开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(...开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(TC),表现出明显优于单纯水滑石氧化物(LDO)和氮掺杂碳(NC)的催化活性.这是由于壳聚糖作为碳源和氮源的原位引入成功抑制了钴铁金属氧化物团聚,同时N原子的掺杂增强电子转移,协同催化提高活性.研究了催化剂组成、催化剂用量、PMS用量和初始pH值等因素对TC降解效率的影响规律.最佳条件下(PMS用量0.4 g L^(-1),LDO/NC用量0.5 g L^(-1),pH=5),30 min内TC的降解率和总碳去除率分别达到97.8%和81.0%.该催化剂可磁性回收且循环使用五次以上,稳定性保持良好.提供了一种用于催化PMS氧化处理制药废水的绿色催化剂.展开更多
In the process of display, manipulation and analysis of biomedical image data, they usually need to be converted to data of isotropic discretization through the process of interpolation, while the cubic convolution in...In the process of display, manipulation and analysis of biomedical image data, they usually need to be converted to data of isotropic discretization through the process of interpolation, while the cubic convolution interpolation is widely used due to its good tradeoff between computational cost and accuracy. In this paper, we present a whole concept for the 3D medical image interpolation based on cubic convolution, and the six methods, with the different sharp control parameter,which are formulated in details. Furthermore, we also give an objective comparison for these methods using data sets with the different slice spacing. Each slice in these data sets is estimated by each interpolation method and compared with the original slice using three measures: mean-squared difference, number of sites of disagreement, and largest difference. According to the experimental results, we present a recommendation for 3D medical images under the different situations in the end.展开更多
文摘开发用于高级氧化技术的廉价易得、高效稳定的催化剂对于水处理至关重要.以水滑石/壳聚糖为前驱体开发了一种新型“原位沉淀-煅烧”法制备磁性氮掺杂碳负载CoFe_(2)O_(4)-CoO催化剂(LDO/NC).该催化剂用于活化过一硫酸盐(PMS)降解四环素(TC),表现出明显优于单纯水滑石氧化物(LDO)和氮掺杂碳(NC)的催化活性.这是由于壳聚糖作为碳源和氮源的原位引入成功抑制了钴铁金属氧化物团聚,同时N原子的掺杂增强电子转移,协同催化提高活性.研究了催化剂组成、催化剂用量、PMS用量和初始pH值等因素对TC降解效率的影响规律.最佳条件下(PMS用量0.4 g L^(-1),LDO/NC用量0.5 g L^(-1),pH=5),30 min内TC的降解率和总碳去除率分别达到97.8%和81.0%.该催化剂可磁性回收且循环使用五次以上,稳定性保持良好.提供了一种用于催化PMS氧化处理制药废水的绿色催化剂.
文摘In the process of display, manipulation and analysis of biomedical image data, they usually need to be converted to data of isotropic discretization through the process of interpolation, while the cubic convolution interpolation is widely used due to its good tradeoff between computational cost and accuracy. In this paper, we present a whole concept for the 3D medical image interpolation based on cubic convolution, and the six methods, with the different sharp control parameter,which are formulated in details. Furthermore, we also give an objective comparison for these methods using data sets with the different slice spacing. Each slice in these data sets is estimated by each interpolation method and compared with the original slice using three measures: mean-squared difference, number of sites of disagreement, and largest difference. According to the experimental results, we present a recommendation for 3D medical images under the different situations in the end.
