and nitrogen cycling T2 - Biogeosciences N2 - Heterocystous cyanobacteria of the genus Nodularia form extensive blooms in the Baltic Sea and contribute substantially to the total annual primary production. Moreover, they dispense a large fraction of new nitrogen to the ecosystem when inorganic nitrogen concentration in summer is low. Thus, it is of ecological importance to know how Nodularia will react to future environmental changes, in particular to increasing carbon dioxide (CO2) concentrations and what consequences there might arise for cycling of organic matter in the Baltic Sea. Here, we determined carbon (C) and dinitrogen (N-2) fixation rates, growth, elemental stoichiometry of particulate organic matter and nitrogen turnover in batch cultures of the heterocystous cyanobacterium Nodularia spumigena under low (median 315 mu atm), mid (median 353 mu atm), and high (median 548 mu atm) CO2 concentrations. Our results demonstrate an overall stimulating effect of rising pCO(2) on C and N-2 fixation, as well as on cell growth. An increase in pCO(2) during incubation days 0 to 9 resulted in an elevation in growth rate by 84 +/- 38% (low vs. high pCO(2)) and 40 +/- 25% (mid vs. high pCO(2)), as well as in N-2 fixation by 93 +/- 35% and 38 +/- 1%, respectively. C uptake rates showed high standard deviations within treatments and in between sampling days. Nevertheless, C fixation in the high pCO(2) treatment was elevated compared to the other two treatments by 97% (high vs. low) and 44% (high vs. mid) at day 0 and day 3, but this effect diminished afterwards. Additionally, elevation in carbon to nitrogen and nitrogen to phosphorus ratios of the particulate biomass formed (POC : POP and PON : POP) was observed at high pCO(2). Our findings suggest that rising pCO(2) stimulates the growth of heterocystous diazotrophic cyanobacteria, in a similar way as reported for the non-heterocystous diazotroph Trichodesmium. Implications for biogeochemical cycling and food web dynamics, as well as ecological and socio-economical aspects in the Baltic Sea are discussed. Y1 - 2012 U6 - https://doi.org/10.5194/bg-9-2973-2012 SN - 1726-4170 VL - 9 IS - 8 SP - 2973 EP - 2988 PB - Copernicus CY - Göttingen ER - TY - INPR A1 - Tarkhanov, Nikolai Nikolaevich A1 - Wallenta, Daniel T1 - The Lefschetz number of sequences of trace class curvature N2 - For a sequence of Hilbert spaces and continuous linear operators the curvature is defined to be the composition of any two consecutive operators. This is modeled on the de Rham resolution of a connection on a module over an algebra. Of particular interest are those sequences for which the curvature is "small" at each step, e.g., belongs to a fixed operator ideal. In this context we elaborate the theory of Fredholm sequences and show how to introduce the Lefschetz number. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1 (2012) 3 KW - Perturbed complexes KW - curvature KW - Lefschetz number Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-56969 ER - TY - INPR A1 - Tarkhanov, Nikolai Nikolaevich T1 - A simple numerical approach to the Riemann hypothesis N2 - The Riemann hypothesis is equivalent to the fact the the reciprocal function 1/zeta (s) extends from the interval (1/2,1) to an analytic function in the quarter-strip 1/2 < Re s < 1 and Im s > 0. Function theory allows one to rewrite the condition of analytic continuability in an elegant form amenable to numerical experiments. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1 (2012) 9 Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57645 SN - 2193-6943 ER - TY - INPR A1 - Sprinz, Detlef F. T1 - Long-Term environmental policy challenges for research T2 - The journal of environment & development : a review of international policy N2 - Long-term policy issues are a particularly vexing class of environmental policy issues which merit increasing attention due to the long-time horizons involved, the incongruity with political cycles, and the challenges for collective action. Following the definition of long-term environmental policy challenges, I pose three questions as challenges for future research, namely 1. Are present democracies well suited to cope with long-term policy challenges? 2. Are top-down or bottom-up solutions to long-term environmental policy challenges advisable? 