含内生硬质碳化物颗粒的金属堆焊层的抗磨性能及磨损机理

利用钛铁(Fe-Ti)、钒铁(Fe-V)、石墨和金红石等组分的电弧冶金反应合成了含TiC和VC硬质碳化物颗粒的金属堆焊层；采用MLD-10型动载荷摩擦磨损试验机考察了金属堆焊层的抗磨性能，探讨了其磨损机理．采用X射线衍射仪和扫描电子显微镜分析了堆焊层的相组成＼微结构及磨损表面形貌．结果表明：含硬质碳化物颗粒的金属堆焊层具有良好的耐磨粒磨损性能，其单位面积磨损质量损失仅为EDZCr-C-15焊条相应金属堆焊层的约1／9；所制备的金属堆焊层基体组织为低碳马氏体，内生硬质碳化物颗粒弥散分布于基体组织中；硬质碳化物颗粒同低碳马氏体基体表现出良好的韧性和硬度复合效果，从而有利于显著提高金属堆焊层的抗磨性能．     

Optimal wavelet filter bank design for image fusion

A novel optimization-based method for designing wavelet filter banks in image fusion is proposed.The filter bank design is formulated as a nonlinear optimization problem.The objective function of the optimization problem consists of both the performance metrics of the image fusion,such as the root mean square error (RMSE),and those of individual filters.The optimization problem is solved using simulating annealing.