- 德維奇
下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯
devics中文什么意思
例句與用法
- At the initial stage of planar technique , b was employed as ideal diffusion impurity in base - region of npn si planar devices because of the match of its solid - solubility and diffusion coefficient in si with those of p in emission - region , and the good shield effect of sio2 film to b . but because of the relatively large solubility ( 5 1020 / cm3 at 1000 ) and the small diffusion coefficient , the linear slowly - changed distribution of acceptor b in pn junction can not be formed , which could not cater to the requirement of high - reversal - voltage devics . thereafter b - a1 paste - layer diffusion technology and close - tube ga - diffusion technology had been developed , while the former can lead to relatively large the base - region deviation and abruptly varied region in si , which caused severe decentralization of current amplification parameter , bad thermal stability and high tr ; the latter needed the relatively difficult pack technique , with poor repeatability , high rejection ratio , and poor diffusion quality and productio n efficiency
在平面工藝初期，由于b在硅中的固溶度、擴(kuò)散系數(shù)與n型發(fā)射區(qū)的磷相匹配， sio _ 2對(duì)其又有良好的掩蔽作用，早被選為npn硅平面器件的理想基區(qū)擴(kuò)散源，但b在硅中的固溶度大( 1000時(shí)達(dá)到5 10 ~ ( 20 ) ，擴(kuò)散系數(shù)小， b在硅中的雜質(zhì)分布不易形成pn結(jié)中雜質(zhì)的線(xiàn)性緩變分布，導(dǎo)致器件不能滿(mǎn)足高反壓的要求，隨之又出現(xiàn)了硼鋁涂層擴(kuò)散工藝和閉管擴(kuò)鎵工藝，前者會(huì)引起較大的基區(qū)偏差，雜質(zhì)在硅內(nèi)存在突變區(qū)域，導(dǎo)致放大系數(shù)分散嚴(yán)重，下降時(shí)間t _ f值較高，熱穩(wěn)定性差；后者需要難度較大的真空封管技術(shù)，工藝重復(fù)性差，報(bào)廢率高，在擴(kuò)散質(zhì)量、生產(chǎn)效率諸方面均不能令人滿(mǎn)意。
百科釋義
Devics is an indie rock band from Los Angeles, California consisting of Sara Lov, Dustin O'Halloran, Ed Maxwell, Theodore Liscinski, and Evan Schnabel. Their music can be described as melancholic.
詳細(xì)百科解釋