有机硅膜对醇—水混合物的渗透汽化分离

在硅橡胶中加入交联剂，制备成有机硅膜．该膜对醇－水混合物具有良好的分离性能，实验表明：交联剂的用量，交联方式均对膜性能有很大的影响，膜内支撑材料和料液浓度对膜的渗透性能也有影响，ＨＶ法和ＲＴＶ法制得的透醇膜对酒精的选择因子分别约为７和５，其通量分别约为１５×１０－３ｋｇ／（ｍ２·ｈ）和４０×１０－３ｋｇ／（ｍ２·ｈ）．     

聚苯胺膜的阴离子交换特性

聚苯胺掺杂电位区（０．２－０．７Ｖ）循环状安图能反映在聚苯胺膜内阴离子特性，Ｃｌ＾－、ＣｌＯ＾－４、ＳＯ＾－２４和ＮＯ＾－３等简单阴离子在膜内可通过电位循环交换。Ｆｅ（ＣＮ）＾３－６／４＾－氧化还原型阴离子可掺入膜内，而呈明显的氧化还原峰（电位０．５，０．４Ｖ），聚苯胺膜可富集和分离Ｆｅ（ＣＮ）＾３－４／４＾－离子。对氨基苯酸磺基团阴离子，在正电位下，可与带正电荷骨架膜静电吸引，还可能有某种不可…     

过渡金属苯丙氨酸希夫碱配合物的合成及表征

合成了５种本丙氨酸希夫碱地渡金属配合物Ｍｎ（Ｓａｌ－Ｐｈｅ）、Ｆｅ（Ｓａｌ－Ｐｈｅ）、Ｃｏ（Ｓａｌ－Ｐｈｅ）、Ｎｉ（Ｓａｌ－Ｐｈｅ）、Ｃｕ（Ｓａｌ－Ｐｈｅ）对配合物进行了热重－差热分析,红外光谱分析、ＸＰＳ分析,测定了配合物的金属含量（ＩＣＰ）对配合物结构进行了初步分析。     

鼠肾脏近曲小管细胞的分离

我们采用改良的胶原酶消化－－密度梯度离心法分离大鼠肾近曲小管细胞，从麻醉的鼠取肾脏置入ＫＨＢ（Ｋｒｅｂｓ－Ｈｅｎｓｅｌｅｉｔ－Ｂｕｆｆｅｒ）液中，去髓质，取出皮质，经胶原酶Ⅰ消化后，用３７％Ｐｅｒｃｏｌｌ分离液（２４０ｇ，５℃，离心１５ｍｉｎ）分离鼠肾近曲小管细胞，并采用ｆｕｒａ－２／Ａｍ测定肾近曲小管细胞浆内游离ｃａ＋＋浓度，其值为：２０１．２２±１４４．６０ｎＭｏｌ（ｎ＝１２）。     

过渡金属苯丙氨酸希夫碱配合物的合成及表征

合成了５ 种苯丙氨酸希夫碱过渡金属配合物Ｍｎ（Ｓａｌ－ Ｐｈｅ）、Ｆｅ（Ｓａｌ－ Ｐｈｅ） 、Ｃｏ（Ｓａｌ－ ｐｈｅ） 、Ｎｉ（Ｓａｌ－ Ｐｈｅ）、Ｃｕ（Ｓａｌ－ Ｐｈｅ）,对配合物进行了热重－ 差热分析、红外光谱分析、ＸＰＳ分析,测定了配合物的金属含量（ＩＣＰ） ,对配合物结构进行了初步分析     

杨树花挥发性成分的GC/MS分析

首次采用同时蒸馏萃取法提取加拿大杨树花的挥发性成分，以ＧＣ／ＭＳ／ＤＳ联用技术分离鉴定了３５种组分，占总峰面积的９５％，其中含量较高的是１－乙氧基丙烷（１４．４４％），乙酸乙酯（１２．９４％），１，１－二乙氧基乙烷（１１．６３％），苯甲醇（５．７５％），２－甲氧基－４－乙烯基苯酚（５．５９％）等。     

