简介：EffectofMnsubstitutionforFeincubicLavesZr0.1Tb0.9(Fe1-xMnx)2andY0.1Tb0.9(Fe1-xMnx)2com-poundsispresented.Similarresultsinbothsystemsareobtained:ThestructureandthemagnetismofTbFe2arebothinfluencedslightlybyasmallamountofYorZrsubstitutionforTb;Withincreasingxvalue,thelatticeconstantincreasesmonotonously;theCurietemperaturedecreaseslinearly;whilesaturationmagnetizationincreaseslinearly.ForthesmallamountofMnsubstitutionforFeinbothsystems,magnetostrictionissignificantlylargerthanthatinthepureironalloys.Thelargestmagnetostrictionof|γ‖-|γ|=2200×10-6atmagneticfieldof2×107/4πA/misobtainedforY0.1Tb0.9(Fe0.95Mn0.052.

简介：Anewμ3-Otriiron（Ⅲ）complex[Fe3O（OBz）6（CH3OH）3]（NO3）（CH3OH）2（HOBZ=benzoicacid）hasbeensynthesized,itsstructurehasbeendeterminedandvariabletemperaturemagneticsusceptilityhasalsobeenmeasured.Inthemolecule,threeironatomsformedanequilateraltrianglewithu3-Oincenter.ThefittingtothemagneticsusceptibilityshowedthatanintramolecularantiferromagneticexchangeinteractionoccurredbetweenironatomswithJ=-25.51cm-1,andaweakerintermolecularantiferromagneticexchangeinteractionoccurredwithzJ’=-2.30cm-1.

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简介：NanocrystallineNi1?有0的xZnxFe2O4铁酸盐?x?1被一个水花一起沉淀方法成功地准备。微观结构被使用XRD和TEM调查。磁性与颤动被测量在房间温度的样品磁强计(VSM)。结果证明谷物nanocrystalline缩放Ni1?在600点锻烧的xZnxFe2O4铁酸盐?祥獥Δ

简介：PolycrystallinesBi0.5Ca0.5–xLaxFe0.3Mn0.7O3(x=0,0.05,0.10,0.15,0.20,0.25)werepreparedbymoltensaltmethodandshowedperovskiteorthorhombicstructurewithspacegroupPnma.Themagneticmeasurementsindicatethatthecompoundsexhibitantiferromagneticbehaviorinatemperaturerangeof4―300K.ThemeasurementsoftransportpropertiessuggestthatthesubstitutionofLaforCaenhancedtheconductivity,andakinkappearedonthecurveoftemperaturedependenceofresistivityat275K,whichisrelatedtothespin-reorientationinthesamples.

简介：BACKGROUND:Functionalmagneticresonanceimaging(fMRI)isinitiallyusedforvisualcortexlocation.However,theapplicationoffMRIininvestigatingthedevelopmentofvisualpathwaylesionsneedstobefurtherobserved.OBJECTIVE:Thisstudyistolongitudiallyobservethedynamicchangesincorticalfunctionandwhitematterfibrousstructureofpatientswithvisualpathwaylesionsbybloodoxygenationleveldependent-functionalmagneticresonanceimaging(BOLD-fMRI)combinedwithdiffusiontensorimaging(DTI),andtoanalyzethecharacteristicsofbrainfunctionandstructuralrecombinationatconvalescentperiodoflesions.DESIGN:Randomizedcontrolledobservation.SETTING:DepartmentofRadiology,theGeneralHospitalofNanjingMilitaryAreaCommandofChinesePLA.PARTICIPANTS:Eightpatientswithunilateralorbilateralvisualdisordercausedbyvisualpathwaylesions,whoadmittedtoDepartmentofRadiology,theGeneralHospitalofNanjingMilitaryAreaCommandofChinesePLAfromJanuarytoSeptember2006wereinvolved,andservedasexperimentalsubjects.Thepatients,6malesand2females,wereaged16-67years.Theyhadvisualdisorderconfirmedbyclinicalexamination,i.e.visualpathwaylesion,whichwasfurtherdiagnosedbyMRorCT.Another12subjectsgenerallymatchingtothosepatientsofexperimentalgroupingender,ageandsight,whoreceivedhealthexaminationinsynchronizationwereinvolvedandservedascontrols.Thesubjectshadnohistoryofeyediseases.Theirbinocularvisualacuity(orcorrectedvisualacuity)wasover1.0.Bothroutineexaminationofophthalmologyandexaminationoffunduswerenormal.Informedconsentsofdetecteditemswereobtainedfromallthesubjects.METHODS:SignaExciteHD1.5Tmagneticresonanceimagingsystemwith16passages(GECompany,USA)andcoilwith8passageswereused;brainfunctionalstimulusapparatus(SAV-8800.MeideCompany)wasusedforshowingexperimentalmission.Attheearlystageandconvalescentperiodoflesions,thepatie

简介：PureAl2O3-2SiO2powderswerepreparedbysol-gelandcoprecipitationmethods,andtheiralkaliactivationreactivitieswerecompared.Thealkali-activationreactivityofthepowderpreparedbythesol-gelmethodwashigherthanthatofthepowderpreparedbythecoprecipitationmethod.Thepowderswereinvestigatedby27AIand29Simagic-anglespinningnuclearmagneticresonancespectroscopy（MASNMR）tounderstandtherelationshipbetweentheirstructureandalkali-activationreactivity.The27AlMASNMRdatashowedthatthefive-coordinateAIcontentofthepowderpreparedbythesol-gelmethodwashigherthanthatofthepowderpreparedbycoprecipitation.Thehighercontentoffive-coordinateAlcorrespondedtohigheralkali-activationreactivity.The29SiMASNMRdatashowedthatforthepowderpreparedbythesol-gelmethod,siliconwasreplacedbyaluminumatsecondarycoordinationsitesofthecentralSiatomsduringcalcination.However,forthepowderpreparedbysingle-batchcoprecipitation,themainchangewasfromalowdegreeofpolycondensationtoahighdegreeofpolycondensation.