FMS—AGV传输系统自学习调度方法

针对ＦＭＳ－ＡＧＶ传输系统调度的不确定性因素,对ＡＧＶ在线运行状态参数实时记录并学习,运用动态规划算法和模糊数学的方法,提出了模糊动态规划（ＦＤＰ）算法．给出了适于计算的迭代算式,结合人工智能（ＡＩ）编制了ＡＧＶ传输系统调度软件包．本算法利用在线记录的ＡＧＶ运行数据进行模糊处理和学习,有效地调节用于描述ＦＤＰ算法的模糊模型参数．这种自学习ＦＤＰ算法在ＡＧＶ的路径规划中有较好的适应性．对于一个新的ＦＭＳ－ＡＧＶ系统,经几次规划自学习之后,该算法就能很好地用于系统的实时调度中．     

PVDF压电薄膜的应用进展

ＰＶＤＦ（Ｐｏｌｙｖｉｎｙｌｉｄｅｎｅ ｆｌｕｏｒｉｄｅ，聚偏氟乙烯）压电材料具有独特的热电效应和压电效应，是一种新型的高分子多功能材料。ＰＶＤＦ压电薄膜由于制作成本低、容易加工和处理、重量轻、机械性能好等优点，在诸多领域的应用受到人们的广泛关注。本文从力和输出的关系、温度与输出电压的关系以及动态响应关系三个方面，综述了ＰＶＤＦ压电薄膜的机械、公路交通、建筑、医学、航空航海等方面的最新进展，并分析     

TNFα在登革病毒感染发病机制中作用的实验研究

以正常人和脐带血人单核细胞作为登革Ⅱ型病毒（Ｄ２Ｖ）感染的靶细胞，研究了肿瘤坏死因子α（ＴＮＦα）对Ｄ２Ｖ复制的影响以及人单核细胞感染Ｄ２Ｖ后ＴＮＦα产生能力的变化，动态观察了６６例登革感染病人不同发病天数血清中ＴＮＦα水平．结果表明ＴＮＦα能增加Ｄ２Ｖ的复制（Ｐ＜０．０５），高剂量Ｄ２Ｖ（１００ｐｆｕ／ｃｅｌ）感染能引起人单核细胞产生ＴＮＦα，病人血清中ＴＮＦα水平明显升高（Ｐ＜０．０５）．结果提示ＴＮＦα促进登革病毒感染．     

一种固体介质中空间电荷分布测量的新方法

压电压力波法是用聚偏氟乙烯（ＰＶＤＦ）压电膜产生压力波来测量固体介质中空间电荷分布的一种新方法,介绍了用压电膜产生压力脉冲波的原理与方法以及压力法测量固体介质中空间电荷分布的原理,实验结果表明这种测量方法能很好地用于固体介质中空间电荷分布特性的测量。     

PVDF压电薄膜的应用进展

Ｐ Ｖ Ｄ Ｆ（ Ｐｏｌｙｖｉｎｙｌｉｄｅｎｅ ｆｌｕｏｒｉｄｅ , 聚偏氟乙烯） 压电材料具有独特的热电效应和压电效应,是一种新型的高分子多功能材料 Ｐ Ｖ Ｄ Ｆ 压电薄膜由于制作成本低、容易加工和处理、重量轻、机械性能好等优点,在诸多领域的应用受到人们的广泛关注本文从力和输出的关系、温度与输出电压的关系以及动态响应关系三个方面,综述了 Ｐ Ｖ Ｄ Ｆ 压电薄膜在机械、公路交通、建筑、医学、航空航海等方面的最新进展,并分析了压电薄膜的应用前景和存在缺陷     

压电薄膜压力分布计算机测试系统研究

提出一种新型的压电薄膜（ＰＶＤＦ）压力分布计算机测试系统,它包括多点压电薄膜传感器,多点电荷放大装置,计算机采集处理系统。该系统可以实现全场、实时测量,其动态范围可达０．１Ｈｚ～５００Ｈｚ。采用微机输出具有独特的图象动画显示,使测量结果更为直观。文中叙述了系统的工作原理以及实验测试,测试结果证实了系统的动态压力分布测量能力。本系统的研制为动态接触问题的研究及振动测试开发了新的研究工具。     

基于TGA—FTIR联用技术的PVC热解研究

用ＴＧＡ－ＦＴＩＲ联用的方式进行了ＰＶＣ在空气条件下的热解实验,分别用ＤＤＴＧ曲线与ＦＴＩＲ的红外三维图、Ｇｒａｍ－Ｓｃｈｍｉｄｔ（ＧＧＳ）曲线等描述了ＰＶＣ两个阶段的热解行为,对比了ＤＤＴＧ曲线与ＧＧＳ曲线中峰的位置以及峰的起始时间、终止时间、峰宽等参数,结果表明,ＴＧＡ与ＦＴＩＲ联用时,ＦＴＩＲ的检测无明显的滞后,及返混等情况发生。     

FoxBASE+中调用外部大型程序一法

将用于启动系统的ＣＯＭＭＡＮＤ．ＣＯＭ程序拷贝到ＦｏｘＢＡＳＥ＋（或ＤＯＳ能找到的）目录中，并更名为ＦｏｘＶＩＥＷ．ＣＯＭ．在ＦｏｘＢＡＳＥ＋中用下面的格式调用：ＦｏｘＶＩＥＷ／Ｃ，外部程序．利用这种方法比利用ＦｏｘＳＷＡＰ．ＣＯＭ能多提供１８Ｋ左右的常规内存给外部程序或命令．     

POSFET压电传感器结构参数与特性的研究

本文分析了ＰＯＳＦＥＴ压电传感器的结构参数与特性。理论分析表明ＰＶＤＦ薄膜的声学灵敏度与膜的厚度和膜的弹性刚性系数成正比。实验结果显示，ＰＯＳＦＥＴ传感器的输出峰值随扩展栅面积的增加而增大，随沟道长度的减小而增大。ＰＯＳＦＥＴ传感器的灵敏度比之ＰＶＤＦ直接粘贴硅背衬传感结构提高了２０ｄＢ。     

基于 Client/Server 工艺数据管理

提出了一种基于ＶｉｓｕａｌＦｏｘＰｒｏ３．０客户／服务器的工艺数据管理方法，论述了利用ＶＦＰ３．０最新的数据库技术对工艺数据进行组织、管理，以及利用事务处理机制实现工艺数据安全恢复等方面的关键技术．介绍了工艺数据库管理系统（ＰＤＢＭＳ）的系统结构．     

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。