简介:Lattice,magneticandorbitalstructuresinKCuF3areself-consistentlydeterminedbyourclusterself-consistentfieldapproachbasedonaspin-orbital-latticeHamiltonian.Twostablestructuresareobtainedandfoundtobedegenerate,whichconfirmsthepresenceofthecoexistentphasesobservedexperimentally.Weclearlyshowthatduetotheinherentfrustration,thegroundstateofthesystemonlywiththesuperexchangeinteractionisdegenerate;whiletheJahn-Tellerdistortion,especiallytheanharmoniceffect,stabilizestheorbitalorderedphaseatabout23%inthex2-y2orbitandat77%inthe3z2-r2orbit.MeanwhilethemagneticmomentofCuisconsiderablyreducedto0.56μB,andmagneticcouplingstrengthsarehighlyanisotropic,Jz/Jxy≈18.Theseresultsareingoodagreementwiththeexperiments,implyingthattheanharmonicJahn-TellereffectplaysanessentialroleinstabilisingtheorbitalorderedgroundstateofKCuF3.
简介:磁性的元素Fe,公司和Ni的线性热扩大(CLE)的系数用与MATLAB计算相结合的理论模型从试验性的信息被估计。模型参数能精确地被决定,并且估计的数据在对试验性的结果的好同意。便于评价,热扩大的理论被使用把CLE分开成它的无磁性、磁性的部件。对CLE的无磁性的贡献的计算基于MnBi/NdFeB混血儿的修改Grc性质结合的磁铁都逐渐地减少,当混合磁铁的密度几乎线性地改善时。在293-398的一个温度范围?K,混合磁铁的coercivity温度系数从0.59逐渐地改善?%比较。建模和频率与二低角落频率认为压力消除阀门是一个秒顺序系统是合理的试验性的结果表演。PID控制,死了的乐队赔偿控制和鷸?鷸??
简介:AZ31镁合金的团结的微观结构上的一个搏动的磁场的效果被调查。当搏动的磁场被用于AZ31合金的团结时,试验性的结果证明显著微结构精炼被完成。AZ31合金的当演员组微观结构的平均谷物尺寸被精制到107m。由熄灭AZ31合金,不同主要-Mg微观结构在团结的功课期间被保存。微观结构进化表明主要-Mg与搏动的磁场在球状的形状产生并且成长,有没有搏动的磁场的树枝状的形状的对比。搏动的磁场原因在团结期间融化传送对流,它做全部的温度融化一致,并且在液体/固体接口前面生产一个undercooling地区,它使成核率增加并且禁止的大树突。另外,在melt导致的朱尔热效果也加强谷物精炼效果和树突手臂的spheroidization。
简介:ARogowskicoilisdevelopedtodetectthenanosecondpulsesignalsofthedischargecurrentwithawidebandwidthof800kHzto106MHzandhighsensitivityof2.22V/A.Perfor-mancetestsshowthattheRogowskicoilhasbothexcellentdynamicandstaticcharacteristics.CalibratingresultsandthecomparisonbetweenthestandardcurrentshuntandthedevelopedRo-gowskicoilforthemeasurementofnanoseconddischargepulsesdemonstratethatthedevelopedRogowskicoilcanreproducetheactualwaveformofthedischargecurrentaccurately.
简介:
简介:AIM:Todeterminetheclinicalvalueofdiffusion-weight-edimaging(DWI)forthediagnosisofextrahepaticcholangiocarcinoma(EHCC)bycomparingthediagnosticsensitivityofDWIandmagneticresonancecholan-giopancreatography(MRCP).METHODS:Magneticresonanceimagingexaminationwasperformedin56patientswithsuspectedEHCC.T1-weightedimaging,T2-weightedimaging,MRCPandDWIsequence,DWIusingsingle-shotspin-echoechoplanarimagingsequencewithdifferentbvalues(100,300,500,800and1000s/mm2),wereperformed.Allcaseswerefurtherconfirmedbysurgeryorhistopathologicaldiagnosis.TworadiologistsjointlyperformedtheanalysisoftheDWIandMRCPimages.Apparentdiffusioncoefficient(ADC)valueandsignal-noiseratiowerecalculatedforEHCC.Sensitivity,specificity,accuracy,positivepredictivevalueandnegativepredictivevalueweretestedusingDWIwithabvalueof500s/mm2andMRCPimages,respectively.RESULTS:Histopathologicaldiagnosisconfirmedthatamongthe56cases,35wereEHCC(20hilarand15distalextrahepatic),16werecholangitis,and5werecal-culusofbileduct.Thirty-threeoutofthe35EHCCcasesweredetectedbyDWI.EHCCexhibiteddifferentiallevelsofhighsignalintensityinDWIandlowsignalintensityintheADCmap.ThemeanvalueforADCwas(1.31±0.29)×10-3mm2/s.ThedetectionrateofEHCCwassignificantlyhigherbyDWI(94.3%)thanbyMRCP(74.3%)(P<0.05).Therewasasignificantdifferenceinsensitivity(94.3%vs74.3%),specificity(100%vs71.4%),accu-racy(96.4%vs73.2%),positivepredictivevalue(100%vs81.3%),andnegativepredictivevalue(91.3%vs62.5%)betweenDWIandMRCPindiagnosingEHCC.CONCLUSION:DWIhasahighsensitivityforthedetectionofEHCCasitshowstheEHCClesionmoreunambiguouslythanMRCPdoes.DWIcanalsoprovideadditionalclinicallyimportantinformationinEHCCpatientswhenaddedtoroutinebileductMRimagingprotocols.
简介:[埃及土人_(1.5nm)/ZrO_(2xnm)]_(10)多层的电影被磁控管劈啪作响在玻璃底层上扔然后为30min在600℃在真空退火了。他们的结构和磁性作为ZrO_2内容的功能被调查。结果证明谷物尺寸和coercivity首先随ZrO_2内容的增加增加然后减少。Themaximumcoercivity和谷物尺寸在ZrO_2的37vol.%被获得。在这部电影的ZrO_2的内容在埃及土人谷物的分离并且在intergrainexchange相互作用的减小起一个重要作用。根据尖依赖coercivity的研究,埃及土人的磁化颠倒拍摄与,这被发现(111)质地与领域墙运动或旋转模式的S-W类型不同。
简介:Epoxyresinlaminateontowhichapairofcopperfoilwasprintedwasemployedastestsamples.Thesampleswereplacedinanartificialatmosphericchamber,whichwasvacuumedbyarotarypumpfrom100kPato5kPa.ThemagneticfieldwasproducedbypermanentmagnetsthatwereassembledtomakeE×Bdriftawayfrom,intoandparalleltothesamplesurface,respectively.Magneticfluxdensitywasadjustedat120mT,180mTand240mTrespectively.Byapplyinganegativebiasvoltagebetweentheelectrodes,the...
简介:
简介:Numericalandanalyticalresultsarepresentedforthemagneticorderinginabond-dilutedspin-1/2andspin-1mixedtransverseIsingsystemwithasingle-ionanisotropyonahoneycomblattice.Specialemphsisisplacedonthemagneticorderingunderthebonddilutionandpercolationthreshold.Wediscussindetailtheinfluenceoftransversefieldsofdifferentsublatticsonthenormalmagneticorderingandonthemagneticorderinginducedbysingle-lonanisotropy.Wefindthatthemagneticorderingofasystemexhibitsanexplicitdifferencewhenreceivingthetransversefield.Thisphenomenonhasnotbeenrevealedinpreviousreports.