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  • Wiley  (22)
  • American Association for the Advancement of Science (AAAS)  (9)
  • Wiley-Blackwell  (6)
  • 2015-2019  (14)
  • 2010-2014  (10)
  • 1980-1984  (9)
  • 1965-1969  (4)
  • 1
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: PE Spectra and Molecular Properties. 89. Ionisation Patterns and Conformation of Cyclo Polythianes (H2CS)nCyclopolythianes (H2CS)n (n = 3, 4, 5) show characteristic low-energy ionization patterns, which are assigned to radical cation states with predominant sulfur lone pair contributions, and the correlation of which with topological eigenvalues ∊JHMO of a perimeter model exhibit the rather low standard deviation of only 0.08 eV. This finding suggests that the sulfur lone pairs should be equivalent on time-averaging. Geometry-optimized SCF calculations concerning preferred conformations as well as molecular flexibility of cyclopolythianes (H2CS)3 and (H2CS)4 in the gaseous phase, yield low barriers for transition between tub and chair conformers and also eigenvalue-sets which correlate with the PE data.
    Notes: Cyclopolythiane (H2CS)n (n = 3, 4, 5) besitzen im niederenergetischen Bereich charakteristische Ionisationsmuster, die Radikalkation-Zuständen mit überwiegendem Schwefelelektronenpaar-Anteil zuzuordnen sind, und deren Korrelation mit den topologischen Eigenwerten ∊JHMO eines Perimeter-Modells die geringe Standardabweichung von nur 0,08 eV aufweist. Dieser Befund legt nahe, daß im zeitlichen Mittel die Schwefel-Elektronenpaare äquivalent sein sollten. Geometrieoptimierte MNDO-Rechnungen über Vorzugskonformationen und zur Molekülbeweglichkeit von Cyclopolythianen (H2CS)3 und (H2CS)4 in der Gasphase ergeben niedrige Barrieren für die Übergänge zwischen Wannen- und Sessel-Formen und zugleich Eigenwert-Schemata, welche sich mit den PE-Daten korrelieren lassen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 464 (1980), S. 209-216 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Comparision of the Hitherto Known cis-Dihydrogenchalcogenido Complexes of d8 MetalsPhosphine-coordinated d8 metal dichlorides react in different ways with hydrogen-sulfide, sodium hydrogensulfide and sodium hydrogenselenide respectively. The phosphine ligand and the YH-providing reactand cut a great figure to get the monomere products. Some reactions of the dihydrogenchalcogenido platinum(II) compounds with sodium ethanolat and elemental sulfur respectively are investigated. I.r. and 1H-n.m.r. spectra are reported.
    Notes: Phosphankomplexierte Dichloro-d8-Metallverbindungen reagieren unterschiedlich mit Schwefelwasserstoff, Natriumhydrogensulfid bzw. Natriumhydrogenselenid. Der Phosphanligand und der YH-liefernde Reaktand spielen eine wichtige Rolle bei der Bildung monomerer Verbindungen. Einige Reaktionen der Dihydrogenchalkogenido-Platin(II)-Verbindungen mit Natriumethanolat bzw. elementarem Schwefel wurden näher untersucht. IR- und 1H-NMR-Spektren sind angegeben.
    Additional Material: 3 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 99-100 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 257-260 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The results of measurements of the thin film growth rate along the wall of long discharge tubes with flowing gas are presented. The dependence of the growth rate distribution along the tube wall on various parameters is discussed. The analysis of the conversion rate of the monomer to thin film material leads to important conclusions on the mechanism of glow polymer film formation.
    Notes: Durch Ausmessen der Profile der Schichtabscheidungsrate entlang der Wand durchströmter langer Entladungsrohre lassen sich deren Abhängigkeiten von den verschiedenen Parametern diskutieren. Speziell die Auswertung des Umsetzungsgrades liefert wichtige Aussagen zum Mechanismus der Glimmpolymerschichtbildung.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 6 (1967), S. 955-956 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 6 (1967), S. 93-93 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2016-03-07
    Description: Well defined productivity-precipitation relationships of ecosystems are needed as benchmarks for the validation of land-models used for future projections. The productivity-precipitation relationship may be studied in two ways: the spatial approach relates differences in productivity to those in precipitation among sites along a precipitation gradient (the spatial fit, with a steeper slope); the temporal approach relates inter-annual productivity changes to variation in precipitation within sites (the temporal fits, with flatter slopes). Precipitation-reduction experiments in natural ecosystems represent a complement to the fits, because they can reduce precipitation below the natural range and are thus well suited to study potential effects of climate drying. Here, we analyze the effects of dry treatments in eleven multi-year precipitation-manipulation experiments, focusing on changes in the temporal fit. We expected that structural changes in the dry treatments would occur in some experiments, thereby reducing the intercept of the temporal fit and displacing the productivity-precipitation relationship downward the spatial fit. The majority of experiments (72%) showed that dry treatments did not alter the temporal fit. This implies that current temporal fits are to be preferred over the spatial fit to benchmark land-model projections of productivity under future climate within the precipitation ranges covered by the experiments. Moreover, in two experiments, the intercept of the temporal fit unexpectedly increased due to mechanisms that reduced either water- or nutrient losses. The expected decrease of the intercept was observed in only one experiment, and only when distinguishing between the late and the early phases of the experiment. This implies that we currently do not know at which precipitation-reduction level or at which experimental duration structural changes will start to alter ecosystem productivity. Our study highlights the need for experiments with multiple, including more extreme, dry treatments, to identify the precipitation boundaries within which the current temporal fits remain valid. This article is protected by copyright. All rights reserved.
