NISHIOKA Kensuke

写真a

Affiliation

Engineering educational research section Research & Development Center for Sustanable Energy and Environmental Engineering

Title

Professor

External Link

Degree 【 display / non-display

  • Doctor (Engineering) ( 2004.3   Nara Institute of Science and Technology )

Research Areas 【 display / non-display

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Electric and electronic materials

 

Papers 【 display / non-display

  • 3D Solar Irradiance Model for Non-Uniform Shading Environments Using Shading (Aperture) Matrix Enhanced by Local Coordinate System Reviewed

    Araki K., Ota Y., Nagaoka A., Nishioka K.

    Energies   16 ( 11 )   2023.6

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Energies  

    Building-integrated photovoltaics (BIPVs) and vehicle-integrated photovoltaics (VIPVs) receive solar irradiance through non-uniform shading objects. Standard scalar calculations cannot accurately determine the solar irradiance of BIPV and VIPV systems. This study proposes a matrix model using an aperture matrix to accurately calculate the horizontal and vertical planes affected by non-uniform shading objects. This can be extended to the solar irradiance on a VIPV by applying a local coordinate system. The 3D model is validated by a simultaneous measurement of five orientations (roof and four sides, front, left, tail, and right) of solar irradiance on a car body. An accumulated logistic function can approximate the shading probability. Furthermore, the combined use of the 3D solar irradiance model is effective in assessing the energy performance of solar electric vehicles in various zones, including buildings, residential areas, and open spaces. Unlike standard solar energy systems, the energy yield of a VIPV is affected by the shading environment. This, in turn, is affected mainly by the location of vehicle travel or parking in the city rather than by the climate zones of the city.

    DOI: 10.3390/en16114414

    Scopus

  • Direct Observation of Group-V Dopant Substitutional Defects in CdTe Single Crystals Reviewed

    Nagaoka A., Kimura K., Ang A.K.R., Takabayashi Y., Yoshino K., Sun Q., Dou B., Wei S.H., Hayashi K., Nishioka K.

    Journal of the American Chemical Society   145 ( 16 )   9191 - 9197   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Journal of the American Chemical Society  

    Point defect chemistry strongly affects the fundamental properties of materials and has a decisive impact on device performance. The Group-V dopant is prominent acceptor species with high hole concentration in CdTe; however, its local atomic structure is still not clear owing to difficulties in definitive measurements and discrepancies between experimental observations and theoretical models. Herein, we report on direct observation of the local structure for the As dopant in CdTe single crystals by the X-ray fluorescence holography (XFH) technique, which is a powerful tool to visualize three-dimensional atomic configurations around a specific element. The XFH result shows the As substituting on both Cd (AsCd) and Te (AsTe) sites. Although AsTe has been well known as a shallow acceptor, AsCd has not attracted much attention and been discussed so far. Our results provide new insights into point defects by expanding the experimental XFH study in combination with theoretical first-principles studies in II-VI semiconductors.

    DOI: 10.1021/jacs.3c01248

    Scopus

  • Solar Electric Vehicles as Energy Sources in Disaster Zones: Physical and Social Factors Reviewed

    Araki K., Ota Y., Maeda A., Kumano M., Nishioka K.

    Energies   16 ( 8 )   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Energies  

    Electric vehicles (EVs) have the advantage of being resilient to natural disasters. However, users hesitate to donate electricity when they lose the chance to recharge at the utility. Solar electric vehicles (SEVs) save energy through vehicle-integrated photovoltaics (VIPV) and make it possible to voluntarily donate excess energy, thus maintaining facility resilience. Given that the supply of solar energy to VIPV systems is not continuous and is difficult to forecast, the contribution of VIPV to the resilience of the larger energy system has been called into question. This is the first study in which the potential of VIPV to maintain utility resilience is investigated in the context of physical factors, such as irradiance, and social factors. The actual energy yield of a VIPV car was determined using an advanced 3D solar irradiation model under a nonuniform shading distribution, with validation from actual measures of solar irradiance on five orthogonal sides of the car body. The Monte Carlo method was used to model the complex factors in VIPV energy storage and energy donations under different scenarios. Depending on the climate, population density, and shading environment, the voluntary contribution of stored electricity in SEV is sufficient to provide disaster relief support.

    DOI: 10.3390/en16083580

    Scopus

  • Estimation Model of Agrivoltaic Systems Maximizing for Both Photovoltaic Electricity Generation and Agricultural Production Reviewed

    Yajima D., Toyoda T., Kirimura M., Araki K., Ota Y., Nishioka K.

