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31.
U. Benedict 《高压研究》2013,33(2):139-147
Abstract The proposed diagram is based on the results of high-pressure X-ray diffraction work and visualizes the general trends in phase relations of actinide metals under pressure. The transition from dhcp to ccp, which occurs under the action of pressure in heavy actinides and light lanthanides, also occurs with decreasing atomic number at ambient pressure. The same structural sequence is found in the lanthanide and the actinide metals, but its first two members, hcp and Sm-type, are missing in the actinide metals, and the phase transitions are shifted to lower pressures and higher atomic numbers in the actinides. 相似文献
32.
Abstract The high-pressure crystal structures of the compounds UX, where X = N, P, As and Sb, have been studied using X-ray diffraction in the pressure range up to about 60 GPa Rhornbohedral distortions are observed for UN and Up above 29 GPa and lO GPa, respectively. In Up a further transformation to an orthorhombic phase occurs at 28 GPa. UAs and USb transform to the CsCl structure at 20 GPa and 9 GPa, respectively. The latter transformations show a considerable hysteresis when the pressure is released. The scaling behaviour of the bulk modulus has been studied. It is confirmed that a log-log plot of bulk modulus versus specific volume for the cubic phases gives a straight line with a slope near ? 5/3. 相似文献
33.
V. Henriques U. Klausen J. Race K. L. Zirm J. Benedict W. Zimmermann J. Robert S. W. Cole S. L. Leiboff B. S. Kahn B. Matsumoto L. Ambard F. Schmid T. Teorell S. Balachowski B. Bruns A. Fujita S. Kasahara F. Serio S. Fiandaca K. Lang O. Manasse H. Müller H. v. Pechmann G. Schmidt R. Willstätter H. Kraut O. Erbacher J. Sacks A. C. Jvy J. P. Burgess und J. E. Vandolah 《Fresenius' Journal of Analytical Chemistry》1933,93(1-2):64-80
Ohne Zusammenfassung 相似文献
34.
Ohne Zusammenfassung 相似文献
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36.
S. R. Benedict W. Denis C. L. A. Schmidt C. G. L. Wolf und E. Österberg 《Fresenius' Journal of Analytical Chemistry》1912,51(6):400-402
Ohne Zusammenfassung 相似文献
37.
Many of the striking similarities which occur for the adjoint representation of groups in the exceptional series (cf. [1–3]) also occur for certain representations of specific reductive subgroups. The tensor algebras on these representations are easier to describe (cf. [4,5,7]), and may offer clues to the original situation.The subgroups which occur form a Magic Triangle, which extends Freudenthal's Magic Square of Lie algebras. We describe these groups from the perspective of dual pairs, and their representations from the action of the dual pair on an exceptional Lie algebra. To cite this article: P. Deligne, B.H. Gross, C. R. Acad. Sci. Paris, Ser. I 335 (2002) 877–881. 相似文献
38.
S. Aukkaravittayapun P. J. King K. A. Benedict Yu. I. Latyshev I. G. Gorlova S. Zybtsev A. Campbell R. A. Doyle J. Johnson W. S. Seow 《Physica C: Superconductivity and its Applications》1996,270(3-4)
We describe three mechanisms for the anomalous voltage reversals which are occasionally observed during four contact current-voltage measurements on the high temperature superconductors. Voltage reversals have been frequently observed for whiskers of the bismuth strontium calcium copper oxide (BSSCO) compounds, and we describe measurements made on high quality whiskers of the 2:2:1:2 and 2:2:2:3 phases. A simple model based on extreme anisotropy plus offset contacts can explain the gross features of four contact measurements in the ohmic flux-flow regime, but not the wealth of reversal phenomena found for the IVVI configuration in the lower temperature irreversibility region. 相似文献
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40.
By use of sodium borohydride under the proper reaction conditions, direct conversion of both aliphatic and aromatic acid chlorides to the corresponding aldehyde can be achieved in 80–95% yield. 相似文献