毛细管压力、饱和度和相界面积间的关系

多相流体在多孔介质中流动时,传质扩散、非水相溶解等现象都与相间界面有关,利用孔隙级网络模型定量表征每一个孔隙孔喉中流体分布,结合几何知识,计算得到了多相流体在孑L隙级网络模型中流动时的毛细管压力、饱和度和相间界面积,并作出了它们之间的关系曲线.计算结果表明,毛细管压力、饱和度和界面积之间存在着比较明显的相互制约关系.这一关系为研究与界面有关的非水相溶解、界面间的传质等现象奠定了基础.     

毛细管压力、饱和度和相界面积间的关系

多相流体在多孔介质中流动时,传质扩散、非水相溶解等现象都与相间界面有关,利用孔隙级网络模型定量表征每一个孔隙孔喉中流体分布,结合几何知识,计算得到了多相流体在孑L隙级网络模型中流动时的毛细管压力、饱和度和相间界面积,并作出了它们之间的关系曲线.计算结果表明,毛细管压力、饱和度和界面积之间存在着比较明显的相互制约关系.这一关系为研究与界面有关的非水相溶解、界面间的传质等现象奠定了基础.     

搅拌槽内多相流动数值模拟研究进展

综述了过程工业中广泛应用的搅拌槽反应器内多相流动数值模拟研究的进展.讨论多相湍流模型、相间作用力模型及搅拌桨处理方法等重要的数值模拟技术和方法,并对有关的计算模型进行了比较分析.针对搅拌槽内的各种多相体系,论述了不同研究者在桨区处理、相间动量传递描述和分散相的引入对体系湍流特性影响等方面的模拟方法并对结果作了比较.提出了需要进一步深入研究的课题.     

水平管气液分层流压力梯度和含气率计算方法研究

在内径为80mm的大型多相流实验环道上，深入研究了高气相流速下气液分层流压力梯度和截面含气率特性，截面含气率采用双能伽马射线密度仅测量．通过对相间剪切应力的研究，提出应用气相动量方程计算压力梯度和界面含气率．采用FLAT、ARS、MARS 3种界面形状模型计算了水平管气液两相分层流压力梯度和截面含气率，并将计算结果与实验结果进行了对比分析,ARS和MARS模型的预测结果接近且误差小，因此推荐采用ARS或MARS模型预测高气相流速分层流压力梯度和截面含气率．     

高温冶金多相复杂体系综合平衡计算

本文提出了一种高温冶金多相体系综合平衡计算的计算机方法。从数学上阐述了方法原理,并展示了程序框图。文中给出了一个关于铜熔炼过程的计算实例。     

低液量水平管气液两相分层流压力梯度和持液率研究

低液量气液两相分层流是长距离凝析天然气管线中一种常见流型,文章在大型多相流实验环道上进行了气液两相分层流实验,以动量平衡方程为流动机理分析基础,根据低液量气液两相流动特征,选取双圆环作为界面几何模型;优选气液相间摩擦系数,使低液量气液两相分层流压力梯度计算关系式闭合,计算了低液量分层流的压力梯度和持液率,并将模型预测值与实验实测数据进行了比较分析。在整个实验数据范围内,双圆环界面模型能够很好地预测低液量条件下气液两相分层流的压力梯度和持液率,因此建议在低液量的气液两相分层流中推荐采用双圆环界面模型预测压力梯度和持液率。     

汽液两相流中的声速研究

导出了汽液两相流系统中的波数Ｋ方程。假设在特定的空泡份额下发生流型转化，分别采用不同的表达式计算泡状流及环状流区域相间界面面积及界面摩擦切应力，并提出计算弹状流区域相间界面面积及界面摩擦切应力的经验方法，通过解傅里叶边界层导热主获得界面热负。作者们编制了计算程序，在压力Ｐ＝０．０７～１６．０ＭＰａ，空泡份额ａ＝０～１．０，角频率ｗ＝１～１０＾８Ｈｚ的参数范围内进行了计算。将低压声速ａ的部分计算结果     

多相介质层状材料中围道^J积分守恒性的研究

通过证明得到了多相介质层状材料中的任意一种均质材料的回路^J积分等于零;证明了在多相介质层状材料的界面上裂纹,以及平行界面的裂纹尖端的围道^J积分是守恒的,为^J积分表征多相材料的断裂韧性提供了理论依据.     

多相介质层状材料中围道“非汉字符号”积分守恒性的研究

通过证明得到了多相介质层状材料中的任意一种均质材料的回路 J∧ 积分等于零 ;证明了在多相介质层状材料的界面上裂纹 ,以及平行界面的裂纹尖端的围道 J∧ 积分是守恒的 ,为 J∧积分表征多相材料的断裂韧性提供了理论依据     

空间自适应的快速粒子Level Set方法

Level set作为一种有效的界面追踪方法,已经被广泛地应用到单相流的自由表面追踪或多相流的交界面追踪.快速粒子level set方法(FPLS)是一种改进的level set方法,既具有较高的界面追踪精度,又有较高的计算效率.将其与自适应网格结合起来,提出了一种基于树型结构空间自适应的快速粒子level set方法(SA-FPLS).通过在交界面附近设置高分辨率网格带,且只在高分辨率网格带内求解level set方程,既进一步提高了交界面模拟精度,又可以节省计算机内存,同时保持较高计算效率.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that