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THE ATMOSPHERE CONTAINS MANY NATURALLY OCCURRING AND MANMADE FINE PARTICLES AND AEROSOLS. THESE PARTICLES AFFECTWEATHER, AIR QUALITY AND COMMUNICATIONS. KNOWLEDGE OF THEIRCONCENTRATION, COMPOSITION, DISTRIBUTION AND TRANSPORT IS IMPORTANT TO THE PREDICTION OF WEATHER, DETECTION AND CONTROL OF POLLUTION, HEALTH MONITORING OF VEGETATION AND ATMOSPHERIC CHEMISTRY. WHILE A METHODS PRESENTLY EXIST FOR ...

THE ABILITY TO OPTIMIZE THE DESIGN OF V/STOL AIRCRAFT AND TOPREDICT THEIR PERFORMANCE REQUIRES A GOOD UNDERSTANDING OF THE COMPLEX JET-INDUCED PHENOMENA ASSOCIATED WITH THESE AIRCRAFT. PRESENTLY, EXPERIMENTAL WORK IS THE MAIN AVENUE FOLLOWED TO GAIN AN UNDERSTANDING OF V/STOL FLOWS. NUMERICAL SIMULATION HAS MANY ADVANTAGES NOT SHARED BY EXPERIMENTAL TOOLS. IT THEREFORE CAN COMPLEMENT EXPERIMENTAL ...

THIS INVESTIGATION IS AIMED AT DEVELOPING AN ACTIVE FLOW CONTROL DEVICE TO GENERATE LARGE-SCALE, PERIODIC STRUCTURES IN A TURBULENT SHEAR FLOW. THE DEVICE WILL BE USED ON AIRBORNE LASER PLATFORMS TO REDUCE OR ELIMINATE OPTICAL DISTORTION OF THE LASER BEAM CAUSED BY THE TURBULENCE. CONTROLLED EXPERIMENTS WILL BE CONDUCTED IN AN 18-METER TOWING TANK TO INVESTIGATE THE FEASIBILITY OF GENERATING LARGE ...

HIGH-PRESSURE WATERJET IS ONE OF SEVERAL NEW METHODS FOR CUTTING MATERIALS DEVELOPED DURING THE LAST DECADE. CURRENTLY IT IS USED, AT STATIC WATER PRESSURE UP TO 60,000 PSI, TO CUT A WIDE VARIETY OF SOFT AND MEDIUM-HARD MATERIALS IN FACTORIES; IT HAS BEEN EVALUATED FOR GEOTECHNICAL APPLICATIONS WITH VERY LIMITED SUCCESS. THIS RESEARCH CONCERNS THE USE OF ABRASIVE-ENTRAINED WATERJET FOR CUTTING AND ...

IT IS PROPOSED TO SIMULATE ON THE COMPUTER, A SIX-PISTON, SELF-BALANCED STIRLING ENGINE. THE DOUBLE-ACTING PISTONS ARE CONNECTED IN TWO RINGS OF THREE IN THE SIEMENS ARRANGEMENT USED IN MAY KINEMATIC STIRLING ENGINES. THE PISTONS WILL BE SUPPORTED BY A LEAF SPRING AND A BELLOWS AND SEALED BY THE BELLOWS. IF EXECUTED PROPERLY, THIS WILL RESULT IN LONG LIFE WITH NO SEAL FRICTION. BY USING A RING OF ...

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AN INVESTIGATION IS PROPOSED HEREIN TO FORMALIZE, TEST AND EVALUATE NEW TECHNIQUES FOR IMPROVING THE TRANSIENT ACCURACYOF IMPLICIT FINITE-DIFFERENCE ALGORITHMS FOR THE TWO AND THREE-DIMENSIONAL COMPRESSIBLE NAVIER-STOKES EQUATIONS. THEPROPOSED INVESTIGATION IS MOTIVATED BY THE NEED FOR COMPUTATIONAL METHODS OF IMPROVED ACCURACY AND EFFICIENCY FOR APPLICATION TO TRANSIENT MULTIDIMENSIONAL FLOWS IN ...

PROPER DUCT DESIGN IS A FUNDAMENTAL ENGINEERING PROBLEM WHICH CAN HAVE A MAJOR IMPACT UPON COMPNENT EFFICIENCY. CURRENT AEROSPACE APPLICATIONS, WHICH PLACE A PREMIUM ON COMPACT DESIGN AND CLOSELY FIT COMPONENTS, OFTEN EXACERBATE THIS PROBLEM. EXAMPLES ARE DUCTS ASSOCIATED WITH INLETS ANDNOZZLES AS WELL AS TRANSITION DUCTS BETWEEN ENGINE COMPONENTS. AT PRESENT TECHNOLOGY IS AVAILABLE TO COMPUTE THE ...

A PROPOSAL IS PRESENTED HEREIN TO INITIATE A STUDY OF THE TRANSIENT BEHAVIOR OF A SILICON CHARGE COUPLED DEVICE (CCD) AND ITS RESPONSE TO INCIDENT RADIATION. THE MOTIVATION FOR THIS EFFORT IS BASED ON RECENT ANALYTICAL AND HARDWARE STUDIES WHICH HAVE IDENTIFIED THE POTENIALLY SIGNIFICANT BENEFITS I.E. REDUCED PSUEDONOISE (PN) CODE ACQUISITION TIME, THAT MAY BE ACHIEVED VIA THE APPLICATION OF CHARG ...

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