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Journal Articles

Post-earthquake rapid resealing of bedrock flow-paths by concretion-forming resin

Yoshida, Hidekazu*; Yamamoto, Koshi*; Asahara, Yoshihiro*; Maruyama, Ippei*; Karukaya, Koichi*; Saito, Akane*; Matsui, Hiroya; Mochizuki, Akihito; Jo, Mayumi*; Katsuta, Nagayoshi*; et al.

Communications Engineering (Internet), 3, p.67_1 - 67_10, 2024/05

A capability to permanently seal fluid flow-paths through bedrock, like boreholes or underground tunnels, is needed to ensure the long-term safety and effectiveness of many underground activities e.g. CO$$_{2}$$ storage, hydrocarbon field abandonment, and nuclear waste disposal. Commonly used cementitious seals may not be sufficiently durable due to chemical and physical degradation. Learning from natural calcite (CaCO$$_{3}$$) concretion formation, a more durable sealing method was developed using a "concretion-forming solvent". The method was tested by sealing flow-paths next to a tunnel in an underground research laboratory at 350 meters depth. The flow-paths initially sealed rapidly, then resealed after disturbance by earthquakes (M5.4). The treated rock recovered its very low natural permeability, demonstrating permanent sealing that is robust.

Journal Articles

Rapid and long-lasting bedrock flow-path sealing by a "concretion-forming resin"; Results from ${it in-situ}$ evaluation tests in an Underground Research Laboratory, Horonobe, Japan

Yoshida, Hidekazu*; Yamamoto, Koshi*; Asahara, Yoshihiro*; Maruyama, Ippei*; Karukaya, Koichi*; Saito, Akane*; Matsui, Hiroya; Mochizuki, Akihito; Katsuta, Nagayoshi*; Metcalfe, R.*

Powering the Energy Transition through Subsurface Collaboration; Proceedings of the 1st Energy Geoscience Conference (Energy Geoscience Conference Series, 1), 20 Pages, 2024/00

A capability to permanently seal fluid flow-paths in bedrock, such as natural faults/fractures, and damaged zones around boreholes/excavations, is needed to ensure the long-term safety and effectiveness of many underground activities. Cementitious materials are commonly used as seals, however these materials unavoidably undergo physical and chemical degradation, therefore potentially decreasing seal durability. In order to solve these problems, a more durable sealing method using concretion-forming resin has been developed by learning from natural calcite (CaCO$$_{3}$$) concretion formation. The sealing capability of resin was tested by ${it in-situ}$ experiments on bedrock flow-paths in an underground research laboratory (URL), Hokkaido, Japan. The results showed a decrease the permeability rapidly down to 1/1,000 of the initial permeability due to calcite precipitation over a period of one year. During the experiment inland earthquakes occurred with foci below the URL (depths 2-7 km and maximum magnitude 5.4). Due to the earthquakes the hydraulic conductivities of the flow-paths sealed initially by concretion-forming resin increased. However, these flow-paths subsequently resealed rapidly, and within a few months recovered the same hydraulic conductivities as before the earthquakes. This new technique for rapidly producing long-lasting seals against fluid flow through rocks will be applicable to many kinds of underground activities.

Journal Articles

Cation distribution and magnetic properties in ultrathin (Ni$$_{1-x}$$Co$$_{x}$$)Fe$$_{2}$$O$$_{4}$$ (x=0-1) layers on Si(111) studied by soft X-ray magnetic circular dichroism

Wakabayashi, Yuki*; Nonaka, Yosuke*; Takeda, Yukiharu; Sakamoto, Shoya*; Ikeda, Keisuke*; Chi, Z.*; Shibata, Goro*; Tanaka, Arata*; Saito, Yuji; Yamagami, Hiroshi; et al.

Physical Review Materials (Internet), 2(10), p.104416_1 - 104416_12, 2018/10

 Times Cited Count:14 Percentile:44.57(Materials Science, Multidisciplinary)

Journal Articles

Antiferromagnetic interaction between A'-site Mn spins in A-site-ordered perovskite YMn$$_3$$Al$$_4$$O$$_{12}$$

Toyama, Takenori*; Saito, Takashi*; Mizumaki, Masaichiro*; Agui, Akane; Shimakawa, Yuichi*

Inorganic Chemistry, 49(5), p.2492 - 2495, 2010/01

 Times Cited Count:28 Percentile:73.84(Chemistry, Inorganic & Nuclear)

no abstracts in English

Journal Articles

Various valence states of square-coordinated Mn in A-site-ordered perovskites

Long, Y.*; Saito, Takashi*; Mizumaki, Masaichiro*; Agui, Akane; Shimakawa, Yuichi*

