我国目前对噪音污染的治理方法主要有两种：一种是将水泥路 面的改柏油路面第二种是在距离住宅窗户较近的道路两侧安装隔音 屏障。但效果均不理想。路面改变只可降低汽车行驶摩擦声的3～5 分贝左右。至于安装隔音屏障．由于声波的衍射特性，声音的传播可 以跨越隔音屏障，在中频，高频声波传播中，遇到难以穿透的障碍物 时，背面就有一个声波微弱的影区。所以此举只对相近楼层有所缓 解，对更高楼层的住户而言，效果并不明显-Our current treatment methods for noi

This paper proposes a fast-response sliding-mode controller for controlling boost-type converters requiring a fast dynamical response over a wide range of operating conditions. The various aspects of the controller, which include the method o

This study is an attempt to investigate the effect of distributed Bragg reflectors (DBRs) doping concentration on the GaN-based vertical cavity surface emitting lasers (VCSEL) using Integrated System Engineering Technical Computer Aided Desig

IRF4905电压, Vds 最大:55V 开态电阻, Rds(on):0.02ohm 电压 @ Rds测量:-10V 电压, Vgs 最高:-4V 封装类型:TO-262 针脚数:3 频率, Pd:200W 封装类型:TO-262 封装类型, 替代:TO-262AB 晶体管类型:MOSFET 电压 Vgs @ Rds on 测量:10V 电压, Vds:55V 电压, Vds 典型值:55V 电流, Id 连续:74