John G. Hartley

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Combining vapour sensors into arrays is an accepted compromise to mitigate poor selectivity of conventional sensors. Here we show individual nanofabricated sensors that not only selectively detect separate vapours in pristine conditions but also quantify these vapours in mixtures, and when blended with a variable moisture background. Our sensor design is(More)
This paper examines the controversy over the relative energy efficiencies of R·l34a and R·l2, from a theoretical thermodynamic perspective. In this regard, we have used an in·house process flowsheeting program which allows us to simulate the complete thermodynamic cycle, and investigate the effects of superheat: and subcooling. Spedal attention is given to(More)
Spatial-phase-locked electron-beam lithography is a method of precisely locating pattern elements on a substrate by providing real-time feedback of the beam’s location by means of a fiducial grid located on the substrate surface. Previously, this technique has been demonstrated in Gaussian-beam systems, in one and two dimensions. In this paper we propose a(More)
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