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Miura, Daisuke*; Kumada, Takayuki; Sekine, Yurina; Motokawa, Ryuhei; Nakagawa, Hiroshi; Oba, Yojiro; Ohara, Takashi; Takata, Shinichi; Hiroi, Kosuke; Morikawa, Toshiaki*; et al.
Journal of Applied Crystallography, 54(2), p.454 - 460, 2021/04
Times Cited Count：1 Percentile：17.08(Chemistry, Multidisciplinary)We developed a spin-contrast-variation neutron powder diffractometry technique that extracts the structure factor of hydrogen atoms, namely, the contribution of hydrogen atoms to a crystal structure factor. Crystals of L-glutamic acid were dispersed in a dpolystyrene matrix containing 4-methacryloyloxy-2,2,6,6,-tetramethyl-1-piperidinyloxy (TEMPO methacrylate) to polarize their proton spins dynamically. The intensities of the diffraction peaks of the sample changed according to the proton polarization, and the structure factor of the hydrogen atoms was extracted from the proton-polarization dependent intensities. This technique is expected to enable analyses of the structures of hydrogen-containing materials that are difficult to determine with conventional powder diffractometry.
Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Takagi, Yasuhiko*; Nakamura, Tomoki*; Hiroi, Takahiro*; Matsuoka, Moe*; et al.
Nature Astronomy (Internet), 5(3), p.246 - 250, 2021/03
Times Cited Count：44 Percentile：97.1(Astronomy & Astrophysics)Here we report observations of Ryugu's subsurface material by the Near-Infrared Spectrometer (NIRS3) on the Hayabusa2 spacecraft. Reflectance spectra of excavated material exhibit a hydroxyl (OH) absorption feature that is slightly stronger and peak-shifted compared with that observed for the surface, indicating that space weathering and/or radiative heating have caused subtle spectral changes in the uppermost surface. However, the strength and shape of the OH feature still suggests that the subsurface material experienced heating above 300 
C, similar to the surface. In contrast, thermophysical modeling indicates that radiative heating does not increase the temperature above 200 C at the estimated excavation depth of 1 m, even if the semimajor axis is reduced to 0.344 au. This supports the hypothesis that primary thermal alteration occurred due to radiogenic and/or impact heating on Ryugu's parent body.
Kitazato, Kohei*; Milliken, R. E.*; Iwata, Takahiro*; Abe, Masanao*; Otake, Makiko*; Matsuura, Shuji*; Arai, Takehiko*; Nakauchi, Yusuke*; Nakamura, Tomoki*; Matsuoka, Moe*; et al.
Science, 364(6437), p.272 - 275, 2019/04
Times Cited Count：262 Percentile：99.73(Multidisciplinary Sciences)The near-Earth asteroid 162173 Ryugu, the target of Hayabusa2 sample return mission, is believed to be a primitive carbonaceous object. The Near Infrared Spectrometer (NIRS3) on Hayabusa2 acquired reflectance spectra of Ryugu's surface to provide direct measurements of the surface composition and geological context for the returned samples. A weak, narrow absorption feature centered at 2.72 micron was detected across the entire observed surface, indicating that hydroxyl (OH)-bearing minerals are ubiquitous there. The intensity of the OH feature and low albedo are similar to thermally- and/or shock-metamorphosed carbonaceous chondrite meteorites. There are few variations in the OH-band position, consistent with Ryugu being a compositionally homogeneous rubble-pile object generated from impact fragments of an undifferentiated aqueously altered parent body.
Ogoshi, Yurie; Satoyama, Tomonori; Kishimoto, Katsumi; Nanri, Tomohiro; Suzuki, Takeshi; Tomioka, Osamu; Takaizumi, Hirohide*; Kanno, Tomoyuki*; Maruyama, Tatsuya*
JAEA-Technology 2017-017, 152 Pages, 2017/08
JAEA-Technology-2017-017.pdf:15.97MB
At Nuclear Science Research Institute, clearance works for about 4,000 tons of extremely low-level radioactive concrete debris, which were generated from the modification activities of JRR-3 from FY 1985 to FY 1989 and stored in the waste storage facility NL, carried out. First of this clearance works, method for measuring and evaluating radioactivity concentration was approved by Minister of MEXT on July 25, 2008. And then, clearance works were started from FY 2009. Measuring and evaluating radioactivity concentration was achieved by using the approved method, and was confirmed by government. And then, clearance works were completed in FY 2014. The clearance concrete was recycled as a material for restoration works of the 2011 off the Pacific coast of Tohoku Earthquake. This report summarizes the results of measuring and evaluating radioactivity concentration, achievement of confirmation by government, recycling of cleared concrete and cost for clearance works.
