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REALIZATION OF THE PERFORMANCE ADVANTAGES OF SUPERCONDUCTING DEVICES IN HIGH FREQUENCY COMMUNICATIONS DEPENDS ON DEVELOPMENT OF A LOW TEMPERATURE DEPOSITION PROCESS WITH EXACTING CONTROL OF STOICHIOMETRY AND MORPHOLOGY. MOCVD CAN MEET THESE NEEDS COUPLED WITH EASE OFSCALE-UP. HOWEVER, RECENT WORK AT ADVANCED TECHNOLOGY MATERIALS, INC. SHOWS THAT YBACUO AND BISRCACUO FILMS GROWN BY MOCVD AT TEMPERA ...

PROJECT OBJECTIVES ARE ADVANCING THE FABRICATION AND DESIGN TECHNOLOGY OF IR DETECTORS FROM BULK HGCDTE TO THE EMERGING TECHNOLOGY OF THIN FILMS; MAKING PROGRESS TOWARD FILMS ON SILICON WAFERS; AND IMPLEMENTING THE TECHNIQUE OF PULSED LASER DEPOSITION (PLD) FOR THE FABRICATION OF THESE HETEROEPITAXIAL-COMPOUND, SEMICONDUCTOR IR DETECTORS. PRESENT METHODS OF MATERIAL GROWTH, FROM BULK PROCESSES TO ...

COMPUTATIONAL, RATHER THAN EXPERIMENTAL, METHODS ARE PROPOSED TO DEVELOP, DESIGN, AND TEST THE NOISE SUPPRESSORS THAT WILL BE NEEDED TO QUIET THE JET TURBULENCE NOISE PRODUCED BY THE HIGH SPEED CIVIL TRANSPORT AND OTHER SUPERSONIC VEHICLES. THE VIABILITY OF THIS APPROACH IS DUE TO RECENT ADVANCES IN TURBULENCE THEORY AND NUMERICAL METHODS THAT COMBINE RENORMALIZATION GROUP METHODS AND SPECTRAL ELE ...

A PROTOTYPE DIGITAL, VIDEO-INTERACTIVE-BASED, INTELLIGENT, COMPUTER-ASSISTED TRAINING SYSTEM (DVI-ICAT) OR MISSION PLANNING SYSTEM WILL BE DEVELOPED. THE SYSTEM WILL SERVE BOTH AS A LAUNCHING POINT FOR FURTHER PHASE II WORK ON THE SYSTEM AND FOR DEMONSTRATING TO NASA/JSC THE CAPABILITIES AND POTENTIAL APPLICATIONS OF DVI TO TRAINING AND MISSION PLANNING. THIS SYSTEM WILL USE DVI TECHNOLOGY TO PRES ...

THE DESIGN, OPTIMIZATION, SIMULATION, AND TESTING OF LIQUID-FUEL ROCKET ENGINES INVOLVES A WIDE VARIETY OF GEOMETRICALLY COMPLEX, UNSTEADY, TURBULENT, MULTIDIMENSIONALREACTIVE FLOW PROBLEMS. IN A HIGH REYNOLDS NUMBER FLOW, THE DETAILS OF THE (THIN) FLAME FRONTS CANNOT BE RESOLVED, EVEN ON THE MOST SOPHISTICATED SUPERCOMPUTER. THIS PROBLEM WILL BE SOLVED USING LARGE-EDDY SIMULATIONS (LES), IN WHICH ...

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THIS PROJECT IS CONCERNED WITH THE DEVELOPMENT OF A COMPUTATIONAL TOOL THAT COMBINES SOLUTION-ADAPTIVE TECHNIQUES WITH AN OVERSET GRID TECHNIQUE TO SOLVE UNSTEADY AERODYNAMIC PROBLEMS IN SUCH AREAS AS POWERED LIFT, HELICOPTER-WAKE RESOLUTION, AND HIGH-ALPHA, ENHANCED MANEUVERABILITY AIRCRAFT. BOTH TECHNIQUES HAVE BEEN USED TO ATTEMPT TO SIMPLIFY THE TASK OF GENERATING EFFICIENT MESHES FOR COMPUTAT ...

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THE IMPORTANCE OF REDUCING THE NOISE EMITTED BY HELICOPTER ROTORS HAS BEEN WIDELY RECOGNIZED FOR MANY YEARS. PREVIOUS WORK BY CONTINUUM DYNAMICS IN THE ANALYSIS OF ROTOR AEROACOUSTICS LED TO THE DEVELOPMENT OF AN EFFICIENT AND ACCURATE LAGRANGIAN SIMULATION OF THE UNSTEADY VORTICITY FIELD IN THE VICINITY OF HELICOPTER MAIN ROTOR THAT COULD SERVE AS THE FOUNDATION FOR A GENERAL ANALYSIS OF THE NOIS ...

MEASURING THE EFFECTS OF IONIZING RADIATION ON CELLS OF THE IMMUNE SYSTEM AND DEVISING METHODS TO PROTECT HUMANS AGAINST RADIATION DAMAGE ARE ESSENTIAL TO LONG-DURATION SPACE TRAVEL. THE OVERALL OBJECTIVE OF THIS PROJECT IS TO DEVELOP FLOW CYTOMETRIC METHODS FOR MONITORING RADIATION DAMAGE TO LYMPHOCYTES, AND TO ASSESS CHEMICAL AGENTS FOR THEIR ABILITY TO SERVE AS RADIOPROTECTORS. THE RESPONSE OF ...