非饱和多孔介质热湿传输的一般数学模型

提出了非饱和多孔介质热湿传输的一般数学模型，此模型引入了在非饱和多孔介质中同时发生热质交换的多种传输机制，以使质量、动量和能量方程得到改进．引用由Ｗｈｉｔａｋｅｒ建立的体积平均法，讨论达西定律应用于非饱和多孔介质的限制．     

非饱和多孔介质热湿传输的一般数学模型

提出了非饱和多孔介质热湿传输的一般数学模型，此模型引入了在非饱和多孔介质中同时发生热质交换的多种传输机制，以使质量、动量和能量方程得到改进，引用由Ｗｈｉｔａｋｅｒ建立的体积平均法，讨论达西定律应用于非饱和多孔介质的限制。     

非饱和土壤中重金属污染物迁移机理分析

视土壤为非饱和多孔介质,将描述非饱和多孔介质中多种迁移场量耦合的热质传递模型,结合土壤中溶质迁移的对流-弥散规律,并考虑土壤固体骨架对重金属污染物的吸附特性,建立非饱和土壤中重金属污染物迁移的数学模型.数值分析了非饱和土壤不同深度处和土壤含湿量不同时,污染物在土壤中的迁移状况.随着土壤深度的增加,污染物在土壤中的迁移呈现滞后性;湿含量较高的土壤,在迁移状况趋于稳定时,污染物沿土壤深度的增加其浓度梯度相对较小,数值分析所得污染物在土壤中的迁移规律与文献已有试验结果相一致.因此,所建立的数学模型和数值分析结果,可为分析重金属污染物在土壤中的迁移状况和修复重金属污染的土壤提供一定的理论指导.     

土壤热湿迁移实验与数值模拟的研究

对蒸发状况下土壤中的热湿迁移进行了实验研究，同时也相应条件作了数值模拟，所得结果能够相互验证，在此基础了阐述了土壤中热湿迁移的一般规律。     

HIPAS 系统中热湿传输的理论模型

从连续介质流体力学的观点，采用局部体积平均方法，建立了一个描述作物覆盖条件下土壤热湿迁移过程的二维数学模型．以能量平衡原理及土壤层水汽扩散理论为基础，建立了根系吸水吸热、作物蒸腾和土面蒸发模型．两者耦合适用于求解ＨＩＰＡＳ系统中热湿传输问题．     

温度效应对非饱和土壤中湿分迁移影响的实验

在多种条件下,对非饱和多孔土壤中温度和湿分分布的动态特性进行了实验研究,分析了温度效应对水分运移的影响.结果表明:温度对土壤水分含量的影响显著,随着温度升高,土壤持水性降低,水分含量明显降低;在周期性变化的土壤温度的作用下,土壤水分含量则呈周期性变化;土壤润湿度与温度变化幅度共同决定温度效应对土壤湿分迁移的影响程度,由温度和温度梯度引起的湿分迁移在含水量中等程度的土壤中作用明显.     

土壤热湿迁移实验与数值模拟的研究

对蒸发状况下土壤中的热湿迁移进行了实验研究,同时也对相应条件作了数值模拟,所得结果能够相互验证．在此基础上阐述了土壤中热湿迁移的一般规律．     

蒸发状况下土壤中热湿迁移的非稳态数值模拟

给出了计算不饱和土壤中热湿迁移的二维数学模型 ,对蒸发状况下土壤中的热湿迁移过程进行了非稳态数值分析 ,探讨了土壤热湿迁移对环境参数和土壤内部参数 (质地、结构参数 )的动态响应特性     

蒸发状况下土壤中热湿迁移的非稳态数值模拟

给出了计算不饱和土壤中热湿迁移的二维数学模型,对蒸发状况下土壤中的热湿迁移过程进行了非稳态数值分析,探讨了土壤热湿迁移对环境参数和土壤内部参数（质地、结构参数）的动态响应特性。     

非等温入渗条件下土壤中水分运移的解析分析

基于多孔介质渗流力学-热力学理论，建立了非等温条件下土壤中水-热耦合迁移的数学模型，并运用分离变量法和拉普拉斯（Laplace）变换对模型进行解析求解；通过算例分析，表明温度对非饱和土壤中水分迁移的影响。本文所得结果及结论，对于农田水利保护和地下水资源的利用具有重要的实际应用价值和理论意义。     

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     

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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