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Strong Enhancement of Superconductivity in Inorganic Electride 12CaO·7Al2O3:e− under High Pressure
Shigeki Tanaka,Tomoki Kato,Atsushi Miyake,Tomoko Kagayama,Katsuya Shimizu,Sung Wng Ki,Satoru Matsuishi,Hideo Hosono 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We present the results of the pressure dependence of the superconductivity of the inorganicelectride 12CaO·7Al2O3:e− (C12A7:e−) single crystal through the ac-susceptibility measurementunder high pressure. C12A7:e− has the cage structure and the density of states derived fromthe cages may play an important role in the superconductivity. The superconducting transitiontemperature (Tc) is 0.2 K at ambient pressure and monotonically increases up to 1.79 K at4.7 GPa. The upper critical field Hc2 and −dHc2/dT at Tc, in proportion to the density of states(DOS) at Fermi energy becomes larger under high pressure. The superconductivity in C12A7:e− ismediated by the electron-phonon interaction, and the increase of Tc with pressure may arise froma peak structure of the DOS of cage conduction band.
Effect of TiC Content on Oxidation Behavior of Sintered WC-TiC-TaC Alloys
Tanaka Hiroki,Mouri Shigeki,Nakahara Kenji,Sano Hideaki,Zheng Guo Bin,Uchiyama Yasuo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
The effect of TiC content on oxidation behavior of the sintered WC-TiC-TaC alloys with 2 mass% TaC and different TiC amounts of 3-45 mass% was investigated through oxidation tests in air at 973K. As a result of the tests, it was revealed that with increasing TiC content in the alloys, mass changes caused by oxidation and thickness of the scale decreased. Thus, it is considered that the main component of the scales changed gradually from to with increasing TiC content in the alloys, and oxygen diffusion through the scale to the alloys was inhibited gradually.
Tanaka, Yasuo,Saito, Shohei,Mori, Shigeki,Aratani, Naoki,Shinokubo, Hiroshi,Shibata, Naoki,Higuchi, Yoshiki,Yoon, Zin Seok,Kim, Kil Suk,Noh, Su Bum,Park, Jong Kang,Kim, Dongho,Osuka, Atsuhiro WILEY-VCH Verlag 2008 Angewandte Chemie Vol.47 No.4
<B>Graphic Abstract</B> <P>Round the twist: Metalation of [36]octaphyrin 1 provided the Möbius aromatic Pd<SUB>2</SUB> complex 3 as well as the Hückel antiaromatic Pd<SUB>2</SUB> complex 2. This method can be applied to other expanded porphyrins and Group 10 metal ions. The aromatic/antiaromatic character was supported by NMR spectrscopy, NICS calculation, and two-photon absorption measurements. <img src='wiley_img/14337851-2008-47-4-ANIE200704407-content.gif' alt='wiley_img/14337851-2008-47-4-ANIE200704407-content'> </P>
Hattori, Shigeki,Kano, Shinya,Azuma, Yasuo,Tanaka, Daisuke,Sakamoto, Masanori,Teranishi, Toshiharu,Majima, Yutaka IOP Pub 2012 Nanotechnology Vol.23 No.18
<P>Coulomb blockade behaviors in individual Au nanoparticles of 2 nm core diameter in double-barrier structures have been studied by means of noncontact atomic force spectroscopy (NC-AFS) at room temperature. The Au nanoparticles with a 1-decanethiol ligand were chemisorbed by 1,10-decanedithiol molecules of a mixed 1-octanethiol/1,10-decanedithiol self-assembled monolayer coated on a Au(111) surface; these particles were observed through NC-AFS. NC-AFS measurements of the cantilever frequency shift–sample voltage (&Dgr;f–V<SUB>S</SUB>) curves were sequentially conducted on three Au nanoparticles under the same experimental conditions; the &Dgr;f–V<SUB>S</SUB> curves were found to deviate from the parabolic (&Dgr;f<SUB>N</SUB>) curve in the cases where no extra charge existed on the Au core. The experimental &Dgr;f<SUB>CB</SUB>(=&Dgr;f − &Dgr;f<SUB>N</SUB>) and &Dgr;f<SUB>CB</SUB>/V curves agree well with the theoretical curves obtained using a golden-rule calculation and the same parabolic parameters. All the results, through NC-AFS, suggest Coulomb blockade behaviors in the Au nanoparticles at room temperature.</P>
Suzuki, Yushi,Tanaka, Ichiro,Sakai, Shigeki,Yamauchi, Tomohiro Korean Society of Plastic and Reconstructive Surge 2021 Archives of Plastic Surgery Vol.48 No.2
Background There are currently no guidelines for the postoperative wound management of the hard-palate donor site in cases involving mucosal harvesting. This study describes our experiences with the use of an artificial dermis for early epithelialization and transparent plate fixation in cases involving hard-palate mucosal harvesting. Methods A transparent palatal plate was custom-fabricated using a thermoplastic resin board. After mucosal harvesting, an alginic acid-containing wound dressing (Sorbsan) was applied to the donor site, which was then covered with the plate. After confirming hemostasis, the dressing was changed to artificial dermis a few days later, and the plate was fixed to the artificial dermis. The size of the mucosal defect ranged from 8×25 to 20×40 mm. Results Plate fixation was adequate, with no postoperative slippage or infection of the artificial dermis. There was no pain at the harvest site, but a slight sense of incongruity during eating was reported. Although the fabrication and application of the palatal plate required extra steps before and after harvesting, the combination of the artificial dermis and palatal plate was found to be very useful for protecting the mucosal harvest site, and resulted in decreased pain and earlier epithelialization. Conclusions The combination of artificial dermis and a transparent palatal plate for wound management at the hard-palate mucosal donor site resolved some of the limitations of conventional methods.
