简介：UsingthedensityfunctionaltheoryandthenonequilibriumGreen’sfunctionmethod,westudiedthefinite-biasquantumtransportinaCr/graphene/Crmagnetotunneljunction(MTJ)constructedbyasinglegraphenelayersandwichedbetweentwosemi-infiniteCr(111)electrodes.Wefoundthatthetunnelingmagnetoresistance(TMR)ratiointhisMTJreached108%,whichisclosetothatofaperfectspinfilter.Underanexternalpositivebias,wefoundthattheTMRratioremainedconstantat65%,incontrasttoMgO-basedMTJs,theTMRratiosofwhichdecreasewithincreasingbias.TheseresultsindicatethattheCr/graphene/CrMTJisapromisingcandidateforspintronicsapplications.

简介：ConstructingareasonablereactionkineticmodelforCr-containingwasteincinerationisofhighsignificancetostudytheeffectofvariousfactors,suchastemperature,Cl,onitshexavalentchromiumcompounds.Inthispaper,aprimaryCr/H/Air/ClreactionkineticmodelisbuiltandstudiedbyGaussian03codewithquantumchemistrytheory.Numericalresultsshowthattherearetwooverallreactionsinthemodel,eachofthetwooverallreactionsconsistsoftheirrespectivetwoelementaryreactions.Sothetwooverallreactionsshouldbeomittedfromthemodel.Instead,thefourelementaryreactionsshouldbeaddedintheCr/H/Air/Clreactionkineticmodel.Theactivationenergiesofthefourelementaryreactionsarealsocalculated.

简介：Tounderstandtheelectronicandmagneticproperties,wehavestudiedCr-dopedzinc-blendeAINsystemindetailbyapplyingafirst-principleplanewavepseudopotentialmethodbasedonthedensityfunctionaltheorywithinthelocalspindensityapproximation.Theanalysesofthebandstructures,densityofstates,exchangeinteractions,andmagneticmomentsshowthatAl_(1-x)Cr_xNalloysmayexhibitahalf-metallicferromagnetismcharacter,thatCrinthediluteddopinglimitformsnear-midgapdeeplevels,andthatthetotalmagnetizationofthecellis3μ_BperCratom,whichdoesnotchangewithGrconcentration.Moreover,wehavesucceededinpredictingthatAl_(1-x)Cr_xNalloysinx=0.0625hasaveryhighCurietemperature,andfindthatferromagneticexchangeinteractionbetweenmagneticdopantsisshort-ranged.

简介：我们报导自我开始的femtosecondCr:forsterite激光由1064-nmYb抽了的高度有效、高的力量做了纤维激光。五啁啾镜子被用来补偿intra洞组延期分散，并且锁模式被一个半导体开始可饱和的吸收器镜子(SESAM)。在7.9W的泵力量下面，有760mW的平均力量的稳定的femtosecond激光脉搏被获得，产出12.3%的泵力量斜坡效率。测量脉搏持续时间并且光谱带宽(FWHM)是46fs和45nm；重复率是82MHz。[从作者抽象]

简介：Vanadiumalloys(V-Cr-Tiseries)areimportantcandidatematerialsforblanketcomponentsoffusionreactorsduetotheirlowactivationandhighstrengthatelevatedtemperatures.Low-temperatureirradiationembrittlementdeterminestheoperationtemperaturelimitofVanadiumalloysfortheapplicationtostructuralmaterialsoffusionreactorsirradiationresponseofvanadiumalloysneedstobeclarifiedfortheirapplication.Inthepresentstudy,specimensoftwoalloys(V-4Cr-4TiandV-5Cr-5Ti)wereirradiatedwithenergeticHeionsandheavyionstounderstandhardeningofthealloysduetoheliumaccumulationandcascadedamageproduction.

简介：Co(II)-salenwasencapsulatedinMIL-100(Cr)metalorganicframeworkby"shipinabottle"tosynthesizeanewelectrocatalyst,Cosalen@MIL-100(Cr).ThematerialwascharacterizedbyXRD,FT-IR,UV-VisandN2-adsorption.TheCosalen@MIL-100(Cr)modifiedglassycarbonelectrodeexhibitsawell-definedreductionpeakatthepotentialof–0.21Vtowardtheoxygenreductionreaction(ORR)bycyclicvoltammetry(CV)inpH=6.84phosphatebuffer.Almost400mVpositiveshiftofpotentialatCosalen@MIL-100(Cr)modifiedelectrodeforORRcomparedwiththatatbareglassycarbon,indicatesthatCosalen@MIL-100(Cr)possessesexcellentelectrocatalyticactivity.ThetransferrednumberofelectronsforORRwasdeterminedbychronocoulometry.TheresultsuggeststhattheintroductionofCo(II)-salencomplexintoMOFincreasestheelectrocatalyticactivityviaafour-electronreductionpathway.Furthermore,thiselectrocatalystexhibitsgoodstabilityandreproducibility.

