Results 91 to 100 of about 517 (145)

高速气流中沙尘对复合绝缘子闪络特性的影响研究

Gaoya dianqi, 2018
运行于高速沙尘环境中的车顶复合绝缘子频繁发生异常及不明闪络现象,严重威胁列车的安全、稳定运行。风沙环境使得复合绝缘子附近的空间电场发生了一定的畸变,会影响复合绝缘子的闪络特性。文中基于风洞试验系统探究高速气流环境中沙尘对复合绝缘子闪络特性的影响,测定了高速气流沙尘状况下复合绝缘子的闪络电压,对比了在有沙尘与无沙尘时复合绝缘子的闪络电压,揭示了沙尘环境下复合绝缘子闪络电压的变化趋势;实验结果表明:高速气流环境下,复合绝缘子的闪络电压随风速的增加先增大后减小,有沙尘时复合绝缘子的闪络电压要比无沙尘时低 ...
曹桂, 王同来, 曹保江, 吴广宁, 董海波, 吴立伟   +5 more
doaj  

北方农牧交错带土壤风蚀沙化影响因子的风洞试验研究

Shuitu Baochi Xuebao, 2004
土壤风蚀沙化是北方农牧交错带农牧业生产与发展的主要限制因子,通过室内风洞实验研究,定量分析了土壤风蚀率(风蚀强度)与风速及土壤水分的相关关系、土壤风蚀输沙量的空间分布规律以及翻耕后土壤风蚀的动态变化。结果表明:风蚀率与风速变化成正相关,随着风速增大,风蚀率相应增加,18m/s风速是风蚀由轻变重的一个转折点;土壤水分与风蚀率呈负相关,水分含量越高,风蚀率越小,6%含水量水平是土壤风蚀由重变轻的一个转折点。通过曲线拟合表明,风蚀率与风速成幂函数的关系,与土壤水分含量成对数函数关系 ...
何文清 高旺盛 妥德宝 赵沛义
doaj  

[Prior knowledge-guided and border-focused segmentation of ischemic stroke lesions]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Cui W, Wen Z, Shao H.
europepmc   +1 more source

[Case of tooth autotransplantation with robotic surgery assistance]. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi
Liu Y, Song J, Chen X, Zhang C, Chen S, Zhang J, Gu Z.   +6 more
europepmc   +1 more source

[<i>Qingre Lidan Jiedu</i> Recipe improves high copper load-induced cognitive dysfunction in rats by regulating mitophagy]. [PDF]

Nan Fang Yi Ke Da Xue Xue Bao
Wang Y, Fang X, Chen Z, Ruan B, Han X, Tang Y, Zhu L.   +6 more
europepmc   +1 more source

[Accuracy of dynamic navigation-assisted trephine method for bone harvesting]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Liu J, Zhu N, Chang Y, Gao X, Zhang Y.
europepmc   +1 more source

[Invasive pulmonary aspergillosis assisted in clinical diagnosis by chest CT pulmonary angiography: three cases report]. [PDF]

Zhonghua Xue Ye Xue Za Zhi
Tian DM, You JH, Hu J, Wang L.
europepmc   +1 more source

Prediction of pulp exposure risk of carious pulpitis based on deep learning. [PDF]

Hua Xi Kou Qiang Yi Xue Za Zhi, 2023
Wang L, Wu F, Xiao M, Chen YX, Wu L.
europepmc   +1 more source

[Guideline for allogeneic hematopoietic stem cell transplantation in the treatment of transfusion-dependent thalassemia in China (2026)]. [PDF]

Zhongguo Dang Dai Er Ke Za Zhi
Committee of Thalassemia Prevention and Treatment, China Maternal and Child Health Association, Subspecialty Group of Hematology, Society of Pediatrics, Chinese Medical Association, China Thalassemia Prevention and Control Collaboration Network, Editorial Board of Chinese Journal of Contemporary Pediatrics.   +6 more
europepmc   +1 more source

[Advances in radiomics for early diagnosis and precision treatment of lung cancer]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Li J, Luo W, Wang Z, Li W.
europepmc   +1 more source