克莱罗(clairaut)方程在二次曲线逆命题中的应用

用初等方法解决二次曲线的逆命题问题非常复杂,而应用克莱罗方程就能方便地解决此问题,此方法简便、高效。     

MCM布线中求取最大加权不相交匹配的有效算法

ＭＣＭ在集成电路封装中的广泛应用,迫切需要高效准确的布线．四通孔布线算法用于实际ＭＣＭ布线时,需要解决最大加权不相交匹配问题．基于现在解决此问题较复杂,在描述四通孔布线和把此问题转化为求取最大链问题的基础上,提出了一种有效算法来解决最大加权不相交匹配问题,其主要思想是利用求最长路径的方法来解决最大链问题;证明了此算法并给出实际的布线结果．实践证明,此算法和以前的方法相比具有简单和高效的特点     

系统理论对解决高校全开架书库错、乱架问题的实践与思考

本文联系实际,运用系统论的方法对错乱架问题进行了探讨,分析了以往解决此问题方法的局限性,并提出了解决错乱架问题的新思路     

利用立体角求解带电半球面球心处的场强

为了求解均匀带电半球面球心处的场强,采用立体角的方法来处理此问题,结果表明:采用立体角的方法来求解决均匀带电半球面球心处的场强与使用分割带电体直接积分方法处理此问题虽然采用的方法不同,但可以得到相同的结果,与分割带电体直接积分方法相比,使用立体角的方法来求解此问题更为简便.该方法为处理均匀带电体场强问题的求解提供了新的思路,使此类问题从新的角度得到了更为简便的解决方法,并且可以为求解均匀带电球面、球冠、柱面的场强等相关类型的问题提供可参考的研究方法.     

用矢量三角形叠加法讨论抛体运动的有关问题

矢量分解法是解决力学问题的一种重要方法,但是在一般力学教材中只介绍常用的分解方法--正交分解法,使初学者只会用此方法解决矢量问题.其实不然,由矢量的线性相关性理论,任何矢量都可以表示成几个特定方向的单位矢量的线性组合.因此,本文主要是运用矢量三角形叠加法研究抛体运动,从而使我们对用此方法解决矢量问题有了另一种理解.     

利用混沌优化方法求解圆形Packing问题

本文利用混沌优化方法求解圆形Packing问题,为解决此问题提供了一种新的思路.     

产品质量问题解决的系统方法应用——以SAES公司ABC电机质量问题解决为例

以SAES公司的ABC电机质量问题解决为典型案例,借助管理的系统方法理论阐述了产品质量问题解决的一般思路和常用的分析方法,及其应用过程中的重要原则;在此基础上提出了产品质量问题解决的“315逻辑模式”,为产品质量问题或其他系统问题的分析解决提供一种参考.     

土地定级中多因素综合评判法的定权问题研究

该文阐释了采用特尔菲法定权时产生偏差的原因,并提出建立土地定级因素的全要素体系的方法来解决此问题.实践证明,此方法不仅能快速有效地解决现有定权方法产生的偏差,还可以减少土地级别更新时重新进行专家打分的工作量.可为土地定级工作借鉴.     

基于事例推理的医学诊断专家系统

基于事例推理CBR(Case-basedReasoning)是一种问题学习和解决的推理方法,它的基本思想是通过参照过去的类似问题解决方法来解决现在所遇到的问题,这一过程与医学专家在看病过程中所采取的方法很相同.基于此,本文给出了一个基于事例推理的常见疾病诊断专家系统设计模型.     

填补法在U型架问题中的应用

填补法是解决物理中有关问题的一种有效方法,本文具体论述了此方法的优点,并举例说明了在U型架类问题中的应用。     

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.     

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