一个环境治理价值的估算模型

分析和研究了一种现有的环境价值估算模型，指出了该模型的缺陷和局限性；根据效用和福利经济学理论，探讨了一个基于医疗保健水平的环境治理价值的估算模型；给出了相应的估算方法及技术，并通过一个简单的例子对该方法进行说明。     

石油勘探领域期权波动率参数阶段性估算

对石油勘探项目实物期权应用模型中的波动率参数性质及其在计算石油勘探项目的期权价值中的作用进行了分析，提出了适合石油行业易于操作的波动率参数的计算模型。以净现值法为基础，应用蒙特卡罗原理，提出了在石油产量和市场油价随机变动条件下石油勘探项目实物期权应用模型中不同阶段的波动率参数估算方法。实例分析结果表明，该方法能够相对准确地估算出石油勘探项目实物期权模型中的阶段性波动率参数。     

基于SMBT的软件测试价值增量估算模型

在一个具体的软件项目测试实例中,通过考察实施SMBT过程前后各测试要素值的变化,估算了实施SMBT后测试效率与效能的提升值,以及该软件测试价值的增量值,并由此构建了软件测试价值增量的估算模型。     

复杂载荷下的疲劳寿命估算

从疲劳过程本质上是材料静强度不断退化过程的观点出发，建立了一个强度退化模型．将模型应用于两级、多级和随机载荷下疲劳寿命估算，经试验和算例验证，表明该方法是合理可行的     

复杂载葆下的疲劳寿命估算

从疲劳过程本质上是材料静强度不断退化过程的观点出发，建立了一个强度退化模型，将模型应用于两级、多级和随机载荷下疲劳寿命估算，经试验和算例验证，表明该方法是合理可行的。     

评价和控制投资估算精度的一种方法

提出了一种用ＤＥＡ（ｄａｔａｅｎｖｅｌｏｐｍｅｎｔａｎａｌｙｓｉｓ）模型（Ｃ２Ｒ）评价和控制建设项目投资估算精度的方法。该方法根据拟投资项目在评价模型中的最优目标函数值来判断其投资估算的合理性。最后给出了一个应用案例。     

改进的RLC互连线延时估算方法

为了提高超大规模集成电路中全局互连线延时估算的精度,提出了一种基于RLC模型延时估算的方法.该方法将互连系统中的延时分为2部分: 电磁波传输延时和波形上升沿延时,并分别进行估算.计算出电磁波传输延时,并消除其对原传输函数的影响得到一个新的传输函数.利用一种稳定的二阶RLC模型对新传输函数进行逼近,估算出波形上升沿延时.实验结果表明: 该方法在后者远大于前者的时候,其估算结果至少能保证和传统方法有相同的精度.而在两者大小相当的情况下,该方法能够较大地提高对延时估算的精度.     

随机疲劳寿命的估算

概述了随机疲劳寿命估算的一般过程,就该过程中的局部真实应力应变分析的简化计算方法和随机载荷下的循环应力应变模拟及疲劳损伤进行了探讨。依据实验结果,提出了一个能量损伤模型,通过寿命估算,对提出的模型进行了验证,并将其估算结果与现有的几种典型疲劳损伤模型估算结果进行了比较。同时,还讨论了疲劳性能参数的波动对寿命估算精度的影响。     

考虑液膜破裂的液膜传质数学模型

提出了考虑液膜破裂因素的液膜渐近前沿模型和空间心球壳膜型。实验证明，该模型更能与实验数据相吻合，据此求出了最佳操作时间，其中渐近前沿模型比球壳型更佳。但空心球壳模型数学处理简单，在工程上具有估算价值。     

重庆市沙坪坝区植被覆盖度的遥感估算

植被覆盖度是衡量地表植被覆盖的一个重要指标,在许多方面作为重要参数输入。根据像元二分模型原理和归一化植被指数,利用归一化植被指数（NDVI）定量估算植被覆盖度的模型可以求得研究区域的植被覆盖度。本文根据该模型对重庆市沙坪坝区进行了植被覆盖度的遥感估算,结果表明,该方法简单易行。     

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

正~~