Science 2024, Hlis ntuj nqeg

British molecular biologist, biophysicist thiab neuroscientist Francis Crick: biography, achievements, discoveries thiab nthuav tseeb

Crick Francis Harry Compton yog ib tus ntawm ob tus kws tshawb fawb molecular biologist uas tau nthuav tawm qhov paub tsis meej ntawm cov qauv ntawm cov ntaub ntawv caj ces deoxyribonucleic acid (DNA), yog li tso lub hauv paus rau niaj hnub molecular biology. Kawg hloov kho: 2023-12-17 05:12

Muaj peev xwm nyob tau ntiaj chaw

Habitable Earth-zoo li ntiaj chaw - puas yog kev npau suav? Cov kws tshawb fawb qhia tias cov neeg nyob hauv lub qab ntuj khwb tsis yog qhov txawv. Kawg hloov kho: 2024-01-02 17:01

Alien nkoj: hom thiab duab

Cov kws tshawb fawb ntseeg tias tib neeg tau pom cov nkoj txawv teb chaws txij li thaum ub. Qhov no tau lees paub los ntawm ntau cov dab neeg, dab neeg thiab dab neeg uas piav txog cov khoom zoo kawg nkaus uas ya hla saum ntuj, nrog rau cov tsiaj uas tawm ntawm lawv. Kawg hloov kho: 2023-12-17 05:12

Manganese sulfate: tau txais, lub cev thiab tshuaj lom neeg, kev siv, kev nyab xeeb

Kab lus piav qhia txog ntsev xws li manganese (II) sulfate. Ntawm no, nws txoj kev tau txais, tshuaj lom neeg thiab lub cev muaj zog raug tshuaj xyuas. Kev siv cov tshuaj no hauv kev ua liaj ua teb ua chiv tau nthuav tawm kom ntxaws. Kawg hloov kho: 2024-01-02 17:01

Neeg dawb. Kev faib tawm ntawm tib neeg haiv neeg

Hnub no, ntau dua 7 billion tus neeg nyob hauv peb lub ntiaj teb. Cov kws tshawb fawb kwv yees tias los ntawm 2050 daim duab no tuaj yeem nce mus txog 9 billion. Peb txhua tus zoo ib yam - thiab peb txhua tus muaj qhov tshwj xeeb. Tib neeg txawv ntawm qhov tsos, xim tawv nqaij, kab lis kev cai thiab tus cwj pwm. Niaj hnub no peb yuav tham txog qhov sib txawv tshaj plaws hauv peb cov pej xeem - xim ntawm daim tawv nqaij. Kawg hloov kho: 2023-12-17 05:12

Cov khoom tawg: nws yog dab tsi?

Cov kab lus yuav tham txog yam khoom tawg yog dab tsi, nws yog dab tsi, nws tshwm sim li cas, ntau yam thiab daim ntawv thov. Kawg hloov kho: 2023-12-17 05:12

Taylor's Theory: Ntsiab Lus, Cov Ntsiab Lus thiab Cov Ntsiab Lus

Thaum tig ntawm 19th-20th centuries, ib ceg tshiab ntawm kev paub txog kev tshawb fawb tshwm sim - kev puas siab puas ntsws ntawm kev tswj hwm, thiab ib qho ntawm cov neeg nyiam tshaj plaws yog txoj kev xav ntawm lub koom haum tshawb fawb ntawm kev ua haujlwm tsim los ntawm Frederick Taylor. Taylor tau piav qhia nws lub tswv yim tseem ceeb hauv phau ntawv "Principles of Scientific Management", luam tawm xyoo 1911. Kawg hloov kho: 2023-12-17 05:12

Lub tswvyim ntawm kev kub ntxhov. Typology ntawm kev kub ntxhov. Ua rau thiab qhov tshwm sim ntawm kev kub ntxhov

Kev kub ntxhov yog qhov tsis txaus siab tsis tuaj yeem zam tau. Txhua qhov system, ib txoj kev lossis lwm qhov, ntsib teeb meem loj, kev tawm tsam uas yog qhov kev sim ntawm lub zog. Hom kev kub ntxhov twg muaj nyob tau piav qhia hauv kab lus no. Kawg hloov kho: 2023-12-17 05:12

