Results 91 to 100 of about 168,007 (149)
, 1996 研制了一种全内反射型InGaAsP/InP光波导开关。采用氧离子注入形成的高阻特性来作为载流子注入区的隔离。由此获得陡峭的反射面,改善了光开关的性能。在入射光波长为1.3 μm,注入电流为32 mA下得到光开关反射端消光比为18 dB,无注入时的关态串话为-19 ...
杨培生 +6 more
core
Gaoya dianqi, 2019 小型化后的40.5 kV开关柜受尺寸限制,普遍采用加装SMC绝缘隔板的复合绝缘方式,但开关柜母排对绝缘隔板放电的故障仍然较为普遍,因此对放电原因的研究很有必要。文中首先对一台KYN61-40.5型开关柜进行工频耐压试验,验证运行中开关柜内母排对绝缘隔板放电的可能性。其次通过绝缘隔板的加速热老化、湿热老化试验,采用SEM测试、交流击穿场强、耐漏电起痕指数和憎水性检测等绝缘材料测试评估方法,研究绝缘隔板理化特性变化规律,进而得出放电的原因。研究结果表明:开关柜绝缘隔板故障并非绝缘隔板击穿强度降低引起 ...
刘衍 +4 more
doaj
[Comparison of Epsilometer test and agar dilution method in detecting the sensitivity of Helicobacter pylori to metronidazole]. [PDF]
Beijing Da Xue Xue Bao Yi Xue Ban, 2023 Tian XL +5 more
europepmc +1 more source
[Exogenous nitric oxide suppresses K <sub>ATP</sub> channel activity through S-nitrosylation]. [PDF]
Sheng Wu Yi Xue Gong Cheng Xue Za ZhiWang X, Zhang Y, Hu W, Hao X.
europepmc +1 more source
[Prediction and <i>in vitro</i> validation of potential indications for ginkgolide B based on network pharmacology strategies]. [PDF]
Zhejiang Da Xue Xue Bao Yi Xue BanZhang H, Fan Q, Zhang Y, Liu M, Cui G.
europepmc +1 more source
Gaoya dianqi, 1979 高压开关柜内部发生电弧短路时,电弧持续燃烧放出的能量可能造成严重破坏,本文综述了开关柜(特别是封闭式开关柜)内发生电弧短路时承受的电动力及其运动规律,柜内气压及温度变化等一系列物理过程,并指出能限制其破坏范围的措施。
doaj
[Analysis of potential association of alcohol exposure with femoral head osteonecrosis and construction of a diagnostic model using machine learning]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoTao H, Liang F, Huang W, Fan S, Zeng P.
europepmc +1 more source
[Rehabilitation guidelines and specifications for traumatic spinal cord injury (2025 edition)]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiProfessional Committee Of Spine And Spinal Cord Injury Rehabilitation China Association Of Rehabilitation Of Disabled Persons +3 more
europepmc +1 more source