Br-
-methyl-phenylalanine for tumor PET imagingHanaoka, Hirofumi*; Ohshima, Yasuhiro; Suzuki, Yurika*; Yamaguchi, Aiko*; Watanabe, Shigeki; Uehara, Tomoya*; Nagamori, Shushi*; Kanai, Yoshikatsu*; Ishioka, Noriko; Tsushima, Yoshito*; et al.
Journal of Nuclear Medicine, 56(5), p.791 - 797, 2015/05
Times Cited Count：18 Percentile：62.37(Radiology, Nuclear Medicine & Medical Imaging)Tatebe, Kazuaki; Suzuki, Yurina; Shirato, Seiichi; Sato, Yoshinori
JAEA-Data/Code 2011-024, 84 Pages, 2012/02
JAEA-Data-Code-2011-024.pdf:2.87MB
The recent society requires business activities with environmental consideration to every enterprise. Also, Japanese laws require those activities. For example, "Environmental Consideration Law" mandates publication of a report relating to the activities of environmental consideration to each enterprise over a certain size. "Act on the Rational Use of Energy" mandates the report of the results of energy consumption and the long-term plan of the rational use of energy. Moreover, "Act on Promotion of Global Warming Countermeasures" mandates the report of the greenhouse gas emissions. In addition to those, "Water Pollution Control Law" and other environmental laws as well as environmental ordinances require business activities with environmental consideration to all companies. So, it is very important for JAEA to report business activities with environmental consideration in order to build up trustful relations with the people and communities. The Environmental Data Management System has been developed as the data base of business activities with environmental consideration at JAEA and the means to promote the activities at every site and office of JAEA. This report summarizes the structure of the environmental data management system, kinds of environmental performance data treated by the system, and gathering methods of the data.
Hoshino, Tsuyoshi; Kato, Kenichi*; Natori, Yuri*; Oikawa, Fumiaki; Nakano, Natsuko*; Nakamura, Mutsumi*; Sasaki, Kazuya*; Suzuki, Akihiro*; Terai, Takayuki*; Tatenuma, Katsuyoshi*
Journal of Nuclear Materials, 417(1-3), p.684 - 687, 2011/10
Times Cited Count：52 Percentile：96.24(Materials Science, Multidisciplinary)Lithium titanate (Li
TiO
) is one of the most promising candidates among tritium breeding materials because of its good tritium release. Addition of H to inert sweep gas has been proposed for enhancing the tritium release from tritium breeding materials. However, the mass of LiTiO was decreased with time in the hydrogen atmosphere. It is assumed that the mass decrease indicates the loss of the oxygen contained in the sample caused by the change from Ti 
to Ti 
, and that the partial pressures of Li-containing species were increased in the hydrogen atmosphere. In order to decrease the mass-change at high temperature, advanced tritium breeding material with added Li should be developed to improve the physical and chemical stability in hydrogen atmosphere. In the case of the Li
TiO
samples used by the present study, LiOHHO and HTiO were proportionally mixed with the molar ratio Li/Ti of either 2.0 and 2.2. These samples are designated as L20 (Li/Ti = 2.0) and L22 (Li/Ti = 2.2), respectively. The results of XRD measurement showed that the phases in advanced tritium breeding material were as follows. L22 existed as non-stoichiometric compound LiTiO.
Yamasaki, Chisato*; Murakami, Katsuhiko*; Fujii, Yasuyuki*; Sato, Yoshiharu*; Harada, Erimi*; Takeda, Junichi*; Taniya, Takayuki*; Sakate, Ryuichi*; Kikugawa, Shingo*; Shimada, Makoto*; et al.
