摘要：Tubular hydroforming has attracted increased attention in the vehicle industry recently. This paper covers a complete hydroforming process design for an instrum ent panel frame by finite element simulation using the explicit code LS-DYNA. The manufacturing process for the instrument panel frame consists of tube pre-be nding and final hydroforming. To accomplish hydroforming process design successf ully, a thorough investigation of proper combination of process parameters such as internal hydraulic pressure and axial feeding is carried out by finite element simulation to predict the tube wall thickness and shape. An optimized process parameter combination is obtained and verified by the instrument panel frame hyd roforming experiment. The experiment shows that designed process parameters can be used in real production through FEA simulation, but tubular thinned amplitu de by FEA is less than that with the experiment.

摘要：氢能作为一种清洁能源,已成为全球能源战略的重要组成部分,也是实现全球“碳中和”的必要途径之一.在可再生电力的驱动下,水电解法有望成为实现“零碳”排放的一种理想的长期制氢方法.与传统合金相比,高熵合金由于其独特的结构特征,包括占位无序和晶格有序,可提供更多的催化活性位点.它们在水解催化剂领域具有广泛的应用前景.本文综述了电解水的机理、水解过程中高熵合金的催化原理,以及高熵合金作为电解水催化剂的最新研究进展.总结了新型高熵合金设计方面存在的难点及其应用潜力,重点讨论了高熵合金在水解催化过程中表面形态和催化活性之间的联系.最后归纳了高熵合金的组成调控及其在水电解等新兴领域的可能应用前景.

摘要：The hydrogen leakage detection and alarm processing system is established for the fuel cell (FC) power train lab to meet the hydrogen safety demand of the FC performance test and examination for the project named "Research and Development of the Vehicular technology for the Fuel Cell City Bus" by Tsinghua University. The established hydrogen safety system includes the hydrogen supply system, hydrogen leakage detection system, alarm processing system, ventilation system, measures against electrostatic, thunder-arresting and explosion-protection, and the strict hydrogen operation rules. In this safety system, the explosion proof catalytic combustion sensors are used to detect the hydrogen leakage and the electrical control system is designed to process the alarm automatically. The hydrogen safety system plays an important role in the performance, examination of the FC and the assuring the personnel's safety of the fuel cell power train lab. © by HIGH technology LETTERS PRESS.

摘要：Superhydrophobic 和 superhydrophilic 表面广泛地为工业应用由于他们的重要性被调查了。然而， superhydrophobic 表面是很敏感的加热，这被报导了，紫外(紫外) 轻、电的潜力，它防碍他们的长期的耐久性。在这研究，我们介绍一条新奇途径完成柔韧的 superhydrophobic 由设计定义建筑学的复杂 nanostructures 的薄电影。分别地，有在 mesoporous nanoball 堵住的 1D nanowire 网络， 2D nanosheet 栈，和 3D 的形态学的控制成分体系结构的 ZnO 空 microspheres 的一个家庭经由一个二拍子的圆舞被综合自己组装途径，有特殊设计的结构的 oligomers 或成分 nanostructures 在哪儿，首先从表面活化剂模板形成，然后进一步由第二合作表面活化剂的增加集合了进复杂形态学。由二拍子的圆舞组成的薄电影综合了有不同体系结构的 ZnO 空 microspheres 与 150 猠杵敧瑳 ? 的接触角度介绍了 superhydrophobicities ? 漠楲慧業愠 ?? 慣摮摩瑡 ?

摘要：A series of amino organophosphorus imidazoles were designed and synthesized as a novel structural type of antimicrobial *** evaluation in vitro showed that compound 3f exhibited equipotent or superior anti-methicillin-resistant Staphylococcus aureus(anti-MRSA) and anti-S. cerevisiae efficiencies(minimal inhibitory concentration(MIC)=2 μg/mL) to clinical drugs,and the combinations with antibacterial or antifungal drugs enhanced the antimicrobial efficiency. Highly active molecule 3f showed low propensity for bacteria to develop resistance, and the preliminary action mechanism studies demonstrated that 3f was membrane-active, but had no significant intercalation towards MRSA DNA. The computational study on 3f reasonably explained its high antimicrobial activity. Experimental data revealed that ground-state 3f-HSA complexes were formed mainly through hydrophobic interactions and hydrogen bonds with a spontaneous process, and the non-radioactive energy transfer from HSA to 3f occurred beyond F鰎ster resonance energy transfer theory. The participation of metal ions in 3f-HSA supramolucular system could increase the concentration of free compound 3f, and shorten its storage time and half-life in the blood to improve the maximum antimicrobial efficacy.

