Qualitative and Quantitative Descriptions of Birch Carbonization Surface Micrograph
There are close connections between heated temperature and bitchs micrographs. In this paper, the scanning electron microscope (SEM) images of birch carbonizations prepared under different simulating fire heated temperatures were observed and compared. Besides, tracheid chordwise diameter, tracheid wall thickness and fiber spacing intervals were recorded and analyzed by the software of Semlmage. The results show that as the heated temperature rises, the surfaces of tracheids gradually become smoother, and the cross sections of tracheids change from circular or ovate shape to polygon. The external films of tracheid fibers are damaged and bordered pits are exposed gradually with the increasing of heated temperature. At high temperature, bordered pits change from flat eye-like pores to circular pits. After heated, the average value of tracheid chordwise diameters increases from 10.25μm to 13.82μm, while the average tracheid wall thickness decreases from 3.44μm to 1.00μm, and the average spacing interval between tracheid fibers increases from 7.40μm to 13.07μm. Thus, the problem of connecting wood micrographs with heated temperature quantitatively in fire trace and evidence identification is broken through by the study, and it is helpful to push forward the combination of fire science and other subjects. The result is meaningful to fire investigation.
birch carbonization tracheid heated temperature SEM Semlmage
LIU Ling ZHAO Min ZHANG Shixing
Department of Fire Engineering,Chinese peoples Armed Police Force Academy,Langfang 065000,Hebei,Chi Department of Fire Engineering,Chinese peoples Armed Police Force Academy,Langfang 065000,Hebei,Chi
国际会议
The 2008 International Symposium on Safety Science and Technology(2008年安全科学技术国际会议)
北京
英文
740-744
2008-09-24（万方平台首次上网日期，不代表论文的发表时间）