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  • 2000-2004
  • 1990-1994  (7)
  • 1990  (7)
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Years
  • 2000-2004
  • 1990-1994  (7)
Year
  • 1
    Electronic Resource
    Electronic Resource
    2.5 kHz high repetition rate XeCl excimer laser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5927-5929 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An XeCl excimer laser was operated at the high repetition rate of 2.5 kHz, which can circulate the laser gas uniformly and efficiently. The characteristics of the gas flow rate and the average laser power versus the repetition rate were investigated in both He and Ne buffer gas mixtures. In He buffer gas, the average laser power saturates at 1.3 kHz and, thereafter, drops abruptly. On the other hand, stable operation at the highest repetition rate, 2.5 kHz, has been attained in Ne buffer at a gas flow rate of 54 m/s with an average laser power of 87 W.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346922
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A remote pressure sensing technique by using the photothermal bending effect (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 2692-2695 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Photothermal technique for sensing pressure in a cell is reported. The pressure is monitored from the frequency change of the vibration of the cell itself. The vibration is generated by the photothermal bending effect caused by the chopped laser irradiation, and it is sensed by the deflection of the probe laser beam. The proposed technique is noncontact, and thus it will be useful for remote pressure measurements in hostile environments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141861
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The budding of defective human immunodeficiency virus type 1 (HIV-1) particles from cell clones persistently infected with HIV-1 (1990)
    Springer
    Archives of virology 111 (1990), S. 87-101 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Three cell clones producing large numbers of infectious or noninfectious particles of human immunodeficiency virus type 1 (HIV-1), designated M 10/LAV-2, M 16/LAV-3, and MT/LAV-17, were isolated from persistently HIV-1-infected MT-4 cells. In M 10/LAV-2, the HIV-1 proteins were defective in the cleavage ofgag precursor protein, and the particles were doughnutshaped with a double-ring structure. These particles were produced by budding at the cell surface from crescentic structures followed by the formation of double-ring structures. The viral proteins in M 16/LAV-3 were defective in the cleavage ofenv precursor protein. The morphology of the virus particles was intact, and an electron dense bar-shaped core was seen inside a single-ring enveloped structure. The intact particles were released from the cell surface by a budding process in which crescent shape structures first appeared at the cell membrane, then subsequently just before release matured to a complete structure with an electron dense core. In MT/LAV-17, the synthesis of HIV-1 proteins was normal, and the particles were teardrop-shaped with an intact core structure. These particles were produced by budding with an electron dense core at the cell surface. Thus, it was suggested that the morphological maturation of HIV-1 particles was completed just before release from the cell surface in several cell clones producing HIV-1 particles of different morphology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01310507
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamics for the preparation of SiC-C nano-composites by chemical vapour deposition (1990)
    Springer
    Journal of materials science 25 (1990), S. 4607-4613 
    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 SiC-C nano-composites covering every possible combination of carbon and SiC were prepared by chemical vapour deposition. The specific compositions of the deposits were controlled by changing the Si/C molar ratio in the source gases at deposition temperatures (T dep) of 1673 to 1873 K and total gas pressures (P tot) of 6.7 to 40 k Pa using the SiCl4-C3H8-H2 system. The prediction, based on the thermodynamic calculation on composition, morphology and deposition rate, was compared with experimental results. The optimal deposition conditions predicted by the calculations were nearly in agreement with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01129914
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared absorption ofβ-SiC particles prepared by chemical vapour deposition (1990)
    Springer
    Journal of materials science 25 (1990), S. 4273-4278 
    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 Infrared absorption characteristics ofβ-SiC particles prepared by chemical vapour deposition were studied. These particles were either solid or had a silicon core and/or were hollow. The solid particles exhibited a single absorption peak between the transverse optical frequency (ωTO = 794 cm−1) and the longitudinal optical frequency (ωLO = 976 cm−1) ofβ-SiC. This absorption peak shifted to a lower frequency with increasing lattice parameter ofβ-SiC and increasing free silicon content. The particles containing a silicon core and/or were hollow exhibited double absorption peaks close to ωTO and ωLO. The peak at the LO side shifted to a lower frequency and that at the TO side to a higher frequency with decreasing silicon core size and increasing hollow size. Using the calculations based on the effective medium theory assuming surface phonon mode, the relationship between the infrared absorption characteristics and microstructures of theβ-SiC particles are explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00581084
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    State of boron in chemical vapour-deposited SiC-B composite powders (1990)
    Springer
    Journal of materials science 9 (1990), S. 997-999 
    Details
    ISSN: 1573-4811
    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/BF00727857
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Mössbauer study of permanent magnets Fe-Pt (1990)
    Springer
    Hyperfine interactions 54 (1990), S. 539-544 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Mössbauer effect measurements of57Fe have been performed for Fe-Pt alloys with 36–50 at. % Pt. The spectra are composed of three kinds of sextets for the alloys with 36–40 at.% Pt which have excellent permanent magnet properties in the imperfectly ordered state of a CuAuI-type structure. The magnetic hyperfine field of57Fe is about 25% larger at Pt-sites than at the normal Fe-sites. One of the sextets may be caused by local atomic disorder. The local atomic disorder would be responsible for high coercivity of these alloys.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396086
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    Paper (German National Licenses)
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