摘要：The global demand for effective skin injury treatments has prompted the exploration of tissue engineering *** three-dimensional(3D)bioprinting has shown promise,challenges persist with respect to achieving timely and compatible solutions to treat diverse skin *** situ bioprinting has emerged as a key new technology,since it reduces risks during the implantation of printed scaffolds and demonstrates superior therapeutic ***,maintaining printing fidelity during in situ bioprinting remains a critical challenge,particularly with respect to model layering and path *** study proposes a novel optimization-based conformal path planning strategy for in situ bioprinting-based repair of complex skin *** strategy employs constrained optimization to identify optimal waypoints on a point cloud-approximated curved surface,thereby ensuring a high degree of similarity between predesigned planar and surface-mapped 3D ***,this method is applicable for skin wound treatments,since it generates 3D-equidistant zigzag curves along surface tangents and enables multi-layer conformal path planning to facilitate the treatment of volumetric ***,the proposed algorithm was found to be a feasible and effective treatment in a murine back injury model as well as in other complex models,thereby showcasing its potential to guide in situ bioprinting,enhance bioprinting fidelity,and facilitate improvement of clinical outcomes.

摘要：It has made significant progress in catalyst andreactor design for commercial current densities in CO_(2) electroreduction(CO_(2)ER).However,these catalyst systems haverarely been applied for a C2 gas product of ethane due to itscommonly inferior selectivity relative to other C1 and ***,bamboo-like amorphous Ni(OH)_(2) nanotubes wrapped Cu nanoparticles composite(Cu NPs@aNi(OH)_(2)NTs)are constructed for selective CO_(2)ER to ethane ina flow *** unique structure of Cu NPs@a-Ni(OH)_(2) NTsprovides a confined geometry to improve the adsorption of thereactive *** interface of Cu NPs and a-Ni(OH)_(2) NTs isstabilized by generating some NiOH *** producedCu@NiOH interface enhances the activation of CO_(2) to*C*OOH and strengthens the adsorption of*COL on Cu sitefor more*COH formation and its dimerization for finalethane ***,amorphous Ni(OH)_(2) nanotubes promote water dissociation for the hydrogenation ofcarbonous intermediates,contributing to ethane *** synthesized Cu NPs@a-Ni(OH)_(2) NTs can reach a Faradaicefficiency of 48.3%and a partial current density of−226.7 mA cm^(−2) for ethane at−0.7 V in a flow cell,with aremarkable stability for 24 *** work provides a rationalstrategy to engineer Cu-based composite for selective CO_(2)ERto ethane in a flow cell.

摘要：In this paper, we give some convergence results on the gradient projection method with exact stepsize rule for solving the minimization problem with convex constraints. Especially, we show that if the objective function is convex and its gradient is Lipschitz continuous, then the whole sequence of iterations produced by this method with bounded exact stepsizes converges to a solution of the concerned problem.

摘要：Dipoles with Lorentz-type resonant electromagnetic responses can realise negative effective parameters in their negative resonant region. The electric dipole and magnetic dipole can realise, respectively, negative permittivity and negative permeability, so both the field distribution forms of electric and magnetic dipoles are fundamentals in designing left-handed metamaterial. Based on this principle, this paper studies the field distribution in high-permittivity dielectric materials. The field distributions at different resonant modes are analysed based on the dielectric resonator theory. The origination and influence factors of the electric and magnetic dipoles are confirmed. Numerical simulations indicate that by combining dielectric cubes with different sizes, the electric resonance frequency and magnetic resonance frequency can be superposed. Finally, experiments are carried out to verify the feasibility of all-dielectric left-handed metamaterial composed by this means.

摘要：Nowadays, with improvements in the quality of life, people are paying more attention to their health. Traditional Chinese medicine offers great advantages for daily care. In this paper, we present the development of a remote health care system, namely, Chinese Pulse Condition Acquisition System （CPCAS）, based on the principle of Chinese pulse diagnosis in Chinese medicine and a wireless sensor network. We designed a remote health care terminal with a mini-pulse collection bench to overcome the challenge of differences in pulse characters of different people. An effective measured pressure control algorithm is proposed to achieve a balance between control accuracy and control time. The special signal conditioning circuit showed good performance in analog pulse signal processing. We also performed significant research to address the challenges of symptom recognition. Other distinctive features of this system include the following： intelligent sensing, a wireless health care network, effective energy management, small size, lightweight, and the ability to be networked for remote management. In this paper, we have introduced the design and implementation of CPCAS. We also demonstrate the use of the system and give evaluations on this system by several experiments. Our results indicate that CPCAS has significant practical feasibility.

