共查询到20条相似文献,搜索用时 0 毫秒
1.
Physics of the Solid State - In accordance with the orientation ratio (110), [001]β || (111), [$$1\bar {1}0$$]α established by fast electron diffraction between the ordered (β) and... 相似文献
2.
Shibkov A. A. Gasanov M. F. Zolotov A. E. Zheltov M. A. Denisov A. A. Kol’tsov R. Yu. Kochegarov S. S. 《Technical Physics》2020,65(1):78-86
Technical Physics - The spatiotemporal structures of Portevin–Le Chatelier deformation bands at the stage of neck formation and fracture of an aluminum–magnesium alloy deformed in an... 相似文献
3.
Optics and Spectroscopy - The influence of chitosan on orientation–micellar association of Pluronic F-127 in an aqueous medium in the temperature range of 4–37°C has been studied... 相似文献
4.
Physics of the Solid State - The traps of charge carriers in thermal films of silicon dioxide and silicon dioxide with a nanocomposite layer consisting of silicon oxide and silicon nanocrystallites... 相似文献
5.
The solid state diffusion-controlled growth of the phases is studied for the Au–Sn system in the range of room temperature to 200 °C using bulk and electroplated diffusion couples. The number of product phases in the interdiffusion zone decreases with the decrease in annealing temperature. These phases grow with significantly high rates even at the room temperature. The growth rate of the AuSn4 phase is observed to be higher in the case of electroplated diffusion couple because of the relatively small grains and hence high contribution of the grain boundary diffusion when compared to the bulk diffusion couple. The diffraction pattern analysis indicates the same equilibrium crystal structure of the phases in these two types of diffusion couples. The analysis in the AuSn4 phase relating the estimated tracer diffusion coefficients with grain size, crystal structure, the homologous temperature of experiments and the concept of the sublattice diffusion mechanism in the intermetallic compounds indicate that Au diffuses mainly via the grain boundaries, whereas Sn diffuses via both the grain boundaries and the lattice. 相似文献
6.
Yu. M. Smirnov 《Journal of Applied Spectroscopy》2010,77(3):301-308
The excitation of 3D levels of strontium atom by slow monoenergetic electrons has been studied experimentally. Thirty six excitation cross-sections
were measured at 30-eV electron energy. Optical excitation functions for most of the transitions were recorded in the 0–200-eV
electron-energy range. The excitation cross-section as a function of the principal quantum number has been found to correspond
to a power law for all 3D series. 相似文献
7.
Bazilevskaya G. A. Kalinin M. S. Krainev M. B. Makhmutov V. S. Svirzhevskaya A. K. Svirzhevsky N. S. Stozhkov Yu. I. 《Journal of Experimental and Theoretical Physics》2022,134(4):479-486
Journal of Experimental and Theoretical Physics - We compare the quasi-biennial variations and Rieger-type variations (on a timescale of less than 1 year) in solar activity, interplanetary... 相似文献
8.
Yu. M. Smirnov 《Russian Physics Journal》2000,43(10):839-842
The behavior of the constants A
i. and
i
that characterize the dependence of the dissociation excitation cross sections on the main quantum number of the upper energy level is analyzed for spectral series of the cesium atom in collisions of electrons with cesium–halide molecules. In addition to a similarity, some deviations from analogous regularities established previously for the halides of other alkali metals are also found. 相似文献
9.
10.
We investigate the guided waves in a multi-layered cylindrical elastic solid medium. The dispersion function of guided waves is usually complex and the dispersion curves of all modes are not conveniently obtained. Here we present an effective method to obtain the dispersion curves of all modes. First, the dispersion function of the guided waves is transformed into a real function. The dispersion curves are then calculated for all the modes of the guided waves by the bisection method. The modes with the orders n = 0, 1, and 2 are analysed in two- and three-layer media. The existence condition of Stoneley wave is discussed. The modes of the guided waves are also investigated in a two-layer medium, in which the velocity of shear wave in the outer layer is less than that in the inner layer. 相似文献
11.
In paired Fermi systems,strong many-body effects exhibit in the crossover regime between the Bardeen-CooperSchrieffer(BCS)and the Bose-Einstein condensation(BEC)limits.The concept of the BCS-BEC crossover,which is studied intensively in the research field of cold atoms,has been extended to condensed matters.Here by anal.yzing the typical superconductors within the BCS-BEC phase diagram,we find that FeSe-based superconductors are prone to shift their positions in the BCS-BEC crossover regime by charge doping or substrate substitution,since their Fermi energies and the superconducting gap sizes are comparable.Especiall.y at the interface of single-layer FeSe on SrTiO_3 substrate,the superconductivity is relocated closer to the crossover unitary than other doped FeSe-based materials,indicating that the pairing interaction is effectively modulated.We further show that hole-doping can drive the interfacial system into the phase with possible pre-paired electrons,demonstrating its flexible tunability within the BCS-BEC crossover regime. 相似文献
12.
M. F. Bulanyi A. A. Gorban' A. V. Kovalenko S. A. Omel'chenko 《Journal of Applied Spectroscopy》2002,69(1):155-157
The EPR technique is used to study the behavior of photosensitive paramagnetic centers (PPC) in zinc sulfidebased single crystals under different conditions of excitation by UV radiation. 相似文献
13.
Optics and Spectroscopy - Pulsed laser ablation of different surfaces in liquid environment has broad prospects to selectively synthesize nanoparticles (NPs) with specific optical properties, as... 相似文献
14.
