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  • Articles  (54)
  • Engineering General  (36)
  • 72.40  (10)
  • 42.10  (8)
  • 1975-1979  (54)
  • 1978  (54)
  • Geosciences  (36)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (18)
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  • Articles  (54)
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  • 1975-1979  (54)
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Topic
  • 1
    Electronic Resource
    Electronic Resource
    Statistical properties of the sum of partially-developed, correlated speckle patterns (1978)
    Springer
    Applied physics 17 (1978), S. 159-164 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract General formulas for the average contrast and probability density function of the sum ofN partially-developed, correlated speckle patterns have been theoretically derived. These two parameters characterizing the statistical properties of added speckle patterns have been actually evaluated for the sum of two partially-developed, correlated speckle patterns and shown in figures as a function of the surface roughness of illuminated objects, the wavelength difference of two illuminating lights, and the number of scattering cells within the illuminated area of objects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885249
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  • 2
    Electronic Resource
    Electronic Resource
    Singularity expansions for cylinders of finite conductivity (1978)
    Springer
    Applied physics 17 (1978), S. 239-248 
    Details
    ISSN: 1432-0630
    Keywords: 41 ; 42.10 ; 02
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A new rigorous differential formulation to compute the scattering matrix of an obliquely oriented cylinder of finite conductivity and arbitrary shape is given. The analytic continuation of the scattering operator is examined in the frequency domain as well as in the propagation constant domain. The corresponding computer program is able to compute the singularity expansion for such a cylinder, as well as the propagating mode along it. Numerical examples are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886952
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  • 3
    Electronic Resource
    Electronic Resource
    Hf-sputtered indium oxide films doped with tin (1978)
    Springer
    Applied physics 16 (1978), S. 239-246 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 73
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Indium oxide films doped with tin (ITO-films) have been hf-sputtered from an 80 at-%In2O3/20 at-%SnO2 target onto glass substrates. The sputter atmosphere contained mainly argon (10−2Torr) with addition of oxygen (0≦p O 2≦2·10−2Torr). The sputtered films aren-conductors. The conductivity and density of charge carriers depend on the oxygen content of the sputter gas. They could be varied by two orders of magnitude. In air or in oxygen atmosphere the films oxidize at the surface and for a certain depth beneath the surface, thus decreasing the conductivity. The Hall mobility of the sputtered films is smaller (≈10 cm2V−1 s−1) than one observes at ITO films produced by CVD sparaying or other methods. The conductivity of as sputtered films approached maximum values of about 1000Ώ−1cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885119
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  • 4
    Electronic Resource
    Electronic Resource
    Transient propagation of optical beams in active media (1978)
    Springer
    Applied physics 17 (1978), S. 53-62 
    Details
    ISSN: 1432-0630
    Keywords: 42.10 ; 42.65
    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 coherent interaction of short optical pulses with a nonlinear active resonant medium is calculated. The rigorous and self-consistent solution of the coupled nonlinear Maxwell-Bloch equations including transverse and time-dependent phase variations predicts the onset on an on-resonance self-focusing that agrees very well with a previous perturbation treatment and with recent experiments in sodium and neon. The formation of this dynamic self-action effect is elucidated as being due to the combined effects of diffraction and the inertial response of the active media. Accuracy and computational economy are achieved simultaneously by redistributing the computational grid points according to the physical requirements of the problem. Evenly spaced computational grids are related to variable grids in physical space by a range of stretching and rezoning techniques including adaptive rezoning where the coordinate transformation is determined by the actual physical solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885031
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  • 5
    Electronic Resource
    Electronic Resource
    Photoconductivity and Hall-effect of iron-diffused silicon (1978)
    Springer
    Applied physics 17 (1978), S. 137-140 
    Details
    ISSN: 1432-0630
    Keywords: 71.55 ; 72.20 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Silicon diffused with iron is investigated by photoconductivity and Hall-effect measurements. We used three different iron sources, namely FeCl3, an evaporated iron film, and Fe by ion implantation. Iron exhibits inp-type, boron-doped 1 Ωcm silicon and in high-resistivity (1 kΩcm) silicon an acceptor level ofE c -0.55 eV. No influence of the iron was observed inn-type, phosphorous-doped 0.5 Ωcm silicon. NoE v +0.4 eV level was observed. It is pointed out that iron in silicon must be regarded in connection with at least three parameters, namely the quenching rate, the chemical identity of the shallow dopant, and the initial resistivity of the silicon samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00885245
