Award Data

The objective of this effort is to demonstrate a prototype model of a flight-critical system using AbTech's AIM network synthesis tool and NASA's CLIPS production rule system and to demonstrate the ability of an AIM generated polynomial network to reliably perform sensitivity analysis using variable components of this flight critical system. The resulting adaptive test generation, analysis, and co ...

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Future aeropropulsion systems require high temperature electronics and integrated sensors to meet desired performance levels. The wide bandgap of silicon carbide (SiC) makes it ideally suited for high temperature operation. To date, virtually all SiC-based devices have been fabricated using 6H-SiC. Device performance would significantly increase if 3C-SiC, the cubic form, were available. 3C-SiC ha ...

The inability to fabricate copper-based superconductors capable of transporting or circulating high current densities over large volumes has severely limited applications for wires and levitation. Difficulties in texturing these ceramic materials is due to the requirement for nearly perfect grain boundaries resulting from the small quasi particle coherence lengths. Control of the morphology and na ...

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The minimization of noise is of primary importance in optimizing system performance. Active noise cancellation is one of the most promising concepts for achieving noise reduction. This cancellation is generally obtained by means of some type of an adaptive filter. The key component of such a filter is the search algorithm (typically least meansquared) by means of which the filter adapts its coeffi ...

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The performance of pulse tube cryocoolers has developed rapidly since the introduction of the orifice by Mikullin in 1984. The proposed effort covers an additional innovation that has been shown to result in increased cryocooler performance. The replacement of the orifice by a room temperature piston allows the phase shifts and displacements to be completely controlled. This control results in cry ...

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The National Aeronautics and Space Administration (NASA) has identified the need for representation, indexing, storage, and retrieval of reusable software components. To address this need, American Research Corporation of Virginia proposes the development of an icon-based software component access system using a model based on the theory of partially ordered sets. Project objectives include develo ...