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  • 1985-1989  (3)
  • 1988  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Study on the preparation of 90-K superconductor LaBa2Cu3Oy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4095-4102 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high-Tc superconductor LaBa2Cu3Oy has been prepared under various conditions, and characterized by x-ray and neutron powder diffraction techniques, dc and ac magnetic susceptibility measurements, and dc resistivity measurement. It has been found that samples with excellent superconducting characteristics and also with good structural properties are obtained in a reproducible way if the following three procedures are performed: preheat treatment of La2O3 powders, sintering in N2, and low-temperature annealing in dried O2. Long-time annealing in undried O2 was sometimes found to degrade the grain boundaries and to lead to a lower zero-resistance temperature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341318
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High transition temperature superconductor LaBa2Cu3O7−y with zero resistance at 92 K (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 1989-1991 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Samples of LaBa2 Cu3 O7−y have been synthesized, which show a superconducting transition above 90 K. One of the samples shows a superconducting transition with an onset at 93 K and a zero resistivity at 92 K. These temperatures are the highest among those reported so far on this system and even higher than those in YBa2 Cu3 O7−y. The magnetic susceptibility measurement also shows that it has a superconducting transition with onset at around 93 K. To synthesize such good LaBa2 Cu3 O7−y requires two important procedures. First is sintering above 950 °C in N2 gas atmosphere and the second is annealing at 300 °C in dried O2 gas atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.99744
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Geographical difference in mated status and autumn migration in the rice leaf roller moth, Cnaphalocrocis medinalis (1988)
    Springer
    Entomologia experimentalis et applicata 46 (1988), S. 141-148 
    Details
    ISSN: 1570-7458
    Keywords: rice leaf roller ; Cnaphalocrocis medinalis ; insect migration ; mating ; ovarian development ; light trap
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Résumé Une différence géographique dans l'activité reproductrice des papillons de la population de C. medinalis a été observée dans les champs de paddy d'automne du Kyushu septentrional au Japon. Cette différence géographique dans la fréquence des accouplements de la population ressemble à celle de l'importance de la densité d'immigration au début de l'été: la proportion de femelles inséminées est élevée dans les populations de la côte occidentale de Kyushu et basse dans la région intérieure. Les captures de papillons aux pièges lumineux, en 1985, suggèrent l'existence au Kyushu septentrional d'invasions d'outre-mer venant de Chine. Ces immigrations potentielles automnales de papillons dans les champs de paddy à maturité expliqueraient correctement les variations au cours de la même saison de l'activité reproductrice des papillons suivant les localités. Ces migrations ne sont apparemment pas adaptatives puisque les immigrants ou leur progéniture seront immédiatement tués à la récolte ou par le froid hivernal.
    Notes: Abstract A geographical difference in reproductive status of moths in populations of C. medinalis Guénée was recognized in autumn paddy fields of north Kyushu, south-west Japan. This geographical variation in mating frequency of the population resembled the intensity of immigrant density in early summer: the proportion of mated females in the population was high in the west coast regions of Kyushu and low in inland areas. Light trap catches of moths in 1985 suggested overseas invasions from China in the autumn to westerly regions of north Kyushu. The potential autumn immigrations of moths in ripening paddy fields would satisfactorily explain the variations in reproductive status of moths with locality in the same season. These migrations are apparently non-adaptive because immigrants or their progeny would soon be killed at harvest or from cold weather.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190844
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    Paper (German National Licenses)
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