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  • Articles  (212)
  • Springer  (212)
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  • Articles  (212)
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  • 1
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    Buchbesprechungen (1983)
    Springer
    Details
    Publication Date: 1983-12-01
    Print ISSN: 0015-8003
    Electronic ISSN: 1439-0337
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1966)
    Springer
    Colloid & polymer science 213 (1966), S. 157-174 
    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/BF01552527
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  • 3
    Electronic Resource
    Electronic Resource
    Einwirkung von Gammastrahlung auf Polytetrafluoräthylen (1967)
    Springer
    Colloid & polymer science 219 (1967), S. 20-29 
    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
    Description / Table of Contents: Summary Effects of gamma radiation of some physical properties of polytetrafluoroethylene resin on four different sorts of PTFE having diverse qualities were estimated. The range of irradiation dose was between 103 and 108 roentgens. The melting point of the polymer, which is determined by DTA, decreases with increasing irradiation dose. The chain scission was estimated by means of the density change of the irradiated PTFE. The chain-length decreases due to the irradiation in air with 5·105 roentgens to the tenth of the starting value. After passing a maximum the elongation at break decreases during irradiation following a hyperbolic function. The tensile strength declines by irradiation dose rates up to 105 roentgens. Higher doses will not influence the tensile values. The decomposition of the PTFE in the presence of air takes place essentially faster than in vacuo, what is evidently to be seen from the more favourable elongations at break and tensile strengths in contrast to the samples irradiated in air, and from the dependence on the density with the irradiation dose. TheG-values of the scission during irradiation in air and in vacuo are estimated and discussed.
    Notes: Zusammenfassung Die Veränderung einiger physikalischer Eigenschaften von PTFÄ nach der Einwirkung von60Co-γ-Strahlung wurde an vier Sorten PTFÄ verschiedener Qualitäten untersucht. Die Strahlendosen lagen zwischen 103 und 108 R. Der durch Differentialthermoanalyse ermittelte Schmelzpunkt des Polymeren nimmt mit steigender Bestrahlungsdosis ab. Die Kettenverkürzung wird an Hand der Dichteänderung des bestrahlten PTFÄ abgeschätzt. Die Kettenlänge sinkt durch Bestrahlung in Luft mit 5·105 R auf den 10. Teil des Ausgangswertes. Die Bruchdehnung sinkt bei Bestrahlung nach Durchlaufen eines Maximums hyperbolisch ab. Die Zugfestigkeit fällt bis zu Strahlendosen von 105 R ab und nimmt dann einen konstanten Wert an. Der Abbau des PTFÄ erfolgt in Gegenwart von Luft wesentlich rascher als im Vakuum, was aus den günstigeren Bruchdehnungen und Zugfestigkeiten gegenüber den an Luft bestrahlten Proben sowie der unterschiedlichen Abhängigkeit der Dichte von der Strahlendosis ersichtlich ist. DieG-Werte der Spaltung bei Bestrahlung an Luft und im Vakuum werden abgeschätzt und diskutiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02086091
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  • 4
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1973)
    Springer
    Colloid & polymer science 251 (1973), S. 613-621 
    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/BF01498590
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  • 5
    Electronic Resource
    Electronic Resource
    An update on the electrolytic conductivity values for the primary standard KCl solutions: Conversion to the ITS-90 temperature scale (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1053-1054 
    Details
    ISSN: 1572-8927
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new international temperature scale has replaced the 1968 scale. Here, we report the changes required in our previous results for primary conductivity standards for 0.01, 0.1 and 1.0 Demal KCl solutions at 0,18 and 25°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650508
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  • 6
    Electronic Resource
    Electronic Resource
    A study of association by hydrogen bonding in the system phenol-CCl4 by the nuclear magnetic relaxation method (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 419-430 
    Details
    ISSN: 1572-8927
    Keywords: Nuclear magnetic relaxation ; hydrogen bonding ; liquid association ; phenol ; carbon tetrachloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The system phenol-CCl4 was studied by measuring proton and deuteron magnetic relaxation rates and self-diffusion coefficients at 25°C. From these data intermolecular relaxation rates have been calculated. By means of an association parameter A, association of phenol molecules with respect to various parts of the molecule has been established. Closest distances of approach between protons and configurations of maximum occurrence probabilities are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658010
