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C collected by precipitation and gas-strip methods for dating groundwaterNakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki; Kato, Toshihiro
Radiocarbon, 58(3), p.491 - 503, 2016/09
Times Cited Count：6 Percentile：24.08(Geochemistry & Geophysics)Dissolved inorganic carbon (DIC) for C analysis of groundwater is usually extracted by a gas-strip or precipitation method. In this study, the certainty of the two methods for C dating were confirmed. DIC and C concentrations obtained by the gas-strip method were close to the theoretically predicted C value. Conversely, the C value obtained by the precipitation method always showed higher values than the predicted values. The difference in C value between gas-strip and precipitation methods was assumed to arise owing to contamination of modern carbon used in the precipitation method. The applicability of the precipitation method for groundwater should be considered carefully according to the DIC, C concentration of groundwater and purpose of the study being conducted.
Hayashi, Kentaro*; Katayanagi, Nobuko*; Fumoto, Tamon*; Hasegawa, Toshihiro*; Ono, Keisuke*; Katata, Genki
Nogyo Kankyo Gijutsu Kenkyojo Heisei 25 Nendo Kenkyu Seika Joho, 30 (Internet), 2 Pages, 2014/03
no abstracts in English
][1]benzothiophene monolayer on bismuth-terminated Si(111) vicinal surfaces with wettability optimizationOtomo, Manabu; Tsuchida, Yuya*; Muraya, Naoki*; Yanase, Takashi*; Sakai, Seiji; Yonezawa, Tetsu*; Nagahama, Taro*; Hasegawa, Tetsuya*; Shimada, Toshihiro*
Journal of Physical Chemistry C, 117(22), p.11555 - 11561, 2013/06
Times Cited Count：2 Percentile：8.53(Chemistry, Physical)We report in-plane orientation control of newly developed high-mobility organic semiconductor: 2,7-diphenyl[1]benzothieno[3,2-][1]benzothiophene (DPh-BTBT). As previously reported on monolayer pentacene, it was revealed that bunched steps on vicinal Si(111) with bismuth termination break the surface symmetry and reduce three-fold symmetry of DPh-BTBT grains into quasi-single orientation. Interestingly, the critical step height necessary for the orientation control was different from that of pentacene. We examined several mechanisms of orientation control and concluded that the facet nano structure fabricated by step bunching is working as an anisotropic template. We will also show the wettability control of bismuth terminated silicon surface and show that the growth mode of DPh-BTBT is dependent on the surface nanostructure of Bi-Si.
Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Hasegawa, Kazuo; Takeda, Osamu; Yoshikawa, Hiroshi; Matsuoka, Masanori*; Otani, Toshihiro*; Kako, Eiji*; et al.
Proceedings of 11th International Conference on Nuclear Engineering (ICONE-11) (CD-ROM), 6 Pages, 2003/04
no abstracts in English
Ouchi, Nobuo; Akaoka, Nobuo*; Asano, Hiroyuki*; Chishiro, Etsuji; Hasegawa, Kazuo; Takeda, Osamu*; Yoshikawa, Hiroshi; Matsuoka, Masanori*; Otani, Toshihiro*; Kako, Eiji*; et al.
Proceedings of 21st International Linear Accelerator Conference, p.488 - 490, 2003/00
Development of a superconducting proton linac is in progress in collaboration with KEK. In order to demonstrate cavity performance and to study stable accelerating field in a pulsed operation, a 600MHz superconducting cryomodule has been fabricated. The cryomodule includes two 5-cell superconducting cavities of 
=0.6 and is designed to perform 2K operation. Cold tests of the cryomodule have been performed at the temperature of 4K and 2K. In the tests, heat leak to the cavities, loaded quality factors, tuning sensitivities, frequency shifts against helium vessel pressure and Lorentz force detuning of the cavities were measured. Most of the measured data agreed with their design values, except for the heat leak and the Lorentz force detuning. As the preliminary horizontal test of the cryomodule, high power RF test has been also performed, where the surface peak fields of 10 and 16 MV/m were achieved in CW and pulsed operation, respectively. Now, the optimization of the RF control system is in progress to demonstrate stable accelerating field in a pulsed operation.
; ; ; ; ; ; ; Oikawa, Toshihiro; ; ; et al.
