聚苯乙烯—乙酸正丁酯系统的恒温汽液平衡

用静态吸收－石英弹簧称重法，测定了２９８．１５Ｋ时乙酸正丁酯与三种不同摩尔质量的单分散聚苯乙烯系统的汽液平衡。结果表明，在实验误差范围内，以相对蒸汽压Ｐ１／Ｐ１°对液相质量分数ｗ１作图，所得汽液平衡曲线与聚合物的摩尔质量无关。Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数Ｘ主要依赖于溶液深度，聚合物摩尔质量也有轻微影响。用修正的Ｆｒｅｅｄ模型关联实验数据，取得了满意的结果。     

H2O—DMF—HCOOH体系汽液相平衡研究

在常压下测定了 Ｈ２Ｏ－ＤＭＦ－ＨＣＯＯＨ体系的汽液平衡数据并进行了热 力学关联计算，测定了三组二元体系和一组三元体系的汽液相平衡数据。用 Ｗｉｌｓｏｎ方程和缔合模型进行了热力学关联，求得Ｈ２Ｏ，ＤＭＦ，ＨＣＯＯＨ之间 的 Ｗｉｌｓｏｎ方程配偶参数。由二元配偶参数推算了 Ｈ２Ｏ－ＤＭＦ－ＨＣＯＯＨ三元体 系汽液相平衡数据，并与实验数据进行比较；其结果令人满意。     

水-甲基丙烯酸甲酯-甲基丙烯酸三元系汽液平衡的研究

本文报道了在26.66kPa下,水-甲基丙烯酸甲酯(MMA)、水-甲基丙烯酸(MAA)两对二元系以及水-MMA-MAA三元系的汽液平衡和液液汽平衡实验数据。在校正了MAA的汽相缔合后,用UNIQUAC方程进行关联,用拟合所得二元参数推算了三元汽液平衡、液液汽平衡的数据,计算值与实验值良地好一致。     

UNIFAC基团贡献法预测新疆直馏油汽液平衡

在实测新疆原油小于３５０℃馏分油常压和大于３５０℃重油减压不同条件下的汽液平衡数据基础上，探索将正构烷烃模型分子法与ＵＮＩＦＡＣ基团贡献法相结合，按三种相平衡常数模型，预测新疆原油直馏油汽液平衡．通过对泡、露点温度与平衡闪蒸温度的考察，证实了该法的可行性，计算准确性能满足工程实用要求     

UNIFAC基团贡献法预测新疆直馏油汽液平衡

在实测新疆原油小于３５０℃馏分油常压和大于３５０℃重油减压不同条件下的汽液平衡数据基础上，探索将正构烷烃模型分子法与ＵＮＩＦＡＣ基团贡献法相结合，按三种相平衡常数模型，预测新疆原油直馏油汽液平衡。通过对泡、露点温度与平衡闪蒸温度的考察，证实了该法的可行性，计算准确性能满足工程实用要求。     

辽河原油直馏油常减压汽液平衡的实验研究与并联

利用自建的流动型汽－液平衡装置，分别测定了辽河原油直馏油在常减压不同压力和温度下共１５套汽－液平衡数据，按假多元系法处理获得２２０组相平衡常数，在此基础上提出了计算假组分相平衡常数的５个经验关联式并进行了泡，露点温度预测，这些关联式所用物性参数少，易于获得，可供工程实际应用，此外还就实测ＥＦＶ曲线与用ＡＰＩ推荐方法转换的相同压力下的ＥＦＶ曲线作了比较。     

辽河原油直馏油常减压汽液平衡的实验研究与关联

利用自建的流动型汽－液平衡装置，分别测定了辽河原油直馏油在常减压不同压力和温度下共１５套汽－液平衡数据。按假多元系法处理获得２２０组相平衡常数。在此基础上提出了计算假组分相平衡常数的５个经验关联式并进行了泡、露点温度预测。这些关联式所用物性参数少，易于获得，可供工程实际应用。此外还就实测ＥＦＶ曲线与用ＡＰＩ推荐方法转换的相同压力下的ＥＦＶ曲线作了比较。     

丙酮－PMMA及乙酸乙酯－PMMA系统汽液平衡研究

采用石英弹簧重量法，对三种不同相对分子质量的ＰＭＭＡ单分散样品，测定了３５℃下丙酮－ＰＭＭＡ、乙酸乙酯－ＰＭＭＡ系统的汽液平衡数据。分析了Ｆｌｏｒｙ－Ｈｕｇｇｉｎｓ相互作用参数χ与溶液组成及样品相对分子质量的关系。用Ｅｌｂｒｏ－ＦＶ模型预测了溶剂活度系数，并与实验结果进行了比较。     

氮－烃类二元低温混合工质的工作机理分析

用ＰＲ方程计算氮－烃类二元混合物的自由焓，提出判别氨－烃类二元混合物互溶性的方法，并计算了该类混合工质的汽液平衡、液液平衡和汽液液平衡特性，为寻求新的混合工质对提供了一种有效的理论预测方法。     

汽液双循环相平衡测定装置

建立了一套汽液双循环相平衡实验测定装置，并采用了磁力循环泵循环汽液两相流体、六通阀在线取样分析样品。装置具有平衡时间短、对测定体系和条件适应性广的特点。用已知体系的汽液平衡数据验证了装置的可靠性。并测定了正戊烷-苯体系30℃和55℃的等温汽液相平衡数据，用Wilson和NRTL活度系数方程对测定的汽液相平衡数据进行了关联，Wilson方程的汽相组成平均误差为0．0065，NRTL方程的平均误差为0.0073。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the