玻尔兹曼常数测定实验测量范围研究

在0℃-70℃内不同温度条件下多次试验，研究在不同温度条件下测量范围的规律，建立了测量范围的经验公式，提出了在不同温度条件下测量范围的选择方法，     

温度对大理岩力学性质影响的细观研究

对不同温度下的大理岩进行单轴压缩试验,结果表明,经过高温后大理岩单轴抗压强度和弹性模量都大幅度降低,阈值温度在100℃左右.采用扫描电镜对各温度下大理岩断口进行扫描并对SEM图像进行了分析,对得到的不同温度下微裂隙的长度、方位角、间距等参数进行了统计分析,得到了细观结构几何参数在不同温度下的分布概型:长度在温度20~300℃时服从对数正态分布,450~600℃时服从Weibull分布;方位角在不同温度下服从正态分布;间距在温度20~300℃时服从对数正态分布,450~600℃时服从指数分布.     

温度对正负离子表面活性剂及其复配体系表面活性的影响

本文应用张力法测定了正负离子表面活性剂及其复配体系在不同温度下的表面张力，研究了各种体系的表面性质与温度的关系，并计算了在不同温度下的标准自由能变化．对不同体系的变化规律作了讨论．     

煤体渗透率随温度和应力变化的实验研究

针对温度、应力共同影响下的煤体甲烷渗透率变化规律仍然存在矛盾认识这一问题,采用实验和理论分析的方法,进行了不同温度、不同应力条件下的煤体甲烷渗流实验,分析了二者不同组合条件下的煤体渗透率变化机理。实验结果表明,渗透率随温度的升高呈现两种不同的变化规律,即在高应力条件下,渗透率随温度的升高而降低;在低应力条件下,煤体渗透率随温度的升高而升高。研究认为,温度与应力对渗透率有不同的影响机制,外围应力仅对煤孔隙有压缩效应,而在不同外围应力条件下,温度对煤基质具有外膨胀和内膨胀两种影响效应,进而使渗透率呈现不同的变化规律。这一发现对预测煤层气高渗区具有理论指导意义和应用价值。     

高温疲劳裂纹扩展规律的修正模型研究

对不同材料在高温下的疲劳裂纹扩展速率曲线进行了对比分析,采用Paris公式对不同材料在不同温度下的裂纹扩展速率曲线进行了拟合,得到了不同的材料常数C和n在不同温度下的值。研究发现,对于某种材料,在保持n不变的情况下,可以认为C在对数坐标下(即lg C)与温度T呈线性关系。据此,对Paris公式进行了修正,提出了一个包含温度项的针对不同材料在相应温度范围内的修正的高温疲劳裂纹扩展规律描述模型。利用该模型对不同材料在高温下的疲劳裂纹扩展规律进行了拟合和预测,发现拟合和预测效果较优,且由于模型形式简单,所需实验数据少,在工程中有一定的应用价值。     

线粒体热化学研究Ⅴ.鳙鱼肝脏线粒体代谢热动力学

用微量热法研究了不同温度下鳙鱼肝脏线粒体代谢的产热曲线,建立了热动力学方程,得到了线粒体在活性增长期的增长速率常数ｋ,平均比增长速率ｋ／ｍ等．实验结果表明,同一动物的同一器官线粒体,其不同温度下的产热曲线的形状相同,反映了线粒体的固有特征;不同温度下线粒体代谢各阶段的时间不同,其单位线粒体产热量亦不同     

竖向高度对超长结构温度效应的影响分析

研究了竖向高度对超长结构温度内力的影响.结合工程实例,采用线性分布法计算温度荷载,在最不利温度作用计算工况下,利用大型有限元分析软件计算不同竖向高度下的温度内力,得出不同竖向高度下结构中各构件(梁、楼板、柱子等)的温度内力变化规律.计算结果为工程设计和施工提供了参考.     

开关氧传感器的动态建模方法研究

在发动机实验台上,对废气氧(EGO)传感器进行了静、动态标定实验,并研究了EGO传感器在不同温度下的动态特性。根据不同方向和不同幅值激励下的传感器响应信号,建立了动态非线性Hammerstein模型;根据传感器延迟时间与温度的关系,得到了可通过温度校正延迟的Hammerstein模型。     

制备条件对镓掺杂氧化锌薄膜的透明导电性影响

用高温固相反应法制备了镓掺杂的氧化锌导电陶瓷,研究了预烧温度、烧结温度和掺杂浓度等工艺条件;用射频磁控溅射方法分别在玻璃和石英基底上沉积了镓掺杂的氧化锌薄膜,研究了该薄膜在不同的基底温度和不同的氧氩比等条件下的光电性质的变化情况以及氮气氛下不同退火温度下的光电性质,结果表明:镓掺杂氧化锌薄膜在450℃的基底温度、2%的掺杂浓度和700℃的退火温度等条件下实现了0.84×10-4Ω.cm的低电阻率和大于90%的可见光透过率,其光学带隙随退火温度的上升也有一定程度的增大.     

醋酸水溶液声速与温度浓度关系研究

研究了超声波在不同温度、不同浓度醋酸水溶液中的速度传播特性.应用脉冲回波法,检测了醋酸水溶液在16～70℃温度范围及体积分数为10%～75%范围的超声波传播速度,给出了不同浓度及不同温度下的速度与温度关系曲线,实验结果和理论推导基本一致.     

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

正~~