共查询到20条相似文献,搜索用时 15 毫秒
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M. S. Noskova 《Journal of Applied Spectroscopy》2004,71(2):215-221
A system of differential equations describing the optical transfer function (OTF) of a binary Markovian mixture is considered in a small-angle approximation. Its analytical solution has been found for the case where the mixture components have different extinction and scattering coefficients but identical scattering indicatrixes. The results of investigation show that the optical transfer function of the binary Markovian mixture depends strongly on the dimensions of nonuniformities and on the difference between the optical parameters of the mixture components, but it always markedly exceeds the optical transfer function of a uniform medium. 相似文献
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E. Bringuier 《哲学杂志》2013,93(11):1653-1664
In a liquid suspension, thermophoresis is the motion of a suspended particle under a temperature gradient. In a liquid binary mixture, thermodiffusion is the generation of a composition gradient upon application of a temperature gradient. A quantitative connection is established between the two phenomena without making assumptions about their mechanisms. It is shown that Galilean invariance and the choice of a Galilean reference frame play a key role in that connection. The results are not restricted to very dilute suspensions or mixtures. 相似文献
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In this paper, we obtain the generalization of the BBGKY hierarchy for a binary mixture of chemically neutral particles. Using modified boundary conditions different from the ones proposed by Bogoliubov, we solve the hierarchy, and obtain explicitly the set of two-particle distribution functions for the several species of the mixture, up to first order in the density. 相似文献
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Sei Hachisu 《Phase Transitions》2013,86(2-4):243-249
The formation of an NaCl structure in a mixture of a monodisperse silica sol with particle diameter of 5300 A and a gold sol with average particle size of 800 A is described. The mixture was left still for a month, and the particles settled to form a dense layer at the bottom, where phase separation appeared. In the ordered phase only gold particles were observed microscopically as bright spots at their individual lattice points, being arranged in hexagonal or in square pattern. From the distance between the particles in the square pattern and hexagonal pattern, the lattice type for gold particles was concluded to be fcc. Further, it was known that four gold particles forming a square hold one silica particle in its center. On these grounds, the entire lattice was concluded to be of the NaCl-type. 相似文献
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The radial distribution function (RDF) and thermodynamic properties of a two-dimensional hard-disc mixture are calculated by using the perturbation theory. Numerical
results are given for theRDF, pressure and excess-free energy of the binary mixture of both additive and non-additive hard discs. It is found that the
thermodynamic properties of the binary mixture of non-additive hard discs increase with Δ, the non-additive parameter. 相似文献
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W. W. Wood 《Journal of statistical physics》1989,57(3-4):675-727
The long-time tails for the mutual diffusion coefficient, the thermal diffusivity, the thermal conductivity, and the shear and longitudinal viscosities (from which the tail of the bulk viscosity can be calculated) of a nonreactive binary mixture are calculated from mode-coupling theory, and compared with a prior calculation by Pomeau. Three different choices of the thermal forces and currents are considered, with the results found to take their simplest form in the case of the de Groot double-primed set. The decompositions into the kinetic, potential, and cross terms are given. 相似文献
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This paper is devoted to the study of the hydrodynamic stage of a two-component dense fluid. Starting from the BBGKY hierarchy obtained earlier, we first derive the expressions for the generalized fluxes. We proceed to set up the generalized kinetic equations, using Bogoliubov's functional assumption. Then we solve these equations by means of a Chapman-Enskog method. The generalized expressions for the transport coefficients are thus obtained. All our results are independent of the existence of density expansions of the relevant quantities. 相似文献
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We report the results of our studies on optical and thermal properties of two non-mesogenic compounds, namely, didodecyl dimethyl ammonium bromide (DDAB) and glacial acetic acid. The mixture exhibits schlieren texture of lyotropic micellar nematic (ND), SmA, SmB, and SmG phases, respectively, at different concentrations of DDAB sequentially when the specimen is cooled from isotropic phase. The order parameter (S) of lyotropic micellar nematic (ND) phase is estimated with the help of temperature dependence of optical anisotropy from the measured values of refractive index and density data. The temperature variation of order parameter of the experimental curve is in agreement with the Mayer–Saupe theoretical curve. The formation of the above phases has been confirmed by optical studies. 相似文献
