Antenne Satellites Double-Grille a Polarisation Circulaire

Certaines antennes appelees antennes a reflecteur double-grille sont actuellement utilisees sur des satellites. Ces refiecteurs sont constitues de deux grilles paraboligues placees I’une derriere I’autre. Ces grilles sont orthogonales, c’est-a-dire que la premiere r6flechit les andes polarisees verticalement et est transparente pour les ondes polarisees horizontalement, alors que la deuxieme fait I’inverse. De cette maniere, […]

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Emissions control and reduction for natural gas engines

The use of natural gas as a fuel for on-road commercial vehicles offers significant benefits, including lower greenhouse gas emissions. Methane, the main component of natural gas, has many virtues as a fuel. One of these benefits is that it is a very stable molecule. This stability does introduce a challenge: it is hard to […]

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Development of an Advanced Communication Earplug

To prevent noise-induced hearing loss, at the workplace just like in everyday’s life, an Advanced Communication Earplug (ACE) will be designed. This ACE will merge hearing protection features usually found in industrial protectors and modern communication capabilities that can be found in consumer products such as in-ear headphones and hands-free communication headsets, into one in-ear […]

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