Search Results 1-20 of 1455

  • Precipitation Behavior of Nitride Inclusions in K418 Alloy under the Continuous Unidirectional Solidification Process

    Yang Fan , Ren Zhongming , Zhao Wencheng , Hou Yuan , Guo Xiliang , Li Qiang , Li Xia , Yu Jianbo , Zhong Yunbo , Deng Kang

    … The precipitation behavior of nitride inclusions in K418 alloy under the continuous unidirectional solidification process was investigated by scanning electron microscopy, ASPEX Explorer, and LECO ONH-836. … There were gradient distributions of the number density, average and max sizes of nitride inclusions along the casting direction, as well as the contents of Ti and N. …

    ISIJ International 61(1), 229-238, 2021

    J-STAGE 

  • Determination of the Size Distribution of Nanoparticles Using Asymmetric Flow Field-flow Fractionation (AF4)  [in Japanese]

    Itabashi Daisuke , Murao Reiko , Taniguchi Shunsuke , Mizukami Kazumi , Takagi Hideaki , Kimura Masao

    … <p>To investigate the performance of the size measurement by asymmetric flow field-flow fractionation (AF4), the measurement results of gold nanoparticles were compared among AF4, transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS) in terms of the average size and full width at half maximum (FWHM) of the size distribution. … Moreover, an increase in the number density of nanometer-sized NbC by heat treatment was successfully detected. …

    Tetsu-to-Hagane 107(1), 82-91, 2021

    J-STAGE 

  • Experimental investigation of ionization front propagating in a 28 GHz gyrotron beam : Observation of plasma structure and spectroscopic measurement of gas temperature

    假家 強 , 南 龍太郎 , Kuniyoshi Tabata , Yuki Harada , Yusuke Nakamura , Kimiya Komurasaki , Hiroyuki Koizumi , Tsuyoshi KARIYA , Ryutaro MINAMI

    … The corresponding electron number density is almost equal to the cut-off density. …

    Journal of Applied Physics 127(6), 063301, 2020-02

    IR 

  • Direct Evidence of Less Charge Accumulation in Highly Durable Polymer Solar Cells Using Operando Electron Spin Resonance Spectroscopy

    丸本 一弘 , Dong Xue , Shinpei Kamiya , Masahiko Saito , Itaru Osaka , Kazuhiro MARUMOTO

    … Here, we report operand electron spin resonance (ESR) spectroscopy of the highly durable PTzNTz polymer solar cells to investigate the mechanism of the device-performance deterioration at a molecular level. … We observe the correlation between the increase in the number of spins and the decrease in the device performance. … The calculation with density functional theory is performed to analyze the charge-accumulation states in the cells. …

    ACS Applied Energy Materials 3(2), 2028-2036, 2020-02

    IR 

  • Enhanced area of current collector increase power generation of microbial fuel cell

    Chai Hyungwon , Jung Sokhee

    … For the practical implementation of MFC as a wastewater treatment process, a number of limitations need to be overcome. … Application of the SS mesh to the cathode (PM) improved maximum power density, optimum current density, and maximum current density by 8.8%, 3.6%, and 6.7%, respectively, compared with P of no SS mesh. …

    Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 31(0), 485, 2020

    J-STAGE 

  • Effect of Cr Addition on Microstructure and Mechanical Properties at Elevated Temperature of Al–Mn–Mg–Si Alloys

    Li Zhen , Qin Jian , Zhang Bo , Nagaumi Hiromi

    … Moreover, the microstructures in as-cast and heat-treated conditions were quantitatively analyzed by optical and transmission electron microscopes. … Number density and volume fraction of dispersoids decreased because of Cr. …

    MATERIALS TRANSACTIONS 61(11), 2095-2100, 2020

    J-STAGE 

  • SAXS and TEM Quantitative Analysis of Plate-like Precipitates in Ti-added Low-carbon Steel

