2020



Aikawa, A., Kioka, A., Nakagawa, M. & Anzai, S. Nanobubbles as corrosion inhibitor in acidic geothermal fluid. Geothermics 89, 101962, doi:10.1016/j.geothermics.2020.101962 (in press).

Kioka, A. Geological Occurrence and Morphological Feature of Submarine Mud Volcanoes: A brief review. J. Geol. Soc. Jpn. 126(1), 17-28 (2020).

Matsumoto, M., Itoi, R. & Fujimitsu, Y. Numerical Study on Conditions for Generation of Periodic Wellbore Flows. Proceedings of the 45th Workshop on Geothermal Reservoir Engineering, SGP-TR-216 (2020).

McHugh, C. M., Seeber, L., Rasbury, T., Strasser, M., Kioka, A., Kanamatsu, T., Ikehara, K. & Usami, K. Isotopic and Sedimentary Signature of Megathrust Ruptures Along the Japan Subduction Margin. Marine Geology, in press (2020).

Schwestermann, T., Huang, J., Konzett, J., Kioka, A., Wefer, G., Ikehara, K., Moernaut, J., Eglinton, T. I. & Strasser, M. Multivariate statistical and multi-proxy constraints on earthquake-triggered sediment remobilization processes in the central Japan Trench. Geochem. Geophys. Geosyst. 21(6), e2019GC008861 (2020).

Usami, K., Ikehara, K., Kanamatsu, T., Kioka, A., Schwestermann, T. & Strasser, M. The link between upper-slope submarine landslides and mass transport deposits in the hadal trenches. World Landslide Forum - WLF5 (Springer), accepted (2020).

2019



Alam, B. Y. C. S. S. S., Itoi, R., Taguchi, S., Saibi, H. & Yamashiro, R. Hydrogeochemical and isotope characterization of geothermal waters from the Cidanau geothermal field, West Java, Indonesia. Geothermics 78, 62-69 (2019).

Ashat, A., Pratama, H. B. & Itoi, R. Updating conceptual model of Ciwidey-Patuha geothermal using dynamic numerical model. IOP Conference Series: Earth and Environmental Science 254, 012010 (2019).

Ashat, A., Pratama, H. B. & Itoi, R. Comparison of resource assessment methods with numerical reservoir model between heat stored and experimental design: case study Ciwidey-Patuha geothermal field. IOP Conference Series: Earth and Environmental Science 254, 012011 (2019).

Farabi-Asl, H., Chapman, A., Itaoka, K., Jalilinasrabady, S., Kato, E. & Kurosawa, A. Low-carbon power generation from geothermal resources in Japan, a techno-economic analysis by TIMES-Japan framework. Proceedings of the 5th International Conference on Polygeneration (2019).

Jalilinasrabady, S. Sustainable Development Challenges in Geothermal and Petroleum. Proceedings of the 81st EAGE Conference and Exhibition 2019, 1-6 (2019).

Khademian, Z., Kim, E. & Nakagawa, M. Simulation of lunar soil with irregularly shaped, crushable grains: Effects of grain shapes on the mechanical behaviors. Journal ofGeophysical Research: Planets 124, 1157-1176 (2019).

Kioka, A., Schwestermann, T., Moernaut, J., Ikehara, K., Kanamatsu, T., Eglinton, T. I. & Strasser, M. Event stratigraphy in a hadal oceanic trench: The Japan Trench as sedimentary archive recording recurrent giant subduction zone earthquakes and their role in organic carbon export to the deep sea. Frontiers in Earth Science 7, 319 (2019).

Nakagawa, M. Trust in sustainable natural resource development. Nature Human Behaviour 3, 542 (2019).

Noorollahi, Y., Ghasemi, G., Kowsary, F., Roumi, S. & Jalilinasrabady, S. Modelling of heat supply for natural gas pressure reduction station using geothermal energy. International Journal of Sustainable Energy 38, 773-793 (2019).

Seyedrahimi-Niaraq, F., Ardejani, F. D., Noorollahi, Y., Porkhial, S., Itoi, R. & Jalili Nasrabadi, S. A three-dimensional numerical model to simulate Iranian NW Sabalan geothermal system. Geothermics 77, 42-61 (2019).

2018



Ashat, A., Saptadji, N. M., Prabata, W., Pratama, H. B. & Itoi, R. Grid block remodeling of Ciwidey-Patuha geothermal numerical simulation. Proceedings of Grand Renewable Energy (2018).

Ayadi, R., Trabelsi, R., Zouari, K., Saibi, H., Itoi, R. & Khanfir, H. Hydrogeological and hydrochemical investigation of groundwater using environmental isotopes (18O, 2H, 3H, 14C) and chemical tracers: a case study of the intermediate aquifer, Sfax, southeastern Tunisia. Hydrogeology Journal 26, 983-1007 (2018).

Farabi-Asl, H., Chapman, A., Itaoka, K., Jalilinasrabady, S. & Mohammadzadeh Bina, S. CO2 Emission Reduction of Ground Source Heat Pump System in Cold Climate of Japan. Proceedings of Grand Renewable Energy (2018).

Fukuda, D., Kuwano, T. & Itoi, R. Estimation of the steam fraction of injected water at the Matsukawa vapor-dominated geothermal field using two-component, two-phase tracers. Geothermics 71, 167-177 (2018).

Mohammadzadeh Bina, S., Jalilinasrabady, S. & Fujii, H. Exergoeconomic analysis and optimization of single and double flash cycles for Sabalan geothermal power plant. Geothermics 72, 74-82 (2018).

Mohammadzadeh Bina, S., Jalilinasrabady, S., Fujii, H. & Farabi-Asl, H. A comprehensive approach for wind power plant potential assessment, application to northwestern Iran. Energy 164, 344-358 (2018).

Mohammadzadeh Bina, S., Jalilinasrabady, S., Fujii, H. & Pambudi, N. A. Classification of geothermal resources in Indonesia by applying exergy concept. Renewable and Sustainable Energy Reviews 93, 499-506 (2018).

Pambudi, N. A., Itoi, R., Jalilinasrabady, S. & G?rt?rk, M. Sustainability of geothermal power plant combined with thermodynamic and silica scaling model. Geothermics 71, 108-117 (2018).

ŽR‘º Œc—C, Ž…ˆä —´ˆê, “c’† rº, Šâè —²ˆê (Yamamura, K., Itoi, R., Tanaka, T. & Iwasaki, R.). ’n”MBˆä“à”ñ’èí‹C‰t“ñ‘Š—¬“®ƒVƒ~ƒ…ƒŒ[ƒVƒ‡ƒ“ƒvƒƒOƒ‰ƒ€‚ÌŠJ”­‚Æ•sˆÀ’è—¬“®Œ»Û‚̐”’l‰ðÍ (Development of Simulation Code of Unsteady State Steam-Water Two-Phase Flow in Geothermal Wellbores and Numerical Analysis of Unstable Discharge Phenomenon). “ú–{’n”MŠw‰ïŽ (Journal of the Geothermal Research Society of Japan) 40(1), 17-31 (2018).

2017



óˆä Š°–¾, Ž…ˆä —´ˆê, “¡ˆä Œõ (Asai, H., Itoi, R. & Fujii, H.). Bˆä“à‚Å‚Ì’…‚â—g…‚𔺂¤’n’†”MŒðŠ·ƒVƒXƒeƒ€‚ÉŠÖ‚·‚鐔’lƒVƒ~ƒ…ƒŒ[ƒVƒ‡ƒ“ (Numerical Simulation of Ground Heat Exchange System with Water Injection or Pumping). “ú–{’n”MŠw‰ïŽ (Journal of the Geothermal Research Society of Japan) 39, 39-48 (2017).

Khasani, Jalilinasrabady, S., Fujii, H. & Itoi, R. Numerical study on the effects of wellhead restriction modes on the transient behaviors of a geothermal well deliverability applicable for short period of measurement. Geothermics 69, 34-44 (2017).

