Hnub ci yog ib qho hluav taws xob nthwv dej, muab faib ua lub teeb pom kev thiab pom tsis pom. Lub teeb pom kev yog hais txog qhov qhov muag liab qab pom, xws li lub teeb xya xim zaj sawv ntawm liab, txiv kab ntxwv, daj, ntsuab, xiav, indigo, thiab violet nyob rau hauv tshav ntuj; Lub teeb pom tsis tau yog hais txog qhov tsis tuaj yeem pom ntawm qhov muag liab qab, xws li ultraviolet, infrared, thiab lwm yam. Lub hnub ci peb feem ntau pom ntawm qhov muag liab qab yog dawb. Nws tau raug lees paub tias lub hnub ci dawb yog tsim los ntawm xya xim ntawm lub teeb pom kev thiab pom tsis pom ntawm ultraviolet rays, X-rays, α, β, γ, infrared rays, microwaves thiab tshaj tawm tsis tau. Txhua lub hnub ci muaj zog sib txawv thiab lub cev muaj zog. Tam sim no, nyob zoo cov neeg nyeem, thov ua raws li tus sau los tham txog lub teeb ultraviolet.
Raws li qhov sib txawv ntawm cov teebmeem lom neeg, cov kab hluav taws xob ultraviolet tau muab faib ua plaub pawg raws li lub wavelength: ntev-yoj UVA, nruab nrab-yoj UVB, luv-yoj UVC, thiab lub tshuab nqus tsev vacuum UVD. Qhov ntev ntawm lub wavelength, lub zog muaj peev xwm nkag mus.
Ntev-yoj UVA, nrog lub wavelength ntawm 320 mus rau 400 nm, kuj hu ua ntev-yoj tsaus ntuj nti nyhuv ultraviolet lub teeb. Nws muaj zog nkag mus rau hauv iav thiab txawm tias 9 feet ntawm dej; Nws tshwm sim txhua xyoo puag ncig, tsis hais nws yog huab lossis tshav ntuj, nruab hnub lossis hmo ntuj.
Ntau tshaj 95% ntawm cov kab hluav taws xob ultraviolet uas peb cov tawv nqaij tuaj yeem tiv nrog txhua hnub yog UVA. UVA tuaj yeem nkag mus rau hauv cov epidermis thiab tua cov dermis, ua rau muaj kev puas tsuaj loj rau collagen thiab elastin hauv daim tawv nqaij. Ntxiv mus, dermal hlwb muaj peev xwm tiv thaiv tus kheej tsis zoo, yog li qhov tsawg heev ntawm UVA tuaj yeem ua rau muaj kev puas tsuaj loj. Thaum lub sij hawm, cov teeb meem xws li daim tawv nqaij sagging, wrinkles, thiab tshwm sim ntawm capillaries.
Nyob rau tib lub sijhawm, nws tuaj yeem ua rau tyrosinase, ua rau melanin deposition tam sim ntawd thiab tsim melanin tshiab, ua rau daim tawv nqaij tsaus thiab tsis muaj luster. UVA tuaj yeem ua rau lub sijhawm ntev, ntev thiab ntev kev puas tsuaj thiab kev laus ntxov ntawm daim tawv nqaij, yog li nws tseem hu ua aging rays. Yog li ntawd, UVA kuj yog lub wavelength uas ua phem tshaj plaws rau daim tawv nqaij.
Txhua yam muaj ob sab. Los ntawm lwm qhov kev xav, UVA muaj nws cov txiaj ntsig zoo. UVA ultraviolet rays nrog lub wavelength ntawm 360nm ua raws li phototaxis teb nkhaus ntawm kab thiab tuaj yeem siv los ua kab kab. UVA ultraviolet rays nrog lub wavelength ntawm 300-420nm tuaj yeem dhau los ntawm cov iav tinted tshwj xeeb uas txiav tag nrho cov teeb pom kev zoo, thiab tsuas yog radiate ze-ultraviolet lub teeb nruab nrab ntawm 365nm. Nws tuaj yeem siv rau hauv kev txheeb xyuas ore, theem kho kom zoo nkauj, tshuaj xyuas nyiaj txiag thiab lwm qhov chaw.
Nruab nrab yoj UVB, wavelength 275 ~ 320nm, tseem hu ua nruab nrab yoj erythema nyhuv ultraviolet lub teeb. Piv nrog UVA qhov nkag mus, nws suav tias yog nruab nrab. Nws luv luv wavelength yuav absorbed los ntawm pob tshab iav. Feem ntau ntawm cov nruab nrab-yoj ultraviolet lub teeb muaj nyob rau hauv tshav ntuj yog absorbed los ntawm ozone txheej. Tsuas yog tsawg dua 2% tuaj yeem ncav cuag lub ntiaj teb nto. Nws yuav muaj zog tshwj xeeb thaum lub caij ntuj sov thiab yav tav su.
Zoo li UVA, nws tseem yuav oxidize tiv thaiv lipid txheej ntawm epidermis, ziab tawm ntawm daim tawv nqaij; Ntxiv mus, nws yuav denature nucleic acids thiab proteins nyob rau hauv lub epidermal hlwb, ua rau cov tsos mob xws li mob dermatitis (ie, sunburn), thiab daim tawv nqaij yuav tig liab. , mob. Hauv qhov xwm txheej hnyav, xws li raug lub hnub ntev, nws tuaj yeem ua rau mob qog noj ntshav tau yooj yim. Tsis tas li ntawd, kev puas tsuaj mus sij hawm ntev los ntawm UVB tuaj yeem ua rau muaj kev hloov pauv hauv melanocytes, ua rau lub hnub me me uas nyuaj rau tshem tawm.
