Effect of the dependence of the specular reflectance on the angle of incidence of electrons on the impedance

We obtain the solution to the problem of the skin effect in a metal with specular-diffusion boundary conditions for arbitrary values of the anomaly parameter in the form of the Neumann series. For this purpose, we develop a method based on the idea of representation of not only the boundary condition imposed on the field (as is conventionally done), but also the boundary condition imposed on the distribution function, in the form of a source. The specular reflectance is an arbitrary function of the angle of incidence of electrons on the metal surface.     

On the effect of spontaneous polarization on the height of the Schottky barrier at the metal-ferroelectric contact

A comparison of the available concepts on the effect of spontaneous polarization on the height of the Schottky barrier at the metal-ferroelectric contact with the corresponding experimental data has been used as a basis for setting up an alternative model of this phenomenon, which draws on the dependence of the electron work function of a ferroelectric on the magnitude and orientation of the spontaneous polarization vector.     

建立力学模型,研究单杠运动中旋转的有关问题

建立相关的力学模型,讨论运动员在单杠旋转运动中如何增加旋转能量,杠的刚柔性对旋转运动的影响和伸展、收缩的最佳时机选择等若干问题．充分展示了力学模型对研究问题的重要意义和作用．     

Analysis of the low—lying spectrum of the He—tetramer

There is a type of nodal surface imposed by symmetry on wavefunctions.These surfaces are crucial to the ordering of low-lying states.Based on an analysis of this type of surface and based on existing theoretical results,the feature of the low-lying spectrum of the He-tetramer is studied,and the candidates of bound states and narrow resonances are suggested.     

Physical ambiguity of the notion of the solubility limit by the example of its determination using the formation of graphene on the surface in the Re-C system

Results obtained during the determination of the solubility limit of carbon in metal based on the detection of the time instant of the nucleation of the new phase, graphene, have been considered. Graphene is easily detected by the surface-sensitive methods of thermionic emission and electron Auger spectroscopy. It has been shown that the nucleation of the first graphene islands and the formation of the graphene monolayer covering the whole surface and even the multilayer graphite film on it can be used as the time instant of the phase transition depending on the sensitivity of the method. The solubility limits differ by many times depending on the determination method. This indicates the physical ambiguity of this physical characteristic of the double systems analogous in physical meaning to the pressure of the saturated vapor for the phase transitions in the one-component systems.     

Influence of the state of the bulk of the sample on the formation and thermal stability of the surface silicide on W(100)

The formation and destruction of the surface silicide on W(100) after cleaning of the sample surface and bulk in various regimes is studied by high-resolution Auger electron spectroscopy. It is shown that the cleanness of the bulk has practically no influence on the laws governing the formation of the surface silicide when Si atoms are adsorbed on a heated W surface and that almost up to completion of its formation all the silicon atoms impinging on the surface, from the very first, remain on it and are incorporated into the surface silicide. The destruction of the surface silicide depends in a definite manner on the state of the bulk, and at T=1400 K it is apparently limited in the early stages by the passage of Si atoms from the surface to the subsurface layer and in subsequent stages by the diffusion of silicon within the substrate. The bulk silicon density that limits the destruction of the surface silicide is estimated. Zh. Tekh. Fiz. 67, 137–140 (July 1997)     

Singularity index of the electromagnetic field on the edge in the presence of the Veselago medium

The singularity index of the electromagnetic field on the edge of wedge structures of two types (with and without ideally conducting sides) is investigated in the presence of a sector of a medium with negative permittivity and permeability (the Veselago medium). Restrictions on the material and geometrical parameters at which the condition on the edge is violated are determined. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 56–58, August, 2006.     

克尔效应对高斯光束聚焦特性的影响

利用菲涅尔—基尔霍夫衍射积分公式,研究薄片近似情况下的Kerr效应带来的波前畸变对高斯光束聚焦特性的影响.在相位延迟为－2~2 rad的范围内进行的模拟计算表明：正Kerr效应能提高高斯光束的聚焦强度、增大相对焦移量、提高聚焦光束的焦平面桶中功率和降低几何焦平面的峰值光强;而负Kerr效应,则会降低聚焦强度、增大相对焦移量、降低聚焦光束的焦平面桶中功率和几何焦平面的峰值光强.可以通过增大光束菲涅尔数来抑制Kerr效应对聚焦特性的影响.     

The effect of the spontaneously generated coherence on the dynamical behaviors of the dispersion and the absorption

This paper investigates the effects of the spontaneously generated coherence (SGC) and incoherent pumping field on the dynamical behaviors of the dispersion and the absorption. Using a three-level Λ-type atomic medium, the influence of the relative phase between the applied fields on the transient dispersion and absorption is discussed. It is shown that the phase dependence of the dispersion and the absorption not only depend on the existence of SGC, but they depend on the existence of the incoherent pumping field as well. We show that the medium can be used as an optical switch in which the propagation of the laser pulse can be controlled by another laser field.     