Khasani, Jalilinasrabady, S., Tanaka, T., Fujii, H. & Itoi, R. The study on transient behaviors of two-phase flow in a geothermal production well for a short period of continuous measurement. Experimental Thermal and Fluid Science 84, 10-17 (2017).

Mohammadzadeh Bina, S., Jalilinasrabady, S. & Fujii, H. Thermo-economic evaluation of various bottoming ORCs for geothermal power plant, determination of optimum cycle for Sabalan power plant exhaust. Geothermics 70, 181-191 (2017).

Mohammadzadeh Bina, S., Jalilinasrabady, S. & Fujii, H. Thermo-economic evaluation and optimization of a regenerative orc cycle utilizing geothermal energy. Geothermal Resources Council Transactions 41 (2017).

Mohammadzadeh Bina, S., Jalilinasrabady, S. & Fujii, H. Energy, economic and environmental (3E) aspects of internal heat exchanger for ORC geothermal power plants. Energy 140, 1096-1106 (2017).

Noorollahi, T., Itoi, R., Yousefi, H., Mohammadi, M. & Farhadi, A. Modeling for diversifying electricity supply by maximizing renewable energy use in Ebino city southern Japan. Sustainable Cities and Society 34, 371-384 (2017).

ûüŽR ƒˆê, “c’† rº, Ž…ˆä —´ˆê (Takayama, J., Tanaka, T. & Itoi, R.). ƒgƒŒ[ƒT[ŽŽŒ±‚É‚æ‚é‘å–¶’n‹æ’n”M’™—¯‘w‚̐…—\‘¢“Á«•]‰¿ (Evaluation of hydrological feature of reservoir in the Ogiri geothermal field by tracer test). “ú–{’n”MŠw‰ïŽ (Journal of the Geothermal Research Society of Japan) 39, 129-140 (2017).

2016



Ayadi, R., Zouari, K., Saibi, H., Trabelsi, R. Khanfir, H. & Itoi, R. Determination of the origins and recharge rates of the Sfax aquifer system (southeastern Tunisia) using isotope tracers. Environmental Earth Sciences 75, 636 (2016).

“¡ˆä Œõ, ¬•ì —mK, ƒtƒ@ƒ‰ƒr ƒnƒfƒB, ƒWƒƒƒŠƒŠ ƒiƒXƒ‰ƒoƒfƒB ƒTƒC[ƒh (Fujii, H., Kosukegawa, H., Farabi, H. & Jalilinasrabady, S.). ƒT[ƒ}ƒ‹ƒŒƒXƒ|ƒ“ƒXŽŽŒ±‚Ì”ñ[“UŒ^”MŒðŠ·ˆä‚Ö‚Ì“K—p‚ÉŠÖ‚·‚éŽÀŒ±“IŒŸ“¢ (Experimental study on the applicability of ungrouted ground heat exchangers on thermal response tests). “ú–{’n”MŠw‰ïŽ (Journal of the Geothermal Research Society of Japan) 38, 43-51 (2016).

Jalilinasrabady, S., Itoi, R., Uchihori, N. & Okamura, Y. Energy and Exergy Analysis of Geothermal Steam Binary Power Generation. Geothermal Resources Council Transactions 40 (2016).

Mohammadzadeh Bina, S., Jalilinasrabady, S. & Fujii, H. Exergetic sensitivity analysis of orc geothermal power plant considering ambient temperature. Geothermal Resources Council Transactions 40 (2016).

2015



Masahiro TAKAKI, Ryuichi ITOI Toshiaki TANAKA Laboratory experiment of tracer test in the two-dimensional heterogeneous porous medium Stanford Geothermal Workshop 2015 Proceedings, Vol. 40, pp. 289-296, January 2015

Christi Fina LINGKAN, Ryuichi ITOI, Toshiaki TANAKA, Jatmiko Prio ATMOJO Characterization of Fluid Flow System between Injection and Production Wells by Tritium Tracer Test Analysis Proc. Stanford Geothermal Workshop 2015, Vol. 40, pp. 240-248, January 2015

Yohei TATEISHI, Ryuichi ITOI, Toshiaki TANAKA, Junichi TAKAYAMA Development of the Natural-State Model of the Geothermal Reservoir at Ogiri, JAPAN using iTOUGH2 Proc. Stanford Geothermal Workshop 2015, Vol. 40, pp. 72-79, January 2015

Nugroho Agung PAMBUDI, Ryuichi ITOI, Saeid JALILINASRABADY, Khasani Performance improvement of a single flash geothermal power plant in Dieng, Indonesia, upon conversion to a double-flash system using thermodynamic analysis Renewable Energy, Vol.80, pp.424-431, March 2015

Nugroho Agung PAMBUDI, Ryuichi ITOI, Rie YAMASHIRO, Boy Yoseph CSS, Loren TUSARA, Saeid JALILINASRABADY, Khasani The behavior of silica in geothermal brine from Dieng geothermal power plant, Indonesia Geothermics, Vol.54, pp.109-114, March 2015

Agung HARIJOKO, Kinanti HAPSARI, Rissa PRADESKI, Yunarto Tri WIBOWO, Ryuichi ITOI The Sulfide Minerals Deposit in the Geothermal Pipes of Dieng Geothermal Field, Indonesia Proc. World Geothermal Congress 2015, April 2015

Nugroho Agung PAMBUDI, Ryuichi ITOI, Saeid Jalilinasrabady, Puji SIRAIT, Khasani Performance Improvement of Single-Flash Geothermal Power Plant Applying Three cases Development Scenario Using Thermodynamic Methods ,Proc. World Geothermal Congress 2015, April 2015

Tomohiro YAMASHITA, Ryuichi ITOI, Toshiaki Tanaka, Masahiro TAKAKI Effects of Feed Point Configuration of Wells on Tracer Material Movement in Vertical Two Dimensional Porous Media ,Proc. World Geothermal Congress 2015, CD-ROM, April 2015

Shunichi HIRAYAMA, Ryuichi ITOI, Toshiaki Tanaka, Junichi TAKAYAMA Reservoir Simulation for Reinjected Water Return in Produced Fluid of Wells at Ogiri Geothermal Field, Japan Proc. World Geothermal Congress 2015, CD-ROM, April 2015

‚–؏«Œõ, “c’†rº, Ž…ˆä—´ˆê, ŽR‰º’m—m, ‚’¼“ñŽŸŒ³‘½EŽ¿‘w‚ð—p‚¢‚½ƒgƒŒ[ƒT[ŽŽŒ±‚É‚æ‚é’™—¯‘w“à‚ÌŠÒŒ³—¬‘Ì‚Ì‹““®‚ÉŠÖ‚·‚éŽÀŒ±“IŒ¤‹†, “ú–{’n”MŠw‰ïŽ, ‘æ37Šª, ‘æ3†(2015) 75`83•Å

Tusara Loren Montefalcon, Ryuichi ITOI, Rie YAMASHIRO, Daisuke FUKUDA, Yoshitaka KAWAHARA, Effects of Suspended Material and Solution pH on Solid Deposition in Porous Media Journal of Geothermal Research Society Japan,37,4,143-152, September 2015

Hiroaki ASAI, Ryuichi ITOI, Hikari FUJII Numerical Modeling of Heat Exchange Well with Water Injection and Pumping International Symposium on Earth Science and Technology 2015, pp. 394-397, December 2015

Toshihiro NAKAMURA, Toshiaki TANAKA, Ryuichi ITOI, Masato WATANABE, Daisuke FUKUDA, Kazuto MATSUMOTO Estimation of Hydrological Structure in the Kakkonda Geothermal Field using Tracer Test Results International Symposium on Earth Science and Technology 2015, pp. 388-393, December 2015

2014



Boy Yoseph CSS SYAH ALAM, Ryuichi ITOI, Sachihiro TAGUCHI, and Rie YAMASHIRO Hydrogeochemical Characterization and the Origin of Hot Springs in the Cidanau Geothermal Field, West Java, Indonesia Proceedings of Stanford Geothermal Workshop 2014, pp.733-740, February 2014

