Video: Dab tsi yog 3 yam ntawm kev tshawb fawb ntawm cov pej xeem?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov kawm ntawm demography yeej muaj peb yam : kev tuag, fertility, thiab tsiv teb tsaws, tab sis tsuas yog thawj ob tau txais kev saib xyuas ntau hauv niaj hnub no kev kawm ntawm lub ntiaj teb thaum ub.
Ntawm no, 3 yam ntawm cov pejxeem loj hlob yog dab tsi?
Qhov loj cov ntsiab lus ntawm kev loj hlob ntawm cov pejxeem yog Birth Rate, Death Rate thiab Migration. Kev yug me nyuam yog tus naj npawb ntawm yug nyob rau ib txhiab tus neeg hauv ib xyoos. Nws yog ib qho loj tiv thaiv kev loj hlob. Kev tuag yog tus naj npawb ntawm cov neeg tuag ib txhiab tus neeg hauv ib xyoos.
Qhov thib ob, qhov muaj pes tsawg leeg ntawm cov pejxeem yog dab tsi? Cov pejxeem muaj pes tsawg leeg yog qhov piav qhia ntawm pej xeem txhais los ntawm cov yam ntxwv xws li hnub nyoog, haiv neeg, poj niam txiv neej los yog txij nkawm. Cov lus piav qhia no tuaj yeem tsim nyog rau kev nkag siab txog kev sib raug zoo ntawm kev tshawb fawb keeb kwm thiab kev sib piv. Cov ntaub ntawv no feem ntau muab piv nrog a pej xeem pyramid.
Ib yam li ib tug yuav nug, qhov kev kawm ntawm cov pejxeem hu ua dab tsi?
Demography - cov kawm ntawm tib neeg cov pejxeem . Demography yog tus kawm ntawm tib neeg cov pejxeem - lawv qhov loj me, muaj pes tsawg leeg thiab kev faib tawm thoob plaws qhov chaw - thiab cov txheej txheem los ntawm qhov ntawd cov pejxeem hloov. Yug, tuag thiab tsiv teb tsaws yog 'peb loj' ntawm cov pej xeem, sib koom ua ke pej xeem stability lossis hloov.
Kev kawm txog cov yam ntxwv ntawm pej xeem yog dab tsi?
Kev tshawb fawb txog kev sau thiab tshuaj xyuas cov lej no yog hu ua pej xeem demographics, tseem hu ua demography. Kev txhais dav dav, demography yog tus kawm ntawm yam ntxwv ntawm cov pejxeem . Nws muab ib tug lej piav qhia txog yuav ua li cas cov yam ntxwv hloov raws sijhawm.
Pom zoo:
Dab tsi yog qhov sib txawv ntawm cov alleles ntawm cov tib neeg hauv cov pej xeem hu ua?
Cov Txheej Txheem Sib Sau ntawm Alleles hauv Cov Pej Xeem yog Nws Gene Pas. Population geneticists kawm txog qhov sib txawv uas ib txwm tshwm sim ntawm cov noob hauv cov pejxeem. Kev sau ntawm tag nrho cov noob thiab ntau hom kev hloov pauv lossis allelic ntawm cov noob hauv cov pejxeem yog hu ua nws cov gene pool
Dab tsi yog thaj chaw ntawm pej xeem kev hloov pauv thiab vim li cas nws thiaj li muaj txiaj ntsig thaum kawm txog pej xeem?
Population dynamics yog ceg ntawm lub neej sciences uas kawm txog qhov loj thiab hnub nyoog muaj pes tsawg leeg ntawm cov pejxeem raws li dynamical systems, thiab cov txheej txheem lom thiab ib puag ncig tsav lawv (xws li yug thiab tuag tus nqi, thiab los ntawm kev nkag teb chaws thiab emigration)
Dab tsi yog qhov teeb meem loj tshaj plaws ntawm kev siv cov kev tshawb fawb txog kev sib raug zoo?
Tej yam tsis zoo los yog kev tshawb fawb txog kev sib raug zoo muaj xws li: a. Lawv tsis tuaj yeem siv los tsim kom muaj kev sib raug zoo-thiab-tshuaj los yog kev coj ntawm kev cuam tshuam
Kev tshawb fawb hauv kev tshawb xav yog dab tsi?
Kev tshawb fawb txoj kev xav yog kev paub dav dav uas tuav los ntawm cov tswv cuab ntawm ib pab pawg neeg hais txog qhov tshwm sim ntawm kev sib raug zoo thaum lub ntsiab lus theoretical muab cov lus piav qhia txog qhov teeb meem los ntawm cov haujlwm uas twb muaj lawm hauv ib qho kev kawm xws li kev ua haujlwm, phenomenology, kev sib raug zoo, kev lees paub txoj kev xav. Social Science. Txoj kev tshawb fawb
Dab tsi yog cov yam ntxwv ntawm nthwv dej hauv kev tshawb fawb?
Muaj ntau yam khoom uas cov kws tshawb fawb siv los piav txog nthwv dej. Lawv suav nrog amplitude, zaus, lub sijhawm, wavelength, ceev, thiab theem. Txhua yam ntawm cov khoom no tau piav qhia ntau ntxiv hauv qab no. Thaum kos ib nthwv dej los yog saib nthwv dej ntawm ib daim duab, peb kos lub nthwv dej raws li lub sijhawm