简介:摘要目的探讨皮下埋植避孕法的效果和应用价值。方法对我站2007年1月-2011年12月418例25-40岁已婚育龄妇女自愿接受皮下埋植避孕者定期随访,对使用者妊娠情况、副反应、及因副反应而取出的情况进行讨论和分析。结果妊娠0%、副反应56.45%、因副反应而取出10.28%。结论皮下埋植剂避孕是一种较好、安全的避孕方法,尤其适用不适合、不能够使用节育环(如生殖道畸形、剖腹产后子宫内膜连粘等)和使用节育环容易失败的妇女。
简介:Widegapbrazing(WGB)experimentsusingthebuttedspecimenwitha1.5mmgapwerecarriedoutfortherepairofthefailedK418Bsuperalloylow-pressureturbinevanes.Thehightemperaturecreeprupturestrengthsofthebrazedjointsweretested,andthemicrostructuresandfracturesurfacesofthejointswereobserved.TheresultsshowthatthemicrostructureofK418Balloyjointiscomposedofdenseequiaxedgrain,smallanddiscretecompoundswithafewmicro-pores.Duringthecreeprupturetest,thecracksinitiatepreferentiallyatthemicro-poreorthegrainboundary,thenpropagatealongthegrainboundarytillthefracturehappens.Thecreeprupturestrengthat700℃ofthebrazedjointswith50%brazemetalintheworkingpartcouldexceed90%thatoftheK418Bsuperalloy,andthejointswith100%brazemetalintheworkingpartachieve70%to80%ofthecreeprupturestrengthsfortheK418Bbasemetal.