Loren TUSARA, Ryuichi ITOI, Daisuke FUKUDA, and Yoshitaka KAWAHARA Change in Permeability of Porous Medium in Silica Scaling Experiment Under Different pH and Suspended Particle Concentration Proceedings of Stanford Geothermal Workshop 2014, pp.797-802, February 2014

Haruhiro INAGAKI, Ryuichi ITOI, Naoto KUMAGAI, Takaichi IWASAKI Numerical Simulation on Fluctuation in Wellhead Pressure of Geothermal Well Proceedings of Stanford Geothermal Workshop 2014, pp.291-299, February 2014

Yohei INOUE, Ryuichi ITOI, Naokatsu CHOU, Hiroaki OKUBO, Hikari FUJII Enhancement of Heat Exchange Capacity of Ground Heat Exchangers by Injecting Water Into Wells Proceedings of Stanford Geothermal Workshop 2014, pp.1042-1050, February 2014

Nugroho Agung PAMBUDI, Ryuichi ITOI, Saeid JALILINASRABADY, Khasani JAELANI Exergy analysis and optimization of Dieng single-flash geothermal power plant Energy Conversion and Management, Vol. 78, pp. 405-411, February 2014

Loren TUSARA, Ryuichi ITOI Characterization of solid deposits formed in geothermal surface facilities Evergreen Journal, Vol. 1, Issue 1, pp. 6-13, March 2014

Majid Kiavarz MOGHADDAM, Farhad SAMADZADEGAN, Younes Noorollahi, MOHAMMAD Ali SHARIFI, Ryuichi ITOI Spatial analysis and multi-criteria decision making for regional-scale geothermal favorability map Geothermics, Vol.50, pp.189-201, April 2014

Masahiro TAKAKI, Tomohiro YAMASHITA, Toshiaki TANAKA, Ryuichi ITOI Laboratory experiment of tracer test using two kind of dyes in the vertical two-dimensional porous media. Grand Renewable Energy 2014 Proceedings, CD, O-Ge-10-3, July 2014

Aiko HARADA, Ryuichi ITOI, Boy Yoseph CSS SYAH ALAM Numerical Simulation of Ground Water, heat and Stable Isotope in Cidanau Geothermal Area, Indonesia Geothermal Resources Council Transactions, Vol.38, pp 583-588, October 2014

Junichi TAKAYAMA, Ryuichi ITOI, Seiya MORITA Eighteen years History of Reservoir Development in the Ogiri Geothermal Field Japan Geothermal Resources Council, Vol.38, pp 6-13, October 2014

Yohei TATEISHI1, Ryuichi ITOI, Toshiaki TANAKA, Junichi TAKAYAMA Numerical simulation of evolution of steam-water two-phase zone in a fractured geothermal reservoir by considering capillary pressure effects 36th New Zealand Geothermal Workshop 2014, November 2014

Yuki HATTA, Toshiaki TANAKA, Ryuichi ITOI Modeling of Steam-Water Two-Phase Flow in Geothermal Wells Using Particle Method International Symposium on Earth Science and Technology 2014, pp.291-292, December 2014

Rahma AYADI, Kamel ZOUARI, Rim TRABELSI, Ryuichi ITOI, Hakim SAIBI Hydrochemical Evaluation of Groundwaters from the Shallow Aquifer System of Sfax, Southeastern Tunisia International Symposium on Earth Science and Technology 2014, pp. 303-311, December 2014

Ali ASHAT, Ahmad YANI, Ryuichi ITOI The Natural Sate Numerical Model of Kamojang Geothermal Reservoir, West Java, Indonesia International Symposium on Earth Science and Technology 2014, pp.128-133, December 2014

Yohei TATEISHI1, Ryuichi ITOI, Toshiaki TANAKA Natural-State Simulation of Geothermal Reservoir at Ogiri, Japan, Using a Numerical Model Incorporated with Stratigraphic Information International Symposium on Earth Science and Technology 2014, pp.134-138, December 2014

Aiko HARADA, Ryuichi ITOI, Boy Yoseph CSS SYAH ALAM Development of a Numerical Model for Groundwater Flow, Heat Transportation and Hydrogen Stable Isotope in Cidanau Geothermal Area International Symposium on Earth Science and Technology 2014, pp.149-154, December 2014

Christi Fina LINGKAN, Ryuichi ITOI, Jatmiko Prio ATMOJO Interpretation of Tritium Tracer Test Data with One Dimensional Linear Flow Model International Symposium on Earth Science and Technology 2014, pp.162-166, December 2014

Rahma AYADI, Rim TRABELSI, Kamel ZOUARI, Ryuichi ITOI, Hakim SAIBI Determination of Recharge Sources of Sfax Aquifer System (Southeastern Tunisia) Using Environmental Isotope Tracers International Symposium on Earth Science and Technology 2014, pp. 167-174, December 2014

2013



Yohei INOUE, Ryuichi ITOI, Naokatsu CHOU, Hiroaki Okubo, Hikari FUJII, Effect of Injecting Water into the Well on Heat Exchange Rates in Vertical Ground Heat Exchangers, Proceedings of International Symposium on Earth Science and Technology 2013, pp.262-267, December 2013

Nugroho Agung PAMBUDI, Ryuichi ITOI, Saeid JALILINASRABADY, Khasani JAELANI, Second law assessment of proposed combined binary power generation in Dieng Geothermal power plant, International Symposium on Earth Science and Technology 2013, pp. 252-261, December 2013

Loren TUSARA, Ryuichi ITOI, Yoshitaka KAWAHARA, Daisuke FUKUDA,Osamu KATO, Codeposition of silica with suspended particles in porous media, International Symposium on Earth Science and Technology 2013, pp.77-82, December 2013

Saeid JALILINASRABADY, Ryuichi ITOI, Classification of geothermal energy resources in Japan applying exergy concept, International Journal of Energy Research, Vol.37, Issue 14, pp.1842-1850, November 2013

‹î’ë‹`l, “¡ˆäŒõ, ‘OŒ´—²L, ’·’¼Ÿ, ‚’¼Œ^’n’†”MŒðŠ·ˆä‚Ö‚Ì’…‚ª”MŒðŠ·”\—Í‚É—^‚¦‚é‰e‹¿‚ÉŠÖ‚µ‚ẴtƒB[ƒ‹ƒhŽŽŒ±‚É‚æ‚錟“¢, “ú–{’n”MŠw‰ïŽ, ‘æ35Šª, ‘æ4†(2013), 137-148•Å

•Ÿ“c‘å•ã, ŒK–싱, Ž…ˆä—´ˆê, ¼ìö‹C‘ì‰zŒ^’n”M’™—¯‘w‚É‚¨‚¯‚éƒAƒ‹ƒR[ƒ‹‚ð—p‚¢‚½“ñ‘ŠƒgƒŒ[ƒTŽŽŒ±:¶ŽYˆä‚Ì’…‰ž“š‚Ì•]‰¿‚Ɛ¶ŽYŠ±Â‚Ì—\‘ª, “ú–{’n”MŠw‰ïŽ, ‘æ35ŠªA‘æ2†(2013), 69`81•Å

Takeshi HINO, Ryuichi ITOI, Toshiaki TANAKA, Nugroho Agung PAMBUDI, Khasani JAELANI, Natural state model of Dieng geothermal field, Central Java, Indonesia, Geothermal Resources Council Transactions, Vol.37, pp.831-836, October 2013

Ryuichi ITOI, Yasunari KATAYAMA, Toshiaki TANAKA, Naoto KUMGAI, Takaichi IWASAKI, Numerical Simulation of Instability of Geothermal Production Well, Geothermal Resources Council Transactions, Vol.37, pp.837-842, October 2013

Yohei TATEISHI, Ryuichi ITOI, Toshiaki TANAKA, Junichi TAKAYAMA, Naoto HIRAGA, Numerical simulation of devolution and evolution of steam-water two-phase zone in a fractured geothermal reservoir at Ogiri, JAPAN, Geothermal Resources Council Transactions, Vol.37, pp.915-920, October 2013

Masahiro TAKAKI, Ryuichi ITOI, Toshiaki TANAKA, Takumi MARUO, Laboratory experiment of tracer test in the vertical two-dimensional porous media with newly developed tracer sensors, Geothermal Resources Council Transactions, Vol.37, pp.337-340, October 2013

Saeid JALILINASRABADY, Ryuichi ITOI, Yuji OHYA, Hybrid geothermal and wind power generation, Geothermal Resources Council Transactions, Vol.37, pp.727-732, October 2013

Fujii, H., Yamasaki, S., Maehara, T., Ishikami, T., Chou, N.,Numerical simulation and sensitivity study of double-layer Slinky-coil horizontal ground heat exchangers,Geothermics,1,2013.08.