Transformations of the turbulent viscosity distribution under the effect of the internal waves in the system of stratified currents

Turbulent viscosity distributions in stratified currents are investigated. Relationship between the internal-wave-induced transformations of the temperature and turbulent exchange coefficient distributions is established. Dependences of turbulent viscosity on the phase velocity of the internal wave, water level variation, and velocity and thickness of the drift current are revealed. The contribution from the internal wave effect to the turbulent exchange coefficient value is shown to be 30% on average. Dependence of the turbulent exchange coefficient on the wave and current parameters is obtained.     

On the various derivations of the energy dependence of the empirical optical potential

The predictions of the energy dependence of the real part of the empirical optical potential implied by the formulations based on nuclear reaction theories and on the multiple scattering approach are compared. The recent data on the nucleon-nucleon forward scattering amplitude obtained from phase-shift analyses, direct measurements and dispersion relations are used. The meaning of the local expression obtained in the multiple scattering formalism is discussed and it is shown that its implications agree with those derived by the nuclear-theories approach.     

Effect of the integrated time of the induced current signal on the position resolution of the RPC detector

A prototype RPC with position resolution less than 1 mm has been produced and studied. Based on this RPC detector, the effect of the width of the integrated FADC time window on the position resolution of a RPC has been studied experimentally and theoretically. The results of theoretical calculation and experimental measurement have shown good agreement.     

Modeling the dependence of the signal/noise ratio on the detuning of the parameters of the communication system using deterministic chaos

Influence of the difference between the transmitter and receiver parameters on the quality of communication using chaotic carrier is numerically investigated. The deterministic chaos generator based on a nonlinear element with the transfer characteristic in the form of a composition of quadratic functions is proposed.     

Influence of the light intensity on the operation of the self-oscillation photoacoustic setup

In the traditional approach to photoacoustic measurements, the light source modulation frequency is fixed, or a resonance tracking mechanism is applied, that adjusts the modulation frequency to the instantaneous value of the resonance frequency of the cell, especially in the case of high Q-factor cells. However, photoacoustic measurements can also be based on a novel method in which the light intensity is modulated by the photoacoustic signal induced in the cell, hence forming a photoacoustic oscillator. Frequency of such an oscillator and shape of the resulting photoacoustic signal depend mainly on the resonance properties of the cell, but also on the power of the light irradiating the investigated sample. This paper describes the influence of the intensity of light used for exciting the photoacoustic signal on the operation of such a photoacoustic generator.     

On the unification of the law of motion

Following a heuristic modification of the principle of inertia and the principle of equivalence, a higher-dimensional metric theory is constructed on the manifold of the SO(3, 2) De Sitter group which allows us to treat structureless and spinning particles on the same footing. A dimensional analysis of the physical magnitudes is performed.     

On the theory of the spectral dependence of the quantum efficiency of homopolar crystals

A theory of the spectral dependence of the quantum efficiency of homopolar crystals in the region of small energies is elaborated on the basis of the Tewordt-Franz theory of electron impact ionization in insulators. The general conclusions were illustrated on silicon and germanium, while it was shown that known measurements can be satisfactorily interpreted by this theory.     

竖直隔板对COIL超扩段流场影响实验研究

 通过一系列对比实验比较了隔板对气流转捩点、总压损失、光腔静压的影响，并通过分析阐述了竖直隔板对扩压器内部气流参数产生影响的原因。隔板可以增加超音速区域的长度，并能增加光腔压力分布的稳定性，减小总压损失，增加压力恢复系数；隔板厚度对光腔静压的影响较大，需严格控制隔板厚度以避免正激波的产生。     

Influence of the Porosity of the Surface of a Graphite Furnace on the Atomization of a Sample

The influence of the wear of a tube graphite furnace and the morphological features of its surface on the formation of an atomic-absorption signal has been investigated. Electron-microscopic and mass-spectrometric investigations have shown that, prior to atomization, copper in the form of elementary metal microparticles is found not only on the surface of the furnace but also in the bulk of its pores. Free atoms are formed as a result of the concurrent processes of atomization of a sample on the surface of the furnace and in the bulk of its pores. The change in the apparent energy of formation of free atoms of metals interacting actively with graphite in the process of atomization and the inflection on their Arrhenius plot have been explained qualitatively.     

On the calculation of the Debye-Waller factor of alloys

Relations are derived and discussed for the temperature dependence of the diffraction of X-rays on alloys. It is shown that in a certain approximation one can separate the influence of the inter-atomic force constants from that of the masses of the alloy atoms. A reciprocal matrix is found for the linear chain and the equation for the diffraction of X-rays on an alloy is transformed in a certain approximation to an equation for diffraction on a perfect chain.     

SEM study of the influence of microstructure wettability on the character of the oil saturation of the porous space of rocks

The influence of microstructure wettability on the oil distribution in pores is studied for oil-saturated deposits with highly viscous oil. The character of the oil distribution in the pores, depending on the degree of their hydrophobicity, is shown for carbonate rocks with different oil saturation. The given data indicate the relation between the character of the oil distribution in the pores and the microstructure wettability.