Results 121 to 130 of about 12,978 (169)

直流配电系统闪变检测方法研究

Gaoya dianqi
与交流配电系统一样，表征直流配电系统特征指标的直流电压、直流电流也在时刻变化着且其变化幅度、变化频度均具有很强的随机性，导致接入电网的照明类负载灯光照度的随机变化，引起感受体—人对照度变化的视感即常说的闪变。相比于交流配电系统已有公认的、标准化的闪变测量方法，直流配电系统的闪变测量方法目前还处于研究探讨之中。文中基于直流配电系统的特点，在分析传统交流配电系统平方解调闪变测量方法的基础上提出了一种适用于直流配电系统的去平方解调闪变测量方法；仿真分析表明：该方法准确度高 ...
苏灿, 周文, 胡雪凯, 闫鹏, 孟良, 刘军成   +5 more
doaj  

[Determination of eight ultraviolet absorbers in surface water and wastewater by ultra performance liquid chromatography-triple quadrupole mass spectrometry]. [PDF]

Se Pu
Sun HJ, Zhang BB, Huang MQ, Wang H, Hu GJ, Chen HM.   +5 more
europepmc   +1 more source

[Advances in the Application of Artificial Intelligence in Clinical Microbiological Testing]. [PDF]

Sichuan Da Xue Xue Bao Yi Xue Ban
Li H, Song Z, Zhao Y, Li M.
europepmc   +1 more source

[Super microsurgical lymphaticovenular anastomosis for limb lymphedema: An outcome analysis based on clinical stage and indocyanine green pattern]. [PDF]

Beijing Da Xue Xue Bao Yi Xue Ban
Wu J, Xue Y, Chen S, Guo Y, Liu Y, Zhang W.   +5 more
europepmc   +1 more source

垂直型直流接地极接地性能研究

Dianci bileiqi
直流接地极接地特性的准确计算和定量分析是直流接地极优化设计的基础工作，也是保障直流输电系统正常及故障工况下安全稳定运行的重要基础。本研究基于直流接地极散流物理过程的分析，采用电磁场基本理论，建立了直流接地极接地性能有限元数值计算模型；其中，直流接地极截面尺寸与接地极长度及散流空间尺寸相差104数量级以上，为解决巨大的尺寸差异带来的计算奇异及过大的计算量问题，模型中采用具有虚拟厚度的二维薄壳代替三维接地导体，并对无穷散流空间引入空间坐标变换。在此模型基础上，计算单根垂直性直流接地极散流电场 ...
李景丽, 李传举, 朱子卓, 刘璐瑶   +3 more
doaj  

[Master manipulator of vascular intervention surgical robot based on haptic feedback]. [PDF]

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi
Han G, Sun Z, Tang X.
europepmc   +1 more source

[Effectiveness of lymphaticovenular anastomosis combined with perioperative targeted drainage in treatment of secondary lower limb lymphedema: a prospective randomized trial]. [PDF]

Zhongguo Xiu Fu Chong Jian Wai Ke Za Zhi
Wang X, Du J, Zhang X, Lu S, Zhao L, Cai H.   +5 more
europepmc   +1 more source

[Assessment on data processing methods for nontarget identification of per- and polyfluoroalkyl substances using liquid chromatography-high-resolution mass spectrometry]. [PDF]

Se Pu
Zhang BX, He QW, Han BC, Ma CD, Luo ZJ, Meng XZ.   +5 more
europepmc   +1 more source

云满天厦 [PDF]

, 2016
张亮
core  

[Analysis of portal vein thrombosis formation and risk factors after endoscopic treatment in patients with esophagogastric varices in liver cirrhosis]. [PDF]

Zhonghua Gan Zang Bing Za Zhi
Cui YQ, Li JX, Sun YN, Qiu JP, Zeng QH, Zhao WM, Yi Y, Dong PL, Li P, Zhang SB.   +9 more
europepmc   +1 more source