Results 101 to 110 of about 29,284 (225)

Development of thermodynamic database of Mg base electrode materials and its applications in alloy Design [PDF]

open access: yes, 2016
镁合金具有密度小,理论比容量大,标准电极电位负、电压范围广等优点,因此作为阳极材料被广泛应用于化学电源中。目前,镁基阳极材料还存在极化严重、阳极利用率低、激活时间长等不足。传统镁基阳极材料的开发以“尝试法”为主,研发周期长,浪费了大量人力和物力,严重阻碍了镁基阳极材料的发展。2011年,随着“材料基因组”计划的的提出,研究者希望通过材料的设计来开发新型镁基材料。相图作为“材料基因组”中的重要组成部分,受到越来越多研究者的关注。目前为止,已报道的镁基阳极材料相平衡信息相对匮乏,有必要对其相平衡信息进行完善,
王东
core  

The Role of Technology Standards in Strategic Hedging

open access: yesAsian Politics &Policy, Volume 18, Issue 2, April 2026.
ABSTRACT This article argues that technology standards provide Southeast Asian states with a distinct mechanism for hedging amid intensifying US–China technological rivalry. Traditional hedging strategies emphasizing economic engagement without political alignment are increasingly constrained by the weaponization of technological interdependence ...
Darren J. Lim, Anthea Roberts
wiley   +1 more source

Studies of Electrochemical Performances of Silicon Anodes of Lithium-Ion Battery with Exploring Novel Binders and Si/C Composite Materials [PDF]

open access: yes, 2015
硅是容量最高的锂离子电池负极材料,理论容量达到4200mAhg-1。但在充放电循环过程中,硅材料发生巨大的体积变化,导致其循环性能差。本论文通过制备特殊结构的硅/碳(Si/C)复合材料和开发新型粘结剂来改善锂离子电池硅基负极的电化学性能。主要结果如下: 一、开发了两种新型的锂离子电池硅基负极粘结剂:(1)利用海藻酸钠和钙离子的交联反应,制备出一种高机械性能的海藻酸水凝胶粘结剂,能够在充放电过程中有效地维持Si/C复合电极的结构稳定性,从而显著地提高其循环性能,经过120周充放电循环后,Si ...
刘杰
core  

Lessons learned from screening potential other effective area‐based conservation measures

open access: yesConservation Biology, Volume 40, Issue 2, April 2026.
Abstract Other effective area‐based conservation measures (OECMs) are sites that deliver effective biodiversity outcomes irrespective of their management objectives. These areas are widely expected to play an important role in efforts to protect 30% of Earth by 2030.
Carly N. Cook   +15 more
wiley   +1 more source

Photogenerated Cathodic Protection Properties Based on Micro-nano ZnO/TiO2 Composite Films [PDF]

open access: yes, 2015
金属腐蚀问题给人们生活带来不便,且造成巨大的经济损失。传统金属防腐蚀方法均存在一定的缺陷。因此开发低能耗、环境友好型的金属防腐蚀技术具有重要的科研及应用意义。基于微纳米ZnO、TiO2优异光电化学性能的新型防腐技术--光生阴极保护技术已引起人们的广泛关注。但ZnO、TiO2只能吸收紫外光,光生载流子易复合,且暗态下难以持续对金属进行阴极保护。因此,本文采用工艺操作简便、常压低温条件下的湿化学方法制备ZnO阵列及对其进行TiO2、Fe-TiO2复合薄膜修饰耦合 ...
刘宇
core  

Use of species’ responses to cryptic anthropogenic disturbances for monitoring biodiversity outcomes in tropical forests

open access: yesConservation Biology, Volume 40, Issue 2, April 2026.
Abstract Measuring area‐based conservation outcomes in tropical forests is challenging due to cryptic human disturbances (e.g., hunting). As a result, comparative studies of management strategies providing quantitative outcomes remain scarce, especially in the Neotropics.
Lucy Perera‐Romero   +5 more
wiley   +1 more source

油纸绝缘结构介质响应电路模型的参数辨识方法研究

open access: yesGaoya dianqi, 2012
介质响应法能够有效地无损诊断油纸绝缘结构的老化状态。油纸绝缘结构的介质响应电路模型的参数辨识是介质响应法评估老化状态的关键。笔者根据介质响应的极化过程的特点,提出利用去极化电流辨识油纸绝缘结构的扩展徳拜模型,并通过分析去极化电流的形成和扩展徳拜模型的特点,将多指数拟合问题转化成单指数拟合问题,同时将模型中RC支路的时间常数转换成直线的斜率来求解。最后,笔者基于1台110 kV变压器的实测去极化电流曲线,用文中的方法辨识出其扩展徳拜模型,并在MATLAB中仿真了所得扩展徳拜模型的去极化电流曲线 ...
王骞, 臧春艳, 张明丽
doaj  

Three-Dimensional Nanostructured Anode Materials and Their Properties for Lithium-ion Battery [PDF]

open access: yes, 2010
开发新型高容量电极材料是发展新一代锂离子电池的核心,其中金属氧化物和Sn基合金材料具有很高的容量是研究的热点之一。然而金属氧化物和Sn基合金材料在锂离子的嵌脱过程中都发生巨大的体积变化,使容量的快速衰减,从而导致其循环性能很差。因此,如何减小或抑制材料由于锂离子的嵌脱引起的体积变化所带来的容量快速衰减是一个极大的挑战。 针对金属氧化物和Sn基合金材料存在的上述问题,本论文通过构筑三维结构(包括三维纳米带阵列结构和三维多孔结构)纳米材料来显著提高它们的循环寿命。三维结构纳米材料电极具有以下优点:(1 ...
柯福生
core  

Success of restoration strategies in preventing extirpation of 2 critically endangered coral species

open access: yesConservation Biology, Volume 40, Issue 2, April 2026.
Abstract An unprecedented marine heatwave in 2023 caused widespread coral bleaching and mortality throughout the Caribbean. In the Florida Keys (USA), 2 foundation species, elkhorn coral (Acropora palmata) and staghorn coral (Acropora cervicornis), were severely affected.
Erinn M. Muller   +29 more
wiley   +1 more source

新型非去极化肌松药—米库氯铵

open access: yesZhongguo shiyan zhenduanxue, 2013
米库氯铵(mivacurium chloride)是苄异喹啉类短效非去极化神经肌肉阻滞药,是自1975年savarese等提出理想肌松药概念以来,符合理想肌松药的一种新型短效非去极化肌松药。肌松药是作用于神经肌肉接头前膜及后膜(终板)烟碱样乙酰胆碱受体的药物。肌松药作用于神经肌肉接头后膜受体,阻滞了神经肌兴奋的正常传递,产生肌肉松弛。目前肌松药作为全麻的基础用药,根据其作用机制不同分为去极化肌松药和非去极化肌松药两大类。去极化肌松药目前国内常用为氯化琥珀胆碱,琥珀胆碱在临床应用中常常出现心律紊乱 ...
吕慧   +4 more
doaj  

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