The Change of Walking by Improvement of Ankle Joint Excursion
JooHyun Ham,Tamae Tanaka,Shigeki Yamabe 보완대체의학연구소 2014 Research Journal of Complementary and Alternative Vol.- No.5
A number of studies have been reported examining walking mechanisms, however the relationship between a walking mechanism (gait) and the presence of a deformed talus has not been fully elucidated. Therefore, we conducted this study focusing on understanding the causal relationship between talus deformity and gait with reference to the description on the decrease of the driving force component in ground reaction force in “Limited Range of Joint Motion: Mechanism and Treatment" by Minoru Okita et al. The result of our study demonstrated that a deformed talus caused the following changes: first, it led to turning of the knee/ankle joint which was caused by displacement of the ground reaction force movement locus from the ankle to the toe on the sole of the foot. Second, it reduced the step length by decreasing the ankle joint excursion in plantar flexion and dorsiflexion, by increasing ground reaction force when walking, and by the decrease of the driving force for toe off in the stance phase of walking. Moreover, it is possible to say that the study conducting with subjects including those who have pain in ankles and knees would clarify the relationship between the talus and walking mechanism in detail.
( Shinichiro Shinzaki ),( Toshimitsu Fujii ),( Shigeki Bamba ),( Maiko Ogawa ),( Taku Kobayashi ),( Masahide Oshita ),( Hiroki Tanaka ),( Keiji Ozeki ),( Sakuma Takahashi ),( Hiroki Kitamoto ),( Kazuh 대한장연구학회 2018 Intestinal Research Vol.16 No.4
Background/Aims: The influences of Helicobacter pylori eradication therapy on the disease course of inflammatory bowel disease (IBD) are still unclear. We therefore conducted a multicenter, retrospective cohort study to evaluate the safety of H. pylori eradication therapy for IBD patients. Methods: IBD patients with H. pylori eradication from 2005 to 2015 (eradication group) and control patients (non-eradication group; 2 paired IBD patients without H. pylori eradication matched with each eradicated patient) were included. IBD exacerbation (increased/additional IBD drug or IBD-associated hospitalization/surgery) and disease improvement based on the physicians’ global assessment were investigated at baseline, and at 2 and 6 months after eradication or observation. Results: A total of 429 IBD (378 ulcerative colitis, 51 Crohn’s disease) patients, comprising 144 patients in the eradication group and 285 patients in the non-eradication group, were enrolled at 25 institutions. IBD exacerbation was comparable between groups (eradication group: 8.3% at 2 months [odds ratio, 1.76; 95% confidence interval, 0.78-3.92; P=0.170], 11.8% at 6 months [odds ratio, 1.60; 95% confidence interval, 0.81-3.11; P=0.172]). Based on the physicians’ global assessment at 2 months, none of the patients in the eradication group improved, whereas 3.2% of the patients in the non-eradication group improved (P =0.019). Multivariate analysis revealed that active disease at baseline, but not H. pylori eradication, was an independent factor for IBD exacerbation during 2 months’ observation period. The overall eradication rate was 84.0%-comparable to previous reports in non-IBD patients. Conclusions: H. pylori eradication therapy does not alter the short-term disease activity of IBD. (Intest Res 2018;16:609-618)
Diprotonated [28]Hexaphyrins(1.1.1.1.1.1): Triangular Antiaromatic Macrocycles
Ishida, Shin‐,ichiro,Higashino, Tomohiro,Mori, Shigeki,Mori, Hirotaka,Aratani, Naoki,Tanaka, Takayuki,Lim, Jong Min,Kim, Dongho,Osuka, Atsuhiro WILEY‐VCH Verlag 2014 Angewandte Chemie Vol.126 No.13
<P><B>Abstract</B></P><P>Protonation of <I>meso</I>‐aryl [28]hexaphyrins(1.1.1.1.1.1) triggered conformational changes. Whereas protonation with trifluoroacetic acid led to the formation of monoprotonated Möbius aromatic species, protonation with methanesulfonic acid led to the formation of diprotonated triangular antiaromatic species. A peripherally hexaphenylated [28]hexaphyrin was rationally designed and prepared to undergo diprotonation to favorably afford a triangular‐shaped antiaromatic species.</P>