Video: Yuav tsum RF qhov tseem ceeb yuav rov ua dua?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Rf nqi yog li ntawd tsis raws nraim rov tsim dua los ntawm ib qho kev sim mus rau lwm qhov, txawm tias muaj kev siv zog los nqa lawv nyob rau hauv tib lub sijhawm. Thaum muab piv ob lossis ntau yam khoom, lawv yuav tsum yuav khiav ib txhij ntawm tib lub phaj los yog qhov kev sib piv yog invalid.
Kuj nug, qhov tseem ceeb ntawm RF qhov tseem ceeb yog dab tsi?
Cov Rf nqi sawv cev rau qhov sib txawv ntawm kev tsiv teb tsaws ntawm qhov tsim cov kuab tshuaj thiab qhov sib xyaw ua ke tau soj ntsuam hauv Thin-Layer Chromatography (TLC). Cov Rf nqi ua hauj lwm raws li ib tug yooj yim ntsuas ntawm cov txheeb ze binding ntawm lub compound ntawm kev txaus siab nyob rau hauv lub sim tej yam kev mob.
Ib yam li ntawd, polarity cuam tshuam li cas rau tus nqi RF? Feem ntau, cov adsorptivity ntawm cov tebchaw nce nrog nce polarity (ie mas polar lub compound ces lub zog nws khi rau lub adsorbent). Tsis- polar cov tebchaw txav mus rau lub phaj sai tshaj plaws (siab dua Rf nqi ), hos polar Cov tshuaj taug kev mus rau TLC phaj maj mam lossis tsis tag (qis dua Rf nqi ).
Yuav ua li cas koj xam Rf tus nqi?
Muab xam Cov Kev Tiv Thaiv Kev Tiv Thaiv Nrog koj tus pas ntsuas, ntsuas qhov kev ncua deb ntawm cov kuab tshuaj mus, uas yog Df, thiab ntsuas qhov kev ncua deb ntawm cov tshuaj ntsuam xyuas, uas yog Ds. Xam cov khoom khaws cia siv qhov sib npaug no: RF = Ds/Df. Cias faib qhov kev ncua deb ntawm qhov kev daws teeb meem los ntawm qhov kev ncua deb ntawm cov kuab tshuaj mus.
Rf tus nqi qhia koj li cas txog purity?
Txawm li cas los xij, vim Rf nqi yog cov txheeb ze, tsis meej, qee cov tebchaw yuav muaj qhov zoo sib xws Rf nqi . Kev ntsuas qhov sib xyaw melting point yog xav tau los txheeb xyuas qhov tsis paub meej. Nws yog siv los ua txiav txim tus kev huv ntawm ib qho kev sib xyaw. Cov khoom ntshiab yuav pom tsuas yog ib qho chaw ntawm TLC phaj tsim.
Pom zoo:
Vim li cas qhov tseem ceeb ntawm qhov tseem ceeb?
Thaum koj pom tus nqi kiag li hauv qhov teeb meem lossis qhov sib npaug, nws txhais tau hais tias txhua yam nyob hauv tus nqi tiag tiag yog qhov zoo. Cov txiaj ntsig tsis zoo feem ntau siv rau hauv cov teeb meem cuam tshuam nrog kev nyob deb thiab qee zaum siv nrog qhov tsis sib xws. Qhov ntawd yog qhov tseem ceeb uas yuav tsum nco ntsoov nws zoo li qhov deb ntawm xoom
Vim li cas cov nuj nqis tseem ceeb tseem ceeb thaum qhia txog kev ntsuas?
Cov duab tseem ceeb yog qhov tseem ceeb los qhia qhov tseeb ntawm koj cov lus teb. Qhov no yog qhov tseem ceeb hauv kev tshawb fawb thiab engineering vim tias tsis muaj cov cuab yeej ntsuas tuaj yeem ua qhov ntsuas nrog 100% precision. Siv cov nuj nqis tseem ceeb tso cai rau tus kws tshawb fawb paub tias cov lus teb meej npaum li cas, lossis qhov tsis paub meej npaum li cas
Vim li cas nws tseem ceeb uas yuav tsum rov ua qhov kev sim thiab sim cov kev xav hauv ntau txoj kev?
Nws yog ib qho tseem ceeb rau cov kws tshawb fawb kom rov sim dua thaum ua qhov kev sim vim tias qhov kev txiav txim siab yuav tsum raug lees paub. Muaj tseeb vim tias cov txiaj ntsig ntawm txhua qhov kev xeem yuav tsum zoo sib xws. Lwm cov kws tshawb fawb yuav tsum tuaj yeem rov ua koj qhov kev sim thiab tau txais cov txiaj ntsig zoo sib xws. Tib txoj hauv kev los ntsuas qhov kev xav yog ua qhov kev sim
Dab tsi yog qhov tseem ceeb tshaj plaws uas yuav tsum muaj rau cov kua dej ntws hauv cov kav dej Dab tsi lwm yam cuam tshuam rau cov dej ntws?
Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom
Vim li cas nws tseem ceeb heev uas yuav tsum xav txog ntau yam thaum txiav txim siab cov hauv paus hniav ntawm cov kab zauv polynomial?
Piv txwv li, tus naj npawb ntawm lub sij hawm ib tug muab polynomial sib npaug muaj ib lub hauv paus ntawm ib tug muab point yog lub multiplicity ntawm lub hauv paus. Qhov kev xav ntawm ntau qhov tseem ceeb yog qhov tseem ceeb kom suav tau kom raug yam tsis muaj kev qhia tshwj xeeb (piv txwv li, ob lub hauv paus suav ob zaug). Li no cov lus qhia, ' suav nrog ntau ntau'