GSM—R在高速铁路列控系统的应用技术方案探讨

从GSM—R与CTCS3级列控系统的接口入手,讨论GSM—R在CTCS3系统应用中的接口关系、通信建立与可靠切换。无线网络覆盖、通信安全等一系列问题的具体技术方案。GSM—R系统在高速铁路列车运行控埘CTCS3应用中。已进入实质应用阶段。     

基于电力线的改进扩频通信系统的研究与设计

根据理论研究确定了一套基于电力线的改进扩频通信方案,该方案在PN码同步捕获方面和位同步方面作了改进,并在MATLAB R2006b/SIMULINK环境下,对扩频通信系统进行总体仿真,验证了此改进的扩频通信系统的可行性.     

车用有机朗肯循环余热回收系统方案及工质选择

针对某车用柴油机的余热特性,分别采用简单有机朗肯循环、带回热器有机朗肯循环和抽气回热式有机朗肯循环对其排气余热能进行回收利用。根据3种有机朗肯循环系统的工作原理,分别建立了其热力学模型,选取R123、R141b、R245ca、R365mfc、R601、R601a作为系统工作介质,对比分析了3种有机朗肯循环系统的热力学性能。结果表明,工质R141b可作为简单有机朗肯循环和抽气回热式有机朗肯循环系统最优工质;工质R601a可作为带回热器有机朗肯循环系统最优工质。当采用R141b作为系统工质时,抽气回热式有机朗肯循环系统的最大热效率和净输出功率分别可以达到17.08%和14.41 k W,具有最优的热力学性能。因此,抽气回热式有机朗肯循环系统方案可作为最佳选择方案。     

多媒体远程教学系统的设计与实现

本文重点阐述了“多媒体远程教学系统”实现的方案及系统的结构,并介绍了用Lotus Domin R5和LearmingSpace构建企业级分布式网络培训体系的理论基础及整体解决方案的优势。     

基于R8610的嵌入式网络音频播放系统设计与实现

针对网络音频播放系统的发展现状,研究并实现一种低成本、多功能的嵌入式网络音频播放系统的设计方案．该方案以RDC公司生产的X86架构的R8610为核心,以Linux作为系统平台,利用套接字实现进程间的通信,完成用户对网络音频播放的控制．实验证明,该方案在降低成本的同时能够满足用户的需求．     

多媒体远程教学系统的设计与实现

本文重点阐述了“多媒体远程教学系统”实现的方案及系统的结构，并介绍了用Lotus Domino R5和LearningSpace构建企业分布式网络培训体系的理论基础及整体解决方案的优势。     

中小企业ERP和CRM系统整合的SaaS解决方案研究

在讨论新的SaaS概念和中小企业ERP,CRM系统特点的基础上,提出了基于SaaS模式的中小企业ERP,CRM系统整合的新方案,并以销售管理子系统为例,构建了SaaS模式解决方案的逻辑体系,指出了中小企业实施SaaS模式的安全风险及应对措施.     

新型西门子地铁列车空气压缩机的控制分析

空气压缩机在地铁列车上作为唯一的气源为地铁列车的空气制动系统和车辆空气悬挂系统提供必要的压缩空气.上海地铁应用的西门子列车使用SIBAS系统控制空压机的方法,对这种控制方法目前存在的问题进行分析并提出应对方案.     

制造-分销网络系统的部署方法

结合汽车产品的生产系统规划问题 ,提出一种生产 -分销网络系统的部署规划方法 .针对传统的网络规划算法模型只局限于对给定方案进行评价分析的问题 ,通过对典型汽车 (产品 )生产系统本地化过程的分析 ,重点研究了基于案例分析与推理的生产 -分销网络初始部署的方案规划方法 ,即案例系统的知识分析抽取方法 ;以相关产品构成为出发点 ,建立相关本地制造 (零部件 )资源制造有效性的分析方法 .在此基础上 ,采用 ithink R○ 分析工具 ,基于案例分析与有效性分析结果 ,建立了制造 -分销网络初始部署的方案规划的仿真模型 ,并用于解决工程问题     

高校舆论环境的变化及其应对

2000年以来高校舆论环境发生了显著变化,高校越来越成为社会舆论的焦点,呈现出多元化和集中化并列的趋势和特点,同时引发了各级教育机构对舆论环境的关注与重视。高校应客观理智地看待舆论的多样化,并积极应对所处的舆论环境,建立一套系统的应对方案,促进高校与舆论环境良性互动发展。     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

只要努力,不要后悔

There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…     

库克斯顿城堡

城堡, 是欧洲典型的建筑之一, 每个城堡都有一个美丽的传说或是一段历史。从本期开始, 我们将推出“城堡之旅”, 带各位读者去浏览、观赏欧洲各地的城堡, 开始一段文化与历史的旅途!     

The Reader Response Approach to Teaching of English Literature

During interview with English majors, it was found that a majority of students expressed disappointment with their experience of English literature classes. Students' dislike of learning English literature appears to be the major problem of teaching English literature in China. Reader response approach is a good way to solve this problem. In this paper, I explain the rationale behind the reader response approach, such as its origin, definition, features, assumptions, and strategies. Then I illustrate how reader response approach works as a teaching strategy by presenting several teaching models. At last I evaluate its usefuiness for teachers and present the advantages of reader response approach in Chinese context.