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  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 67 (1984), S. 361-372 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The temperature dependence of the water self-diffusion coefficients (D), as well as those of low- and high-field (stationary and time-dependent) specific conductivities (K), have been determined in the percolation regime of ternary mixtures of water, AOT, and oil. For the first time a pronounced similarity in the behavior of D and κ was detected giving instructive hints about the large variations in the specific conductivities of these systems. Results from kinetic and stationary experiments are consistent with a network-structure model of micro phases in the percolation regime in which the micro phases retain their discrete character.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 65 (1982), S. 170-177 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The water activity and its temperature dependence as a function of the amount of water in the L2-phase of the (water/Aerosol OT/isooctane)-system (s. Exper. Part) was determined with the help of a differential pressure gauge and a precision cathetometer. A theoretical approach based essentially upon a solution of the Poisson-Boltzmann equation with appropriate boundary conditions led to a description of the activity plot in excellent agreement with experimental results.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 66 (1983), S. 1569-1573 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: O'Konski's considerations regarding the distortion of spherical droplets by electric fields in binary two-phase systems has been extended to three-component water/surfactant/oil systems with so-called ultra-low interfacial tensions, i.e. spherically aqueous microphases. It is shown that the deformation is almost negligible for fields up to about 5 105 Vm-1 such as those applied in electro-optical Kerr-effect measurements with microemulsions if only perturbations of the mean orientation of the surfactants in the interface are considered.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1616-7228
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Zusammenfassung Im Jahre 1981 wurden im Bereich der westlichen und mittleren Ostsee auf zwei Fahrten Wasserproben aus verschiedenen Tiefen zur Untersuchung auf ihren Gehalt an künstlichen Radionukliden entnommen. Im April war im südlichen Kattegat, im Großen Belt und in der westlichen Ostsee die bereits aus den Untersuchungen früherer Jahre bekannte Vertikalverteilung mit hohem Salzgehalt und hohen Aktivitätskonzentrationen des Cs 137 im Tiefenwasser und entsprechend geringeren Werten dieser Parameter im Oberflächenwasser (Kautsky [1981]) festzustellen. Dagegen ließ sich im Dezember im gleichen Bereich eine gute Vertikaldurchmischung des Wasserkörpers mit annähernd gleichem Salzgehalt und gleichen Aktivitätskonzentrationswerten im Oberflächen- und Tiefenwasser beobachten. Das gesamte Verteilungsbild der Aktivitätskonzentrationen des Cs 137 und Sr 90 hat sich aber im untersuchten Bereich und insbesondere in der mittleren Ostsee gegenüber dem Vorjahr nur wenig verändert.
    Abstract: Résumé Lors de deux campagnes effectuées en 1981 dans la partie Ouest de la mer Baltique et en Baltique proprement dite, on a prélevé des échantillons d'eau à différentes immersions pour étudier leur contenu en radio nucléides artificiels. La distribution verticale qui apparaît déjà dans des recherches effectuées précédemment et qui présente un haut degré de salinité, un fort taux d'activité de137Cs en eau profonde et des valeurs moindres en surface de ces paramètres (Kautsky [1981]), a été observée à nouveau en avril dans la partie Sud du Kattegat, dans le Grand Belt et en Baltique Occidentale. Par comparaison, on a relevé en décembre, dans la même région, un bon mélange vertical de l'eau avec des valeurs de salinité et d'activité presque égales en surface et en eaux profondes. Cependant, le modèle complet de distribution des concentrations d'activité de137Cs et de90Sr dans la région étudiée et, en particulier, en Baltique proprement dite, n'a présenté que très peu de changement par rapport à l'année précédente.
    Notes: Summary In 1981, during two cruises in the region of the western Baltic Sea and the Baltic Proper, water samples were taken from different depths for investigation of their content of artificial radio nuclides. In April, in the southern Kattegat, the Great Belt, and the western Baltic Sea, the vertical distribution already known from the investigations we carried out in earlier years showing high salinity and high137Cs activity concentrations in deep water and correspondingly lower values of these parameters in surface water (Kautsky [1981]) was observed again. In comparison, in December—in the same region—a good vertical mixing of the waterbody was found with nearly equal salinity and activity concentration values in the surface and deep waters. However, the entire distribution pattern of the activity concentrations of137Cs and90Sr in the region of investigation, and particularly in the Baltic Proper, had changed only very little compared with the previous year.
    Type of Medium: Electronic Resource
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