摘要：A component-based model integration framework for computer numerical control system design and development is *** model integrates modeling,simulation,verification and implementation in a uniform *** computer numerical control(CNC) modeling language with well defined syntax and unambiguous semantics is *** the proposed CNC model integration method,a three axis milling system model is developed in the case *** approach is an attempt to create an infrastructure to support the CNC system design in an efficient way,while at the same time guarantees the function and performance requirements with advanced capability of the system such as modularity,flexibility,reusability,etc.

摘要：A mathematical model has been established for the research on scissor elevator for ship passenger *** kinematical and kinetic simulation analyses were carried out with MATLAB/*** relative kinetic relation between hydraulic cylinder and other parts,as well as its rules of change has been found.A 3-D model of ship scissor elevator was established with Pro/*** design of the mechanism was optimized in Pro/MECHANICA based on the findings from simulation *** has proved that the design is scientific and reasonable and could serve as the theoretical guidance and reference for the design of scissor mechanism of other uses.

摘要：A methodology for topology optimization based on element independent nodal density(EIND) is *** densities are implemented as the design variables and interpolated onto element space to determine the density of any point with Shepard interpolation *** influence of the diameter of interpolation is discussed which shows good *** new approach is demonstrated on the minimum volume problem subjected to a displacement *** rational approximation for material properties(RAMP) method and a dual programming optimization algorithm are used to penalize the intermediate density point to achieve nearly 0-1 *** are shown to meet stability,mesh dependence or non-checkerboard patterns of topology optimization without additional ***,the computational efficiency is greatly improved by multithread parallel computing with OpenMP.

摘要：High-speed machine tool working table restrains the machining accuracy and machining efficiency,so lightweight design of the table is an important *** nature,leaf has developed a plate structure that maximizes the surface-to-volume *** can be seen as a plate structure stiffened by *** with a high-speed machine tool working table,leaf veins play a role of supporting part which is similar to that of stiffening ribs,and they can provide some new design ideas for lightweight design of the *** this paper,distribution rules of leaf veins were investigated,and a structural bionic design for the table was achieved based on regulation of leaf ***,statistical analysis on geometric structure of leaf veins was carried out,and four distribution rules were ***,relevant mechanical models were developed and analyzed in finite element *** on the results from mechanical analysis on those relevant models,the four distribution rules were translated into the design rules and a structural bionic design for the working table was *** simulation and experimental verifications were carried out,and results showed that the average displacement of the working table was reduced by about 33.9%.

摘要：将4种分别含有微米或纳米固体粒子的磨合油应用在45号钢齿轮副磨合试验中，研究这2类粒子对齿轮磨合的影响及行为．研究中使用的2种微米粒子分别是平均粒径为10μm的碳酸钙和100μm的石英砂，2种纳米粒子分别是平均粒径为5nm的金刚石和30nm的导电炭黑，大齿轮和小齿轮未磨合前的齿面三维粗糙度分别是24．00μm和32．97μm．试验结果表明：微米粒子对磨合磨损的主要影响表现为磨粒磨损，且微粒的粒径越大，磨粒磨损越剧烈；纳米粒子对磨合磨损影响不大，但纳米粒子能够吸附、填充和渗入齿面，从而改观齿面形貌和改善齿面摩擦学性能．另外，在含有这2类粒子的磨合磨损中，摩擦副间都有不同程度的“负电阻”现象发生，且两齿轮的磨损率蒡越大，该电现象越明显．

摘要：A new cascade control program was proposed based on modified internal model control to handle stable,unstable and integrating processes with time *** program had totally four controllers of which the secondary loop had two controllers and the primary loop had two *** two secondary loop controllers were designed using IMC *** were decoupled completely and could be adjusted independently,which avoided the undesirable influence on performance of the primary *** main controller in the primary loop was devised as a PID using the method of minimum sensitivity,which could guarantee not only the nominal performance but also the robust stability of the system.A setpoint filter was added in the primary loop to improve the tracking *** the controllers of the two closed-loops were designed analytically,and could be adjusted and optimized by single parameter *** were carried out on three various processes with time delay,and the results show that the proposed method can provide a better performance of both set-point tracking and disturbance rejection and robustness against parameters perturbation.

摘要：作为能源密集型Haber-Bosch工艺合成氨的一种新兴替代品,电化学硝酸盐还原反应(NO_(3)RR)在可持续合成氨和废水处理方面受到了关注.然而,由于缺乏有效的电催化剂,NO_(3)RR目前仍然面临氨产率低和选择性差的问题.本文报道了通过脱合金法制备的纳米双模式孔Ru掺杂Cu催化剂作为NO_(3)RR的电催化剂,在-0.2 V versus RHE的电位下表现出29.63±0.74 mg h^(-1)mg_(cat.)^(-1)的超高氨产率与97.3%±2.5%的法拉第效率,优于大多数报道的催化剂.密度泛函理论计算表明,在Cu中掺杂Ru可以优化中间体的吸附能,降低NO_(3)RR速控步骤的能垒.此外,Ru原子可以促进H2O的吸附/解离,为含N中间体氢化为NH_(3)提供活性氢.这项工作为NO_(3)RR等过程进行高性能催化剂的合理设计提供了新的途径.

摘要：In order to improve performance of the DA465Q gasoline engine, a substantial amount of research was done to optimize its turbocharging system. The research led to the GT12 turbocharger being selected and its turbocharging parameters being settled. Based on these tests, rational matching was worked out for respective components of the turbocharging system. Results show that this turbocharger allows the engine to easily meet the proposed requirements for power and economic performance, giving insight into further performance improvements for gasoline engines.

摘要：Tin monosulfide(Sn S), which is composed of earth-abundant elements, holds promise as useful high-performance solar absorber and thermoelectric material. In addition to the ground-state Pnma phase, a series of metastable phases in different crystalline structures have been reported experimentally or theoretically, yet the phase stability diagrams remain elusive. In this article, we provide a comprehensive materials design study of new phases of Sn S using first-principles global optimization structure search calculations. We find that the two-dimensional layered phases are generally more energetically favored than the three-dimensional connected phases. In addition, we discover several new phases with comparable energetics. Four lower-energy phases show clear phonon stabilities evidenced by an absence of imaginary modes. The electronic band structures, carrier transport properties, and absorption spectra of the newly discovered phases are investigated and discussed toward potential applications for solar cells and thermoelectric devices.

摘要：纳米多孔金属作为电催化剂使用时表现出了优异的性能.我们报道了一种利用共熔镓铟合金和铜基底制备而成的自支撑铜铟双金属多孔异质结构材料.该多孔铜铟异质结构电催化剂具有良好的二氧化碳转化为合成气的性能.通过调整工作电压,可以使氢气和一氧化碳的比例控制在0.47–2.0之间.且该催化剂非常稳定,经过70小时连续测试后还可以保持96%的电流密度.密度泛函理论计算表明,得益于这种铜铟异质结构的存在,铜表面电荷发生了转变,形成了Cu^(δ)和Cu0等不同位点,从而协同作用分别增强了催化剂生成一氧化碳和氢气的能力.本工作可为多孔金属异质结构电催化剂的设计提供新思路.