Results 51 to 60 of about 15,045 (168)
Rare Metals, Volume 45, Issue 4, April 2026.ABSTRACT Metal oxide‐based catalysts for oxygen reduction reaction (ORR) have drawn great attention in recent years. However, it remains technically challenging for the precise regulation of the overall performance due to the trade‐off effect among the activity, selectivity, and stability of electrocatalysts. Herein, a balancing strategy to control the
Haoran Ma +7 more
wiley +1 more source
Gaoya dianqi, 2012 SF6气体在设备发生绝缘故障时,可生成SO2、H2S等分解产物。随着检测技术的发展,可将此类分解产物作为故障诊断的特征气体。笔者首先介绍了SF6分解物生成的相关机理和研究现状,回顾了分解物的测试技术以及设备故障诊断模型,进而分析了该技术目前存在的主要问题。通过SF6分解物检测技术,确认了2台500 kV SF6 CT内部绝缘故障,为设备故障诊断提供了有效的检测手段。
廖建平, 骆晓龙
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质谱和动力学技术研究胰岛素-多糖纳米粒稳定性和释放胰岛素速率 [PDF]
, 2007 以海藻酸钠(sodium alginate,SA)和壳聚糖(chitosan,CS)为纳米粒包被材料,构建胰岛素(insulin,INS)多糖纳米粒.采用基质辅助激光解吸电离飞行时间(Matrix-assisted laser desorption ionization/time of flight,MALDI-TOF)质谱技术研究若干化学因素影响INS-多糖纳米粒的稳定性.选用电子光谱技术研究INS-多糖纳米粒控释INS速率及动力学特性.实验结果表明,INS-SA纳米粒在Tris-HCl缓冲液(pH7.
方雪萍 +4 more
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Functional Ecology, Volume 40, Issue 4, Page 983-1000, April 2026.Read the free Plain Language Summary for this article on the Journal blog. Abstract Organic phosphorus mineralization is a critical process in the phosphorus cycle, governing phosphorus bioavailability for plants. The PhoD gene, which encodes the key enzyme alkaline phosphatase, serves as a valuable biomarker for this process.
Sandhya Mishra +3 more
wiley +1 more source
Genomic responses to increased temperature and pollinator selection in Brassica rapa L.
New Phytologist, Volume 250, Issue 2, Page 1231-1247, April 2026.Summary Rapid environmental change reshapes both abiotic stress and biotic interactions, yet it remains unclear how these combined forces structure plants' genomic adaptation. In particular, the joint influence of temperature and pollinator identity, two ecological axes undergoing simultaneous global shifts, has rarely been quantified at genomic ...
Yanqian Ding, Florian P. Schiestl
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Gaoya dianqi, 2011 通过检测GIS设备中SF6气体分解产物对设备内部绝缘进行故障诊断和状态评估,具有抗干扰能力强、灵敏度高等特点,正在被应用于设备现场检测分析。笔者分析了SF6分解产物不同检测方法的特点,选用适合现场检测的方法和仪器,对耐压试验后的设备进行气体成分分析,根据SF6分解产物的组分及体积分数进行设备的状态评价和故障诊断。
季严松 +5 more
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Effect of Fluoroethylene Carbonate Additive on the Performance of Lithium Ion Battery [PDF]
, 2009 在1MOl·l-1lIPf6/碳酸乙烯酯(EC)+碳酸二甲酯(dMC)+碳酸甲乙酯(EMC)(EC、dMC、EMC体积比为1∶1∶1)电解液中加入体积比为2%的添加剂氟代碳酸乙烯酯(fEC),用循环伏安法(CV)、扫描电镜(SEM)、能量散射光谱(EdS)、电化学阻抗谱(EIS)等方法,研究了fEC对锂离子电池性能及石墨化中间相碳微球(MCMb)电极/电解液界面性质的影响.结果表明,体积比2%fEC的添加可以抑制部分电解液溶剂的分解,在MCMb电极表面形成一层性能优良的固体电解液相界面(SEI)膜 ...
姚万浩 +4 more
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Gaoya dianqi, 2019 C5F10O作为潜在的SF6替代气体近年来得到了广泛关注,目前针对其分解特性的研究较少。文中采用密度泛函理论分析了微量水分对C5F10O分解特性的影响情况。首先计算了微水环境下C5F10O可能的分解路径及焓值,其次讨论了分解产物的电离参数。研究发现水分子解离产生的H和OH与C5F10O分解产生的C3F7、CF3等自由基反应会产生C3F7COH、C3F7OH、CF3COH、C3F7、CF3OH、CF2O等物质,上述分解产物的电离参数较弱,且CF2O和HF属于有毒物质。微水的存在将促进C5F10O的分解 ...
李应文 +4 more
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Effect of Fluoroethylene Carbonate Additive on the Performance of Lithium Ion Battery [PDF]
, 2008 Fluoroethylene carbonate (FEC) with a volume ratio of 2% was added to the electrolyte containing 1 mol L-1 LiPF6, in ethylene carbonate (EC), dimethyl carbonate (DMC), and methyl ethyl carbonate (EMC) (1: 1: 1 by volume).
Wang, Zhou-Cheng +9 more
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Gaoya dianqiSF6设备内局部过热故障会产生全氟碳烃类特征分解产物。为了探明氟碳烃分解产物与PTFE热分解劣化过程的内在联系，本研究采用同步差示扫描量热/热重/色谱联用技术，构建可追踪到氟碳烃分解产物的六氟化硫热分解反应模型。系统地将热解升温速率/分解温度/分解产物体积分数条件与实验确定的特征分解产物/绝缘材料侵蚀联系起来，阐明了500～600 ℃温度区间SF6-PTFE热分解形成六氟乙烷、八氟丙烷的化学反应历程。该结果可直接应用于局部过热故障造成的断路器喷口侵蚀进行定性定量检测 ...
杨韧 +5 more
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