We also assemble a set of permeability testing equipment, by which we study on the effect of density, thickness and air pressure on the relative permeability.

并利用自行组装的测试设备研究了柔性石墨板密度、厚度以及空气压力差对相对透气系数的影响。

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The effects of oxidation time on the density, thickness and corrosion resistance of the micro-arc oxidation coatings of MB8 magnesium alloy were investigated.

研究氧化时间对MB8镁合金氧化膜致密度、厚度和耐蚀性的影响，分析不同氧化时间膜层表面微观形貌、成分和结构的变化。

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Porosity, surface density, thickness, flow resistance, structure factor and other factors affect the sound absorption coefficient.

孔隙率，面密度，厚度，流阻，结构因数因素综合影响其吸声系数。

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Often the strength, density or thickness of a structure is dictated by the largest forces it has to withstand.

ECONOMIST: MONITOR

One-hundred-and-two holes have been dug so far and 1, 100 measurements have been made of ice thickness, snow density and other features - data deemed vital by scientists evaluating the future of the Arctic sea-ice.

BBC: Arctic team gives up on ice radar