Aruev P. N. Belik V. P. Zabrodskii V. V. Kruglov E. M. Nikolaev A. V. Sakharov V. I. Serenkov I. T. Filimonov V. V. Sherstnev E. V. 《Technical Physics》2020,65(8):1333-1339
Technical Physics - We have designed a silicon avalanche photodiode for detecting vacuum ultraviolet radiation. The external quantum yield of a silicon avalanche photodiode has been investigated in... 相似文献
15.
Sabirov L. M. Ismailov F. R. Kadirov Sh. A. Karshibaev Sh. E. 《Optics and Spectroscopy》2021,129(1):51-55
Optics and Spectroscopy - Ratios of the intensities of the fine-structure components at molecular light scattering (Landau–Placzek ratios) have been investigated depending on the... 相似文献
16.
S.C. Agarwal 《哲学杂志》2013,93(34):4213-4220
The effect of light soaking (LS) on the properties of hydrogenated amorphous silicon (a-Si:H) presents many challenging puzzles. We look at some of them, along with their present understanding. In particular, the role of the heterogeneities in LS is examined. We find that for most of the solved as well as unsolved puzzles, the long-range potential fluctuations arising from the heterogeneities in the films, afford an alternative view which looks quite plausible. The implications of such considerations are used to speculate on the possibility of making stable a-Si:H solar cells. 相似文献
17.
A. N. Panova B. V. Grinev F. F. Lavrent'ev L. M. Soifer K. V. Shakhova N. N. Kosinov A. I. Mitichkin S. P. Korsunova 《Journal of Applied Spectroscopy》2004,71(4):546-552
The influence of the concentration of an activator (C
NaI) and of plastic deformation on a change in the contribution of a slow component to the decay of the -scintillations of CsI–Na crystals was investigated, as well as the influence of C
NaI on a change in the shape of the luminescence excitation spectrum in the region of absorption of activator centers (AC) and of vacancy-related centers (VRC) and also on a change in the intercenter time of deexcitation of the centers indicated. It is shown that AC and VRC participate in the photoluminescence and -scintillations of CsI–Na crystals. In the -scintillations, AC are responsible for the component 1 = 370 nsec, whereas the components 1 = 460 nsec and 2 2 sec are associated with VRC. The reduction of 1 from 770 to 560 nsec with an increase in C
NaI from 2·10–3 to 3·10–2 mole% and from 570 to 470 nsec after plastic deformation of the crystals ( = 5%) along the 111 axis is caused by a decrease in the number of VRC. The mechanisms underlying the -scintillations of the CaI–Na crystals containing AC and VRC and also the decrease in the number of VRC are discussed. 相似文献
18.
R.I.Eglitis M.R.Philpott 《中国物理快报》2002,19(3):389-390
The semi-empirical Hartree-Fock intermediate neglect of differential overlap (INDO) method was used to explore the potential energy surface of adsorbed water molecules and to speculate,using fairly simple chuster models,on the reaction path followed by metal ions leaving the surface.As an example,INDO calculations were used to calculate the potential energy curve for a metal atom leaving the surface and entering into a solvation cage composed of tetrahedral arranged water molecules.The effect of adding a NaCl ion pair to the system with the halide ion above the dissolving atom was also explored. 相似文献
19.
《Composite Interfaces》2013,20(5-7):533-549
This paper investigates the effect of the interphase properties and the interfacial interactions between matrix and filler on mechanical properties of precipitated calcium carbonate (PCC)–polypropylene nanocomposites. PCC particles were coated with stearic acid (SA). The weight ratio of SA on the particles (w SA) ranged from 0 to 0.135 g SA/g PCC. The introduction of PCC particles resulted in an increase in stiffness and yield stress compared with the pristine polymeric matrix and, at the same time, it increased the impact resistance. The maximum improvement in the impact behaviour was achieved for the composites with w SA =0.045 corresponding to the theoretical monolayer ratio. A decrease in interfacial interactions between monolayer coated PCCs and the matrix with respect to the uncoated particles was observed by using a semi-empirical equation developed by Pukànszky. The low degree of interfacial interactions between particulate filler and matrix allows a matrix–particle debonding phenomenon, as shown by scanning electron microscopy analysis. Extensive plastic deformations were evident as well, promoting an improvement in toughness. The thickness of the interphase between particles and matrix was evaluated by using the Shen–Li model which is based on the hypothesis of a non-homogeneous interphase. It results that the thickness increased in the order uncoated < monolayer coated < 3% SA coated ? 13.5% SA coated particles. The thinner and stronger interphase found for the composite with uncoated particles can be explained with the high interaction between matrix and filler and the consequent low mobility of the polymeric chains. 相似文献
20.
Excitation of Elastic Wave of an Arbitrary Plane Source on Surface of a Multilayered Medium
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We investigate the elastic waves excited by an arbitrary plane piezoelectric source on the surface of a multilayered medium. Based on the previous studies, the 2D elastic wavefield in the multilayered medium is extended to 3D space. The propagator matrix for the 3D wavefield is investigated and the displacement-stress response for the boundary conditions is obtained. The excitation and propagation of the Rayleigh and Love waves are analysed further. It is found that the propagation velocity of the Rayleigh and Love waves does not depend on the propagation azimuth θ in the plane parallel to the free surface of the multilayered medium while the displacement is strongly dependent on the azimuth θ. 相似文献