Efficient visible light driven photocatalytic removal of NO with aerosol flow synthesized B, N-codoped TiO2 hollow spheres

In this study, we demonstrate that aerosol assisted flow synthesized B, N-codoped TiO(2) photocatalyst possesses superior photocatalytic activity to pure and single element doped counterparts on the degradation of NO in a flow system under both simulated solar light and visible light irradiation. Characterization results revealed that B, N-codoped TiO(2) photocatalyst was composed of hollow microspheres. Boron and nitrogen were in the form of Ti-O-B and N-Ti-O structures, respectively. The introduction of B and N into the TiO(2) lattice could effectively tune the band gap of TiO(2) and extend its optical response to the visible-light region. The synergistic effect of B and N codoping on visible light driven photocatalytic activity enhancement of TiO(2) was discussed on the basis of experimental results.     

Crystallization Behavior of Zr_(55)Al_(10)Cu_(30)Ni_5 Bulk Metallic Glass Rolled at Room Temperature

Zr 55 Al 10 Cu 30 Ni 5 bulk metallic glass was rolled up to 95% in thickness reduction at room temperature, and the dependences of microstructure and thermal stability on the strain were investigated. It is revealed that phase transformations do not occur during the rolling, but the split of the crystallization peaks becomes more and more obvious with increasing thickness reduction. Analyses of the radial distribution functions and the pair correlation functions indicate that the rolling has enhanced the sh...     

Thermal Stability and Transformation-mediated Deformability of Cu-Zr-Al-Ni Bulk Metallic Glass Composite

The glass-forming ability and the thermal stabilityof Cu45Zr45Al5Ni5 metallic glass were systematically investigated by the differential scanning calorimetry.The activation energies for the glass transition and the onset crystallization and the crystallization peak were calculated to be 255.1,308.7 and 311.5 kJ/mol,respectively,while the corresponding liquid fragility was determined to be 23.4.By controlling the casting process,Cu45Zr45Al5Ni5 bulk metallic glass composite with the presence of ductile B2 CuZr phase was fabricated.The composite shows a pronounced plastic strain of 6.8 0.05% with obvious work hardening,which results from the formation of multiple shear bands and the deformation-induced martensitic transformation.     

Sol-gel nanocasting synthesis of patterned hierarchical LaFeO3 fibers with enhanced catalytic CO oxidation activity

Hierarchical LaFeO3 fibers were prepared by a sol-gel nanocasting method using a cotton cloth as the template. The resulting LaFeO3 fibers inherited the initial network morphology of the template very well and showed enhanced catalytic CO oxidation activity and satisfactory stability compared to the counterpart particles prepared by the conventional sol-gel method.     

基于蚁群算法的无人船平滑路径规划

为解决无人驾驶船舶在复杂环境中规划路径时存在的转向角度大、路径拐点多、航行能耗高等问题,文中提出一种基于改进蚁群算法的平滑路径规划方法。该方法采用栅格法进行环境建模,通过在启发函数中引入路径平滑度、距离启发因子以及在路径转移概率中引入障碍物启发因素,提高路径寻优和静态避障能力。结合启发因素改进信息素更新标准,设置可调节信息素挥发因子增加算法的自适应性。提取输出的最优路径关键节点并对其进行平滑处理,进一步保证路径平滑度和安全性。根据不同栅格环境下的避障仿真结果可知,与传统算法相比,文中改进蚁群算法的路径寻优速度提高了45%～62%,转向次数减少了25%～44%,平滑处理后的路径安全性和可行性得到了提升,较好地实现了不同环境下无人船自主路径规划。     

MSIMCNN: Multi-scale inception module convolutional neural network for multi-focus image fusion

The aim of image fusion is to obtain a clear image by combining useful information coming from multiple images. However, the fused image usually has the problem of artifacts and unclear boundary. To address these problems, a deep convolutional neural network based framework for multi-focus image fusion is proposed in this paper, called multi-scale inception module convolutional neural network (MSIMCNN). MSIMCNN converts the entire image into a binary mask to estimate the focus characteristics, and obtains the clear boundary between focus and defocus. First of all, a pair of focus images and the corresponding feature images detected by the Laplace operator are inputted into the network. The Laplace operator can detect the edge and gradient of focus in the image, which can help us accurately reconstruct the focused area in the focus map and distinguish the focus and defocus boundaries. Then, in the feature extraction stage, different scales of convolution kernels are designed to extract the rich and complementary features at different scales of the source images. At the same time, the inception module is added to increase the width of the network and reduce the parameters, which can extract more focus features required for image reconstruction and reduce the complexity. Finally, the focus map of the source image pair can be obtained in the feature reconstruction stage. In this stage, an efficient method is proposed to make the focus mask, which is used for the calculation of the loss function and the generation of the training set. The experimental results on different data sets confirm the superiority and effectiveness of MSIMCNN compared with other methods.

     

Rapid catalytic microwave method to damage Microcystis aeruginosa with FeCl3-loaded active carbon

In recent years, effective methods for cyanobacterial blooms treatment have been an important issue. In this study, we demonstrated a rapid catalytic microwave method to deal with Microcystis aeruginosa with FeCl(3)-loaded active carbon. Microcystis aeruginosa damage process was monitored by measuring optical density, chlorophyll-a content, superoxide dismutase activity, l-glutathione content, and turbidity of the treated Microcystis aeruginosa suspension. It was found that this method could quickly and efficiently induce the degradation of Microcystis aeruginosa. On the basis of control experiments and characterization results, we attributed the excellent catalytic performance to the synergy effect between hole-doping of the catalyst and hot spot of microwave irradiation. This work provides a fast and green treatment method for cyanobacterial blooms.     

搅拌速度对铝合金表面电镀Ni-SiC的影响

主要以硫酸镍、氯化镍、磷酸和碳化硅为基本组分的镀液,通过采用电镀法在铝合金基体上获得Ni-SiC复合镀层,着重探讨搅拌速度对铝合金表面电镀Ni-SiC的影响,并得出最佳的搅拌速度.结果表明:搅拌速度对镀层性能有很大影响,当搅拌速度为300r/min时,镀速最大,而且镀层均匀、紧凑、细小,耐腐蚀性能良好,镀层中SiC含量也达到最大.