Technical Papers and Presentations

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 ... Read More

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 ... Read More

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 ... Read More

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 ... Read More

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 ... Read More

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 ... Read More

We here present a Computational Fluid Dynamics (CFD) model performed with COMSOL Multiphysics® simulation software as part of a collaboration with the Polarized Target Research Group at the University of New Hampshire (http://nuclear.unh.edu/research/polarized-target-lab/). By coupling ... Read More

In his seminal work, “A Chemical Basis for Morphogenesis,” Alan Turing proposed a mechanism for pattern formation in nature. Turing patterns occur in a broad range of natural systems, from desert vegetation to animal markings. Turing mechanisms have also been implicated in processes ... Read More

HVDC electrodes are installed on HVDC transmission systems to provide a low resistance current return path during both monopolar and bipolar operation, using the earth and/or sea as the conductive medium. HVDC electrodes are in general less costly and have lower losses than dedicated ... Read More

Microwave plasma sources with a resonant cavity have been widely used in microwave electrothermal thrusters as an electric propulsion device, in which free-floating plasma is ignited and sustained in a propellant gas. The resonant cavity microwave plasma has become increasingly ... Read More