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THERE IS CURRENTLY GREAT DEMAND FOR A MATERIAL WITH SUPERIOR MECHANICAL PROPERTIES THAT CAN BE MAINTAINED TO HIGH TEMPERATURES. SILICON NITRIDE HAS BEEN IDENTIFIED AS ONE OF THE MOST PROMISING CERAMICS TO MEET THESE MATERIAL REQUIREMENTS. TO DATE, RESEARCH ON SI3N4 CERAMICS HAS RESULTED IN SUPERIOR ROOM TEMPERATURE PROPERTIES BUT RETENTION OF THESE PROPERTIES TO HIGH TEMPERATURES HAS NOT BEEN AC ...

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THE HYDROXYL RADICAL (OH) PLAYS A KEY ROLE IN THE PHOTOCHEMISTRY OF BOTH THE TROPOSPHERE AND THE STRATOSPHERE. IT IS THE PRIMARY OXIDIZING AGENT RESPONSIBLE FOR THE REMOVAL OF MOST TRACE GASES INCLUDING CO AND CH4. SINCE THE OH RADICAL DETERMINES THE LIFETIMES AND, THUS, THE CONCENTRATIONS OF MANY CHEMICAL SPECIES, ACCURATE DETERMINATION OF OH CONCENTRATION IS PIVOTAL IN UNDERSTANDING ATMOSPHERI ...

THE RECENT AVAILABILITY OF THE CARBON ICOSOHEDRAL MOLECULES, THE FULLERENES, AND THE DISCOVERY OF SUPERCONDUCTIVITY IN ALKALI DOPED FULLERENE DERIVATIVES OPENS NEW AVENUES OF INVESTIGATION INTO SUPERCONDUCTING DEVICES. IN PARTICULAR, THE FULLERIDES ARE PREDICTED TO ACHIEVE HIGH PERFORMANCE AS SUPERCONDUCTING BOLOMETERS. MOST OF THE CURRENT SUPERCONDUCTING INFRARED SENSORS HAVE UTILIZED BOLOMETRI ...

THERE IS A GROWING MARKET IN THE POWDER METALLURGY INDUSTRY FOR INTERMETALLIC POWDER WITH FINE PARTICLE SIZE AND GOOD COMPOSITIONAL CONTROL. A PROCESS TERMED PLASMA INITIATED SELF PROPAGATING HIGH TEMPERATURE SYNTHESIS (PSHS) IS PRESENTLY BEING DEVELOPED TO MEET THE GROWING DEMAND FOR SUCH POWDERS. HOWEVER, FOR SUCH A PROCESS TO COMPETE AGAINST THE EXISTING POWDER MANUFACTURING TECHNIQUES WOULD ...

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THE PRIMARY OBJECTIVE OF THIS RESEARCH PROJECT IS TO DEVELOPNEW GAS SENSING TECHNOLOGY BASED ON THE KELVIN METHOD OF ELECTRONIC WORK FUNCTION MEASUREMENT. THE HIGH SENSITIVITY OF THIS TECHNIQUE TO ADSORBED GASES WILL BE AUGMENTED BY THEUSE OF A GOLD-FILM ACTIVE SURFACE AND ELEVATED TEMPERATURE OPERATION TO ESTABLISH SELECTIVITY AND EXTEND THE CONCENTRATION LIMITS OF OPERATION. THE PROPOSED RESEARC ...

MOST ELECTROPOLISHING TREATMENTS FOR STAINLESS STEELS EMPLOY MULTIPLE OPEN MILDLY ACIDIC VESSELS. CONCERNS REGARDING FUMES AND CARRYOVER OF MORE AGGRESSIVE ACIDS MAKE COMMERCIAL TREATMENT FOR TITANIUM UNAVAILABLE. AN AUTOMATED ENCLOSED SINGLE TANK ELECTROPOLISHING MACHINE PROVIDES AN ENVIRONMENTALLY FRIENDLY METHOD FOR TITANIUM. WORKPIECES ARE PLACED IN A DRY VACUUM-TIGHT CHAMBER AND NECESSARY ...

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A HIGH-SPEED FIELD EMISSION TRIODE DEVICE WHICH DOES NOT REQUIRE HIGH VACUUM FOR OPERATION IS DESCRIBED. THIS IS ENABLED BY COATING A MICRO-TIP CATHODE WITH RECENTLY INVENTED VERY LOW WORK FUNCTION DIAMOND THIN FILM, SUCH THAT THE ELECTRIC FIELD TO EXTRACT ELECTRONS FROM THE CATHODE IS LESS THAN 5 VOLTS PER MICROMETER. HENCE A VOLTAGE OF ONLY 5 VOLTS NEED BE APPLIED BETWEEN THE CATHODE AND THE G ...