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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：168 Percentile：99.76(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.
Finsterle, S.*; Lanyon, B.*; 
kesson, M.*; Baxter, S.*; Bergstr
m, M.*; Bockg
rd, N.*; Dershowitz, W.*; Dessirier, B.*; Frampton, A.*; Fransson, .*; et al.
Geological Society, London, Special Publications, No.482, p.261 - 283, 2019/00
Times Cited Count：5 Percentile：57.87Nuclear waste disposal in geological formations relies on a multi-barrier concept that includes engineered components which in many cases includes a bentonite buffer surrounding waste packages and the host rock. An SKB's (Swedish Nuclear Fuel and Waste Management Co.) Modelling Task Force project facilitated to improve the overall understanding of rock - bentonite interactions, as 11 teams used different conceptualisations and modelling tools to analyse the in-situ experiment at the 
ps Hard Rock Laboratory. The exercise helped identify conceptual uncertainties that led to different assessments of the relative importance of the engineered and natural barrier subsystems and of aspects that need to be better understood to arrive at reliable predictions of bentonite wetting.
Kim, J.*; Fujiwara, Akihiko*; Sawada, Tomohiro*; Kim, Y.*; Sugimoto, Kunihisa*; Kato, Kenichi*; Tanaka, Hiroshi*; Ishikado, Motoyuki*; Shamoto, Shinichi; Takata, Masaki*
IUCrJ, 1(3), p.155 - 159, 2014/05
Times Cited Count：2 Percentile：23.22(Chemistry, Multidisciplinary)Using a charge density analysis based on synchrotron radiation X-ray powder diffraction data, we found that the charge carriers only accumulated in the iron layer of the superconducting phase of LaFeAsO
F
at low temperatures. Analysis of the electrostatic potential distribution revealed the concerted enhancement of the electronic polarization of the As ions and the carrier redistribution.
collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 84(1), p.012006_1 - 012006_18, 2011/07
Times Cited Count：25 Percentile：71.35(Astronomy & Astrophysics)We report on the event structure and double helicity asymmetry (
) of jet production in longitudinally polarized collisions at = 200 GeV. Photons and charged particles were measured by the PHENIX experiment. Event structure was compared with the results from PYTHIA event generator. The production rate of reconstructed jets is satisfactorily reproduced with the next-to-leading-order perturbative QCD calculation. We measured = -0.0014 
0.0037 at the lowest 
bin and -0.0181 0.0282 at the highest bin. The measured is compared with the predictions that assume various 
distributions.
collisions at = 200 and 62.4 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review C, 83(6), p.064903_1 - 064903_29, 2011/06
Times Cited Count：162 Percentile：99.44(Physics, Nuclear)Transverse momentum distributions and yields for 
, and 
in collisions at = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the RHIC. We present the inverse slope parameter, mean transverse momentum, and yield per unit rapidity at each energy, and compare them to other measurements at different collisions. We also present the scaling properties such as 
and 
scaling and discuss the mechanism of the particle production in collisions. The measured spectra are compared to next-to-leading order perturbative QCD calculations.
and Au+Au collisions at 
= 200 GeVAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Yasuyuki*; Al-Bataineh, H.*; Alexander, J.*; Aoki, Kazuya*; Aphecetche, L.*; Aramaki, Y.*; et al.
Physical Review C, 83(4), p.044912_1 - 044912_16, 2011/04
Times Cited Count：8 Percentile：51.93(Physics, Nuclear)Measurements of electrons from the decay of open-heavy-flavor mesons have shown that the yields are suppressed in Au+Au collisions compared to expectations from binary-scaled collisions. Here we extend these studies to two particle correlations where one particle is an electron from the decay of a heavy flavor meson and the other is a charged hadron from either the decay of the heavy meson or from jet fragmentation. These measurements provide more detailed information about the interaction between heavy quarks and the quark-gluon matter. We find the away-side-jet shape and yield to be modified in Au+Au collisions compared to collisions.
+ collisions at = 200 GeV and scaling properties of hadron productionAdare, A.*; Afanasiev, S.*; Aidala, C.*; Ajitanand, N. N.*; Akiba, Y.*; Al-Bataineh, H.*; Alexander, J.*; Aoki, K.*; Aphecetche, L.*; Armendariz, R.*; et al.
Physical Review D, 83(5), p.052004_1 - 052004_26, 2011/03
Times Cited Count：156 Percentile：98.48(Astronomy & Astrophysics)The PHENIX experiment at RHIC has measured the invariant differential cross section for production of 
, 
, 
and 
mesons in collisions at = 200 GeV. The spectral shapes of all hadron transverse momentum distributions are well described by a Tsallis distribution functional form with only two parameters, 
and 
, determining the high 
and characterizing the low regions for the spectra, respectively. The integrated invariant cross sections calculated from the fitted distributions are found to be consistent with existing measurements and with statistical model predictions.
Hanh, T. T.*; Takahashi, Shuichi; Chen, J.; Sawada, Shinichi; Maekawa, Yasunari
Journal of Applied Polymer Science, 114(1), p.231 - 237, 2009/06
Times Cited Count：6 Percentile：23.2(Polymer Science)Polymer electrolyte membranes (PEMs) containing alkylsulfonic acid grafts can be prepared by radiation-induced graft copolymerization of methyl acrylate (MA) and methyl methacrylate (MMA) into a poly(ethylene-co-tetrafluoroethylene) (ETFE) film followed by sulfonation of the MA units in the copolymer grafts using an equimolar complex of chlorosulfonic acid and 1,4-dioxane (ClSO
H-Complex). The grafted films with 33-79 % MA units are treated with ClSOH-Complex to obtain PEMs with IEC of 0.36-0.81 mmol/g and proton conductivity of 0.04-0.065 S/cm. The PEMs with higher MMA content showed higher durability in water (80 
C) and under oxidative conditions (3% H
O) at 60 C. This is because the PMMA grafts in the PEMs have no proton at an 
-carbonyl carbon, which is considered to be a trigger of the degradation of grafting polymers.
