共查询到20条相似文献,搜索用时 31 毫秒
1.
A method is proposed for improving the accuracy of measuring the wedge angle of transparent plates using a lateral-shear holographic
interferometer. Consecutive processing of a pair of interferograms with doubled number of interference fringes leads to reduction
of the observational error by a factor of two compared to traditional interferometric methods. Data on the experimental validation
of the method are presented. 相似文献
2.
The distributions of zeros of the partition function of lattice gas models of Fisher (at some temperature) and of Temperley are obtained. The former is a closed loop crossing the real axis and the latter is a part of the negative real axis. 相似文献
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E. T. Shavgulidze 《Russian Journal of Mathematical Physics》2009,16(1):130-132
The amenability of several discrete subgroups of the group of diffeomorphisms of the circle is proved. 相似文献
6.
We consider two classes of probability distributions for configurations of the ideal gas. They depend only on kinetic energy and they remain of the same form when degrees of freedom are integrated out. The relation with equilibrium distributions of Tsallis’ thermostatistics is discussed. 相似文献
7.
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
8.
Russian Physics Journal - A mathematical model of the flow of aggregated load characteristics of network traffic data packets in the form of a set of analytical signals is proposed. The real parts... 相似文献
9.
A. Yu. Gufan O. V. Kukin Yu. M. Gufan 《Bulletin of the Russian Academy of Sciences: Physics》2011,75(5):661-665
It is widely known that the interaction of triplets of particles (which are not reducible to the sum of pair interactions)
play an important role in formation the nonlinear and anisotropic properties of crystals. The aim of this work is to establish
a general form of the dependence of these properties on interactions of triplets of atoms that is dependent only on the structure
of the crystals. To separate the interactions of triplets of atoms from those of quadruples, we assume that the energy of
triplets of interacting atoms depends only on the characteristics of a triangle whose vertices are the centers of gravity
of interacting atoms. In this model, the internal energy must therefore be invariant upon rearrangement of the numbers of
interacting atoms and any rotation of the triangle in isotropic space, P(3) × O(3). To specify the form of energy dependence on characteristics of selected triangles, we constructed an integral rational
basis of invariants in dependence on the components of the vectors connecting the vertices of each triangle. Using the example
of a simple dependence of the energy on basic invariants, we show how to move from the assumed energy dependence on invariants
to the dependence of energy on lattice sums. 相似文献
10.
Optics and Spectroscopy - Recent experimental results on formation of ordered surface nanostructures of hexagonal symmetry on metals under the action of a series of scanned doubled collinear... 相似文献
11.
《Solid State Communications》1986,57(7):519-522
Electrolysis of interlayer water of crystallisation has been established by a direct d.c. electrolysis experiment on molybdic acid. The dihydrate MoO3middot; 2H2O gets converted into its monohydrate. This is confirmed by IR and Laser Raman Spectra. The increase in a.c. electrical conductivity with increasing d.c. bias, a.c. signal level and ambient humidity also supports the above viewpoint. 相似文献
12.
N. K. Choudhury 《Zeitschrift für Physik A Hadrons and Nuclei》1958,151(2):93-105
The polarization ratio (I b/Ia) of fluorescence of a monocrystalline film of pure anthracene is measured correcting for all probable errors. Comparison with decay-time data brings out that deviation from the value obtained from absorption measurements is due to a loss of intensity in the a-polarized fluorescence as compared to what is expected from absorption data. This is interpreted as an evidence that anthracene crystal fluorescence is emitted from regions of local lattice imperfections. It is confirmed that the first electronic transition takes place along the short axis of the anthracene molecule. 相似文献
13.
A. H. Martirosyan 《Journal of Contemporary Physics (Armenian Academy of Sciences)》2009,44(6):296-299
A new method for determining the density of polymer materials based on determination of the path-length differences in moiré
patterns is proposed. The method is characterized by simplicity and accuracy of results. The densities of polychloropren and
polystirol have been determined with high accuracy. Knowledge of the dependence of the polymer density on the stretching degree
enables one to reveal the dynamics of changes in the permolecular structure at deformation of polymers. 相似文献
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Russian Physics Journal - Realization of a criterion of dimensional quantization in quantum wells of various profiles is considered. It is established that there is the limit number of the discrete... 相似文献
16.
New methods of interpretation of meteor observations were developed and published in [1?C9]. The interpretation of ground-based observations of meteors and bolides available today in the scientific literature all over the world suffers from serious contradictions. Observers use the so-called photometric approach for determination of extra-atmospheric masses of meteoric bodies. This approach is based on the formula proposed in 1933 [10] and very simple ideas of how to describe the interaction between the atmospheric air and the surface of a meteoric body. These ideas are provisionally suitable to describe the flow around a body in a free molecular regime. Subsequently, the photometric approach was applied to all the meteor events including bolides. The main effort aimed to elaborate the approach included a choice of new formulas for the radiative efficiency. 相似文献
17.
The features of the macroscopic inhomogeneity of plastic deformation in the form of autowaves with a pulsating amplitude are analyzed, and data on the localization of sources of acoustic emission at different stages of plastic flow in the stretching of fcc mono- and polycrystals are presented. The relationship between the local components of the plastic distortion tensor in the strain localization zone is traced. The role of acoustic phenomena accompanying the localization of plastic strain in the development of the process of plastic deformation is considered. 相似文献
18.
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
19.
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