改进的满意度函数法在多响应优化中的应用

满意度函数法是最常用的多响应优化方法，但该方法没有考虑响应的变异性、相关性和参数估计的不确定性，针对这些问题提出了改进的满意度函数法对其进行改进，该方法将响应方差-协方差结构和预测方差结合到满意度函数中．实例分析表明，与传统满意度函数相比，用该方法进行优化得到的响应的方差和预测方差分别降低了5．6％和6．2％，满意度函数的方差降低了7％，说明优化结果比较可靠．因此，用该方法进行优化能得到比传统满意度函数法较好的结果，且对模型的预测能力和响应的波动都具有稳健性．     

非线性系统参数识别的频域方法

系统识别是现代控制过程的关键环节．本文提出了一种识别弱非线性振动系统参数的方法．本方法中，参数识别的数学模型是系统的一阶近似频率响应函数．首先，用多尺度法导出弱非线性强迫激励系统的频率响应函数．接着，利用非线性参数变换将此频率响应函数变换为系统参数的线性函数，在此基础上用最小二乘法识别系统的参数．最后，通过数值模拟检验了方法的精度．     

化简逻辑函数的新方法

代数法化简逻辑函数的难点在于没有固定的方法和步骤，函数式是否化简到了最简也没有判别方法．文中提出的“准多余项化简法”解决了这些难题，给出了化简的具体步骤和最简式的判别方法．对于６个以上的变量逻辑函数的化简，此法显著优于卡诺图法．     

判定函数单调性的一个新方法

判定函数单调性的一个新方法王如鸿（市高压开关厂技工学校）众所周知，判定复合函数的单调性可用求导法及定义法，但求导法需高等数学的知识，用定义需很高的数学技巧，推导极复杂．本文将用初等方法──分解法解决复合函数单调性判定问题．定理设函数ｙ＝ｆ（ｕ）在Ｕ内...     

预应力斜拉网格结构的静力优化分析

提出基于合理预应力取值的二级优化方法对预应力斜拉网格结构进行静力优化，对预应力优化和截面优化分别采用不同的目标和方法．杆件截面尺寸的二级优化采用结构自重为目标函数，优化方法可以采用拟满应力法；对预应力取值的一级优化可以采用结构应变能为目标函数．用ANSYS可编程语言APDL编制采用初始应变影响矩阵法和多次复形法进行预应力取值优化分析的程序，并对按不同目标函数进行预应力取值优化得到的结果进行了比较．采用不同目标函数得到的预应力取值优化结果有所差别．宜根据实际需要选择合适可行的目标函数．     

利用参数变导法构造辅助函数

微分学中有3个著名的中值定理，其中Lagrange中值定理的证明，引入了辅助函数，然后由Rolle中值定理来证明Lagrange中值定理，这个突如其来的辅助函数很难理解和接受．利用参数变异法引入辅助函数，给出了一种辅助函数的“统一”构造法，并利用这种方法解决了一些具体问题．     

误差函数计算方法的研究

误差函数已有多种计算方法，其中按e^-t^2的幂级数展开式为基础的算法，数学上是收敛的．且在科技应用范围内，数值上也是收敛的．数值积分法，如梯形法是计算误差函数更好的方法，文中给出了控制积分变量等分数目的计算公式，并得到了很好的计算结果．     

相空间重构延迟时间与嵌入维数的选择

论述相空间重构中延迟时间与嵌入维数之间的关系，提出广义嵌入窗长的概念．分析已有的自关联函数法中的不足，提出一种改进的自关联函数法确定广义嵌入窗长，从而确定出相空间重构的其它参数．同时从时间序列相关程度和不相关程度2个方面进行考虑，克服了自关联函数法的缺点．仿真实验结果验证了该方法的有效性．     

确定低渗透油藏油井平均压力的拟函数法

提出一种利用早期压力恢复数据确定平均油藏压力的拟函数法．该方法克服了过去计算方法中关井时间长的缺点，且简单易懂，操作方便，不需要压力恢复数据以外的其它资料．应用实例表明，用拟函数法确定的地层压力介于其它各种方法所求地层压力值之间，从而说明该方法计算结果准确可靠     

Jacobi椭圆函数展开法及其应用

借助于计算机代数和吴方法，本文给出了一种求非线性波动方程精确解的方法——Jacobi椭圆函数展开法．此方法改进了已有的Jacobi椭圆正弦函数和Jacobi椭圆余弦函数展开法．应用此方法，本文不仅得到了KdV方程、Boussinesq方程以及Klein-Gordon方程的已有的实数解，还给出了新的复数解、在它们的极限条件下，新的周期速解和冲击波解也被获得．     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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