关于非平稳过程处理的几个注解

研究了非平稳的含义、非平稳随机过程的等效和幂律过程处理等几个问题．首先，阐述了非平稳存在两种理解，一种是针对确定性过程，另一种针对随机过程，二分别适用于信号处理和随机动力学计算两种情形．其次，证明任何一个非平稳过程都可以用可数个调制非平稳过程来模拟或等效．然后，指出幂律过程为平稳过程，而非献中所声明的非平稳过程．最后，论述了通过理想滤波器概念可以将幂律过程转变为各态历经过程．     

数学活动的过程知识与教学改革

就当今数学课堂教学而言。过程教学异化为结果教学的现象相当普遍，其主要原因之一是在过程教学的理念下，仍以获取结果知识为最终目的而设计教学．从数学活动的动态特征来看，“过程知识”是普遍存在的，它与提高学生的数学素养、培养学生的创新能力密切相关．因此．以获取过程知识为目的而设计教学应作为数学教学改革的重要取向之一．     

多服务员串联排队的强逼近

近年来,多服务员排队常用来为大型电话中心网络建模,以便分析其动态行为．笔者研究了一个多服务员串联排队系统,并假设到达过程为更新过程,服务时间独立同分布．利用随机过程极限,在服务强度大于等于1的条件下,得到了队长过程和加权闲期过程的强逼近,从而也将原离散的排队系统近似到一个连续的布朗运动过程,为该系统的进一步分析提供了理论基础．     

双外推法研究Zn(Ac)_2.2H_2O失水过程的动力学机理

用热分析技术对Ｚｎ（Ａｃ）２．２Ｈ２Ｏ的失水过程进行研究，证明为一步失水过程．在Ｃｏａｔｓ－Ｒｅｄｆｅｒｎ积分式和Ｏｚａｗａ公式基础上，利用双外推方法，确定Ｚｎ（Ａｃ）２．２Ｈ２Ｏ失水过程的动力学机理为ｎ＝１．５的成核与生长过程，其机理函数积分式为Ｇ（α）＝［－ｌｎ（１－α）］１／１．５，并求得相应的动力学参数．     

一类带双稀疏过程的双险种风险模型

讨论了一类带干扰且索赔为双稀疏过程的双险种风险模型．该模型假设两险种的保费收入均为复合Poisson过程,而两险种的索赔到达过程均为保单到达过程的稀疏过程,并考虑到随机扰动、保险公司的投资利率和通货膨胀率,利用鞅分析得到了该模型下破产概率的Lundberg不等式及其精确表达式．     

Internet的产品快速原型制造过程建模

过程建模是过程管理和集成的基础．在分析基于Internet的产品快速原型制造过程的基础上,分别利用IDEF3和Petri网方法建立其过程模型．描述多因素相互问的动态行为,同时解决各环节之间的并发性、异步性、分布性等问题．分析并比较IDEF3和Petri网方法的优缺点,提出以Petri网为主、IDEF3为辅的过程建模策略．     

高中物理新课程教学方法的创新与思考

高中物理教学的目标在于以物理科学的知识体系为载体．通过强化物理知识的形成过程和实际应用过程．认识科学、技术、社会的联系．体验、学会和运用科学研究的过程和方法．激励学生学习物理的兴趣．养成良好的科学态度．最终以提高学生的科学素养和培养学生的创新精神和实践能力为目标．达到全面提高素质、发展个性的目的。本文将从转变物理教学模式，激励学生学习的积极性、主动性和创造性的目的出发．对高中物理新课程的教学方法进行探讨。     

有机分散剂对ZrO2粉体粒度的影响

借助粒度分析仪、ＳＥＭ形貌观察,研究了以ＮＨ４ＨＣＯ３为沉淀剂的溶胶共沉淀法制备ＺｒＯ２粉末过程中有机分散剂对粉体团聚状态及颗粒度的影响．结果表明,沉淀过程、烘干过程中ＰＶＡ的加入可以大大改善粉体的团聚状态,适当匹配ＰＶＡ用量可以获得基本无团聚的粉末．ＰＶＡ的最佳匹配为：沉淀过程质量分数７％,烘干过程质量分数３％．     

带干扰两险种风险模型的破产概率

经典破产理论假设保险公司的盈余过程是时齐的独立平稳增量过程．但是,由于保险公司业务种类的日益增多和复杂,经典的破产模型已经不能很好地描述现实过程．随着研究的深入,人们对经典风险模型进行了各种推广,建立了更符合实际的破产模型．假设理赔额到达过程和保单的到达过程为Poisson过程,保单的保费和各险种的理赔额均为随机序列,并考虑到保险公司的投资利率和通货膨胀率,讨论了一类带干扰的两险种风险模型最终破产概率的一般表达式,得到了与经典风险模型相同的破产概率和Lundberg上界．     

用于智能材料与结构的NiTi丝的电阻特性研究

研究了拉伸过程中,ＮｉＴｉ形状记忆合金丝的应变与电阻的关系．结果表明,对于初始组织为马氏体的ＮｉＴｉ丝,在拉伸过程中,电阻与应变之间成线性关系．对于初始组织为奥氏体或奥氏马氏体两者混合的ＮｉＴｉ丝,当发生应力诱发马氏体相变后,曲线的斜率降低,相变前后电阻－应变保持线性关系．对于初始组织含有Ｒ相组织的ＮｉＴｉ丝,在拉伸过程中,电阻的变化规律较为复杂,取决于初始组织中各相的比例和温度．在卸载阶段,当没有相变过程发生时,电阻－应变之间呈线性关系;当有相变过程发生时,电阻－应变曲线的斜率会发生改变．     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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