نتایج جستجو برای: 20 khz
تعداد نتایج: 619329 فیلتر نتایج به سال:
Background and Objective: Ultrasonic disintegration is a pretreatment process before stabilization and dewatering that degrades sludge and changes its physical and chemical characteristics. The aim of this study was to investigate the effectiveness of ultrasonic in enhancing hydrolyses, stabilization and dewatering of municipal raw activated sludge. Materials and Methods: The samples were tak...
Despite increasing use of intermediate frequency (IF) magnetic fields (MFs) in occupational and domestic settings, scientific evidence necessary for health risk assessments of IF MF is insufficient. Male and female Crl:CD(SD) rats (12 per sex per group) were exposed to 20 kHz, 0.20 mT(root mean square, rms) or 60 kHz, 0.10 mT(rms) sinusoidal MFs for 22 h day(-1) for 14 days (acute) or 13 weeks ...
Today ultrasonic power technique is consider a mandatory which always entered in many processes such as metal and plastic welding to overcomes issues, with aided of applying force (pressure) supplied high frequency vibration, solid-state weld can be generated by technique. That give the ability join not only small components, whereas also thicker specimens, depend on proper control matching con...
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