沸石膜的合成及渗透气化特性的研究

报道了以硅沸石（Ｓｉｌｉｃａｌｉｔｅ）为原料，添加结晶模板剂ＴＰＡＢｒ（４－ｎ－丙基溴铵）以及碱源（ＮａＯＨ）等，利用水热合成法成功地合成了高硅含量、疏水性硅沸石膜．同时探讨了硅沸石膜对各种含醇水溶液的渗透气化分离特性．研究结果表明：对乙醇／水溶液，供给液乙醇浓度４．７％（ｗｔ）时，透过液乙醇浓度达到７６％（ｗｔ）以上，分离系数αｅ／ｗ）达６５以上；对酒精发酵液，供给液乙醇浓度４．８％（ｗｔ）时，透过液乙醇浓度达到８２％（ｗｔ）以上，分离系数α（ｅ／ｗ）高达９０以上．充分说明了所合成的硅沸石膜对酒精水溶液具有非常高的分离效果．     

高效液相色谱法测定1－硝基蒽醌和1－氨基蒽醌

探讨了１－硝基蒽醌（１－ＮＯ＿２ＡＱ）和１－氨基蒽醌（１－ＮＨ＿２ＡＱ）同时测定和分别测定的色谱条件，提出了在Ｓｈｉｍ－ｐａｃｋＣＬＳＳ－ＳＩＬ色谱柱上，以正庚烷－１，４二氧六环－乙酸乙酯（６５：３５：５（Ｖ／Ｖ）为流动相，流量为１．５ｍｌ／ｍｉｎ，柱温４０℃，以分光光度检测器于２５４ｎｍ处检测时，４ｍｉｎ内使１－ＮＯ＿２ＡＱ与１－ＮＨ＿２ＡＱ分离；５ｍｉｎ使１－ＮＨ＿２ＡＱ与杂质分离；７ｍｉｎ可使１－ＮＯ＿２ＡＱ与杂质分离的高效液相色谱分析法。其绝对检出下限１－ＮＯ＿２ＡＱ为０．０１２μｇ，１－ＮＨ＿２ＡＱ为０．０２６μｇ，变异系数分别为１．１％和０．９６％，回收率分别为９９．７％和１００．２％。     

副交感神经节细胞5─羟色胺去极化反应的离子基础

使用离体细胞内记录，研究了猫副交感性胰腺神经节细胞的５－羟色胺（５－ＨＴ）去极化反应及其离子基础。５－ＨＴ使大部份细胞（４７／５１）产生去极化反应。反应只有两种类型：快去极化（６／４７）及慢去极化（３５／４７），另有６个细胞出现先快、后慢的双相去极化反应；５－ＨＴ导致的快去极化伴有膜电阻减小，向细胞内通以超极化直流电形成条件性膜超极时其幅度增大，提示Ｎａ＋导增大是其离子基础；５－ＨＴ导致的不同细胞的慢去极化分别伴随膜电阻增大、减小或不变，条件性膜超极时其幅度分别增大或不变，提示不是单一离子、而是多种离子参与其形成。分别用低Ｎａ＋、高Ｋ＋溶液灌注神经节，５－ＨＴ慢去极化均明显减小，而低Ｃｌ－溶液则无明显效应，表明Ｎａ＋导增大和／或Ｋ＋导减少是５－ＨＴ慢去极化的离子基础。     

分子筛催化合成乳酸异戊酯的研究

用ＨＺＳＭ－５,Ｍｏ／ＨＺＳＭ－５,Ｆｅ／ＨＺＳＭ－５（３８）分子筛催化合成乳酸异戊酯,以Ｍｏ／ＨＺＳＭ－５分子筛的催化性能最好。当Ｍｏ／ＨＺＳＭ－５分子筛催化剂用量为１ｇ／ｍｏｌ乳酸,乳酸与异戊醇的摩尔比为１：１．２,控制反应温度为１５０℃时,乳酸异戊酯的产率可达９３．８％,催化剂可以回收连续多次使用,在６ｈ内产率仍可保持在９３％左右。     

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.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

<正>~~     

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.     

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     

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。