Multifunctional,Ultra-Tough Organohydrogel E-Skin Reinforced by Hierarchical Goatskin Fibers Skeleton for Energy Harvesting and Self-Powered Monitoring

E-skins based on conductive hydrogels are regarded as ideal candidates for sensing application. However, limited by the constructed materials and strategies, the current conductive hydrogels have poor mechanical properties, single function, and unsatisfactory conductivity, which seriously hinder their development and application. Herein, the natural goatskin with hierarchical 3D network structure weaved by collagen fibers is used as the substrate material for the construction of ultra-tough hydrogel through a “top-down” strategy, in which acrylic acid monomer is first vacuum-impregnated into the interstices of goatskin fibers skeleton and is then polymerized in situ to produce the skin-based hydrogel with unique 3D wrapping structure. Based on the skin-based hydrogel, a substrate with load-carrying capacity, after loaded with a new multifunctional nanoscale-conductive medium nanosilver particles (AgNPs) and 1,3-propanediol, a goatskin-derived multifunctional organohydrogel S@HCP is constructed with excellent mechanical properties, self-adhesion, transparency, ultraviolet shielding, antibacterial, biocompatibility, environmental stability, and conductivity. Notably, the stretchable S-TENG assembled using S@HCP can be perfectly suited for real-life applications including biomechanical energy harvesting, self-powered tactile-sensing, and motion monitoring. It is believed that, by combining natural animal skin with different functional materials, it is possible to reuse animal skin, “dead skin,” which provides a new platform for developing multifunctional flexible e-skin.     

柔性空间机械臂末端运动及柔性振动的模糊自适应补偿控制

讨论了载体位置不受控、姿态受控情况下,具有不确定参数的漂浮基柔性空间机械臂系统载体姿态与末端爪手惯性空间轨迹跟踪的模糊自适应补偿控制和柔性振动优化控制问题.利用拉格朗日方程和假设模态法并结合系统动量守恒关系,分析、建立了柔性空间机械臂系统的动力学方程及运动Jacobi关系.以此为基础,使用奇异摄动法和2种时间尺度的假设...     

磁悬浮轴承弹性转子非线性系统的建模与控制

在考虑陀螺效应、转轴弹性与非线性电磁力的条件下,建立了磁悬浮轴承弹性转子系统动力学非线性控制模型;并采用精确非线性反馈方法,实现了对磁悬浮轴承弹性转子系统的有效控制.针对磁悬浮非线性模型与线性化后的模型、刚性磁悬浮与弹性磁悬浮模型所需控制参数进行了比较;仿真结果表明,考虑轴承弹性的非线性磁悬浮模型所需控制量与线性化模型...     

柔性线型聚能切割器的应用研究

从聚能射流形成及侵彻理论出发,总结了影响聚能射流穿深的因素,根据这些因素的分析及工程实际条件,设计并制造了一种铅质外壳柔性线型聚能切割器,对10 mm厚的45′钢板和斜支撑上截取的钢板进行聚能切割实验,发现线密度为158 9·m-1,炸高为2.4 mm的柔性线型聚能切割器完全贯穿45#钢板和斜支撑上截取的钢板;把此种柔...     

钢芯自动双发装压药技术

介绍大口径机枪弹钢芯双发全自动分步装压药生产线的组成和工作原理,对由于半成品一致性和药剂流散性造成的误差进行分析,并采用特制计量板装药技术进行装药,采用双发浮动压药技术进行压药,压药压力采用全数字双闭环反馈进行控制。长期使用结果表明,该技术能提高产品的质量和各项技术指标,实现安全可靠高效的全自动化生产,可广泛应用于国内多个弹种装压药生产。     

钛合金表面激光重熔镍包石墨涂层的研究

为了提高钛合金的表面耐磨性能,以镍包石墨粉末作为预涂材料,先热喷涂到Ti-6A l-4V基底表面,再采用激光技术进行重熔处理,获得了质量良好的增强涂层。通过XRD、SEM和EDS对涂层组织进行分析,结果表明:涂层的微观组织为固熔了少量Ti元素的镍基,含有大量的TiC增强相。这些TiC增强相呈现发达的枝晶状形态,是在激光重熔过程中原位反应生成的。显微维氏硬度测试表明:激光重熔涂层的硬度达到HV1200,是钛合金基底硬度的3倍。     

Very Large Photoconduction Enhancement Upon Self‐Assembly of a New Triindole Derivative in Solution‐Processed Films

A new carbazole‐related small molecule exhibiting self‐assembly into ordered nanostructures in solution‐processed cast films has been synthesized and its charge‐photogeneration and ‐transport properties have been investigated. Large photoconductivity was measured in the amorphous state while an enormous improvement in the photoconduction properties was observed when the molecules spontaneously organized. Photocurrents increased upon self‐assembly by up to four orders of magnitude, mostly due to the drastic enhancement of the charge photogeneration. A greatly favorable arrangement of the aromatic cores in the resulting nanostructures, which were characterized by X‐ray analysis, may explain these improvements. Photocurrents of mA cm^?2, on/off ratios of 10⁴ and quantum efficiencies of unity at low field and light intensity, which are among the best values reported to date, along with the simplicity of fabrication, give this readily‐available organic system great potential for use in plastic optoelectronic devices.     

PCB生产计划之实施与管理

简述PCB生产计划实施与管理的重要性,并分别从统筹、系统、精细、灵活四个方面展开讲解,以满足客户要求。     

汽车车身焊接的智能化与自动化

主要对焊接机器人的使用实现了车身焊接的智能化与自动化进行研究。首先科学地阐述了弧焊机器人、点焊机器人和激光焊机器人的结构与工作原理以及三种机器人在焊接工作中的特点。接着通过机器人在车身焊接生产线中的应用,集中对实现生产线的柔性化程度和自动化程度;提高装焊专业化、智能化和自动化水平;满足新装焊工艺和技术的要求以及提高生产的智能化和科技的创新化水平进行了科学的分析。     

值得思索的中国FPC生产状态

中国的FPC应走向以刚-挠性PCB为主的新产品上。