摘要：金属纳米团簇作为凝聚态物质的最初始形态,在物质由原子、分子向宏观材料转变过程中起着关键作用.现代科学表明,当金属纳米颗粒的尺寸接近其费米波长时,强烈的量子局限效应将导致金属形成离散的电子能级,这种具有分裂能级的金属纳米颗粒亦被称为金属纳米团簇.因此,对于纳米团簇的结构以及性质的探索,不仅可以揭示出纳米颗粒的量子局限效应与其理化性质之间的量子化学规律,而且为设计具有特定性能的金属材料提供理论指导与奠定实验基础.

摘要：Surface tailoring of Pt-based nanocatalysts is an effective pathway to promote their electrocatalytic performance and ***,we report two kinds of one-dimensional(1D)ultrafine PtCu nanowires(smooth surface&rugged surface)synthesized via a wet chemical method and their distinct catalytic performances in electro-oxidation of *** alloyed PtCu nanowires having rough surfaces with atomic steps exhibit superior catalytic activity toward multiple electrochemical reactions compared with the smooth *** functional theory simulations show the excellent reactivity of rugged PtCu na-nowires and attribute it to the surface synergetic Pt-Cu site which accounts for the promotion of water dissociation and the dehydrogenation of the carboxyl *** current study provides an insight into reasonable design of alloy nanocatalysts in energy-related electrocatalytic systems.

摘要：对V362车型制件托架拼板国产化模具进行了研究和工艺分析,使用特殊设计理念和合理布局及完善的切边冲孔思路,达到了工业化生产的基本要求。将切边等3道工序的内容合并为一道工序,减少了模具数量,并使用侧斜楔侧冲孔侧修边,方便了制件操作,从而使操作中节约了成本,提高竞争力。