研究者詳細 - 旭　良司

論文 - 旭　良司

分割表示 170 件中 61 - 80 件目／全件表示 >>

Microscopic study of gum-metal alloys: A role of trace oxygen for dislocation-free deformation 査読有り

Nagasako Naoyuki, Asahi Ryoji, Isheim Dieter, Seidman David N., Kuramoto Shigeru, Furuta Tadahiko

ACTA MATERIALIA 105 巻頁： 347 - 354 2016年2月

Transport properties of the Cu2ZnSnS4 bulk systems: Effects of nonstoichiometry and defect formation 査読有り

Hazama Hirofumi, Tajima Shin, Masuoka Yumi, Asahi Ryoji

JOURNAL OF ALLOYS AND COMPOUNDS 657 巻頁： 179 - 183 2016年2月

Upward Shift in Conduction Band of Ta2O5 Due to Surface Dipoles Induced by N-Doping 査読有り

Jinnouchi Ryosuke, Akimov Alexey V., Shirai Soichi, Asahi Ryoji, Prezhdo Oleg V.

JOURNAL OF PHYSICAL CHEMISTRY C 119 巻 ( 48 ) 頁： 26925 - 26936 2015年12月

Sodium distribution in solar-grade Cu2ZnSnS4 layers using atom-probe tomographic technique 査読有り

Tajima Shin, Asahi Ryoji, Isheim Dieter, Seidman David N., Itoh Tadayoshi, Ohishi Kei-ichiro

JAPANESE JOURNAL OF APPLIED PHYSICS 54 巻 ( 11 ) 2015年11月

Thermal diffusion of correlated Li-ions in graphite: A hybrid quantum-classical simulation study 査読有り

Ohba Nobuko, Ogata Shuji, Kouno Takahisa, Asahi Ryoji

COMPUTATIONAL MATERIALS SCIENCE 108 巻頁： 250 - 257 2015年10月

What Makes the Photocatalytic CO2 Reduction on N-Doped Ta2O5 Efficient: Insights from Nonadiabatic Molecular Dynamics 査読有り

Akimov Alexey V., Asahi Ryoji, Jinnouchi Ryosuke, Prezhdo Oleg V.

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 137 巻 ( 35 ) 頁： 11517 - 11525 2015年9月

Improvement of the open-circuit voltage of Cu2ZnSnS4 solar cells using a two-layer structure 査読有り

Tajima Shin, Itoh Tadayoshi, Hazama Hirofumi, Ohishi Keiichiro, Asahi Ryoji

APPLIED PHYSICS EXPRESS 8 巻 ( 8 ) 2015年8月

Theoretical Insights into the Impact of Ru Catalyst Anchors on the Efficiency of Photocatalytic CO2 Reduction on Ta2O5 査読有り

Akimov Alexey V., Jinnouchi R., Shirai S., Asahi R., Prezhdo Oleg V.

JOURNAL OF PHYSICAL CHEMISTRY B 119 巻 ( 24 ) 頁： 7186 - 7197 2015年6月

Highly luminescent flexible amino-functionalized graphene quantum dots@cellulose nanofiber-clay hybrids for white-light emitting diodes 査読有り

Tetsuka H., Nagoya A., Asahi R.

JOURNAL OF MATERIALS CHEMISTRY C 3 巻 ( 15 ) 頁： 3536 - 3541 2015年

Presence of a Doubly-Splitting Site and Its Effect on Thermoelectric Properties of Cu4SnS4 査読有り

Suzumura Akitoshi, Nagasako Naoyuki, Kinoshita Youhei, Watanabe Masaki, Kita Takuji, Asahi Ryoji