3. Will mitigation and adaptation of environmental challenges suffice? In concluding, the contribution raises the issue of credible commitment for long-term policy issues and potential design options. KW - anniversary issue KW - long-term policy KW - definition KW - design options KW - environmental policy Y1 - 2012 U6 - https://doi.org/10.1177/1070496511435667 SN - 1070-4965 VL - 21 IS - 1 SP - 67 EP - 70 PB - Sage Publ. CY - Thousand Oaks ER - TY - INPR A1 - Springer, Anne A1 - Hamilton, Antonia F. de C. A1 - Cross, Emily S. T1 - Simulating and predicting others' actions T2 - Psychological research : an international journal of perception, attention, memory, and action Y1 - 2012 U6 - https://doi.org/10.1007/s00426-012-0443-y SN - 0340-0727 VL - 76 IS - 4 SP - 383 EP - 387 PB - Springer CY - Heidelberg ER - TY - INPR A1 - Shlapunov, Alexander A1 - Tarkhanov, Nikolai Nikolaevich T1 - On completeness of root functions of Sturm-Liouville problems with discontinuous boundary operators N2 - We consider a Sturm-Liouville boundary value problem in a bounded domain D of R^n. By this is meant that the differential equation is given by a second order elliptic operator of divergent form in D and the boundary conditions are of Robin type on bD. The first order term of the boundary operator is the oblique derivative whose coefficients bear discontinuities of the first kind. Applying the method of weak perturbation of compact self-adjoint operators and the method of rays of minimal growth, we prove the completeness of root functions related to the boundary value problem in Lebesgue and Sobolev spaces of various types. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)11 KW - Sturm-Liouville problems KW - discontinuous Robin condition KW - root functions KW - Lipschitz domains Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-57759 SN - 2193-6943 ER - TY - INPR A1 - Schröder, Peter A1 - Asbach, Olaf A1 - Breckman, Warren A1 - Bourke, Richard A1 - Busen, Andreas A1 - D'Aprile, Iwan-Michelangelo A1 - Hunter, Ian T1 - History of political thought T2 - German history : the journal of the German History Societ Y1 - 2012 U6 - https://doi.org/10.1093/gerhis/ghr126 SN - 0266-3554 VL - 30 IS - 1 SP - 75 EP - 99 PB - Oxford Univ. Press CY - Oxford ER - TY - INPR A1 - Scherf, Ullrich A1 - Tian, He T1 - Organic electronics/optics for an energetic life T2 - Advanced materials Y1 - 2012 U6 - https://doi.org/10.1002/adma.201104917 SN - 0935-9648 VL - 24 IS - 5 SP - 576 EP - 579 PB - Wiley-Blackwell CY - Malden ER - TY - INPR A1 - Rattana, Amornrat A1 - Böckmann, Christine T1 - Matrix methods for computing Eigenvalues of Sturm-Liouville problems of order four N2 - This paper examines and develops matrix methods to approximate the eigenvalues of a fourth order Sturm-Liouville problem subjected to a kind of fixed boundary conditions, furthermore, it extends the matrix methods for a kind of general boundary conditions. The idea of the methods comes from finite difference and Numerov's method as well as boundary value methods for second order regular Sturm-Liouville problems. Moreover, the determination of the correction term formulas of the matrix methods are investigated in order to obtain better approximations of the problem with fixed boundary conditions since the exact eigenvalues for q = 0 are known in this case. Finally, some numerical examples are illustrated. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)13 KW - Finite difference method KW - Numerov's method KW - Boundary value methods KW - Fourth order Sturm-Liouville problem KW - Eigenvalues Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-59279 ER - TY - INPR A1 - Pfäffle, Frank A1 - Stephan, Christoph A. T1 - On gravity, torsion and the spectral action principle N2 - We consider compact Riemannian spin manifolds without boundary equipped with orthogonal connections. We investigate the induced Dirac operators and the associated commutative spectral triples. In case of dimension four and totally anti-symmetric torsion we compute the Chamseddine-Connes spectral action, deduce the equations of motions and discuss critical points. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)16 Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-59989 SN - 2193-6943 ER - TY - INPR A1 - Pfäffle, Frank A1 - Stephan, Christoph A. T1 - The Holst action by the spectral action principle N2 - We investigate the Holst action for closed Riemannian 4-manifolds with orthogonal connections. For connections whose torsion has zero Cartan type component we show that the Holst action can be recovered from the heat asymptotics for the natural Dirac operator acting on left-handed spinor fields. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)19 Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-60032 ER - TY - INPR A1 - Pfäffle, Frank A1 - Stephan, Christoph A. T1 - Chiral asymmetry and the spectral action N2 - We consider orthogonal connections with arbitrary torsion on compact Riemannian manifolds. For the induced Dirac operators, twisted Dirac operators and Dirac operators of Chamseddine-Connes type we compute the spectral action. In addition to the Einstein-Hilbert action and the bosonic part of the Standard Model Lagrangian we find the Holst term from Loop Quantum Gravity, a coupling of the Holst term to the scalar curvature and a prediction for the value of the Barbero-Immirzi parameter. