Award Data

With the advent of high-density low-power sub-20nm technology processes and circuits with tens-of-billions of transistors, radiation-induced single-event effects present a new set of design challenges for terrestrial applications. Developing reliable single-event effect resilient microelectronics in these modern technology nodes is a resource and time-intensive endeavor that further requires valid ...

AN ANALYTIC MODEL IS DEVELOPED FOR COMPUTING THE BLOWOFF IMPULSE DISTRIBUTION ON SMALL BODIES. CORRELATIONS ARE MADE BETWEEN MODEL PREDICTIONS AND UGT DATA. THE MODEL IS SIMILAR IN PHYSICAL BASIS, SPEED, AND SIMPLICITY TO THE BBAY FORMULATION FOR ONE-DIMENSIONAL BLOWOFF IMPULSE. AN GT AND UGT EXPERIMENT TECHNIQUE IS DEVELOPED SPECIFICALLY TO SUBSTANTIATE THE TWO-DIMENSIONAL MODELS AND TO PROVIDE D ...

ENVIRONMENTAL DISTURBANCES PRODUCED BY HIGH-ALTITUDE NUCLEAR DETONATIONS ARE WIDESPREAD AND PERSISTENT. DATA FROM ATMOSPHERIC TESTS (LATE 50'S, EARLY 60'S) PLUS EXTENSIVE RESEARCH EFFORTS ARE THE BASIC FOR UNDERSTANDING THE NUCLEAR ENVIRONMENT AND RESULTANT SYSTEMS EFFECTS. HOWEVER, ALL NUCLEAR TESTS AND MOST SUBSEQUENT BASIC RESEARCH HAVE INVOLVED ONLY SINGLE EXPLOSIONS. BALLISTIC MISSILE DEFENSE ...

AS NUCLEAR PLANTS GROW OLDER, ENVIRONMENTAL CONDITIONS MAY AFFECT THE PERFORMANCE OF PLANT CONCRETE AND STEEL STRUCTURES. WE PROPOSE TO DEVELOP A STRATEGY WHICH CAN BE APPLIED TO CONCRETE STRUCTURES. IT WILL BE DIRECTED TOWARDSTHE DEVELOPMENT OF METHODS TO ANALYZE AND UNDERSTAND AGING EFFECTS, INCLUDING THE COMBINED EFFECTS OF TIME, TEMPERATURE, RADIATION, HUMIDITY, STRESS, CHEMICAL ENVIRONMENT AN ...

AT PRESENT, COMPUTERS ARE AVAILABLE WITH ENORMOUS QUANTITIES OF CORE STORAGE AND EXTREMELY FAST COMPUTATIONAL CAPABILITIES AS COMPARED WITH COMPUTERS JUST A FEW YEARS OLD. IN THE NEXT YEAR OR TWO, EVEN MORE DRAMATIC INCREASES IN MEMORY AND COMPUTATIONAL SPEED WILL BECOME AVAILABLE. OF IMPORTANCE TO DNA/RAAE IS THE FACT THAT THESE NEW COMPUTERS WILL ALLOW THE CALCULATION OF HIGH ALTITUDE NUCLEAR WE ...

THE OBJECTIVE OF THE PROPOSED RESEARCH IS TO BUILD A USER-FRIENDLY, PERSONAL COMPUTER BASED WORKSTATION FOR PERFORMING TRAC-BWR ANALYSIS. THE SOFTWARE WILL ALLOW A USER TO READ-IN DATA FROM EXISTING TRAC-BWR INPUT DECKS (ASCII), DRAW NODALIZATION DIAGRAM, MODIFY INPUT, AUTOMATICALLY RENODALIZE THE VESSEL, CHAN AND PIPE COMPONENTS, GENERATE INPUT DECK, SUBMIT JOB, BRING BACK PLOTDATA, DISPLAY RESUL ...

THE PROBLEM OF GAS DYNAMIC FLOW PROPERTY MEASUREMENT IN PARTICLE LADEN FLOWS IS ADDRESSED VIA AN ADVANCED NUMERICAL MODEL SIMULATION STUDY OF PRESSURE GAUGE RESPONSE. THE APPROACH UTILIZES A HIGH-ORDER ACCURATE NUMERICAL SOLUTION TECHNIQUE FOR TURBULENT TWO-PHASE FLOWS. GAUGES OF EXISTING DESIGN SUCH AS THE GREG/SNOB GAUGES WILL BE ANALYZED OVER A RANGE OF CLEAN AND DUSTY AIRBLAST FLOW ENVIRONMENT ...

In this project, we propose to identify and examine solution growth approaches for engineering perovskite single crystal for gamma spectrometry in a hand-held sensor format. We will demonstrate that the solution growth approach is able to produce perovskite single crystal in sufficient volume and quality to yield a detector crystal whose utilization presents no inherent environmental, health, or s ...

STRIATIONS WITHIN NUCLEAR PLUMES CAN BE EXPECTED TO HAVE VERY NEGATIVEEFFECTS UPON COMMUNICATIONS, BECAUSE OF THEIR ENORMOUS SIZE, PERSISTENCE, AND RELATIVELY HIGH DENSITY. WE PROPOSE THE DEVELOPMENT OF A THREE-DIMENSIONAL NUMERICAL SIMULATION CODE TO STUDY THE EFFECTS OF FINITE PARALLEL RESISTIVITY, ELECTROMAGNETIC FIELDS, ION-NEUTRAL COLLISIONS, ION INERTIA, AND ION VISCOSITY UPON THE EVOLUTION ...

SDI SYSTEMS DESIGN AND OPERATIONS CAN BENEFIT FROM A BETTER UNDERSTANDING OF THE NUCLEAR PHENOMENOLOGY AT BURST ALTITUDES AROUND 1500 KM. SALVAGE FUZING OF INTERCEPTED WARHEADS COULD PRODUCE NUCLEAR EXPLOSIONS AT THESE ALTITUDES. KNOWLEDGE OF THE RESULTING NUCLEAR ENVIRONMENT CAN BE USED TO IMPROVE SDI SYSTEMS PERFORMANCE. FOR BURST ALTITUDES AROUND 1500 KM, EXPANDING DEBRIS IS EXPECTED TO SLOW PR ...