    Energies   16 ( 7 )   2023.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Energies  

    Climate change and increasing food demand are global issues that require immediate attention. The agrivoltaic system, which involves installing solar panels above farmland, can simultaneously solve climate and food issues. However, current systems tend to reduce agricultural production and delay the harvest period due to shading by the solar panels. A delayed harvest period impacts the income of farmers who wish to sell produce at specific times. Incorporating a model that calculates the amount of electricity generated by solar irradiation, this study establishes a model to estimate the correct start date of cultivation for solar panel covered crops to ensure the correct harvest date and determines the expected income of farmers by calculating agricultural production and power generation. Using taro cultivation in Miyazaki Prefecture as a case study, the model estimated that the start date of cultivation should be brought forward by 23 days to ensure the ideal harvest period and agricultural production. This would prevent an opportunity loss of USD 16,000 per year for a farm area of 10,000 m2. Furthermore, an additional income of USD 142,000 per year can be expected by adjusting shading rates for the cultivation and non-cultivation periods.

    DOI: 10.3390/en16073261

    Scopus

  • Electrode Shape Dependence of InGaAsP Photovoltaic Characteristics under Laser Irradiation for Optical Wireless and Fiber Power Transmission Reviewed

    Masakazu ARAI, Akira KUSHIYAMA, Yuga MOTOMURA, and Kensuke NISHIOKA

    The Review of Laser Engineering   51 ( 3 )   171 - 175   2023.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)  

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Books 【 display / non-display

  • 水素の製造、輸送・貯蔵技術と材料開発 事例集

    西岡賢祐( Role: Contributor)

    ㈱技術情報協会  2019.4 

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    Language:Japanese Book type:Scholarly book

  • Concentrator Photovoltaic Systems: Introduction, Wiley Encyclopedia of Electrical and Electronics Engineering

    Kensuke Nishioka, Yasuyuki Ota( Role: Joint author)

    John Wiley & Sons, Inc.  2017.11 

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    Total pages:12   Responsible for pages:12   Language:English Book type:Dictionary, encyclopedia

  • 太陽熱発電の最新動向

    西岡賢祐 (玉浦裕 監修)( Role: Joint author)

    シーエムシー出版  2014.11 

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    Language:Japanese Book type:Scholarly book

  • 新太陽エネルギー利用ハンドブック 第Ⅴ編 太陽光発電技術

    西岡賢祐( Role: Joint author)

    一般社団法人日本太陽エネルギー学会  2013.12 

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    Language:Japanese Book type:Scholarly book

  • 高効率太陽電池

    山口真史 監修( Role: Joint author)

    NTS出版  2012.5 

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    Language:Japanese Book type:Scholarly book

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MISC 【 display / non-display

  • 太陽光由来の貯蔵可能燃料 Invited

    西岡賢祐

    カーボン・エネルギーコントロール社会協議会 (CanApple): CanAppleニュース   ( 230 )   2022.4

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:一般財団法人光産業技術振興協会  

  • 世界一の効率を達成した太陽光からの水素製造 Invited

    西岡 賢祐

    経済産業省 九州経済産業局 水素とともに描く地域・企業の未来 事例から紐解く!九州水素ガイドブック   ( 49 )   2022.4

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    Authorship:Lead author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (other)  

  • MBD活用デジタル制御の太陽光発電・水素製造システム Invited

    中島 善康、米澤 遊、太田 靖之、西岡 賢祐

    エネルギー・資源   43 ( 251 )   44 - 49   2022.1

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:一般財団法人光産業技術振興協会  

  • 最新の太陽光発電応用技術 Invited Reviewed

    西岡賢祐

    オプトニューズ テクノロジートレンド   15 ( 3 )   16 - 20   2020.9

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)   Publisher:一般財団法人光産業技術振興協会  

  • Multivariate Analysis Using R for Various Climatic Effects on the Output Performances of CIGS and Multi-Crystalline Si Photovoltaic Systems Installed in Miyazaki, Japan

    Kyaw Myo WIN, Yasuyuki OTA, Kensuke NISHIOKA, Tatsuya SAKODA, Noriyuki HAYASHI

    宮崎大学工学部紀要   49   119 - 127   2020.9

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (bulletin of university, research institution)   Publisher:国立大学法人宮崎大学  

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Presentations 【 display / non-display

  • Impact of the partial shading distribution on the output of the vehicle-integrated photovoltaic module International conference

    Yasuyuki Ota, Kenji Araki, Kensuke Nishioka

    PV in Motion 2023  (1931 Congress Center in 's-Hertogenbosch, the Netherlands + Online)  PV in Motion 2023

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    Event date: 2023.2.15 - 2023.2.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:1931 Congress Center in 's-Hertogenbosch, the Netherlands + Online  

  • Estimation of the energy yield of VIPV affected by its specific solar environment International conference

