3,339 research outputs found
Glimm, J. The Legacy of John von Neumann
No full textJames Glimm, John Impagliazzo, and I. M Singer/ editors. The Legacy of John von Neumann
Series: Proceedings of symposia in pure mathematics; v. 50. John von Neumann : a personal view / Marina v.N. Whitman -- Remembering John von Neumann / Peter D. Lax -- Nonmathematical reminiscences about Johnny von Neumann / Françoise Ulam -- The extraordinary inspiration of John von Neumann / Israel Halperin -- The philosophical legacy of John von Neumann, in light of its inception and evolution in his formative years / Nicholas Vonneuman -- Von Neumann and the early days of ergodic theory / George W. Mackey -- Von Neumann and ergodic theory / Donald S. Ornstein -- Nonconventional ergodic averages / Hillel Furstenberg -- The rings of operators papers / F.J. Murray -- Operator algebras-- an overview / Richard V. Kadison -- Introduction à la géométrie non-commutative / Alain Connes -- Some of the legacy of John von Neumann in physics : theory of measurement, quantum logic, and von Neumann algebras in physics / Huzihiro Araki -- Mathematics motivated by physics / Arthur Jaffe. (cont.) The mathematical implications of fundamental physical principles / I.E. Segal -- On the principles of large scale computing machines / Herman H. Goldstine and John von Neumann -- Scientific computing : Von Neumann\u27s vision, today\u27s realities, and the promise of the future /James Glimm-- Intermittency of turbulence / Zhen-Su She, Eric Jackson, and Steven A. Orszag -- Supercomputer simulations of the interaction of biomolecules in solution / Enrico Clementi ... [et al.] -- Von Neumann and neural networks / Jack D. Cowan -- Two-person, perfect-information GAMES / Elwyn Berlekamp -- The origins of John von Neumann\u27s theory of automata / William Aspray -- Developments in The synthesis of reliable organisms from unreliable components / Nicholas Pippenger.https://digitalcommons.rockefeller.edu/ru-authors/1074/thumbnail.jp
白金微粒/Ru錯合物/高分子薄磨修飾電極之製備及其電催化應用
No full text[[abstract]]Membrane-metal modified cells are usually applied to the field of membrane cells, such as fuel cells, light cells… etc. Some hydrogen evolution catalysts, for example Pt metal, are used as the cathodes in these cells. Therefore, in this research, we try to dose a series of Ru complexes into the intervals between the cathode and the thin film electrode to improve the hydrogen evolution efficiency of the membrane-metal modified cells.
Ru complex (chosen from Ru(bpy)2phenNH2, Ru(dmb)2 phenNH2, Ru(tmb)2phenNH2, Ru(bpy)2Cl2, Ru(dmb)2Cl2, Ru(tmb)2Cl2) doped Nafion solution was drop-coated onto glassy carbon (GC) electrode and formed a thin film after drying. Then, the GC electrode was immersed into H2PtCl6 solution, and the Pt/Ru complex/polymer modified electrode was obtained by reducing Pt with a DPTB method. Different amount of Pt was electroplated on the GC electrode even at the same conditions (the same potential, the same time interval) when different consistency or kinds of Ru complexes were used, suggesting the influence of the ligands on the red-ox property of Ru complexes. The effective surface area (estimated by CV method) of Pt in the modified electrode is also varied with different species of Ru complexes, which in turn affect on the efficiency of hydrogen evolution.
Furthermore, from the information obtained by SEM and EDS, the alignment and the density of Pt particles growing on the GC electrode are figured out. From the fluorescence lifetime and luminescence spectra, a good electron-transfer is considered to have occurred between D series Ru complexes and Pt modified electrode that explained why a high hydrogen evolution efficiency has been obtained. The modified electrodes are still stable one month after fabricated and their hydrogen evolution efficiency was as good as a newly prepared one.
