Fabrication of large-scale ripples on fluorine-doped tin oxide films by femtosecond laser irradiation

The large-scale uniform self-organized ripples are fabricated on fluorine-doped tin oxide （FTO） coated glass by femtosecond laser. They can be smoothly linked in a horizontal line with the moving of XYZ stage by setting its velocity and the repetition rate of the laser. The ripple-to-ripple linking can also be realized through line-by-line scanning on a vertical level. The mechanism analysis shows that the seeding effect plays a key role in the linking of ripples.     

大学物理课程模块化教学与敏捷教学模式的探索与实践

为保证“中国制造2025”“创新驱动发展”等重大战略顺利实施，国家需要储备大量具有较强创新能力的新兴工程开发及应用人才。高等教育对人才的培养应该服务于国家战略需要，因此，随着人才需求的升级，大学物理课程作为理工科专业的基础课，教学内容、教学模式等也应随之升级。教学内容上要注重与专业学科融合，增加与专业相关的新知识、新技术、新发展的介绍；教学模式上要注重学生知识运用能力和创新能力的培养。本文提出将教学内容划分为基本教学模块和专业个性化教学模块；教学模式上实行敏捷化教学，以问题或项目为导向、以学生能力驱动、学做结合、不断迭代，实现学生实践应用和创新能力的递次提升。     

金属改性P/HZSM-5分子筛催化乙醇芳构化

以P/HZSM-5分子筛为基础, 通过浸渍法制备了Cr、Co、Cu、Zn等金属改性的M-P/HZSM-5分子筛. 采用X射线衍射(XRD), 比表面积(BET)和氨气程序升温(NH₃-TPD)等方法对其进行了表征, 并考察了其催化乙醇芳构化的活性. 结果表明, 改性后的ZSM-5分子筛保持原有的骨架结构, 但比表面积降低, 酸性分布发生变化; Cu-P/HZSM-5分子筛有较高催化活性. P和Cu的负载量分别为3%和5%, 先浸渍P再浸渍Cu, 反应温度400 °C, 质量空速(WHSV)为1.0 h^-1时轻质芳烃(BTX)收率可达到57.6%.     

Controllable grating fabrication by three interfering replicas of single femtosecond laser pulse

The controllable periodic M-shape gratings are fabricated on the surface of silica glass by three coplanar interfering beams from a single femtosecond pulse. The configuration of the M-shape periodic structure is characterized by optical microscopy and atomic force microscopy. The experimental results and the theoretical simulation show that the period and the modulation depth ratio between the neighboring grooves of the fabricated gratings can be controlled by adjusting the collision angles and pulse energy of the three beams, respectively.