简介:合成了氰根桥联配合物Co[Fe(CN)5NO].5H2O,使用元素分析、热重分析、红外光谱、XRD对配合物进行了表征。红外光谱显示金属离子通过氰根桥联即FeII-CN-NiII传递磁相互作用,是属于桥式氰根配体的CN伸缩振动,而粉末XRD衍射图表明此化合物为面心立方体结构(FCC),空间群为Fm3m(225),晶格常数a=10.2856。通过对该配合物的直流变温磁化率和交流磁化率测定表明金属离子通过氰根传递弱反铁磁作用,根据Curie-Weiss定律,拟合数据获得居里常数C=1.55cm3·K/mol,顺磁居里温度θ=-1.87K。
简介:Thestructuralproperties,mechanicalbehavior,andelectronicstructureofthenewlydevelopeddiamondlikeBC5(d-BC5)wasinvestigatedusingdensityfunctionaltheory(DFT)calculations.Theresultsindicatethatd-BC5hasgreatbulkmodulusof393GPa,largeshearmodulusof398GPa,andhighhardnessof62Pa,andthussupportthefactthatd-BC5isanultra-incompressibleandsuperhardmaterial.Remarkably,thesuperhardd-BC5exhibitsmetallicfeatures.Furthermore,thetrendthatthemechanicalbehaviorfallswiththeincreaseofboroncontentwasrevealed.Thecombinationofhugestiffness,highhardness,andgoodmetallicitymakesseriesofdiamondlikeBCx(d-BCx)validforwiderapplicationsincomparisonwithpurediamond.
简介:DarkMatterParticleExplorer(DAMPE)isapowerfulspacetelescopeforhighenergycosmicraysdetectionsuchas-ray,electronandheavyions.ThemainmotivationofDAMPEistofindtheevidenceofdarkmatterexistence,andthesatelliteisscheduledforlaunchingbeforetheendof2015.ThePlasticScintillatorDetector(PSD),whichisoneofthekeycomponentsoftheDAMPEsystem,hastwomajorfunctionalities:distinguishphotonsfromchargedparticlesbyanti-coincidenceandmeasurethechargeofheavyions.ThePSDisdesignedandfabricatedbytheinstituteofmodernphysics,CAS.Itconsistsof82plasticscintillatorstrips,eachofwhichisreadoutbyPMTatbothends,andadouble-dynodereadoutschemeforPMTisutilizedinordertocoverthelargedynamicrange(fromHtoCa).
简介:Inthiswork,webrieflydiscussanovelclassofmodifiedgravitylikef(T,TG)gravity.Inthisbackground,weassumethenewagegraphicversionofpilgrimdarkenergyandreconstructf(T,TG)modelsfortwospecificvaluesofs.Wealsodiscusstheequationofstateparameter,squaredspeedofsoundandwDE-wDEplaneforthesereconstructedf(T,TG)models.Theequationofstateparameterprovidesphantom-likebehavioroftheuniverse.ThewDE-wDEplanealsocorrespondstoΛCDMlimit,thawingandfreezingregionsforbothmodels.
简介:Asimplemethodisappliedtocalculatingtheisotopeshifts(ISs)on5S1/2→4D3/2,5/2transitionsof87,88Sr+.FirstwehavecalculatedtheISsoflowertransitionsonaseriesofalkali-likesystemssuchasB2+,Ca+andBa+,whichareinagreementwithotherworks.ThentheISson5S1/2→4D3/2,5/2transitionsof87,88Sr+,whichareusefultostudytheSr+opticalfrequencystandard,areevaluated.
简介:根据机载光电平台的特点,建立了6个坐标系统,进行了8次线性变换,构建了从光电平台成像系统像面坐标系到大地地理坐标系的目标定位数学模型。计算了目标在大地地理坐标系的经纬度和高程坐标,分析了各种测量参数对目标定位精度的影响。通过建立误差模型和仿真数据进行目标定位实验,采用蒙特卡罗方法统计目标定位误差。实验结果表明,载机经纬度误差、载机姿态角度误差及光电平台指向角度误差是影响目标定位精度的主要因素,其中载机经纬度误差直接传递到目标定位误差,载机姿态角度误差和光电平台指向角度误差大体上以10-4~10-2比例作用到目标定位误差。本文方法有效可行,对机载光电平台目标定位具有实用价值。
简介:Vanadiumalloys(V-Cr-Tiseries)areimportantcandidatematerialsforblanketcomponentsoffusionreactorsduetotheirlowactivationandhighstrengthatelevatedtemperatures.Low-temperatureirradiationembrittlementdeterminestheoperationtemperaturelimitofVanadiumalloysfortheapplicationtostructuralmaterialsoffusionreactorsirradiationresponseofvanadiumalloysneedstobeclarifiedfortheirapplication.Inthepresentstudy,specimensoftwoalloys(V-4Cr-4TiandV-5Cr-5Ti)wereirradiatedwithenergeticHeionsandheavyionstounderstandhardeningofthealloysduetoheliumaccumulationandcascadedamageproduction.
简介:ThemagneticpropertiesofCeRhln5arestudiedbyfirst-principlescalculation.Spin-orbitcouplingisconsideredaswellasdifferentcorrectionsincludinglocaldensityapproximationpluson-siteCoulombinteractionU(U=1,1.5,3eV)andorbitalpolarization.TheresultsshowtheexistenceofonlymoderatecorrelationinCeRhln5andCe-4felectronsareontheborderoflocalizationanditinerancy.Theeffectofpressurebychangingthevolumeoftheunitcellisalsostudied.