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  • 1975-1979  (2)
  • 1965-1969  (2)
  • 1
    Electronic Resource
    Electronic Resource
    The decay chain162Yb (19·0 min) →162Tm (21·8 min) →162Er and the decay of160Tm (9·2 min) TO160Er (1975)
    Springer
    Czechoslovak journal of physics 25 (1975), S. 626-643 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The decay of162Yb,162Tm and160Tm has been investigated with Ge(Li) and Si(Li) detectors using isotopically separated samples produced by the YASNAPP facility at Dubna. The singles γ-ray spectrum, β-γ and γ-γ coincidences were measured. Strong ytterbium and thulium activities were used for conversion electron measurements with high resolution magnetic β-spectrographs. 3, 134 and 39 new γ-rays were attributed to the decays of162Yb,162Tm and160Tm, respectively. Decay schemes of these isotopes are proposed. Three and 12 new levels were found in162Er and160Er, respectively. TheQ-values of162Yb,162Tm and160Tm were determined to be ≦2·2, MeV, 4·6±0·3 MeV and 4·9±0·5 MeV, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01591019
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  • 2
    Electronic Resource
    Electronic Resource
    Thermally induced solid state polycondensation of nylon 66, nylon 6-10 and polyethylene terephthalate (1969)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 15 (1969), S. 680-685 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The mechanism of solid state polycondensation has been subjected to a fundamental analysis. Equations were formulated for combined diffusion and chemical reaction for two separate situations. One was for solid state polycondensation in polymer flakes or chips. The other dealt with polymer powders. The resultant solutions related molecular weight changes to rate functions. A technique for deriving the rate functions from experimental data is described.Solid state polycondensations were then studied for nylon 66, nylon 6-10, and polyethylene terephthalate. These data which ranged from 120 to 200°C. were tested with various mechanisms. The most appropriate one was found to be that developed in the present work. Chemical reaction was found to be the rate controlling step in solid state polycondensation in nylon 66, polyethylene terephthalate, powders of nylon 6-10 and larger particles of nylon 6-10 at and above 160°C. Diffusion of byproduct through the solid was the rate controlling step for larger particles of nylon 6-10 at temperatures below 160°C. Thermograms of nylon 6-10 indicated morphological changes which possibly influenced the behavior of the larger nylon 6-10 particles. The Arrhenius relation was fitted to the situations where chemical reaction controlled.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690150510
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Exclusion chromatography using porous glass. II. Application to hydrophilic polymers (1975)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 19 (1975), S. 2933-2945 
    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: A chromatograph employing five columns packed with porous glass of pore size 1250 Å to 75 Å provided peak retention volumes (VR) that were reproducible and essentially independent of sample size and flow rate when aqueous eluents were used. Calibration was carried out with a series of dextran fractions and polystyrene sulfonate samples, both of moderately narrow molecular weight distribution. The universal calibration method, based on hydrodynamic volume, was tested for four different polymer types. All four types produced a common curve within experimental error, which indicates that absolute molecular weight distributions may be derived from aqueous exclusion chromatography data for at least these polymer types. Additional study using a higher salt concentration produced hydrodynamic-volume plots that superposed with those above. The use of the same set of porous glass columns with polystyrene standards in three different organic solvents produced calibration curves that agreed well with the aqueous curves after corrections were made for differences in available pore volumes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1975.070191101
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  • 4
    Electronic Resource
    Electronic Resource
    Radiochemische Messung der Löslichkeit von Bleisulfat (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 339 (1965), S. 208-213 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Using 210Pb as an indicator, the solubility and conductivity of PbSO4 in water and aqueous solutions of Na2SO4 at various concentrations have been measured as functions of the time, partially in 0.5 M NaClO4 medium. PbSO4 shows a strong time dependence of its solubility being due to the slow formation of neutral complexes in the solution. The formation of a disulfato-complex [Pb(SO4)2]2-, however, is not indicated, even in 1 M Na2SO4.
    Notes: Unter Verwendung von Pb-210 wurde die Löslichkeit von Bleisulfat in Wasser und in Natriumsulfatlösungen verschiedener Konzentration als Funktion der Zeit gemessen. Eine Versuchsreihe wurde ohne Zusatz eines weiteren Elektrolyten ausgeführt, eine weitere Versuchsreihe in 0,5 m NaClO4-Lösung. Auch die Leitfähigkeit wurde als Funktion der Zeit verfolgt. Als Besonderheit des Bleisulfats wurde eine stark ausgeprägte Zeitabhängigkeit der Löslichkeit gefunden, die auf die langsame Bildung neutraler Komplexe in der Lösung zurückzuführen ist. Die Bildung eines Disulfatokomplexes [Pb(SO4)2]2- ist jedoch auch in 1 m Na2SO4-Lösung noch nicht erkennbar.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19653390310
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    Paper (German National Licenses)
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