Fusion Energy 1996, p.885 - 890, 1997/05
no abstracts in English
Enrichment study for paddy rice with a focus on its effect on nitrogen cycleHayashi, Kentaro*; Hasegawa, Toshihiro*; Tokida, Takeshi*; Ono, Keisuke*; Matsuda, Kazuhide*; Toyoda, Sakae*; Yano, Midori*; Sudo, Shigeto*; Wagai, Rota*; Matsushima, Miwa*; et al.
no journal, ,
National Institute for Agro-Environmental Sciences, Japan, established new Free-Air CO Enrichment (FACE) facilities for paddy rice in central Japan (Tsukuba FACE) in April, 2010. Early FACE studies were originally designed to investigate changes in plant growth, crop yield, and carbon cycle under elevated CO and temperature. In addition to these research agenda, a three-year project at Tsukuba FACE that assesses the changes in nitrogen cycle due to climate manipulation (FACE-N) started in April, 2010. The FACE-N project has the following themes: (1) atmosphere-paddy exchange of nitrogen; (2) nitrogen-related processes in a soil-rice system; and (3) development of the sophisticated nitrogen cycling model at a plot scale and of the regional nitrogen assessment system using remote-sensing technique and geographic information system (GIS).
Nakata, Kotaro*; Hasegawa, Takuma*; Iwatsuki, Teruki; Kato, Toshihiro
no journal, ,
C concentration in dissolved inorganic carbon is available index to infer groundwater residence time. We confirmed precision and accuracy during DIC collection methods such as degassing and precipitation by using NaHCO
solution and natural groundwater.
Kato, Toshihiro; Iwatsuki, Teruki; Munemoto, Takashi; Kubota, Mitsuru; Hayashida, Kazuki; Nakata, Kotaro*; Hasegawa, Takuma*
no journal, ,
no abstracts in English
Kato, Toshihiro; Iwatsuki, Teruki; Nakata, Kotaro*; Hasegawa, Takuma*
no journal, ,
no abstracts in English
Ota, Kunio; Shigeta, Naotaka; Marui, Atsunao*; Uchida, Toshihiro*; Kiho, Kenzo*; Hasegawa, Takuma*
no journal, ,
JAEA commenced a surface-based investigation programme under the collaboration with AIST and CRIEPI, which would focus on the establishment of comprehensive site characterisation technology and the enhancement of its reliability through the characterisation of the geological environment at the coastal region in Horonobe, Hokkaido. Here the programme, particularly background, goal, main issues and timeplan, is overviewed.
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki
no journal, ,
Groundwater dating using C, 
He, noble gas method was conducted in Mizunami Underground Research laboratory. The availability of degassing method for , flux estimation method for He were examined. It was identified that the groundwater have been derived in glacial age. The integration of distinct dating method is available to estimate precise age of groundwater.
Otomo, Manabu; Tsuchida, Yuya*; Sakai, Seiji; Hasegawa, Tetsuya*; Shimada, Toshihiro*
no journal, ,
no abstracts in English
Munemoto, Takashi; Omori, Kazuaki; Hasegawa, Takashi; Kato, Toshihiro; Yuguchi, Takashi; Iwatsuki, Teruki; Hama, Katsuhiro
no journal, ,
no abstracts in English
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki
no journal, ,
Groundwater dating was conducted to Mizunami Underground Research Laboratory (MIU). C age and He age were estimated about 20,000 years around MIU. The estimation of noble gas temperature is also conducted. The estimated recharge temperature is around 6
C. This temperature is about 9C cooler than present annual average temperature, which agree with estimation of modern analog method conducted near MIU.
Iwatsuki, Teruki; Kato, Toshihiro; Nakata, Kotaro*; Hasegawa, Takuma*
no journal, ,
Water chemistry, isotopes and chlorofluorocarbons in groundwater down to a depth of 500 m were monitored in the Mizunami Underground Research Laboratory (MIU), Japan. The monitoring of water chemistry for more than 10 years shows the increase of shallow water infiltration in UHFD at depths between 200 - 400 m. Based on 3H and CFCs concentrations the mixing proportion of shallow groundwater was estimated up to about 50 %. On the other hand groundwater in LSFD at the depth of 500 m was identified relatively isolated condition from the hydraulic disturbance by the facility construction. The residence time of the isolated groundwater was estimated 18 - 25 ka by C.
Hasegawa, Takuma*; Nakata, Kotaro*; Tomioka, Yuichi*; Ota, Tomoko*; Hama, Katsuhiro; Iwatsuki, Teruki; Kato, Toshihiro*; Hayashida, Kazuki
no journal, ,
no abstracts in English
