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  • Springer  (106)
  • American Geophysical Union (AGU)
  • MDPI Publishing
  • 1980-1984  (106)
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  • 1
    ISSN: 1572-8927
    Schlagwort(e): Activity coefficients ; emf ; zinc chloride ; water activity ; Pitzer's equations ; solvation cosphere structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The standard potential of the Zn−Hg (sat)/ZnCl2(M)/AgCl/Ag cell was determined at 25°C using several extrapolation procedures and the value 0.9843 V is proposed for E°. The emf of the Zn−Hg (sat)/ZnCl2(M), salt (M)/AgCl/Ag cell [salt=NaClO4, LiClO4, Mg(ClO4)2, Mg(NO3)2] have been measured at different concentrations of salt. From these data, the mean ionic activity coefficients of ZnCl2 are determined and their variations explained with the aid of Pitzer's treatment. It seems necessary to take into account structure in the ionic cospheres in order to explain the observed variations.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1436-5073
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Eine kinetische Methode zur Bestimmung von Spuren Cer(IV) mit Hilfe von Natrium-4,8-diamino-1,5-dihydroxyanthrachinon-2,6-disulfonat wurde beschrieben. Dabei wird ein fluoreszierendes Oxydationsprodukt gebildet, das bei 525 nm angeregt mit einer maximalen Emission bei 585 nm fluoresziert. Die Reaktion ermöglicht die Bestimmung von 0,02–0,37 ppm Cer(IV). Die vorgeschlagene Methode wird nur durch wenige Störungen eingeschränkt.
    Notizen: Summary A kinetic method for determination of traces of Ce(IV), based on the oxidation of sodium 4,8-diamino-1,5-dihydroxyanthraquinone-2, 6-disulphonate is described. The reaction is monitored by means of the fluorescence of the oxidation product (λ ex=525nm,λ em=585 nm), and allows determination of 0.02–0.37 ppm Ce(IV). The proposed method has few interferences.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Publikationsdatum: 1982-05-01
    Print ISSN: 0026-3672
    Digitale ISSN: 1436-5073
    Thema: Chemie und Pharmazie
    Publiziert von Springer
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Rheologica acta 23 (1984), S. 31-39 
    ISSN: 1435-1528
    Schlagwort(e): Volume viscosity ; compressibility ; shift factor ; poly(vinyl chloride)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Physik
    Notizen: Abstract The volume flow of poly (vinyl chloride) ( $$\bar M_n = 45,000$$ = 45,000,T g = 350 K) has been measured in an Instron Capillary Rheometer. The elastic modulus in longitudinal compression, the longitudinal volume viscosity and initial longitudinal volume viscosity, and retardation times were determined at temperatures both below (324 – 343 K) and above (403 – 453 K) the glass transition temperatureT g , and at compression rates between approximately 10−5 and 200 · 10−5 s−1. An increase in the longitudinal volume viscosity was observed for decreases in the volume deformation, increases in the compression rate and increases in temperature.T g decreased at 0.16 K/MPa. The volume flow activation energy was found to be equal to that for shear flow with a constant value of 91.37 kJ/mol.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Springer
    Journal of thermal analysis and calorimetry 28 (1983), S. 381-394 
    ISSN: 1572-8943
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die thermische Zersetzung in Luft von verschiedenen Chrom(III)-Komplexen mit Imidazol,N-Methylimidazol und 2-Methylimidazol wurde im Temperaturbereich von 25-600°C differentialthermoanalytisch, thermogravimetrisch und differentialthermogravimetrisch untersucht. Obwohl das Endprodukt der Zersetzung in allen Fällen Cr2O3 ist, sind doch interessante Unterschiede im Gesamtprozess der Zersetzung zu beobachten. Die Ursachen für diese Unterschiede scheinen mit dem Trans-Effekt und dem Vorliegen von Wasserstoffbrückenbindungen in den Imidazolkomplexen zusammenzuhängen. Die Enthalpien der verschiedenen Zersetzungsreaktionen wurden differentialthermoanalytisch bestimmt.
    Kurzfassung: Резюме С помощью ДТА, ТГ и ДТГ и зучено термическое разложение комплекс ов трех-валентного хрома с имидазолом, N-ме тил- и 2-метил-имидазолом в ат мосфере воздуха и в области температу р 25–600°С. Наблюдали инте ресные различия в процессе п олного разложения этих комп лексов, хотя во всех сл учаях конечным продуктом р азложения являлась окись трехв алентного хрома. Прич ины таких различий обусловлен ы транс-эффек-том и наличием водородны х связей в имидазольн ых комплексах. На основе ДТА опре-делены энтальпии нескольки х реакций разложения.
