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Sato, Tatsuhiko
Oyo Butsuri, 92(11), p.684 - 687, 2023/11
Development and promotion of the PHITS code will be introduced.
Yoneda, Yasuhiro
Oyo Butsuri, 91(12), p.729 - 735, 2022/12
It is important to determine whether a sample is a single phase or not in order to improve the quality of ferroelectrics. Therefore, we have succeeded in developing a detection method for trace amounts of segregated phases by using two-body correlation distribution function (PDF) in addition to X-ray diffraction, which has been conventionally used to detect impurities. In the X-ray diffraction pattern of the BaTiO
-BiFeO solid solution, it appears as a single phase with a rhombohedral structure. However, when the PDF was calculated from the obtained diffraction pattern, it was found that not only the component derived from the rhombohedral crystal structure calculated from the average structure but also the BaTiO component was mixed and segregated. By using PDF in this way, it has become possible to detect fine segregation phases on the order of nanoscale.
Tsuchida, Hidetsugu*; Majima, Takuya*; Kai, Takeshi
Oyo Butsuri, 91(9), p.553 - 557, 2022/09
In recent years, basic research has been conducted to understand the biological effects of radiation at the atomic level toward advancing particle beam cancer treatment. Here we show some recent results on the basic process of biomolecular damage caused by ion beams in liquid water. A biomolecular solution target was introduced to the vacuum by a liquid molecular beam or microdroplet method. Secondary ion mass spectrometry was applied to measure the fragments of biomolecules emitted from a target irradiated with an ion beam. For the simulation study using a PHITS code, physical nature of secondary electrons produced by ion beam in water was analyzed. The experimental and simulation research determined the energy range of secondary electrons involved in damaging biomolecules in liquid water caused by ion beams. The damage process by secondary electrons near the ion track is described.
Yamada, Susumu; Machida, Masahiko; Tanaka, Minori*; Seki, Katsumi*; Arikawa, Taro*
Nihon Oyo Suri Gakkai Rombunshi, 31(1), p.20 - 43, 2021/03
no abstracts in English
Yoshigoe, Akitaka
Oyo Butsuri Gakaki Hakumaku, Hyomen Butsuri Bunkakai Newsletter, (168), p.52 - 53, 2019/09
When I become a permanent secretary of the Thin Film and Surface Physics Subcommittee of the Japan Society of Applied Physics, I use Newsletter to introduce a part of my research.
Yokoyama, Keiichi; Matsuoka, Leo*
Ryoshi Uoku No Shin Tenkai; Suri Kozo No Shinka To Oyo, p.228 - 242, 2019/08
Quantum walk is the quantum mechanical counter part of the classical random walk, which is known as mathematical model of diffusion process. By applying this new concept to light-matter interaction, a new isotope separation scheme is shown to be emerged. In addition, its advancements and forthcoming challenges are introduced.
Matsuo, Mamoru
Oyo Butsuri, 86(1), p.31 - 35, 2017/01
Spin-current generation by fluid motion is investigated. Spin-rotation coupling emerges in a rotating object and allows the angular momentum conversion from mechanical angular momentum into spins. We predicted that the spin current is mechanically generated along the vorticity gradient of the liquid metal pipe flow. Such spin-mechanical effect is experimentally confirmed by electric voltage generation in liquid metals. The use of the interconversion between spin and mechanical angular momentum opens up a new field of spintronics, where spin and mechanical motion are harmonized.
Shibata, Hiroki; Hayashi, Hirokazu; Koyama, Tadafumi*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 83(7), p.532 - 536, 2015/07
Times Cited Count：2 Percentile：1.67(Electrochemistry)The electrochemical properties of curium in a LiCl-KCl eutectic melt were studied in the temperature range of 718-823 K. A small electrochemical cell used in this study was designed for the electrochemical measurement with a small amount (1-20 mg) of the highly radioactive minor actinides contained in molten salts achieved in a hot cell. Our data of apparent standard potentials of a Cm
/Cm couple are reasonably in agreement with Osipenko's data (2011) and are lower than Martinot's data (1975). The validity of our data and the reported apparent standard potentials were discussed.