摘要：FeS因具有较高的比容量和优异的环境友好性,被认为是一种极具竞争力的锂/钠离子电池负极材料.然而,循环过程中缓慢的电荷转移动力学和较大的体积变化阻碍了它的实际应用.本文通过在超薄FeS/C复合材料中构建应变缓冲(气泡膜状)结构,从根本上解决了FeS动力学缓慢和体积变化大的问题.有限元模拟和非原位透射电镜结果验证了气泡膜状碳基质可作为保护壳层缓解FeS的巨大体积变化,还能提高其电子导电性.得益于这种独特的结构设计,该电极材料表现出显著增强的性能.其在5 A g^(-1)下的储锂容量为469 mA h g^(-1),在1 A g^(-1)下循环1500次后的储钠容量为354 mA h g^(-1).此外,由该电极与LiFePO_(4)正极组装的全电池即使在100次循环后也能提供558 mA h g^(-1)的比容量,展现出优异的循环稳定性.这一策略也可应用于其它导电性差、体积变化大的负极材料,以促进高倍率和长寿命电池的发展.

摘要：A novel compact electromagnetic bandgap （EBG） structure constructed by etching two reverse split rings （RSRs） and inserting interleaving edge （IE） on the patch of conventional mushroom-like EBG （CML-EBG） is investigated. Simulated dispersion diagrams show that the proposed EBG structure presents a 13.6% size reduction in the center frequency of the bandgap. Two comparisons have been carried out for the analysis of the effect of the RSRs and IE configuration. Then, a sample of this novel EBG is fabricated and tested, further experimental data agree well with the simulated results. Thus, this EBG structure makes a good candidate to decrease mutual coupling in compact microstrip patch array.

摘要：推迟的很少层的热传导六角形的硼氮化物(h-BN ) 表试验性地用一个 noncontact micro-Raman 光谱学方法被调查。为单层(1L ) 的一阶的温度系数， bilayer (2L ) 并且九层(9L ) h-BN 表被测量是(当时， electrospinning 准备的 3.41 xide nanofibers 被期望减少了热电导率与体积样品相比。自从它包含复杂样品准备方法，热电导率正在质问的 nanofibers 的大小。在这个工作，我们在场对单个 nanofiber 的热电导率的大小合适的一个新奇方法。一 microelectro 机械(MEMS ) 设备被设计了并且制作了在单个 nanofiber 上执行热传导性大小。一个特殊 Si 模板被设计收集并且转单个 nanofibers 到 MEMS 设备名上吗？

摘要：金属/金属氧化物复合材料凭借其独特的界面和电子结构已被广泛设计合成,并应用于碱性溶液中电催化析氧反应的电催化剂.然而,如何设计并获得丰富的金属/金属氧化物界面和均匀分散的金属相仍是一个挑战.此外,金属和金属氧化物在增强电催化活性方面的协同机理依然不清晰.本文以金属氧化物为基体,通过锂诱导的转化反应,制备了具有丰富界面和优异电接触的金属/金属氧化物复合物,增加了催化活性位点,并加速了电催化反应过程中的传质.利用该方法制备出的NiCo/NiCo2O4,NiMn/Ni Mn2O4和CoMn/CoMn2O4催化剂的析氧性能有显著提升.通过原位X射线吸收光谱和原位拉曼光谱技术,本文探索了复合催化剂的催化机理,揭示了析氧反应中的催化活性中心以及金属与金属氧化物之间的协同作用机理.密度泛函理论+U(DFT+U)计算证实了金属/金属氧化物材料中的金属组分可以优化催化反应路径并降低反应势垒,从而加速电催化动力学.

摘要：物联网技术爆炸式发展,从可穿戴设备到车辆互联,再到智慧城市等方面,正在改变人们的日常生活。过去,人们习惯将雾计算看作云计算的延伸;事实上,雾计算逐渐成为传输、处理分布式大数据的理想解决办法。提出一种考虑拜占庭容错的组网方法,以及两种针对物联网雾计算的资源分配算法。目的是设计一个称作"SIoTFog"的安全雾计算网络,能够抵御拜占庭错误影响并提高传输、处理物联网大数据的效率。考虑两种情况,即面对单一拜占庭错误和多拜占庭错误的不同隐患时,比较算法性能。选择时延、传输时总转发跳数和设备利用率作为性能指标。仿真结果表明,该方法可助力实现高效、可靠的雾计算网络。