This paper researches into enhanced heat transfer of condensation of splitting gas of waste plastics and R113 on the general smooth tubes, the screw tubes and the aculei finned tubes.

本文研究制冷剂r 113和废塑料制汽油过程中产生的裂解气在水平光滑管、螺纹管与“犁刺”管上的冷凝强化传热。发现“犁刺”管的制冷传热效果约为光滑管的14倍，为螺纹管的10倍。

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Alternatively, the paper says part of income tax could be used by splitting the tax into a health tax and a general tax.

BBC: Charles Kennedy

The commission will assess the economic feasibility of splitting up Los Angeles, and look into tricky questions such as water supply that need general co-operation.

ECONOMIST: Troubled cities 1