裘布依公式的水文地质化学动力学形式

以水文地质化学动力学方程为基础,承压含水层稳定流为例,推演了由水化学指标表示的一维和二维稳定井流的裘布依公式。在讨论化学指标表示的裘布衣公式与原公式关系的基础上,结合水文地质,水文地球化学综合模型,讨论和写出不同区带,各种矿物及相应组分化学指标表示的基本方程式。以山西晋城市新矿区抽水试验及相应的水化学指标,讨论了计算步骤和方法,最后讨论了这类公式可以推广到潜水及非稳定流各种井,梁公式中,以及用水化     

利用非稳定抽水的恢复水位资料确定潜水含水层的渗透系数

一、问题的提出利用水动力学法确定地下水水量时,含水层的渗透系数(K)是一个重要的水文地质参数。该值的可靠程度,对于水量计算值的影响极为明显。对同一试验对象来说,依据不同的试验观测资料,采用不同的计算方法和公式,所确定的渗透系数计算值,有时可以相差数倍乃至数十倍;因而,使计算的水量值,也相应地相差数倍乃至数十倍。目前,生产实践中仍然多是根据稳定抽水试验资料,利用以裘布依单井公式为代表的各种计算公式来确定渗透系数。抽水可以是在带有观测井的主井中或在无观测井的单井中进行。通常,利用两个以上观测井中的水位观测资料确定的K值较为可靠。但是,这种抽水试验需要较多的勘探及试验工作量,不是在任何情况下都有条件进行的。     

直接互惠下量子囚徒困境的演化稳定分析

为深入探讨直接互惠和量子纠缠如何影响合作的演化,运用演化博弈理论的方法建立了直接互惠下量子囚徒困境模型,计算博弈动态的均衡点并对均衡点进行稳定性分析,讨论直接互惠参数和纠缠对均衡点的影响。分析结果表明,当直接互惠参数、量子纠缠在不同条件下,合作策略和背叛策略为演化稳定策略,并且当纠缠大于临界值时直接互惠行为促进合作;纠缠小于临界值时直接互惠行为抑制合作。最后通过数值仿真验证了理论的正确性。     

一类具有脉冲效应的恒化器数学模型

分析了一个简单的具有两种微生物和周期注入营养液的恒化器模型,得到了一个微生物和营养液共存的周期解,另外,还证明了当脉冲周期小于某个临界值时,该周期解是稳定的,当脉冲周期大于该临界值时,稳定性丧失.     

一类疟疾传播模型的稳定性和后向分支

建立了一类关于疟疾传播的SIS-SI模型.首先通过分析模型的无病平衡点的局部渐近稳定性,得到了模型的基本再生数公式;然后证明了当基本再生数大于1时,模型存在唯一的地方病平衡点;当基本再生数小于1时,模型可能存在两个地方病平衡点,这表明模型会存在后向分支.证明了后向分支的存在性.讨论了无病平衡点的全局稳定性;最后对所得理论结果进行了数值模拟.     

一类具有非线性传染率的SIRS传染病模型的稳定性分析

研究了一类既有旧病复发率又有治愈率的SIRS传染病模型,且此模型的传染率为非线性的.证明当基本再生数小于1时,无病平衡点是全局指数型稳定的;当基本再生数等于1时,无病平衡点是全局渐近稳定的;当基本再生数大于1时,得到模型在地方病平衡点全局稳定的充分条件.最后,通过数值模拟为理论计算提供了依据.     

一类反应扩散系统的非平衡相变

提出一个一类反应扩散系统模型,并在三维球对称空间中对它进行了讨论经果表明:当扩散系数大于某一临界值Dc2时,则在B小于Bc时,便发生非平衡相变;而扩散系数小Dc1时,则在B大于Bc时也发生非平衡相变。     

污染环境下具有脉冲输入环境毒素的恒化器模型的灭绝阈值研究

研究了污染环境下具有脉冲输入环境毒素的恒化器模型.利用乘子理论和小振幅扰动法,得到当脉冲输入营养物小于一个临界值或环境毒素的排放量大于一个临界值时,种群灭绝周期解全局渐进稳定的结论,同时得到了种群持久的条件.从生物学观点提出了污染环境下保护物种的方法是改变营养物的输入量或控制环境毒素的排放量.     

浅论裘布衣模型的缺陷及改进方法

本文从原始的裘布衣假设模型进行分析,得出其存在的缺陷,主要包括忽略垂直分量引起的误差;处理稳定流问题时我们应该取消影响半径的概念,淡化稳定流与非稳定流之分,以非稳定流理论(包括稳定阶段)统一思想和工作方法;以及井损、水跃值引起的误差等问题的论述,以及一些改进方法。     

偏置式平行耦合带状传输线的特性分析

运用合成渐近法推导出了偏置式平行耦合带状传输线的自电容和互电容的计算公式,所得公式简单、精确,且具有清晰的物理意义.在此基础上,根据传输线基本理论计算了其奇偶模特性阻抗和耦合系数.经实例验证发现,所得公式计算结果与矩量法数值计算结果对比,最大误差小于5%,平均误差小于2%,充分验证了本文所推导公式的正确性,也为相关微波集成电路的设计及分析提供了参考.     

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