简介：改进a-tricalcium磷酸盐(伪-TCP)的成骨能力骨头水泥，新奇BMP/伪-TCP合成骨头水泥被准备。由测量设定的时间和压缩力量，骨头水泥的水和特征被评估。包括组织学的观察，X光线照相术的调查以及数字图象分析的动物实验在BMP，a-TCP骨头水泥和BMP/之中揭示成骨能力的差别伪-TCP合成骨头水泥。结果证明伪-TCP骨头水泥拥有优秀水和和背景性质以及高机械的性质。比较实验证明BMP/伪-TCP合成骨头水泥有一个更强壮的成骨能力。implant地点的粗野观察不展出任何发炎或坏死。组织学的分析表明材料与主人骨头，和新骨头形成有好osteointegration在材料以内被检测，它正在降级。强壮的成骨能力合成由于不仅优秀osteoconductive潜力而且活跃BMP释放和材料降级贡献的osteoinductive潜力。大颅骨缺点能由充满BMP/伪-TCP合成骨头水泥是愈合得好的。这新奇材料证明自己是一可吸收并且有一个成骨能力的bioactive骨头水泥。关键词伪-tricalcium磷酸盐(伪-TCP)-骨头形态基因的蛋白质(BMP)-骨头水泥-成骨-osteoinductivity-骨头织物工程为中国(2002123)的教育部的突出的年轻教师由863高技术研究和中国(2002AA326080)和资金的发展节目资助了

简介：Asetofcouplingexperimentalinstrumentwasdesignedtostudythetransportpropertiesofchlorideioninconcreteundersimultaneouscouplingactionoffatigueloadandenvironmentalfactors.Firstlythewater-saturatedperformanceofmodernconcretewasinvestigated,thendiffusionperformanceofchlorideionunderdifferentstresslevelsanddifferenttemperaturewerestudiedrespectively;meanwhile,thetime-dependentbehaviorofthechlorideiondiffusioninconcretewasalsoresearched.Theresultsshowedthatthesaturationdegreeofconcretecanreachashighas99%.Besides,diffusioncoefficientofchlorideionincreasedwithincreasingofthestresslevelandtemperature,andwhenthestresslevelandtemperatureareat0.6and60℃respectively,thediffusioncoefficientis6.3×10-14m2/s,moreoverthediffusioncoefficientofchlorideioninconcretedecreasedwithtimeunderthesimultaneouscouplingactionoffatigueloadandenvironmentfactors.

简介：Theeffectofcathodichydrogenchargingonthetensileandconstantloadpropertieswasdeterminedforanausteniticstainlesssteelweldmentcomprisinga304Lsteelinthesolutiontreatedconditionasabasemetalanda308Lfillersteelasaweldmetal.Partofthe304Lsolutiontreatedsteelwasseparatelygivenadditionalsensitizationtreatmenttosimulatethemicrostructurethatwoulddevelopintheheataffectedzone.Testswereperformedatroomtemperatureonnotchedroundbarspecimens.Hydrogenchargingresultedinapronouncedembrittlementofthetestedmaterials.Thiswasmanifestedmainlyasaconsiderablelossinthedluctilityoftensilespecimensandadecreaseinthetimetofailureandthresholdstressofconstantloadspecimens.The308Lweldmetalexhibitedthehighest,andthe304Lsolutiontreatedsteelthelowest,resistancetohydrogenembrittlement.Hydrogenembrittlementwasassociatedwiththeformationofstraininducedmartensiteaswellasatransitionfrombrittletoductilefracturemorphologyonwardsthecentreofthespecimens.

