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Three new ent-abietanoids, named xerophilusins XIV-XVI, and four known analogues, as well as four known chemical constituents were isolated from the leaves of Isodon xerophilus. Their structures were elucidated by extensive spectroscopic studies, and comparison with literature data. In addition, the cytotoxic activity of the ent-abietanoids against chronic myelogenous leukemia (K562), stomach adenocarcinoma (MKN45), and hepatocellular carcinoma (HepG2) human cell lines was investigated and no activities were observed.

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Condensate pipe vibration in the air cooling system was analyzed. The flow pattern discrimination parameters were obtained through carrying out the iterative calculation on the continuity equation and flow equation. It was proposed to use the flow analysis method to determine pipe diameter and arrangement in the design, and to use the static and dynamic analysis methods to determine pipe support settings. These analysis methods are effective to actual engineering design proved by an example. Finally this paper puts forward the improvement measures to prevent condensate pipe vibration.

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