Txawm li cas los xij, tib neeg tau tshawb pom los ntawm kev tshawb fawb tshawb fawb tias UVB kuj tseem muaj txiaj ntsig. Ultraviolet kev saib xyuas kev noj qab haus huv teeb thiab cov nroj tsuag loj hlob teeb yog ua los ntawm cov pob tshab ntshiab ntshav iav (uas tsis xa lub teeb hauv qab 254nm) thiab phosphors nrog lub ncov tus nqi ze 300nm.
Luv-yoj UVC, nrog lub wavelength ntawm 200 ~ 275nm, tseem hu ua luv-yoj sterilizing ultraviolet lub teeb. Nws muaj peev xwm nkag mus tsis muaj zog tshaj plaws thiab tsis tuaj yeem nkag mus rau feem ntau pob tshab iav thiab yas. Txawm tias ib daim ntawv nyias tuaj yeem thaiv nws. Lub luv-yoj ultraviolet rays uas muaj nyob rau hauv tshav ntuj yog yuav luag tag absorbed los ntawm ozone txheej ua ntej mus txog hauv av.
Txawm hais tias UVC nyob rau hauv qhov yog absorbed los ntawm ozone txheej ua ntej mus txog hauv av, nws cov kev cuam tshuam ntawm daim tawv nqaij yog negligible, tab sis luv luv-yoj ultraviolet rays tsis tuaj yeem ncaj qha irradiate tib neeg lub cev. Yog tias raug pom ncaj qha, daim tawv nqaij yuav raug kub hnyiab hauv lub sijhawm luv luv, thiab qhov ntev los yog siv zog heev tuaj yeem ua rau mob qog noj ntshav.
Cov teebmeem ntawm ultraviolet rays hauv UVC band yog qhov dav heev. Piv txwv li: UV germicidal teeb emit UVC luv-yoj ultraviolet rays. Short-wave UV yog dav siv nyob rau hauv tsev kho mob, cua txias tshuab, tshuaj tua kab mob, khoom siv kho mob, dej haus, dej phwj kho nroj tsuag, pas dej ua ke, khoom noj khoom haus thiab dej haus ua thiab ntim khoom, khoom noj khoom haus factories, tshuaj pleev ib ce factories, mis nyuj factories, breweries, dej haus factories, Cov cheeb tsam xws li bakeries thiab chav txias cia.
Hauv cov ntsiab lus, qhov zoo ntawm lub teeb ultraviolet yog: 1. Kev tua kab mob thiab ua kom tsis muaj menyuam; 2. Txhawb kev txhim kho pob txha; 3. Zoo rau cov ntshav xim; 4. Qee zaus, nws tuaj yeem kho qee yam kab mob ntawm daim tawv nqaij; 5. Nws tuaj yeem txhawb cov metabolism hauv cov ntxhia thiab tsim cov vitamin D hauv lub cev; 6., txhawb cov nroj tsuag kev loj hlob, thiab lwm yam.
Qhov tsis zoo ntawm cov hluav taws xob ultraviolet yog: 1. Kev raug ncaj qha yuav ua rau tawv nqaij laus thiab wrinkles; 2. daim tawv nqaij; 3. Cov kab mob dermatitis; 4. Lub sij hawm ntev thiab loj ntawm qhov raug ncaj qha tuaj yeem ua rau mob qog noj ntshav.
Yuav ua li cas kom tsis txhob raug mob ntawm UVC ultraviolet rays rau tib neeg lub cev? Txij li UVC ultraviolet rays muaj qhov tsis muaj zog nkag mus, lawv tuaj yeem raug thaiv tag nrho los ntawm cov iav pob tshab, khaub ncaws, yas, plua plav, thiab lwm yam. Yog li ntawd, los ntawm kev hnav tsom iav (yog tias koj tsis muaj tsom iav, tsis txhob saib ncaj qha ntawm lub teeb UV) thiab npog koj cov tawv nqaij nrog cov khaub ncaws ntau li ntau tau, koj tuaj yeem tiv thaiv koj ob lub qhov muag thiab tawv nqaij los ntawm UV
Nws yog ib qho tsim nyog hais tias qhov luv luv raug rau ultraviolet rays zoo li raug rau lub hnub ci ntsa iab. Nws tsis ua mob rau tib neeg lub cev tab sis muaj txiaj ntsig zoo. UVB ultraviolet rays tuaj yeem txhawb cov mineral metabolism thiab tsim cov vitamin D hauv lub cev.
Thaum kawg, lub tshuab nqus tsev yoj UVD muaj lub wavelength ntawm 100-200nm, uas tsuas tuaj yeem nthuav tawm hauv lub tshuab nqus tsev thiab muaj peev xwm nkag mus tsis zoo. Nws tuaj yeem oxidize oxygen hauv huab cua mus rau hauv ozone, hu ua ozone tiam kab, uas tsis muaj nyob hauv ib puag ncig ntuj uas tib neeg nyob.
Post lub sij hawm: May-22-2024