Lub ntiaj teb lub pob zeb, uas tib neeg nkag tau, ncav cuag qhov tob txog li 20 km. Nws muaj 95% pob zeb igneous, 4% metamorphic pob zeb thiab 1% sedimentary pob zeb. Hauv paus txawm, pob zeb uas siv tau los ntawm noob neej thiab rau lawv tus kheej lub hom phiaj yog hu ua minerals. Thiab lub ntuj accumulations ntawm cov minerals nyob rau hauv lub ntiaj teb crust yog cov ntxhia deposits, lawv tuaj yeem xoob thiab thawj. Kawg hloov kho: 2023-12-17 05:12
Science 2024, Hlis ntuj nqeg
Cia peb qhia cov yam ntxwv ntawm cov cuab yeej siv rau kev tsim cov cawv denatured, nrog rau cov peev txheej ntawm nws daim ntawv thov. Kawg hloov kho: 2023-12-17 05:12
Kev cai lij choj pej xeem raws li kev tshawb fawb tau txais txiaj ntsig ntau dua los ntawm kev txhim kho ntawm lub xeev thiab kev lag luam kev lag luam. Thiab txhawm rau kom nkag siab tag nrho cov intricacies ntawm qhov teeb meem no, koj yuav tsum paub koj tus kheej nrog cov ntaub ntawv hauv qab no. Kawg hloov kho: 2023-12-17 05:12
Txoj cai lij choj raws li kev tshawb fawb, kev lag luam thiab kev qhuab qhia kev kawm yog cov lus nug nquag hauv kev xeem rau cov tub ntxhais kawm txoj cai lij choj. Yuav kom nkag siab lub ntsiab lus thiab qhov tseem ceeb ntawm txoj cai lij choj raws li kev tshawb fawb, nws yog ib qho tsim nyog los kawm tag nrho cov subtleties ntawm qhov teeb meem no. Kawg hloov kho: 2023-12-17 05:12
Qhov kev tshawb pom ntawm neutron yog qhov chaw nyob ntawm lub sijhawm atomic ntawm tib neeg, txij li thaum nyob rau hauv txhais tes ntawm physicists muaj ib tug particle muaj peev xwm, vim tsis muaj nqi, nkag mus rau hauv ib yam, txawm hnyav, nuclei. Hauv chav kawm ntawm kev sim ntawm kev foob pob ntawm uranium nuclei los ntawm neutrons, ua los ntawm Italian physicist E. Fermi, radioactive isotopes thiab transuranium ntsiab, neptunium thiab plutonium, tau txais. Kawg hloov kho: 2023-12-17 05:12
Karl Braun yog tus kws kho mob German uas nyob hauv ib nrab ntawm xyoo 19th - thawj xyoo caum ntawm lub xyoo pua 20th thiab tau los ua nto moo ua tsaug rau kev tsim cov cathode ray raj - kinescope. Hauv qee lub tebchaws, cov cuab yeej no tseem muaj npe tom qab tus kws tshawb fawb. Karl Braun tshwj xeeb hauv kev siv cov khoom siv hluav taws xob hluav taws xob. Xyoo 1909, tus kws tshawb fawb tau txais lub npe Nobel laureate hauv physics. Kawg hloov kho: 2023-12-17 05:12
Stray currents yog ib hom kev taw qhia ntawm cov khoom siv hluav taws xob uas tshwm sim hauv ntiaj teb thaum yav tas los siv los ua tus neeg xyuas pib. Qhov kev phom sij tseem ceeb ntawm qhov tshwm sim no yog kev txhim kho corrosion ntawm cov khoom hlau uas nyob hauv av los yog tsawg kawg yog ib feem ntawm kev sib cuag nrog nws. Kawg hloov kho: 2023-12-17 05:12
