制冷工质HFC-134a热物理性质参数计算

分析了制冷工质HFC-134a的粘性、导热性和表面张力的热物理性质参数方程不同计算方法，经对比选出了较为精确的一组参数方程．经验证，在一般制冷空调工程的实用工作温度和压力范围内，该组参数方程有良好的计算精度，可应用于工程设计．     

氟里昂族三种制冷剂的热物性分析

建立了制冷剂的４个热力学基本方程，提出了热物性状态参数的求解方法，编制了ＮＡＴＰ程序，计算了氟里昂族３种制冷剂的热物性参数，结果与实测值吻合得很好。     

氟里昂族三种制冷剂的热物性分析

建立了制冷剂的４个热力学基本方程，提出了热物性状态参数的求解方法，编制了ＮＡＴＰ程序，计算了氟里昂族３种制冷剂的热物性参数，结果与实测值吻合得很好．     

卫星太阳能电池板热设计参数的灵敏度分析

由于卫星在生产和运行中一些不确定因素的影响,卫星热设计参数难以精确确定．从而影响卫星热设计的结果。该文利用系统灵敏度理论,对卫星热设计问题进行了分析,导出了卫星热设计系统的灵敏度方程,并以太阳能电池板的热设计为例,对系统的灵敏度方程进行了求解,分析了各参数的灵敏度,为太阳能电池板热设计中结构及物性参数的确定提供了依据,为太阳能电池板热设计的可靠性验证以及卫星运行可靠性提供了分析方法。将参数分析方法应用于卫星的热设计和热分析中,可提高卫星热设计和热分析的效率。     

利君沙热分解动力学的研究

利用热重分析在氮气气氛下对药物利君沙的热失重行为进行了研究.运用四种不同的动力学方程即Coats-Redfern法、Madhusudhanan-Krishnan-Ninan(MKN)法、Kissinger法和Doyle法求算出利君沙第二步热分解反应的动力学参数.结果表明:利君沙第二步热分解反应为一级反应过程,其表观活化能为174.3±7.74kJ·mol-1,频率因子lnA为35.25s-1.     

石油焦热解动力学参数及其补偿效应

通过对石油焦热解的热重分析，发现石油焦热解动力学参数爱升温速率、热解率等实验条件影响较大，并归纳出石油焦热的动力学补偿效应表达式ｌｎＡ＝ａ＋ｂＥ，从而建立石油焦热解动力学参数之间的关系。     

减压渣油热转化行为的热重法研究

用热重分析法研究了减压渣油的热转化行为，获得了渣油热转化的起始失重温度、转化终了温度、剧烈反应温度区间、反应速率峰值及峰值温度、生焦率、不同转化阶段的温度区间及对应的动力学参数和动力学方程．该方法具有简便易行，样品用量少，取得参数多，获得信息快等优点，可用于评价不同产区和不同产期的渣油及渣油中的组分在不同条件下的热转化行为     

减压渣油热转化行为的热重法研究

用热重分析法研究了减压渣油的热转化行为，获得了渣油热转化的起始失重温度、转化终了温度、剧烈反应温度区间、反应速率峰值及峰值温度、生焦率、不同转化阶段的温度区间及对应的动力学参数和动力学方程。该方法具有简便易行，样品用量少，取得参数多，获得信息快等优点，可用于评价不同产区和不同产期的渣油及渣油中的组分在不同条件下的热转化行为。     

热动力学无量纲参数法基本公式的研究

本文以热动力学的基本理论方程式为基础，由热谱曲线方程来建立与邓氏无量纲参数法有着内在联系的、具有明确动力学意义的无量纲参数倍。     

几种生物质热重曲线的分析

试验研究检测了玉米秸秆，小麦秸秆的热解特性．并对几种生物质的热解过程进行了分析．差热曲线的计算分析表明，生物质热解反应是一个一级反应过程，据此获得了生物质的动力学参数——频率因子和活化能，最后得到生物质的热解动力学方程．     

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