二茂铁有机磁性材料的应用

与无机铁氧体比较，以二茂铁为原料，按专利献合成的二茂铁有机磁体在广泛的温度范围内磁性能十分稳定，在10—1800MHz的高频、微波下，磁导率(μ′)和磁损耗(μ″)基本不随使用频率而变化，应用研究表明，它是一类新型的软磁材料，适于制作许多高频和微波电子器件。     

丙烯酸改性二茂铁型高分子磁体的电磁性能研究

用丙烯酸对二茂铁型高分子磁体 (以下简称高分子磁体 )进行改性 ,研究了高频微波下改性高分子磁体的频率—磁导率—磁损耗 (f μ′ μ″)及频率—介电常数—介电损耗 (f ε′ ε″)的关系 .研究结果表明 :丙烯酸改性的高分子磁体具有较高的介电常数 (ε′)、较低的介电损耗 (ε″)和磁损耗 (μ″) ,这对电子器件的小型化有重要价值 .     

响应曲面法优化二茂铁基双甲酰肼的微波辅助合成工艺

本研究采用微波辐射技术简便、快速、高效合成1,1′-二茂铁双甲酰肼(d)。为了提高其产率,分别以1,1′-二茂铁双甲酸甲酯和80%水合肼的物料比,微波输出功率和微波辐射加热时间为单因素进行考察,利用响应曲面法进行合成工艺的优化。研究结果表明:1,1′-二茂铁双甲酸甲酯和80%水合肼的物料比为2∶5,微波输出功率为100 W,微波辐射加热反应时间为15 min为其最佳合成工艺条件,产率可达91.7%。     

两个新的二茂铁基席夫碱衍生物的合成、表征及电化学性质

以二茂铁间(对)苯胺为原料，合成了两个新的二茂铁基席夫碱衍生物FcL1[N-(2-羟基亚苄基)-3-二茂铁基苯胺]和FcL2[N-(2-羟基亚苄基)-4-二茂铁基苯胺]，通过元素分析，IR，UV和^1HNMR光谱分析等确证了标题化合物的结构．电化学研究表明：FcL1和FcL2的电化学性质相似，亚胺基团的引入显著影响了二茂铁的式量电位，同时，茂环上取代基的氧化会导致电极的钝化．此外，利用多种电化学手段测定了标题化合物在CH3CN中的扩散系数(D)和标准电极反应速率常数(ks)．     

酞菁-二茂铁型高分子吸波材料的合成与表征

以聚1,1'-二乙烯基二茂铁为原料,通过Friedel-Crafts反应引入酞菁铁,用元素分析、IR、TGA及其μ′、μ″、ε′、ε″电磁参数对这种新型吸波材料进行表征,并初步分析了该聚合物的结构与微波吸收性能,为合成新一代轻质及红外兼容的高分子微波吸收材料提供理论依据.     

簇合物Co6(μ3-S)2(μ4,η2-SPR)(CO)14(R=Fc,naphthyl

用P2S5分别与萘和二茂铁反应，得到两种配位基前体：(L1，C10H7为naphthyl萘基)和(L2，Fc为二茂铁基).L1和L2分别与Co2(CO)8反应，得到两种新的含S、P桥基的六核钴羰基簇合衍生物：Co6(μ3-S)2(μ4,η2-SPC10H7)(CO)14(Ⅰ)和Co6(μ3-S)2(μ4,η2-SPFc)(CO)14(Ⅱ).L1与Ru3(CO)12反应得到Ru3(μ3-S)(μ-H)2(CO)9(Ⅲ)和Ru4(μ3-S)(μ3-PC10H7)(CO)10(Ⅳ).通过元素分析和谱学表征，对簇合物Ⅰ～Ⅳ的结构进行了推测.     

微波辐射下合成二茂铁基查尔酮

报道了在微波辐射条件下,以乙醇为溶剂,固体氢氧化钠为催化剂,使芳醛与乙酰基二茂铁反应合成二茂铁基查尔酮.该法具有反应时间短、产率较高和操作简便等特点.     

微波与FIA联用对药物中维生素C的快速测定

首次利用实验室自制的微波流动注射分析仪，基于微波场对Ｖｃ与钼酸钠反应的加速作用，建立了测定了Ｖｃ的微波流动注射分析新方法，其线性范围，检测限和分析速度分别为５．００－８０．００μｇ／ｍｌ，２．００μｇ／ｍｌ和４０次／ｈ 。该方法已用于Ｖｃ针剂中Ｖｃ的定量测定，回收率在９３．６％－１０４．４％之间。     

二茂铁基氨基醇汞(Ⅱ)配合物的合成与表征

合成了3种二茂铁基氨基醇2-羟基-2-二茂铁基丙胺(FcM)、2-羟基-2-对甲氧苯基-2-二茂铁基乙胺(Fcp-MOB)、2-羟基-2-对氯苯基-2-二茂铁基乙胺(Fcp-CIB)，使之分别与氯化汞反应，生成3种新型汞(Ⅱ)配合物Hg(FcM)Cl2、Hg(Fcp-MOB)Cl2、Hg(Fcp-ClB)Cl2．通过元素分析、红外光谱、核磁共振氢谱、差热-热重分析和摩尔电导，对新配合物的组成、结构和性质进行了表征，并初步确定了配合物的结构．     

二茂铁衍生物电催化氧化NADH及催化速率常数的测定

用微盘电极研究了二茂铁衍生物的电化学行为及电催化氧化二氢烟酰胺腺嘌吟二核苷酸（ＮＡＤＨ）。用微电极测定了二茂铁衍生物（磺酸基二茂铁，乙酰基二茂铁，羧酸基二茂铁，α－羟乙基二茂铁，α，α＇－二经乙基二茂铁）的扩散系数（分别为３．４×１０￣（－６），６．９×１０￣（－６），１．７×１０￣（－６）．６．２×１０￣（－７），１．５×１０￣（－６）ｃｍ￣２／ｓ）及乙酞基二茂铁电催化氧化ＮＡＤＨ的催化速率常数（４．６８×１０￣３（ｍｏｌ／Ｌ）￣（－１））。探讨了温度、ｐＨ及β－环糊精的络合效应对催化反应的影响。     

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.     

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.     

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