简介:TheDCcharacteristicsofSiGeHBTirradiatedatdifferentelectrondosehavebeenstudiedinacomparisonwiththoseofSiBJT.Generally,IbandIb-Ib0increase,Ic,Ic-Ic0andits+/-transitionVbeaswellasDCcurrentgainβdecreaseswithincreasingdose;increaseofIb-Ib0withincreasingdoseforSiBJTismuchlargerthanthatforSiGeHBT;βincreaseswithVbeorIb,butdecreasesatIb<0.25mAwithIb,andcongregatesathigherdose;andadamagefactord(β)ismuchlessatthesamedoseforSiGeHBTthanforSiBJT.SiGeHBThasmuchbetteranti-radiationperformancethanSiBJT.SomeanomalousphenomenaforincreaseofIc,Ic-Ic0,Ib-Ib0andβatlowdosehavebeenfound.Someelectrontrapshavebeenmeasured.Themechanismofchangesofcharacteristicsisdiscussed.
简介:令人心悸的预备钟敲响了。李小刚再次看看表,忐忑不安地等待监考老师来发放试卷。其他几门会考科目都已顺利过关,最担心的就是这门历史。连自己生日都记不住的人哪能记什么秦皇汉武!更要命的是监考老师竟是出名的“母老虎”,自己苦心孤诣经营的联络网告吹不算,煞费苦心摘抄复印的袖珍“备忘录”也将无用武之地。会考不过关的话。还指望高考登堂入室吗?虽然自己父亲身为银行行长。但自己如果是“阿斗”的话,也捧不上手啊。李小刚越想越烦躁,头皮有点胀,禁不住抓耳挠腮起来。瞬时,考场里鸦雀无声。果然名不虚传,陈老师铁板着脸,威严地扫视全场。然后一字一顿地宣读考场纪律。一字一句就象扎在李小刚的心上。待到考卷发下来,李小刚头皮麻