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。     

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     

基于VerilogHDL的分频器的优化设计

基于整数和小数分频的实现原理,提出了整数和小数分频器的算法和结构,采用Verilog硬件描述语言优化设计了偶数、非50%占空比和50%占空比的奇数、半整数分频器,重点对任意小数分频器进行了设计优化.用LDV5.1进行了仿真,用Synplify Pro进行了基于ALTERA公司FPGA的综合,证明了其可行性.     

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.     

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.     

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.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.