TY - CONF
AB - Juni 2010
AU - Büker, Petra
ID - 19917
TI - Hilf mir, es selbst zu tun! Rede anlässlich der Gründungsveranstaltung der Montessori-Schule Salzkotten
ER -
TY - CONF
AU - Arens, Stephan
AU - Domik, Gitta
ED - Westermann, Ruediger
ED - Kindlmann, Gordon
ID - 21772
SN - 1727-8376
T2 - IEEE/ EG Symposium on Volume Graphics
TI - A Survey of Transfer Functions Suitable for Volume Rendering
ER -
TY - THES
AU - Möller, Jens
ID - 22357
SN - 978-3- 89959-966-4
TI - Rechnerische und experimentelle Bestimmung der Lagerkräfte eines stufenlosen Umschlingungsgetriebes
ER -
TY - CONF
AU - Wette, Philip
AU - Arens, Stephan
AU - Elsner, Andreas
AU - Domik, Gitta
ID - 15035
T2 - Computer Graphics and Imaging
TI - Extending the corkscrew algorithm to find bifurcations of vessels
VL - 679
ER -
TY - CONF
AU - Becker, Jörg
AU - Beverungen, Daniel
AU - Matzner, Martin
AU - Müller, Oliver
ED - Kommers, Piet
ED - Isaías, Pedro
ID - 3467
SN - 978-972-8939-07-6
T2 - Proceedings of the IADIS Internatioal Conference e-Society 2010
TI - Total Cost of Service Life --- Decision Support for Selecting and Orchestrating Services
ER -
TY - JOUR
AB - We present an implementation of the GW approximation for the electronic self-energy within the full-potential linearized augmented-plane-wave (FLAPW) method. The algorithm uses an all-electron mixed product basis for the representation of response matrices and related quantities. This basis is derived from the FLAPW basis and is exact for wave-function products. The correlation part of the self-energy is calculated on the imaginary-frequency axis with a subsequent analytic continuation to the real axis. As an alternative we can perform the frequency convolution of the Green function G and the dynamically screened Coulomb interaction W explicitly by a contour integration. The singularity of the bare and screened interaction potentials gives rise to a numerically important self-energy contribution, which we treat analytically to achieve good convergence with respect to the k-point sampling. As numerical realizations of the GW approximation typically suffer from the high computational expense required for the evaluation of the nonlocal and frequency-dependent self-energy, we demonstrate how the algorithm can be made very efficient by exploiting spatial and time-reversal symmetry as well as by applying an optimization of the mixed product basis that retains only the numerically important contributions of the electron-electron interaction. This optimization step reduces the basis size without compromising the accuracy and accelerates the code considerably. Furthermore, we demonstrate that one can employ an extrapolar approximation for high-lying states to reduce the number of empty states that must be taken into account explicitly in the construction of the polarization function and the self-energy. We show convergence tests, CPU timings, and results for prototype semiconductors and insulators as well as ferromagnetic nickel.
AU - Friedrich, Christoph
AU - Blügel, Stefan
AU - Schindlmayr, Arno
ID - 18558
IS - 12
JF - Physical Review B
SN - 1098-0121
TI - Efficient implementation of the GW approximation within the all-electron FLAPW method
VL - 81
ER -
TY - GEN
AB - An $r$-graph is an $r$-regular graph where every odd set of vertices is
connected by at least $r$ edges to the rest of the graph. Seymour conjectured
that any $r$-graph is $r+1$-edge-colorable, and also that any $r$-graph
contains $2r$ perfect matchings such that each edge belongs to two of them. We
show that the minimum counter-example to either of these conjectures is a
brick. Furthermore we disprove a variant of a conjecture of Fan, Raspaud.
AU - Mkrtchyan, Vahan
AU - Steffen, Eckhard
ID - 10202
T2 - arXiv:1003.5782
TI - Bricks and conjectures of Berge, Fulkerson and Seymour
ER -
TY - CONF
AU - Khatir, Mehrdad
AU - Ghasemzadeh Mohammadi, Hassan
AU - Ejlali, Alireza
ID - 10776
T2 - Computer Design (ICCD), 2010 IEEE International Conference on
TI - Sub-threshold charge recovery circuits
ER -
TY - GEN
AU - Dridger, Denis
ID - 10649
TI - Soft Microprocessors with tightly coupled Application-Specific Coprocessors
ER -
TY - GEN
AU - Fröse, Viktor
AU - Ibers, Rüdiger
AU - Hellebrand, Sybille
ID - 10670
KW - WORKSHOP
TI - Testdatenkompression mit Hilfe der Netzwerkinfrastruktur
ER -