Results 31 to 40 of about 8,910 (170)
Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Platinum (Pt)‐based catalysts are crucial for the commercialization of hydrogen/metal air batteries, but they suffer from Pt scarcity, high cost, and nanoparticle dissolution/agglomeration, mainly leading to performance degradation. We address this by synthesizing a PtFe alloy catalyst (PtFe–PA–NC) via a phytic acid (PA) assisted pyrolysis ...
Chenyang Shu +9 more
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Rare Metals, Volume 45, Issue 3, March 2026.ABSTRACT Tellurium (Te), emerging as a promising alternative to sulfur (S) and selenium (Se), offers significant advantages for potassium (K) ion storage due to its comparable theoretical volumetric capacity (2619 mAh cm−3) and higher electronic conductivity (∼102 S m−1), which promotes rapid charge transfer and improves reaction kinetics.
Sung Woo Cho +7 more
wiley +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT The sluggish kinetics of the oxygen reduction reaction (ORR) necessitate developing oxygen electrodes with enhanced electrocatalytic activity for practical zinc–air battery applications. In this study, an iron‐doped copper sulfide electrocatalyst (CuFeNS‐PNC) anchored on metal–organic framework‐derived carbon substrates was designed, featuring
Taichong Chitboonyakasem +4 more
wiley +1 more source
Zhongshan Daxue xuebao. Yixue kexue ban, 2017 【目的】三维超声时间空间联合成像技术对早孕期胎儿心脏畸形筛查的临床应用价值。【方法】回顾性分析2013年 1月4日至2016年6月30日在我院行早孕期心脏筛查且产前可疑心脏畸形共87例，与追踪结果比较，分析三维超声时间空 间联合成像技术对心脏畸形诊断的价值，同时分析不同切面包括四腔心切面、左心室流出道切面、右心室流出道切面及三血 管-气管切面的诊断价值。【结果】纳入本研究的87例病例中，包括严重心脏畸形62例（71.3%，62/87）和非严重心脏异常25例 （28.7%，25/87 ...
符小艳
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International Journal of Applied Linguistics, Volume 36, Issue 1, Page 522-539, February 2026.ABSTRACT This paper examines the features of metadiscourse across different teacher moves in university linguistics classroom discourse and the teaching strategies reflected in its use. The results reveal that teachers employ diverse metadiscourse during classroom interactions to support student reasoning.
Jingjie Li, Wenjie Hu
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2012 目前,空心钢管混凝土结构被大量应用和推广,但对其抗震性能的研究却比较少,制约了其在实际工程中的进一步应用。对空心普通和再生钢管混凝土柱的抗震性能进行了试验与有限元研究,首先介绍了3根空心圆钢管混凝土柱在定轴力和水平反复荷载作用下的滞回性能试验,分析了不同混凝土和空心率对试件耗能能力及位移延性等抗震性能的影响,研究表明再生混凝土构件的抗震性能要差于相应普通混凝土,而空心率越大,构件的延性和耗能能力越小。其次,采用有限元软件ABAQUS对空心钢管混凝土压弯构件的荷载-位移骨架曲线进行了大量数值计算 ...
李卫秋, 查晓雄, 余敏
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Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT The design of nanoparticles confined in hollow N‐doped carbon structures is crucial for improving the oxygen reduction reaction (ORR) kinetics, yet achieving this remains a significant challenge. In this work, hollow porous nitrogen‐doped carbon encapsulated FeP/Fe2P (H‐FeP/Fe2P) were successfully constructed via a templating method combined ...
Li‐Xia Wang +8 more
wiley +1 more source
Shiyou jixie, 2012 针对目前的锅炉车套管热洗清蜡方式存在的问题，研究了空心杆热洗技术。空心杆热洗装置主要由热洗三通、空心抽油杆、热洗单流阀及配套的光杆和光杆密封器等组成。洗井单流阀采取侧向岀液、下部预留口袋方式，大幅降低了洗井高压对抽油机载荷的影响，而且空心杆中的污物沉入口袋，防止了杂质对洗井通道的堵塞。现场应用结果表明，空心杆热洗洗井水量少，洗井时间短、效率高，热洗后油井排水期短、产量恢复快。
秦桂云, 刘小波, 杨国锋
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Finding floral and faunal species richness optima among active fire regimes
Conservation Biology, Volume 39, Issue 6, December 2025.Abstract Changing fire regimes have important implications for biodiversity and challenge traditional conservation approaches that rely on historical conditions as proxies for ecological integrity. This historical‐centric approach becomes increasingly tenuous under climate change, necessitating direct tests of environmental impacts on biodiversity.
Zachary L. Steel +8 more
wiley +1 more source
Dianci bileiqi, 2017 强降雨引起的电力系统闪络事故越来越多,因此研究强降雨对电气设备放电特性的影响显得尤为重要。淋雨状态主要由降雨强度、雨水电阻率等因素决定。选取252kV空心复合绝缘子为样品,通过建立模拟淋雨平台,研究了空心复合绝缘子在不同淋雨状态下的操作冲击闪络特性。试验结果表明:空心复合绝缘子在不同雨量下的外绝缘由负极性操作波电压来决定;随着雨水电导率的增加,操作湿闪络电压不断降低,雨水电导率大于1 000μS/cm以后时,操作湿闪络电压降低程度较为平缓并呈现出平稳趋势。
刘志强, 郝宇亮, 申萌, 钟磊
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