Video: Ob yam khoom siv li cas los ua tus tswm ciab?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov tswm ciab uas siv ntau tshaj plaws hauv astronomy yog Cepheid Variable hnub qub thiab RR Lyrae hnub qub . Nyob rau hauv ob qho tib si, lub meej magnitude ntawm lub hnub qub tuaj yeem txiav txim siab los ntawm nws lub sijhawm hloov pauv.
Xav txog qhov no, dab tsi tuaj yeem siv los ua tus qauv tswm ciab?
A txheem tswm ciab yog ib chav kawm ntawm cov khoom astrophysical, xws li supernovae lossis cov hnub qub sib txawv, uas tau paub luminosity vim qee cov yam ntxwv zoo muaj los ntawm tag nrho cov chav kawm ntawm cov khoom.
astronomers siv cov tswm ciab txheem li cas? Txheem tswm ciab Yuav luag tag nrho cov khoom siv astronomical siv los ua qhov ntsuas qhov deb ntawm lub cev rau ib chav kawm uas paub qhov kaj. Los ntawm kev sib piv no paub luminosity rau qhov khoom pom qhov ci, qhov deb rau cov khoom tuaj yeem suav tau siv txoj cai inverse-square.
Kuj kom paub yog, hom supernova twg tuaj yeem siv los ua tus tswm ciab txheem?
Nyob rau hauv ib tug series ntawm cov ntaub ntawv nyob rau hauv lub 1990s qhov kev tshawb fawb qhia tias thaum ntawd Hom Ia supernovae tsis txhob tag nrho mus txog tib lub ncov luminosity, ib qho parameter ntsuas los ntawm lub teeb nkhaus siv tau kho tsis tau Hom Ia supernovae rau txheem tswm ciab tus nqi.
Vim li cas Cepheids siv ua tswm ciab txheem?
Cepheids raws li ' Standard tswm ciab ' Ib lub hauv paus ntawm kev paub luminosity nyob rau hauv lub galaxy ua rau peb los sib piv nrog rau tag nrho lwm cov hnub qub nyob rau hauv lub galaxy los txiav txim lawv luminosity.
Pom zoo:
Yuav ua li cas koj thiaj paub tias ib yam dab tsi yog ib yam khoom dawb huv los yog sib tov?
1. Cov tshuaj dawb huv tsis tuaj yeem muab cais ua lwm yam teeb meem, thaum sib xyaw yog sib xyaw ntawm ob lossis ntau dua cov khoom ntshiab. 2. Cov khoom ntshiab muaj lub cev tsis tu ncua thiab tshuaj lom neeg, thaum cov khoom sib xyaw muaj qhov sib txawv ntawm lub cev thiab tshuaj lom neeg (piv txwv li, qhov kub thiab txias)
Cov khoom twg yog cov piv txwv ntawm cov khoom siv tshuaj xyuas txhua yam uas siv?
Piv txwv ntawm cov khoom siv tshuaj muaj xws li flammability, toxicity, acidity, reactivity (ntau hom), thiab kub ntawm combustion. Hlau, piv txwv li, ua ke nrog oxygen nyob rau hauv lub xub ntiag ntawm dej los ua xeb; chromium tsis oxidize (Daim duab 2)
Dab tsi yog qhov sib npaug siv los xam tag nrho cov khoom siv hluav taws xob siv?
Cov mis uas txuas lub zog thiab lub zog yog: Zog = Lub Zog x Sijhawm. Chav tsev ntawm lub zog yog joule, lub zog ntawm lub zog yog watt, thiab chav tsev ntawm lub sijhawm yog qhov thib ob
Yam dab tsi ntawm cov dej zoo tshaj plaws piav qhia nws lub peev xwm los yaj ntau yam khoom siv?
Vim tias nws cov polarity thiab muaj peev xwm tsim cov ntawv cog lus hydrogen, dej ua rau cov kuab tshuaj zoo heev, txhais tau tias nws tuaj yeem yaj ntau hom molecules
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus