求解非线性电阻电路的神经网络方法

提出的求解具有凸特性ＣＰＷＬ非线性电阻电路的神经网络方法，具有与常用电路分析软件相容的数据格式，且待求变量少，精度高，是一种可靠的求解方法。该方法也可推广到具有凸待性由ＣＰＷＬ描述的多端子非线性电阻电路的求解工作中去。     

含非线性时变互感电路的计算机辅助分析

基于电路理论和数值积分和原理，导出非线性时变互感关于梯形算法的电路模型，提出一种便于用计算机对含非线性时变互感电路进行瞬态分析的方法，将含非线性时变互感电路的瞬态分析简化为若干非线性时不变电阻性电路的直流分析。     

含有非线性电阻的动态电路唯一稳态的研究

利用矩阵分解方法，在用常数界定元件成分关系斜率条件下，得到了确定具有分解形式的高维含有非线性电阻的动态电路唯一稳定条件，结果表明，含有非线性电阻的动态电路的唯一稳态，可以用分解矩阵的稳定性决定。     

非线性电阻电路解的存在性与唯一性的研究

介绍了近年来国内外有关非线性电阻电路研究状况的７个定理,特别是对于非线性电阻电路解的存在性与唯一性方面的研究成果和研究方法进行了较详细的比较,提出了非线性电阻电路解的存在性与唯一性的研究取决于非线性电阻电路的结构特性和各元件的特性参数等几个观点     

非线性动态电路故障诊断的递推方法

研究了非线性模拟电路的故障诊断问题,利用非线性网络频域分析的递推算法,将非线性模拟电路和邦联诊断转化为对ｎ个拓扑相同,电路参数战略有不同的线性电路的故障诊断。诊断的实现依赖于在相应数量的频率点上测出各阶线性电路的领域域核,采用故障逻辑判定技术以简化计算,适当增加测试点,用节点撕裂法可将该诊断方法推广到大规模电路。     

遗传算法在非线性电路分析中的应用

本文提出了一种用遗传算法求解非线性电阻电路方程的方法，并通过实例进行了验证。实验证明这一方法可以有效地防止传统数值解法中的迭代振荡和发散问题，可广泛用于非线性电路的分析。     

非线性电阻电路灵敏度的研究

讨论分析了应用灵敏度定义和伴随网络计算非线性电阻灵敏度的方法 ,指出问题的关键是求具有一定精度的非线性电阻离散化等值电路模型 ,并给出了计算实例     

非线性电阻电路灵敏度的研究

讨论分析了应用灵敏度定义和伴随网络计算非线性电阻灵敏度的方法,指出问题的关键是求具有一定精度的非线性电阻离散化等值电路模型,并给出了计算实例.     

蔡氏电路静态非线性子电路的直接设计方法

首先总结蔡氏电路中静态非线性电路的两个并联限幅运算放大器构成分段的线性负电阻特性的电路结构,分析这种电路结构的不足之处是负电阻非线性的构成方法是两个不同折点线性叠加构成的间接方法.提出由一个负电阻电路产生分段非线性的非线性正电阻直接构成方法,指出这是一种钳位电路,设计出两种类具体电路,分别给出了电路仿真实验结果,分析了电路误差并指出这一误差并不影响电路性能的原因,也给出进一步修正误差的设计方法,分析了物理电路设计的问题.     

在常数界定元件成份关系斜率条件下,含有非线性电阻的动态电路唯一稳态研究

利用矩阵分解方法,在用常数界定元件成份关系斜率条件下,得到了确定具有分解形式的高维含有非线性电阻的动态电路唯一稳态的条件。本的结果表明,含有非线性电阻的动态电路的唯一稳态,可以用分解矩阵的稳定性决定。由于目前已有的经典结果只能处理含有线性电阻的动态电路的唯一稳态,因此本的工作大大扩展了已有的经典结果。     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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