    Tanaka Takaaki , Toji Yuki , Kozikowski Paweł , Ohnuma Masato , Nagano Miho

    … <p>Transmission electron microscopy (TEM) is a powerful tool for analyzing fine precipitates because it can measure the size of the precipitates directly. … The average size, number density and volume fraction of TiC were obtained by SAXS analysis of these samples using a sphere or a disk form factor. …

    ISIJ International 60(10), 2246-2254, 2020

    J-STAGE 

  • Simulation of photon-counting detectors for conversion of dual-energy-subtracted computed tomography number to electron density  [in Japanese]

    SAITO Masatoshi

    Japanese Journal of Medical Physics (Igakubutsuri) 40(3), 107-107, 2020

    J-STAGE 

  • Development and Evaluation of Ion Energy Analyzer for Energetic Ion Measurement in a Linear Plasma Device NUMBER

    OCHIAI Ryosuke , OKAMOTO Atsushi , FUJITA Takaaki , ARIMOTO Hideki , HACHIKUBO Hiroki , SUGIMOTO Minami , IIZUKA Kento

    … In the measurement of the plasma with the electron density of higher than 10<sup>17 </sup>m<sup>−3</sup>, it was found that the collector current was smaller than that deduced from the geometrical transparency of the grids. …

    Plasma and Fusion Research 15(0), 2401040-2401040, 2020

    J-STAGE 

  • Magnetic Field Dependence of Transition to High Electron Density Phase in a Linear Plasma Device NUMBER

    HACHIKUBO Hiroki , OKAMOTO Atsushi , FUJITA Takaaki , ARIMOTO Hideki , OCHIAI Ryosuke , SUGIMOTO Minami , IIZUKA Kento

    … <p>High electron density discharge mode was observed in the downstream of a magnetic beach, so called test region in a linear plasma device with an electron cyclotron resonance source. … A model for formation of the high density phase based on electron motion along the field line was proposed. …

    Plasma and Fusion Research 15(0), 2401042-2401042, 2020

    J-STAGE 

  • The Effect of the Amylose Contents on the Rheological Properties of Rice Flour Pastes  [in Japanese]

    Kaneda Isamu , Tanaka Hiroki , Iwasaki Tomohito

    … We can obtain the coordination number (z) which shows the spatial density of the swollen starchy endosperm and starch granules in the rice flour paste using the model. … On the other hand, the observation using scanning electron microscopy revealed that the size of swollen starch granules of KITAMIZUHO was larger than the other rice flour paste. …

    Nihon Reoroji Gakkaishi 48(3), 169-175, 2020

    J-STAGE 

  • Effect of Silicon, Manganese and Heating Rate on the Ferrite Recrystallization Kinetics

    Shah Vitesh , Krugla Monika , Offerman Sven Erik , Sietsma Jilt , Hanlon David Neal

    … microstructure observations using Scanning Electron Microscopy (SEM). … For the later stages of recrystallization, we have studied the change in the number density and the growth rates of the recrystallizing grains using SEM. …

    ISIJ International 60(6), 1312-1323, 2020

    J-STAGE 

  • Addition of Reed-Derived Cellulose Nanofibers to Change Handsheet Properties

    Jin Hailan , Kose Ryota , Okayama Takayuki

    … RCNF addition, especially when combined with ultrasonic treatment, increased the density and tensile strength of the handsheets. … The addition of RCNF decreased the number of voids at the handsheet surface and increased the inter-fiber bonding, as confirmed by scanning electron microscopy images. … The number of such voids was further reduced and inter-fiber bonding was increased by the ultrasonic treatment.</p> …

    Journal of Fiber Science and Technology 76(5), 144-150, 2020

    J-STAGE 

  • Determination of Size Distribution of Nanoparticles Using Asymmetric Flow Field-flow Fractionation (AF4)

    Itabashi Daisuke , Murao Reiko , Taniguchi Shunsuke , Mizukami Kazumi , Takagi Hideaki , Kimura Masao

