Based on volume averaging theory, natural convection model for melting phase change in porous media was established.

根据体积平均理论，建立多孔介质中融化相变过程自然对流模型。

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Carbon dioxide is a minor but important constituent of the atmosphere, averaging about 0.03% or 300 PPM by volume.

二氧化碳是空气的含量较小但很重要的组成成分，体积比平均约为0.03%或300ppm。

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The two year old Market Vectors Brazil Small Cap (BRF) is getting there, with volume averaging around 300, 000.

FORBES: Despite Near Zero Volume, Direxion to Keep Leveraged BRIC ETFs

The Allianz ADR sees volume averaging 278, 000 shares a day.

FORBES: These Stocks Sidestep Sarbanes-Oxley Idiocies

Volume on EWJ is averaging 4.9 million shares, higher than the ETFs for iShares MSCI Brazil (EWZ), Market Vectors Russia (RSX), Wisdom Tree India (EPI) and the iShares FTSE China (FXI) fund.

FORBES: Where Japan Is Shifting Investor Demand