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  • 1985-1989  (7)
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  • 1
    Electronic Resource
    Electronic Resource
    Hysteretic ac losses in high-temperature superconductors (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 386-388 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theory of ac losses in the type II superconductors in the frame of the critical state model [J. Thompson, M. Maley, and J. R. Clem, J. Appl. Phys. 50, 3531, 3518 (1979)] is applied to high Tc materials (Y-Ba-Cu-O) assuming an exponential drop of the critical current density Jc with both magnetic field and temperature. The dependence of dc magnetic field (H1) at which ac loss minimum occurs on an amplitude of ac magnetic field (h0) and on temperature Tc is calculated numerically. The two maxima of the total ac losses are found: one of them is very close to Tc and second maximum below Tc shifts to lower temperatures with increasing ac or dc magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101454
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Temperature behavior of the coercivity of a magnetically hard alloy Pt0.7Ni0.3Fe (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 3980-3982 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The kinks of a Bloch wall at some lamellar junctions are attributed to the reduction of the demagnetizing energy. An improved method is developed to calculate Hc(T), the coercive field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343367
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Crystal structure and superconductivity of TlBa2CaCu2O6.5 (1988)
    Springer
    The European physical journal 73 (1988), S. 9-13 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this article, the crystal structure and superconductivity of a new superconducting phase TlBa2CaCu2O6.5 (T c =72.5 K) in Tl−Ba−Ca−Cu−O system are studied. The crystal structure of the compound TlBa2CaCu2O6.5 has been determined by means of X-ray powder diffraction method. It belongs to primary tetragonal lattice with lattice parameters:a=3.847 Å,c=12.73 Å. Its space group isD 4h 1 −P4/mmm. Each unit cell contains one formular unit. The arrangements of ions in a unit cell are following: 1 Ca, and 1 Tl cations occupy 1(a) and 1(d) equivalent point positions respectively. 2 Cu cations occupy 2(h) (z=0.127) equivalent point positions. 2 Ba cations occupy 2(g) (z=0.281) equivalent point positions. 6.5 O anions respectively occupy 1(b), 2(h) (z=0.281) and 4(i) (z=0.127) equivalent point positions. Occupation factor is 0.929. The crystal structure of TlBa2CaCu2O6.5 is quite similar to those of the other superconducting phases in Tl−Ba−Ca−Cu−O system. All cations are distributed at positions of (0, 0,z) and (1/2, 1/2,z) alternately. The oxygen deficient pseudo-perovskite unit Ba−Cu−Ca−Cu−Ba is separated two Tl−O layers in the crystal structure of Tl2Ba2CaCu2O8. However, the oxygen deficient pseudo-perovskite unit Ba−Cu−Ca−Cu−Ba is separated by single Tl−O layer in the crystal structure of TlBa2CaCu2O6.5. The relations among the crystal structures of the superconducting phases as well as the relation between the crystal structure and superconductivity are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01312148
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of γrays from cold fusion (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 667-669 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] PETRASSO ET AL. REPLY-Our criticism1 of the published 2.22-MeV neutron-capture-on-hydrogen y-ray line of Fleischmann et al.\ claimed by them as compelling evidence of neutron production in their electrochemical cells (Fig. la of erratum of ref. 2; Fig. 2 of ref. 1; our Fig. 1 here), raised two ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339667b0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Problems with the γ-ray spectrum in the Fleischmann et al. experiments (1989)
    [s.l.] : Nature Publishing Group
    Nature 339 (1989), S. 183-185 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR-Fleischmann, Pons and Hawkins1 recently announced the observation of significant heating in their cold-fusion experiments, a result that they attribute to copious fusion reactions. As compelling evidence that fusion had occurred, they reported the observation of the 2.22-MeV y-ray line that ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/339183a0
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  • 6
    Electronic Resource
    Electronic Resource
    Mass measurement and spectroscopy of57Cu with the58Ni(14N,15C)-reaction (1987)
    Springer
    The European physical journal 326 (1987), S. 139-146 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 25.70.Cd ; 27.40.+ z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mass of57Cu has been measured with the58Ni(14N,15C)-reaction at 150 MeV incident energy with theQ 3D-spectrometer. The reaction has been selected after a careful inspection of the DWBA-expression for the cross section with respect to the highest weighting factors for spins andl-transfer. Cross sections of several μb/sr have been obtained. TheQ-value has been measured to beQ 0=−19.90 (4) MeV and the57Cu mass excess is −47 340 (40) keV. Four lines of excited states have been observed up to 5.7 MeV. These states have a structure of single particle character, since57Cu consists of a doubly closed core with N=Z=28 and a proton outside, and states up to the 2d 5-shell are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283588
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  • 7
    Electronic Resource
    Electronic Resource
    Refractive scattering and the nuclear rainbow in the interaction of12, 13C with12C at 20MeV/N (1985)
    Springer
    The European physical journal 322 (1985), S. 241-261 
    Details
    ISSN: 1434-601X
    Keywords: 24.10.−i ; 25.70.Cd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The elastic and inelastic scattering and the neutron transfer have been measured for the systems12C +12C and13C +12C at 20MeV/N up to θcm= 60° with theQ3D -spectrometer. The angular distributions of the elastic scattering show an enhanced cross section at angles larger than 40°. It can be identified as refractive scattering with the clear signature of a nuclear rainbow.L-cut-off calculations show that these contributions come fromL-values which are significantly lower than the grazingL-value. The deflection function has a broad minimum in thisL-range which is typical for rainbow scattering. TheS-matrix is decomposed by a phenomenological parametrization into a refractive and a diffractive part. The interference of these amplitudes plays an important role in the rainbow enhancement. The spatial localization of the refractive scattering is deduced from the turning points of the corresponding trajectories; a localization between 2.5 fm and 4 fm is found. Semi-classical calculations with complex trajectories in the single-turning-point approximation show good agreement with the quantummechanical calculations. Refractive contributions are not observed in the inelastic scattering. This can be explained by reducing the strength of the conventional collective form factor in the internal region. In contrast to this the enhancement at large angles is seen in the one-neutron transfer channels where the refractive scattering is dominant. This is the first observation of such contributions to heavy-ion transfer reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01411889
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    Paper (German National Licenses)
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