Design and Realization of Circular Polarized Crossed Dipole Feeds

The polarization match between the antennae operated in the circular polarization mode can be maintained well without the use of complex tracking systems,many modern satellite and terrestrial point-to-point communications systems use circular polarization(CP) wave propagation in order to maximize the polarization component of the link budget.The effective design method of circular polarized crossed dipole feeds is presented analyzing the self-impedance of linear antennas and the useful design curves also is given here,the crossed dipoles is excited by a single hard coaxial-cable with a slot.The gain and circular polarized axial-ratio of the crossed dipoles is calculated with the electromagnetic simulation software HFSS,the results indicate that the design is reasonable and practical.     

Influence of Edge Polarization Upon the Excitons in Different Thickness and Different Thin Films

The authors discusss exciton energies in a thin film with d thickness and influence of the edge polarization upon the excitons.The polarization is described as interaction between electron(hole) and its image charge.It is found that the interaction decreases the exciton energies to some extent and the influence of the interaction upon the films possessing different dielectric constants and with different thickness are different.     

Studies on the Structure Model of Coal and Its Polarization Characteristics

The macromolecular structures of coal samples collected from Yutianbao, Nantong and Qingnian coal mines in Sichuan were studied and a model of structure for these coals was set up. On the basis of above mentioned work,experimental studies and theoretical analyses were made to investigate the characteristics of coal polarization in applied electric field. The results indicate that the rotation polarzation and the space polarization are the essential reason for the attenuation of electric current through coal samples,and that the space polarization is the main form of coal polarization.     

县域农业循环经济发展模式及对策研究

为了改变当前中国县域农业经济粗放型发展的现状,实现生态和环境协调发展的目标,寻求一种适合县域农业的发展模式,以循环经济理论和生态学为依据,以山东省东阿县为例,探讨了农业循环经济思想在农业上的应用;从该县农业发展面临的资源、生态环境等条件出发,论证了推进农业循环经济发展的必然性,初步构想了东阿县农业循环经济发展的具体模式,并提出了进一步发展农业循环经济相关对策和建议。发展农业循环经济是构建循环型经济社会,实现可持续发展的重要组成部分,也是实现农业转型的必然发展趋势;笔者所做的初步研究期望为县域农业循环经济的发展提供参考依据。     

绿色循环经济模式对蔬菜产销产业链的促进作用

以张家口弘基牧业开发有限责任公司为典型案例,详细介绍了企业种植业与养殖业相结合,通过绿色循环经济促进蔬菜产销体系发展、提高经济效益、环境效益和社会效益的经营模式,说明了种植与养殖结合的产业经营模式对促进绿色有机蔬菜产业发展及保证食用安全的重要性。在此基础上,提出了以农村合作社为主体,实现和推广种植养殖结合发展绿色有机蔬菜产业模式的建议。     

山区低碳循环农业合作经济与生态文明建设模式探讨

为了改变山区农村人多收入低,经济发展落后的局面,淄博市农业部门运用循环农业技术手段、理念和策略,立足山区生态资源优势,积极发展山区低碳循环农业合作经济,取得了以齐文化为核心的山区乡村低碳循环生态休闲观光旅游合作经济,加环延链打造山区高端低碳循环果品农业经济,巧用山区逆境生态资源,拓展外向型花菇合作经济以及集成低碳循环农业技术,升级打造都市有机韭菜合作经济等发展模式,实现了山区农业合作经济与生态文明建设和谐发展的局面,在农业增效、农民增收和山区生态新村建设上做出了显著的贡献,具有很好的借鉴和指导意义。     

Design and implementation of trusted network interaction pattern

In order to establish network interaction pattern based on trust,trust-based basic interaction patterns were proposed and the fuzzy production rules were designed.The basic interaction patterns were used to describe degree of truth of the interaction event trust and that of the integrated interaction pattern.Furthermore,the searching algorithm and refreshing method for the basic interaction pattern based network interaction pattern were proposed.The searching algorithm for integrated interaction pattern is based on the depth-first search algorithm for stack and heap.The active refreshing for integrated interaction pattern is based on user's requirements,while the passive refreshing for integrated interaction pattern is based on trust changes between the interacted entities and the interaction event changes.Theoretical analysis and experiment results show that the method can establish trusted integrated interaction patterns quickly and refresh degree of truth of the integrated interaction patterns.     

Design and Realization of Reusable Electronic Business Based System

This paper brings forward a design and realization of electronic business based system.This system provides a set of application integrated service platform and user portal for the development,running and management of electronic business,based on the standard J2EE.This system also provides a strong,healthy and extendable technical frame for the business application in network environment,which would help the enterprise to realize business process optimization more easily and provides the technical frame for various application integration.     

Probability Analysis of "Strong Beam and Weak Beam" and Axial Compression Ratio in RC Frame

In the view of reliability calibration, this paper analyzes the probabilistic sense of the provisions of "Strong Column and Weak Beam' and axial compression ratio in aseismic criteria (GBJ 11 89), which demonstrates that there is much difference between different aseismic ranks of RC frame. The authors suggest that it is possible to make axial compression ratio larger by adjusting the moment capacity ratio between column and beam. Finally, the direction and method of further studies are proposed.     