Cov Ntsiab Cai ntawm Kev Saib Xyuas Kev Nyab Xeeb: Txhais thiab Daim Ntawv Thov

Txij thaum xyoo 19th, kev saib xyuas kev xav tau yog lub hauv paus ntawm kev nom kev tswv lub neej thiab yog ib qho tseem ceeb hauv kev loj hlob ntawm kev sib raug zoo. Yuav ua li cas cov hauv paus ntsiab lus ntawm kev saib xyuas tau tshwm sim, qhov kev hloov pauv uas lawv tau dhau mus, nrog rau lawv daim ntawv thov kev cai lij choj tau piav qhia hauv kab lus no. Kawg hloov kho: 2023-12-17 05:12

Local Group of Galaxies: ze tshaj galaxy mus rau Milky Way

Txawm hais tias muaj kev lig kev cai ntawm kev kawm lub qab ntuj khwb ntev, txiv neej tsis paub ntau txog nws. Feem ntau ntawm cov ntaub ntawv tau txais nyob rau hauv ib cheeb tsam me me ntawm qhov chaw hu ua Local Group of Galaxies. Kab lus no tham txog qhov chaw no yog dab tsi. Kawg hloov kho: 2023-12-17 05:12

Pseudoscience - yog dab tsi

Nws yuav tsum tau lees paub: ib feem tseem ceeb ntawm cov pej xeem tsis txaus siab rau pseudoscience thiab kev tawm tsam. Txawm li cas los xij, pseudoscience tam sim no yog ib qho teeb meem loj tshaj plaws uas ntsib kev tshawb fawb hauv zej zog. Nws tshwm sim, cov cim qhia thiab cov piv txwv, nrog rau cov kev daws teeb meem nrog nws tau piav qhia hauv kab lus no. Kawg hloov kho: 2023-12-17 05:12

Cov yam ntxwv ntawm cov ntxhia metabolism: txhais, piav qhia thiab nthuav qhov tseeb

Lub cev tib neeg yog ib txoj hauv kev nyuaj heev uas koom nrog kev siv ntau yam txheej txheem. Ib tug ntawm lawv yog mineral metabolism. Nws yog ib nqi sau cia hais tias cov txheej txheem no yog ib tug ua ke ntawm ob peb cais me me txheej txheem tshwm sim nyob rau hauv lub cev. Kawg hloov kho: 2023-12-17 05:12

Daniel Bell thiab txoj kev xav ntawm kev lag luam tom qab kev lag luam

Daniel Bell (yug Lub Tsib Hlis 10, 1919, New York, New York, Tebchaws Asmeskas - tuag Lub Ib Hlis 25, 2011, Cambridge, Massachusetts) yog ib tus kws tshaj lij Asmeskas thiab neeg sau xov xwm uas siv kev xav txog kev coj noj coj ua los kho dab tsi, hauv nws lub tswv yim, yog qhov kev tsis sib haum xeeb ntawm cov peev txheej hauv zej zog. Nws tau qhia txog lub tswv yim ntawm kev lag luam sib xyaw, sib xyaw cov khoom ntiag tug thiab pej xeem. Kawg hloov kho: 2023-12-17 05:12

Anti-kev sib txhuam cov khoom ntawm cov ntaub ntawv thiab lawv cov muaj pes tsawg leeg

Cov cuab yeej siv tshuab feem ntau siv rau tib neeg kev ua ub no. Kev ntseeg tau ntawm kev txav ntawm qhov chaw hauv txhua lub tshuab yog ua kom ntseeg tau los ntawm kev txo qis kev sib txhuam thiab deformation. Rau qhov no, cov khoom siv tshwj xeeb hu ua antifriction. Lawv lub hom phiaj tseem ceeb yog txo cov coefficient ntawm kev sib txhuam, ua kom yooj yim rau kev zawv zawg ntawm qhov txav ntawm cov txheej txheem. Kab lus no yuav xav txog cov khoom tiv thaiv kev sib txhuam ntawm ntau yam ntaub ntawv siv rau lub hom phiaj no. Kawg hloov kho: 2023-12-17 05:12

