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NUCLEATION REMAINS AN OBSTABLE TO THE GROWTH OF SINGLE CRYSTAL FILMS OF DIAMOND ON NON-DIAMOND SUBSTRATES. TWO KEY FACTORS CONTROL THE NUCLEATION OF DIAMOND ON SI: THE FORMATION OF A SIC LAYER BETWEEN THE SI AND THE FILM, AND SPONTANEOUS NUCLEATION OF THE SIC ON THE CONTAMINATED SI SURFACE. IMPRECISE CONTROL OF THE NUCLEATED SIC LAYER HAS DEFEATED PREVIOUS ATTEMPTS AT HETEROEPITAXY OF DIAMOND ON S ...

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A SOLID STATE SWITCH FOR OPERATION AT CRYOGENIC TEMPERATURE IS BEING DEVELOPED THAT WILL PROVIDE MULTI-MEGAWATT POWER CONDITIONING IN THE RAPIDLY EXPANDING FIELD OF LOW TEMPERATURE ELECTRONICS. SINCE EXISTING CONTROLLED SWITCHES ARE NOT DIRECTLY SUITABLE FOR CRYOGENIC OPERATION, ONLY A FUNDAMENTAL APPROACH CAN DEVELOP STRUCTURES CAPABLE OF LOW LOSS AND RELIABLE OPERATION IN THE TEMPERATURE RANGE B ...

THE COOLING REQUIRED FOR THE PROPER OPERATION OF VARIOUS SENSORS AND INSTRUMENTS IS A KEY PROBLEM IN SPACE-BASED FACILITIES. A NOVEL CONCEPT HAS BEEN DEVELOPED AT LONE PEAK ENGINEERING BASED ON THE COMPRESSION OF A GAS TO HIGH PRESSURES USING A SOLID ELECTROLYTE COMPRESSOR. RAPID EXPANSION OF THE COMPRESSED GAS (JOULE-THOMSON EFFECT) CAN BE USED TO COOL SPACECRAFT INSTRUMENTS AND EQUIPMENT. SOME O ...

THE QUANTUM DOT SEMICONDUCTORS, THE SUBJECT OF THIS PROPOSAL, ARE A NEW CLASS OF NONLINEAR OPTICAL MATERIALS WHICH OFFER CONSIDERABLE PROMISE FOR THE FABRICATION OF NOVEL NONLINEAR OPTICAL COMPOSITES AND RESULTING DEVES. THE FILTER GLASSES (A SUBSET OF THIS CLASS OF MATERIALS) ARE NOW WELL KNOWN BUT THE PROSPECTS FOR MOLECULAR ENGINEERING TO MODIFY THE PARTICLES AND/OR THEIR SURFACES TO IMPROVE TH ...

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