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Ho-doping Effect on the Incommensurate Magnetic Order in La1.88Sr0.12CuO4
Masaki Fujita,Masanori Enoki,Kenji Tsutsumi,Satoshi Iikubo,Kazuyoshi Yamada 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have performed elastic neutron scattering experiments on the superconductorLa1.85Ho0.03Sr0.12CuO4 to study the effect of substitution of a cation with a large magnetic momentat La site on the static spin correlation. In the Ho-free sample with a hole concentration of 0.12,the spatially-modulated magnetic order is known to be stabilized at temperature below Tspin 30K. In the present Ho-doped sample, we found the appearance of magnetic peaks at (0.5, 0.5 ± 0.119, 0) positions below Tspin 35 K, which is similar to the observation in the pristine sample. Furthermore, the volume-corrected intensities in the Ho-free and Ho-doped samples are comparable,suggesting a negligible effect of Ho-substitution at La sites. These results are quite a contrast tothe huge enhancement of the magnetic intensity and the increase of Tspin by substituting a comparableamounts of magnetic Fe3+ ions onto CuO2 planes. Therefore, the stability of the stripe orderinduced by the cation substitution is sensitive to the site at which the substitution occurs.
( Ryuichi Nakamura ),( Kenji Fujita ),( Rei Omi ),( Kazunari Kuroda ),( Masaki Takahashi ),( Kazumi Ikebuchi ),( Hitoshi Nishimura ),( Yasuo Katsuki ) 대한슬관절학회 2017 대한슬관절학회지 Vol.29 No.3
Since distal femoral varus osteotomy (DFO) -specific plates had not been available in Japan before 2015, we performed DFO using a plate for tibia. The purpose of this study was to elucidate the efficacy and problems associated with the non-specific plate in DFO. We used NCB-PT plates (Zimmer Inc.) in the upside-down position and the minimum 5-year outcomes were evaluated. The mean preoperative weight bearing line ratio and Japanese Orthopaedic Association score improved from 97.6%±35.8% and 68.0±11.5, respectively, to 44.0%±16.1% and 82.0±7.6, respectively, 1 year postoperatively and to 42.8%±15.7% and 86.0±8.2, respectively, 5 years postoperatively. The flexion range decreased from 149.0°±6.5° to 138.0°±5.7° 1 year postoperatively and to 135.0°±20.9° 5 years postoperatively. Although DFO using the NCB-PT plate provided mid-term benefits, it resulted in a loss of knee flexion, possibly due to excessive coverage of the medial femoral epicondyle.
Subnanometer Vacancy Defects Introduced on Graphene by Oxygen Gas
Yamada, Yasuhiro,Murota, Kazumasa,Fujita, Ryo,Kim, Jungpil,Watanabe, Ayuko,Nakamura, Masashi,Sato, Satoshi,Hata, Kenji,Ercius, Peter,Ciston, Jim,Song, Cheng Yu,Kim, Kwanpyo,Regan, William,Gannett, Wil American Chemical Society 2014 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.136 No.6
<P>The basal plane of graphene has been known to be less reactive than the edges, but some studies observed vacancies in the basal plane after reaction with oxygen gas. Observation of these vacancies has typically been limited to nanometer-scale resolution using microscopic techniques. This work demonstrates the introduction and observation of subnanometer vacancies in the basal plane of graphene by heat treatment in a flow of oxygen gas at low temperature such as 533 K or lower. High-resolution transmission electron microscopy was used to directly observe vacancy structures, which were compared with image simulations. These proposed structures contain CO, pyran-like ether, and lactone-like groups.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2014/jacsat.2014.136.issue-6/ja4117268/production/images/medium/ja-2013-117268_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja4117268'>ACS Electronic Supporting Info</A></P>
Structural and Magnetic Properties of Antiferromagnetic Heusler Ru2MnGe Epitaxial Thin Films
Naoto Fukatani,Hirohito Fujita,Tetsuya Miyawaki,Kenji Ueda,Hidefumi Asano 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Structural and magnetic properties were investigated for Heusler-type alloy Ru2MnGe thin films. Ru2MnGe films on MgO substrate were subjected to an in-plane compressive strain, and exhibitedenhanced antiferromagnetic (AFM) transition temperature (TN) up to 353 K, which exceeds by 37K from the cubic bulk material (TN = 316 K). We also observed the exchange coupling betweenRu2MnGe and Heusler-type ferromagnetic (FM) half-metal Fe2CrSi thin films. The present AFMHeusler alloy with relatively high TN is useful to fabricate high-quality all Heusler-type half-metalAFM/FM junctions and is a promising material for the emerging field of AFM spintronics.
김형수,등전현이 대한상하수도학회 1995 상하수도학회지 Vol.9 No.3
A Study on the fouling Control by periodical ozone-Scrubbing was conducted in a membrane filtration process for drinking water treatment. Hydrophilic hollow fiber polyethylene membrane with pore size of 0.1㎛ and its surface area of 0.42㎡ was used. Dead-End filtration method was selected to obtain high efficiency of energy. Laboratory prepared synthetic raw water with kaolin was used and the membranes were scrubbed by ozone once in an hour and once in two hours. When the duration of ozone scrubbing was increased from 10 seconds to 20seconds, the rate of membrane fouling was significantly decreased. Although the frequency of ozone-scrubbing was reduced from once in an hour to once in two hours, the effect of fouling control was unchanged, However, ozone-scrubbing was not effective after a membrane was fouled and washed with detergent for reuse. Among several possible working effects of ozone, bactericidal effect was confirmed to be the primary reason of fouling control.