共查询到20条相似文献,搜索用时 156 毫秒
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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
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选择高密度流体He H2混合物作为研究对象,用Ree混合规则和van der Waals单组分流体变分微扰理论加量子力学一级修正模型编制计算程序。作为对计算模型及其程序的检验,首先用已有的α-exp-6优化势参数,计算了T=300K的He H2混合物的等温相平衡线,得到了与实验值和分子动力学(MD)数值模拟一致的结果,然后进一步计算了0~60GPa和50~7000K压力温度范围内的流体He H2混合物(He H2分别为1:1、1:3、3:1摩尔比)的高压物态方程。与Monte-Carlo模拟数据所进行的比较表明,在低温下,量子力学修正对热力学量的计算是重要的。 相似文献
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地层油气的相平衡热力学研究王利生(北京理工大学化工学院北京100081)关键词混合规则,状态方程,油藏流体,相平衡1链状分子的普遍化范德华配分函数链状分子的转动和振动运动会受阻于其它分子的运动,因而其配分函数中的转动和振动贡献与温度、密度均有关,被分... 相似文献
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The yield stress of our newly developed electrorheological (ER)
fluids consisting of dielectric nano-particles suspended in silicone oil
reaches hundreds of kPa, which is orders of magnitude higher than that of
conventional ones. We found that the polar molecules adsorbed on the
particles play a decisive role in such new ER fluids. To explain this polar
molecule dominated ER (PM-ER) effect a model is proposed based on the
interaction of polar molecule-charge between the particles, where the local
electric field is significantly enhanced and results in the polar molecules
aligning in the direction of the electric field. The model can well explain
the giant ER effect and a near-linear dependence of the yield stress on the
electric field. The main effective factors for achieving high-performance
PM-ER fluids are discussed. The PM-ER fluids with the yield stress higher
than one MPa can be expected. 相似文献
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In this article we have constructed and studied using the Monte Carlo and transfer-matrix techniques the simple lattice gas models of self-assembled monolayer, which consists of molecules with different orientations in the adlayer on the stepped surfaces. It was shown that in the case of adsorption of complex molecules the surface heterogeneity of stepped type leads to a great variety of ordered structures comparatively with homogeneous one. The constructed models fairly well reproduce the main features of real SAMs consisting of molecules with different orientations with respect to interface and the model ordered phases are also analogues to the structures of real SAMs. 相似文献
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The study puts toward a theoretical model describing the fluorescence parameters for concentrated solid solutions consisting
of complex molecules of two types (donor-acceptor) with nonradiative transfer of electronic-excitation energy with intense
pulse excitation. Consideration is given to the dynamics of quenching of the luminescence of the donor molecules due to transfer
of electronic-excitation energy to the acceptor molecules. Numerical results are presented in the form of approximation formulas.
To whom correspondence should be addressed.
Belarusian State University, 4, F. Skorina Ave., Minsk, 220050, Belarus. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 66, No. 5, pp. 652–656, September–October, 1999. 相似文献
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In this paper, a modified version of the solution in form of a Gramian formula is employed to investigate a new type of multiple lump molecule solution of the Kadomtsev–Petviashvili I equation. The high-order multiple lump molecules consisting of M N-lump molecules are constructed by means of the Mth-order determinant and the non-homogeneous polynomial in the degree of 2N. The interaction solutions describing P line solitons radiating P of the M N-lump molecules are constructed. The dynamic behaviors of some specific solutions are analyzed through numerical simulation. All the results will enrich our understanding of the multiple lump waves of the Kadomtsev–Petviashvili I equation. 相似文献
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《Surface science》1987,179(1):101-118
Harmonic oscillator models are used to explain recent experimental data on infrared absorption by CO molecules adsorbed on two stepped platinum surfaces. These data reveal only a lower frequency band at low coverage and only a higher frequency band at high coverage. Both bands exist over a range of intermediate coverages. The data are explained by a coupled-dipole model which includes the effects of electronic polarizability, the tilted orientation of CO molecules at step sites, and the electric field enhancement at step sites. The lower-frequency band is associated with CO molecules adsorbed on step sites and the higher-frequency band is associated with two-dimensional islands consisting of both step and terrace CO. The model explains the observed variation of frequency and intensity with coverage for CO adsorption on Pt(533) and Pt(432) surfaces. The model calculations indicate that the wavenumber for a single, linearly bonded CO molecule is about 9 cm−1 higher on a terrace site than on a step site. 相似文献
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A. A. Zabolotskii 《Journal of Experimental and Theoretical Physics》2006,102(3):380-393
Electromagnetic field propagation is analyzed in a one-dimensional Bragg grating consisting of periodically arranged linear molecules making up a resonant medium. Dye J-aggregates and conjugated polymers are considered as examples of the medium. Both adiabatic and nonadiabatic dynamics of the acoustic waves generated by electromagnetic field in the system are examined. The effects of exciton-phonon and exciton-phonon-photon interactions on the band structure and formation of self-localized excitations are examined on various time scales. A new mechanism for controlling bandgap parameters in a bistable regime is described. Some effects of electromagnetic-field nonuniformity on generation of phonons in molecules and exciton self-localization are investigated. 相似文献
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Soliton Molecules,Asymmetric Solitons and Hybrid Solutions for(2+1)-Dimensional Fifth-Order Kd V Equation 下载免费PDF全文
《中国物理快报》2019,(12)
Soliton molecules were first discovered in optical systems and are currently a hot topic of research. We obtain soliton molecules of the(2+1)-dimensional fifth-order Kd V system under a new resonance condition called velocity resonance in theory. On the basis of soliton molecules, asymmetric solitons can be obtained by selecting appropriate parameters. Based on the N-soliton solution, we obtain hybrid solutions consisting of soliton molecules,lump waves and breather waves by partial velocity resonance and partial long wave limits. Soliton molecules,and some types of special soliton resonance solutions, are stable under the meaning that the interactions among soliton molecules are elastic. Both soliton molecules and asymmetric solitons obtained may be observed in fluid systems because the fifth-order Kd V equation describes the ion-acoustic waves in plasmas, shallow water waves in channels and oceans. 相似文献
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本文基于扩散动力学,建立了一种新的药物小分子穿越磷脂双层膜输运的理论模型,研究药物小分子穿越磷脂双层膜输运的动态过程,考察药物小分子跨膜输运过程中的时间延迟(时滞)效应。研究发现,药物小分子在数分钟内穿越磷脂双层膜各区域进入细胞,由于时滞效应,穿膜过程呈现了周期性演化特性。当药物小分子数量增加到一定程度,磷脂分子层会出现微小孔,让积累的药物小分子快速通过。通过分析模型中各参数的敏感性,我们还发现,药物小分子在磷脂双层膜内不同区域的扩散特性,以及输运过程的时滞性,都会对药物小分子穿越磷脂双层膜的动力学有较大程度的影响。理论结果符合模拟、实验观测,进一步深刻揭示了药物小分子穿越磷脂双层膜的穿膜特性,可为设计确切的疗法药物提供必要的参考和新方案。 相似文献
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Based on the property of heterogeneous traffic flow, we in this Letter present a new car-following model. Applying the relationship between the micro and macro variables, a new dynamic model for heterogeneous traffic flow is obtained. The fundamental diagram and the jam density of the heterogeneous traffic flow consisting of bus and car are studied under three different conditions: (1) without any restrictions, (2) under the action of the traffic control policy that restrains some private cars and (3) using bus to replace the private cars restrained by the traffic control policy. The numerical results show that our model can describe some qualitative properties of the heterogeneous traffic flow consisting of bus and car, which verifies that our model is reasonable. 相似文献