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Progress toward a prototype MEMS gas chromatograph (muGC) designed for analyzing complex mixtures of volatile organic compounds (VOC) in breath is described. This muGC, named SPIRON, integrates a multi-stage preconcentrator/injector, a dual-microcolumn separation module, and a chemiresistor array detector with commercial minivalves and a minipump. Here, we describe results showing thermal control...
Deposition of small amounts (about 1/2 of a monolayer) of Cr onto a clean Al{001} surface completely destroys the long-range order in the top 4 or 5 layers of the substrate, as shown by the absence of low-energy electron diffraction (LEED) spots. However, prolonged deposition of Cr produces films which are epitaxial and probably also pseudomorphic with the Al substrate as indicated by quantitative...
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