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Y.Uchihori,Y.Kawamura,S.Morita,A.Kojina,J.M.Sun,Y.J.Kim,T.Izumi,M.Nakaoka 전력전자학회 1995 ICPE(ISPE)논문집 Vol.1995 No.10
This paper presents a novel prototype of a new concepttonal electromagnetic induction fluid heating appliance with eddy current-based flow-through thin metallic heater assembly, which is composed of the voltage source-fed type phase-shifted PWM series-load resonant high-frequency inverter using IGBT modules and thek driver modules in addition to a temperature sensor, and an auto-tuning PID gain controller for precise and stable temperature regulation scheme.<br/> In particular, the efficient series capacitor-compensated load resonant high-frequency inverter system with a power factor correction and active sinewave line current shaping functions is introduced as this induction-heated fluid heating appliance in pipeline used for industrial, medical, chemical, consumer power processing apphca-tions.<br/> Its operating characteristics in steady-state are illustrated and evaluated in experiment and its computer simulation results. The promising cost effective applications of this induction-heated fluid-heating appliance are mentioned from a practical point of view.
Progress in R&D of coated conductor in M-PACC project
Izumi, T.,Ibi, A.,Nakaoka, K.,Taneda, T.,Yoshida, T.,Takagi, Y.,Nakamura, T.,Machi, T.,Katayama, K.,Sakai, N.,Yoshizumi, M.,Koizumi, T.,Kimura, K.,Kato, T.,Kiss, T.,Shiohara, Y. The Korea Institute of Applied Superconductivity a 2014 한국초전도저온공학회논문지 Vol.16 No.2
The five-year national project in Japan for R&D of coated conductors and applications, named as the Materials and Power Applications of Coated Conductors (M-PACC) project, was finished at the end of FY2013. The project consists of four sub-themes as cable, transformer, SMES and coated conductors. In the theme of coated conductors, the fabrication process had been developed to satisfy the requirements from the applications such as in-field $I_c$ performance, low AC loss in the long tapes etc. Through the project, the remarkable progress was achieved as follows; a high in-field minimum $I_c$ value over 54A/cm-width under 3T at 77K was realized in a 200m long EuBCO tape with artificial pinning centers of $BaHfO_3$ by the pulsed laser deposition (PLD) technique on the IBAD template. On the other hand, the AC loss reduction was confirmed in the tapes fabricated by both PLD and the metal organic deposition (MOD) techniques by scribing 100m tapes into 10-filamments. Additionally, the mechanism of the delamination phenomenon was systematically investigated and the strength was improved by eliminating the origins of the weak points in the films. Through the development, all targeted goals were accomplished and the several results were appreciated as a world champion data.
Motion Control of Linear Pulse Motor for Artificial Heart
H.Yamada,T.Mizuno,Y.Izumi,H.Wakiwaka,Y.Kataoka,Y.Kikuchi 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
This paper deals with the difference of the static and kinetic thrust characteristics of a linear pulse motor (LPM) without and with feedback control for a total artificial heart (TAH). In general, the kinetic thrust of a LPM without feedback control decreases as increasing the mover velocity. The kinetic thrust characteristics of the LPM with feedback control are improved approximately 30 % as compared with the LPM without feedback control in the high velocity range.<br/>
Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
The authors are tackling the development of novel chemical sensor elements for detecting air pollutants. The base material of the sensor elements is porous glass, which has favorable features such as transparency and porosity. The sensor elements were prepared by impregnating reagents in a sheet of porous glass. The reagents were the Saltzman reagent for the detection of nitrogen dioxide, β-diketones for formaldehyde and potassium iodide for oxidant. The resultant elements were colorless. The first element was highly sensitive and changed to clear wine red upon exposures to nitrogen dioxide. The second element for formaldehyde developed yellow and was detectable as low as a few tens ppb for an exposure time of 8 h. The third element for oxidant also showed high sensitivity. Evaluation of the effects of various gases on these elements, which are indispensable in applying them to the real atmosphere, is underway except for the NO2 elements. The concept leading to the present study is briefly explained.