Saeid JALILINASRABADY, Halldor PALSSON, Gudrun SAEVARSDOTTIR, Ryuichi ITOI, Pall VALDIMARSSON, Experimental and CFD simulation of heat efficiency improvement in geothermal spas, Energy, Vol.56, pp.124-134, July 2013

Hikari FUJII, Shohei YAMASAKI, Takahiro MAEHARA, Takashi ISHIKAMI, Naokatsu CHOU, Numerical simulation and sensitivity study of double-layer Slinky-coil horizontal ground heat exchangers, Geothermics, Vol.47, pp.61-68, July 2013

Fujii, H., Yamasaki, S., Maehara, T.,Numerical modeling of Slinky-coil horizontal heat exchangers considering snow coverage effects,Proc. Stanford Geothermal Workshop 2013,1378-1383,2013.02.

Masayo KAKUMOTO, Jun YONEDA, Kuniyuki MIYAZAKI, Norio TENMA, Kazuo AOKI, Ryuichi ITOI, Basic Study on the Frictional Strength between the Casing and Cement in a Methane Hydrate Production well - Basic Study of Well Stability for Methane Hydrate Development -, Journal of MMIJ, Vol.129, No.4, pp.116-123, January 2013

2012



“¡ˆä ŒõE‹î’ë‹`lEˆä‰ª¹ˆê˜YE“n•”“ÖŽjEˆäã—z•½,‚’¼Œ^’n’†”MŒðŠ·ˆä‚É‚¨‚¯‚é’n‰º…‚̃NƒƒXƒtƒ[‚ª”MŒðŠ·—Ê‚É‹y‚Ú‚·‰e‹¿‚Ì•]‰¿,“ú–{’n”MŠw‰ïŽ,34,4,2012.10.

Fujii, H., Yamasaki, S., Maehara,Numerical modeling and sensitivity study of Slinky-coil ground heat exchangers,Proceedings of FEFLOW User Conference,2012.09.

Saeid Jalilinasrabady, Ryuichi Itoi, Pall Valdimarsson, Gudrun Saevarsdottir, Hikari Fujii,Flash cycle optimization of Sabalan geothermal power plant employing exergy concept ,Geothermics,43,75-82,2011.06.

Nguyen Kim Phuong, Agung Harijoko, Ryuichi ITOI, Yamashiro Unoki,Water geochemistry and soil gas survey at Ungaran geothermal field, central Java, Indonesia,Journal of Volcanology and Geothermal Research,229-230,23-33,2012.05.

Fujii, H., Maehara, T., Komaniwa, Y., Chou, N., Ishikami, T.,Field Tests and Numerical Modeling of Double-layered Straight Horizontal Ground Heat exchangers ,Proceedings of InnoStock 2012,2012.05.

Boy Yoseph CSS Syah ALAM, Ryuichi ITOI, HENDARMAWAN,Geological Setting and Groundwater Characteristics for Identifying Recharge Area in Mt. Karang, West Java , Indonesia,Proc. International Symposium on Earth Science and Technology 2011,2011.12.

Seiji YAMASHITA, Ryuichi ITOI and Toshiaki TANAKA,A Three Dimensional Numerical Modeling of the Ogiri Geothermal System using TOUGH2 and iTOUGH2,Proc. International Symposium on Earth Science and Technology 2011,2011.12.

Moriaki IWASAKI, Ryuichi ITOI and Toshiaki TANAKA,Analysis of Tracer Flow in a Two-dimensional Porous Media,Proc. International Symposium on Earth Science and Technology 2011,2011.12.

Loren TUSARA, Ryuichi ITOI, Yoshitaka KAWAHARA, Daisuke FUKUDA,Numerical Simulation of Silica Deposition in a Geothermal Pipeline,Proc. International Symposium on Earth Science and Technology 2011,2011.12.

Daisuke Fukuda, Masahiro Sarudate, Ryuichi Itoi,Development and Application of Two-phase Tracer Testing at the Matsukawa Vapor-dominated Geothermal Reservoir,Proc. International Symposium on Earth Science and Technology 2011,2011.12.

“¡ˆä ŒõE‹î’ë‹`lEÎã FE’· ’¼ŸE‘哇˜a•vE’JŒû‘Žq,2‘w\‘¢‚𓱓ü‚µ‚½’¼ŠÇŽ®‹y‚ÑSlinky-coilŽ®…•½Œ^’n’†”MŒðŠ·Ší‚̃tƒB[ƒ‹ƒhŽŽŒ±,“ú–{’n”MŠw‰ïŽ,34,1,37-46,2012.01

Fujii, H., Nishi, K., Komaniwa, Y., Chou, N.,Numerical modeling of Slinky-coil horizontal ground heat exchangers,Geothermics,40,2011.12.

Fujii, H., Komaniwa, Y., Nomoto, T., Chou, N.,Reduction of thermal resistance of ground heat exchangers using large grain size materials,Geothermal Resources Council Transactions,35,2011.10.

“¡ˆä ŒõC–ì–{‘ì–çC‘哇˜a•vCÎã FC’JŒû‘ŽqCŽRŒû‰ë“o,‚’¼Œ^’n’†”MŒðŠ·ˆä‚É‚¨‚¯‚é’n‰º…—g…‚É‚æ‚é”MŒðŠ·—Ê‘i‚Ì•]‰¿,“ú–{’n”MŠw‰ïŽ,33,2,67-76,2011.05.

“¡ˆä@ŒõC‹î’ë‹`lCŽ…ˆä—´ˆêC–ìŒûr˜YC–ì–{‘ì–çC¬•ì—mK,Slinky-coilŽ®…•½Œ^’n’†”MŒðŠ·Ší‚̃tƒB[ƒ‹ƒhŽŽŒ±,“ú–{’n”MŠw‰ïŽ,32,4,219-228,2010.10.

…‰iGŽ÷C•–ØŒhŒåC“c’†rº,F-Kƒ}ƒCƒOƒŒ[ƒVƒ‡ƒ“‚ð—p‚¢‚½’n’†ƒŒ[ƒ_‚ÌŽOŽŸŒ³‰ÂŽ‹‰»,•¶‰»à‚Æ’T¸,2010.05.

…‰iGŽ÷C“c’†rºC‹“‡Œb•ãC‹{–{ˆê•vC’Ò“c~ˆê˜Y,‹ãB‘åŠwˆÉ“sƒLƒƒƒ“ƒpƒX‚Ì‘O•ûŒã‰~•­’T¸,•¶‰»à‚Æ’T¸,2010.05.

Toshiaki Tanaka , Ryuichi Itoi ,Development of Numerical Modeling Environment for TOUGH2 Simulator on the Basis of Graphical User Interface (GUI),World Geothermal Congress 2010,CD,2010.04.

Ryuichi Itoi, Yurie Kumamoto, Toshiaki Tanaka ,unichi Takayama,History Matching Simulation of the Ogiri Geothermal Field, Japan,World Geothermal Congress 2010,25-29,2010.04.

Fujii, H., Okubo, H., Cho, N., and Ohyama, K.,Field tests of horizontal ground heat exchangers,Proc. WGC2010,2010.04.

Noorollahi, Y., Itoi, R., Fujii, H., Tanaka, T.,Production Capacity Estimation by Reservoir Simulation of Northwest Sabalan Geothermal Field, Iran,Proc. WGC2010,2010.04.

