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:Anultrahighvacuumchemicalvapordeposition(UHV/CVD)systemisintroduced.SiGealloysandSiGe/Simultiplequantumwells(MQWs)havebeengrownbycold-wallUHV/CVDusingdisilane(Si2H6)andgermane(GeH4)asthereactantgasesonSi(100)substrates.ThegrowthrateandGecontentsinSiGealloysarestudiedatdifferenttemperatureanddifferentgasflow.ThegrowthrateofSiGealloyisdecreasedwiththeincreaseofGeH4flowathightemperature.X-raydiffractionmeasurementshowsthatSiGe/SiMQWshavegoodcrystallinity,sharpinterfaceanduniformity.Nodislocationisfoundintheobservationoftransmissionelectronmicroscopy(TEM)ofSiGe/SiMQWs.TheaveragedeviationofthethicknessandthefractionofGeinsingleSiGealloysampleare3.31%and2.01%,respectively.
简介:目的:研究血清中TIgE、SIgE在非侵袭性真菌性鼻窦炎的2个亚型(真菌球型和变态反应型)中的表达及临床意义。方法:回顾性分析非侵袭性真菌性鼻窦炎患者23例,用Unicap法检测患者血清中TIgE及SlgE的表达水平,x^2检验及Fishers精确概率计算法对血清中TIgE、SlgE的表达水平与各亚型之间的关系进行分析。结果:血清TIgE阳性10例(43%),SIgE阳性7例(30%)。14例真菌球型中,血清TlgE阳性2例(14%),SlgE阳性1例(7%):9例变态反应型中,血清TIgE阳性8例(89%),SIgE阳性6例(67%)。血清TIgE和SIgE在非侵袭性真菌性鼻窦炎的2个亚型之间的表达水平不同,差异有统计学意义(P〈005)。结论:变态反应型真菌性鼻窦炎中血清TIgE和SIgE的表达明显高于真菌球型,
简介:韩国开发成功“高性能热感知传感器”;法国KERMEL公司推出HEROSKIN新式面料;山东发明四种轻便实用新型消防器材。
简介:0 前言随着社会的飞速发展,人民生活水平的日益提高,食品的品种、品质、风味、口感、营养成分等日益被消费者所关注。为满足人们的生活需求,近年来食品冷加工技术飞速发展,大大丰富了老百姓的“菜篮子”。随之,食品冷藏链中解冻这一环节也受到部分企业,特别是冻品深加工企业的重视。解冻,是冻结的逆过程,是将冻结中形成的冰晶融化成水。在传统的解冻方法中,如空气解冻(静止空气、流动空气、加湿空气、加压空气等)、清水解冻(静止水、流动水、喷淋水)、真空低温解冻、溶液浸渍解冻(盐水溶液、乙二醇等)等,冻品均处在温度比它高的介质中,介质能量传递给食品,表层的冰首先融化,之后逐步向中