Nickel nyiaj: alloy muaj pes tsawg leeg, yam ntxwv, daim ntawv thov

Nickel nyiaj yog cov hlau alloy uas muaj feem ntau ntawm tooj liab nrog ntxiv ntawm nickel thiab zinc. Nyob rau hauv qee txoj kev, nws yog ib qho analogue ntawm cov hlau qub qub ntawm tib lub ntsiab lus - cupronickel, tab sis pheej yig dua nws. Cov nyiaj npib tsib xee yog siv los ua cov khoom siv ntsuas, cov cuab yeej kho mob, cov hniav nyiaj hniav kub, cutlery thiab ntau ntxiv. Kawg hloov kho: 2023-12-17 05:12

James Lange txoj kev xav ntawm kev xav: keeb kwm, kev thuam thiab piv txwv

Thaum kawg ntawm lub xyoo pua 19th, ib txoj kev xav tau tsim, cov neeg sau ntawv uas tsis paub sib paub, tab sis tib lub sijhawm los xaus tib yam. Lawv yog William James thiab Carl Lange. Lawv txoj kev xav tau piav qhia txog kev xav thiab kev tshwm sim hauv ib tus neeg. Cov kws tshawb fawb tham txog dab tsi? Yuav ua li cas cov kev paub piav qhia hauv qhov kev xav no tuaj yeem siv tau?. Kawg hloov kho: 2023-12-17 05:12

Cov dej hauv av: hom thiab lawv cov yam ntxwv

Puas muaj dej hauv av? Tau kawg yog! Nws los ntawm atmospheric nag lossis daus, tus nqi ntawm uas nyob ntawm tej yam kev mob meteorological thiab kev nyab xeeb ntawm ib cheeb tsam. Kev tswj hwm dej ntawm cov av yog cov yam ntxwv tseem ceeb tshaj plaws uas txiav txim siab cov xwm txheej rau kev tsim khoom thiab kev loj hlob ntawm tsob ntoo cog. Kawg hloov kho: 2023-12-17 05:12

Caum siab yog qhov tseem ceeb ntawm cov nroj tsuag lub neej

Caum siab yog qhov tseem ceeb rau txhua yam nroj tsuag uas muaj nyob hauv qhov xwm txheej. Qhov no yog vim qhov tseeb tias lawv tsis muaj cov kua txiv hmab txiv ntoo, raws li kev txav ntawm cov ntshav hauv cov leeg ntawm cov kab mob tsiaj. Lub siab hauv cov hauv paus hniav ua rau cov kua txiv txav mus rau hauv "lub cev" ntawm cov nroj tsuag. Hauv tsab xov xwm no, peb yuav saib seb lub hauv paus siab txhais li cas, nws lub luag haujlwm hauv cov nroj tsuag lub neej yog dab tsi. Kawg hloov kho: 2023-12-17 05:12

Organosilicon tebchaw: piav qhia, kev npaj, khoom thiab daim ntawv thov

Organosilicon tebchaw: kev piav qhia dav dav, kev faib tawm, piv txwv ntawm cov tshuaj. Cov khoom siv tshuaj lom neeg. Cov yam ntxwv ntawm siab molecular hnyav organosilicon tebchaw. Txais thiab tsom xam. Daim ntawv thov nyob rau hauv ntau ceg ntawm tib neeg kev ua si. Ntau lawm nyob rau hauv Russia. Kawg hloov kho: 2024-01-02 17:01

Oscillatory motion: txhais thiab piv txwv

Nyob hauv lub neej txhua hnub, ib tug neeg tas li ntsib kev tshwm sim ntawm oscillatory motion. Qhov no yog lub viav vias ntawm lub pendulum nyob rau hauv lub moos, lub vibrations ntawm lub tsheb springs thiab tag nrho lub tsheb. Txawm tias av qeeg tsis muaj dab tsi tab sis kev vibrations ntawm lub ntiaj teb crust. Cov tsev siab siab kuj sway los ntawm cua daj cua dub. Cia peb sim seb yuav ua li cas physics piav txog qhov tshwm sim no. Kawg hloov kho: 2023-12-17 05:12

Kev paub tus qauv qauv: hom, kev faib tawm thiab cov txheej txheem ntawm daim ntawv thov