MATERIALS TRANSACTIONS 56 巻 ( 6 ) 頁： 858 - 863 2015年

記述言語：英語掲載種別：研究論文（その他学術会議資料等）出版者・発行元：Materials Transactions

Thermoelectric properties of Cu<sub>4</sub>SnS<sub>4</sub> significantly change around 230 K along with a phase transition between a high temperature phase (HT-phase) and a low temperature phase (LT-phase). Here we particularly focus on a very low thermal conductivity of Cu<sub>4</sub>SnS<sub>4</sub>, which is even lower in HT-phase. The crystal structures of Cu<sub>4</sub>SnS<sub>4</sub> are analyzed using synchrotron radiation. HT-phase is determined to be orthorhombic structure with the space group <i>Pnma</i>, as previously reported; however, the results of Rietveld refinement of HT-phase suggest that there are some Cu sites around saddle points of the double well potential. Phonon dispersion calculated by first-principles calculations indeed exhibits soft phonon modes of the Cu sites, consistent with the Rietveld analysis. The detailed analysis leads to a conclusion that the lower thermal conductivity in HT-phase results from an additional phonon scattering resonated with an anharmonic Cu vibration in the double well potential.

DOI： 10.2320/matertrans.E-M2015804

059 放電過程におけるLi電池正極材料内の応力状態評価

山川俊輔, 長廻尚之, 山崎久嗣, 旭良司, 小山敏幸

計算力学講演会講演論文集 2015 巻 ( 0 ) 頁： _059 - 1_-_059-2_ 2015年

Nitrogen-Doped Titanium Dioxide as Visible-Light-Sensitive Photocatalyst: Designs, Developments, and Prospects 査読有り

Asahi Ryoji, Morikawa Takeshi, Irie Hiroshi, Ohwaki Takeshi

CHEMICAL REVIEWS 114 巻 ( 19 ) 頁： 9824 - 9852 2014年10月

Thermal expansion, diffusion and melting of Li2O using a compact forcefield derived from ab initio molecular dynamics 査読有り

Asahi Ryoji, Freeman Clive M., Saxe Paul, Wimmer Erich

MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING 22 巻 ( 7 ) 2014年10月

Atom-probe tomographic study of interfaces of Cu2ZnSnS4 photovoltaic cells 査読有り

Tajima S., Asahi R., Isheim D., Seidman D. N., Itoh T., Hasegawa M., Ohishi K.

APPLIED PHYSICS LETTERS 105 巻 ( 9 ) 2014年9月

Effect of microstructure on discharge properties of polycrystalline LiCoO2 査読有り

Yamakawa Shunsuke, Yamasaki Hisatsugu, Koyama Toshiyuki, Asahi Ryoji

SOLID STATE IONICS 262 巻頁： 56 - 60 2014年9月

Improvement in Thermoelectric Properties of Se-Free Cu3SbS4 Compound 査読有り

Suzumura Akitoshi, Watanabe Masaki, Nagasako Naoyuki, Asahi Ryoji

JOURNAL OF ELECTRONIC MATERIALS 43 巻 ( 6 ) 頁： 2356 - 2361 2014年6月

Surface segregations in platinum-based alloy nanoparticles 査読有り

Yamakawa Shunsuke, Asahi Ryoji, Koyama Toshiyuki

SURFACE SCIENCE 622 巻頁： 65 - 70 2014年4月

A metathesis reaction route to obtain fine Mg2Si particles 査読有り

Itahara H., Yamada T., Oh S. -Y., Asahi R., Imagawa H., Yamane H.

CHEMICAL COMMUNICATIONS 50 巻 ( 33 ) 頁： 4315 - 4318 2014年

Improvement of the open-circuit voltage of CU2ZnSnS4 cells using a two-layered process 査読有り

Tajima Shin, Itoh Tadayoshi, Hazama Hirofumi, Ohishi Keiichiro, Asahi Ryoji

2014 IEEE 40TH PHOTOVOLTAIC SPECIALIST CONFERENCE (PVSC) 頁： 431 - 434 2014年

Effects of viscosity, surface tension, and evaporation rate of solvent on dry colloidal structures: A lattice Boltzmann study 査読有り

Munekata Toshihisa, Suzuki Takahisa, Yamakawa Shunsuke, Asahi Ryoji

PHYSICAL REVIEW E 88 巻 ( 5 ) 頁： 052314 2013年11月

　前のページ - 次のページ　

1
2
3
4
5
6
7
8
9