共查询到20条相似文献,搜索用时 62 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.
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
3.
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
4.
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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The specific features revealed in the superlinearity of dose dependences of thermoluminescence of anion-defective aluminum oxide single crystals have been considered theoretically in terms of the model of an interactive trap system. The model explains the decrease in the degree of superlinearity at a low heating rate, as well as with an increase in the dose increment, the occupancy of deep traps, and the sensitivity of the crystals to radiation due to the increase in the concentration of luminescence centers. The obtained results indicate a widening of the possibilities of the model for interpreting experimental data in the investigation of the dose characteristics of thermoluminescence of the studied crystals. 相似文献
8.
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
9.
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
10.
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
11.
V. K. Karpasyuk G. N. Orlov G. P. Popov A. A. Shchepetkin 《Russian Physics Journal》1978,21(6):789-793
A study is made of the dependence of the coefficient of rectangularity of the hysteresis loop of ferrites of the Li-Mn-Mg and Mg-Mn-Zn system on the volume concentration of residual reverse domains. The latter is calculated from the results of measurements of the relative remanence on the basis of a model developed. It is shown that a high degree of loop rectangularity can be attained not only in the absence of reverse domains but also in the presence of a considerable volume concentration of such domains.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 6, pp. 109–114, June, 1978. 相似文献
12.
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
13.
The spectral scattering characteristics of nanoscale particles exhibited in the field of evanescent waves are analyzed using the method of discrete sources. The effect of various parameters on the behavior of the scattering characteristics is studied. The material of the particles is shown to have the most substantial effect on the scattering cross section. 相似文献
14.
Shi-Biao Zheng Guang-Can Guo 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》1998,1(1):105-107
We propose a method for preparing superpositions of coherent states of the motion of an ion in an anisotropic two-dimensional
trap, in which the ion is tightly bound in the y direction. In the scheme the ion is excited by two resonant laser beams with equal amplitude, propagating along the x and y directions, respectively. In the Dicke-Lamb limit, an initial coherent state of the ion motion can be converted into a superposition
of several coherent states on a circle through the laser-ion interactions and state-selective measurements on the ion.
Received: 30 May 1997 / Revised: 29 July 1997 / Accepted: 22 October 1997 相似文献
15.
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
16.
Knöner G Parkin S Nieminen TA Heckenberg NR Rubinsztein-Dunlop H 《Physical review letters》2006,97(15):157402
The refractive index of single microparticles is derived from precise measurement and rigorous modeling of the stiffness of a laser trap. We demonstrate the method for particles of four different materials with diameters from 1.6 to 5.2 microm and achieve an accuracy of better than 1%. The method greatly contributes as a new characterization technique because it works best under conditions (small particle size, polydispersion) where other methods, such as absorption spectroscopy, start to fail. Particles need not be transferred to a particular fluid, which prevents particle degradation or alteration common in index matching techniques. Our results also show that advanced modeling of laser traps accurately reproduces experimental reality. 相似文献
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在采用体积相加原理计算混合物物态方程的基础上,建立了一种物理模型确定混合物温度。根据混合物中各组分温度和压强平衡条件,采用压强-密度迭代方法计算给出混合物物态方程,编制了两种组分的混合物物态方程计算程序。为检验建立的温度模型的合理性及程序的有效性,分析了不同密度、温度状态的氢(H2)和钨(W)组成的混合物状态参量,计算了以下情形及其组合情形的混合物物态方程:H2和W以不同质量比混合;质量比固定,单组分状态不同;温度区间和密度区间不同。研究表明:实际应用中在建立的混合物温度模型基础上确定的混合物物态方程是合理的。 相似文献
19.
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
20.
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