滞后非线性系统的一般化最优控制

讨论滞后非线性控制系统：ｘ（ｔ）＝ｆ（ｘ（ｔ），ｘ（ｔ－１），ｕ（ｔ），ｔ）ｔ０≤ｔ≤ｔ１ｘ（ｔ）＝φ（ｔ）ｔ０－１≤ｔ≤ｔ０关于一般形式的性能指标Ｊ＝ｃ１ｘ１（ｔ１）＋ｃ２ｘ２（ｔ１）＋…＋ｃｎｘｎ（ｔ１）给出了最大值原理和简明的证明。对单滞量线性系统推广了文［１］中的主要结论。     

一个Riccati方程解的渐近性态

该文在ｐ（ｘ）∈ｃ’「ｘ０＋∞），ｑ（ｘ）∈ｃ「ｘ０，＋∞），ｘｃ〉０且０≤１／２ｐ’（ｘ）－１／４ｐ＾２（ｘ）＋ｑ（ｘ）≤１／４ｘ＾２的条件下，研究下列Ｒｉｃｃａｔｉ方程的解的极限ｌｉｍｘ→＋∞ｙ（ｘ），ｌｉｍｘ→＋∞，ｌｉｍｚ→＋∞ｙ’（ｘ）／ｙ（ｘ），由此得到了此类方程的任一非零解存在渐近线的充分必要条件。     

Baskakov—Durrmeyer算子一致逼近的正定理

给出了Ｂａｓｋａｋｏｖ－Ｄｕｒｒｍｅｙｅｒ算子及其线性组合一致逼近的正定理，利用光滑模ω＾ｒφ＾λ（ｆ，ｔ）（０≤λ≤１），φ（ｘ）＝√ｘ（１＋ｃｘ），ｃ〉０推广宣培才＾［１］导出的结果到一般形式。     

有序Banach空间中两点边值问题的分歧点

考虑有序Ｂａｎａｃｈ空间中形如“ｘ＇＝Ａｘ＋λＢｘ＋ｆ（ｔ，ｘ，λ）（０≤ｔ≤１），Ｐｘ（０）＝Ｑｘ（１）”的两点边值问题，给出了此类问题存在分歧点的某些充分条件。     

关于一种修正的Jacobi多项式

以修正的Ｊａｃｏｂｉ多项式算子的零点作为插值的节点,构造了一个“１／１６”平均插值过程Ｃｎ（ｆ,ｘ）．若ｆ（ｘ）∈Ｃｊ［－１,１］,０≤ｊ≤３,则Ｃｎ（ｆ,ｘ）对ｆ（ｘ）的逼近程度达到最佳,结论为｜Ｃｎ（ｆ,ｘ）－ｆ（ｘ）｜＝Ｏ１ｎｊ＋１＋１ｎｊωｆ（ｊ）,１ｎ（０≤ｊ≤３）｜Ｃｎ（ｆ,ｘ）－ｆ（ｘ）｜＝Ｏωφλｆ,１ｎδｎ（ｘ）１－λ（０≤λ≤１）     

关于一个组合型Bernstein多项式的逼近阶

以Ｊａｃｏｂｉ多项式的零点作为插值的节点,构造了一个组合型的Ｂｅｒｎｓｔｅｉｎ多项式算子Ｃｎ（ｆ,ｘ）．若ｆ（ｘ）∈Ｃｊ［－１,１］,０≤ｊ≤５,则Ｃｎ（ｆ,ｘ）对ｆ（ｘ）的逼近程度均达到最佳。即｜Ｃｎ（ｆ,ｘ）－ｆ（ｘ）｜＝Ｏ１ｎｊ＋１＋１ｎｊωｆ（ｊ）,１ｎ,（０≤ｊ≤５）．     

宇宙微波背景辐射对超高能宇宙线流强的影响

文章指出：（１）在Ｅ＝５＊１０＾１９ｅＶ附近，对所有ｘ（ｘ是宇宙线飞行的距离），超高能宇宙线流强略有增强；（２）在１．０＊１０＾２０ｅＶ≤Ｅ≤５．０＊１０＾２４ｅＶ能区内，宇宙微波背景辐射的作用仅使超高能宇宙线流强有所减弱，在ｘ≤２０００Ｍｐｃ区域内，减弱系数Ｆ（Ｘ，Ｅ）＝ｊ（ｘ，Ｅ）／ｊ（０，Ｅ）≥０．３４。     

多齿映射和多角映射的迭代移位

利用ｘ ∈［０ ,１］ 的ｒ － 进位展开,ｘ ＝ ａ１ｒ ＋ ａ２ｒ２ ＋ …＋ ａｎｒｎ ＋ …　　　ａｎ ∈｛０ ,１ ,…,ｒ － １｝ ,１ ＜ ｒ ∈Ｎ证明了多齿映射Ｓｒ（ｘ） ＝ Ｆｒａｃ（ｒｘ） ,　　０ ≤ｘ ≤１和多角映射Ｔｒ（ｘ） ＝Ｓｒ（ｘ） ,　２ｊ － ２ｒ ≤ｘ ≤２ｊ－ １ｒ ,　ｊ ＝ １ ,２ ,…, ｒ ＋ １２２ｊ － ｒｘ ,　２ｊ － １ｒ ≤ｘ ≤２ｊｒ ,　ｊ ＝ １,２ ,…, ｒ２是移位映射,从而是混沌映射．     

Dedekind函数k次方ψ^k（n）的均值估计

设ψ（ｎ）是Ｄｅｄｅｋｉｎｄ函数，给出了ｋ是自然数且ｋ≥２时的ψｋ（ｎ）的算术均值：ｎ≤ｘψｋ（ｎ）＝ｃ０ｘｋ＋１＋Ｏ（（ｘｌｏｇｘ）ｋ（ｌｏｇｌｏｇｘ）ｋ－１２），ｎ≤ｘ１ψｋ（ｎ）＝ｃ１＋ｃ２ｘｋ－１＋Ｏ１ｘｋ（ｌｏｇｘ）ｋ．     

复合二项K－S算子和PoissonK－S算子逼迫

引入复合二项Ｋａｎｔｏｒｏｖｉｃｈ－Ｓｔｉｅｌｔｊｅｓ算子（Ｓ＿ｒｖ）（ｘ）＝Ｓ＿（ｋ，τ）（ｘ）（τ＞０，０≤ｘ≤１），证明了当τ→＋∞时，（Ｓ＿τｖ）（ｘ）在（０，１］上几乎处处收敛于ｖ关于Ｌｅｂｅｇｕｅ测度的绝对连续部份的Ｒａｄａｎ－Ｎｉｋｏｄｙｍ导数ｆ（ｘ）．同时也证明了ＰｏｉｓｓｏｎＫ－Ｓ算子（Ｓ＿τｖ）（ｘ）＝（τｄｖ）在［ａ，ｂ］（０，＋∞）上也有类似的结论．     

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