简介:【摘 要】 本文指出J18型(D-sub系列)小型矩形电连接器参照IEC60807及美军标MIL-C-24308等许多军用和工业用标准要求进行研制生产;连接器应用广泛,主要用于通讯设备、电子计算机及工业电子仪器等;产品有焊接式、压接式、压配式、直插印制板、弯插印制板等型式之基础知识介绍。
简介:用双J—硅架支架引流管为24例患者行输尿管膀耽内引流,经IVU证实肾积水改善,使用此方法的患者可早期下床活动,这有利于吻合口的愈合,而且并发症少,缩短了住院时间,其护理要点是及时插导管引流,保持双J—导管位置和防治泌尿系感染。
简介:ThispaperdealswithastudyonSnPbandlead-freesolderedjointreliabilityofPLCCdeviceswithdifferentleadcountsunderthreekindsoftemperaturecycleprofiles,whichisbasedonnon-linearfiniteelementmethod.Byanalyzingthestressofsolderedjoints,itisfoundthatthelargeststressisattheareabetweenthesolderedjointsandtheleads,andanalysisresultsindicatethatthevonMisesstressatthelocationslightlyincreaseswiththeincreaseofleadcounts.ForPLCCwith84leadsthesolderedjointswasmodeledforthreetypicalloading(273-398K,218-398Kand198-398K)inordertostudytheinfluenceofaccelerationfactorsonthereliabilityofsolderedjoints.Andtheestimationofequivalentplasticstrainofthreedifferentlead-freesolderalloys(Sn3.8Ag0.7Cu,Sn3.5AgandSn37Pb)wasalsocarriedout.