JOPSS - Search Results

Journal Articles

Thiophene adsorption on phosphorus- and nitrogen-doped graphites; Control of desulfurization properties of carbon materials by heteroatom doping

Shimoyama, Iwao; Baba, Yuji

Carbon, 98, p.115 - 125, 2016/03

https://doi.org/10.1016/j.carbon.2015.10.094

Times Cited Count：34 Percentile：72.4(Chemistry, Physical)

The amounts of adsorbed thiophene were compared among phosphorus- and nitrogen-doped graphite and graphite damaged by Ar $^{+}$ irradiation to clarify the influence of heteroatom doping on the adsorptive desulfurization properties of -conjugated carbon materials. On the basis of thiophene coverages estimated from X-ray photoelectron spectroscopy, Phosphorus-doped graphite had an adsorption ability that was 10-20 times larger than that of Nitrogen-doped graphite, indicating that the adsorptive desulfurization property of carbon largely depends on dopant atoms. Polarization dependent analysis using near-edge X-ray absorption fine structure spectroscopy was used to distinguish the configurations at dopant sites, indicating that the curved structures of phosphorus sites exhibited approximately 10 times greater adsorption abilities when compared with the planar structures. Theoretical simulation using molecular orbital calculations indicated different dopant effects between phosphorus and nitrogen along with different thiophene adsorption behaviors between planar and curved structures. Finally, experimental thiophene desorption results obtained at different temperatures revealed an advantage of phosphorus doping for reactivation.

Journal Articles

Proposal of the prediction method using a competing risk model on the bending strength of 2D-C/C composites

Ishihara, Masahiro; Hanawa, Satoshi; Sogabe, Toshiaki; Tachibana, Yukio; Iyoku, Tatsuo

Materials Science Research International, 10(1), p.65 - 70, 2004/04

no abstracts in English

Journal Articles

Tritium removal using wall conditioning discharges in JT-60U

Higashijima, Satoru; Nakamura, Hirofumi; Horikawa, Toyohiko*; Kaminaga, Atsushi; Seki, Masami; Kubo, Hirotaka; Konishi, Satoshi; Tanabe, Tetsuo*

Proceedings of 30th EPS Conference on Controlled Fusion and Plasma Physics (CD-ROM), 4 Pages, 2003/00

no abstracts in English

Journal Articles

Measurement of the chemical sputtering yields of CH $_{4}$ /CD $_{4}$ and C $_{2}$ H $_{x}$ /C $_{2}$ D $_{x}$ at the carbon divertor plates of JT-60U

Nakano, Tomohide; Kubo, Hirotaka; Higashijima, Satoru; Asakura, Nobuyuki; Takenaga, Hidenobu; Sugie, Tatsuo; Itami, Kiyoshi

Nuclear Fusion, 42(6), p.689 - 696, 2002/06

https://doi.org/10.1088/0029-5515/42/6/307

Times Cited Count：46 Percentile：79.04(Physics, Fluids & Plasmas)

no abstracts in English

Journal Articles

Coefficient of thermal expansion

Oku, Tatsuo*; Baba, Shinichi

Tanso, 2002(202), p.90 - 95, 2002/05

https://doi.org/10.7209/tanso.2002.90

no abstracts in English

Journal Articles

Studies of ELM heat load, SOL flow and carbon erosion from existing Tokamak experiments, and projections for ITER

Asakura, Nobuyuki; Loarte, A.*; Porter, G.*; Philipps, V.*; Lipschultz, B.*; Kallenbach, A.*; Matthews, G.*; Federici, G.*; Kukushkin, A.*; Mahdavi, A.*; et al.

IAEA-CN-94/CT/P-01, 5 Pages, 2002/00

Three important physics issues for the ITER divertor design and operation are summarized based on the experimental and numerical work from multi-machine database (JET, JT-60U, ASDEX Upgrade, DIII-D, Alcator C-Mod and TEXTOR). (i) The energy load associated with Type-I ELMs is of great concern for the lifetime of the ITER divertor target. In order to understand the physics base of the scaling models, the ELM heat and particle transport to the divertor is investigated. Convective transport during ELMs plays an important role in heat transport to the divertor. (ii) Determination of the SOL flow pattern and the driving mechanism has progressed experimentally and numerically. Influences of the drift effects on the SOL and divertor plasma transport were discussed. (iii) Characteristics of chemical yield at two different deposited carbon surfaces, i.e. erosion- and redeposition-dominated areas, have been studied. Progress of understanding the chemical erosion is reviewed.

Journal Articles