加权环簇的轨形结构

环簇和轨形在数学和物理中具有广泛的联系.单纯环簇实际上就是一类具有良好结构的轨形.作者通过推广扇集和环簇之间的对应,定义了加权扇集和加权环簇,并给出了它们之间的对应.然后,作者讨论了加权环簇的性质,并证明了单纯加权环簇也具有轨形结构.     

轨形上的广群、丛束和周期磁单极定理

证明了每个平凡丛束都是可微广群,将流形上周期磁单极对应推广到轨形上,证 明 了 Ｇ 主轨丛的回路丛是ＦｒéｃｈｅｔＬＧ主丛,并且还在轨形上引入了 Ｃ× 广群、丛束的概念,从而推广了一些流形上的结论．      

四辊万能孔型中轨形件宽展的数值解

根据轨形件的形状特点和其在四辊万能孔型中变形特征，简化了其断面形状，并划分成７个区域．建立了各区的运动许可速度场，得到含５个变分参数总功率泛函表达式．由泛函极小化条件，用Ｐｏｗｅｌ算法，求解出轨形件头部和底部宽展的数值解．计算表明，头与底部宽展规律不同，理论值与实测值的吻合较好     

从卡-丘空间到轨形拓扑

当今弦理论最美妙的运用是卡－丘空间,但成千上万种的卡－丘空间也带来选择的困境,而类似的难题都能通过黎曼切口和轨形拓扑等数学思想,组织、纳入宏大而系统的三旋理论框架给予解决。     

轻轨CARD系统孔型设计模型

研究了轻轨ＣＡＲＤ系统孔型设计数学模型的建立方法,在总结和分析大量现场数据的基础上,用回归分析建立了轻轨ＣＡＲＤ系统轨形孔孔型设计模型,并成功的用在轻轨ＣＡＲＤ系统的开发中,经厂家试用效果很好。     

旧重轨轧制轻孔型系统的设计

从重轨和轻轨的断面特点了，在试验的基础上，提出了万能轧腰变形的方法、成功地解决了旧重轨轧制轻轨过程中压高变的难题。为此，设计了一套由轧腰孔型系统和轨形孔形系统组成的旧重轨轧制轻轨孔型系统，并获得符合标准的２４ｋｇ／ｍ轻轨实样。     

轨形与弦拓扑

轨形理论是近数十年来发展起来的一个交叉性数学课题,与许多不同的数学分支如代数几何、微分几何、拓扑、代数及弦理论相关。本书是关于这个理论的引论,给出了它的基本概念、主要结果以及来自代数几何、代数拓扑及几何学的基本技术,特别给出许多来自代数几何和弦理论的例子,核心内容是Chen．Ruan上同调的精细刻划,并且将统理论作为这个研究的一个主要动因。     

新型的门禁系统结构的设计

在屏弃了传统的通讯单一化,或者无网络单点刷卡门禁系统结构的同时,将射频网络、GSM网络及以太网引入到了门禁系统中,形成了2级网络结构,极大的增强了系统的适应性,提高了性价比。初级网络采用资源丰富的ATMEGA128L作为主控器,次级网络由ATMEGA16L负责控制,并采用了自动请求重传机制,保证通讯的可靠性。     

选煤厂的煤泥水的治理

本文通过对难沉煤泥水的煤泥特性的分析,通过采用新型的絮凝剂,改善了浓缩机的沉降效果,缩短了压滤机的压滤时间,最终实现了全厂的洗选闭路循环,保证了选煤厂的正常生产。     

数字图书馆的概念与内涵的研究

简要介绍了数字图书馆的发展 ,对数字图书馆的定义进行了概括 ,指出了信息资源数据库群建设的重要性和方法 ,肯定了数字图书馆的发展趋势 ,指出了数字图书馆建设是涵盖广泛学科及技术领域的漫长过程 ,提出了数字图书馆资源建设的必要性、重要作用及规范标准 ,设想了数字图书馆应当建设的一些数据库 ,拟出了国家支持建立无偿数据库的思路和行业自行建立有偿数据库的思路     

Orbifold嵌入定理

证明了orbifold嵌入定理在高维的orbifold上成立,即对于一紧致复orbifold M,若其上有一个正定的线丛,则存在正整数N使得M可以拓扑嵌入到CPＮ.     

一类局部orbifold Gromov-Witten不变量的计算

Gromov-Witten不变量是研究辛几何、代数几何的重要工具.对于一般流形,它的Gromov-Witten不变量的计算则是一项艰巨的任务,现在常用的计算方式一是利用流形的退化及退化公式,一是利用局部化技巧,以及两种方法混合.本文作者利用维数分析和局部化技巧将所考虑的orbifold Calabi-Yau模型Ws={(x,y,z,w)×[p,q]∈C4 × P1 |x/z=w/y=p/q}/μr(1,-1,b,-b)上的3-点orbifold Gromov-Witten不变量的计算简化到一些特殊的不变量的计算,并计算了其中一类.     

Orbifold上的积分

Orbifold的研究源于SATAKE对V-manifold的讨论．作者通过orbifold在一点附近的性质导出了带边区域的定义，还具体的构造出orbifold上的外微分形式丛，最后证明了对orbifold上的紧支集外微分形式Stokes公式成立。     

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.     

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