Kev Sib Nqus: Kev Taw Qhia Txog Kev Paub Tag Nrho
Kev sib nqus yog ib qho xwm txheej ntuj tsim uas tau ua rau tib neeg xav tsis thoob txij li thaum ub los. Txhua yam los ntawm cov compasses thaum ub mus rau cov thev naus laus zis niaj hnub xws li MRI (Magnetic Resonance Imaging) cuam tshuam nrog cov ntsiab cai tseem ceeb ntawm kev sib nqus. Tsab xov xwm no yuav tshawb nrhiav cov ntsiab lus tseem ceeb ntawm kev sib nqus, cov hom hlau nplaum, lawv cov ntsiab cai ua haujlwm, thiab kev siv tau hauv lub neej txhua hnub thiab thev naus laus zis.
Kev Nkag Siab Yooj Yim ntawm Magnetism
Qhov tseem ceeb, kev sib nqus yog lub zog ntawm cov khoom siv los rub lossis thawb lwm cov khoom siv. Kev sib nqus yog tshwm sim los ntawm hluav taws xob lossis los ntawm qhov muaj lub zog sib nqus. Lub zog sib nqus yog thaj chaw nyob ib puag ncig lub zog sib nqus uas nws lub zog tuaj yeem hnov.
Tus kws tshawb fawb txog lub cev Hans Christian Ørsted yog ib tug ntawm cov kws tshawb fawb thawj zaug uas tau tshawb pom txog kev sib raug zoo ntawm hluav taws xob thiab magnetism hauv xyoo 1820. Ørsted tau tshawb pom tias qhov hluav taws xob ntws los ntawm ib txoj hlua ua rau lub koob compass uas nyob ze ntawm txoj hlua tig. Qhov kev tshawb pom no tau ua rau muaj kev txhim kho ntawm txoj kev xav ntawm electromagnetism.
Hom Hlau nplaum
1. Cov Hlau Nplaum Mus Ib Txhis thiab Ib Ntus
– Cov Hlau Nplaum Mus Ib Txhis: Cov hlau nplaum no tseem khaws lawv cov khoom sib nqus txawm tias tsis muaj lub zog sib nqus sab nraud. Cov piv txwv feem ntau yog cov hlau nplaum tuav thiab cov hlau nplaum nees.
– Cov Hlau Nplaum Ib Ntus: Cov hlau nplaum no tsuas yog qhia lawv cov khoom sib nqus thaum muab tso rau hauv lub zog sib nqus sab nraud. Lawv feem ntau yog ua los ntawm cov khoom siv ferromagnetic xws li hlau, uas poob lawv cov khoom sib nqus thaum lub zog sib nqus sab nraud raug tshem tawm.
2. Cov Hlau Nplaum Ntuj thiab Cov Hlau Nplaum Dag
– Cov Hlau Npib Ntuj: Cov hlau npib ntuj, xws li pob zeb lodestone, yog cov minerals uas muaj cov khoom sib nqus ntuj. Cov hlau npib no pom muaj nyob rau hauv xwm thiab tau siv txij li thaum ub los.
– Cov Hlau Nplaum Dag: Cov hlau nplaum dag yog ua los ntawm qee txoj kev, xws li txhuam hlau nrog lub hlau nplaum tas mus li lossis los ntawm kev xa hluav taws xob hla lub kauj hlau (solenoid).
3. Lub zog hluav taws xob
Lub hlau nplaum hluav taws xob yog ib hom hlau nplaum uas lub zog sib nqus tsim los ntawm kev ntws ntawm cov hluav taws xob. Lub zog sib nqus ploj mus thaum cov hluav taws xob raug nres. Cov hlau nplaum hluav taws xob muaj kev siv dav dav, suav nrog hauv cov cav hluav taws xob, cov tshuab hluav taws xob, thiab cov tshuab MRI scanners.
Cov Hlau Nplaum Ua Haujlwm Li Cas
Cov hlau nplaum ua haujlwm raws li lub hauv paus ntsiab lus ntawm kev rub thiab kev thawb ntawm cov ncej hlau nplaum. Ib lub hlau nplaum muaj ob lub ncej tseem ceeb: lub ncej sab qaum teb thiab lub ncej sab qab teb. Lub zog ntawm kev rub thiab kev thawb ntawm cov ncej no tuaj yeem sau ua ke raws li hauv qab no:
- Ib yam li cov Ncej Sib Nraus Ib Leeg: Cov Ncej Qaum Teb uas muaj cov ncej qaum teb lossis cov ncej qab teb uas muaj cov ncej qab teb yuav sib nraus ib leeg.
- Cov Ncej Sib Nraus Sib Nqus: Lub ncej qaum teb thiab lub ncej qab teb yuav sib nqus.
Qhov xwm txheej no yog tshwm sim los ntawm lub zog sib nqus uas tsim los ntawm kev txav mus los ntawm cov hluav taws xob hauv cov khoom siv. Cov hluav taws xob no muaj lub zog sib nqus uas tsim lub zog sib nqus.