    Notizen: Abstract The thermal decomposition in air of several complexes of chromium(III) with imidazole,N-methylimidazole and 2-methylimidazole has been studied with the aid of differential thermal analysis (DTA), thermogravimetry (TG) and derivative thermogravimetry (DTG) in the temperature range 25–600°C. Although the final process of the decomposition gives Cr2O3, there are interesting differences in the complete process of decomposition. The reasons for these differences appear to be related to the trans-effect and to the presence in the imidazole complexes of hydrogen bonds. Enthalpies of the several decomposition reactions have been determined by differential thermal analysis.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    Springer
    Astrophysics and space science 86 (1982), S. 55-62 
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A magnetohydrodynamical theorem can be deduced for steady axisymmetric magnetized systems in situations which are usually accepted as representative in interstellar plasmas. It shows that for particular conditions detailed below, magnetic fields have either the direction of the symmetry axis of the system or have field lines encircling this axis of symmetry, but intermediate directions are excluded. Ring galaxies are probably of the second type, which would be important in explaining ring patterns. Our galaxy itself would be of this second type slightly separated from steady state, and the magnetic field radial distribution compatible with the gas content is estimated. The implication of this theorem in actual galaxies is difficult to analyze and gives rise to rather speculative discussions.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Springer
    The European physical journal 21 (1984), S. 353-356 
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper, we discuss the exponential law for proton decay. By using a simple model based uponSU(5)GUT and the current theories of hadron structure, we explicitly show that the corrections to the Wigner-Weisskopf approximation are quite negligible for present day protons, so that their eventual decay should follow the exponential law. Previous works are critically analyzed.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Springer
    Cellular and molecular life sciences 38 (1982), S. 448-449 
    ISSN: 1420-9071
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The cross betweenD. simulans andD. mauritiana yields fertile hybrid females. Crossing-over occurs in such female hybrids. This system allows the transfer of pieces of chromosomes from one species into another, thus providing an experimental tool to analyze the genetic basis of evolutionary problems, as well as the regulation of gene expression during development.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
    Digitale Medien
    Digitale Medien
    Springer
    Il nuovo cimento della Società Italiana di Fisica 2 (1983), S. 1895-1899 
    ISSN: 0392-6737
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Beschreibung / Inhaltsverzeichnis: Riassunto Lo spettro di assorbimento vicino al bordo di assorbimento fondamentale di un cristallo singolo di tipon di CuInSe2, cresciuto col metodo di Bridgman, è stato studiato a 100 e 300 K. Si osserva un bordo di assorbimento in corrispondenza della transizione del gap di banda diretta a circa 1 eV. Un ulteriore assorbimento è osservato a energie inferiori ((0.93÷0.95) eV) ed è attribuito a transizioni dirette alla presenza di fononi ottici a grande lunghezza d'onda.
    Kurzfassung: Резюме При 100 К и 300 К исследуется спектр поглощения вблизи основного края поглощения монокристалла CuInSe2 n-типа, выращенного по методу Ъридгмана, Вблизи 1 эВ обнаружен край поглощения, соответствующий прямому переходу. Дополнительное поглощение наблюдается при меньших энергиях ((0.93÷0.95) эВ) и приписывается прямым переходом, связанным с длинноволновыми оптическими фононами.
    Notizen: Summary The absorption spectrum near the fundamental absorption edge of an-type CuInSe2 single crystal grown by the Bridgman method has been studied at 100 and 300 K. An absorption edge corresponding to the direct-band-gap transition is observed at about 1 eV. An additional absorption is observed at lower energies ((0.93÷0.95) eV) and is attributed to direct transitions assisted by long-wave-length optical phonons.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
    Digitale Medien
    Digitale Medien
    Springer
    Archive for rational mechanics and analysis 75 (1981), S. 257-268 
    ISSN: 1432-0673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract The problem of the linearized vibrations of a viscous, barotropic fluid in a bounded vessel is studied under various boundary conditions. It is shown that the essential spectrum is formed by one or two points that tend to infinity as the viscosity coefficients tend to zero. The asymptotics of solutions of the initialboundary value problem as the viscosity coefficients tend to zero is established. Some remarks about the physical properties of the associated sound waves are given.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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