AIMS To compare the efficacy of salbutamol delivered by metered dose inhaler (MDI), jet nebuliser, and ultrasonic nebuliser in ventilated infants with chronic lung disease. METHODS Twenty preterm ventilated infants with chronic lung disease were enrolled in two studies. In study 1 (n = 10), each infant was given 200 micrograms of salbutamol at 4 hour intervals and in random sequence from a me...

results although the antibacterial effect of 16 ppm aqueous ozone using a manual technique had an insufficient effect, its ultrasonic application technique resulted in complete disinfection in the root canals. conclusions the bactericidal activity of high concentration of aqueous ozone combined with ultrasonic application technique showed efficacy similar to that of 5.25% naocl in root canals. ...

background: ultrasonic vibrations are used to remove a cemented post from a root canal requiring endodontic retreatment. various results have been reported from the studies that evaluated the effect of ultrasonic instruments in removing the posts cemented with resin cements. the aim of this study was to evaluate the effect of ultrasonic energy on the retention of prefabricated metal post cement...

This paper describes the implementation of short range Object detection and distance measurement device with sensors for blind people. By using an ultrasonic transducer pair for producing ultrasonic sounds and sensing the reflected sound waves, the obstructions (objects) are detected. Distance measurement is used in a large number of applications such as robotic movement control, vehicle contro...

Constraints and features useful for an effective and easy to learn human sonar device are described. These include matching spatial cues generated by the device to those in the world. Techniques used by natural echolocators, including specifications of signal type, emitter, and receiver are briefly reviewed, as is techniques of converting ultrasonic signals to the audible range and techniques f...

Capacitive micromachined ultrasonic transducers ~CMUTs!, introduced about a decade ago, have been shown to be a good alternative to conventional piezoelectric transducers in various aspects, such as sensitivity, transduction efficiency, and bandwidth. In this paper, we discuss the principles of capacitive transducer operation that underlie these aspects. Many of the key features of capacitive u...

In 1988, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control (TUFFC) hosted a Special Issue Ultrasound Exposimetry (vol. 35, no. 2). This issue is now recognized as seminal; it laid the groundwork for development of numerous domestic international standards that are still widely used calibration regulatory characterization ultrasound devices. Since then, medical has undergon...