简介:Itiswellknownthatvanadiumalloywillfacetostrongneutronirradiationandhydrogenenvironmentsasastructuralmaterialinafusionreactor.Someresearcheshavereportedthatvanadiumalloytookstronglyhardeningafteranexposuretohydrogenenvironmentandirradiationbyneutronatatemperaturelowerthan400℃.Theductilityofthealloywaslostlargely,evenentirelybrittlefractureoccurredsometimesintensionloadingofthealloy.Therefore,it'stogettheknowledgeofthehardeningmechanismandthefracturemechanicalforthepurposetoimprovetheperformancesofthealloyunderthecircumstances.
简介:Objective:Todetecttheexistenceofimmunetoleranceinducedbygamma-rayirradiation.Methods:Peritonealcellswereharvestedfrommicesubjectedto5Gy60Cogamma-raytotalbodyirradiationat3d,7d,15dand30d,thentheircounts,morphologicalchangesandIL-12geneexpressionwereinvestigated.Results:Afterirradiation,theperitonealcellsweresharplyreduced,thecellmorphologyshiftedfromround-liketopolymorphicandfusiformwithsomeprocesses,expressionofIL-12p35wasseriouslysuppressed,whilethatofIL-12p40greatlyenhanced.Conclusion:Ourdatahighlysuggestthatthegamma-rayirradiationcouldpotentiallyinducedendriticcell(DC)commitmentandimmunetolerance.
简介:Thedependencesofradiationinduceddefectsonirradiationtemperatureupto700℃at15dpaandonirradiationdoseupto85dpaatroomtemperaturehavebeeninves-tigatedbytheheavyionirradiationandthepositronannihilationlifetimespectroscopyfortheCLAM.Avoidsizepeakisobservedat~500℃wherethevacancyclustercontains9vacanciesandhasanaveragediameterof0.59nm.Thesizeofthevacancyclustersincreaseswiththeincreaseofirradiationdoseatroomtemperature,andthevacancyclusterat85dpaconsistsof9vacanciesandreachesasizeof0.60nmindiameter.TheabsolutevaluesofthevoidsizeatthepeakandtheincreaseofvoidsizewithdoseintheCLAMsteelarenegligiblecomparedtothoseofthenormalstainlesssteels,indicatingthattheCLAMsteelhasgoodradiationresistantproperty.
简介:Inthiswork,ultrasonicirradiationanddestabilizersolventwereusedfordestabilizingcolloidalplatinumdispersions.Thestabilizedplatinumnanoparticleswerepreparedinw/omicroemulsionsystemscomposedofsodiumbis-(2-ethylhexyl)sulfosuccinate(AOT)andfourdifferentsolvents,namely,cyclohexane,n-hexane,n-heptane,andn-nonane.TherecoveryprocessofPtnanoparticlesfromthecolloidalsystemswasperformedbyexposingthecolloidalsamplestoultrasonicirradiationandapplyingvariousdestabilizingsolvents.AnalysisofUV-visiblespectraconfirmsthatthequantityofPtnanoparticlesremovedfromthesuspensiondependsonthelengthoftimeoftheultrasonicirradiationandthenatureofthemicroemulsionoilphase.Acriticaltimefortheultrasonicirradiationhasbeenintroducedforthephaseseparationofcolloidalsystems.Toperformthesolventstudy,fourdestabilizersolvents,namely,dioxane,ethylacetate,diethylether,andtetrahydrofuran,wereusedforbreakingthecolloidalsuspensionofplatinumnanoparticles.Basedonthe’goodsolvent’and’poorsolvent’idea,itisverifiedthattheeffectofthedestabilizersolventsontheaggregationprocessfollowsthefollowingorder:tetrahydrofuran>ethylacetate>dioxane>diethylether.
简介:综合C-phycocyanins(CPC)做了硅石简历材料被SEM和赌注表面区域分析测量描绘。CPC的形态学做了硅石简历材料显示硅石簇的表面被很多硅石粒子与一种平均尺寸形成在30和40nm之间。硅石本身是有2.95nm的平均毛孔直径的多孔的结构。有他们的直径的毛孔为84.07%的不到5nm报道。另外,CPC能作为一根荧光灯的蛋白质探针被利用监视蛋白质封装的影响并且在硅石矩阵学习矩阵和蛋白质相互作用和蛋白质的稳定性。蛋白质封装硅石材料的申请要求简历分子在潜在地相反的工业条件上保留简历活动和稳定性。在答案或在硅酸盐矩阵的CPC在相片漂白由紫外光线罐头结果照耀,而在硅石的蛋白质少些被影响。在缓冲区答案的CPC的测量相片损坏率常数是比在硅石矩阵的CPC的快25倍的。然而,在硅石矩阵或磷酸盐缓冲区的CPC的一生是未受影响的。这些研究建议CPC的那个陷阱进硅石矩阵能不仅维持他们的生物活动而且显著地改进他们的相片稳定性。
简介:SincetheinventionofRubylaserbyMaimanin1960s,manykindsoflasersareusedwidelyindentistry.Ithasbeenprovedthatlaserirradiationcanproduceacidetchinglikesurface,thusstrengthenthebondofmaterialtoenamel.Buttheheatgeneratedduringirradiationproducesdamageondentalpulp,whichlimitsthelaserapplicationsondentalhardsurfaces.