Tej zaum ib tug me nyuam yuav qhia rau koj paub tias nag lossis daus yog dab tsi. Los nag, daus, lawg… Ntawd yog, cov dej noo uas ntog saum ntuj los rau hauv av. Txawm li cas los xij, tsis yog txhua tus tuaj yeem hais meej tias cov dej no los ntawm qhov twg. Nws yog tseeb hais tias los ntawm cov huab (txawm hais tias qhov no kuj tsis yog ib tug ruaj khov txoj cai), tab sis qhov twg cov huab los saum ntuj? Yuav kom nkag siab qhov ua rau thiab qhov xwm txheej ntawm cov dej nag, nag thiab daus hla peb lub taub hau, koj yuav tsum tau txais lub tswv yim ntawm kev sib pauv ntawm cov tshauv-dav-o ntawm lub ntiaj teb. Kawg hloov kho: 2023-12-17 05:12
Dab tsi yog qhov txawv ntawm cov cuab yeej tiv thaiv kev siv av thiab hauv av, cov hauv paus ntsiab lus ntawm kev ua haujlwm, tsab ntawv sau npe ntawm cov tshuab. Kawg hloov kho: 2023-12-17 05:12
Cov kab lus hais txog vim li cas txhawm rau txhawm rau uranium, nws yog dab tsi, qhov twg nws tau mined, nws daim ntawv thov thiab cov txheej txheem enrichment yog dab tsi. Kawg hloov kho: 2023-12-17 05:12
Molecular biological tshawb fawb txoj hauv kev ua lub luag haujlwm tseem ceeb hauv cov tshuaj niaj hnub, forensics thiab biology. Ua tsaug rau kev nce qib hauv kev tshawb fawb ntawm DNA thiab RNA, tus neeg muaj peev xwm kawm txog genome ntawm cov kab mob, txiav txim siab tus neeg sawv cev ntawm tus kab mob, paub txog qhov xav tau ntawm nucleic acid hauv kev sib xyaw ntawm cov kua qaub, thiab lwm yam. Kawg hloov kho: 2023-12-17 05:12
Symbolic logic yog ib hom lus yooj yim ntawm kev xav ntawm kev xav, uas yog qhia los ntawm cov qauv lej thiab cov lus xaus ntawm kev daws teeb meem. Yog hais tias logic nyob rau hauv lej yuav siv sij hawm mus rau hauv tus account tag nrho cov lus tseeb thiab tsis tseeb, ces lub hauv paus ntawm kev tshawb nrhiav qhov tseeb yuav muab raws li algebraic theorems. Kawg hloov kho: 2023-12-17 05:12
Biochemical method - txoj hauv kev tseem ceeb hauv biochemistry los ntawm cov txheej txheem tseem ceeb hauv kev kuaj mob ntawm ntau yam kab mob uas ua rau cov kab mob metabolic. Nws yog hom kev tshuaj ntsuam no uas yuav tau tham hauv kab lus no. Kawg hloov kho: 2023-12-17 05:12
Yog tsis muaj kev tsim, nws nyuaj rau kev txhim kho kev lag luam, koom nrog kev tsim kho, tsim qauv spatial. Cia peb tsom xam cov theoretical foundations ntawm kev tsim. Kawg hloov kho: 2023-12-17 05:12
Superconductivity yog cov cuab yeej ntawm qee cov ntaub ntawv kom tsis txhob muaj hluav taws xob nruj me ntsis thaum lawv ncav cuag qhov kub ntawm ib qho nqi (qhov kub tseem ceeb). Ob peb puas tebchaw, cov ntsiab lus ntshiab, alloys thiab ceramics paub, dhau mus rau hauv lub xeev superconducting. Kawg hloov kho: 2023-12-17 05:12
