摘要：Anion exchange membrane(AEM)fuel cells have gained great attention partially due to the advantage of using non-precious metal as ***,the reaction kinetics of hydrogen oxidation reaction(HOR)is two orders of magnitude slower in alkaline systems than in *** understand the slower kinetics of HOR in base,two major theories have been proposed,such as(1)pH dependent hydrogen binding energy as a major descriptor for HOR;and(2)bifunctional theory based on the contributions of both hydrogen and hydroxide adsorption for HOR in alkaline ***,we discuss the possible HOR mechanisms in alkaline electrolytes with the corresponding change in their Tafel *** from the traditional Tafel-Volmer and Heyrovsky-Volmer HOR mechanisms,the recently proposed hydroxide adsorption step is also discussed to illustrate the difference in HOR mechanisms in acid and *** further summarize the representative works of alkaline HOR catalyst design(e.g.,precious metals,alloy,intermetallic materials,Ni-based alloys,carbides,nitrides,etc.),and briefly describe their fundamental HOR reaction mechanism to emphasize the difference in elementary reaction steps in alkaline *** strategy of strengthening local interaction that facilitates both H2 desorption and Hads+OHads recombination is finally proposed for future HOR catalyst design in alkaline environment.

摘要：数字化背景下如何让先进技术更好地适应儿童的身心特征,已成为儿童早教玩具创新的核心问题。增强现实技术因其具备连接虚拟与现实、提供深入互动体验的特点,在儿童早教玩具领域有着显著的应用优势。为给学龄前儿童提供更好的寓教于乐体验,将增强现实技术引入早教玩具创新设计。通过分析现有增强现实早教玩具的市场现状,总结了现有产品的不足与未来增强现实早教玩具的发展方向,结合学龄前儿童生理、心理和认知三方面特征以及家长需求,从音乐启蒙角度对增强现实早教玩具提出设计策略,最终进行基于增强现实技术的儿童音乐启蒙早教玩具的设计实践,为信息化时代下儿童早教玩具创新提供一种新思路。

摘要：数字化景观设计作为智慧乡村建设的重要组成部分,通过综合运用现代数字技术,对乡村景观进行智能化、精准化的规划与设计,不仅能提升乡村环境的美观度和实用性,还能促进乡村生态、经济、社会的全面协调发展。笔者从智慧乡村的视角出发,分析了数字化景观设计的技术特点,探讨了数字化景观设计在乡村振兴中的应用以及面临的挑战与对策,期望本研究能为推进智慧乡村发展、加快农村现代化进程提供有益参考。

摘要：在转向架构架的结构可靠性分析中,可变载荷工况的失效概率有利于提高结构的合理性。本研究利用有限元分析(FEA)和试验(DOE)的结果,建立了转向架构架可靠性的多项式响应面(PRS)代理模型。基于应力强度干涉理论,建立了转向架构架在变载工况下的功能函数,在此基础上提出了一种考虑不确定性因素的多项式响应面代理模型(PRS-update)来表征设计参数和响应之间的函数关系,并采用子集仿真(SS)方法计算其失效概率,将单峰和双峰边界引入转向架构架的结构可靠性分析中,通过与蒙特卡洛模拟(MCS)结果进行比较,验证了PRS-Update模型在分析转向架结构可靠性的准确性。

摘要：Anodic urea oxidation reaction(UOR)is an intriguing half reaction that can replace oxygen evolution reaction(OER)and work together with hydrogen evolution reaction(HER)toward simultaneous hydrogen fuel generation and urea-rich wastewater purification;however,it remains a challenge to achieve overall urea electrolysis with high ***,we report a multifunctional electrocatalyst termed as Rh/Ni V-LDH,through integration of nickel-vanadium layered double hydroxide(LDH)with rhodium single-atom catalyst(SAC),to achieve this *** electrocatalyst delivers high HER mass activity of0.262 A mg^(-1) and exceptionally high turnover frequency(TOF)of 2.125 s^(-1) at an overpotential of100 m ***,exceptional activity toward urea oxidation is addressed,which requires a potential of 1.33 V to yield 10 mA cm^(-2),endorsing the potential to surmount the sluggish *** splendid catalytic activity is enabled by the synergy of the Ni V-LDH support and the atomically dispersed Rh sites(located on the Ni-V hollow sites)as evidenced both experimentally and *** selfsupported Rh/Ni V-LDH catalyst serving as the anode and cathode for overall urea electrolysis(1 mol L^(-1) KOH with 0.33 mol L^(-1) urea as electrolyte)only requires a small voltage of 1.47 V to deliver 100 mA cm^(-2) with excellent *** work provides important insights into multifunctional SAC design from the perspective of support sites toward overall electrolysis applications.

摘要：波长可调谐外腔半导体激光器在片上全光通信和片上光子器件互连集成中发挥着至关重要的作用。采用两个半径不同的微环谐振器和两种不同结构的马赫-曾德尔干涉仪,设计了一种基于厚度为700 nm的氮化硅波导的外腔反射镜,并采用大马士革工艺制作了外腔反射镜。结合Ⅲ-Ⅴ族反射型半导体光放大器和可调谐氮化硅外腔反射镜,通过对移相器热电极电压、可调耦合器热电极电压和微环谐振器热电极电压等参数进行调节,获得了最大调谐范围为55 nm、边模抑制比超过40 dB的外腔半导体激光器。

摘要：以植物的开花生热现象创设情境,引导学生通过提出问题、分析问题、解决问题的科学探究过程,利用给出的真实科学研究素材,逐步探索开花生热的原因、实质及机制。在此过程中复习细胞呼吸相关知识,巩固生命观念中的物质与能量观、信息观,提升科学思维与科学探究能力,逐步形成主动探索未知事物的科学态度。

摘要：研究设计了一种能够对瓶盖进行全自动激光打标的机构。机构包含瓶盖输送机构和瓶盖打标机构两大部分,其中瓶盖打标机构包含上料装置、打标传输装置及下料装置。上料装置利用电动滑台搭建龙门式结构,实现X、Y、Z三轴精确定位,采用真空吸盘对瓶盖进行吸取上料;打标传输装置采用圆盘式回转机构进行送料,设计槽轮机构实现间歇转动,控制打标时间;下料装置采用气缸推动真空吸盘,进行拾取,并放入下料箱中,瓶盖打标全过程实现了自动化。

摘要：文中详述了行业气象服务中,通过对接CIMISS(China Integrated Meteorological Information Service System)及云平台应用实现的数据服务和可视化服务流程。文中通过替换非公开国家站数据及观测要素不同范围的随机偏移保障了气象观测数据的安全性;在对接CIMISS时,通过对不同类型的数据设计对应的补调流程,保证了服务数据和数据源的高度一致性;最后,在稳定统一的底层数据环境基础上,根据交通行业用户的需求,采用B/S模式设计实现了交通三要素展示系统,为行业用户提供了较好的数据和服务支持,切实提高了行业用户的决策效率。

摘要：针对架空线路检测中因线路摇摆造成作业机器人轨迹偏移的问题,结合带电作业机器人运动学模型,提出一种面向架空线路低幅摆动的作业机械臂路径修正算法。首先选择改进RRTstar算法对作业机械臂路径进行规划;其次在架空线路出现低幅摇摆时,通过正逆运动学方程进行偏差计算;最后根据偏差值进行路径的二次规划,从而实现导线低幅振动下的作业机械臂路径修正。试验表明,改进RRTstar算法在2 s内的规划成功率可达100%,且规划与执行作业的平均耗时更短,更贴近导线摇摆的实际路线。