BACKGROUND Changing the fuel supply from petroleum based ultra-low sulfur diesel (ULSD) to biodiesel and its blends is considered by many to be a viable option for controlling exposures to particulate material (PM). This is critical in the mining industry where approximately 28,000 underground miners are potentially exposed to relatively high concentrations of diesel particulate matter (DPM). T...

In the refrigerator compressors, the suction mufflers are commonly used to reduce the notse propagated through the intake valve system. In order to optimize the muffler design, it is necessary to characterize the source characteristics, i.e., the source impedance and the strength, of the intake system. In this paper, assuming the intake system as one-port, linear, time-invariant one, the acoust...

RÉSUMÉ. L’objectif de ce travail est de calculer l’atténuation acoustique dans un pot d’échappement contenant des tubes perforés. On se place en régime harmonique et en absence d’écoulement, ceci nous amène à résoudre l’équation de Helmholtz. L’utilisation de techniques d’homogénéisation, nous permettent de prendre en compte la présence des tubes perforés à l’aide de condition d’impédance équiv...

Trends Light fossil fuel vehicles are now turning to electricity. The electric vehicle transition begins with a hybrid car. Hybrid uses an internal combustion engine as generator. Controller systems, driving safety and entertain light growing so that they consume lot of electricity, Safe devices lifestyle support. An additional battery charging system for car is being developed by the automotiv...