Award Data

A pulsed neutron generator is proposed for the detection of special nuclear material. A recently developed microwave-excited plasma neutron generator will be pulsed to produce the activating neutrons whose pulse lengths vary from 100 microseconds to 2 ms with a fall time of less than 1 microseconds. We demonstrated that we can increase the peak yield as a function of either RF or microwave power, ...

THIS PROJECT WILL DEFINE A COMPUTER SIMULATION CAPABILITY THAT CAN SYNTHESIZE CLOUD CLUTTER AND SEA RADIANCE SCENES MEASURED BY SHIPBORNE IRST SENSORS. THE CAPABILITY WILL BE AN EXPANSION OF ARI'S EXISTING AERIE (AERODYNE INFRARED EARTH) IR BACKGROUND RADIANCE SIMULATION CODE, DEVELOPED TO SYNTHESIZE INFRARED SCENE RADIANCES MEASURED BY IMAGING SENSORS. DETAILS OF THE PHYSICAL PROPERTIES OF THE CL ...

MEASUREMENT OF WIND AND TURBULENCE BY REMOTE SENSING TO A HEIGHT OF AT LEAST ONE KILOMETER ABOVE GROUND LEVEL HAS BECOME WELL ESTABLISHED. SUCH SYSTEMS ARE KNOWN AS DOPPLER ACOUSTIC SOUNDING SYSTEMS (DASS) OR SOUND DETECTION AND RANGING (SODAR). THESE SYSTEMS UTILIZE SOUND AT RELATIVELY LOW FREQUENCIES - 1200 TO 2000 HZ. RECENT EXPERIMENTAL WORK HAS SHOWN THAT THE "MINI-SODAR" HAS GREAT POTENTIAL ...

DISPERSING SONAR BUOYS OVER A TWO-DIMENSIONAL OCEAN AREA WOULD BE FACILITATED IF SOME OF THE BUOYS WOULD GLIDE PERPENDICULAR TO THE FLIGHT PATH OF THE DISPENSING AIRPLANE. TO DEVELOP THE TECHNOLOGY FOR THIS LATERAL FLIGHT, A PROGRAM IS PROPOSED WHICH, AFTER OUR INTER-ACTIONS WITH THE SPONSOR ON PATTERN SHAPE AND ACCURACY REQUIREMENTS, 1) EXPLORES VARIOUS CONFIGURATION CHANGES WHICH WOULD PROVIDE A ...

The use and applications of radiological sources, for power, medical, and defense applications, continuously increases with time. Illicit nuclear materials represent a threat for the safety of the American citizens and the detection and interdiction of a nuclear weapon is a national problem that has not been yet solved. This represents an enormous challenge to current detection methods and monitor ...

THE PHASE I RESEARCH PROPOSED HEREIN ADDRESSES THE NEED TO DETERMINE THE OPTIMUM PLACEMENT OF MILD DETONATION CORD ON AIRCRAFT CANOPIES TO ENSURE THAT DURING EJECTION THE CANOPIES WILL DISINTEGRATE INTO PIECES THAT DO NOT INFLICT INJURY ON THE ESCAPING PILOT. THE PROPOSED APPROACH UTILIZES FINITE ELEMENT METHODOLOGY IN COMBINATION WITH RECENTLY DEVELOPED TWO-DIMENSIONAL CRACK-TIP ELEMENTS OF SUPER ...

THE ACTIVE SONARS TYPICALLY USED ON SUBMARINES OPERATE AT FREQUENCIES HIGH ENOUGH TO BE DIFFICULT IF NOT PRESENTLY IMPOSSIBLE TO MODEL ACCURATELY WITH FINITE ELEMENT ANALYSIS. LIKEWISE BEAM AND CYLINDER MODELS PROVIDE INADEQUATE REPRESENTATIONS OF THE HIGH FREQUENCY BEHAVIOR OF PLATE AND FRAME VIBRATIONS. THE APPLICATION OF THE AARC STATISTICAL ENERGY ANALYSIS PROGRAM WHICH INCLUDES BENDING, LONGI ...

THE OBJECTIVE OF THE PROPOSED RESEARCH IS TO LIMIT VOLTAGE DELAY, ANODE CORROSION DURING INTERMITTENT USAGE AND TO INCREASE THE CURRENT CAPABILITY AND CAPACITY OF LI/SOCL(2) CELLS THROUGH THE USE OF NEW ELECTROLYTE SALTS. THE PRINCIPLES USED WILL BE THOSE WHICH HAVE SUCCEEDED IN THE PAST, NAMELY, BY LIMITING THE CONCENTRATION OF THE ELECTROLYTE SALT AND BY USING THE LITHIUM SALTS OF LARGE ANIONS W ...

THE INTENT OF THE PRESENT PROPOSAL IS TO DEMONSTRATE THAT HIGH OPTICAL QUALITY BATIO3 SINGLE CRYSTALS CAN BE SECURED BY ADAPTING THE HEAT EXCHANGER METHOD (HEM[TM]) OF CRYSTAL GROWTH TO HIGH TEMPERATURE SOLUTION GROWTH. THE PHASE I CRYSTALLIZATIONS WILL BE CONDUCTED FROM A BARIUM BORATE SOLUTION (BAB2O4). BARIUM TITANATE IS KNOWN TO CRYSTALLIZE FROM THIS SOLUTION. THE MINIMUM TEMPERATURE AVAILABLE ...

ON THE BASIS OF PERFORMANCE, SAPPHIRE IS ONE OF THE BEST MATERIALS FOR MISSILE DOME APPLICATIONS. HOWEVER, BOULE UTILIZATION AND HIGH FABRICATION COSTS MAKE IT AN EXPENSIVE CHOICE, AND, THEREFORE, NO U.S. MISSILE PRODUCTION PROGRAMS ARE USING SAPPHIRE DOMES. IT IS DESIRABLE TO GROW NEAR NET-SHAPE SAPPHIRE DOMES FOR MISSILE APPLICATIONS. IT HAS BEEN DEMONSTRATED THAT WHEN MOLYBDENUM SHEETS ARE PLAC ...