Ua tiav, tsim nyog sawv cev ntawm kev paub, uas pom qhov sib npaug ntawm tib neeg thiab tshuab, yog qhov teeb meem tseem ceeb ntawm kev sib pauv ntaub ntawv niaj hnub. Xws li kev sib pauv ntaub ntawv yog ua raws li cov txheej txheem ntawm cov tswv yim thiab kev sib raug zoo uas tsim kev paub. Kawg hloov kho: 2023-12-17 05:12

Harold Garfinkel - tus tsim ntawm ethnomethodology

Harold Garfinkel, kws kho mob hlwb, yug Lub Kaum Hli 29, 1917. Nws yog Tus Kws Tshaj Lij Tshaj Lij Tshaj Lij ntawm Sociology ntawm University of California, Los Angeles, qhov chaw nws tau ua haujlwm txij li xyoo 1954 mus txog thaum nws so haujlwm xyoo 1987. Nyob rau xyoo 1950 nws tau sau lo lus ethnomethodology. Kawg hloov kho: 2023-12-17 05:12

Chivkeeb yog ib lo lus tseem ceeb hauv biology thiab tshuaj

Lub tswvyim ntawm "genesis" yog siv nyob rau hauv rooj plaub uas koj yuav tsum hais txog lub hauv paus, lub hauv paus ntawm ib yam dab tsi. Lo lus "genesis" nyob rau hauv Lavxias teb sab los ntawm Greek genesis - tshwm sim, tsim thiab yog siv los ua ib feem ntawm cov lus sib xyaw denoting qhov ua rau yug ntawm phenomenon. Kawg hloov kho: 2023-12-17 05:12

Neurocomputer interface: lub hauv paus ntawm kev ua haujlwm, thaj tsam, qhov zoo thiab qhov tsis zoo

Maj mam, ntau yam tshiab los hauv peb lub neej. Txoj kev loj hlob ntawm thev naus laus zis tsis nyob twj ywm, thiab tag kis nws yuav ua tau dab tsi nag hmo peb tsis twv ua npau suav txog. Lub neurocomputer interface (NCI) ua rau muaj kev sib txuas ntawm tib neeg lub hlwb thiab thev naus laus zis, lawv cov kev cuam tshuam ib nrab. Kawg hloov kho: 2023-12-17 05:12

Cog cloning: cov kauj ruam, piv txwv, qhov zoo thiab qhov tsis zoo

Nroj cog qoob loo yog cov txheej txheem ntuj tsim uas yuav luag txhua tus neeg koom nrog hauv kev ua liaj ua teb thiab ua teb tau ua tiav. Muaj qhov sib txawv ntawm cov pa cloning thiab microcloning. Lawv cov theem muaj ntau txoj hauv kev zoo sib xws, tab sis txhua txoj kev muaj nws qhov zoo thiab qhov tsis zoo, uas peb yuav teev nyob rau hauv tsab xov xwm no. Kawg hloov kho: 2023-12-17 05:12

Mythological xav: ua rau, tshwj xeeb thiab peculiarities

Kev xav txog kev xav yog hom kev xav qub tshaj plaws. Nrog nws cov kev pab, ib tug neeg pib kawm cov xwm txheej, khoom thiab phenomena. Ua tsaug rau cov kev xav nplua nuj thiab kev ua me nyuam yaus ntawm cov neeg thaum ub, hauv lub txhab nyiaj piggy ntawm lub ntiaj teb mythology, koj tuaj yeem nrhiav tau ntau yam dab neeg nthuav thiab cov dab neeg thiab paub seb peb qhov kev xav ntawm lub ntiaj teb txawv npaum li cas los ntawm lub ntiaj teb saib ntawm peb cov poj koob yawm txwv. Kawg hloov kho: 2023-12-17 05:12

Qhov cuam tshuam ntawm lub suab rau tus neeg: piav qhia, qib, txiaj ntsig thiab kev puas tsuaj

Nrog kev loj hlob ntawm qhov loj ntawm lub nroog loj thiab cov kev lag luam loj, peb tau ntsib nrog cov tswv yim zoo li lub suab thiab suab nrov. Ntau tus tsis xav tias qhov cuam tshuam rau cov xwm txheej no muaj rau tib neeg kev noj qab haus huv. Tab sis qhov ua tsis zoo ntawm lub suab tsis tuaj yeem tsis quav ntsej. Kev paub yuav ua li cas los daws qhov tsis pom kev phom sij yog qhov tseem ceeb niaj hnub no. Kawg hloov kho: 2023-12-17 05:12

