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  • Articles: DFG German National Licenses  (19)
  • 1975-1979  (14)
  • 1965-1969  (5)
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  • Articles: DFG German National Licenses  (19)
Material
Years
Year
Keywords
  • 11
    Electronic Resource
    Electronic Resource
    Isolation of gas vacuole-less mutants of the blue-green alga Anabaenopsis raciborskii (1976)
    Springer
    Archives of microbiology 111 (1976), S. 195-196 
    Details
    ISSN: 1432-072X
    Keywords: Mutation ; Blue-green alga ; Anabaenopsis raciborskii ; Gas vacuole ; Nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract From a bloom forming blue-green alga, Anabaenopsis raciborskii, spontaneous mutants, which had lost the ability to form gas vacuoles have been isolated; the mutant frequency was 4.8×10-3. The filaments of gas vacuole-less mutants settled at the bottom of flasks in liquid culture media unlike the parent alga. The growth and nitrogen fixation were comparatively poor in the mutants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00446569
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    Laser reflectogram method for the study of crystal surfaces and epitaxial deposits (1967)
    Springer
    Journal of materials science 2 (1967), S. 470-473 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract When a collimated beam of light is reflected from an etched crystal surface or an epitaxial deposit, the pattern formed by this reflection provides information on the microscopic morphology of the reflecting surface. Using a He/Ne laser as a source of high-intensity collimated light, both SiC etched in CIF3 and cubic CdS grown epitaxially on GaP have been examined. Certain regions of the SiC were found to give rise to diffraction effects in the resulting reflectrogram. The epitaxial layer of CdS was found to show a threefold symmetry indicative of a {111} deposit and a negligible diffraction effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00562953
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    On the stability of TL traps of alumina (1979)
    Springer
    Journal of materials science 14 (1979), S. 19-24 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Thermoluminescence (TL) of heat-treated (in the temperature range 450 to 1400° C) α-Al2O3 powders have been studied by X-irradiation at room temperature (27° C). The TL patterns have indicated essentially two groups of traps; one in the range 50 to 250° C and the other in the range 200 to 450° C. Apart from other thermal stability characteristics, preferential bleaching by light in the wavelength region of 540 to 630 nm has been observed only in the case of the first group of TL traps. It is concluded that the TL phenomena in α-Al2O3 are in general controlled by trace impurities rather than intrinsic lattice defects and the TL traps of the system may be associated with a distribution of trapped holes (O−, O°) stabilized by trace impurities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01028324
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    On the thermoluminescence of X-ray irradiated polycrystalline Al2O3 powder (1975)
    Springer
    Journal of materials science 10 (1975), S. 1246-1248 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541411
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    Electrical properties of phosphorus diffused GaAs (1976)
    Springer
    Journal of materials science 11 (1976), S. 741-748 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The electrical parameters, i.e. mobility, resistivity and ionization energy, of the dopant (Se) have been determined at different depths in phosphorus diffused GaAs. These values have been compared with those obtained for the epitaxially grown specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209462
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    Effect of intragranular porosity of initial permeability and coercive force in a manganese zinc ferrite (1976)
    Springer
    Journal of materials science 11 (1976), S. 1335-1338 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Initial permeability and coercive force are structure sensitive properties which depend upon intragranular porosity. It has been found that in a manganese zinc ferrite the initial permeability varies directly as the separation between intragranular pores and the coercive force varies inversely as the square root of this distance. Assuming reversible motion of the domain wall pinned at the pores, the behaviour of initial permeability with respect to the distance between the pores can be adequately explained. It is not possible to give an explanation for the observed relationship between coercive force and the distance between the pores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00545155
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    Paper (German National Licenses)
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  • 17
    Electronic Resource
    Electronic Resource
    Effect of high temperature X-ray irradiation on the thermoluminescence of KCI crystals (1975)
    Springer
    Journal of materials science 10 (1975), S. 1643-1645 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01031867
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    Paper (German National Licenses)
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  • 18
    Electronic Resource
    Electronic Resource
    A thermogravimetric study of the oxidation of CuFeO2 (1977)
    Springer
    Journal of materials science 12 (1977), S. 1903-1908 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation kinetics of CuFeO2 have been studied between 500 and 1000° C under various oxygen partial pressures using thermogravimetric analysis (TGA). The oxidation rate was found to increase as the oxygen partial pressure was increased, and for a given partial pressure of oxygen it was found to be maximum at ∼700° C. The enthalpy and activation energy for the oxidation of CuFeO2 were calculated to be ∼26.6±2 and ∼18±2 kcal mol−1 respectively. The oxidation of CuFeO2 resulted in the formation of CuFe2O4 and CuO, and the rate of reaction followed an S-type curve as found in the pearlitic transformation in steels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566252
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    Paper (German National Licenses)
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  • 19
    Electronic Resource
    Electronic Resource
    On the dynamic susceptibility of the bulging domain wall model of polycrystalline magnetic oxides (1978)
    Springer
    Journal of materials science 13 (1978), S. 84-88 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The static initial magnetic susceptibility due to domain wall motion in a polycrystalline magnetic oxide has been explained by Globuset al. [3] using a model of a bulging domain wall inside grains of uniform diameter,D. The present work deals with the dynamic response of this model by solving the equation of motion of such a wall. The resultant solution reproduces Globus' relation for the static case and further shows that the dispersion frequency is ∼D −1 for small grainsizes and ∼D −2 for large grain sizes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00739277
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    Paper (German National Licenses)
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