TY - JOUR A1 - Kossick, Regine A1 - Schulte (Fotos), Philip A1 - Kuiper (Fotos), Jens-Hendrik T1 - Die Bibliothek des Konrad-Zuse-Zentrums für Informationstechnik "Überall ist Mathematik drin" JF - One Person Libraries Berlin. 10 Jahre Arbeitskreis OPL Berlin/Brandenburg Y1 - 2010 SP - 18 EP - 23 ER - TY - GEN T1 - Annual Report 2013 T3 - Jahresbericht - 2013 KW - Jahresbericht Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-52848 SN - 0934-5892 VL - 2013 ER - TY - JOUR A1 - Zschiedrich, Lin A1 - Klose, Roland A1 - Schädle, Achim A1 - Schmidt, Frank T1 - A new finite element realization of the Perfectly Matched Layer Method for Helmholtz scattering problems on polygonal domains in 2D JF - J. Comput. Appl. Math. Y1 - 2006 U6 - https://doi.org/10.1016/j.cam.2005.03.047 VL - 188 SP - 12 EP - 32 ER - TY - GEN T1 - Jahresbericht 2012 T1 - Annual 2012 T3 - Jahresbericht - 2012 KW - Annual Report Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-18510 SN - 0934-5892 VL - 2012 ER - TY - GEN T1 - Jahresbericht 2011 T1 - Annual 2011 T3 - Jahresbericht - 2011 KW - Annual Report Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-15867 SN - 0934-5892 VL - 2011 ER - TY - GEN T1 - Jahresbericht 2010 T1 - Annual 2010 T3 - Jahresbericht - 2010 KW - Annual Report Y1 - 2011 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-13165 ER - TY - GEN T1 - Jahresbericht 2009 T1 - Annual 2009 T3 - Jahresbericht - 2009 KW - Annual Report Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-11814 SN - 0934-5892 ER - TY - GEN T1 - Jahresbericht 2008 T1 - Annual 2008 T3 - Jahresbericht - 2008 KW - Annual Report Y1 - 2009 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-11307 SN - 0934-5892 ER - TY - GEN A1 - Oevermann, Michael A1 - Scharfenberg, Carsten A1 - Klein, Rupert T1 - A sharp interface finite volume method for elliptic equations on Cartesian grids N2 - We present a second order sharp interface finite volume method for the solution of the three-dimensional poisson equation with variable coefficients on Cartesian grids. In particular, we focus on interface problems with discontinuities in the coefficient, the source term, the solution, and the fluxes across the interface. The method uses standard piecewiese trilinear finite elements for normal cells and a double piecewise trilinear ansatz for the solution on cells intersected by the interface resulting always in a compact 27-point stencil. Singularities associated with vanishing partial volumes of intersected grid cells are removed by a two-term asymptotic approach. In contrast to the 2D method presented by two of the authors in [M.~Oevermann, R.~Klein: A Cartesian grid finite volume method for elliptic equations with variable coefficients and embedded interfaces, J.~Comp.~Phys.~219 (2006)] we use a minimization technique to determine the unknown coefficients of the double trilinear ansatz. This simplifies the treatment of the different cut-cell types and avoids additional special operations for degenerated interface topologies. The resulting set of linear equations has been solved with a BiCGSTAB solver preconditioned with an algebraic multigrid. In various testcases -- including large coefficient ratios and non-smooth interfaces -- the method achieves second order of accuracy in the L_inf and L_2 norm. T3 - ZIB-Report - 08-38 KW - elliptische Gleichungen KW - Finite Volumen KW - eingebettete Ränder KW - variable und diskontinuierliche Koeffizienten KW - diskontinuierliche Lösung KW - Elliptic equations KW - finite volume methods KW - embedded interface KW - variable and discontinuous coefficients KW - discontinuous solution Y1 - 2008 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-10900 SN - 1438-0064 ER - TY - THES A1 - Böhner, Dörte T1 - Chancen und Risiken Digitaler Rechtebeschreibung für wissenschaftliche Bibliotheken in Deutschland - Möglichkeiten und Perspektiven von Digital Rights Management T1 - Chances and risks of Digital Rights Description for academic libraries in Germany - Possibilities and perspectives of Digital Rights Management N2 - Wissenschaftliche Bibliotheken sind Vermittler von digitalen Medieninhalten. Sie müssen ihren Nutzern einen Zugang zu ihnen ermöglichen. Digitales Rechte Management (DRM), eingesetzt von den Verlagen, soll Nutzung und Zugang kontrollieren. Bibliotheken stehen DRM daher misstrauisch gegenüber, da dieses als Gefahr für die Wissenschaft und ihre (digitalen) Bibliotheken gesehen wird. Nur eine effektive Auseinandersetzung der wissenschaftlichen Bibliotheken mit der jeweiligen Politik der Verlage und den Verfahrensweisen bei DRM ermöglicht es ihnen, ihre Rolle als Vermittler und 'Gedächtnis der Menschheit' auch weiterhin erfolgreich wahrnehmen zu können. Unbestritten ist, dass DRM in seiner restriktiven Form die tägliche Arbeit der Bibliotheken erschwert. Deshalb müssen sie sich aktiv an der Standardisierung, der Entwicklung von Nutzungskonzepten und der Gestaltung der Rahmenbedingungen beteiligen. N2 - Academic libraries are mediators of digital content. They have to ensure access for their patrons. Digital Rights Management (DRM), used by publishers, should control access and usage. Libraries mistrust DRM, because it is seen as a danger to scholarship, sciences and their (digital) libraries. Libraries only can persist as the 'archive of all human knowledge' if they start an effective controversy about the publishers' policies and if they know how DRM works. It is uncontentious that the restrictive form of DRM will complicate the everyday work of libraries. Therefore they have to engage in the prozess of standardization, in the development of concepts of usage and in the definition of general conditions of DRM. KW - Digital Rights Management KW - Urheberrecht KW - Lizenzvertrag KW - Rechtebeschreibung KW - Rechtebeschreibungssprache KW - Digital Rights Management KW - Licence Agreement KW - German Copyright Law KW - Rights Description KW - Rights Description Language Y1 - 2008 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0297-zib-9271 ER -