Results 141 to 150 of about 13,453 (210)
Gaoya dianqi, 2019 为满足某特高压小型化断路器产品提出的M2级寿命试验目标,搭建了包含缓冲压力和位移的测试系统,对断路器配用的超大功率碟簧液压机构进行测试和分析。针对"分闸不到底"的测试结果,采用缓冲压力测试与仿真结合优化设计的方法,在分闸缓冲压力测试与液压系统仿真的基础上,以机构的最大缓冲压力为优化目标对其分闸缓冲参数进行优化,提出缓冲改进方案。改进后,分闸缓冲得到大幅改善,解决了该机构在研制过程中出现的"分闸不到底"故障,断路器顺利通过GB 1984—2014规定的M2级寿命试验验证,达到了产品设计目标 ...
雷琴 +4 more
doaj
产业结构优化水平的度量及其影响因素分析——兼论福建产业结构优化的战略选择 [PDF]
, 2003 我国已经正式加入WTO。如何在新的国际经济环境下调整和优化我国产业结构继续作为热点问题,在学术界引起广泛的关注。本文首先回顾和评价我国学者对产业结构调整和优化问题的研究成果,在此基础上提出一个新的关于产业结构优化的理论解释框架,并利用我国省际统计数据进行实证检验。最后 ...
叶文振, 陈静
core
Rare Metals, EarlyView.ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He +8 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Against the backdrop of global clean energy transition and surging demand for lithium resources, lithium extraction from salt lakes presents unprecedented development opportunities. Nanofiltration (NF) membrane technology, recognized for its efficiency, energy savings, and environmental benefits, demonstrates significant application potential ...
Wen‐Feng Li +5 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT Recently, cobalt/nitrogen co‐doped materials have emerged as heterogeneous catalysts to activate peroxymonosulfate (PMS) and have been applied to advanced oxidation processes for environmental remediation. However, their recyclability and reusability remain major barriers to practical application.
Wen‐Kai Zhu +11 more
wiley +1 more source
Rare Metals, EarlyView.ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan +10 more
wiley +1 more source
Jianzhu Gangjiegou Jinzhan, 2013 凯威特网壳的设计参数主要包括跨度、矢高、环向重复区域份数、径向节点圈数和杆件截面尺寸,每类参数的变化都会引起结构内力的重新分配进而改变结构的受力规律;这5类设计参数相互耦合,但应存在一个"最佳组合"使网壳结构的网格尺寸合理、用钢量最省且受力最为合理。对跨度30～90m、矢跨比1/3～1/7,环向重复区域份数6～12,径向节点圈数6～16的数百个单层凯威特型球面网壳模型进行了截面优化设计,以结构用钢量最省为优化目标,优化过程充分考虑了结构强度、刚度和整体稳定性,得出了凯威特型网壳5类主要设计参数的 ...
陈世英, 鹿晓阳, 綦文, 赵晓伟
doaj
Rare Metals, EarlyView.ABSTRACT Photocatalytic hydrogen production from water splitting is a promising strategy for sustainable and clean energy generation. However, the design of low‐cost, highly active photocatalysts remains a critical challenge. In this study, covalent organic frameworks (COFs) were loaded onto the surface of Cd0.9Cu0.1S to fabricate COF/Cd0.9Cu0.1S ...
Yue Zhao +3 more
wiley +1 more source
Gaoya dianqi针对电气设备常见的电连接器——弹簧触指结构，提出了一种优化弹簧触指结构参数的方法。首先运用仿真软件Comsol Multiphysics建立弹簧触指结构模型，利用有限元方法进行接触压力和接触电阻计算，分析了簧丝直径、弹簧倾斜角、宽高比、弹簧圈数对性能参数的影响。以接触压力和接触电阻作为目标函数，利用遗传算法改进的BP神经网络模型，拟合了弹簧触指结构参数与目标函数之间的关系，从而对弹簧触指结构进行优化设计。在满足弹簧触指结构插拔力要求的条件下，减小弹簧触指结构的接触电阻，降低工作温度，改善了其电接触性能 ...
苏俊天, 淡淑恒
doaj
Rare Metals, EarlyView.ABSTRACT MCrAlX coatings are widely used as bond coats in thermal barrier coating systems to protect turbine blades from high‐temperature oxidation. However, their oxidation resistance is often restricted by uncontrolled microstructures, surface roughness, and aggregation of reactive elements (REs). In this study, high‐repetition‐rate femtosecond laser
Wei Qian +7 more
wiley +1 more source