含掺合料因素的混凝土强度公式及其应用

本文阐述混凝土灰水比强度公式可用于混凝土的配比设计，由目标强度推算出主要的配比参数，也可用于预测，由混凝土的组成和配比，预测其28d强度。     

一类不确定系统的鲁棒左扇形稳定性

对于一类特征多项式由单形多项式族描述的不确定系统，其左扇形稳定性可由一个非常简单的判据加以检验，对于低阶系统，这一判据还可进一步简化。     

一个新的Lie代数及其应用

对已知Lie代数An.1推广得到一类新的Lie代数，由其相应的Loop代数及屠格式，获得一类新的可积Hamilton方程族。建立一个5维的loop代数，由可积耦合定义，得到所求方程族的一类扩展可积模型。     

我国研制6千米深海机器手 可排险和驾驶飞船

可在6000米深海环境下工作的“水下机器手”由我国科学家首次研制成功。专家介绍，作为由中国科学院合肥智能机械研究所智能机器人传感器实验室承担的”863”项目，该系统不仅可用于深海作业型机器人，也可用于特种部队的排险机器人、空军无人驾驶飞机以及无人驾驶飞船中机器人自动或遥控驾驶和操作，还可辐射到其他相关领域，推广前景广阔。     

n阶全矩阵环（代数）的极小生成集

证明了下面的结论：１．若Ｒ是有单元元１的环，则Ｍｎ（Ｒ）作为环与Ｒ－模可由两个元生成；２．设Ｆ是域，Ｍｎ（Ｆ）作为Ｆ－代数可由两个元生成，且Ｍｎ（Ｆ）的任意非中心元皆可作为极小生成集中的一员；３．设Ｆ是特征为零的域，则Ｍｎ（Ｆ）的上三角矩阵子代数可由两个元生成。     

数据库工具软件的开发

本文介绍数据库工具(DBFTOOLS)软件的设计思想和实现方法。在DBMS下建立的数据库，可在DOS下通过DBFTOOLS进行查询、统计、作图等操作。同时，由DBFTOOLS提供的一些功能函数，也可由用户程序独立调用。     

试析英语词素

词素是最低限度的语义单位，可分为自由词素和词根等类型，可由一组词素变体来构成     

研究人员发明“耳控”开关

3月10日．日本大阪大学研究人员展示了一种可由耳朵控制开关的装置。 这种装置由红外线发光器和光感应器组成，可感应人体耳朵内部的细微变化，根据鼓膜之间的距离变化而改变信号，进而操控开关。     

基于SPCE061A的路灯控制系统

系统以十六位SPCE061A单片机为控制核心，采用激光技术实现了对移动物体检测，经单片机编程处理，可实时控制各个路灯按时开关，并能方便的设定路灯的开关时间。自动状态时可根据环境明暗变化开灯和关灯。路灯采用多个高亮度LED组成，其电源通过开关型稳压块稳压由MOS管驱动，并由单片机输出的PWM波控制LED路灯的调光。与上位机可通过RS232串口通信，实现了数据的上传和保存。由LCD实时显示当前时间和环境温度。     

日光灯会引起火灾吗？

尽管日光灯的灯管温度不高，可实际上由日光灯引起的火灾也时有发生，这是何故呢？问题不在灯管，而是由日光灯的镇流器引起的。     

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