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  • Articles: DFG German National Licenses  (7)
  • Electronic Resource  (7)
  • 1980-1984  (6)
  • 1975-1979  (1)
Source
  • Articles: DFG German National Licenses  (7)
Material
  • Electronic Resource  (7)
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 86 (1982), S. 1015-1018 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 39 (1983), S. 38-46 
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The resolution function of a three-axis, X-ray spectrometer is considered for the case when the monochromator and analyser crystals are ideally perfect. It is shown that, for X-ray sources which produce either an ill-collimated monochromatic beam (conventional source) or a well-collimated white beam (synchrotron radiation), the resolution problem may be simplified. This simplification allows the profile of an arbitrary section of the resolution function to be expressed as a one-dimensional integral of the product of three functions; one to represent the source characteristics and the other two to describe the Darwin profiles of the monochromator and analyser crystals. The formalism is extended to describe the measurement of the resolution function by a perfect crystal mounted on the sample table of the spectrometer. Comparison of the a priori calculations with measurements made on a spectrometer at a conventional source yields very good agreement.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 13 (1980), S. 284-289 
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A position-sensitive detector (PSD) for Mo Kα radiation has been successfully applied to detect very weak X-rays diffracted from an extremely small volume of specimen compressed in a diamond-anvil high-pressure cell. The PSD can cover a scattering-angle range of 22.6° with an angular resolution of 0.038: in a single measurement. Remarkably rapid recording of diffraction patterns with a high S/N ratio is performed with this method at pressures higher than 10 GPa. Some diffraction patterns of iodine near the insulator-metal transition around 16–18 GPa are shown to demonstrate the usefulness and power of this PSD system.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neural transmission 54 (1982), S. 29-39 
    ISSN: 1435-1463
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Sympathetic innervation to the melanophores of a siluroidParasilurus has been the sole instance of such innervation among lower vertebrates, in which the peripheral transmission to the effector cells is peculiarly cholinergic (Fujii andMiyashita, 1976). In an effort to find a similar case, we studied the nature of transmission to melanophores of a glass catfishKryptopterus. Electrical nervous stimulation brought about melanosome aggregation in the melanophores. While catecholamines were found ineffective, acetylcholine and its analogues were potently active in aggregating pigment. Atropine or scopolamine interferred with the action of both nervous stimulation and acetylcholine. Physostigmine, on the other hand, augmented the cholinergic effects. The conclusion was that the transmission was cholinergic, being mediated by cholinoceptors of muscarinic type, as in the case ofParasilurus.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Computing 23 (1979), S. 85-97 
    ISSN: 1436-5057
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es wird eine Intervall-Methode zur Auffindung der globalen Maxima oder Minima von Funktionen mehrerer Veränderlicher beschrieben. Der Definitionsbereich der Variablen wird sukzessiv unterteilt. In jedem Teilgebiet werden die obere und die untere Grenze des Intervall-Ausdrucks der Funktion berechnet. Durch Weglassen von Teilgebieten, welche die Lösung nicht enthalten, können wir immer die Lösung zusammen mit exakten Fehlerschranken finden. Durch Gruppierung der Teilgebiete kann die Konvergenz mit Newtons Methode beschleunigt werden. Extremwertaufgaben mit Nebenbedingungen behandeln wir mit einer speziellen Transformation oder Lagrangeschen Multiplikatoren.
    Notes: Abstract An interval arithmetic method is described for finding the global maxima or minima of multivariable functions. The original domain of variables is divided successively, and the lower and the upper bounds of the interval expression of the function are estimated on each subregion. By discarding subregions where the global solution can not exist, one can always find the solution with rigorous error bounds. The convergence can be made fast by Newton's method after subregions are grouped. Further, constrained optimization can be treated using a special transformation or the Lagrange-multiplier technique.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    GeoJournal 4 (1980), S. 303-311 
    ISSN: 1572-9893
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 15 (1980), S. 2661-2662 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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