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  • 1985-1989  (14)
  • 1980-1984
  • 1960-1964  (13)
  • 1930-1934
  • 1988  (14)
  • 1964  (13)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of Schottky barrier height on EL2 measurement by deep-level transient spectroscopy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2469-2472 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic study of EL2 midgap trap in GaAs using deep-level transient spectroscopy (DLTS) is reported for contacts having a large range of Schottky barrier height. The results show that the DLTS signal of EL2 increases as the barrier height rises from 0.62 eV and saturates for barrier height above 0.83 eV. It is found, for the first time, that for Schottky barrier height lower than 0.62 eV the EL2 signal disappears. A model for calculation of the quasi-Fermi level in the depletion region is used to explain the variation and disappearance of the EL2 signal. This model may also apply to other electron traps near midgap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341655
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  • 2
    Electronic Resource
    Electronic Resource
    The neutralinos of theSU(N,1) minimal supergravity model and standard cosmology (1988)
    Springer
    The European physical journal 40 (1988), S. 591-598 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the effect of the lightest supersymmetric particle (LSP), a Higgsino, and of the gravitino of theSU(N,1) minimal SUGRA model in the standard big bang theory. The freeze out of the LSP depends on the gravitino mass and on the top mass and leads to restrictive lower bounds for these parameters in the model. The decay of a gravitino with mass in the few TeV range leads to a delay in the cooling of the universe before nucleosynthesis. This constitutes the main bound on the gravitino mass of the model. The results are compared with the more standard “simultaneous decay approximation”.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01560230
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  • 3
    Electronic Resource
    Electronic Resource
    Observations on the history of central B-splines (1988)
    Springer
    Archive for history of exact sciences 39 (1988), S. 137-156 
    Details
    ISSN: 1432-0657
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348440
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  • 4
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1964)
    Springer
    Colloid & polymer science 198 (1964), S. 101-111 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01499465
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  • 5
    Electronic Resource
    Electronic Resource
    Über einige zweikernige Heterocyclen (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 615-615 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.196407613163
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemie und Photophysik von 3-(2-Isoxazolinyl)-phenylketonenHerrn Prof. Dr. E. Schmitz zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 735-747 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photochemistry and Photophysics of 3-(2-Isoxazolinyl)-phenylketones3-Benzoyl-Δ2-1,2-oxazolines (1-6) are formed by 1,3-dipolar cycloaddition between benzoylnitril-N-oxide (8) and dihydrofurane 9 or 1,3-dioxep-5-enes (10a-c). The preparative yields are small due to the competitive dimerization of the dipole 8. Two stereoisomers are obtained by using 2-substituted 1,3-dioxep-5-enes as dipolarophiles. The different steric position of the substituents in 3-6 gives rise to different spectral data. The synthesized ketones possess triplet states with a high degree of charge transfer character. Therefore, the ability to H-abstraction reaction from alcohols is small. For ketone 2 and methanol as H-donor a rate constant of kHMeOH = 4,1 · 102 M-1s-1 is determined. Also by electron transfer reactions with triethylamine and some onium compounds the reactivity of the T1 of the ketones 1-6 is less compared to those of nπ* excited ketones. The photolysis of the ketones takes place very unselectively and leads to a product mixture. The quantum yields for the decay of the ketones are 10-2 to 10-3.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300508
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  • 7
    Electronic Resource
    Electronic Resource
    Thiolyse von Sulfurylchlorid (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 130-140 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction of hydrogen sulfide with sulfuryl chloride in the ratio 2:1 leads in benzene solution to hydrogen chloride, water, sulfur, and disulfur monoxide, S2O, which is surprisingly stable under the prevailing conditions. The reaction of sulfuryl chloride with liquid hydrogen sulfide leads to the formation of sulfanes and chlorosulfanes, respectively, besides other products, depending on the molar ratio H2S:SO2Cl2.
