TY - INPR A1 - Hipp, Lena A1 - Leumann, Sandra A1 - Schober, Pia S. T1 - Partnership penalties for working in gender-atypical occupations? BT - observational and experimental evidence from Germany N2 - Does working in a gender-atypical occupation reduce individuals’ likelihood of finding a different-sex romantic partner, and do such occupational partnership penalties contribute to occupational gender segregation? To answer this question, we theorized partnership penalties for working in gender-atypical occupations by drawing on insights from evolutionary psychology, social constructivism, and rational choice theory and exploited the stability of occupational pathways in Germany. In Study 1, we analyzed observational data from a national probability sample (N= 1,634,944) to assess whether individuals in gender-atypical occupations were less likely to be partnered than individuals who worked in gender typical occupations. To assess whether the observed partnership gaps found in Study 1 were causally related to the gender typicality of men’s and women’s occupations, we conducted a field experiment on a dating app (N = 6,778). Because the findings from Study 2 suggested that young women and men indeed experienced penalties for working in a gender-atypical occupation (at least when they were not highly attractive), we employed a choice-experimental design in Study 3 (N = 1,250) to assess whether women and men were aware of occupational partnership penalties and showed that anticipating occupational partnership penalties may keep young and highly educated women from working in gender-atypical occupations. Our main conclusion therefore is that that observed penalties and their anticipation seem to be driven by unconscious rather than conscious processes. KW - gender KW - occupational gender segregation KW - marriage KW - partnership KW - mating KW - dating KW - stereotypes KW - observational data KW - experiment Y1 - 2024 U6 - https://doi.org/10.31235/osf.io/ydurp ER - TY - INPR A1 - Eckstein, Lars A1 - Hurley, Andrew Wright T1 - German-Australian Colonial Entanglements BT - On German Settler Colonialism, the Wavering Interests of Exploration, Science, Mission and Migration, and the Contestations of Travelling Memory N2 - Remembering German-Australian Colonial Entanglements emphatically promotes a critical and nuanced understanding of the complex entanglement of German colonial actors and activities within Australian colonial institutions and different imperial ideologies. Case studies ranging from the German reception of James Cook’s voyages through to the legacies of 19th- and 20th-century settler colonialism foreground the highly ambiguous roles played by explorers, missionaries, intellectuals and other individuals, as well as by objects and things that travelled between worlds – ancestral human remains, rare animal skins, songs, and even military tanks. The chapters foreground the complex relationship between science, religion, art and exploitation, displacement and annihilation. Y1 - 2020 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-444490 ER - TY - INPR A1 - Fedchenko, Dmitry A1 - Tarkhanov, Nikolai Nikolaevich T1 - A Radó Theorem for the Porous Medium Equation T2 - Preprints des Instituts für Mathematik der Universität Potsdam N2 - We prove that each locally Lipschitz continuous function satisfying the porous medium equation away from the set of its zeroes is actually a weak solution of this equation in the whole domain. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 6 (2017) 1 KW - quasilinear equation KW - removable set KW - porous medium equation Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-102735 VL - 6 IS - 1 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Shlapunov, Alexander A1 - Tarkhanov, Nikolai Nikolaevich T1 - Golusin-Krylov Formulas in Complex Analysis T2 - Preprints des Instituts für Mathematik der Universität Potsdam N2 - This is a brief survey of a constructive technique of analytic continuation related to an explicit integral formula of Golusin and Krylov (1933). It goes far beyond complex analysis and applies to the Cauchy problem for elliptic partial differential equations as well. As started in the classical papers, the technique is elaborated in generalised Hardy spaces also called Hardy-Smirnov spaces. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 6 (2017) 2 KW - analytic continuation KW - integral formulas KW - Cauchy problem Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-102774 VL - 6 IS - 2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Polkovnikov, Alexander A1 - Tarkhanov, Nikolai Nikolaevich T1 - A Riemann-Hilbert problem for the Moisil-Teodorescu system N2 - In a bounded domain with smooth boundary in R^3 we consider the stationary Maxwell equations for a function u with values in R^3 subject to a nonhomogeneous condition (u,v)_x = u_0 on the boundary, where v is a given vector field and u_0 a function on the boundary. We specify this problem within the framework of the Riemann-Hilbert boundary value problems for the Moisil-Teodorescu system. This latter is proved to satisfy the Shapiro-Lopaniskij condition if an only if the vector v is at no point tangent to the boundary. The Riemann-Hilbert problem for the Moisil-Teodorescu system fails to possess an adjoint boundary value problem with respect to the Green formula, which satisfies the Shapiro-Lopatinskij condition. We develop the construction of Green formula to get a proper concept of adjoint boundary value problem. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 6 (2017) 3 KW - Dirac operator KW - Riemann-Hilbert problem KW - Fredholm operators Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-397036 VL - 6 IS - 3 ER - TY - INPR A1 - Eckstein, Lars T1 - Sam Selvon, The Lonely Londoners (1956) N2 - This essay reads Sam Selvon’s novel The Lonely Londoners (1956) as a milestone in the decolonisation of British fiction. After an introduction to Selvon and the core composition of the novel, it discusses the ways in which the narrative takes on issues of race and racism, how it in the tradition of the Trinidadian carnival confronts audiences with sexual profanation and black masculine swagger, and not least how the novel, especially through its elaborate use of creole Englishes, reimagines London as a West Indian metropolis. The essay then turns more systematically to the ways in which Selvon translates Western literary models and their isolated subject positions into collective modes of narrative performance taken from Caribbean orature and the calypsonian tradition. The Lonely Londoners breathes entirely new life into the ossified conventions of the English novel, and imbues it with unforeseen aesthetic, ethical, political and epistemological possibilities. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103285 ER - TY - INPR A1 - Shlapunov, Alexander A1 - Tarkhanov, Nikolai Nikolaevich T1 - An open mapping theorem for the Navier-Stokes equations N2 - We consider the Navier-Stokes equations in the layer R^n x [0,T] over R^n with finite T > 0. Using the standard fundamental solutions of the Laplace operator and the heat operator, we reduce the Navier-Stokes equations to a nonlinear Fredholm equation of the form (I+K) u = f, where K is a compact continuous operator in anisotropic normed Hölder spaces weighted at the point at infinity with respect to the space variables. Actually, the weight function is included to provide a finite energy estimate for solutions to the Navier-Stokes equations for all t in [0,T]. On using the particular properties of the de Rham complex we conclude that the Fréchet derivative (I+K)' is continuously invertible at each point of the Banach space under consideration and the map I+K is open and injective in the space. In this way the Navier-Stokes equations prove to induce an open one-to-one mapping in the scale of Hölder spaces. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016)10 KW - Navier-Stokes equations KW - weighted Hölder spaces KW - integral representation method Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-98687 SN - 2193-6943 VL - 5 IS - 10 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Blanchard, Gilles A1 - Krämer, Nicole T1 - Convergence rates of kernel conjugate gradient for random design regression N2 - We prove statistical rates of convergence for kernel-based least squares regression from i.i.d. data using a conjugate gradient algorithm, where regularization against overfitting is obtained by early stopping. This method is related to Kernel Partial Least Squares, a regression method that combines supervised dimensionality reduction with least squares projection. Following the setting introduced in earlier related literature, we study so-called "fast convergence rates" depending on the regularity of the target regression function (measured by a source condition in terms of the kernel integral operator) and on the effective dimensionality of the data mapped into the kernel space. We obtain upper bounds, essentially matching known minimax lower bounds, for the L^2 (prediction) norm as well as for the stronger Hilbert norm, if the true regression function belongs to the reproducing kernel Hilbert space. If the latter assumption is not fulfilled, we obtain similar convergence rates for appropriate norms, provided additional unlabeled data are available. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 8 KW - nonparametric regression KW - reproducing kernel Hilbert space KW - conjugate gradient KW - partial least squares KW - minimax convergence rates Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-94195 SN - 2193-6943 VL - 5 IS - 8 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Prasse, Paul A1 - Gruben, Gerrit A1 - Machlika, Lukas A1 - Pevny, Tomas A1 - Sofka, Michal A1 - Scheffer, Tobias T1 - Malware Detection by HTTPS Traffic Analysis N2 - In order to evade detection by network-traffic analysis, a growing proportion of malware uses the encrypted HTTPS protocol. We explore the problem of detecting malware on client computers based on HTTPS traffic analysis. In this setting, malware has to be detected based on the host IP address, ports, timestamp, and data volume information of TCP/IP packets that are sent and received by all the applications on the client. We develop a scalable protocol that allows us to collect network flows of known malicious and benign applications as training data and derive a malware-detection method based on a neural networks and sequence classification. We study the method's ability to detect known and new, unknown malware in a large-scale empirical study. KW - machine learning KW - computer security Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100942 ER - TY - INPR A1 - Roelly, Sylvie A1 - Vallois, Pierre T1 - Convoluted Brownian motion BT - a semimartingale approach N2 - In this paper we analyse semimartingale properties of a class of Gaussian periodic processes, called convoluted Brownian motions, obtained by convolution between a deterministic function and a Brownian motion. A classical example in this class is the periodic Ornstein-Uhlenbeck process. We compute their characteristics and show that in general, they are neither Markovian nor satisfy a time-Markov field property. Nevertheless, by enlargement of filtration and/or addition of a one-dimensional component, one can in some case recover the Markovianity. We treat exhaustively the case of the bidimensional trigonometric convoluted Brownian motion and the higher-dimensional monomial convoluted Brownian motion. