著者

馬渕 清資 藤江 裕道 佐納 義久

出版者

一般社団法人 日本機械学会

雑誌

日本機械学会論文集 A編 (ISSN:03875008)

巻号頁・発行日

vol.58, no.551, pp.1068-1072, 1992-07-25 (Released:2008-02-21)

参考文献数

20

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In the present study, the relationship between the femoral head diameter and the body weight of animals is shown. The diameter of femoral heads of fifteen terrestrial mammalian animals were measured directly from their skeletons. The body weight of these animals was referred from literature. Additionally, both the mean values of the femoral head diameters and the body weights of Japanese adult men and women were referred from the literature. The logarithm of femoral head diameter of these animals were plotted against the logarithm of body weight. The positive correlation was significant (p<0.01). The gradient of the regression line was 0.29. It showed that femoral head diameter is proportional to (body weight) 0.29. By analysis, we showed that this relationship can be deduced from the condition of uniform contact pressure or uniform performance of squeezed-film lubrication.

著者

山崎 雅史 木戸秋 悟 藤江 裕道 三好 洋美

出版者

一般社団法人 日本生物物理学会

雑誌

生物物理 (ISSN:05824052)

巻号頁・発行日

vol.61, no.6, pp.389-391, 2021 (Released:2021-11-25)

参考文献数

10

著者

甕 紘介 中島 翔 菊池 俊紀 藤江 裕道

出版者

一般社団法人日本機械学会

雑誌

年次大会講演論文集

巻号頁・発行日

vol.2004, pp.143-144, 2004

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The frictional characteristics of earthworms were determined using a 3D micro force plate developed in our laboratory. It was possible to measure the frictional force and vertical force applied to the force plate. Earthworms, named "Eisenia fetida" and "Pheretima hupeiensis" in Japanese, were used to determine their frictional behaviors when they moved on waterproof sand papers fixed to the force plate. The coefficient of static friction of Eisenia fetida against the sand papers were 6.9, 5.7, and 3.9, at the roughness of 2.98, 3.73, and 16.2 μm, respectively, with a significant difference (p<0.05) observed between the roughness of 2.98 and 16.2 μm. The coefficient of friction of Pheretima hupeiensis against the sand papers indicated a smilar trend as to Eisenia fetida, with a significant difference observed between the roughness of 2.98 and 16.2 μm. Note that the coefficient was significantly higher in Pheretima hupeiensis than in Eisenia fetida at the roughness of 2.98 μm. Mucous liquid secreted from earthworms was observed on the surface of the roughness of 2.98 and 3.73 μm after the friction test. Microscopic observation indicated that earthworms had many spikes called "seta" around their bodies and that they controlled the length of the seta during the movement on an irregular surface. These results indicate that earthworms control their frictional behavior in response to various surfaces that they contact by the use of their mucous liquid and seta They also indicate that the mucous liquid plays more important role than the seta in controlling the frictional behavior of earthworms in response to relatively smooth surfaces.

著者

南斉 亮佑 中村 憲正 藤江 裕道

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.76, no.769, pp.2340-2344, 2010-09-25

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We have been developing a new tissue engineering technique for cartilage repair using a scaffold-free tissue engineered construct (TEC) bio-synthesized from synovium-derived mesenchymal stem cells. A round-chondral defect of 8.5mm in diameter and 1.5mm in depth created on the medial condyle of 12 month-old mature porcine femur was filled with the TEC. Six months after surgery, a cylindrically shaped specimen of 4mm in diameter and 4-5mm in depth was extracted. Micro-indentation test was performed on the specimen using an AFM after the surface image of the specimen was obtained. Macro-scale compression test was, then, performed for the specimen using a custom made micro compression tester. As compared with many bump-like elevated portions of approximately 1-2μm in height observed in the surface of normal cartilage, rougher surface was observed in the TEC-treated and TEC-untreated tissues. The surface stiffness of the TEC-treated tissue was significantly lower than that of the normal cartilage, and slightly lower than that of the TEC-untreated tissue with no significant difference. In the quasi-static compression test, the tangent modulus of the TEC-treated tissue indicated no significant difference against the normal cartilage. In contrast, the tangent modulus of the TEC-untreated tissue was lower than those of the normal cartilage and the TEC-treated tissue, with a significant difference against the normal cartilage. It is suggested that the surface stiffness was independent of treatment of TEC, while the bulk modulus recovered well in the TEC-treated cartilage-like tissues as compared with the TEC-untreated cartilage-like tissues.