简介:Therelationshipbetweenpetrographicalandphysicalpropertiesoflimestone,basalt,graniteandgneisswasinvestigated.Petrographicaldatawerequantifiedfrompolishedthinsectionswithapolarisingmicroscopetodeterminethemodalcomposition.ThepropertiesofresistancetofragmentationandabrasionweredeterminedbyLosAngelesabrasiontestandcrushingtest.TheshapecharacteristicwasmeasuredbyFlakinessindextest.Theexperimentalresultsindicatethatabundanceoffinetomedium-grainedminerals(especiallyofplagioclase,quartzandfeldspar)areprime,andstrongmicrographicintergrowthtexturewithinterlockinggrainboundarieshavethegreatpositiveinfluenceonthephysicalproperties.Itisalsoindicatedthatpetrographicalpropertiesandsurfacetextureofrockscandecidethepotentialityofrocksasrawmaterialswithhighqualityonresistingfragmentationandabrasion.AnalysisofIntegrationofpetrographicaldataandmechanicalpropertiesisidealfortheselectionofaggregatesusedinasphaltconcrete.
简介:Besidesthebiologicalgrowthfactors,smallorganicmolecules,andchemicalions,physicalsignalsistheothercategoryofveryimportantfactorstotune/regulatethefateofstemcells.Recentyears,moreattentionhasbeenpaidonthedifferentiationofstemcellsonthephysicalsignal,including,electricormagneticfield,surfacetopologyofbiomaterials,photoirradiation,andevenpressureandstrainfromthematerials.With
简介:PhysicalsimulationisusedtostudythemovementofnonmetallicparticlesinAlmeltinelectromagneticfield.ItisfoundthattheterminalvelocityofparticlesindifferentReynoldsnumberrangehasdifferentfunctions.ByconfirmingdragforcecoefficientofnonmetallicparticleswithReynoldsnumberintherangeof0.2~10and10~25respectively,twofunctionsofterminalvelocityforsphericalnonmetallicparticleshavebeengotaccordingly,whichprovideatheoreticalbasisforseparatingnonmetallicinclusionsfromAlmeltinelectromagneticfield.
简介:60%whitecorundumusedforaggregate,5%aluminiumpowderforfixedadditionsand35%variousadditivesformatrixwerepreparedforspecimens1#,2#,3#.Theyweremixeduniformlywiththesuitableresinasabinderandpressedunderpressureof315tonforgingpress,thendriedat200℃for24h.Effectsofvariousadditiveson1500℃×2hcreeppropertiesofAl3CONreinforcedcorundumcompositewereresearched.Theexperimenalresultsshowthatcreepcoeffi-cientsofspecimens1#,2#,3#at1500℃×2hare1.4×10-4,-9.4×10-4,-22.6×10-4,respectively.CrushingstrengthoftheslideplateaddedwithsuitableadditiveAafterfiredat1500℃×3hreachesto225MPa,thecreeprateispositiveallthetimefrom0%to0.014%at1500℃for2h.Themicro-structureresultanalysisshowsthatreinforcedphasesofAl3CONfibercompositehavebeenformedafterfiredwithAlpowderincokeathightemperaturesforspecimen1#,andthestrengthofthecompositeisincreased.Thehotmodulusofruptureisupto59MPaat1400℃andtheRULisobvi-ouslyhigherthanthatat1700℃.ItsservicelifeistwotimesasthatofAl2O3?Cslideplatewhenusedintheprocessofpouringsteel.Themechanismofcreeprateresistanceofthecompositescanbedis-coveredbymeansofSEMandEDAXanalysis.ItisconcludedthattheactiveAl3CONandAl2O3multiphasesthatwereformedbyN2ingas,C,AlandAl2O3insidethematrixofthecompositesduringin-situreaction,whichgivesthecompositesoutstandingcreeprateresistanceforthedensezonere-sultingfromAl3CONoxidationthatinhibitscontractionatthehightemperature.Besides,thematrixwillturnintothemultiphasewithhighrefractoriness,NcontentanditsAl3CONreinforcedfiberwillfurtherincreaseaccordingly.Inaddition,Al3CONformedbyAl2O3andC,AlinthematrixwithN2ingaswillinhibitthecreeprateandalsogreatlyimprovethecreeprateresistanceofthecomposites.
简介:设计象建筑学,孔,机械性质和表面性质那样的脚手架的骨头织物的性质在细胞的反应上有重要效果并且在骨头新生起一个重要作用。在这研究,threedimensionalnanocomposite脚手架由钙磷酸盐(帽子)组成nanoparticles并且poly(hydroxybutyrate-co-hydroxyvalerate)(PHBV)共聚物与控制了外部、内部的体系结构成功地经由选择激光sintering(SLS)被生产,万用的快速的原型技术之一。Ca-P/PHBVnanocomposite脚手架有一个孔(对类脂化合物peroxidation的61.75ct。他们的IC50价值是196和273牯敭吗?