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 9 KW - periodic Gaussian process KW - periodic Ornstein-Uhlenbeck process KW - Markov-field property KW - enlargement of filtration Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-96339 SN - 2193-6943 VL - 5 IS - 9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Vasiliev, Serguei A1 - Tarkhanov, Nikolai Nikolaevich T1 - Construction of series of perfect lattices by layer superposition N2 - We construct a new series of perfect lattices in n dimensions by the layer superposition method of Delaunay-Barnes. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016)11 KW - lattice packing and covering KW - polyhedra and polytopes KW - regular figures KW - division of spaces Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-100591 SN - 2193-6943 VL - 5 IS - 11 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Eckstein, Lars T1 - Recollecting Bones BT - The Remains of German-Australian Colonial Entanglements N2 - In the same “guarded, roundabout and reticent way” which Lindsay Barrett invokes for Australian conversations about imperial injustice, Germans, too, must begin to more systematically explore, in Paul Gilroy’s words, “the connections and the differences between anti-semitism and anti-black and other racisms and asses[s] the issues that arise when it can no longer be denied that they interacted over a long time in what might be seen as Fascism’s intellectual, ethical and scientific pre-history” (Gilroy 1996: 26). In the meantime, we need to care for the dead. We need to return them, first, from the status of scientific objects to the status of ancestral human beings, and then progressively, and proactively, as close as possible to the care of those communities from whom they were stolen. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103278 ER - TY - INPR A1 - Eckstein, Lars T1 - Reflections of Lusáni Cissé BT - Imperial Images and Sentient Critique N2 - On the last sunny October weekend in 2015 I decided to cycle from my home in Berlin to the small town of Wünsdorf some 40 kilometres south of the city. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103196 ER - TY - INPR A1 - Eckstein, Lars T1 - Postcolonial Piracy N2 - Media piracy is a contested term in the academic as much as the public debate. It is used by the corporate industries as a synonym for the theft of protected media content with disastrous economic consequences. It is celebrated by technophile elites as an expression of freedom that ensures creativity as much as free market competition. Marxist critics and activists promote flapiracy as a subversive practice that undermines the capitalist world system and its structural injustices. Artists and entrepreneurs across the globe curse it as a threat to their existence, while many use pirate infrastructures and networks fundamentally for the production and dissemination of their art. For large sections of the population across the global South, piracy is simply the only means of accessing the medial flows of a progressively globalising planet. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103307 ER - TY - INPR A1 - Gairing, Jan A1 - Högele, Michael A1 - Kosenkova, Tetiana T1 - Transportation distances and noise sensitivity of multiplicative Lévy SDE with applications N2 - This article assesses the distance between the laws of stochastic differential equations with multiplicative Lévy noise on path space in terms of their characteristics. The notion of transportation distance on the set of Lévy kernels introduced by Kosenkova and Kulik yields a natural and statistically tractable upper bound on the noise sensitivity. This extends recent results for the additive case in terms of coupling distances to the multiplicative case. The strength of this notion is shown in a statistical implementation for simulations and the example of a benchmark time series in paleoclimate. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 2 KW - stochastic differential equations KW - multiplicative Lévy noise KW - Lévy type processes KW - heavy-tailed distributions KW - model selection KW - Wasserstein distance KW - time series Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86693 SN - 2193-6943 VL - 5 IS - 2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Fedchenko, Dmitry A1 - Tarkhanov, Nikolai Nikolaevich T1 - Boundary value problems for elliptic complexes N2 - The aim of this paper is to bring together two areas which are of great importance for the study of overdetermined boundary value problems. The first area is homological algebra which is the main tool in constructing the formal theory of overdetermined problems. And the second area is the global calculus of pseudodifferential operators which allows one to develop explicit analysis. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 3 KW - elliptic complexes KW - Fredholm property KW - index Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86705 SN - 2193-6943 VL - 5 IS - 3 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Alsaedy, Ammar A1 - Tarkhanov, Nikolai Nikolaevich T1 - A Hilbert boundary value problem for generalised Cauchy-Riemann equations N2 - We elaborate a boundary Fourier method for studying an analogue of the Hilbert problem for analytic functions within the framework of generalised Cauchy-Riemann equations. The boundary value problem need not satisfy the Shapiro-Lopatinskij condition and so it fails to be Fredholm in Sobolev spaces. We show a solvability condition of the Hilbert problem, which looks like those for ill-posed problems, and construct an explicit formula for approximate solutions. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 1 KW - Dirac operator KW - Clifford algebra KW - Riemann-Hilbert problem KW - Fredholm operator Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-86109 SN - 2193-6943 VL - 5 IS - 1 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Alsaedy, Ammar T1 - Variational primitive of a differential form N2 - In this paper we specify the Dirichlet to Neumann operator related to the Cauchy problem for the gradient operator with data on a part of the boundary. To this end, we consider a nonlinear relaxation of this problem which is a mixed boundary problem of Zaremba type for the p-Laplace equation. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 4 KW - Dirichlet-to-Neumann operator KW - Cauchy problem KW - p-Laplace operator KW - calculus of variations Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-89223 SN - 2193-6943 VL - 5 IS - 4 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Blanchard, Gilles A1 - Mücke, Nicole T1 - Optimal rates for regularization of statistical inverse learning problems N2 - We consider a statistical inverse learning problem, where we observe the image of a function f through a linear operator A at i.i.d. random design points X_i, superposed with an additional noise. The distribution of the design points is unknown and can be very general. We analyze simultaneously the direct (estimation of Af) and the inverse (estimation of f) learning problems. In this general framework, we obtain strong and weak minimax optimal rates of convergence (as the number of observations n grows large) for a large class of spectral regularization methods over regularity classes defined through appropriate source conditions. This improves on or completes previous results obtained in related settings. The optimality of the obtained rates is shown not only in the exponent in n but also in the explicit dependence of the constant factor in the variance of the noise and the radius of the source condition set. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 5 KW - statistical inverse problem KW - minimax rate KW - kernel method Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-89782 SN - 2193-6943 VL - 5 IS - 5 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Mera, Azal A1 - Tarkhanov, Nikolai Nikolaevich T1 - The Neumann problem after Spencer N2 - When trying to extend the Hodge theory for elliptic complexes on compact closed manifolds to the case of compact manifolds with boundary one is led to a boundary value problem for the Laplacian of the complex which is usually referred to as Neumann problem. We study the Neumann problem for a larger class of sequences of differential operators on a compact manifold with boundary. These are sequences of small curvature, i.e., bearing the property that the composition of any two neighbouring operators has order less than two. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 6 KW - elliptic complex KW - manifold with boundary KW - Hodge theory KW - Neumann problem Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-90631 SN - 2193-6943 VL - 5 IS - 6 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Dereudre, David A1 - Mazzonetto, Sara A1 - Roelly, Sylvie T1 - Exact simulation of Brownian diffusions with drift admitting jumps N2 - Using an algorithm based on a retrospective rejection sampling scheme, we propose an exact simulation of a Brownian diffusion whose drift admits several jumps. We treat explicitly and extensively the case of two jumps, providing numerical simulations. Our main contribution is to manage the technical difficulty due to the presence of two jumps thanks to a new explicit expression of the transition density of the skew Brownian motion with two semipermeable barriers and a constant drift. