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We propose to demonstrate the feasibility of fabricating a phototransistor using the A1xGa1-xN material system. The proposed phototransitor is based on a GaN-A1xGa1-xN heterojunction which exhibits a 2-D electron gas conduction when a bias is applied on the source-drain terminals. The device is maintained in a nominally OFF state by applying a reverse bias voltage on the gate terminal. With optica ...

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The developement of four different doping sources for use within an MBE system is proposed. Two high purity, high uniformity sources for use with Carbon, and two such sources will be developed for use with Tellurium. The purity of the species produced by each cell will be studied with a Residual Gas Analyzer. Recommendations concerning the use of these cells in a solid source MBE system will be su ...

A PHASE I FEASIBILITY STUDY IS PROPOSED FOR THE DEVELOPMENT OF A 2400 DEGREE KELVIN GAS SAMPLE CELL WHICH IS CAPABLE OF SIMULATING THE COMBU STION PRODUCTS OF HYDROGEN-AIR SCRAMJET PROPULSION SYSTEM AT PRESURES FROM 0.5 TO 2.0 ATMOSPHERES, FLOWS FROM 0 TO 1.0 STANDARD LITERS PERMI NUTE, AND A CELL COMPOSITION OF AIR WITH 20 PERCENT WATER VAPOR BY WEI GHT. ADDRESSED WITHIN THE PROPOSAL IS THE PRIMA ...

High temperature storage heaters are needed to provide clean, hot air for aerodynamic and propulsion testing of hypersonic vehicles. Vitiation heaters do not properly simulate the vehicle flight conditions, thus limiting the ability to develop tomorrow's aircraft in a timely manner. Yttria-zirconia storage heater development work was sponsored by the Air Force in the 1960's, but did not produce an ...

The development of a low-cost reliable and long-life novel, electrochemical sensor with multigas sensing capability that can detect 10 ppb of toxic gases and vapors with a response time of 30 seconds is proposed. During phase I, we will develop an electrochemical amperometric sensor cell with a three electrode configuration using nonaqueous aprotic electrolyte solution. This nonaqueous electrolyte ...

There exist many waste sites where the detailed characterization of the contamination needs to be performed to determine whether or not active remediation is necessary. These tests should be performed in situ since many of the contaminants are volatile. In addition, some of the sites are contaminated with radioactive waste, making in-site detection of contaminants difficult because the detectors b ...

IN THE LONGER TERM, THE RESULTS OF THIS RESEARCH COULD LEAD TO IMPROVE D METHODS AND EQUIPMENT FOR SAMPLING, CONCENTRATING AND ANALYZING TRACES OF HAZARDOUS CHEMICALS IN GROUNDWATER. SPECIFIC OBJECTIVES: 1) PREPARE HOLLOW FIBER MEMBRANES BY SURFACE MODIFICATION. 2) ASSEMBLE MEMBRANE MODULES. 3) TEST MODULES FOR PERMEABILITY TO SELECTED PESTICIDES IN WATER SOLUTION. 4) SELECT APPROPRIATE SOLVENTS F ...

BY UTILIZMG MAGNETORESISTIVE RANDOM ACCESS MEMORY (MRAM) IN COMBINATION WITH SENSOR TECHNOLOGIES, NVE WILL DESIGN A COMPLETE DATA GATHERING AND STORAGE SYSTEM FOR AIRCRAFT TRANSPARENCY SYSTEMS WHICH WILL RECORD OPERATIONAL DATA DURING FLIGHT AS WELL AS DURING SHIPPING AND STORAGE. FABRICATION AND ASSEMBLY INFORMATION CAN EITHER BE ENTERED AFTER MANUFACTURING OPERATIONS ARE COMPLETE, OR DURING THE ...

TO BE SUCCESSFUL THE C31 COMMUNITY HAS A NEED FOR SECURE, EFFICIENT COMPUTER SYSTEMS THAT SUPPORT THEIR MISSION. AN IMPORTANT ELEMENT OF CURRENT SYSTEMS IS THE NERWORK GUARD. SEVERAL GUARDS CURRENTLY DEPLOYED ALLOW TRANSFERS OF INFORMATION FROM LOW SECURITY LEVELS TO HIGH SECURITY LEVELS, BUT NO GENERAL PURPOSE GUARDS ARE AVAILABLE THAT ALLOW TRANSFERS FROM HIGH TO LOW. SCTC PROPOSES TO DEVELOP A ...