Subconscious Effect on Pedestrian Counter Flow

We propose an extended lattice gas model with different maximum velocities to simulate pedestrian counter flow by considering the subconscious behaviour of walkers. Four types of walkers including faster right walkers, slower right walkers, faster left walkers and slower left walkers are involved in the simulation. The simulation results show that our model can capture some essential features of pedestrian counter flows, such as the lane formation, segregation effect and phase separation at higher densities. We also find that the subconscious effect can reduce the occurrence of jam cluster evidently compared with the ease of un-subeonscious effect. At large maximum velocity, the critical density corresponding to the maximum flow rate of the fundamental diagram is in good agreement with the empirical results.     

LiAlO2衬底上ZnO薄膜的溶胶-凝胶法制备和表征

采用溶胶凝胶法在LiAlO2(302)衬底上制备了ZnO薄膜.用X射线衍射(XRD)和扫描电镜(SEM)对样品的结构和形貌进行了表征.XRD结果表明,随着热处理温度的升高(350℃、450℃、550℃、600℃、800℃),所得到的薄膜分别为单相ZnAl2O4(350℃),ZnAl2O4和ZnO的混合相(450℃)以及单相的ZnO(550℃、600℃、800℃),并且ZnO薄膜c轴择优取向的生长趋势随温度升高相应明显.SEM图像显示,随着热处理温度的升高,ZnO薄膜的粒径相应变大.     

可见光驱动表面富含氧空位Nb2O5催化醇氧化反应

醇氧化合成相应的羰基化合物在有机化学基础研究及工业应用中占有非常重要的地位.通过表面富含氧空位Nb₂O₅光催化剂的开发,发展了一种醇氧化为羰基化合物的绿色高效合成方法.该催化体系具有反应条件温和,底物适用性强和官能团兼容性广的特点.此外,该催化剂表现出优良的性能稳定性,循环使用多次后,保持催化活性不变.