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  • Articles: DFG German National Licenses  (24)
  • 1990-1994  (22)
  • 1945-1949  (1)
  • 1935-1939  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Polarographic Estimation of Vitamin C (1938)
    [s.l.] : Nature Publishing Group
    Nature 142 (1938), S. 35-35 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] AQUEOUS solutions of vitamin C when electrolysed at the dropping mercury cathode do not produce any effect on the current-voltage curves. If, however, to a solution of vitamin C—freed from air—a mild oxidizing agent, such as cupric chloride, silver nitrate, gold chloride, ferric chloride or ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/142035a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The presence of riboflavin in the luminous material of the earthworm (1949)
    Springer
    Cellular and molecular life sciences 5 (1949), S. 73-73 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung In den Lymphozyten derEisenia submontana ist ein Leuchtmaterial vorhanden, das Riboflavin enthält. Mit Hilfe der Papierchromatographie konnte nachgewiesen werden, daß Riboflavin hier als solches, nicht aber als Flavinphosphat oder als Flavin-adenin-dinukleotid vorliegt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02153732
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystallization kinetics of isotactic polypropylene blended with atactic polystyrene (1990)
    Springer
    Colloid & polymer science 268 (1990), S. 528-535 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylene/polystyreneblends ; nucleation ; isothermalcrystallization ; spheruliticgrowth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Crystallization kinetic parameters, such as spherulitic growth rates, nucleation densities, and Avrami-exponents, have been determined by optical microscopy for isotactic polypropylene blended with atactic polystyrene. It is found that the crystallization of iPP is strongly influenced by the presence of polystyrene. With increasing PS concentration in the blend, the nucleation densities decrease, while the spherulitic growth rates as well as the positions of thermal peaks, measured by DSC, remain independent of sample composition. Due to the formation of interfaces as a consequence of increasing dispersion of polystyrene the nucleation changes from preferentially thermal to athermal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410294
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Transfer of load from matrix to fiber in self-reinforced polymer composites (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1212-1223 
    Details
    ISSN: 1435-1536
    Keywords: Self-reinforced polymer composites ; mechanical properties ; interface ; transfer of load
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The tensile properties of self-reinforced polypropylene composites, obtained by rapid extension of an isotactic polypropylene/atactic polypropylene melt, have been measured and correlated to morphological parameters derived from x-ray experiments. The longitudinal morphology of the core-fibrils is found to be independent of sample composition, while the lateral thickness of the fibers varies between 220 Å for iPP and 110 Å for the blend containing 50 wt.% aPP. Critical fiber lengths, as a function of sample composition and the elastic modulus and the yield stress of the fibers, could be determined. While the number of corefibrils increases with mass fraction of atactic polypropylene, the length of the lateral interface between fiber and matrix and the interface volume decreases with increasing aPP mass fraction. It is shown that this interface is responsible for the mechanical behavior of the composite by effecting the transfer of load from matrix to fiber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652530
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  • 5
    Electronic Resource
    Electronic Resource
    Interactions between the components in isotactic polypropylene blended with EPDM (1993)
    Springer
    Colloid & polymer science 271 (1993), S. 824-833 
    Details
    ISSN: 1435-1536
    Keywords: Polypropylene ; EPDM ; interphase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The interaction of isotactic polypropylene with ethylene propylene diene terpolymer in their blends has been investigated by use of differential scanning calorimetry, dynamic mechanical analysis, wide- and small-angle x-ray scattering, and by investigating the nucleation and kinetics of crystallization of the iPP component under the polarization microscope. It is found, that the dispersion of the EPDM component in the iPP matrix is dependent on blend composition and is maximal at 10% EPDM content. An interface layer between the two components is formed by migration of iPP molecules into the EPDM phase. A model for this interface is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652764
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  • 6
    Electronic Resource
    Electronic Resource
    The impact of taxation on the distribution of wealth in an economy with changing population (1990)
    Springer
    Journal of population economics 3 (1990), S. 53-71 
    Details
    ISSN: 1432-1475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract The paper investigates into the determinants of the personal distribution of income and wealth. In an overlapping generations model all individuals are assumed to be identical except for their inherited wealth. Since life time is random the bequest of an individual and thus the inherited stock of capital of its children are stochastic variables. Taxation and social security contributions affect life cycle savings, bequests, and, eventually, the distribution of income and wealth in the society. It is shown that, in general, higher tax rates reduce distributive inequality as long as the rate of interest is exogenously given. In steady state, however, where the rate of interest is determined endogenously, increasing taxation and higher social security payments both diminish the capital labor ratio so that the rate of interest rises. If this interest effect is strong enough then it may outbalance the tendency toward more equality because higher interest rates enhance initial differences in the distribution of both income and wealth and, eventually, the inequality in the distribution of income and wealth in the society.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00160417
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Metastable crystal modifications in polypropylene injection mouldings (1993)
    Springer
    Journal of materials science 12 (1993), S. 1655-1656 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: 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/BF00418820
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of compatibilizers on the morphology of isotactic polypropylene/linear low-density polyethylene blends (1993)
    Springer
    Journal of materials science 28 (1993), S. 1685-1688 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The morphology of isotactic polypropylene (iPP)/linear low-density polyethylene (LLDPE) blends, compatibilized with ethylene-propylene block copolymer (EP) and two types of styrene-ethylene/butylene-styrene triblock copolymer (SEBS), one containing maleic anhydride, the other no reactive sites, has been investigated by using small-angle X-ray scattering by evaluating their interface distribution functions. To characterize the crystallization behaviour of the blends, their spherulitic growth rates have been measured under the polarizing microscope and nucleation and crystallization kinetics data have been evaluated. The addition of LLDPE to iPP alone has a pronounced effect on the lamellar morphology of the iPP. Adding compatibilizer to the iPP/LLDPE blend leads to a further decrease of the lamellar thickness. Concurrently the nucleation density increases while the Avrami exponent drops from n∼2.3 for iPP to n=0.74 for the iPP/LLDPE/SEBS blend. It is concluded that the compatibilizer causes the polyethylene component to become more highly dispersed in the polypropylene matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363368
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Thermal analysis of the crystallization behaviour of compatibilized polypropylene/polyethylene blends (1994)
    Springer
    Journal of materials science 13 (1994), S. 863-864 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: 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/BF00273231
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic mechanical analysis of the interpenetration of polypropylene andtrans-polyoctenylene in isotactic polypropylene-trans-polyoctenylene (1992)
    Springer
    Journal of materials science 11 (1992), S. 1525-1526 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: 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/BF00729279
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