IEEJ Transactions on Fundamentals and Materials
Online ISSN : 1347-5533
Print ISSN : 0385-4205
ISSN-L : 0385-4205
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Volume 134, Issue 1
Displaying 1-21 of 21 articles from this issue
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Special Issue on Technology 2014: Review & Forecast
Preface
Special Issue Review
  • Present Situation of Numerical Simulation of Atmospheric Pressure Discharge Plasma
    Fumiyoshi Tochikubo
    2014 Volume 134 Issue 1 Pages 2-5
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.2
    JOURNAL FREE ACCESS
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    Numerical simulation of atmospheric pressure discharge plasma helps us to understand the detailed physical and chemical phenomena occurring in the plasma. This report briefly describes the past progress and present situation of numerical simulation of atmospheric pressure discharge plasma.
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  • Latest Report about Biomagnetism, including Transcranial Magnetic Stimulation
    Yoshinori Katayama
    2014 Volume 134 Issue 1 Pages 6-9
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.6
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    Recently the biomagnetism and its medical applications become popular than ever, by understanding the usefulness of it (such as MRI) widely spreading among people. The noncontact and noninvasive features of the magnetic applications reduce the risk of subjects. This paper introduces recent trends around the biomagnetism and its medical applications slightly focusing on the recent topics about the transcranial magnetic stimulation (TMS).
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  • Trend of Research and Development in Dielectrics and Insulating Materials
    —Topics from the Symposium in 2012—
    Yasuhiro Tanaka
    2014 Volume 134 Issue 1 Pages 10-13
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.10
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    This is a review of the 43rd Symposium on Electrical and Electronic Insulating Materials and Applications in Systems (SEEIMAS) hosted by Technical Committee on Dielectrics and Electrical Insulation (TC-DEI) in IEEJ in order to overview the research trend in this specific field. Application of various kinds of numerical simulation, functionalized thin materials, aging of insulating materials under various condition, insulation system under inverter surges, space charge assessment, asset management regarding to insulation performance, outdoor insulations, thin dielectric films and other topics are dealt with. The proceedings booklet in Japanese, with English abstract and figure captions for each presentation, will be available at the IEEJ office.
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  • Recent Progress of Superconducting Integrated Circuit Technologies Challenging the Limits in Low Power Consumption
    Nobuyuki Yoshikawa
    2014 Volume 134 Issue 1 Pages 14-17
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.14
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    Superconducting logic circuits, which utilize a single flux quantum as logical bit information, have outstanding properties as a logic circuit in terms of power consumption and operation speed. In this paper, recent progress of superconducting integrated circuit technologies, which aim the reduction of the power consumption of high-end computing systems and have potential to approach the physical limit of energy consumption in computation, will be reviewed.
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  • Recent Topics in Instrumentation and Measurement
    Kazuo Tanabe, Takashi Kawamura, Takeshi Imaike
    2014 Volume 134 Issue 1 Pages 18-21
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.18
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    Instrumentation and measurement play a vital role in research and development in the science and engineering fields. Recently, the goals of instrumentation and measurement have expanded to meet not only the industrial and science requirements but also the needs in all fields of social life, such as medicine and welfare, the environment, and disaster and security.
    In this article, recent technical topics in the instrumentation and measurement field are reported.
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  • Electron Guns for Free-Electron Lasers
    Makoto R. Asakawa, Soichiro Yamaguchi, Mitsuhiro Kusaba, Yoshiaki Tsun ...
    2014 Volume 134 Issue 1 Pages 22-25
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.22
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    Developments of two types of the electron gun are presented. One is a compact DC electron gun using Field Emitter Array (FEA) as the cold cathode, the other is a photoinjector which outputs sub-pico second electron beam pulse. The FEA electron gun achieved to producing a 2 mA/50 kV electron beam. The photoinjector experiments revealed an exotic space-charge effect on the ultra-shot electron beam pulse.
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  • Novel Development of Ultra-Fast and Ultra-High Density Magnetic Recording
    Shinichiro Ohnuki, Katsuji Nakagawa, Yoshito Ashizawa, Arata Tsukamoto ...
    2014 Volume 134 Issue 1 Pages 26-29
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.26
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    This paper reviews our recent progress of a novel magnetic recording method which is based on all-optical magnetic recording and plasmonic antennas with bit-patterned media. Using our technique, magnetization reversal occurs at the femtosecond time scale and recording density is over 2 Tbit/inch2. We will verify our recording method in terms of precise electromagnetic simulation for ultra-short time light pulse.
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  • Research Trend on Generation and Measurement for High-Energy-Density Plasma by using Pulsed-power Discharges
    Toru Sasaki, Takashi Kikuchi, Kazuhiko Horioka
    2014 Volume 134 Issue 1 Pages 30-35
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.30
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    Recent progress in high-energy-density physics (HEDP) phenomena generated by pulsed-power discharge has been introduced. To measure properties of warm dense matter (WDM), which is one of the topic in HEDP, we have reviewed the concept of scheme based on pulsed-power discharge. To generate a well-defined warm dense state for evaluating electrical conductivity by using pulsed-power discharge, an isochoric heating of foamed metal has been proposed, where isochoric heating can be achieved by surrounding the foamed metal with a rigid-walled sapphire capillary. The electrical conductivity observed agrees with previous experiments and predictions. For understanding properties of ablated dense tungsten, we have proposed a semi-empirical evaluation of thermal conductivity based on the Wiedemann-Franz law. The results indicate that the thermal conductivity derived from the electrical conductivity ranges from 0.1 to 100WK-1m-1 depending on the density at temperature of 5000K.