Dinosaurs thiab tib neeg: theories, facts and myths

Cov kws tshawb fawb ntseeg tias tus dinosaur kawg tuag 65 lab xyoo dhau los. Peb tau qhia qhov no hauv tsev kawm ntawv, tag nrho cov ntawv tshaj tawm txog kev tshawb fawb tseem ceeb rov hais dua qhov no. Tab sis puas yog tiag tiag? Vim li cas tus naj npawb ntawm cov kws tshawb fawb tau loj hlob txhua xyoo uas tau lees paub tias cov dinosaurs tuag ntau tom qab, thiab peb cov poj koob yawm txwv tseem pom cov tsiaj reptiles loj thiab tsis muaj mob?. Kawg hloov kho: 2023-12-17 05:12

Messenger RNA: qauv thiab lub luag haujlwm tseem ceeb

RNA yog ib qho tseem ceeb ntawm cov molecular genetic mechanisms ntawm lub cell. Cov ntsiab lus ntawm ribonucleic acids yog ob peb feem pua ntawm nws qhov hnyav qhuav, thiab kwv yees li 3-5% ntawm cov nyiaj no poob rau ntawm tus xa xov RNA (mRNA), uas yog koom ncaj qha rau hauv cov protein synthesis, pab txhawb rau kev siv cov genome. Kawg hloov kho: 2023-12-17 05:12

Qauv thiab kev ua haujlwm ntawm DNA thiab RNA ( rooj)

Nws paub zoo tias txhua yam kev muaj sia nyob, los ntawm cov kab mob mus rau cov tsiaj uas muaj kev sib koom siab (xws li tib neeg), muaj cov cuab yeej cuab tam tshwj xeeb. Nws yog sawv cev los ntawm molecules ntawm ob hom nucleic acids: deoxyribonucleic thiab ribonucleic. Nyob rau hauv cov organic tshuaj, cov ntaub ntawv yog encoded, uas yog kis los ntawm niam txiv cov neeg mus rau cov xeeb leej xeeb ntxwv thaum yug me nyuam. Kawg hloov kho: 2023-12-17 05:12

Copper(I) acetylenide: kev npaj thiab khoom

Tooj liab acetylenide yog ib qho derivative ntawm acetylene uas hydrogen atoms hloov los ntawm tooj liab atoms. Raws li nws cov khoom, qhov sib xyaw no yog ntsev ntawm cov kua qaub heev - acetylene. Tooj liab (I) acetylide, zoo li feem ntau cov hlau derivatives ntawm acetylene, yog tawg. Kawg hloov kho: 2024-01-02 17:01

Pentene isomers: qauv, daim ntawv thov, kev phom sij rau kev noj qab haus huv

Pentenes yog hydrocarbons nrog cov qauv molecular C5H10, saturated acyclic hydrocarbons ntawm chav kawm alkane. Lawv muaj tsib carbon atoms nyob rau hauv lub molecule (los ntawm lwm yam Greek πέντε - tsib). Isopentane muaj cov nyhuv narcotic. Hazard chav kawm plaub. Kawg hloov kho: 2024-01-18 04:01

Nikola Tesla: zais cia, biography, inventions thiab achievements hauv science

Lub ntiaj teb tej zaum yuav tsis paub txog tag nrho cov lus zais ntawm Nikola Tesla. Thiab txog niaj hnub no, cov kws tshawb fawb tab tom sim nthuav tawm cov lus zais cia tom qab nws. Peb paub tias tus kws tshawb fawb zoo tau ua haujlwm li cas; Nws kuj tseem paub tias tsis yog tag nrho nws tej hauj lwm tau luam tawm, thiab qee qhov, raws li nws ntseeg, tus sau tau rhuav tshem nrog nws txhais tes. Vim li cas tus txiv neej no tseem ceeb heev rau keeb kwm ntawm peb lub ntiaj teb? Cia peb saib nws biography. Kawg hloov kho: 2023-12-17 05:12

