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1. Analysis of Climate Conditions upon Driving Distance of Vehicle Integrated Photovoltaics‐Powered Vehicles

Author

Yamaguchi, Masafumi, primary, Nakamura, Kyotaro, additional, Ozaki, Ryo, additional, Kojima, Nobuaki, additional, Ohshita, Yoshio, additional, Masuda, Taizo, additional, Okumura, Kenichi, additional, Mabuchi, Takashi, additional, Satou, Akinori, additional, Tanimoto, Tsutomu, additional, Tomita, Yosuke, additional, Zushi, Yusuke, additional, Nakado, Takashi, additional, Yamada, Kazumi, additional, Thiel, Christian, additional, Tsakalidis, Anastasios, additional, Jaeger‐Waldau, Arnulf, additional, Takamoto, Tatsuya, additional, Araki, Kenji, additional, Ota, Yasuyuki, additional, and Nishioka, Kensuke, additional

Published
2023
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3. Analysis of Climate Conditions upon Driving Distance of Vehicle Integrated Photovoltaics‐Powered Vehicles.

Author

Yamaguchi, Masafumi, Nakamura, Kyotaro, Ozaki, Ryo, Kojima, Nobuaki, Ohshita, Yoshio, Masuda, Taizo, Okumura, Kenichi, Mabuchi, Takashi, Satou, Akinori, Tanimoto, Tsutomu, Tomita, Yosuke, Zushi, Yusuke, Nakado, Takashi, Yamada, Kazumi, Thiel, Christian, Tsakalidis, Anastasios, Jaeger‐Waldau, Arnulf, Takamoto, Tatsuya, Araki, Kenji, and Ota, Yasuyuki

Subjects
CARBON dioxide mitigation, TRAFFIC safety, MOTOR vehicle driving, SOLAR cells, METROPOLIS
Abstract

The development of the vehicles powered by photovoltaic (PV) is desirable and very important for reducing CO2 emissions from the transport sector to realize a decarbonized society. Although long‐distance driving of vehicle‐integrated PV (VIPV)‐powered vehicles without electricity charging is expected in sunny regions, driving distance of VIPV‐powered vehicles is affected by climate conditions such as solar irradiation and outside temperature, and the power consumption of the air conditioners. In this article, analytical results for system efficiency of VIPV‐powered vehicles and the effects of usage of air conditioner are presented by using power losses estimated from the electric mileage by using the driving distance data for Toyota Prius and Nissan Van demonstration cars installed with high‐efficiency InGaP/GaAs/InGaAs three‐junction solar cell modules with a module efficiency of more than 30%. The potential of VIPV‐powered vehicles to be deployed in major cities in Japan and the world is also analyzed. Mild weather cities such as Miyazaki in Japan and Sydney in Australia are thought to have longer driving range even under usage of air conditioners. The other power losses for the VIPV such as temperature rise of VIPV modules and partial shading estimate the previous data and some reference as well as effects of usage of air‐conditioners are also discussed in this article. [ABSTRACT FROM AUTHOR]

Published
2024
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6. Design and analysis of hybrid concentrator photovoltaic module combining low-concentration static lens and luminescent solar concentrator for automobile applications.

Author

Sato, Daisuke, Tomizawa, Ryota, Masuda, Taizo, Okumura, Kenichi, and Yamada, Noboru

Subjects
SOLAR concentrators, COMPOUND parabolic concentrators, SOLAR energy, SOLAR power plants, AUTOMOBILES, AUTOMOBILE showrooms, CURVED surfaces
Abstract

A hybrid concentrator photovoltaic (CPV) module combining low-concentration static lens and luminescent solar concentrator (LSC) was proposed to achieve the desirable characteristics for automobile applications (i.e., high electricity yields, compatibility to 3D curved surface, light weight, and aesthetics). The ray-tracing simulation results demonstrated that the annual optical efficiency of the hybrid CPV module with geometrical concentration ratio of 3.5× both for upper CPV, employing crossed compound parabolic concentrator lens, and lower LSC achieves to 58.5% based on the annual solar energy on the horizontal surface at Tokyo (Japan). The indoor experiment using a prototype module confirmed the feasibility of angle-dependent color switching of the lens aperture. [ABSTRACT FROM AUTHOR]

Published
2023
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8. Analysis of Coronary Arterial Aneurysm Regression in Patients With Kawasaki Disease by Aneurysm Severity: Factors Associated With Regression

