Results 11 to 20 of about 920,028 (168)
Gaoya dianqi, 2022 容性电流开断能力，特别是C2级开断能力，已成为断路器满足工程需求的关键指标，因开断过程中易发生重击穿故障而导致试验失败的风险较大，故需对其容性开断能力进行评估。基于容性电流特点，文中采用“恢复电压”及“最小临界电压”评估其开断容性电流能力，且“恢复该电压”低于“最小临界电压”时，断路器具有开断容性电流的能力。采用电场及气流场耦合分析方法，断路器开断性能进行评估，得到试验工况下“恢复电压”均小于“最小临界电压”，表明该断路器具有容性电流开断能力，顺利通过C2级试验验证，进一步表明采用“最小临界电压 ...
郭自豪 +8 more
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Gaoya dianqi, 2023 电网X/R比值增大会导致短路电流直流分量衰减时间常数超出在运断路器标准时间常数或特殊工况时间常数，在电力系统短路电流高直流分量影响下，断路器开断性能受限且无法达到标称的额定开断能力。文中综合考虑非对称短路电流开断过程中断路器燃弧窗口、电弧能量、电流变化率和电压变化率等因素对开断性能的影响，比对不同类型的断路器短路电流开断性能等效折算方法，提出考虑断路器修正系数的基于燃弧区间的非对称短路电流开断能力校核方法，并以电网实际系统的变电站短路电流情况进行实例校核验证 ...
马飞越 +5 more
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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
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420kV及以上高压断路器电寿命试验中SF6气体分解产物及其影响研究
Gaoya dianqi, 2023 断路器承担着切除电力系统短路故障的重要任务，当故障出现时，需要断路器在数十毫秒内开断短路电流，因此断路器的性能对电力系统的安全运行有着重要的影响。SF6气体是高电压等级交流断路器中最常用的灭弧介质，开断短路电流的过程中，SF6会在电弧作用下产生多种分解产物，降低断路器的开断能力。文中通过对5台420 k V及以上高压交流断路器开展电寿命试验，对SF6分解产物进行跟踪测量及分析，研究了SO2等分解产物对断路器开断性能的影响。
王昊 +7 more
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The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
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Governing by Ambiguity: Sociotechnical Imaginaries of Platforms in China
Policy &Internet, Volume 18, Issue 2, June 2026.ABSTRACT Besides clear policy directives, the unresolved and open‐ended elements in policy communication also create discursive politics. This article argues that ambiguity in policy communication reflects the state's exercise of power within a fractured sociocultural landscape.
Fangyu Qing, Ngai Keung Chan
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Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, Volume 40, Issue 3, June 2026.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT The efficacy of immunotherapy in triple‐negative breast cancer (TNBC) is often limited, whereas the immunotherapeutic potential of pyroptosis is frequently undermined by a compensatory surge in mitophagy. To address this challenge, this study developed a reactive oxygen species (ROS)‐responsive and mitochondria‐targeted nanomicelle (POM@CTT ...
Qingqing Dou +6 more
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Rare Metals, Volume 45, Issue 5, May 2026.ABSTRACT Water electrolysis is a promising method for green hydrogen production, but slow hydrogen evolution reaction (HER) kinetics require efficient catalysts. In this study, we develop a Ni3S2/MoS2 heterostructure electrocatalyst using a work‐function‐driven electronic modulation strategy combined with a self‐sacrificial template approach.
Xinxin Zhao +11 more
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT MXenes have been widely investigated as microwave absorption (MA) materials because of their unique properties. This study introduces a terminal bond manipulation strategy to enhance charge transfer and polarization in Ti3C2Tx, optimizing its MA performance.
Xiang Fang +8 more
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