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Visible light responsive photocatalysts developed by substitution with metal cations aiming at artificial photosynthesis

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Frontiers in Energy 2021年第3期15卷 568-576页

作者： Yuichi YAMAGUCHI akihiko KUDO Department of Applied Chemistry Faculty of ScienceTokyo University of ScienceTokyo 162-8601Japan

To solve resource,energy,and environmental issues,development of sustainable clean energy system is strongly *** recent years,hydrogen has been paid much attention to as a clean *** hydrogen production by water splitting using a photocatalyst as artificial photosynthesis is a promising method to solve these *** utilization of visible light comprised of solar light is essential for practical *** strategies,i.e.,doping,control of valence band,and formation of solid solution are often utilized as the useful methods to develop visible light responsive *** minireview introduces the recent work on visible-light-driven photocatalysts developed by substitution with metal cations of those strategies.

关键词： visible light responsive photocatalyst water splitting artificial photosynthesis:metal ion substitution

Remarks on Herz-Type Hardy Spaces Dedicated to Professor Kozo Yabuta on the occasion of his 60th birthday

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Acta Mathematica Sinica,English Series 2001年第2期17卷 339-360页

作者： akihiko MIYACHI Department of Mathematics Tokyo Woman's Christian University. 2-6-1 Zempukuji. Suginami-ku. Tokyo 167-8585. JAPAN

Basic properties of the Herz-type Hardy spaces HKqa,p, such as the boundedness of singular integral operators and the fractional integration operators, atomic decomposition, dense subspaces, etc., are established in t... 详细信息

关键词： Herz-type Hardy space Singular integral Flactional integration Multilinear operator.

Trigger elimination of polymorphic ventricular tachycardia and ventricular fibrillation by catheter ablation:trigger and substrate modification

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The Journal of Biomedical Research 2015年第1期29卷 44-51页

作者： akihiko Nogami Cardiovascular Division University of Tsukuba

Ventricular fibrillation （VF） is a malignant arrhythmia, usually initiated by a ventricular premature contraction （VPC） during the vulnerable period of cardiac repolarization. Ablation therapy for VF has been described and increasingly reported. Targets for VF triggers are VPCs preceded by Purkinje potentials or from the right ventricular outflow tract （RVOT） in structurally normal hearts, and VPC triggers preceded by Purkinje potentials in ischemic cardiomyopathy. During the session, mapping should be focused on the earliest activation and determining the earliest potential is the key to a successful ablation. However, suppression of VF can be achieved by not only the elimination of triggering VPCs, but also by substrate modification of possible reentry circuits in the Purkinje network, or between the PA and RVOT. The most important issue before the ablation session is the recording of the 12-lead ECG of the triggering event, which can prove invaluable in regionalizing the origin of the triggering VPC for more detailed mapping. In cases where the VPC is not spontaneous or inducible, ablation may be performed by pace mapping. Further studies are needed to evaluate the precise mechanisms of this arrhythmia.

关键词： catheter ablation inherited arrhythmias polymorphic ventricular tachycardia Purkinje network right ventricular outflow tract ventricular fibrillation

Simeprevir with peginterferon and ribavirin induced interstitial pneumonitis:First case report

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World Journal of Gastroenterology 2015年第3期21卷 1009-1013页

作者： Katsuyoshi Tamaki akihiko Okubo Department of Hepatology Tourai-kai Okubo HospitalTokushima 770-0923Japan Department of Respirology Tourai-kai Okubo HospitalTokushima 770-0923Japan

The effectiveness of hepatitis C treatment has improved with the development of interferon(IFN),and it has drastically improved with the development of peg-interferon-α(PEG-IFN) in combination with ribavirin(RBV) and,more recently,with the addition of a protease ***,which is a secondgeneration protease inhibitor,has shown clinically favorable safety and tolerability *** received its first global approval in Japan in September 2013 for the treatment of genotype 1 chronic hepatitis C in combination with PEG-IFN and *** serious adverse event associated with IFN therapy is interstitialpneumonitis,which can be *** experienced a patient with interstitial pneumonitis that was induced by simeprevir with PEG-IFN and RBV therapy for chronic hepatitis C in the early stages of therapy(8 wk after initiating therapy).This is the first case report of interstitial pneumonitis with simeprevir with PEG-IFN and RBV in the *** addition,it is very interesting that the onset of interstitial pneumonitis was earlier than that in conventional PEG-IFN and RBV *** finding suggests that simeprevir augments the adverse *** present this case report in light of relevant literature on interstitial pneumonitis with conventional PEG-IFN and RBV therapy.