    Notes: Schwefelwasserstoff reagiert mit Sulfurylchlorid beim molaren Einsatz 2:1 in benzolischer Lösung unter Bildung von Chlorwasserstoff, Wasser, Schwefel und Dischwefelmonoxid S2O, das unter den herrschenden Reaktionsbedingungen überraschend stabil ist. Mit flüssigem Schwefelwasserstoff bildet SO2Cl2 im Unterschuß u. a. Sulfane, im Überschuß Chlorsulfane.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643300304
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  • 8
    Electronic Resource
    Electronic Resource
    Versuche zur Trennung von Sulfan-disulfonaten mit Hilfe von Anionenaustauschern (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 188-194 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The separation of sulfane-disulfonates, sulfite and thiosulfate by anion-exchangers has been studied. Whereas K2S6O6 is decomposed on the column, the salts K2S3O6, K2S4O6 and K2S5O6 may be separated quantitatively.
    Notes: Die Trennung von Sulfan-disulfonaten, Sulfit und Thiosulfat mit Anionenaustauschern wird untersucht. Während K2S6O6 auf der Säule zu rasch zerfällt, lassen sich die Salze K2S3O6, K2S4O6 und K2S5O6 quantitativ voneinander trennen.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643300311
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  • 9
    Electronic Resource
    Electronic Resource
    Über die Reaktion von Jodwasserstoff mit elementarem Schwefel (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 122-129 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reaction S + 2 HJ → H2S + J2 of S8 solutions in CCl4 is very slow, but is accelerated very much in the case of S6 or Sx* (formed by splitting of S8 rings under the influence of light). A simultaneous determination of content and oxidation state of sulfur in mixtures of sulfur compounds with elemental sulfur by the “HJ method” therefore is only possible if the elemental sulfur is present in the S8 form and if the violet and ultraviolet part of the spectrum is excluded during the experiment.
    Notes: In CCl4 gelöster S8-Schwefel reagiert mit HJ nur sehr langsam nach S + 2 HJ → H2S + J2. Diese Reaktion verläuft dagegen mit S6 bzw. mit den durch Lichteinfluß erzeugten Spaltprodukt des S8-Ringes, Sx*, rasch, weshalb die „Jodwasserstoffmethode“ zur Ermittlung des Gehaltes und der Oxydationsstufe von Schwefel in Gemischen des Elementes mit seinen Verbindungen nur dann anwendbar ist, wenn unter Ausschluß des violetten und ultravioletten Anteils des Spektrums gearbeitet wird und der elementare Schwefel in seiner energieärmsten Form, also als S8-Molekel, vorliegt.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643300303
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Identität der aus Thioschwefelsäure mit Dichlordisulfan und aus Thioschwefelsäure mit salpetriger Säure hergestellten Tetrasulfandisulfonate und zur Existenz eines „Saueren“ Tetrasulfan-disulfonats (1964)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 179-187 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The product prepared following the method of GOEHRING and FELDMANN from H2S2O3 and S2Cl2 is not a „spectrum“ of different salts as stated by WEITZ and BECKER, but really K2S6O6, which is also prepared from H2S2O3 and HNO2. Tetrasulfane-disulfonate does not only exist in the neutral form K2S6O6, but also in a „acid“ form with a part of the potassium - nonstoichiometrically - replaced by H+. The two forms have different shape and X-ray spectra.
    Notes: Bei dem nach GOEHRING und FELDMANN aus H2S2O3 und S2Cl2 dargestellten Produkt handelt es sich nicht, wie von WEITZ und BECKER angegeben, um ein „Spektrum“ verschiedener Salze, sondern um einheitliches K2S6O6, wie es auch aus H2S2O3 und HNO2 erhalten wird. Tetrasulfan-disulfonat existiert neben der neutralen Form K2S6O6 noch in einer „saueren“ Form, bei der ein Teil des Kaliums - nichtstöchiometrisch - durch H+ ersetzt ist. Die beiden Formen unterscheiden sich in Aussehen und Röntgenspektrum voneinander.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19643300310
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