摘要：Morphology,distribution,composition,forming ability,structural stability and intrinsic mechanical properties of the intermetallic compounds(IMCs)formed in steel/aluminum laser welding were determined through scanning electron microscope,energy dispersive spectrometer,X-ray diffractometer and first-principles *** was found that the mechanical properties of the joint are limited by the Fe−Al IMCs,whose brittleness is attributed to the orbital hybridization between Al(s),Al(p)and Fe(d).However,the joint properties are improved by adding interlayer,which is ascribed to some changes of electronic structure of the generated *** transition mechanism of IMCs changing from brittle to ductile is mainly due to the weak ability of interlayer elements to attract *** mechanical properties of the joint are closely related to the ductility or brittleness of the ***,the addition of Ti foil interlayer effectively improves the mechanical properties of the joints,which means that the experimental verification is in good agreement with the theoretical calculation predictions.

摘要：从研究性教学角度出发,以培养应用型人才为导向,设计了仿生矿化膜的制备及性能测试的综合聚合物共混改性实验教学项目。本实验通过油相中PDMS低聚物的聚合与反向微乳液中氧化石墨烯表面上的二氧化硅沉淀的协同作用原位制备生物矿化膜。实验很好地将仿生学与聚合物共混改性相结合,该实验具有操作简便易行,现象显著,容易引发同学兴趣等优点。

摘要：长久以来,高效电极催化材料的设计和开发一直是研究热点。由金属中心离子,特别是过渡金属(Fe,Co,Ni等)和多功能有机配体构建的金属有机框架化合物(MOFs),被认为是设计和制备各类催化电极材料的天然模板。本论文综述了近年来一些典型的MOFs及其衍生物在电催化水分解析氢反应(HER)、析氧反应(OER)以及氧还原反应(ORR)等领域中的研究现状;分析了基于MOFs的电催化材料在结构设计和制备方法上的相关策略;浅谈了该材料在相关电催化机理研究等方面所存在的问题。

摘要：A transient three-dimensional（3 D） model was established to understand the bubble motion in an industrial electrolytic process. An anode with a new design was tested. It incorporates two slots that allow an efficient removal of gas bubbles. The electromagnetic fields were described by solving Maxwell＇s equations. The bubble movement was studied with two-way coupling Euler-Lagrange approach. The interplay of current density and bubble nucleation rate was included. The collision and coalescence of bubbles were considered. Random walk module was invoked for involving the chaotic effect of the turbulence. The numerical results were validated by experimental measurements. The results indicate that the current distribution and the bubble nucleation periodically change. Due to the slot, the bubble elimination heavily increases. The contribution of the slot to the bubble removal exceeds 50% in the case of three currents, and the promotion of the slot decays with increasing the current.

摘要：受到航海运输领域的新政策和严格的排放法规限制,船舶应用燃料电池受到越来越多的关注与重视,尤其是具有高效率、低噪声、模块化的质子交换膜燃料电池(PEMFC)系统。本文介绍了由新源动力股份有限公司开发的船用PEMFC系统,以隔离防护和泄露探测为基准要求,该PEMFC系统配置了多个安全参数检测装置,对于BOP部件选型采用了针对性的方案,通过水热管理优化及标定,系统额定效率和峰值效率分别为45%和62%。为了证明PEMFC系统满足功能完善及安全可靠的要求,采用设计试验的方法研究并制定了性能评价试验,分别是可靠性试验、低温启动试验及双机并联试验。试验结果表明:经历了200h动态工况测试后系统在中间功率下性能无变化,在额定功率下电堆性能衰减率为1.2%;基于良好的水热管理及多模式控制手段,实现了吹扫时间和单体电压偏差大幅降低,当环境温度为-30℃时顺利实现低温启动,高于船用规范中的最苛刻要求;在高功率需求及冗余设计目标下,双机并联使得系统总成动力输出更平稳、可靠,而且通过交替启动策略提高了系统耐久性,不同的工作模式为系统维护及故障处理提供了基础条件;PEMFC系统具备搭载实船应用的能力。本文为船用PEMFC系统的设计和开发提供了参考依据。

摘要：滩头年画,作为湖南省独有的手工木刻版画,承载着丰富的民间文化习俗。本文通过深入挖掘其图案、造型、色彩等元素,结合现代审美与市场需求,设计出“画语滩头”文创产品系列,为传统民间艺术的传承与发展开辟新的路径。

摘要：The electronic structures and mechanical properties of Al4Sr, Mg2Sr and Mg23Sr6 phases were determined by the use of first-principles calculations. The calculated heat of formation and cohesive energy indicate that Al4Sr has the strongest alloying ability as well as the highest structural stability. The elastic parameters were calculated, and then the bulk modulus, shear modulus, elastic modulus and Poisson ratio were derived. The ductility and plasticity were discussed. The results show that Al4Sr and Mg2Sr phases both are ductile, on the contrary, Mg23Sr6 is brittle, and among the three phases, Mg2Sr is a phase with the best plasticity.

摘要：为了进一步提高汽车乘员舱空调系统的智能化和舒适性水平,本文提出了一种基于热舒适理论的个性化智能空调决策系统设计方案。首先,针对汽车乘员舱改进了基于PMV(predicted mean vote)和PPD(predicted percentage of dissatisfaction)理论的热舒适性计算方法;进一步,利用人体画像技术实现了乘员舱驾乘人员的热舒适性特征提取,并在专家经验知识的基础上构建了具有理论计算依据的乘员舱热舒适数据集;然后,利用机器学习算法搭建了个性化热舒适空调系统随机森林决策模型,以此满足个性化热舒适智能决策需求;最后,给出了完整的系统框架和设计。测试结果显示所提出的系统模型决策准确率在90%以上,实车测试结果表明:本文系统能够识别驾乘人员特征,实时进行个性化热舒适性参数推荐,验证了本研究决策方法的有效性和实用价值。

摘要：以北京艺术中心为对象,从设计理念、总平面设计、平面设计、立面设计、室内设计、室外设计等方面进行阐述,分享项目建筑设计相关内容。以期为同类型项目提供借鉴与交流,对其他公共文化建筑也有普遍借鉴意义,同时传递关注公共建筑设计的价值取向。

摘要：面向中国长寿命公路建设工程的需求,介绍了中国、美国和欧洲各国长寿命沥青路面的基本概念和发展历程,总结了中国和欧美国家长寿命沥青路面设计理论与方法的研究和发展现状,梳理了欧美国家既有沥青路面检测与评价、延寿处治设计方法,论述了中国典型既有沥青路面延寿设计方法的研究与发展现状,对比分析了不同新建道路长寿命设计方法和既有沥青路面延寿设计方法的优缺点和适用性。研究结果表明:目前尚未形成统一的长寿命沥青路面设计标准,研究与应用仍处于发展完善阶段,长寿命沥青路面依旧是未来路面领域的研究热点;耦合交通与环境因素,建立多指标控制的长寿命沥青路面设计体系是今后应重点研究的方向;长寿命沥青路面结构设计在今后将向非线性、多维度、概率型和动态化转变;基于结构层寿命逐层递增的长寿命沥青路面延寿设计方法可使沥青路面结构使用年限翻一番,相关工作可为既有沥青路面延寿设计方法和体系的构建及应用提供有价值的参考和见解,以满足中国长寿命公路建设工程发展需求;既有沥青路面延寿设计是道路工程可持续发展的重要课题,未来应加强长寿命沥青路面技术的研究和推广,提高路面的综合质量,满足不断增长的道路运输需求,为建设优质、高效、绿色、安全的交通基础设施做出更大贡献。