两端截尾分布的应力-强度干涉模型

利用应力－强度干涉模型理论建立了应力和强度都是截尾分布时机械零构 可靠度计算公式,消除 了目前使用和理论分布进行零构件可靠度可靠度永远小于１的情况,使可靠度计算更符合实际情况。     

涡轮增压器叶片的静强度模糊可靠性分析

以有限元分析程序为“抽样工具”，得到叶片应力与其相关因素的一系列抽样值，并利用模糊线性回归方法得到了叶片应力的模糊回归方程．基于模糊应力－随机强度干涉模型，求取了涡轮增压器叶片的模糊可靠度，实例表明该方法是可行的     

涡轮增压器叶片的静强度模糊可靠性分析

以有限元分析程序为“抽样工具”，得到叶片应力与其相关因素的一系列抽样值，并利用模糊线性回归方法得到了叶片应力的模糊回归方程，基于模糊应力－随机强度干涉模型，求取了涡轮增压器叶片的模糊可靠度，实例表明该方法是可行的。     

以可靠度为基础的起重机金属结构疲劳许用应力计算

给出了基于可靠度的疲劳强度的许用应力计算公式．当结构抗疲劳损伤强度Ｑ和结构疲劳损伤量Ｄ均为正态分布或对数正态分布时，疲劳许用应力与可靠度有一一对应关系，并可用显式表示．     

一类并联系统结构可靠度的估计

考虑了应力服从SGBVE分布,强度服从指数分布的应力—强度模型,给出了三元件并联系统结构可靠度的表达式,并在应力参数未知情形下给出了该模型可靠度的估计,并讨论了其性质.     

一类混联系统结构可靠度的估计

本文考虑了应力服从SGBVE分布,强度服从指数分布的应力—强度模型,给出了三元件混联系统结构可靠度的表达式,并在应力参数未知情形下给出了该模型可靠度的估计,并讨论了其性质.     

用契比谢夫不等式估计设备失效概率的上限

可靠度的估计是可靠度分析中重要问题，本文分析当强度、应力的分布函数未知时，估计机械设备失效概率。     

一类应力——强度干涉模型的Bayes可靠性分析

在应力—强度干涉模型中，当应力服从指数分布，强度服从伽玛分布情况下讨论了给定验前分布情况下可靠度的Bayes估计。并给出了数值例子，通过分析表明，Bayes模拟结果较好。     

正态-极值Ⅰ型可靠度的Bayes方法

在强度一应力模型中,设强度服从正态分布.应力服从极值Ⅰ型分布,其中应力已知,强度未知。本文应用 Bayes 方法,就强度参数的无信息验前分布得到了结构可靠度 P,的置信下限和正态一正态模型可靠度的置信下限.最后给出了实例计算。     

应力为二元Weinman型指数分布强度为指数分布下结构可靠度的估计

考虑了应力服从二元Weinman型指数分布,强度服从指数分布的应力-强度模型,分别在应力参数和强度参数未知情形下给出了该模型可靠度的估计,并讨论了其性质.     

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