199,206 research outputs found
Study on the elastic-plastic behavior of a porous hierarchical bioscaffold used for bone regeneration
No full textA perfectly plastic von Mises model is proposed to study the elastic-plastic behavior of a porous hierarchical scaffold used for bone regeneration. The proposed constitutive model is implemented in a finite element (FE) routine to obtain the stress-strain relationship of a uniaxially loaded cube of the scaffold, whose constituent is considered to be composed of cortical bone. The results agree well with experimental data for uniaxial loading case of a cancellous bone. We find that the unhomogenized stress distribution results in different mechanical properties from but still comparable to our previous theory. The scaffold is a promising candidate for bone regeneration
Ottelia songmingensis Z. Z. Li, Q. F. Wang & J. M. Chen
No full textOttelia songmingensis (Z.T. Jiang, H. Li & Z.L. Dao) Z.Z. Li, Q.F. Wang & J.M. Chen, stat. & comb. nov. Basionym:— Ottelia acuminata (Gagnepain) Dandy var. songmingensis Z.T.Jiang, H.Li & Z.L.Dao (2005: 425) Type:— CHINA. Yunnan: Songming County, Heilongtan Spring, elev. ca. 1965 m, on slowly flowing ditches, from 40 cm to 1 m or more deep, 21 August 2003, Z. T. Jiang & Z. L. Dao 221 (♂, holotype KUN!); Z. T. Jiang & Z. L. Dao 222 (♀, paratype KUN!) Distribution and habitat:— Ottelia songmingensis presently is only recorded from Songming County, Yunnan Province, China. It grows along streams, where the water depth is from 40 cm to 1 m or deeper. Note:— This species is close to Ottelia guanyangensis and O. fengshanensis but differs in owing unisexual flowers, long banded leaf and unwinged fruit.Published as part of Li, Zhi-Zhong, Wang, Qing-Feng & Chen, Jin-Ming, 2022, Ottelia songmingensis, a new rank and combination of Hydrocharitaceae from China, pp. 101-102 in Phytotaxa 554 (1) on page 101, DOI: 10.11646/phytotaxa.554.1.9, http://zenodo.org/record/680986
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