Author

Kato, Taichi, primary, Miura, Masaru, additional, Kobayashi, Tohru, additional, Kaneko, Tetsuji, additional, Fukushima, Naoya, additional, Suda, Kenji, additional, Maeda, Jun, additional, Shimoyama, Shinya, additional, Shiono, Junko, additional, Hirono, Keiichi, additional, Ikeda, Kazuyuki, additional, Sato, Seiichi, additional, Numano, Fujito, additional, Mitani, Yoshihide, additional, Waki, Kenji, additional, Ayusawa, Mamoru, additional, Fukazawa, Ryuji, additional, Fuse, Shigeto, additional, Hamaoka, Kenji, additional, Kato, Taichi, additional, Kato, Hitoshi, additional, Saji, Tsutomu, additional, Yamagishi, Hiroyuki, additional, Tomotsune, Masako, additional, Yoshida, Makiko, additional, Toyono, Manatomo, additional, Furuno, Kenji, additional, Iwashima, Satoru, additional, Moritou, Yuji, additional, Kamada, Masahiro, additional, Takeda, Atsuhito, additional, Sano, Tetsuya, additional, Omori, Daisuke, additional, Fukasawa, Yoshie, additional, Mii, Sayaka, additional, Nomura, Yuichi, additional, Nakamura, Tsuneyuki, additional, Ishii, Masahiro, additional, Ogata, Syohei, additional, Kitagawa, Atushi, additional, Yamamoto, Masaki, additional, Yamamura, Kenichiro, additional, Masuda, Hiroshi, additional, Kaneko, Masahide, additional, Kawamura, Yoichi, additional, Komori, Akiko, additional, Suzuki, Hiroshi, additional, Watanabe, Kenichi, additional, Hayashi, Miyuki, additional, Watanabe, Makoto, additional, Kuraishi, Kenji, additional, Nishihara, Eiki, additional, Katayama, Hiroshi, additional, Okumura, Kenichi, additional, Takahashi, Tsutomu, additional, Horita, Norihisa, additional, Matsuzaki, Satoshi, additional, Motoki, Noriko, additional, Akazawa, Yohei, additional, Aso, Kentaro, additional, Nagumo, Kiyoshi, additional, Takatuki, Shinichi, additional, Suganuma, Eisuke, additional, Matsuda, Shinichi, additional, Hayabuchi, Yasunobu, additional, Doi, Shouzaburoh, additional, Honda, Takafumi, additional, Terai, Masaru, additional, and Miyamoto, Tomoyuki, additional

Published
2023
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10. Analysis for the Potential of High‐Efficiency and Low‐Cost Vehicle‐Integrated Photovoltaics

Author

Yamaguchi, Masafumi, primary, Nakamura, Kyotaro, additional, Ozaki, Ryo, additional, Kojima, Nobuaki, additional, Ohshita, Yoshio, additional, Masuda, Taizo, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Nakado, Takashi, additional, Yamada, Kazumi, additional, Tanimoto, Tsutomu, additional, Zushi, Yusuke, additional, Takamoto, Tatsuya, additional, Araki, Kenji, additional, Ota, Yasuyuki, additional, and Nishioka, Kensuke, additional

Published
2022
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12. Analysis for the Potential of High‐Efficiency and Low‐Cost Vehicle‐Integrated Photovoltaics.

Author

Yamaguchi, Masafumi, Nakamura, Kyotaro, Ozaki, Ryo, Kojima, Nobuaki, Ohshita, Yoshio, Masuda, Taizo, Okumura, Kenichi, Satou, Akinori, Nakado, Takashi, Yamada, Kazumi, Tanimoto, Tsutomu, Zushi, Yusuke, Takamoto, Tatsuya, Araki, Kenji, Ota, Yasuyuki, and Nishioka, Kensuke

Abstract

The spread of the photovoltaic‐powered electric vehicle (PV‐EV) is desirable and is essential for reduction in CO2 emissions, increasing electric range, and creating a new clean energy infrastructure based on PVs. Development of highly efficient PV modules with reasonable cost is necessary to realize a longer PV‐driving range of passenger cars. Herein, the potential of various solar cell modules for vehicle‐integrated photovoltaic (VIPV) applications is analyzed. This article shows that the use of highly efficient solar cell modules with an efficiency of higher than 35% enables longer than 30 km day−1 PV driving under average irradiance of 4 kWh m−2 day−1 without external charging. Cost reduction of VIPV modules is also very important for spreading the PV‐powered vehicles. By considering electricity charging cost saving and reduction in CO2 emission of electric vehicles, the cost target of VIPV is discussed. The cost targets of the solar cell modules for the PV‐EV by considering only electricity charging cost saving, $2.6/Wp for a module with conversion efficiency of 20% and $3.7/Wp for a module with that of 40%, are estimated in the case of electric mileage of 10 km kWh−1. [ABSTRACT FROM AUTHOR]

