column density

基本解釋

When underbalanced drilling or drilling easy leaky zone by using aeration fluid, the determination of fluid density and downhole fluid column pressure is very important.
利用氣體型流體進(jìn)行欠平衡鉆井，或鉆易漏地層時(shí)，流體密度及井下液柱壓力的確定十分重要。
A linear relationship between the density gradient a nd height in a density gradient column was established and the calculation formula for solutions in the National Standard was modified.
針對(duì)塑料密度這一重要的物性參數(shù)的密度梯度法測(cè)定，從理論上對(duì)影響密度梯度柱配制過(guò)程的各個(gè)方面進(jìn)行了分析；對(duì)密度梯度與高度的線性關(guān)系進(jìn)行了理論的推導(dǎo)；
Results show the minimum wetting rate changes with the stacking manner but does not with the packing size, and our developed model is available for determining the spray density of packed column.
結(jié)果表明，填料塔的最小潤(rùn)濕速率與填料大小無(wú)關(guān)，而與堆積方式有關(guān)。

Moreover, with the exception of the continent's handful of natural resource-rich, low population-density countries like Angola (see my September 9, 2008 column advocating an intensified strategic engagement with the geopolitically significant Southern African country), most of America's would-be partners are constrained by lack of the financial wherewithal to upgrade their capabilities to meet even short-term priorities.
CENTERFORSECURITYPOLICY: A stimulus for African security

柱密度
The HeⅠrequires a column density of hydro-gen in an HⅡregion of greater than 1020 cm-2.
HeⅠ的吸收線強(qiáng)度比要求大于10~(20) cm~(-2)的氫柱密度。