Results 41 to 50 of about 1,244,409 (169)
Adaptive Chemical Strain Boundary in Freestanding BiSmFe2O6 Double‐Perovskite Membranes
Rare Metals, Volume 45, Issue 1, January 2026.ABSTRACT Double‐perovskite multiferroic systems have attracted increasing attention due to their highly tunable structures and chemical adaptability. The uncontrollable performance changes caused by the release of boundary conditions are an important factor hindering the development of freestanding membranes.
Jie Tu +14 more
wiley +1 more source
, 2000 在古代,"机"、"器"、"械"都有不同的含义,"机械"通常指各种机巧的装置,"机器"的主要含义是机械装置。"机器"在17世纪成了与machina对应的词,19世纪以后被广泛用作machine的译名。"机械"的含义在19世纪与machinery基本一致。20世纪初,"机械"成为各种机械装置的泛称,其含义包括"机器"
张柏春
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Gaoya dianqi, 2018 文中以一起220kV GIS隔离开关故障分析处理及其他同类设备的测试数据为基础,对该类型GIS隔离开关的机械特性进行深入研究,提出了GIS隔离开关装用的弹簧机构机械特性不稳定,应更换为电动机构;同时提出66kV及以上GIS隔离开关出厂机械特性测试及现场机械特性测试时,均应将测试仪的脉冲时间设置为120200 ms,确保测试仪与站内后台设置的分合闸脉冲时间保持一致,以便全面检查机构箱内电气接线的正确性。为检查测试GIS内隔离开关分合闸是否到位提供了一个行之有效的检测方法。
司维, 司洪孝
doaj
Gaoya dianqi, 2021 机械特性对高压断路器的开断性能具有重要的意义。文中以配弹簧操动机构的126 kV高压SF6断路器为研究对象,实验测量了分合闸弹簧的疲劳曲线,在分析弹簧疲劳机理的基础上,基于弹簧应力松弛过程的理论模型建立了预测弹簧疲劳的线性回归方程;建立高压断路器弹簧机构多体动力学模型,根据高压断路器实际工况进行动力学仿真,从而对高压断路器的机械特性进行计算分析;在此基础上分析了高压断路器投入使用不同年限情况下的分合闸行程、速度随时间的变化特性,揭示了高压断路器在不同疲劳情况下的特性劣化变化规律 ...
辛伟峰 +7 more
doaj
Ultrasound in Obstetrics &Gynecology, Volume 66, Issue 6, Page 706-715, December 2025.ABSTRACT Objective To evaluate the use of twin vs singleton growth charts for detecting small‐for‐gestational‐age (SGA) twins at risk of adverse neonatal outcomes. Methods MEDLINE, EMBASE, CINAHL, Cochrane and Scopus databases were searched electronically from inception to May 2024.
S. Sorrenti +9 more
wiley +1 more source
Auto-focus technology and its application based on image processing
, 2009 Auto-focusing technique is an important method to improve the precision,intelligentization,automatization for the indentation diameter measurement.The paper introduces an auto-focus method of indentation diameter measurement based on image processing ...
Chen, Xiaomei, Yang, Tao, Zuo, Yong
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Gaoya dianqi, 2015 针对高压断路器机械振动信号,在正常状态、分闸弹簧单根脱落状态和操作及传动机构卡涩状态下,采用模糊C聚类分析算法比较短时傅里叶变换、小波包能量熵和希尔伯特—黄变换3种特征提取方法的分类性能,提出了基于相关向量机理论的断路器机械特性故障诊断方法,搭建了数据采集系统,研究了断路器机械特性不同状态下信号特征值的变化规律,并通过实验证明了特征提取和故障诊断方法的有效性。
李斌, 李爽, 鲁旭臣
doaj
Rare Metals, Volume 44, Issue 11, Page 8161-8197, November 2025.Graphical abstract AbstractThe studies on the synthesis of two‐dimensional (2D) Janus materials have made significant progress over the years. They offer new opportunities to increase the potential usage of Janus transition metal dichalcogenide (TMDC) materials in different application areas due to their unique structural, electrical, optical and ...
Ayça Coşkun +9 more
wiley +1 more source
, 2002 仿人机器人腰部的构成对仿人机器人的运动学、动力学性能起着重要的作用。本文着重分析了目前仿人机器人腰部机构存在的问题,提出了一种具有柔性特征的仿人机器人腰部设计方案。本设计使仿人机器人具有良好的柔顺性,提高了机器人与人协作时的安全性 ...
赵铁军, 赵明扬
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