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To increase the performance of solar cells, solar spectrum splitting technique has been considered and studied. It was found from the simulation that the total efficiency of nearly 25% can be obtained at the splitting wavelength of 600 nm for thin-film type solar cell using a-Si and CIGS as the top and bottom cells, respectively. The experiment has been carried out to verify the simulation results...
We report the minority carrier effective lifetime τeff of crystalline silicon substrate via microwave absorption caused by free carriers induced by multiple wavelength light illumination at 635 and 980 nm. τeff was low of about 2.5×10−6 s in the case of 635 nm light illumination for n-type 520 μm thick bare silicon substrate, while it was high ranged from 8.2 × 10−6 to 1.8 × 10−5 s in the case of...
A new electrostatic focusing field emitter for FEA - HARP (field emitter array - high-gain avalanche rushing amorphous photoconductor) image sensor was designed. Simulation results showed that the new emitter can improve the emission current and suppress the electrons bombarding the insulator, a problem that degrades the reliability of the FEA.
flat image sensor consisting of a Spindt-type field emitter array (FEA) and a high-gain avalanche rushing amorphous photoconductor (HARP) target has been studied with the aim of developing ultrahigh-sensitivity compact television cameras . This image sensor is called an FEA-HARP sensor. The output signal current of the FEA-HARP sensor is obtained by reading out holes that have accumulated on the HARP...
Room temperature continuous-wave operation at 540 nm was demonstrated with a BeZnCdSe quantum-well laser-diode. Threshold current density of the narrow stripe, 800 µm cavity laser was as low as ∼1.7 kA/cm2
Imperfect practical conditions limit communication speed of quantum cryptography. Here we implement differential phase shift quantum key distribution with up-conversion assisted hybrid photon detector to achieve 1.3 M bits/s secure key rate over a 10-km fiber.
Image segmentation is an essential topic in a document processing system, and also is an important initial task for higher level image processing such as recognition or object tracking since recent years. In this paper we propose a method for segmentation and extraction of the regions of mathematical formulae and graphics in an academic paper. First, an academic paper image is transformed into a binary...
A 0.3 W operation for a single emitter broad area red laser at 45degC was achieved, for the first time, and a highly reliable 25 emitter array operation of 6.6 W at 25degC. The laser array is composed of 25 broad stripe lasers with a stripe pitch of 400 mum. The operation current, operation voltage, slope efficiency, emission wavelength and the energy conversion efficiency of the laser diode were...
Summary form only given. Visible broad-area laser diodes (BA-LDs) are of high interest due to their newly-emerging display application, because of their high chromatic purity and high brightness. Sony developed a 2005-inch laser display system which was exhibited at the EXPO 2005 Aichi Japan for six months. For this application, near-field pattern (NFP) is one of the most important characteristics...
Ca3Co4O9 ceramic powders were synthesized by the polymerized complex (PC) method and consolidated by the hydrothermal hot-pressing (HHP) technique. The observation by the scanning electron microscope indicated that the powders by the PC process showed fine and flaky grains. The density of the sintered body increased with an increase of the operating temperature, pressure and time during the HHP process...
In this paper we propose a method for correcting character recognition errors at the higher level recognition step in an understanding system for mathematical formulae. The system consists of two-level recognition steps: the low level recognition including character recognition, and the higher level recognition including layout recognition. We use the layout information recognized in the latter step...
Background: We tested the feasibility of hyperthermia combined with concurrent radiotherapy (thermoradiotherapy) for pain relief and local control of non-small cell lung cancer (NSCLC) invading to the chest wall. Methods: Thirteen patients with advanced NSCLC (eight stage IIIB and five stage IV) and severe pain caused by chest wall invasion of tumor were treated with thermoradiotherapy. During the...
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