Iterative filtered ghost imaging

It is generally believed that, in ghost imaging, there has to be a compromise between resolution and visibility. Here we propose and demonstrate an iterative filtered ghost imaging scheme whereby a super-resolution image of a grayscale object is achieved, while at the same time the signal-to-noise ratio (SNR) and visibility are greatly improved, without adding complexity. The dependence of the SNR, visibility, and resolution on the number of iterations is also investigated and discussed. Moreover, with the use of compressed sensing the sampling number can be reduced to less than 1% of the Nyquist limit, while maintaining image quality with a resolution that can exceed the Rayleigh diffraction bound by more than a factor of 10.     

异辛酸稀土型柴油清净剂的合成和应用研究

对异辛酸镧的合成工艺进行了系统的研究,研究表明异辛酸镧的最佳合成条件为:反应温度80℃,反应时间20 min,皂化率为80%,在此条件下稀土的转化率可达99.98%。通过模拟台架试验和柴油发动机尾气排放试验,考察了其对柴油发动机各部件沉积物的清净效果和改善柴油发动机有害排放情况。模拟台架试验表明,在柴油中添加300×10-4%异辛酸镧清净剂后,柴油发动机低温部件积炭的产生量降低74.8%,同时形成一种彩色膜,可有效阻止沉积物的生成;柴油发动机尾气排放试验表明它可将尾气中CO的排放量降低49.4%,同时NOx的排放量也降低34.2%。     

相转移催化合成对苯乙炔聚合物(PPV)发光材料中间体1，4 二乙氧基苯的研究（PartⅠ）

近年来二烷氧基取代对苯乙炔聚合物(PPV)发光功能材料广泛应用于液晶彩电、电脑、飞机彩色液晶显示屏中,本文研究了利用相转移催化反应在不同的催化剂反应条件下,合成二烷氧基取代对苯乙炔聚合物(PPV)发光功能材料的中间体1,4-二乙氧基苯,在氢氧化钠及催化剂HA-1存在下,对苯二酚与硫酸二乙酯于60～65℃反应3h条件下合成1,4-二乙氧基苯,产品收率达84%以上.对不同的催化剂的使用和反应时间进行了条件优化,对产品1,4-二乙氧基苯的IR谱图、1 H-NMR谱图进行了确认和详细分析.