Evaluation of four common electronic mosquito repellers on Aedes albopictus and Culex pipiens.

Introduction: Mosquitoes represent a way of spreading infectious diseases, as vectors of pathogens. Many types of ultrasonic devices have recently been promoted as effective and suitable alternatives to the use of biocides known as toxic to humans and environment.

Materials And Methods: Four ultrasonic mosquito repellers have been analysed and tested on females of two species, Culex pipiens and Aedes albopictus, in laboratory conditions.

Stabilization of a - Sensor Mounted on a Vehicle for Measuring the Acoustic Impedance of Road Surfaces.

The knowledge of the acoustic impedance of a material allows for the calculation of its acoustic absorption. Impedance can also be linked to structural and physical proprieties of materials. However, while the impedance of pavement samples in laboratory conditions can usually be measured with high accuracy using devices such as the impedance tube, complete in-situ evaluation results are less accurate than the laboratory results and is so time consuming that a full scale implementation of in-situ evaluations is practically impossible.

Lamb waves propagation along 3C-SiC/AlN membranes for application in temperature-compensated, high-sensitivity gravimetric sensors.

The propagation of the fundamental quasi-symmetric Lamb mode S(0) travelling along 3C-SiC/c-AlN composite plates is theoretically studied with respect to the AlN and SiC film thickness, the acoustic wave propagation direction and the electrical boundary conditions. The temperature effects on the phase velocity have been considered for four AlN/SiC-based electroacoustic coupling configurations, specifically addressing the design of temperature-compensated, enhanced-coupling, GHz-range electroacoustic devices. The gravimetric sensitivity and resolution of the four temperature-stable SiC/AlN composite structures are theoretically investigated with respect to both the AlN and SiC sensing surface.