Swietenia is a genus in the plant family Meliaceae. This genus contains seven to eight known species, found in the tropical and subtropical regions of the Americas and West Africa. Thus far, more than 160 limonoids have been isolated from four species of the genus Swietenia. Limonoids are rich in structure type and biological activity, and these compounds are the main active components in the Swietenia species. This paper will give a comprehensive overview of the recent phytochemical and pharmacological research on the terpenes from Swietenia plants and encourage further drug discovery research.

Polypyrrole/wool composite fiber was prepared by in situ oxidative polymerization from vapor phase and liquid phase pyrrole at room temperature, by using FeCl3 as catalyst. The effect of deposition technique on the surface morphology, mechanical properties and the electrical stability of fibers were discussed. The result showed that deposition technique has a strong effect and fiber prepared by vapor phase deposition has much fine and small granular structure, lower resistance, better mechanical property and electrical stability.

In this paper, the Hamilton theory was applied to describe the dynamic model of Thermal Power Pipeline nonlinear fluid solid coupling vibration. The model includes the control equation of axial vibration and the transverse vibration of the pipeline, taking full account of the vibration characteristics of the fluid in the pipeline, effect of thermal deformation and constant support, as well as the friction coupling, Poisson coupling and junction coupling. The model is an attempt to the heating pipes and need to be further improved.