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Advances in polymer-stabilized Au nano-cluster catalysis : Interplay of theoretical calculations and experiments

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Chinese Journal of Catalysis 2016年第10期37卷 1588-1593页

作者： Hiroaki Koga Yoshinori Ato Akihide Hayashi Kohei tada Mitsutaka Okumura 京都大学催化剂与电池元素战略研究基地大阪大学科学研究院化学系

Polymer‐stabilized Au nano clusters （NCs） with mean diameters of 2–10 nm exhibit unique catalytic properties. Several studies have shown that the key factors affecting the catalytic activity of poly‐mer‐stabilized Au NCs are control of the Au NC size, appropriate selection of polymers and optimi‐zation of the reaction conditions. This is because polymer‐stabilized Au NCs exhibit a clear size effect in several catalytic reactions, and the catalytic activity differs with the type of polymer used and the reaction conditions. In order to elucidate the reason underlying the catalytic activity of the polymer‐stabilized Au NCs, much attention is being devoted to the interplay of theoretical calcula‐tions and experiments in catalysis by polymer stabilized Au NCs. The present article mainly summa‐rizes our progress in understanding this interplay in polymer‐stabilized Au NC catalysis.

关键词： Polymer-stabilized Au nano-clusterAerobic oxidation of alcoholsInterplay of theoretical calculations and experimentsSize effect ofAu nano-clusterRole of the polymers

Risk prediction of common bile duct stone recurrence based on new common bile duct morphological subtypes

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World Journal of Gastrointestinal Surgery 2022年第8期14卷 874-876页

作者： Hirokazu Saito Shuji tada Department of Gastroenterology Kumamoto City HospitalKumamoto 862-8505Japan

Stones in the common bile duct(CBD) are reported worldwide, and this condition is majorly managed through endoscopic retrograde cholangiopancreatography(ERCP). CBD stone recurrence is an important issue after endoscopic stone removal. Therefore, it is essential to identify its risk factors to determine the necessity of regular follow-up in patients who underwent endoscopic removal of CBD stones. The authors identified that the S and polyline morphological subtypes of CBD were associated with increased stone recurrence. New morphological subtypes of CBD presented by the authors can be important risk predictors of recurrence after endoscopic stone removal. Furthermore, the new morphological subtypes of CBD may predict the risk of residual CBD stones or technical difficulty in CBD stone removal. Further studies with a large sample size and longer follow-up durations are warranted to examine the usefulness of the newly identified morphological subtypes of CBD in predicting the outcomes of ERCP for CBD stone removal.

关键词： Endoscopic retrograde cholangiopancreatography Common bile duct stone Stone removal Recurrence Common bile duct morphology Risk prediction

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Rubber–ice friction

Friction 2023年第8期11卷 1534-1543页

作者： Toshi tada Satoshi KAWASAKI Ryouske SHIMIZU Bo N.J.PERSSON Sumitomo Rubber Industries Ltd.Material Research&Development HQ.2-1-1Kobe 651-0071Japan Peter Grünberg Institute(PGI-1) Forschungszentrum JülichJülich 52425Germany MultiscaleConsulting Jülich 52428Germany

We study the friction when a rectangular tire tread rubber block is sliding on an ice surface at different temperatures ranging from−38 to−2℃,and sliding speeds ranging from 3μm/s to 1 cm/*** low temperatures and low sliding speeds we propose that an important contribution to the friction force is due to slip between the ice surface and ice fragments attached to the rubber *** temperatures above−10℃ or for high enough sliding speeds,a thin premelted water film occurs on the ice surface and the contribution to the friction from shearing the area of real contact is *** this case the dominant contribution to the friction force comes from viscoelastic deformations of the rubber by the ice *** comment on the role of waxing on the friction between skis and snow(ice particles).

