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The ability of thin films of polymer dispersed liquid crystals to operate as electro-optic devices for modulating infrared radiation between wavelengths of 1 and 5μm has been investigated. The complex optical properties of the polymer component of the films, and the real component of the refractive indices of the liquid crystals, have been determined using a combination of transmittance spectroscopy...
High-resolution endoluminal sonography (HRES) was used to image and measure esophageal varices in control subjects and patients with portal hypertension and compared with endoscopic findings. Nine control patients and 68 patients with known cirrhosis or noncirrhotic portal hypertension underwent videotaped HRES and videotaped esophagoscopy (EGD). Two blinded investigators reviewed the videotapes to...
Polymeric and low molecular mass azobenzenes, ferrocene derivatives and a diphthalocyanine have been deposited on silicon, principally using the Langmuir-Blodgett technique. Interference-enhanced reflectometry was used for gas sensing, with films selected to give low reflectance of green light in air. For a polysiloxane azobenzene material, reflectance changes were up to 75% on exposure to 100 ppm...
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