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  • Power Electronics Equipment and Electromagnetic Compatibility
    Hidenori Sekiguchi, Tsuyoshi Funaki
    2014 Volume 134 Issue 1 Pages 36-40
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.36
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    The electromagnetic compatibility (EMC) related to power electronics equipment is introduced in this paper. It is important to improve the reliability of electrical and electronic equipment in the actual electromagnetic environment. The power electronics equipment has been recently demanded to reduce the electromagnetic emission or electromagnetic interference (EMI), which stems from the mutual effect between the switching operation of power semiconductor switching devices and parasitic components in the switching circuit. This paper presents the major EMC standards, the origination mechanisms of the common mode noise, and the countermeasure methods to reduce the common mode noise.
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  • Recent Trends of Plasma Engineering
    —Infrared Spectroscopy of Plasma Process and Plasma Processing in Graphene Research—
    Masanori Shinohara, Jaeho Kim
    2014 Volume 134 Issue 1 Pages 41-46
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.41
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    We describe recent trends of plasma engineering on two topics - the infrared spectroscopy of plasma process and plasma processing technologies in graphene research. First, we show the measurement of plasma process with the infrared absorption spectroscopy in multiple internal reflection geometry (MIR-IRAS). This method is a very powerful tool of monitoring of plasma process, because the method has high detection sensitivity and the method can be applied to “in-situ” and “real-time” monitoring of interaction of plasma with material surface. We describe the monitoring method, acquired IR spectra and analysis methods. Second, we show plasma technologies for graphene; graphene has been considered one of key materials in a 21st century industries. For the achievement of graphene applications, various processing technologies have been required. Plasma processings are expected to become essential tools in graphene industries because they can provide answers to the requirement for low-temperature processing and the desirability of dry process.
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Paper
  • Effect of N2 Gas Pressure Ratio and DC Bias on Formation of Iron Nitride Thin Film by RF Sputtering Method
    Takahiro Seki, Kiyozumi Niizuma
    2014 Volume 134 Issue 1 Pages 47-52
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.47
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    In this paper, we investigated the effect of N2 gas pressure ratio and DC bias on the formation of iron nitride thin films deposited by RF sputtering method. As a result, the amounts of γ'-Fe4N and ε-Fe3N, which had high N2 content than that of α”-Fe16N2, increased with increasing N2 gas pressure ratio. From the result of x-ray diffraction, the Fe-N film at the N2 gas pressure ratio of 15% became the single phase of γ'-Fe4N. Therefore, we attempted the formation of α'-martensite and α”-Fe16N2 by applying DC bias voltage. It revealed that it was possible to control the N2 content and the coercive force by applying DC bias voltage. However, the formation of α”-Fe16N2 was not observed.
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  • Numerical Analysis on Substrate-Incident Carbon Flux in Low-Pressure Radio-Frequency CH4 Plasmas for Deposition of Diamond-Like Carbon Films
    Akinori Oda, Hiroyuki Kousaka
    2014 Volume 134 Issue 1 Pages 53-59
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.53
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    Capacitively-coupled hydrocarbon (CH4) plasmas for deposition of diamond-like carbon films have been simulated using a self-consistent one-dimensional fluid model, incorporating the mass balance equations for electrons, ions, radicals and non-radicals, the electron energy balance equation, coupled with the Poisson equation. Despite of low-pressure CH4 gas condition, many positive-ion species, such as C2H4+, CH4+, C2H2+, CH5+ etc., have been found in the plasmas. The non-radical neutrals, such as C2H4, C3H8, C2H2 and C2H6, have also found with higher densities comparable to the source gas density. This result indicates that this complexity of background gas in CH4 plasmas is strongly affected to the electron energy distribution function, which is important for the determination of plasmas properties.
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  • Hydrogen Generation and Desulfurization by Plasma Reforming of Biogas
    Kazuhiro Takahashi, Kohki Satoh, Hidenori Itoh
    2014 Volume 134 Issue 1 Pages 60-64
    Published: January 01, 2014
    Released on J-STAGE: January 01, 2014
    DOIhttps://doi.org/10.1541/ieejfms.134.60
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    An atmospheric packed-bed dielectric barrier discharge is generated by a neon-sign-transformer in an artificial biogas, the mixture ratio of which is CH4/CO2 = 60/40 % with H2S of 2000 ppm, and the decomposition characteristics of the artificial biogas are investigated. It is found that H2, CO and hydrocarbons (CxHy) are produced as major by-products from the biogas, and that H2 has the highest concentration in the by-products, followed by CO and CxHy. It is also found that H2S addition has little effect on H2 generation by the plasma reforming of biogas, and that sulfur atoms in H2S deposit on electrodes and packed materials. The decomposition rates of CH4 and CO2 come to approximately 12 % and 10 %, respectively, and H2 generation-efficiency is 0.85 g/kWh.
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