    Yasuyuki Ota, Kenji Araki, Yuki Kawakami, Sho Kuranaga, Kento Hirata, Koki Nakamura, Kensuke Nishioka

    PV in Motion 2023  (1931 Congress Center in 's-Hertogenbosch, the Netherlands + Online)  PV in Motion 2023

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    Event date: 2023.2.15 - 2023.2.17

    Language:English   Presentation type:Oral presentation (general)  

    Venue:1931 Congress Center in 's-Hertogenbosch, the Netherlands + Online  

  • デバイス化を目的としたCu2ZnSnS4の伝導型制御と伝導メカニズムの変化

    岡本晃一, 永岡章, 吉野賢二, 西岡賢祐

    応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会  (県電ホール, 宮崎県)  応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会

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    Event date: 2022.12.16 - 2022.12.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:県電ホール, 宮崎県  

  • ケステライト化合物Cu2ZnSnS4の結晶粒界による熱伝導率制御

    長友克馬, 永岡章, 吉野賢二, 西岡賢祐

    応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会  (県電ホール, 宮崎県)  応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会

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    Event date: 2022.12.16 - 2022.12.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:県電ホール, 宮崎県  

  • カルコパイライト化合物ZnSnAs2の熱電特性

    中島康貴, 永岡章, 吉野賢二, 西岡賢祐

    応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会  (県電ホール, 宮崎県)  応用物理学会 2022年度 多元系化合物・太陽電池研究会 年末講演会

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    Event date: 2022.12.16 - 2022.12.17

    Language:Japanese   Presentation type:Poster presentation  

    Venue:県電ホール, 宮崎県  

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Awards 【 display / non-display

  • 第13回半導体材料・デバイスフォーラム ポスター発表優秀賞

    2022.10   第13回半導体材料・デバイスフォーラム 実行委員会   Ag混晶による熱電変換材料(Cu1-xAgx)2ZnSnS4の伝導型制御

    岡本 晃一,永岡 章,重枝 佑輔,吉野 賢二,西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc. 

  • 第13回半導体材料・デバイスフォーラム 口頭発表優秀賞

    2022.10   第13回半導体材料・デバイスフォーラム 実行委員会   環境調和型熱電材料Cu2ZnSnS4の結晶粒界導入による熱伝導率の低下

    長友 克馬,永岡 章,岡本 晃一,西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc. 

  • 第12回半導体材料・デバイスフォーラム 口頭発表優秀賞

    2021.12   第12回半導体材料・デバイスフォーラム 実行委員会   熱電変換材料(Cu1-xAgx)2ZnSnS4の伝導型制御

    岡本 晃一,永岡 章,重枝 佑輔,吉野 賢二,西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc. 

  • 第4回フロンティア太陽電池セミナー 優秀賞

    2019.11   フロンティア太陽電池セミナー実行委員会   多接合太陽電池の出力解析モデルの確立および精度検証

    才木 大夢, 西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

  • 2019年度第16回日本熱電学会学術講演会 優秀講演賞

    2019.9   一般社団法人日本熱電学会   Se混晶によるCu2ZnSn(SXSe1-X)4単結晶のZT向上

    永岡 章, 吉野 賢二, 増田 泰造, Michael Scarpulla, 西岡 賢祐

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    Award type:Award from Japanese society, conference, symposium, etc.  Country:Japan

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Grant-in-Aid for Scientific Research 【 display / non-display

  • 固体高分子水電解における不純物起因劣化メカニズムの解明および特性回復手法の確立

    Grant number:19K12401  2019 - 2022.03

    科学研究費補助金  基盤研究(C)

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    Authorship:Principal investigator 

  • 高効率太陽電池材料の高倍率集光時におけるキャリアの動的ふるまいの解明

    2013.04 - 2018.03

    科学研究費補助金  基盤研究(B)

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    Authorship:Principal investigator 

    高効率太陽電池材料の高倍率集光時におけるキャリアの動的ふるまいの解明

  • 直線偏光Nd:YAGレーザーによる微細金属ドットの2次元規則配列加工に関する研究

    2006.04 - 2008.03

    科学研究費補助金  若手研究(B)

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    コヒーレントな直線偏光Nd:YAGパルスレーザーを試料に照射することにより溶融金属内に自発的に発生するレーザー誘導周期的エネルギー密度分布を利用し、位置と大きさを制御した規則性配列微細金属ドットの形成に取り組んだ。直線偏光Nd:YAGパルスレーザーをSi酸化膜上に堆積したニッケル薄膜に照射するだけで、位置と大きさを制御した規則性配列微細ニッケルドットを形成することに成功した。

Available Technology 【 display / non-display