Sm（ClO4）3—Ala—H2O三元体系在35℃时的相平衡研究

测定了Ｓｍ（ＣｌＯ４）３－Ａｌａ－Ｈ２Ｏ三元体系在３５℃时的溶解度和饱和溶液２折光率，构制了相应的溶解度图和饱和溶液折光率曲线。溶解度曲线与折光率曲线均由４支组成，分别与Ｓｍ（ＣｌＯ４）３．８Ｈ２Ｏ，Ｓｍ（Ａｌａ）４（ＣｌＯ４）．２Ｈ２Ｏ（Ａ），ｓｍ（Ａｌａ）３（ＣＯ４）３．３Ｈ２Ｏ（Ｂ）和Ａｌａ的晶体相对应。     

化学需氧量COD_（Cr）测定条件改进的研究

本文提出以Ａｇ２ＳＯ４—Ａｌ２（ＳＯ４）３—ＭｇＳＯ４作催化剂，在Ｈ２ＳＯ４－Ｈ３ＰＯ４混酸溶液中快速测定废水ＣＯＤ的新方法．实验确定的最佳条件是：Ａｇ２ＳＯ４：Ａｌ２（ＳＯ４）３：ＭｇＳＯ４＝１∶１∶１（质量比），Ｈ２Ｏ４：Ｈ３ＰＯ４＝５∶１（体积比），回流时间０．５小时，通过对废水ＣＯＤ的测定，取得与标准法相近的结果．     

Cu—Mn—Pt／γ—Al2O3系列催化剂中组分间的活性增强效应

通过ＣＯ氧化活性测试，采用ＸＲＤ、ＸＰＳ、ＴＰＲ等方法表征，研究了Ｃｕ－Ｍｎ－Ｐｔ／γ－Ａｌ２Ｏ３系列催化剂中组分间的活性增强效应，并对其固相结构和表面组成进行表征．结果表明：（１）氧化型ＣｕＭｎ／γ－Ａｌ２Ｏ３催化剂中Ｃｕ和Ｍｎ之间存在一定的活性增强效应，两种活性组分发生协同作用；（２）还原型Ｐｔ－Ｃｕ／γ－Ａｌ２Ｏ３和Ｐｔ－Ｍｎ／γ－Ａｌ２Ｏ３催化剂的氧化活性在系列中最高，Ｐｔ－Ｍｎ／γ－Ａｌ２Ｏ３的ＣＯ氧化活性增强效应最为显著．这与加人Ｐｔ后，Ｃｕ２＋易被还原，Ｃｕ＋明显增多有关；（３）同时含有Ｃｕ、Ｍｎ组分的几种催化剂中，催化剂表面上Ｃｕ均有一定富集，加人Ｐｔ后，表相以Ｃｕ＋为主．由于Ｃｕ－Ｍｎ－Ｐｔ三元催化剂的制备方法不同，以致氧化活性相差很大，共浸制备较分浸制备的催化剂活性要好的多．     

La0.8Sr0.2MnO3＋λ负载于α,γ—Al2O3上作为燃烧催化剂的研究

Ｌａ０．８Ｓｒ０．２ＭｎＯ３＋λ负载于α,γ－Ａｌ２Ｏ３上作为燃烧催化剂的研究高丽蓉,孙燕华,沈岳年（内蒙古大学化学系,０１００２１,呼和浩特）ＳｔｕｄｉｅｓｏｎＬａ０．８Ｓｒ０．２ＭｎＯ３＋λＬｏａｄｉｎｇｏｎα,γ－Ａｌ２Ｏ３ａｓａＣｏｍｂｕｓｔ...     

甲醇脱氢制备甲酸甲酯的催化性能研究

将浸渍法制备的Ｃｕ／ＳｉＯ２、Ｃｕ－ＺｎＯ／ＳｉＯ２、Ｃｕ－ＺｎＯ－ＺｒＯ２／ＳｉＯ２,以及Ｃｕ／γ－Ａｌ２Ｏ３、Ｃｕ－ＺｎＯ／γ－Ａｌ２Ｏ３、Ｃｕ－ＺｎＯ－ＺｒＯ２／γ－Ａ六种催化剂应用于甲醇脱氢制甲酸甲酯反应。实验结果表明,以Ａｌ２Ｏ３为载体的催化选择性较差且易积炭失活;加有ＺｎＯ助催化剂的Ｃｕ－ＺｎＯ／ＳｉＯ２性能优于末加助催化剂的Ｃｕ／ＳｉＯ２;加有权助催化剂的Ｃｕ－Ｚｎ－ＺｒＯ２／Ｓｉ     

