学科分类
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225 个结果
  • 简介:由用计算机模拟调查的相对论的电子过时的人或物短脉搏激光散布的线性Thomson。它被看那~3的强烈激光脉搏散布3fs在半最大值的完整的宽度,与γ_的一个电子0=10起始的精力,在向后的方向与2.5nm的光子波长产生76attoseconds的超短波的、搏动的放射。一个高度相对论的电子产生的散布放射与更低的相对论的精力电子产生的那相比以它的脉搏宽度和尖分发有优异质量。

  • 标签: X射线脉冲 线性汤姆森散射 强激光束 相对论性电子
  • 简介:Objective:Todetectsuperoxideanion(O-2)signalsintheheart,liver,lungandkidneytissuesafterburns.Methods:Twenty-fourmaleratswererandomizedinto4groups.Theratsofexperimentalgroupswereimmersedin100℃waterfor15secondsand25%third-degreeburnwascreated.Thoracotomyorlaparotomywasperformedat5,10,15,20and30minutesafterburn,andspecimensoftheheart,lung,liverkidneywereobtainedforburnedrats.Thespecimenswerethenpreservedinliquidnitrogenforcryo-preservationanddetectedimmediatelyusingEPR.Results:ThesignalsofsuperoxideOradicalappearedintheheart,lung,liverandkidneyspecimens10-15minutesafterburn.Conclusions:Thereisadirectevidenceofoxygenfreeradicals(OFRs)injurytovisceraofburnedratsbetween10-15minutesafterburn.

  • 标签: 烧伤 氧自由基 磁共振检查 动物实验 内脏
  • 简介:微结构和电子横梁的机械描述焊接了伪造Ti-6Al-4V的关节被调查。Microhardness测试显示熔化地区(FZ)的坚硬比影响热的地区(HAZ)和贱金属的高。张力的结果证明焊接关节的机械性质以静态的力量与贱金属的那些是可比较的并且根据在微观结构和焊接关节的机械性质之间的关系。焊接的最终的张力的强度等于时漏关节的,它显示横向的FZ的纵的FZ和那些的机械性质是一样。基础材料,关节,和焊接标本的Macromechanical行为和macrofracture和microfracture被观察。在标本破裂现象的三种类型之中的比较揭示下列特殊差别:(1)破裂模式,(2)在中央区域的酒窝模式的显微图,并且(3)在中央区域和转变区域的酒窝的尺寸。

  • 标签: TI-6AL-4V合金 焊接接头性能 拉伸性能 电子束 失效分析 力学性能
  • 简介:StudiesontheElectronTransferCentersofAminoOxidaseImmobilizedonSelf┐AsemblyMonolayerUsingElectrochemicalMethods*LIJing-hong,CH...

  • 标签: Direct ELECTROCHEMISTRY SELF assembled MONOLAYER AMINO
  • 简介:明确的表达以前由作者介绍了因为库仑积分被概括到另外的二中心的积分,除了交换积分。在这个框架以内,分子的积分与递归地评估的著名不完全的gamma功能和这些功能有关仔细以一些新功能被表示。在混合积分的情况中产生的特刊被处理,并且结果与在文学发现的相比。

  • 标签: 分子积分 重叠积分 混合积分 库仑积分 斯莱特轨道 椭圆坐标
  • 简介:Asasuccessiveworkofourpreviouspaper,^1theelectrontransfermatrixelement(Vrp)intheoxidationofthesimplifiedmodelmoleculeofα-aminocarbon-centeredradicalbyO2hasbeeninvestigatedwithabinitiocalculationatthelevelofUHF/6-31G**.Basedontheoptimizedgeometriesofthereactgantandtheion-paircomplexobtainedpreviously,thereactionheatandtheiunerreorganizationenergyhavebeenobtainedbyconstructingthepotentialenergycurvesofreactantandproductstatesconsideringthesolventeffectwiththeconductor-likescreeningmodel(COSMO).ThesolventreorganizationenergyhasbeenestimatedusingLippert-Matagarelationship.ThecalculatedresultsshowthatthevalueofVrpisseveraltimeslargerthanthatofRT,whichmeansthatthemodelreactionisanadiabaticone.Theoreticalinvestigationindicatesthatthesolventeffectonthedirectelectrontransfer(ET)processofoxidationofα-aminocarbon-centeredradicalbyoxygenisremarkable.

  • 标签: 溶解能 电子转移 理论研究 基体元素 氧化物 反应机理
  • 简介:Thisisafollowofpreviousworkentitled"OneElectronAtominSpecialRelativitywithdeSitterSpaceTimeSymmetry"[Commun.Theor.Phys.57(2012)930].Inthispaper,weconsiderthehigherordercalculationsandcontributionsinthepreviousframeworktosolveoneelectronatomsindeSitterinvariantrelativisticquantummechanics.Thenext-to-leading-ordercalculationsin1/R2-expansionsshowthatthefine-structureconstantαisvariantwithcosmologictimegoingbyinthedeSitterinvariantspecialrelativisticquantummechanicswithstandardFRWcosmologicmodel.

