面向绿色制造的工艺种类选择模型及应用

绿色制造工艺规划是实施绿色制造的关键环节,而绿色工艺种类的选择是绿色制造工艺规划的首要内容.在分析了面向绿色制造工艺种类选择的时间、质量、成本、资源消耗和环境影响等5个决策目标的基础上,提出了面向绿色制造的工艺种类选择应遵循的一般性原则,建立了面向绿色制造工艺种类选择的多目标决策数学模型,并应用模糊加权系统方法对模型进行求解.最后,通过某零件毛坯砂型铸造成型工艺种类的选择实例,说明了绿色工艺种类的选择过程.实例分析与求解结果验证了该模型及其求解算法的可行性和实用性.图1,表2,参9.     

面向绿色制造的金属表面热处理工艺规划决策问题研究

在对金属表面热处理工艺的资源环境特性和加工时间、加工质量、加工成本、资源消耗、环境影响5个绿色制造目标特性分析的基础上，对面向绿色制造的表面热处理工艺中的决策问题进行了研究，并结合某工件表面热处理加工中的热处理设备选择问题进行了案例分析。     

绿色制造工艺规划的一种模型辅助决策技术

从数学角度出发，建立了有关绿色制造工艺规划具体问题的决策总模型及其分解子模型，提炼出了关于绿色制造工艺规划问题的一种新技术，分析了该技术的实质、模型选择原则和模型解法，并结合实例开发了辅助决策模型库应用系统。     

面向机械加工工艺规划的绿色制造技术探析

绿色制造技术是符合现代环保意识与资源效益的新型制造模式。在保证产品的功能、质量、成本的前提下,绿色制造工艺对机械加工工艺的优化将体现在环境保护、资源利用率等方面。本文对绿色制造技术进行细化分析,将传统机械加工工艺规划与绿色制造技术进行对比,简述绿色加工工艺技术,对绿色制造技术进行探析。     

化学合成的选择与绿色评价

提出了化学合成工艺的选择和绿色评价问题。概述了原子利用率、合成效率和目标产品效率作为化学合成工艺的绿色评价指标。化学合成实例分析的结果表明,在原子利用率、合成效率和目标产品效率3个评价指标中,采用目标产品效率最科学。     

面向绿色制造的刀具选择决策模型及其应用

刀具的合理选择是提高切削加工绿色性能的重要途径之一。绿色制造是解决当前制造业日益严峻的环境问题的新模式。基于绿色制造的思想，建立了一种集时间（T）、质量（Q）、成本（C）、能源消耗（R）、环境影响（E）等五大决策目标的面向制造的刀具的优化决策模型及其多目标评价指标体系和以及模型约束条件。采用模糊聚类综合评价方法，对上述模型进行求解。结合一个齿轮加工过程中面向绿色制造的滚分选用针对不同材料的刀具进行决策的切削性能研究的实例，对该决策模型的应用和求解过程进行了说明。     

绿色产品制造工艺评价体系与方法研究

通过对影响产品制造工艺因素的分析，从资源利用属性，能源利用属性，环境负担和经济性等几个方面建立了绿色产品制造工艺评价体系的层次结构图，并应用加性加权法首先排除绿色产品制造工艺方案集中的劣解，对绿色产品制造工艺方案进行规范化处理和采用和法求得权向量，最后确定绿色产品制造工艺的最优解，在此基础上应用实例求绿色产品多个制造工艺方案的最优解，并通过验证是可行的。     

基于绿色制造的冲压加工工艺决策技术的研究

对冲压加工中的资源耗损和环境影响这两个绿色特性进行分析并提出了改进措施，根据对这两个绿色特性的分析建立了面向绿色制造的冲压加工工艺决策模型，并结合某企业压力机设备选择问题对该决策模型进行了验证。     

基于多维关联函数的调整工艺选择

 为解决快速扩散制造中工艺调整方案的选择问题, 分析工艺调整对扩散制造产生的多种影响, 通过关系矩阵和基于实例搜索的方法定量计算影响值;在主制企业对影响值提出的约束基础上, 采用多维关联函数的方法, 通过点位置判断和降维计算等过程计算得到符合影响约束范围内调整工艺;以某型叶片的调整工艺方案选择分析为例, 计算得到主制企业期望的工艺方案, 验证了本方法的适用性和可行性。     

绿色制造模式下供应商的评价与选择方法及软件实现

为了对绿色制造模式下的供应商进行系统科学地评价和选择,从质量、成本、交货能力、技术能力、服务和环境6个方面构建了供应商的评价指标体系,运用属性层次模型确立了各指标的权重。根据属性层次模型原理利用Delphi软件开发了一套SES(Supplier Evaluation&Selection)系统,对供应商的选择进行了实证分析评价。分析结果表明:属性层次模型方法对于绿色制造模式下供应商的选择有较好的适用性。     

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.     

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。