叠置电厂热力系统局部定量分析理论的研究

基于等效热降理论，针对叠置机组热力系统的特殊性，提出了叠置电厂中压机组的功量指标转换系数ξ和热量指标转换系数ψ，利用这２个转换系数能简捷、快速地定量分析叠置机组热力系统变化对机组的经济指标的影响，进而得出了叠置电厂热力系统局部定量分析的数学模型．该模型的概念清晰、结果准确、计算方法与中压机组类型无关，并通过实例验证了定量分析模型的正确性和可行性，从而形成了叠置机组的热力系统的局部定量方法．     

Quantitative Analysis of Partial Alteration of Repower Plant Thermal System

基于等效热降理论，针对叠置机组热力系统的特殊性，提出了叠置电厂中压机组的功量指标转换系数ξ和热量指标转换系数ψ，利用这2个转换系数能简捷、快速地定量分析叠置机组热力系统变化对机组的经济指标的影响，进而得出了叠置电厂热力系统局部定量分析的数学模型．该模型的概念清晰、结果准确、计算方法与中压机组类型无关，并通过实例验证了定量分析模型的正确性和可行性，从而形成了叠置机组的热力系统的局部定量方法．     

压水堆核电机组二回路定量分析方法的研究

针对压水堆核电机组采用新蒸汽再热的特点,利用压水堆二回路加热器抽汽效率的概念,提出了带工质热量进出热力系统的定理分析方法,建立了压水堆二回路热力系统的经济性定量分析数学模型,得出了一套概念清晰、计算简捷的压水堆核电机组二回路路的定量分析方法,为优化设计、经济运行、经济性诊断提供了有力的工具。通过实例计算,验证了所提理论模型的准确和通用性。     

火电厂热力系统定量分析通用模型

在等效热降理论的基础上，提出了２个新的分析参量－－抽汽热流与抽汽热流系数，使得实际循环内功和循环吸热量的计算公式具有同一形式，且公式的物理意义明确，并由此导得热力系统定量分析的通用模型，其分析方法及导出的通用模型，可方便地应用于热力系统的节能潜力诊断与优化分析。     

供热机组辅助系统多重循环理论的改进

本文主要是对供热机组多重循环理论进行了改进和完善。通过对供热机组热系统的深入剖析，提出了以抽汽影响率为核心的扰动对热负荷影响的计算方法，并利用能量平衡法，推导出抽汽排汽系数的计算通式。并应用其构建了供热机组辅助系统热经济性分析模型，最终使该理论成为分析供热机组热经济性的较为完整的方法体系。     

简议电厂热力系统太阳能的原理及应用

分析了利用太阳能产生的蒸汽代替火电厂热力系统中的某低级压抽汽来提高机组热经济性的方案,并分别计算了600MW、300MW、200MW机组热经济指标的变化。计算表明：额定工况下利用太阳能后机组发电标准煤耗率均可降低7g／（KW．H）以上,汽耗率降低一上,节能效果显著。对热效率低的机组,一般利用太阳能降低发电标准煤耗的潜力更大。     

机组热经济性分析

利用等效热降局部定量分析方法 ,计算、分析和比较了两台同类型机组的热经济性 ,结果认为 ,相同因素对同类型机组热经济性的影响是类似的 ,因此单台机组的分析结论可应用于同类型的机组 .给出了对经济性影响比较大的因素 ,可为进一步提高机组经济性、降低煤耗提供理论依据     

论分析热力系统的等效热降法

“等效热降”法是考虑热力系统实际结构而发展起来的一种新的热力系统计算方法,用它对热力系统进行全面定量分析或局部定量分析都属便捷,且是火电厂最佳控制和经济管理的有力工具之一。本文评述现有分析热力系统的各种方法,特别是叙述“等效热降”法的理论及其应用特色。     

1000MW超超临界机组等效热降计算

以某1000 MW超超临界机组的THA工况为基础,进行等效热降计算。计算结果和该机组THA工况的热力平衡图相比,热耗率误差为0.0875%。通过对该机组的等效热降计算,可以为以后定量分析其他同类型机组的节能改造措施提供参考。     

1000 MW超超临界机组等效热降计算简

以某1000 MW超超临界机组的THA工况为基础,进行等效热降计算.计算结果和该机组THA工况的热力平衡图相比,热耗率误差为0.0875％.通过对该该组的等效热降计算,可以为以后定量分析其他同类型机组的节能改造措施提供参考.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has