简介:Carbonnanotubescancarryproteinintocellstoinducebiologicaleffects.Amino-functionalizedcarbonnanotubesaresolubleandbiocompatible,havehighreactivityandlowtoxicity,andcanhelppromotenervecellgrowth.Inthisstudy,amino-functionalizedethylenediamine-treatedmulti-walledcarbonnanotubeswereusedtopreparecarbonnanotubes-nervegrowthfactorcomplexesbynon-covalentgrafting.Thephysicochemicalproperties,cytotoxicitytoPC12andchickembryodorsalrootganglion,andbiologicalactivityofthecarbonnanotubes-nervegrowthfactorcomplexeswereinvestigated.Theresultsshowedthataminofunctionalizationimprovedcarbonnanotubes-nervegrowthfactorcomplexdispersibility,reducedtheirtoxicitytoPC12cells,andpromotedPC12celldifferentiationandchickembryodorsalrootganglion.
简介:Inthispaperthepropagationandbreakingofthesolitarywave,thesinusoidalwaveandthesecondStokeswaveonaslopeof1/30arediscussedbasedupontheTUMMACmethod,andthevelocityfieldsofbreakingwavesontheslopeareobtainedbyusingthetracingmethod.The.numericalresultsforwavedeformationareingoodagreementwithexperimentaldata,andthebreakerindexesdependingonthekineticcriterionagreeapproximatelywithprevi-ousresults.Furthermore,comparedwiththeexperimentalresultsmeasuredbyIwagakiandbytheauthors,thetendencyofvelocitydistributionofbreakingwavescomputedbythisnumericalmethodisalsosatisfactory.
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简介:Hygienesupervisionandcontroloverthemanufacturingplantssupplyingflightfood,thecabinservicedepartmentofAirChinaandfoodsupplyonaircrafthavebeenimplementedbytheBeijingAirportHealthandQuarantineBureau.Fifty—threespecificproblemsofvariouskindshavebeendetectedina12monthexperimentalperiodfromAugustof1991toAugustof1992.Thispaperhasdiscussedthelegalbasis,supervisionunit,workproceduresandworkcontentofsupervisionandcontroloveraircatering.
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简介:Introduction.Poly(N-vinylcarbazole)(PVCZ)hasreceivedmuchattentionasarepresentativephotoconductivepolymerandextensivestudiesonmechanical,physical,chemicalandelectricalpropertieshavebeenreported'’.Ingeneral,thePVCZobtainedbyradicalandordinarycanonpolym...
简介:Theproblemofananti-planeGriffithcrackmovingalongtheinterfaceofdissimilarpiezoelectricmaterialsissolvedbyusingtheintegraltransformtechnique.Itisshownfromtheresultthattheintensityfactorsofanti-planestressandelectricdisplacementaroundthecracktiparedepen-dentonthespeedoftheGriffithcrackaswellasthematerialcoefficients.Whenthetwopiezoelectricmaterialsareidentical,thepresentresultwillbereducedtotheresultfortheproblemofananti-planemovingGriffithcrackinhomogeneouspiezoelectricmaterials.
简介:Aprobabilistieprogressivefailureanalyzingmethodisappliedtoestimatingthereliabilityofasimplysupportedlaminatedeompositeplatewithaninitialimperfectionunderbi-axialeompressionload.Theinitialimperfectionandthestrengthparametersareconsideredasrandomvariables.Ply-levelfailureproba-bilityisevaluatedbythefirstorderreliabilitymethod(FORM)togetherwiththeTsai-WustrengtheriterionandTancriterion.Currentstressesinthelaminatedstructurearecalculatedbytheclassicallaminationtheorywiththestiffnessmodifiedbasedonthelaststepplyfailure.Probabilistieallydominantply-levelfailurese-quencesleadingtooverallsystemfailureareidentified,basedonwhichthesystemfailureprobabilityisesti-mated.Anumeriealexampleispresentedtodemonstratethemethodologyproposed.Throughparameterstud-iesitisshownthatthedeviationoftheinitialimperfeetionandsomeofthestrengthparameterslargelyinflu-encethesystemreliability.
简介:Thepaperproposesacooperativedistributedtargettrackingalgorithminmobilewirelesssensornetworks.Therearetwomaincomponentsinthealgorithm:distributedsensor-targetassignmentandsensormotioncontrol.Inthekeyideaofthesensor-targetassignment,sensorsareconsideredasautonomousagentsandthedefinedobjectivefunctionofeachsensorconcentratesontwofundamentalfactors:thetrackingaccuracyandthetrackingcost.Comparedwiththecentralizedalgorithmandthenoncooperativedistrib...
简介:Thetoolsystemoftheorganizationalriskanalyzer(ORA)tostudythenetworkofEastTurkistanterroristsisselected.Themodeloftherelationshipsamongitspersonnel,knowledge,resourcesandtaskentitiesisrepresentedbythemeta-matrixinORA,withwhichtoanalyzetherisksandvulnerabilitiesoforganizationalstructurequantitatively,andobtainthelastvulnerabilitiesandrisksoftheorganization.Casestudyinthissystemshowsthatitshouldbeashortcuttodestroyeffectivelythenetwork...
简介:Thisresearchaimstoimprovetheforecastingprecisionofelectricquantity.ItisdiscoveredthatthetotalelectricityconsumptionconsiderablyincreasedduringtheSpringFestivalbytheanalysisoftheelectricquantitytimeseriesfrom2002to2007inShandongprovince.Thefestivalfactorisascertainedtobeoneoftheimportantseasonalfactorsaffectingtheelectricquantityfluctuations,andthemultiplicationmodelforforecastingisimprovedbyintroducingcorrespondingvariablesandparameters...