摘要：When a curling rock slides on an ice sheet with an initial rotation,a lateral movement occurs,which is known as the curling *** force of friction between the curling rock and the ice sheet changes continually with changes in the environment;thus,the sport of curling requires great skill and *** throwing of the curling rock is a great challenge in robot design and control,and existing curling robots usually adopt a combination scheme of a wheel chassis and gripper that differs significantly from human throwing movements.A hexapod curling robot that imitates human kicking,sliding,pushing,and curling rock rotating was designed and manufactured by our group,and completed a perfect show during the Beijing 2022 Winter Olympics *** switching between the walking and throwing tasks is realized by the robot’s morphology transformation based on leg configuration *** robot’s controlling parameters,which include the kicking velocity v_(k),pushing velocity v_(p),orientation angle θc,and rotation velocityω,are determined by aiming and sliding models according to the estimated equivalent friction coefficientμ_(equ)and ratio e of the front and back *** stable errors between the target and actual stopping points converge to 0.2 and 1.105 m in the simulations and experiments,respectively,and the error shown in the experiments is close to that of a well-trained wheelchair curling *** robot holds promise for helping ice-makers rectify ice sheet friction or assisting in athlete training.

摘要：The paper puts forward a kind of online shopping system based on ASP. NET technology, including the establishment of data- base anti the design of the front web pages. The system uses Microsoft ASP. NEF as development platform, C as the server language, and Microsoft Visual Studio 2008 as the development tool. ADO. NET is used to connect with SQL SERVER 2000 database through the data- base controls. A variety of server controls are used to create the ASP. NET page to implonent the syste^n functions. The syston is designed in 3-Layer application which includes Presentation Layer （PL）, Busi- ness Logic Layer （BLL） and Data Access Layer （DAL）. The operation of the database is in DAL, the logic fimction is in BLL. So the amotunt of work in the development, the difficulty of system maintenance and the upgrading can be reduced. After being tested, the system meets the requirement of the users.

摘要：Structure of a rotor and other design parameters are all viewed as constant using finite element software to analyze reliability of the rotor. In this case,reliability analysis of the rotor can't be realized for design parameters as random. Based on theory of elastic mechanics,starting with the micro element of the rotor,stress formulas on arbitrary point of turbine disc with equal and variable thickness are deducted under the influence of centrifugal force and temperature field on rotor system simultaneously. Considering the random of structural size of the turbine rotor,temperature stress,rotating speed,external loads and material strength,the reliability of a rotor is studied with stress-strength interference model,integral stochastic finite element method(ISFEM) and Gram-Charlier series method,and random structural reliability of the rotor is computed with higher accuracy.

摘要：具有出色电学响应和自供电能力的柔性可穿戴传感器已成为个人医疗保健和人机交互领域重要的研究方向.本文制备了一种基于摩擦纳米发电机的柔性自供电触觉传感器,由具有微四棱锥台结构的PDMS薄膜、铜电极以及P(VDF-TrFE)纳米纤维组成.在外部机械力刺激下,该传感器能通过接触-分离模式直接产生电学信号.MEMS工艺制备的均匀可控的微四棱锥台结构和静电纺丝制备的P(VDF-TrFE)纳米纤维,使得传感器展现出高灵敏度(2.97 V kPa^-1、高稳定性(超过40000次循环没有衰减)、快速响应(在1 Hz频率下60 ms)、低压力探测能力(重约35 mg,压强约为4 Pa的水滴)以及良好的线性度(在低压力区域为0.99231).PDMS薄膜的超柔韧性和优异的生物相容性,使得传感器能舒适地贴合在人体皮肤上.此外,所设计的传感器可以通过判断对应的电学响应信号识别各种人体运动类型.基于上述优势,该摩擦纳米发电机有望应用于姿态监测、健康评估以及人机交互等领域.

摘要：高效非贵金属催化剂对于推进析氢反应(HER)的大规模工业化至关重要.碳化钼(Mo_(2)C)因其类似铂的能带密度和优良的中间产物吸附特性,有望替代贵金属基材料成为具有前景的催化剂.然而,它在常规制备过程中存在严重的晶体过度生长和团聚问题,导致催化效率低.本研究利用三聚氰胺辅助法制备了含有丰富表面和界面的超细碳化钼/氮化钼(Mo_(2)C/Mo_(2)N)异质结构,并同时将其嵌入到氮掺杂碳纳米纤维(CNFs)中.Mo_(2)C/Mo_(2)N异质结构的协同作用与超细纳米晶表面暴露的丰富活性位点共同提高了电催化活性,而氮掺杂碳纳米纤维框架保证了快速的电荷转移和良好的结构稳定性.此外,原位形成的Mo_(2)C/Mo_(2)N晶体与碳基质之间存在较强的界面耦合作用,进一步提高了电子电导率和电催化活性.得益于这些优势,Mo_(2)C/Mo_(2)N@N-CNFs在碱性溶液中表现出优异的电催化析氢性能,在电流密度10 mV cm^(-2)时具有75 mV的低过电势,优于单相Mo_(2)C@N-CNFs对比样以及近期报道的Mo_(2)C/Mo_(2)N基催化剂.这个合成方法集成了异质结构、纳米化和碳修饰策略,为设计高效率电催化材料提供了新的参考.