Award Data

A HYBRID POWER PLANT, CONSISTING OF A DIESEL GENERATOR, A BATTERY FOR ENERGY STORAGE, A PHOTO-VOLTAIC ARRAY OR OTHER RENEWABLE ENERGY SOURCE, AND AN INVERTER/BATTERY CHARGER, WILL BE ECONOMICALLY FEASIBLE IN THE NEAR FUTURE BOTH WITHIN THE UNITED STATES AND THROUGHOUT THE DEVELOPING WORLD WHERE RURAL AREAS ARE STARVING FOR QUALITY POWER. AT PRESENT DIESEL GENERATORS RUN CONTINUOUSLY; THE NEW HYBR ...

The excitation of structural vibrations by turbulent boundary layer surface pressure fluctuations is an important problem in underwater acoustics. A capability for accurately characterizing these fluctuations, especially the low wavenumber components of the spectrum, is needed to determine the effect of the pressure fluctuations on the excitation of structural vibrations. This capability may also ...

The proton exchange membrane (PEM) fuel cell is being considered as power source for a variety of applications (1-4). Gravimetric and volumetric energy density, life cycle costs, ease and safety of operation are major considerations which may favor a PEM fuel cell power source over batteries. The proposed PEM fuel cell power source relies on an assembly of series connected cells arranged on boar ...

APA Optics will develop a monolithic UV seeker for use in flame sensing and passive or tactical threat warning systems. The key to the technical approach is the deposition of high optical/electrical quality Al(x)Ga(1-x)N over GaAs substrates and using it to fabricate back to back Schottky barrier detectors. Al(x)Ga(1-x)N is a compound III/V semiconductor system with a bandgap tunable from 220 to 3 ...

We propose a six month Phase I program to demonstrate the feasibility of growing A1N single crystals to serve as substrates for subsequent A1xGa1xN epitaxy. Our approach is to use a low pressure, high temperature (>>2000oC) furnace with a temperature gradient between the A1N charge and the deposition (seed) regions. Our approach is based on several innovations. These include the use of single prec ...

High voltage semiconductor devices have found important applications in the areas of high power generation, power control, power conversion, surge protection, and industrial electronics. However, GaAs or Si based high voltage device are limited by a relatively low intrinsic breakdown voltage and,therefore, inherently suited for high power applications. We propose to develop novel high voltage hete ...

We propose a six month Phase I research program aimed at developing compliant substrates for the epitaxy of GaN and AlGaN films. We present two alternate approaches one with silicon and the other with GaAs as the starting substrate material and a unique multilayer structure to be deposited using low pressure MOCVD. We propose to investigate an approach based on the use of SIMOX substrates. These c ...

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This proposal describes a new approach to laser diode drivers which combines the unique advantages of three key technologies. The innovative approach will extend the performance capabilities of laser diode systems to greater than 200 A peak pulse current, less than one nanosecond rise time, at greater than 10 KHz repetition rates. Not customarily used in laser diode drivers, the unique combinati ...

The use of metal/semiconductor (M/SC) interfaces, in the form of SC coatings on metal, is a new anti-corrosion technology based on creating an electronic barrier, through an intrinsic electric field, to the transfer of electrons from a metal substrate to oxidizing species such as oxygen in the environment. The present work seeks to implement this technology with new, soluble, semiconducting organ ...