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We study the formation of spatial solitons in an SBN: 75 photorefractive crystal by a 532 nm continuous-wave laser beam. The output beam from the crystal cannot be compressed proportionally to the voltage of the applied electric field. Quasi-steady-state spatial solitons are formed instantaneously at a voltage of 900 V. Interestingly, the quasi- steady-state solitons exhibit a periodic behavior consisting of formation/broken/reformation cycles. If we increase the input intensity of the soliton beam but keep the same signal-to-background intensity ratio, the solitons stay for a longer time in the quasi-steady state and a longer period of soliton formation/broken/reformation cycle is also observed. 相似文献
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Epoxidation of allyl chloride with H_2O_2 on Ti-ZSM-5 prepared by the isomorphous substitution 总被引:1,自引:0,他引:1
The epoxidation of allyl chloride with H2O2 on Ti-ZSM-5 prepared by isomorphous substitution of HZSM-5 with TiCl4 gas was studied. The results show that Ti-ZSM-5 has a high catalytic efficiency for the epoxidation of allyl chloride. The H2O2 utilization reaches 99.50% when the allyl chloride/H2O2 molar ratio is > 1. The effect of solvent species, catalyst concentration, H2O2 and allyl chloride concentration and reaction temperature on the epoxidation was investigated simultaneously. It is found that methanol is the best solvent for the reaction. The reaction rate equation with v = k[Cat. ] [H2O2]1/2-[C3H5Cl] and the apparent activation energy with Ea = 63.462 kJ/mol are obtained according to the kinetics study. 相似文献
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本文采用非同时读出条件下两波耦合实验装置,以532 nm的单频固体激光器为光源,在不同写入光夹角θ、抽运光的偏振方向与e偏振光的方向呈10°、信号光为e偏振光及不同信号光与抽运光光强比条件下,通过改变写入光在Ce∶KNSBN晶体内的不同位置研究其对两波耦合有效增益的影响。研究结果表明,在相同角度下写入光强比为1∶10,写入光在晶体内位置d=0.1 cm时最佳,有效增益达到最大。在最佳写入光位置,写入光强比为1∶10时,在写入光夹角为24°时两波耦合有效增益为最大。并对实验结果进行了理论拟合与分析。 相似文献
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后处理温度对Ti-ZSM-5载钛量和催化苯乙烯氧化反应的影响 总被引:6,自引:1,他引:5
采用TiCl4气固相同晶取代法合成Ti-ZSM-5分子筛,研究了后处理温度对Ti-ZSM-5分子筛中载钛量的影响,发现分子筛的功钛量随后处理温度的升高而增大,并存在一线性关系,该分子筛催化苯乙烯/H2O2反应的活性在载钛量为1.6%(后处理温度为500℃)时出现最大;用IR,XPS,UV-Vis,XRD等方法对Ti-ZSM-5分子筛进行了表征,发现IR光谱在970cm^-1处吸收峰强度并不与分子筛载钛量成线性关系;XPS,UV-Vis证明用该法所载的钛含有部分非骨架钛。 相似文献
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