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  • 1
    Electronic Resource
    Electronic Resource
    On the Chew-Low plot as a limiting case of the distorted wave theory of break-up reactions (1976)
    Springer
    The European physical journal 277 (1976), S. 147-149 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently developed formulation of break-up reactions in the frame of the DW approximation is compared to a theory of Chew and Low given in 1958. By suitably rewriting the DWBA matrix element, one can pick out a term, dominant for certain kinematical conditions, which is identical to the expression given by Chew and Low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433706
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  • 2
    Electronic Resource
    Electronic Resource
    Experimental and theoretical study of the elastic break-up of the alpha particle on58Ni nuclei atE α=172.5 MeV (1979)
    Springer
    The European physical journal 293 (1979), S. 293-299 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The triton-proton angular correlation function has been measured for the58Ni(α, t p)58Ni reaction leading to the ground state of the target nucleus. The obtained experimental data have been interpreted in terms of the direct break-up (fragmentation) of the alpha particle on the target nucleus potential. It is shown that the main features of the measured double differential cross section are well predicted by the DWBA theory of the break-up. The dependence of the elastic and inclusive break-up cross sections upon the fragment-target interaction potentials is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01435271
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  • 3
    Electronic Resource
    Electronic Resource
    Investigation of electric field induced elastic deformations of nematic liquid crystals by capacity measurements (1978)
    Springer
    Applied physics 17 (1978), S. 177-179 
    Details
    ISSN: 1432-0630
    Keywords: 63.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract An improved set-up is described which is universally applicable in electrooptic research work on liquid crystals. The main part of the test circuit consists of a highly stabilized and dc-free square wave generator with swept amplitude. An additional sine wave modulation with very good linearity up to high voltages allows capacity versus voltage measurements in a large frequency range. Measurements in the nematic phase of ap-disubstituted phenylcyclohexane (PCH) are reported as an example of the high performance of this set-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885252
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Fréedericksz deformation in nematic liquid crystals with frequency dependent dielectric constant (1975)
    Springer
    Applied physics 6 (1975), S. 309-313 
    Details
    ISSN: 1432-0630
    Keywords: Liquid crystals ; Electrooptic effects ; Elastic deformations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The rise and decay times of a Fréedericksz deformation in a planar nematic layer have been investigated. The liquid crystal used was an ester mixture with regimes of positive as well as negative dielectric anisotropy. This property allows to control both the rise and the decay times of the deformation by switching the frequency of the electric field. The kinetics was monitored with a fluorescent dye-probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00883647
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  • 5
    Electronic Resource
    Electronic Resource
    Optical properties of a nematic twist cell (1975)
    Springer
    Applied physics 8 (1975), S. 101-106 
    Details
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We show that many of the complicated static and dynamic optical transmission characteristics of a Schadt-Helfrich twist cell, including the “bounce” in transmission that is observed at negative oblique angles of incidence after switching it off, can be predicted quite well from a very simple dynamic model. The model ignores flow and has only a viscous resistance to angular reorientation, in addition to the Ossen-Frank elastic properties. The bounce observed in some cases with normally incident light cannot be predicted by the model. As expected, the model yields equilibrium configurations at any applied voltage that give the observed transmission very accurately. Dynamic observations in the upper part of the nematic temperature range, where the observed bounce at normal incidence is small, are well reproduced by the model. At lower temperatures the discrepancies are larger. When interpreted with the model, both dynamic and static measurements concur in indicating that the directors of the liquid crystal adjacent to the surfaces assumed a more or less permanent tilt of a few degrees in our cell. Alignment was obtained by rubbing the conducting electrodes in one direction with linen cloth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896027
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  • 6
    Electronic Resource
    Electronic Resource
    Anwendung der Streustrahl-Methode zur Bestimmung der Elemente in Mineralölprodukten mit Hilfe der Röntgenfluorescenz-Spektral-Analyse am Beispiel der Bleibestimmung in Ottokraftstoffen (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 291 (1978), S. 292-298 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei in Benzin, Erdölprodukten ; Röntgenfluorescenz-Spektrometrie ; Streustrahlmethode
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Am Beispiel der Bleibestimmung in Ottokraftstoffen wird gezeigt, daß es möglich ist, die Compton-Streustrahlung einer Röhrenlinie für die Elementbestimmung mittels Röntgenfluorescenzspektrometrie als internen Standard zu benutzen. Anstelle der Compton-Streuung kann ggf. auch die gestreute Röhrenlinie selbst verwendet werden. Die Beziehung zur Konzentration des zu bestimmenden Elementes wird durch eine Vergleichsprobe mit bekannter Elementkonzentration hergestellt. Die Ergebnisse von Bleibestimmungen in Ottokraftstoffen, die nach diesem Verfahren erhalten wurden, stimmen mit den nach anderen Methoden erhaltenen Ergebnissen gut überein, sie liegen weit innerhalb der Vergleichbarkeit nach DIN 51769, Teil 1. Das beschriebene Verfahren ergibt gegenüber dem Verfahren mittels Zumischung eines internen Bezugselementes zur Probe eine Verringerung des Arbeitsaufwandes, eine Erniedrigung der unteren Bestimmbarkeitsgrenze und ggf. eine Vermeidung von Komplikationen durch Interelementeffekte.
    Notes: Summary Taking the determination of the lead content in gasoline as an example, it is shown that the Compton scattering of an X-ray tube emission line may be used as internal standard for determining elements by means of X-ray fluorescence spectroscopy. Also, the scattered tube line itself may be used instead of the Compton scattering. The relationship with the concentration of the element to be determined is established by comparison with a reference sample of known element concentration as an external standard. The results of the determination of lead in gasoline obtained by this method correlate well with those obtained by other methods and are well within the reproducibility limits specified by DIN 51769, Part 1. The method described brings about a reduction in work as compared with the method requiring the addition of an internal reference element to the sample, it brings down the bottom traceability limit and may eliminate complications caused by interelemental effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00491944
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