Nucleic Acids Research, 36(Database), p.D793 - D799, 2008/01
Times Cited Count：52 Percentile：71.15(Biochemistry & Molecular Biology)Here we report the new features and improvements in our latest release of the H-Invitational Database, a comprehensive annotation resource for human genes and transcripts. H-InvDB, originally developed as an integrated database of the human transcriptome based on extensive annotation of large sets of fulllength cDNA (FLcDNA) clones, now provides annotation for 120 558 human mRNAs extracted from the International Nucleotide Sequence Databases (INSD), in addition to 54 978 human FLcDNAs, in the latest release H-InvDB. We mapped those human transcripts onto the human genome sequences (NCBI build 36.1) and determined 34 699 human gene clusters, which could define 34 057 protein-coding and 642 non-protein-coding loci; 858 transcribed loci overlapped with predicted pseudogenes.
Suzuki, Yoshio*; Takeshima, Yuriko; Ono, Nobuaki*; Koyamada, Koji*
Nihon Bacharu Riaritei Gakkai Rombunshi, 10(2), p.231 - 240, 2005/06
A volume rendering is widely used for intuitively understanding 3-dimensionaly distribution of physical quantities. When the quantities have a nest-like distribution, however, the inside distribution cannot be observed. As one of the solution, an immersive virtual reality (VR) system is useful, since the researcher can immersively observe the distribution by using such a system. However, a plane slice sampling method conventionally used in the volume rendering has a problem that the quality of visualized images deteriorates especially in the immersive VR system. To resolve the problem, a spherical surface sampling method is applied to the volume rendering in the immersive VR system. The quality of image and the display speed are compared between these two methods.
Takeshima, Yuriko; Suzuki, Yoshio*; Matsumoto, Nobuko*; Sai, Kazunori*; Nakajima, Norihiro
Proceedings of 4th International Symposium on Advanced Fluid Information and Transdiciplinary Fluid Integration (AFI/TFI 2004), p.157 - 158, 2004/11
The Information-Technology-Based Laboratory (ITBL) project aims to construct a virtual research environment which shares intellectual resources such as the super computers by the grid computing, softwares and data in Japan and supports joint researches at a distance. In the project, two visualization systems: the PATRAS/ITBL and the AVS/ITBL have been developed. The feature of the PATRAS/ITBL is the collaborative, real-time visualization of data resulting from an execution of numerical simulations. The AVS/ITBL visualization system enables remote postprocessing visualization of any data stored on any supercomputer located in the ITBL network. The global structure and technologies of these systems are presented.
Kato, Kenichi*; Hoshino, Tsuyoshi; Natori, Yuri*; Nakamura, Mutsumi*; Sasaki, Kazuya*; Suzuki, Akihiro*; Terai, Takayuki*; Tatenuma, Katsuyoshi*
no journal, ,
no abstracts in English
O-BeO system ceramics for advanced tritium breederSuzuki, Tatsuya; Hoshino, Tsuyoshi; Natori, Yuri*; Suzuki, Jun*
no journal, ,
Mixtures of tritium breeder (lithium) and neutron multiplier (beryllium) are being considered for use in increasing the tritium breeding ratio in breeding blankets. However, lithium and beryllium react under normal operating conditions, and therefore, a high-functional tritium breeder such as lithium beryllium oxide (LiBeO) needs to be developed to compensate for this reaction under high-temperatures. In this study, we investigated methods of synthesizing LiBeO by means of solid-state reaction. We measured the weight changes of the starting powders by TG-DTA, and analyzed the chemical composition and crystal structure of the samples by ICP-AES and XRD, respectively.
Br-bromo--methyl-L-phenylalanine as a novel Br-labeled PET tracerOhshima, Yasuhiro; Hanaoka, Hirofumi*; Suzuki, Yurika*; Yamaguchi, Aiko*; Watanabe, Shigeki; Uehara, Tomoya*; Nagamori, Shushi*; Kanai, Yoshikatsu*; Ishioka, Noriko; Tsushima, Yoshito*; et al.
no journal, ,
no abstracts in English
Hasegawa, Yuri; Honda, Mitsunori; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
For environmental restoration, recycling of radioactive polluted soil has been one the latest issues. Recently, elimination of radioactive elements accompanied by growth of various crystal structures from a typical mineral in the Fukushima area was reported to be realized only by heating it with alkali salt. Since crystals with useful electronic property is possibly obtained with this processing, improvement of the processing is required to make the crystals available as more feasible materials. However, crystal growth from minerals has hardly been studied since low crystalinity of the natural soil has hindered structural analysis. Therefore, in this study, the initial stage of the crystal growth using minerals with high crystalinity was investigated.
