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简介：利用微扰理论，研究一维区域运动的自由电子，在受到弱周期势场的作用，给出在这种周期势场中的一维电子能谱，并与自由电子的能谱作比较。

简介：Non-smallcelllungcancer(NSCLC)accountsfor85%oflungcancer,whichistheleadingcauseofdeathinlungcancerpatient.RoutinetreatmentofNSCLCcannoteffectivelychangethesurvivalrateofpatients,oneimportantreasonistheincreasedradioresistanceoftumorcellsafterconventionalradiotherapy.

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简介：ThelocalstructuresoftheimmiscibleFe100-xCuxalloys(x=0,10,20,40,60,80and100)producedbymechanicalalloyinghavebeeninvestigatedbyXAFS.FortheFe100-xCux(x≥40)solidsolutions,thelocalstructuresaroundFeatomschangefrombccstructuretofcconeandtheCuatomsmaintaintheoriginalcoordinationgeometryaftermillingfor160hours.Onthecontrary,thelocalstructuresaroundCuatomsinbothofFe80Cu20andFe90Cu10alloysappearatransitionfromfcctobccstructure.WefoundthattheDebye-wallerfactorσoffccFe-CuphaseislargerthanthatofbccF-Cuphase,andtheσ(0.099A°)aroundFeatomsislargerthanthat(0.089A°)ofCuintheFe100-xCux(x≥40)solidsolutions,ThissuggeststhatthemechanicallyalloyedFe100-xCuxsupersaturatedsolidsolutionisnotahomogeneousalloy,andconsistsofFe-richandCu-richregionsforvariouscompositions.Apossiblemechanismforbcc-to-fccandfcc-to-bccchangesinFe100-xCuxsolidsolutionsisdiscussedinrelationtotheinterdiffusionandtransitioninducedbytheballmilling.

简介：Zr1-xTixCo(x=0,0.1,0.2,0.3)alloyswerepreparedbyarc-meltingmethodandtheeffectofTisubstitutiononhydrogenstoragepropertieswasstudiedsystematically.Hydrogendesorptionpressure-composition-temperature(PCT)measurementswerecarriedoutusingSievert’stypevolumetricapparatusforZrCo(at473K,573Kand673K)andZr1-xTixCoalloys(at673K),respectively.ProductsafterdehydrogenationwerecharacterizedbyX-raydiffraction(XRD).Inaddition,thekineticsofZr1-xTixCohydridewasinvestigatedat473Kand673K,respectively,underhydrogenpressureof5MPa.ResultsshowedthatTisubstitutionforZrdidnotchangethecrystalstructureofZrCophase.Withtheincreaseoftemperaturefrom473Kto673K,theextentofdisproportionationforZrCoalloyincreased.WithTicontentincreasingat673K,thedesorptionequilibriumpressureofZr1-xTixCo-H2systemselevatedandthedisproportionationreactionofZr1-xTixCoalloyswasinhibitedeffectively.TisubstitutiondecreasedthekineticsrateandtheeffectivehydrogenstoragecapacityofZr1-xTixCoalloysslightly.Generallyspeaking,itwasfoundthatZr0.8Ti0.2Coalloyhadbetteranti-disproportionationpropertywithlessdecreaseofeffectivehydrogenstoragecapacitywhichwasbeneficialtotritiumapplicationintheInternationalThermonuclearExperimentalReactor(ITER).

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简介：Fe_(3–x)O_4raspberryshapednanostructures/graphenenanocompositesweresynthesizedbyaone-steppolyol-solvothermalmethodtobetestedaselectrodematerialsforLi-ionbattery(LIB).Indeed,Fe_(3–x)O_4raspberryshapednanostructuresconsistoforiginalorientedaggregatesofFe_(3–x)O_4magnetitenanocrystals,ensuringalowoxidationstateofmagnetiteandahollowandporousstructure,whichhasbeeneasilycombinedwithgraphenesheets.TheresultingnanocompositepowderdisplaysaveryhomogeneousspatialdistributionofFe_(3–x)O_4nanostructuresatthesurfaceofthegraphenesheets.TheseoriginalnanostructuresandtheirstronginteractionwiththegraphenesheetsresultedinverysmallcapacityfadinguponLi+ionintercalation.Reversiblecapacity,ashighas660mAh/g,makesthismaterialpromisingforanodeinLi-ionbatteriesapplication.

