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Abstract: The sources and categories of noise about return-path of HFC(hybrid fiber/coax) are analyzed, and a few effective methods of reducing noise are presented for different noise,which simultaneously the choice of modulation and multiple access techn
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文摘:分析了HFC网络上行信道噪声的来源和分类，针对不同的噪声提出几种有效的抑制方法，同时结合上行信道多址接入方式和调制解调方式的选择来抑制噪声。 |
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Abstract: The special feature of SDH and its dominant position in long distance communication of factories and mines were described,and an engineering design was llustrated.
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文摘:论述了SDH同步数字传输系统的特点及在厂矿企业远距离通信中的优势，并结合实例介绍了其工程设计方式。 |
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Abstract: The speech made a brief introduction of the basic nature condition of Chinese seas and summarized the national laws, regulations, policies, plans and recent achievements of marine environmental protection in China.
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摘要：本演讲介绍了中国海域自然状况，海洋环境保护方面的国家法规、政策和规划以及近年来的工作发展。 |
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Abstract: The spin-vibrating pulverizer is a kind of multi-freedom degree non-linear system. The methods of determining best parameters are given by the research of the working principles of the machine.
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文摘:低噪旋振制样粉碎机是个多自由度非线性系统，文中通过对其工作机理的研究提出了合理选择参数的方法。 |
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Abstract: The stability of the wall-climbing robot which climbs on are surface was analyzed in this paper by using theories about integral equation.A new kind of sealing structure was designed and its ability of solving the problem of gas leakage when rob
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文摘:本文利用积分方程的有关理论对爬壁机器人在弧面上爬行时的稳定性进行了分析求解.提出了一种新型的钍对弧面上爬行的爬壁机器人的密封结构.经过实验验证了此结构能够解决爬壁机器人在弧面上爬行时气体汇漏量大的问题. |
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Abstract: The state of art in WfMS research is summarised.Some WfMS-relative concepts are described,followed by the Workflow Reference Model proposed by Workflow Management Coalition and the typologies of workflow systems.The important research aspects of
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文摘:总结了工作流管理系统的研究现状，详细介绍了工作流管理系统的一些相关概念，分析了工作流管理联盟提出的工作流参考模型，给出了工作流系统的分类，并指出了今后的研究方向. |
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Abstract: The stator's inner suface of vane pump is very complicated.When machining the su rface,special profile grinding machine.
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文摘:叶片泵定子曲面的形状比较复杂，修磨时往往需要专用仿形磨床。 |
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Abstract: The stimulation treatment of "loosening rock by the dilatancy of explosive waves" is tested in the casing well 4242 for studying its result and its influence on casing.The result of the field test shows that this test is successful in
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文摘:为了研究“压胀松动”增产技术的增产效果和对套管的影响,在延长石油管理局子长油矿对4242井进行了现场实验.该技术采用强动载波在地层深处叠加的方法,造成压胀条件,松动岩石,增大近井带渗透率,提高油井产量.施工后,该井产量增加为原来的4倍多.本次实验工艺上是成功的,首先是按设计要求引爆了炸药,其二是由于采取了保护措施,使套管变形局限在施工段处,不影响下泵,不影响油井生产;套管强度校核分析也证明了套管不会破坏.施工后地质效果明显. |
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Abstract: The structural characteristics, properties, main preparation methods of bulk nanocrystalline materials, and their application and development prospect in material engineering are introduced.
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文摘:介绍了大块纳米晶材料的结构特性、性能、主要的制备方法以及纳米晶材料在工程中的应用前景。 |
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Abstract: The structure and operating principle of triangulation probe are firstly briefly introduced in the paper.The analysis and derivation for the reflection property of metal surface are carried out.Several existed problems and solving schemes for me
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文摘:首先简单介绍了三角法测头的结构和工作原理，对金属表面的反射特性进行了分析和推导，提出了三角法测量金属表面时存在的几个问题以及解决方案。 |
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Abstract: The structure and the properties of the grinding ball made of the composite cast iron have been researched in this paper.The result indicates that added trace boron and a proper quantity copper to this kind of composite cast iron can increase it
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文摘:研究了一种复合铸铁磨球的组织和性能，结果表明，化学成分和淬火工艺对这种复合铸铁磨球的组织和性能有很大影响，微量的硼和适量的铜可以明显地提高磨球的淬透性，经过余热淬火得到贝氏体或马氏体基体组织，从而提高磨球的硬度和冲击韧性。 |
