共查询到20条相似文献,搜索用时 109 毫秒
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V. A. Shalygin A. N. Sofronov L. E. Vorob’ev I. I. Farbshtein 《Physics of the Solid State》2012,54(12):2362-2373
The current-induced optical activity in a tellurium single crystal has been experimentally investigated in the mid-infrared spectral region. The phenomenological theory of the current-induced optical activity has been considered and the microscopic mechanism of this phenomenon has been described. The dependence of the degree of spin polarization of holes in tellurium on the electric current density has been determined. An approximate analytical expression relating the current-induced optical activity to the degree of spin polarization of holes has been obtained. 相似文献
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Evolution of optical pulses, which propagate in strained graphene, has been investigated. The effective wave equation for the vector potential of the electromagnetic field has been derived. The tensile strain of graphene layers has been described using the effective vector-potential in terms of the gauge theory. The numerical solution of the derived wave equation has been presented and the dependence of the pulse strength and shape on the magnitude of the external strain has been analyzed. 相似文献
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E. M. Baitinger E. A. Belenkov M. M. Brzhezinskaya V. A. Greshnyakov 《Physics of the Solid State》2012,54(8):1715-1722
The experimental results of a comprehensive investigation of the structure of detonation synthesis nanodiamonds by electron microscopy methods have been presented. The morphology of diamond nanoparticles has been investigated and the microdiffraction patterns have been analyzed. The method of characteristic fast electron energy loss spectroscopy in transmission electron microscopy has been used. The local density of structural components of a nanodiamond (diamond core and fullerene-like shell) has been obtained. The shape of the shell surrounding the nanocrystal has been determined using model calculations. A hypothesis explaining the charging of the nanodiamond surface has been proposed. 相似文献
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The phase-sensitive nature of polarization modulation instability has been demonstrated in optical fibers whose birefringence has been manipulated to generate phase mismatches. Quasi-phase-matched modulation instability has been demonstrated, and the gain of the quasi-phase-matched sidebands has been investigated. The results are in good agreement with experiment. 相似文献
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北京正负电子对撞机二期(BEPCⅡ),国产500 MHz超导腔经过紧张的安装调试于2017年10月正式投入带束流运行。首先对此国产超导腔两次降温调试的相关参数进行了监测和对比分析;其次研究了通过高功率老练的方法改善超导腔的品质因数,并实时监测超导腔老练过程中的辐射剂量;最后对超导腔的带束流运行情况进行了介绍分析。结果表明:BEPCⅡ国产500 MHz超导腔虽然放置了6年,但是状态良好,通过高功率老练能够降低超导腔的辐射剂量,改善其性能,完全满足束流运行要求。 相似文献
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A. V. Rogachev A. I. Kuklin A. Yu. Cherny A. N. Ozerin A. M. Muzafarov E. A. Tatarinova V. I. Gordeliy 《Physics of the Solid State》2010,52(5):1045-1049
The structure of organosilicon dendrimers of the ninth generation with the four-functional core and butyl terminal groups
has been studied by small-angle neutron scattering. It has been demonstrated that the dendrimers are monodisperse objects
with an anisometric shape. The partial volume and the average scattering density have been determined using the contrast variation
technique. It has been shown that the dendrimers under study are identical in overall sizes and scattering density distribution.