摘要：Optimum design of rider-bicycle mechanisms is very important for customizing bicycles and plays a crucial role in the improvement of athletes' performances and in protection of the *** the birth of the first bicycle,people have been keeping optimizing bicycles with respect to physical conditions of *** modern design,the basic structure of a bicycle has been formulized,while many geographic parameters remain *** this paper,the bicycle and the human body are considered as a kinematic mechanism,called rider-bicycle *** optimum design is implemented from the perspective of ***-saving and comfortableness are considered at the same *** corresponding performance charts are drawn and the relationship between the performances and parameters of seat height,crank length and body parameters are *** using these charts,the optimal design method of bicycle's parameters for a specified person is then *** solutions to get suitable seat height and crank length for a person are obtained *** research is of significance for customizing bicycles and design of bicycle robot.

摘要：Network-on-Chip （NoC） with excellent scalability and high bandwidth has been considered to be the most promising communication architecture for complex integration systems. However, NoC reliability is getting continuously challenging for the shrinking semiconductor feature size and increasing integration density. Moreover, a single node failure in NoC might destroy the network connectivity and corrupt the entire system. Introducing redundancies is an efficient method to construct a resilient communication path. However, prior work based on redundancies, either results in limited reliability with coarse grain protection or involves even larger hardware overhead with fine grain. In this paper, we notice that data path such as links, buffers and crossbars in NoC can be divided into multiple identical parallel slices, which can be utilized as inherent redundancy to enhance reliability. As long as there is one fault-free slice left available, the proposed salvaging scheme named as RevivePath, can be employed to make the overall data path still functional. Furthermore, RevivePath uses the direct redundancy to protect the control path such as switch arbiter, routing computation, to provide a full fault-tolerant scheme to the whole router. Experimental results show that it achieves quite high reliability with graceful performance degradation even under high fault rate.

摘要：We propose an efficient and robust way to design absorbing boundary conditions in atomistic computations. An optimal discrete boundary condition is obtained by minimizing a functional of a reflection coefficient integral over a range of wave numbers. The minimization is performed with respect to a set of wave numbers, at which transparent absorption is reached. Compared with the optimization with respect to the boundary condition coefficients suggested by E and Huang [Phys. Rev. Lett. 87 （2001） 133501], we reduce considerably the number of independent variables and the computing cost. We further demonstrate with numerical examples that both the optimization and the wave absorption are more robust in the proposed design.

摘要：Powered lower limb exoskeletons have traditionally used four or more powered joints to provide ambulation assistance for individuals with spinal cord *** with numerous powered joints commonly lost some excellent features of passive orthoses and further decreased utility due to added weight and increased control *** work adopts joints coupling mechanism to design a powered exoskeleton to minimize the number of actuated joints and control *** conventional powered exoskeletons,the joint-coupled-powered exoskeleton only has a single motor-actuated joint for each exoskeleton leg in conjunction with a unique knee coupled system to enable their users to walk,sit,and *** two types of joint coupled systems are designed,respectively,hip-knee coupled and knee-ankle *** joint-coupled-powered exoskeleton system allows a single actuator to power the hip motion,and allows activate knee motion through the coupled motions of the hip or *** specifically,when the mechanical coupled system is activated,the knee joint is unlocked,resulting in synchronized hip-knee or ankle-knee flexion and *** coupling mechanism is switched on and off at specific phases of the gait(the stance phase and the swing phase)to generate the desired *** research work proves that minimal actuated robotic systems with joint coupled could achieve safe and natural walking.

摘要：In this study, the effects of length-width ratio and diversion trench of the spacer on the fluid flow behavior in an electrodialyzer have been investigated through CFD simulation method. The relevant information, including the pressure drop, velocity vector distribution and shear stress distribution, demonstrates the importance of optimized design of the spacer in an electrodialysis process. The results show width of the diversion trench has a great effect on the fluid flow compared with length. Increase of the diversion trench width could strength the fluid flow, but also increase the pressure drop. Secondly, the dead zone of the fluid flow decreases with increase of length-width ratio of the spacer, but the pressure drop increases with the increase of length-width ratio of the spacer. So the appropriate length-width ratio of the space should be moderate.