Award Data

VISIBLE SEMICONDUCTOR DIODE LASERS ARE OF INTEREST FOR OPTICAL RECORDING APPLICATIONS FOR INCREASED DENSITIES AND FOR DIRECT READ AFTER WRITE APPLICATIONS. CURRENTLY AVAILABLE DEVICES BASED ON INGAP/INGAALP HETEROSTRUCTURES GROWN BY MOCVD OPERATE AT WAVELENGTHS OF 0.67 UM. DIFFICULTIES ARISE IN REDUCING THE OPERATING WAVELENGTH OF THESE STRUCTURES DUE TO THE NEED TO INCORPORATE AL INTO THE ACTIVE ...

THE PRIMARY OBJECTIVE OF THIS PROGRAM IS TO DEVELOP A PHASE-LOCKED LASER DIODE ARRAY THAT CAN DELIVER OUTPUT POWER GREATER THAN 200 MW. THE DIODE SHOULD HAVE LONG LIFE AND BE CAPABLE OF MODULATED BANDWIDTHS GREATER THAN 500 MHZ. THE OUTPUT BEAM SHOULD BE ABLE TO BE COLLIMATED TO WITHIN ONE MILLIRADIAN SO THAT IT IS SUITABLE FOR LONG DISTANCE SPACE COMMUNICATION. THE PHASE I EFFORT INVESTIGATES TWO ...

THIS PROJECT INVOLVES A NEW APPROACH FOR A LOW POWER FOURIER TRANSFORM PROCESSOR. AN ALGORITHM WHICH REQUIRES NO MULTIPLICATIONS IN THE FOURIER TRANSFORMATION HAS BEEN DEVELOPED. IT IS TO BE IMPLEMENTED AND TESTED IN THIS PROGRAM. THE ALGORITHM IS WELL SUITED FOR REAL-TIME SPECTRAL ANALYSIS AT FREQUENCIES OF INTEREST IN THE 0 TO 10 HZ RANGE REQUIRED FOR PROCESSING MAGNEMOMETER DATA. THE WORK ALSO ...

THIS IS PHASE I OF A PROGRAM TO DEVELOP AND EVALUATE NOVEL 4D COMPOSITES CONTAINING NON-ORTHOGONAL FIBER ORIENTATION. A 4D COMPOSITE WILL BE DESIGNED AND FABRICATED WITH IN-PLANE FIBER ANGLES OF 0 DEGREES/ 60 DEGREES PLUS A LOW CONCENTRATION OF THROUGH-THE-THICKNESS FIBERS. THIS CONSTRUCTION SHOULD YIELD A COMPOSITE WITH GOOD TENSILE, COMPRESSIVE AND SHEAR PROPERTIES IN THE PLANE OF THE PANEL COMB ...

THE OBJECTIVE OF THIS RESEARCH IS TO STUDY THE FEASIBILITY OF APPLYING ARTIFICIAL INTELLIGENCE TECHNOLOGY TO THE DERIVATION OF SPACECRAFT DATA SYSTEM REQUIREMENTS FROM USER SCENARIOS. DURING PHASE I THE RESEARCH WILL BE DIRECTED TOWARD THE DEVELOPMENT OF A FORMAL NOTATION FOR THE EXPRESSION OF SCENARIOS WHICH ALLOWS THE USER THE NECESSARY FLEXIBILITY IN DESCRIBING HIS USE OF THE SYSTEM. THIS NOTAT ...

THE DATA OBTAINED FROM MEASUREMENT OF RADON PROGENY AT REMOTE LOCATIONS AND VARYING ALTITUDES YIELDS VALUABLE INFORMATION ON GEOLOGIC PHENOMENA AND CONDITIONS, AND ON GLOBAL BIO-GEOCHEMICAL TRANSPORT MECHANISMS. THE SURFACE GENERATION OF RADON, AND ITS SHORT HALF-LIFE PERMITS EVALUATION OF AIR MASS MOVEMENT. THIS IS OF PARTICULAR VALUE IF MEASURED ON A NEAR REAL-TIME BASIS. A REAL TIME AIR SAMPLER ...

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WE PROPOSE TO DEVELOP A BROADLY TUNABLE NARROWBAND FREQUENCY STABILIZED PULSED ALEXANDRITE LIDAR TRANSMITTER SUITABLE FOR AIRBORNE AND SPACEBORNE MISSIONS. THIS LASER TRANSMITTER WILL PROVIDE NEAR TRANSFORM LIMITED OUTPUT PULSES ACROSS THE 760 TO 770 NM SPECTRAL REGION. OUR APPROACH WILL BE BASED ON A NUMBER OF NEW TECHNOLOGICAL DEVELOPMENTS THAT PROMISE DRAMATIC IMPROVEMENT IN LASER PULSE ENERGY, ...

THE ACCURATE PREDICTION OF THE PERFORMANCE OF A HELICOPTER ROTOR IN HOVER IS CRITICAL TO THE SUCCESS OF THE DESIGN. A NOVEL APPROACH TO THE SOLUTION OF THE HELICOPTER FREE WAKE HOVER PROBLEM IS ADDRESSED BY FINDING THE SELF-PRESERVING WAKE SHAPE WHICH IS STEADY IN BLADE-FIXED COORDINATES. THE SOLUTION CAN BE USED TO PREDICT THE AVERAGE PERFORMANCE OF ROTOR IN HOVER. THE SOLUTION OBTAINED BY AN INF ...

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