Kev sib nqus hauv lub neej txhua hnub
Magnetism muaj ntau daim ntawv thov hauv lub neej txhua hnub:
1. Lub Compass
Lub compass yog ib lub cuab yeej yooj yim rau kev taug kev uas ua haujlwm raws li lub hauv paus ntsiab lus ntawm magnetism. Lub koob compass yog ib lub hlau nplaum me me, tig tau ywj pheej uas ib txwm taw rau lub ntiaj teb lub magnetic north pole, pab kev taug kev, tshwj xeeb tshaj yog rau cov neeg tsav nkoj thiab cov neeg tshawb nrhiav.
2. Cov Khoom Siv Hluav Taws Xob
Ntau yam khoom siv hluav taws xob, xws li cov hard drive hauv computer, siv lub hauv paus ntsiab lus ntawm magnetism los khaws cov ntaub ntawv. Cov ntaub ntawv khaws cia rau hauv daim ntawv ntawm cov bits, uas sawv cev los ntawm cov teb magnetic me me ntawm lub disk.
3. Cov Tsav Tsheb Hluav Taws Xob thiab Cov Generators
Cov tshuab hluav taws xob siv cov hlau nplaum hluav taws xob los hloov lub zog hluav taws xob mus ua lub zog tshuab. Ntawm qhov tod tes, cov tshuab hluav taws xob siv cov teb sib nqus los hloov lub zog tshuab mus ua lub zog hluav taws xob. Ob qho tib si yog qhov tseem ceeb rau lub neej niaj hnub no rau ob qho tib si hauv tsev thiab kev lag luam.
Cov Kev Siv Tshuab Sib Nqus
Magnetism kuj tseem ua lub luag haujlwm tseem ceeb hauv ntau yam thev naus laus zis siab heev:
1. Kev Siv Tshuab Xam Xaj Sib Nqus (MRI)
MRI yog ib txoj kev siv tshuab thaij duab kho mob uas tsis ua rau mob thiab siv lub zog sib nqus thiab cov nthwv dej xov tooj cua los tsim cov duab ntxaws ntxaws ntawm cov kabmob sab hauv. Cov thev naus laus zis no tseem ceeb heev rau kev kuaj mob vim nws tuaj yeem tsim cov duab zoo heev yam tsis tas yuav phais.
2. Kev Thauj Mus Los Ntawm Tsheb Ciav Hlau Maglev
Maglev, luv rau "magnetic levitation," yog ib txoj kev siv tshuab thauj mus los uas cov tsheb ciav hlau siv cov hlau nplaum muaj zog los tsa saum cov hlau ciav hlau, txo kev sib txhuam thiab cia lawv mus ncig tau sai heev. Cov tsheb ciav hlau Maglev twb khiav lag luam hauv ntau lub tebchaws lawm, suav nrog Nyiv Pooj thiab Suav teb.
3. Kev Khaws Cia Hluav Taws Xob
Cov hlau nplaum kuj tseem siv rau hauv cov khoom siv khaws cia lub zog xws li flywheels thiab cov roj teeb magnetoelectric. Flywheels siv lub zog ntawm cov teb magnetic los khaws lub zog kinetic, thaum cov roj teeb magnetoelectric siv cov ntsiab cai ntawm magnetism los ua kom muaj peev xwm khaws cia lub zog ntau dua.
Kev Sib Nqus Hauv Kev Tshawb Fawb thiab Kev Txhim Kho
Kev tshawb fawb hauv thaj chaw ntawm magnetism txuas ntxiv mus, ua rau muaj kev tsim kho tshiab thiab kev siv tshiab. Qee cov ncauj lus tshawb fawb tam sim no suav nrog:
1. Cov Khoom Siv Sib Nqus Tshiab
Cov kws tshawb nrhiav tseem niaj hnub nrhiav cov khoom siv sib nqus tshiab, ua haujlwm tau zoo dua thiab zoo rau ib puag ncig. Qee qhov kev tshawb fawb tsom mus rau kev tsim cov khoom siv hlau tsis tshua muaj uas muaj cov khoom sib nqus zoo dua.
2. Spintronics
Spintronics yog ib qho kev tshawb fawb uas kawm txog kev siv electron spin, ntxiv rau nws cov hluav taws xob, rau cov khoom siv nco thiab logic. Cov thev naus laus zis no tuaj yeem ua rau cov khoos phis tawj ceev dua thiab ua haujlwm tau zoo dua.
3. Magnetocaloric
Qhov cuam tshuam magnetocaloric yog ib qho xwm txheej uas cov khoom siv kub lossis txias thaum teb rau qhov hloov pauv ntawm lub zog sib nqus. Qhov no tuaj yeem muaj peev xwm siv rau hauv cov tshuab txias uas tsis ua rau ib puag ncig puas tsuaj.
Xaus
Kev sib nqus yog ib qho tseem ceeb uas muaj ntau yam kev siv, txij li lub neej txhua hnub mus txog rau thev naus laus zis siab heev. Peb txoj kev nkag siab txog kev sib nqus tau ua rau muaj kev tsim kho tshiab uas cuam tshuam rau yuav luag txhua yam ntawm lub neej niaj hnub no. Txij li cov compasses qub mus rau MRIs zoo heev, kev sib nqus tseem ua pov thawj nws tus kheej ua lub hauv paus tseem ceeb hauv physics thiab thev naus laus zis. Thaum kev tshawb fawb nce qib, peb tuaj yeem cia siab tias yuav muaj ntau daim ntawv thov hloov pauv los ntawm kev nkag siab tob txog kev sib nqus.
