简介:截至10月,超过4000美国人正在等待接受心脏移植。随着心脏的衰竭,这些患者没有其他选择;心脏组织,不像其他身体部位,一旦被损坏是无法自身治愈的。幸运的是,卡内基·梅隆大学一个团队最近的研究,可能有一天将不再需要移植来修复受损的器官。"我们已经能够获得冠状动脉的MRI图像和胚胎心脏的3D图像,并且利用非常柔软的材料,如胶原蛋白、藻酸盐和纤维3D生物打印他们,使其具有前所未有的分辨率和质量,"卡内基·梅隆大学材料科学与工程和生物医学工程副教授AdamFeinberg说。"正如Feinberg教授在生物印刷工作中出色展示的那样,我们CMU的
简介:Thecorrosionofrefractoriesresultsfromreactivetransport,namely,transportofagentsandchemicalreactionsoftheseagentswithimpregnatedmedium.Ononehand,thetransportinvolveseitherdiffusionorimpregnationdependingonthestateofthecorrosiveagentsandthemicrostructureofthehostmedia.Ontheotherhand,chemicalreactionsmaybeverynumerousandcomplex.ThisstudyfocusedonthereactiveimpregnationofAl2O3-CaOslagintoporoushighaluminarefractory.Thetransportpropertiesoftherefractorymaterialwereidentifiedbymeansofadedicatedcapillaryrisingtest.ChemicalreactionsbetweenthesolidhighaluminaskeletonandAl2O3-CaOslaginvolvesuccessivedissolution/precipitationmechanismsformingaluminatesoflime.Contrarytothethermodynamicpropertiesofthebinarysystem,thekineticsofthesesolid/liquidreactionsisnotwellknown.Corrosiontestsassociatedwiththequenchingmethod,XRDanalyseswereperformedforabetterunderstandingofthekinetics.Theresultsofthisstudyopenupacouplingapproachforpredictingthecorrosionwearofrefractory.