双-{N-[2-脱氧-β-D-吡喃葡糖-2-(3-甲酰基水杨酸胺)]} 金属合物及其金属胶束催化PNPP水解动力学

作者合成和表征了双－｛N-[2-脱氧－β－D－吡喃葡糖－2－（3－甲酰基水杨酸胺）]｝M2（Ⅱ）配合物（M＝Cu,Zn,Co）；研究了该双核金属配合物在CTAB胶束溶液中催化PNPP水解反应动力学；用双核复合物金属胶束的三元复合动力学模型对实验结果进行了定理处理，结果表明：配合物在CTAB胶束溶液中形成金属胶束后，催化水解的能力明显增强，可使反应速率提高几百倍至二千多倍，金属配合物催化水解的速率常数大小顺序为Cu(Ⅱ），Zn（Ⅱ）和Co(Ⅱ)。     

微波辐射下交联壳聚糖树脂的制备及其吸附性能

在稀醋酸溶液中，微波辐射下壳聚糖与Zn^2 反应制备了壳聚糖Zn^2 配合物，然后将制得的配合物与环氧氯丙烷在微波辐射下进行交联反应后，用稀酸除去Zn^2 ，合成了具有Zn^2 离子孔穴的交联壳聚糖树脂。实验考察了该树脂对一些金属离子的吸附性能，并对影响树脂吸附性能的因素进行了研究。     

两个Cu（Ⅱ）配位超分子的研制及光物理性质

采用水热和溶剂热方法合成了2个Cu（Ⅱ）配合物：[Cu（C3H2O4）（phen）（H2O）]2·3H2O（1）和[Cu（inic）2（H2O）3]·H2O（2）（phen=邻菲啰啉;inic=异烟酸根）.通过单晶X射线衍射、IR、UV-Vis-NIR吸收光谱、表面光电压光谱（SPS）对其进行了结构表征和物性测试.结构分析表明,2种配合物均为单核Cu（Ⅱ）配合物.配合物（1）中Cu（Ⅱ）离子为五配位,配位环境为畸变的四方锥构型;配合物（2）中Cu（Ⅱ）离子为五配位,配位微环境为畸变的四方锥构型.丰富的分子间氢键将它们网联成了2D配位超分子.2种配合物的SPS在300～800nm范围内都呈现出正的表面光伏响应,表明它们都具有一定的光电转换能力.分析讨论了2种配合物的电子光谱和SPS谱.     

TiO_2-KNO_3溶液界面吸附Cu(Ⅱ)的动力学特征

本文通过用BAM理论处理吸附动力学数据，得出Cu（Ⅱ）在TiO2-KNO3溶液界面上的吸附过程由液膜扩散所控制，吸附反应级数为一级．     

粘土-壳聚糖复合吸附剂吸附铬(Ⅵ)离子性能的研究

通过壳聚糖与粘土的结合，制备出复合吸附剂，并研究其对Cr（Ⅵ）离子的吸附性能．研究结果表明，与单一的粘土或壳聚糖相比，该吸附剂对Cr（Ⅵ）离子吸附速度快、吸附能力强．吸附除去Cr（Ⅵ）的最佳工艺条件是：壳聚糖与粘土质量比为0．04，pH值4～6，Cr（Ⅵ）离子的质量浓度≤10mg／L，吸附平衡时间为40min，吸附荆用量为8．0g／L．     

壳聚糖—Cu(Ⅱ)配合物对尿素的吸附

研究了利用天然高分子聚合物壳聚糖与Ｃｕ（Ⅱ）的配合物配位吸附尿素的方法。结果表明：当配合物中含铜质量分数为６．５％,溶液ｐＨ＝６．０时吸附尿素效果最好。当尿素原液质量浓度为１３００．０ｍｇ／Ｌ,吸附时间８．０ｈ时,吸附量可达８３．６ｍｇ／ｇ。     

3,5—diBr—PADAP—Triton X—100光度法测定微量铜

本文系统研究了在表面活性剂TritonX－100存在下，3，5—diBr—PADAP与Cu（Ⅱ）的显也反应性能，提出了测定微量铜的新方法．在pH3．5HAc－NaAc缓冲液中，Cu（Ⅱ）与3，5-diBr-PADAP形成1：2配合物，其最大吸收波长为573nm，表观摩尔吸光系数为8．5×104，Cu（Ⅱ）含量在0～4μg／10ml范围内服从比耳定律．在确定条件下，大量金属离子不干扰，反应有较好的选择性．方法直接用于铝合金中微量铜测定，结果满意．     

D-葡萄糖胺西佛碱金属配合物金属胶束催化PNPP水解反应动力学的研究

合成了[N-(2-脱氧－β-D-吡喃葡糖－2－水杨醛胺）]M（Ⅱ）单核金属配合物（M=Cu,Zn,Co,Ni)，使用分光光度法研究了该单核的在CTAB胶束溶液中催化PNPP水解反应动力学，用单核配合物金属胶束的三元复合动力学模型对实验结果进行了讨论。实验结果表明：这类配合物在CTAB胶束溶液中形成金属胶束后，催化水解的能力明显增强，在中性或偏碱性环境中对PNPP的水解具有很好的催化活性，且金属配合物催化水解的速率常数其大小顺序为Zn(Ⅱ),Cu(Ⅱ),Co(Ⅱ),Ni（Ⅱ）。     

一维配位聚合物{[Cu（tzda）（H2O）3]·3．5H2O}n的合成、晶体结构及电化学性质

合成了一维配位聚合物{[Cu（tzda）（H2O）3]·3．5H2O}n（H2tzda为1,3,4-噻二唑-2,5-二硫代乙酸）,对其结构进行了红外、元素分析和X射线单晶衍射测定．配合物属单斜晶系,空间群C2／c,晶胞参数a=1．9073（12）nm,b=0．7134（4）nm,c=2．3635（15）nm,β=91．3780（10）°,Z=8．金属中心Cu（Ⅱ）离子呈现出五配位,处于四角锥的配位环境;配体阴离子tzda2-采用双（单）齿配位模式将Cu（Ⅱ）离子连接成一维链状结构．配合物的电化学研究表明：在-0．3—0．4V电位范围内,Cu2＋／Cu＋电对在电极上的氧化还原反应过程是准可逆过程且受扩散控制．     

壳聚糖对铬（Ⅱ）离子吸附作用的研究

研究了壳聚糖对铬（Ⅲ）离子的吸附性能,测定了吸附等温线的吸附动力学曲线。实验结果表明壳聚糖对铬（Ⅲ）离子有较强的吸附能力。吸附率受ｐＨ值影响较大,在此基础上,通过ＩＲ,ＵＶ,ＳＥＭ等检测手段证实铬（Ⅲ）离子与壳聚糖之间发生了配位作用。     

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

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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。