Graham M. Smith

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Modulation of millimeter and submillimeter-wave beams via an optically excited semiconductor substrate is a potentially powerful technique, but typically requires high optical illumination densities. Various methods are outlined that yield reduced illumination levels and enable optimization of the substrate. As an example device, the photo-injected Fresnel(More)
The study examined the accuracy of stone casts produced from impressions taken in stock polycarbonate trays, some of which had been strengthened with autopolymerizing polymethyl methacrylate resin and four designs of custom-made trays. Impressions of an acrylic master model of the mandibular arch on which two extracoronal crown preparations and one(More)
This study examined the accuracy of stone casts produced from impressions taken in stock polycarbonate trays, some of which had been strengthened with autopolymerizing polymethyl methacrylate resin. Three techniques were used to make the impression of an acrylic master model of the mandibular arch on which two extracoronal preparations for bridgework and(More)
The bipedal spin label Rx is more restricted in its conformation and dynamics than its monopodal counterpart R1. To systematically investigate the utility of the Rx label, we have attempted to comprehensively survey the attachment of Rx to protein secondary structures. We have examined the formation, structure and dynamics of the spin label in relation to(More)
Scalability of the photo-injected Fresnel zone plate technique for adaptive beam forming and non-mechanical steering to higher sub-mm wave frequencies is discussed. This method proves to be an attractive option for a range of applications, where at higher frequencies larger F/D ratios are shown to yield optimal performance, with marginal increases in(More)
The dodecametallic Cr(III) cluster [Cr(12)O(9)(OH)(3)(O(2)CCMe(3))(15)] has a ground spin state of S = 6 characterized by the spin Hamiltonian parameters g(ZZ)() = 1.965, g(XX)() = g(YY)() = 1.960, D(S=)()(6) = +0.088 cm(-)(1), and E(S=)()(6) = 0 (where D and E are the axial and rhombic zero-field splitting parameters, respectively) as determined by(More)
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