牦牛胫骨多级微孔参数化描述

A parametric description of yak tibia’s multilevel microporous

经过若干世纪的选择进化,生物功能陶瓷牦牛胫骨的细观结构高度优化。通过SEM方法观测牦牛胫骨断面的微观形貌,发现多孔形态特征非常明显。对SEM图像进行数字化处理,实现具有较高灰度级分辨率的计算机视觉,借助MATLAB编程统计出孔的个数524,通过计算孔像素面积与骨断面的像素面积之比获得孔隙率0.063。分析获得牦牛胫骨的孔径随着水平级别的变化规律曲线,曲线趋向并收敛于0。获得孔径随个数的变化规律曲线,对其曲线进行多项式拟合获得了9阶函数表达式,描述了牦牛胫骨多级微孔分布的内在规律。

Through untold centuries of evolutionary development,a function bioceramic,yak tibia,has become a highly optimized structure suited to a variety of demanding duties. In this study,the cross-section’s porous morphology of yak tibia was observed by SEM. The image processing for higher gray-scale resolution was used to identify the porosity and other structure characteristics. By a MATLAB program the porous number was counted as 524,and the porosity defined as the ratio of porous pixel area to cross-section area was computed as 0.063. It was found that the porous radius varies along with level rank and the curve weakens near to zero. A 9th-order polynomial expression was fitted from the varying curve of porous radius along with number,which characterizes the multilevel microporous distribution of yak tibia.