简介:甲:我看你很高兴的样子,肯定考得很好吧?乙:不是考得好,是抄得好,整张考卷基本上抄完了。(三天后)甲:你怎么蔫了?乙:还不是因为考试,原来老师发的是AB卷,瞎忙活了!
简介:Thisworkdealswiththekineticsofco-condensationpolymerizationofAB2andABmonomers,givingexpressionsofthetwo-dimensionalmolecularweightdistributionfunctionandthenumber/weightaveragemolecularweightsoftheresultingcopolymers.Thetwo-dimensionalmolecularweightdistributiondependsontwoindices,nandl,whicharetherespectivenumbersofAB2andABunitsinacopolymerspecies.Theevolutionofthetwo-dimensionalweightandzdistributionsduringtheco-condensationpolymerizationhasbeenevaluatedsystematically.Finally,thetwo-dimensionaldistributionwastransformedintoaone-dimensionalmolecularweightdistributionwithonlyonevariable(themolecularweightoftheproductsinsteadofthedegreeofpolymerization).Thecalculatedresultsshowthatthehighlybranchedcopolymerhasaverybroadmolecularweightdistributionwhentheco-condensationpolymerizationapproachescompletion.
简介:摘要目的探讨抗甲状腺球蛋白抗体(TG-Ab)、抗甲状腺过氧化物酶抗体(TPO-Ab)与临床习惯性流产的关系。方法选取100例有复发性流产史未孕妇女为研究组,另选100例有正常妊娠史、未孕健康妇女为对照组,采用化学发光免疫技术测定两组血清中TPO-Ab,TG-Ab,比较两组中抗体的阳性率。结果100例流产女性患者中抗甲状腺抗体(ATA)总阳性率为39%,与正常对照组抗甲状腺抗体(ATA)总阳性率14%相比差异显著。结论妇女习惯性流产可能与甲状腺抗体水平存在一定的关系,可作为习惯性流产病因的检测指标。
简介:Theeffectofthehot-chargingtreatmentontheperformanceofAB2andAB5hydrogenstoragealloyelectrodeswasinvestigated.Theresultshowedthatthetreatmentcanmarkedlyimprovethevoltageplateauratio(VPR),thehighratedischargeability(HRDA),thediffusioncoefficientofhydrogenDHandthedischargecapacityoftheAB2hydrogenstoragealloyelectrode.TheSEManalysisshowedthatthehot-chargingtreatmentbringsaboutaNi-richsurfaceduetothedissolutionofZroxides.ItisalsoveryhelpfulfortheimprovementofthekineticpropertiesofAB2hydrogenstoragealloyelectrodebecausethemicrocrackingo.fthesurfaceresultsinfreshsurface.ThiscanbethebasicmodificationtreatmentforNiMHbatteryusedinelectricvehicles(EVs)inthefuture.ButforAB5typealloys,thetreatmenthasthedisadvantageofimpairingthecomprehensiveelectrochemicalproperties,becausethesurfaceofthealloymaybecorrodedduringthetreatment.Themechanismofthesurfacemodificationoftheelectrodeisalsoproposed.