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 5 (2016) 7 KW - exact simulation method KW - skew Brownian motion KW - skew diffusion KW - Brownian motion with discontinuous drift Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-91049 SN - 2193-6943 VL - 5 IS - 7 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Eckstein, Lars A1 - Wiemann, Dirk A1 - Waller, Nicole A1 - Bartels, Anke T1 - Postcolonial Justice BT - An Introduction N2 - In July 2014, some of us participated in a handover ceremony of 14 ancestral remains to their Australian traditional owners, performed on the premises of the Charité Campus in Berlin. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103220 ER - TY - INPR A1 - Eckstein, Lars A1 - Reindfandt, Christoph T1 - Luhmann in da Contact Zone BT - Towards a Postcolonial Critique of Sociological Systems Theory N2 - Our aim in this contribution is to productively engage with the abstractions and complexities of Luhmann’s conceptions of society from a postcolonial perspective, with a particular focus on the explanatory powers of his sociological systems theory when it leaves the realms of Europe and ventures to describe regions of the global South. In view of its more recent global reception beyond Europe, our aim is to thus – following the lead of Dipesh Chakrabarty – provincialize Luhmann’s system theory especially with regard to its underlying assumptions about a global “world society”. For these purposes, we intend to revisit Luhmann in the post/colonial contact zone: We wish to reread Luhmann in the context of spaces of transcultural encounter where “global designs and local histories” (Mignolo), where inclusion into and exclusion from “world society” (Luhmann) clash and interact in intricate ways. The title of our contribution, ‘Luhmann in da Contact Zone’ is deliberately ambiguous: On the one hand, we of course use ‘Luhmann’ metonymically, as representative of a highly complex theoretical design. We shall cursorily outline this design with a special focus on the notion of a singular, modern “world society”, only to confront it with the epistemic challenges of the contact zone. On the other hand, this critique will also involve the close observation of Niklas Luhman as a human observer (a category which within the logic of systems theory actually does not exist) who increasingly transpires in his late writings on exclusion in the global South. By following this dual strategy, we wish to trace an increasing fracture between one Luhmann and the other, between abstract theoretical design and personalized testimony. It is by exploring and measuring this fracture that we hope to eventually be able to map out the potential of a possibly more productive encounter between systems theory and specific strands of postcolonial theory for a pluritopic reading of global modernity. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-103298 ER - TY - INPR A1 - Ly, Ibrahim A1 - Tarkhanov, Nikolai Nikolaevich T1 - A Radó theorem for p-harmonic functions N2 - Let A be a nonlinear differential operator on an open set X in R^n and S a closed subset of X. Given a class F of functions in X, the set S is said to be removable for F relative to A if any weak solution of A (u) = 0 in the complement of S of class F satisfies this equation weakly in all of X. For the most extensively studied classes F we show conditions on S which guarantee that S is removable for F relative to A. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 3 KW - Quasilinear equations KW - removable sets KW - p-Laplace Operator Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-71492 SN - 2193-6943 VL - 4 IS - 3 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Ly, Ibrahim A1 - Tarkhanov, Nikolai Nikolaevich T1 - Asymptotic expansions at nonsymmetric cuspidal points N2 - We study asymptotics of solutions to the Dirichlet problem in a domain whose boundary contains a nonsymmetric conical point. We establish a complete asymptotic expansion of solutions near the singular point. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 7 KW - the Dirichlet problem KW - singular point KW - asymptotic expansion Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-78199 SN - 2193-6943 VL - 4 IS - 7 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Fedosov, Boris A1 - Tarkhanov, Nikolai Nikolaevich T1 - Deformation quantisation and boundary value problems N2 - We describe a natural construction of deformation quantisation on a compact symplectic manifold with boundary. On the algebra of quantum observables a trace functional is defined which as usual annihilates the commutators. This gives rise to an index as the trace of the unity element. We formulate the index theorem as a conjecture and examine it by the classical harmonic oscillator. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 5 KW - symplectic manifold KW - star product KW - trace KW - index Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-77150 SN - 2193-6943 VL - 4 IS - 5 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Elin, Mark A1 - Shoikhet, David A1 - Tarkhanov, Nikolai Nikolaevich T1 - Analytic semigroups of holomorphic mappings and composition operators N2 - In this paper we study the problem of analytic extension in parameter for a semigroup of holomorphic self-mappings of the unit ball in a complex Banach space and its relation to the linear continuous semigroup of composition operators. We also provide a brief review around this topic. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 6 KW - nonlinear semigroup KW - composition operator Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-77914 SN - 2193-6943 VL - 4 IS - 6 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Conforti, Giovanni A1 - Roelly, Sylvie T1 - Reciprocal class of random walks on an Abelian group N2 - Processes having the same bridges as a given reference Markov process constitute its reciprocal class. In this paper we study the reciprocal class of a continuous time random walk with values in a countable Abelian group, we compute explicitly its reciprocal characteristics and we present an integral characterization of it. Our main tool is a new iterated version of the celebrated Mecke's formula from the point process theory, which allows us to study, as transformation on the path space, the addition of random loops. Thanks to the lattice structure of the set of loops, we even obtain a sharp characterization. At the end, we discuss several examples to illustrate the richness of reciprocal classes. We observe how their structure depends on the algebraic properties of the underlying group. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 1 KW - reciprocal class KW - stochastic bridge KW - random walk on Abelian group Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-72604 SN - 2193-6943 VL - 4 IS - 1 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Alsaedy, Ammar A1 - Tarkhanov, Nikolai Nikolaevich T1 - Weak boundary values of solutions of Lagrangian problems N2 - We define weak boundary values of solutions to those nonlinear differential equations which appear as Euler-Lagrange equations of variational problems. As a result we initiate the theory of Lagrangian boundary value problems in spaces of appropriate smoothness. We also analyse if the concept of mapping degree of current importance applies to the study of Lagrangian problems. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 2 KW - nonlinear equations KW - Lagrangian system KW - weak boundary values KW - quasilinear Fredholm operator KW - mapping degree Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-72617 SN - 2193-6943 VL - 4 IS - 2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Tarkhanov, Nikolai Nikolaevich T1 - A spectral theorem for deformation quantisation N2 - We present a construction of the eigenstate at a noncritical level of the Hamiltonian function. Moreover, we evaluate the contributions of Morse critical points to the spectral decomposition. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 4 KW - star product KW - WKB method KW - spectral theorem Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-72425 SN - 2193-6943 VL - 4 IS - 4 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Seelaender, Marilia A1 - Laviano, A. A1 - Busquets, S. A1 - Püschel, Gerhard Paul A1 - Margaria, T. A1 - Batista Jr., Miguel Luiz T1 - Inflammation in Cachexia T2 - Mediators of inflammation Y1 - 2015 U6 - https://doi.org/10.1155/2015/536954 SN - 0962-9351 SN - 1466-1861 PB - Hindawi Publishing Corp. CY - New York ER - TY - INPR A1 - Abutalebi, Jubin A1 - Clahsen, Harald T1 - Bilingualism, cognition, and aging T2 - Bilingualism : language and cognition. N2 - Extract: Topics in psycholinguistics and the neurocognition of language rarely attract the attention of journalists or the general public. One topic that has done so, however, is the potential benefits of bilingualism for general cognitive functioning and development, and as a precaution against cognitive decline in old age. Sensational claims have been made in the public domain, mostly by journalists and politicians. Recently (September 4, 2014) The Guardian reported that “learning a foreign language can increase the size of your brain”, and Michael Gove, the UK's previous Education Secretary, noted in an interview with The Guardian (September 30, 2011) that “learning languages makes you smarter”. The present issue of BLC addresses these topics by providing a state-of-the-art overview of theoretical and experimental research on the role of bilingualism for cognition in children and adults. Y1 - 2015 U6 - https://doi.org/10.1017/S1366728914000741 SN - 1366-7289 SN - 1469-1841 VL - 18 IS - 1 SP - 1 EP - 2 PB - Cambridge Univ. Press CY - New York ER - TY - INPR A1 - Megow, Jörg A1 - Körzdörfer, Thomas A1 - Renger, Thomas A1 - Sparenberg, Mino A1 - Blumstengel, Sylke A1 - May, Volkhard T1 - Reply to "Comment on 'Calculating Optical Absorption Spectra of Thin Polycrystalline Organic Films: Structural Disorder and Site-Dependent van der Waals Interaction" T2 - The journal of physical chemistry : C, Nanomaterials and interfaces Y1 - 2015 U6 - https://doi.org/10.1021/acs.jpcc.5b05536 SN - 1932-7447 VL - 119 IS - 32 SP - 18818 EP - 18820 PB - American Chemical Society CY - Washington ER - TY - INPR A1 - Kohler, Ulrich T1 - Maintaining quality T2 - Survey research methods N2 - Survey Research Methods has slightly revised its publication policies. Firstly, starting with the publication of this Editorial, SRM will accept - under specified conditions - manuscripts that discuss experiments in non-probability samples for peer-review. Secondly, SRM will require authors to publish replication materials of their study as Online supplement to their article. Finally, Survey Research Methods will publish replication studies of articles published in the