Published
2023
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19. Analysis of temperature coefficients and their effect on efficiency of solar cell modules for photovoltaics-powered vehicles

Author

Yamaguchi, Masafumi, primary, Masuda, Taizo, additional, Araki, Kenji, additional, Ota, Yasuyuki, additional, Nishioka, Kensuke, additional, Takamoto, Tatsuya, additional, Thiel, Christian, additional, Tsakalidis, Anastasios, additional, Jaeger-Waldau, Arnulf, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Nakado, Takashi, additional, Yamada, Kazumi, additional, Zushi, Yusuke, additional, Tanimoto, Tsutomu, additional, Nakamura, Kyotaro, additional, Ozaki, Ryo, additional, Kojima, Nobuaki, additional, and Ohshita, Yoshio, additional

Published
2021
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20. Development of High‐Efficiency Solar Cell Modules for Photovoltaic‐Powered Vehicles

Author

Yamaguchi, Masafumi, primary, Ozaki, Ryo, additional, Nakamura, Kyotaro, additional, Lee, Kan-Hua, additional, Kojima, Nobuaki, additional, Ohshita, Yoshio, additional, Masuda, Taizo, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Nakado, Takashi, additional, Yamada, Kazumi, additional, Araki, Kenji, additional, Ota, Yasuyuki, additional, Nishioka, Kensuke, additional, Takamoto, Tatsuya, additional, Zushi, Yusuke, additional, Tanimoto, Tsutomu, additional, Thiel, Christian, additional, Tsakalidis, Anastasios, additional, and Jäger-Waldau, Arunulf, additional

Published
2021
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21. Analysis for Expansion of Driving Distance and CO2 Emission Reduction of Photovoltaic-Powered Vehicles

Author

Yamaguchi, Masafumi, Masuda, Taizo, Nakado, Takashi, Yamada, Kazumi, Okumura, Kenichi, Satou, Akinori, Ota, Yasuyuki, Araki, Kenji, Nishioka, Kensuke, Kojima, Nobuaki, and Ohshita, Yoshio

Abstract

Development of photovoltaic (PV)-powered vehicles is very important to play a critical role in a future carbon neutrality society because it has been reported that the vehicle integrated PVs (VIPVs) have great ability to reduce CO2 emission from the transport sector. Usage of high-efficiency solar cell modules is essential due to the limited installable area of PV on vehicle exterior. This article presents test driving data of the Toyota Prius demonstration car installed with high-efficiency III-V compound triple-junction solar cell module with an efficiency of more than 30%. Average daily driving distance (DD) of 17 km/day under usage of air conditioning and 62% CO2 emission reduction are demonstrated by actual driving in Nagoya, Japan. In addition, analytical results for impact of high-efficiency VIPV modules of more than 35% on increases in DD of more than 30 km/day average and reducing CO2 emission of PV-powered vehicles of more than 70% reduction are also shown.

Published
2023
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23. Potential of Si Tandem Solar Cell Modules for PV-Powered Vehicles

Author

Yamaguchi, Masafumi, primary, Araki, Kenji, additional, Ota, Yasuyuki, additional, Nishioka, Kensuke, additional, Takamoto, Tatsuya, additional, Masuda, Taizo, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Nakado, Takashi, additional, Yamada, Kazumi, additional, Zushi, Yusuke, additional, Tanimoto, Tsutomu, additional, Nakamura, Kyotaro, additional, Ozaki, Ryo, additional, Kojima, Nobuaki, additional, and Ohshita, Yoshio, additional

Published
2021
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24. Development of High‐Efficiency Solar Cell Modules for Photovoltaic‐Powered Vehicles.

Author

Yamaguchi, Masafumi, Ozaki, Ryo, Nakamura, Kyotaro, Lee, Kan-Hua, Kojima, Nobuaki, Ohshita, Yoshio, Masuda, Taizo, Okumura, Kenichi, Satou, Akinori, Nakado, Takashi, Yamada, Kazumi, Araki, Kenji, Ota, Yasuyuki, Nishioka, Kensuke, Takamoto, Tatsuya, Zushi, Yusuke, Tanimoto, Tsutomu, Thiel, Christian, Tsakalidis, Anastasios, and Jäger-Waldau, Arunulf

Subjects
SOLAR cells, PHOTOVOLTAIC power systems, SOLAR cell efficiency, CARBON offsetting, CARBON emissions, AUTOMOBILE license plates
Abstract

