芳基磺酰氨基丙基杂氮硅三环化合物的合成及生物？…

杂氮硅三环是具有特殊结构和显著生物活性的有机硅化合物，在杂氮硅三环化合物中引入磺酰基，合成了８个芳基磺酰氨基丙基杂氮硅三环化合物，经ＩＲ，＾１ＨＮＭＲ，ＭＳ及元素分析确定了它们的结构，初步的生物活性测试表明：所有的目标化合物对金黄色葡萄球菌都有抑制作用，其中活怀较好的为侧链胺基氨原子未被完全取代的化合物。     

取代杂氮硅三环化合物的合成及其反应研究

通过取代三烷氧基硅烷与三乙醇胺的酯交换反应合成了４个１－取代杂氮硅三环，以氯丙基杂氮硅三环与亚磷酸酯进行Ａｒｂｕｚｏｖ反应得到２个含磷酰基的杂氮硅三环。氨丙基杂氮硅三环与芳醛的缩合反应得到４个含芳亚甲氨基丙基的杂氮硅三环化合物，对所合成化合物的结构进行了表征，并对反应条件作了初步探讨。     

二烷氧基磷酰胺基丙基杂氮硅三环衍生物的合成

杂氮硅三环化合物不仅具有特殊的分子结构 ,而且具有显著的生物活性 ,可用作杀菌剂、杀虫剂[1～ 3] ,某些化合物还具有抗肿瘤性能等[4 ] .近年以来 ,人们十分关注杂氮硅三环衍生物的研究与进展 .含有磷酰基的化合物通常具有很强的生物活性 ,很多是非常有效的有机磷农药[5] .根     

γ-氨丙基杂氮硅三环的合成、表征及其摩擦性能

合成了γ－氨丙基杂氮硅三环作为一种新型水溶性金属加工液添加剂，并用红外及热分析表征了其结构，用四球摩擦实验机探讨了γ－氨丙基杂氮硅三环的摩擦学性能。实验证明所合成的化合物为γ－氨丙基杂氮硅三环，其作为环保型水基金属加工液添加剂具有一定的减摩抗摩性能。     

具有生物活性的杂氮硅三环类化合物的理论研究

用量子化学ＭＮＤＯ方法研究了杂氮硅三环类化合物的电子结构和化学健以及结构与生物活性的关系。结果表明，偶极矩与毒性的关系以及ＬＵＭＯ是定域于Ｒ－Ｓｉ键的反键ａ轨道，Ｒ－Ｓｉ是一个弱键，它的断裂速度与杂氮硅三环类化合物的毒性相关联。     

杂氮硅三环类化合物的结构与毒性

用量子化学ＡＭ１方法研究杂氮硅三环类化合物的电子结构，化学键和结构与毒性的关系．获得该类化合物的毒性与Ｒ－Ｓｉ反键σ轨道能级密切相关的满意结果     

1─苯基杂氮硅三环的从头计算研究

本文用量子化学从头计算方法研究了１－苯基杂氮硅三环的电子结构和化学键．基集包括了硅原子的收缩的ＳＴＯ－３Ｇ的３ｄ轨道，研究结果表明：硅的３ｄ轨道对形成苯环与硅之间的σ，л相互作用和Ｎ→Ｓｉ配键均有重要贡献     

影响红外光谱峰位变化的因素之一——氢键形成的新因素

本文从N—二茂铁酰胺酸,杂氮硅三环化合物和邻位取代的苯甲酸类物质的红外光谱的变化,提出精细结构、空间位阻、湿度和状态等是影响氢键形成的新因素。     

1—苯基杂氮硅三环的从头计算研究

本文用量子化学从头计算方法研究了１－苯基杂氮硅三环的电子结构和化学键。基集包括了硅原子的收缩的ＳＴＯ－３Ｇ的３ｄ轨道，研究结果表明：硅的３ｄ轨道对形成苯环与硅之间的σ，π相互作用和Ｎ→Ｓｉ配键均有重要贡献。     

四氮杂环蕃分子识别及红外光谱研究

目的合成四氮杂环蕃CP44并对二茂铁或氮杂环化合物进行分子识别,研究其红外吸收光谱。方法用高度稀释法合成了1,6,16,21-四氮杂[6．1．6．1]对环蕃CP44,在酸性条件下与具有生物活性的咪唑类或二茂铁氮进行反应,IR和MS对包结物的结构进行测定。结果得到7个主-客体包结物。结论由IR中N-H伸缩频率可以研究四氮杂环蕃与含氮杂环的分子识别行为。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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.     

英文诗歌中的喻类修辞

为了有助于提高英文爱好者的个人情操、文化素养和学习兴趣,以及专业人员对英语学习和研究进行多途径的探索,本文通过一些精选诗歌的引证和分析,着重论述了喻类修辞法在英文诗歌中的运用其及效果。     

Man Is Unable to Change the Miserable Life——Analysis of the Arrangement of Four Characters in The Glass Menagerie

Tennessee Williams is considered as one of the most important American playwrights since World War II.The Glass Menagerie is his first successful drama,which describes a tragic situation of family and means to say that Man is unable to change the miserable life,no matter whatever means he try,This essay focuses on the analysis of the arrangement of the four main characters:Laura.Amanda,Jim and Tom to reveal the theme.Laura is fragile.Amanda is brave.Jim is vital.Tom is sensible.And all of them develop and try the different means to struggle against life,but fail tragically.With the evidence,the paper comes to conclusion naturally that Man is unable to change the miserable life,and he dooms to fail.     

Characterization of root-nodulating bacteria on Retama raetam in arid Tunisian soils

The aim of this study is to investigate the diversity of Retama raetam root-nodule bacteria isolated from arid regions of Tunisia. Twelve isolates, chosen as representative for different 16S rRNA gene patterns, were characterized by 16S rRNA gene sequencing and phenotypic analysis. Isolates were assigned to Sinorhizobium, Rhizobium and Agrobacterium. Symbiotic properties of Sinorhizobium and Rhizobium isolates showed a large diversity in their capacity to infect their host plant and fix atmospheric nitrogen. Strain RK 22 identified as Rhizobium was the most effective isolate.     

An Affordable Accurate Evaluation of the Binding Conformations Predicted by Molecular Docking Studies in Bio-System

正Recently,docking has been widely used to predict the binding-modes of protein-inhibitors,when the crystal complexes structure was absent.Most docking algorithms are able to generate a large number of probable conformations,it,however,is difficult to effectively evaluate these docking poses and identify the most reasonable bindingmode.In the present study,on the basis of the crystallographic data of human 3-hydroxy-3-methylglutaryl coenzyme