Honda, Mitsunori; Goto, Takuya*; Sakanaka, Yoshihide*; Hasegawa, Yuri; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
no abstracts in English
Hasegawa, Yuri; Honda, Mitsunori; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
Recycling of radioactive polluted soil has been one the latest issues in environmental restoration. Among minerals in soil, weathered biotite fix Cs strongly. Recently, elimination of Cs accompanied by growth of various kind of crystal from weathered biotite was realized only by heating with alkali salt (NaCl-CaCl). Since some of those crystals are available as a functional material, further understanding of the process of crystal growth is required for selective growth. However, understating the crystal growth is difficult because WB consists of weathered and un-weathered phase. Therefore, in this study, crystal growth form un-weathered biotite was investigated. XRD measurement revealed growth of FeO, Wadalite, and pyroxene were observed from 2 
m of biotite, whereas pyroxene was not observed from 75m of biotite. In addition, pyroxene was not observed even with 2m of biotite when NaCl:CaCl=7:3. These result suggest size of biotite and NaCl:CaCl ratio affect selective growth.
Hasegawa, Yuri; Honda, Mitsunori; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
We investigated the factor of crystal growth from biotite in order to fabricate functional material from the radioactive polluted soil. Among minerals in the soil, weathered biotite is known to fix Cs strongly. Recently, elimination of Cs accompanied by growth of pyroxene, wadalite, FeO,CaCO from weathered biotite was realized by heating with alkali salt (NaCl-CaCl). In this study, selective growth of wadalite from biotite and suppression of pyroxene were observed when alkali salt with ratio of NaCl:CaCl=3:7 was utilized. This observation indicates that NaCl:CaCl ratio possibly affects selective growth of silicate mineral from biotite.
Hasegawa, Yuri; Honda, Mitsunori; Suzuki, Shinichi; Yaita, Tsuyoshi
no journal, ,
Biotite has been getting great attention in the field of reducing the volume of radioactive contaminated soil since biotite has been suggested to fix Cs strongly by theory and experiment. Recently, elimination of Cs accompanied by crystal growth of pyroxene, wadalite, FeO and CaCO by heating with mixed alkali-salt (NaCl-CaCl) was observed. In order to make them available as functional material, selective growth is required. In this study, selective growth of wadalite from biotite and suppression of pyroxene were observed when alkali salt with ratio of NaCl:CaCl=3:7 was utilized. This observation indicates that NaCl:CaCl ratio possibly affects selective growth of silicate mineral from biotite.
Segawa, Tomoomi; Kawaguchi, Koichi; Ishii, Katsunori; Nishina, Masahiro; Makino, Takayoshi; Iimura, Kenji*; Satone, Hiroshi*; Suzuki, Michitaka*; Natori, Yuri*
no journal, ,
Japan Atomic Energy Agency has developed a simplified pelletizing fuel fabrication system. In this system, the flowability of a MOX raw powder is improved by wet granulation for the pelletizing process, and the die wall lubrication method directly presses the granulated MOX powder into green pellets without adding any lubricant into the powder. The homogeneous compression is important to fabricate high-density green pellets. However, it is difficult to observe the compaction behavior in situ. Therefore, the capping phenomenon was investigated by using X-ray computed tomography and alumina powder that is highly transparent against X-rays. When lubricant was used, the breakage of the particles extended to the bottom compared with not used. This result indicates that the die wall lubrication is effective for the homogeneous compression of granulated powders.
Suzuki, Yuri*; Nagano, Hirohiko*; Kanda, Yuki*; Hiradate, Shuntaro*; Atarashi-Andoh, Mariko; Koarashi, Jun
no journal, ,
no abstracts in English
