摘要：The laser-induced porous graphene(LIG)prepared in a straightforward fabrication method is presented,and its applications in stretchable strain sensors to detect the applied strain are also *** LIGformed on the polyimide/polydimethylsiloxane(PI/PDMS)composite exhibits a naturally high stretchabil-ity(over 30%),bypassing the transfer printing process compared to the one prepared by laser scribing onPI *** PI/PDMS composite with LIG shows tunable mechanical and electronic performances withdifferent PI particle concentrations in *** good cyclic stability and almost linear response of theprepared LIG’s resistance with respect to tensile strain provide its access to wearable *** im-prove the PDMS/PI composite stretchability,we designed and optimized a kirigami-inspired strain sensorwith LIG on the top surface,dramatically increasing the maximum strain value that in linear response toapplied strain from 3%to 79%.

摘要：Energy consumption and acoustic noise can be significantly reduced through perching in the sustained flights of small Unmanned Aerial Vehicles(UAVs).However,the existing flying perching robots lack good adaptability or loading capacity in unstructured *** at solving these problems,a deformable UAV perching mechanism with strong adaptability and high loading capacity,which is inspired by the structure and movements of birds'feet,is presented in this *** elastic toes,an inverted crank slider mechanism used to realize the opening and closing movements,and a gear mechanism used to deform between two configurations are included in this *** experiments on its performance towards different objects,Results show that it can perch on various objects reliably,and its payload is more than 15 times its *** integrating it with a quadcopter,it can perch on different types of targets in outdoor environments,such as tree branches,cables,eaves,and spherical *** addition,the energy consumption of the UAV perching system when perching on objects can be reduced to 0.015 times that of hovering.

摘要：In this study,we designed an oil-filled motor that can be used at full-ocean depths,and investigated the friction losses caused by the rotating seal and the properties of the *** direct current(DC)motor is encapsulated in an aluminum alloy housing.A rubber diaphragm is used to balance the internal and external pressures so that the motor can work on the seabed without pressure *** study the resistance caused by the rotating seal,a numerical model of the Glyd ring and the rotating shaft was *** from a rotational torque test agreed with those from numerical *** kinematic viscosity of four oils was measured at 1-25℃.Oil bath experiments in an incubator showed that the resistance from oil is highly correlated with its dynamic *** appears to be very suitable as an insulating oil for these *** working characteristics of the motor were tested in a high-pressure *** results showed that the motor needs to overcome higher oil resistance under higher pressure.A prototype of a pressure-adaptive motor was designed and applied successfully in the hadal zone at a water depth of more than 10000 m.

摘要：A new multi-functional bridge seismic isolation bearing(MFBSIB) is designed and its mechanical model is developed in this *** an upper sliding device and a lower energy dispassion isolation device effectively,the new MFBSIB can adjust the deformation caused by temperature,vehicle breaks,and concrete creep,etc.,in addition to dissipating *** switch of 'slide-isolation' is achieved and the efficiency of both upper and lower parts is validated through experiment with a *** shear performance curve established in this paper is verified to be efficient in describing the mechanical characteristics of the bearing through *** is proved through both numerical calculation and experimental analysis that the new MFBSIB is endowed with enough vertical rigidity,good energy dissipation ability,stable overall performance,and good realization in expected *** performance is slightly influenced by shear stress,while affected by vertical pressure,loading frequency,slide limit,etc.,*** results could provide reference for study and application of the new MFBSIB.

摘要：Robotic subsea stratum drilling robot is a method for new subsea stratigraphic geological investigation and resource *** at the front end is the main source of resistance to the robot’s motion in the *** there is no continuous and strong downward drilling force as in conventional drilling rigs,robot movement relies heavily on the drill bit to reduce the drilling *** this study we propose a self-propelling drill bit that can discharge soil debris to provide propulsive force and reduce the *** key parameter of the drill bit design,the spiral blade lead angle,was determined by theoretical analysis of the drill bit’s soil discharging *** verify the structural advantages of the self-propelling drill bit in reducing resistance,a comparative analysis with a conventional conical drill bit was *** drilling process of both bits was simulated using finite element simulation at various rotation speeds,the penetration force and torque data of both drill bits were obtained,and tests prepared accordingly in subsea soil were *** simulations and tests verified that the penetration force of the self-propelling drill bit was lower than that of the conventional conical drill *** self-propelling drill bit can reduce the resistance effectively,and may play an important role in the stratum movement of drilling robots.

