Ultrasound yog ib hom elastic mechanical yoj hauv cov khoom nruab nrab.Nws yog ib daim ntawv yoj.Yog li ntawd, nws tuaj yeem siv los txheeb xyuas cov ntaub ntawv physiological thiab pathological ntawm tib neeg lub cev, uas yog, kuaj ultrasound.Nyob rau tib lub sijhawm, nws kuj yog ib hom ntawm lub zog.Thaum ib koob tshuaj ntawm ultrasound propagates nyob rau hauv cov kab mob, los ntawm lawv cov kev sib cuam tshuam, nws yuav ua rau kev hloov nyob rau hauv lub functionality thiab cov qauv ntawm cov kab mob, uas yog, cov nyhuv ultrasonic.

Cov teebmeem ntawm ultrasound ntawm cov hlwb feem ntau suav nrog cov nyhuv thermal, cov nyhuv cavitation thiab cov nyhuv mechanical.Cov nyhuv thermal yog tias thaum ultrasound propagates nyob rau hauv nruab nrab, qhov kev sib txhuam cuam tshuam lub molecular kev co tshwm sim los ntawm ultrasound thiab converts ib feem ntawm lub zog mus rau hauv lub zos kub kub (42-43 ℃).Vim tias qhov ntsuas kub tseem ceeb ntawm cov ntaub so ntswg ib txwm yog 45.7 ℃, thiab qhov rhiab heev ntawm Liu cov ntaub so ntswg yog siab dua li cov ntaub so ntswg ib txwm muaj, cov metabolism hauv o Liu hlwb cuam tshuam rau qhov kub thiab txias, thiab cov synthesis ntawm DNA, RNA thiab protein cuam tshuam. , Yog li tua cov qog nqaij hlav cancer tsis cuam tshuam rau cov ntaub so ntswg.

Cavitation nyhuv yog tias nyob rau hauv ultrasonic irradiation, vacuoles yog tsim nyob rau hauv cov kab mob.Nrog rau kev vibration ntawm vacuoles thiab lawv qhov hnyav tawg, txhua yam shear siab thiab turbulence yog generated, uas ua rau o Liu los ntshav, cov ntaub so ntswg disintegration thiab necrosis.

Tsis tas li ntawd, thaum lub cavitation npuas tawg, nws ua rau kub kub (txog 5000 ℃) thiab siab siab (txog 500 ℃) × 104pa), uas tuaj yeem tsim los ntawm thermal dissociation ntawm dej vapor OH radical thiab H atom, los ntawm OH radical thiab redox cov tshuaj tiv thaiv tshwm sim los ntawm H atom tuaj yeem ua rau polymer degradation, enzyme inactivation, lipid peroxidation thiab cell tua.


Lub sij hawm xa tuaj: Mar-10-2022