Jalilinasrabady, S., Itoi, R., Fujii, H., Tanaka, T.,Energy and Exergy Analysis of Sabalan Geothermal Power Plant, Iran,Proc. WGC2010,2010.04.

Jalilinasrabady, S., Itoi, R., Fujii, H., Tanaka, T.,Cascade Uses of Geothermal Energy in Sabalan - Iran,Proc. WGC2010,2010.04.

“¡ˆäŒõ,‹î’ë‹`l,ŽRŒû‰ë“o,’· ’¼Ÿ,”ñ[“UUŽšŠÇŒ^”MŒðŠ·ˆä‚É‚¨‚¯‚éƒT[ƒ}ƒ‹ƒŒƒXƒ|ƒ“ƒXŽŽŒ±‰ðÍ,“ú–{’n”MŠw‰ïŽ,2010.01.

Fujii, H., Okubo, H., Nishi, K., Itoi, R. Ohyama, K. and Shibata, K.,An improved thermal response test for U-tube ground heat exchanger based on optical fiber thermometers,Geothermics,2009.12.

Hossein Yousefi, Younes Noorollahi, Sachio Ehara, Ryuichi Itoi, Amin Yousefi, Yasuhiro Fujimitsu, Jun Nishijima, Kyuro Sasaki,Developing the geothermal resources map of Iran,Geothermics,2009.12.

Development of Numerical Model of Takigami Geothermal Reservoir, Oita, Japan, incorporated with wellbore flow simulation Shoichiro HOZUMI, Ryuichi ITOI, Toshiaki TANAKA, Hiroki GOTOH Proceedings of International Symposium on Earth Science and Technology 2009, pp.573-578, December 2009

History Matching of Production Performance in a Water-soluble Natural Gas Field, Japan Yoshitake KATO, Hikari FUJII, Ryuichi ITOI, Shinichi Mitsuda Proceedings of International Symposium on Earth Science and Technology 2009, pp.129-134, December 2009

Comparison of Geothermal and Fuel-fired Heating Systems in Sabalan, Iran Saeid JALILINASRABADY, Ryuichi ITOI, Hikari FUJII, and Toshiaki TANAKA Proceedings of International Symposium on Earth Science and Technology 2009, pp.309-314, December 2009

Possibility for Cost Reduction of Geothermal Heat Pump System by Improving Heat Transfer Characteristics of Buildings Yoshihito KOMANIWA, Hikari FUJII, Naokatsu CHOU, Hiroaki OKUBO Proceedings of International Symposium on Earth Science and Technology 2009, pp.321-326, December 2009

Numerical Modeling of Horizontal Ground Heat Exchangers Keita NISHI, Hikari FUJII, Hiroaki OKUBO, Takafumi KARIYA, Naokatsu CHOU Proceedings of International Symposium on Earth Science and Technology 2009, pp.327-332, December 2009

Exploitation Modeling and Reservoir Performance Prediction for the Ogiri Geothermal System in Japan Yurie KUMAMOTO, Ryuichi ITOI, Toshiaki TANAKA and Junichi TAKAYAMA Proceedings of International Symposium on Earth Science and Technology 2009, pp.315-320, December 2009

An Improved Thermal Response Test for U-tube Ground Heat Exchanger Based on Optical Fiber Thermometers Hikari FUJII, Hiroaki OKUBO, Keita NISHI, Ryuichi ITOI, Kunio OHYAMA and Kazuo SHIBATA Geothermics Vol.38, No.3, pp.399-406, December 2009

History Matching and Prediction Simulations of Ogiri Geothermal Field, Kyushu, Japan Yurie KUMAMOTO, Ryuichi ITOI, Toshiaki TANAKA and Junichi TAKAYAMA Proceedings 31st New Zealand Geothermal Workshop, Online, November 2009

Optimization of the Sabalan Geothermal Power Plant, Iran, using Exergy Concept Saeid JALILINASRABADY, Ryuichi ITOI, Hikari FUJII, Toshiaki TANAKA Proceedings 31st New Zealand Geothermal Workshop, Online, November 2009

Magmatic Fluid Input to the Kuju-Iwoyama Hydrothermal System Prior to the 1995 Eruption of the Kuju Volcano(Kyushu, Japan) Itsuro KITA, Tatsuji KAI, Ryuichi ITOI, Makiko ISHIDA, Akira UEDA Geothermics, 38, 3, pp.294-302, September 2009

Application of Optical Fiber Thermometers in Thermal Response Tests for Detailed Geological Descriptions Hikari FUJII, Hiroaki OKUBO, Masaki Chono, Masakatsu SASADA, Shinji TAKASUGI, and Masayuki TAKENO Proceedings of EFFSTOCK2009, Paper No.21, June 2009

Interpretation of a Thermal Response Test Using Fiber Optic Distributed Temperature Sensing Method Shim BYOUNG OHAN, Song YOON HO, Hikari FUJII and Hiroaki OKUBO Proceedings of EFFSTOCK2009, Paper No.155, June 2009

Field Tests of Horizontal Ground Heat Exchangers Using Coil-like Tube Hiroaki OKUBO, Hikari FUJII, Ryuichi ITOI, Keita NISHI, Kunio OHYAMA and Naokatsu CHOUProceedings of 2nd International Symposium of Novel Carbon Resource Science, VI-10-VI-16, March 2009

Energy and Exergy Analysis of Single Flash Geothermal Power Plant, Sabalan, Iran Saeid JALILINASRABADY, Ryuichi ITOI, Hikari FUJII, and Toshiaki TANAKA Proceedings of 2nd International Symposium of Novel Carbon Resource Science, VI-37-VI-46, March 2009

ŽÀ–û“cƒVƒ~ƒ…ƒŒ[ƒVƒ‡ƒ“ƒ‚ƒfƒ‹ã‚ł̃jƒ…[ƒ‰ƒ‹ƒlƒbƒgƒ[ƒN‚ð—p‚¢‚½Œ´–û¶ŽYŒv‰æ‚̍œKÝŒv “¡ˆäŒõ,”’ˆäŠ°l,“yˆäŠw,{ŠLŒ\ˆê˜N Î–û‹Zp‹¦‰ïŽVol.74, No.2, pp.175-184C2009”N3ŒŽ

Analysis of Neutralization Reaction in a Geothermal Well Naoyuki AKAZAWA and Ryuichi ITOI Proceedings of Stanford Geothermal Workshop 2009, CD

Modeling and Numerical Analysis of the Two-phase Geothermal Reservoir at Ogiri, Kyushu, Japan Yurie KUMAMOTO, Ryuichi ITOI, Toshiaki TANAKA and Yukio HAZAMA Proceedings of Stanford Geothermal Workshop 2009, CD

Laboratory Experiment and Numerical Modeling of Co-axial Heat Exchanger “¯Ž²Œ^’n’†”MŒðŠ·Ší‚ÌŽº“àƒ‚ƒfƒ‹ŽÀŒ±‚¨‚æ‚ѐ”’lƒ‚ƒfƒŠƒ“ƒO Hiroaki OKUBO, Hikari FUJII and Ryuichi ITOI ‘å‹v•Û”ŽW,“¡ˆäŒõ,Ž…ˆä—´ˆê Journal of the Geothermal Research Society of Japan, Vol.31, No.1, pp.51-62, January 2009 “ú–{’n”MŠw‰ïŽVol.31, No.1, pp.51-62C2009”N1ŒŽ

Prediction of Long-term Performance of Ground Source Heat Pump in Greenhouses Hiroaki OKUBO, Hikari FUJII, Ryuichi ITOI, Masaki CHONO, Kunio OHYAMA, Chou Naokatsu and Shigeaki Narita Proceedings of International Symposium on Earth Science and Technology 2008, pp.99-106, 2008

Interpretation of Continuous Measurement of Steam and Water Flow Rates at a Production Well 2H-21, Hatchobaru Geothermal Field, Japan Khasani, Toshiaki TANAKA and Ryuichi ITOI Proceedings of the 30th New Zealand Geothermal Wokrkshop, pp.222-227, 2008