  • 标签: hydrogen ATOM special RELATIVITY with de
  • 简介:Forelectronicmicroscopicobservation,wefoundSSV-transformedNIH3T3cellsweredifferentfromnon-transformedcells.InSSV-transformedNIH3T3cellsnucleicytoplasmaratiowasincreasedandincytoplasmatheribosomes(polyribosomeswereattachedtotheswollenroughendoplasmicreticulum.Itwaslikelythatribosomeswerelinedtogetherfunctionallyandstructionallytoproducespecificprotein(PDGF-likeprotein).

  • 标签: endoplasmic reticulum transformed functionally LIKELY ATTACHED
  • 简介:ElectronMicroscopicIn-situObservationforPreparationofUltrafineLa2O3NanophasePowderGaoYuzun(高愈尊),LiYonghong(李永洪),ZhangTaisong...

  • 标签: La2O3 NANOPHASE Insitu OBSERVATION High voltage
  • 简介:ObjectivesTocomparethedifferentpatternsofcoronaryarterycalcification(CAC)inacuteandchroniccoronarysyndromesutilizingelectronbeamcomputedtomography.BackgroundPathologic,angiographic,andintracoronaryultrasoundstudiesrevealedsharpdifferencesintheplaquemorphologybetweenpatientswithacuteversuschroniccoronarysyndromes.Whethertherearedifferentpatternsofcoronaryarterycalcificationinpatientswithstableanginapectoris(SAP)andinthosewithunstableanginapectoris(UAP)oracutemyocardialinfarction(AMI),however,remainsunclear.MethodsTwohundredandsixty-fourpatients,including67withSAP,94withUAPand103withAMIwerestudiedwithelectronbeamcomputedtomographyforanalysisofcoronaryarterycalcificationandwithselectivecoronaryangiographyfordeterminationofatheroscleroticlesions.CACprevalenceandcalciumscorewerecomparedamongthreegroups,andrelationofCACtotheseverityofatheroscleroticdiseaseintheSAPandUAP

  • 标签: CORONARY ARTERY disease Calci-fication Tomography/X -
  • 简介:从激光的单音的精力充沛的电子横梁的自我注射和加速弄醒地加速器首先在高度相对论的政体被调查,用100TW班,27fs激光脉搏。有象一样高的精力的Quasi-monoenergetic捆得多的横梁多--百兆电子伏与显示自我开水道的形成和电子的自我注射进血浆的散布方面的排出物的同时的大小被观察醒来,叫作一个“水泡”。三维的particle-in-cell模拟与1.5GeV/cm的坡度证实了电子捆的多重自我注射进水泡和他们的横梁加速。

  • 标签: 单色电子束 散射 加速器 相对论
  • 简介:Changesoftheaveragebrightnessandnon-uniformityofdarkoutputimages,andqualityofpicturescapturedundernaturallightingforthecolorCMOSdigitalimagesensorsirradiatedatdifferentelectrondoseshavebeenstudiedincomparisontothosefromtheγ-irradiatedsensors.Fortheelectron-irradiatedsensors,thenon-uniformityincreasesobviouslyandasmallbrightregiononthedarkimageappearsatthedoseof0.4kGy.Theaveragebrightnessincreasesat0.4kGy,increasessharplyat0.5kGy.Thepictureisveryblurryonlyat0.6kGy,showingthesensorundergoessevereperformancedegradation.ElectronradiationdamageismuchmoreseverethanγradiationdamagefortheCMOSimagesensors.Apossibleexplanationispresentedinthispaper.

