共查询到20条相似文献,搜索用时 31 毫秒
1.
A. V. Matveev 《Russian Physics Journal》2007,50(7):646-652
Within the framework of the electron density functional, a technique is developed for calculation of the adsorption energy
and variation in the electron work function for metal substrates due to metal atom adsorption. The corrections to the local
density approximation, which are associated with non-uniformity of the electron density in the subsurface region and discontinuous
ion charge distribution over the crystal lattice sites, are included into consideration. It is shown that adsorption of alkali
metal atoms results in lower electron work function, while that of transition metals (cobalt, iron, and chromium) might both
decrease and increase the electron work function. Formation of a variety of adsorption structures from metal atoms depending
on the temperature is discussed.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 7, pp. 14–19, July, 2007. 相似文献
2.
A. A. Kurskov E. A. Ershov-Pavlov L. V. Chvyaleva 《Journal of Applied Spectroscopy》1989,51(5):1135-1138
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 51, No. 5, pp. 742–746, November, 1989. 相似文献
3.
Equations are formulated for the elastic-plastic strains of crystals experiencing an inelastic flow of crystallographic shears. Local invariant relationships, including creep and active plasticity, are constructed. To take account of the microstresses a method of effective field is used. All the relationships are derived in a tensor formulation with reliance on representations about the physical regularities of the development of deformation. The derived system of equations describes a broad class of problems of the physics and mechanics of plasticity of an almost unbounded degree of complexity.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 73–78, June, 1988. 相似文献
4.
Based on a semicontinuum model, the electrostatic, the polarisation, and the repulsive energy change of a lattice is calculated numerically, as a function of the relaxation of the nearest neighbouring ions of a substitutional impurity in an alkali halide crystal. It is found that for a particular displacement, the total energy change of the lattice is a minimum. Thus the heat of formation of a dilute solid solution is obtained. Here, we report calculations on the heat of formation of the following systems-Na+ in LiCl, Li+ in NaCl, K+ in NaCl, Na+ in KCl, Rb+ in NaCl, Na+ in RbCl, F? in NaCl, Cl? in NaF. Br? in NaCl and Cl? in NaBr. 相似文献
5.
S. N. Abdullin V. L. Furer A. Yu. Bilibin O. N. Piraner 《Journal of Applied Spectroscopy》1989,50(4):423-426
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 50, No. 4, pp. 646–650, April, 1989. 相似文献
6.
B. N. Grudin S. V. Dolzhikov E. G. Kislenok V. S. Plotnikov 《Bulletin of the Russian Academy of Sciences: Physics》2007,71(10):1447-1452
Some methods for studying the structure of materials on the basis of microscopic images are considered. The images are analyzed using various orthogonal transformations: Fourier, cosine, Hartley, and continuous wavelet transformations. 相似文献
7.
8.
傅里叶望远镜外场实验性能改进和结果分析 总被引:4,自引:0,他引:4
为了实现对傅里叶望远镜成像系统更接近实际的仿真,改进了外场实验系统结构。采用反射式目标,利用准直扩束镜替代空间滤波器和准直透镜,使用大靶面电荷耦合器件作为监视器。在无大气和包含200m水平大气两种情况下,分别对2.5mm的4种不同空间频谱分布目标进行实验。实验选用9×9,17×17,33×33和65×65傅里叶分量分别进行重构。最高成像角分辨率为3.5″。结果表明含大气与无大气重构结果的Strehl比值相近,从而证明傅里叶望远镜成像系统能够克服下行链路低阶大气扰动的影响。 相似文献
9.
10.
V. I. Noskov 《Russian Physics Journal》1991,34(11):1018-1024
We consider a metric model of 4-space with the conformai Weyl parameter depending on the state of the charged matter. We show that there exists a version of the theory that allows unification of gravitation and electrodynamics based on geometry with an additional dynamical connection. We give equations for geodesies, curvature tensors, and the Ricci and scalar curvatures. Within the framework of the model, we obtain the Einstein equations as well as Maxwell-type equations that contain a nonlinearity analogous to the nonlinearity of the Einstein equations. We find an exact solution for the case of a static, homogeneous spherical charge distribution. The internal solution has a region of singular attraction and repulsion of like-charged matter.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 11, pp. 85–91, November, 1991. 相似文献
11.