关键词： Simeprevir Chronic hepatitis C Interstitial pneumo

Households' Risk Perception and Behavioral Responses to Natech Accidents

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International Journal of Disaster Risk Science 2017年第1期8卷 1-15页

作者： Junlei Yu Ana Maria Cruz akihiko Hokugo School of Humanities and Social Science Nanyang Technological University Disaster Prevention Research Institute Kyoto University Research Center for Urban Safety and Security Kobe University

This study analyzes data on households' risk perception and protective behavior following a natural disaster triggered technological accident(Natech accident)that occurred at an industrial park in Sendai during the Great East Japan Earthquake and Tsunami, on 11 March2011. The results indicate that some households carried out multiple evacuations and that households' risk perceptions changed throughout the Natech accident evacuation process. Risk perception differed according to household location and demographic characteristics. We also found differences in the protective measures adopted for households in different locations. Specifically, those living closer to the Natech accident tended to evacuate immediately,whereas those living further away tended to shelter in place. Wind direction is discussed as a factor that influences households' risk perception and evacuation response to a Natech accident. The findings of this study advance knowledge of household behavior in response to a Natech accident and can assist emergency managers in developing strategies for better management of evacuation processes.

关键词： Evacuation behavior Great East Japan Earthquake and Tsunami Natech accidents Protective actions Risk perception

Carcinogenesis and chemoprevention of biliary tract cancer in pancreaticobiliary maljunction

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World Journal of Gastrointestinal Oncology 2010年第3期2卷 130-135页

作者： akihiko Tsuchida Takao Itoi the third Department of Surgery Tokyo Medical University the fourth Department of Internal Medicine Tokyo Medical University

Pancreaticobiliary maljunction (PBM) is a high risk factor for biliary tract cancer. In PBM, since the pancreatic duct and bile duct converge outside the duodenal wall beyond the influence of the sphincter of Oddi, pancreatic juice and bile are constantly mixed, producing a variety of harmful substances. Because of this, the biliary mucosa is repeatedly damaged and repaired, which causes an acceleration of cell proliferative activity and multiple gene mutations. Histological changes such as hyperplasia, metaplasia, and dysplasia ultimately result in a high incidence of carcinogenesis. In a nationwide survey by the Japanese Study Group on PBM, coexisting biliary tract cancer was detected in 278 of the 1627 registered cases of PBM (17.1%). Of these cases, in those with dilatation of the extrahepatic bile duct, cancer was often detected not only in the gallbladder but also in the bile ducts. More than 90% of cancer cases without dilatation of the extrahepatic bile duct develop in the gallbladder. Standard treatment for PBM is a cholecystectomy and resection of the extrahepatic bile duct. However, cholecystectomy alone is performed at nearly half of institutions in Japan. Conversely, reports of carcinogenesis in the remnant bile duct or pancreas after diversion surgery are steadily increasing. One of the causes for this is believed to be an accumulation of gene mutations which were present before surgery. Anticancer drugs are ineffective in preventing such carcinogenesis following surgery, thus the postoperative administration of chemopreventive agents may be necessary.

关键词： Chemoprevention Gallbladder cancer Bile duct cancer Carcinogenesis Pancreaticobiliary maljunction

Effects of the aluminum concentration on twin boundary motion in pre-strained magnesium alloys

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Journal of Materials Science & Technology 2021年第14期73卷 116-127页

作者： Yujie Cui Kenta Aoyagi Huakang Bian Yuichiro Hayasaka akihiko Chiba Institute for Materials Research Tohoku UniversitySendai 980-8577Japan The Electron Microscopy Center Tohoku UniversitySendai 980-8577Japan

We investigated the effects of Al concentration on the reciprocated motion of twin boundaries in pre-strained Mg-Al-Zn alloys through a combination of applied compression and tension,in-situ electron-backscattering diffraction observations,and high-angle annular dark-field scanning transmission electron microscopy *** twin growth was restricted by increased Al concentration,which resulted in the occurrence of smaller-sized *** reverse motion of twin boundaries was also restricted,resulting in the formation of higher fractions of secondary twins and 2–5°boundaries during reverse *** secondary twins and 2–5°boundaries mainly contributed to the increased ultimate tensile strength of the pre-strained Mg *** effect is more significant in Mg alloys with larger ***,the increased amount of the Al solute atoms,rather than the precipitates,mainly contributed to the increased strengthening effect on the twin boundary *** research contributes to development of high-strength Mg alloys by stabilizing twin boundaries.

