以滤纸为模板合成新型介孔生物活性玻璃微管材料

用快速滤纸为生物模板,通过先浸渍后焙烧的方法合成了介孔生物活性玻璃微管材料。快速滤纸的管状结构被完美复制,其管壁为生成的介孔生物玻璃材料。通过在合成过程中引入铁元素可以使材料具有一定的磁性。材料的形貌、结构和磁性通过扫描电镜、粉末X射线衍射、透射电镜、氮气吸附-脱附曲线,红外光谱和磁滞回线进行了表征。并且通过模拟体液浸泡方法考察了其矿化能力,以地塞米松为模型药物考察其释药能力和生物相容性。合成的介孔生物活性玻璃微管材料具有复杂的管状多级结构、快速的矿化能力和良好的生物相容性,并具备一定的磁性,是一种不可多得的药物缓释材料。     

Wronskian Form Solutions for a Variable Coefficient Kadomtsev–Petviashvili Equation

Starting from a simple transformation, and with the aid of symbolic computation, we establish the relation- ship between the solution of a generalized variable coefficient Kadomtsev-Petviashvili （vKP） equation and the solution of a system of linear partial differential equations. According to this relation, we obtain Wronskian form solutions of the vKP equation, and further present N-soliton-like solutions for some degenerated forms of the vKP equation. Moreover, we also discuss the influences of arbitrary constants on the soliton and N-soliton solutions of the KPII equation.     

Cross Soliton-Like Waves for the （2＋1）-Dimensional Breaking Soliton Equation

We construct a two-soliton-like solution for the （2＋1）-dimensionai breaking soliton equation. The obtained solution contains two arbitrary functions and hence can model various cross soliton-like waves including the two-solitary waves. We show the evolution of some special cross soliton-like waves diagrammatically.     

以滤纸为模板合成新型介孔生物活性玻璃微管材料

用快速滤纸为生物模板,通过先浸渍后焙烧的方法合成了介孔生物活性玻璃微管材料。快速滤纸的管状结构被完美复制,其管壁为生成的介孔生物玻璃材料。通过在合成过程中引入铁元素可以使材料具有一定的磁性。材料的形貌、结构和磁性通过扫描电镜、粉末X射线衍射、透射电镜、氮气吸附-脱附曲线,红外光谱和磁滞回线进行了表征。并且通过模拟体液浸泡方法考察了其矿化能力,以地塞米松为模型药物考察其释药能力和生物相容性。合成的介孔生物活性玻璃微管材料具有复杂的管状多级结构、快速的矿化能力和良好的生物相容性,并具备一定的磁性,是一种不可多得的药物缓释材料。     

波长相关物理成像模型的交通监控图像去雾算法

针对当前去雾算法未考虑交通监控图像中雾气浓度分布不均匀的问题,提出了波长相关物理成像模型的去雾算法.首先,根据波长与雾气浓度的相关性,构建了适用于交通监控图像的波长相关物理成像模型.然后,根据波长与颜色的相关性,设计出基于最大模糊相关图割的透射率估计算法.考虑到灰度值存在交叉重叠的模糊特性,及景物的空间相关性,利用递推的最大模糊相关算法快速获取景物划分信息,并用此信息设计图割的数据项,实施图割.该策略将基于阈值的分割算法与基于空间相关性的图割算法相结合,确保了景物的空间相关性,提高了分割精度,避免白色目标的误分.最后,通过分割结果中的天空区域,准确地计算大气光,实施去雾.在500幅仿真图像及真实图像上的测试结果表明,该算法较已有去雾算法的去雾精度至少提高7%,运行时间至少缩短了约15%,可用于交通监控系统的图像去雾处理中.     

Anti-Control of Hopf Bifurcation in the Chaotic Liu System with Symbolic Computation

The anti-control of bifurcation refers to the task of creating a certain bifurcation with particular desired properties and location by appropriate controls. We consider, via feedback control and symbolic computation, the problem of anti-control of Hopf bifurcation in the chaotic Liu system. We propose an anti-control scheme and show that compared with the uncontrolled system, the anti-controlled Liu system can exhibit Hopf bifurcation in a much larger parameter region. The anti-control strategy used keeps the equilibrium structure of the Liu system and can be applied to generate Hopf bifurcation at the desired location with preferred stability. We illustrate the etticiency of the anti-control approach under different operating conditions.