Results 31 to 40 of about 12,056 (169)
Fermi Surface Structure Revealed by Quantum Oscillations in Half‐Heusler Semimetal LuAuSn
Rare Metals, EarlyView.ABSTRACT The Fermi surface structure in the half‐Heusler semimetallic compound LuAuSn was systematically investigated using quantum oscillation studies of high‐quality single crystals and first‐principles calculations. Clear bulk quantum oscillation signals were observed for multiple complementary physical properties, including magnetization, Hall ...
Yue Lu +12 more
wiley +1 more source
Dianci bileiqi, 2013 氧化锌是生产电阻片的主要原材料,氧化锌的理化性能对电阻片的质量起着至关重要的作用。通过对氧化锌的理化性能:主含量、杂质含量（钾、钠、铁、镉、铅）、粒度、晶型结构、水分、盐酸不溶物及金属锌含量进行测试分析。根据多年测试经验,对氧化锌测试方法及关键技术条件要求进行了可行性改进,并结合生产实际使用情况,跟踪分析电阻片质量状况,判断氧化锌理化性能要求对电阻片电性能的影响。研究表明,氧化锌中铁、金属锌及钠等杂质含量过多能使电阻片的漏流增大,铅杂质含量过多能使电阻片的方波性能下降,铜 ...
徐东, 李越, 李可菼, 王兰义
doaj
Design and Implementation of Power Quality Analyzing System [PDF]
, 2009 随着科学技术和国民经济的快速发展，各种工业生产对电力系统电能质量的要求越来越高。然而，现代电力电子设备和非线性负载的大量使用又造成电能污染日趋严重，电能质量成为电力部门及其用户日益关注的问题。 本文首先分析了电能质量问题的产生和国内外关于电能质量分析软件的发展情况，以及有关电能质量的定义和术语的标准化问题。详细描述了我国关于电能质量的六项标准中指标的定义及相关限值：电压偏差、频率偏差、公网谐波、电压波动和闪变、三相电压不平衡及暂态过电压和瞬态过电压，并结合国标和受关注的暂态事件提出本系统使用到的指标 ...
陈明金
core
Rare Metals, EarlyView.ABSTRACT This study introduces novel nonequiatomic TiZrCoCrMoCux (x = 0, 5, 10; at%) medium‐entropy alloys (MEAx) tailored for orthopedic implants, synergistically combining the biocompatibility of Ti‐based alloys, the wear resistance of CoCrMo alloys, and the antibacterial/osteogenic attributes of Cu. The alloy's microstructure, mechanical properties,
Hang Yu +9 more
wiley +1 more source
Gaoya dianqi, 2014 文章结合承担的国家科技支撑计划项目陈家镇智能社区项目,分析了智能微网系统电能质量环境特征,介绍了智能微网电能质量信息集成技术的总体实施方案,剖析了电能质量信息集成系统应考虑的主要环节及其各环节的主要功能,提出功能层整合、数据层整合、界面层整合是智能社区（微网）电能质量信息集成技术的关键。
时珊珊, 董瑞安
doaj
Design and Realization of Power Quality Analyzing System [PDF]
, 2009 为实现对电能质量实时监测与管理,提高电力企业信息化水平,综合国内外多种电能质量评估系统的性能,文中设计并研发了一种电能质量在线分析管理系统,实现了电能质量评估工作的系统化、实时化,提高电力企业信息化水平,并为电能质量的控制奠定了基础。该系统基于.nET平台构建开发,分为表示层、业务逻辑层及数据管理层对代码进行优化管理。采用AdO.nET技术,通过统一的数据库管理数据,实现了系统管理、电能质量在线分析及自定义生成报表等功能。该系统具有多指标分析的完善性、自定义生成报表的灵活性、使用方便、界面友好等特点 ...
牛媛媛, 陆达, 陈明金
core
Summary and Prospect of Comprehensive Evaluation Methods of Power Quality [PDF]
ObjectivesWith the continuous development of China's new power system, there is a growing integration of new energy sources such as photovoltaic and wind power into the grid.
DONG Guangde, XIAO Bai, ZHAO Xuechun
core +1 more source
Rare Metals, EarlyView.ABSTRACT Low conductivity, slow ion‐diffusion, and limited reactive sites are common problems in electrocatalysts and electrode materials. In this study, a complex NiTe–CoTe heterojunction with abundant Te vacancies embedded in N, P, and F co‐doped hollow carbon nanorods (NiTe1−x–CoTe1−x/NPFC) was fabricated via a simple ionic liquid‐assisted ...
Mingjie Yi +7 more
wiley +1 more source
The Research on the Power Quality Disturbances Based on the Wavelet Analysis [PDF]
, 2006 随着电力系统的迅速发展和电力电子技术在电力系统领域的广泛应用，电能质量问题已经成为各个领域关注的热点。对电能信号进行准确的检测与分析，实现暂态电能质量的故障定位、特征提取与分类识别，是对暂态电能质量进行监测和治理的必要前提和依据。本文首先针对IEEE所提出的各种电磁暂态现象，对四种常见的暂态电能质量现象，即电压骤降、电压骤升、电压中断和电压瞬时振荡作了详尽而细致的描述，并总结了近年来暂态电能质量研究的一些方法，然后对暂态电能质量的检测与分析做了以下几个方面研究。根据暂态电能质量信号的非平稳特性 ...
刘锐
core
Rare Metals, EarlyView.ABSTRACT Regulating negative parameters of metacomposites is mainly limited by their unclear mechanisms, which affects their practical applications in new sensing, communication, electromagnetic (EM) protection and other fields. This work proposes a dual‐functional competitive design strategy based on the waste corncob‐derived carbon/polyaniline ...
Qiuyun Yang +4 more
wiley +1 more source