2,454 research outputs found
Robert Neumann: Mit eigener Feder
No full textRobert Neumann (1897–1957, Austrian exiled author and Vicepresidet of the PEN International, was even a disputatious antifascist political writer. His essays, his letters and biograpical documents give a vivid portrait of the diversity of literary life in Germay and Austria (before 1933/after 1958) and of exile in England (1933–1958).Der österreichische Schriftsteller Robert Neumann (1897–1975), Exilant und Vizepräsident des PEN International, war auch ein streitbarer antifaschistischer Publizist. Seine politisch-literarischen Aufsätze, seine Briefe und biographischen Dokumente ergeben ein lebendiges und facettenreiches Bild des literarischen Lebens in Deutschland und Österreich (vor 1933/nach 1958) und des Exils in England (1933–1958)
Relative Haagerup property for arbitrary von Neumann algebras
No full textWe introduce the relative Haagerup approximation property for a unital, expected inclusion of arbitrary von Neumann algebras and show that if the smaller algebra is finite then the notion only depends on the inclusion itself, and not on the choice of the conditional expectation. Several variations of the definition are shown to be equivalent in this case, and in particular the approximating maps can be chosen to be unital and preserving the reference state. The concept is then applied to amalgamated free products of von Neumann algebras and used to deduce that the standard Haagerup property for a von Neumann algebra is stable under taking free products with amalgamation over finite-dimensional subalgebras. The general results are illustrated by examples coming from q-deformed Hecke-von Neumann algebras and von Neumann algebras of quantum orthogonal groups.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Analysi
A comparison of deflation and the balancing Neumann-Neumann preconditioner
No full textIn this paper we compare various preconditioners for the numerical solution of partial differential equations. We compare the well-known balancing Neumann Neumann preconditioner used in domain decomposition methods with a so-called deflation preconditioner. We prove that the effective condition number of the deflated preconditioned system is always, i.e. for all deflation vectors and all restrictions and prolongations, below the condition number of the system preconditioned by the balancing Neumann-Neumann preconditioner. Even more, we establish that both preconditioners lead to almost the same spectra. The zero eigenvalues of the deflation preconditioned system are replaced by eigenvalues which are one if the balancing Neumann-Neumann preconditioner is used. Moreover, we proved that the A-norm of the errors of the iterates build by the deflation preconditioner is always below the A-norm of the errors of the iterates build by the balancing Neumann-Neumann preconditioner. Additionally, the amount of work of one iteration of the de ation preconditioned system is less than the amount of work of one iteration of the balancing Neumann-Neumann preconditioned system. Finally, we establish that the deflation preconditioner and the balancing Neumann-Neumann preconditioner produces the same iterates if one uses certain starting vectors. Numerical results for porous media flows emphasize the theoretical results.Electrical Engineering, Mathematics and Computer Scienc
Merging Tribenzotriquinacene and Triptycene
No full textLucchesini F, Grasse M, Neumann B, Stammler H-G, Tellenbroeker J, Kuck D. Merging Tribenzotriquinacene and Triptycene. EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. 2016;2016(16):2828-2841.The geometric and chemically related structural motifs of tribenzotriquinacene (TBTQ, 1) and triptycene (2) have been merged for the first time on the level of the parent hydrocarbons. A classical cyclodehydration strategy was used to synthesize 1,4-dimethoxytribenzotriquinacene 13 and convert it into the corresponding TBTQ-based para-benzoquinone 4. The Diels-Alder reaction of 4 with anthracene afforded anti-and syn-cycloadducts 22 and 23, respectively, in the ratio of 1: 3, which were transformed into dibenzo(triptyceno) triquinacene 5, a new parent polycyclic aromatic hydrocarbon, and derivatives 25-28. The structure of TBTQ-quinone 4 was also extended to give related 1,4-anthraquinone 32. The intriguing geometrical and structural aspects of the merged TBTQ-triptycene motif were examined by X-ray crystal analysis and molecular modeling with the aim to construct tris(triptyceno) triquinacenes, hypothetical analogues that are characterized by a deep molecular cavity
[Rezension zu:] Beate Burtscher-Bechter, Peter W. Haider, Birgit Mertz-Baumgartner u. Robert Rollinger (Hg.): Grenzen und Entgrenzungen
No full textRezension zu Beate Burtscher-Bechter, Peter W. Haider, Birgit Mertz-Baumgartner u. Robert Rollinger (Hg.): Grenzen und Entgrenzungen. Historische und kulturwissenschaftliche Überlegungen am Beispiel des Mittelmeerraumes. Würzburg (Königshausen & Neumann) 2006 (=Saarbrücker Beiträge zur vergleichenden Literatur- und Kulturwissenschaft, Bd. 36). 372 S
Effective Protein Interactions in a Coarse-Grained Model for Lipid Membranes
No full textWest B, Schmid F. Effective Protein Interactions in a Coarse-Grained Model for Lipid Membranes. In: Münster G, Wolf D, Kremer M, John-von-Neumann-Institut für Computing, eds. NIC Symposium 2008. NIC Series. Vol 39. Jülich: John von Neumann Institute for Computing; 2008: 271-278
Funeral of theatre director František Neumann in Brno
No full textThe segment captures the funeral of theatre director František Neumann held in Brno on 27 February 1929. The coffin is carried out of the building of the Mahen Theatre and loaded onto a horse-drawn hearse. The funeral procession moves along the streets of Brno towards the railway station, where the coffin is placed in a special funeral carriage. The train leaves for Prostějov, Neumann´s final resting place. The footage includes two versions of the film capturing the same event
Chairs on Chairs: Mark Pimlott
No full textInterview by Malgorzata Neumann with Mark Pimlott.OLD Interio
Solving integral equations with generalized Neumann kernel using global simpler GMRES for numerical conformal mapping
No full textWe study a numerical approach for solving integral equation with adjoint generalized Neumann kernel related to conformal mapping. Previously, computation of conformal mapping of M + 1 connected regions require solving at least M + 1 integral equations with adjoint generalized Neumann kernel separately. We apply global simpler GMRES which solve nonsymmetric system with multiple right-hand sides to solve M + 1 integral equations simultaneously. We also apply fast multipole method for several matrix vector products in every iteration of global simpler GMRES. Numerical example is given to illustrate the effectiveness of the proposed method
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