摘要：High entropy alloy has attracted increasing ***,to enhance the alloy strength often leads to impairment of the ductility,or vice *** we reported a heat treatment approach on AlCrFeNi2Ti0.5 high entropy alloy,which can elevate the strength and ductility *** ingot of AlCrFeNi2Ti0.5 weighing 2.5 kg was firstly fabricated by medium frequency induction *** samples from the same height of the bulk ingot were annealed for 6 h at 600,700,800 and 1000 ℃,*** 1000 ℃ annealing,an optimal microstructure was obtained by using our approach which can make some precipitation particles distribute homogeneously in the dendrite interior while keep the interdendrite structure as a single solid solution *** mechanical test on this AlCrFeNi2Ti0.5 alloy sample showed that,the compressive fracture strength σbc was increased by about600 MPa and the plastic strain ep was doubled,compared with those of the as-cast *** approach can be readily adapted to large-scale industrial production of high entropy alloys with high strength and ductility by proper annealing treatment.

摘要：A bio-inspired marsupial robotic fish system composed of heterogeneous robotic fish is proposed in this paper. A miniature robotic fish, as the daughter robotic fish, can adapt to some narrow space, while the mother robotic fish, with a cabin to transport the daughter, possesses a powerful movement ability to improve the mobility and endurance of the team. The structures for mimicking bio-motion and the method for fishlike-motion are presented. A typical task of daughter-mother following is given to show the cooperation of the team. A motion model of free swimming is built based on the Lagrangian function, and the coupled dynamic and kinematic functions are calculated based on the relation between the generalized force and fluid force. Then, a neural network is trained through the data generated from this model to get a predictive yaw controller, which can control the orientation by a different offset of each link. The daughter robotic fish adopts a dynamic light source tracking approach to follow the mother, and a heterogeneous communication-based finite state machine is presented for task modeling. Experiments are carried out to verify the system.

摘要：Bacteria adhesion and biofilm formation have raised severe problems on public health, food industry and many other areas. A variety of reagents and surface coatings have been developed to kill bacteria and/or limit their interaction with surfaces. It has also attracted many efforts to integrate different bactericidal elements together and maximize antibacterial efficiency. Herein, we review mechanisms for both passive and active approaches to resist and kill bacteria respectively, and discuss integrated strategies based on these two approaches. We also offer perspective on future research direction.

摘要：在2002年10月15日至18日为期三天的国际平面设计教育论坛上,来自世界18个国家和地区的30余位平面设计家和平面设计教育家,在中央美术学院学术报告厅就我们共同关心的平面设计教育问题与150名与会者进行交流研讨,笔者仅就平面设计和平面设计教育相关的内容做一摘述.

摘要：提出了一种不确定环境下多机器人的动态编队控制方法.通过队形参数矩阵确立多机器人之间的相对位置关系,将全局队形控制问题转化为跟随机器人离轴点对虚机器人(与领航机器人运动方向一致,且对领航机器人保持期望的相对距离和观测方位角)离轴点的跟踪.基于建立的跟随机器人和领航机器人之间的误差跟踪系统模型设计相应控制律实现队形保持,并提出了防止机器人与障碍物及其它机器人碰撞的避障策略.仿真结果表明了所提方法的可行性和有效性.

摘要：为满足实时性、较强环境适应性以及可靠性的需求,提出了一种基于放射状标志符号的视觉识别方法.标志所采用的符号呈放射状且辐条近中心部分由四周向中心逐渐变细.利用符号的亮度特征、对称性特征、形态学特征、Haar以及拓扑等特征,构建了一系列分类器以对图像上各点进行层层筛选,最终获取符号中心点在图像中的坐标.进一步设计出竖直排列双符号的符号标志块以实现目标识别.最后通过实验进行了验证.

摘要：为提高电炉的作业效率，延长部件的使用寿命，对原水套和水冷部件的结构及损坏情况进行了分析，并设计出了新型水冷构件。实际应用表明，该水冷部件达到了预期的冷却效果。

摘要：研究了仿生机器鱼的自主避障控制，提出了一种集成超声和红外传感器的仿生机器鱼系统设计方案，为机器鱼安装了3个超声传感器和3个红外传感器。针对此仿生机器鱼系统，提出了一种基于增强式学习的仿生机器鱼自主避障控制策略，给出了状态集和行为集，采用当场奖励和延时奖励相结合的方法，通过学习获得了有效的状态行为组合。仿真实验验证了学习结果的有效性。

摘要：基于2017年全国流动人口动态监测数据定量比较分析了乡−城和城−城流动人口落户意愿的影响因素及差异。研究发现:①总体而言,城−城流动人口的落户意愿显著高于乡−城,户籍价值、社会融入对两类流动人口的落户意愿有显著影响,但影响程度在两类人群间存在差异。②流出地的户籍价值显著阻碍了乡−城流动人口的落户意愿;流入地的户籍价值、经济方面的整合融入对城−城流动人口落户意愿的影响更显著。③户籍价值、社会融入对流动人口落户意愿的影响存在城市规模及流动距离分异。④产生上述差异的根本原因是不同户籍身份所塑造的价值观念和行为模式等的差异。

摘要：日本国立公文书馆网上档案展览建设起步较早,经验较为丰富。其以用户为中心的建设理念、多样的展览主题、对馆藏资源的深入挖掘、展览页面设计注重细节、全方位进行宣传的特点具有较大参考价值,可从制度保障与过程控制两方面总结对我国网上档案展览建设的借鉴与启示。