Results 31 to 40 of about 912 (83)
Gaoya dianqi直流断路器（DCCB）是解决直流系统短路故障的重要手段，针对现有DCCB存在的限流效果差、避雷器使用寿命短和故障隔离速度慢等一系列缺陷，文中提出一种具备限流能力的混合式高压直流断路器拓扑（CLC-HDCCB）方案。CLC-HDCCB载流支路和转移支路采用双桥式结构，具备双向通断能力；限流部分采用限流电阻和限流电感并联限流方式，显著降低了故障电流峰值及上升率；设计泄能电阻在断路过程中将限流电感旁路，减少了避雷器单次开断吸收的能量；对所提CLC-HDCCB方案分断故障电流 ...
周蒙恩 +5 more
doaj
Gaoya dianqi为解决传统电阻型超导限流器因超导组件参与常态通流而产生的超导带材用量过多及电流引线漏热功率过大等问题，提出了一种适用于中压船舶直流电力系统短路故障保护的新型混合型超导限流器拓扑结构。对其基于IGBT、高速真空开关的联合换流过程进行了试验研究与理论计算，得出了电容、电感、电阻等参数对换流过程的影响规律；采用盘式无感绕制的方式制作了超导带材盘，组成的高温超导组件电感值仅2.9 μH；介绍了限流器用高速真空开关的触头运动特性；最后对限流器样机进行了试验，样机成功将预期峰值为57.6 kA的短路电流限流至24 ...
陆利强 +4 more
doaj
Gaoya dianqi近几年，C4F7N/CO2混合气体因为较低的温室效应和优异的绝缘性能受到广泛关注，但是C4F7N的电弧分断性能实验昂贵、费时，所以文中以SF6和C4F7N/CO2混合气体为研究对象，建立了在固定开距直流电源条件下的电弧模型。通过电弧累计能量和电导的计算结果分析SF6和C4F7N/CO2混合气体的灭弧性能，通过对径向温度、物性参数的分析和能量运输的计算分析SF6和C4F7N/CO2混合气体的换热机理。研究结果表明，C4F7N/CO2混合气体的电弧特性比较接近SF6气体 ...
李静, 荐雯, 曹云东, 王成丽
doaj
[How I treat vasovagal syncope in children]. [PDF]
Zhongguo Dang Dai Er Ke Za ZhiZou RM, Wang C.
europepmc +1 more source
[Extracellular matrix materials and tissue regeneration and repair]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiZhao L, Xie H.
europepmc +1 more source
[Exposures to volatile organic compounds are positively correlated with risks of metabolic dysfunction-associated steatotic liver disease]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoLi K, Zeng W, Zhang Y, Zhu X, Guo B.
europepmc +1 more source
[Effectiveness of posterior single-level osteotomy with 360° release and correction in treatment of osteoporotic vertebral compression fractures with moderate to severe kyphosis]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiQing P +5 more
europepmc +1 more source
[Evaluation of an interpretable 12-lead ECG automatic diagnosis model based on deep feature fusion]. [PDF]
Nan Fang Yi Ke Da Xue Xue BaoLu X +5 more
europepmc +1 more source
["Chongqing experiences" in treatment of bone infections]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiXie Z.
europepmc +1 more source
[State-of-the-art in peripheral nerve injury diagnosis and therapy]. [PDF]
Zhongguo Xiu Fu Chong Jian Wai Ke Za ZhiSun J, Chen L.
europepmc +1 more source