Abstract Air bubble plume flow has been applied widely in the dredging, ice breaking, and pollution control at navigation projects. But interaction regimes among bubbles or between water are not quite clear. Especially open channels, significantly affected by separation phenomenon which is caused cross velocity. According to existing research, force of gas-liquid distribution size key parameter...

̶ The use of airborne ultrasonic transducers for wireless communication was demonstrated. The work used capacitive ultrasonic transducers to transmit coded binary signals through parallel air channels. On-Off Keying modulation was successfully implemented in the system. Within the limited bandwidth of the transducers, six channels were used at frequencies from 50 kHz to 110 kHz with a channel sp...