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Phase behaviors in a binary mixture of diblock copolymers confined between two parallel walls 下载免费PDF全文
The phase behaviors in a binary mixture of diblock copolymers confined between two parallel walls are investigated by using a cell dynamics simulation of the time-dependent Ginzburg-Landau theory.The morphological dependence of the wall-block interaction and the distance between walls(confinement degree) has been systematically studied,and the effect of repulsive interactions between different monomers is also discussed.It is interesting that multiple novel morphological transitions are observed by changing these factors,and various multilayered sandwich structures are formed in the mixture.Furthermore,the parametric dependence and physical reasons for the microdomain growth and orientational order transitions are discussed.From the simulation,we find that much richer morphologies can form in a binary mixture of diblock copolymers than those in a pure diblock copolymer.Our results provide an insight into the phase behaviors under parallel wall confinement and may provide guidance for experimentalists.This model system can also give a simple way to realize orientational order transition in soft materials through confinement. 相似文献
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为了探究Soret效应对具有自由表面的圆柱形浅液池内双组分溶液热对流过程的影响, 通过实验观察了质量分数为50%的正癸烷/正己烷混合溶液在不同深宽比的液池内流动失稳后的自由表面耗散结构及液池内的温度波动. 结果表明, 双组分溶液流动失稳的临界热毛细Reynolds数小于纯工质的值, 且其随液层深宽比的变化规律与纯工质相同. 当深宽比小于0.0848时, 流动失稳后在自由表面观察到热流体波, 监测点处温度波动主频随热毛细Reynolds数增大而增加; 当深宽比大于0.0848时, 随热毛细Reynolds数的增大, 流动失稳后自由表面依次呈现轮辐状、花苞状、分离-合并-分离交替变化的条纹状结构. 相似文献
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Phase behaviors in binary mixture of diblock copolymers confined between two parallel walls 下载免费PDF全文
The phase behaviors in binary mixture of diblock copolymers confined between two parallel walls are investigated by using cell dynamics simulation of the time-dependent Ginzburg-Landau theory. The morphological dependence of the wall-block interaction and the distance between walls (confinement degree) has been systematically studied, and the effect of repulsive interactions between different monomers is also discussed. It is interesting that multiple novel morphological transitions are observed by changing these factors, and various multilayered sandwich structures are formed in the mixture. Furthermore, the parametric dependence and physical reasons for the microdomain growth and orientational order transitions are discussed. From the simulation, we find that much richer morphologies can form in binary mixture of diblock copolymers than those in pure diblock copolymer. Our results provide an insight into the phase behaviors under parallel walls confinement and may provide guidance for experimentalists. This model system can also give a simple way to realize orientational order transition in soft materials through confinement. 相似文献
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混合流体Rayleigh-Bénard对流是研究非平衡对流的非线性动力学特性的典型模型之一.基于流体力学方程组的数值模拟,首先探讨了矩形腔体中具有强Soret效应(分离比Ψ=-0.60)的混合流体行波对流的分叉特性及斑图演化,沿着分叉曲线的上部分支,随着相对瑞利数的增加,此系统依次出现了局部行波对流、具有缺陷的行波对流、行波对流、摆动行波对流及定常对流5种行波对流解.然后,研究了分离比Ψ对对流解的影响,与弱Soret效应(Ψ=-0.11)时的对流解相比较,强Soret效应(Ψ=-0.60)时出现的对流解更丰富.由于有强Soret效应的对流的复杂性,Ψ=-0.60时的对流解与Ψ=-0.20,-0.4时的对流解不同. 相似文献
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V. M. Katarkevich A. N. Rubinov T. Sh. Éfendiev I. M. Gulis E. A. Ermilov 《Journal of Applied Spectroscopy》2000,67(3):467-472
Polarization of the radiation generated by a distributed-feedback laser on one-component solutions and binary mixtures of
coumarin dyes is investigated. It is established that, with a marked excess of the generation threshold, the degree of polarization
P of the radiation generated by one-component solutions is practically independent of the wavelength. For binary mixtures,
the spectral behavior of P depends on the donorlacceptor concentration ratio. Here, with the anisotropy of the distribution
of excited molecules being partially disrupted in the process of energy transfer (from the donor to the acceptor), the degree
of polarization decreases appreciably when radiation frequency is tuned from the short-wavelength region to the long-wavelength
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 67, No. 3, pp. 340–343, May–June, 2000. 相似文献
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The present investigation deals with the binary mixture of two non-mesogenic compounds, viz. sodium oleate (Naol) and orthophosphoric acid (H3PO4) which exhibits very interesting liquid crystalline smectic phases at large range of concentrations and temperature. The mixtures with concentrations ranging from 10% to 90% Naol in H3PO4 exhibit SmA, SmC, SmE and SmB phases, sequentially when the specimen is cooled from its isotropic phase. Physical properties, such as ultrasonic velocity, adiabatic compressibility and molar compressibility, show anomalous behavior at the isotropic to mesosphase transition. 相似文献
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准分子激光束的喇曼组束 总被引:5,自引:3,他引:2
受激喇曼散射可以将紫外准分子激光辐射频移到特定的近紫外或可见光波长,采用喇曼整形技术可以改善斯托克斯光的光束质量,本文报道喇曼组束提高喇曼整形效率的实验结果. 相似文献