Award Data

THE PREDICTION OF MESOSCALE DISPERSION, FOR EMERGENCY RESPONSE PURPOSES, IS CRITICALLY DEPENDENT UPON ACCURATELY FORECASTING THE 3-D WIND FIELD WITHIN THE DOMAIN OF INTEREST SEVERAL HOURS IN ADVANCE. CURRENTLY AVAILABLE EMERGENCY RESPONSE SYSTEMS, WHICH TYPICALLY USE SOME FORM OF GAUSSIAN DIFFUSION MODEL COMBINED WITH WIND FIELDS INTERPOLATED FROM SCATTERED SURFACE LAYER WIND MEASUREMENTS, ARE, UN ...

RECENT ADVANCES INDICATE THAT TIME DOMAIN CALCULATIONS BASED ON FINITE DIFFERENCE (FDTD) HAVE THE CAPABILITY TO ACCURATELY COMPUTE RCS FROM GEOMETRICALLY GENERAL VEHICLES COMPOSED OF NONHOMOGENOUS MATERIALS. THE FDTD METHOD INVOLVES DIVIDING THE VEHICLE INTO SMALL CELLS. THE MATERIAL IN EACH CELL MAY BE SPECIFIED INDEPENDENTLY, THUS ALLOWING THE GREAT FLEXIBILITY. AN INCIDENT PLANE WAVE IS SPECIFI ...

HYPERSONIC VEHICLE APPLICATIONS REQUIRE COOLING ON THE WING LEADING EDGES AND COWL LEADING EDGES. HEAT PIPES CAN COOL THESE SURFACES EITHER ACTIVELY OR PASSIVELY. COOLING THE LEADING EDGE ACTIVELY REQUIRES AN AUXILIARY HYDROGEN COOLED HEAT EXCHANGER COUPLED TO THE HEAT PIPE CONDENSER. THIS METHOD ADD WEIGHT AND COMPLEXITY TO THE DESIGN. PASSIVELY COOLING THE LEADING EDGE REQUIRES A MATERIAL WITH A ...

THE SODIUM-SULFUR BATTERY IS A CANDIDATE ENERGY STORAGE MECHANISM FOR SATELLITES. THERMAL MANAGEMENT OF THE BATTERY CELLS IS REQUIRED DURING CHARGING AND DISCHARGING. PROPER THERMAL MANAGEMENT WILL ISOTHERMALIZE THE BATTERY CELLS BY PROVIDING THERMAL INSULATION DURING RECHARGE OR SUNLIGHT OPERATION AND PROVIDING A MEANS TO RADIATE EXCESS HEAT GENERATED DURING DISCHARGE OR ECLIPSE OPERATION. VARIAB ...

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