Journal of the American Chemical Society, 131(44), p.16244 - 16247, 2009/10

 Times Cited Count:64 Percentile:80.52(Chemistry, Multidisciplinary)

A-site-ordered perovskites LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ and LaMn$$_{3}$$Ti$$_{4}$$O$$_{12}$$ were synthesized under high-pressure and high-temperature conditions. The charge formula of LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ was found to be LaMn$$_{3}$$Cr$$_{4}$$O$$_{12}$$ with Mn$$^{3+}$$ at the square-coordinated A site. The valence of the A-site Mn ions in LaMnTi$$_{4}$$O$$_{12}$$ appeared to be less than +2, and the charge combination in this compound seemed to be LaMnTi$$_{4}$$O$$_{12}$$. Although the square-coordinated A site in A-site-ordered perovskites has been widely known to be occupied by Jahn-Teller active Mn$$^{3+}$$, the present results show that the valence of Mn at the A site can vary from +3 to possible +1.67.

Journal Articles

Resonant O K$$alpha$$ emission spectroscopy of layered manganate La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Nordgren, J.*; Usuda, Manabu; Saito, Tomohiko*; Moritomo, Yutaka*

Journal of Electron Spectroscopy and Related Phenomena, 144-147, p.589 - 592, 2005/06

 Times Cited Count:1 Percentile:5.61(Spectroscopy)

Current research in the perovskite and layered perovskite-type manganese oxides has expanded to include the study of electronic and magnetic properties such as the colossal magnetoresistance (CMR), orbital ordering and charge ordering. The O K$$alpha$$ soft X-ray emission and absorption spectra (XES and XAS) of La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$ were measured at selected excitation energies in order to investigate the electronic structure. The measurements were carried out by using a soft X-ray emission spectrometer at beamline BW3 at HASYLAB, Germany. The dependence of O K$$alpha$$ XES on excitation-energy was observed. It is attributed the different site of oxygen ions.

Journal Articles

Resonant Mn $$L$$ Emission spectra of layered manganite La$$_{1.2}$$Sr$$_{1.8}$$Mn$$_{2}$$O$$_{7}$$

Agui, Akane; Butorin, S. M.*; K$"a$$"a$mbre, T.*; S${aa}$the, C.*; Saito, Tomohiko*; Moritomo, Yutaka*; Nordgren, J.*

Journal of the Physical Society of Japan, 74(6), p.1772 - 1776, 2005/06

 Times Cited Count:8 Percentile:47.86(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

High energy resolution magnetic circular dichroism measurement of the ferrite family

Agui, Akane; Saito, Yuji; Yoshigoe, Akitaka; Nakatani, Takeshi*; Matsushita, Tomohiro*; Mizumaki, Masaichiro*

Surface Review and Letters, 9(2), p.843 - 848, 2002/04

 Times Cited Count:4 Percentile:25.55(Chemistry, Physical)

no abstracts in English

Journal Articles

First results from the actinide science beamline BL23SU at SPring-8

Saito, Yuji; Nakatani, Takeshi*; Matsushita, Tomohiro*; Agui, Akane; Yoshigoe, Akitaka; Teraoka, Yuden; Yokoya, Akinari

Nuclear Instruments and Methods in Physics Research A, 474(3), p.253 - 258, 2001/12

 Times Cited Count:77 Percentile:97.45(Instruments & Instrumentation)

The present performance of a soft X-ray bealmine BL23SU at SPring-8 is described. The resolving power realized on a varied-line-spacing plane grating monochromator connected to a was estimated to be better than 10000 at 400 eV and 6500 at 867 eV. In addition, reasonable photon flux of more than 10$$^{11}$$ photons/sec/100mA/0.02% b.w. is available in the energy range of 0.5-1.8 keV at experimental stations.

Journal Articles

First results from the actinide science beamline BL23SU at SPring-8

Saito, Yuji; Nakatani, Takeshi*; Matsushita, Tomohiro*; Agui, Akane; Yoshigoe, Akitaka; Teraoka, Yuden; Yokoya, Akinari

Nuclear Instruments and Methods in Physics Research A, 474(3), p.253 - 258, 2001/12

no abstracts in English

Journal Articles

Operation of circular dichroism measurements with periodic photon-helicity switching by an APPLE-2 type undulator at BL23SU at SPring-8

Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Matsushita, Tomohiro*; Saito, Yuji; Mizumaki, Masaichiro*; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; et al.

Hoshako, 14(5), p.339 - 348, 2001/11

no abstracts in English

Journal Articles

First operation of circular dichroism measurements with periodic photon-helicity switching by a variably polarizing undulator at BL23SU at SPring-8

Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari; Tanaka, Hitoshi*; Miyahara, Yoshikazu*; Shimada, Taihei; Takeuchi, Masao*; et al.