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简介：WeconstructaclassofintegrablegeneralizationofTodamechanicswithlong-rangeinteractions.ThesesystemsareassociatedwiththeloopalgebrasL(Cr)andL(Dr)inthesensethattheirLaxmatricescanberealizedintermsofthec=0representationsoftheaffineLiealgebrasCr(1)andDr(1)andtheinteractionspatterninvolvedbearsthetypicalcharactersofthecorrespondingrootsystems.WepresenttheequationsofmotionandtheHamiltonianstructure.Thesegeneralizedsystemscanbeidentifiedunambiguouslybyspecifyingtheunderlyingloopalgebratogetherwithanorderedpairofintegers(n,m).Itturnsoutthatdifferentsystemsassociatedwiththesameunderlyingloopalgebrabutwithdifferentpairsofintegers(n1,m1)and(n2,m2)withn2＜n1andm2＜m1canberelatedbyanestedHamiltonianreductionprocedure.Forallnontrivialgeneralizations,theextracoordinatesbesidesthestandardTodavariablesarePoissonnon-commute,andwheneithernorm≥3,thePoissonstructurefortheextracoordinatevariablesbecomessomeLiealgebra(i.e.theextravariablesappearlinearlyontheright-handsideofthePoissonbrackets).Inthequantumcase,suchgeneralizationswillbecomesystemswithnoncommutativevariableswithoutspoilingtheintegrability.

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简介：Wereportedabifunctionalmaterial,Cr-salenimplantedconjugatedmicroporouspolymer(Cr-CMP),whichisabletocaptureexcellentCO2amountsandhasaremarkablecatalyticactivitytowardsthecycloadditionreactionofCO2toepoxidesformingcycliccarbonatesatmildconditionswithoutadditionalsolvents.ThisheterogeneousCr-CMPcatalysthasasuperiorcatalyticactivitytoitsrelatedhomogeneouscatalystandcanbereusedmorethantentimeswithoutasignificantdecreaseincatalyticactivity.

简介：DigitaldecayspectroscopyofactinideisotopesatthegasfilledseparatorSHANSAlloverthechartofnuclides,theregiontothe“north-east”of208Pb,withZ≥84andN=128~130,hoststheshortest-livedαradioactivities,withhalf-livesintherangeofnanosecondstomicroseconds.Synthesisanddetectionofneutron-deficientisotopesabovethoriuminthisregionarechallengingduetotheirlowproductioncrosssectionsandshorthalf-lives.

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简介：实现了X型腔全固态端面泵浦Cr:LiSAF激光器的高效率输出和宽谱调谐。斜效率最高为33.3%，在吸收泵浦功率为650mW时，输出功率最高达160mW。在谐振腔内插入双折射滤光片（BF)调谐，调谐范围达787.952nm。测量了激光器的光谱、光束质量等，分析了激光器效率和调谐范围的限制因素。研究表明，X型腔全固态端面泵浦的Cr:LiSAF激光器可以实现高效的近红外宽谱调谐输出。

简介：Therearemoreandmorecountriestoakeanefforttothestudiesofvanadiumalloyforfusionapplication.NIFSinJapanhasrecentlydevelopedan80kgheatV4Cr4Tialloy(NIFS-heat2)aftertheproductionofa500kgscaleV4Cr4TiinU.S.severalyearsago.PropertyevaluationofthealloyhasbeenputintoaninternationalcollaborationprogramunderthecoordinationofIEA(InternationalEnergyAgency).SWIPhasjoinedthecollabrationonthehydrogenembrittlementresistanceevaluationofthealloyt.

简介：钨基合金由于具有高密度、高强度及高冲击韧性等优异性能而得到广泛应用。它在军事工业中主要用作穿甲弹、动能弹和导弹弹头。我单位对高密度钨基合金材料的研究已有多年历史，重点研究了添加Co，Mn，Cr等元素对钨基合金性能的影响，并研制出一系列密度和力学性能的钨基合金。

简介：Thephotonpolarizationtensorcarriesthefundamentalinformationofmagnetizedvacuumormedium[1{5].Acompletedescriptionofthevacuumpolarizationtensorisparticularlycomplicatedtoapproach,sincethevacuumphotonpolarizationtensorisexpressedintermsofadoublesummationofinfiniteserieswithrespecttotwoLandaulevelsoccupiedbyvirtualchargedparticles.MostworkswerefocusingonthestrongfiledlimitwithanassumptionofLowestLandauLevel(LLL)[2,6]InRef.[7]weobtainedafulldescriptionofvacuumpolarizationtensorinresponsetoalltheLandaulevelsatanyfieldstrengthofBforthefirsttimebeyondLLLapproximation,andwefoundoutthattheimaginarypartofthephotonpolarizationtensorξΠbecomesnonzeroatthetimelikemomentaregionQ2>4(M2+2neB)atT=0,i.e..,theLLLapproximationisanalyticallysatisfied[3,7].

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简介：HIRFL-CSRacceleratorfacilityhasbeenoperatingwith3ionsources,whichareLAPECR1,LECR3andSECRAL.Theseionsourcescanprovidedifferentkindsofionswithdifferentenergy.Forexample,LAPECR1mainlyprovidesH+andHe+witheextractionvoltageabove25keV,LECR3canprovidetheionbeamswithlowtomediumchargestates,includingthemetallicionswithlowmass,suchasC^4+,Ar^11+,B^3+,Mg^7+,etc.,whileSECRALaimstoproduceintenseandhighlychargedionbeams,especiallymetallicones,suchlikeKr^19+,Xe^31+,Ni^19+,Bi^31+,U^33+,andsoon.

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