journal. This Editorial gives reasons for these changes. KW - Editorial policies KW - non-probability samples KW - experiments KW - TOP-Guidelines Y1 - 2015 SN - 1864-3361 VL - 9 IS - 3 SP - 139 EP - 140 PB - European Survey Research Association CY - Duisburg ER - TY - INPR A1 - Jacob, Gunnar T1 - The L2 decomposition of transparent derived verbs - Is it 'morphological'? A commentary on De Grauwe, Lemhofer, Willems, & Schriefers (2014) T2 - Frontiers in human neuroscienc KW - morphological processing KW - derivational affixes KW - decomposition KW - non-native speakers Y1 - 2015 U6 - https://doi.org/10.3389/fnhum.2015.00220 SN - 1662-5161 VL - 9 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Pousttchi, Key A1 - Tilson, David A1 - Lyytinen, Kalle A1 - Hufenbach, Yvonne T1 - Introduction to the Special Issue on Mobile Commerce: Mobile Commerce Research Yesterday, Today, TomorrowWhat Remains to Be Done? T2 - International journal of electronic commerce N2 - Mobile commerce (m-commerce) in the smartphone age is revolutionizing established value networks and transforming the wider economy. In this introduction we strive to build a bridge from the past of m-commerce research to its future. We examine more than a decade of research and conduct a Delphi study among leading scholars in the field. The review reveals significant changes in m-commerce topics as time goes on, and provides initial insights into what the future may hold for us. The most sobering finding is that the m-commerce field has still to establish a strong theoretical foundation. This has been reflected in less than overwhelming success in publishing on the subject in the most prestigious journals of the Information Systems discipline. At the same time, m-commerce forms one of the epicenters of the ongoing digitalization of our life. Therefore, we look forward to m-commerce research rising to the challenge and making significant contributions to understanding one of the important phenomena of our time. KW - Delphi study KW - literature review KW - m-commerce KW - mobile commerce research Y1 - 2015 U6 - https://doi.org/10.1080/10864415.2015.1029351 SN - 1086-4415 SN - 1557-9301 VL - 19 IS - 4 SP - 1 EP - 20 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - INPR A1 - Fischer, Martin H. A1 - Shaki, Samuel T1 - Two steps to space for numbers T2 - Frontiers in psychology KW - spatial-nunmerical association KW - SNARC KW - mental number line KW - numerical cognition KW - spatial cognition Y1 - 2015 U6 - https://doi.org/10.3389/fpsyg.2015.00612 SN - 1664-1078 VL - 6 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Lindemann, Oliver A1 - Fischer, Martin H. T1 - Embodied number processing T2 - Journal of cognitive psychology Y1 - 2015 U6 - https://doi.org/10.1080/20445911.2015.1032295 SN - 2044-5911 SN - 2044-592X VL - 27 IS - 4 SP - 381 EP - 387 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - INPR A1 - Wang, Ping A1 - Scherler, Dirk A1 - Jing Liu-Zeng, A1 - Mey, Jürgen A1 - Avouac, Jean-Philippe A1 - Zhang, Yunda A1 - Shi, Dingguo T1 - GEOMORPHOLOGY Response to Comment on "Tectonic control of Yarlung Tsangpo Gorge revealed by a buried canyon in Southern Tibet" T2 - Science N2 - In their Comment, Zeitler et al. do not challenge our results or interpretation. Our study does not disprove coupling between tectonic uplift and erosion but suggests that this coupling cannot be the sole explanation of rapid uplift in the Himalayan syntaxes. Y1 - 2015 SN - 0036-8075 SN - 1095-9203 VL - 349 IS - 6250 PB - American Assoc. for the Advancement of Science CY - Washington ER - TY - INPR A1 - Kehr, Jan-Christoph A1 - Dittmann-Thünemann, Elke T1 - Protective tunicate endosymbiont with extreme genome reduction T2 - Environmental microbiology Y1 - 2015 U6 - https://doi.org/10.1111/1462-2920.12941 SN - 1462-2912 SN - 1462-2920 VL - 17 IS - 10 SP - 3430 EP - 3432 PB - Wiley-Blackwell CY - Hoboken ER - TY - INPR A1 - Baumann, Stefan A1 - Kügler, Frank T1 - Prosody and information status in typological perspective - Introduction to the Special Issue T2 - Lingua : international review of general linguistics Y1 - 2015 U6 - https://doi.org/10.1016/j.lingua.2015.08.001 SN - 0024-3841 SN - 1872-6135 VL - 165 SP - 179 EP - 182 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Shaki, Samuel A1 - Fischer, Martin H. T1 - Newborn chicks need no number tricks. Commentary: Number-space mapping in the newborn chick resembles humans' mental number line T2 - Frontiers in human neuroscienc KW - mental number line KW - innate number sense KW - numerical cognition KW - spatial cognition KW - spatial numerical associations Y1 - 2015 U6 - https://doi.org/10.3389/fnhum.2015.00451 SN - 1662-5161 VL - 9 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Petroczi, Andrea A1 - Backhouse, Susan H. A1 - Barkoukis, Vassilis A1 - Brand, Ralf A1 - Elbe, Anne-Marie A1 - Lazuras, Larnbros A1 - Lucidi, Fabio T1 - A call for policy guidance on psychometric testing in doping control in sport T2 - International journal of drug policy N2 - One of the fundamental challenges in anti-doping is identifying athletes who use, or are at risk of using, prohibited performance enhancing substances. The growing trend to employ a forensic approach to doping control aims to integrate information from social sciences (e.g., psychology of doping) into organised intelligence to protect clean sport. Beyond the foreseeable consequences of a positive identification as a doping user, this task is further complicated by the discrepancy between what constitutes a doping offence in the World Anti-Doping Code and operationalized in doping research. Whilst psychology plays an important role in developing our understanding of doping behaviour in order to inform intervention and prevention, its contribution to the array of doping diagnostic tools is still in its infancy. In both research and forensic settings, we must acknowledge that (1) socially desirable responding confounds self-reported psychometric test results and (2) that the cognitive complexity surrounding test performance means that the response-time based measures and the lie detector tests for revealing concealed life-events (e.g., doping use) are prone to produce false or non-interpretable outcomes in field settings. Differences in social-cognitive characteristics of doping behaviour that are tested at group level (doping users vs. non-users) cannot be extrapolated to individuals; nor these psychometric measures used for individual diagnostics. In this paper, we present a position statement calling for policy guidance on appropriate use of psychometric assessments in the pursuit of clean sport. We argue that, to date, both self-reported and response-time based psychometric tests for doping have been designed, tested and validated to explore how athletes feel and think about doping in order to develop a better understanding of doping behaviour, not to establish evidence for doping. A false 'positive' psychological profile for doping affects not only the individual 'clean' athlete but also their entourage, their organisation and sport itself. The proposed policy guidance aims to protect the global athletic community against social, ethical and legal consequences from potential misuse of psychological tests, including erroneous or incompetent applications as forensic diagnostic tools in both practice and research. (C) 2015 Elsevier B.V. All rights reserved. KW - Prohibited performance enhancement KW - Athlete KW - Drug KW - Anti-doping KW - Attitude Y1 - 2015 U6 - https://doi.org/10.1016/j.drugpo.2015.04.022 SN - 0955-3959 SN - 1873-4758 VL - 26 IS - 11 SP - 1130 EP - 1139 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Petroczi, Andrea A1 - Backhouse, Susan H. A1 - Barkoukis, Vassilis A1 - Brand, Ralf A1 - Elbe, Anne-Marie A1 - Lazuras, Lambros A1 - Lucidi, Fabio T1 - A matter of mind-set in the interpretation of forensic application T2 - International journal of drug policy Y1 - 2015 U6 - https://doi.org/10.1016/j.drugpo.2015.06.007 SN - 0955-3959 SN - 1873-4758 VL - 26 IS - 11 SP - 1142 EP - 1143 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Daviter, Falk T1 - The political use of knowledge in the policy process T2 - Policy sciences : integrating knowledge and practice to advance human dignity N2 - The role of knowledge in the policy process remains a central theoretical puzzle in policy analysis and political science. This article argues that an important yet missing piece of this puzzle is the systematic exploration of the political use of policy knowledge. While much of the recent debate has focused on the question of how the substantive use of knowledge can improve the quality of policy choices, our understanding of the political use of knowledge and its effects in the policy process has remained deficient in key respects. A revised conceptualization of the political use of knowledge is introduced that emphasizes how conflicting knowledge can be used to contest given structures of policy authority. This allows the analysis to differentiate between knowledge creep and knowledge shifts as two distinct types of knowledge effects in the policy process. While knowledge creep is associated with incremental policy change within existing policy structures, knowledge shifts are linked to more fundamental policy change in situations when the structures of policy authority undergo some level of transformation. The article concludes by identifying characteristics of the administrative structure of policy systems or sectors that make knowledge shifts more or less likely. KW - Evidence-based policy making KW - Knowledge creep KW - Knowledge utilization KW - Organizational epistemology KW - Punctuated equilibrium theory Y1 - 2015 U6 - https://doi.org/10.1007/s11077-015-9232-y SN - 0032-2687 SN - 1573-0891 VL - 48 IS - 4 SP - 491 EP - 505 PB - Springer CY - Dordrecht ER - TY - INPR A1 - Oliveto, Pietro S. A1 - Sutton, Andrew M. T1 - Editorial for the Special Issue on Theory of Evolutionary Algorithms 2014 T2 - Evolutionary computation Y1 - 2015 U6 - https://doi.org/10.1162/EVCO_e_00165 SN - 1063-6560 SN - 1530-9304 VL - 23 IS - 4 SP - 509 EP - 511 PB - MIT Press CY - Cambridge ER - TY - INPR A1 - Makhmudov, K. O. A1 - Makhmudov, O. I. A1 - Tarkhanov, Nikolai Nikolaevich T1 - A nonstandard Cauchy problem for the heat equation N2 - We consider a Cauchy problem for the heat equation in a cylinder X x (0,T) over a domain X in the n-dimensional space with data on a strip lying on the lateral surface. The strip is of the form S x (0,T), where S is an open subset of the boundary of X. The problem is ill-posed. Under natural restrictions on the configuration of S we derive an explicit formula for solutions of this problem. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015)11 KW - heat equation KW - Cauchy problem KW - Carleman formulas Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-83830 SN - 2193-6943 VL - 4 IS - 11 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Mera, Azal A1 - Shlapunov, Alexander A1 - Tarkhanov, Nikolai Nikolaevich T1 - Navier-Stokes equations for elliptic complexes N2 - We continue our study of invariant forms of the classical equations of mathematical physics, such as the Maxwell equations or the Lamé system, on manifold with boundary. To this end we interpret them in terms of the de Rham complex at a certain step. On using the structure of the complex we get an insight to predict a degeneracy deeply encoded in the equations. In the present paper we develop an invariant approach to the classical Navier-Stokes equations. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015)12 KW - Navier-Stokes equations KW - classical solution Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-85592 SN - 2193-6943 VL - 4 IS - 12 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Conforti, Giovanni T1 - Reciprocal classes of continuous time Markov Chains N2 - In this work we study reciprocal classes of Markov walks on graphs. Given a continuous time reference Markov chain on a graph, its reciprocal class is the set of all probability measures which can be represented as a mixture of the bridges of the reference walks. We characterize reciprocal classes with two different approaches. With the first approach we found it as the set of solutions to duality formulae on path space, where the differential operators have the interpretation of the addition of infinitesimal random loops to the paths of the canonical process. With the second approach we look at short time asymptotics of bridges. Both approaches allow an explicit computation of reciprocal characteristics, which are divided into two families, the loop characteristics and the arc characteristics. They are those specific functionals of the generator of the reference chain which determine its reciprocal class. We look at the specific examples such as Cayley graphs, the hypercube and planar graphs. Finally we establish the first concentration of measure results for the bridges of a continuous time Markov chain based on the reciprocal characteristics. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 8 KW - random walks on graphs KW - bridges of random walks KW - reciprocal characteristics KW - Schrödinger problem KW - integration by parts on path space Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-78234 SN - 2193-6943 VL - 4 IS - 8 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Gibali, Aviv A1 - Shoikhet, David A1 - Tarkhanov, Nikolai Nikolaevich T1 - On the convergence of continuous Newton method N2 - In this paper we study the convergence of continuous Newton method for solving nonlinear equations with holomorphic mappings in complex Banach spaces. Our contribution is based on a recent progress in the geometric theory of spirallike functions. We prove convergence theorems and illustrate them by numerical simulations. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015)10 KW - Newton method KW - spirallike function Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-81537 SN - 2193-6943 VL - 4 IS - 10 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Hagelberg, Erika A1 - Hofreiter, Michael A1 - Keyser, Christine T1 - Ancient DNA: the first three decades T2 - Philosophical transactions of the Royal Society of London : B, Biological sciences KW - ancient DNA KW - human evolutionary genetics KW - palaeogenomics Y1 - 2015 U6 - https://doi.org/10.1098/rstb.2013.0371 SN - 0962-8436 SN - 1471-2970 VL - 370 IS - 1660 PB - Royal Society CY - London ER - TY - INPR A1 - Mischke, Steffen A1 - Madsen, David A1 - Zhang, Chengjun A1 - Lai, Zhongping T1 - Reply to comment by Zhang (2014): The Shell Bar in the Qaidam Basin: fluvial or lake deposit, and OSL versus C-14 age data T2 - Journal of paleolimnolog Y1 - 2015 U6 - https://doi.org/10.1007/s10933-014-9817-z SN - 0921-2728 SN - 1573-0417 VL - 53 IS - 3 SP - 335 EP - 344 PB - Springer CY - Dordrecht ER - TY - INPR A1 - Fischer, Martin H. A1 - Sixtus, Elena A1 - Göbel, Silke M. T1 - Commentary: A pointer about grasping numbers T2 - Frontiers in psychology KW - numerical cognition KW - embodied cognition KW - gestures KW - numeracy training KW - mathematical cognition Y1 - 2015 U6 - https://doi.org/10.3389/fpsyg.2015.00227 VL - 6 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Pikovskij, Arkadij T1 - Comment on "Asymptotic Phase for Stochastic Oscillators" T2 - Physical review letters Y1 - 2015 U6 - https://doi.org/10.1103/PhysRevLett.115.069401 SN - 0031-9007 SN - 1079-7114 VL - 115 IS - 6 PB - American Physical Society CY - College Park ER - TY - INPR A1 - Julich-Gruner, Konstanze K. A1 - Pandit, Abhay A1 - Lendlein, Andreas T1 - Advanced Functional Polymers Addressing the Needs of Modern Medicine T2 - Macromolecular rapid communications Y1 - 2015 U6 - https://doi.org/10.1002/marc.201500575 SN - 1022-1336 SN - 1521-3927 VL - 36 IS - 21 SP - 1859 EP - 1861 PB - Wiley-VCH CY - Weinheim ER - TY - INPR A1 - Dereudre, David A1 - Mazzonetto, Sara A1 - Roelly, Sylvie T1 - An explicit representation of the transition densities of the skew Brownian motion with drift and two semipermeable barriers N2 - In this paper we obtain an explicit representation of the transition density of the one-dimensional skew Brownian motion with (a constant drift and) two semipermeable barriers. Moreover we propose a rejection method to simulate this density in an exact way. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 4 (2015) 9 KW - skew Brownian motion KW - semipermeable barriers KW - distorted Brownian motion KW - local time KW - rejection sampling KW - exact simulation Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus4-80613 SN - 2193-6943 VL - 4 IS - 9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Leroux, Fabrice A1 - Rabu, Pierre A1 - Sommerdijk, Nico A. J. M. A1 - Taubert, Andreas T1 - Hybrid Materials Engineering in Biology, Chemistry, and Physics T2 - European journal of inorganic chemistry : a journal of ChemPubSoc Europe N2 - The Guest Editors emphasize the rapidly growing research in advanced materials.Telecommunication, health and environment, energy and transportation, and sustainability are just a few examples where new materials have been key for technological advancement. Y1 - 2015 U6 - https://doi.org/10.1002/ejic.201500098 SN - 1434-1948 SN - 1099-0682 IS - 7 SP - 1086 EP - 1088 PB - Wiley-VCH CY - Weinheim ER - TY - INPR A1 - Chattopadhyay, Madhab K. A1 - Chakraborty, Ranadhir A1 - Grossart, Hans-Peter A1 - Reddy, Gundlapally S. A1 - Jagannadham, Medicharla V. T1 - Antibiotic resistance of bacteria T2 - BioMed research international Y1 - 2015 U6 - https://doi.org/10.1155/2015/501658 SN - 2314-6133 SN - 2314-6141 PB - Hindawi Publishing Corp. CY - New York ER - TY - INPR A1 - Ensslin, Andreas A1 - Tschoepe, Okka A1 - Burkart, Michael A1 - Joshi, Jasmin Radha T1 - Fitness decline and adaptation to novel environments in ex situ plant collections: Current knowledge and future perspectives T2 - : an international journal N2 - The conservation of rare plant species as living collections in botanic gardens and arboreta has become an established tool in the battle against worldwide species' extinctions. However, the establishment of ex situ collections with a high conservation value requires a sound understanding of the evolutionary processes that may reduce the suitability of these collections for future reintroductions. Particularly, risks such as fitness decline of cultivated plants over time, trait shifts and loss of adaptation to the original habitat due to changes in selection regimes have rarely been addressed so far. Based on a literature review and results of our own project we show that genetic drift can lead to fitness decline in ex situ cultivated plants, but these drift effects strongly depend on the conditions and cultivation history in the ex situ facility. Furthermore, we provide evidence that shifts in traits such as germination and flowering time, and a decrease in stress tolerance to drought and competition can reduce the conservation value of ex situ collections. These threats associated with ex situ conditions require more attention by researchers, curators and conservationists. We need to increase knowledge on traits that are subject to novel selection pressures in ex situ collections, and to define population sizes that prevent genetic drift. Establishing conservation networks with replicated collections across gardens and balancing the seed contribution of mother plants to the next generation within a collection are suggested as first steps to increase the conservation value of ex situ plant collections. (C) 2015 Elsevier Ltd. All rights reserved. KW - Ex situ conservation KW - Botanic gardens KW - Artificial selection KW - Genetic drift KW - Adaptive evolution Y1 - 2015 U6 - https://doi.org/10.1016/j.biocon.2015.10.012 SN - 0006-3207 SN - 1873-2917 VL - 192 SP - 394 EP - 401 PB - Elsevier CY - Oxford ER - TY - INPR A1 - Heinz, Andreas A1 - Charlet, Katrin A1 - Rapp, Michael A. T1 - Public mental health: a call to action T2 - World psychiatry Y1 - 2015 U6 - https://doi.org/10.1002/wps.20182 SN - 1723-8617 SN - 2051-5545 VL - 14 IS - 1 SP - 49 EP - 50 PB - Wiley-Blackwell CY - Hoboken ER - TY - INPR A1 - Fedchenko, Dmitry A1 - Tarkhanov, Nikolai Nikolaevich T1 - An index formula for Toeplitz operators N2 - We prove a Fedosov index formula for the index of Toeplitz operators connected with the Hardy space of solutions to an elliptic system of first order partial differential equations in a bounded domain of Euclidean space with infinitely differentiable boundary. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3(2014)12 KW - Toeplitz operators KW - Fredholm property KW - index Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-72499 SN - 2193-6943 VL - 3 IS - 12 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Sultanov, Oskar A1 - Kalyakin, Leonid A1 - Tarkhanov, Nikolai Nikolaevich T1 - Elliptic perturbations of dynamical systems with a proper node N2 - The paper is devoted to asymptotic analysis of the Dirichlet problem for a second order partial differential equation containing a small parameter multiplying the highest order derivatives. It corresponds to a small perturbation of a dynamical system having a stationary solution in the domain. We focus on the case where the trajectories of the system go into the domain and the stationary solution is a proper node. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 4 KW - dynamical system KW - singular perturbation KW - asymptotic methods Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-70460 SN - 2193-6943 VL - 3 IS - 4 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Conforti, Giovanni A1 - Léonard, Christian A1 - Murr, Rüdiger A1 - Roelly, Sylvie T1 - Bridges of Markov counting processes : reciprocal classes and duality formulas N2 - Processes having the same bridges are said to belong to the same reciprocal class. In this article we analyze reciprocal classes of Markov counting processes by identifying their reciprocal invariants and we characterize them as the set of counting processes satisfying some duality formula. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 9 KW - counting process KW - bridge KW - reciprocal class KW - duality formula Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-71855 SN - 2193-6943 VL - 3 IS - 9 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Flandoli, Franco A1 - Högele, Michael T1 - A solution selection problem with small stable perturbations N2 - The zero-noise limit of differential equations with singular coefficients is investigated for the first time in the case when the noise is a general alpha-stable process. It is proved that extremal solutions are selected and the probability of selection is computed. Detailed analysis of the characteristic function of an exit time form on the half-line is performed, with a suitable decomposition in small and large jumps adapted to the singular drift. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 8 KW - stochastic differential equations KW - singular drifts KW - zero-noise limit KW - Peano phenomena KW - non-uniqueness Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-71205 SN - 2193-6943 VL - 3 IS - 8 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Schlaad, Helmut T1 - Thiol-X chemistry in polymer science T2 - Polymer : the international journal for the science and technology of polymers Y1 - 2014 U6 - https://doi.org/10.1016/j.polymer.2014.09.020 SN - 0032-3861 SN - 1873-2291 VL - 55 IS - 22 SP - 5509 EP - 5510 PB - Elsevier CY - Oxford ER - TY - INPR A1 - Baudis, Stefan A1 - Behl, Marc A1 - Lendlein, Andreas T1 - Smart polymers for biomedical applications T2 - Macromolecular chemistry and physics Y1 - 2014 U6 - https://doi.org/10.1002/macp.201400561 SN - 1022-1352 SN - 1521-3935 VL - 215 IS - 24 SP - 2399 EP - 2402 PB - Wiley-VCH CY - Weinheim ER - TY - INPR A1 - Henkel, Carsten A1 - Pieplow, Gregor T1 - Reply to Comment on 'Fully covariant radiation force on a polarizable particle' T2 - New journal of physics : the open-access journal for physics N2 - We argue that the theories of Volokitin and Persson (2014 New J. Phys. 16 118001), Dedkov and Kyasov (2008 J. Phys.: Condens. Matter 20 354006), and Pieplow and Henkel (2013 New J. Phys. 15 023027) agree on the electromagnetic force on a small, polarizable particle that is moving parallel to a planar, macroscopic body, as far as the contribution of evanescent waves is concerned. The apparent differences are discussed in detail and explained by choices of units and integral transformations. We point out in particular the role of the Lorentz contraction in the procedure used by Volokitin and Persson, where a macroscopic body is 'diluted' to obtain the force on a small particle. Differences that appear in the contribution of propagating photons are briefly mentioned. KW - applied classical electromagnetism KW - fluctuation phenomena KW - random processes KW - noise KW - Brownian motion KW - mechanical effects of light Y1 - 2014 U6 - https://doi.org/10.1088/1367-2630/16/11/118002 SN - 1367-2630 VL - 16 PB - IOP Publ. Ltd. CY - Bristol ER - TY - INPR A1 - Freundt, A. A1 - Halama, Ralf A1 - Suess, E. A1 - Voelker, D. T1 - Introduction to the special issue on SFB 574 "Volatiles and fluids in subduction zones: climate feedback and trigger mechanisms for natural disasters" T2 - International journal of earth sciences Y1 - 2014 U6 - https://doi.org/10.1007/s00531-014-1059-9 SN - 1437-3254 SN - 1437-3262 VL - 103 IS - 7 SP - 1729 EP - 1731 PB - Springer CY - New York ER - TY - INPR A1 - Schwarz, Wolfgang A1 - Miller, Jeff O. T1 - When less equals more: probability summation without sensitivity improvement T2 - Journal of experimental psychology : Human perception and performance N2 - Many perceptual and cognitive tasks permit or require the integrated cooperation of specialized sensory channels, detectors, or other functionally separate units. In compound detection or discrimination tasks, 1 prominent general mechanism to model the combination of the output of different processing channels is probability summation. The classical example is the binocular summation model of Pirenne (1943), according to which a weak visual stimulus is detected if at least 1 of the 2 eyes detects this stimulus; as we review briefly, exactly the same reasoning is applied in numerous other fields. It is generally accepted that this mechanism necessarily predicts performance based on 2 (or more) channels to be superior to single channel performance, because 2 separate channels provide "2 chances" to succeed with the task. We argue that this reasoning is misleading because it neglects the increased opportunity with 2 channels not just for hits but also for false alarms and that there may well be no redundancy gain at all when performance is measured in terms of receiver operating characteristic curves. We illustrate and support these arguments with a visual detection experiment involving different spatial uncertainty conditions. Our arguments and findings have important implications for all models that, in one way or another, rest on, or incorporate, the notion of probability summation for the analysis of detection tasks, 2-alternative forced-choice tasks, and psychometric functions. KW - probability summation KW - compound detection or discrimination KW - redundancy gain KW - ROC curve KW - 2AFC KW - psychometric functions Y1 - 2014 U6 - https://doi.org/10.1037/a0037548 SN - 0096-1523 SN - 1939-1277 VL - 40 IS - 5 SP - 2091 EP - 2100 PB - American Psychological Association CY - Washington ER - TY - INPR A1 - Lucke, Ulrike A1 - Steinmetz, Ralf T1 - Special issue on "Pervasive Education" T2 - Pervasive and mobile computing Y1 - 2014 U6 - https://doi.org/10.1016/j.pmcj.2014.08.001 SN - 1574-1192 SN - 1873-1589 VL - 14 SP - 1 EP - 2 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Fischer, Martin H. A1 - Shaki, Samuel T1 - Spatial biases in mental arithmetic T2 - The quarterly journal of experimental psychology Y1 - 2014 U6 - https://doi.org/10.1080/17470218.2014.927516 SN - 1747-0218 SN - 1747-0226 VL - 67 IS - 8 SP - 1457 EP - 1460 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - INPR A1 - Rehman, Hafiz Ur A1 - Tsujimori, Tatsuki A1 - Okamoto, Kazuaki A1 - Spengler, Dirk T1 - Petrogenesis and chemogenesis of oceanic and continental orogens in Asia: Current topics, Part I Preface T2 - The island arc Y1 - 2014 U6 - https://doi.org/10.1111/iar.12097 SN - 1038-4871 SN - 1440-1738 VL - 23 IS - 4 SP - 251 EP - 253 PB - Wiley-Blackwell CY - Hoboken ER - TY - INPR A1 - Shaki, Samuel A1 - Fischer, Martin H. T1 - Removing spatial responses reveals spatial concepts even in a culture with mixed reading habits T2 - Frontiers in human neuroscienc KW - cross-cultural KW - random number generation KW - mental number line KW - embodied numerical cognition KW - automatic processing Y1 - 2014 U6 - https://doi.org/10.3389/fnhum.2014.00966 SN - 1662-5161 VL - 8 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Fischer, Martin H. A1 - Knops, Andre T1 - Attentional cueing in numerical cognition T2 - Frontiers in psychology KW - attention KW - number line KW - SNARC effect KW - visual perception KW - response selection Y1 - 2014 U6 - https://doi.org/10.3389/fpsyg.2014.01381 SN - 1664-1078 VL - 5 PB - Frontiers Research Foundation CY - Lausanne ER - TY - INPR A1 - Bürger, Gerd T1 - Comment on "Bias correction, quantile mapping, and downscaling: revisiting the inflation issue" T2 - Journal of climate N2 - In a recent paper, Maraun describes the adverse effects of quantile mapping on downscaling. He argues that when large-scale GCM variables are rescaled directly to small-scale fields or even station data, genuine small-scale covariability is lost and replaced by uniform variability inherited from the larger scales. This leads to a misrepresentation mainly of areal means and long-term trends. This comment acknowledges the former point, although the argument is relatively old, but disagrees with the latter, showing that grid-size long-term trends can be different from local trends. Finally, because it is partly incorrectly addressed, some clarification is added regarding the inflation issue, stressing that neither randomization nor inflation is free of unverified assumptions. KW - Climate change KW - Statistics KW - Climate variability Y1 - 2014 U6 - https://doi.org/10.1175/JCLI-D-13-00184.1 SN - 0894-8755 SN - 1520-0442 VL - 27 IS - 4 SP - 1819 EP - 1820 PB - American Meteorological Soc. CY - Boston ER - TY - INPR A1 - Lasaponara, Rosa A1 - Murgante, Beniamino A1 - Masini, Nicola A1 - Ge, Yong A1 - Asche, Hartmut T1 - Advance in geocomputation T2 - International journal of applied earth observation and geoinformation Y1 - 2014 U6 - https://doi.org/10.1016/j.jag.2013.10.004 SN - 0303-2434 VL - 26 SP - 429 EP - 431 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Reiterer, Susanne Maria A1 - Festman, Julia T1 - Special Issue: multilingual brains: individual differences in bi-and multilinguals T2 - International journal of bilingualism : cross-disciplinary, cross-linguistic studies of language behavior Y1 - 2014 U6 - https://doi.org/10.1177/1367006912456624 SN - 1367-0069 SN - 1756-6878 VL - 18 IS - 1 SP - 3 EP - 4 PB - Sage Publ. CY - London ER - TY - INPR A1 - Mischke, Steffen A1 - Chen, Fahu T1 - Introduction to "Late Pleistocene and Holocene climate change in continental Asia" T2 - Journal of paleolimnolog Y1 - 2014 U6 - https://doi.org/10.1007/s10933-013-9750-6 SN - 0921-2728 SN - 1573-0417 VL - 51 IS - 2 SP - 157 EP - 159 PB - Springer CY - Dordrecht ER - TY - INPR A1 - Eymann, Torsten A1 - Kundisch, Dennis A1 - Recker, Jan A1 - Bernstein, Abraham A1 - Gebauer, Judith A1 - Guenther, Oliver A1 - Ketter, Wolfgang A1 - zur Muehlen, Michael A1 - Riemer, Kai T1 - Should I stay or should I go - The