2024 Tus sau: Priscilla Miln | [email protected]. Kawg hloov kho: 2024-02-18 01:26
Lub stopwatch yog ib yam khoom tshwj xeeb uas tuaj yeem ntsuas lub sijhawm kom raug, nqis mus rau ib feem ntawm ib pliag. Feem ntau lawv siv rau kev ntsuas nrog qhov tseeb ntawm 100th ntawm ib thib ob. Tam sim no lub sijhawm ntawm kev loj hlob ntawm cov thev naus laus zis niaj hnub tau los. Qhov no ua rau nws tuaj yeem ntsuas lub sijhawm kom raug raws li qhov ua tau.
History of stopwatches
Nws tag nrho pib nrog qhov tshwm sim ntawm cov neeg saib thaum ub, uas tau tshwm sim txij li lub sijhawm immemorial. Thaum xub thawj muaj sundials, ces siv dej, xuab zeb, thiab hluav taws. Tab sis lawv tau zoo rau kev paub kwv yees li cas nws yog lub sijhawm, tab sis tsis haum rau kev tau txais cov ntaub ntawv raug ntau dua. Kev ntsuas ntawm hom no ib txwm ua yuam kev ntawm ob peb feeb, thiab txawm tias mus txog 30 feeb.
Yog tias peb tham txog kev saib xyuas niaj hnub me ntsis, lawv tau tsim los ntawm Christian Huygens hauv xyoo 1657, uas yog keeb kwm los ntawm Holland. Tus neeg tsim khoom thawj zaug tuaj nrog lub tswv yim thiab pom nws nrog kev pab ntawm lub pendulum. Hauv thawj Huygens li, qhov yuam kev txhua hnub tsis txav ntau tshaj kaumvib nas this. Yog li maj mam cov evolution ntawm watches tshwm sim. Txawm li cas los xij, lawv tsis tuaj yeem phim lub moos nres txawm tias muaj tseeb.
Thaum cov khoom siv hluav taws xob pib tsim kho, qhov tshwm sim ntawm cov khoom siv hluav taws xob nres tau dhau los ua qhov laj thawj. Qhov kev tsim kho no tau dhau los ua cov cuab yeej nyiam rau cov chav kawm kev kawm lub cev rau cov chav kawm kev kawm lub cev. Yog li ntawd, peb tuaj yeem hais nrog kev ntseeg siab tias txhua tus tub ntxhais kawm paub txog cov cuab yeej no.
Ntxiv nrog rau kev txhim kho thiab kev sib kis ntawm cov khoos phis tawj, lub sijhawm nres tau hloov mus rau hauv cov haujlwm uas tuaj yeem ntsuas lub sijhawm ntev nrog qhov tseeb siab tshaj plaws. Muaj txawm tias online versions ntawm cov khoom siv.
Description of mechanical stopwatch SOPpr 2a 3 000
Cov khoom lag luam nres tau muaj lub hauv paus ntsiab lus ntawm kev ua haujlwm, nws yog ib leeg-tes. Kev ua hauj lwm ntawm lub internal mechanism yog cuam tshuam. Nrog nws, koj tuaj yeem ntsuas lub sijhawm yooj yim xws li: feeb, vib nas this thiab txawm tias feem ntawm ib thib ob.
Tus nqi ntawm kev faib nres yog 0.2 s. Qhov ntsuas ntawm no yog rau caum vib nas this. Tsis tas li ntawd, tus qauv yog nruab nrog peb caug-feeb txee, nws cov nqi faib yog ib feeb.
Qhov peculiarity ntawm cov cuab yeej yog tias nws muaj 15 ruby pob zeb, lub caliber yog 42 hli. Cov neeg tsim khoom kuj tau teeb tsa lub caij nplooj ntoos hlav-hom cav rau ntawm lub thauj tog rau nkoj stroke thiab oscillatory tshuav nyiaj li cas. Raws li lub sijhawm oscillation, nws yog 0.4 vib nas this.
txhawm rau ua kom yooj yim rau tus neeg siv los tswj cov xub, cov neeg tsim khoom tau nruab lub tshuab nres tsheb SOPpr 2a 3 000 nrog lub zog tshwj xeeb-hom ntaus ntawvyooj yim ua. Txhawm rau pib lub tshuab, nrog rau nres lossis rov qab cov xub mus rau xoom, koj yuav tsum nias lub taub hau winding ua ntu zus. Nyob rau tib lub sijhawm, cov neeg kho tshuab nres nres SOPpr 2a 3 000 ua haujlwm ntawm ib lub caij nplooj ntoo hlav rau kwv yees li kaum yim teev. Cov cuab yeej (dial) yog them nrog txheej txheej xim dawb, thaum txhais tes thiab cov lej yog xim dub.
