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Minimization of Reactive Power Fluctuation in JT-60SA Magnet Power Supply

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Plasma Science and Technology 2013年第2期15卷 184-187页

作者： K. SHIMADA T. TERAKADO K. yamauchi M. MATSUKAWA O. BAULAIGUE R. COLETTI A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan CEA IRFMF-13108 Saint-Paul-Lez-Durance France ENEA 1-00044 Frascati Rome Italy Fusion for Energy Boltzmannstr 2Garching 85748 Germany

This paper describes an asymmetric control method for the firing angle and a start/stop timing shift control of four thyristor converters called ＂Booster PS＂ to minimize the reactive power fluctuation during plasma initiation in JT-60SA. From the simulation using the ＂PSCAD/EMTDC＂ code, it is found that these control methods can drastically reduce the reac- tive power induced by the four units of the ＂Booster PS＂. In addition, the voltage fluctuation of the motor-generator connected to the ＂Booster PS＂ is expected to be suppressed. This can also contribute to achieve stable control of the JT-60SA magnet power supplies.

关键词： JT-60SA power supply poroidal field coil reactive power fluctuation asym-metric control PSCAD/EMTDC

A Flat Spectral Response AWG Demultiplexer Composed of Slabs with Islands and Peninsulas

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光学学报 2003年第S1期23卷 157-158页

作者： Yutaka Natsume Junji yamauchi Ryoichi Tazawa Koji Ishikawa Shigeru Kawaguchi Yuichi Yamamoto Hisamatsu Nakano R & D Department NHK Spring Co. Ltd. 3-10 Fukuura Kanazawa-ku Yokohama 236-0004 Japan Faculty of Engineering Hosei University 3 -7-2 Kajino-cho Koganei Tokyo 184-8584 Japan

Phase adjustment elements called islands and peninsulas are introduced to obtain an AWG demultiplexer with a flat spectral response. Use of the peninsulas enables us to achieve a IdB bandwidth of 0.5 nm.

关键词： spectral response

Synergistic Antibacterial Performance of a Cu/WO3-Added PTFE Particulate Superhydrophobic Composite under Visible-Light Exposure

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Journal of Biomaterials and Nanobiotechnology 2012年第4期3卷 421-430页

作者： Yanyan Yao Kentaro yamauchi Goro yamauchi Tsuyoshi Ochiai Taketoshi Murakami Yoshinobu Kubota Collaborative Research Centre Daido University Nagoya Japan Department of Information Design Daido University Nagoya Japan Department of Urology and Molecular Science Graduate School of Medicine Yokohama City University Yokohama Japan Kanagawa Academy of Science and Technology Kawasaki Japan

Addition of TiO2 to a polytetrafluoroethylene (PTFE) particle-dispersed composite contributes to the self-cleaning properties of the water-repellent composite. However, its application is limited to outdoor usage or under ultraviolet (UV) irradiation. In this study, a novel visible-light-sensitive photocatalytic and superhydrophobic material was developed by adding Cu/WO3 to a PTFE particulate composite material to overcome this deficit. A remarkable property of this novel composite material is the synergistic antibacterial performance against Escherichia coli (E. coli), Staphylo-coccus aureus, and methicillin-resistant Staphylococcus aureus compared with the addition of Cu/WO3 without PTFE particles material. During 24-h exposure in visible light at 2000 lx, the number of viable cells of the three strains on the surface of the 8wt% Cu/WO3-added PTFE particulate composite decreased from 2 – 4 × 105 colony-formation units (CFUs) to less than 10, the limit of detection. This bactericidal rate is four times higher than that of 8wt% Cu/WO3 without PTFE particles material, which is attributed to the air trapped in the rough surface of the novel material providing additional oxygen to the photocatalytic reaction. Even for exposure to visible light at 100 lx, the decrease in CFUs of E. coli on the 12wt% Cu/WO3-added PTFE particulate composite reached nearly 2.0 logs. The characterization of the Cu/WO3-added PTFE particulate composite indicated that the composite material containing 80wt% PTFE maintained a superhydrophobic or water-repellent property with a water contact angle >150。, although the Cu/WO3 in the composite material remained hydrophilic under visible light. The Cu/WO3-added PTFE particulate composite displayed photo-catalytic reactions to decompose oleic acid adsorbed on its surface and gaseous acetaldehyde under UV-A and visible-light illumination. All results demonstrate that the Cu/WO3-added PTFE particulate composite material may be used in sterilization, a

