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Melvin John F. Empizo,Kohei Yamanoi,Kazuhito Fukuda,Ren Arita,Yuki Minami,Toshihiko Shimizu,Nobuhiko Sarukura,Tsuguo Fukuda,Alexandra B. Santos-Putungan,Ray M. Vargas,Arnel A. Salvador,Roland V. Sarma 한양대학교 세라믹연구소 2015 Journal of Ceramic Processing Research Vol.16 No.1
Photoluminescence properties of bulk and microstructured ZnO crystals are investigated for potential scintillator applications. A bulk crystal is prepared by hydrothermal method, while hexagonal micron-sized crystals are prepared by aqueous chemical growth and carbothermal reduction methods. The bulk sample exhibits UV emission only, while the microstructured samples exhibit both UV and visible emissions. The ZnO microstructures have faster near-band edge emission lifetimes of 100 to 800 ps compared to 440 ps and 2 ns of bulk ZnO. No direct correlation between the defect-related emissions and the near-band edge emission has been observed. ZnO microstructures with fast luminescence lifetimes have promising applications as EUV lithography and XFELs scintillators.
Hikari Nitta,Nobukazu Hoshi,Koki Ishizuka,Kazuhito Fukuda 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Hydrogen engine generator has attracted attention because it is cheaper than fuel cells and does not emit CO₂. However, hydrogen flow rate must be controlled appropriately according to output power, which changes depending on the load. If the hydrogen flow rate input into the engine was not controlled appropriately, the output voltage is dropped or the fuel efficiency becomes worse. In this paper, output voltage control of a hydrogen engine generator using a hill climbing method with an evaluation function simulating a quadratic function is proposed. It is clarified by experiments that the output voltage of the generator can be controlled to a constant value by applying the hill climbing method with the evaluation function even when the load fluctuates. In addition, it is shown that the response time can be shortened by 0.4 sec with the same system configuration as the previously proposed PI controlled system.