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  • 1995-1999  (6)
  • 1970-1974  (2)
  • 1999  (6)
  • 1970  (2)
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  • 1995-1999  (6)
  • 1970-1974  (2)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Enhanced flux pinning in (Nd0.33Sm0.67)Ba2Cu3O7−δ melt-processed superconductors by Ar postannealing (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 259-261 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-quality binary (Nd0.33Sm0.67)Ba2Cu3O7−δ monodomain superconductors were fabricated by the combination of a compositional-controlled melt-processing technique in air and postannealing in Ar. Critical current densities over the whole field range were observed strongly dependent on Ar postannealing while holding superconducting transition temperatures as high as 96 K. The suppressed chemical variation between the rare-earth element (RE: Nd, Sm) and Ba associated with disperse RE2BaCuOy (RE211) precipitate due to the decomposition occurring in Ar postannealing was attributed to the modified flux pinning. This makes Ar postannealing promising to process superconductors with desired properties for various applications. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124341
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bestimmung des Wirkungsquerschnitts σ(Cs+→Cs) aus Sondenmessungen in einem thermischen Cs-Plasma (1970)
    Springer
    The European physical journal 237 (1970), S. 427-431 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ion currentI i to a Langmuir probe was measured in a Cs-plasma which was produced by contact ionization and for which the neutral densityn g is known and the plasma density is given by the Saha equation. Using the theory of Self and Shih the collision cross section σ(Cs+→Cs) was calculated from the measured ion currentI i .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01407640
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Prüfung der Vollernteverträglichkeit von Kartoffelsorten (1970)
    Springer
    Potato research 13 (1970), S. 305-322 
    Details
    ISSN: 1871-4528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Zusammenfassung Es werden die Erfahrungen bei der Prüfung von Kartoffelsorten auf ihre Vollernteverträglichkeit mitgeteilt, die in den seit 1965 durchgeführten Vollernteversuchen gewonnen wurden. Da die Erntebedingungen starken Einfluß auf die Höhe der Beschädigungen nehmen können, ist im Interesse einer besseren Vergleichbarkeit der Sorten eine zu starke Differenzierung der Erntetermine nichtzweckmäßig. Einzelne Sorten zeigen eine unterschiedliche Reaktion auf die Veränderung der Rodegeschwindigkeit. Die Unterschiede sind jedoch gering, so daß die Rodung bei einer Geschwindigkeitsstufe durchgeführt werden kann. In der Vollernteverträglichkeit läßt sich eine Wechselwirkung zwischen Sorte, Standort und Jahreswitterung feststellen, wobei einzelne Sorten nur eine geringe, andere eine hohe Reaktionsnorm besitzen. Die von Jahr zu Jahr unterschiedliche Größenausbildung der einzelnen Sorte hat praktisch keinen Einfluß auf die Vollernteverträglichkeit. Mit zunehmender Reifezeit nimmt die Vollernteverträglichkeit ab. Für die Einstufung der Sorten nach ihrer Vollernteverträglichkeit sollte der Anteil der Gesamtbeschädigungen als Maßstab verwendet werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358276
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  • 4
    Electronic Resource
    Electronic Resource
    Density and total pressure behavior in the process of forced and spontaneous reconnection (1999)
    Springer
    Journal of applied mechanics and technical physics 40 (1999), S. 558-562 
    Details
    ISSN: 1573-8620
    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 specific features of the density and total pressure (the sum of magnetic and gas-kinetic pressures) behavior in the process of forced (by the example of propagation of a magnetic acoustic wave in the vicinity of the X-point) and spontaneous (by the example of development of a helical Thirring mode) reconnection are considered. It is shown that the total pressure distribution depends weakly on the initial value of the gas-kinetic pressure, the strength of the z-component of the magnetic field, and the thermal conductivity in a wide range of parameters. The character of density distribution is determined only by the thermal conductivity. It is also shown that the behavior of the total pressure and density in the case of spontaneous reconnection weakly depends on the thermal conductivity, in contrast to the forced case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02468428
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  • 5
    Electronic Resource
    Electronic Resource
    Electronic Structure and Superconductivity of Nonmagnetic Transition Metal Borocarbides (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1617-1621 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The electronic structure of tetragonal (RC(N))m(TB)2, m=1−3, compounds, with R= Y,Lu,La, T=Ni,Pt is studied. Total and partial densities of states N(E) are calculated and compared with orbital resolved x-ray absorption data. Special attention is paid to the structure of N(E) near the Fermi-level and its consequences for thermodynamic properties in the superconducting and the normal states. A medium el-ph coupling constant 0.5≤λ≤ 1.2 is found. There is no simple correlation between N(0) and T c . The analysis of the upper critical field reveals the presence of at least two groups of electrons with quite different Fermi velocities v F in accord with dHvA data, and with calculated distributions of v F around the Fermi surface
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022563716127
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  • 6
    Electronic Resource
    Electronic Resource
    Anomalous Behaviour of PrNi2B2C Borocarbide (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1599-1603 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electrical resistivity ρ(T), specific heat C p(T), magnetic susceptibility χ(T), and magnetization M(H) have been measured for polycrystalline PrNi 2 B 2 C. Maxima in C p(T) and |dχ(T)/dT| dependencies were found at T N ≈ 4.3 K connected with AFM ordering observed earlier by neutron diffraction. The Sommerfeld coefficient is at least 250 mJ/mol K 2 . The values of T N for PrNi 2 B 2 C and |dT c /dx| for Y 1−x Pr x Ni 2 B 2 C were found to be much larger than estimated by the de Gennes scaling from the Gd-based borocar-bides. These facts as well as anomalous decrease of ρ(T) found below 20K are connected with moderate heavy fermion behaviour of antiferromagnetic PrNi 2 B 2 C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022507631148
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  • 7
    Electronic Resource
    Electronic Resource
    Hall-Effect in LuNi2B2C and YNi2B2C Borocarbides in Normal and Superconducting Mixed States (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1605-1609 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It was shown that the Hall resistivity ρ xy for LuNi 2 B 2 C and YNi 2 B 2 C is negative in the normal and mixed states and has no sign reversal below T c . In the mixed state the scaling relation ρxy ∼ ρ xx β (ρxx is the longitudinal resistivity) was found for both compounds with β ≈ 2.0. In the normal state a distinct nonlinearity in the ρ xy(H) dependence, accompanied by a large magnetoresistance, was found below 40 K only for LuNi 2 B 2 C. The difference in the behaviour of Lu- and Y-based borocarbides seems to be connected with the difference in the Fermi surfaces of these compounds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022559615218
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  • 8
    Electronic Resource
    Electronic Resource
    Diluted and Concentrated Isoelectronic Substitutional Effects in Superconducting R x Y1−x Ni2B2C Compounds (1999)
    Springer
    Journal of low temperature physics 117 (1999), S. 1623-1627 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The suppression of superconductivity of pseudo-quaternary R xY1−x Ni2B2C compounds in the dilute limit was found to be mainly caused by magnetic pair-breaking in the case of the heavy rare-earth elements (R = Tm, Er, Ho, Dy, Tb, Gd) and by lattice distortions in the case of the light rare-earth elements (R = Pr, Nd) resulting from the large difference of the ionic radii between the Y host ions and the R impurity ones
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022515800197
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