Interferences of various gases on porous glass-based formaldehyde sensors
Satoru Tokumitsu,Katsuyuki Izumi,Masahiro Utiyama,Yasuko Y. Maruo 제어로봇시스템학회 2008 제어로봇시스템학회 국제학술대회 논문집 Vol.2008 No.10
In order to examine the influences of various gases on sensor elements developed recently for the detection of gaseous formaldehyde, experiments were made in which the elements were exposed to air including one of the test gases. The elements are made of a porous glass sheet in which β-diketone (acetylacetone or 1-phenyl-1,3-butanedione) and ammonium ion are impregnated and both of the elements turn yellow from colorless upon exposures to formaldehyde. The experiments were made under a concentration of 2000ppm and a 50% relative humidity. As a result, aromatics such as benzene, toluene and ethylbenzene were found to cause no color changes. On the other hand, aldehydes and compounds having one or more C-C double bonds turned the two elements yellow. However the effects of these compounds are expected to be negligible under the realistic conditions, in view of the facts that the values of absorbance of light at peak wavelengths for these compounds were small and that the concentrations of the gases tested in this study were several orders of magnitude higher than those in the real atmosphere, even in the indoor environment.
An, B.K.,Kang, C.W.,Izumi, Y.,Kobayashi, Y.,Tanaka, K. Asian Australasian Association of Animal Productio 2003 Animal Bioscience Vol.16 No.2
The effects of dietary sources of C18:2 n-6 or C18:3 n-3 fatty acids on the occurrence of conjugated linoleic acid (CLA) and time-dependent changes of free fatty acid fractions in rumen contents were investigated. Sheep (n=4) fitted with rumen fistula were used in a 44 Latin square design wxith each 14 d period. Sheep were fed one of four diets consisting of grass hay and concentrates in a ratio of 70:30. Dietary treatments were 100% concentrates (served as the control), and concentrates were replaced by safflower seed at 30% (SFS), safflower meal at 18% - safflower oil at 12% (SFO), and safflower meal at 18%-linseed oil at 12% (LNO). At the end of each experimental period, rumen contents from each sheep were collected before feeding and at 1, 3, 6 and 12 h after feeding. The levels of cis-9, trans-11 CLA in free fatty acid fraction were considerably increased in all treated groups relative to the control, but not significantly. The increase in cis-9, trans-11 CLA was slightly higher in SFS and SFO groups than group fed diet containing linseed oil. The level of cis-9, trans-11 CLA in free fatty acid fraction was reached to the maximum value at 1hr after feeding and, thereafter gradually decreased to near the value before feeding. The generation of trans-11 C18:1 was significantly higher in all treated groups than that of control. The level of trans-11 C18:1 was linearly increased after feeding of experimental diets, reaching the maximum value at 3 h. Feeding of diets containing polyunsaturated fats to sheep resulted in a marked increase in the levels of trans-11 C18:1 and a slight increase of CLA in free fatty acid fraction of rumen contents. Our results support that endogenous synthesis of CLA from trans-11 C18:1 may be involved the primary source of CLA in dairy product. (Asian-Aust.
( Keiji Hirai ),( Susumu Ookawara ),( Taisuke Kitano ),( Haruhisa Miyazawa ),( Kiyonori Ito ),( Yuichirou Ueda ),( Yoshio Kaku ),( Taro Hoshino ),( Honami Mori ),( Izumi Yoshida ),( Kenji Kubota ),( Y 대한신장학회 2017 Kidney Research and Clinical Practice Vol.36 No.2
Background: Mizoribine (MZR) is an immunosuppressive drug used in Japan for treating patients with lupus nephritis and nephrotic syndrome and has been also reportedly effective in patients with immunoglobulin A (IgA) nephropathy. However, to date, few randomized control studies of MZR are performed in patients with IgA nephropathy. Therefore, this prospective, open-label, randomized, controlled trial aimed to investigate the efficacy and safety of adding MZR to standard treatment in these patients, and was conducted between April 1, 2009, and March 31, 2016, as a multicenter study. Methods: Patients were randomly assigned (1:1) to receiving standard treatment plus MZR (MZR group) or standard treatment (control group). MZR was administered orally at a dose of 150 mg once daily for 12 months. Results: Primary outcomes were the percentage reduction in urinary protein excretion from baseline and the rate of patients with hematuria disappearance 36 months after study initiation. Secondary outcomes were the rate of patients with proteinuria disappearance, clinical remission rate, absolute changes in estimated glomerular filtration rate from baseline, and the change in daily dose of prednisolone. Forty-two patients were randomly assigned to MZR (n = 21) and control groups (n = 21). Nine patients in MZR group and 15 patients in the control group completed the study. No significant differences were observed between the two groups with respect to primary and secondary outcomes. Conclusion: The addition of MZR to standard treatment has no beneficial effect on reducing urinary protein excretion and hematuria when treating patients with IgA nephropathy.