PML吸收边界条件中的角点处理方法

在波动方程的数值模拟中,有限区域建立人工边界吸收边界条件,其中对计算区域角点的处理也是不能忽视的一个问题。PML是一种新的吸收边界条件,这种吸收边界条件几乎达到零反射。重点讨论在使用PML边界条件时,针对计算区域的不同的划分方法做了比较,从而在实际应用中得到更好的数值结果。     

A meta-analysis of the effects of statins on serum C-reactive protein in Chinese population with coronary heart disease or hyperlipidemia

There is little doubt that statins reduce cardiovascular events more than what the lipid lowering effect can account for. Additional mechanisms have been postulated including the anti-inflammatory effects manifested by reduced C-reactive protein （CRP）. It is not known, however, whether statins can decrease CRP in Chinese population. The aim of this study is to investigate the effects of staUns on serum CRP in Chinese patients with coronary heart disease （CHD） or hyperlipidemia. Trials were retrieved through Medline （1980 to May, 2009）, bibliographies, and the author＇s reference files limited to English-language articles. Data were extracted and meta-analysis was performed. Analysis showed statistically significant reduction in CRP after statin treatment （weighted mean difference [WMD] = -0.73, 95% confidence interval [Cl] = [-0.80, -0.66], P 〈 0.00001） and lower CRP after statin treatment than non-statin routine treatment （[WMD] = -0.52, 95% Cl [-0.86, -0.18], P = 0.002）. In conclusion, statins significantly reduce serum CRP in Chinese population, which may contribute to statin-induced reduction in the cardiovascular risk in addition to the lipid lowering effect.