The hole expansion effect of soil is studied by means of digital image technique.
利用数字图像技术，再现了沉桩挤土效应。
In KP1 type perforated brick masonry, expansion bolt especially design for perforated brick is prefer, because it can form "self- anchor" effect and hold tightly in brick hole.
KP1型矩形条孔烧结页岩多孔砖砌体墙上应采用空心砌体专用膨胀螺栓，因其能够形成可靠的“自螺母效应”。
The effect of hole size on nonlinearity and dispersion of the photonic crystal fiber(PCF) is analyzed by the plane wave expansion method.
采用平面波展开法，研究了气孔尺寸对光子晶体光纤色散特性和非线性的影响。
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