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  • 7
    Electronic Resource
    Electronic Resource
    Conductivity of electrolytes and their mixtures: The aqueous HCl-MgCl2 system at low concentrations (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 383-396 
    Details
    ISSN: 1572-8927
    Keywords: Electrolytic conductance ; hydrochloric acid ; ionic mobility ; magnesium chloride ; and mixture effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Onsager-Fuoss-Chen theory of conductance for mixtures has been explored and compared with experimental results for the system HCl−MgCl2−H2O from 5×10−5 to 0.02 mol-kg−1 of water. In the theory, the higher order term O(ka) which involves the ion size parameter has been replaced by a linear term with an empirical constant. The theory including the additional linear term agrees well with the experimental results. The mixture effect on the equivalent conductance is small, but on the individual ionic mobilities is substantial.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00647861
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  • 8
    Electronic Resource
    Electronic Resource
    The dissociation constant of amino acids by the conductimetric method: I. pK 1 of MOPSO-HCl at 25°C (1992)
    Springer
    Journal of solution chemistry 21 (1992), S. 597-605 
    Details
    ISSN: 1572-8927
    Keywords: Amino acids ; degree of dissociation ; electrolyte solution ; equivalent conductivity ; pK 1 ; thermodynamic dissociation constant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The dissociation constants of amino acids are generally determined by acid-base titration and by the emf method. The use of the conductimetric method to obtain pK for amino acids appears to be the first of its kind. In this study, we describe the method of measurement, the treatment of the data and discuss the results. The choice of MOPSO for the investigation is in conjunction with the development of new buffer systems as pH Standard Reference Materials. The value for pK at 25°C is 0.060±0.005.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649566
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  • 9
    Electronic Resource
    Electronic Resource
    Review of electrolytic conductance standards (1987)
    Springer
    Journal of solution chemistry 16 (1987), S. 985-997 
    Details
    ISSN: 1572-8927
    Keywords: Aqueous solution ; cell constant ; conductance ; electrolytic conductivity ; potassium chloride ; primary ; resistance ; resistivity, secondary, standards, and temperature scale
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Measurements of aqueous electrolytic conductance are performed routinely in a variety of disciplines and industries. Conductivity is a measure of the ionic content in solution and thus has applications in pharmaceuticals, power plants, rainwater, lake surveys, and oceanography, to name a few. A thorough review of the measurement of and standards for aqueous electrolytic conductance is herein presented. At present, the most precise and accurate standards have been set forth by the International Organization of Legal Metrology (OIML), and have been adopted by most other standards organizations. However, the uncertainty assigned to these standards, especially the secondary standards, is somewhat larger than would be expected from the physical aspects of the measurement. Several changes in the units and measurement scales, including temperature, volume, molar mass, resistance, and concentration obfuscate the accuracy of these standards. In addition to the review, research is proposed, using a conductance cell with variable length, to establish new standards for aqueous electrolytic conductance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652583
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  • 10
    Electronic Resource
    Electronic Resource
    Determination of the absolute specific conductance of primary standard KCl solutions (1989)
    Springer
    Journal of solution chemistry 18 (1989), S. 515-528 
    Details
    ISSN: 1572-8927
    Keywords: Absolute standard ; conductivity cell ; demal ; electrolyte ; molality ; potassium chloride ; primary standard ; specific conductance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A determination of the absolute specific conductance of KCl solutions is demonstrated. The measurement is based on the conductance cell with a well defined geometry, having a difference in the removable center tube of accurately measured dimensions. The specific conductance of the solution is obtained from the measured resistances of the cell with and without the center tube and the measured l/A ratio of the center tube. Specific conductances obtained using the cell agree with the previously accepted standards for 0.1 demal and 0.01 demal solutions within 0.02%. Results are also presented for solutions based on molality. The temperature control, bridge, and detector technology used to obtain results of this accuracy are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664234
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