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Volume 2007 (2007)
- Issue 230 Pages 293-
- Issue 229 Pages 233-
- Issue 228 Pages 143-
- Issue 227 Pages 83-
- Issue 226 Pages 2-
Volume 2007, Issue 229
Displaying 1-9 of 9 articles from this issue
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Keita Ozawa, Sung-Moo Song, Sotaro Yamauchi, Hiroki Wada, Koh-ichi Sug ...2007 Volume 2007 Issue 229 Pages 233-236
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to develop high thermal conductivity materials, Al-Si/CNGCF composites were fabricated by infiltrating Al-Si alloy (JIS-AC3A) into carbon and vapor grown carbon fiber composite (C/VGCF) foam. There was not any void and Al4C3 compound layer on an interface between Al-Si alloy and the foam. The composites achieved higher thermal conductivity (129.5 W/mK) and lower coefficient of thermal expansion (16.4-19.7 ppm/K) than Al-Si alloy (121.0 W/mK-22.4 ppm/K), although the flexural strength was decreased to about 1/3 times that of Al-Si alloy.View full abstractDownload PDF (4649K) -
Soshi Shiraishi2007 Volume 2007 Issue 229 Pages 237-241
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe effect of the kind of electrolyte ions and carbon surface on electric double layer capacitance was investigated using graphitized carbon black (GCB), multi-walled carbon nanotube (MWCNT), or activated carbon (ACF) as active material and (C2H5) 4NBF4, (C4H9) 4NBF4, (C6H13) 4NBF4, (C2H5) 4NCF3SO3, or (C2H5) 4N (CF3SO2) 2N as electrolyte salt for propylene carbonate solution. The GCB and MWCNT, which have no or less microporosity, showed no dependence of the capacitance on the kinds of the electrolyte ions. This suggests that the capacitance is not related to the size of ions adsorbed on carbon surface in the absence of micropores. In the case of the ACF, the smaller capacitances were observed when bulkier ions adsorbing/desorbing. This tendency was more prominent for narrower micropore width, which can be explained by the ion sieving effect of micropores.View full abstractDownload PDF (3372K) -
Norihiko Suzuki, Motoi Machida, Yoko Fujimura, Masami Aikawa, Hideki T ...2007 Volume 2007 Issue 229 Pages 242-248
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMagnesium loaded activated carbon was prepared to increase the adsorption capacity of lead (II) ions from aqueous solution. In case of sufficient amounts of surface acidic functional groups existing on the carbon, no significant improvement of heavy metal removal was observed even if the magnesium was loaded on it, but removing surface oxygen compounds by out-gassing in helium flow at 1173 K before magnesium loading, considerable enhancement of the heavy metal adsorption affinity onto the activated carbon could be observed. The amount of magnesium impregnation in the aqueous solution was also increased using the out-gassed carbon in the preparation. Any detrimental effect was not observed for aromatics adsorption by the introduction of magnesium. All adsorption equilibrium results at 293 K obeyed Langmuir isotherms. Heavy metal ions adsorption onto the magnesium loaded activated carbons progressed via ion exchange mechanism. Based on the Boehm titration surface analysis, the strong heavy metal adsorption sites might be generated forming the magnesium bound to carbon surface via oxygen bridge by means of calcining the magnesium nitrate impregnated out-gassing carbon in air at 653 K.View full abstractDownload PDF (1256K) -
Eiki Ito, Taizou Sano, Ikuyoshi Kouchi, Masaharu Okuda, Takashi Nakano ...2007 Volume 2007 Issue 229 Pages 249-254
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSA furnace for the carbonization under a flow of super-heated steam was constructed. For the carbonization in this furnace, the following factors, temperature of super-heated steam, supplying rate of the precursor and transferring rate of carbonizing materials in carbonization furnace, were possible to be changed. Cypress charcoals prepared in this carbonization furnace were compared with those prepared in Ar gas flow. BET surface area of the charcoal increased above 800°C under superheated steam and reaches about 900 m2/g, which was much higher than that obtained in Ar gas flow. The present results on the carbonization of cypress revealed that carbonization and activation could proceed in one heating process by using super-heated steam.View full abstractDownload PDF (1207K) -
Eiki Ito, Tadashi Yokoi, Michio Inagaki2007 Volume 2007 Issue 229 Pages 255-260
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSCypress charcoals were prepared under super-heated steam at different conditions; different temperatures of super-heated steam of 700-950°C, supplying rates of cypress chips of 15 and 30 kg/h, and transferring rates with the rotation of the paddles of 4.7-18.8 rpm. Pore structure of cypress charcoals was studied by αs plot analysis of adsorption isotherm of N2 gas at 77 K. Pores were developed in the charcoals at temperatures above 800°C; abrupt increase in external surface area Sext. at about 800°C and then increase in microporous surface area S micro. above 850°C. Total surface area Stotal reached up to 1000 m2/g and external surface area Sext. obtained was more than 300 m2/g. Particularly, very high external surface area Sext. of 400-500 m2/g was obtained under a mild condition, i.e., cypress chips are supplied by a rate of 15 kg/h and transferred by a rotation rate of the paddles of 4.7 rpm in carbonization furnace.View full abstractDownload PDF (1212K) -
Akihiko Emori, Akihiko Kudou, Tatsuo Horiba2007 Volume 2007 Issue 229 Pages 261-266
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSWe have developed the lithium ion battery system using amorphous carbon in negative electrode and its management technology for hybrid electric vehicle (HEV) applications. The cell has an output power density as high as 3000 W/kg at 50 % state of charge (SOC) and 25 deg.C, and the 48-cell battery module has an output power of 43 kW. To enable effective and adequate use of this high power battery, we have developed new architecture characterized by the newly developed battery control IC, daisy chain communication circuit without isolator and the decentralized control configuration of cell controller and battery controller. Then, we have determined suitable battery control parameters, such as SOC, state of health (SOH) and allowable current/power, taking into consideration the battery characteristics which mainly result from amorphous carbon, system particulars of IIEVs, and the purpose of these parameters. They were adopted into the software of the battery controller. Both software and hardware of the battery controller is made in the form of platform. Because of the excellent characteristics of this battery, its intrinsically reliable controllability, and the platform for battery control technologies, the battery system is promising not only for HEVs, but also for other applications that require both high power and reliability such as a hybrid electric train.View full abstractDownload PDF (3299K) -
Yoshihiro Hishiyam2007 Volume 2007 Issue 229 Pages 267-274
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (1612K) -
[in Japanese]2007 Volume 2007 Issue 229 Pages 285-288
Published: August 31, 2007
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (2439K) -
2007 Volume 2007 Issue 229 Pages 292
Published: 2007
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDownload PDF (185K)
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