It has been revealed that 20% of the overall volume of the dendrimer is accessible for the penetration of the solvent. The
distribution of the scattering length density in the dendrimers has been simulated and reconstructed using the Monte Carlo
method, and a change in the excluded volume for different contrasts has been revealed. The specific features of the spatial
structure of organosilicon dendrimers of higher generations have been discussed. 相似文献
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Zitterbewegung (trembling motion) in thin-film topological insulators in the presence of a terahertz pump pulse has been considered. An analytical expression for the electric current density has been derived, which describes the electric current induced by the motion of an electron wave packet. The electron subsystem has been considered in the long-wavelength approximation, and the electromagnetic field has been described classically in the constant-pump approximation. The numerical analysis of the results has been carried out. 相似文献
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The system of nonlinear equations describing a surface-stabilized ferroelectric smectic C* liquid crystal in the chevron geometry has been investigated by numerical methods in the framework of the continuum model
of liquid crystals. Stable orientational and structural configurations have been studied, and the results obtained have been
compared with those derived using simplified models. The height of the potential barrier separating two stable configurations
has been determined, and the transition between them under the action of the external electric field has been examined. It
has been demonstrated that this effect has a threshold character. The dependence of the threshold field on the film thickness
has been analyzed. 相似文献
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The flow of water mist in a narrow duct has been studied experimentally. The profile of the velocity of drops has been measured, and the viscosity of the mist has been calculated using the Navier–Stokes equation. It has been found that at low gradients of the rate of shear the viscosity of the mist can exceed that of clean air by tens and even hundreds of times. The electric charge of the drops has been measured. It has been found that the viscosity of the mist differs from that of clean air at gradients of the rate of shear that are less than the frequency of the establishment of electric equilibrium between the drops. A comparative analysis of the viscosities of the mist and a drop cluster has been carried out, and the dependence of the viscosity of the water aerosol on the radius and the charge of the drops has been predicted. The possible role of aerosols that contain submicron drops in the known “clear air turbulence” problem has been shown. 相似文献
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The possibility of unlimited surfatron acceleration of nonrelativistic charged particles by slow electromagnetic waves has been revealed. The capture into such an acceleration regime has been described. The region of the parameters in which the effect of the capture and acceleration exists has been considered. The contribution of this mechanism to an increase in the energy of charged particles in the Earth’s magnetosphere has been estimated. 相似文献
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The interaction of a palladium nanocontact with a hydrogen molecule has been studied using molecular static method. The influence
of impurity on the atomic structure and mechanical properties of the palladium nanocontact has been demonstrated. The characteristic
interatomic distance has been determined in this contact. It has been found that the hydrogen molecule dissociates by interaction
with nanocontact atoms. 相似文献
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Thanassis Speliotis Dimitris Niarchos Patrick Meneroud G. Magnac Franck Claeyssen John Pepin Claude Fermon M. Pannetier N. Biziere 《Journal of magnetism and magnetic materials》2007
The feasibility to develop mini- and micro-magnetic electro-mechanical systems (MEMS) has been evaluated by prototyping of a single-phase stepper motor. The main targeted application of such device is the watch industry needing micro-motors in huge quantities at low cost. The motor part that required the greatest efforts has been the magnet, which cannot yet be found in film layer. The screen-printing technology has been used for the production of NdFeB-based magnets whose properties have been characterised. The thick film magnets have been integrated in the stepper motor specially designed for this purpose. The whole motor has been characterised and conclusions are drawn on the possibility of producing thick film magnets for magnetic MEMS. 相似文献
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The thermoluminescence of x-irradiated CaSO4: Dy phosphors has been studied for diverse activator concentrations. The concentration-dependence of these phosphors on the
increase of glow peak intensities has been found to be remarkable. For higher concentration of dysprosium the concentration
quenching effect has been observed. This has been attributed to the resonant transfer of energy from one activator atom to
another, bringing the possible migration of energy in a solid, which is likely to get dissipated without luminescence, at
the quenching site itself. The effect of irradiation time on the glow peak intensities reveals the initial linearity and a
subsequent decrease indicating the possible radiation damage. The role of Na2SO4 as a charge compensator has been studied in detail. An attempt has been made to unravel the type of kinetics involved in
the process, by calculating the activation energies by different methods. It has been concluded that the type of kinetics
involved in the process is bimolecular. 相似文献
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The problem of the features of the electron energy spectrum in a quantum parallelepiped has been considered. The family of triply degenerate energy levels has been found for the chosen model of the quantum parallelepiped. The optical transitions in this system has been investigated. It has been established that primitive Pythagorean triples are in the basis of every family of triply degenerate levels and this fact is directly reflected on the optical properties of the quantum dashes. In particular, due to the selection rules for the electronic transitions, it is possible to "visualize" Pythagorean triples theoretically. The dependence of absorption coefficient on the incident photon energy of quantum dash ensemble has been studied. The dipole, quadrupole moments and the electrostatic field created by the electron localized in a quantum dash have been investigated. 相似文献
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文中用谐振子乘积基展开法求解了四体系统的Schrdinger方程.通过分析波函数及形状密度函数在多维坐标空间的分布,比较了四体全对称0+态,四体金对称0-态和四体全反对称0+态,四体全反对称0-态的结构和内部运动的差异;讨论了对称性的影响. 相似文献
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The onset of instability in a layer of dielectric micropolar fluid under the simultaneous action of an AC electric field and temperature gradient has been investigated. The dispersion relation has been derived and various critical values of non-dimensional Rayleigh number in the fluid layer have been determined. The influence of micropolar viscosity and electric Rayleigh number on the onset of convection has been analyzed. Thermal Rayleigh number has been computed for various values of electric Rayleigh number for the onset of instability. The stabilizing and destabilizing effects of electric Rayleigh number, micropolar viscosity and Prandtl number have been discussed. 相似文献