... 上表面气孔铸孔 topsurfaceporosity 上表面气孔(铸孔) top surface porosity 晕圈 由于机械加工引起的基材表面上或表面下的破坏或分层现象.通常表现为在孔周围或其它机械加工部位的周围呈现泛白区域 haloing ...
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A porous silk fibroin membrane could be prepared through freeze-drying process, with dense top surface, porous bottom surface in low porosity and porous inner portion in high porosity.
采用冷冻干燥法可以制得下表面为致密结构，上表面为孔隙率较小的多孔结构，而内部是孔隙率较大的多孔结构的丝素膜。
Batch production shows there are no shrinkage cavity and porosity in casting, and no blowholes and sand inclusions on the top surface. The yield of the casting is 81%.
经批量生产验证，铸件内无缩孔、缩松缺陷，上表面无渣孔、气孔缺陷，工艺出品率81%。
Near the décollement structure surface, at the bottom of the Cambrian and the top of the Archean, developed an interjacent fractured zone which shows high porosity and high permeability.
构造破碎带附近古生界底部和太古宇顶部出现破碎带，表现为高孔隙度、高渗透率带。
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