简介：ThebearingcapacityofFRPconfinedconcrete-filledsteeltubular(FRP-CFST)columnsunderaxialcompressionwasinvestigated.Thisnewtypeofcompositecolumnisacon-crete-filledsteeltube(CFST)confinedwithfiber-reinforcedpolymer(FRP)wraps.Totally11shortcolumnspecimensweretestedtofailureunderaxialcompression.TheinfluencesofthetypeandquantityofFRP,thethicknessofsteeltubeandtheconcretestrengthwerestudied.ItwasfoundthatthebearingcapacityofshortFRP-CFSTcolumnwasmuchhigherthanthatofcomparableCFSTcolumn.Furthermore,theformulasforcalculatingthebearingcapacityoftheFRP-CFSTcolumnsareproposed.Theanalyticalcalculatedresultsagreewellwiththeexperimentalresults.

简介：Alloying和水花免职技术被采用改善合金ZA27的服务温度限制以与高抑制能力和好提高的温度开发新功能的材料机械性质。抑制行为和合金ZA27的提高的温度creep抵抗上的Si的5wt%的增加的效果被调查。抑制能力，以及相对动态模量，在303～573K上在1.4Hz的频率被测量。没有山峰现象为在兴趣的温度范围测试的标本被观察。试验性的结果显示扔的材料的抑制能力比在305K的扔的那个的高2.8倍。球坚硬价值被用来评估creep性质，扔的材料的creep活化能比当演员组那的高每摩尔是3.9-5.7kJ。creep率明确的表达也被导出。最后，起作用的抑制和creep机制根据从它微观结构的描述获得的数据被讨论，抑制能力和creep抵抗。(编辑作者摘要)12个裁判员。

简介：QingdaoJiaozhouBaysubseatunnelisthesecondself-builttunnelinChinawiththedesignedservicelifeover100years.Thedurabilityofliningconcreteareoneofanimportantfactorstodeterminatetheservicelifeoftunnel.Consideringthemainenvironmentalloadsandmechanicalloadsofsubseatunnel,thedurabilitypropertiesofliningconcreteundercombinedactionofcompressiveloadandcarbonationhasbeenstudiedthroughthecriticalcompressiveloadtest,acceleratedcarbonationtest,naturalcarbonationtestandcapillarysuctiontest.Thetestsresultsshowthatcriticalcompressiveloadapparentlyacceleratesthecarbonationanddeterioratestheanti-permeabilityofconcrete.Underthecombinedactionofcriticalcompressiveloadandcarbonation,thedurabilityofliningconcretedecreases.Basedonthecarbonizationlifecriteriaandresearchresults,forthehigh-performanceconcretewithproposedmixratio,thepredictedservicelifeofliningconcreteforJiaozhoubaysubseatunnelisabout80yearswhichfailstoreachtherequiredservicelife.Itisnecessarytoadoptothermeasurementssimultaneouslytoimprovethedurabilityofliningconcrete.

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简介：Theeffectofthermalcyclingunderloadingonmartensitictransformationandtwo-wayshapememoryeffectwasinvestigatedforTi-49.8at.pctNialloy.ItisshownthatMsandMftemperatureincreasewithincreasingthenumberofcycles,whileAsandAftemperaturedecreaseduringthermalcycling.Thetotalstrainεtandpermanentstrainεpincreasewithincreasingappliedstressandnumberofcycles.Thetwo-wayshapememoryeffectcanbeimprovedbyproperthermalcyclingtrainingunderloading,whileexcessivelyhighappliedstressresultsinthedeteriorationofTWSME.Thereasonforthechangesinmartensitictransformationcharacteristicsandtwo-wayshapememoryeffectduringthermalcyclingunderloadingisdiscussedbasedontheanalysisofmicrostructurebyTEMobservations.

简介：ConstantloadtestsinNS4solutionpurgedwithN2-5%CO2gasmixturewereconductedonAmericanPetroleumInstitute(API)X80pipelinesteelappliedinthe2ndWest-EastGasPipelineprojectwithandwithoutpreload.TheresultsshowthatcrackscouldinitiateandpropagateinX80pipelinesteelinnear-neutralpHenvironmentunderaconstantloadcondition.Thelifeofcrackinitiationandpropagationincreasedwithdecreasingappliedstress.Preloaddidnotchangeitscorrosionbehaviorobviously.However,preloadreducedthetimeforcrackinitiation.

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