摘要：Two major challenges,high cost and short lifespan,have been hindering the commercialization process of lowtemperature fuel *** Wei's group has been focusing on decreasing cathode Pt loadings without losses of activity and durability,and their research advances in this area over the past three decades are briefly reviewed *** the Pt-based catalysts and the low Pt usage,they have firstly tried to clarify the degradation mechanism of Pt/C catalysts,and then demonstrated that the activity and stability could be improved by three strategies:regulating the nanostructures of the active sites,enhancing the effects of support materials,and optimizing structures of the three-phase *** Pt-free catalysts,especialiy carbon-based ones,several strategies that they proposed to enhance the activity of nitrogen-/heteroatom-doped carbon catalysts are firstly ***,an indepth understanding of the degradation mechanism for carbon-based catalysts is discussed,and followed by the corresponding stability enhancement ***,the carbon-based electrode at the micrometer-scale,faces the challenges such as low active-site density,thick catalytic layer,and the effect of hydrogen peroxide,which require rational structure design for the integral cathodic *** review finally gives a brief conclusion and outlook about the low cost and long lifespan of cathodic oxygen reduction catalysts.

摘要：为提高大口径火炮自动装填过程中回转弹仓工作的精确性和鲁棒性,在分析现有拟连续算法相关研究内容的基础上,设计一种全新的改进拟连续控制器对回转弹仓进行位置控制。通过与滑模扰动观测器相结合,新控制器增益不依赖于系统扰动的不确定性边界,且不需引入额外的控制器参数,降低了控制器的设计和调试难度。通过Lyapunov方程验证控制器本身及闭环系统的稳定性。仿真和试验结果表明:新设计的控制器相对于已有拟连续算法具有优越性,在受到不确定时变负载和不确定参数扰动的情况下,新设计的改进控制器在应用于回转弹仓时,在趋近段可以获得更快的收敛速度,减小到位超调量,并在滑动段有效减弱抖振。

摘要：数字化时代高职艺术设计专业课程教学改革发展,需要以深化课程教学实践创新为载体,进一步明确新时期教育发展新方向,充分结合数字化时代高职艺术设计专业课程教学改革需求与内在条件,分析当前教学改革发展面临的问题与困境,并运用加强高职与企业多元合作发展、强化教师教育培训与拓展数字化教学功能三项策略,优化艺术设计专业课程教学新体系,提升数字化时代高职艺术设计专业课程改革的总体水平。

摘要：Cholesteric liquid crystal(CLC)particles can adaptively respond to constant changes in external stimuli and thus are widely used in solvent-sensing,pattern fabrication,and *** studies discussed the color change at the center of the particles for various ***,few studies analyzed the color change of the brush structure of particles in response to various applications because of the complicated birefringence *** this paper,we present a novel integrated sensing system based on the synergetic color change from the center and the brush structure of CLC *** system provides abundant and additional sensing information relative to the traditional *** particles are prepared by mixing reactive mesogens,a reactive chiral dopant,a non-reactive LC molecule,and a photoinitiator by using a microfluidic device and subsequent *** CLC particles exhibit gorgeous color at the center and brush structure upon various solvent stimuli because of the Bragg reflection and the birefringence effect,which is explained by the possible color-changing mechanism introduced in this *** proof-of-concept applications,such color-changing polymer particles are demonstrated in multi-solvent-sensing detection and pattern *** study provides new insights into the development of stimuli-responsive advanced functional materials with tailorable nanostructures toward technological applications ranging from sensing to display.

摘要：在中国制陶历史的长河里,景德镇的陶瓷艺术是中国发展史乃至是世界发展史上的最为耀眼的明珠。景德镇陶瓷艺术的发展历程造就了其深厚的陶瓷文化底蕴,对于中华陶瓷文化的传承弘扬有着不可或缺的作用。如今陶瓷绘画在引领陶瓷艺术发展的新方向,陶瓷绘画是艺术与工艺的深度融合,正处于蓬勃发展的状态,因此推陈出新成为了当今艺术家的责任和使命,延续传统的精髓、融合时代的特征才能丰富陶瓷绘画的创作形式并且提升它的艺术高度和文化内涵。

摘要：青花瓷作为中华民族艺术史上的一颗璀璨明珠,承载着中国深厚的文化底蕴和艺术修养,它以独特的色调和典雅脱俗的气质在国际上享有盛誉。每一时代的青花瓷都有着显著的时代特征,呈现出不同的美学价值和文化价值。时至今日,青花瓷在传承与创新中不断发展,不仅形式多样、风格多变,而且所蕴含的艺术性与学术性也得到了突破性的提升。

摘要：针对一类由Roesser模型描述的饱和2-D系统,为了缓解网络数据传输压力,研究基于动态事件触发机制的输出反馈H_(∞)控制器设计问题.首先,构建此类不确定饱和2-D系统的数学模型;其次,提出一种动态事件触发机制决定当前信息能否传输到网络,以降低信号的更新频率;运用Lyapunov函数方法,通过引入非负标量μ,得到保证相应闭环系统满足一定H_(∞)性能指标的充分条件及输出反馈控制器的存在性判据;此外,利用锥补线性化算法,将输出反馈控制器的设计问题转化为线性矩阵不等式约束下的非线性最小化问题;最后,结合数值仿真验证基于动态事件触发机制的输出反馈控制方法的有效性和可行性.

摘要：在常规的空间结构设计中,通常把上部结构和基础分开独立计算,这种做法会导致空间结构边界条件假设与基础实际设计方案提供的支承刚度不符.另外,设计人员普遍采用包络设计方法以简化复杂荷载工况下的结构设计问题,对于短柱的基础而言,这种简化往往放大了对基础的承载力要求.在现有的设计水平下,基础优化的潜力未能得到充分发挥.本文提出一种基于空间结构与基础协同分析的优化方法,该方法通过将空间结构与基础的优化分析纳入每一次迭代计算中,减少不正确的边界条件假设给结构受力分析带来的误差;同时基础设计以上部结构各组合工况支座反力计算结果为依据,以避免因采用最不利荷载效应组合而带来不合理的承载力冗余.以三心圆张弦桁架为例的优化结果表明,该优化方法能显著降低基础材料用量,取得较为理想的经济效益.

摘要：针对踝关节康复训练的需求,分析踝关节的运动机理,运用模块化驱动单元与鲍登线,设计轻量化、易穿戴的柔性踝关节外骨骼机器人,实现踝关节跖屈/背屈、内/外翻的运动辅助.柔性外骨骼在背屈和跖屈阶段分别采用位置控制和力矩控制.位置控制以传统PID为主;力矩控制以力为反馈信号,建立交互力差值与鲍登线内芯位移补偿之间的导纳模型.通过Sigmoid变形函数实现导纳参数的动态调控,满足辅助力矩输出和人机交互柔顺性的需求.实验结果表明,位置跟踪误差不超过0.46 cm,力输出误差为-1.5~1.5 N,能够满足人体康复训练的需求.

摘要：舞台摄像是为观众呈现舞台剧目场景的重要手段,是展示歌剧、戏剧、音乐及舞蹈等艺术门类的重要媒介。大剧院的舞台摄像通过整合优秀艺术资源,能够将具有美学意义的舞台场景带到大众的视野。通过总结舞台摄像的特点,对其创作技巧进行汇总,分析舞台摄像的实际价值,为舞台摄像在舞台场景中的良好发展提供支持,有利于舞台演出展现其美学意义。