“泛90后”用户心智模型引导下的旅游App界面设计

随着移动互联网的应用市场不断扩大,旅游App逐渐成为大众旅游所依赖的工具,在旅游App市场稳步增长的同时,“泛90后”群体逐步成为当今旅游消费的主力军。本文先对“泛90后”用户心智模型的概念、特性及构建方法进行研究分析,并提出相应的设计原则,后结合相关设计实践总结“泛90后”用户心智模型引导下旅游App界面设计策略。验证了心智模型应用于旅游App设计领域的可行性,研究获取到的“泛90后”用户心智模型为旅游App提供可供参考的设计策略,同时也为未来设计者提供新的思路。

CO2加氢制乙醇的化学热力学与动力学分析

化学热力学和动力学是物理化学课程的重要组成部分,该部分内容概念较为抽象,学生在学习过程中比较困难。我们以CO2加氢制乙醇的物理化学过程分析为例,阐述了化学热力学与动力学的联系与区别,为学生深入认识和理解物理化学课程提供了有力指导。

覆盖度在物理化学教学中的探讨

覆盖度是物理化学课程中表面现象部分的重要概念,对学生认识吸附过程,深入理解固体表面的化学反应具有重要的指导意义。然而在教学活动中由于学时限制等因素,对覆盖度概念的讲解不够深入,致使学生不能全面深刻理解该概念。本文以具体事例讲述覆盖度的影响因素及其重要作用,为学生深入理解覆盖度的概念提供了有力的支撑。

Ultrafast laser-chemical modification hybrid fabrication of hydrostatic bearings with a superhydrophobicity solid-liquid interface

Oil film vortex severely reduces the stability of hydrostatic bearings. A solid-liquid interface with drag and slip properties can weaken the oil film vortex of the bearing. Here, a combined picosecond laser ablation and chemical modification method is proposed to prepare surfaces with microbulge array structure on 6061 aluminum alloy substrates. Because of the low surface energy of the perfluorododecyltriethoxysilane modification and the bulge geometry of the microbulge array structure, the surface shows excellent superhydrophobicity. The optimum contact angle in air for water is 164°, and that for oil is 139°. Two surfaces with “lotus-leaf effect” and “rose-petal effect” were obtained by controlling the processing parameters. The drag reduction properties of superhydrophobic surfaces were systematically investigated with slip lengths of 22.26 and 36.25 μm for deionized water and VG5 lubricant, respectively. In addition, the superhydrophobic surface exhibits excellent mechanical durability and thermal stability. The proposed method provides a new idea for vortex suppression in hydrostatic bearings and improves the stability of bearings in high-speed operation.

Lattice Boltzmann study on the effects of surface nanostructure on wettability with application in laser scanning fabrication of superhydrophobic surfaces

Nanostructured surfaces with dimensions on a scale of a few millimeters exhibit remarkable hydrophobicity.The geometry of these nanostructures considerably affects their wettability.However,determining the optimal geometry is challenging due to the abundance of geometry parameters and the difficulty in numerically describing their effects on wettability at the mesoscopic scale.In addition,the fabrication of nanostructured surfaces with precise geometries is challenging.We establish a lattice Boltzmann method(LBM)model to address these challenges.We use the model to gain mesoscopic insights into the interaction between droplets and nanostructures.Our model can accurately reproduce contact angles(CAs)on various nanostructured surfaces and enables investigation of the effects of nanostructure geometry on wettability.We optimize the geometry of the nanostructures using the insights provided by the LBM model on the wettability mechanisms.Our analysis indicates that cones with dimensions of 40μm in width and 33μm in height exhibit the highest hydrophobicity.We successfully fabricate a superhydrophobic surface with the desired geometry via laser scanning,achieving a CA of 163°.We believe that this approach,which combines the LBM model and laser manufacturing,will enable a better understanding of the wettability mechanism and provide a high-performance approach for fabricating superhydrophobic surfaces.

Laser cutting of thermoplastic film:Mechanism and processing technology

The mechanism of ultraviolet(UV) nanosecond laser cutting of thermoplastic films and the influence of process parameters on process quality are systematically discussed.The photothermal effect plays a dominant role in the interaction between the UVnanosecond laser and thermoplastic materials.In this photothermal reaction,a heat source with the focal point as the core is formed,around which a thermal carbonization layer,a thermal melting layer,and a thermal expansion layer are formed in order from the inside to the outside.Among them,the thermal carbonization layer is not prevalent,and the thermal melting layer and thermal expansion layer are prevalent.The process quality can be adjusted by adjusting the cutting speed,the laser power,and the repetition number of cuts to regulate the process of heat generation and heat dissipation.In the effective range,the faster the cutting speed and the lower the laser power,the smaller the kerf width and heat-affected zone(HAZ) width.Within a certain range,the depth of kerf can be increased by increasing the repetition number of cuts.