共查询到20条相似文献，搜索用时 359 毫秒
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张玮 《西安铁路职业技术学院学报》2009,(3):14-17,13
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。 相似文献
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《洛阳师范学院学报》2016,(8):31-34
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. 相似文献
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《实验室研究与探索》2015,(10)
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。 相似文献
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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． 相似文献
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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。 相似文献
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姜敏 《淮北职业技术学院学报》2013,(6):141-142,144
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. 相似文献
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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 相似文献
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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。 相似文献
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罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
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Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
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Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
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《海外英语》2007,(5):10-11
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? 相似文献
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陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(4):36
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. 相似文献