共查询到20条相似文献,搜索用时 46 毫秒
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The difference of free energies for the h.c.p. and f.c.c. parahydrogen is calculated as a function of molar volume. It is shown that the observed transition in solid parahydrogen1 can be explained by differences in the structure of the cubic and quartic anharmonic terms. 相似文献
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A computer code previously set up to simulate ion penetration in amorphous solids has been extended to handle with recoil phenomena. Preliminary results are compared with existing experimental data. 相似文献
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The triple-pomeron picture of diffraction dissociation into high masses, combined with recent observations about the dominance of short-range correlations in multiparticle production at very high energies, implies that the cross section for diffractive dissociation into high masses rises approximately logarithmically in the NAL-ISR energy range. Predictions are also made about the multiplicity distribution of diffractively-produced particles. 相似文献
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Dr. h.c. Rolf Hosemann, the “father of the ideal paracrystal,” passed away in Berlin on September 28, 1994, in his 83rd year. Rolf Hosemann was born in 1912 at Rostock on the Baltic Sea. He studied physics at Marburg and Freiburg, in Germany. In 1939 he obtained qualifications as a university teacher upon a “Habilitationsschrift” about the small-angle x-ray scattering of cellulose. In 1950 he laid the foundation to his theory of ideal paracrystals making wide use of convolution integrals as introduced into x-ray crystallography by P. P. Ewald. M. V. Laue was so much impressed by Hosemann's papers that he asked him to join the Fritz-Haber-Institut at Berlin-Dahlem as a staff member. It was there that Hosemann compiled his extensive work of more than 370 papers. Hosemann taught a large number of students. More than ten among them became university professors. 相似文献
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A phenomenological model is proposed to account for the variation of carbon diffusivityD(N1) with composition in austenite. This model is based on Parris-McLellan's statement that the increase ofD(N1) with carbon concentrationN
1 is due to the increase in chemical driving force. The gradient of the carbon activity in Wagner's and in Zupp-Stevenson's interpretation is presumed to be the intrinsic driving force. The predictions of the model are compared with carbonD(N1) values both with [1] and without [5] a chemical concentration gradient. TheD(0) values and the carbon-carbon interaction coefficients
1 are calculated by the use of the least squares method from the experimental data. The application of Zupp-Stevenson's definition of the activity coefficient
1 results in a better fit of the theory to the experimental data. 相似文献
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O. G. Mishnev 《Russian Physics Journal》1981,24(11):1015-1017
Based on an algebraic formulation of quantum mechanics we introduce concepts playing a fundamental role in the constructionof the statistical mechanics of systems having direct classical analogs. We give the definition of a macrostate, mixing in the quantum version, and also demonstrate the existence of an upper bound to the relaxation time for an isolated system. It is shown that the theory constructed here contains both quantum and classical mechanics as limiting cases, but these two cases are not reducible to each other. The existence of a transition range not describable by the Schrodinger equation is noted.Translated from Izvestiya Vysshykh Uchebnykh Zavedenii, Fizika, No. 11, pp. 42–45, November, 1981. 相似文献