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COMMERCIAL AND GOVERNMENT SPACE TRANSPORTATION SYSTEMS DEPEND ON GROUND SUPPORT FOR NAVIGATION. THE GROUND SOLUTION CAN BE COSTLY AND MAY PROVIDE LESS ACCURACY THAN NEEDED. A GPS-BASED REAL-TIME AUTONOMOUS SPACECRAFT NAVIGATION SYSTEM IS PROPOSED. AN ALGORITHM WILL BE DEVELOPED WHICH COMBINES GPS-DERIVED POINT POSITION ESTIMATES WITH A PROPAGATED A PRIORI POSITION ESTIMATE. THE POINT POSITIONS ARE ...

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ARTIFICIAL INTELLIGENCE/EXPERT SYSTEM TECHNIQUES HAVE DEMONSTRATED THE ABILITY TO ADDRESS COMPLEX REASONING TASKS REQUIRED FOR PROCESS PLANNING. FEATURE-BASED DESIGN THEORY AND PRELIMINARY EFFORTS HAVE SHOWN THE POTENTIAL OF PROVIDING A FUNDAMENTAL MODEL FOR CAPTURE AND MANIPULATION OF DESIGN KNOWLEDGE. HOWEVER, THE TWO TECHNOLOGIES HAVE NOT BEEN SUFFICIENTLY INTEGRATED TO ALLOW DESIGN FEATURES TO ...

THE OBJECTIVE IS A COMPACT, RELIABLE AND INEXPENSIVE METHOD FOR SAMPLING LARGE VOLUMES OF AIR RAPIDLY TO DETERMINE THE CONCENTRATION OF AIRBORNE EXPLOSIVES. THE APPROACH INVOLVES THE USE OF A MULTIVORTEX PRECIPITATOR CAPABLE OF EFFICIENTLY REMOVING FINE PARTICULATES AND LARGE MOLERCULES FROM THE AIR AND COLLECTING THEM FOR CONVENIENT ANALYSIS. DURING PHASE I, A PROTOTYPE WILL BE TESTED FOR COLLECT ...

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THIS PROPOSAL OUTLINES A FIRST-PHASE PLAN FOR CONSTRUCTING AN ENVIRONMENT TO DESCRIBE, PROTOTYPE, AND MANAGE SOFTWARE DEVELOPMENT PROCESSES. KEY TOOLS OF THIS ENVIRONMENT INCLUDE SEMANTICALLY RICH GRAPHICAL EDITORS TO DESCRIBE PROCESSES AND AN INTERPRETER FOR PROCESS SIMULATION AND INTERACTIVE EVALUATION OF SCHEDULING AND RESOURCE ALLOCATION AGAINST THE MODEL. THE ENVIRONMENT WILL BE BUILT ON PROT ...

A NEED EXISTS TO MONITOR VIBRATION IN HIGHWAY BRIDGES. IT IS DESIRABLE TO MONITOR MANY POINTS ON THE BRIDGE. THE CURRENT PROBLEM IS THAT SENSORS MUST BE WIRED TO A CENTRAL LOCATION. WIRE IS DIFFICULT TO INSTALL AND TO MOVE. THE SOLUTION IS TO COLLECT SENSOR DATA BY RADIO. A SYSTEM EXISTS THAT ELIMINATES WIRE. IT GATHERS SENSOR DATA TO A CENTRAL LOCATION BY RADIO. THE SYSTEM'S UNIQUE FEATURE IS THA ...

THE GOAL OF AMERICAN INDUSTRY LOOKING TO THE FIERCE COMPETITION OF THE NEXT DECADE IS TO MANUFACTURE PRODUCTS (1) AT REDUCED COSTS, (2) WITH SHORTER LEAD TIMES, AND (3) AT A HIGHER QUALITY. COMPONENTS THAT WOULD ASSIST IN ACHIEVING THIS GOAL INCLUDE (1) AUTOMATED PROCESS PLANNING, (2) DESIGN RETRIEVAL, AND (3) PRODUCIBILITY/VALUE ANALYSIS. NEEDED TECHNOLOGICAL BREAKTHROUGHS FOR EFFECTIVE COMPUTER- ...

THE PRIMARY GOAL OF THIS PROJECT IS TO DEVELOP AND DEMONSTRATE A SIMULATION/FACTORY CONTROL CAPABILITY TO (1) SIMULATE PRODUCTS, PROCESSES, AND FACTORY CONFIGURATIONS AT MULTIPLE LEVELS OF ABSTRACTION, (2) PROVIDE FINE GRAINED ANALYSIS OF PRODUCT AND PROCESS DESIGNS, AND (3) PROVIDE A MODEL DRIVEN FACTORY CONTROL ARCHITECTURE SO THAT THE MODELS EXECUTED IN THE SIMULATION STUDIES CAN BE DIRECTLY US ...

FUEL CELLS OPERATING IN AQUEOUS ELETROLYTES (BELOW 200¿C, DEPENDING ON THE CHOSEN ELECTROLYTE TECHNOLOGY) NORMALLY OPERATE ON HYDROGEN FUEL AND OXYGEN (OR AIR) AS THE OXIDANT. HIGH-PERFORMANCE FUEL CELL ELECTRODES REQUIRE HIGH CATALYST SURFACE AREAS, GOOD ELECTRONIC CONDUCTIVITIES AND BROAD REACTION ZONES, DEFINED BY THE CONTACT AREA BETWEEN THE CATALYST, THE GAS PHASE REACTANT AND THE ELECTROLYT ...