Sato, Hisashi; Xiao, J.; Sawada, Atsushi
JAEA-Research 2007-006, 53 Pages, 2007/03
JAEA-Research-2007-006.pdf:6.15MB
It is important to investigate fracture aperture distribution in order to study the influences of heterogeneous aperture distribution onto the fracture hydraulic and mass transport properties. There are several aperture measurement methods, but an optical method has an advantage that measurement resolution is high and tracer movement can be observed. We have developed aperture measurement and tracer movement measuring system by optical method, and have made transparent replica, and measured aperture distribution and tracer concentration distribution. As a result, the optical method was able to confirm the effectiveness of aperture measurement. In addition, the optical method could acquire the tracer concentration distribution which was not disturbed by the influence of heterogeneous aperture distribution.
Xiao, J.; Sato, Hisashi*; Sawada, Atsushi; Takebe, Atsuji*
Proceedings of 4th Asian Rock Mechanics Symposium (ARMS 2006) (CD-ROM), 8 Pages, 2006/11
The heterogeneous void geometries (aperture distribution) in a single fracture have a strong influence on fluid flow process and the solute transport. In order to understand and to predict flow and transport phenomenon through fracture, this paper describes newly developed method for the simultaneous evaluations of fracture aperture, concentration distribution of tracers and fluid velocity in a fracture by means of Light-emitting diode (LED) transmission measurement and Particle Image Velocity (PIV) combine system. It was utilized to accomplish the visualization of flow and solute transport, and to evaluate quantitatively the effect of fracture aperture correlation on temporal flow and transport process through fracture.
Ouchi, Noriyuki; Glazier, J. A.*; Rieu, J.-P*; Upadhyaya, A.*; Sawada, Yasuji*
Physica A, 329(3-4), p.451 - 458, 2003/11
Times Cited Count：78 Percentile：91.18(Physics, Multidisciplinary)Because the extended large-Q Potts model captures effectively the global features of tissue rearrangement experiments, including cell sorting and tissue engulfment, it has become a common technique for cell level simulation of tissues. It agrees qualitatively with experiments. However, standard simulations using positive surface energies fail to describe correctly the dynamics of single cells moving within an aggregate. In particular, the hierarchy of diffusion constants is reversed compared to experiments. The standard model also suffers from numerical instabilities. In this letter, we show how to modify the Hamiltonian using negative surface energies and a spin flip energy threshold to improve the correspondence to experiments. We also investigate diffusion constant dependence on model parameters.
Ando, Toshinari; Hiyama, Tadao; Takahashi, Yoshikazu; Nakajima, Hideo; Kato, Takashi; Isono, Takaaki; Sugimoto, Makoto; Kawano, Katsumi; Koizumi, Norikiyo; Nunoya, Yoshihiko; et al.
IEEE Transactions on Applied Superconductivity, 10(1), p.568 - 571, 2000/03
Times Cited Count：10 Percentile：54.16(Engineering, Electrical & Electronic)no abstracts in English
Mizumoto, Motoharu; Kusano, Joichi; Hasegawa, Kazuo; Ouchi, Nobuo; Oguri, Hidetomo; Ichihara, Masahiro; Tomisawa, Tetsuo; Ito, Takashi; Chishiro, Etsuji*; Ikegami, Masanori*; et al.
KEK Proceedings 99-25, p.3 - 5, 2000/02
no abstracts in English
Ando, Toshinari; Hiyama, Tadao; Takahashi, Yoshikazu; Nakajima, Hideo; Kato, Takashi; Sugimoto, Makoto; Isono, Takaaki; Kawano, Katsumi; Koizumi, Norikiyo; Hamada, Kazuya; et al.
IEEE Transactions on Applied Superconductivity, 9(2), p.628 - 631, 1999/06
Times Cited Count：8 Percentile：52.03(Engineering, Electrical & Electronic)no abstracts in English
Chishiro, Etsuji*; Touchi, Y.*; Kaneko, H.*; Takado, H.*; Sawada, J.*; Kusano, Joichi; Mizumoto, Motoharu
JAERI-Tech 99-020, 56 Pages, 1999/03
no abstracts in English
Maekawa, Yasunari; Hasegawa, Shin; Sawada, Shinichi; Chen, J.; Hashimoto, Naoyuki*; Isobe, Shigehito*
no journal, ,
For establishing a safe and non-electric power type explosion prevention system with hydrogen storage materials, hydrogen permselective membranes against oxygen and water vapor have been developed. Using a radiation-induced grafting method, 4-trimethoxysilylstyrene (STMS) and acrylic acid (AAc) monomers were introduced onto porous poly(vinylidene fluoride) (PVDF) films to obtain STMS- and AAc-grafted PVDF membranes with grafting degrees of 23 and 24%. The STMS- and AAc-grafted PVDF membranes showed permeabilities of hydrogen 8.1 and 12 time higher than those of water vapor. The above results indicated that radiation-grafting of porous films should be very effective method to obtain hydrogen permselective membranes.
Yamazaki, Akiyoshi*; Kamiya, Tomihiro; Sato, Takahiro; Mima, Kunioki*; Fujita, Kazuhisa*; Okuda, Chikaaki*; Sawada, Hiroshi*; Saito, Tsohiya*; Gonzales, R.*; Perlado, J. M.*; et al.
no journal, ,
Maekawa, Yasunari; Hasegawa, Shin; Sawada, Shinichi; Chen, J.; Hashimoto, Naoyuki*; Isobe, Shigehito*
no journal, ,
no abstracts in English
