著者

Masaomi Nangaku Takashi Kadowaki Hiroshi Yotsuyanagi Norio Ohmagari Moritoki Egi Junichi Sasaki Tetsuya Sakamoto Yoshinori Hasegawa Takashi Ogura Shigeru Chiba Koichi Node Ryo Suzuki Yasuhiro Yamaguchi Atsuko Murashima Norihiko Ikeda Eriko Morishita Kenji Yuzawa Hiroyuki Moriuchi Satoshi Hayakawa Daisuke Nishi Atsushi Irisawa Toshiaki Miyamoto Hidetaka Suzuki Hirohito Sone Yuuji Fujino

出版者

Japan Medical Association / The Japanese Associaiton of Medical Sciences

雑誌

JMA Journal (ISSN:2433328X)

巻号頁・発行日

vol.4, no.2, pp.148-162, 2021-04-15 (Released:2021-05-07)

参考文献数

69

被引用文献数

7

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In 2020, the COVID-19 pandemic has had unprecedented impacts on various aspects of the world. Each academic society has published a guide and/or guidelines on how to cope with COVID-19 separately. As the one and only nationwide association of academic societies that represent medical science in Japan, JMSF has decided to publish the expert opinion to help patients and care providers find specifically what they want.This expert opinion is a summary of recommendations by many academic societies and will be updated when necessary. Patients that each academic society targets differ even though they suffer from the same COVID-19, and recommendations can be different in a context-dependent manner. Readers are supposed to be flexible and adjustable when they use this expert opinion.

著者

Takuya Kataoka Yuhi Yasuhira Eiji Fujii Tomohiko Yoshioka Satoshi Hayakawa

出版者

The Ceramic Society of Japan

雑誌

Journal of the Ceramic Society of Japan (ISSN:18820743)

巻号頁・発行日

vol.131, no.9, pp.569-574, 2023-09-01 (Released:2023-09-01)

参考文献数

29

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In this study, the impact of chitosan (CS) on Mg2+ incorporation into hydroxyapatite (HAp) was investigated. Initial Mg/(Ca+Mg) ratios of 0–0.15 resulted in Mg-incorporated HAp containing CS (CMgHAp), while a ratio of 0.2 yielded amorphous calcium phosphate containing CS. Mg/(Ca+Mg) and (Ca+Mg)/P molar ratios of the obtained CMgHAp particles were lower than those of Mg-incorporated HAp particles without CS, suggesting that Mg incorporation into HAp was suppressed by CS. Initial Mg/(Ca+Mg) ratio of 0.025 led to CMgHAp particles with lower specific surface area than HAp particles containing CS, while ratios of 0.05–0.15 led to particles with higher specific surface area. Transmission electron microscopy showed aggregated particles of CMgHAp, since the observed particle sizes were larger than the crystallite sizes of CMgHAp calculated using X-ray diffraction patterns. Analyses of Fourier transform infrared spectroscopy confirms the interaction of CS with the phosphate group in Mg-incorporated HAp. Calcination of the CMgHAp particles decreased the particle size and increased the specific surface area due to decomposition of CS, indicating that CS aggregated Mg-incorporated HAp particles.

著者

Satoshi Hayakawa Ken'ichiro Tanaka

出版者

The Japan Society for Industrial and Applied Mathematics

雑誌

JSIAM Letters (ISSN:18830609)

巻号頁・発行日

vol.12, pp.21-24, 2020 (Released:2020-04-17)

参考文献数

8

被引用文献数

1

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We give a mathematical analysis of potential-theoretical numerical integration formulas mainly proposed by Tanaka et al. over weighted Hardy spaces, which are spaces of analytic functions with a certain decay. We investigate the case of choosing sampling points by discrete energy minimization. In order to bound the convergence rate of the numerical integration error, we make use of the recent result of Hayakawa and Tanaka on the function approximation formula.