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Proposed is a new concept for high effectiveness regenerative heat exchangers which are critically needed to develop efficient cryocoolers for operation at temperatures of 10K and below. Development of light weight, power efficient, long life cryocoolers capable of providing refrigeration at and below 10K has become a critically-pacing technology for spaceborne instrumentation. The best current 10 ...

A new method is proposed for the development of stable, high speed electro-optic polymers for optical waveguide devices such as switches and couplers. Thin polymer films will be produced by a new process that we refer to as flash evaporation. The process is based on negative electron beam photoresist technology, capable of easily processing thin-film and waveguide structures on various substrates, ...

Research and Development is proposed of a novel form of compact freon-free refrigeration system. The proposed unit operates on the Stirling cycle using air as the working fluid. The refrigeratro has an innovative arrangement of four double-acting pistons which will permit a compact, rugged system of high thermodynamic efficiency fabricated from commonly available materials. Another innovative feat ...

SILICON NITRIDE IS AN ADVANCED CERAMIC MATERIAL WITH EXCEPTIONAL PROPERTIES. HOWEVER, A SEVERE PROPERTY LIMITATION IS OBSERVED IN THE LOW FRACTURE TOUGHNESS OF SI(3)N(4). THE POTENTIAL FOR UTILIZATION OF SI(3)N(4) CERAMICS IN MANY APPLICATIONS WOULD BE SIGNIFICANTLY IMPROVED IF ITS FRACTURE TOUGHNESS COULD BE INCREASED WITHOUT SACRIFICING HIGH TEMPERATURE STRENGTH. IT IS PROPOSED THAT THE ABOVE CA ...

M-Dot, Inc. ("M-DOT") proposes to design, fabricate and test a thrust reverser system for low cost expendable turbojet engines. The system will be designed for application on the Sunstrand TJ-90 engine and will be configured for application on a bifurcated exhaust duct. The system will consist of the following: 1. Custom fabricated bifurcated exhaust duct for the TJ-90 engine. 2. Two pivoting vect ...

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The development effort will be divided into two major tasks: develop and evaluate candidate protection concepts, and investigate and evaluate armor materials to be used in the concepts. There are unique ballistic protection concepts and armor materials which we will evaluate. We intend to consider, as a minimum, flexible and rigid armoring concepts. The flexible concepts are based on Simula's pate ...

THIS DOCUMENT DESCRIBES A PROPOSAL BY M-DOT INC. TO DESIGN, FABRICATE AND TEST A 110 LB. THRUST PULSEJET ENGINE TO BE USED AS A RESEARCH TOOL TO EVALUATE THE FOLLOWING CONCEPTS: 1. MICROPROCESSOR CONTROLLED ELECTRIC FUEL INJECTION. 2. HIGH DURABILITY VALVED AND VALVELESS INLET DESIGNS. 3. OXYGENATED FUEL BLENDS FOR INCREASED THRUST. THE PHASE I PROGRAM WOULD ACCOMPLISH THE FOLLOWING TASKS: 1. DESI ...

AstroPower is developing a two-junction monolithic tandem solar cell composed of (AlxGa1-x)0.51In.49P lattice matched to GaAs for use as the top cell in a three-junction, two-terminal tandem stack. This tunable bandgap material system is capable of current matching, at 2.03eV, in a two-junction monolithic tandem solar cell two terminal design of (AlxGa1-x)0.51In0.49P/GaAs yielding a best case pred ...