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CRYOGENIC HELIUM REFRIGERATORS AND LIQUIFIERS CONVENTIONALLYEMPLOY OIL LUBRICATED POSITIVE DISPLACEMENT COMPRESSORS AT THE WARM END AND FREQUENTLY USE PISTON TYPE EXPANSION ENGINES AT THE COLD END. THESE SYSTEMS REQUIRE EXTENSIVE AND VIGILANT MAINTENANCE TO CONTROL CONTAMINATION FROM LUBRICATING OIL AND ITS VOLATILE COMPONENTS MIGRATING TO THE COLD END. HENCE THE NEED FOR LOW MAINTENANCE COMPRESSO ...

THIS PROJECT WILL ANALYZE AND PREPARE THE CONCEPTUAL DESIGN FOR A DIGITAL FEEDWATER CONTROL SYSTEM FOR A COMMERCIAL LIGHT WATER REACTOR POWERPLANT. THE CONTROL SYSTEM WILL FEATURE SENSOR VALIDATION AND REPLACEMENT OF FAILED SENSORS WITH SYNTHETIC VARIABLES. AN ADVANCED TECHNIQUE BASED ON PATTERN-RECOGNITION ALGORITHMS ALREADY PROVEN IN SURVEILLANCE APPLICATIONS WILL BE USED TO VALIDATE SENSOR INPU ...

ACTIVE COOLING IS ESSENTIAL FOR FUSION REACTOR COMPONENTS EXPOSED TO HIGH HEAT FLUX LEVELS OVER LONG PULSE DURATIONS. EXISTING WATER COOLING CONCEPTS FACE A POTENTIAL PROBLEM WITH TRITIUM PERMEATION. HELIUM GAS COOLING CONCEPTS NOW BEING CONSIDERED SUFFER FROM LOW HEAT TRANSFER COEFFICIENTS AND HIGH PRESSURE DROP AND PUMPING POWER. THESE EXISTING TECHNIQUES, THOUGH ACCEPTABLE FOR PRESENT FUSION DE ...

A MICROWAVE AMPLIFIER IS PLANNED THAT SHOULD BE CAPABLE OF PEAK POWER OF UP TO SEVERAL HUNDRED MEGAWATTS AT HIGH EFFICIENCY AS WELL AS CONTINUOUS POWER AT LOWER LEVELS. THECONCEPT IS BASED ON TRANSVERSE MICROWAVE MODULATION OF A HIGH VOLTAGE ELECTRON BEAM COMBINED WITH A BENDING MAGNET TO PRODUCE AXIAL BUNCHING IN AN OUTPUT CAVITY. THE MECHANISM AVOIDS THE DIFFICULTY OF LONGITUDINAL BUNCHING AT RE ...

IN MOST CRYOGENIC SYSTEMS, THE PIPING JOINTS IN COLD REGIONSOF THE SYSTEM ARE MADE BY WELDING OR SOLDERING. THIS IS ESSENTIAL BECAUSE EXISTING DESIGNS OF CRYOGENIC PIPE SEALS CANNOT BE RELIED ON NOT TO LEAK. ANY SUCH LEAKS INTO THE COLD BOX REDUCE THE EFFECTIVENESS OF THE INSULATION, THEREBY REDUCING THE EFFICIENCY OF THE REFRIGERATOR. WELDEDJOINTS MAKE REPLACEMENT OF COMPONENTS DIFFICULT AND HAVE ...

The primary goal of this proposed work is to develop a long wavelength infrared (LWIR) colloidal quantum dot (CQD)-based focal plane array (FPA) and show its feasibility when used in a camera system and a hyperspectral imaging system. Phase I results cumulated in the first-ever synthesis of photoresponsive LWIR CQDs and CQD-based photodetectors at the single device level operating at room temperat ...

Chemical, biological, or toxin attacks in military and civilian settings are a serious and growing concern. Standard first aid for exposure to some chemical warfare agents and toxins includes the immediate administration of relevant antidotes using an autoinjector. When an attack occurs, pre-filled autoinjectors must be immediately available and thus highly portable, and they must be suitable fo ...

SEISMIC TESTS PROVIDE IMPORTANT DATA FOR IMPROVING THE SAFETY OF PIPING DESIGNS AND THE COST-EFFECTIVENESS OF DESIGN STANDARDS. UNFORTUNATELY, DISPLACEMENT MEASUREMENTS AT LOW FREQUENCIES FROM SUCH TESTS ARE GENERALLY UNAVAILABLE, EITHER BECAUSE DOUBLE INTEGRATION OF ACCELEROMETER SIGNALS CAUSES INACCURACIES OR BECAUSE LASER BASED EQUIPMENT IS TOO COSTLY TO ALLOW FOR SIMULTANEOUS MEASUREMENTS IN S ...

DEVICES EMPLOYING HIGH ENERGY GYRATING ELECTRON BEAMS FOR GENERATING HIGH POWER MICROWAVE RADIATION AT CENTIMETER AND MILLIMETER WAVELENGTHS ARE FINDING GREATER AND GREATER USE IN MAJOR DOE SPONSORED RESEARCH. OF SPECIAL INTEREST, FOR EXAMPLE, IS THE IDEA OF USING GYROKLYSTRONS OPERATING AT 10 HZ TO REPLACE THE 3 HZ KLYSTRONS AT THE STANFORD LINEAR ACCELERATOR. THE HIGHER FREQUENCY IS EXPECTED TO ...

THE POTENTIAL OF ULTRASONIC RANGING HAS BEEN RECOGNIZED BY MOST MOBILE ROBOTICS RESEARCHERS. VARIOUS NARROW BEAM SYSTEMS) WERE USED ON EARLY MOBILE ROBOT TEST BEDS. THE SHORTCOMINGS OF THESE SYSTEMS INCLUDE SLOW ACQUISITION SPEEDS, LOST SIGNALS FROM SPECULAR REFLECTIONS, AND INADEQUATE IMMUNITY FROM NOISE. THE FIRST COMMERCIALLY AVAILABLE BROAD BEAM ULTRASONIC SYSTEM FOR MOBILE ROBOTS WASRECENTLY ...