Results 21 to 30 of about 3,998 (153)
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
doaj
Gaoya dianqi, 2023 为了防止柔性直流输电系统在双极短路故障下过大的短路电流损坏输电系统，且考虑到过大的短路电流也会损坏断路器的避雷器，文中提出了一种可开断故障电流且有效减小避雷器吸能的直流断路器。利用PSCAD搭建了含卸能电阻的直流断路器模型和三端±350 k V柔性直流输电系统模型。在双极短路故障下，通过仿真对比分析了此模型与理想直流断路器模型和不含卸能电阻的直流断路器模型的区别。文中发现，含卸能电阻的直流断路器与理想直流断路器相比更容易切断故障电流，与不含卸能电阻的直流断路器相比有效减小了避雷器吸能。并且 ...
田小健, 丁璨, 聂太平, 袁召
doaj
New Generation High-Performance VSC-HVDC Back-to-Back Technology and Application in Project [PDF]
, 2023 [Introduction] Due to the dense load, complex grid structure, and close electrical connections in the Guangdong power grid area, there are three major problems for a long time: the risk of large-scale power outages, the interaction between AC and DC, and
Bo ZHU +5 more
core +1 more source
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
Growth of high quality perovskite films based on kinetic manipulation and investigation on their photovoltaic performances [PDF]
, 2016 全固态钙钛矿型太阳能电池(Perovskitesolarcells，PSCs)，主要由有机金属卤化物钙钛矿结构材料构成，由于其较高的光电转换效率、相对低的制备成本及简便的制备工艺，在太阳能有效利用方面展现出巨大的应用前景，尤其在最近两年获得了迅猛的发展。钙钛矿太阳能电池要逐渐走向商业化，低成本、大面积、高质量钙钛矿薄膜的空气氛围制备显得尤为重要。本研究以高质量钙钛矿薄膜的制备为重点，着眼于生长调控，借助于反应动力学优化、界面工程、溶剂工程以及热力学控制，从多个角度调控和优化钙钛矿薄膜的结晶过程 ...
尹君
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Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Moisture‐enabled electricity generation technology offers a new paradigm for sustainable energy harvesting, but its practical applications are still limited by issues such as low output power and insufficient long‐term stability. In this paper, an asymmetric sandwich‐structured hydrogel moist–electric generator (SSHMEG) with an ion ...
Peng Chen +7 more
wiley +1 more source
The Preparation of BaTiO3 Platelets and Its Application on Flexible Piezoelectric Generator [PDF]
, 2016 本论文采用熔盐法合成了(001)择优取向生长的BaTiO3片状微晶体，利用油/水界面自组装的方法获得了具有高度取向性的压电薄膜，并将其制备成柔性压电发电机用于收集环境机械能。 利用熔盐法在1050℃合成了平板状结构的Bi4Ti3O12和BaBi4Ti4O15片状晶体作为前驱体，熔盐介质分别为NaCl-KCl和KCl-BaCl2；然后，在拓扑化学反应阶段Ba2+替代BaBi4Ti4O15中的Bi3+形成钙钛矿相的BaTiO3，反应温度为950℃，熔盐体系为NaCl-KCl ...
高涛
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Expanding near‐infrared (NIR) spectral response and utilizing ultraviolet (UV) photons are effective strategies for enhancing the power conversion efficiency (PCE) of lead halide perovskite solar cells (PSCs). However, the range of NIR spectral response extension and the utilization of UV light for devices are not enough, and the loss of ...
Li He +9 more
wiley +1 more source
Study of vertical structure InGaN/GaN MQWs solar cells [PDF]
, 2015 近年来，以氮化镓（GaN）、氮化铝（AlN）和氮化铟（InN）为代表的第三代半导成为国际研究热点。它们具有吸收系数高、迁移率高、抗辐射能力强等特性，是很好的光伏材料。合金材料InGaN的带隙可调，其光谱响应区域可覆盖大部分太阳光光谱，是高效率太阳能电池的理想材料。垂直结构的InGaN太阳能电池具有电流分布均匀且可通过生长底部反射镜的方法减少光透过损失的特长受到极大关注。在本文研究中，我们对垂直结构InGaN/GaN多量子阱太阳能电池的制作、性能测试和理论模拟进行了详细的研究。具体内容如下： （1 ...
余健
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How Many Floods Have Occurred in China in the Past Decade? A Perspective From Social Media
Earth's Future, Volume 13, Issue 4, April 2025.Abstract Global climate change has led to frequent and widespread flood disasters in China. Traditional flood disaster investigations mainly focus on major flood events, and small‐scale flood events are often overlooked. This study utilized the Sina Weibo social media platform to detect flood events in 370 cities in China from 2012 to 2023.
D. Shen +5 more
wiley +1 more source