循环压缩—4闰伸载荷下矩形板的极限强度

采用弹性大变形分析以及塑性分析相结合的方法讨论了循环压缩－拉伸载荷下长矩形板的非弹性载荷－变形性能。重点是探讨循环面内载荷下薄矩形板在后屈曲内的滞回特性。分析表明，板的面内压缩刚度和承载能力将随循环次数的增加而不断降低。     

循环面内压缩载荷下方板的非弹性变形性能

介绍了循环面内压缩载荷下方板非弹性变形性能的理论与试验工作．采用箱形焊接方柱进行试验，重点研究不同初始挠度对板构件循环变形性能的影响．给出了循环加载与单调加载载荷－变形性能的比较．     

循环面内压缩载荷下方板的非弹性变形性能

介绍了循环面内压缩载荷下方板非弹性变形性能的理论与试验工作，采用箱开接方柱进行试验重点研究不同初挠度对板构件循环变性能的影响。给出了循环加载与单调加载载荷－变形性能的比较。     

预静载荷作用矩形板的冲击屈曲

分析了受面内静载荷作用的弹性矩形板在随时间线性增长的冲击载荷作用下的冲击屈曲，分析了静载荷，冲击载荷速度及初始挠度对板临界冲击载荷和冲击后屈曲特性的影响。     

面内循环压缩载荷下船体平板的剩余极限强度

通过对受压薄板进行弹性大挠度理论与刚塑性极限分析,提出了对面内压缩循环下基于塑性累积变形的船体平板剩余极限强度的简化分析方法,区分了面内压缩循环历程所包括的加载、塑性流动与卸载等三个典型阶段.经过与已有实验结果进行对比,表明简化方法的结果能更好地符合实验结果.最后,运用简化方法与非线性有限元分析了一块实船船体板面内循环压缩载荷下的剩余极限强度,所得结果一致.     

大挠度矩形板的强非线性振动分析

分析了大挠度矩形板在横向周期激励和面内静载下的强非线性振动,在考虑几何非线性的同时,结合不同面内静载条件,利用能量法求解了矩形板的振动响应模式,并研究了横向动载荷对矩形板周期解的存在区域和稳定性的影响。     

应用混合变量法求解弹性地基上厚矩形板的弯曲

应用混合变量法求解了弹性地基上四边简支厚矩形板在数点集中载荷作用下的弯曲,给出了六点作用不同集中载荷弹性基厚板的挠曲面方程和应力函数方程,并进行数值计算,将计算结果与有限元结果进行了分析对比。     

中厚板在面内双向压缩作用下的屈曲和后屈曲

采用Ｒｅｉｓｓｎｅｒ－Ｍｉｎｄｌｉｎ板理论考虑横向剪切变形影响，并计及板的初始几何缺陷，用文［１］提供的二次摄动法给出完善和非完善，各向同性和正交各问异性中厚板在面内双向压缩作用下的屈曲载荷关系曲线和后屈曲平衡路径。     

矩形薄板在非保守力作用下的动力稳定性

用弹性非保守系统自激振动的似固有频率变分原理,导出矩形薄板受均胡从力的变分方程,进而导出此问题的有限元基本方程及求解临界力和固有频率的特征方程,用载荷增量法计算了在不同边界条件下,不同边长比的矩形薄板在面内受均布随从力作用的临界载荷,分析了两相材料组合板的临界载荷与模量比的关系,计算结果表明,边界条件对薄板的动力稳定性有较大影响,它不仅影响临界载荷,而且对板的屈曲形式起决定性作用。     

复合材料球形阵列结构压入力学模型及弯曲变形协调机制

为了从结构力学角度揭示集中载荷作用下复合材料球形阵列结构的弯曲变形协调机制,建立了该结构典型局部板格的压入力学模型,采用载荷叠加法将集中载荷作用下四角点弹性支承且四边受等弯矩正交各向异性矩形板线性弯曲的中心点挠度分为2个部分:集中载荷作用下四角点弹性支承且四边自由的板的挠度,以及四边受等弯矩的板的挠度.前者可进一步分解为集中载荷作用下四角点弹性支承刚性板的挠度和集中载荷作用下四角点刚性支承线弹性板的挠度,后者可进一步分解为左右边简支上下边受相同弯矩的板的挠度以及上下边简支左右边受相同弯矩的板的挠度.将相同厚度的板在不同载荷情况下的挠度计算结果与有限元分析结果进行比较,进一步开展了试验验证,验证了解析解的正确性.      

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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