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)20 Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-60046 ER - TY - INPR A1 - Neumann, Mike T1 - 15 years younger chemists GDCh-Forum - the Future firmly in sight T2 - Chemie in unserer Zeit Y1 - 2012 U6 - https://doi.org/10.1002/ciuz.201290028 SN - 0009-2851 VL - 46 IS - 3 SP - 131 EP - 131 PB - Wiley-VCH CY - Weinheim ER - TY - INPR A1 - Nehring, Benjamin T1 - Construction of point processes for classical and quantum gases N2 - We propose a new construction of point processes, which generalizes the class of infinitely divisible point processes. Examples are the quantum Boson and Fermion gases as well as the classical Gibbs point processes, where the interaction is given by a stable and regular pair potential. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)14 KW - Gibbs point processes KW - permanental- KW - determinantal point processes KW - cluster expansion KW - Lévy measure KW - infinitely divisible point processes Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-59648 ER - TY - INPR A1 - Murr, Rüdiger T1 - Reciprocal classes of Markov processes : an approach with duality formulae N2 - In this work we are concerned with the characterization of certain classes of stochastic processes via duality formulae. First, we introduce a new formulation of a characterization of processes with independent increments, which is based on an integration by parts formula satisfied by infinitely divisible random vectors. Then we focus on the study of the reciprocal classes of Markov processes. These classes contain all stochastic processes having the same bridges, and thus similar dynamics, as a reference Markov process. We start with a resume of some existing results concerning the reciprocal classes of Brownian diffusions as solutions of duality formulae. As a new contribution, we show that the duality formula satisfied by elements of the reciprocal class of a Brownian diffusion has a physical interpretation as a stochastic Newton equation of motion. In the context of pure jump processes we derive the following new results. We will analyze the reciprocal classes of Markov counting processes and characterize them as a group of stochastic processes satisfying a duality formula. This result is applied to time-reversal of counting processes. We are able to extend some of these results to pure jump processes with different jump-sizes, in particular we are able to compare the reciprocal classes of Markov pure jump processes through a functional equation between the jump-intensities. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 1(2012)26 KW - Duality formula KW - reciprocal class KW - Levy process KW - infinite divisibility KW - counting process KW - Malliavin calculus Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-63018 ER - TY - INPR A1 - Michaelis, Beatrice A1 - Dietze, Gabriele A1 - Yekani, Elahe Haschemi T1 - The queerness of things not queer - entgrenzungen - Affekte und Materialitäten - Interventionen T2 - Feministische Studien : Zeitschrift für interdisziplinäre Frauen- und Geschlechterforschung Y1 - 2012 SN - 0723-5186 VL - 30 IS - 2 SP - 184 EP - 197 PB - Lucius & Lucius CY - Stuttgart ER - TY - INPR A1 - Mayer, Frank T1 - Frequency of sport injuries and stress-related conditions in top-class Sport T2 - Der Orthopäde Y1 - 2012 U6 - https://doi.org/10.1007/s00132-012-1971-2 SN - 0085-4530 VL - 41 IS - 7 SP - 560 EP - 560 PB - Springer CY - New York ER - TY - INPR A1 - Lenhard, Michael T1 - Plant Growth: Jogging the Cell Cycle with JAG T2 - Current biology Y1 - 2012 U6 - https://doi.org/10.1016/j.cub.2012.07.033 SN - 0960-9822 VL - 22 IS - 19 SP - R838 EP - R840 PB - Cell Press CY - Cambridge ER - TY - INPR A1 - Lenhard, Michael T1 - All's well that ends well arresting cell proliferation in leaves T2 - Developmental cell N2 - The transition from cell proliferation to cell expansion is critical for determining leaf size. Andriankaja et al. (2012) demonstrate that in leaves of dicotyledonous plants, a basal proliferation zone is maintained for several days before abruptly disappearing, and that chloroplast differentiation is required to trigger the onset of cell expansion. Y1 - 2012 U6 - https://doi.org/10.1016/j.devcel.2011.12.004 SN - 1534-5807 VL - 22 IS - 1 SP - 9 EP - 11 PB - Cell Press CY - Cambridge ER -