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  • 1970-1974  (5)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    The role of surface and volume diffusion in the growth of TGS single crystals (1973)
    Springer
    Czechoslovak journal of physics 23 (1973), S. 261-272 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Msasurements of the growth rates of {110} and {001} faces of triglycinsulphate (TGS) as functions of supersaturation of the solution are analyzed on the basis of the surface-diffusion model of Burton, Cabrera and Frank. Approximate values of the free activation energies of dehydratation, surface diffusion and incorporation of TGS molecules into the crystal lattice are determined. It is shown that surface diffusion is responsible for the low growth rate of {001} faces; in the case of {110} faces, this mechanism is less important at higher values of supersaturation than volume diffusion. This fact is discussed on the basis of results obtained from measurements of the influence of hydrodynamical conditions on the growth of the prismatic {110} faces of TGS crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01587251
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Single crystals of triglycine sulphate containing palladium (1973)
    Springer
    Czechoslovak journal of physics 23 (1973), S. 855-862 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Single crystals of TGS doped with Pd2+ have been grown from aqueous solutions using the method of temperature decrease. It was found that the relative growth rate along thec-axis is not constant through the growth process being larger by more than an order of magnitude (in medium size crystals, ca. 30 g) than in pure TGS crystals. Investigation of the domain structure revealed that in the growth pyramids ¦110¦, the crystals are poled in one direction. The internal bias field in these growth pyramids was experimentally found to be of the order of 1 kV/cm. The high internal field excludes the possibility of spontaneous depoling and makes the Pd2+-doped TGS crystals suitable for pyroelectric applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01587280
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On the plane gravitational condensor with the positive gravitational constant (1974)
    Springer
    Czechoslovak journal of physics 24 (1974), S. 718-724 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The equations of motion for the plane shell consisting of an ideal fluid and creating the de Sitter solution on one side and the static plane symmetric solution of Einstein equations with positive cosmological constant on the other side are derived. Solution of the equation of motion for the case of “plane gravitational condensor” is found and the necessary agreement with the solution of the problem in the caseA = 0 is demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01795706
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of surface emittance and approximate kernels in radiation-conduction interaction (1970)
    Springer
    Heat and mass transfer 3 (1970), S. 1-6 
    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: Zusammenfassung Repräsentative Resultate der Wechsel-wirkung zwischen Leitung und Strahlung eines nicht grauen Gases, zwischen zwei unendlichen, parallelen, grauen Platten, werden mitgeteilt. Der Einfluß des Reflexionsgrades der Platten auf die Wechselwirkung zwischen Leitung und Strahlung für diffuse Oberflächen wird untersucht; ebenso ein spezieller Fall von einer schwarzen Platte kombiniert mit einer diffus strahlenden und spiegelnd reflektierenden Platte. Zusätzlich wird die Genauigkeit der Näherung eines eingliedrigen Exponential-Kernes diskutiert.
    Notes: Abstract Representative results are presented for nongray radiation-conduction interaction in a radiating gas bounded by two gray infinite parallel plates. The effect of the surface emittanee on the interaction of radiation with conduction for diffuse surfaces and a special case of one black surface combined with a diffusely emitting, specularly reflecting surface is investigated. Additionally, the accuracy of the one-term exponential kernel approximation is examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881217
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Geometric interpretation of chronometric invariants in general theory of relativity (1971)
    Springer
    Czechoslovak journal of physics 21 (1971), S. 809-812 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The geometric interpretation of Zelmanov's Chronometric invarians is given and their conection to observable quantities as well as the connection of Zelmanov's approach to the generally covariant Dehnen's method is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01702988
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    Paper (German National Licenses)
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