智能一体化水面垃圾清理装置

针对现有打捞设备对河流、湖泊等中小型水域的漂浮垃圾清理效率低、清理不彻底的问题,基于树莓派和单片机设计一种以X型杆机构为收集主体的全新水面垃圾清理装置,详细阐述该装置机械结构设计、执行过程和智能化方案。经solidworks建模分析,搭建实物验证后,结果表明可在多种中小型水域环境下对多种垃圾形态进行收集,收集效果可观。     

智能天线中时空虚拟DOA矩阵算法与改进

本文主要研究智能天线中二维DOA估计算法.首先研究时空DOA矩阵估计方法,并进行了仿真.然后结合虚拟阵列变换技术对该算法进行有效的改进一时空虚拟DOA矩阵方法.改进后得到的仿真结果证明了该改进算法可以估计超过阵元数的信号,具有较高的分辨性能和较好的稳健性.     

胶溶-水热晶化过程中纳米TiO2相稳定性研究

The phase stability of nanocrystaline anatase and rutile TiO2 in sols peptized at different temperature has been studied by X-ray Diffraction (XRD) and thermodynamical analysis. The results show that the stability of nanocrystaline TiO2 of different crystal types is a function of particle size. According to the thermodynamical analysis, anatase TiO2 becomes more stable than rutile TiO2 when the particle size is less than ca. 14 nm, which coincides with the experimental data obtained by XRD. Both surface Gibbs free energy and surface stress play important roles in the thermodynamically phase stability. Comparing the data calculated thermodynamically with the experimental results obtained under different temperatures, it is found that the constant K in the function relation, f=KGS, between surface free energy GS and surface stress f is temperature dependent and equal to 1 at 333 K and 2 at 453 K, respectively.