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THE SEEMINGLY IMPOSSIBLE TASK OF PRODUCING ONE-HALF OF A MEGAWATT OF ACOUSTIC POWER UNDERWATER AT A FREQUENCY OF 5 HZ IS ADDRESSED. THE EXPLOITATION OF THE RECENT INTRODUCTION OF NEW RARE EARTH PERMANENT MAGNET MATERIALS, THE CONCEPT OF USING A FLEXURAL DISC RADIATOR, AND THE RECENT CULMINATION OF TWO YEARS OF ELECTRODYNAMIC TRANSDUCER DEVELOPMENT IS PROPOSED. THE USE OF MATHEMATICAL MODELING, EXP ...

MOVING-COIL TRANSDUCERS ARE USUALLY ASSOCIATED WITH LOW POWER, LOW EFFICIENCY, BROADBAND AND VERY LOW FREQUENCY APPLICATIONS. THE RECENT INTRODUCTION OF RARE EARTH PERMANENT MAGNETIC MATERIALS HAVING HIGH ENERGY DENSITIES AND THE RECENT DEVELOPMENT OF BETTER DESIGN TECHNIQUES SIGNIFICANTLY IMPROVE EFFICIENCY, POWER HANDLING ABILITY, AND HIGH FREQUENCY OPERATION. THE APPLICATION OF THESE IMPROVEMEN ...

AN/PSC-2 DIGITAL COMMUNICATION TERMINAL (DCT) REQUIRES A POWER CONVERTER THAT CONVERTS 115 VAC TO 8 VDC FOR ABOARD SHIP USAGE. THE HIGH TEMPERATURE AND HUMIDITY CONDITION ON THE SHIP, COMBINING WITH THE POSSIBLE SALTY ATMOSPHERE CAN GREATLY LOWER THE RELIABILITY OF ANY ELECTRONIC DEVICE BECAUSE OF THEIR CORROSIVE ACTION ON THEM. THE PROPOSED CONVERTER IS BELIEVED TO SURVIVE THE HARSH ATMOSPHERE CO ...

THE OBJECTIVE OF THE STUDY EFFORT IS TO PRODUCE COMPLETE SPECIFICATIONS, A DETAILED DESIGN, AND PERFORMANCE CALCULATIONS FOR A 'FREQUENCY-STEPPED' GROUND PENETRATING RADAR (GPR) SYSTEM. THE FREQUENCY STEPPED APPROACH WILL ALLOW IMPROVEMENTS OVER THE TYPICAL 'SHORT-PULSE' RADAR BY IMPROVING BANDWIDTH CONTROL, IMPEDANCE MISMATCH COMPENSATION, HIGHER OUTPUT POWER, AND COHERENT INTEGRATION AND IMAGE P ...

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"DARK FOCUS" IS DEFINED AS THE RESTING STATE OF VISUAL ACCOMMODATION YET TWO GENERAL MISCONCEPTIONS EXIST. FIRST, THAT THE RESTING POINT IS AT OPTICAL INFINITY, AND SECONDLY,THAT THE EYE ACCOMMODATES ACCURATELY. VISUAL PERFORMANCES REQUIRED IN SPACE ENTAIL CONTINUOUSLY CHANGING VIEWING DISTANCES AND TO ALLOW CREW MEMBERS TO PERFORM ROUTINELY ACCOMMODATION CHANGES NEED TO BE ASSESSED. WHEN A PERSON ...

HIGH TECHNOLOGY SENSORS IS PROPOSING TO DEVELOP A MINIATURE NDIR SENSOR FOR THE PURPOSE OF MEASURING RESPIRATORY FUNCTIONS OF A NAVAL AVIATOR. THE SENSOR WILL FIT IN A SMALL EXTENSION OF THE AVIATOR'S MASK AND WILL UTILIZE AN ALL SOLID STATE INFRARED SOURCE DEVELOPED BY HIGH TECHNOLOGY SENSORS. A BREADBOARD SENSOR WILL BE DESIGNED, FABRICATED AND TESTED AS PART OF THE PHASE I PROGRAM.

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