摘要：Particles and fields represent two major modeling paradigms in pure and applied science at all. In this paper a methodology and some of the results for three-dimensional (3D) simulations that include both field and particle abstractions are presented. Electromagnetic field calculations used here are based on the discrete differential form representation of the finite elements method, while the Monte Carlo method makes foundation of the particle part of the simulations. The first example is the simulation of the feature profile evolution during SiO2 etching enhanced by Ar + /CF4 non-equilibrium plasma based on the sparse field method for solving level set equations. Second example is devoted to the design of a spiral inflector which is one of the key devices of the axial injection system of the VINCY Cyclotron.

摘要：This paper presents a new design of CADEL,a cable-driven elbow-assisting device,with light weighting and control *** new device design is appropriate to be more portable and user-oriented solution,presenting additional facilities with respect to the original *** of potential benefits of improved portability can be envisaged in the possibility of house and hospital usage keeping social distancing while allowing rehabilitation treatments even during a pandemic *** attention has been devoted to design main mechatronic components by developing specific kinematics *** design process includes an implementation of specific control hardware and *** kinematic model of the new design is formulated and features are evaluated through numerical simulations and experimental *** evaluation from original design highlights the proposed improvements mainly in terms of comfort,portability and user-oriented operation.

摘要：According to the combination of the complementary medium and transformation optics, the shape of two-dimensional (2D) internal-external cloaks has been generalized into any geometry to adapt to the variety of object shapes. In order to adapt to the practical application, some approximations have been introduced to eliminate the infinite singularity of the parameters in the compressed region by adjusting the principle sketch out of the plane. Firstly, the general parameter equations of the nonsingular cloak with arbitrary cross-section are deduced strictly by the mathematical method based on coordinate transformations in the cylindrical coordinate system. Secondly, taking into account the discontinuous property of the curve functions of arbitrary polygons, a supplementary investigation is given for the nonsingular cloak with arbitrary polygonal cross-section. The transformations in the supplementary study are carried out in the Cartesian coordinate system directly and referred to the coordinates of the polygon's vertices rather than the curve function of the polygon. Last, the invisibility effect of the corresponding cloak is studied by full-wave simulations based on the finite element method. The applicable scope of the 2D internal-external cloak is expanded greatly by the methods and results given in this paper.

摘要：This paper addresses the design of a novel bionic robotic device for upper limb rehabilitation tasks at *** main goal of the design process has been to obtain a rehabilitation device,which can be easily portable and can be managed remotely by a professional *** allows to treat people also in regions that are not easily reachable with a significant cost *** potential benefits can be envisaged,for instance,in the possibility to keep social distancing while allowing rehabilitation treatments even during a pandemic *** attention has been devoted to design the main mechatronic components by developing specific kinematics and dynamics *** design process includes the implementation of a specific control hardware and *** experimental tests are reported to show the effectiveness and feasibility of the proposed design solution.

摘要：Two types of Mg-Cu composition system graded density impactors used for complex loading （shock loading and quasi-isentropic compression） are designed by the elastic-plastic hydrodynamic method in this paper. Mixtures of metal powders in the Mg-Cu system are cast into a series of 17 and 25 uniform compositions ranging from 100% Mg to 100% Cu. The graded den- sity impactors are launched to the stationary 10 Ixm aluminum film and 12 mm LiF window targets by a two-stage light-gas gun in the National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, and the resulting wave profiles are measured with the DISAR system. Hydrodynamic simulation results are perfectly consistent with the experiments. Our work in this paper will set up a foundation for further research of controllable loading/releasing routes and rate experiments in the future.

摘要：具有强光学非线性和高稳定性的非线性光学(NLO)有机材料因其潜在的广泛应用而备受关注.本研究中,我们设计并系统地研究了具有超强二阶非线性光学响应的一种新型NLO查尔酮衍生物—1-(4-甲氧基苯基)-3-(4-乙氧基苯基)-2-丙烯基-1-酮(DMPO).合成得到的这种新设计的DMPO仅在5天内即可快速生长出尺寸为10×5×4 mm^(3)的DMPO单晶.这些DMPO晶体由中性有机分子组成,它们在较宽的波段600–1800 nm范围具有高透明性,还拥有适度的光学带隙(2.51 eV),并展现出卓越的抗潮解性能.重要的是,DMPO实测的二次谐波产生(SHG)响应高达基准材料4-(4-二甲氨基苯乙烯基)甲基吡啶对甲苯磺酸盐(DAST)的1.86倍,证实了DMPO具有优良的宏观二阶光学非线性性质.因此,DMPO是集多种优点于一身的一种有机NLO新材料,可广泛应用于NLO领域.

摘要：Hydro generators installed in Itaipu Binacional power plant with 824/737 MVA rated output power （50/60 Hz） belong to the largest ones in the world. Among many unique features, the generators are equipped with the largest hydrodynamic thrust bearings ever built （external diameter 5,200 mm, axial load equals approximately 3,600 t）. This paper is an attempt to propose a new thrust bearing design with the use of the state-of-the-art technologies and simulation techniques that demonstrate a reduction of friction power losses generated by the thrust bearing. This paper is divided into two parts. Within the first one, the original thrust bearing design which was implemented in the generators is described. Related calculation results based on a TEHD （thermo-elasto-hydrodynamic） calculation software used by Alstom will be presented. A comparison between measurement results gathered in the 1980s is given. In the second part, a potential solution of a more beneficial bearing design is described. The proposed thrust bearing design modification is an implementation of Alstom＇s PolypadTM coating. This modern polymer （PEEK） coating material has already been used by Alstom in projects around the world for many years. This coating allows pushing the operating parameters limits toward higher temperatures and lower oil film thicknesses far beyond the limits known for the conventional bearing materials.