    … <p>To investigate the performance of the size measurement by asymmetric flow field-flow fractionation (AF4), the measurement results of gold nanoparticles were compared among AF4, transmission electron microscopy (TEM), and small-angle X-ray scattering (SAXS) in terms of the average size and full width at half maximum (FWHM) of the size distribution. … Moreover, an increase in the number density of nanometer-sized NbC by heat treatment was successfully detected. …

    ISIJ International 60(5), 979-987, 2020

    J-STAGE 

  • Development of an Additive Manufactured Artifact to Characterize Unfused Powder Using Computed Tomography

    Tawfik Ahmed , Bills Paul , Blunt Liam , Racasan Radu

    … The mechanical properties of the components depend critically on the density achieved. … In parts produced using AM, the detection of unfused powder using computed tomography is challenging because the detection relies on differences in density. … The powder used was Ti6Al4V, which has a grain size of 45–100 μm, and is typically employed by Arcam electron beam melting (EBM) machines. …

    International Journal of Automation Technology 14(3), 439-446, 2020

    J-STAGE 

  • Stability of Contact Discontinuities in Electrostatic Hybrid- and Full-Vlasov Simulations

    TSUJINE Naru , HARUKI Takayuki , UMEDA Takayuki , NARIYUKI Yasuhiro , SATO Masahiro

    … The ES hybrid-Vlasov simulations show that the sharp gradient of the ion number density is generated at the early stage and is subsequently maintained for a long term. … The generalized Ohm's law shows that the electron pressure gradient accounts for the electric field on the ion time scale in both ES hybrid- and full-Vlasov simulations. …

    Plasma and Fusion Research 15(0), 1401002-1401002, 2020

    J-STAGE 

  • Improvement of Beam Hardening Effects of Virtual Monochromatic Image in Dual-energy CT: A Electron Density Phantom Study  [in Japanese]

    Hirairi Tetsuya , Ichikawa Katsuhiro , Urikura Atsushi , Sugiyama Masanori , Asegawa Satoshi , Matsunami Tamaki

    … <i>Method</i>: We used a water equivalent electron density phantom with a hole in the center for inserting various measurement materials (i.e. fat, two types of bone with differing densities, contrast medium, blood, and water). … The CT number change rates were calculated from the obtained CT numbers with and without beam hardening effect. …

    Japanese Journal of Radiological Technology 76(2), 168-176, 2020

    J-STAGE  Ichushi Web 

  • Characterization of the fast ionization wave induced by a CO2 laser pulse in argon

    嶋村 耕平 , 横田 茂 , Kohei SHIMAMURA , Ippei Yokota , Shigeru YOKOTA

    … To elucidate the physics of the transition threshold, a 5 J CO2 pulse laser, an Echelle spectrometer, and an intensified CCD camera are used for the quantitative investigation of the plasma temperature and density. … Results demonstrate that the FIW front had an electron temperature of 0.7 eV and an electron number density of 2.5 × 1023 m−3. …

    Journal of Applied Physics 126(24), 243304, 2019-12

    IR 

  • Vlasov code simulation of contact discontinuities

    Umeda Takayuki , Tsujine Naru , Nariyuki Yasuhiro

    ファイル公開:2020/10/01

    Physics of Plasmas 26(10), 102107, 2019-10

    IR 

  • Width dependence of the 0.5 × (2e2/h) conductance plateau in InAs quantum point contacts in presence of lateral spin-orbit coupling

    Das Partha Pratim , Cahay Marc , Kalita Shashikala , Mal Sib Sankar , Jha Alok Kumar

    … The evolution of the 0.5Go (Go = 2e2/h) conductance plateau and the accompanying hysteresis loop in a series of asymmetrically biased InAs based quantum point contacts (QPCs) in the presence of lateral spin-orbit coupling (LSOC) is studied using a number of QPCs with varying lithographic channel width but fixed channel length. …

    Scientific Reports (9), 12172-1-12172-10, 2019-08-21

    IR 

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