2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub ntsej muag ntawm lub cev dub zoo meej (nrog rau qhov emissivity ntawm 1) emits thermal tawg ntawm tus nqi kwv yees li 448 watts ib square meter ntawm chav tsev kub (25 ° C, 298.15 K); Tag nrho cov khoom tiag tiag muaj emissivities tsawg dua 1.0, thiab emit hluav taws xob ntawm tus nqi qis dua.
Dab tsi yog qhov emissivity ntawm lub cev dub?
Emissivity txhais tau tias yog qhov sib piv ntawm lub zog hluav taws xob los ntawm qhov chaw ntawm cov khoom mus rau qhov uas tau tawg los ntawm lub emitter zoo meej, hu ua lub cev dub, ntawm qhov kub thiab qhov ntev. Ib tug dub muaj ib tug emissivity ntawm 1.
Tus nqi ntawm emissivity rau lub cev dub zoo meej yog dab tsi?
Cov hluav taws xob cua sov yog cov hluav taws xob infrared uas tuaj yeem suav nrog ob qho tib si pom hluav taws xob thiab hluav taws xob infrared. Quantitatively, emissivity yog qhov piv ntawm thermal hluav taws xob los ntawm ib qho chaw rau cov hluav taws xob ntawm qhov zoo tshaj plaws dub ntawm tib qhov kub. Emissivity ntawm lub cev dub zoo kawg nkaus yog 1.
Lub cev dub zoo li cas?
: lub cev zoo tshaj plaws lossis qhov chaw uas nqus tag nrho lub zog hluav taws xob poob rau ntawm nws yam tsis muaj kev xav thiab qhov ntawd radiates ntawm txhua zaus nrog lub zog spectral faib nyob ntawm nws qhov kub thiab txias.
Vim li cas lub emissivity ntawm lub cev dub sib npaug?
Cov hluav taws xob spectrum ntawm tus neeg tawv dub lub ntsej muag ua raws Planck txoj cai tag nrho, yog li nws cov emissivity monochromaticyog ib txwm 1. Tsis tas li ntawd, blackbody hluav taws xob faib nyob rau hauv txhua txoj kev yog ib yam, ua raws Lambert txoj cai kiag li.
Pom zoo:
Ua txhua yam zoo kawg nkaus li rau tus tswv?
[23] Thiab txhua yam uas nej ua, ua nws siab kawg ntsws, ib yam li tus Tswv, tsis yog rau tib neeg; [24] Paub tias ntawm tus Tswv nej yuav tsum tau txais nqi zog ntawm cov qub txeeg qub teg: rau koj ua hauj lwm rau tus Tswv Khetos.
Leej twg cov lus qhia ua kom lub cev yam tsawg kawg nkaus?
yuav tsum ua yam tsawg kawg 150–300 feeb ntawm kev siv zog ua haujlwm aerobic lub cev; los yog tsawg kawg 75-150 feeb ntawm kev siv zog ua haujlwm aerobic lub cev; los yog ib qho sib npaug ntawm kev ua haujlwm nruab nrab- thiab muaj zog-siv thoob plaws lub asthiv.
Lub ntiaj teb zoo kawg nkaus yuav xaus li cas?
Kev ua si muaj ob qhov xaus. Ib qho yog qhov kawg thiab qhov kawg yog qhov kawg. Kuv pom zoo kom ua kom txuag tau thaum lub sijhawm ua haujlwm thiab ua ntej ua tiav txhua qhov kawg kom koj tsis tas yuav rov qab mus kom tau txais qhov kev ua tiav no!
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
In 1688 lub kiv puag ncig zoo kawg nkaus?
Lub Hwjchim Loj Hlob, tseem hu ua "Kev Tawm Tsam ntawm 1688" thiab "Kev Tsis Muaj Ntshav," tshwm sim los ntawm 1688 txog 1689 hauv tebchaws Askiv. Nws koom nrog kev rhuav tshem ntawm Vajntxwv Catholic James II, uas tau hloov los ntawm nws tus ntxhais Protestant Mary thiab nws tus txiv Dutch, William ntawm Orange.
