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  • 1
    Electronic Resource
    Electronic Resource
    Digital subtraction angiography in potential live-kidney donors: A study of 1000 cases (1994)
    Springer
    Abdominal imaging 19 (1994), S. 461-465 
    Details
    ISSN: 1432-0509
    Keywords: Kidney donors ; Digital subtraction angiography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Intravenous digital subtraction angiography (IV-DSA) combined with excretory urography (IVU) were utilized to study the renal anatomy of 1000 potential live-kidney donors. In the entire series, 712 donors (71.2%) had bilateral single renal arteries, whereas 255 (25.5%) had unilateral multiple, 26 (2.6%) had bilateral multiple, and 7 (0.7%) had unilateral hypoplastic or absent renal arteries determined by IV-DSA. Major renal abnormalities that might be potentially significant for safe renal donation were detected in 76 donors (7.6%) by combined IV-DSA and IVU studies. In 10% of the potential donors, intraarterial digital subtraction angiography (IA-DSA) was required because of the equivocal results of IV-DSA. Of the 1000 potential donors, 700 underwent nephrectomy and the number of renal arteries at nephrectomy was compared with both IV-DSA and IA-DSA reports. Analysis of data revealed a sensitivity of 96% vs 95%, a specificity of 57% vs 75% and an overall accuracy 93% vs 90% for IV-DSA and IA-DSA, respectively. both IV-DSA and IA-DSA were accurate enough in identification of single renal arteries. However, the accuracy of IA-DSA was better than that of IV-DSA in visualization of double (84% vs 64%) and triple (66% vs 33%) renal arteries. It is concluded that IV-DSA combined with IVU is an effective technique for the evaluation of potential kidney donors. In cases where IV-DSA is equivocal, we recommend confirming IA-DSA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206941
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  • 2
    Electronic Resource
    Electronic Resource
    Optical properties of ternary ZnS x Se1−x polycrystalline thin films (1985)
    Springer
    Applied physics 36 (1985), S. 51-53 
    Details
    ISSN: 1432-0630
    Keywords: 78.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Ternary ZnSxSe1−x polycrystalline thin films were prepared by evaporation in vacuum of 10−5 Torr. The molecular fractionx varied in the region o≦x≦1. The optical constants (the refractive indexn, the absorption indexk, and the absorption coefficientα) were determined in the wavelength range 300–1600nm. A plot representingα 2=f(hv) shows that the ZnSxSe1−x polycrystalline thin films of different compositions have two direct transitions corresponding to the energy gapsE andE+Δ. The variation in eitherE orE+Δ withx indicates that this system belongs to the amalgamation type. Such variation follows a quadratic equation. The bowing parameter was found to be 0.456 eV, roughly equal to the calculated value 0.60 eV using the empirical pseudopotential method based on the virtual-crystal approximation, in which the disorder effect has not been taken into account.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00616461
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  • 3
    Electronic Resource
    Electronic Resource
    A.c. photoconductivity and optical properties of bulk polycrystalline and amorphous In x Se1−x thin films (1990)
    Springer
    Journal of materials science 1 (1990), S. 115-117 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The a.c. photoconductivity of bulk polycrystalline In x Se1−x and the optical properties of amorphous In x Se1−x thin films were investigated. The effect of heat treatment on the absorption coefficient of InSe thin films was also studied. The spectral response of the photoconductivity of polycrystalline In x Se1−x related to the near-edge absorption spectrum, shows a well-defined maximum corresponding to the width of the forbidden gap. Polycrystalline In x Se1−x realizes the behaviour of photoconductors which are sensitive in a spectral range between 400 and 1700 nm. Optical absorption of amorphous In x Se1−x thin films was recorded as a function of photon energy and the data were used to deduce the value of optical energy gap of the films. It was found that the optical energy gap decreased with increasing indium content in both bulk polycrystalline and amorphous thin films. The effect of heat treatment on the optical gap of the film has been interpreted in terms of the density of states model of Mott and Davis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694919
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchung von Halbleiter-Sperrschichtzählern bis 4,2 °K (1965)
    Springer
    The European physical journal 188 (1965), S. 378-384 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The behaviour of Semiconductor Surface Barrier Detectors has been studied in the temperature range from 300 °K to 4.2 °K. Measurements of the resolution forα- andβ-particles are given. The mean energyɛ required for producing an electron-hole-pair in Si is found to be 3.54±0.10 eV at 279 °K, and 3.72±0,11 eV at 78 °K and 4.2 °K respectively. Measured rise time of detector impulses is compared with theoretical values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326953
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  • 5
    Electronic Resource
    Electronic Resource
    Study of stress-strain characteristics of SBR and blended NR/SBR rubber (1995)
    Springer