Imazono, Takashi
Oyo Butsuri, 83(4), p.288 - 292, 2014/04
We have developed a soft X-ray flat-field spectrograph capable to detect soft X-ray emissions in 50-4000 eV with high spectral resolution. The spectrograph in combination with an electron microscope such as transmission electron microscope (TEM) and electron probe micro-analyzer (EPMA) makes it possible to simultaneously perform not only the structural and elemental analyses of such functional materials as lithium-ion batteries and solar cells, but also chemical-bonding states analysis in the nano-scale area. In this article, the development of the soft X-ray flat-field spectrograph and preliminary experimental results measured by the spectrograph installed in EPMA and TEM are described.
Kawachi, Naoki
Oyo Butsuri, 83(4), p.310 - 311, 2014/04
no abstracts in English
Okamoto, Yoshihiro; Nakada, Masami; Akabori, Mitsuo; Komamine, Satoshi*; Fukui, Toshiki*; Ochi, Eiji*; Nitani, Hiroaki*; Nomura, Masaharu*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 81(7), p.543 - 546, 2013/07
Times Cited Count：7 Percentile：17.86(Electrochemistry)The molten state of simulated high-level waste glass and the behavior of ruthenium element in the melt were investigated by using synchrotron radiation based X-ray imaging technique. Melting, generating and moving of bubbles, condensation and sedimentation of ruthenium element were observed dynamically in continuous 12-bit gray-scale images from the CCD camera. X-ray intensity was obtained easily by digitizing gray-scale values in the image. The existence of ruthenium element is emphasized as a black color in the CCD image at X-ray energy higher than the Ru K-absorption edge. Position sensitive imaging X-ray absorption fine structure (XAFS) measurement was also performed to clarify the chemical state of ruthenium element in the melt.
Ti
O
(110) film electrode for lithium batteriesKim, K.-S.*; Tojigamori, Takeshi*; Suzuki, Kota*; Taminato, So*; Tamura, Kazuhisa; Mizuki, Junichiro; Hirayama, Masaaki*; Kanno, Ryoji*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 80(10), p.800 - 803, 2012/10
Times Cited Count：13 Percentile：29.85(Electrochemistry)Electrochemical properties and structure changes of nano-sized LiTiO during lithium (de)intercalation wereinvestigated using a two-dimensional thin film electrode. LiTiO thin films were deposited on a Nb:SrTiO
(110)substrate by a pulsed laser deposition technique. In situ X-ray diffraction measurements clarified the drastic structural changes of the LiTiOfilm upon soaking in the electrolyte and during the first intercalation and deintercalation processes. The surfaceregion of LiTiO had a different structure from the bulk during electrochemical cycling and could cause the nanosizedLiTiO electrodes to have high capacities and poor stabilities.
Oshima, Takeshi
Oyo Butsuri, 81(3), p.216 - 219, 2012/03
Radiation particles such as electrons, protons, and heavy ions exist in space, and semiconductor device installed in space applications such as artificial satellites show the degradation of their electrical performance, and nondestructive and destructive malfunctions by the incidence of such particles. In this article, first of all, radiation environments in space are introduced and then, radiation effects on semiconductor devices (total ionizing dose effect, displacement damage effect, and single event effects) are explained. In addition, as an example of the displacement damage effect, study of radiation degradation mechanism of triple junction solar cells developed for space applications due to proton/electron irradiation is introduced. Also, as an example of single event effects, the recent study of single event transient in Large Scale Integration (LSI) is explained.
