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从WiMAX到MWBA 总被引：1，自引：0，他引：1
韩德勋 《重庆职业技术学院学报》2005,14(2):116-118
通信技术层出不穷，WiMAX即是有力证明。今年六月，IEEE批准通过了称为802．16—2004的固定WiMAX无线标准．新标准将修正和替代原有的802．16、802．16a和802．16REVd，这必将推动固定宽带无线解决方案的开发和创新，与此同时．移动版WiMAX的标准——802．16e(它也被称作一种MWBA标准)也在开发之中，该标准预计将在2006年正式完成，它将实现真正的无线宽带连接。 相似文献
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冷冻离心机在高校分子实验中应用广泛,几乎渗透到分子生物学的各个领域,在教学和科研中发挥着重要作用。对实验室中的高效冷冻离心机加强日常维护、使用和保养,对出现的事故及时进行分析,采取有效措施及时排除故障,这对提高该设备的使用效率和延长寿命发挥着重要作用。本文以Avanti J-E高效冷冻离心机为例,对冷冻离心机在使用过程中的注意事项和保养方面提出一些可行性建议。 相似文献
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超速离心机是系统生物学研究的重要工具。但是它价格昂贵,维修保养要求严,使用费用高,很多学校科研单位不具备购买的条件。本文介绍了在药学院公共实验平台中超速离心机所发挥的教学科研作用。 相似文献
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针对学习“数控原理与系统”、“数控系统综合实践”、“数控机床故障诊断与维护”等专业课缺少实验装置等问题，介绍了一种基于西门子802S数控系统电气实验装置的研制，重点介绍实验装置的设计思想、性能特点、组成结构、软件功能开发以及开设的主要实验内容。实践证明，实验装置能满足数控技术应用偏电专业课程教学要求．该实验装置已在多所院校应用。 相似文献
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张进春 《四川职业技术学院学报》2005,15(2):105-106
Mastcrcan是数控加工中用得非常多的的一种CAD／CAM软件，但该软件未提供针对SINUMERIK 802S系统的后置处理程序，本文在作者多年使用SINUMERIK 802S系统经验的基础上，提供一种将Master cam提供的FANUC0-MC系统的后置处理程序修改为SINUMERIK 802S系统专用后置处理程序的方法，对使用其它系统的数控铣床也有一定的借鉴作用． 相似文献
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综述802．11n的发展史、核心技术、草案标准竞争与合作和草案级产品几个方面，着重介绍了802．11n使用的五种核心技术，结合实际谈了自己的看法． 相似文献
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在分析了传统的PPPOE和Web／Portal认证方式在局域网上的存在问题后，介绍了新的认证协议802．1x，并给出了利用802．1x对校园网络进行优化的应用实例。 相似文献
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针对IEEE802.11标准在数据加密和身份认证两方面存在的设计缺陷，IEEE802．11i标准进行了相应改进，较好地解决了存在的问题，但IEEE802．11i在运行中也可能存在一些问题。 相似文献
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通过SHS离心法试验原理，对卡盘夹持式SHS离心机的结构设计思路、主要特点进行了介绍，实践证明，设计的卡盘夹持式SHS离心机成功制备的外径76mm、长度100mm的陶瓷内衬复合钢管，产品性能稳定。 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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《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
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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