Video: Nyob rau hauv dab tsi kev taw qhia yog qhov siab tshaj plaws ntawm kev nce?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov qhov siab tshaj plaws ntawm kev hloov yog li ntawd thiab tshwm sim nyob rau hauv lub kev taw qhia ntawm gradient, $ abla f(2, 0) = (0, 2)$, thiab qhov tsawg kawg nkaus tus nqi hloov yog thiab tshwm sim hauv lub kev taw qhia rov qab ntawm qhov gradient, uas yog $- abla f(2, 0) = (0, -2)$. Yog li ntawd.
Ib yam li ntawd, ib tug yuav nug, nyob rau hauv cov kev taw qhia twg muaj nuj nqi nce sai tshaj plaws?
Gradient yog kev taw qhia ntawm muaj nuj nqi nce sai tshaj plaws ntawm qhov taw tes. Qhov tsis zoo gradient tus nqi yog qhov kev taw qhia ntawm muaj nuj nqi txo ceev tshaj plaws ntawm qhov taw tes.
Tsis tas li ntawd, vim li cas qhov gradient taw tes rau qhov kev taw qhia ntawm kev nce siab tshaj plaws? Cov gradient ntawm ib tug multi-variable muaj nuj nqi muaj ib feem rau txhua kev taw qhia . Thiab ib yam li cov derivative tsis tu ncua, lub gradient cov ntsiab lus nyob rau hauv cov kev taw qhia ntawm loj tshaj plaws nce (ntawm no yog vim li cas: peb pauv cov lus tsa suab hauv txhua qhov kev taw qhia txaus kom them nyiaj ntau tshaj).
Tsuas yog ua li cas koj thiaj paub tias txoj kev twg yog qhov chaw siab tshaj?
2x, 2y=2?x,y; Qhov no yog vector parallel rau vector ?x, y?, yog li cov kev taw qhia ntawm steepest ascent yog ncaj qha deb ntawm lub hauv paus chiv keeb, pib ntawm qhov taw tes (x, y). Cov kev taw qhia ntawm qhov siab tshaj plaws yog li ncaj qha mus rau lub hauv paus chiv keeb los ntawm (x, y).
Maximum directional derivative yog dab tsi?
Muab qhov ua haujlwm f ntawm ob lossis peb qhov sib txawv thiab taw tes x (hauv ob lossis peb qhov ntev), qhov siab kawg tus nqi ntawm cov kev taw qhia derivative thaum ntawd, Duf(x), yog |Vf(x)| thiab nws tshwm sim thaum koj muaj tib cov kev taw qhia raws li gradient vector Vf(x).
Pom zoo:
Dab tsi yog rau qhov sib txawv loj ntawm lub koom haum los ntawm qhov tsawg tshaj plaws mus rau loj tshaj plaws ecologists?
Lub koom haum loj yog dab tsi, los ntawm qhov tsawg tshaj plaws mus rau qhov loj, uas cov kws tshawb fawb feem ntau kawm? 6 theem sib txawv ntawm lub koom haum uas ecologists nquag kawm yog hom, pejxeem, zej zog, ecosystem, thiab biome
Dab tsi yog qhov yuam kev loj tshaj plaws yog tias Irina ntsuas qhov ntev ntawm nws lub qhov rais li 3.35 feet qhov yuam kev loj tshaj plaws yog taw?
Kev daws: Qhov yuam kev loj tshaj plaws hauv kev ntsuas ntsuas tau txhais tias yog ib nrab ntawm qhov ntsuas ntsuas
Dab tsi yog cov ions nyob rau hauv siab tshaj plaws concentration nyob rau hauv lub extracellular kua?
Cov tshuaj no nyob rau hauv cov kua dej extracellular thiab intracellular. Nyob rau hauv cov kua dej extracellular, cov cation loj yog sodium thiab cov anion loj yog chloride. Qhov loj cation nyob rau hauv cov kua dej intracellular yog poov tshuaj. Cov electrolytes no ua lub luag haujlwm tseem ceeb hauv kev tswj hwm homeostasis
Dab tsi yog qhov kev piav qhia zoo tshaj plaws ntawm lub ntiaj teb nebula yog dab tsi?
Planetary nebula yog ib qho khoom siv hnub qub uas muaj lub plhaub ci ntsa iab ntawm cov pa roj thiab cov ntshav uas tsim los ntawm qee hom hnub qub thaum kawg ntawm lawv lub neej. Lawv nyob rau hauv qhov tseeb tsis cuam tshuam rau cov ntiaj chaw; lub npe originates los ntawm ib tug supposed zoo sib xws nyob rau hauv tsos rau giant ntiaj chaw
Dab tsi yog qhov siab tshaj plaws ntawm qhov poob siab tso cai rau hauv av xaim?
NEC pom zoo tias qhov siab tshaj plaws ua ke voltage poob rau ob qho tib si feeder thiab ceg Circuit Court yuav tsum tsis txhob ntau tshaj 5%, thiab qhov siab tshaj plaws ntawm lub feeder lossis ceg Circuit Court yuav tsum tsis txhob ntau tshaj 3% (Fig. 1). Qhov kev pom zoo no yog qhov teeb meem kev ua haujlwm, tsis yog teeb meem kev nyab xeeb