Results 21 to 30 of about 438,158 (154)
Dianci bileiqi, 2019 雷电感应过电压导致配电线路发生跳闸或故障的比例要远高于雷电直击,因此需要分析采用线路避雷器对配电线路感应过电压的防护效果。利用EMTP软件编程计算线路雷电感应过电压,分析安装线路避雷器对感应过电压的防护效果,讨论雷电流幅值和雷击点距线路距离、避雷器安装间距、接地电阻对避雷器抑制感应过电压效果的影响。分析结果表明:配电线路安装线路避雷器后能够在一定程度抑制雷电感应过电压;雷电流幅值越高、雷击点距线路近,避雷器抑制感应过电压的效果越弱;避雷器安装间距影响对感应过电压的防护效果,安装越密 ...
罗永志, 王艳辉
doaj
Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT Biodegradable Zn‐based alloys are promising candidates for temporary implants, yet excessive Zn2+ release during degradation may induce cytotoxicity and adverse tissue responses. In this study, Zn‐xBa alloys (x = 0.1 wt%, 0.5 wt%, 1.0 wt% and 3.0 wt%) were developed to achieve controlled corrosion behaviors with improved biocompatibility.
Liu‐Dang Fang +9 more
wiley +1 more source
Dianci bileiqi, 2012 架空配电线路绝缘水平较低,因此雷电感应过电压引起的雷击跳闸率很高。为了分析配电线路感应雷过电压的特性,介绍了感应过电压的计算方法,使用二阶时域有限差分法（FDTD）计算感应过电压,以实际线路为例,分析了线路结构、雷电流参数、大地电导率及负载对感应过电压的影响。结果表明,线路高度的增加会使感应过电压增大;雷电参数对感应过电压计算结果影响较大;当大地电导率小于,其对感应过电压的影响不可忽略,计算分析时应予以考虑;需要对短时呈容性的设备做好防雷保护工作。
刘金亮, 杨彩梅, 林国华
doaj
Dianci bileiqi, 2022 雷击配电线路附近产生的雷电感应过电压极易导致线路发生闪络，需要合理计算线路绝缘闪络风险。本研究根据理论推导线路雷电感应电过压峰值概率密度函数，利用LIOV软件产生感应过电压数据拟合概率密度函数公式，考虑线路绝缘闪络的随机过程和线路交流电压的影响，求取线路雷电感应过电压绝缘闪络风险。研究结果表明：线路雷电感应过电压峰值随着雷电流幅值的增加、雷击点距线路垂直距离的减小而增大；线路雷电感应过电压峰值概率密度区间分布较好地服从对数正态分布特征；线路发生单相闪络 ...
万忠兵 +4 more
doaj
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Managing diabetic wounds requires simultaneously addressing their infectious, oxidative, and regenerative impairments. To address this, this study integrates a piezoelectric BiOCl@CuSe heterojunction (PFM‐verified) into an injectable F127/HA hydrogel, creating an ultrasound‐responsive smart dressing.
Jiayan Guo +5 more
wiley +1 more source
, 1985 将异步电机的定子剖开后平直展开,就得到一直线型的电磁感应器。其三相绕组通以三相电流,产生一个沿着感应器运动的行波磁场,这是我们通常称之为直线电机的感应器。一般谈及的直线电机,不管此感应器是作为固定边还是运动边,另一边总是固体的金属导电板或线圈。我们这里讨论的直线式电磁感应器的作用对象是液态金属,如输送液态金属的电磁流槽、直线型平面电磁泵,线型电磁搅拌器等。它的特点是由于液态金属总有管道或者流槽,且一般温度较高,须有隔热层(保温层),致使其气隙相当大 ...
顾琅
core +1 more source
Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Additive manufacturing, commonly referred to as three‐dimensional (3D) printing, provides the geometric freedom and multi‐material integration needed to build soft medical robots for minimally invasive interventions, prosthetics, and rehabilitation.
Yao Wang +5 more
wiley +1 more source
, 2007 论述压电压力传感器被测量气流加热出现失真的来源．研究结果指出干扰信号来源于传感器前端膜片受热膨胀使晶体片预载荷减载和晶体片升温产生的热电电荷．在传感器前端膜片外表面粘贴塑料薄膜后，则在测量期间可有效防止传感器前端膜片和晶体片被气流加热 ...
吴松, 陈宏, 俞鸿儒, 谷笳华
core +1 more source
Gaoya dianqi, 2020 针对地磁风暴发生时系统电压降低的现象,研究了地磁感应电流引起的直流偏磁对电力系统电压的影响。基于PSCAD/EMTDC平台搭建了地磁感应电流—直流偏磁的仿真模型,并用低频正弦交流电模拟地磁感应电流,记录了变压器无功功率的需求变化和系统的电压,另外研究了地磁感应电流对发电机出力的影响,同时与单极运行直流电流对电压的影响进行对比研究。结果表明,磁感应电流会导致变压器无功需求周期性增多,系统电压周期性降低,最大下降约为10%,同时地磁感应电流会导致发电机有功出力减小、无功出力增大 ...
万毅 +5 more
doaj
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT The development of neuromorphic electronics with visual perception and adaptive capability is highly desirable for advancing artificial vision systems. Herein, we have demonstrated a dual‐plasticity adaptive phototransistor based on IGZO nanofibers that exhibits the perception and dynamic adaptation behavior of rod and cone cells to varying ...
Shanshan Jiang +5 more
wiley +1 more source