challenges and opportunities of moving between University systems T2 - Business & information systems engineering : the international journal of Wirtschaftsinformatik Y1 - 2014 U6 - https://doi.org/10.1007/s12599-014-0319-3 SN - 1867-0202 VL - 6 IS - 2 SP - 115 EP - 126 PB - Springer CY - Heidelberg ER - TY - INPR A1 - Scheffler, Franziska A1 - Oberhänsli, Roland A1 - Pourteau, Amaury A1 - Candan, Osman A1 - Di Lucia, Matteo T1 - The rosetta marbles from feslegen, A-ren unit, SW Anatolia T2 - International journal of earth sciences Y1 - 2014 U6 - https://doi.org/10.1007/s00531-013-0936-y SN - 1437-3254 SN - 1437-3262 VL - 103 IS - 2 SP - 485 EP - 486 PB - Springer CY - New York ER - TY - INPR A1 - Föhlisch, Alexander A1 - de Groot, F. M. F. A1 - Odelius, Michael A1 - Techert, Simone A1 - Wernet, P. T1 - Comment on "state-dependent electron delocalization dynamics at the solute-solvent interface: soft-x-ray absorption spectroscopy and lambda b initio calculations" T2 - Physical review letters Y1 - 2014 U6 - https://doi.org/10.1103/PhysRevLett.112.129302 SN - 0031-9007 SN - 1079-7114 VL - 112 IS - 12 PB - American Physical Society CY - College Park ER - TY - INPR A1 - Hartmann, Matthias A1 - Fischer, Martin H. T1 - Pupillometry: The eyes shed fresh light on the mind T2 - Current biology Y1 - 2014 U6 - https://doi.org/10.1016/j.cub.2014.02.028 SN - 0960-9822 SN - 1879-0445 VL - 24 IS - 7 SP - R281 EP - R282 PB - Cell Press CY - Cambridge ER - TY - INPR A1 - Riemer, Martin T1 - Allyl alkyl carbonates T2 - Synlett : accounts and rapid communications in synthetic organic chemistry Y1 - 2014 U6 - https://doi.org/10.1055/s-0033-1340862 SN - 0936-5214 SN - 1437-2096 VL - 25 IS - 7 SP - 1041 EP - 1042 PB - Thieme CY - Stuttgart ER - TY - INPR A1 - Balazadeh, Salma T1 - Stay-green not always stays green T2 - Molecular plant Y1 - 2014 U6 - https://doi.org/10.1093/mp/ssu076 SN - 1674-2052 SN - 1752-9867 VL - 7 IS - 8 SP - 1264 EP - 1266 PB - Cell Press CY - Cambridge ER - TY - INPR A1 - Grimm, Volker A1 - Thorbek, Pernille T1 - Population models for ecological risk assessment of chemicals: Short introduction and summary of a special issue T2 - Ecological modelling : international journal on ecological modelling and engineering and systems ecolog Y1 - 2014 U6 - https://doi.org/10.1016/j.ecolmodel.2014.01.017 SN - 0304-3800 SN - 1872-7026 VL - 280 SP - 1 EP - 4 PB - Elsevier CY - Amsterdam ER - TY - INPR A1 - Lendlein, Andreas A1 - Neffe, Axel T. A1 - Jerome, Christine T1 - Advanced functional polymers for medicine T2 - Advanced healthcare materials Y1 - 2014 U6 - https://doi.org/10.1002/adhm.201400718 SN - 2192-2640 SN - 2192-2659 VL - 3 IS - 12 SP - 1939 EP - 1940 PB - Wiley-Blackwell CY - Hoboken ER - TY - INPR A1 - Dereudre, David A1 - Roelly, Sylvie T1 - Path-dependent infinite-dimensional SDE with non-regular drift : an existence result N2 - We establish in this paper the existence of weak solutions of infinite-dimensional shift invariant stochastic differential equations driven by a Brownian term. The drift function is very general, in the sense that it is supposed to be neither small or continuous, nor Markov. On the initial law we only assume that it admits a finite specific entropy. Our result strongly improves the previous ones obtained for free dynamics with a small perturbative drift. The originality of our method leads in the use of the specific entropy as a tightness tool and on a description of such stochastic differential equation as solution of a variational problem on the path space. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3(2014)11 KW - Infinite-dimensional SDE KW - non-Markov drift KW - non-regular drift KW - variational principle KW - specific entropy Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-72084 SN - 2193-6943 VL - 3 IS - 11 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Vioux, Andre A1 - Taubert, Andreas T1 - Ionic liquids 2014 and selected papers from ILMAT 2013: highlighting the ever-growing potential of ionic liquids T2 - International journal of molecular sciences Y1 - 2014 U6 - https://doi.org/10.3390/ijms151222815 SN - 1422-0067 VL - 15 IS - 12 SP - 22815 EP - 22818 PB - Molecular Diversity Preservation International CY - Basel ER - TY - INPR A1 - Kreibich, Heidi A1 - van den Bergh, Jeroen C. J. M. A1 - Bouwer, Laurens M. A1 - Bubeck, Philip A1 - Ciavola, Paolo A1 - Green, Colin A1 - Hallegatte, Stephane A1 - Logar, Ivana A1 - Meyer, Volker A1 - Schwarze, Reimund A1 - Thieken, Annegret T1 - Costing natural hazards T2 - Nature climate change Y1 - 2014 SN - 1758-678X SN - 1758-6798 VL - 4 IS - 5 SP - 303 EP - 306 PB - Nature Publ. Group CY - London ER - TY - INPR A1 - Thieken, Annegret A1 - Mariani, S. A1 - Longfield, S. A1 - Vanneuville, W. T1 - Preface: Flood resilient communities - managing the consequences of flooding T2 - Natural hazards and earth system sciences Y1 - 2014 U6 - https://doi.org/10.5194/nhess-14-33-2014 SN - 1561-8633 VL - 14 IS - 1 SP - 33 EP - 39 PB - Copernicus CY - Göttingen ER - TY - INPR A1 - Krahé, Barbara T1 - Restoring the spirit of fair play in the debate about violent video games a comment on Elson and Ferguson (2013) T2 - EUROPEAN PSYCHOLOGIST N2 - This commentary argues that, rather than providing an "exhaustive review," Elson and Ferguson (2013) discuss a selective sample of empirical studies on violent video game use which corroborate their claim that there is no systematic evidence for a link between violent video game play and aggression. In evaluating the evidence, the authors portray a biased picture of the current state of knowledge about media violence effects. They fail to distinguish between aggression and violence and between everyday and clinical forms of aggression. Furthermore, they misrepresent key constructs, such as mediation, moderation, and external validity, to discredit methodologies used to assess aggression and media violence use. The paper moves the debate backward rather than forward, falling behind existing meta-analytic studies that consider a much wider and more balanced range of studies. KW - media violence KW - aggression KW - mediation KW - socialization effects Y1 - 2014 U6 - https://doi.org/10.1027/1016-9040/a000165 SN - 1016-9040 SN - 1878-531X VL - 19 IS - 1 SP - 56 EP - 59 PB - Hogrefe CY - Kirkland ER - TY - INPR A1 - Hilczer, Börn A1 - Gerhard, Reimund A1 - Scott, James F. T1 - Special Issue of Ferroelectrics in Honor of S. B. Lang T2 - Ferroelectrics Y1 - 2014 U6 - https://doi.org/10.1080/00150193.2014.964099 SN - 0015-0193 SN - 1563-5112 VL - 472 IS - 1 SP - VII EP - VIII PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - INPR A1 - Gerhard, Reimund T1 - Sidney Lang - his collaboration with the University of Potsdam T2 - Ferroelectrics Y1 - 2014 U6 - https://doi.org/10.1080/00150193.2014.967090 SN - 0015-0193 SN - 1563-5112 VL - 472 IS - 1 SP - 5 EP - 5 PB - Routledge, Taylor & Francis Group CY - Abingdon ER - TY - INPR A1 - Makhmudov, Olimdjan A1 - Tarkhanov, Nikolai Nikolaevich T1 - The first mixed problem for the nonstationary Lamé system N2 - We find an adequate interpretation of the Lamé operator within the framework of elliptic complexes and study the first mixed problem for the nonstationary Lamé system. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3(2014)10 KW - Lamé system KW - evolution equation KW - first boundary value problem Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-71923 SN - 2193-6943 VL - 3 IS - 10 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Gairing, Jan A1 - Högele, Michael A1 - Kosenkova, Tetiana A1 - Kulik, Alexei Michajlovič T1 - On the calibration of Lévy driven time series with coupling distances : an application in paleoclimate N2 - This article aims at the statistical assessment of time series with large fluctuations in short time, which are assumed to stem from a continuous process perturbed by a Lévy process exhibiting a heavy tail behavior. We propose an easily implementable procedure to estimate efficiently the statistical difference between the noisy behavior of the data and a given reference jump measure in terms of so-called coupling distances. After a short introduction to Lévy processes and coupling distances we recall basic statistical approximation results and derive rates of convergence. In the sequel the procedure is elaborated in detail in an abstract setting and eventually applied in a case study to simulated and paleoclimate data. It indicates the dominant presence of a non-stable heavy-tailed jump Lévy component for some tail index greater than 2. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 2 KW - time series with heavy tails KW - index of stability KW - goodness-of-fit KW - empirical Wasserstein distance Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-69781 SN - 2193-6943 VL - 3 IS - 2 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Aizenberg, Lev A. A1 - Tarkhanov, Nikolai Nikolaevich T1 - An integral formula for the number of lattice points in a domain N2 - Using the multidimensional logarithmic residue we show a simple formula for the difference between the number of integer points in a bounded domain of R^n and the volume of this domain. The difference proves to be the integral of an explicit differential form over the boundary of the domain. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 3 KW - logarithmic residue KW - lattice point Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-70453 SN - 2193-6943 VL - 3 IS - 3 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Högele, Michael A1 - Pavlyukevich, Ilya T1 - Metastability of Morse-Smale dynamical systems perturbed by heavy-tailed Lévy type noise N2 - We consider a general class of finite dimensional deterministic dynamical systems with finitely many local attractors each of which supports a unique ergodic probability measure, which includes in particular the class of Morse–Smale systems in any finite dimension. The dynamical system is perturbed by a multiplicative non-Gaussian heavytailed Lévy type noise of small intensity ε > 0. Specifically we consider perturbations leading to a Itô, Stratonovich and canonical (Marcus) stochastic differential equation. The respective asymptotic first exit time and location problem from each of the domains of attractions in case of inward pointing vector fields in the limit of ε-> 0 has been investigated by the authors. We extend these results to domains with characteristic boundaries and show that the perturbed system exhibits a metastable behavior in the sense that there exits a unique ε-dependent time scale on which the random system converges to a continuous time Markov chain switching between the invariant measures. As examples we consider α-stable perturbations of the Duffing equation and a chemical system exhibiting a birhythmic behavior. