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THE OBJECTIVE OF THIS PROJECT IS TO EVALUATE THE FEASIBILITY OF GROWTH OR FUSION OF OPTOELECTRONIC DEVICES DIRECTLY ONTO THE OPTICAL FIBER. THIS APPROACH WILL HAVE SIGNIFICANT IMPLICATION AND BENEFITS ON FUTURE FIBER OPTIC COMMUNICATIONS. TO ACHIEVE THE OBJECTIVE, A COMPLETE LITERATURE SEARCH RELATED TO THE TOPIC WILL BE COMPILED. A THEORETICAL ANALYSIS ON ALL POSSIBLE DESIGNS WILL BE INVESTIGATED ...

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THIS PROPOSAL COVERS THE DEVELOPMENT OF A CRYOCOOLER WITH A REFRIGERATION CAPACITY OF 0.75 WATT AT 20 KELVIN. THE CRYOGENIC UNIT WILL HAVE A VOLUME OF LESS THAN 16 CM3, AND CAN PROVIDE COOLING FOR 5 MINUTES AFTER A COOLDOWN PERIOD OF LESS THAN 20 SECONDS. THE CRYOCOOLER USES A NEW FABRICATION TECHNIQUE THAT LEADS TO A HIGH RELATIVE EFFICIENCY WITH A MINIMUM VOLUME.

A CRYOCOOLER CAPABLE OF OPERATING UNDER EXTREMELY HIGH ACCELERATION LEVELS IS PROPOSED. THE CRYOCOOLER USES THE LINDE-HAMPSON CYCLE, AND CAN REACH APPROXIMATELY 80 KELVIN. MULTI-STAGE UNITS, TO REACH LOWER TEMPERATURES, ARE ALSO POSSIBLE.

THIS PROPOSAL COVERS THE DEVELOPMENT OF A 0.25 WATT, 80 K MECHANICAL CRYOCOOLER FOR USE IN SENSOR COOLING IN SPACE. THE CRYOCOOLER WILL USE THE MIKULIN PULSE TUBE CYCLE THAT HAS NO MOVING PARTS IN THE COLD SECTION OF THE CRYOCOOLER. THE ELIMINATION OF COLD MOVING PARTS REMOVES THE MAIN SOURCES OF FAILURE AND OF VIBRATION IN THE CRYOCOOLER. LIFETIMES OF OVER FIVE YEARS SHOULD BE POSSIBLE WITH THIS ...

THE DEVELOPMENT OF A LIQUID HELIUM TEMPERATURE CRYOCOOLER ISPLANNED. A REGENERATIVE CRYOCOOLER WILL PROVIDE A 20 K TEMPERATURE SINK OF A JOULE-THOMSON (J-T) STAGE USING HELIUM. AN INNOVATIVE DESIGN FOR THE J-T STAGE HEAT EXCHANGERS WILL ALLOW THE USE OF SIMPLE, HERMETIC COMPRESSORS, WHICH WILL MAKE A PORTABLE, LONG LIFETIME UNIT POSSIBLE. THE STUDY WILL FOCUS ON SYSTEMS HAVING A COOLING POWER OF L ...

CIVILIAN AND MILITARY SPACECRAFT SYSTEMS, COMMUNICATIONS, DETECTION, TRACKING AND SURVEILLANCE ACTIVITES CAN BE ENDANGERED OR DEGRADED BY SOLAR ACTIVITY. THE SUN INDUCES THESE DISTURBANCES THROUGH MAGNETIC FIELD DISTURBANCES, ELECTROMAGNETIC AND CHARGED PARTICLE IRRADIATION OF THE EARTH'S UPPER ATMOSPHERES. ONE METHOD OF CIRCUMVENTING SERIOUS CONSEQUENCES OF THIS ACTIVITY IS THROUGH SPACE BASEDMON ...

A NEW CONTROL TECHNOLOGY IS AVAILABLE WHICH CAN BE USED TO DESIGN AN ADAPTIVE, REAL-TIME COMPENSATOR TO COUNTER THE EFFECTS OF RADOME BORESIGHT ERRORS IN RF HOMING MISSILES. THIS CONTROL THEORY MAKES USE OF THE FACT THAT RADOME ERRORS ARE NOT COMPLETELY RADOM, BUT MAY BE DESCRIBED BY THE WEIGHTED SUM OF A FINITE NUMBER OF FUNCTIONS WHOSE WEIGHTING COEFFICIENTS ARE ASSUMED PIECEWISE CONSTANT, BUT O ...

FUNDAMENTAL PHYSICS OF THE COMBUSTION PROCESSES IN LIQUID ROCKET ENGINES IS VERY COMPLEX. RECENT ADVANCES IN COMPUTATIONAL FLUID DYNAMICS (CFD) PROVIDE A BASIC MECHANISM FOR DETAILED ANALYSES. THE EXISTENCE OF CFD TECHNIQUES INCREASES THE NEED OF ADEQUATE MODELS FOR PHYSICAL PROCESSES, SUCH AS: ATOMIZATION AND SPRAY FORMATIONUNDER SUB AND SUPERCRITICAL CONDITIONS, DROPLET-DROPLET INTERACTION, TURB ...

COMPARED TO CONVENTIONAL TURBOJET/TURBOFAN ENGINES, THE SUPERSONIC COMBUSTION RAMJET (SCRAMJET) IS A MORE EFFICIENT PROPULSION SYSTEM AT HIGH FLIGHT MACH NUMBERS AND ALTITUDE. HOWEVER, THERE ARE INSUFFICIENT DATA TO ASSESS ENGINE CYCLE PAYOFFS. IT IS PROPOSED TO USE A VALIDATED COMPUTATIONAL FLUID DYNAMICS (CFD) CODE TO PRODUCE THE NEEDED DATA. IN PHASE I, AN EXISTING FAVRE-AVERAGED, COMPRESSIBLE, ...