Lurie型鲁棒控制系统的绝对稳定性

在实数Ｒ上一切闭区间组成的集合和区间矩阵的集中中引进了代数运算，讨论了Ｌｕｒｉｅ型直接鲁棒控制系统ｘ＝Ｇ「Ｂ，Ｃ」ｘ＋Ｇ「Ｒ，Ｓ」ｆ（σ）；σ＝ｃ＾Ｔｘ，ｆ（．）∈Ｋ「０，∞」和间接鲁棒控制系统ｘ＝Ｇ「Ｂ，Ｃ」ｘ＋Ｇ「Ｒ，Ｓ」ｆ（σ）；σ＝ｃ＾Ｔｘ－．ｆ（．）∈Ｋ「０，∞」display structure     

基于群代数元的广义迹函数

设Ｇ≤Ｓｎ，ｆ∈ＣＧ，广义迹函数Ｔｆ：Ｃｎ×ｎ→Ｃ定义为Ｔｆ（Ａ）．给出了关于广义迹函数的若干关系式．     

三级绝对连续函数的两个特征

证明了下列两组充分必要条件：ｆ（ｘ）∈ＡＣ３［ａ，ｂ］←→ｆ″（ｘ）∈ＡＣ［ａ，ｂ］←→ｆ＇（ｘ）∈ＡＣ２［ａ，ｂ］。     

一类奇异Hamilton系统的周期解

本文研究方程Ａｘ＝Ｖ（ｘ）＋ｆ（ｔ）（ＨＳ）在无界奇点集下的周期与广义周期解存在性问题,其中ｘ＝（ｘ１,…,ｘｎ）,ｘｉ∈Ｒ２（１≤ｉ≤ｎ）,Ａ是Ｒ２×…×Ｒ２上的正定矩形,Ｃ∈Ｃ１,ｆ是以Ｔ为周期的可积函数。     

极大算子的一个注记

本文证明了当Ｗ∈Ａ１，ｆ∈ＢＭＯｗ，ｉｎｆＭ（ｆ）（ｘ）＜∞时，Ｍ（ｆ）（ｘ）∈ＢＭＯ_ｗ且存在不依赖于ｆ的常数Ｃ，使得     

加权Campanato空间上的Littlewood—Paley g算子

本文证明了若Ｗ∈Ａ１，ｆ∈ε＾ｘｐｗ（加权Ｃａｍｐａｎａｔｏ空间），并且ｉｎｆｇ（ｆ）（ｘ）〈∞，那么ｇ（ｆ）（ｘ）也属于ε＾ａｐｗ并且存在不依赖于ｆ的常数Ｃ使得‖ｇ（ｆ）‖αｐ，ｗ〈Ｃ‖ｆ‖ａ，ｐ，ｗ这里０〈α〈１。     

一致平滑可分的Banach空间中K-正定算子方程的逼近解(英文)

设Ｅ是可分的一致平滑Ｂａｎａｃｈ空间,Ａ：Ｄ（Ａ）Ｅ→Ｅ是一个Ｋ－正定算子。构造了一个迭代序列强收敛于算子方程Ａｘ＝ｆ（ｆ∈Ｅ）的唯一解。所做工作推广了Ｃｈｉｄｕｍｅ与Ｏｓｉｌｉｋｅ,Ｃｈｉｄｕｍｅ与Ａｎｅｋｅ等人的结果。     

图的循环带宽的Harper型下界

设Ｇ为具有ｎ个顶点的图，Ｚｎ为模ｎ整数加群．从Ｇ的顶点集到Ｚｎ的任一双射ｆ称为Ｇ的一个循环标号．ｆ的循环带宽Ｂｃ（Ｇ，ｆ）定义为ｍａｘ（ｕ，ｖ）∈Ｅ（Ｇ）ｄ（ｆ（ｕ），ｆ（ｖ）），其中对任意ｘ，ｙ∈Ｚｎ，ｄ（ｘ，ｙ）＝ｍｉｎ｛｜ｘ－ｙ｜，ｎ－｜ｘ－ｙ｜｝．Ｇ的循环带宽Ｂｃ（Ｇ）是指对Ｇ的所有循环标号ｆ的循环带宽的最小值．借鉴关于带宽的已有结论，深入讨论循环带宽的Ｈａｒｐｅｒ型下界，所得结果将有助于确定一些特殊图的循环带宽     

等变Sard—Smale定理

在紧致李群Ｇ作用下的Ｂａｎａｃｈ空间Ｘ中,通过紧摄动方法和有限维逼近技巧,克服了现有结论对空间的光滑性限制和对映射的全连续限制,Ｓａｒｄ－Ｓｍａｌｅ定理被推广为一致等变形式。设ｆ∈（Ｃ＾１（Ｘ,Ｘ）是Ｇ－Ｆｒｅｄｈｏｌｍ映射,则对任意的ε〉０,都存在Ｇ等变全连续映射α∈Ｃ＾１（Ｘ,Ｘ）,使得ｆ＋α的零点轨道正则并且‖α‖〈ε。     

半正定Hermite矩阵的一个不等式

设Ａｊ，Ｂｊ∈Ｃｎ×ｎ（ｊ＝１，２，…，ｍ）为半正定的Ｈｅｒｍｉｔｅ矩阵，本文建立了下列不等式．     

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