Ni—Zn铁氧体微分磁化率曲线特征的研究

用匀速率增加的直流磁场Ｈ磁化不同居里温度的镍锌铁氧体试样，测得磁化强度Ｍ的时间变化率曲线表明：同一温度了随外场速率Ｈ增加，曲线升高；同一外场速率下随温度升高，曲线降低；微分磁化率ｄＭ／ｄＨ可以采用等效畴壁运动表示。     

碳酸二甲酯水解反应的研究

在催化剂存在下研究了温度和填充度对碳酸二甲酯水解反应的影响。结果表明；在一定的温度下，ＤＭＣ的水解速率随填充度的增加而下降；在一定的填充度下，ＤＭＣ的水解速率随反应温度的提高而增加，即使填充度增加至０．９，反应温度降低至１５０℃，ＤＭＣ的最终转化率仍可达到１００％。     

一维半导体在外场作用下的内势场数值解

利用Ｍａｔｌａｂ语言，用差分方法求解一维半导体在外场作用下的势垒变化，数值求解表明；外场减低势垒高度，外场不同，减低的高度一致，势垒基地高度随外场增加而增加。     

X70管线钢静态和动态韧性试验研究

在不同试验温度下，对X70管线钢缺口沿厚度方向的标准夏比V型缺口试样进行动态试验和静态试验，研究了X70管线钢的力学性能与加载速率的关系．通过对试验实测的载荷—位移曲线和破坏断口的分析，发现X70管线钢的韧性、试验曲线上最大载荷所对应的位移随试验温度降低而降低；同一试验温度下动态试验曲线上最大载荷所对应的位移小于静态试验曲线上最大载荷所对应的位移；加载速率对试样断面沿厚度方向收缩的影响与试验温度有关；无论是动态试验还是静态试验，试样断口均出现垂直于缺口方向的分层裂纹；试验温度对动态试验屈服载荷、最大载荷以及静态试验最大载荷的影响较小；随着试验温度升高，裂纹形成功和破坏总功均升高，加载速率对破坏总功的影响同样与试验温度有关．     

尼龙1010的拉伸屈服行为

研究尼龙１０１０在不同温度和拉伸速率下的拉伸屈服行为。在同一温度下，屈服应力，细颈扩展阶段的伸长倍数，应变硬化点的应变值，应硬化程度和二次成颈的应变随拉伸速率的增加近于线性增加；     

Ti45A18Nb2Mn0．2B铸造合金高温形变行为

Ti45A18Nb2Mn0．2B铸造合金在900～1200℃温度范围，1～10^-3／s应变速率条件下进行压缩实验，研究其变形特点以及组织变化．结果发现，形变过程中合金的真应力一真应变曲线上存在一个应力峰值，随后流变应力随着应变量的增加逐渐下降并趋于稳态流变．降低温度和提高应变～速率都使合金的应力峰值增加．在实验温度范围内合金的应变速率敏感系数为0．10～0．24；在高温形变过程中发生动态再结晶，合金的组织得到明显细化．再结晶晶粒尺寸随温度的降低和应变速率的增加而减小，也就是随Zener-Hollomonc参数的增加而减小；升高形变温度和降低应变速率均促进再结晶过程．     

温度对土壤水分性状的影响研究

温度对土壤的持水曲线产生明显的影响,在一定含水量条件下,随温度升高,土壤水基质势增加,而在同一基质势下土壤持水量随温度升高而降低,土壤水基质势温度系数(cm/℃)随土壤质地加重而增大,随含水量的增加而降低,并且与土壤水分变化特征(脱水或吸水)有关,脱水过程基质势温度系数大于吸水过程,低温段(5℃～20℃)大于高温段(20℃～50℃);土壤渗透系数随温度升高明显增大,且随质地加重,其温度效应增强;温度明显地影响土壤水的蒸发性能,随温度升高,土壤蒸发强度增大,蒸发第一阶段时间缩短,土壤前期蒸发增大,后期减弱,温度升高,土壤水分再分布速率增加,土体持水量减小。     

H~+在水和NaCl水溶液中的扩散行为

本文对 H~+在蒸馏水和不同浓度的 NaCl 水溶液中的扩散行为进行了实验研究。实验结果表明:同一温度下.H~+的扩散速率随 NaCl 水溶液浓度的升高而减小,在蒸馏水中最高:同一浓度下,H~+的扩散速率随温度的升高而增加;H~+在 NaCl 水溶液中的扩散激活能随浓度的升高而增大,在蒸馏水中最小,为3.89千卡/克分子.     

纤维增强HDPE／SBR热塑性弹性体流动性能的实验研究

研究纤维品种，用量，温度等因素对ＨＤＰＥ／ＳＢＲ热塑性弹性体流动性性能影响。结果表明；在同一ｒω下尼龙纤维增强热塑性弹性体ηα最大，比弹性体ηα提高近一个数量级。聚酯与玻璃纤维增强缠性体ηα则属中，随聚酯增强弹性体用量增加，ηα增大，随温度升高ηα下降，斜率增大，非牛顿性增强，表现出聚酯纤维对温度的敏感性玻璃纤维增强弹性体表现出对ｒω的敏感性。     

基于动态蠕变试验的沥青混合料黏弹性分析

基于沥青混合料Burgers模型的黏弹性理论,通过动态蠕变试验进行AC-20黏弹性分析,得到不同温度及应力下的混合料变形特征曲线及Burgers模型4个参数的变化规律.结果表明:在同一温度下,随应力水平增加,永久变形随之增大,稳定期永久应变发展速率增大且破坏期提前到来,Burgers模型参数中E1、E2增大,η1、η2减小;在同一应力水平下,永久变形会随温度升高而增大,同时E1、E2减小,η1、η2增大.因此应力及温度对沥青混合料黏性及弹性影响程度不同,随着应力增加,弹性增强而黏性降低;随温度升高,则弹性降低而黏性增加,该结论与路面实际使用状况一致.     

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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