关键词： Hexagonal close packed Magnesium alloy Twinning Dislocations Strength Solute atoms

Effect of mechanical ball milling on the electrical and powder bed properties of gas-atomized Ti-48Al-2Cr-2Nb and elucidation of the smoke mechanism in the powder bed fusion electron b eam melting process

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Journal of Materials Science & Technology 2023年第6期137卷 36-55页

作者： Seungkyun Yim Kenta Aoyagi Keiji Yanagihara Huakang Bian akihiko Chiba Institute for Materials Research Tohoku University2-1-1 KatahiraSendaiMiyagi 980-8577Japan

Smoke is unexpected powder-splashing caused by electrostatic force and is one of the main problems hindering the process stability and applicability of the powder bed fusion electron beam(PBF-EB)*** this study,mechanical stimulation was suggested to suppress smoke of gas-atomized(GA)Ti-48Al-2Cr-2Nb powder using Al_(2)O_(3) and WC ball *** deformation mechanism of the GA powder depending on the ball milling media was discussed based on the developed particle morphology distribu-tion map and contact mechanics *** was revealed that the rapid decrement of flowability and packing density after WC ball milling owing to the formation of angular fragments by the brittle *** variation of surface and electrical properties by mechanical stimulation was investigated via XPS,TEM,and Impedance *** electrical resistivity of the ball-milled powders gradually decreased with increasing milling duration,despite the increased oxide film thickness,and the capacitive response disappeared in Al-60 and WC-30 via metal-insulator *** could be due to the accumulation of strain and defects on the oxide film via mechanical *** smoke mechanism of ball-milled powders was discussed based on the percolation *** the smoke experiment,smoke was more suppressed for WC-10 and WC-20 than that for Al-40 and Al-50,respectively,despite the longer charge dissipation *** could be due to the high probability of contact with conductive *** the Al-60 and WC-30 powders,smoke was further restricted by the formation of a percolation cluster with metal-like electrical *** believe that this study will contribute to a better understanding of the smoke mechanism and process optimization of the PBF-EB.

关键词： Metal-insulator transition Electron beam melting additive manufacturing Packing density Flowability Smoke mechanism Percolation theory

Synchrotron X-ray diffraction techniques for in situ measurement of hydride formation under several gigapascals of hydrogen pressure

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Chinese Science Bulletin 2014年第36期59卷 5290-5301页

作者： Hiroyuki Saitoh akihiko Machida Katsutoshi Aoki Quantum Beam Science Directorate Japan Atomic Energy Agency Sayo-cho Sayo-gun Hyogo 679-5148 Japan Institute for Materials Research Tohoku University Aoba-kuSendai 980-8577 Japan

The high-pressure technique is a fundamental tool for realizing novel phase transitions, chemical reactions, and other exotic phenomena. Hydrogenation is one example of a high-pressure reaction; at high pressures of several gigapascals, hydrogen becomes chemically active and reacts with metals and alloys to form hydrides. This paper covers a high-pressure study of the hydrogenation process and the synthesis of hydrides using a cubic-type multi-anvil apparatus. The experimental details of a hydrogenation cell assembly, high-temperature and highpressure generation, and an in situ observation technique are presented. These experiments are conducted with the aid of in situ synchrotron radiation X-ray diffraction measurements operated in an energy-dispersive mode in the conventional manner for time-resolved measurements and a newly developed angle-dispersive mode for observation of the crystal growth process during formation of metal hydrides. Two successful cases of high-pressure hydrogenation are presented: aluminum hydride, Al H3, and an aluminum-based alloy hydride, Al2 Cu Hx, which are potential candidates for hydrogen storage materials.

关键词： X射线衍射技术金属氢化物原位测量氢气压力同步加速器同步辐射X射线衍射高压技术晶体生长过程