简介：Intheterahertz(THz)band,theinherentshakeofthehumanbodymaystronglyimpairtheimagequalityofabeamscanningsinglefrequencyholographysystemforpersonnelscreening.Torealizeaccurateshakecompensationinimagingprocessing,itisquitenecessarytodevelopahigh-precisionmeasuresystem.However,inmanycases,differentpartsofahumanbodymayshaketodifferentextents,resultingingreatlyincreasingthedifficultyinconductingareasonablemeasurementofbodyshakeerrorsforimagereconstruction.Inthispaper,abodyshakeerrorcompensationalgorithmbasedontherawdataisproposed.Toanalyzetheeffectofthebodyshakeontherawdata,amodelofechoedsignalisrebuiltwithconsideringboththebeamscanningmodeandthebodyshake.Accordingtotherebuiltsignalmodel,wederivethebodyshakeerrorestimatedmethodtocompensateforthephaseerror.Simulationonthereconstructionofpointtargetswithshakeerrorsandproof-of-principleexperimentsonthehumanbodyinthe0.2-THzbandarebothperformedtoconfirmtheeffectivenessofthebodyshakecompensationalgorithmproposed.

简介：Toreducemechanicalvibrationsinducedbybigerrorscompensation,anewsoftwarecompensationmethodbasedonanimproveddigitaldifferentialanalyzer(DDA)interpolatorforstaticandquasi-staticerrorsofmachinetoolsisproposed.BasedonprincipleoftraditionalDDAinterpolator,aDDAinterpolatorisdividedintocommandgeneratorandcommandanalyzer.Therearethreetypesoferrors,consideringthedifferenceofpositionsbetweencompensationpointsandinterpolationsegments.Accordingtotheclassification,errorsaredistributedevenlyindataprocessingandcompensatedtocertaininterpolationsegmentsinmachining.On-lineimplementationresultsshowthattheproposedapproachgreatlyimprovespositioningaccuracyofcomputernumericalcontrol(CNC)machinetools.

简介：Inourexperiments,westudiedthecommercialSingleLevelCell(SLC)NANDFlashdevicesmanufacturedbyMicronTechnology.ThememorieswereirradiatedattheHeavyIonResearchFacilityinLanzhou(HIRFL)intheInstituteofModernPhysics(IMP),ChineseAcademyofSciences(CAS).Weusedtwokindsofheavyions(86Krand209Bi)toirradiatetheFlashmemoriesandthedegraderswithdifferentthicknesswereusedtogetthedifferentLETofions.Allthetestswerecarriedoutinairatroomtemperaturewithnormalincidentbeam.