新旧动能转换背景下山东省生鲜农产品循环物流模式研究

本文在调研山东省现有的农产品物流模式基础上提出农产品循环物流模式,运用SWOT法进行分析提出新旧动能转换背景下生鲜农产品循环物流的优势、劣势、机会与威胁,并在此基础上从政府、企业、消费者三个层面提出运作策略与展望,以期为山东省新旧动能转换以及生鲜农产品物流模式发展献计献策。     

Design and Realization of Office Automatic Platform Based on Struts

Apache Struts is one of the most popular open source framework for Web applications and developments using MVC Model2 architectural pattern. Using the Information Technology to improve the efficiency of education service is emergent. The aim of this paper is to demonstrate the design and realization of a platform system software based on Apache Struts framework. By briefly analyzing the extra requirement in higher education service, an architecture based on MVC design pattern is presented. Some core technologies used in the platform system software, such as Struts Tiles and Struts Menu etc, are proposed in details by the end. Because of its struts-based fundamental architecture and running mechanism, the platform system software made a certain performance advantage and largely reduced the developing period.     

天津市水产养殖适宜性评价系统的设计与实现

为实现区域资源利用最大化,实现经济与产业的协调可持续发展,研究采用德尔菲法(Delphi)和层次分析法(Analytical Hierarchy Process, AHP)构建天津市水产养殖适宜性评价模型,在此基础上基于IDRISI软件开发了天津市水产养殖适宜性评价系统。系统首次整合了天津市整体海、淡水及武清区、汉沽区两个典型养殖区域的基础数据专题地图和评价模型参数文件,实现了线性加权地图处理、地图再分类、地图追溯和地图显示等核心功能模块。用户也可在调用现有的评价模型之外自定义完成基于栅格地图的多准则评价模型的构建。利用系统运算可得出天津市适宜水产养殖的四类地区分布,即不适宜、一般、适宜和非常适宜地区,从而为天津市水产养殖规划及管理提供相关参考依据。     

基于GIS的农业经济信息服务系统的设计与实现

针对现有农业经济信息服务系统的缺陷,提出了结合地理信息系统技术的改造方案。以组件式GIS软件Supermap Objects为开发平台,C#.Net为语言环境,采用面向对象和组件式开发技术,设计和开发了农业经济信息服务GIS系统,并建立了农业经济基础信息空间与属性数据库。新的系统实现了农业经济信息数据的空间查询和空间分析,为各级农业部门提供辅助决策手段和辅助分析依据,提高了农业经济信息服务的水平。文章详细阐述了系统的体系结构、功能模块和在C#.Net中使用Supermap Objects组件对象进行地理信息系统开发的基本过程。     

小型水稻收割机纵轴流脱粒分离装置结构设计与试验

为解决中国南方丘陵山区大型收割机具通过性差,横轴流式收割机脱粒损失率大的难题,设计一种小型轴流式水稻联合收割机脱粒装置,将其装配在收割机整机上进行了田间脱粒损失率试验。结果表明：弹性脱粒杆齿齿距、导条螺旋升角、凹板筛直条倾角3 个影响因素对水稻脱粒损失率影响显著;对各因素最优组合的取值为弹性脱粒杆齿齿距a=90 mm,导条螺旋升角α =23°,凹板筛直条倾角θ =14°,此时的水稻脱粒损失率为1.51%,达到国家标准小于3%的要求,试验数据为小型轴流式水稻联合收割机的产业化提供了技术保障。     

Design and Realization of Video Consultation Classroom Based on IP Network

How to make use of computer network in teaching becomes the focus of concern for the computer engineers and teachers.The remote video consultation classroom can be used in teaching by using internet and NGN server to improve the instruction and stimulate the students' interest in study.As the IP network is widely used in campus,connection could be set up for student dormitory,office or even the teacher's home.On the computer network teacher and student can discuss face to face online and make best use of their time.This paper discusses the problem about how to construct a network-video class room based on computer network including VOIP and NGN(new generation network) switch server.     

Design and Realization of One Vehicle Management System Based on Web-GIS

This paper presents one of Vehicle Management System base on Web-GIS technology, which has the capability of using all kinds of GPS equipment being made by different company, and aslo can support the customized Vehicle Management System that is constructed for the demand of all kinds of consumer(individual and group).To generate the Web-GIS map, it uses the map generating engine of MapXtreme. To be compatible with different equipments, it uses uniform normalized protocol of communications and the network of GSM. It uses the technology of EJB and B/S for the expansibility. All of these technology build up the expansibility of system and the operating system with Web and reduce the cost of maintenance. The utility of system is aslo enhanced.     

矿粉粒度及反应温度对高磷鲕状赤铁矿制备碳化铁的影响

基于对50根弯曲破坏钢筋混凝土圆柱低周反复试验结果的分析,建立了完整滞回环的数学表达式并推导得出等效阻尼比计算模型;以双柱墩桥梁为例,说明了建立桥梁整体结构等效阻尼比与墩柱端部塑性铰等效阻尼比关系的方法。研究表明,完整滞回环数学表达式较好地反映了弯曲破坏钢筋混凝土圆柱的滞回特性,得到的等效阻尼比模型计算结果与试验结果符合较好;采用建立的桥梁整体结构等效阻尼比与墩柱端部塑性铰等效阻尼比的关系进行pushover分析更能反映实际情况。采用等效阻尼比模型算得的目标位移与基于Rosenblueth模型和Kowalsky模型算得的位移之间存在较大差距。