  • 标签: 辐射损伤 电子辐射 Γ辐射 互补金属氧化物半导体 彩色摄象传感器 输出特性
  • 简介:Whistler-modechoruswavesareregardedasanimportantaccelerationmechanismcontributingtotheformationofrelativisticandultra-relativisticelectronsintheJovianradiationbelts.QuantitativedeterminationofthechoruswavedrivenelectronscatteringeffectintheJovianmagnetosphererequiresdetailedinformationofbothambientmagneticfieldandplasmadensityandwavespectralproperty,whichhowevercannotbealwaysreadilyacquiredfromobservationsofexistedmissionstoJupiter.WethereforeperformacomprehensiveanalysisofthesensitivityofchorusinducedelectronscatteringratestoambientmagnetosphericandwaveparametersintheJovianradiationbeltstoelaboratetowhichextentthediffusioncoefficientsdependonanumberofkeyinputparameters.Itisfoundthatquasi-linearelectronscatteringratesbychoruscanbestronglyaffectedbytheambientmagneticfieldintensity,thewavelatitudinalcoverage,andthepeakfrequencyandbandwidthofthewavespectraldistributionintheJovianmagnetosphere,whiletheyonlyrelyslightlyonthebackgroundplasmadensityprofileandthepeakwavenormalangle,especiallywhenthewaveemissionsareconfinedatlowerlatitudes.Giventhechoruswaveamplitude,chorusinducedelectronscatteringratesstronglydependonJovianL-shelltoexhibitatendencyapproximatelyproportionaltoLJ3.OurcomprehensiveanalysisexplicitlydemonstratestheimportanceofreliableinformationofboththeambientmagnetosphericstateandwavedistributionpropertytounderstandingthedynamicelectronevolutionintheJovianradiationbeltsandthereforehasimplicationsforfuturemissionplanningtoexploretheextremeparticleradiationenvironmentofJupiteranditssatellites.

  • 标签: Jovian radiation BELTS whistler-mode CHORUS RESONANT
  • 简介:ThelaserphotolysisofN-diisopropylphosphoryltryptophyltyrosinedipeptidemethylester(N-DiPP-TrpH-TyrOH)hasbeencarriedoututilizingaKrF(248nm)laser.ThedirectintramolecularETbetweenTrpH+residueandTyrOHresiduewasdetectedfirstandtheETbetweenTrpandTyrOHbecameslow.Itwassuggestedthatphosphorylgroupstabilizeneighbourradicalofaromaticringbyhyperconjugation.IncombinationwithcomputermodelingweobtainedthekineticparametersoftheETandprovedthatphosphorylgroupstookpartintheprocessofET.Theresultsshouldbesignificantforbiologicalsystemsinceeverybiologicalprocessinvolvesthephosphorylationornonphosphorylation.

  • 标签: Electron TRANSFER phosphorylated PEPTIDE PHOTOLYSIS
  • 简介:基于从一个电离房间的双格子分析导致的信号,在二个格子之间的电子飘移时间被决定,电子飘移速度被导出。波形digitizer被采用从电离房间的二个格子记录脉搏。电子飘移速度为Ar+CH4混合物的八不同比率作为减少的电场E/p的功能被测量。由分析这研究的试验性的数据,试验性的数据的自我一致性被完成,并且为在Ar+CH4混合物的任何比率的精明的电子飘移速度的公式被获得。

  • 标签: 电子漂移 漂移速度 混合使用 甲烷 网格法
  • 简介:Objective:Tofurtherinvestigatetheosteogenicpotentialofrabbitmarrowstromalstemcellsculturedinvitro.Methods:Rabbitmarrowstromalstemcellswereisolatedbydensitygradientcentrifugationmethodandamplifiedintheflasks,usingtheosteogenicinducingconditions(OGC)astheculturemedia.Theosteogenicpotentialofmarrowstromalstemcellswereinvestigatedbymeansofbone-seekingfluorescenc(tetracycline)labeling,AlizarinredS(ARS)staining,Alcianblue-Siriusred(AS)staining,andscanningelectronmicroscope.Results:Afterbeingpassaged,themarrowstromalstemcellsincreasedinnumber,becameconfluentandformedmulti-layerstructure.Thestromalstemcellsexcretedinnumerabletinygranules,heapinguponthecellbodyandmerginggraduallyintofoggysubstances.Thesefoggysubstanceskeptonenlargingandformedround,oval,orflake-likenodules.Thesenodulesrevealedbrightgoldenyellowfluorescenceunderfluorescencemicroscopewhenlabeledwithtetracycline.HistochemicalstudywithspecificnewbonestainingwithARSrevealedpositivecalciumreaction,bothdenotingthattheywerenewlyformedbonetissues.AftertheywerestainedwithAS,collagenandacidmucopolysaccharidewereshown.Underscanningelectronmicroscope,threetypesofcellswithdifferentconfigurationswerefound.Theywereglobularcells,spindle-shapedcellsandpolygonalorpolygonalcells.Granuleswereexcretedfromthecellsandheapeduponthecellbody.Needle-shapedandirregularlyrectangularcrystalsalsoappearedandagglomeratedwiththegranulestoformnodulesandtrabecula-likeorflake-likestructures.Conclusions:Sequenceofeventsofboneformationbyrabbitmarrowstromalstemcellsculturedinvitroisfullydepictedandconfirmed,whichprovidesthefoundationforfurtherinvestigatingthemechanismsofosteoblastdifferentiationfrommarrowstromalstemcellsandthepossibleapplicationinorthopaedics.

  • 标签: 家兔 骨髓基质干细胞 体外培养 成骨能力 组织化学 扫描电镜