Affiliation: | a Graduate School of Energy Science, Kyoto University, Gokasho, Uji, 611-0011 Kyoto, Japan b Engineering of Tribology Institute, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, 702-701 Daegu, Republic of Korea c Department of Mechanical Engineering, Kyungpook National University, 1370 Sankyuk-dong, Buk-gu, 702-701 Daegu, Republic of Korea d Institute of Advanced Energy, Kyoto University, Gokasho, Uji, 611-0011 Kyoto, Japan |