Osteons lossis Haversian system

The Haversian system tau txais nws lub npe los ntawm tus kws kho mob Askiv npe hu ua Clopton Havers (1657-1702), uas paub txog nws qhov kev tshawb fawb thawj zaug rau hauv kev tshuaj ntsuam xyuas cov qauv ntawm cov pob txha thiab pob qij txha. Nws yog thawj tus neeg piav qhia txog Charpy fibers. Kawg hloov kho: 2023-12-17 05:12

Txiv kab lus tsis yog kab lus

Lwm tus neeg cov lus qhia txog yuav ua li cas thiaj li ua tiav lub hom phiaj yog qee zaum tseem ceeb heev: txoj hauv kev kom raug thiab tsim nyog los daws qhov teeb meem yog txiav txim siab. Hauv kev ua haujlwm tshaj lij, qee zaum kuj tseem yuav tsum sab laj nrog cov npoj yaig, tshwj xeeb tshaj yog thaum daws teeb meem kev noj qab haus huv lossis lub neej ntawm tus neeg siv khoom. Kawg hloov kho: 2023-12-17 05:12

Aberration: nws yog dab tsi thiab lo lus no siv nyob qhov twg?

Qee nqe lus yuav muaj txiaj ntsig zoo hauv kev tshawb fawb thiab hauv tib neeg, thiab qee zaum txawm nyob hauv lub neej txhua hnub. Ntawm lawv muaj ib lo lus nrog ib tug stunningly yooj yim thiab to taub lub ntsiab lus - aberration. Lo lus no yog dab tsi thiab nws lub ntsiab lus tseeb yog dab tsi? Peb yuav sim nkag siab qhov no, thiab tseem xav txog nws lub ntsiab lus hauv qee qhov kev qhuab qhia. Kawg hloov kho: 2023-12-17 05:12

Black-Scholes mis: txhais, kev tshawb fawb txoj kev thiab xam piv txwv

Tus Dub-Scholes Option Pricing Model (OPM) yog tus qauv uas txiav txim siab tus nqi theoretical ntawm European xaiv, txhais tau hais tias yog tias cov cuab yeej cuab tam raug pauv hauv khw, ces tus nqi xaiv rau nws implicitly twb teem los ntawm lub ua lag luam nws tus kheej. Kawg hloov kho: 2023-12-17 05:12

Lithium isotope: txhais thiab daim ntawv thov

Isotopes ntawm lithium: lawv qhov ntau thiab cov lus piav qhia. Ntuj thiab dag isotopes. Cov yam ntxwv tseem ceeb. Nuclear cov tshuaj tiv thaiv nrog lithium isotopes. Lub layout ntawm lub nuclei. Cov txheej txheem rau kev sib cais ntawm lithium isotopes thiab lawv daim ntawv thov nyob rau hauv ntau yam lag luam. Kawg hloov kho: 2024-01-02 17:01

Bayesian tes hauj lwm: txhais, piv txwv thiab lawv ua haujlwm li cas

Bayesian network (lossis Bayesian network, kev ntseeg network) yog ib qho qauv tsim qauv, uas yog cov txheej txheem sib txawv thiab lawv qhov kev cia siab rau raws li Bayes. Raws li txoj cai, Bayesian network yog ib daim duab qhia acyclic, txhua qhov vertex uas sib haum mus rau qhov sib txawv ntawm qhov sib txawv, thiab cov arcs ntawm daim duab encode kev ywj pheej kev sib raug zoo ntawm cov kev sib txawv no. Kawg hloov kho: 2023-12-17 05:12

Aluminium hydrochloride: tshuaj muaj zog, txoj kev tau txais, cuam tshuam rau lub cev, daim ntawv thov

Aluminium hydrochloride yog ib tug tswv cuab ntawm ib pab pawg ntawm cov ntsev txhuas tshwj xeeb uas qhia cov tshuaj formula. Cov tshuaj no nquag siv nyob rau hauv niaj hnub cosmetology, nyob rau hauv antiperspirants thiab deodorants. Nws kuj pom nws daim ntawv thov ua coagulant hauv cov khoom siv uas ntxuav cov dej. Kawg hloov kho: 2023-12-17 05:12