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In order to realize the full potential of cryogenic power converters, it is vital to develop the technology for cryogenic capacitors and inductors, in order to be combined with the switching semiconductors. Capacitors with high dielectric constant and high voltage withstand at cryogenic temperatures with low weight and volume lie on the critical path. The proposed work focuses on innovative tech ...

Proposed is the technical development and design of the electronics and cooling systems for a 1 megawatt cryogenically cooled inverter suitable for use in a wide range of applications, including Uninterruptable Power Suplies (UPS) and motors in the +1000 HP range. The proposed work will provide a logical progression to the development that has already been done by American Superconductor Corp. I ...

This Phase I effort will ascertain the practical aspects of assemblin g a cost-effective, reliable, compact optical security system using phase-encryption of identification data in conjunction with phase- and/or amplitude-encoded biometric signatures and develop a preliminary design and demonstration plan for Phase II. For this Phase I effort, we will use fingerprints as the primary biometric iden ...

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To Operate effectively, PEM small fuel cells stacks need a chemical hydride hydrogen generator. The chemical hydride digital reactor suggested in the proposed program will provide about 2.5 kWH of energy in a5 pound package.--almost three times the energy density of a BA5590 battery. Studies and experiments will be conducted with spe ...

We propose to develop an inexpensive, high performance closed-cycle cascade J-T cryocooler. The cryocooler will be based on a high pressure ratio, oil-free, metal diaphragm compressor. This innovative compressor will be compact, inexpensive and extremely reliable. The compressor can either be used with single-stage mixed-gas or multi-stage cascade cycles. For a single-stage mixed gas cryocoo ...

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Two approaches are proposed to attack the problems of fixturing process. First, a novel hardware holding system, Dexterous Vise, is proposed. Functionally, a single Dexterous Vise is capable of revealing four faces of the clamped workpiece to the cutting tool without re-fixturing, which actually increases one degree of freedom to the machine tool. A pair of Dexterous Vises, the "Dual-Vise", ena ...