Šî‘bY‚ð—˜—p‚µ‚½’n’†”M—˜—p—â’g–[—ZáƒVƒXƒeƒ€‚̃Vƒ…ƒ~ƒŒ[ƒVƒ‡ƒ“ƒ‚ƒfƒ‹\’z‚Æ’n’†”MŒðŠ·—Ê‚ÌŒŸ“¢ ÎãFC“¡ˆäŒõCŽ…ˆä—´ˆê “ú–{’n”MŠw‰ï-ŽC‘æ30ŠªC‘æ4†Cpp.271-280C2008

Application of Ground Source Heat Pumps for Air-conditioning of Greenhouses Hikari FUJII, Kunio OHYAMA, Hiroaki OKUBO and Ryuichi ITOI Proceedings of Renewable Energy 2008, CD, 2008

Interpretation of Thermal Response Test Using Temperature Profiles in Ground Heat Exchangers Hiroaki OKUBO, Hikari FUJII and Ryuichi ITOI Proceedings of Renewable Energy 2008, CD, 2008

Numerical Modeling of Forced Heat Rejection Test Considering Groundwater Flow Effects Keita NISHI, Hikari FUJII, Takashi ISHIKAMI and Kazuhiro FUJIWARA Proceedings of Renewable Energy 2008, CD

Development of a Numerical Modeling for a Borehole Heat Exchanger System Using Long-term Modeling Data Shim BYOUNG OHAN, Hikari FUJII and Song YOON HO Proceedings of Renewable Energy 2008, CD

Numerical Modeling of the Ogiri Geothermal System, Kyushu, Japan Yurie KUMAMOTO, Ryuichi ITOI, Horne ROLAND and Yukio HAZAMA Transaction of Geothermal Resources Council, Vol.32, pp.449-458, 2008

Source and Release Mechanism of Arsenic in Aquifers of the Mekong Delta, Vietnam Nguyen KIM PHUOUNG and Ryuichi ITOI Jounel of Contaminant Hydrology 103, pp.58-69, 2008

BˆäŠÔ‚̈³—ÍŠ±Â‚ðl—¶‚µ‚½ƒvƒ‰ƒ“ƒgƒpƒ‰ƒ[ƒ^ƒ‚ƒfƒ‹‚Ì’™—¯‘wŠÇ—‚Ö‚Ì“K—p –“N–çC´“c—R”üCŽ…ˆä—´ˆêC’|“ˆMK “ú–{’n”MŠw‰ïŽC‘æ30ŠªC‘æ2†Cpp.131-144C2008

GIS Integration Model for Geothermal Exploration and Well Siting Noorollahi, Y., Itoi, R., Fujii, H. and Tanaka, T. Geothermics, Vol.34 (No.2, 107-131) (2008)

ƒƒ^ƒ“ƒnƒCƒhƒŒ[ƒg‘w‚É‚¨‚¯‚é[•”’n‹…”M‚ð—p‚¢‚½”MŽhŒƒ–@‚Ì•]‰¿ “¡ˆäŒõ,˜aè—S‰î,Ž…ˆä—´ˆê “ú–{ƒGƒlƒ‹ƒM[Šw‰ïŽ Vol.87, No.3, 199-207,2008

Evaluation of air-conditioning system with ground source heat pump in a greenhouse for agricultual use Okubo, H., Fujii, H., Itoi, R., Ohyama, K. and Narita, S. Proc. 5th Int. Workshop on Earth Science & Technology, Kyushu Univ., 263-372, 2007

Develpoment oh thermal stimulation method using deep geothermal heat source Wasaki, Y., Fujii, H. and Itoi, R. Proc. 5th Int. Workshop on Earth Science & Technology, Kyushu Univ., 255-262, 2007

Development of suitability maps for ground-coupled heat pump systems using groundwater and heat transport modeling, Fujii, H., Inatomi, T., Itoi, R. and Uchida, Y. Geothermics, Vol.36, No.5, 459-472, 2007

Interpretation of Thermal Response Tests in the Presence of Groundwater Flow, Geothermal Fujii, H., Okubo, H. and Itoi, R. Resources Council Transactions, Vol.31, 465-470, 2007

GIS Model for Geothermal Resources Exploration in Akita and Iwate Prefecture, northern Japan. Noorollahi, Y., Itoi, R., Fujii, H. and Tanaka, T. Computer & Geosciences, Vol.33, No.8, 1008-1021, 2007

Numerical modeling of the Momotombo Geothermal System, Nicaragua Porras, E., Tanaka, T., Fujii, H. and Itoi, R. Geothermics, Vol.36, No.4. 304-329, 2007

’n’†”M—˜—p—â’g–[—ZáƒVƒXƒeƒ€‚É‚¨‚¯‚鐂’¼Œ^‚tŽšŠÇ”MŒðŠ·ˆä‚̉^“]ŽÀÑ•]‰¿ ÎãF,“¡ˆäŒõ,Ž…ˆä—´ˆê “ú–{’n”MŠw‰ïŽVol.29,No.2, 91-102, 2007

GIS Model for Geothermal Resources Exploration (GM-GRE) in Sabalan Geothermal Area Northwestern Iran Noorollahi, Y., Itoi, R., Fujii, H. and Tanaka, T. Proc. 4th Int. Workshop on Earth Science & Technology, Kyushu Univ., 407-421, 2006

Gas production from methane hydrate deposites by thermal stimulation using geothermal heat source and depressurization Fujii, H., Wasaki, Y. and Ioti, R. Proc. 4th Int. Workshop on Earth Science & Technology, Kyushu Univ., 357-366, 2006

History Matching of Long-term Performance of a GeoHP system in Shirakami Mountains Ishikami, T., Fujii, H., Kinoshita, M. and Itoi, R. Proc. 4th Int. Workshop on Earth Sience & Technology, Kyushu Univ., 109-116, 2006

’}Ž‡•½–ì‚É‚¨‚¯‚鐅Ž¿CŽ_‘fE…‘fˆÀ’蓯ˆÊ‘̔䂨‚æ‚Ñ’n‰º‰·“x‚Ì•ª•z“Á« “à“c—m•½,ˆî•x’‰«,“¡ˆäŒõ “ú–{…•¶‰ÈŠw‰ïŽVol.36, No.4, 197-204, 2006

The Momotowbo Geothermal System and its Conceptual Model Porras,E.A,and R.Itoi GRC trans Vol30, 2006.9

Thermal response tests using optical fiber thermometers Fujii, H., Okubo, H., and Itoi, R. Geothermal Resources Council Transactions, Vol.30, 545-551, 2006

Experimental study on thermal resistance of vertical ground heat exchangers Okubo, H., Fujii, H. and Itoi, R. Geothermal Resources Council Transactions, Vol.30, 559-563, 2006.9

History matching and performance prediction of a geothermal heat pump system under influence of groundwater flow Taniguchi, S., Fujii, H., Itoi, R. and Ishikami, T. Geothermal Resources Council Transactions, Vol.30, 571-576, 2006.9

uÀu’n’†”M—˜—pƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€v‰·“x‰ž“šŽŽŒ±‚ÌŽÀŽ{‚ƉðÍ “¡ˆäŒõ(2006.4) “ú–{’n”MŠw‰ïŽVol.28,No.2, 245-257, 2006.4

•s‹ÏŽ¿’n‘w‚É‚¨‚¯‚éUŽšŠÇŒ^”MŒðŠ·ˆä‚̉·“x‹““®‰ðÍ “¡ˆäŒõ,‘å‹v•Û”ŽW,Ž…ˆä—´ˆê,¬•ì—mK “ú–{’n”MŠw‰ïŽVol.28,No.2, 199-210, 2006.4

