摘要：Sluggish kinetics of anodic hydrogen oxidation reaction(HOR)in alkaline media,which arises from the two orders of magnitude lower HOR activity in alkali than that in acid media for platinum group metals,hinders the commercial implementation of anion exchange membrane fuel cells(AEMFCs).Consequently,the development of platinum-based catalysts combined with high efficiency and durability is urgently ***,we report a facile route for the synthesis of ternary PtRuTe alloy nanofibers with Pt atomic ratio of only 11%via a simple galvanic replacement *** optimize the adsorption strength of platinum and ruthenium towards hydrogen and hydroxyl species by regulating the electron donation from tellurium to platinum and ***,the obtained trimetallic alloy catalyst exhibits an impressive kinetic current density of 30.6 ma cm^(−2)_(geo) at 50 mV and an exchange current density of 0.426 ma cm^(−2)_(metal),which shows 3.0-and 2.5-fold enhancement compared with the commercial Pt/C in alkaline electrolyte,***,the catalyst also demonstrates excellent stability with merely 5%activity attenuation after 2000 potential *** work offers new pathways to boost alkaline HOR by rationally designing multicomponent alloys.

摘要：我国沥青路面长期性能研究总体可以分为四个阶段,即初期的自发分散式研究、原交通部/交通运输部资助的一期和二期科技项目研究以及当前基于北京足尺环道的集中式研究,在机理揭示、材料开发、结构形式、性能测试、施工技术、检测方法、评价指标、性能预估与养护手段等方面取得了良好成效与进展.但是,我国不同区域的沥青路面使用寿命差异较大、实际寿命达不到设计寿命的情况依然普遍存在,主要原因在于我国长期性能研究多集中于小规模的试验路段,全国覆盖率偏低,气候分区宽泛.

摘要：为设计一款能准确测量脉冲大电流的罗氏线圈,根据罗氏线圈的结构特点和工作原理,建立罗氏线圈等效电路模型进行了仿真模拟,分析了不同电磁参数对罗氏线圈测量结果的影响,设计了相关样品进行测试。仿真与测试结果表明:电磁参数对罗氏线圈的性能存在较大影响,建立的罗氏线圈等效电路模型可以根据需求很好地指导产品设计,仿真与试验结果吻合良好,证明所设计的罗氏线圈可以对脉冲放电电流进行有效准确的测量。

摘要：光催化技术能够将CO_(2)转化为有价值的烃类化合物,为解决化石燃料短缺和全球变暖问题提供了新的途径。然而,传统半导体光催化剂由于比表面积小和吸附CO_(2)能力不足,效果有限。g-C_(3)N_(4)凭借其无毒、高稳定性和低成本特性,在光催化领域备受关注。尽管纯g-C_(3)N_(4)的光催化效率受到光生电子/空穴对快速复合、比表面积小和光吸收不足的制约,但通过与大带隙半导体形成异质结构,g-C_(3)N_(4)的电荷分离、比表面积和光吸收能力得到了显著增强。这种基于g-C_(3)N_(4)的异质结构包括半导体支持型、炭材料支持型、非金属支持型以及金属有机骨架支持型,它们在CO_(2)光转换中展现出巨大潜力。然而,改性g-C_(3)N_(4)基异质结构在CO_(2)光转换中仍面临挑战,需要进一步的研究和设计创新。这篇综述强调了基于g-C_(3)N_(4)的异质结构在环保且可持续的CO_(2)还原方法中的重要作用。

摘要：现有的石窟表面风化程度评估多使用人工局部测量方法,这种方法存在效率较低且评估结果易受主观因素影响等问题,鉴于此,提出了一种多光谱成像与随机森林算法相结合的石窟表面风化智能量化评估方法。通过多光谱成像提取的石窟表面光谱信息对风化类型及风化程度进行表征;利用多光谱特征数据重组和标准化处理建立训练、测试及预测样本;基于最小相对熵理论设计损失函数,训练随机森林算法模型,提取不同风化类型及风化程度样本数据的光谱特征;利用训练后具有特征感知能力的分类模型对石窟多光谱图像每个像素点的风化类型及风化程度进行智能预测评估;使用混淆矩阵和Kappa系数对评估结果进行精度评价。以陕西省延安市清凉山万佛寺万佛窟为例对所提方法进行验证,实验结果表明:目标石窟表面强盐析风化区域所占比例为5.15%,弱盐析风化区域所占比例为27.88%,微盐析风化区域所占比例为27.39%,积尘风化区域所占比例为39.58%,评估结果与实际风化状况基本一致,评估的准确率为98.49%,Kappa系数为0.98。所提方法可以实现像素级的精细化评估。

摘要：It is known that structural optimization may lead to designs of structures having low stability and sometimes even kinematically unstable designs. This paper presents a robust design method for improving the stability of opti mized structures. A new approach is proposed, in which cer tain perturbation loads are introduced and the corresponding compliance is added to the objective function as a penaliza tion. The stability of the optimized structures can thus be improved substantially by considering structural responses to the original and the introduced loads. Numerical exam ples show the simplicity and effectiveness of the proposed method.

摘要：The current research of complex nonlinear system robust optimization mainly focuses on the features of design parameters, such as probability density functions, boundary conditions, etc. After parameters study, high-dimensional curve or robust control design is used to find an accurate robust solution. However, there may exist complex interaction between parameters and practical engineering system. With the increase of the number of parameters, it is getting hard to determine high-dimensional curves and robust control methods, thus it＇s difficult to get the robust design solutions. In this paper, a method of global sensitivity analysis based on divided variables in groups is proposed. By making relevant variables in one group and keeping each other independent among sets of variables, global sensitivity analysis is conducted in grouped variables and the importance of parameters is evaluated by calculating the contribution value of each parameter to the total variance of system response. By ranking the importance of input parameters, relatively important parameters are chosen to conduct robust design analysis of the system. By applying this method to the robust optimization design of a real complex nonlinear system-a vehicle occupant restraint system with multi-parameter, good solution is gained and the response variance of the objective function is reduced to 0.01, which indicates that the robustness of the occupant restraint system is improved in a great degree and the method is effective and valuable for the robust design of complex nonlinear system. This research proposes a new method which can be used to obtain solutions for complex nonlinear system robust design.

摘要：依据感性工学理论,结合眼动实验、语义差异法(SD法)和统计分析方法,总结出文化创意类产品感性评价的方法.以龙舟赛奖杯作为文化创意产品的样本,通过对用户的调研数据进行整理与综合对比分析,探讨受测试者的认知差异与文化创意产品设计方案的感性认知之间的联系.研究表明,眼动实验与语义差异法相结合的设计评价方法具有较好的客观性和可操作性,并能为文化创意类产品的设计评价提供参考.

摘要：在公共艺术专业教学中,对"艺术观念"的培养直接影响学生的审美水平和创作能力。本文围绕这一教学目标设计教学方法,从"风格"和"观念"之间的逻辑关系出发,以研究"风格"作为切入点,引导学生进行艺术创作,帮助学生完成从观念培养到创作实践的转化。

摘要：创意是一种创造性的思维活动,是意识与潜意识相互转化的过程,是一个不断创新构想的过程,是广告策略的延伸;创意不是策划的图形化和文字化,更不是制作技术,而是在紧张思考、努力探索的基础上,由有关事物的触发而突然闪现出的一种顿悟,是在高度紧张思维后注意力转移的结果,是经长期思考后偶然得之的意念;创意是旧元素的重新组合。