Award Data

IN THE LAST TWO YEARS, THERE HAVE BEEN INCREASING CONCERNS ABOUT THE POTENTIALLY LARGE COOLING OF THE LAND SURFACE TEMPERATURE RESULTING FROM THE SOOT AND DUST INJECTED INTO THE ATMOSPHERE BY THE EXPLOSIONS AND SECONDARY FIRES FROM NUCLEAR EXCHANGES, THE SO-CALLED "NUCLEAR WINTER" SCENARIOS. HERE WE ARGUE THAT, IN ADDITION TO DUST AND SOOT, A LARGE NUMBER OF TRACE GASES (NO[X], H[2]0, HC, CH[4]) C ...

Until now gamma radiation detection has required large single crystals of sensitive materials that are difficult to produce consistently on an industrial scale. In collaboration with a research group at the University of Texas at Arlington, Agiltron proposes to develop a new class of nanocomposite scintillator materials. The radiation detection characteristics of the synthetic nanoparticles in the ...

High-resolution scintillation crystals and crystal arrays are important components of current and future handheld and arrayed detectors (used for DOD/DTRA applications), and scintillation spectrometers (routinely used in high energy physics research, medical imaging, diffraction, homeland security, nuclear waste clean-up, nuclear treaty verification and safeguards, and geological exploration). Un ...

THE PROPOSED FIBLOC SENSOR PROVIDES AN ECONOMIC MEANS TO PROTECT, LITERALLY, MILES OF A PREFERRED PERIMETER REGION AGAINST UNAUTHORIZED INTRUSIONS. THE OPTICAL FIBERS EMPLOYED INT HE FIBLOC SENSOR PROPAGATE CW OR PULSED INFRARED LIGHT SIGNALS WHOSE TRANSMISSION AND/OR REFLECTION SENSITIVITY IS AFFECTED BY MECHANICAL PRESSURE SUCH AS WOULD BE PRODUCED BY THE DISTENSION OF SURFACED MOUNTED FIBERS AL ...

A batteryless and wireless sensor for intrusion detection and assessment of threats which requires no battery, external power or wiring is proposed. These types of sensors derive energy from passing vehicles or persons, and indicate their presence, location, speed, etc., via a self-generated short-range radio signal. These sensors require no maintenance, and can be inconspicuously placed in window ...

COMPUTER MEMORY ARRAYS ARE EXTREMELY VULNERABLE TO ELECTROMAGNETIC DISTURBANCES RESULTING FROM ACCIDENTAL OR HOSTILE ACTIONS. HARDENING AGAINST SUCH EFFECTS CAN BE IMPARTED EITHER BY ADDING EXTERNAL PROTECTION TO EXISTING SYSTEMS OR BY INCORPORATING SURVIVABILITY IN NEW DESIGNS. INHERENT HARDNESS CAN BE IMPARTED TO RANDOM ACCESS MEMORY ARRAYS BY USING THIN FILM FERROELECTRIC MATERIALS AS MEMORY EL ...

THE GOAL OF THIS PHASE I EXPERIMENTAL EFFORT IS TO DEMONSTRATE THE FEASIBILITY OF USING AN OPTICAL GLASS AS A SENSING ELEMENT FOR VERY HIGH PRESSURE MEASUREMENTS. CURRENTLY, PIEZO-ELECTRIC GAUGES ARE TYPICALLY USED. AS THESE SENSORS ARE ELECTRICAL IN NATURE, THEY ARE ADVERSELY AFFECTED BY ELECTROMAGNETIC INTERFERENCE (EMI) WHICH IS CREATED IN A NUCLEAR EVENT. THE PROPOSED FIBER OPTIC SENSOR BASED ...

THE PHASE I EXPERIMENTAL EFFORT WILL DEMONSTRATE THE FEASIBILITY OF A FIELD WORTHY GROUND MOTION SENSOR TO REPLACE PIEZO-ELECTRIC ACCELEROMETERS FOR CONVENTIONAL EXPLOSIVES AND NUCLEAR TESTING. THE OUTPUT SIGNALS OF PIEZO-ELECTRIC ACCELEROMETERS MUST BE INTEGRATED TWICE TO DETERMINE GROUND MOTIONS. THIS PROCESS REDUCES SYSTEM ACCURACY AND MEASUREMENT BANDWIDTH. ADDITIONALLY, AS PIEZO-ELECTRIC SENS ...

CONVENTIONAL INSTRUMENTATION FOR AIRBLAST PRESSURE MEASUREMENTS IN CAVITY SHOTS IS LIMITED IN RISE TIME CAPABILITY. THIS RESULTS IN THE INSTRUMENTATION PROVIDING AN INCORRECT INDICATION OF PEAK PRESSURE, WHICH CREATES DISTORTION IN GENERATED HEIGHT-OF-BURST CURVES. THE DEVELOPMENT OF A FIBER OPTIC AIRBLAST PRESSURE SENSOR BASED ON THE PHOTOELASTIC EFFECT IS PROPOSED. THIS TECHNIQUE PROMISES TO PRO ...

SIMOX MATERIAL IS RAPIDLY BECOMING THE SOI MATERIAL OF CHOICE FOR MANY IC APPLICATIONS, INCLUDING RADIATION HARDENED. A CONSTANT THEME OF CONCERN THROUGHOUT THE DEVELOPMENT OF THIS TECHNOLOGY HAS BEEN THE METALLIC IMPURITY CONTENT IN THE MATERIAL. MAJOR EFFORTS HAVE ADDRESSED THE ELIMINATION OF THE METALLIC CONTAMINATION BY MODIFICATION OF THE IMPLANTATION EQUIPMENT USED TO FABRICATE SIMOX MATERIA ...