解线性互补问题的多分裂多松弛因子迭代算法

考虑矩阵的多重分裂与处理器的并行计算,提出了求解线性互补问题的多分裂多松弛参数迭代算法,利用M-矩阵和H-矩阵的性质及松弛迭代的收敛性,证明了算法产生的迭代点列的聚点为原互补问题的解。最后,为提高算法的收敛速度,分析了ILU分解预处理技术的收敛特性。     

解线性互补问题的非精确松弛多分裂算法

基于矩阵的非精确分裂和多重分裂、处理器的并行计算和松弛迭代算法,提出了求解线性互补问题的非精确松弛多分裂算法,当问题的系数矩阵为对角元为正的H-矩阵时或对称半正定时,证明了算法的全局收敛性.并在一定条件下给出了非精确松弛多分裂算法内迭代的特殊形式,分析了该情形下算法的收敛特性.     

求解一类非线性互补问题的广义模基矩阵分裂迭代法

通过引入新的正对角参数矩阵, 提出了求解$H$-矩阵非线性互补问题的广义模基矩阵分裂迭代法和广义二步模基矩阵分裂迭代法, 取定特殊的正对角参数矩阵和矩阵分裂后, 两种算法都可转化为已有的模基矩阵分裂迭代法, 因此是已有求解线性互补问题和非线性互补问题模基矩阵分裂迭代法的推广. 利用$H$-矩阵的相关性质建立了两种算法的收敛性分析, 在算法收敛的充分条件中, $H$-分裂的假设比已有的非线性互补问题模基矩阵分裂迭代法$H$-相容分裂的收敛条件更弱; 另外, 所得到的正对角参数矩阵的收敛域比已有非线性互补问题模基矩阵分裂迭代法的收敛域更大, 因此收敛性结果是已有算法收敛性结果的推广改进, 这表明新的正对角参数矩阵是有效的.     

线性互补问题的SSOR多分裂算法

运用矩阵的SSOR多分裂和松弛迭代算法,提出了一类求解线性互补问题的数值解法.在一定条件下分析了算法的全局收敛性和松弛因子的范围,扩大了以往求解线性方程组的SSOR多分裂迭代算法的收敛区域.     

解线性互补问题的多重分裂乘性Schwarz算法

运用矩阵多重分裂理论并考虑并行计算,建立求解线性互补问题的多重分裂乘性Schwarz迭代算法,给出算法的收敛性定理,应用加权最大模获得了算法的收敛速度．数值结果表明,多重分裂乘性Schwarz迭代算法具有很好的有效性．     

一般二次规划的一种分解算法

提出了求解一般二次规划问题的一种分解迭代算法.算法的主要思想是对问题的Hessian矩阵G进行正则分裂,即G=N H并且满足N-H是正定的.在每次迭代中用一个易于求解的矩阵N代替G进行计算.在矩阵G是正定的条件下,算法具有线性收敛性质,产生的迭代点列收敛到原问题的最优解.当矩阵G不正定时,算法产生的点列收敛到问题的稳定点.     

对称仿射二次锥互补问题的二级迭代算法

仿射二次锥互补问题是一类重要的均衡优化问题,包括线性互补问题、半定互补问题、非线性互补问题等。基于矩阵分裂,提出了求解对称仿射二次锥互补问题的一类迭代算法,给出了算法的全局收敛性。并在一定条件下分析了算法的收敛速度。     

两步模系矩阵分裂算法求解弱非线性互补问题

考虑两步模系矩阵分裂算法求解弱非线性互补问题,理论分析给出了当系数矩阵为正定矩阵或H+-矩阵时迭代法的收敛性质和两步模系超松弛迭代法的参数选取范围.数值实验表明,两步模系矩阵分裂算法是行之有效的,并在迭代步数和迭代时间上均优于模系矩阵分裂算法.     

求解分裂可行问题的一种新算法

主要对解决分裂可行问题的松驰CQ算法进行修正,设计了一种新的算法.该算法在每步迭代中应用类-Armijo搜索来获取步长,避免了矩阵逆和矩阵最大特征值的计算,而且在每步迭代中都根据当前迭代点的信息选择合适的步长,证明了该算法的全局收敛性.     

EAOR投影迭代算法求解一类对称双正型线性互补问题

研究求解一类对称双正型的线性互补问题的EAOR迭代算法．证明了由此算法产生的迭代序列的聚点是线性互补问题的解．并且，当互补问题中的矩阵为对称双正加阵或严格对称双正阵时，算法产生的迭代序列存在子序列收敛到互补问题的解．而当矩阵为非退化对称双正加阵时，该序列收敛．     

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