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以十六烷基三甲基溴化铵(CTAB)为模板剂,采用水热合成法制备了一系列具有高催化活性的Ag3VO4可见光催化剂,对其形貌和结构进行了表征,并以有机染料罗丹明B(RhB)和有机膦类农药草甘膦(PMG)为模式污染物考察了Ag3VO4的光催化性能。结果表明,所制备的Ag3VO4均为单斜相α-Ag3VO4,当CTAB用量为1.0%(SVO-1.0样品)时,对RhB和PMG均表现出良好的光催化活性和稳定性,一级动力学常数分别是未添加CTAB制备的Ag3VO4的1.8倍和4.7倍,同时SVO-1.0还具有更好的稳定性和抗光腐蚀性能。单线态氧和空穴是Ag3VO4催化剂光催化反应中的主要活性物种。 相似文献
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基于非线性扩散滤波的双目视觉跟踪与测量研究实现 总被引:1,自引:0,他引:1
针对双目视觉跟踪与测量技术的研究主要集中在缩短时间,精确性问题考虑不够充分。结合KAZE特征提取算法,利用卡尔曼预测对目标进行跟踪,提出一种基于图像匹配的双目视觉跟踪与测量算法。将KAZE特征提取算法和SIFT、SURF等算法进行仿真对比,结果表明KAZE算法具有更加出色的匹配率,而跟踪速度相当。运用KAZE算法与卡尔曼预测跟踪技术实现了基于Visual Studio环境下的双目视觉测量与跟踪系统,测试结果表明,该系统可进行有效的高精度测量。 相似文献
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To accelerate intense, short pulsed heavy ion beams to the energies of interest for studies of high energy density physics and warm dense matter, the Pulse Line Ion Accelerator (PLIA), of which the axial acceleration gradient can achieve several MeV per meter with realistic helix parameters at very low cost, was developed in recent years. A simple prototype of PLIA for a proof-of-principle experiment called the Lanzhou Test PLIA was designed and constructed at the Institute of Modern Physics in Lanzhou, and the test result matches the calculated result well. The pattern of the axial electric field Ez and the velocity of the traveling wave were simulated by CST. 相似文献
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电子加速器能量脉动的大小是影响电子加速器稳定可靠运行的重要因素之一。利用R-C串联方法测量能量脉动的结果说明电子加速器的能量脉动测量存在磁场干扰。采用有限元法数值计算了电子加速器中高压发生器结构改动前后的磁场干扰值的大小,通过对高压发生器结构的改,最后测量到较真实的能量脉动系数。说明用这种高压发生器的三相电子加速器所产生的能量脉动系数可以满足电子加速器正常工作的要求,可以确定能量脉动系数太大不是加速器在强流工作时稳定性变差的主要原因。 he Ripple coefficient is one of the important factor for the stability of industrial high voltage electron accelerator. Accelerator can’t work well when the ripple coefficient is high. The increment of the measured ripple values becomes very large with the increase of the accelerator load current. From the simulation with finite element method of high voltage generator,we found that the leakage magnetic field was the most important reason for the results of ripple measurement. The ripple was measured after changing the frame of the high voltage generator to suppress the leakage magnetic field. It can be concluded that the actual value is acceptable to the accelerator and the measured high ripple coefficient is not the reason of malfunction of this high power electron accelerator. 相似文献
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