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FY2015

Date:2015/5/29

The paper of Dr. Yo Tokunaga (Advanced Science Research Center), et al. was selected as a "Editors' Suggestion"of Physical Review Letters.

Reentrant superconductivity has been discovered under strong magnetic fields in a uranium based heavy fermion compound URhGe. In this study, we have succeeded to reveal the mechanism of this unconventional behavior of superconductivity by using nuclear magnetic resonance (NMR) technique. We can expect future applications of the mechanism to develop new superconducting devices working under strong magnetic fields.
This paper was selected a "Editors' Suggestion" of Physical Review Letters.
Research CenterAdvanced Science Research Center
AuthorsYo Tokunaga
JournalPhysical Review Letters
Paper's info.http://dx.doi.org/10.1103/PhysRevLett.114.216401
Journal's info.http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.216401#fulltext#fulltext
Date:2016/1/1

The paper of Dr. Mamoru Matsuo (Advanced Science Research Center), et al. got featured in News&Views of Nature Physics and Nature Materials.

Electrical generation from quantum mechanical spinning motion in a liquid metalThe team found a new method of power generation by using electron spinning motion in a liquid metal via the quantum mechanical coupling between electron and fluid vorticity. The result can be used as an electric generator and a spin generator in, e.g., microelectromechanical system free from magnetic fields.
The paper was featured in News&Views of Nature Physics and Nature Materials.
Research CenterAdvanced Science Research Center
AuthorsMamoru Matsuo
JournalNature Physics
Paper's info.http://dx.doi.org/10.1038/NPHYS3526
Journal's info.http://www.nature.com/nphys/journal/vaop/ncurrent/full/nphys3572.html
http://www.nature.com/nmat/journal/v14/n12/full/nmat4499.html
Date:2015/11/5

The paper of Dr. Kuniyoshi Takamatsu (HTGR Hydrogen and Heat Application Research Center) was selected as a "a Key Scientific Article contributing to excellence in engineering, scientific and industrial research" of Advances in Engineering.

After Fukushima Daiichi nuclear disaster by Tokyo Electric Power Company, a cooling system to prevent core damage became more important from the perspective of defense in depth. Therefore, a new, highly efficient reactor cavity cooling system (RCCS) with passive safety features without a requirement for electricity and mechanical drive is proposed. Employing the air as the working fluid and the ambient air as the ultimate heat sink, the new RCCS design strongly reduces the possibility of losing the heat sink for decay heat removal. The RCCS can always stably and passively remove a part of the released heat at the rated operation and the decay heat after reactor shutdown. Specifically, emergency power generators are not necessary and the decay heat can be passively removed for a long time, even forever if the heat removal capacity of the RCCS is sufficient.
This paper was selected a "a Key Scientific Article contributing to excellence in engineering, scientific and industrial research" of Advances in Engineering.
Research CenterHTGR Hydrogen and Heat Application Research Center
AuthorsKuniyoshi Takamatsu
JournalAnnals of Nuclear Energy
Paper's info.http://dx.doi.org/10.1016/j.anucene.2014.11.011
Journal's info.https://advanceseng.com/general-engineering/new-reactor-cavity-cooling-system-having-passive-safety-features-using-novel-shape-for-htgrs-and-vhtrs/
Date:2015/8/27

The paper of Drs. Hiroshi Suzuki (Quantum Beam Science Center), Stefanus Harjo (J-PARC Center), et al. was selected as a "a Key Scientific Article contributing to excellence in engineering, scientific and industrial research" of Advances in Engineering.

In modern society, architectural and civil engineering structures such as reinforced concrete buildings require high seismic performance to minimize the ‘megarisk’ exposed from urban earthquake hazards. In the reinforced concrete structures, the bond resistance between rebar and concrete is one important parameter for discussing its performance and it has been typically evaluated by measuring the strain distribution along the embedded rebar. Here, we present in-situ strain and stress measurements for the rebar in reinforced concrete using time-of-flight neutron diffraction as a novel alternative technique to typical strain gauges. It was demonstrated in this study that the three-dimensional deformation behavior of the embedded rebar in normal-strength concrete, cured in air, can be accurately measured under pull-out loading using time-of-flight neutron diffraction. Wider applications of neutron diffraction in the structural engineering field are expected for advanced understanding of actual phenomena on reinforced concrete structures.
This paper was selected a "a Key Scientific Article contributing to excellence in engineering, scientific and industrial research" of Advances in Engineering.
Research CenterQuantum Beam Science Center, J-PARC Center
AuthorsHiroshi Suzuki, Stefanus Harjo
JournalMeasurement Science and Technology
Paper's info.http://dx.doi.org/10.1088/0957-0233/25/2/025602
Journal's info.https://advanceseng.com/civil-engineering/measuring-strain-stress-distributions-along-rebar-embedded-concrete-using-time-flight-neutron-diffraction/
Date:2015/5/1

The paper of Drs. Shigeyoshi Otosaka (Nuclear Science and Engineering Research Center), Yoshihisa Katob (Tokai University) was selected as a “2014 Hot Articles” of Environmental Science: Processes & Impacts (RSC).

