Results 41 to 50 of about 156 (92)
Dianci bileiqi, 2016 为了提高输电线路防雷高效性,以普通并联间隙为基础提出一种基于冲击气流作用的灭弧防雷间隙。通过分析灭弧防雷间隙和绝缘子配合时的伏秒特性,研究了其截断电弧机制。建立链式电弧模型,并对电弧元进行受力分析,推导出电弧元各速度分量控制方程,得出其数值与电弧元长度无关,与冲击气流速度有关,且气流速度越大电弧运动越快越利于熄灭电弧。运用Ansys10.0软件对流体进行气流场仿真,利用高速摄像机拍摄电弧的变化过程,通过数字示波器记录电弧电压波形,仿真结果与试验结果表明:2.6 ms时冲击气流速度最大且稳定的作用于电弧 ...
李国栋, 王巨丰, 吴东
doaj
[Effectiveness analysis of resection and reconstruction of primary bone tumor in pelvic zone Ⅱ]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2023 Huang J +8 more
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Gaoya dianqi, 1998 一、前言 现场运行实践表明,DS7型直流快速断路器在开断短路电流时被电弧烧伤的现象时有发生。特别是当短路点距变电所较近时,由于电弧飞溅,除烧损断路器本身以外,还会烧损直流母线和间隔的铁构架,造成电弧接地和直流接地继电器动作,迫使变电所直流系统全部停电。为此,我们曾做过一些加强抗弧和灭弧方面的工作,例如采用耐弧材料以抗弧,采用迷宫式灭弧室增强灭弧能力等,但效果都不明显 ...
金福林, 王盛起
doaj
Expert consensus on the prevention and first-aid management of burns in children. [PDF]
Zhongguo Dang Dai Er Ke Za Zhi, 2021 Pediatric Disaster Branch of Chinese Pediatric Society of Chinese Medical Association +2 more
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Gaoya dianqi, 1999 介绍了用合成回路测量真空灭弧室触头电感的方法,并进行了理论计算.计算结果与测量结果接近,说明测量方法可行、结果可靠.测试表明,本文中铁芯式两极纵磁触头对的等效电感为1.02μH,杯状纵磁触头对的等效电感为0.99μH.
刘志远, 王季梅, 贾申利, 苑舜
doaj
Effect of micro/nanoscaled Ti phosphate/Ti oxide hybrid coating on the osseointegration of Ti implants. [PDF]
Hua Xi Kou Qiang Yi Xue Za Zhi, 2021 Zhang J, Zhu SS, Jiang N.
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[Clinical application of modified fistulectomy in the treatment of congenital pyriform sinus fistula based on segmental anatomy of fistula]. [PDF]
Lin Chuang Er Bi Yan Hou Tou Jing Wai Ke Za Zhi, 2023 Gong X +8 more
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[Therapeutic effects of sacral neuromodulation on detrusor underactivity]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2021 Wang Q +7 more
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[Application of three-dimensional printed porous titanium alloy cage and poly-ether-ether-ketone cage in posterior lumbar interbody fusion]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi, 2022 Wang Y, Zhou Y, Chai X, Zhuo H.
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