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21.
A. V. Vosmerikov B. Ulzii Ya. E. Barbashin L. L. Korobitsina M. Tuya L. N. Vosmerikova 《Petroleum Chemistry》2011,51(2):143-149
The conversion of the straight-run gasoline fraction of high-paraffin crude oil into the high-octane gasoline over niobium-zirconium-aluminosilicate
catalyst with the ZSM-5 zeolite structure has been studied. The influence of the process conditions on the yield, composition,
and performance characteristics of the product gasoline has been shown. It has been found that in the presence of the catalyst,
the required quality of gasoline can be reached by varying the process conditions. Using ammonia thermal desorption and differential
thermal analysis techniques, data on the acid characteristics of the zeolite catalyst and the amount of coke formed on its
surface during the conversion of straight-run gasoline have been obtained. The catalyst operation stability in the model reaction
of methanol-to-hydrocarbons conversion has been estimated. 相似文献
22.
Zernike多项式拟合是一种在光学领域中广泛应用的分析技术.由于现代光学工程中采集数据的离散性和非圆孔径系统的大量使用,Zernike多项式拟合不能完全满足分析需要.提出了一种基于Zernike多项式的非圆孔径离散采样点的正交多项式.通过矩阵的QR分解方法得到在离散采样点上的正交多项式基底.分别使用Zernike多项式和正交多项式对150 mm90 mm的矩形光栅反射波前进行拟合,结果表明两种方法残差波前的PV和RMS值分别相差0.013波长和小于0.001波长.对比不同项数拟合的正交多项式和Zernike多项式系数表明,正交多项式系数之间彼此独立,并由正交多项式系数计算得到了对应的Seidel像差.正交多项式各项系数可以逐项求解,该方法可以显著提高求解速度. 相似文献