CaF2-doped ZrO2： A base catalyst for synthesis of dimethyl carbonate     

王慧  时森  王瑶  李长顺  孙俭 《上海大学学报(英文版)》2010,14(4):281-285

The effect of CaF2-doped ZrO2 catalyst for the synthesis of dimethyl carbonate （DMC） was studied by X-ray diffraction （XRD）, CO2-temperature programmed desorption （TPD）, Raman spectra, and X-ray photoelectron spectroscopy （XPS）. Catalytic performance was evaluated in the bath and distillation reactors. Results showed that the CaF2/ZrO2 catalysts had activity and stability for DMC synthesis.  相似文献   

基于MATLAB的最小二乘曲线拟合     

时鑫  时森  何长征 《中国科技纵横》2010,(20):7-8

本文主要介绍了最小二乘曲线拟合方法的基本思路,并通过编制MATLAB程序对测量数据进行了一阶拟合和二阶拟合,实现了拟合多项式系数的求解。  相似文献   

Effective and inexpensive gas chromatography method for detection of trace level SO₂ in H₂ fuel     

王慧  李长顺  周丽  时森  王瑶  孙俭 《上海大学学报(英文版)》2010,14(5):322-325

Gas chromatography （GC） analysis of sulfer dioxide is challenging because SO2 is a highly mobile and chemically active molecule. For the conventional GC method with flame photometric detector （FPD） and direct-injection, it is often ineffective particularly when the SO2 level is as low as on the trace level. In this paper, a modified GC system integrated with an adsorption-desorption device was developed to detect the trace SO2 impurity in H2 fuel. Adsorbent GDX-502 is used in the adsorber to adsorb/collect SO2 from the sample gas and desorb/release it in a concentrated flow so that the conventional GC at downstream could detect it with an acceptable accuracy.  相似文献