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G. P. Grabovetskaya I. V. Ratochka E. V. Kabanova E. V. Naidenkin I. K. Zverev Yu. R. Kolobov R. Z. Valiev 《Russian Physics Journal》1994,37(12):1181-1184
We have investigated the effects of surface copper diffusion on the creep of large-grain nickel (average grain size about 20 m) and submicron crystalline nickel (grain size about 0.3 m). For both structural states of nickel we find an acceleration of creep over its value in vacuum, and an increase in plasticity during creep when copper has diffused deeply into the nickel from the surface. The temperature range over which these effects are observed in the submicron nickel is nearly 300° lower than that for the large-grain samples. This result is probably due to a significant increase in the grain-boundary and bulk diffusion coefficients of copper in submicron nickel when compared with large-grain nickel.Siberian Branch. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 83–86, December, 1994. 相似文献
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Valiev U. V. Malysheva M. E. Rakhimov Sh. A. Sultonov O. Z. 《Optics and Spectroscopy》2022,130(4):295-301
Optics and Spectroscopy - The magnetic susceptibility and the Faraday effect in DyAlO3 single crystal samples are studied in the temperature range of 78–300 K along the easy-magnetization... 相似文献
157.
John B. Gruber Raylon M. Yow Uygun V. Valiev Gary W. Burdick 《Journal of luminescence》2008,128(8):1271-1284
Detailed analyses of spectroscopic and temperature-dependent magnetic susceptibility data are reported for the crystal-field split energy levels of the 7FJ and 5D4 of Tb3+ in stoichiometric single crystals of ortho-aluminate TbAlO3. The spectroscopic data include absorption spectra obtained between 2940 and 480 nm from 8 to 300 K. High resolution fluorescence spectra are reported, representing transitions from 5D4 to 7F6,5,4, at a sample temperature of 85 K. Using crystal-field modeling techniques recently adapted for low symmetry systems, we have assigned all 58 experimental Stark levels within the 7FJ and 5D4 manifolds, with a fitting standard deviation of 4.5 cm−1 (3.8 cm−1 rms error). As a further test, the theoretical Stark levels and calculated wavefunctions were used to determine the temperature dependence of the magnetic susceptibility along the c-axis of the TbAlO3 crystal. Good agreement is obtained between the calculated susceptibility and temperature-dependent magnetic data reported earlier, including a prediction of a 0.2 cm−1 splitting of the ground-state quasi-doublet. The susceptibility calculation also confirms the predicted ordering of states within the 7F6 multiplet manifold. 相似文献
158.
Physical mechanism of ultrafast flame acceleration 总被引:1,自引:0,他引:1
We explain the physical mechanism of ultrafast flame acceleration in obstructed channels used in modern experiments on detonation triggering. It is demonstrated that delayed burning between the obstacles creates a powerful jetflow, driving the acceleration. This mechanism is much stronger than the classical Shelkin scenario of flame acceleration due to nonslip at the channel walls. The mechanism under study is independent of the Reynolds number, with turbulence playing only a supplementary role. The flame front accelerates exponentially; the analytical formula for the growth rate is obtained. The theory is validated by extensive direct numerical simulations and comparison to previous experiments. 相似文献