    Czechoslovak journal of physics 45 (1995), S. 275-282 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of temperature and carbon black (CB) on the mechanical characteristics of styrene-butadine rubber (SBR) and natural rubber (NR) was studied at various temperatures. The relation obtained between true stress and true strain for both types of rubber showed three regions at room temperature and two regions at high temperature. The optimum CB concentration was found to be 95 phr for the unblended samples as it increases the stiffness of the SBR rubber materials at a maximum value. It was also found that the addition of NR to SBR increases the elasticity in the plastic region. The activation energy at the fracture of SBR samples decreased from about 2.7×10−20 to 1.8×10−20 J while for the blended samples NR/SBR it increased from 8×10−20 to 10.1×10−20 J with increasing CB concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01700268
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  • 6
    Electronic Resource
    Electronic Resource
    Transient and steady state creep of Al-4.5 wt.% Mg during phase transformation (1991)
    Springer
    Czechoslovak journal of physics 41 (1991), S. 967-974 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Transient and steady state creep of Al-4.5 wt. % Mg alloy was studied under various constant stresses ranging from 91 MPa to 117 MPa in the temperature range from 473 K to 553 K. The results of creep characteristics have shown two main deformation temperature regions (below 493 K and above 513 K as well as a transient region between these temperatures). Peak values of transient creep parametersB andn were obtained at 493 K. The transient creep parameterB was related to the steady state creep rate εst through the exponentγ which was found to range from 0.85 to 0.5. The stress exponentm′ of the steady state creep has been found to be minimum at the steady state strain peaks, which is characteristic of dislocation climb along the grain boundaries. Microstructural analysis confirmed that the above mentioned mechanism took place in the dissolution region ofβ-phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598970
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of phase transformation on the work hardening characteristics of Al-4.5 wt.% Mg alloy (1991)
    Springer
    Czechoslovak journal of physics 41 (1991), S. 945-949 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Stress-strain curves of slowly cooled and/or quenched Al-4.5 wt.% Mg alloy samples were studied in the temperature range from 473 K to 553 K. Two main temperature regions of relaxation have been found, a low temperature region (below 493 K) and a high temperature region (above 513 K); a transient region lies between these temperatures. The parabolic work hardening coefficient, the fracture time, the yield stress and the fracture stress of annealed and quenched samples have been found to decrease with increasing deformation temperature and to exhibit minimum values at 493 K. The X-ray analysis of the slowly cooled and quenched samples has shown that the lattice parameter a of the aluminium matrix reaches a minimum value at 493 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598967
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of Sn segregation at grain boundary on the steady-state creep of Cu-10 wt % Sn alloy (1991)
    Springer
    Czechoslovak journal of physics 41 (1991), S. 149-156 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of Sn solutes segregating into grain boundaries on the steady-state creep characteristics was studied for wires of a Cu-10 wt % Sn alloy having various grain diameters,d. The creep tests were performed for samples in theα-phase in the temperature range: (0·5–0·58 Tm). The steady state creep rate,ε s, was found to vary linearly withd. The variation in the stress sensitivity parameter,m, was found to be much less appreciable for large grains (〉50μm). Activation energy calculation showed that two competitive mechanisms are operating for creep deformation, namely, dislocation climb and viscous motion of matrix dislocations due to dragging of Sn atmosphere. A value of 6·74 kJ/mol was obtained for the binding energy between a Sn atom and the dislocation, while the binding energy between a vacancy and the Sn atom was found to be 33·71 kJ/mol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598134
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  • 9
    Electronic Resource
    Electronic Resource
    Measurement of thermophysical properties of ammonium salts in the solid and molten states (1996)
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 1697-1703 
    Details
    ISSN: 1572-8943
    Keywords: ammonium salts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermal conductivity, specific heat capacity and thermal diffusivity of solid and molten ammonium thiocyanate, ammonium formate, ammonium acetate and ammonium nitrate were measured in the temperature range 80–190
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01980775
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of the laser axial modes on the coherence length of the laser beam (1989)
    Springer
    Czechoslovak journal of physics 39 (1989), S. 702-709 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The effect of the presence of the axial modes within the spectral halfwidth of a laser spectral line on the visibility of its interference fringes is represented. It is found in case of axial modes with equal spectral halfwidths that the dominant factor in determining the coherence length of the laser beam is the spectral halfwidth of its axial mode and not the spectral halfwidth of the laser line. For the case of a laser beam with axial modes of different spectral halfwidths, the calculation shows a coherence length, closer to the mode with the smaller halfwidth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598447
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