简介:Cobaltandnickelcomplexes(1a-1dand2a-2d,respectively)supportedby2-imidate-pyridineligandsweresynthesizedandusedfor1,3-butadienepolymerization.ThecomplexeswerecharacterizedbyIRandelementanalysis,andcomplex1awasfurthercharacterizedbysingle-crystalX-raydiffraction.Thesolidstatestructureofcomplex1adisplayedadistortedtetrahedralgeometry.Uponactivationwithethylaluminumsesquichloride(EASC),allthecomplexesshowedhighactivitiestoward1,3-butadienepolymerization.Thecobaltcomplexesproducedpolymerswithhighcis-1,4contentsandhighmolecularweights,whilethenickelcomplexesdisplayedlowcis-1,4selectivityandtheresultingpolymershadlowmolecularweights.Thecatalyticactivitiesofthecomplexeshighlydependedontheligandstructure.Withtheincrementofpolymerizationtemperature,thecis-1,4contentandthemolecularweightoftheresultingpolymerdecreased.
简介:AsystematicexaminationofRamessesⅡ'slargefamilyofover100childrenandatleastadozenwivesrevealsthattheGreatRoyalWivesNefertariandIsetnofret,alongwiththeirchildren,enjoyedaprivilegedstatuswithinthehierarchicalstructureoftheroyalfamily.NefertariowedhersupremestatustobeingmotherofRamessseⅡ'sfirstbornsonAmunhirkhopeshef,whileRamessesⅡwasstillcrownprinceunderSetyI.Isetnofret'ssonsanddaughterswerealsofavoredbecauseshegavebirthtothesecondbornsonPrinceRamessesJr.IsetnofretherselfdidnotenjoyprominenceonthemonumentsuntilafterthedeathofNefertari,norwassheburiedintheValleyoftheQueens.Theremainingoffspringofthesewivesalsobenefitedfromtheprestigeoftheirmothersandeldestbrothers.OtherearlywivesgavebirthtothemajorityofRamessesⅡ'schildren,butthesewomenarenowcompletelyanonymous.Otherattestedwivesofthekingincludehisfivedaughter-wivesandtwoHittitePrincess-brides.NootherEgyptianwivesareknownforRamessesⅡ.MonumentalsourcesthatprivilegeQueenNefertari,andthechildrenofbothNefertariandIsetnofret,revealahierarchicalstructureoftheroyalfamily.
简介:SECRALIIisthesecondfullysuperconductingECRionsourcedevelopedatIMP.It’salmosttheduplicateofSECRAL,exceptforthecryogenicsystem[1].SECRALIIhasintegratedLHerecondensationsystem,whichhasthedynamiccoolingcapacityofmorethan5W.ThemainparametersofSECRALI&IIareshowninTable1.ThemagnetsofSECRALIIhasbeensuccessfullyfabricatedandtestedin2015.In2016,SECRALIIhasbeencommissionedat18and28GHzwithOandXeionbeams,whichhasgivenverypromisingresults.
简介:Significantelectromagneticpulses(EMP)canbegeneratedbytheintensivelaserirradiatingsolidtargetsininertialconfinementfusion(ICF).ToevaluatetheEMPintensityanddistributioninandoutsidethelaserchamber,wedesignedandfabricatedadisconeantennawithultra-widebandsofover10GHz.Thereturnloss(S11parameter)ofthisantennawasbelow-10dBandcouldevenachieveunder-30dBat3.1GHz.TheEMPintensityinthisstudyat80cmand40cmawayfromthetargetchambercenter(TCC)reached400kV/mand2000kV/m.ThecurrentresultsareexpectedtoofferpreliminaryinformationtostudyphysicsregardinglaserplasmainteractionsandwillalsolayexperimentalfoundationforEMIshieldingdesigntoprotectvariousdiagnostics.