Results 51 to 60 of about 25,216 (138)
Dianci bileiqi, 2019 为了解决配电网中性点接地方式具有的人身安全、接地选线及供电可靠性问题,开发了基于故障相智能接地处理方式的配电网多功能安全接地处理装置,该装置采用了铁磁谐振动态预警判断技术、分区式故障相选相技术、故障性质的智能判断与处理技术和自适应接地选线技术解决了配电网铁磁谐振动态预警、判断与处理,解决了过渡电阻接地时的精准选相,解决了故障性质的智能判断与处理,能使瞬时性故障快速恢复,使永久性故障选线精确率提高到百分百,能处理0-2 000 A的故障电流。装置经在电网的试验及运行效果证明 ...
李政洋 +4 more
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Zhejiang Daxue xuebao. Lixue ban, 2016 为在方案设计初期与工程造价相关信息很少的条件下，准确快速地预测住宅工程造价，在分析既往相关理论和方法优劣的基础上，选取支持向量机构建住宅工程造价预测模型，并通过主成分分析对原始数据进行降噪处理.选取住宅工程造价预测指标集与样本，对输入指标的数据进行主成分分析，消除指标相关性的同时对原始数据降维，将处理后的数据分别导入到“标准支持向量机”和“最小二乘支持向量机”模型中进行训练和预测，并对预测结果进行对比分析，选取较为合理的预测模型，通过参数寻优进一步优化预测效果.所构建预测模型的相对误差均控制在±7%以内，
QINZhongfu(秦中伏) +3 more
doaj +1 more source
Policy &Internet, Volume 18, Issue 1, March 2026.ABSTRACT With the rise of AI, concerns about its potential for manipulation in political communication have intensified, accompanied by discussions about regulatory measures. Research has explored perceptions of risks and preferences regarding AI use and regulations among the general population, and in fields such as journalism.
Tobias Scherer +3 more
wiley +1 more source
Policy &Internet, Volume 18, Issue 1, March 2026.ABSTRACT Over the past two decades, Voting Advice Applications (VAAs) have become widely used tools that provide personalized political information to help voters make informed choices and strengthen democratic processes. However, little research has examined their potential unintended effects.
Marius Fröhle +4 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Cost‐effective and efficient non‐noble‐metal catalysts for selective lignin hydrogenolysis remain elusive, representing a significant challenge in biorefinery. Here, we prepared a nitrogen‐doped carbon supported CoNi bimetallic catalyst, which was successfully derived from zeolitic imidazolate framework (ZIF) via high‐temperature pyrolysis ...
Xingwei Luo +3 more
wiley +1 more source
Electrolyte With Functionalized Boron Nitride Nanosheets for Dendrite‐Free Lithium Metal Anodes
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Lithium metal batteries (LMBs) are regarded as promising candidates for the next‐generation high‐energy‐density storage systems due to their unparalleled theoretical energy density and low redox potential. However, the commercialization of LMBs is tremendously plagued by the barbaric growth of lithium dendrite and the intricate decomposition ...
Ji Zhou +5 more
wiley +1 more source
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT As a promising alternative to sluggish Li2CO3‐based Li‐CO2 electrochemistry, Li2C2O4 offers a favorable 2e− discharge pathway, yet its selective formation and reversible decomposition remain debated. Herein, we propose a nonmetal‐metal synergistic catalyst—B‐Ti coregulated layered transition metal boride Ti18B18O9/graphene (B‐Ti/TiBOG)—to ...
Qiong Peng +8 more
wiley +1 more source
110 kV沙土变同等条件下不同中性点接地设备故障处理对比试验及其分析
Dianci bileiqi, 2018 2015年10月,国网江西省电力公司赣西供电分公司在同等条件下分别对自动消弧线圈和ZXC系列主动干预型故障相转移接地装置做了单相瞬时性接地故障、单相永久性接地故障处理试验。试验结果表明:自动消弧线圈由于补偿后的残流控制的不好,不能及时熄灭瞬时性接地电弧,对永久性接地故障接地选线的准确率仅为33%;ZXC系列主动干预型故障相转移接地装置能及时消除瞬时性接地故障,选线准确率达100%,能及时选出并切除永久性接地故障。确保了故障点的安全。
晏锋
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Dianci bileiqi, 2022 目前，我国城市中低压配电网电容电流骤增且消弧线圈补偿能力不足问题突出，为解决由此带来的单相接地故障电弧难以自熄问题，故障相接地消弧技术在配电网逐渐开展试用，故障相准确辨识是该技术可靠熄弧的基础。本研究分析故障后三相电压暂态信号，得到故障相暂态电压波形与非故障相极性相反的特征，提出利用故障相和非故障相暂态电压波形相似度判断故障相的方法；采用Matlab&Simulink建立10 kV典型配电网模型和电弧故障模型，并在不同中性点接地方式下改变过渡电阻、故障点距离、故障相角、间歇性接地等弧光接地故障条件 ...
李景丽 +4 more
doaj
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Precise control of chemical ordering in bimetallic nanocatalysts offers a route to decouple activity and selectivity in acetylene hydrogenation, but direct atomic‐scale evidence linking surface order to catalytic performance is scarce. Here, we tune Pd‐Cu nanoalloys from chemically disordered to highly ordered states by composition control and
Fan Xue +5 more
wiley +1 more source