Ultrasonic pulsed wave range Doppler sensors provide application in various fields, e.g. intruder alarm systems or autonomous vehicle steering, [1], [2], [3]. The timefrequency methods [4, 5] commonly used in these sensors, however, inhere the problem that, due to the transducer's non constant and direction-dependent transfer functions, the Doppler frequency cannot be determined with high accur...

This paper explores the use of acoustics for manipulation of bioparticles. A series of experimental studies were conducted using acoustic standing waves in resonant cavities as means of trapping bioparticles and enhancing bioparticles separation. Parallel Plane Cavity was explored. The effect of cell size and host media concentration on trapping efficiency, trapping time and velocity were inves...

This paper presents the results of an experimental study on the effects of elevated temperature on compressive and flexural strength of Normal Strength Concrete (NSC), High Strength Concrete (HSC) and High Performance Concrete (HPC). In addition, the specimen mass and volume were measured before and after heating in order to determine the loss of mass and volume during the test. In terms of non...

Dynamic modulus of elasticity was determined in clearwood samples of eight tropical hardwood species using longitudinal vibrations, flexural vibration and ultrasonic transit-time methods. These samples were subsequently subjected to three point static bending test to determine static modulus of elasticity and modulus of rupture. Acoustic velocity and wood density were found to be independent pa...

Non-destructive testing by ultrasounds has been widely used to characterize cementitious materials. Ultrasonic techniques allow estimating mechanical properties of these materials by measuring both velocity and attenuation of the propagating ultrasonic pulse. In this study, both content and size of aggregates in mortar specimens are estimated by taking into account an optimization formulation w...