Photovoltaic (PV)‐powered vehicles are expected to play a critical role in a future carbon neutral society because it has been reported that the onboard PVs have great ability to reduce CO2 emission from the transport sector. Although the demonstration car with a III−V‐based solar cell module has shown the PV‐powered driving range of 36.6 km day−1 at solar irradiance of 6.2 kWh m−2 day−1, practical driving ranges of PV‐powered vehicles are shown to be lower than estimated values due to some losses such as nonradiative recombination and resistance losses of solar cell modules under sunshine condition. This article presents analytical results for the effects of illumination intensity properties of various solar cell modules on the PV‐powered driving range to develop highly efficient solar cell modules for vehicle‐integrated applications. The analysis shows that improvements in shunt resistance and saturation current density of solar cell modules are necessary to improve illumination intensity properties of solar cell modules under low intensity sunshine condition. The calculations show that the III−V‐based 3‐junction solar cell modules with an efficiency of more than 30% have a potential PV‐powered driving range of 30 km/day average and more than 50 km day−1 on a clear day. [ABSTRACT FROM AUTHOR]

Published
2022
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25. Importance of Developing Photovoltaics-Powered Vehicles

Author

Yamaguchi, Masafumi, primary, Masuda, Taizo, additional, Nakado, Takashi, additional, Zushi, Yusuke, additional, Araki, Kenji, additional, Takamoto, Tatsuya, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Yamada, Kazumi, additional, Ota, Yasuyuki, additional, Nishioka, Kensuke, additional, Tanimoto, Tsutomu, additional, Nakamura, Kyotaro, additional, Ozaki, Ryo, additional, Kojima, Nobuaki, additional, and Ohshita, Yoshio, additional

Published
2021
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26. Development of high‐efficiency and low‐cost solar cells for PV‐powered vehicles application

Author

Yamaguchi, Masafumi, primary, Masuda, Taizo, additional, Araki, Kenji, additional, Sato, Daisuke, additional, Lee, Kan‐Hua, additional, Kojima, Nobuaki, additional, Takamoto, Tatsuya, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Yamada, Kazumi, additional, Nakado, Takashi, additional, Zushi, Yusuke, additional, Ohshita, Yoshio, additional, and Yamazaki, Mitsuhiro, additional

Published
2020
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28. Role of PV-Powered Vehicles in Low-Carbon Society and Some Approaches of High-Efficiency Solar Cell Modules for Cars

Author

Yamaguchi, Masafumi, primary, Masuda, Taizo, additional, Araki, Kenji, additional, Sato, Daisuke, additional, Lee, Kan-Hua, additional, Kojima, Nobuaki, additional, Takamoto, Tatsuya, additional, Okumura, Kenichi, additional, Satou, Akinori, additional, Yamada, Kazumi, additional, Nakado, Takashi, additional, Zushi, Yusuke, additional, Yamazaki, Mitsuhiro, additional, and Yamada, Hiroyuki, additional

Published
2020
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29. Development of high‐efficiency and low‐cost solar cells for PV‐powered vehicles application.

Author

Yamaguchi, Masafumi, Masuda, Taizo, Araki, Kenji, Sato, Daisuke, Lee, Kan‐Hua, Kojima, Nobuaki, Takamoto, Tatsuya, Okumura, Kenichi, Satou, Akinori, Yamada, Kazumi, Nakado, Takashi, Zushi, Yusuke, Ohshita, Yoshio, and Yamazaki, Mitsuhiro

Subjects
SOLAR cells, PHOTOVOLTAIC power systems, SOLAR cell efficiency, CLEAN energy, PHOTOVOLTAIC power generation
Abstract

Development of high‐efficiency solar cell modules and new application fields are significant for the further development of photovoltaics (PVs) and the creation of new clean energy infrastructure based on PV. Notably, the development of PV‐powered vehicle applications is desirable and very important for this end. According to the NEDO's Interim Report "PV‐Powered Vehicle Strategy Committee," a new broader PV markets with more than 10 GW and 50 GW in 2030 and 2040, respectively, are expected to be established when PV‐powered vehicles are developed. Cumulative PV capacity for PV‐powered vehicles will be 50 GW and 0.4 TW in 2030 and 2040, respectively. This paper presents impacts on efficiency and cost for PV‐powered vehicles. According to our survey, the use of more than 30% of high‐efficiency PV enables 30 km per day driving without external charging and the society that the majority of the family cars run by the sunlight and without supplying gas. Thus, we are developing high‐efficiency and low‐cost solar cells and modules for automobile applications. In this paper, our analytical results for the efficiency potential of various solar cells for choosing candidates of high‐efficiency solar cell modules for automobile applications. This paper also presents our recent approaches: demonstration car (Toyota Prius PHV) by using Sharp's high‐efficiency III‐V triple‐junction solar cell modules with an output power of 860 W, static low concentrator InGaP/GaAs/InGaAs triple‐junction solar cell module with efficiency of 32.84%, and so forth. [ABSTRACT FROM AUTHOR]

