Results 41 to 50 of about 6,439 (163)
Gaoya dianqi, 1993 通过对旋弧式灭弧装置中电弧电流过零后弧隙中介质自由恢复过程的测量,得到了和SF6气吹灭弧方法相似的介质自由恢复特性。并首次揭示了介质自由恢复特性和电弧电流之间的关系,以及导磁材料的存在对介质强度恢复过程的影响。
郭文元, 王东
doaj
Rare Metals, Volume 44, Issue 1, Page 404-416, January 2025.Graphical abstractTOC (Table of Content) AbstractTwo‐dimensional (2D) metal oxides (2DMOs), such as MoO2, have made impressive strides in recent years, and their applicability in a number of fields such as electronic devices, optoelectronic devices and lasers has been demonstrated. However, 2DMOs present challenges in their synthesis using conventional
Li‐Ying Deng +15 more
wiley +1 more source
Low temperature sintering of Ba_5(Nb_(1-x)Sb_x)_4O_(15) microwave dielectric ceramics [PDF]
, 2007 添加质量分数为1%的H3BO3为助烧剂。研究了Ba5(Nb1–xSbx)4O15(0≤x≤0.2)陶瓷的烧结特性、显微结构和微波介电性能。结果表明:当x≤0.15时,该类陶瓷可在900℃附近烧结,并伴有少量BaSb2O6和BaB2O4相;随着x从0增加到0.2,εr和τf均有较大幅度下降;Q.f先升后降。在900℃烧成温度下,x为0.15的陶瓷获得较好的微波介电性能:εr为29.21,Q.f为13 266 GHz,τf为11×10–6℃–1,并能与Ag电极很好相容,基本满足LTCC工艺的要求。The ...
张冲, 熊兆贤, 肖芬, 邱虹
core +3 more sources
Gaoya dianqi, 2012 到目前为止,已有大量文献介绍了各类绝缘子的人工污秽试验结果,少有文献涉及交直流人工污秽试验电源的特性试验研究。特高压交直流污秽试验电源电压高,电源特性实现难度大,因此需要对电源特性进行试验研究,探索交直流污秽电源的参数特性及其规律。昆明特高压实验室污秽实验室开展了一系列特高压交直流污秽电源的特性试验研究。研究成果一方面为人工污秽试验的理论研究和工程应用提供依据,同时为待建或已建交直流污秽试验电源的特性试验研究提供参考。文中说明了污秽交直流试验电源的工作原理和性能要求 ...
丁薇 +4 more
doaj
Researching the extinction properties of noble metal nanoparticles via discrete dipole approximation [PDF]
, 2003 本文运用离散偶极近似理论(DDA)，计算球状、棒状与椭球状的贵金属(金、银)纳米粒子的消光光谱。首次系统地研究粒子的形状、尺寸、周围介质的介电系数及粒子的材料对贵金属纳米粒子消光性质的影响，并对形状的影响与介电常数的影响作出相应的理论解释。 利用Na3C6H5O7还原HAuCl4的方法，制得不同粒径的金纳米球，观测相应的UV/VIS吸收光谱，从实验上分析粒子的大小对UV/VIS吸收光谱的影响，并用DDA理论与Mie’s理论对该实验光谱进行模拟发现 ...
李秀燕
core
Policy &Internet, Volume 16, Issue 3, Page 485-508, September 2024.Abstract During the COVID‐19 pandemic, some groups and individuals rearticulated state power through conspiracy theories. Despite their fringe status, conspiracy theory beliefs can directly animate citizen's engagements with institutions. Drawing on Barkun's ‘conventional’ and ‘stigmatised’ knowledge types, we analyse the appearance of conspiracism in ...
Ben Lyall, Patrick Marple
wiley +1 more source
Gaoya dianqi, 1997 对影响真空断路器高频电流开断特性的一些因素做了介绍。认为这些因素的综合效应决定了真空断路器的高频电流开断特性;电流在零值附近的变化率和触头间隙在电流开断后的介质恢复速率是影响真空断路器高频电流开断性能的决定性参数。并指出了利用计算机模拟的方法研究真空断路器高频电流开断特性的必要性。
阿路·土尔斯别克, 王毅
doaj
Characteristics of electric field strengthening between coal-mineral particles under microwave irradiation [PDF]
Both thermal and non-thermal effects induced by microwave radiation can produce a series of effects on coal and rock, and microwave induced discharge is one of the phenomena of microwave non-thermal effects.
Fuqiang YANG +5 more
core +1 more source
Gaoya dianqi, 2018 与交流不同,直流电压下气固绝缘系统的电场分布取决于电介质的电导率。在绝缘系统电场由容性转化为阻性的同时,电荷在气固介质交界面积聚而改变了原有电场,导致其沿面闪络特性下降,制约着直流GIS的工程应用。目前关于直流GIS绝缘介质电场的仿真和试验研究已成为国际上的热点,文中对此进行系统性的综述,包括:GIS直流电场的数学计算模型,不同介质的电气特性,GIS绝缘子表面电荷测量方法,表面电荷测量系统等。最后,对直流GIS相关仿真和试验研究工作给出了建议。
钟建英 +4 more
doaj
Effects of Low Voltage Electrostatic Field Combined with Low Temperature and High Humidity Thawing on Beef Tenderness and Water Retention [PDF]
To investigate the effects of a low-pressure electrostatic field combined with low temperature and high humidity on beef tenderness, this study utilized bovine longissimus dorsi muscle as the experimental material.
Chunhui ZHANG +5 more
core +1 more source