Primary processes of accident-derived radiocesium in seabed sediments off Fukushima were inferred from results of oceanographic observations about 6 months after the accident of Fukushima Daiichi Nuclear Power Plant. Findings of this paper contains useful information for review of monitoring program off Fukushima as well as for development of simulation models that predict behavior of radionuclides near the seafloor.
This paper was selected as a "2014 Hot Articles" of Environmental Science: Processes & Impacts (RSC).
Research CenterNuclear Science and Engineering Center
AuthorsShigeyoshi Otosaka, Yoshihisa Kato
JournalEnvironmental Science: Processes & Impacts
Paper's info.http://pubs.rsc.org/en/journals/articlecollectionlanding?sercode=em&themeid=83a62fdb-a418-4042-86ee-b1b99bfde7bf
Journal's info.http://pubs.rsc.org/en/journals/articlecollectionlanding?sercode=em&themeid=83a62fdb-a418-4042-86ee-b1b99bfde7bf

FY2014

Date:2015/3/5

The paper of Dr. Hiroyuki Koura (Advanced Science Research Center) was selected as 'Highlight of 2014' of Physics Education (IOP).

We constructed three-dimensional nuclear charts out of toy blocks as an extension of ordinary paper-based nuclear chart, and proposed to use them in physics education. This model has some types as atomic masses per nucleon, half-lives, isotopic abundances, and so on. Activities using the model have been well-received by the general public as science cafes by high school students as science lectures.
This paper was selected as 'Highlight of 2014' of Physics Education (IOP) in papers published in 2014.
Research CenterAdvanced Science Research Center
AuthorsHiroyuki Koura
JournalPhysical Education
Paper's info.http://dx.doi.org/10.1088/0031-9120/49/2/215
Journal's info.http://iopscience.iop.org/0031-9120/page/Highlights-of-2014-collection
Date:2015/1/20

The paper of Drs. Shinsaku Kambe, Yo Tokunaga, Hironori Sakai (Advanced Science Research Center), et al. was selected as Editor’s suggestion of Physical review B.

Identification of hidden ordered state in URu2Si2 is one of important issues in the modern condensed matter physics. In the present study, the distribution of 4-fold symmetry breaking in the hidden ordered state is clarified for the first time using NMR.
This paper was selected as Editor’s suggestion of Physical review B.
Research CenterAdvanced Science Research Center
AuthorsShinsaku Kambe, Yo Tokunaga, Hironori Sakai
JournalPhysical Review B
Paper's info.http://dx.doi.org/10.1103/PhysRevB.91.035111
Journal's info.http://journals.aps.org/prb/highlights
Date:2014/9/26

The paper of Drs. Akihiko Machida, Hiroyuki Saito (Quantum Beam Science Center), Takanori Hattori (J-PARC Center), et al. was selected as a feature article in Japanese web site of Nature Commnications.

Hydrogen composition and occupation state provide basic information for understanding various properties of the metal?hydrogen system, ranging from microscopic properties such as hydrogen diffusion to macroscopic properties such as phase stability. Here the deuterization process of face-centred cubic Fe to form solid-solution face-centred cubic FeDx is investigated using in situ neutron diffraction at high temperature and pressure. The results showed the hydrogen occupies the tetrahedral crystallographic site in Fe under high pressure and temperature condition, contrary to the previous knowledge. The occupation state of D atoms in Fe metal provides an insight into the various properties of metal? hydrogen/deuterium systems such as H/D atom diffusion and phase stability of hydrides/deuterides.
This paper was selected as a feature article in Japanese web site of Nature Commnications.
Research CenterQuantum Beam Science Center, J-PARC Center
AuthorsAkihiko Machida, Hiroyuki Saito, Takanori Hattori
JournalApplied Physics Express
Paper's info.http://dx.doi.org/10.1038/ncomms6063
Journal's info.http://www.natureasia.com/ja-jp/ncomms/abstracts/58208
Date:2014/6/30

The paper of Drs. Sadamichi Maekawa, Hiroyuki Chudo, Mamoru Matsuo, et al. (Advanced Science Research Center) was selected as a Spotlight in Applied Physics Express.

We have developed a new analyzing method for a nuclear spin state in a rotating object with a rotation speed up to 10,000 Hz by uniquely improfving a conventional NMR method. With this method, we suceeded in directly observing the effect of high speed rotation on a spin of an elementary particle. The reserach for controling a spin by mechanical motion is expected to make progress on the research field of nano-mechanics in the future.
This paper was selected as a Spotlight in Applied Physics Express.
Research CenterAdvanced Science Research Center
AuthorsSadamichi Maekawa, Hiroyuki Chudo, Mamoru Matsuo
JournalApplied Physics Express
Paper's info.http://dx.doi.org/10.7567/APEX.7.063004
Journal's info.http://iopscience.iop.org/1882-0786/page/Spotlights

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