简介:摘要: 超声波无损探伤( NDI ),是超声无损检测技术的一种发展与应用,具有穿透能力强、设备简单、使用条件和安全性好、检测范围广等根本性的优点,加上压电复合材料、数字信息化处理技术和计算机模拟等高新技术的应用,检测设备由最初的模拟机,到现在应用最广的智能数字机,再到超声检测新宠相控阵设备,检测技术不断提高,工件内部缺陷的呈现形式越来越清晰、直观、精准。本文通过基础的 A 型脉冲波形显示检测原理,分析焊缝内部缺陷的超声检测技术要点。
简介:摘要:针对内屏蔽铁路数字信号电缆铜带纵包生产过程中出现的质量问题,结合对模具磨损照片和不合格品的分析,确定原铜带纵包模具的设计缺陷,并提出了改进方法;对改进后的模具进行了实际生产验证分析,结果表明,改进后的铜带纵包模具更有利于产品的实际生产,也有效了降低了内屏蔽铁路数字信号电缆高压击穿、绝缘电阻、对地电容不平衡、工作电容超差的问题。
简介:42-voltarchitectureonpowdermetallurgy-opportunities;AdesignmethodforsuperconductingMPdmagnetswithferromagneticmaterial;Afar-fieldapproximationforthefast-multipolemethodappliedtothecombinedfieldintegralequation;AflexibleandlowcostdesignforflybackAC/DCconverterwithharmoniccurrentcorrection;AgeneralizedEpsteintestmethodforthecomputationofcorelossesininductionmotors;ALearningObjectsApproachtoTeachingProgramming;
简介:(Ni,Fe,Co)-basednanocrystallinesoftmagnetswithnear-zeromagnetostriction;AccountingforResistivityandPermittivityinHighFrequencyPermeabilityMeasurements.ApplicationtoMnZnFerrites.;Biaxialmagnetometersensor;Biaxialmagnetometricsensor;DevelopmentofhighmagneticperformanceP/Msoftmagneticmaterial;FlexibleMagnetics:MagneticLithographyandFabricationofMagneticMasksonThinPlasticSubstrates;FormationandsoftmagneticpropertiesofFe-B-Si-Zrbulkglassyalloyswithhighsaturationmagnetizationabove1.5T;
简介:IdentifyingthePreisachfunctionforsoftmagneticmaterials,Influenceofgeometricalparametersofalayeredpowdercompositeonitsmagneticproperties,MagneticLithographyUsingFlexibleMagneticMasks:ApplicationstoServowriting,MultilayeredFeCo/FeCo-Osoftmagneticfilmsforrecordingapplications
简介:AWaveAbsorberforDSRCUsingResistiveFilmandMagneticMaterial,Activecurrenttransformercircuitsforsensingcurrentswithinmulti-kilowattpowerconvertersequippedwithactivepowerfactorcorrection,AnapplicationofSchur'slemmatoelasticdielectrics,Analysesandpreliminarytestsofabalsasandwichcorewithimprovedshearproperties,Behaviorofair-oxidationofthenucleargrade2-dimentionalcarbonfiberreinforcedcarboncomposite-ontheinterlayershearstrength,BoardLevelReliabilityEvaluationofRFPAModuleVias,Carbonfoam:anext-generationstructuralmaterial。
简介:Amagneto-hydrodynamicmicrofluidicnetwork,AmegahertzswitchingDC/DCconverterusingFeBNthinfilminductor,AMethodforOptimisingtheWeightandResponseofBrush-TypeWound-FieldDirectCurrentMotors,AnovelaccuratePEEC-based3DmodelingtechniqueforRFdevicesofarbitraryconductor-magnetstructure