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  • 1980-1984  (7)
  • 1
    Electronic Resource
    Electronic Resource
    A new mode of X-ray bursts from MXB1730–335 (1980)
    [s.l.] : Nature Publishing Group
    Nature 283 (1980), S. 358-360 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observation was carried out with an X-ray burst monitor which consists of two sets of rotating modulation collimators: two coarse modulation collimators (CMC 1,2) and a fine modulation collimator (FMC 1) with a field of view of 17.4 and 5.8 (FWHM), respectively. Positions of steady sources and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/283358a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vertical structure of hard X-ray flare (1983)
    Springer
    Solar physics 86 (1983), S. 313-321 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper presents studies of the vertical structure of hard X-ray flares for two contrasting examples. The 1981 May 13 flare contained a coronal hard X-ray source which was located above 50000 km above the photosphere. On the other hand, the 1981 July 20 flare had a chromospheric double source structure in the initial phase. Electrons in this case were able to stream freely from the corona to the chromosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00157204
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spin-down episode of the X-ray pulsar Vela X-1 (1981)
    [s.l.] : Nature Publishing Group
    Nature 290 (1981), S. 572-573 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We observed Vela X-l in 8.1-21.8 March (UT) 1979 and in 5.2-24.0 March (UT) 1980 from Hakucho, with its spin axis detectors in the energy range 1-22 keV. The binary period, the duration of eclipse, the pulse profile and its energy dependence are in good agreement with earlier results. The X-ray ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/290572a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Comparison of mouse hepatitis virus strains for pathogenicity in weanling mice infected by various routes (1981)
    Springer
    Archives of virology 70 (1981), S. 69-73 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The pathogenicity for mice of nine strains of mouse hepatitis virus was studied in mice free from the virus by the intracerebral, intraperitoneal, intravenous and intranasal routes of inoculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01320795
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Japanese student activism in the 1970s (1980)
    Springer
    Higher education 9 (1980), S. 139-154 
    Details
    ISSN: 1573-174X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Student movements in Japan have, during the 1970s, tended to move from cooperation between various radical sects to bloody conflict among them, from participation by students generally to involvement by only a limited core of committed activists and from a struggle against the universityand society to one against society alone. The end of the war in Vietnam, the economic crisis, and other societal factors have contributed to these changes. The future of the student movement in Japan cannot be accurately predicted but it is unlikely that a powerful and politically effective movement, such as that of the 1960s, will re-emerge in the near future.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01680430
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation of siloxane-like films by glow discharge polymerization (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 3595-3605 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Glow discharge polymerizations of tetramethoxysilane (TMOS), tetramethylsilane/oxygen mixture (½ molar ratio) (TMS/O2), hexamethyldisiloxane (HMDSO), and tetramethyldisiloxane (TMDSO) were carried out for the preparation of thin, polymeric films with siloxane structures. The chemical composition of the formed polymers was examined by elemental analysis, infrared spectroscopy, and electron spectroscopy for chemical analysis (ESCA) in connection with polymerization conditions, especially, a level of the radiofrequency (rf) input power per mass of the monomers (W/FM value). The polymers prepared from HMDSO at fairly low W/FM values resembled in chemical composition the conventionally polymerized polydimethylsiloxane. The surface properties of the formed polymers also were evaluated by the measurement of surface energy.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070291133
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Using branch-and-bound algorithms to obtain suboptimal solutions (1983)
    Springer
    Mathematical methods of operations research 27 (1983), S. 177-202 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Description / Table of Contents: Zusammenfassung Das Branch-and-Bound-Prinzip kann erfolgreich zur Lösung verschiedener kombinatorischer Optimierungsprobleme eingesetzt werden. In der Regel nimmt der Rechenaufwand jedoch sehr stark mit wachsender Problemgröße zu. Um dieser Schwierigkeit zu begegnen, werden folgende drei suboptimale Methoden oft in der Praxis angewendet: (1) Seien z der Zielfunktionswert der besten bekannten Lösung eines gegebenen Minimierungsproblems undg (P i ) eine untere Schranke für die Zielfunktion des Teilproblems Pi. Dann terminiereP i , fallsg (P i ) ⩾z−∃ (z) ist, wobei∃ (z) eine vorgegebene Fehlerschranke ist. (2) Beende die Rechnung, sobald T0 Teilprobleme bearbeitet worden sind, wobei T0 vorgegeben ist (Beschränkung der Rechenzeit). (3) Berücksichtige stets höchstensM 0 (eine vorgegebene Zahl) aktive Teilprobleme. Die übrigen Teilprobleme weiden ignoriert (Beschränkung des Speicherplatzes). Die Auswirkungen dieser drei Methoden auf die benötigte Rechenzeit und die erhaltenen suboptimalen Lösungen werden theoretisch und an Hand von Simulationen untersucht.
    Notes: Abstract The branch-and-bound principle is successful in solving various combinatorial optimization problems. In general, however, the computation time becomes excessive as the sizes of problems grow. To overcome this difficulty the following three suboptimal methods are often employed in practice. (1) Letz be the value of currently known best solution of a given minimization problem, and letg (P i ) be a lower bound on the objective value of partial problemP i . TerminateP i ifg (P i ) ⩾z−∃ (z), where∃ (z) is an allowance specified in advance. (2) Cut off the computation as soon as T0 partial problems are decomposed, where T0 is a prespecified positive integer. (3) Always take into account at mostM 0 (a given positive integer) number of active partial problems. The overflown partial problems are simply ignored. The effects of these methods on the computation time and the quality of obtained suboptimal solutions are investigated from both theoretical and simulation points of view.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01916914
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    Paper (German National Licenses)
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