apertural

Keywords coal-bed methane,surface free energy,apertural struction,adsorption at supercritical temperature;

煤层气;超临界吸附;表面自由能;孔径结构;

the sexine and nexine are separated and form remarkable vestibulum.Uunder the optical sect ion view, nexine thickens in the apertural region.

光学显微镜下，4-5孔，孔的结构特殊，内、外层到孔边分离，形成显著的孔室。

Beam quality characterization of super-Gaussian beams passing through a spherically aberrated lens with an annular rectangular apertur

超高斯光束经光阑球差透镜后的光束质量评价

apertural bar

口栅{拉}

relative apertur

相对孔径

iris apertur

可变光圈, 可变光阑