Articles techniques et présentations

Metallic foams can be plastically deformed to dramatically alter the material’s mass density, microstructure, and bulk mechanical properties. This work investigates the plastic deformation of open-cell aluminum foams numerically, using high fidelity models of metallic foam constructed ... En savoir plus

For many decades Helium-3 (3He) and Argon gas filled detectors have been used for neutron and gamma detection. Detection requires the generation of electrons which can then be measured by electronic means. These electrons are generated either directly through gamma ionization of a gas ... En savoir plus

Waveguides are widely adopted for propagation of high frequency signals. Due to misalignment of waveguide system, bended or twisted waveguide is demanded for connection between waveguides. Compared with straight waveguides, twisted waveguides have a shift of cutoff frequency ... En savoir plus

Determining an optimal port profile for a vented loudspeaker is still an unsolved problem. Studies that measured distortion content suggest a gently flared port is best, while subjective listening tests suggest that more aggressive flare rates are optimal at low to moderate levels, but ... En savoir plus

Printed circuit heat exchanger (PCHE) is a key component in many energy and power systems, such as concentrated solar power plant, nuclear power plant, aircraft, etc. In this paper, the thermal and fluid performance of a lab-scale PCHE is analyzed using COMSOL Multiphysics® simulation ... En savoir plus

Directional couplers are used for the purpose of redirecting, splitting, and combining light in silicon photonic circuits. They are used extensively in data communication applications such as wavelength-division-multiplexing and signal switching [1]. Their functionality is an integral ... En savoir plus

High-powered solid-state lighting uses ceramic materials for conversion of impinging blue pump light into bright longer-wavelength luminescence. This luminescence combines with an unconverted portion of the blue pump light to provide a white light spectrum. As the conversion efficiency ... En savoir plus

In this work, linear and spot Fresnel lenses, designed by an earlier study of the authors, are prototyped in four methods; two mold-free prototypes made by 3D printing and acrylic CNC machining, and two mold-based prototypes made by acrylic casting and hot embossing. The purpose is to ... En savoir plus