Електромагнитен резонанс

Същност

Физически феномен

Определение

Whentheoscillatingcircuitisinanon-idealstateandthereisresistance,theresistanceheatsupandbecomesadampedoscillation;Whenthereisanexternalperiodicelectromotiveforceintheoscillationcircuit,itwillbecomeaforcedoscillation;whenthefrequencyoftheexternalelectromotiveforceisthesameasthenaturalfrequencyωofthefreeoscillationofthecircuit,theamplitudereachesthemaximumvalue,whichiscalledelectromagneticresonance.

Имоти

Whenthesystemisexcitedbytheoutsideandisforcedtovibrate,ifthefrequencyoftheexternalexcitationisclosetothesystemfrequency,theamplitudeoftheforcedvibrationmayreachaverylargevalue.Thisphenomenoniscalledresonance.Asystemhascountlessnaturalfrequencies,andweoftenstudylow-rangesystemfrequencies.

Electromagneticresonanceiselectromagneticresonancewhenthefrequencyofelectromagneticwaveisthesameasthenaturalfrequencyoftheoscillationcircuit

Медицински приложения

  • Magneticresonanceimaging(MRI),medicalimagingtechnologyElectromagnetic resonance

    • Functionalmagneticresonanceimaging(fMRI),MRItechnologytomeasurebrainactivity

    • Магнитно-резонансна неврология (MRN), MRI технологично изображение на нерв

    • CardiacMagneticResonanceImaging(CMR),MRItechnologytoassessthecardiovascularsystem

    • Magneticresonanceangiography(MRA),magneticresonanceimagingtechniqueimagebloodvessels

    • Magneticresonancecholangiopancreatography(MRCPexamination),MRItechnologyimagebiliarytractandpancreaticduct

    • EndorectalcoilMRIMRItechnology,imagetheareaaroundtherectum

    • DelayedGadoliniumEnhancedMagneticResonanceImagingCartilage(dGEMRIC)MagneticResonanceImagingTechnologyImageCartilage

    • MagneticResonanceElastography(AbsolutePen),MRItechnologytomeasuretissuestiffness

    • Interventionalmagneticresonanceimaging(Yes)UseMRItechnologytoguidemedicalinterventions

    • NMRspectroscopicimagingNMRResonancetechnology,collectingcellactivityandmetabolisminformation

  • Magneticresonancetherapy,proposingtheprincipleoftreatmentbasedonmagneticresonance

Спектроскопски приложения

  • NMRspectroscopy,atechniquetodeterminethepropertiesofphotonsormolecules

    • Two-dimensionalnuclearmagneticresonancespectroscopy

    • Протеини от спектроскопия на ядрено-магнитен резонанс

    • Carbohydratesofnuclearmagneticresonancespectroscopy

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    • Спектроскопия на ядрено-магнитен резонанс на нуклеинови киселини

    • Инвиво магнитно-резонансна спектроскопия

    • Ядрено-магнитно-резонансна спектроскопия в твърдо състояние

    • Triple-resonancenuclearmagneticresonancespectroscopy

    • ЯМР разединяване

    • ЯМР кристалография

  • Electronicparamagneticresonancespectroscopy,technologyandunpairedelectroniclearningmaterials

    • Импулсен електронен парамагнитен резонанс

Приложение на микроскоп

  • Magneticresonancemicroscope,nuclearmagneticresonancetechnologyisusedtothescaleof5-10cubicmicrons

  • Magneticresonanceforcemicroscope,nuclearmagneticresonanceimagingtechnologyisusedfornanometerandsmallerScale

Други употреби

  • Resonantinductivecoupling,amethodoftransmittingpower

  • ЯМР квантов компютър

  • Магнитен резонанс (дневник)

  • MagneticResonanceMedicine,"

  • MagneticResonanceinChemistry,"

  • MagneticResonanceCenterInvestigationInKingstonuponHull,England

  • TheIrvingL.HahnInstituteforMagneticResonanceImaginginEssen,Germany

  • Understandingthephysicalphenomenaofmagneticresonance(quantummechanics)

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