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  • 1970-1974
  • 1965-1969
  • 1955-1959  (2)
  • 1959  (2)
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Years
  • 1970-1974
  • 1965-1969
  • 1955-1959  (2)
Year
  • 1
    facet.materialart.
    Unknown
    Lability in schizophrenia (1959)
    London, etc. : Periodicals Archive Online (PAO)
    British journal of psychology. 50 (1959) 333 
    Details
    ISSN: 0007-1269
    Topics: Psychology
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:0047-1959-050-00-000037
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    The dielectric and piezoelectric behaviour of pyrolusite (polycrystalline ore of MnO2) (1959)
    Springer
    The European physical journal 155 (1959), S. 465-471 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The variation of dielectric constantɛ of pyrolusite (sintered polycrystalline ore of MnO2) with temperature, frequency and voltage has been studied within the frequency range 200 c/s to 10 kc/s. The samples studied show a very high value of dielectric constant ≈ 105. Theɛ-temperature curve indicates thatɛ attains a maximum value at a certain temperature. The temperature at whichɛ attains a maximum value appears to vary from sample to sample. At higher temperatures (i.e. higher than that at whichɛ attains a maximum value),ɛ decreases with temperature asɛ=c/(T−Θ). The dielectric constant is dependent on the frequency; it has a higher value at lower frequencies. The applied voltage across the specimen has a marked influence on the dielectric constant, which increases rapidly with voltage. A capacity with pyrolusite as dielectric shows a hysteresis loop (electrical). The dielectric loss factor tanδ is found to depend on temperature, frequency and voltage. Tanδ attains a maximum value at lower range of frequencies between 300 c/s to 700 c/s, for a given voltage, and temperature. This indicates the existence of dielectric relaxation for these specimens. Tanδ also varies exponentially with temperature. Samples of pyrolusite studied show a piezo electric effect as well. The electromechanical coupling coefficient is found to vary from 2·4×10−5 to 8·8×10−5 e.s.u/ dyne. Slabs cut from the samples of pyrolusite mineral were found to control the frequency of a Hartley oscillatory circuit. The resonant frequency range was found to increase as the thickness of the slab is reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333126
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