摘要：Regulating chemical bonds to balance the adsorption and disassociation of water molecules on catalyst surfaces is crucial for overall water splitting in alkaline *** we report a facile strategy for designing Ni2W4C-W3C Janus structures with abundant Ni-W metallic bonds on surfaces through interfacial *** Ni atoms into the W3C crystals in reaction progress generates a new Ni2 W4C phase,making the inert W atoms in W3C be active sites in Ni2W4C for overall water *** Ni2W4CW3C/carbon nanofibers(Ni2 W4-W3C/CNFs)require overpotentials of 63 mV to reach 10 mA cm^-2 for hydrogen evolution reaction(HER)and 270 mV to reach 30 mA cm^-2 for oxygen evolution reaction(OER)in alkaline electrolyte,*** utilized as both cathode and anode in alkaline solution for overall water splitting,cell voltages of 1.55 and 1.87 V are needed to reach 10 and 100 mA cm^-2,*** functional theory(DFT)results indicate that the strong interactions between Ni and W increase the local electronic states of W *** Ni2W4C provides active sites for cleaving H-OH bonds,and the W3C facilitates the combination of Hads intermediates into H2 *** in situ electrochemical-Raman results demonstrate that the strong absorption ability for hydroxyl and water molecules and further demonstrate that W atoms are the real active sites.

摘要：分析了鸭嘴移栽机栽植机构的工作原理与过程,建立了七杆栽植机构的运动学模型。借助MATLAB软件对数学模型进行求解,对相关参数进行了优化计算,得到了主要参数的最佳组合,并模拟出栽植点的作业轨迹曲线,对栽植点运动轨迹特点进行了研究,从而直观地分析其作业性能。研究表明,所设计的七杆栽植机构具有良好的移栽性能,能满足移栽作业的农艺要求,为移栽机设计中栽植机构的运动参数和结构参数的确定提供了依据。

摘要：第一代中碎反击式破碎机存在出料粒型针片度偏高,反击板、均整板调节保护装置调节不方便,均整板保护装置可靠性较低,壳体剖分面和结构设置不当导致运输成本高、狭小空间安装适应性差等问题。升级开发的新一代TKPFM型中碎反击式破碎机改进了均整板主体结构,将物料接触面的原平缓衬板改为锯齿状齿条,提高了物料研磨均整效率;将机械式的反击板调节结构和均整板调节保护装置改为液压式,缩短了调节时间,提高了过异物保护可靠性;将壳体侧部和端部改为螺栓连接,优化剖分面,减小了设备拆解后的最大件容重比,运输安装更加便利。多个项目实际应用情况表明,新一代TKPFM型中碎反击式破碎机性能更加优良,运维更加方便,运输成本更低,安装适应性更强。