Thaum pib, kev siv lub zog nuclear tau npaj rau kev ua tub rog, tab sis tom qab ntawd nws pib siv rau hauv pej xeem lub neej. Nuclear zog ua lub luag haujlwm tseem ceeb hauv kev lag luam hluav taws xob. Kawg hloov kho: 2023-12-17 05:12
Nyob rau hauv cov xwm txheej tam sim no ntawm kev loj hlob ntawm tib neeg, kev txaus siab rau kev txheeb cais raws li kev tshawb fawb thiab nws cov kev siv dav hauv kev xyaum tau nce ntau. Niaj hnub no, tsis muaj leej twg tuaj yeem tsis lees paub qhov tseem ceeb thiab saib tsis taus lub luag haujlwm ntawm kev txheeb cais hauv pej xeem lub neej. Cov ntaub ntawv txheeb cais pab txhawb rau kev tsim lub tswv yim tsim nyog ntawm lub xeev tam sim no hauv lub tebchaws. Ua tsaug rau qhov no, yog tias muaj qhov sib txawv lossis tsis sib xws, nws tuaj yeem ua tau ntau yam kev ntsuas kom raug raws sijhawm. Kawg hloov kho: 2023-12-17 05:12
Nyob rau xyoo pua 16th, kev xav txog kev lag luam hauv Tebchaws Europe tau hloov pauv tseem ceeb: kev tshawb nrhiav kev tshawb fawb rau cov peev txheej peev nyiaj tau pib. Lub sijhawm muaj kev kub ntxhov no yog qhov raug suav tias yog lub sijhawm ntawm kev tsim cov peev txheej thaum ub, lub sijhawm uas cov tebchaws nyob sab Europe tau pib ua lag luam thiab kev lag luam nthuav dav, thiab lwm yam. Lub sijhawm no, bourgeoisie tau yeej rov qab txoj haujlwm tsis yog hauv kev nom kev tswv, tab sis kuj hauv kev lag luam. Kawg hloov kho: 2023-12-17 05:12
Cov kab lus qhia txog dab tsi tooj liab thiab tooj dag yog ua los ntawm, dab tsi ntawm lawv muaj nyob, cov khoom dab tsi yog tsim los ntawm cov alloys. Kawg hloov kho: 2023-12-17 05:12
Ntau zaus hauv physics ib qho yuav tsum tau daws cov teeb meem rau kev xam qhov sib npaug hauv cov txheej txheem nyuaj uas muaj ntau lub zog ua haujlwm, levers thiab axes ntawm kev sib hloov. Hauv qhov no, nws yog qhov yooj yim tshaj plaws los siv lub tswv yim ntawm lub sijhawm ntawm lub zog. Kab lus no muab tag nrho cov qauv tsim nyog nrog cov lus piav qhia ntxaws uas yuav tsum tau siv los daws cov teeb meem ntawm hom no. Kawg hloov kho: 2024-01-02 17:01
Cov khoos phis tawj niaj hnub khaws cov ntaub ntawv ntawm hard drives siv lub hauv paus ntsiab lus ntawm kev sau npe sib nqus, uas yog raws li lub voj voog hysteresis. Kawg hloov kho: 2023-12-17 05:12
Ionized roj: nws yog dab tsi, tau txais, daim ntawv thov, hom ntshav ntshav, plaub lub xeev ntawm teeb meem. Kawg hloov kho: 2023-12-17 05:12
Txoj haujlwm tshiab uas siv cov khoom siv hluav taws xob niaj hnub no yuav tso cai rau kev tswj hwm thermonuclear fusion sai sai, qee tus kws tshaj lij hais. Cov kws tshaj lij, txawm li cas los xij, kwv yees tias daim ntawv thov siv tau yuav siv sijhawm ntau xyoo. Kawg hloov kho: 2023-12-17 05:12
Koj tuaj yeem paub seb cov qauv zoo sib xws yog dab tsi thiab lawv qhov txawv ntawm qhov kev paub zoo (kev ntsuam xyuas, kev tsim khoom, thiab lwm yam) hauv kab lus. Kawg hloov kho: 2024-01-02 17:01
