Results 91 to 100 of about 12,988 (195)

Excellent Comprehensive Electromechanical Properties in PZT‐Based Hard High‐Temperature Piezoceramics

open access: yesRare 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

曲柄摇杆机构的寻优方法

open access: yesJixie chuandong, 1997
提出了曲柄摇杆机构设计的寻优问题,针对已知K、φ、c的条件,通过统计规律及0.618法给出了寻优设计的方法,为优化设计曲柄摇杆机构提供了条件。
杨秀杰
doaj  

Non‐Precious Metals Enhance Hydrogen Evolution in COF/Cd0.9Cu0.1S S‐Scheme Heterojunctions: KPFM Reveals Charge Transfer Pathways

open access: yesRare 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

基于节能与减噪的电力变压器多目标优化设计

open access: yesGaoya dianqi, 2013
笔者针对当前迫切需要解决的电力变压器的节能与减噪问题,提出了一种既能使变压器节能,同时又兼顾减噪的多目标优化设计。在对电力变压器的节能和减噪理论进行分析的基础上,研究了电力变压器的节能、减噪设计的优化方案,分析了该方案节能与减噪的效益;然后,在此基础上又研究提出了一种同时兼顾节能与减噪并考虑总成本的新型多目标优化设计综合方案,并以SZ10-40000/110有载调压主电力变压器为例进行了实例优化与讨论,验证了该优化设计的有效性与先进性。
蒋雪峰, 黄文新
doaj  

A Bank SZ Branch planning and financial department performance management system to improve research [PDF]

open access: yes, 2017
经济全球化进程的不断推进,银行业之间的竞争越来越激烈。想要在竞争中要取得一席之地,银行首先需要重视人力资源开发和运用,加强人才竞争和人才管理,从而提高银行绩效的管理水平。因此,银行需要找到相适应的绩效管理理论,通过实际和理论的最佳结合方式,制定适合的绩效管理策划方案。在金融业发展方面,由于我国经济的持续高速增长和城市化建设步伐加快,经济市场需求一直旺盛,大多数银行在经济的刺激和资金效益的双层压力下,习惯于走快速扩张经营的道路。但是近年来,随着新资本协议的出台、利率市场化改革的持续推进 ...
薛舒婷
core  

Regulating TGO Nucleation and Growth of MCrAlX Coatings via Femtosecond Laser Remelting: The Role of Reactive Elements in the Oxidation Resistance

open access: yesRare 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

变压器分接开关内酚醛压板的神经网络全局优化设计

open access: yesGaoya dianqi, 2011
为改善变压器分接开关电场环境,笔者重点研究了变压器分接开关内酚醛压板的电场分布,利用有限元法计算了这种绝缘结构的电场,提出了结构设计的神经网络最优化方法。在神经网络最优化方式中,构建酚醛压板绝缘结构参数——电场分布的多输入—多约束输出神经网络模型,利用最优化方法构建优化算法,真正实现了酚醛压板绝缘结构的全局优化设计。结果表明,该方法对于研究多输入—多约束输出模型的全局优化设计具有普遍的指导意义。
蒋战朋, 文远芳, 范小辉
doaj  

Optical properties of ZnO-based type-II core/shell nanowire arrays [PDF]

open access: yes, 2016
II型同轴纳米线由于其独特的光学和电学特性,在光伏器件领域获得广泛关注。其中,ZnO纳米线由于其成本低、稳定性好、工艺成熟等优点,更是被广泛运用于太阳能电池研究。然而,由于它的带隙较宽,不能有效吸收太阳光,直接用它制备的电池效率较低。为了增加光吸收,人们主要利用带隙较窄的ZnSe、CdSe、ZnCdSe等材料敏化ZnO纳米线,以期制备出更高效的太阳能能电池。本文采用计算机仿真模拟方法,利用FDTDSolutions和ModeSolutions软件研究了ZnO基II型同轴纳米线阵列的光学性质。通过对ZnO/
郑晅丽
core  

Climate stability drives multidimensional nestedness of amphibian assemblages in a Chinese sky island system

open access: yesFunctional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang   +5 more
wiley   +1 more source

具有模糊可靠度约束的装载机差速器的模糊优化设计

open access: yesJixie chuandong, 2003
在充分考虑了装载机差速器各种设计参数模糊性和随机性的基础上 ,结合传统的优化设计方法 ,探讨了具有模糊可靠度约束的装载机差速器的模糊优化设计的方法。
彭如恕, 林国湘
doaj  

Home - About - Disclaimer - Privacy