受约束非线性控制系统正则方程的可解性分析

讨论了受约束条件下的非线性控制系统，通过Taylor一阶展开，在每一失代步中将问题转化成线性约束控制问题，进一步通过变分原理，对一般情况建立了约束变量的正则方程，进而建立了约事变量的极值变分原理，由此进行了正则方程的可解性分析，结果表明，约束变量二次型的系数阵满足可逆且负定的条件下，控制系统正则方程存在可解性，这对非线性控制系统的处理具有很大意义。     

含一般非线性项Kirchhoff型约束变分问题Schwarz对称极小解的存在性

利用约束变分理论和对称递减重排技巧考虑一般非线性项情形下一类Kirchhoff型约束变分问题Schwarz对称极小解的存在性和不存在性.针对非线性项的指数和约束∫RN| u |2dx=c2中的c与极小化问题Schwarz对称极小解存在与否的关系,得到了一个细致明确的划分.     

加速系中的高阶微分变分原理和积分变分原理

建立了加速参考系中的最一般的高阶微分变分原理及积分变分原理，假定了高阶微分运算ｄ和高阶变分运算δ的新型交换关系，建立了与之相应的各种形式的高阶非线性非完整系统的积分变分原理．并由此导出相应的加速系力学组的运动方程，还推广了Ａｐｐｅｌｌ－Чｅтａｅв关于约束加在虚位移上的条件．     

大变形非线性弹性动力学的分区变分原理

该文提出了论证分区变分原理的“Ｎ＞２直接方法”，并且用这一方法把大变形非线性弹性静力学的分区变分原理￣［１］推广到弹性动力学问题。该方法提出并解决了在从Ｎ＝２情形推广到Ｎ＞２情形的过程中必然存在的问题。当非线性高阶项可忽略时，由该文结果可直接得到线性弹性动力学的分区变分原理及其广义变分原理￣［２］。该文结果可以作为大变形非线性弹性动力学问题有限元计算的基础。     

具次临界扰动项的非线性Hartree方程驻波的存在性

研究了一类具次临界扰动项的非线性Hartree方程驻波解的存在性.根据2个非线性项的特征,分2类情形建立相应的约束变分问题,得到了该类Hartree方程在2种情形下驻波的存在性.     

二维有旋流动赝势函数变分原理

通过对Euler空间的Hamilton原理的详细的数学分析,把两个林家翘约束变换为一个约束;并以变分所得欧拉方程为基础,从另一个角度推导出了动量方程;通过对变分边界项的分析,构造出了自然边界条件,进而得出计算二维流场的赝势函数变分原理。     

二阶非完整非保守动力学系统的守恒律

本文应用Jourdain微分变分原理研究了非保守力学系统的守恒定律,给出了受二阶非线性非完整约束的非保守系统的广义Noether等式。     

具有混合非线性项的Schrdinger方程临界值的存在性

通过将约束变分问题中的泛函转化为非负泛函,利用Schwartz对称化、Lagrange乘子及最优Sobolev不等式等经典变分方法,研究了混合非线性项为质量超临界项加上能量临界或者次临界聚焦项的Schrdinger方程临界值的存在性问题,证明了临界值的存在性,并给出了临界值,为进一步研究此类方程的整体适定性和散射奠定了基础.     

集值映射型广义Ekeland变分原理

在序拓扑向量空间中定义了集合的非线性标量化函数,
 并证明了它的一些性质. 利用集合的非线性标量化函数, 给出了关于集值映射的广义Ekela
nd变分原理, 此变分原理是向量形式广义Ekland变分原理的推广.     

紧集上锥约束集值平衡问题解的存在性

平衡问题理论在非线性分析、最优化以及数理经济学等方面都有广泛的应用.本文讨论的是更具意义的锥约束集值平衡问题,并通过集值Ekeland变分原理,证明了紧集上锥约束集值平衡问题解的存在性.     

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