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AN INNOVATIVE APPROACH TO DEVELOPING A RETURN FLUX EXPERIMENT OF VEHICLE EMITTED GASES, VIA COLLISIONS WITH THEAMBIENT ATMOSPHERE, IS PRESENTED. THE SENSORS AND SOURCES REQUIREMENTS ARE DEVELOPED IN CONJUNCTION WITH NECESSARY MODELING PARAMETERS ASSESSMENT. THE EXPERIMENT PACKAGE IS DESIGNED FOR DEPLOYMENT IN THE SHUTTLE PAYLOAD BAY. THE SENSORS TO BE EVALUATED INCLUDE A PRESSURE GAUGE WITH DIRECT ...

EXISTING CONTAMINATION ASSESSMENT MODELS FOR SPACECRAFT UTILIZE A SINGLE COLLISION SCATTERING MODEL TO PREDICT FLUXES OF CONTAMINANTS ON SURFACES AND CONTRIBUTIONS TO OPTICAL LINES-OF-SIGHT. THEY ALSO DO NOT INCLUDE THE RAM PRESSURE BUILDUP OF AMBIENT GASES NEAR SPACECRAFT SURFACES. AN INNOVATIVE APPROACH IS PRESENTED THAT UPDATES THE GAS DYNAMICS MODELING OF CONTAMINANTS AND AMBIENT ATMOSPHERE IN ...

DIRECT COMPUTATION OF TURBULENCE NOISE IS A LOGICAL APPLICATION FOR ADVANCED COMPUTATIONAL FLUID DYNAMICS, CFD, PROGRAMS RUN ON SUPERCOMPUTERS. THIS WOULD ELIMINATE THE HIGHLY EMPIRICAL ASPECTS OF PRESENT NOISE PREDICTION TECHNIQUES AND ENABLE STUDY OF ADVANCED HYPERSONIC PROPULSION SYSTEMS. HOWEVER, MANY OF THE SAME PERSISTENT PROBLEMS OF IMPLEMENTATION THAT EXIST IN AEROACOUSTIC THEORY AND MEASU ...

THE DIGITAL ACTIVE MATERIALS-PROCESSING PLATFORM EFFORT BE- ING PROPOSED HERE SEEKS TO DEVELOP AN ACTIVELY STABILIZD PLATFORM UPON WHICH MICRO-G MATERIALS PROCESSING EXPERIMENTSCAN BE PERFORMED IN SPACE. WITH THE SUC- CESSFUL COMPLETION OF THE TWO-STEP PHASE I WORKPLAN APPLIED TECHNOLOGY ASSOCIATES (ATA) HAS CLEARLY AND SUCCINTLY DEFINED THE PROBLEM OF PLATFORM ISOLATION IN SPACE AND HAS COMPLETEL ...

THE ROTORCRAFT COMMUNITY HAS A CONTINUING NEED FOR IMPROVED DESIGN TECHNIQUES FOR HOVER AND AXIAL FLIGHT. SUCH TECHNIQUES CAN BE EMPLOYED TO BEST ADVANTAGE IF THEY ARE COUPLED WITH NUMERICAL OPTIMIZATION METHODS. THIS COUPLING WOULD MINIMIZE TRIAL AND ERROR COMPUTATIONS WHEN SEARCHING FOR CONFIGURATIONS TO MEET PARTICULAR DESIGN SPECIFICATIONS. A NEW, HIGHLY ADVANCED HOVER PERFORMANCE ANALYSIS REC ...

WE PROPOSE TO OPTIMIZE EPITAXIAL LAYERS OF IN.53GA.47AS ALLOYS WHICH DETECT LIGHT IN THE 1.0-1.7 MICRON SPECTRAL REGION. THE GOAL OF THE PROGRAM IS TO BRING THE YIELD OF INGAAS PHOTODIODES TO SUCH A LEVEL THAT PRODUCTION OF MULTI-ELEMENT (>50) LINEAR ARRAYS WITH 10% UNIFORMITY BECOMEPRACTICAL WITHIN THE PHASE I EFFORT. WE PLAN TO GROW DETECTOR STRUCTURES IN OUR HYDRIDE VAPOR PHASE EPITAXIAL (VPE) ...

FLIGHT SIMULATION IS A PRIMARY AND CRITICAL FORM OF TRAINING. HOWEVER, CURRENT SIMULATORS HAVE NOT YET BEEN INTEGRATED WITH COMPUTER-BASED TRAINING (CBT) TECHNOLOGY. THIS MEANS THAT AUTHORING TOOLS AND OTHER TYPICAL CBT CAPABILITIES SUCH AS PERFORMANCE MONITORING, GIVING ADVISE TO STUDENTS AND ANSWERING QUESTIONS, AND RECORD KEEPING FUNCTIONS ARE NOT AVAILABLE FOR TRAINING WITH SIMULATORS. WE BELI ...

A HERMETICALLY SEALED, ALUMINUM-ELECTROLYTIC CAPACITOR WILL BE DEVELOPED AS A REPLACEMENT FOR TANTALUM CAPACITORS IN SPACE POWER SYSTEMS. THIS WILL SIGNIFICANTLY REDUCE POWER SUPPLY VOLUME AND WEIGHT. THESE CAPACITORS WILL OPERATE FROM -55 DEGREES CENTIGRADE TO 105 DEGREES CENTIGRADE, HAVE AN ESTIMATED 20-YEAR LIFE, AND HAVE A HIGH CV PRODUCT: FOR EXAMPLE, 1000MUF250 WV. THE AVAILABILITY OF A FAMI ...

COMPUTATIONAL FLUID DYNAMICS (CFD) TOOLS HAVE NOW DEVELOPED TO THE POINT WHERE THEY CAN BE RELIABLY USED FOR THE DESIGN,EVALUATION, AND ANALYSIS OF SUCH HIGH-PERFORMANCE GAS TURBINES AS THOSE USED IN MODERN AERONAUTICAL PROPULSION SYSTEMS. FOR THESE APPLICATIONS, IT IS NECESSARY TO USE A THREE-DIMENSIONAL VISCOUS CFD CODE THAT COMBINES EFFICIENCY,ACCURACY, AND USER-FRIENDLINESS. FOR AXIAL TURBOMAC ...

BONE WEAKENING IS A CONCERN FOR ASTRONAUTS, WHO NOW EXERCISEIN FLIGHT TO PREVENT LOSS OF BONE IN THE LEGS AND FRACTURE ON LANDING. USING INNOVATIVE METHODOLOGY, THIS PROJECT WILL DESIGN AN INSTRUMENT THAT PROVIDES DIRECT, NON-INVASIVE, ACCURATE, AND REPRODUCIBLE MEASUREMENTS OF BONE STIFFNESS, A COMPONENT OF BONE STRENGTH. THE LONG BONES OF THE LOWER EXTREMITIES OF HUMANS AND LARGER SPECIES OF ANI ...