Keeb kwm ntawm cov kaus poom txhuas
Cov kaus poom ntim npias thiab dej haus uas ua los ntawm hlau muaj keeb kwm ntau tshaj 70 xyoo. Thaum xyoo 1930s, Tebchaws Meskas tau pib tsim cov kaus poom hlau npias. Lub kaus poom peb daim no yog ua los ntawm tinplate. Sab saud ntawm lub cev lub tank yog lub khob hliav qab, thiab sab saud yog lub hau kaus poom zoo li lub kaus mom. Nws qhov tsos tsis txawv ntawm cov fwj iav, yog li cov kab ntim fwj iav tau siv rau kev ntim thaum pib. Nws tsis yog txog thaum xyoo 1950s uas muaj kab ntim tshwj xeeb. Lub hau kaus poom tau hloov mus ua lub duab tiaj tiaj hauv nruab nrab xyoo 1950s thiab tau txhim kho mus ua lub hau txhuas hauv xyoo 1960s.
Cov kaus poom dej haus txhuas tau tshwm sim thaum ntxov xyoo 1950s, thiab cov kaus poom DWI ob daim tau tawm los thaum ntxov xyoo 1960s. Kev txhim kho cov kaus poom txhuas yog qhov ceev heev. Thaum kawg ntawm lub xyoo pua no, kev siv txhua xyoo tau mus txog ntau dua 180 billion, uas yog pawg loj tshaj plaws hauv ntiaj teb cov kaus poom hlau tag nrho (kwv yees li 400 billion). Kev siv txhuas siv los tsim cov kaus poom txhuas kuj tseem loj hlob sai. Xyoo 1963, nws ze rau xoom. Xyoo 1997, nws tau mus txog 3.6 lab tons, uas yog sib npaug rau 15% ntawm tag nrho kev siv ntawm ntau yam khoom siv txhuas hauv ntiaj teb.
Cov thev naus laus zis tsim khoom ntawm cov kaus poom txhuas tau raug txhim kho tas li.
Tau ntau xyoo lawm, cov thev naus laus zis tsim cov kaus poom txhuas tau raug txhim kho tas li. Qhov hnyav ntawm cov kaus poom txhuas tau raug txo qis heev. Thaum ntxov xyoo 1960, qhov hnyav ntawm txhua txhiab lub kaus poom txhuas (suav nrog lub cev kaus poom thiab lub hau) tau txog 55 phaus (kwv yees li 25 kilograms), thiab thaum nruab nrab xyoo 1970 nws tau poob rau 44.8 phaus (25 kg). Nws tau raug txo kom txog 33 phaus (15 kilograms) thaum kawg xyoo 1990, thiab tam sim no nws tau raug txo kom tsawg dua 30 phaus, uas yog ze li ib nrab ntawm 40 xyoo dhau los. Hauv 20 xyoo txij li xyoo 1975 txog 1995, tus lej ntawm cov kaus poom txhuas (12 ooj hauv peev xwm) ua los ntawm 1 phaus ntawm txhuas tau nce 35%. Ntxiv rau, raws li cov ntaub ntawv ntawm lub tuam txhab American ALCOA, cov khoom siv txhuas uas xav tau rau txhua txhiab lub kaus poom txhuas tau txo qis los ntawm 25.8 phaus hauv xyoo 1988 mus rau 22.5 phaus hauv xyoo 1998 thiab tom qab ntawd txo qis mus rau 22.3 phaus hauv xyoo 2000. Cov tuam txhab ua kaus poom Asmeskas tau ua tiav cov kev tshawb fawb hauv kev siv tshuab sealing thiab lwm yam thev naus laus zis, yog li qhov tuab ntawm cov kaus poom txhuas hauv Tebchaws Meskas tau txo qis ntau, los ntawm 0.343 hli hauv xyoo 1984 mus rau 0.285 hli hauv xyoo 1992 thiab 0.259 hli hauv xyoo 1998.
Kev nce qib ntawm kev sib dua ntawm cov hau txhuas kuj pom tseeb. Lub tuab ntawm cov hau txhuas tau poob qis los ntawm 039 hli thaum xyoo 1960s mus rau 0.36 hli hauv xyoo 1970s, los ntawm 0.28 hli mus rau 0.30 hli hauv xyoo 1980, thiab mus rau 0.24 hli hauv nruab nrab xyoo 1980s. Lub cheeb ntawm lub hau kuj tau txo qis. Qhov hnyav ntawm cov hau txhuas tau txuas ntxiv txo qis. Xyoo 1974, qhov hnyav ntawm ib txhiab lub hau txhuas yog 13 phaus, xyoo 1980 nws tau txo qis mus rau 12 phaus, xyoo 1984 nws tau txo qis mus rau 11 phaus, xyoo 1986 nws tau txo qis mus rau 10 phaus, thiab xyoo 1990 thiab 1992 nws tau txo qis mus rau 9 phaus thiab 9 phaus feem. 8 phaus, txo qis mus rau 6.6 phaus hauv xyoo 2002. Qhov ceev ntawm kev ua cov kaus poom tau zoo dua qub, los ntawm 650-1000cpm (tsuas yog ib feeb) hauv xyoo 1970 mus rau 1000-1750cpm hauv xyoo 1980 thiab ntau dua 2000cpm tam sim no.
Lub sijhawm tshaj tawm: Lub Kaum Ob Hlis-28-2021