关键词： Cu/WO3 Photocatalyst PTFE-Hydrophobicity Particulate-Composite Synergistic Antibacterial Performance Escherichia Coli MRSA

Isolation, Identification and Tyrosinase Inhibitory Activities of the Extractives from Allamanda cathartica

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Natural Resources 2011年第3期2卷 167-172页

作者： Kosei yamauchi Tohru Mitsunaga Irmanida Batubara 不详

Tyrosinase inhibitory activity of the extractives from A. cathartica was examined and their new bioactivity and potent active compounds were identified. Five compounds, glabridin, new lignan, kaempferol, naringenin, and allamandicin, were isolated by a series of chromatography, and identified by NMR and LC-MS. Among them, glabridin had the high-est tyrosinase inhibitory activity (IC50:2.93 μM) which is 15 times stronger than that of kojic acid used as positive con-trol (IC50:43.7 μM). Moreover the lignan was indentified as 1-[3-(4-allyl-2,6-dimethoxyphenoxy)-4-methoxyphenyl] propane-1,2,diol which was a novel lignan.

关键词： Allamanda c athartica Tyrosinase Glabridin Kaempferol Naringenin Allamandicin

Detailed Analysis of the Transient Voltage in a JT-60SA PF Coil Circuit

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Plasma Science and Technology 2013年第2期15卷 148-151页

作者： K. yamauchi K. SHIMADA T. TERAKADO M. MATSUKAWA R. COLETTI A. LAMPASI E. GAIO A. COLETTI L. NOVELLO Japan Atomic Energy Agency 801-1 Mukoyama Naka Ibaraki 311-0193 Japan ENEA 1-00044 Frascati Rome Italy Consorzio RFX Euratom-ENEA Association C.so Stati Uniti 4Padova Veneto 35127Italy Fusion for Energy Boltzmannstr 2Garching Bavaria 85748 Germany

A superconducting coil system is actually complicated by the distributed parameters, e.g. the distributed mutual inductance among turns and the distributed capacitance between adjacent conductors. In this paper, such a complicated system was modeled with a reasonably simplified circuit network with lumped parameters. Then, a detailed circuit analysis was conducted to evaluate the possible voltage transient in the coil circuit. As a result, an appropriate （minimum） snubber capacitance for the Switching Network Unit, which is a fast high voltage generation circuit in JT-60SA, was obtained.

关键词： JT-60SA power supply transient voltage snubber PSIM

Low Resistive TiO2Deposition by LPCVD Using TTIP and NbF5in Hydrogen-Ambient

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Journal of Crystallization Process and Technology 2015年第1期5卷 15-23页

作者： Satoshi yamauchi Kazuhiro Ishibashi Sakura Hatakeyama Department of Biomolecular Functional Engineering Ibaraki University Hitachi Japan

Low resistive TiO2 layer was deposited by low pressure chemical vapor deposition (LPCVD) at pressure around 0.25 Pa using titanium-tetra-iso-propoxide (TTIP) and NbF5 in H2-ambient. Acti-vation energy for the deposition rate on the temperature was significantly decreased to 120 kJ/mol as compared with 228 kJ/mol for the deposition in H2 without NbF5. The deposition rate linearly increased with NbF5 supply rate but gradually decreased with H2 supply rate indicated that F on the deposition surface acts as catalyst for TTIP-dissociation but is non-activated by hydrogen. Resistivity of the layer was decreased by NbF5 supply depending on the deposition temperature with the activation energy of 319 kJ/mol, whereas the energy was 244 kJ/mol for the layer deposited in H2 without NbF5. The dependence of resistivity on NbF5. and H2 supply rates suggested that the doping should be performed by sufficient NbF5 and H2 supply rate to improve the crystallinity. As a result of the optimization, the resistivity was successfully reduced to 5 × 10-2 Ω·cm. Optical transmission spectra in UV-Vis region indicated that significant absorption observed for the layer deposited in H2 was notably decreased by using NbF5. The improved optical property was better than that for the layer deposited in O2-ambient.

关键词： LPCVD-TiO2 H2-Ambient Nb and F Doping Low-Resistive TiO2 Optical Transmittance

Plasma-Assisted Chemical Vapor Deposition of Titanium Oxide Layer at Room-Temperature

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Journal of Crystallization Process and Technology 2014年第1期4卷 20-26页

作者： Satoshi yamauchi Hiromi Suzuki Risa Akutsu Department of Biomolecular Functional Engineering Ibaraki University Hitachi Japan.