Cryonics yog ib qho cuab yeej txawv txawv heev, uas, ntxiv rau txhua yam, ua rau muaj kev tsis sib haum xeeb thiab tsis sib haum xeeb. Tsis xav tsis thoob, vim hais tias cov txheej txheem cuam tshuam nrog kev khov ib tus neeg uas tuaj yeem rov ua dua yav tom ntej. Puas yog tiag? Cov txheej txheem mus li cas? Qhov ntawd xav tau dabtsi? Puas muaj kev paub? Lub ntsiab lus no muaj ntau cov lus nug. Thiab txhua tus ntawm lawv tsim nyog sim teb. Kawg hloov kho: 2023-12-17 05:12
Zaj lus hais txog peb cov neeg nyob ze hauv lub hnub ci, lub ntiaj teb Venus. Cov theem ntawm Venus thiab lawv qhov sib txawv ntawm lub hli lunar tau piav qhia. Nws yog hais txog cov yam ntxwv ntawm lub ntiaj teb no. Kawg hloov kho: 2023-12-17 05:12
Kev paub zoo ib txwm tshwm sim hauv peb lub neej nyob rau hauv daim ntawv qhia, hais lus, cim. Dab tsi yog nws cov yam ntxwv? Puas yog qhov txawv ntawm kev paub txog science lossis tsis? Koj yuav pom qhov no thiab ntau ntxiv hauv kab lus no. Kawg hloov kho: 2023-12-17 05:12
Tam sim no, tsis muaj ib puag ncig ntawm zej zog tuaj yeem tswj hwm yam tsis muaj kev kwv yees raws li txoj hauv kev pom. Forecasting yog siv nyob rau hauv ntau yam kev lag luam: hauv kev lag luam, kev tswj hwm, kev ua kis las, kev lag luam, thiab lwm yam. Nws muaj peev xwm kos cov lus xaus ua ntej txog ntau yam txheej txheem, tshwm sim, kev cuam tshuam thiab kev ua haujlwm uas siv cov khoom sib txawv thiab cov qauv. Kawg hloov kho: 2023-12-17 05:12
Txoj kev sau ntawv yog dab tsi? Nco ntsoov tias nws tuaj yeem siv los ntsuas qhov yuav tshwm sim ntawm txoj kev loj hlob ntawm qee yam xwm txheej, nrog rau kev pom txog qhov tshwm sim ntawm kev txiav txim siab. Piv txwv li, nws muaj peev xwm kwv yees qhov ua tau ntawm kev qhib lub chaw lom zem rau menyuam yaus, suav cov txiaj ntsig, thiab pom tias yuav poob. Kawg hloov kho: 2023-12-17 05:12
Tshaj tawm cov txheej txheem ntawm kev ua lag luam thiab ntsuas qhov siv tau ntawm cov kev xav tau muab tso rau tom ntej, kev sim kev lag luam yog siv, uas nyob rau hauv niaj hnub qhov tseeb tuaj yeem ua tsis tau tsuas yog nyob rau hauv qhov txwv. Nws tso cai rau koj kom tau txais cov ntaub ntawv hais txog tus cwj pwm zoo ntawm cov neeg ua haujlwm ntawm kev lag luam hauv kev tswj hwm. Kawg hloov kho: 2023-12-17 05:12
Science yog ib txoj hauv kev ntawm kev paub uas nyob rau hauv kev txhim kho tas mus li. Nws tshawb txog lub hom phiaj txoj cai ntawm qhov xwm txheej, kev xav, kev tsim thiab kev ua ntawm tib neeg. Kev txawj ntse hloov mus rau hauv kev tsim khoom ncaj qha. Kawg hloov kho: 2023-12-17 05:12
Kev cuam tshuam ntawm Marxism ntawm kev coj noj coj ua hauv xyoo pua 20th yog qhov zoo heev. Karl Marx nrhiav los tsim ib lub hom phiaj nruj me ntsis ntawm kev txhim kho kev sib raug zoo raws li keeb kwm tseeb. Muaj tseeb nws ua tiav. Kawg hloov kho: 2023-12-17 05:12
