Search

Abstract: Aim of this study was to prepare Bu-Yang-Huan-Wu (BYHW) elementary osmotic pump sustained-release tablets and to investigate the situation of its main effective components of “synchronous control and sustained release.” The releasing similarity of chromatographic fingerprints of BYHW in vitro dissolution was evaluated. The results showed that BYHW elementary osmotic pump sustained-release tablet was prepared and the chromatographic fingerprints were extracted. And data of its release similarity was also obtained. It was concluded that BYHW elementary osmotic pump sustained-release tablet can achieve the synchronous control and sustained release of many ingredient. It is also fit for the characteristic of Chinese herbal medicine compound. [Copyright &y& Elsevier]

It is well recognized that vorticity and vortical structures appear inevitably in viscous compressor flows and have strong influence on the compressor performance. However conventional analysis and design procedure cannot pinpoint the quantitative contribution of each individual vortical structure to the integrated performance of a compressor such as the stagnation-pressure ratio and efficiency. We fill this gap by using the so-called derivative-moment transformation, which has been successfully applied to external aerodynamics. We show that the compressor performance is mainly controlled by the radial distribution of azimuthal vorticily, of which an optimization in the through-flow design stage leads to a simple Abel equation of the second kind. The satisfaction of the equation yields desired circulation distribution that optimizes the blade geometry. The advantage of this new procedure is demonstrated by numerical examples, including the posterior performance check by 3D Navier-Stokes simulation. [ABSTRACT FROM AUTHOR]