Results 21 to 30 of about 12,978 (169)
Objective assessment of communication speech interference effect based on feature fusion [PDF]
, 2023 In view of the objective assessment problem of the effect of communication speech interference, methods based on multi-measurements and multimodal fusion were proposed.First, the interfered speech was preprocessed by the endpoint detection algorithm and ...
Huaitao XU +4 more
core +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photocatalytic molecular oxygen (O2) activation provides a sustainable approach to produce singlet oxygen (1O2) for organic contaminants detoxification. However, the charge carriers‐involved pathway usually suffers from unsatisfactory 1O2 production efficiency owing to energy loss caused by photogenerated hole‐mediated superoxide species (•O2−
Yan‐Biao Shi +8 more
wiley +1 more source
Study on properties of armature current for micro DC motors and multiple features of fault diagnosis [PDF]
, 2015 针对直流微电机生产线上故障检测环节难以自动化的问题,提出一种基于故障多特征量的直流微电机故障诊断模型。通过分析空载和稳态下直流微电机的动态数学模型,推导出电枢电流的时域解析式,确定基于电枢电流的频域故障多特征量。以数台直流微电机为实验样本,分析其电枢电流时频域特征,对典型故障直流微电机运用定义的故障多特征量进行故障分析。实验结果表明不同故障电机的多特征量变化率明显不同,该故障多特征量可以被用来诊断直流微电机。A fault diagnostic model for the micro direct ...
伍卫, 洪剑锋, 谢志平
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT Photodetectors, based on GaAs nanowires (NWs), hold significant promise in the fields of high integration micro‐ and nano‐optoelectronics applications because of their outstanding electronic and optical properties. To date, significant efforts have been directed toward enhancing the performance of photodetectors, aiming for high detectivity ...
Yu Hao +11 more
wiley +1 more source
Gaoya dianqi, 2019 短路电流直流分量含量对断路器开断能力有很大影响,然而对直流分量的计算至今缺乏简单实用的方法。分析短路电流直流分量产生原理及其衰减特性,结合电力网络数学模型的特点,提出了基于转移阻抗理论的短路电流直流分量实用计算方法:将电力系统复杂网络近似简化为以短路点为中心的辐射形网络,求出各发电机所提供短路电流直流分量及其衰减情况,最终对所有分支短路电流直流分量求和近似计算出故障点短路电流直流分量。通过实用计算方案与EMTP仿真计算以及故障录波的对比分析,验证了该方法的准确性。
张旭航 +5 more
doaj
Carrier-current Transceiver Systems Consisted of LM1893 Carrier-current Transceiver IC [PDF]
, 2000 电力线载波通信系统利用电力线来实现远程数据传送 .L M1893是一种可完成串行数据半双工通信 ,具有发送和接收数据的全部功能的载波通信芯片 .数据发送时 ,经过 FSK调制之后的正弦载波信号可适合现有的各种电力线路 ;数据接收时 ,差分锁相环电路和三级噪声滤波电路保证了接收数据的精度 .一个完整的载波通信系统只需 L M1893、一个控制单元和一些外部元件便可构成 .Carrier current systems use the power line mains to transfer ...
李烈刚
core
Rare Metals, Volume 45, Issue 2, February 2026.ABSTRACT With the continuous advancement of materials science and technology, the rare metal gallium has increasingly emerged as a promising alternative to the toxic metal mercury. Although existing research has predominantly focused on the high electrical conductivity and excellent deformability of liquid metal (LM), its intrinsic fluidic property ...
Feifan Guo +6 more
wiley +1 more source
Gaoya dianqi, 2017 容量试验中短路电流直流分量的大小直接影响电流过零点的di/dt与TRV,对直流分量的精确控制直接关系到试验质量与效率。容量实验室通常控制3台独立的合闸开关分别进行选相合闸以产生满足要求的直流分量。文中运用理论分析方法找出了产生完全对称短路电流和最大非对称短路电流的选相方法,并对一种含有Y/△变压器的回路进行了分析,总结了根据电流波形判断合闸开关关合顺序的方法。
张晋波 +4 more
doaj
基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法研究 [PDF]
全球能源互联网为实现更强的能量耗散能力，混合式高压直流断路器的耗能支路需串并联大量金属氧化物压敏电阻（metal oxide varistor，MOV），耗能支路的可靠性将直接影响混合式高压直流断路器的可靠性。但是，现有的耗能支路故障检测方法并不能适应整个能量耗散阶段。为此，提出一种基于经验傅里叶分解的混合式高压直流断路器耗能支路故障检测方法，具体为：首先是信号预处理，对耗能支路每个子模块的分支电流进行归一化和一阶差分计算来获取分析电流；然后是故障特征提取，利用经验傅里叶分解（empirical Fourier ...
彭兆伟 +5 more
doaj +1 more source
Rare Metals, Volume 45, Issue 2, February 2026.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