Sähkömagneettinen resonanssi

Essence

Epäfyysinen ilmiö

Määritelmä

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

Ominaisuudet

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

Electromagneticresonanceiselectromagneticresonancewhenthefrequencyofelectromagneticwaveisthesameasthenaturalfrequencyoftheoscillationcircuit

Lääketieteelliset sovellukset

  • Magneticresonanceimaging(MRI),medicalimagingtechnologyElectromagnetic resonance

    • Functionalmagneticresonanceimaging(fMRI),MRItechnologytomeasurebrainactivity

    • Magneettinen resonanssineurologia (MRN), MRI-teknologiankuva

    • CardiacMagneticResonanceImaging(CMR),MRItechnologytoassessthecardiovascularsystem

    • Magneticresonanceangiography(MRA),magneticresonanceimagingtechniqueimagebloodvessels

    • Magneticresonancecholangiopancreatography(MRCPexamination),MRItechnologyimagebiliarytractandpancreaticduct

    • EndorectalcoilMRIMRItechnology,imagetheareaaroundtherectum

    • DelayedGadoliniumEnhancedMagneticResonanceImagingCartilage(dGEMRIC)MagneticResonanceImagingTechnologyImageCartilage

    • MagneticResonanceElastography(AbsolutePen),MRItechnologytomeasuretissuestiffness

    • Interventionalmagneticresonanceimaging(Yes)UseMRItechnologytoguidemedicalinterventions

    • NMRspectroscopicimagingNMRResonancetechnology,collectingcellactivityandmetabolisminformation

  • Magneticresonancetherapy,proposingtheprincipleoftreatmentbasedonmagneticresonance

Spektroskopiasovellukset

  • NMRspectroscopy,atechniquetodeterminethepropertiesofphotonsormolecules

    • Two-dimensionalnuclearmagneticresonancespectroscopy

    • Ydinmagneettikresonanssispektroskopian proteiinit

    • Carbohydratesofnuclearmagneticresonancespectroscopy

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    • Nukleiinihappojen ydinmagneettikresonanssispektroskopia

    • Invivomagneettikresonanssispektroskopia

    • Puolijohdeydinmagneettikresonanssispektroskopia

    • Triple-resonancenuclearmagneticresonancespectroscopy

    • NMR-irrotus

    • NMR-kristallografia

  • Electronicparamagneticresonancespectroscopy,technologyandunpairedelectroniclearningmaterials

    • Pulssielektroniparamagneettinen resonanssi

Mikroskooppisovellus

  • Magneticresonancemicroscope,nuclearmagneticresonancetechnologyisusedtothescaleof5-10cubicmicrons

  • Magneticresonanceforcemicroscope,nuclearmagneticresonanceimagingtechnologyisusedfornanometerandsmallerScale

Muut käyttötarkoitukset

  • Resonantinductivecoupling,amethodoftransmittingpower

  • NMR-kvanttitietokone

  • Magneettiresonanssikuvaus (lehti)

  • MagneticResonanceMedicine,"

  • MagneticResonanceinChemistry,"

  • MagneticResonanceCenterInvestigationInKingstonuponHull,England

  • TheIrvingL.HahnInstituteforMagneticResonanceImaginginEssen,Germany

  • Understandingthephysicalphenomenaofmagneticresonance(quantummechanics)

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