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Akiyama, Yoko,Li, Suqin,Akiyama, Koshiro,Mori, Tatsuya,Okada, Hidehiko,Hirota, Noriyuki,Yamaji, Tsuyoshi,Matsuura, Hideki,Namba, Seitoku,Sekine, Tomokazu,Mishima, Fumihito,Nishijima, Shigehiro The Korean Society of Superconductivity and Cryoge 2021 한국초전도저온공학회논문지 Vol.23 No.3
The reduction of carbon dioxide emissions becomes a global issue, the main source of carbon dioxide emissions in the Asian region is the energy conversion sector, especially coal-fired power plants. We are working to develop technologies that will at least limit the increase in carbon dioxide emissions from the thermal power plants as one way to reduce carbon dioxide emissions. Our research aims to reduce carbon dioxide emissions by removing iron oxide scale from the feedwater system of thermal power plants using a superconducting high-gradient magnetic separation (HGMS) system, thereby reducing the loss of power generation efficiency. In this paper, the background of thermal power plants in Asia is outlined, followed by a case study of the introduction of a chemical cleaning line at an actual thermal power plant in Japan, and the possibility of introducing it into the thermal power plants in China based on the results.
Yoko Akiyama,Suqin Li,Koshiro Akiyama,Tatsuya Mori,Hidehiko Okada,Noriyuki Hirota,Tsuyoshi Yamaji,Hideki Matsuura,Seitoku Namba,Tomokazu Sekine,Fumihito Mishima,Shigehiro Nishijima 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.3
The reduction of carbon dioxide emissions becomes a global issue, the main source of carbon dioxide emissions in the Asian region is the energy conversion sector, especially coal-fired power plants. We are working to develop technologies that will at least limit the increase in carbon dioxide emissions from the thermal power plants as one way to reduce carbon dioxide emissions. Our research aims to reduce carbon dioxide emissions by removing iron oxide scale from the feedwater system of thermal power plants using a superconducting high-gradient magnetic separation (HGMS) system, thereby reducing the loss of power generation efficiency. In this paper, the background of thermal power plants in Asia is outlined, followed by a case study of the introduction of a chemical cleaning line at an actual thermal power plant in Japan, and the possibility of introducing it into the thermal power plants in China based on the results.
First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
A Systematic Review of the Economic Evaluation of Telemedicine in Japan
Akiyama, Miki,Yoo, Byung-Kwang The Korean Society for Preventive Medicine 2016 예방의학회지 Vol.49 No.4
Objectives: There is no systematic review on economic evaluations of telemedicine in Japan, despite over 1000 trials implemented. Our systematic review aims to examine whether Japan's telemedicine is cost-saving or cost-effective, examine the methodological rigorousness of the economic evaluations, and discuss future studies needed to improve telemedicine's financial sustainability. Methods: We searched five databases, including two Japanese databases, to find peer-reviewed articles published between January 1, 2000 and December 31, 2014 in English and Japanese that performed economic evaluations of Japan's telemedicine programs. The methodological rigorousness of the economic analyses was assessed with a well-established checklist. We calculated the benefit-to-cost ratio (BCR) when a reviewed study reported related data but did not report the BCR. All cost values were adjusted to 2014 US dollars. Results: Among the 17 articles identified, six studies reported on settings connecting physicians for specialist consultations, and eleven studies on settings connecting healthcare providers and patients at home. There are three cost-benefit analyses and three cost-minimization analyses. The remaining studies measured the benefit of telemedicine only, using medical expenditure saved or users' willingness-to-pay. There was substantial diversity in the methodological rigorousness. Studies on teledermatology and teleradiology indicated a favorable level of economic efficiency. Studies on telehomecare gave mixed results. One cost-benefit analysis on telehomecare indicated a low economic efficiency, partly due to public subsidy rules, e.g., a too short budget period. Conclusions: Overall, telemedicine programs in Japan were indicated to have a favorable level of economic efficiency. However, the scarcity of the economic literature indicates the need for further rigorous economic evaluation studies.
Construction of an Oil Pump Rotor Production Line with High Productivity
Akiyama Kazunari 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
New product line with additional secondary operation of oil pump rotor was built in necessity of increasing capacity. This new line includes steam treatment process after sizing. The new line achieved 1.6 times higher performance compared with a conventional line.
First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1
Vibration isolation system with a compact damping system for power recycling mirrors of KAGRA
Akiyama, Y,Akutsu, T,Ando, M,Arai, K,Arai, Y,Araki, S,Araya, A,Aritomi, N,Asada, H,Aso, Y,Bae, S,Baiotti, L,Barton, M A,Cannon, K,Capocasa, E,Chen, C-S,Chiu, T-W,Cho, K,Chu, Y-K,Craig, K,Dattilo, V,Do Institute of Physics 2019 Classical and quantum gravity Vol.36 No.9
<P>A vibration isolation system called the Type-Bp system used for power recycling mirrors has been developed for KAGRA, the interferometric gravitational-wave observatory in Japan. A suspension of the Type-Bp system passively isolates an optic from seismic vibration using three main pendulum stages equipped with two vertical vibration isolation systems. A compact reaction mass around each of the main stages allows for achieving sufficient damping performance with a simple feedback as well as vibration isolation ratio. Three Type-Bp systems were installed in KAGRA, and were proved to satisfy the requirements on the damping performance, and also on estimated residual displacement of the optics.</P>
Algorithm for determining pure pointedness of self-affine tilings
Akiyama, S.,Lee, J.Y. Academic Press ; Elsevier Science B.V. Amsterdam 2011 Advances in mathematics Vol.226 No.4
Overlap coincidence in a self-affine tiling in R<SUP>d</SUP> is equivalent to pure point dynamical spectrum of the tiling dynamical system. We interpret the overlap coincidence in the setting of substitution Delone set in R<SUP>d</SUP> and find an efficient algorithm to check the pure point dynamical spectrum. This algorithm is easy to implement into a computer program. We give the program and apply it to several examples. In the course of the proof of the algorithm, we show a variant of the conjecture of Urbanski (Solomyak (2006) [40]) on the Hausdorff dimension of the boundaries of fractal tiles.
First M87 Event Horizon Telescope Results. II. Array and Instrumentation
Akiyama, Kazunori,Alberdi, Antxon,Alef, Walter,Asada, Keiichi,Azulay, Rebecca,Baczko, Anne-Kathrin,Ball, David,Baloković,, Mislav,Barrett, John,Bintley, Dan,Blackburn, Lindy,Boland, Wilfred,Bouma American Astronomical Society 2019 ASTROPHYSICAL JOURNAL LETTERS - Vol.875 No.1