2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Thaum cov pob txha tawg tshwm sim hauv cov khoom tom qab cov yas deformation, void nucleation, void loj hlob, thiab void coalescence tshwm sim microscopically hauv cov khoom (Dodd thiab Bai, 1987); cov khoom deteriorates thaum lub sij hawm yas deformation vim voids.
Nyob hauv qhov teeb meem dab tsi tshwm sim?
Nyob hauv qhov teeb meem dab tsi tshwm sim? Kev piav qhia: Cov pob txha tawg tshwm sim hauv trans granular yam thaum lub pob tawg tawg hauv kev puas tsuaj. Kev piav qhia: Cov dav hlau nrog rau qhov kev puas tsuaj tshwm sim hauv cov hlau yog hu ua lub dav hlau cleavage. Nplai thiab ntxaib dav hlau yog nyob rau hauv uas slipping thiab twinning yog nyiam.
Vim li cas cov hlau ua rau cov pob txha tawg?
Cov pob txha tawg hauv cov hlau thiab hlau alloys feem ntau tshwm sim los ntawm pib, kev loj hlob, thiab kev sib koom ua ke ntawm cov khoom siv hluav taws xob tsis zoo thaum lub sij hawm yas deformation [1–6]. … Thaum cov voids nucleate, ntxiv cov yas deformation ua rau qhov loj ntawm cov voids thiab distors cov duab, uas feem ntau hu ua void kev loj hlob [7].
Koj paub li cas ntawm qhov tawg tawg?
Cov pob txha tawg muaj cov yam ntxwv hauv qab no:
- Muaj ntau qhov kev ruaj khov lossis cov yas deformation hauv thaj tsam ntawm cov pob txha tawg. …
- Qhov saum npoo ntawm cov pob txha tawg tsis tas yuav cuam tshuam nrog kev coj ntawm lub ntsiab tensile kev nyuaj siab, raws li nws yog nyob rau hauv ib tug nkig puas.
hom kev ua tsis tiav li cas hauvCov khoom siv ductile thiab brittle?
Corrosionpedia Piav Qhia Qhov Tsis Ua Haujlwm
Yuav luag txhua cov ntaub ntawv engineering tsuas yog ob hom kev ua tsis tiav / tawg hom: zawm thiab tawg tawg. Cov ntaub ntawv pov thawj pom cov yas loj heev buckling lossis deformationpiv rau cov khoom tawg.
Pom zoo:
Thaum muab piv cov kab kab kab thiab cov kab ntsig flatworms qhov twg muaj tseeb?
Ib tug flatworm muaj nyias, dorsoventrally flattened lub cev. Roundworms yog ntau cylindrical hauv cov duab thiab tapered mus rau qhov zoo ntawm ib kawg. Ib yam li ntawd, cov kab mob roundworms muaj ib txheej txheej txheej hu ua cuticle uas lawv tau rov ua dua thoob plaws hauv lawv lub neej thiab thaum lawv loj hlob.
Cov kab kab kab kab kab ua kab mob txaus ntshai npaum li cas?
Nyob rau hauv peb thiab tom ntej instars ntawm lawv txoj kev loj hlob, Pine processionary caterpillars yog mob heev rau daim tawv nqaij ntawm tib neegthiab lwm yam tsiaj. Kev sib cuag yooj yim nrog cov plaub hau ntawm kab ntsig tuaj yeem ua rau pob khaus hnyav (urticaria) thiab khaus qhov muag, thiab qee tus neeg yuav muaj kev fab tshuaj.
Tus kab mob poxvirus twg yog tus kab mob tshwm sim?
Influenza (los yog mob khaub thuas) yog ib qho piv txwv ntawm tus kab mob tshwm sim uas tshwm sim vim yog ob qho tib si ntuj thiab tib neeg. Tus kab mob npaws yog qhov tsis zoo rau nws lub peev xwm los hloov nws cov ntaub ntawv caj ces. Cov kab mob tshwm sim yog dab tsi?
Thaum twg cov kab mob extraembryonic tshwm sim thawj zaug?
-Thawj tshwm sim lig hnub 3 raws li kev txuas ntxiv ntawm hindgut thiab txhim kho ntawm chorion thiab amnion. Lub lim tiam twg ua rau cov kab mob extraembryonic tsim? Lub sijhawm lub lim tiam thib peb, cov kab mob primordial, uas tshwm sim hauv extraembryonic mesoderm ze ntawm lub hauv paus ntawm allantois, ua kom pom tau hauv ob sab ntawm lub hnab yolk (saib daim duab.
Cov cim qhia twg thiab cov tsos mob tshwm sim los ntawm kev kis tus kab mob lewisite?
Qhov muag: khaus, mob, o, thiab tearing tuaj yeem tshwm sim ntawm kev sib cuag. Cov kab mob ua pa: hnoos, txham, hoarseness, ntshav qhov ntswg, mob sinus, ua tsis taus pa, thiab hnoos. Cov kab mob digestive: raws plab, xeev siab, thiab ntuav.