关键词： ice friction rubber friction ice premelting

High-Performance Optical Modulators Based on Potential- Tailored Quantum Wells

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光学学报 2003年第S1期23卷 335-336页

作者： Kunio tada Taro Arakawa Graduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 JapanGraduate School of Engineering Yokohama National University 79-5 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan

The five -layer asymmetric coupled quantum well ( FACQW) , which is one of the potential -tailored quantum wells, is expected to show very large electrorefrac live index cha nge in a wideband transpar ency region far from the absorption edge. Characteristics of the FACQW and its application to compact, ultrafast , low voltage optical modul ators and switches are dis cussed.

关键词： InGaAs as that Tailored Quantum Wells High-Performance Optical Modulators Based on Potential very be length with have of in for

Peginterferon and ribavirin treatment for hepatitis C virus infection

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World Journal of Gastroenterology 2011年第4期17卷 419-432页

作者： Akihito Tsubota Kiyotaka Fujise Yoshihisa Namiki Norio tada Institute of Clinical Medicine and Research Jikei University School of Medicine

Pegylated interferon α (IFNα) in combination with ribavirin is currently recommended as a standard-of-care treatment for chronic hepatitis C virus (HCV) infection. This combination therapy has drastically improved the rate of sustained virological response, specifically in difficult-to-treat patients. Recently, individualized treatment, such as response-guided therapy, is being developed based on host-, HCV- and treatment-related factors. Furthermore, modified regimens with currently available medications, novel modified IFNα and ribavirin or combinations with specifically targeted antiviral therapy for HCV agents, are currently being investigated. The purpose of this review is to address some issues and epoch-making topics in the treatment of chronic HCV infection, and to discuss more optimal and highly individualized therapeutic strategies for HCV-infected patients.

关键词： Pegylated interferon α Ribavirin Chronic hepatitis C virus infection Difficult-to-treat patient Individualized treatment Response-guided therapy Specifically targeted antiviral therapy for hepatitis C virus

MICRO-MACRO DAMAGE SIMULATION OF LOW-ALLOY STEEL WELDS SUBJECT TO TYPE IV CREEP FAILURE

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Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 393-399页

作者： T.Igari F.Kawashima T.Tokiyoshi N.tada Nagasaki R&D Center Mitsubishi Heavy Industries Ltd. Nagasaki 851-0392 JapanNagasaki R&D Center Mitsubishi Heavy Industries Ltd. Nagasaki 851-0392 JapanNagasaki R&D Center Mitsubishi Heavy Industries Ltd. Nagasaki 851-0392 JapanFaculty of Engineering Okayama University Okayama 700-8530 Japan

A simulation method for microscopic creep damage at grain boundaries in the fine-grain heat-affected zone of low-alloy steel welds involving high energy piping was proposed on the basis of the combination of elastic-creep FEM (finite element method) analysis and random fracture resistance modeling of the materials. The procedure to determine the initiation and growth-driving forces of small defects were briefly described. Then, a simulation procedure combining the stress distribution from elastic-creep FEM and the random fracture resistance model was proposed, and Ms procedure was applied to the simulation of the microscopic damage progress in a welded joint model test and in actual power piping. The results in terms of the simulated number density of small defects throughout the wall thickness were in good agreement with the observed results.

关键词： Type IV creep damage welding 2.25Cr-lMo steel high-energy piping numerical simulation small defect

EVOLUTION OF CREEP-FATIGUE DAMAGE IN TYPE 304STAINLESS STEEL AND ITS DETECTION BY ELECTRICALPOTENTIAL METHOD

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Acta Metallurgica Sinica(English Letters) 1998年第6期11卷 463-469页

作者： N.tada T.Kitamura R.Ohtani E.Nakayama Kyoto Univ Kyoto Japan

Creep-fatigue test was carried out using smooth round bar specimens of Type 304 stainless steel. Cavities and small cracks on the cross-section of the specimen were carefully observed by a scanning laser microscope. Moreover, direct current electrical potential method (DC-EPM) was applied in order to evaluate non-destructively the distribution of internal cracks. The distribution evaluated by DC-EPM agrees well with the actual one. (Edited author abstract) 9 Refs.

