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Encyclopedia of Smart Materials (Vols 1 and 2) - M. Schwartz (2002) Episode 9

Tham khảo tài liệu 'encyclopedia of smart materials (vols 1 and 2) - m. schwartz (2002) episode 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Figure 1. The influence of ultrasonic noise on the Norway rat population. Figure 1 shows the effect of treatment on the Norway rat. Figure 2 shows the effect of the treatment on wild house mice. The influence on both populations is most significant for food consumption. The tracking activity of the wild house mice is not heavily influenced by the ultrasonic effect. The rodents hearing was checked before and after the testing. Only rodents that had good hearing were selected for the study. It has been postulated that the rodents might eventually become accustomed to the noise but this was not the case. There were instances where rodents were not influenced but this was due to hearing loss. The sound patterns frequency and amplitude of four of the pace electronic pest repeller units were measured. Days Figure 2. The influence of ultrasonic treatment on the wild house mice population. struments but killing microorganisms is no high-temperature sterilization. The erosive tation is what is useful in removing a var scales. Cavitation is caused when the loca drops below the fluid vapor pressure. This r tating bubbles. The collapse of cavitating bubbles is acc rapid release of energy. It is the collapse ing bubbles that is used to destroy microor not clear whether the microorganism popul diately killed by the bubble collapse or if th just weakened enough to limit its viability. The generation of cavitation is limited close to the pressure sound source. Cavitat plied to a large volume of fluid either by mov through the fluid or by moving the fluid p The application described here moves the source by pumping the volume through tu fairly even exposure of the liquid to the press does not sterilize the fluid but it does elim cant portion of the microorganism populatio The biological test results available indica tion does significantly reduce the population and diesel fuel but the effect varies for the ty ganisms tested. The population reduction is 50 . It is expected that .