Optical properties of In2O3-coated cover glass for solar collectors

Visible and infrared optical properties of tin-doped In2O3 films were examined with regard to their electrical properties so as to be able to meet the requirements made on a solar collector operated at 100 °C. Reflectances and transmittances were calculated on the basis of the Drude theory as functions of the density and mobility of carrier and the film thickness. Α good agreement between measured and theoretical reflectances indicates that this theory can describe the optical properties of the films. The calculations predicted a carrier density of about 3 · 10^20/cm^3 for the cut-off wavelength at 2 μm, the most effective minimum thickness of 400 nm, and the highest possible carrier mobility of e.g. 40 cm^2/(V s) to raise the selectivity for solar energy. Selective transparent films could be prepared by controlling the mobility and density of carrier with the introduction of about 1 wt% SnO2 or with annealing the films with 5 wt% SnO2 in air at 400 °C. From these results, it is concluded that the evaluation of the optical selectivity of In2O3 films can be achieved by determining their electrical properties

破裂巨大腎動脈瘤の1例

64歳女, 下腹部不快, 失神発作にて発症したエコー, CTにて腎動脈瘤の破裂を強く疑い, 血管造影にて確診した。この際コイルによる塞栓を試みたが不能で, 腎摘出を行い救命しえたWe report a case of rupture of giant renal artery aneurysm (10 cm diameter) with lower abdominal discomfort and a syncopal attack. The patient was successfully treated by nephrectomy. Rupture of a giant renal artery aneurysm is lethal in most cases and prompt diagnosis is indispensable. As preoperative diagnosis, ultrasonography was useful as it showed the blood flow in the renal artery aneurysm in real-time. CT scan was also useful in determining accurately the size of the aneurysm and extension of hematoma in its surroundings