一类灰参数模型识别及其在水文预报中的应用

探讨了水文系统和输入存在不确定性的灰色系统分析问题，基于输出观测的灰区间信息，提出了一类显式的灰参数模型识别方法，通过灰参数分析，获得了反映系统不确定度，过程模拟合格率精确性之间的量化关系，通过对黄河流域龙山峡水库月径流的预报分析与检验说明了这类方法的意义与实用性。     

利用高压静电技术改进旋风除尘器性能的研究

常规的旋风除尘器结构紧凑简单、投资省，适用于捕集锅炉排烟中粒径为5－10μm以上的灰粒。在旋风除尘器结构基础上附加高压静电场的作用，可进一步提高除尘效率，特别是提高微米和亚微米灰粒的捕集效率。通过建立实验系统和模型，进行了利用高压静电技术改进旋风除尘器性能的实验研究，并对影响除尘性能的参数，如除尘器进口风速、工作电压等进行了系统的探讨与分析，初步掌握了实验模型的最佳运行工况。     

贵州普定后寨岩溶地下水系统灰色预测模型研究

运用系统理论观点,分析了贵州普定后寨岩溶地下水系统基本特征,在此基础上建立了岩溶地下水系统灰色预测模型,并取得了较好的预报结果。此外,还对模型灰参数的物理意义进行了简单讨论,认为灰参数反映了岩溶地下水系统特征,加深了对系统了解。     

电厂水力输灰管内灰浆流动特性的研究

远距离、大流量水力输灰管路的增多，使电力部门对输灰系统的设计和运行提出了新要求．通过对输灰管内灰浆流动特性曲线的分析，引入了流区判别因子Ｚ，从而为灰管设计及运行流速的选取提供了新依据；并通过试验，筛选出了较为合理的灰管流阻力降计算公式．     

电厂水力输达管内灰浆流动特性的研究

远距离，大流量水力输达管路的增多，使电力部门对输灰系统的设计和运行提出了新要求，通过对输灰管内灰浆流动特性曲线的分析，引入了流区判别因子Ｚ，从而为灰管设计及运行流速的选取提供了新依据，并通过试验，筛选出了较为合理的灰管流阻力降计算公式。     

循环流化床整体物料平衡通用动态数学模型

建立了考虑排渣、飞灰、排循环灰以及物料磨耗等一般情形的循环流化床宽筛分物料平衡动态数学模型，模型通用性强而且符合实际运行情况。通过对改变料位设定值以及突然排放循环灰两种动态过程的仿真，揭示了排渣量，排循环灰量等操作参数与流化床主要运行参数间的作用关系，证明所建模型能够反映流化床内部的复杂作用关系。它为建立循环流化床整体动态数学模型，研究流化床控制策略，乃至仿真培训器的开发打下了基础。     

某火电厂灰渣泵水击现象浅析

本文分析了某电厂输灰系统布置特点,针对除灰泵遇紧急状况停止运转时倒流灰浆对泵体产生的破坏现象进行分析,对灰渣泵水击现象进行模拟分析与计算,校核泵壳强度,并对其飞逸转速进行计算。通过理论分析与实际计算相结合,对该电厂输灰系统装置提出了改进措施。     

熟料微细化对结构及性能的影响

研究水泥熟料超细粉磨后的结构和性能变化，以及对掺加一定量超细矿渣和硅灰后水化系统的性能影响。测定了水泥浆体的物理力学性能，应用DTA，SEM，XRD分析了不同龄期硬化水泥浆体中水化产物及其微观结构，利用压汞测孔仪测定了硬化水泥浆体的孔结构参数。结果分析认为：水泥熟料超细粉磨后，二水石膏已难以控制其凝结速度；系统中加入一定量的超细矿渣和硅灰后，硬化水泥浆体与骨料的界面层富集结晶Ca(OH)2的现象消失，硬化水泥浆体的孔分布更加均匀细微。     

离心机参数择优的多目标灰色局势决策

离心机的各项工艺指标与其参数间的关系是一个含有灰关系和灰因素的灰色系统。本文根据灰色系统理论,采用多目标灰色局势决策的方法,对离心机参数的优化作了新的尝试。     

水泥基复合胶凝材料流变性能

为了获得高性能混凝土内胶凝材料的优化配方，制备并测试了一系列试样。对试样的研究采用了均匀设计安排试验点，利用流变学原理，从流变参数、触变性、经时变化三个方面，对水泥基复合胶凝材料的工作性进行了研究。通过分析、比较找到了粉煤灰与矿渣、粉煤灰与硅灰以及矿渣与硅灰复合作为外掺料组成水泥基复合胶凝材料的优化配方，为高性能混凝土的配制打下了良好的基础。     

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

正~~     

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