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121.
The electrical conductivity, magnetization, and magnetoresistance of manganites La1 − x
Ag
x
MnO3 have been investigated in the temperature range 78–300 K. The samples have been synthesized by the sol-gel method. At room
temperature, the magnetic field of 0.6 T has no effect on the electrical conductivity. As the temperature decreases, an abrupt
jump is observed in the magnetization curve due to the semiconductor-metal phase transition. This transition hardly affects
the temperature dependence of the resistance. 相似文献
122.
123.
124.
125.
In the Shubnikov–de Haas oscillation spectrum of doped InAs/AlSb structures, high-amplitude peaks are established at combination
frequencies. It is demonstrated that they are caused by a significant contribution of intersubband scattering to the processes
of electron-electron interaction.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 32–38, December, 2008. 相似文献
126.
127.
Yu. N. Sazanov L. A. Shibaev N. G. Stepanov T. M. Bulina E. F. Kolpikova A. S. Fialkov A. A. Boiko 《Journal of Thermal Analysis and Calorimetry》1989,35(5):1365-1371
Mass-spectrometric thermal analysis of samples of furan polymers obtained by heating furyl alcohol in a closed volume at 200 °C, 250 °C and 300 °C permitted determination of the qualitative composition of the gas products evolved from the polymers upon non-isothermal temperature increase from 20 to 1200 °C. The degree of unsaturation of the samples was evaluated quantitatively. The main features of the formation, degradation, structurization and carbonization of furan polymers were considered. 相似文献
128.
M. D. Missarov R. G. Stepanov 《Proceedings of the Steklov Institute of Mathematics》2009,265(1):154-164
We reduce the calculation of the vertex parts of p-adic Feynman amplitudes to a recursive procedure for evaluating singular parts of certain integrals. We propose an algorithm for calculating these integrals in the general form. As an example, we consider vertex parts of amplitudes in the ? 4 theory. 相似文献
129.
A.I. Khromov A.A. BukhankoS.L. Stepanov E.P. Kocherov 《Journal of Computational and Applied Mathematics》2008
An approach to the investigation of shape discontinuity regions as strain concentrators is proposed. The near-concentrator strain fields are determined on the basis of the theory of ideal rigid-plastic body; under the condition of plane deformation, their determination is reduced to integration of ordinary differential equations. The deformation as a function of the location of the plastic region and its shape evolution in the process of plastic flow is studied. The plastic flow is demonstrated to be not unique (within the framework of solution completeness). A deformation criterion for the choice of the preferred plastic flow is suggested. The fracture of a V-notched strip is considered. On the basis of the solutions obtained, an approach to the investigation of the fracture processes for more complicated models is formulated. 相似文献
130.