多孔介质中单相对流换热分析的流体渗流模式

自然界和工程上常遇到多孔介质的渗流流动和传热传质,具体的研究分析总要涉及渗流的模式问题．本文对经典达西流和Ｆｏｒｃｈｈｅｉｍｅｒ扩展达西流、Ｂｒｉｎｋｍａｎ扩展达西流以及Ｆｏｒｃｈ－ｈｅｉｍｅｒ－Ｂｒｉｎｋｍａｎ－Ｄａｒｃｙ流模式作了简明、系统的整理和综述,分析其适用的场合,供理解和研究多孔介质中的流体流动与传热传质作参考     

多孔介质平板通道发展传热的强迫对流及其热应力分析

基于Darcy模型,考虑固相和流相相互作用的粘性耗散和流体流动方向的热传导效应,研究了半无限长多孔介质平板通道局部热平衡的热发展强迫对流及其热应力问题,给出了多孔介质温度、局部Nusselt数Nu和热应力等的Fourier级数解,并考察了多孔介质温度、应力分布等的特征.同时研究了Peclet数和Brinkman数对它们的影响.     

微细管内压力功及粘性耗散对流动特性的影响

微细通道内的流动特性研究是一个新兴的研究领域,由于尺度微小,在常规尺度管流中被忽略的某些因素在微细通道中的作用将变得显著。因此,利用量级分析和数值计算的方法讨论了压力功及粘性耗散对微细管内可压缩流体绝热流动特性的影响,并得出以下结论： 对微细管道内的可压缩流体流动,压力功及粘性耗散已成为不可忽略的因素,它们的影响主要体现在使沿管程Ｍａ 增加趋缓及压降减小,但对流动阻力特性影响不大,局域Ｆａｎｎｉｎｇ 摩擦因数Ｃｆ与Ｒｅ的乘积不再是常数１６,而是局域Ｍａ 的函数,并随局域Ｍａ 的增加而增大     

微通道散热器的性能实验

对四种空气冷却的微通道散热器进行了实验研究。结果表明它们在４０℃温升和４９０Ｐａ压差下可传递１．６，４．８和７．４Ｗ／ｃｍ＾２的热流，其中一试件达２８ｗ／ｃｍ＾２（７０℃温升。８７０ＫＰａ压差）。四个试件有很大高宽比通道，分别达１６，２５，５０和６７，可有效地降低压差。实验结果用多孔介质模型进行了处理，表明Ｎｕ－Ｒｅ关系具有Ｎｕ＝ｃＲｅ＾ｎ（ｃ，ｎ是常数）的形式。但ｃ，ｎ随槽宽增大分别增大和减小。     

平板通道中热局部非平衡对努塞尔数的影响

利用傅里叶级数,研究了多孔介质平板通道中Darcy流体热局部非平衡对努塞尔数的影响.考虑流体流动方向的热传导以及固相和流相相互作用的粘性耗散,根据热局部非平衡的两能量方程模型,得到了常壁温时多孔介质固相骨架温度和孔隙流体温度的解析解.针对不同的物性参数,给出了局部努塞尔数的分布特征.通过参数研究,揭示了热局部非平衡时强迫对流努塞尔数的响应特征.     

用MIBK萃取铂族金属离子的硫氰酸配合物Ⅱ．铑（Ⅲ）的萃取

研究了在盐酸介质中硫氰酸盐序在下Ｒｈ（Ⅲ）的萃取。Ｒｈ（Ⅲ）在０．５～１ｍｏｌ／ＬＨＣｌ介质中与１０００倍以上的硫氰酸盐于沸水浴中加热６０ｍｉｎ即叮形成硫氰酸铑（Ⅲ）配合物。此配合物可在较宽酸度范围（０．５～４ｍｏｌ／ＬＨＣｌ）内被ＭＩＢＫ（甲基异丁基酮）定量萃取．相比可达１：４．通过吸收光谱实验证实有硫氰酸铑［Ｒｈ（ＳＣＮ）＿ｘＣｌ＿（６－ｘ）］￣（３－）（ｘ＞３）配合物生成，与质子化的ＭＩＢＫ生成盐而被萃取。     

微管中液态流动的粘性耗散效应研究

研究了超纯水流过水力直径为25μm和50μm的光滑微石英管时的粘性耗散规律,Reynolds数变化范围为0～700．基于微区热成像技术及一系列的相应校正测试,并综合考虑泵功及流动滞止对实验偏差,采用红外成像仪测量了微管内部由于粘性耗散而导致的温升．通过建立二维数学模型,在考虑双电层效应的基础上对其进行了数值计算．研究结果表明,Reynolds数并不能作为判定粘性耗散的影响增大或减小的唯一标准,粘性耗散带来的温升是管长、管径、流体粘度以及流速的复杂函数．将数值计算结果与实验数据进行了比较,两者基本吻合．根据两者结果,提出了采用新型准则式来描述微管内部粘性规律．     

Banach空间微分方程初值问题弱解的一个存在性定理

在弱耗散型条件ｌｉｍ／ｈ→０＾－１／ｈ［｜ψ（ｘ－ｙ＋ｈ（ｆ（ｔ，ｘ）－ｆ（ｔ，ｙ）））｜－ψ（ｘ－ｙ）｜］≤ｇ（ｔ，｜ψ（ｘ－ｙ）｜）下给出了Ｂａｎａｃｈ空间常微分方程初值问题弱解的一个存在性定理。     

用MIBK萃取铂族金属离子的硫氰酸配合物：Ⅱ.铑（Ⅲ）…

研究了在盐酸介质中硫氰酸盐存在下Ｒｈ（Ⅲ）的萃取，Ｒｈ（Ⅲ）在０．５－１ｍｏｌ／ＬＨＣ介质中与１０００倍以上的硫氰酸盐于沸水浴中加热６０ｍｉｎ即可形成硫氰酸铑（Ⅲ）配合物。此配合物可在较宽酸度范围（０．５－４ｍｏｌ／ＬＨＣＬ）内被ＭＩＢＫ（甲基异丁基酮）定量萃取。相比可达１：４。通过吸收光谱实验证实有硫氰酸铑［Ｒｈ（ＳＣＮ）ｘＣｌ６－ｘ］＾３－（ｘ＞３）配合物生成，与质子化的ＭＩＢＫ生成盐而被萃取     

抽象函数的Levi定理及应用

对实变函数论中的Ｌｅｖｉ定理在空间Ｌ~ｐ［Ｊ，Ｅ］＝｛ｆ（ｘ）｜ｆ（ｘ）：Ｊ→Ｅ是强可测函数，‖ｆ（ｘ）‖~ｐｄｘ＜＋∞｝（其中Ｊ＝［ａ，ｂ∩Ｒ１，Ｅ是Ｂａｎａｃｈ空间，ｌ≤ρ＜十∞）中进行了讨论．由此得到抽象函数Ｌｅｖｉ定理的几种形式；并得出Ｅ中锥正规、正则、全正则分别等价于Ｌρ［Ｌ，Ｅ］中的锥有相应的性质；讨论了上述结果在增算子的不动点定理及Ｂａｎａｃｈ空间非线性微分方程的迭代求解中的应用．     

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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