含发色团的侧链液晶聚硅氧烷的合成及性能研究

采用大分子酯化反应合成了侧链带有发色基团的聚硅氧烷,它们的化学结构被＾１Ｈ－ＮＭＲ,ＩＲ和元素分析所证实,用ＤＳＣ、偏光显微镜和Ｘ－ｒａｙ衍射研究了它们的相转变行为,表明为ＳＡ相。     

中孔分子筛FeMCM－41的合成与表征

水热法直接合成了中孔材料ＦｅＭＣＭ－４１分子筛；通过ＸＲＤ，骨架ＩＲ，ＥＳＲ，紫外漫反射（ＤＲＳ），~２９ＳｉＭＡＳＮＭＲ等测试，表明铁处在分子筛骨架上，同时考察了ＦｅＭＣＭ－４１的热稳定性、吸附量和酸性。     

TS—1沸石合成过程中模板剂用量对钛进入骨架的影响

以ＴＰＡＢｒ为模板剂、ＮＨ３．Ｈ２Ｏ为碱源，水热条件下合成了ＴＳ－１沸石，采用ＸＲＤ、ＩＲ、ＵＶ－Ｖｉｓ、＾２９ＳｉＣＰＭＡＳＮＭＲ、＾２７ＡｌＣＭＡＳＮＭＲ、＾１３ＣＣＰＭＡＳＮＭＲ等表征手段详细研究了模板剂不同用量对钛进入骨架的影响。     

海藻酸钠溶液-Co~(2+)体系溶胶-凝胶相转移的光谱学研究

以１３Ｃ－ＮＭＲ、ＩＲ、ＵＶ和Ｒａｍａｎ光谱学方法研究了海藻酸钠溶液－Ｃｏ２＋体系的溶胶—凝胶相转移过程，结合体系的光谱学分析对体系相转移过程中海藻酸分子链与Ｃｏ２＋的定位方式、分子链的结构与构型变化以及与之紧密相关的溶剂行为进行了定性的剖析．结果表明，体系内部Ｃｏ２＋对海藻酸分子链的交联作用主要发生在羧基官能团上，并存在着自由Ｃｏ２＋与交联Ｃｏ２＋间的迅速的化学交换过程，而溶质溶剂间存在的强烈的相互作用是体系凝胶化的重要条件．     

中孔分子筛FeMCM—41的合成与表征

水热法直接合成了中孔材料ＲｅＭＣＭ－４１分子筛；通过ＸＲＤ，骨架ＩＲ，ＥＳＲ，紫外温反射，＾２９ＳｉＭＡＳ ＮＭＲ等测试，表明铁处在分子筛骨架上，同时考察了ＦｅＭＣＭ－４１的热稳定性，吸附量和酸性。     

N,N—二乙基二硫代氨基甲酸烯丙基酯（ADC）的NMR研究

对Ｎ，Ｎ－二乙基二硫代氨基甲酸烯丙基酯（ＡＤＣ）的＾１Ｈ ＮＭＲ谱，＾１３Ｃ ＮＭＲ谱及Ｈ－＾１Ｈ．＾１３Ｃ－＾１Ｈ化学位移相关谱测定结果进行了讨论。对＾１３Ｃ ＮＭＲ和＾１Ｈ ＮＭＲ谱峰作出了归属，并确认了ＡＤＣ的链结构。     

低然度三甲基丙烯酸三羟甲基丙烷酯的合成

采用在反应过程中加入脱色剂的新的直接酯化法合成了三甲基丙烯酸三羟甲基丙互。产品色度≤３５ＡＰＨＡ，产品收率及纯度分别为９１．９％和９６．４９％。考察了原料（三羟甲基丙烷）的纯度、反应温度等对产品色度的影响，研究了不同脱色剂对产品脱色效果。并对产品进行了ＧＣ、ＩＲ、＾１ＨＮＭＲ、ＭＳ分析。     

用生氧量确定英公水库最佳施肥浓度及比例的试验

用生氧量确定英公水库最佳施肥浓度及比例的试验＊ＡＮＥＸＰＥＲＩＭＥＮＴＯＦＴＨＥＢＥＳＴＣＯＮＣＥＮＴＲＡＴＩＯＮＡＮＤＲＡＴＩＯＯＦＡＰＰＬＶＩＮＧＦＥＲＴＩＬＩＺＥＲＩＮＴＨＥＹＩＮＧＧＯＮＧＲＥＳＥＲＶＯＩＲＤＥＴＥＭＩＮＥＤＢＹＯＸＹＧＯＮＥ...     

Pullulan分子结构的研究

利用ＧＣ－ＭＳ、ＩＲ和＾１３Ｃ－ＮＭＲ对Ｐｕｌｌｕｌａｎ的连接碳位和键型进行了研究,结果表明,Ｐｕｌｌｕｌａｎ分子的主链由β（１→３）糖苷链相连,主链上每２～３个葡萄糖带有一个葡萄糖残基分枝,与主链以β（１→６）链相连,Ｐｕｌｌｕｌａｎ分子上还含有羧基。     

甲醇液相氧化羰基合成碳酸二甲酯研究

研究了不同反应条件下甲醇液相氧化羰基合成碳酸二甲酯（ＤＭＣ）工艺条件，使用ＣｕＣｌ催化剂时，在１１０℃及１．０～１．５ＭＰａ压力下，甲醇转化率为５．９％，甲醇对ＤＭＣ选择性大于９９％．还研究了反应温度、压力、化学组分等因素对合成反应转化率及收率的影响．提高温度和压力能提高转化率及收率．对反应产物进行了ＧＣ，ＮＭＲ及ＩＲ分析．结果表明，产物中ＤＭＣ为主要成分，副产物为少量ＣＯ２及其他烃类副产物，其总量小于５％．使用后的催化剂经ＸＲＤ分析表明，氯化亚铜生成氯化铜（Ⅱ）和氢氧化铜（Ⅱ）是失活的原因之一．     

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.     

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     

WIMAX与WI-FI技术分析及联合组网

介绍了WiMAX与Wi-Fi两种无线宽带接入技术,并对两者之间的关系及相互之间的影响做了对比及分析,并对WiMAX的关键技术进行了详细说明,最后对两者的联合组网方式做了简单的探讨。