Kitawaki, Shinichi; Sakamura, Yoshiharu*
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 79(12), p.975 - 976, 2011/12
no abstracts in English
Oka, Kiyoshi; Seki, Takeshi; Nishimura, Akihiko
Oyo Butsuri, 80(12), p.1069 - 1072, 2011/12
A composite-type optical fiberscope was developed for maintenance research and development of nuclear facilities by JAEA. It can coaxially deliver both a high energy laser beam for micro processing and an image from processing targets. Development of minimally invasive laser treatment devices were introduced by use of the composite-type optical fiber scope.
-ray analysis methodOshima, Masumi; Matsuo, Motoyuki*; Shozugawa, Katsumi*
Oyo Butsuri, 80(11), p.948 - 954, 2011/11
The multiple -ray detection method has been proved to be a high-resolution and high-sensitivity method in application to nuclide quantification. The neutron prompt -ray analysis method is successfully extended by combining it with the -ray detection method, which is called Multiple prompt -ray analysis, MPGA. In this review we show the principle of this method and its characteristics. Several examples of its application to environmental samples, especially river sediments in the urban area and sea sediment samples are also described.
Yasuda, Ryo
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 79(11), p.912 - 913, 2011/09
no abstracts in English
Yasuda, Ryo; Shiozawa, Masahiro*; Katagiri, Masaki*; Takenaka, Nobuyuki*; Sakai, Takuro; Hayashida, Hirotoshi; Matsubayashi, Masahito
Denki Kagaku Oyobi Kogyo Butsuri Kagaku, 79(8), p.614 - 619, 2011/08
Times Cited Count：1 Percentile：2.43(Electrochemistry)
Ge
alloy layer studied by real-time photoelectron spectroscopyOgawa, Shuichi*; Hozumi, Hideaki*; Yoshigoe, Akitaka; Ishizuka, Shinji*; Kaga, Toshiteru*; Teraoka, Yuden; Takakuwa, Yuji*
Oyo Butsuri Gakkai Hakumaku, Hyomen Butsuri Bunkakai, Shirikon Tekunoroji Bunkakai Kyosai Tokubetsu Kenkyukai Kenkyu Hokoku, p.67 - 70, 2011/01
The oxidation-enhanced Ge atoms condensation kinetics on an SiGe alloy layer has been investigated by the real-time photoemission spectroscopy using the synchrotron radiation. The SiGe alloy layer was formed with a thermal evaporation method on a p-type Si(001) surface, and this alloy layer was oxidized at Langmuir-type adsorption. During oxidation at 773 KC, it is found that the Ge atoms are not oxidized, only SiO
film is formed on the SiGe alloy layer. Furthermore, the desorption of GeO molecules does not occur during the oxidation of alloy layer. On the other hand, not only Si atoms but also Ge atoms are oxidized at room temperature. This difference can be explained using the unified oxidation model mediated by the point defect generation, namely it is suggested that a lot of vacancies are generated during oxidation of the SiGe alloy layer at 773K and Ge atoms diffuse through these vacancies.
Yamada, Susumu; Igarashi, Ryo; Okumura, Masahiko*; Imamura, Toshiyuki*; Machida, Masahiko
Oyo Suri, 20(2), p.132 - 147, 2010/06
The density matrix renormalization group (DMRG) method is a numerical calculation technique to obtain the ground state of quantum lattice systems whose degree of freedoms exponentially grows with the size of the lattice sites and particles (or spins in interacting spin systems). Its advantage is excellent accuracy comparable to the exact diagonalization scheme even in considerably large number of sites and particles (spins). However, the technique has been originally developed for one-dimensional systems. Therefore, the extension to higher dimensional lattices systems is in great demand since major rich physics such as superconductivity and ferromagnetism frequently occurs in two or three dimensions. This paper describes a parallelization strategy of the technique to calculate quasi-two dimensional (ladder) systems toward the next generation supercomputer and reports its good parallel efficiency on T2K supercomputer HA8000 at University of Tokyo. Moreover, typical quantum phenomena obtained by using the parallelized code are exhibited and some remarks on parallelization scheme in the next generation supercomputer are mentioned.
