几种R12代用工质的热力学性质与理论制冷循环性能

对几种纯质和两个二元物系Ｒ２２／Ｒ１４２ｂ，Ｒ２２／Ｒ１５２ａ进行了以ＰＶＴｘ实验数据和改进型ＣＳＤ状态为基础的热力学性质计算和理论制冷循环分析。结果表明，Ｒ１２２／Ｒ１４２ｂ为近理想溶液，Ｒ２２／Ｒ１５２ａ为近共沸溶液，纯质及Ｒ２２／Ｒ１４２ｂ物系的理论制冷循环性能与Ｒ１２相比互有优缺，而Ｒ２２／Ｒ１５２ａ物系的主要性能指标超出Ｒ１２。     

杭州临安乾龙电器有限公司

杭州富时特化工有限公司成立于１９９６年,它是由浙江省化工研究院、香港雄平有限公司和萧山第二化工塑料厂共同出资组建的有限责任公司。主要生产经营国家专利产品ＨＣＦＣ－１４１ｂ／１４２ｂ和ＨＦＣ－１５２ａ等制冷剂、气雾推进剂、聚氨酯发泡剂、电子材料清洗剂,现已达到１００００吨／年ＨＣＦＣ－１４１ｂ／１４２ｂ和２０００吨／年ＨＦＣ－１５２ａ生产能力。其中１００００吨／年ＨＣＦＣ－１４１ｂ／１４２ｂ已列入国家科技部科技创新基金项目,ＨＦＣ－１５２ａ项目１９９９年被评为国家石油化学工业局科技进步二等奖,２０…     

反应热对钛铁矿铝热还原的影响

研究了反应热对钛铁矿铝热还原过程的影响，不同反应热对钛的矿铝热还原反应产物钛铁与钛收率的影响及渣的形貌分析结果表明，当反应热的绝对值│ΔＨ│〈２５８３．２４ＫＪ／Ｋｇ时，钛铁与钛收率随│ΔＨ│的增加而增大，钛铁中的铝含量则降低；当│ΔＨ│〉２５．８３．２ＫＪ／Ｋｇ时，钛铁与钛收率随│ΔＨ│的增加减少，铝含量则增大，因此钛铁矿铝热还原反应的反应热应严格控制在０－２５８４．２４ＫＪ／Ｋｇ。     

HFC-32/HFC-134a和HCFC-22在水平管内的强制对流沸腾换热特性

进行了非共沸混合制冷剂ＨＦＣΑ３２／ＨＦＣΑ１３４ａ和纯制冷剂ＨＣＦＣΑ２２在水平管内的强制对流沸腾换热实验．ＨＦＣΑ３２的质量分数为０．１０、０．２５和０．４０，热流密度为６、１２、１８、２４、３６、４８和６０ｋＷ／ｍ２，质量流量为１０、１５、２２、３０和４６ｇ／ｓ，实验段进口压力保持为０．４ＭＰａ．实验结果表明在质量流量大于２２ｇ／ｓ时，ＨＦＣΑ３２／ＨＦＣΑ１３４ａ的换热系数与ＨＣＦＣΑ２２相当．实验对混合制冷剂的强制对流蒸发换热退化、核态沸腾抑制和环状流周向壁温分布等现象进行了分析．采用Ｊｕｎｇ关系式的预测值与本文实验结果比较，吻合较好     

meso-四-(4-甲氧基苯基)卟啉的晶体和分子结构

用Ｘ—射线测定了ｍｅｓｏ－四（４－甲氧基苯基）卟啉的溶剂合物（ＴＰＭＰ·ＣＨＣｌ３）的晶体结构。实验表明，该晶体属单斜晶系，空间群Ｐ２１／Ｃ，ａ＝１．４３７７（２）ｎｍ，ｂ＝０．９６７４（７）ｎｍ，ｃ＝１．５６８８（４）ｎｍ，β＝１０１．００（２）°，Ｖ＝２．１４２ｎｍ３，Ｚ＝２，ｄｃ＝１．３２４ｇ／ｃｍ３，μ＝２．６１３ｃｍ－１，Ｆ（０００）＝４４４。讨论了分子结构中的非平面共轭效应及卟啉环与锰（Ⅲ）离子配位后锰（Ⅲ）对其结构参数的影响。     

