Award Data

CURRENT SYNCHROTRON-BASED MEDICAL IMAGING FACILITIES EMPLOY NARROW (.05 - 1%) BANDWIDTH MONOCHROMATORS TO PRODUCE MONOCHROMATIC SOURCES OF HARD X-RAYS FOR DUAL-ENERGY DIGITALSUBTRACTION ANGIOGRAPHY. WE HAVE BEEN ABLE TO DEMONSTRATE THAT THE BANDWIDTH CAN BE INCREASED TO 5 TO 10% PROVIDED THAT THE TWO QUASIMONOCHROMATIC SOURCES ARE LOCATED AN APPROPRIATE DISTANCE IN ENERGY FROM THE IODINE K-EDGE. M ...

MICROSTRUCTURE CONTROL IN ADVANCED CERAMICS AND COMPOSITES WOULD BE ENHANCED BY THE AVAILABILITY OF HIGH PURITY, SUBMICRON POWDERS OF CONTROLLED PARTICLE SIZE AND SURFACE CHEMISTRY. A VAPOR PHASE REACTION PROCESS IS PROPOSED FOR INVESTIGATION WHICH HAS POTENTIAL FOR ECONOMICALLY SYNTHESIZING SUBMICRON CERAMIC POWDERS. A STUDY WOULD BE CONDUCTED TO EVALUATE THE PARAMETERS CONTROLLING THE SYNTHESIS ...

FOR SURFACES AT HIGH TEMPERATURE, THE EMITTED SPECTRUM OF ELECTRO-MAGNETIC RADIATION IS THE MOST CONVENIENT PROBE OF TEMPERATURE, IF THE SPECTRAL EMITTANCE OF THE SAMPLE IS KNOWN. THIS PROPOSAL SUGGESTS THE APPLICATION OF A NOVEL, NON-INTRUSIVE SURFACE TEMPERATURE MEASUREMENT TECHNIQUE FOR THE IN-SITU DETERMINATION OF BOTH TEMPERATURE AND EMISSIVITY. THE TECHNIQUE EMPLOYS SMALL LOCAL MODULATION OF ...

COMPUTED TOMOGRAPHY (CT), A TECHNIQUE FOR RECONSTRUCTING THEINTERIOR OF AN OBJECT FROM MEASUREMENTS OF ITS LINE INTEGRALS (OR PROJECTIONS), IS INCREASINGLY BEING APPLIED INRESEARCH AND IN NON-DESTRUCTIVE EVALUATION OF INDUSTRIAL OBJECTS. TO HANDLE THE INCREASED SPATIAL RESOLUTION AND THROUGHPUT REQUIREMENTS OF THESE APPLICATIONS, CT SCANNERS MAY BE ABLE TO USE AREA DETECTORS INSTEAD OF THE SINGLE ...

OVER THE PAST FIFTEEN YEARS NUMEROUS IMPLANTABLE BIOSENSORS HAVE BEEN DEVELOPED, BUT THEIR COMMERCIAL VIABILITY IS LIMITED MOSTLY BECAUSE OF FAILURE DUE TO TISSUE OR BODY FLUID CORROSION OVER EXTENDED PERIODS. THE CHALLENGE REMAINS TO DEVELOP A COATING MATERIAL WHICH WILL ADHERE TO THE BIOSENSOR, NOT DEGRADE IN THE PRESENCE OF AN ELECTRIC FIELD, BE THIN ENOUGH TO ALLOW FOR USE WITH MICROELECTRONIC ...

THERE IS A NEED FOR IMPROVING THE FORECASTING OF LOCAL WEATHER ELEMENTS SUCH AS PRECIPITATION, SURFACE TEMPERATURE,ETC. CURRENT FORECASTS ARE MADE BY A STATISTICAL ADAPTATIONOF LARGE SCALE NUMERICAL FORECASTS. WE PROPOSE TO USE, INSTEAD, A MODEL THAT COMPUTES THE PHYSICAL PROCESSES THAT LOCALLY MODULATE THE LARGE SCALE METEOROLOGICAL FIELDS. THEPARAMETERS OF SUCH A MODEL NEED TO BE ADJUSTED TO THE ...

THE DISCOVERY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN RARE-EARTH COPPER OXIDE CERAMIC SYSTEM HAS LED TO CONSIDERABLE RESEARCH DIRECTED TOWARD THE DEVELOPMENT OF ELECTROMAGNETIC COMPONENTS AND DEVICES. HOWEVER, THE APPLICATION OF HIGH CRITICAL TEMPERATURE (TC) SUPERCONDUCTORS HAS BEEN LIMITED BECAUSE OF CRYSTAL ANISOTROPY OF THE RANDOMLY ORIENTED GRAINS IN POLYCRYSTALLINE MATERIALS, GRAIN BOUNDARY ...

RECENT ADVANCES IN AERODYNAMIC, STRUCTURAL, ELECTRONIC, AND PROPULSIVE TECHNOLOGIES MAKE POSSIBLE A NEW GENERATION OF LOW-COST UNMANNED AIRCRAFT FOR ATMOSPHERIC SCIENCE RESEARCH. THE FIRST SUCH PLATFORM, DESIGNATED PERSEUS, IS ALREADY UNDER DEVELOPMENT AS A JOINT EFFORT BETWEEN AURORA FLIGHT SCIENCES AND HARVARD UNIVERSITY. PERSEUS' LITHIUM BATTERY PROPULSION SYSTEM WILL ENABLE IT TO CARRY A 50 KG ...

A RESEARCH PROGRAM IS PROPOSED TO DETERMINE THE SCIENTIFIC FEASIBILITY OF A NEW TYPE OF BROAD AREA (>1000 CM(2)), HIGH ENERGY (>400 KEV) ELECTRON GUN CONCEPT. THIS PLASMA ELECTRON (PE) GUN USES A PLASMA, WHICH IS GENERATED AT LOW GAS PRESSURE USING A THIN-WIRE COLD-CATHODE DISCHARGE, AS THE DC SOURCE OF ELECTRONS. THE EXTRACTED ELECTRONS ARE FORMED IN BEAMLETS WHICH PASS THROUGH A THIN METAL FOIL ...

A RESEARCH PROGRAM IS PROPOSED TO DEVELOP A NEW AND INNOVATIVE TYPE OF BOREHOLE LOGGING TOOL FOR MEASURING THE BULK DENSITY OF GEOLOGICAL FORMATIONS. THIS TOOL USES ALINEAR INDUCTION ACCELERATOR (LIA) TO GENERATE AN INTENSE X-RAY BEAM WHICH IS SCATTERED FROM THE FORMATION. DETECTORS PLACED NEAR THE ACCELERATOR SENSE THE SCATTERED PHOTONS THEREBY PROVIDING A DIRECT MEASURE OF DENSITY. LIA-BASED SYS ...