Raws li qhov tseeb ntawm cov qauv no, nws yog qhov thib peb. Rau peb caug feeb, qhov yuam kev me me ntawm ± 1.6 tau tso cai. Lub sijhawm nres tuaj yeem ua haujlwm ntawm qhov kub ntawm -20 degrees Celsius txog +40.
Qhov zoo ntawm cov cuab yeej piav qhia
Cov txiaj ntsig hauv qab no ntawm kev piav qhia nres tuaj yeem paub qhov txawv:
- nws muab kev tswj lub sijhawm tswj;
- moos ua haujlwm cuam tshuam yog tias tsim nyog;
- vim qhov tseeb tias qhov no ib-khawm stopwatch yooj yim heev rau siv;
- sijhawm nrog cov cuab yeej zoo li no ntsuas tsis yog hauv vib nas this, tab sis kuj yog feeb thiab txawm tias feem ntawm ib thib ob;
- ua tsaug rau lub pob zeb ruby, nws muaj peev xwm ua tiav cov ntaub ntawv siab tshaj plaws;
- device ua haujlwm nrog lub caij nplooj ntoos hlav tag nrho yuav luag 19 teev, uas yog tus neeg siv khoom zoo;
- chrome-plated hlau rooj zoo li stylish thiab tiv thaiv kev puas tsuaj;
- Feem ntau, cov neeg muag khoom ntawm cov khoom siv hluav taws xob nres SOPpr 2a 3,000 muab cov neeg yuav khoom ib xyoos lav ntawm lub cuab yeej.
Raws li koj tuaj yeem pom, cov cuab yeej no muaj ntau yam zoo uas koj yuav nyiam.
Lub moos nres siv nyob qhov twg?
Tam sim no, SOPpr 2a 3000 mechanical stopwatches yog siv rau hauv qab no:
- Nyob hauv kev cob qhia kis las, yog tias peb tsis tham txog kev ua kis las. Cov cuab yeej tsim nyog txhawm rau ntsuas lub sijhawm ntev ntawm tus neeg ncaws pob kom kov yeej qhov deb thiab lwm yam.
- Nyob hauv lub Hoobkas thiab cov chaw tshawb fawb.
- Nyob hauv chav kuaj ntawm cov tsev kawm ntawv, tsev kawm qib siab, tsev kawm txuj ci thiab lwm lub tsev kawm ntawv.
Tsis tas li, cov cuab yeej siv los ntawm ntau tus niam tsev hauv lub neej txhua hnub. Koj tsis tuaj yeem ua yam tsis muaj nws hauv kev ua tub rog, thaum tsim nyog, piv txwv li, txhawm rau txheeb xyuas lub sijhawm ya davhlau ntawm qhov projectile txhawm rau ntsuas lub sijhawm ntaus lub hom phiaj.
Lub stopwatch yog qhov tseem ceeb ntawm ntau tus neeg lub neej. Ua tsaug rau qhov kev tsim kho no, lub neej tuaj yeem hloov kho thiab koj tuaj yeem nkag siab tias nws siv sijhawm ntau npaum li cas.
Pom zoo:
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Hnub no, ib qho ntawm cov txheej txheem nrov tshaj plaws yog intracytoplasmic phev txhaj. Nws yog ib feem ntawm IVF. Hauv tsab xov xwm no, peb yuav txiav txim siab seb ICSI yog dab tsi, peb tseem yuav kawm cov kev tshuaj xyuas, thiab tseem kov cov ntsiab lus ntawm kev npaj rau cov txheej txheem thiab qhov tshwm sim