    Print ISSN: 1354-1013
    Electronic ISSN: 1365-2486
    Topics: Biology , Energy, Environment Protection, Nuclear Power Engineering , Geography
    Published by Wiley
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  • 8
    Publication Date: 2016-08-21
    Description: Fermi arcs are the surface manifestation of the topological nature of Weyl semimetals, enforced by the bulk-boundary correspondence with the bulk Weyl nodes. The surface of tantalum arsenide, similar to that of other members of the Weyl semimetal class, hosts nontopological bands that obscure the exploration of this correspondence. We use the spatial structure of the Fermi arc wave function, probed by scanning tunneling microscopy, as a spectroscopic tool to distinguish and characterize the surface Fermi arc bands. We find that, as opposed to nontopological states, the Fermi arc wave function is weakly affected by the surface potential: it spreads rather uniformly within the unit cell and penetrates deeper into the bulk. Fermi arcs reside predominantly on tantalum sites, from which the topological bulk bands are derived. Furthermore, we identify a correspondence between the Fermi arc dispersion and the energy and momentum of the bulk Weyl nodes that classify this material as topological. We obtain these results by introducing an analysis based on the role the Bloch wave function has in shaping quantum electronic interference patterns. It thus carries broader applicability to the study of other electronic systems and other physical processes.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 9
    Publication Date: 2015-10-25
    Description: Understanding the role of electron correlations in strong spin-orbit transition-metal oxides is key to the realization of numerous exotic phases including spin-orbit–assisted Mott insulators, correlated topological solids, and prospective new high-temperature superconductors. To date, most attention has been focused on the 5 d iridium-based oxides. We instead consider the Pt-based delafossite oxide PtCoO 2 . Our transport measurements, performed on single-crystal samples etched to well-defined geometries using focused ion beam techniques, yield a room temperature resistivity of only 2.1 microhm·cm (μ-cm), establishing PtCoO 2 as the most conductive oxide known. From angle-resolved photoemission and density functional theory, we show that the underlying Fermi surface is a single cylinder of nearly hexagonal cross-section, with very weak dispersion along k z . Despite being predominantly composed of d -orbital character, the conduction band is remarkably steep, with an average effective mass of only 1.14 m e . Moreover, the sharp spectral features observed in photoemission remain well defined with little additional broadening for more than 500 meV below E F , pointing to suppressed electron-electron scattering. Together, our findings establish PtCoO 2 as a model nearly-free–electron system in a 5 d delafossite transition-metal oxide.
    Electronic ISSN: 2375-2548
    Topics: Natural Sciences in General
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  • 10
    Publication Date: 2011-08-11
    Description: Ionization of the atmosphere due to precipitating solar energetic particles as well as magnetospheric particles is a major source of thermospheric electron density. In this paper we evaluate numerical simulations of the 3-D spatial and temporal electron densities produced by these particle populations through a comparison with incoherent scatter radar observations. The 3-D precipitation patterns are determined with the Atmospheric Ionization Module Osnabrück (AIMOS). We use a version of the general circulation and chemistry model Hamburg Model of the Neutral and Ionized Atmosphere (HAMMONIA) enhanced by ion chemistry to calculate the impact of particle ionization on the electron density. These modeled data are compared to radar observations from European Incoherent Scatter Svalbard and Tromsø as well as the incoherent scatter radar stations at Millstone Hill and Sondrestrom. Particle precipitation is severely affected by geomagnetic disturbance and latitude. Therefore, different locations (inside the polar cap and at auroral latitudes) and geomagnetic conditions are included in the comparison. The main results of the paper can be summarized as follows: (1) as expected, particle forcing will significantly improve modeled electron density in comparison to results of the radar measurements; (2) in particular nighttime comparisons of the electron density are affected; here the particle forcing will account for a boost of 2 to 3 orders of magnitude.
    Print ISSN: 0148-0227
    Topics: Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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