2′－6′－二乙胺基萤烷的合成及晶体结构研究

利用Ｘ－射线衍射分析测定了标题化合物的晶体结构．Ｃ２４Ｈ２０ＮＯ３Ｃｌ属单斜晶系，空间群Ｐ２１／ｎ，Ｍｒ＝４０５．８８，ａ＝１１．６２５（３），ｂ＝１３．８４４（３），ｃ＝２２．６４３（４）×１０－１０ｍ，β＝９４．８０（２）°，Ｖ＝２０１５．（１）×１０－３０ｍ３，Ｚ＝４，Ｆ（０００）＝８４８，Ｄｃ＝１．３３ｇ／ｃｍ３，Ｒ＝０．０８４和Ｒｗ＝０．０９６．含有氧的六圆环为半椅式构象，五圆环和它相邻的苯环几乎共面．Ｃ（１４）与Ｏ（１），Ｃ（２１）与Ｏ（１）为典型的Ｓｐ２－Ｓｐ２键，使相邻两个苯环之间产生了共轭     

低KH高铁硅酸盐水泥部分性能的研究

对掺复合矿化剂ＣａＦ２＋ＣａＳＯ４／ＢａＳＯ４的低ＫＨ（＜０．８７）高铁水泥及低ＫＨ高铝水泥的某些性能进行实验室研究。     

关于无爪图中（u,v）—5路存在性的两个定理

证明了下列结果：（１）设Ｇ是３连通无爪图,│Ｖ（Ｇ）│≥６且Ｇ的每个导出图Ａ都满足φ（ａ１,ａ２）那么对任意ｕ,ｖ∈Ｖ（Ｇ）,若２≤ｄ（ｕ,ｖ）≤５,则对满足ｄ（ｕ,ｖ）≤ｋ≤５的整数ｋ,Ｇ中存在（ｕ,ｖ）－ｋ路（２）设Ｇ是３连通无爪图,│Ｖ（Ｇ）│≥６,且Ｇ的每个导出子图Ａ都满足φ（ａ１,ａ２）而Ｐ＝ｖ１,ｖ２,．．．ｖ５（ｖ１＝ｕ,ｖ５＝ｖ）是Ｇ的（ｕ,ｖ）－４路Ｇ（Ｖ（Ｐ）＝Ｋ│ｖ（ｐ）│则     

凸度量空间上的一个不动点定理

设Ｘ为具有性质（Ｃ）和（Ｐ）的凸度量空间，Ｋ是Ｘ的非空凸子集，ＴＫ→２Ｘ使得ｘ→ｄ（ｘ，Ｔｘ）是１．ｓ．ｃ．若ｉｎｆ｛ｄ（ｘ，Ｔｘ）｜ｘ∈Ｋ｝＝０，且ｘ，ｙ∈Ｋ，λ∈［０，１］，ｕ＝Ｗ（ｘ，ｙ，λ）有ｄ（ｕ，Ｔｕ）≤Φ（ｍａｘ｛ｄ（ｘ，Ｔｘ），ｄ（ｙ，Ｔｙ）｝）．这里ΦＲ＋→Ｒ＋满足条件Φ（０）＝０，在０的右边不减和连续，则Ｔ在Ｋ上有不动点．它推广了Ｔ．Ｈ．Ｃｈａｎｇ和Ｃ．Ｌ．Ｙｅｎ（１９８９）在Ｂａｎａｃｈ空间中的结果     

氢传感法测定熔融铝中氢含量的研究

采用固相合成法直接合成ＣａＺｒ０．９Ｉｎ０．１Ｏ３－ａ用交流阻抗谱技术，在８６９～１３００Ｋ温度范围内，空气气氛下测得其电导率为１０＾－４～１０＾－２ｓ．ｃｍ＾－１制得ＣａＺｒ０．９Ｉｎ０．１Ｏ３－ａ固体电解质管，以含Ｈ２的标准气为参比电极，组装成氢浓差电池。Ｆｅ含Ｈ２标准气│ＣａＺｒ０．９Ｉｎ０．１Ｏ３－ａ│（Ｈ）ＡｌＦｅ并构成氢传感探头，研究其对熔融铝中氢含量的传感特性，实验证明，该传感器响应     

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.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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