ŠÏ‘ªˆä‚̏­‚È‚¢’nˆæ‚É‚¨‚¯‚éó‘w’n‰º‰·“x\‘¢‚̐„’è@|H“c•½–ì‚Ì—á| “à“c—m•½EŠÛŽR‚ ‚ä‚݁E’r“cØŽqE“¡ˆäŒõEˆÀ•FGl “ú–{…•¶‰ÈŠw‰ïŽAVol.35, No.4, 191-203, 2005.12

Energy Supply Plan Using an Abandoned Deep Well in Horonobe, Hokkaido, Japan Hiroaki OKUBO, Hikari FUJII, Jun MITSUHASHI and Yoji ISHIJIMA Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 259-266, 2005.12

Application of Gis in Exploration Management and Well Site Selection of Namafjall Geothermal Area, North Iceland Younes NOOROLLAHI Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 223-240, 2005.12

Numerical Simulation of Ground Heat Exchanger on an Abandoned Deep Well Using AUTOUGH2 Sandy Kurniawan SUHARDJA, Ryuichi ITOI and Fujii HIKARI Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ.,105-112, 2005.12

Hydrothermal System of the Ungaran Geothermal Area, Indonesia Inferred from Geochemical Nguyen Kim PHUONG, Heru HENDRAYANA, Agung HARIJOKO, Ryuichi ITOI and Rie UNOKI Study, Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ.,19-28, 2005.12

”ª’šŒ´30†ö‹Cˆä(H-30)‚Ì•¬o—Í‚Ì•Ï“®‹@\ –“N–çAâV“¡”ŽŽ÷AŽ…ˆä—´ˆêA–{ŽR’B–ç “ú–{’n”MŠw‰ïŽAVol.27,No.4,pp.321-336, 2005.10

•¡”—¬˜Hƒ‚ƒfƒ‹‚ð—p‚¢‚½Š‹ª“c’n”M’nˆæ‚É‚¨‚¯‚éƒgƒŒ[ƒT[ŽŽŒ±Œ‹‰Ê‚̉ðÍ “c’†rºEŒÃŽu^ˆêEƒ‚ƒŠ[ƒi@ƒpƒgƒŠƒVƒAEŽ…ˆä—´ˆêEŠŒ´—³Æ “ú–{’n”MŠw‰ïŽAVol.27,No.4,pp.293-305, 2005.10

•s‹ÏŽ¿’n‘w‚É‚¨‚¯‚铯Ž²Œ^”MŒðŠ·ˆä‚̉·“x‹““®‰ðÍ “¡ˆäŒõE‘å‹v•Û”ŽWE’†”ö—˜–LEŽ…ˆä—´ˆê “ú–{’n”MŠw‰ïŽAVol.27,No.3, 223-232, 2005.7

Optimum design of large-scale ground-coupled heat pump systems using groundwater and heat transport modeling Fujii, H., Itoi, R., Fujii, J. and Uchida, Y. Geothermics, Vol.35, pp.347-364, 2005.6

Sustainable Management of Rose Growing in Greenhouse Heated by Geothermal Water at Kuju, Japan, Itoi, R., Watanabe, M. and Tokimatsu, H Proc. World Geothermal Congress 2005, 2005.4

Development of Energy Supply Systems Using Abandoned Deep Wells Fujii, H., Akibayashi, S. and Itoi, R. Proc. World Geothermal Congress 2005, CD 1-5, 2005.4

Effects of Volcanic Gases on Rain Water and Soil Chemistries at Kuju, Japan Unoki, R. and Itoi, R. Proc. World Geothermal Congress 2005, CD1-5, 2005.4

Numerical Analysis of Transient Behaviors of Geothermal Well Deliverability Khasani, Itoi, R., and Fujii, H. Proc. World Geothermal Congress 2005, CD 1-6, 2005.4

Numerical Modeling of the Momotombo Geothermal Reservoir, Nicaragua Porras, E., Tanaka, T. Fujii, H. and Itoi, R. Proc. World Geothermal Congress 2005, CD 1-16, 2005.4

Analysis and interpretation of Naphthalene Disulfonate Tracer Tests at the Mahanagdong geothermal field, Philippines Molina, P. O., Tanaka, T., Itoi, R., Siega, F.L. and Ogena M.S. Proc. World Geothermal Congress 2005, 2005.4

Predictions of reservoir performances for different scenarios at Momotombo geothermal field, Nicaragua Porras, E., Itoi, R., Fujii, H. and Tanaka, T. Proc. 26th Annual PNOC-EDC Conference

ƒ}ƒ‹ƒ`ƒtƒB[ƒh‚ɑΉž‚µ‚½BˆäƒVƒ~ƒ…ƒŒ[ƒ^MULFEWS‚ÌŠJ”­‚Æ”ª’šŒ´ƒtƒB[ƒ‹ƒhƒf[ƒ^‰ðÍ‚Ö‚Ì“K—p “¼“c—msEŽ…ˆä—´ˆêEà_“c—YŽjEçŽè—²“¿ “ú–{’n”MŠw‰ïŽA27A1A11-26, 2005.1

“c’†@rºEâŒû@—Ž}E•Ÿ‰ª@Wˆê˜YE“¡ˆä@ŒõE‹g“c@“N—Y(2005),’n’†”M—˜—pƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€‚Ì‚½‚ß‚Ì’n‰º…“d‹C’T¸,•¨—’T¸Šw‰ïŠwpu‰‰‰ïu‰‰˜_•¶W,113,307-310

Effects of CO2 Gas in Geothermal Water on Well Characteristics Khasani, Miyazaki, E. and Itoi, R. Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 105-112, 2004.12

Three Dimensional Reservoir Simulation of the Momotonbo Geothermal Field, Nicaragua Porras, E., Itoi, R., Fujii, H. and Tanaka, T. Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 143-150, 2004.12

–k•Ä‚É‚¨‚¯‚é”ñÝ—ˆŒ^“V‘RƒKƒX‚̍œK‹Ÿ‹‹Š„‡‚Ì—\‘ª Ž›è‘¾“ñ˜YE“¡ˆäŒõ “ú–{ƒGƒlƒ‹ƒM[Šw‰ïŽA83A916-923, 2004.11

Numerical Simulation of Large-Scale GCHP Systems in the Presence of Groundwater Flow Fujii, H., Itoi, R. Fujii, J. Uchida, Y. and Ishikami, T. Geothermal Resources Council Transactions, 28, 79-84, 2004.9

Improvements on Analytical Modeling for Vertical U-tube Ground Heat Exchangers Fujii, H., Itoi, R. and Ishikami, T. Geothermal Resources Council Transactions, 28, 73-77, 2004.9

Analysis and Interpretation of NDS Tracer Test Results at the Mahanagdong Geothermal Field, Philippines Molina, P., Tanaka, T., Itoi, R. Siega, F. and Ogena, M. Proc. of 25th Annual PNOC-EDC Geothermal Conference, 171-179, 2004.5

‘å’nŒ‹‡ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€‚ð—p‚¢‚½—ZáƒVƒXƒeƒ€‚̐݌v‚ÉŠÖ‚·‚éŽÀŒ±“I‚¨‚æ‚ѐ”’l“IŒŸ“¢ “¡ˆäŒõEÎãFE‘哇˜a•v¥‹àŽq‘× “ú–{’n”MŠw‰ïŽA26(1)A39-57, 2004.1

Characterization of geothermal fluid flows at Sumikawa geothermal area, Japan, using two types of tracers and an improved multi-path model KUMAGAI Naoto E TANAKA Toshiaki E KITAO Koji Geothermics,33,3,257-275,PergamonE Elsevier Ltd, 2004

—¬‘Ì—¬“®“dˆÊ–@‚É‚æ‚é‘åÀ’n”M’n‘Ñ‚Ì’™—¯‘wƒ‚ƒjƒ^ƒŠƒ“ƒO …‰i@GŽ÷EÂ–ì@“N—YE“c’†@rºE²X–؁@ƒˆêE‹“‡@Œb•ã “ú–{’n”MŠw‰ïŽ,26,3,251-271,2004

