The purpose of this study is to analyze the pore structure for the heartwood, intermediate wood, and sapwood sections in three species of softwood (hinoki, Douglas fir, and hemlock) and to investigate the correlation of gas permeability depending on pore structure. For this study, gas permeability and pore size were measured by capillary flow porometry, and classification of a novel method was performed to determine the type of pores (through pores, blind pores, and closed pores) based on International Union of Pure and Applied Chemistry (IUPAC). Gas permeability, through pore porosity, and pore size increased from heartwood to sapwood. The results of multiple regression analysis showed that through pore porosity, mean pore size, and bulk density were significant factors affecting gas permeability.

中文翻译：

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三种软木（扁柏，花旗松和铁杉）的孔隙结构随气体渗透率变化的实验研究

这项研究的目的是分析三种软木（h木，花旗松和铁杉）心材，中间材和边材截面的孔隙结构，并研究取决于孔隙结构的透气性的相关性。在本研究中，通过毛细管流动孔隙率法测量了气体的渗透性和孔径，并根据国际纯粹与应用化学联合会进行了分类，以确定新的孔类型（通过孔，盲孔和闭孔） （IUPAC）。从心材到边材，通过孔隙率的透气性和孔径增加。多元回归分析的结果表明，通过孔隙率，平均孔径和堆积密度是影响透气性的重要因素。