摘要：This paper presents the basic principle of OFDM technology and some key technologies, and do the simulation of OFDM technology. Secondly, on the basis of the design of intelligent Home Furnishing system demand, this paper research and design low voltage power line carrier communication based on Intelligent Home Furnishing system for. The circuit takes ARM Cortex-M3 based on the ARM kernel as the central controller, and realize remote monitoring and control of equipment through the transplantation of uC/OS-II system and the design of Web Serve program. Using OFDM power line carrier communication modes as networking mode of the intelligent Home Furnishing system. Finally, the paper realize the intelligent node and relevant software that constitute a complete system of intelligent Home Furnishing.

摘要：Metal‐organic frameworks(MOFs)are a series of highly porous crystalline materials,which are built from inorganic metal nodes and organic linkers through coordination *** unique porous structural features(such as high porosity,high surface areas,and highly ordered nanoporous structures)and designable structures and compositions have facilitated their use in gas capture,separation,catalysis,and energy storage and ***,the design and synthesis of pure MOFs and their derivatives have opened new routes to develop highly efficient electrocatalysts toward oxygen reduction reactions(ORR)and oxygen evolution reactions(OER),which are the core electrode reactions in many energy storage and conversion techniques,such as metal‐air batteries and fuel *** review first discusses recent progress in the synthesis and the electrocatalytic applications of pure MOF‐based electrocatalysts toward ORR or OER,including pure MOFs,MOFs decorated with active species,and MOFs incorporated with conductive *** following section focuses on the advancements of the design and preparation of various MOF‐derived materials-such as inorganic nano‐(or micro‐)structures/porous carbon composites,pure porous carbons,pure inorganic nano‐(or micro‐)structured materials,and single‐atom electrocatalysts-and their applications in oxygen ***,we present a conclusion and an outlook for some general design strategies and future research directions of MOF‐based oxygen electrocatalysts.

摘要：研究目的:为超大跨度斜拉桥抗风设计与抖振控制提供参考。研究方法:基于ANSYS建立了苏通大桥三维有限元模型,并在MATLAB平台模拟了苏通大桥三维脉动风场。考虑主梁断面气动自激力,进行了苏通大桥抖振时域分析。根据苏通大桥动力特性和抖振时域分析结果,重点分析了多重调谐质量阻尼器(MTMD)用于抖振控制的参数敏感性。考虑MTMD的控制效果、建造费用、施工难度及鲁棒性等因素建立了关于MTMD设计参数的目标函数,并基于一阶优化算法进行目标函数最优解的非线性搜索,据此获得了MTMD在约束条件下的最优设计参数。重要结论:1.苏通大桥侧向抖振位移主要由第一阶侧弯振型控制,竖向抖振位移主要由第一阶竖弯振型控制;***的控制效果对设计参数的变化十分敏感,其中质量比和频带宽敏感性更强;***的最优设计参数可以通过一阶优化算法获得,并可通过零阶优化算法对优化结果进行验证;4.采用优化后的MTMD设计参数,苏通大桥的抖振响应可以得到明显抑制,且侧向抖振控制效果更加明显。

摘要：好友匹配通过比较用户间属性相似度向交友请求者推荐好友,是移动社交网络应用中的核心功能。然而,在好友匹配的过程中,用户个人信息很可能会被服务器或者其他恶意用户窃取导致隐私泄露,且现有方案存在匹配结果不精确或者无法满足用户多维度隐私保护需求等挑战。基于此,提出面向隐私保护的精确好友匹配(P3M)方案,查询者可以根据自身需求灵活设定特征属性和距离的匹配范围。利用可比较内积编码(CIPE)和Paillier加密算法对用户属性和查询范围进行编码和加密,并设计安全点积协议实现用户属性和查询范围的安全比较。相较于现有方案,P3M方案支持查询者自定义查询范围以获得精确的查询结果,综合考虑用户特征属性及位置属性等多维度的隐私保护。最后,对P3M的正确性和安全性进行详细分析和证明,并通过实验验证P3M方案的有效性和高效性。

摘要：“以戏入稗”在明清通俗小说中是非常普遍的现象,进而成为一种自觉的创作方式,这一点在《红楼梦》中体现得尤其突出。《红楼梦》中的“以戏入稗”贯串小说整体,形式丰富多样,它既是作者赋能人物形象塑造的有效手段,又是衍生情节耦合结构的高超技巧,同时还是烘托、暗示双重主题思想的形象媒介。合而观之,《红楼梦》里的“入稗之戏”均非泛泛之笔,而是寄寓了作者明确的叙事意图,取得了显著的艺术效果,在继承前人“以戏入稗”经验的基础上有所推进和创新。