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  • 6
    Electronic Resource
    Electronic Resource
    LiTaO3 as holographic storage material (1978)
    Springer
    Applied physics 15 (1978), S. 133-139 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 42.30 ; 78.20
    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 optical storage properties of LiTaO3:Fe are investigated and compared with those of the isomorphous compound LiNbO3:Fe. Absorption, photocurrent, photoconductivity and holographic measurements are reported. In the case of photovoltaic writing similar results for LiTaO3- and LiNbO3-crystals are obtained. However, in the case of photoconductive writing using external electric fields LiTaO3:Fe-crystals yield much better results due to large photoconductivity values. Considering the recording sensitivity and the extremely large storage time LiTaO3:Fe turns out to be one of the most promising materials for photorefractive storage of volume phase holograms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00928197
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of tunneling effects on the efficiency of heterojunction solar cells (1978)
    Springer
    Applied physics 15 (1978), S. 413-422 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 85.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A theoretical model is developed which presents the transport properties through the space charge region of ap + n heterojunction solar cell, whereby not only recombination through interface states but also tunneling through potential barriers is taken into account. It is investigated whether tunneling can give rise to optimum heterojunction structures which have better efficiencies that without tunneling. It is found that only if the strongly doped semiconductor has an optimum bandgap and the weakly doped semiconductor a larger bandgap, tunneling can make the structure optimum. In all other cases of optimum structures, tunneling deteriorates the efficiency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886161
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  • 8
    Electronic Resource
    Electronic Resource
    Theory of the photon-drag effect inp-type germanium with a parabolic and anisotropic band-structure approximation (1978)
    Springer
    Applied physics 15 (1978), S. 433-438 
    Details
    ISSN: 1432-0630
    Keywords: 72.40 ; 07.62
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper shows that many features of the photon-drag voltage generated by illumination ofp-germanium with 10.6 μm radiation can be understood on the basis of a parabolic but anisotropic band-structure model. The group velocities of the heavy and light holes participating in the optical transitions are obtained by an analysis of the conservation laws. Since the nonequilibrium hole densities in both bands depend directly on the momentum relaxation times in the determinant equations of continuity, these times are the parameters with the strongest influence on the numerical results. The photon-drag voltage consists of components longitudinal and transverse with respect to the axis of illumination. For the longitudinal components, good agreement between our theoretical results and experimental data from the literature is achieved if the crystal is illuminated along a [100] or [111] direction. Though a transition probability independent of light polarisation has been assumed, the transverse effect (illumination along [111]) can be computed for special measuring conditions. The calculated effects of anisotropy are higher than known from experiments possibly due to the approximations used for the valence bands and the transition probability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886164
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  • 9
    Electronic Resource
    Electronic Resource
    Nonlinearity of the photon-drag voltage at high laser intensities (1978)
    Springer
    Applied physics 15 (1978), S. 89-92 
    Details
    ISSN: 1432-0630
    Keywords: 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Experiments on the nonlinear behavior of the photon-drag voltage inp-Ge were carried out with CO2-laser light of intensities up to 80 MW/cm2. The nonlinearity turned out to be in sufficient agreement with a theory based on the consideration of intraband photoconductivity and recent absorption saturation data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896896
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  • 10
    Electronic Resource
    Electronic Resource
    Coherence and beam geometry of a superradiant dye laser (1978)
    Springer
    Applied physics 15 (1978), S. 281-286 
    Details
    ISSN: 1432-0630
    Keywords: 42.60 ; 42.10
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper reports the observation of a well defined radiation mode emitted from a superradiant dye laser pumped by a pulsed nitrogen laser. Beam geometry and spatial coherence of the dye laser are studied in connection with the pumping geometry. It is shown that under favorable pumping conditions most of the excited molecules radiate into the same spatial mode by stimulated emission. The associated mode structure is also calculated based on a model of a properly phased dipole distribution. The calculated emission pattern reproduces the observed far field pattern closely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896109
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