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  • 1
    Electronic Resource
    Electronic Resource
    Electrical transport properties of CoSi2 and Co(SixGe1−x)2 films formed by different methods (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5427-5432 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The electrical transport properties of CoSi2 and Co(SixGe1−x)2 thin films formed by solid state interaction and co-evaporation in the range of 4–300 K were studied. The Hall effect data indicate a hole carrier conduction in all samples. The rapid thermal annealed CoSi2 exhibits a typical metallic conduction with a residual resistivity of 3.3-μΩ-cm and room-temperature (RT) resistivity of 15 μΩ cm. The co-evaporated CoSi2 and Co(Si0.9Ge0.1)2 films after low temperature annealing up to 250 °C show a low resistivity of 70–80 μΩ cm at RT and change little down to 4 K. The hole carrier density of all the samples studied has values close to 2–3×1022 cm−3, while the carrier Hall mobility has large differences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350200
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High critical current densities in YBa2Cu3O7−x thin films formed by metalorganic chemical vapor deposition at 730 °C (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 648-650 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: YBa2Cu3O7−x superconducting thin films with a critical current density of 2.3×106 A/cm2 at 77.7 K and 0 T were prepared by a metalorganic chemical vapor deposition process. The films were formed in situ on LaAlO3 at a substrate temperature of 730 °C in 2 Torr partial pressure of N2O. Resistivity and magnetic susceptibility measurements of the as-deposited films show a sharp superconducting transition temperature of 89 K with a narrow width of less than 1 K. Critical current densities were measured by the dc transport method with a patterned bridge of 120 μm×40 μm. Both x-ray diffraction and high-resolution electron microscopy measurements indicate that films grew epitaxially with the c axis perpendicular to the surface of the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104557
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reduction of calcium excretion in the stone-forming kidney in unilateral ureteral obstruction (1991)
    Springer
    Urological research 19 (1991), S. 193-198 
    Details
    ISSN: 1434-0879
    Keywords: Urolthiasis ; Obstructive uropathy ; Percutaneous nephrostomy ; Hypercalciuria ; Creatinine clearance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Thirteen urolithiasis patients with unilateral obstructive uropathy were treated with percutaneous nephrostomy (PCN) either for urinary diversion, endopyelotomy, nephrolithtotmy or chemolysis. After percutaneous nephrostomy, the indvidual urine volume, creatinine clearance (Ccr), urinary absolute and fractional excretions of sodium, potassium, calcium, magnesium and inorganic phosphate were measured separately in timed urine collections from a pigtail catheter and from the urethra. The data showed that Ccr and the absolute urinary excretions of sodium, potassium, calcium, magnesium and inorganic phosphate were significantly lower in the PCN kidney immediately or 2 days after relief of obstruction. The ratio of total urinary calcium excretion to urinary creatinine excretion in the obstructed kidney was significantly greater than that in the contralateral kidney. The fractional excretions of calcium and magnesium increased as renal function decreased. The results showed that when the total Ccr is below normal, the apparent excretion of urinary calcium will be underestimated. However, when the total Ccr of patients is within normal range, hypercalciuria may be detected adequately and thus favors early implementation of an appropriate therapeutic strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303749
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermodynamic analysis of stable and metastable carbides in the Mn-V-C system and predicted phase diagram (1991)
    Springer
    International journal of thermophysics 12 (1991), S. 1077-1102 
    Details
    ISSN: 1572-9567
    Keywords: carbides ; enthalpy ; entropy ; manganese compounds ; metastable phases ; phase diagrams ; vanadium compounds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermodynamic properties of the Mn-V-C system are not known from experiments, and there is a need for information on the stability of the various phases and the Mn-V-C phase diagram. This kind of information has been obtained by us. Our approach combines the methods of phenomenological modeling and extrapolation from the lower-order systems, which have been developed in the so-called CALPHAD (i.e., CALculation of PHAse Diagrams) work, with predictions of unknown thermodynamic quantities. The predictions are based on regularities in bonding properties and vibrational entropy of 3d-transition metal carbides. By using predicted Gibbs energy functions as input information in the Hillert-Staffansson “two-sublattice” phenomenological model, we take into account the substitution of Mn for V in all carbide phases. Our results are summarized in tables of thermodynamic parameters, calculated isothermal sections of the phase diagram, and the liquidus surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00503520
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  • 5
    Electronic Resource
    Electronic Resource
    Kinematics of damage zone accompanying curved crack (1991)
    Springer
    International journal of fracture 50 (1991), S. 143-152 
    Details
    ISSN: 1573-2673
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper presents a methodology of a quantitative characterization of the kinematics of evolution of a damage zone surrounding the tip of a slowly propagating crack. On the basis of the Crack Layer Theory, the evolution of the damage zone is modelled as a combination of a few elementary motions: translation, rotation, isotropic expansion and distortion. A procedure for evaluating the rates of the elementary motions on the basis of direct measurements is developed. The procedure is illustrated for curved crack layer growth in the vicinity of a hole in commercial polystyrene. The important role of the damage zone in determining the main crack trajectory and speed is clearly demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00035209
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    Paper (German National Licenses)
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