Published
2021
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30. Puzzling (IRIDA-Like and Hemolytic) Anemia in a Child With Idiopathic Pulmonary Hemosiderosis

Author

Nishikado, Motokazu, Awaguni, Hitoshi, Shinozuka, Jun, Okumura, Kenichi, and Imashuku, Shinsaku

Abstract

Before the diagnosis of idiopathic pulmonary hemosiderosis (IPH), unexplained or puzzling anemia may precede and delay in the diagnosis of pediatric IPH is common. A 5.8 years old female child initiated with iron-refractory iron deficiency anemia-like iron deficiency and hemolytic anemia and at 6.8 years of age IPH was materialized, when the patient showed the triad signs of IPH with hemosiderin-laden alveolar macrophages in gastric aspirate. Although time to the diagnosis was previously reported to be ranged from 16 to 30 months, in our case it took 12 months from the initial anemia to IPH diagnosis.

Published
2022
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31. Experimental Right Ventricular Hypertension Induces Regional β1‐Integrin–Mediated Transduction of Hypertrophic and Profibrotic Right and Left Ventricular Signaling

Author

Sun, Mei, primary, Ishii, Ryo, additional, Okumura, Kenichi, additional, Krauszman, Adrienn, additional, Breitling, Siegfried, additional, Gomez, Olga, additional, Hinek, Aleksander, additional, Boo, Stellar, additional, Hinz, Boris, additional, Connelly, Kim A., additional, Kuebler, Wolfgang M., additional, and Friedberg, Mark K., additional

Published
2018
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35. Evaluation of Cryogenic Readout Circuits with GaAs JFETs for Far-Infrared Detectors

Author

OKUMURA, Kenichi and HIROMOTO, Norihisa

Abstract

The characteristics of gallium arsenide junction field-effect transistors (GaAs JFETs)and the performance of cryogenic readout circuits using GaAs JFETs for two-dimensional far-infrared arrays are evaluated at cryogenic temperature. We fabricated the GaAs JFETs withvarious gate sizes ranging from W/L = 5μm/0.5μm to 200μm/200μm to systematically measuretheir static characteristics and low-frequency noise spectra. We found that the low-frequency noisevoltage depends on the device size in the saturation region of GaAs JFETs at 4.2 K, and the powerdensity of the noise voltage is inversely proportional to the gate area. These findings allowed usto determine the Hooge parameter of the GaAs JFET at 4.2 K to be 4×10-5, assuming that thecarrier mobility is 1.5×10+3 cm2/Vs. On the other hand, we did not find the obvious correlationbetween the low-frequency noise and gate size in the ohmic region of GaAs JFETs. Based on thesemeasurements for GaAs JFETs, we fabricated and tested a dual GaAs JFET, a source-follower-per-detector (SFD) circuit, and a 20×3 channel SFD circuit array. The Common-Mode-Rejection-Ratio(CMRR) of the dual GaAs JFET with W/L = 50μm/20μm at 4.2 K was determined to be 40-60dB under small power dissipation. The performance of SFD circuits and the 20×3 channel SFDarrays for two-dimensional far-infrared Ge:Ga detector readouts are currently being evaluated., 資料番号: SA4618377000

Published
2000

36. Compact Two-Dimensional Array of Stressed GE:GA Detectors

Author

Doi, Yasuo, Makiuti, Shin'ichiro, Okuda, Haruyuki, Nakagawa, Takao, Shibai, Hiroshi, Kawada, Mitsunobu, Hiromoto, Norihisa, Fujiwara, Mikio, and Okumura, Kenichi

Abstract

Accepted: 1999-02-08, 資料番号: SA1001842000

Published
2000

42. Coronary Spastic Angina in Two Pediatric Patients

Author

Odanaka, Yutaka, primary, Okumura, Kenichi, additional, Ozaki, Noriyasu, additional, Kishi, Kanta, additional, Mori, Yasuhiko, additional, Katayama, Hiroshi, additional, Tanabe, Takuya, additional, and Tamai, Hiroshi, additional

Published
2012
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49. Human chymase degrades human fibronectin

Author

Okumura, Kenichi, primary, Takai, Shinji, additional, Muramatsu, Michiko, additional, Katayama, Satoshi, additional, Sakaguchi, Masato, additional, Kishi, Kanta, additional, Jin, Denan, additional, and Miyazaki, Mizuo, additional

Published
2004
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