Plasma-assisted chemical vapor deposition (PCVD) at pressure as low as 3 mtorr using titanium-tetra-isopropoxide (TTIP) and oxygen mixed gas plasma generated by 13.56 MHz radio frequency power (RF-power) below 70 W were applied to deposit titanium-oxide layer at temperature under 40°C. Plasma optical emission spectroscopy and FTIR indicated that density of OH group in the amorphous layer was related to the density of OH or H2O in the plasma and the species was formed on electrode to induce the RF-power. Hydrophilicity on the layer was dependent on the density of chemisorbed OH, but was degraded by the excess OH. The PCVD-TiOx coating was demonstrated on polyethylene terephthalate and showed good hydrophilic property with the contact angle of water about 5°.

关键词： PCVD Amorphous Titanium-Oxide FTIR Hydroxyl Hydrophilicity

Subcellular western blotting of single cells

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Microsystems & Nanoengineering 2017年第1期3卷 405-413页

作者： Kevin A.yamauchi Amy E.Herr Department of Bioengineering University of CaliforniaBerkeleyCA 94720USA The UC Berkeley—UCSF Graduate Program in Bioengineering University of CaliforniaBerkeleyCA 94720USA

Although immunoassays are the de facto standard for determining subcellular protein localization in individual cells,antibody probe cross-reactivity and fixation artifacts remain confounding *** enhance selectivity while providing single-cell resolution,we introduce a subcellular western blotting technique capable of separately assaying proteins in the 14 pL cytoplasm and 2 pL nucleus of individual *** confer precision fluidic control,we describe a passive multilayer microdevice that leverages the rapid transport times afforded by *** isolating single cells in microwells,we apply single-cell differential detergent fractionation to lyse and western blot the cytoplasmic lysate,whereas the nucleus remains intact in the ***,we lyse the intact nucleus and western blot the nuclear *** index each protein analysis to the originating subcellular compartment,we utilize bi-directional electrophoresis,a multidimensional separation that assays the lysate from each compartment in a distinct region of the separation ***-cell bi-directional electrophoresis eliminates the need for semi-subjective image segmentation algorithms required in *** subcellular,single-cell western blot is demonstrated for six targets per cell,and successfully localizes spliceosome-associated proteins solubilized from large protein and RNA complexes,even for closely sized proteins(a 7 kDa difference).Measurement of NF-κB translocation dynamics in unfixed cells at 15-min intervals demonstrates reduced technical variance compared with *** chemical cytometry assay directly measures the nucleocytoplasmic protein distribution in individual unfixed cells,thus providing insight into protein signaling in heterogeneous cell populations.

关键词： cytometry microfluidic design proteomics single-cell analysis

Enhanced Photo-Induced Property of LPCVD-TiO2Layer on PCVD-TiOxInitial Layer

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Journal of Materials Science and Chemical Engineering 2015年第7期3卷 28-38页

作者： Satoshi yamauchi Keisuke Yamamoto Sakura Hatakeyama Department of Biomolecular Functional Engineering Hitachi Japan

Plasma-assisted chemical vapor deposition (PCVD) was applied for amorphous TiOx deposition on Pyrex-glass substrate at low temperature below 90°C to control orientation of anatase-TiO2 layer by low pressure chemical vapor deposition (LPCVD) using TTIP-single precursor. Preferentially -oriented anatase-TiO2 layer was successfully deposited with the orientation ratio as high as 68% on the initial layer of the thickness around 70 nm. Contact angle water was quickly decreased by UV-irradiation on the highly -oriented TiO2 layer comparing with the layer directly deposited on glass, whereas surface roughness on the former was significantly reduced in comparison to that on the latter. Methyleneblue (MB) aqueous solution with the concentration of 2 mmol/L was used to evaluate photocatalytic property on the layer. Rate constant of MB-decomposition via first order kinetics increased with the orientation ratio above 60% was resulted in 2.3 × 10-1?min-1 for the layer with -orientation ratio of 68%, whereas the constant was 2.8 × 10-3 min-1 for the layer directly deposited on glass.

关键词： LPCVD Anatase-TiO2 PCVD TiOx Hydrophilicity Photocatalyst