Txij thaum me nyuam yaus, peb tau paub txog poov tshuaj permanganate nyob rau hauv lub npe txawv, cuam tshuam nrog plab hnyuv thiab lo lus phem "kab mob". Ordinary poov tshuaj permanganate, ntxim nyiam nrog nws cov xim "glamorous". Tab sis li cas cov xim zoo li no tshwm sim - tom qab tag nrho, ib qho me me dub tau ntxiv rau hauv dej ?. Kawg hloov kho: 2023-12-17 05:12
Muaj tseeb koj tau hnov ntau dua ib zaug los ntawm ntau yam xov xwm hais txog qhov xav tau cua daj cua dub. Koj puas paub tias nws yog sunspots, qhov xwm txheej uas tau ntev dhau los ua qhov tsis paub zoo rau tib neeg, uas yog lub luag haujlwm rau qhov tshwm sim no? Nws yog dab tsi, thiab lawv tshwm sim li cas?. Kawg hloov kho: 2023-12-17 05:12
Nyob rau hauv niaj hnub inorganic chemistry, kev faib cov ntsev, kev sib cuam tshuam thiab cov khoom ntawm cov ntsiab lus thiab lawv ntau cov tebchaw yog qhov tseem ceeb heev. Muaj cov khoom uas, ntawm lwm tus, nyob hauv qhov chaw tshwj xeeb. Xws li cov tebchaw, tshwj xeeb, yuav tsum muaj calcium sulfate. Cov qauv ntawm cov khoom CaSO4. Kawg hloov kho: 2023-12-17 05:12
Nyob rau hauv cov txheej txheem ntawm cov tshuaj tiv thaiv, dab tsi yog theoretically npaj tsis yog ib txwm tau, yam tsawg kawg nkaus. Qhov no feem ntau yog vim muaj cov tshuaj tiv thaiv nyuaj - qhov kub tsis zoo, kev sib cuag tsis txaus nrog cov catalyst, thiab tsuas yog cov tshuaj tsis huv ntawm cov reagents. Nyob rau hauv cov ntaub ntawv no, chemists siv lo lus "loj feem ntawm cov yield". Kawg hloov kho: 2023-12-17 05:12
Kinetic zog yog, raws li lub ntsiab lus, qhov ntau npaum li cas sib npaug ntawm ib nrab ntawm lub cev txav mus los, muab faib los ntawm cov square ntawm qhov ceev ntawm lub cev. Qhov no yog ib lo lus tseem ceeb tshaj plaws nyob rau hauv niaj hnub mechanics. Nyob rau hauv luv luv, qhov no yog lub zog ntawm kev txav, los yog qhov sib txawv ntawm tag nrho lub zog thiab tus so lub zog. Kawg hloov kho: 2023-12-17 05:12
Xav txog deformations: shear, nro, dabtsi yog khoov, torsion. Cia peb txheeb xyuas lawv cov kev siv hauv lub ntiaj teb niaj hnub no. Kawg hloov kho: 2023-12-17 05:12
Oxygen muaj nyob rau hauv cov huab cua hauv peb hom allotropic: O2 - molecular, O - atomic thiab O3 - cov mis ntawm ozone, uas tau los ntawm kev sib xyaw ua ke ntawm thawj ob. Kawg hloov kho: 2023-12-17 05:12
Ua tsaug rau cov hlab ntsha qaum, tus txha caj qaum xa cov ntaub ntawv hais txog lub xeev ntawm sab hauv thiab sab nraud ib puag ncig mus rau lub hlwb thiab rov ua dua. Muaj kev sib raug zoo ntawm lub hauv nruab nrab thiab lub paj hlwb peripheral, uas ua kom muaj kev ua haujlwm ntawm lub cev tag nrho. Kawg hloov kho: 2023-12-17 05:12