简介：ThespinelLiMn2O4-x(SO4)xcompoundcathodematerialsweresynthesizedbysolid-statereactionofthecalculatedamountsofLiOH·H2O,MnO2andMnSO4.Theresultsoftheelectrochemicaltestdemonstratedthatthesematerialsexhbitedexcellentelectrochemicalproperties.Thehighestreversiblecapacityoftheseseriesofcathodematerialswas-120mAh/g,andafter50cycles,thisreversiblecapacitywasstillaround116mAh/gwithnearly100%reversibleefficiency,whichrevealedthatdopedsulfateioncouldimprovethestructuralstabilityofspinel.

简介：

简介：

简介：Refluxingcalix[4]-1,3-substitutedbenzaldehydederivative(4)withglycinehydrazidederivative,weobtainedanovelcalix[4]arenehydrazonederivative(5)via'1+2'condensationinayieldof78%.Inthereactionofcompound4withL-leucinehydrazidederivativeatroomtemperature,lariatcalix[4]-1,3-aza-crown(6)withchiralaminoacidgroupasbranchedchainwassynthesizedvia'1+1'additioninayieldof70%.Thepreliminaryextractionexperimentssuggestedthathostingcompounds5and6possessedgoodcomplexationabilitiesforα-aminoacids.

简介：AKerr-lens,mode-lockedYVO4∕Nd:YVO4lasercoupledwithanacousto-opticmodulator（AOM）Q-switchingnear1064nmwasemployedtopumpanintracavityKTiOPO4（KTP）opticalparametricoscillator.Asubnanosecondsignalwavenear1572nmwithlowrepetitionratewasrealized.AtanAOMrepetitionrateof8kHz,themaximumoutputpowerwas165mW.Thehighestaveragepulseenergy,theshortestduration,andthehighestpeakpowerofamode-lockingsignalpulsewereestimatedtobe～10.3μJ,～120ps,and～82kW,respectively.

简介：

简介：Thispapergivesaclassificationofcompletehypersurfaceswithnonzeroconstantmeancurvatureandconstantquasi-Gauss-KroneckercurvatureinthehyperbolicspaceH4(-1),whosescalarcurvatureisboundedfrombelow.

简介：

简介：

简介：

简介：Geant4LowEnergyElectromagneticpackageProvidesaprecisetreatmentofelectromagneticinterationsofparticleswithmatterdowntoverylowenergies(250oVforelectronsandphotons,<1keVforhadronsandions),Itincludesaverietyofmodelsfortheelectromagneticprocessesofelectrons,photons,hadronsandions,takingintoaccountadvancefeatures,suchasshelleffectsandeffectsduetochargedependence.Thecomprehensivesetofparticletypesitcanhandle,thevarietyofmodelingapproachesandtheextendedcoverageofenergyrangemakethispackageauniquetoolamongMonteCarlocodesonthemarket,andofrelevancetoserveralexperimentaldomainsinHIEP,astroparticlephysics,spacescienceandbiomedicalstudies.

简介：AseriesofcarboxylicacidswasesterifiedtothecorrespondingesterswithTiCl_4ascatalystatroomtemperature,inhighyields.Thiscatalystwashighlyeffectivefortheselectiveesterificationofprimaryalcoholswithcarboxylicacids,inthepresenceofsecondaryalcohols,andfortheselectiveesterificationofsaturatedacidwithalcoholinthepresenceofconjugatedacidoraromaticacid.Onaccountofthehighyield,highchemoselectivity,mildcondition,andbeingfreeofotherdehydrants,thisisanefficientmethod.

简介：<正>InthispaperwestudysurfacesinS~4andtheirtwistorGaussmaps.SomenecessaryandsufficientconditionsthatthetwistorGaussmapisharmonicaregiven.Wefindmanyexamplesofnonisotropicharmonicmapsfromasurfaceto(?)P~3.

简介：Newboronoalkoxycalix[4]arenesweresynthesizedbyallylation,alkylation,hydroborationandhydrolysisof25,26,27,28-tetrahydroxycalix[4]arene,andidentifiedbyelementalanalysis,IR,1HNMR,13CNMR,11BNMR,MSandUVspectra.ThedataofUVandfluorescencespectrashowedthattctrapropoxycalix-[4]arenetriboronicacidcouldcoordinatesignificantlywithmonosaccharides.

简介：

简介：Duetotheirsize-dependentpropertiesandflexibleprocessingchemistry(Alivisatos,1996),monodispersednanocrystalshaveattractedconsiderableattentionfortheirdistinguishedroleinfundamentalstudiesandtechnicalapplications.AlthoughmuchhasbeenreportedonfabricationofmonodispersedinorganicnanocrystalssuchasFe2O3,CdSe,PbSeandZrO2(Peng&Peng,2002;Zhuetal.,2002;Niederbergeretal.,2002;Pangetal.,2001),littlepublishedonthepreparationofBaSO4nanocrystalsandtheircrystalsizeandmorphologywhichaffecttheirperformanceinapplication.PolymeradditiveswithcomplexfunctionshavebeenusedastemplatestodirectorientednucleationandgrowthofBaSO4(Xiaoetal.,2001;Yuetal.,2002;Summersetal.,2002),asanewclassoffunctionalpolymers,theso-calleddouble-hydrophilicblockcopolymers,designedtocontrolthemorphologyofBaSO4(Colfenetal.,2002),includingtheirnanofiberssynthesizedinAOTmicroemulsion(Li&Mann,2000).ThoughsomuchresearchhasbeendevotedtocontrollingtheBaSO4morphologies,thepresentnotewillreportonthesynthesisofBaSO4nanocrystalswithsizecontrolling.

简介：

简介：

简介：

简介：