关键词： creep-fatigue cavity small crack Type 304 stainless steel electrical potential method

Crystal and electronic structure engineering of tin monoxide by external pressure

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Journal of Advanced Ceramics 2021年第3期10卷 565-577页

作者： Kun LI Junjie WANG Vladislav ABLATOV Yutong GONG NaotoUMEZAWA Tomofumi tada Hideo HOSONO Artem ROGANOV State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China International Center for Materials Discovery School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Samara Center for Theoretical Materials Science(SCTMS) Samara State Technical UniversitySamara 443100Russia Samara Center for Theoretical Materials Science(SCTMS) Samara UniversitySamara 443011Russia Semiconductor R&D Center Samsung ElectronicsGyeonggi-do 18448Republic of Korea Materials Research Center for Element Strategy Tokyo Institute of TechnologyKanagawa 226-8503Japan Skolkovo Institute of Science and Technology Moscow 143026Russia Moscow Institute of Physics and Technology Dolgoprudny 141700Russia

Although tin monoxide (SnO) is an interesting compound due to its p-type conductivity,a widespread application of SnO has been limited by its narrow band gap of 0.7 *** this work,we theoretically investigate the structural and electronic properties of several SnO phases under high pressures through employing van der Waals (vdW) *** calculations reveal that a metastable SnO (β-SnO),which possesses space group P2_(1)/c and a wide band gap of 1.9 eV,is more stable than α-SnO at pressures higher than 80 ***,a stable (space group P2/c) and a metastable (space group Pnma) phases of SnO appear at pressures higher than 120 *** and topological analyses show that P2/c-SnO has a high possibility to directly transform to β-SnO at around 120 *** work also reveals that β-SnO is a necessary intermediate state between high-pressure phase Pnma-SnO and low-pressure phase α-SnO for the phase transition path Pnma-SnO →β-SnO →α-*** phase transition analyses indicate that there is a high possibility to synthesize β-SnO under high-pressure conditions and have it remain stable under normal ***,our study reveals that the conductive property of β-SnO can be engineered in a low-pressure range (0-9 GPa)through a semiconductor-to-metal transition,while maintaining transparency in the visible light range.

关键词： tin monoxide van der Waals(vdW) topological relationship phase transition band gap

On-treatment predictions of success in peg-interferon/ribavirin treatment using a novel formula

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World Journal of Gastroenterology 2010年第1期16卷 89-97页

作者： Hidetsugu Saito Hirotoshi Ebinuma Keisuke Ojiro Kanji Wakabayashi Mika Inoue Shinichiro tada Toshifumi Hibi Department of Internal Medicine School of MedicineKeio University

AIM:To predict treatment success using only simple clinical data from peg-interferon plus ribavirin therapy for chronic hepatitis C. METHODS:We analyzed the clinical data of 176 patients with chronic hepatitis and hepatitis C virus genotype 1 who received 48 wk standard therapy, derived a predictive formula to assess a sustained virological response of the individual patient using a logistic regression model and confirmed the validity of this *** formula was constructed using data from the first 100 patients enrolled and validated using data from the remaining 76 patients. RESULTS:Sustained virological response was obtained in 83(47.2%)of the patients and we derived formulae to predict sustained virological response at pretreatment and weeks 4,12 and *** likelihood of sustained virological response could be predicted effectively bythe formulae at weeks 4,12 and 24(the area under the curve of the receiver operating characteristic:0.821, 0.802,and 0.891,respectively),but not at baseline (0.570).The formula at week 48 was also constructed and validation by test data achieved good prediction with 0.871 of the area under the curve of the receiver operating *** by this formula was always superior to that by viral kinetics. CONCLUSION:These results suggested that our formula combined with viral kinetics provides a clear direction of therapy for each patient and enables the best tailored treatment.

关键词： Logistic regression analysis Predictive formula Prolongation of the therapy Response-guided therapy Viral kinetics