"Sprachliche Bildung" im Kindergarten ethnographisch erforscht? Reflexionen über methodologische Herausforderungen
No full textDiehm I, Magyar-Haas V. "Sprachliche Bildung" im Kindergarten ethnographisch erforscht? Reflexionen über methodologische Herausforderungen. In: Honig M-S, Neumann S, eds. (Doing) Ethnography im Early Childhood. Education and Care. Proceedings of an International Colloquium at the University of Luxembourg. Luxembourg: Universität of Luxembourg, RU INSIDE; 2012: 33-52
Approximate equivalence invon Neumann algebras
No full textIn this paper we investigate approximate equivalence in von Neumann algebras. We find a necessary and sufficient condition for two normal operators to be approximately equivalent in any von Neumann algebra acting on a separable Hilbert space H with unitaries in For the approximate equivalence of two unital representations from a given C\*-algebra to any von Neumann algebra acting on a separable Hilbert space, we find the necessary condition for the general case. Finally we investigate an interesting class of C\*-algebras, closed under direct sum, direct limit and quotient map, which contains C(X) and M\sb{n}(A), where A is in Q
JOSHUA LEDERBERG - JOHN VON NEUMANN SYMPOSIUM
No full textThe Joshua Lederberg-John von Neumann Symposium: Toward Quantitative Biologyhttps://digitalcommons.rockefeller.edu/posters/1186/thumbnail.jp
JOSHUA LEDERBERG - JOHN VON NEUMANN SYMPOSIUM
No full textThe Joshua Lederberg-John von Neumann Symposium: Toward Quantitative Biologyhttps://digitalcommons.rockefeller.edu/posters/1148/thumbnail.jp
Synthesis ans Structure of η1:η2-Metallophosphaalkene Complexes (η5-C5H5)2(CO)2Fe2[η5-C5Me4R)(CO)LM-P=CHSMe] (M = Fe, Ru, Mn; L = CO, NO; R = Me, Et)
No full textWeber L, Schumann I, Stammler H-G, Neumann B. Synthesis ans Structure of η1:η2-Metallophosphaalkene Complexes (η5-C5H5)2(CO)2Fe2[η5-C5Me4R)(CO)LM-P=CHSMe] (M = Fe, Ru, Mn; L = CO, NO; R = Me, Et). Organometallics. 1995;14(4):1626-1631
Photophysical Characterization of Ru Nanoclusters on Nanostructured TiO<sub>2</sub> by Time-Resolved Photoluminescence Spectroscopy
No full textDespite the promising performance of Ru nanoparticles or nanoclusters on nanostructured TiO2 in photocatalytic and photothermal reactions, a mechanistic understanding of the photophysics is limited. The aim of this study is to uncover the nature of light-induced processes in Ru/TiO2 and the role of UV versus visible excitation by time-resolved photoluminescence (PL) spectroscopy. The PL at a 267 nm excitation is predominantly due to TiO2, with a minor contribution of the Ru nanoclusters. Relative to TiO2, the PL of Ru/TiO2 following a 267 nm excitation is significantly blue-shifted, and the bathochromic shift with time is smaller. We show by global analysis of the spectrotemporal PL behavior that for both TiO2 and Ru/TiO2 the bathochromic shift with time is likely caused by the diffusion of electrons from the TiO2 bulk toward the surface. During this directional motion, electrons may recombine (non)radiatively with relatively immobile hole polarons, causing the PL spectrum to red-shift with time following excitation. The blue-shifted PL spectra and smaller bathochromic shift with time for Ru/TiO2 relative to TiO2 indicate surface PL quenching, likely due to charge transfer from the TiO2 surface into the Ru nanoclusters. When deposited on SiO2 and excited at 532 nm, Ru shows a strong emission. The PL of Ru when deposited on TiO2 is completely quenched, demonstrating interfacial charge separation following photoexcitation of the Ru nanoclusters with a close to unity quantum yield. The nature of the charge-transfer phenomena is discussed, and the obtained insights indicate that Ru nanoclusters should be deposited on semiconducting supports to enable highly effective photo(thermal)catalysis.QN/Afdelingsburea
Quantitative analysis of chloroplast protein targeting
No full textThis thesis presents the first use of the Partition of Unity Method in quantifying
the spatio-temporal dynamics of a fluorescent protein targeted to
the chloroplast twin-arginine translocation pathway.
The fluorescence loss in photobleaching technique is applied in a modified
fashion to the measurement of substrate mobilities in the chloroplast
stroma. Our in vivo results address the two suggested protein targeting
mechanisms of membrane-binding before lateral movement to the translocon
and direct binding to the translocon.
A high performance computing C/C++ implementation of the Partition
of Unity Method is used to perform simulations of fluoresence loss
in photobleaching and allow a compelling comparison to photobleaching
data series. The implementation is both mesh-free and particle-less
Novel rhodium and ruthenium carbonyl cluster complexes with face- and edge-bridging GaCp* ligands. Synthesis and structural characterization of the Rh-6(CO)(12)(mu(3)-GaCp*)(4) and Ru-6(eta(6)-C)(mu(2)-CO)(CO) (13)(mu(3)-GaCp*)(2)(mu(2)-GaCp*) clusters
No full textGrachova EV, Jutzi P, Neumann B, Stammler H-G. Novel rhodium and ruthenium carbonyl cluster complexes with face- and edge-bridging GaCp* ligands. Synthesis and structural characterization of the Rh-6(CO)(12)(mu(3)-GaCp*)(4) and Ru-6(eta(6)-C)(mu(2)-CO)(CO) (13)(mu(3)-GaCp*)(2)(mu(2)-GaCp*) clusters. DALTON TRANSACTIONS. 2005;(22):3614-3616.Reactions of hexanuclear carbonyl clusters of rhodiumRh(6)-(CO)(16) and ruthenium Ru-6(eta(6)-C)(mu(2)-CO)(CO)(16) with GaCp* (Cp* = C5Me5) in the mild conditions result in substitution of CO ligands and formation of the Rh-6(CO)(12)(mu(3)-GaCp*)(4) and the Ru-6(eta(6)-C)(mu(2)-CO)(CO)(13)(mu(3)-GaCp*)(2)(mu(2)-GaCp*) cluster derivatives
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