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  • 1970-1974  (3)
  • 1965-1969  (2)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The Chemistry of Bis(monofluorocarbonyl) Peroxide: Generation of the Fluoroformyl Radical and Synthesis of Fluoroformylsulfuryl Fluoride (1966)
    s.l. : American Chemical Society
    Inorganic chemistry 5 (1966), S. 946-949 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50039a055
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Phonons and librons in solid hydrogen and deuterium (1972)
    Springer
    The European physical journal 250 (1972), S. 273-292 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coupled system of phonons and librons is treated in the Random Phase Approximation. The short range correlations are taken into account by an effective Hamiltonian. Dispersion curves and spectra are calculated for both the fcc and hcp phases. All calculations are performed a) with quadrupole-quadrupole forces only b) including the other anisotropic forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395050
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Messungen des Joule-Thomson-Koeffizienten von Wasser und Wasserdampf (1972)
    Springer
    Heat and mass transfer 5 (1972), S. 181-190 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Abstract An experimental apparatus was set up capable of measuring the Joule-Thomson-Coefficient of water and steam. The throttling-element used, with radial flow of the fluid provided the necessary open adiabatic system. The Joule-Thomson-Coefficient of water and steam was measured up to 500 bar and 380 °C. Special attention was given to the measurements in the critical region. The results agree with the values determined from the internationally stated IFC-Formulations. Systematic deviations in the vapour region agree with data found by other authors.
    Notes: Zusammenfassung Zur Messung des Joule-Thomson-Koeffizienten von Wasser und Wasserdampf wurde eine Versuchsanlage errichtet. Die dabei verwendete Drosselstelle mit radialer Strömung des Mediums ermöglicht es, ein offenes, adiabates System experimentell zu verwirklichen. Messungen wurden im Wasser- und im Dampfgebiet bis 500 bar und 380 °C durchgeführt, wobei besonderes Gewicht auf die Messungen im kritischen Gebiet gelegt wurde. Die Ergebnisse stehen in guter Übereinstimmung mit den aus den international vereinbarten IFC-Gleichungssätzen berechneten Werten. Systematische Abweichungen im Dampfgebiet stimmen mit den Messungen anderer Autoren überein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01682666
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Wärmeverluste von beheizten Rohrleitungen im Erdboden (1969)
    Springer
    Heat and mass transfer 2 (1969), S. 109-117 
    Details
    ISSN: 1432-1181
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Abstract An electric analogue (conductive-sheet analogue) is described for the determination of heat-losses and temperature-distribution of pipes embedded in a layer of insulating material in the ground. — Pecularities of the conductive-sheet model as well as simulation of semi-infinite bodies are discussed in detail. For the simplified case of two tubes uninsulated in the ground possibilities of calculation or approximation of heat-losses and temperature-distribution are investigated. In many cases good agreement is obtained between prediction and experimental results. In any case the heat-losses of the steam-pipe show a distinct minimum, depending on the mutual distance of the pipes. This can be explained using the plots of the isotherms.
    Notes: Zusammenfassung Für Rohrleitungen, die in einer Schicht aus Isoliermasse kanalfrei unmittelbar im Erdboden verlegt sind, werden mit Hilfe eines elektrischen Analogieverfahrens (Folien-Modell) die Wärmeverluste und die Temperaturfelder in der Umgebung der Rohre bestimmt. — Die Besonderheiten des Folienmodells, sowie die Nachbildung des halbunendlichen Körpers werden eingehend besprochen. Daneben wird untersucht, inwieweit es für den vereinfachten Fall zweier unisoliert im Erdboden verlegter Rohre möglich ist, Wärmeverluste und Temperaturfelder rechnerisch, u. U. näherungsweise zu ermitteln. Vergleiche der gefundenen Näherung mit den experimentellen Ergebnissen zeigen z. T. gute Übereinstimmung. — Die Wärmeverluste des Dampfrohres zeigen in jedem Fall in Abhängigkeit vom Rohrabstand ausgeprägte Minima, die mit Hilfe der Bilder der Isothermen erklärt werden können.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01089055
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  • 5
    Electronic Resource
    Electronic Resource
    Polysaccharidmetabolismus in den Zellwänden wachsender Keimlinge von Phaseolus aureus (1972)
    Springer
    Planta 102 (1972), S. 334-347 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Quantitative determinations of the cell wall constituents (pectin, hemicellulose and α-cellulose) of growing Phaseolus aureus seedlings showed marked changes during early growth. The cell walls of the 2 to 4 days old seedlings were composed of approximately 30% α-cellulose, 50% hemicelluloses and 20% pectin. After four weeks the proportion of the different fractions had changed to approximately 60% α-cellulose, 30% hemicelluloses and 10% pectin. Quantitative sugar determinations on these polysaccharide fractions have shown that mainly the non-cellulosic fractions (hemicelluloses and pectin) underwent considerable changes in sugar composition during growth. The hemicelluloses contained non-cellulosic polysaccharides with a high glucose content, which were not starch. These were broken down in the cell walls during growth. In a series of experiments in which 14C-glucose was injected into the hypocotyls of four days old Phaseolus aureus seedlings, the transport of radioactivity to the different plant organs and its incorporation into the cell wall polysaccharides of the bean stem were studied. The major part of the radioactivity was incorporated into the cell wall of the stem tissue. Minor amounts were transported to the roots and leaves. Of the cell wall polysaccharides of the stem, the hemicellulosic fraction showed a higher rate of incorporation of the 14C-glucose than the α-cellulose in the early stages of growth. With increasing age of the plant, radioactivity was transferred from the hemicellulosic fraction to the α-cellulose, suggesting turnover of polysaccharides in the growing cell wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00386618
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    Paper (German National Licenses)
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