Review of Scientific Instruments, 72(8), p.3191 - 3197, 2001/08

 Times Cited Count:21 Percentile:71.19(Instruments & Instrumentation)

no abstracts in English

JAEA Reports

Highlights of SPring-8 BL23SU in 2000

Agui, Akane; Yoshigoe, Akitaka; Nakatani, Takeshi; Saito, Yuji; Teraoka, Yuden; Yokoya, Akinari

JAERI-Tech 2001-043, 64 Pages, 2001/07

JAERI-Tech-2001-043.pdf:17.85MB

no abstracts in English

Journal Articles

Soft X-ray absorption spectra of ilmenite family

Agui, Akane; Mizumaki, Masaichiro*; Saito, Yuji; Matsushita, Tomohiro*; Nakatani, Takeshi*; Fukaya, Atsuko*; Torikai, Eiko*

Journal of Synchrotron Radiation, 8(2), p.907 - 909, 2001/03

 Times Cited Count:10 Percentile:49.25(Instruments & Instrumentation)

no abstracts in English

Journal Articles

A Grating monochromator of BL23SU at SPring-8 covering silicon and oxygen ${it K}$-edges

Yoshigoe, Akitaka; Agui, Akane; Nakatani, Takeshi*; Matsushita, Tomohiro*; Saito, Yuji; Yokoya, Akinari

Journal of Synchrotron Radiation, 8(Part2), p.502 - 504, 2001/03

no abstracts in English

Journal Articles

Photoionization of Ne$$^{3+}$$ ions in the region of the 1${it s}$ $$rightarrow$$ 2${it p}$ autoionizing resonance

Oura, Masaki*; Yamaoka, Hitoshi*; Kawatsura, Kiyoshi*; Kimata, Junichi*; Hayaishi, T.*; Takahashi, Takehisa*; Koizumi, Tetsuo*; Sekioka, T.*; Terasawa, Michitaka*; Ito, Yo*; et al.

Physical Review A, 63(1), p.014704_1 - 014704_4, 2001/01

 Times Cited Count:15 Percentile:59.40(Optics)

no abstracts in English

Oral presentation

Study on distribution and migration of radioactive substances around the Fukushima Daiichi Nuclear Power Plant, 2; Distribution and temporal changes of air dose rate and radiocesium inventory in ground measured in flat terrain

Mikami, Satoshi; Ishikawa, Daisuke; Nakano, Masakazu; Matsuda, Norihiro; Uno, Kiichiro; Sato, Akane; Matsumoto, Shinichiro; Yamamoto, Hideaki; Saito, Kimiaki

no journal, , 

Distributions of air dose rate and inventory of radioactive cesium deposited on ground were investigated in 2013, within 80-km radial area centered around the Fukushima Daiichi Nuclear Power Plant. We revealed the characteristics of the time-dependent change of the air dose rate and the inventory by comparison with the measurement results of the past investigations.

Oral presentation

In-situ feasibility experiment for self-sealing process of EDZ and flow-paths factures learnt from spherical carbonate concretion formation

Yoshida, Hidekazu*; Yamamoto, Koshi*; Asahara, Yoshihiro*; Karukaya, Koichi*; Saito, Akane*; Matsui, Hiroya

no journal, , 

no abstracts in English

Oral presentation

In-situ feasibility experiment for self-sealing process of EDZ and flow-paths factures learnt from spherical carbonate concretion formation, 2

Yoshida, Hidekazu*; Yamamoto, Koshi*; Asahara, Yoshihiro*; Karukaya, Koichi*; Saito, Akane*; Matsui, Hiroya; Mochizuki, Akihito

no journal, , 

This report summarized the latest results of in-situ feasibility experiment for self-sealing process of EDZ and flow-paths factures in Horonobe URL of JAEA and calsite crystallization induced by concretion-forming solvent injection was observed on the fracture surface in EDZ.

Oral presentation

On J-PARC Safety Day

Saito, Fumihiro; Kasugai, Yoshimi; Bessho, Kotaro; Nakane, Yoshihiro

no journal, , 

"Safety day", on which all staff members put their safety-related efforts first, has been assigned on a certain day in late May every year in J-PARC. This is an approach to make a safer environment in J-PARC, learning from the radioactive material leak accident happened on May 23, 2013, to raise the safety consciousness of every staff and foster a safety culture at J-PARC. There are four main programs that have been held on "Safety Day" so far: meeting for sharing safety information, safety awards, lectures on safety matters, and watching the documentary video on the material leak accident. The details will be shown in the presentation.

29 (Records 1-20 displayed on this page)