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1.
Andrei Shchegrov John Khaydarov Stepan Essaian Greg Nemet Suren Soghomonyan Hakob Danielyan Armen Poghosyan Gevorg Gabrielyan 《Journal of the Society for Information Display》2010,18(8):589-595
Abstract— A novel green laser source, based on a monolithic cavity microchip laser platform, has been developed. The laser is designed to be a part of a miniature and efficient RGB light source for microdisplay‐based mobile projector devices. The use of highly efficient, periodically poled MgO‐doped lithium niobate as the non‐linear frequency doubler allows for a significant increase in the overall efficiency of the green microchip laser. Specifically, a 50–150‐mW green output with a wall‐plug efficiency exceeding 10% in the temperature range of greater than 40°C has been demonstrated. A compact package for this laser source with a volume less than 0.33 cm3 is discussed and results of performance tests are presented. 相似文献
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Nare Alpheus Mautjana Donq Wen Looi John R. Eyler Anna Brajter-Toth 《Electrochimica acta》2009,55(1):52-58
A cone-shaped MS inlet and on-line electrochemistry (EC) were used to enhance the ionization efficiency in electrospray ionization mass spectrometry (ESI MS) of purine bases. A pathway of positive ion mode ESI may involve oxidation of purine bases, guanine, adenine, xanthine and hypoxanthine, by 1e−, 1H+ processes. The electrospray process generates dimers of purine bases that are detected in ESI MS as protonated ions, except for xanthine, for which a protonated radical dimer is detected. Thus electrochemical oxidation of purine bases during ESI may generate reactive radicals that can subsequently dimerize. Dimer formation is facilitated in ESI MS when the carrier solution pH is high. The positive ion mode ESI MS ionization is consistent with the reactivity of the bases toward oxidation. Furthermore, the formation of the protonated ions, and Na+ and K+ adducts of the bases, expected in positive ion ESI MS, are observed. In addition, unusual H-bonding of purine bases guanine and xanthine is confirmed by ESI MS. Application of low EC voltage to the on-line EC cell in EC/ESI MS improves the sensitivity and correlates with the decrease of the intensity of the dimers, possibly as a result of their further oxidation. 相似文献
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The catalytic partial oxidation of C2H6 over Pt and Rh coated monolithic supports (4.7 wt% M/α-Al2O3 45 PPI) was investigated with a capillary sampling technique for a range of C2H6/air ratios at constant inlet flow (~8 ms contact time), with and without H2 addition. Effluent data clearly indicate the differences in product distribution between catalysts and equilibrium. Rh effectively converts the reactant mixtures to syngas with ~80% selectivity, whereas Pt produces C2H4 with ~55% C-atom selectivity, while neither produces thermodynamically favored C. Spatially resolved measurements provide direct evidence of the multi-zone nature of the reactors. With Rh, complete conversion of O2 occurs to produce mostly CO, H2 and H2O within the first 3 mm of catalyst, followed by a reforming zone to produce additional syngas. Pt consumes O2 more slowly, which results in a steady increase in temperature along the reactor. Ethylene formation correlates to reactor temperatures >750 °C, regardless of C/O, in line with the onset of homogeneous reactions. Hydrogen addition tests (C2H6/O2/H2=2/1/2) clearly exhibit preferential oxidation of H2 with O2 over Pt, which shifts the maximum in temperature upstream while preserving a portion of the C2H6 for C2H4 production. H2 addition modifies the concentration and temperature profiles minimally on Rh. The main differences between catalysts are the high reforming and O2 consumption activity with Rh compared to Pt, which are likely responsible for differences in C2H4 yields. 相似文献
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A general characterization of chemisorption fibres with complexing properties is given. The specific features of the effect of the polymer matrix of fibre chemisorbents manufactured by hydrazidation of graft copolymers of cellulose (or polycaproamide) and polyacrylonitrile on the sorption properties, selectivity of sorption of metal ions, and stability of the properties in conditions simulating the conditions of use are examined. 相似文献
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