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  • 1980-1984  (4)
  • 1981  (4)
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  • 1980-1984  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Elementary excitations in easy-plane Heisenberg ferromagnets (1981)
    Springer
    The European physical journal 42 (1981), S. 241-244 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the influence of the non-diagnonal terms in an easy-plane Heisenberg ferromagnet on the cross-section for inelastic neutron scattering from single spin-wave states. We show that these terms modify the wavevector dependence of the cross-section for unpolarized neutrons, and the created polarization. An appropriate experiment on CsNiF3, for example, should be a good test of these predictions, and would eventually clarify some uncertainties about the appropriate Boson Hamiltonian for an easy-plane ferromagnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01422028
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Response of metal-insulator-metal point contact diodes to visible laser light (1981)
    Springer
    Applied physics 25 (1981), S. 7-12 
    Details
    ISSN: 1432-0630
    Keywords: 06.30 F ; 07.62 ; 73.40 R
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Video response and mixing behaviour of metal-insulator-metal point contact diodes have been investigated for visible laser light. Thermally enhanced tunneling is shown to dominate the dc detection behavior of those diodes, while mixing of frequencies being more than several MHz apart is a more complex phenomenon involving thermal, field-and photo-assisted tunneling. In further experiments the potential of point contact diodes for optical heterodyne spectroscopy was examined. Two green laser lines of 122 GHz frequency difference were mixed with the second harmonic of an appropriate microwave frequency, generated simultaneously on the diode. The modestS/N ratio achieved has to be assigned to the different behaviour of metal-insulator-metal diodes in the visible and rf range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935384
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Measurement of frequency differences between visible laser lines up to 170GHz using metal-insulator-metal point contact diodes (1981)
    Springer
    Applied physics 26 (1981), S. 19-21 
    Details
    ISSN: 1432-0649
    Keywords: 06.30F ; 07.62 ; 73.40R
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Frequency differences of up to 170 GHz between a cw dye laser and a krypton laser at 568 nm were measured by mixing laser and microware radiation with a metalinsulator-metal point contact diode. Beat signals are well above noise and there is still great potential for improvement when better microwave oscillators are used. From the measurements reported it follows that the diode can be used for determining still higher frequency differences of visible laser radiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00702681
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Zahnkaries in den Kantonen Glarus und Waadt, 4 Jahre und 8 Jahre nach der Einführung fluoridierten Salzes (1981)
    Springer
    Sozial- und Präventivmedizin 26 (1981), S. 302-303 
    Details
    ISSN: 1420-911X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé En 1955 pour la première fois en Suisse, on a ajouté 90 mg de fluor au sel alimentaire (paquet de 1 kg). Ce dosage était trop bas pour empÊcher efficacement le dévelopement de la carie. Plus tard (1970 Vaud, 1975 Glaris) on a augmenté à 250 mg/kg le niveau dans le sel utilisé dans les ménages, les boulangeries, les restaurants et les cantines. Les indices moyens de CAO-dents observés chez les enfants en âge de scolarité avant la fluoruration du sel et après 4 ans de fluoruration pour ce qui est du canton de Glaris et 8 ans pour ce qui est du canton de Vaud, mettent en évidence une diminution de la carie. Il n'y a que dans les classes d'âge où le taux de carie initial était faible que cette diminution n'a pas eu lieu. Il est à noter que ce faible taux de carie initial est dû à und distribution antérieure de comprimés fluorurés.
    Notes: Summary In 1955 for the first time 90 mg of fluoride was added to 1-kg domestic salt packages in Switzerland. This dosage turned out to be too low for an effective inhibition of caries. Later the fluoride level of salt for use in households, bakeries, canteens and restaurants was raised to 250 mg/kg in the cantons of Vaud (1970) and Glarus (1975). Average numbers of DMF-teeth of schoolchildren initially and after 4 years (canton of Glarus) and 8 years (canton of Vaud) of salt fluoridation (250 ppmF) show a reduction of caries experience. Decreases failed to appear only in age classes with initially low caries experience, the latter having been due to previous distribution of fluoride tablets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02078338
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    Paper (German National Licenses)
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