Results 41 to 50 of about 19,501 (173)
Gaoya dianqi, 2022 高压直流断路器(high voltage DC circuit breaker,HVDC CB)的全开断时间对高压直流输电系统有着至关重要的影响。文中基于人工过零型机械式高压直流断路器对断路器的分断过程进行分段研究，利用L-C回路产生的低频振荡电流模拟开断故障电流，通过PSCAD/EMTDC电磁仿真软件对高压直流断路器的开断过程进行仿真实验，并通过仿真实验探究影响断路器全开断时间的主要因素。结果表明，减少换流支路的电容值、调整避雷器的参考电压以及减小换流回路的投入时刻可以减少高压直流断路器的全开断时间 ...
冯胜, 淡淑恒
doaj
Governance of Climate‐Induced Relocation in the US: An Exploration of Institutional Complexity
Review of Policy Research, Volume 43, Issue 2, March 2026.ABSTRACT Climate change has and will continue to have a profound effect on both individuals and the communities in which they reside. A pressing question is how communities forced to confront climate‐induced catastrophe—including both rapid and slow‐onset hazards—undertake the decision of how and when to relocate, particularly given the multiple scales
Christopher S. Galik, Brad A. Johnson
wiley +1 more source
Gaoya dianqi, 2015 提出了一种由直流后备式熔断器和直流真空负荷开关串联组成的直流组合电器,对其直流开断特性进行了仿真和实验研究。新型直流组合电器可完成直流电流的全范围开断:当开断额定电流和过载电流时,采用真空直流负荷开关利用人工电流过零法开断电流,此时后备式熔断器不动作;当开断大过载电流和短路电流时,采用后备式直流熔断器直接开断大电流,也可以将大电流限制至较低幅值再采用真空直流负荷开关进行分断。实验结果证明,该直流真空负荷开关可以在5 ms内成功开断200 A至1.7 k A的直流电流,直流后备式熔断器可以开断1.7 k ...
刘思远 +7 more
doaj
Gaoya dianqi, 2020 电力系统短路电流中直流分量的衰减时间常数超过现有断路器的标准时间常数将导致断路器实际开断能力下降,因此亟需研究直流分量对高压断路器的影响以准确评估其开断能力,防止开断失败造成重大损失。文中提出基于KEMA电弧模型研究SF6断路器直流分量开断能力的方法。首先,将KEMA模型引入直流分量开断仿真中,给出额定开断能力对应的临界电弧参数获取方法,然后使用临界参数仿真实际含更高直流分量的短路电流,最后用该方法验证宁夏电网断路器的实际开断能力。研究结果表明,当断路器的额定开断能力包含20%的直流分量时 ...
丁培 +6 more
doaj
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The high accuracy in surface‐enhanced Raman scattering‐lateral flow immunoassays (SERS–LFIAs) is critical for reliable point‐of‐care testing (POCT) in clinical diagnostics. Conventional approaches are often affected by sampling variability and uneven distribution of immunoprobes, leading to unreliable signal fluctuations.
Shuai Zhao +9 more
wiley +1 more source
Gaoya dianqi, 1995 [问]何谓负荷开关—熔断器组合电器? [答]负荷开关—熔断器组合电器一般是指由三极负荷开关和三个带撞击器的熔断器组合而成的电器,当任何一个撞击器动作时,负荷开关的三级皆全部自动分闸。 此组合电器工作时,通常由负荷开关担任关合和开断工作电流和较小倍数的过载电流,而由熔断器开断较大倍数的过载电流和短路电流。 [问]负荷开关—熔断器组合电器的熔断器上为何要安装撞击器?
涟生
doaj
Avoidance distance and influence range of active faults: A case study of Litang fault [PDF]
Objective Active faults can not only trigger strong earthquakes, but also cause engineering breaks, creep deformation, and geological disasters, which seriously threaten the planning, construction, and safe operation of major projects.
GUO Changbao +5 more
core +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT In recent years, the field of magnetic materials has witnessed a paradigm shift from single‐function applications to multifunctional integration, driven by the growing demand for smart materials in advanced technologies. Among various magnetic systems, La(Fe, Si/Al)13‐series materials have emerged as particularly promising candidates due to ...
Irfan Liaquat +2 more
wiley +1 more source
Ultrasound in Obstetrics &Gynecology, Volume 67, Issue 2, Page 207-219, February 2026.ABSTRACT Objective To test the non‐inferiority of extended abdominopelvic ultrasound examination compared with contrast‐enhanced computed tomography (CT) and whole‐body diffusion‐weighted magnetic resonance imaging (WB‐DWI/MRI) in discriminating preoperatively between resectable and non‐resectable disease based on the European Society for Medical ...
D. Fischerova +26 more
wiley +1 more source
Extraction mode and engineering demonstration of pressure relief three-dimensional of multi-coal seams in Pingdingshan mining area [PDF]
There are many coal seams and gas-bearing strata in Pingdingshan mining area, and the amount of underground gas control project is large and difficult.
Jinsheng JIA, Xiaoming NI, Yanhe LI
core +1 more source