著者

Toshiaki INA Yuki ORIKASA Titus MASESE Takayuki NAKAO Atsushi MINESHIGE Koji AMEZAWA Hajime TANIDA Tomoya URUGA Yoshiharu UCHIMOTO

出版者

The Electrochemical Society of Japan

雑誌

Electrochemistry (ISSN:13443542)

巻号頁・発行日

vol.82, no.10, pp.875-879, 2014-10-05 (Released:2014-10-05)

参考文献数

41

被引用文献数

4

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The relationship between the local structure and oxide ionic conduction of Nd2NiO4+δ possessing the K2NiF4 structure was investigated. Various oxygen nonstoichiometry samples of Nd2NiO4+δ prepared with different annealing oxygen partial pressures were examined. The local structure related to oxide ionic conduction was determined by the Nd K-edge extended X-ray absorption fine structure. The oxide ionic conductivity and surface exchange coefficient were estimated using electronic conductivity relaxation methods. The activation energy for the oxide ionic conductivity was found to have a direct correlation to the surface exchange coefficient. The bottleneck size for oxide ion conduction was strongly correlated to the oxide ionic conduction of interstitial oxygen and the oxygen surface exchange rate.

著者

Daisuke Kurata Takahiro Orikasa Yuki Orikasa Shoji Koide

出版者

Japanese Society for Food Science and Technology

雑誌

Food Science and Technology Research (ISSN:13446606)

巻号頁・発行日

pp.FSTR-D-23-00086, (Released:2023-11-02)

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This study was designed to investigate the effects of changes in vacuum microwave (VMW) drying conditions on the drying kinetics, microstructures and physical properties of shiitake mushrooms. Under the tested conditions of 3 kPa and 20 kPa, low pressure and high microwave power in particular increased the rate of moisture change of shiitake mushrooms. Morphological observations from X-ray computed tomography (CT) images showed that samples dried at 3 kPa had many more porous structures with smaller pores, while clumps of cells formed and led to the formation of larger pores in samples dried at 20 kPa. Under the 20 kPa condition, the apparent density increased, and the internal porosity decreased, immediately after drying. These results implied that shrinkage of the samples occurred in the early stages of drying. However, drying at lower pressure led to the dried samples with lower densities and higher internal porosities because of the puffing effect.