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 5 KW - hyperbolic dynamical system KW - Morse-Smale property KW - stable limit cycle KW - small noise asymptotic KW - multiplicative noise Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-70639 SN - 2193-6943 VL - 3 IS - 5 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Conforti, Giovanni A1 - Dai Pra, Paolo A1 - Roelly, Sylvie T1 - Reciprocal class of jump processes N2 - Processes having the same bridges as a given reference Markov process constitute its reciprocal class. In this paper we study the reciprocal class of compound Poisson processes whose jumps belong to a finite set A in R^d. We propose a characterization of the reciprocal class as the unique set of probability measures on which a family of time and space transformations induces the same density, expressed in terms of the reciprocal invariants. The geometry of A plays a crucial role in the design of the transformations, and we use tools from discrete geometry to obtain an optimal characterization. We deduce explicit conditions for two Markov jump processes to belong to the same class. Finally, we provide a natural interpretation of the invariants as short-time asymptotics for the probability that the reference process makes a cycle around its current state. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 6 KW - reciprocal processes KW - stochastic bridges KW - jump processes KW - compound Poisson processes Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-70776 SN - 2193-6943 VL - 3 IS - 6 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Dyachenko, Evgueniya A1 - Tarkhanov, Nikolai Nikolaevich T1 - Singular perturbations of elliptic operators N2 - We develop a new approach to the analysis of pseudodifferential operators with small parameter 'epsilon' in (0,1] on a compact smooth manifold X. The standard approach assumes action of operators in Sobolev spaces whose norms depend on 'epsilon'. Instead we consider the cylinder [0,1] x X over X and study pseudodifferential operators on the cylinder which act, by the very nature, on functions depending on 'epsilon' as well. The action in 'epsilon' reduces to multiplication by functions of this variable and does not include any differentiation. As but one result we mention asymptotic of solutions to singular perturbation problems for small values of 'epsilon'. T3 - Preprints des Instituts für Mathematik der Universität Potsdam - 3 (2014) 1 KW - singular perturbation KW - pseudodifferential operator KW - ellipticity with parameter KW - regularization KW - asymptotics Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-69502 SN - 2193-6943 VL - 3 IS - 1 PB - Universitätsverlag Potsdam CY - Potsdam ER - TY - INPR A1 - Grapentin, Andreas A1 - Heidler, Kirstin A1 - Korsch, Dimitri A1 - Kumar Sah, Rakesh A1 - Kunzmann, Nicco A1 - Henning, Johannes A1 - Mattis, Toni A1 - Rein, Patrick A1 - Seckler, Eric A1 - Groneberg, Björn A1 - Zimmermann, Florian ED - Hentschel, Uwe ED - Richter, Daniel ED - Polze, Andreas T1 - Embedded operating system projects N2 - In today’s life, embedded systems are ubiquitous. But they differ from traditional desktop systems in many aspects – these include predictable timing behavior (real-time), the management of scarce resources (memory, network), reliable communication protocols, energy management, special purpose user-interfaces (headless operation), system configuration, programming languages (to support software/hardware co-design), and modeling techniques. Within this technical report, authors present results from the lecture “Operating Systems for Embedded Computing” that has been offered by the “Operating Systems and Middleware” group at HPI in Winter term 2013/14. Focus of the lecture and accompanying projects was on principles of real-time computing. Students had the chance to gather practical experience with a number of different OSes and applications and present experiences with near-hardware programming. Projects address the entire spectrum, from bare-metal programming to harnessing a real-time OS to exercising the full software/hardware co-design cycle. Three outstanding projects are at the heart of this technical report. Project 1 focuses on the development of a bare-metal operating system for LEGO Mindstorms EV3. While still a toy, it comes with a powerful ARM processor, 64 MB of main memory, standard interfaces, such as Bluetooth and network protocol stacks. EV3 runs a version of 1 1 Introduction Linux. Sources are available from Lego’s web site. However, many devices and their driver software are proprietary and not well documented. Developing a new, bare-metal OS for the EV3 requires an understanding of the EV3 boot process. Since no standard input/output devices are available, initial debugging steps are tedious. After managing these initial steps, the project was able to adapt device drivers for a few Lego devices to an extent that a demonstrator (the Segway application) could be successfully run on the new OS. Project 2 looks at the EV3 from a different angle. The EV3 is running a pretty decent version of Linux- in principle, the RT_PREEMPT patch can turn any Linux system into a real-time OS by modifying the behavior of a number of synchronization constructs at the heart of the OS. Priority inversion is a problem that is solved by protocols such as priority inheritance or priority ceiling. Real-time OSes implement at least one of the protocols. The central idea of the project was the comparison of non-real-time and real-time variants of Linux on the EV3 hardware. A task set that showed effects of priority inversion on standard EV3 Linux would operate flawlessly on the Linux version with the RT_PREEMPT-patch applied. If only patching Lego’s version of Linux was that easy... Project 3 takes the notion of real-time computing more seriously. The application scenario was centered around our Carrera Digital 132 racetrack. Obtaining position information from the track, controlling individual cars, detecting and modifying the Carrera Digital protocol required design and implementation of custom controller hardware. What to implement in hardware, firmware, and what to implement in application software – this was the central question addressed by the project. N2 - Heutzutage sind eingebettete Systeme allgegenwärtig. Allerdings unterscheiden sie sich in vielen Aspekten von traditionellen Desktop-System – dazu gehören vorhersagbares Zeitverhalten („Echtzeit“), die Verwaltung von knappen Ressourcen (Speicher, Netzwerk), zuverlässige Kommunikationsprotokolle, Energiemanagement, spezialisierte Benutzungsschnittstellen („headless“), Systemkonfiguration, Programmiersprachen (zur Unterstützung von Software-Hardware-Co-Design) und Modellierungstechniken. In diesem technischen Bericht präsentieren die Autoren Ergebnisse aus der Vorlesung „Betriebssysteme für Embedded Computing“, die von der Fachgruppe „Betriebssysteme und Middleware“ am HPI in Wintersemester 2013/14 angeboten wurde. Schwerpunkte der Vorlesung und der begleitenden Projekte waren Prinzipien von Echtzeit-Computing. Die Studenten hatten die Möglichkeit, praktische Erfahrungen mit einer Reihe von verschiedenen Betriebssystemen und Anwendungen zu sammeln und präsentieren ihre Erfahrungen mit hardwarenaher Programmierung. Die Projekte adressieren das gesamte Spektrum von der Bare-Metal-Programmierung über die Nutzung eines Echtzeitbetriebssystem bis zur Anwendung des vollen Software-Hardware-Co-Design-Zyklus‘. Drei herausragende Projekte sind das Herzstück dieses technischen Berichts. Projekt 1 konzentriert sich auf die Entwicklung eines Bare-Metal-Betriebssystems für LEGO Mindstorms EV3. Obwohl es ein Spielzeug ist, kommt es mit einem leistungsstarken ARM-Prozessor, 64 MB Hauptspeicher und Standardschnittstellen wie Bluetooth und einem Netzwerkprotokollstapel. Auf dem EV3 läuft spezielle Linux-Version – die Quellen sind auf der Lego-Website verfügbar. Allerdings sind viele Geräte und deren Treiber-Software urheberrechtlich geschützt und nicht gut dokumentiert. Die Entwicklung eines neuen Bare-Metal-Betriebssystem für den EV3 erfordert ein Verständnis des EV3-Bootvorgangs. Da keine Standard-Ein-/Ausgabegeräte zur Verfügung stehen, sind anfängliche Debug-Schritte mühsam. Nach dem Absolvieren dieser ersten Schritte war das Projekt in der Lage, Gerätetreiber für einige Lego-Geräte anzupassen um einen Demonstrator (die Segway-Anwendung) erfolgreich auf dem neuen Betriebssystem laufen zu lassen. Projekt 2 befasst sich mit dem EV3 aus einer anderen Perspektive. Der EV3 wird mit einer üblichen EV3 Linux-Version betrieben – im Prinzip kann der RT_PREEMPT-Patch jedes Linux-System in ein Echtzeitbetriebssystem verwandeln, indem er das Verhalten einer Anzahl von Synchronisationskonstrukten im Herzen des Betriebssystems anpasst. Priority Inversion ist ein Problem, das durch Protokolle wie Prioritätsvererbung oder Priority Ceiling gelöst wird. Heutige Echtzeit-Betriebssysteme implementieren mindestens eines dieser Protokolle. Die zentrale Idee des Projekts war der Vergleich der Nicht-Echtzeit und Echtzeit-Varianten von Linux auf der EV3-Hardware. Ein Task-Set, das die Auswirkungen der Prioritätsumkehr auf Standard-EV3 Linux zeigt, würde ohne Probleme auf der Linux-Version mit dem RT_PREEMPT-Patch betrieben werden können. Wenn nur das Patchen Lego-Version von Linux war so einfach wäre... Projekt 3 nimmt den Begriff des Echtzeit-Computing ernst. Das Anwendungsszenario wurde um unsere Carrera Digital 132 Bahn angeordnet. Das Sammeln von Positionsinformationen, die Steuerung einzelner Fahrzeuge, die Erfassung und Änderung des Carrera Digital-Protokolls erfordert die Konzeption und Umsetzung von spezialisierter Controller-Hardware. Die zentrale Fragestellung dieses Projekts war, was in Hardware, in Firmware oder in der Anwendungssoftware zu implementieren ist. T3 - Technische Berichte des Hasso-Plattner-Instituts für Digital Engineering an der Universität Potsdam - 90 KW - Echtzeit KW - eingebettete Systeme KW - Betriebssysteme KW - Erfahrungsbericht KW - LEGO Mindstorms EV3 KW - RT_PREEMT-Patch KW - Carrera Digital D132 KW - real-time KW - embedded systems KW - operating systems KW - experience report KW - LEGO Mindstorms EV3 KW - RT_PREEMT patch KW - Carrera Digital D132 Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-69154 SN - 978-3-86956-296-4 SN - 1613-5652 SN - 2191-1665 IS - 90 PB - Universitätsverlag Potsdam CY - Potsdam ER -