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Abstract: The conformal flat space-time solutions in electromagnetic and scalar theory are shown,and the indefiniteness of the plane-symmetric solutions and the method for defining a noncontinuous field by the intersection of multi-solutions are demonstra
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文摘:给出电磁场和标量场在共形平直时空中的解,发现了平面对称解的不确定性及由多重解的交集来定义一个非连续场的方法. |
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Abstract: The constitution,process principle and parameters of a continuous desulphurization system used to desulphurize the base iron for nodular iron was introduced.The characteristics of the system and its operation instruction was explained.
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文摘:介绍了一种炉外球铁原铁液连续脱硫系统的组成、工艺原理及有关参数，说明了该系统的使用方法及特点。 |
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Abstract: The construction of the liquid angular sensor in the laser beacon is designed , the work principle and magnify circuit are analysed .
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文摘:对激光基准信标仪中所采用的液体摆角传感器的结构进行设计，分析其工作原理、放大电路。 |
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Abstract: The consumption of luxury brand by Chinese consumers is increasing rapidly not only domestically, but also abroad.
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摘要：中国奢侈品的消费正在快速增长，不仅在国内，而且在海外大量购买。 |
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Abstract: The content of Fe,Zn,Cu,Mn,Ca,Mg,Na,K and Pb in the hair of 120 normal children in a kindergarten in Changchun was determined by AAS.
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文摘:用原子吸收光谱法测定了长春市某幼儿园120名正常儿童头发中铁、锌、铜、锰、钙、镁、钠、钾、铅九种元素含量。 |
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Abstract: The continually increase in digitized information resour ces such as disc publications and on-line databases,which put forward new task s for the collection construction of library,requires that the libraries of coll eges and universities shoud
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文摘:光盘出版物、联机数据库等数字化信息资源的不断增长，给图书馆的馆藏建设提出了新的任务.这就要求高校图书馆必须重新制定馆藏采购标准，适当加大数字化信息资源的投入比例，并在新的采购标准指导下，不断优化本地馆藏，充分利用计算机网络上的虚拟馆藏，同时做好网络时代图书馆的重要馆藏资源——网址及数字化出版物的收集与管理工作. |
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Abstract: The contrast experimental trials of three refining processes are car ried out for ladle bottom bubbling with nitrogen,nitrogen-argon or argon .The results show that the nitrogen content in steel has an important influence on the stretchability o
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文摘:进行了钢包底吹氮、底吹氮-氩和底吹氩三种精炼工艺对比试验，结果显示，钢中对钢丝拉拔性能影响显著。 |
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Abstract: The control reconfigurable aircraft with multi-surfaces needs robust basic flight control system to support enough time for failure detection and isolation.When partial surface loses,it can keep the damaged aircraft stable.In this paper,multivar
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文摘:控制可重构飞机要求其基本飞行控制系统对舵面部分缺损故障具有强的鲁棒特性，在故障发生后保证飞机的稳定性，提供足够的时间进行故障的检测和隔离，为控制系统重构提供条件.本文采用高速采样PI控制器设计输出反馈跟随系统，给出了控制器的设计方法，并分析了它对于控制舵面部分缺损故障的鲁棒特性.仿真结果表明，这种控制器具有好的鲁棒特性. |
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Abstract: The controling technological development of the general flowsheet of the on-the-spot domestic and foreign kiln's group in the past decades,and on the basis of prartise of fildbus control system in ceramic kilns,some questions in application are
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文摘:描述了国内外数十年来陶瓷窑炉群的现场总线控制技术的发展，并根据现场总线技术在陶瓷窑炉群控制方面的实践，探讨了有关的应用问题。 |
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Abstract: The conventional variable structure control technique for uncertain system requires that the uncertainty bound is known as a premise to assure robustness.The requirement creates an over-conservative controller and enlarges chattering.The propose
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文摘:常规变结构控制用于不确定系统，须利用不确定性界确保系统的鲁棒性，控制器过于保守且抖振变大.本文把未知干扰和参数不确定性的影响等效为名义系统的外界干扰，利用时延技术对干扰进行在线估计，并将估计值引入到变结构控制中，从而抵消掉系统中的慢变不确定性，利用离散趋近律法，推出了准滑动模态的存在条件及其带宽.该方法克服了以往控制方法中须已知不确定性界的限制，且不必满足匹配条件，用较低的控制增益保证了系统的鲁棒性，降低了准滑动模态带即削弱了抖振. |
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Abstract: The conversion from volume flow to mass flow is implemented by using intelligent flow computer with necessary accuracy. The converting method， field wiring and calibration results are introduced concretely.
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文摘:介绍利用智能流量计算机，在保证精度的情况下，实现了体积流量转换成质量流量。具体介绍了转换方法、现场接线与校验结果。 |
