1,720,963 research outputs found
X(ALPHA) ELECTRON-STRUCTURE OF [VFE3S4(SH)6]4- AND POSSIBLE RELEVANCE TO THE NITROGENASE PROBLEM
No full textMüller A, WITTNEBEN V. X(ALPHA) ELECTRON-STRUCTURE OF [VFE3S4(SH)6]4- AND POSSIBLE RELEVANCE TO THE NITROGENASE PROBLEM. THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE. 1990;68(3-4):223-230
VANADIUM ACCUMULATION IN THE NITROGEN-FIXING HYDROGEN BACTERIUM XANTHOBACTER-AUTOTROPHICUS
No full textMüller A, Schneider K, Erfkamp J, Wittneben V, Diemann E, Eaton AN. VANADIUM ACCUMULATION IN THE NITROGEN-FIXING HYDROGEN BACTERIUM XANTHOBACTER-AUTOTROPHICUS. Naturwissenschaften. 1988;75(12):625-627
[H6AS10MO24O90]8-, A HETEROPOLYANION COMPRISING 2 LINKED SPHERICAL FRAGMENTS, AND REDUCED KEGGIN ANIONS AS ITS DEGRADATION PRODUCTS
No full textMüller A, Krickemeyer E, PENK M, WITTNEBEN V, DORING J. [H6AS10MO24O90]8-, A HETEROPOLYANION COMPRISING 2 LINKED SPHERICAL FRAGMENTS, AND REDUCED KEGGIN ANIONS AS ITS DEGRADATION PRODUCTS. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1990;29(1):88-90
SULFUR-EDGE X-RAY ABSORPTION NEAR EDGE SPECTRA (XANES) OF SOME THIOMETALLATES AND THIOMETALLATO COMPLEXES
No full textWittneben V, SPRAFKE A, Diemann E, et al. SULFUR-EDGE X-RAY ABSORPTION NEAR EDGE SPECTRA (XANES) OF SOME THIOMETALLATES AND THIOMETALLATO COMPLEXES. JOURNAL OF MOLECULAR STRUCTURE. 1989;198:525-529
(NH4)2[RE2S16], A SOLUBLE METAL SULFIDE WITH INTERESTING ELECTRONIC-PROPERTIES AND UNUSUAL REACTIVITY
No full textMüller A, Krickemeyer E, Wittneben V, Bögge H, Lemke M. (NH4)2[RE2S16], A SOLUBLE METAL SULFIDE WITH INTERESTING ELECTRONIC-PROPERTIES AND UNUSUAL REACTIVITY. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH. 1991;30(11):1512-1514.A strong transannular Re-Re interaction and reactive metal-sulfur bonds characterize the title anion 1 (shown on the right without the two chelating S4-ligands). This surprising result explained by the existence of molecular orbitials arising from Re 5d and S 3p functions of similar energy are not only Re-Re bonding but also markedly delocalized. These findings underline the importance of the role of the metal center, especially in catalytically active metal sulfides
STUDIES ON THE TRIANGULAR CLUSTER [MO3S13]2- - ELECTRONIC-STRUCTURE (X-ALPHA CALCULATIONS, XPS), CRYSTAL-STRUCTURE OF (PH4AS)2[MO3S13].2CH3CN AND A REFINEMENT OF THE CRYSTAL-STRUCTURE OF (NH4)2[MO3S13].H2O
No full textMüller A, Wittneben V, Krickemeyer E, Bögge H, Lemke M. STUDIES ON THE TRIANGULAR CLUSTER [MO3S13]2- - ELECTRONIC-STRUCTURE (X-ALPHA CALCULATIONS, XPS), CRYSTAL-STRUCTURE OF (PH4AS)2[MO3S13].2CH3CN AND A REFINEMENT OF THE CRYSTAL-STRUCTURE OF (NH4)2[MO3S13].H2O. Zeitschrift für anorganische und allgemeine Chemie. 1991;605(1):175-188.The electronic structure of the triangular thio cluster [Mo3S13]2- has been studied by electronic absorption and XP spectra and is discussed in terms of SCF-X-alpha-SW calculations. The synthesis and crystal structure of (Ph4As)2[Mo3S13] . 2CH3CN, which is soluble in organic solvents, are reported together with a refinement of the crystal structure of (NH4)2[Mo3S13] . H2O
ELECTRONIC-STRUCTURE OF THIOMETALATES [MS4](N-) (M=MO, W, RE) - XANES SPECTRA AND SCF-X-ALPHA-SW CALCULATIONS
No full textMüller A, Wittneben V, Diemann E, Hormes J, Kuetgens U. ELECTRONIC-STRUCTURE OF THIOMETALATES [MS4](N-) (M=MO, W, RE) - XANES SPECTRA AND SCF-X-ALPHA-SW CALCULATIONS. CHEMICAL PHYSICS LETTERS. 1994;225(4-6):359-363.Sulfur K-edge XANES spectra of PPh4+ salts of the title species are reported. Assignments for the characteristic positions in the spectra are given and discussed. The energies of the pre-edge peaks and the main absorption edges are used to determine the ''crystal-field' splitting energies DELTA, i.e. the energy difference between the 2e and 4t2 levels (1.4 eV for [ReS4]-, 1.1 eV for [WS4]2-and [MoS4]2-) and the energies of some frontier orbitals (HOMO-LUMO region). These data are compared with results from Xalpha calculations, electronic absorption and ESCA spectra
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
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