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Edge Density Profile Measurement by Using Ultrashort Pulsed Radar Reflectometer on LHD
tokihiko Tokuzawa,K. Kawahata,K. Tanaka 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
We have installed a ten-channel Ka-band ultrashort pulsed radar reflectometer system which uses an ultrashort sub-cycle pulse and performed an edge electron density profile measurement in the Large Helical Device. The delay time of the reflected pulses from each cut-off layer in the plasma is measured by a time-of-flight measurement technique in order to avoid a mixture of the radiation effect and spurious reflection. The electron density profile is obtained by reconstruction by using an Abel inversion method from the profile of the delay time as a function of the probing frequency. In the density modulation experiment, the time evolution of the reconstructed density profile is used for the particle transport study.I
Hiroaki Kajikawa,Kazunori Ide,Tokihiko Kobat 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
A new pressure balance with a controlled-clearance (CC) piston-cylinder has been developed with the aim of reducing the uncertainty of the pressure especially at high pressure. The effective area of the CC piston-cylinder was estimated based on the Heydemann-Welch model. Two parameters in this model, the jacket pressure coefficient and the zero clearance jacket pressure, were determined from characterization experiments. Then, the pressure dependence of the effective area and its uncertainty were calculated. In this paper, the uncertainty of the effective area for a 100 MPa piston-cylinder is evaluated in detail. The resultant uncertainty of the pressure dependence of the effective area was found to be less than 0.7 × 10<SUP>?7</SUP> MPa<SUP>?1</SUP> at pressures higher than 20 MPa.
Final report on key comparison APMP.M.P-K13 in hydraulic gauge pressure from 50 MPa to 500 MPa
Kajikawa, Hiroaki,Kobata, Tokihiko,Yadav, Sanjay,Jian, Wu,Changpan, Tawat,Owen, Neville,Yanhua, Li,Hung, Chen-Chuan,Ginanjar, Gigin,Choi, In-Mook BUREAU INTERNATIONAL DES POIDS ET MESURES 2015 METROLOGIA -BERLIN- Vol.52 No.-
<P>This report describes the results of a key comparison of hydraulic high-pressure standards at nine National Metrology Institutes (NMIs: NMIJ/AIST, NPLI, NMC/A*STAR, NIMT, NMIA, NIM, CMS/ITRI, KIM-LIPI, and KRISS) within the framework of the Asia-Pacific Metrology Programme (APMP) in order to determine their degrees of equivalence in the pressure range from 50 MPa to 500 MPa in gauge mode. The pilot institute was the National Metrology Institute of Japan (NMIJ/AIST). All participating institutes used hydraulic pressure balances as their pressure standards. A set of pressure balance with a free-deformational piston-cylinder assembly was used as the transfer standard. Three piston-cylinder assemblies, only one at a time, were used to complete the measurements in the period from November 2010 to January 2013. Ten participants completed their measurements and reported the pressure-dependent effective areas of the transfer standard at specified pressures with the associated uncertainties. Since one of the participants withdrew its results, the measurement results of the nine participants were finally compared. The results were linked to the CCM.P-K13 reference values through the results of two linking laboratories, NMIJ/AIST and NPLI. The degrees of equivalence were evaluated by the relative deviations of the participants' results from the CCM.P-K13 key comparison reference values, and their associated combined expanded (<I>k</I>=2) uncertainties. The results of all the nine participating NMIs agree with the CCM.P-K13 reference values within their expanded (<I>k</I>=2) uncertainties in the entire pressure range from 50 MPa to 500 MPa. </P><P><B>Main text.</B> To reach the main text of this paper, click on <A HREF='http://www.bipm.org/utils/common/pdf/final_reports/M/P-K13/APMP.M.P-K13.pdf'>Final Report</A>. Note that this text is that which appears in Appendix B of the BIPM key comparison database <A HREF='http://kcdb.bipm.org/'>kcdb.bipm.org/</A>.</P> <P>The final report has been peer-reviewed and approved for publication by CCM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).</P>
Togasaki, Norihiro,Yokoshima, Tokihiko,Oguma, Yasumasa,Osaka, Tetsuya The Korean Electrochemical Society 2021 Journal of electrochemical science and technology Vol.12 No.4
For a battery module where single cells are connected in series, the single cells should each have a similar state of charge (SOC) to prevent them from being exposed to an overcharge or over-discharge during charge-discharge cycling. To detect the existence of unbalanced SOC cells in a battery module, we propose a simple measurement method using a single-frequency response of electrochemical impedance spectroscopy (EIS). For a commercially available graphite/nickel-cobalt-aluminum-oxide lithium-ion cell, the cell impedance increases significantly below SOC20%, while the impedance in the medium SOC region (SOC20%-SOC80%) remains low with only minor changes. This impedance behavior is mostly due to the elementary processes of cathode reactions in the cell. Among the impedance values (Z, Z', Z"), the imaginary component of Z" regarding cathode reactions changes heavily as a function of SOC, in particular, when the EIS measurement is performed around 0.1 Hz. Thanks to the significant difference in the time constant of cathode reactions between ≤SOC10% and ≥SOC20%, a single-frequency EIS measurement enlarges the difference in impedance between balanced and unbalanced cells in the module and facilitates an ~80% improvement in the detection signal compared to results with conventional EIS measurements.