简介：WehavestudiedtheangularmagnetoresistanceofironpnictidesBaFe2-xNixAs2,whichshowsclear180degreeperiodicityasfittedbyacosinefunction.Inthex=0.065sample,thephaseofthetwo-foldsymmetrychanges90degreesabovethetetragonal-to-orthorhombicstructuraltransitiontemperatureTs.Sincethephaseatlowtemperatureisassociatedwiththerotationoforthorhombicdomainsbymagneticfield,weshowthatevenvacuumgreasecanpushthepresenceoforthorhombicdomainsattemperaturesmuchhigherthanTs.Ourresultssuggestthatresidualstressmayhavesignificanteffectsinstudyingthenematicordersanditsfluctuationsinironpnictides.

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简介：cJUNNH2-terminalkinase(JNK)hasbeenreportedtoplayimportantrolesinregulatingthecellularapoptosisandautophagy.However,accuratemechanismandhowthebalanceoftheseactivitiesdeterminesthecellularradiosensitivityremainunclear.

简介：WeinvestigateindetailtheeffectsofR-parityleptonnumberviolationonthedecay~↑b1→b~↑x1^0intheR-parityviolatingminimalsupersymmetricstandardmodel(Rp-MSSM)underthepresentexperimentalconstraintsonRpparameters.Inournumericalcalculationsweconsidertwocasesofinputparametersofthesquarkandsleptonsectors,MsquarkMslepton,forcomparison.TheresultsshowthattherelativeR-parityviolatingcorrectionisnotverysensitivetothemassofthelightestneutralino-0↑x1andthedegenerateR-parityviolatingcouplingparameterλ2′,butstronglydependsonMsquark,Mslepton,tanβandthedegenerateR-parityviolatingcouplingparameterλ1′.Therelativecorrectionisabout-4～3%andcanexceed-6%insomeregionofparameterspace.Therefore,preciseexperimentanalysesonthedecay~↑b1→b~↑x1^0mayprovideaprobeoftheR-parityviolation.

简介：TodepictthedetailsthatCHOP(C/EBPhomologousprotein)regulatesautophagyandapoptosisinbreastcancercells,theexpressionofCHOPwasinhibitedbytransfectionwithsiRNAsequence.AsshowninFig.1,radiati-Fig.1CHOPinhibitionbysiRNAatmRNAandproteinlevelsafterradiation.onelicitedahigherexpressionofCHOPintheNCgroupcomparedwithcontrol.However,thishigherexpressionwassignificantlyinhibitedinthesiRNAgroup.

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简介：Twotransmissioncurvedcrystalspectrometersaredesignedtomeasurethehardx-rayemissioninthelaserfusionexperimentofComptonradiographyofimplosiontargetonShenGuang-IIIlaserfacilityinChina.Cylindricallycurvedα-quartz(10–11)crystalswithcurvatureradiiof150and300mmareusedtocoverspectralrangesof10–56and17–100keV,respectively.Thedistancebetweenthecrystalandthex-raysourcecanbechangedoverabroaddistancefrom200to1500mm.Theopticaldesign,includingtheintegralreflectivityofthecurvedcrystal,thesensitivity,andthespectralresolutionofthespectrometers,isdiscussed.WealsoprovidemechanicdesigndetailsandexperimentalresultsusingaMoanodex-raysource.High-qualityspectrawereobtained.Weconfirmedthatthespectralresolutioncanbeimprovedbyincreasingtheworkingdistance,whichisthedistancebetweentherecordingmediumandtheRowlandcircle.

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