熔喷模头双缝形喷嘴纺丝线上的气流变化

通过引入喷嘴头端宽度与气缝宽度的比值这一参数，建立了熔喷双缝形喷嘴流场纺丝线上气流速度、温度变化的经验方程，是以往经验方程的进一步完善。使用该经验方程结合熔喷理论模型进行了纤维最终直径的预测，实际预测结果证明了所建经验方程的正确性和可靠性。     

考虑胎体弹性的轮胎动态转向特性半经验模型

在现有的轮胎非稳态半经验模型和考虑胎体弹性的基础上,提出了一种轮胎非稳态转向特性关经验模型。经过试验验证,在与汽车平面运动有关的低频范围内,理论值与试验值符合较好。与已有的半经验模型相比,模型的物理意义更清楚,而且模型的精度得到了提高。它便于在车辆动力学仿真中应用。     

考虑胎体弹性的轮胎动态转向特性半经验模型

在现有的轮胎非稳态半经验模型和考虑胎体弹性的基础上 ,提出了一种轮胎非稳态转向特性半经验模型 .经过试验验证 ,在与汽车平面运动有关的低频范围内 ,理论值与试验值符合较好 .与已有的半经验模型相比 ,模型的物理意义更清楚 ,而且模型的精度得到了提高 .它便于在车辆动力学仿真中应用 .     

喷模头双缝形喷嘴纺丝线上的气流变化

通过引入喷嘴头端宽度与气缝宽度的比值这一参数,建立了熔喷双缝形喷嘴流场纺丝线上气流速度、温度变化的经验方程,是以往经验方程的进一步完善.使用该经验方程结合熔喷理论模型进行了纤维最终直径的预测,实际预测结果证明了所建经验方程的正确性和可靠性.     

坡面土壤水蚀建模方法比较

首先阐述了坡面土壤水蚀建模的必要性.考虑到原有水蚀模型类型的不足,对当前水蚀模型按解题方法重新归为形式逻辑计算模型及辩证逻辑计算模型两类.其中,形式逻辑计算模型又分为经验模型、半概念半经验模型、半过程半经验模型以及理论模型4类.结合实例阐述这几类模型的主要特性及相关关系.     

两样本参数差异的经验似然置信区间

将经验欧氏似然应用于半参数模型,讨论了在此模型下两样本参数差异的经验欧氏似然的大样本性质,证明了经验欧氏似然比统计量依分布收敛于Х^2随机变量,由此给出参数差异的经验似然置信区间。     

电子商务研究中的行为理论基础

行为理论模型在电子商务的研究中越来越发挥重要的作用。分析了行为理论模型在电子商务研究中得到广泛应用的原因,介绍了合理行为模型、计划行为模型、技术接受模型在电子商务中的应用情况,对技术接受模型在电子商务中应用的最新模型进行了述评,总结了行为模型在电子商务研究中的应用趋势。     

半敞开式隧道火灾的理论分析

为了研究隧道火灾的火羽流特性,验证半敞开式隧道采用自然通风模式下发生火灾时是否安全,在已建成的半敞开式隧道中设计并实施了全尺寸火灾试验,得到了半敞开式隧道火灾的烟气温度变化规律和烟气纵向蔓延数据.用OriginPro7.5软件对实验数据进行处理、拟合,得到隧道火灾烟气温度随着离开火源距离纵向衰减的规律;结合火灾动力学分析建立了预测烟气逆流距离的理论模型.根据隧道火灾实验结果与理论模型预测结果的对比,验证了所建理论模型的有效性.全尺寸火灾实验结果验证了李开源和H.Kurioka等人建立的隧道火羽流模型及其计算公式可以用于半敞开式隧道自然通风的研究.     

γ射线产生数据的半经验计算方法

基于蒸发模型和预平衡模型，得到了一套γ射线产生数据的半经验计算公式，在靶核２８≤Ａ≤２２０，中子入射能量Ｅｎ≤２０ＭｅＶ的情况下，计算结果和实验数据符合较好。     

锗探测器效率曲线的半经验公式拟合

本文介绍了用半经验公式对60-2600 keV能区同轴Ge(Li)、HPGe探测器对圆柱型体源探测效率曲线的拟合,通过与八参数函数进行比较,说明了半经验公式的适用性.且提出了半经验公式修正项.     

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