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THE TRAVEL TIMES OF COHERENT EVENTS IN SEISMIC SURVEYS OF THE CRUST PRINCIPALLY GIVE INFORMATION ABOUT THE LOW SPATIALFREQUENCY VELOCITY FIELD; DETAILS OF THE SEISMIC SIGNATURES OF BACKSCATTERED EVENTS PRINCIPALLY GIVE INFORMATION ABOUT THE HIGH SPATIAL FREQUENCY OF THE VELOCITY AND DENSITY FIELDS (WHICH CAN BE REPRESENTED BY PSEUDO WELL LOGS). TRAVEL TIME INVERSION IS BEGINNING TO FIND PRACTICAL ...

THIS STUDY WILL IDENTIFY SEMICONDUCTOR PHOTOANODES AND PHOTOCATHODES THAT OPTIMIZE PHOTO-ELECTROLYSIS OF LIQUID H2S. THE QUANTUM (PHOTOVOLTAIC) EFFICIENCY OF N- AND P-TYPE ELECTRODES WILL BE MEASURED IN A HIGH PRESSURE PHOTOELECTROCHEMICAL CELL. THE GOAL WILL BE TO INCREASE THE YIELD OF HYDROGEN AND SULFUR OVER THAT RECENTLY OBTAINED IN WORK USING P-SI AND N-CDS. PHASE I WILL BE DIRECTED AT IDENTI ...

THE POTENTIAL OF ULTRASONIC RANGING HAS BEEN RECOGNIZED BY MOST MOBILE ROBOTICS RESEARCHERS. VARIOUS NARROW BEAM SYSTEMS) WERE USED ON EARLY MOBILE ROBOT TEST BEDS. THE SHORTCOMINGS OF THESE SYSTEMS INCLUDE SLOW ACQUISITION SPEEDS, LOST SIGNALS FROM SPECULAR REFLECTIONS, AND INADEQUATE IMMUNITY FROM NOISE. THE FIRST COMMERCIALLY AVAILABLE BROAD BEAM ULTRASONIC SYSTEM FOR MOBILE ROBOTS WASRECENTLY ...

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DIRECTIONAL AND EXTENDED-REACH DRILLING IN GAS FIELDS IS OFTEN EMPLOYED FOR MORE EFFECTIVE GAS DRAINAGE OR, IN CASES WHERE IT IS NECESSARY TO CROSS THE NATURAL FRACTURE NETWORK,TO MAXIMIZE GAS RECOVERY. AS THE DRILLING DIRECTION APPROACHES THE HORIZONTAL, THE RATE OF PENETRATION DIMINISHES AND THE HORIZONTAL REACH DECREASES, SINCE IT BECOMES DIFFICULT TO APPLY SIGNIFICANT WEIGHT ON THE BIT. A SYST ...

A MICROWAVE AMPLIFIER IS PLANNED THAT SHOULD BE CAPABLE OF PEAK POWER OF UP TO SEVERAL HUNDRED MEGAWATTS AT HIGH EFFICIENCY AS WELL AS CONTINUOUS POWER AT LOWER LEVELS. THECONCEPT IS BASED ON TRANSVERSE MICROWAVE MODULATION OF A HIGH VOLTAGE ELECTRON BEAM COMBINED WITH A BENDING MAGNET TO PRODUCE AXIAL BUNCHING IN AN OUTPUT CAVITY. THE MECHANISM AVOIDS THE DIFFICULTY OF LONGITUDINAL BUNCHING AT RE ...

THIS STUDY INVOLVES DESIGN OF A HIGH CURRENT, HEAVY ION, RECIRCULATING, INDUCTION LINEAR ACCELERATOR FOR INERTIAL FUSION. DOE RESEARCH PROGRAMS IN INERTIAL FUSION HAVE SHOWNTHAT THE HEAVY ION DRIVER METHOD IS A PROMISING ONE IN TERMSOF ION DEPOSITION, PELLET PHYSICS, ION BEAM TRANSPORT, AND OTHER MAJOR CHARACTERISTICS. HOWEVER, TO DATE SYSTEM DESIGNS HAVE BEEN LIMITED TO LINEAR ACCELERATORS BASED ...

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NATURAL MICROBIAL LEACHING OF TOXIC HEAVY METALS FROM URANIUM AND OTHER MINE TAILINGS IS A PROCESS THAT IS DIFFICULT TO CONTROL WITHOUT GREAT EXPENSE. THE REMOVAL OF LEACHED CATIONIC HEAVY METALS FROM WATERS ORIGINATING AT THESE MINE TAILINGS COULD HELP PREVENT THE CONTAMINATION OF GROUNDWATER, LAKES, AND STREAMS BY THESE TOXIC ELEMENTS. THESE METALS ALL BIND COVALENTLY TO THE RECENTLY DISCOVERED, ...

SEVERAL STATES ARE CURRENTLY SEEKING MUCH-NEEDED NEW LOW-LEVEL RADIOACTIVE DISPOSAL SITES IN ACCORDANCE WITH THE LOW-LEVEL RADIOACTIVE WASTE POLICY ACT OF 1980. ANY NEW COMMERCIALREQUIREMENT THAT A SITE BE CAPABLE OF BEING MODELED AND THATITS PERFORMANCE BE ASSURED FOR 500 YEARS. FOR MOST SITES, THE HYDROGEOLOGICAL AND RADIONUCLIDE TRANSPORT CHARACTERIS- TICS OF THE UNSATURATED ZONE ARE MAJOR FACT ...