氧化镍在γ－Al_2O_3和TiO_2－Al_2O_3上的分散状态研究

采用浸渍法制备了系列ＮｉＯ／γ－Ａｌ２Ｏ３，ＮｉＯ／ＴｉＯ２－Ａｌ２Ｏ３催化剂样品，用ＸＲＤ，ＥＸＡＦＳ等方法对这些样品进行了分析．ＸＲＤ相定量方法测得ＮｉＯ在γ－Ａｌ２Ｏ３载体上的最大分散量为０．０６５ｇＮｉＯ／１００ｍ２Ａｌ２Ｏ３，而ＮｉＯ在ＴｉＯ２－Ａｌ２Ｏ３载体上的最大分散量为０．０８１ｇＮｉＯ／１００ｍ２ＴｉＯ２Ａｌ２Ｏ３。ＥＸＡＦＳ分析结果表明：ＴｉＯ２的引入改变了ＮｉＯ在载体表面上的分散状态．     

Cl~- 和 SO_4~(2-) 对厌氧废水处理的抑制阈值

用人工配制高浓度有机废水分别研究了Ｃｌ－和ＳＯ２－４对厌氧生物废水处理的抑制作用和抑制阈值．在全混流厌氧恒化器和上流式厌氧污泥床（ＵＡＳＢ）反应器中分别得到了对厌氧消化基本无抑制作用（全混流恒化器：Ｃｌ－＜４．５ｇ／Ｌ,ＳＯ２－４＜１．８ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＜７．２ｇ／Ｌ,ＳＯ２－４＜３．０ｇ／Ｌ）;轻度抑制（全混流恒化器：Ｃｌ－＝４．５～６．０ｇ／Ｌ,ＳＯ２－４＝１．８～３．３ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝７．２～８．２ｇ／Ｌ,ＳＯ２－４＝３．０～４．１ｇ／Ｌ）;中度抑制（全混流恒化器：Ｃｌ－＝６．０～１３．８ｇ／Ｌ,ＳＯ２－４＝３．３～６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＝８．２～１０．０ｇ／Ｌ,ＳＯ２－４＝４．１～６．０ｇ／Ｌ）和重度抑制（全混流恒化器：Ｃｌ－＞１３．８ｇ／Ｌ,ＳＯ２－４＞６．５ｇ／Ｌ;ＵＡＳＢ：Ｃｌ－＞１０．０ｇ／Ｌ,ＳＯ２－４＞６．０ｇ／Ｌ）的不同Ｃｌ－和ＳＯ２－４浓度范围．     

铜基甲醇合成催化剂的EPR表征

用ＥＰＲ谱法对铜基甲醇合成催化剂作表征。结果表明：在少量Ａｌ￣（３＋）掺杂的ＺｎＯ－Ａｌ＿２Ｏ＿３体系可检测到ｇ＝１．９６０６±０．０００２，△Ｈｐｐ＝２．８Ｇ的顺磁信号，其强度随Ａｌ＿２Ｏ＿３掺杂量增加而增强，当Ａｌ／Ｚｎ～２／１００（原子比）时趋于峰值；而在三组份Ｃｕ－ＺｎＯ－Ａｌ＿２Ｏ＿３和四组份Ｃｕ－ＺｎＯ－Ａｌ＿２Ｏ＿３－Ｓｃ＿２Ｏ＿３催化剂体系中，此顺磁信号基本消失。以上结果为三价金属离子（Ａｌ￣（３＋）、Ｓｃ￣（３＋））在ＺｎＯ晶格掺杂诱生正一价缺位从而有利于Ｃｕ以＋１价态存在的观点，提供了新证据。     

水滑石及柱撑水滑石的制备和表征

制备了水滑石Ｍｇ６Ａｌ２（ＯＨ）１６ＣＯ３．４Ｈ２Ｏ和类水滑石Ｍｇ４Ａｌ２（ＯＨ）１２（ＮＯ３）２．４Ｈ２Ｏ，Ｚｎ６Ａｌ２（ＯＨ）１６ＣＯ３．４Ｈ２Ｏ它们的晶体结构基本相似，热稳定性都不很高，２００℃时将失去全部结晶水，２００～４５０℃时将失去全部层间阴离子，以及大部分ＯＨ＾－。用离子交换法和共沉淀法制轩了１，５－二萘磺酸柱撑水滑石Ｍｇ４Ａｌ２（ＯＨ）１２（Ｃ１０Ｈ６（ＳＯ３）２）．４Ｈ２Ｏ，其层     

CuO/Cr2O3/Al2O3催化剂上1,4-丁二醇脱氢合成γ-丁内酯

在固定床反应器上研究了ＣｕＯ／Ｃｒ２Ｏ３／Ａｌ２Ｏ３催化剂常压１,４－二醇催化脱氢合成γ－丁内酯的反应,γ－丁内酯的产率可达９９％以上,用Ｘ射线粉末衍射法（ＸＲＤ）、扫描电镜法（ＳＥＭ）、比表面及孔容测定法（ＢＥＴ）等手段对催化剂进行了表征,结果表明,Ｃｕ＾０为催化剂的脱氢活性中心,Ｃｒ的存在促进Ｃｕ在载体表面的高度分散,并与Ｃｕ形成ＣｕＣｒ２Ｏ４固溶体,提高了催化剂的活性及选择性。     

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

<正>~~     

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。