Polyphenylalkane derivatives Q 0720Studies on the Lanthanum-Induced Pinacol Coupling of Aromatic Aldehydes and Ketones in Aqueous Media. -Ultrasound irradiation can efficiently prompt pinacol coupling of aldehydes in acidic aqueous media in the presence of La. In contrast, aromatic ketones show much lower reactivity due to the steric hindrance around the carbonyl group. -(BIAN*, Y.-J.; YU, X.-G.; PENG, H.
A finite element method was developed to reveal the thermal characteristics of concrete with a cooling pipe, and the influence of cooling pipe on thermal field was calculated by the coupled fluid flow and solid heat transfer method. Temperature distribution along the pipeline was calculated and the mean Nusselt numbers on each section in the cooling pipe also were obtained. Numerical results show that the flow field and the temperature distribution were very complexly and the heat transfer was severely attenuated in the bend position, the outboard temperature of pipe was higher than the inboard temperature. In addition, in order to study the effect of the cooling pipe on thermal distribution, the temperature of different positions at the hydration time were compared with the no cooling results. The present results could be helpful to predict the temperature cracks in structure engineering.
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