•¡”—¬˜Hƒ‚ƒfƒ‹‚ð—p‚¢‚½ƒgƒŒ[ƒT[‰ðÍ‚É‚¨‚¯‚é‹T—ô‚̍L‚ª‚è‚̉e‹¿ ‹g“c‘ñE“c’†rºEŽ…ˆä—´ˆê ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA12†A49-55, 2003.12

A Numerical Study on the Effects of Initial Water Saturation of a Geothermal Reservoir on Well Characteristics KHASANI E ITOI Ryuichi E TANAKA Toshiaki E FUKUDA Michihiro Memoirs of the Faculty of Engineering, Kyushu University,64,1,1-15,Faculty of Engineering, Kyushu University, 2004

Soil Air Gas and Gamma-ray Surveys at Unzen Volcano, Japan Unoki, R., Itoi, R., Fukuoka, K., Fujimitsu, Y. and Ehara, S. Proc. of the 25th New Zealand Geothermal Workshop, 137-141, 2003.11

Interference Test Analysis at Momotombo Geothermal Field, Nicaragua Porras, E., Itoi, R. and Tanaka, T. Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 155-161, 2003.11

Analysis of Production Characteristics of Well MT-27 Affected by Scale Deposition in Wellbore at Momotombo Geothermal Field, Nicaragua Khasani, Porras, E. and Itoi, R. Proc. of Int. Workshop on Earth Sci. & Tech., Kyushu Univ., 149-154, 2003.11

Lumped Parameter Model Analysis for Estimating Fractions of Reinjected Water Return to Produced Fluid at Sumikawa, Japan, Itoi, R., Matsuzaki, R., Tanaka, T. and Kamei, J. Geothermal Resources Council Trans., 27, 387-391, 2003.10

Chemical Characteristics of Rainwater at Motooka, Fukuoka Unoki, R. and Itoi, R. Memoirs of the Faculty of Engineering, Kyushu University, 63, 151-160, 2003.9

‘å’nŒ‹‡ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€”MŒðŠ·ˆä‚É‚¨‚¯‚éƒOƒ‰ƒEƒgÞ‚Ì”M“Á«‰ü‘P “¡ˆäŒõEÎãFE‘哇˜a•v Ž‘Œ¹‚Æ‘fÞA119(6•7)A403-409, 2003.7

“§…ŒW”‚Ì•ª•z‚ª•s‹ÏŽ¿‚È‘½EŽ¿”}‘Ì’†‚É“K—p‚·‚éê‡‚Ì—±ŽqˆÚ“®–@‚̉ü—Ç “¡ˆä~ˆêEŽ…ˆä—´ˆêE“c’†rº ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA11†A106-112. 2002.12

‹ãd‰ÎŽR‚Ì•¬‹C’n‘ÑŽü•Ó‚̉J…‚̉»Šw“Á«‚ÆHC‚ŒƒKƒX•úo—Ê‚ÌŒo”N•Ï‰» Œã“¡‘ìÆE‰F–ì–Ø—ŒbE“c’†rºEŽ…ˆä—´ˆê ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA11†A113-120, 2002.12

‘êã’n”M’nˆæ‚É‚¨‚¯‚éŠÒŒ³”M…‚̍¬“ü—¦‚̐„’è ¼è—ºEŽ…ˆä—´ˆêE“c’†rºEŒã“¡OŽ÷ ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA11†A121-128, 2002.12

An Analysis of pressure drops in wellbore , under low flow rate conditions, shown on a deliverability curve Khasani, Itoi, R., Tanaka, T. and Fukuda, M. Proc. of the 24th New Zealand Geothermal Workshop, 115-120, 2002.11

Environmental Effects of Volcanic Gases on a Regional Rainwater Chemistry at Kuju, Japan Itoi, R., Unoki, R., Gotoh, T. and Tanaka, T. Proc. of the 24th New Zealand Geothermal Workshop, 5-9, 2002.11

‘å’nŒ‹‡ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€‚É‚¨‚¯‚é”MŒðŠ·ˆä‚Ì•]‰¿@|”MŒðŠ·ˆä“à‚Ì’n‰º…‘R‘Η¬‚̉e‹¿| “¡ˆäŒõEH—Ñ’qE‘哇˜a•v “ú–{’n”MŠw‰ïŽA24(4)A329-338, 2002.10

Parameter Estimating by Use of Sequential Least Squares Method in Geothermal Reservoir Engineering, Itoi, R. and Tanaka, T. Proc. of Special Workshop on Earth Science and Technology, 1-8, 2002.9

Interpretation of Thermal Response Tests in Shallow Deposits Fujii, H., Akibayashi, S. and Ohshima, K. Geothermal Resources Council Trans., 26, 143-148, 2002.9

’n‰º…—¬‚ê‚Ì‘¶Ý‚·‚é‘å’nŒ‹‡Œ^ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€‚É‚¨‚¯‚é”MŒðŠ·ˆäŽdã‚°‚¨‚æ‚эBˆä”z’u‚ÌŒŸ“¢ “¡ˆäŒõ “ú–{’n”MŠw‰ïŽA24(2)A191-205, 2002.4

Application of Sequential Least Squares Method for Estimating Fraction of Reinjected Water Return to Produced Fluid in Water Dominated Geothermal Reservoir Itoi, R., Tanaka, T. and Fukuda, M. Proc.of International Workshop on Intelligent Mining Systems, 41-46, 2002.4

‘å’nŒ‹‡ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€”MŒðŠ·ˆä‚É‚¨‚¯‚鉷“x‰ž“šŽŽŒ±‰ðÍ “¡ˆäŒõEH—Ñ’q Ž‘Œ¹‚Æ‘fÞA118(2)A75-80, 2002.2

‘å’nŒ‹‡ƒq[ƒgƒ|ƒ“ƒvƒVƒXƒeƒ€‚É‚¨‚¯‚é”MŒðŠ·ˆäÝŒv‚ɂ‚¢‚Ă̍œK‰»Žè–@‚ÌŒŸ“¢ “¡ˆäŒõ “ú–{’n”MŠw‰ïŽA24(1)A29-46, 2002.1

ƒgƒŒ[ƒT[ŽŽŒ±ƒf[ƒ^‰ðÍ‚É—p‚¢‚é“KØ‚ȏ‰Šú’l‚̐„’è–@ ‹àŠÛ‹M•FE“c’†rºEŽ…ˆä—´ˆêE•Ÿ“c“¹”Ž ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA10†A135-141, 2001.12

Bˆäƒ‚ƒfƒ‹‚ð—p‚¢‚½’n”M¶ŽYˆä‚Ì—¬‘̐¶ŽY”\—Í‚Ì•]‰¿ •OŠ_Œ›EƒJƒTƒjE“c’†rºEŽ…ˆä—´ˆêE•Ÿ“c“¹”Ž ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA10†A142-148, 2001.12

’n”MBˆä“à‚Ì‹C‰t“ñ‘Š—¬“®‰ðÍ‚É‹y‚Ú‚·BŠÇ‚Ì‘Š‘Αe“x‚ƃ{ƒCƒh—¦‚̉e‹¿ ¼‰Y^‘¾˜YEƒJƒTƒjE“c’†rºEŽ…ˆä—´ˆêE•Ÿ“c“¹”Ž ‹ã‘å’n”ME‰ÎŽRŒ¤‹†•ñA10†A149-157, 2001.12

ƒ{[ƒŠƒ“ƒOE‚ð‰ß‚¬‚é’n‰º…—¬‚ê‚ÉŠÖ‚·‚鐔’l‰ðÍ‚¨‚æ‚щŽ‹‰»ŽÀŒ± |B“à‚ɉ~“›áŠQ•¨‚ª‘¶Ý‚·‚éê‡| “¡ˆäŒõEH—Ñ’qE²X–Ø‹v˜YE¬•ì—mK ’n‰º…Šw‰ïŽA43(4)App.313]325, 2001.11

ŒXŽÎBˆäƒfƒUƒCƒ“‚É‚¨‚¯‚鐶ŽYƒVƒXƒeƒ€‚̍œK‰» “¡ˆäŒõ Î–û‹Zp‹¦‰ïŽA66(5)A529-539, 2001.9