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  • 1990-1994  (6)
  • Engineering General  (3)
  • High-temperature superconducting thin film  (2)
  • 74.70.-b  (1)
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Erscheinungszeitraum
  • 1990-1994  (6)
Jahr
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  • 1
    Digitale Medien
    Digitale Medien
    A new 1223-type high Tc cuprate (Tl, V) Sr2Ca2Cu3O9 (1994)
    Springer
    The European physical journal 93 (1994), S. 159-161 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 74.70.-b ; 74.70.Vy ; 74.60.Mj
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new 1223-type (Tl, V)-based superconducting layered cuprate (Tl1−x V x ) Sr2Ca2Cu3O9 withx=0.25 and 0.50 has been successfully synthesized in the nearly-pure form and identified by powder X-ray diffration analyses. An excessive quantity of Tl is necessary for the preparation of the (Tl, V)-based 1223-type compound. Resistance and ac susceptibility measurements showed that the new (Tl, V)-based 1223 cuprate exhibits Tc above 110 K.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01316958
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  • 2
    Digitale Medien
    Digitale Medien
    Preparation of large-area high-quality YBCO thin films by pulsed laser deposition with Si heater and composite scanning of laser and target (1993)
    Springer
    Journal of superconductivity 6 (1993), S. 335-337 
    Details
    ISSN: 1572-9605
    Schlagwort(e): High-temperature superconducting thin film ; pulsed laser ablation ; heater ; composite scanning ; large area
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract We report on the successful preparation of large-area high-quality YBa2Cu3O7 superconducting thin films by pulsed excimer laser ablation with a Si heater and composite scanning of laser beam and target. The Si heater, composite scanning of laser beam and target, and experiment results are described. The temperature variation of the Si heater was 〈 ±0.5% in a 45×40 mm2 area of 900–1000 °C. Films were deposited on LaAlO3 substrates 35 mm in diameter. The thin films exhibited a thickness variation of ±2.5%; the superconducting properties wereT c0=91×0.5 K andJ c= (3.3±0.7)×106 A/cm2 at 77 K and zero magnetic field.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00617481
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  • 3
    Digitale Medien
    Digitale Medien
    Preparation and properties of YBa2Cu3O7 thin films on sapphire with Yttria-stabilized zirconia buffer layer (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 693-696 
    Details
    ISSN: 1572-9605
    Schlagwort(e): High-temperature superconducting thin film ; pulsed laser ablation ; buffer layer ; sapphire substrate
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: Abstract YBa2Cu3O7 superconducting thin films were deposited onR-plane sapphire substrates with Yttria-stabilized zirconia buffer layer by laser ablation. The structure of the films was characterized by X-ray diffraction. Superconducting transitional temperatures as high as ≥90 K and critical current densities up to 2.2×106 A/cm2 (77 K) were achieved. The results of Auger depth profile showed that no obvious diffusion occurred between the substrate and the YBa2Cu3O7 thin film.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00721649
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  • 4
    Digitale Medien
    Digitale Medien
    A class of difference ABS-type algorithms for a nonlinear system of equations (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Numerical Linear Algebra with Applications 1 (1994), S. 313-329 
    Details
    ISSN: 1070-5325
    Schlagwort(e): Discretization method ; Nonlinear ABS class ; Newton-type method ; Quadratic convergence ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Mathematik
    Notizen: In this paper we give a class of algorithms for solving nonlinear algebraic equations using difference approximations of derivatives. The class is a modification of the original ABS class with the advantage of requiring less function evaluations. Special cases include the methods of Brown and Brent and the discretized Newton method, which is formulated in a way requiring fewer function evaluations per iteration.
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nla.1680010307
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    3D-boundary element analysis of the lowered groundwater level for tunnels driven under compressed air (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    International Journal for Numerical and Analytical Methods in Geomechanics 15 (1991), S. 735-752 
    Details
    ISSN: 0363-9061
    Schlagwort(e): Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Geologie und Paläontologie
    Notizen: A direct boundary element method for the iterative analysis of the lowered groundwater level and the steady-state airflow in porous soil for tunnels driven under compressed air is presented. The soil may be zoned and anisotropic. It is shown that disregard of the compressibility of the air leads to results for the excess air pressure and the flow of air through the surface of the soil, which are on the unsafe side. The lowered groundwater level is determined by means of an iterative procedure. During the iteration large changes of the shapes of boundary elements may occur. In order to reduce the resulting danger of divergence of the iteration, the boundary element mesh is adapted suitably in the course of the iteration process.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/nag.1610151004
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  • 6
    Digitale Medien
    Digitale Medien
    Pressure-based method for combustion instability analysis (1994)
    Chichester : Wiley-Blackwell
    International Journal for Numerical Methods in Fluids 19 (1994), S. 981-995 
    Details
    ISSN: 0271-2091
    Schlagwort(e): Pressure-based method ; All-speed ; Blast wave ; Two-phase flow ; Combustion instability ; Engineering ; Engineering General
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Maschinenbau
    Notizen: An improved pressure-based method has been applied to predict the two-dimensional instability analysis of liquid-fuelled rocket engines. This method is non-iterative for transient flow calculations and applicable to all-speed flows. Validation cases include the shock-tube problem, the blast flow field and unsteady spraycombusting flows. Computations for the combustion instability analysis were carried out for various combustion parameters such as spray initial conditions and combustor geometries. Unsteady behaviours of the stable and unstable spray flame fields and effects of acoustic oscillations on the fuel droplet vaporization and combustion process are studied in detail. The present numerical model successfully demonstrates the capability of predicting combustion instability as well as fast transient compressible flows at all speeds.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fld.1650191103
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