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Surface Characterization of Carbon Fibers as Anode Materials for Li Secondary Batteries
Takamura, Tsutomu,Awano, Hidekazu,Ura, Tetsuya,Ikezawa, Yasunari 한국분석과학회 1995 분석과학 Vol.8 No.4
Pitch-based mesophase carbon fibers prepared at different temperatures were heat-treated at temperatures lower than those of the preparation and the electrochemical Li doping/undoping characteristics were evaluated in relation to the data of IR, mass, etc. Presence of surface hydroxyls were confirmed by FTIR for lower temperature sample which showed poor anode characteristics. Upon oxidative heating, removal of surface hydroxyls took place, resulting in a remarkable improvement of the electrode characteristics. At the same time, surface roughening took place, which was confirmed by SEM and double layer capacity measurements. In situ mass spectra obesrved during the heat-treatments showed gas evolution of $H_2O$, CO, $CO_2$, $C_2H_4$, and/or $H_2$ depending on the conditions. These data together with those of weight loss and conductivity provided us a valuable information in regard to the evaluation of the electrochemical characteristics.
( Daisuke Takamura ),( Kentaro Iwata ),( Tatsuya Sueyoshi ),( Tadashi Yasuda ),( Hideki Moriyama ) 대한슬관절학회 2021 대한슬관절학회지 Vol.33 No.-
Background: Physical activity is associated with physical function; however, the relationship between early physical activity after total knee arthroplasty (TKA) and postoperative physical function remains unclear. The purpose of this study was to evaluate the association of early physical activity after TKA with postoperative physical function. Methods: Timed Up and Go test (TUG) of 47 patients was assessed preoperatively and at 10 days, 3 months, and 6 months postoperatively. Physical activity from the second to the ninth day after TKA was measured with accelerometer, and the correlation with pre- and postoperative physical function was evaluated . A multiple linear regression was used to predict TUG at 6 months after TKA. Results: Postoperative physical activity correlated with preoperative TUG (ρ = -0.485, p < 0.001), TUG at 10 days (ρ = -0.675, p < 0.001), 3 months (ρ = -0.441, p < 0.01), and 6 months (ρ = -0.368, p < 0.05) after surgery. Multiple linear regression indicated that only the preoperative TUG was associated with TUG at 6 months. Postoperative physical activity was not an independent factor predicting TUG at 6 months after TKA. Conclusion: Our study demonstrated that patients with better physical function have higher physical activity in the early postoperative period, whereas it does not affect physical function at 6 months after TKA. In the early postoperative period, increasing physical activity may not always be necessary to improve postoperative physical function. We also confirmed that preoperative physical function affects postoperative physical function. These findings may be beneficial in improving rehabilitation programs in the early postoperative period.
다카무라료헤이 ( Takamura Ryohei ) 한국사회사학회 2006 사회와 역사 Vol.0 No.72
This paper attempts to review the experiences of the Japanese soldiers who stayed in Jejudo during the end of the Pacific War. Three former Japanese soldiers-Kobayashi, Kamiki, Nakahara-are my considerations. I did oral testimonies for Kobayashi and Kamiki, and I used Nakahara``s writings. I also used oral history and literature as the documents which recorded the experiences of the individual in this paper. Among their experiences, I am especially concerned about how three experiences-military equipment and tendency of them, the relationship between them and Koreans, the end of a war differently appeared to them. It is said the soldiers of the unit which Kobayashi belonged to were old and they were not well in training. But, the units which Kamiki and Kobayashi belonged to were in field training. Kobayashi and Kamiki said that the Korean soldiers in their units were good relationship with villagers in Jejudo, but, Nakahara wrote in his book that it was worthwhile to surveil the activities of the villagers after the end of the war. Their experiences are different each. We need to conside the variety of the experiences even under situation which demands collective behavior like war. But, this paper argues that in case of the Japanese Army, the unit of the company is important. The experience of the ordinary soldier was limited within the company, and it was the unit that recognized the personality which the company was attached the nickname. And, one thing that I want to argue is the difference between the subjects in this paper and until now, there are a lot of oral history in this field. Jejudo was not in such extreme situation because there was not actual battle during the Pacific War. Former Japanese soldiers have written a lot of their experiences let alone the common subjects for the oral history. But, since Jejudo did not become the battlefield, their experiences in Jejudo during the war were remarked in very short in Kobayashi and Nakahara``s writings. We can find that the oral history is useful to review the experiences of the individuals not only under the extreme situation or experiences but also dubious situation or position.