简介:利用改进的Preisach-DOK模型模拟得到了纵向钡铁硬磁盘及γ-Fe2O3软盘的Henkel曲线和Δm曲线.研究发现钡铁氧体粒子之间具有很强的“正”相互作用,起到了阻止退磁的作用,说明钡铁氧体具有较好的剩磁特性.
简介:Astudyoftheconnectionmechanismofcast-inhighchromiumcastiron-carboncaststeelbycast-inprocess,AstudyonthegrindabilityofniobiummicroalloyedforgingqualityHSLAsteels,Accuratemeasurementmethodofamplitudeandphasepatternforportabletelephone,AccuratepredictionofferritecorelosswithnonsinusoidalwaveformsusingonlySteinmetzparameters,Accuratepredictionofhigh-frequencypower-transformerlossesandtemperaturerise。
简介:Amodelofspinwaveresonanceingrain-surface-layersforeffectivelinewidthandchannelsofenergytransferonpolycrystals,ANEWMETHODOFDETERMINATIONOFOXYGENDIFFUSIVITIESINPOLYCRYSTALLINEFERRITEANDITSVERIFICATIONBYANUCLEARMICROANALYSISMETHOD,Anewsimulationtoolforthecalculationofcarbonconcentration-distancecurves-predictionandanalysisofcarburizationanddecarburizationprofiles
简介:2-Dvs.s-Dmodelstopredictequivalentcircuitparametersforhighfrequencytransformers;780N/mm{sup}2gradehot-rolledhigh-strengthsteelsheetforautomotivesuspensionsystem;Acompact2-DFDTDalgorithmfortheanalysisofnonreciprocalfcrritcphaseshifters;Afacilityforprobemeasurementsofthedispersioncharacteristicsofpolycrystallineferriteplates;Agrainsizedependenceofacreepdeformationoftungstencontaininghighchromiumferriticcreepresistantsteel;AMAGNETICMETHODINTHETESTINGOFFERROMAGNETICMATERIALS;
简介:目的:研究硫酸钡改性纤维桩与3种树脂核材料的微拉伸粘接强度。方法:自研制硫酸钡改性玻璃纤维桩(JFiber-post,JFP)与商品纤维桩(DTLightpost,LP)各12根,随机分成3组。桩周分别用2种双固化树脂ClearfilDCcore(CD),RebildaDC(RD)与光固化树脂/粘接剂:Z100Restorative/AdperPrompt(ZR)进行充填。低速锯沿纤维桩外周平行片切,再垂直粘接面片切成1±0.1mm2的柱状试件用于微拉伸强度测试,并对断裂面进行光镜及扫面电镜观察。结果:两种纤维桩与3种核材料的粘接强度相近。JFP-ZR组粘接强度为7.481±1.607MPa显著高于LP-ZR组5.848±2.114MPa(P〈0.05)。结论:硫酸钡改性纤维桩与树脂核的微拉伸粘接强度与商品纤维桩相当,满足临床需要。
简介:采用溶胶-凝胶法制备了立方晶系尖晶石型镍基铁氧体微粉Ni0.5M0.5Fe2O4(M=Zn、Mn、Cu),采用X射线衍射仪、扫描电子显微镜、振动样品磁强计和矢量网络分析仪对粉末的结构、形貌、磁性以及电磁性能进行了表征,结果表明,三种粉末在室温下具有超顺磁性,其饱和磁化强度MS分别为76.0、59.4和54.4emu·g-1。在2—11GHz范围内,Ni0.5M0.5Fe2O4的电磁损耗角正切值tgδ随频率的增大而逐渐减小;Ni0.5M0.5Fe2O4和Ni0.5M0.5Fe2O4的tgδ随频率的增大先增大后减小。