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Abstract: The theoretical investigation of the coupling efficiency of a laser diode to a single mode fiber via a hemispherical lens on the tip of the tapered fiber in the presence of possible transverse offset and angular mismatch is reported.Without the
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文摘:介绍了一种用于半导体激光器-单模光纤耦合的圆锥端半球透镜的耦合效率的理论计算.失配不存在时,耦合效率随着锥长的增加而减小.失配存在时耦合效率随轴向和角向失配的增大而减小. |
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Abstract: The therortical calculation of the bending stress of the root and experimental stress analysis on the modified profile and the standard involute tooth profile were made with the finite element method and the electric resistance strain film metho
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文摘:分别用有限元和电阻应变片法对修形齿形和渐开线齿形进行齿根弯曲应力计算与实验应力分析.结果证明在弯曲强度方面修形齿形比标准渐开线齿形更优越. |
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Abstract: The thesis deals with the poetry creation of Ling Yi,a poetic monk in the middle of Tang Dynasty,and the relationship between him and his friends,including meditative mates.Thus,the author attempts to discover his unique position of reviving par
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文摘:诗僧灵一是一名天才的诗僧，其方外诗友广泛，他十分重视诗歌创作，在中晚唐诗禅文学史上具有振派澄源的历史地位和孤韵幽逸的诗歌风格。 |
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Abstract: The thesis discusses the causes of measurement errors in auto-capactity measuring instrument circuit and introduces several effective methods to minimize measurement errors.
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文摘:本文就自动电容测量仪电路造成测量误差的原因进行了讨论，同时介绍了减小测量误差的几种有效方法。 |
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Abstract: The three-way emission control technology and the principle of auto exhaust cat alytic converter are introduced.This article indicates some new requires in the auto materials and manufacture techniques after using catalytic converter.
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文摘:介绍了汽车尾气三元催化净化技术及净化器的主要工作原理，着重指出了三元催化净化技术及净化器的出现给汽车材料和制造技术上带来的一些新要求，提出了清洁环保性能是今后汽车发展的重要方向。 |
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Abstract: The threshold algorithm of the target detection is often used to detect target echo signals.Its performance is based on signals-noise ratio.When signals-noise ratio is great than 6.7,the target can be detected.In order to increase the signals-no
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文摘:目标检测的阈值法经常用于检测目标的回波信号.它的性能取决于信噪比,当信噪比大于6.7时,能够检测出目标.为了提高信噪比,经常采用匹配滤波器.如果系统是窄带系统,噪声为色噪声,无法使用匹配滤波器,不能提高信噪比.激光回波信号的几何特征不同于噪声.提出了一种利用这种几何特征检测目标的算法.当信噪比大于2时,该算法能够检测出目标.该算法已经实际应用. |
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Abstract: The traditional catalyst used in acetal(ketal) synthetic reaction is strong inorganic acid.But there is some limits to its use because of its side reaction,strong erosion and liability to pollute the environment.Molybdophosphoric acid is used as
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文摘:缩醛(酮)合成反应的传统催化剂为无机强酸，但由于副反应多、腐蚀性强和易污染环境等缺点，其使用受到限制.用磷钼酸为催化剂，通过醛(酮)与乙二醇直接反应得到了三种缩合产物.对影响反应的诸因素进行研究,结果表明，用磷钼酸作催化剂，用量小，活性高，产品收率较高，且重复使用性能较好. |
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Abstract: The traditional management pattern of the equipment's outlay under the planning economic system couldn't meet the demands of increasing development .
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文摘:在计划经济体制下形成的传统的设备经费管理模式已越来越不能适应形势发展的需要。 |
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Abstract: The traditional teaching of art asks students to copy without paying attention to the colour languages application so that the student cannot control the colour of art in general.
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文摘:传统的美术教学方法只是让学生无休止地临摹，不重视色彩语言的传授，导致学生无法整体地把握色彩，从而削弱了美术教学的效果。 |
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Abstract: The ultrasonic soldering process of aluminium heat exchangers and a few important factors effecting on the soldering are reviewed.
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文摘:论述了铝热交换器的超声波钎焊工艺及其影响钎焊的几个关键因素。 |
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Abstract: The unique rheology of the lecithin-water s ystem has lead to processing difficulties in the drying of lecithin.
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文摘:水化油脚独特的流体特性导致在浓缩脱水时的困难。 |
