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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 ...

Applied Physical Sciences Corp. (APS) proposes the Phase II development of an Acoustic Intensity Localization System (AILS). AILS utilizes a vector hydrophone to measure the latitude-longitude offset to an acoustic projector attached to surface buoy whose position is known via GPS. A major advantage of the AILS concept is that it can operate with extreme precision even at relatively low frequenc ...

A high-performance cooling system for gimbal-mounted infrared sensors is a critical need for future space-based target acquisition and tracking systems. A candidate approach uses a high performance cryocooler remotely located on the spacecraft platform combined with a high conductance, cryogenic heat transport system to exchange heat from the sensors to the cryocooler. The heat transport system ...

THE RESULTS OBTAINED TO DATE BY VARIOUS AUTHORS INDICATE CLEARLY THAT NUMERICAL SOLUTIONS ARE MORE ACCURATE AND RE QUIRE MUCH LESS COMPUTER TIME AND STORAGE WHEN THE GRID POINTS ARE PROPERLY LOCATED. THE DEVELOPMENT OF THE SOLU- TION OVER A REAL TIME PATH OR ITERATIVE PROCESS (FALSE TIME PATH) REQUIRES THE MESH NODES TO MOVE DYNAMICALLY IN THE PROPER POSITION AT EACH ITERATION OR INSTANCE OF TIME. ...

The objective of this program is to develop a wide field of view spectral imaging sensor to support theater surveillance and intelligence. The AHS operates in the Mid Wave Infrared (MWIR) band and provides day/night spectral target cueing, geolocation and identification of hot battlefield threats. Currently deployed EO sensors can measure broadband MWIR signals, but are incapable of providing adva ...

The detection of low velocity targets by a high PRF surveillance radar such as the E-3 AWASCS is exacerbated by the two different clutter return phenomena: the J-Hook return and the Horseshoe return. The J-Hook return is observed primarily when the antenna points downward. In these geometries the clutter screen below the antenna may not adequately suppress the elevation sidelobe return, which ...

This proposal addresses the need for a modern aircrew personnel lowering device (PLD) to help parachutists extricate themselves from trees. The existing PLD design is over three decades old and is large and cumbersome. A more compact and streamlined device is desired as a future replacement. Creare proposes to develop a new PLD that uses a small, high-strength cord, a friction device that opera ...

PHASE I WILL EVALUATE THE FEASIBILITY INCLUDING COST/BENEFITS OF RETRO-FITTING SHIPBOARD MAIN PROPULSION DIESEL ENGINES WITH ADVANCED TECHNOLOGY COMPONENTS TO INCREASE PERFORMANCE AND RELIABILITY, AND TO SAVE ON MAINTENANCE, REPAIRS, AND FUEL COST. THESE COMPONENTS WILL BE IN THE AREAS OF CURRENT ENGINEERING DEVELOPMENT BY SEAWORTHY AND ARE ADVANCED TURBOCHARGERS, CERAMIC COATING OFENGINE PARTS, A ...