D. V. Mokrova 《Bulletin of the Lebedev Physics Institute》2009,36(12):362-364
In this paper, we present the results of the study of laboratory mockups of optoelectronic sensing elements of speckle sensors
of the velocity of the capillary blood flow in the human skin, pulse wave dynamics, and skin pathologies. Furthermore, the
model of a multipurpose optical Fourier processor, which makes it possible to obtain information on objects under study simultaneously
in the spectral form and as an image, is considered. 相似文献
12.
A. A. Sobko 《Doklady Physics》2018,63(5):186-188
General considerations on the form of the real equation of state make it possible to assume that the ratio of the melting temperature to the critical temperature is constant for each group of elements. This assumption is verified for two groups of elements, the critical temperatures of which are measured. It is shown that, for certain groups of elements, the critical temperatures of which are calculated instead of being measured, this assumption is also valid. The critical temperatures of certain elements are calculated or refined. 相似文献
13.
G. B. Malykin 《Radiophysics and Quantum Electronics》1991,34(7):667-671
The effect of the accuracy of reciprocal tuning of the elements of a fiber-optic interferometer (FOI) — laser, polarizer, and eigenaxes of single-mode-fiber (SMF) birefringence — is examined. It is shown that zero drift in the FOI consists of two parts — a constant part and a temperature-related variable part. Both of these parts are functions of the polarization state of the radiation at the entrance to the polarizer, the extinction coefficient of the polarized, and the orientation of the SMF eigenaxes with respect to the polarizer. The variable part of the zero drift is also a function of the birefringence and h-parameter of the SMF and the width of the radiation-source spectrum. Numerical estimates of FOI zero drift are made.Institute of Applied Physics, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 34, No. 7, pp. 817–824, July, 1991. 相似文献
14.
15.
This paper studies the symmetry of Lagrangians of
nonholonomic systems of non-Chetaev's type. First, the definition
and the criterion of the symmetry of the system are given. Secondly,
it obtains the condition under which there exists a conserved
quantity and the form of the conserved quantity. Finally, an example
is shown to illustrate the application of the result. 相似文献
16.
V. I. Danilova T. N. Kopylova G. V. Maier L. V. Masarnovskii A. N. Soldatov V. B. Sukhanov 《Russian Physics Journal》1980,23(10):872-877
A study is made of the possibility of improving the laser properties of dyes pumped by the radiation of a copper-vapor laser, the choice of dye mixtures optimal from the point of view of producing stimulated emission, and the influence of the solvent on these properties, the aim being to obtain optimal energy parameters in an instrument based on a copper-vapor laser and an optical attachment.Translated from Izvestiya Vysshikh Uchebnhykh Zavedemii, Fizika, No. 10, pp. 44–48, October, 1980. 相似文献
17.
V. Aquilanti A. Lombardi M. B. Sevryuk 《Russian Journal of Physical Chemistry B, Focus on Physics》2008,2(6):947-963
In Aquilanti, Lombardi, and Sevryuk, J. Chem. Phys. 2004, V. 121, No. 12, P. 5579 and Sevryuk, Lombardi, and Aquilanti, Phys. Rev. A. 2005, V. 72, No. 3, P. 033201, we defined several partitions of the total kinetic energy of a system of classical particles into terms corresponding to various motion modes. In this work, we study the statistics of these terms for clusters with the number of particles N from 3 to 100 (at randomly selected particle coordinates and velocities). Some new kinetic energy components are defined and studied. Two limiting situations are considered, those of particles of equal masses and particles whose masses vary randomly. With equal masses, the mean values of almost all cluster kinetic energy components are expressed in terms of N with the use of very simple equations. 相似文献
18.
Various models for determination of the temperature dependence of thermal pressure are critically examined in the light of
experimental data. We have considered Mg2SiO4, Olivine, MgAl2O4, Pyrope rich garnet, Fe2SiO4, Grossular garnet, MnO, NaCl and KCl. The superiority of one model over others is discussed. The model is extended to study
the compression behaviour at different temperatures, and the combined effect of pressure and temperature on thermal pressure
of San Carlo Olivine. A good agreement obtained between theory and experiment demonstrates the validity of the present approach. 相似文献
19.
20.
A formula for calculating the probability of ruin of an insurance company is derived with consideration of reinsurance. Asymptotes
to this probability are examined for a company with large capital.
Anzhero-Sudzhensk Branch of Kemerovo State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No.
4, pp. 3–9, April, 2000. 相似文献