【摘 要】
：
Transfer printing based on switchable adhesive is essential for developing unconventional systems,in-cluding flexible electronics,stretchable electronics,and micro light-emitting diode (LED) displays.Here we report a design of switchable dry adhesive base
【机 构】
：
Department of Engineering Mechanics,Soft Matter Research Center,and Key Laboratory of Soft Machines
论文部分内容阅读
Transfer printing based on switchable adhesive is essential for developing unconventional systems,in-cluding flexible electronics,stretchable electronics,and micro light-emitting diode (LED) displays.Here we report a design of switchable dry adhesive based on shape memory polymer (SMP) with hemispher-ical indenters,which offers a continuously tunable and reversible adhesion through the combination of the preloading effect and the thermal actuation of SMP.Experimental and numerical studies reveal the fundamental aspects of design,fabrication,and operation of the switchable dry adhesive.Demonstrations of this adhesive concept in transfer printing of flat objects (e.g.,silicon wafers),three-dimensional (3D)objects (e.g.,stainless steel balls),and rough objects (e.g.,frosted glasses) in two-dimensional (2D) or 3D layouts illustrate its unusual manipulation capabilities in heterogeneous material integration applications.
其他文献
This paper experimentally studied the features of air-water flow during the emptying of a water-filled prismatic tank with a bottom orifice under different conditions.The experiments were conducted with both circular and elliptical orifices,with and witho
针对柳塔矿22103运输巷沿空留巷围岩变形特征不清的问题,综合采用数值模拟、理论分析与现场实测的方法,对沿工作面不同超前距离条件下的沿空留巷顶底板移近量进行了详细研究.研究表明,沿空留巷顶底板移近量随着工作面超前距离的不断增加呈现先增加后趋于稳定的趋势;沿空留巷巷旁支护墙体一侧的顶底板移近量明显大于煤壁一侧的顶底板移近量,即顶板呈倾斜状态;本区段工作面回采过程中,沿空留巷顶底板移近量随工作面的推进大致可以分为采动影响阶段与留巷稳定阶段;实测结果与数值模拟和理论分析结果具有良好的一致性,且现场实测的巷道顶底
随着煤矿开采深度的加大,侏罗纪煤层向石炭纪煤层倾斜,运输巷道和回风巷道也在逐渐的变长,保证回采设备的的安全稳装,切眼工作面的开口、贯通、二次开口扩帮的巷道支护设计显得尤为重要.对燕子山矿C3煤层8212工作面开切眼巷道支护设计进行研究,考虑在遇到断层、上覆采空区及过25 m的煤柱压力区时,出现钢带断裂的情况,对专用锚杆轴力动态监测,通过ABAQUS数值模拟软件对切眼工作面在第1次掘进贯通时无支护条件下和有支护条件下的围岩应力、应变分析,之后在进行切眼工作面在第2次扩帮时以相同的方法进行分析比较.通过现场实
针对回采工作面单体支柱超前支护存在支护强度不足、工人劳动强度大等问题,提出了采用超前锚索主动支护替代原有的单体支柱被动支护的技术方案,并针对协庄煤矿三心拱巷道建立了围岩变形预计模型,通过理论分析得到了巷道合理超前支承力为0.83 MN,而超前锚索支承力可达到1.52 MN,满足超前支护需要;确定了巷道超前支护技术参数为:顶板每排布置3根φ22.0 mm×8300 mm超前锚索,排距1000 mm;在协庄煤矿11101工作面回风巷进行了应用,并在工作面推进过程中检测了超前支护段的围岩松动圈、围岩变形及锚索受
Compared with the Hamiltonian mechanics and the Lagrangian mechanics,the Birkhoffian mechanics is more general.The Birkhoffian mechanics is discussed on the basis of the generalized fractional operators,which are proposed recently.Therefore,differential e
Metals have been mankind\'s most essential materials for thousands of years.In recent years,however,innovation-driven development of major national security strategy and core areas of the national econ-omy is highly impeded by a shortage of advanced hig
Recently proposed clustering-based methods provide an efficient way for homogenizing heterogeneous materials,yet without concerning the detailed distribution of the mechanical responses.With coarse fields of the clustering-based methods as an initial gues
推移质泥沙颗粒的跃移是河流泥沙运动的重要形式.为了研究推移质颗粒跃移运动参数的变化规律,在水槽试验中采用高速摄像技术,观测7种工况条件下,0.3～1.7 mm粒径的推移质颗粒的跃移运动形态,提取颗粒跃移运动的时空信息,分析了泥沙颗粒跃移距离和跃移高度的变化规律.结果 表明,相对跃移高度和相对跃移距离的概率密度分布函数均服从Γ分布,对比前人的试验结果发现,4组试验颗粒的相对跃移距离概率分布的峰值提前,而其他3组试验结果的峰值几乎同时出现.试验值与韩其为公式的计算值基本符合,验证了理论计算值的合理性和可靠性.
The present study provides a three-dimensional volume-of-fluid method based on the adaptive mesh refinement technique.The projection method on the adaptive mesh is introduced for solving the incom-pressible Navier-Stokes equations.The octree structure mes
The actuator disc method is an engineering approach to reduce computer resources in computational fluid dynamics (CFD) simulations of helicopter rotors or aeroplane propellers.Implementation of an ac-tuator disc based on rotor circulation distribution all