This primary bone is characterized by immature bone trabeculae which are aligned along the direction of traction exerted by the periodontal fibers. Secondary bone can be identified by its osteon-like ...

同时，建立了从宏观（10-2 m 量级）到微观（10-4 m 量级）的多层有限元模型，聚焦腰椎皮质骨的动力学特性，详细定义了骨单位（osteon，由哈弗斯管、骨板介质和黏合线等组成）的结构和参数1。 设定边界条件与接触设置：在宏观模型中，添加 40kg 质量点模拟人体 ...

Department of Mechanical Engineering, Politecnico di Milano, Via La Masa, 1, 20156 Milano, Italy Department of Chemistry, Materials and Chemical Engineering “Giulio Natta”, Politecnico di Milano, ...

Powered flight has evolved separately in three tetrapod clades: pterosaurs, birds (avian dinosaurs), and bats. To meet the challenges of powered flight, tetrapods acquired structural, mechanical, and ...