Theoretical Investigation of Uniform and Non-uniform Penetrable Sphere Fluid

A bridge function approximation is proposed for a single-component fluid consisting of penetrable sphere interacting via a potential that remains finite and constant for center-center distance smaller than the particle diameter and is zero otherwise. The radial distribution function from the Ornstein-Zernike integral equation combined with the present bridge function approximation is in satisfactory agreement with the corresponding simulation data for all of the investigated state points. The presently calculated excess Helmholtz free energy respectively based on virial route and compressibility route is highly self-consistent, and is in very good agreement with simulational results for the case of low temperatures. The present bridge function approximation, combined with the bridge density functional approximation, can reproduce very accurately density profiles of the penetrable sphere fluid confined in a hard spherical cavity for all the cases where simulational results are available.     

平行硬壁间荷电硬球流体的密度泛函理论研究

基于经典流体的密度泛函理论并结合改进的基本度量理论, 研究了受限于平行硬壁间的荷电硬球流体的平衡密度分布. 通过对比有、无外电场时分子数密度分布的相应变化情况, 分析了荷电硬球分子间的库仑排斥势能与场致势能间的竞争作用, 研究了电场对于受限荷电硬球流体系统聚集态结构的影响.     

气中水含量对气藏流体相态与渗流的影响

考虑地层水的蒸发对烃类气藏生产的影响的研究较少,研究认为,从地层到地面过程中,气中水蒸汽含量的变化规律有3个阶段：近井区域的气-水两相平衡阶段;井底附近的未饱和阶段;井筒中某一点到地面的非平衡的“过饱和阶段”,也就是凝析水的产生。同时考虑到由于井底附近压力的降低,地层水的再蒸发,还可能对井底附近的储层造成盐堵,从而降低其渗透率对生产造成影响。当烃类气的组分含量变大时,平衡时其饱和水蒸汽含量相对较大;考虑实际地层中水蒸汽存在时,无论从实验室还是相平衡计算的结果来看,都使凝析气的露点压力有所降低。     

Stability of theoretical model for catastrophic weather prediction

Stability related to theoretical model for catastrophic weather prediction, which includes non-hydrostatic perfect elastic model and anelastic model, is discussed and analyzed in detail. It is proved that non-hydrostatic perfect elastic equations set is stable in the class of infinitely differentiable function. However, for the anelastic equations set, its continuity equation is changed in form because of the particular hypothesis for fluid, so "the matching consisting of both viscosity coefficient and incompressible assumption" appears, thereby the most important equations set of this class in practical prediction shows the same instability in topological property as Navier-Stokes equation, which should be avoided first in practical numerical prediction. In light of this, the referenced suggestions to amend the applied model are finally presented.     

Mathematical concepts and their physical foundation in the nonstandard analysis theory of turbulence

Main mathematical concepts and their physical foundation in the nonstandard analysis theory of turbulence are presented and discussed. The underlying fact is that there does not exist the absolute zero fluid-volume. Therefore, the physical object corresponding to the absolute point is just the uniform fluid-particle. The fluid-particle, in general, corresponds to the monad. The uniform fluid-particle corresponds to the uniform monad, while the nonuniform fluid-particle to the nonuniform monad. There are two kinds of the differentiations, one is based on the absolute point, and the other based on the monad. The former is adopted in the Navier--Stokes equations, and the latter in the fundamental equations presented in this paper for the nonstandard analysis theory of turbulence. The continuity of fluid is elucidated by virtue of the concepts of the fluid-particle and fluid-particle at a lower level. Furthermore, the characters of the continuity in two cases, i.e. in the standard and nonstandard analyses, are presented in this paper. And the difference in discretization between the Navier--Stokes equations and the fundamental equations given herein is also pointed out.     

天然流体包裹体中甲烷水合物生成条件原位变温拉曼光谱研究

准确获取流体包裹体中气体水合物的生成条件一直是传统包裹体分析方法面临的一个难题。文章采用原位拉曼光谱技术分析了天然流体包裹体中甲烷水合物的生成条件。并由常温拉曼光谱分析表明,研究流体包裹体的流体组成为CH4-H2O体系。通过三种方法控制实验温度的变化,在第三种方法实验条件下获得了-170 ℃时甲烷水合物与冰的拉曼光谱,逐渐升温原位观测甲烷水合物的消失温度。原位拉曼光谱检测结果表明,研究包裹体中甲烷水合物的生成温度为7.5 ℃。结合CH4-H2O体系水合物形成条件相平衡计算,得到包裹体中甲烷水合物生成时的压力为5.587 3 MPa。研究结果表明,原位拉曼光谱技术是准确获取流体包裹体种气体水合物生成条件的一种有效方法。     

抢占型优先服务机制下多类排队网络的扩散逼近

证明一个满负荷交通极限定理以证实在抢占型优先服务机制下多类排队网络的扩散逼近,进而为该系统提供有效的随机动力学模型．所研究的排队网络典型地出现在现代通讯系统中高速集成服务分组数据网络,其中包含分组数据包的若干交通类型,每个类型涉及若干工作处理类（步骤）,并且属于同一交通类型的工作在可能接受服务的每一个网站被赋予相同的优先权等级,更进一步地,在整个网络中,属于不同交通类型的分组数据包之间无交互路由．     

川东北部飞仙关组气藏气体组分成因研究

川东北飞仙关组气藏为高含硫、过成熟常压（低压）的超干气藏,其地层在地质历史上经过了深埋藏和高温作用,具备了原油裂解的条件,包裹体资料证明原始气藏含有大量的高烃组分和液态沥青,且不含H₂S,确认气藏为原油裂解产物。气藏储层发育在膏盐岩中,原油裂解气与其中的硫酸盐矿物发生热化学还原作用（TSR）,消耗了大量的高烃气体,并产生大量H₂S和CO₂,所以现今气藏表现为高含硫和过成熟特征。硫酸盐岩热化学反应（TSR）生成的H₂S和CO₂大量溶解在水中,形成大量的酸,其产生的溶蚀作用极大地提高了储集空间,造成了现在气藏压力较低的特点。     

聚合物驱弹性效应对注入压力的影响

引人综合粘度度量聚合物溶液的粘弹性,利用无限大地层达西定律,导出了粘弹性流体径向流的压力损失方程。采用数值方法研究了粘弹性流体在变截面孔隙模型中的阻力特性,结合实例分析了粘弹性流体径向流的压力损失随粘弹性的变化规律。研究结果表明,弹性效应是影响注入压力升高的一个重要因素。聚合物溶液的粘弹性越大,其在地层孔隙中的渗流阻力越大,弹性效应在增高注入压力中所占的份额也越大。增加地层渗透率、降低注入排量、减小聚合物溶液的粘弹性均有利于降低注入压力,提高注入能力,改善注入效果。     

双官能团醇类化合物催化胺化反应的研究进展

本文综述了由双官能团醇类化合物催化胺化合成二元胺或环胺的研究进展,分别讨论了金属催化剂和固体酸催化剂对双官能团醇类化合物的不同作用机制,考察了反应物结构对 反应活性和选择性的影响,重点介绍了超临界氨流体在二元醇催化胺化反应中的应用,并指出了今后研究的方向.