简介:Weproposethatdomaininversioncanbedirectlyinducedbyfemtosecondlaserboththeoreticallyandexperimentally,whichopensapathtoachievethree-dimensional(3D)nonlinearcrystalwithaperiodinsub-micron-scale.Asimulationofdomaininversionismodeledbyconsideringthetemporaldistributionoffemtosecondpulses.Thecalculationresultsclarifythatthedomaininversionscanhappenwithinoraftertheinteractionwiththelaserpulse,andtheresponsetimeofdomaininversionisinthepicosecondleveldependingontheintensityandthematerials.Thedomainreversalwindowsoflithiumniobatebyfemtosecondlaserareobservedwhichagreeswiththeoreticalpredictionsqualitatively.
简介:TheuseoftheLaserMegaJoulefacilitywithintheshockignitionschemehasbeenconsidered.Inthefirstpartofthestudy,one-dimensionalhydrodynamiccalculationswereperformedforaninertialconfinementfusioncapsuleinthecontextoftheshockignitionschemeprovidingtheenergygainandanestimationoftheincreaseofthepeakpowerduetothereductionofthephotonpenetrationexpectedduringthehigh-intensityspikepulse.Inthesecondpart,weconsideredaLaserMegaJouleconfigurationconsistingof176laserbeamsthathavebeengroupedprovidingtwodifferentirradiationschemes.Inthisconfigurationthemaximumavailableenergyandpowerare1.3MJand440TW.Optimizationofthelaser–capsuleparametersthatminimizetheirradiationnon-uniformityduringthefirstfewnsofthefootpulsehasbeenperformed.ThecalculationstakeintoaccountthespecificellipticallaserintensityprofileprovidedattheLaserMegaJouleandtheexpectedbeamuncertainties.Asignificantimprovementoftheilluminationuniformityprovidedbythepolardirectdrivetechniquehasbeendemonstrated.Three-dimensionalhydrodynamiccalculationshavebeenperformedinordertoanalysethemagnitudeoftheazimuthalcomponentoftheirradiationthatisneglectedintwodimensionalhydrodynamicsimulations.
简介:Prolactinisamultifunctionalhormonethatexertsmanyseparatefunctionsandactsasanimportantconnectionbetweentheendocrineandimmunesystems.Thereareincreasingresearchesimplicatingtheroleofprolactininhematopoiesis.Enhancederythropoiesisinpregnantwomenanddirecterythropoieticeffectsinvitroofplasmaeitherfrompregnantorlactatingmicehavebeenreported.Furthermore,regressionoferythroblasticleukemiahasbeenobservedinasignificantnumberofratsafterhypophysectomy.Inthisstudy,theeffectsofrecombinanthumanprolactin(rhPRL)onhematopoiesiswereassessedinirradiatedmice.MiceweretreatedwithrhPRLforfiveconsecutivedaysafterexposuretoalethaldoseorasub-doseirradiation.Prolongedsurvivalrateandincreasederythropoiesiswereobservedintheirradiation-inducedmyelosuppressivemice.ItwasconcludedthatrhPRLmightactonerythropoiesisandcouldbeapotentialcandidateforthetreatmentofirradiation-inducedmyelosuppresioninclinic.Cellular&MolecularImmunology.
简介:THEHEMORHEOLOGYCHANGEINISCHEMICREGIONBYCORONARYSTENOSISAFTERLASERIRRADIATIONONBLOODTHEHEMORHEOLOGYCHANGEINISCHEMICREGIONBYCOR...
简介:Toreproducetheprematureruptureprocessofmetalsheetsubjectedtolaserirradiationwithsubsonicairflow,whichisaninterestingphenomenonobservedintheexperimentsgivenbyLawrenceLivermoreNationalLaboratory,acouplednumericalmodelconsideringtheinteractionandevolutionofmetalelastoplasticdeformationandaerodynamicpressureprofileispresented.Withthethermalelastoplasticconstitutiverelationshipandfailurecriterion,thesimulatedfailuremodesanddynamicruptureprocessarebasicallyconsistentwiththeexperimentalresults,indicatingplasticflowandmultiplefracturingisthemainfailuremechanism.Comparedwiththecaseofnon-airflow,subsonicairflownotonlyacceleratesdeformation,butalsoturnsthebugledeformation,plasticstrainandrupturemodeintoasymmetric.