Improved Algorithm for Solving Inverse Kinematics of Biped Robots

Mobile Networks and Applications - Inverse kinematics is an important basic theory in walking control of biped robot. This study focuses on the parameter setting using the improved algorithm in...     

Approximation Optimal Vibration Control with Applications to Jacket Offshore Platforms with Nonlinear Dynamic Characteristics

International Journal of Control, Automation and Systems - The vibration control problem of offshore jacket platforms is studied. The model of offshore platforms with nonlinear interactions of the...     

纳米氧化物对水泥基料化学收缩的影响

采用ASTM化学收缩试验方法,研究纳米SiO2、MgO、Al2O3对水泥基材料化学收缩变化的影响,明确纳米材料种类的差异性。结果表明,各实验组水泥基材料化学收缩均经历三阶段:急速变化区、缓慢变化区、平稳区,7d始水泥基材料化学收缩基本稳定。几种纳米材料的最佳掺量对水泥基材料的化学收缩改善作用大小为:SiO2>Al2O3>MgO。研究发现,纳米材料种类和掺量的不同对化学收缩的影响也较大,在选用时,需综合考虑。     

Fabrication and microwave absorption properties of magnetite nanoparticle–carbon nanotube–hollow carbon fiber composites

Absorbents with “tree-like” structures, which were composed of hollow porous carbon fibers (HPCFs) acting as “trunk” structures, carbon nanotubes (CNTs) as “branch” structures and magnetite (Fe₃O₄) nanoparticles playing the role of “fruit” structures were prepared by chemical vapor deposition technique and chemical reaction. Microwave reflection loss, permittivity and permeability of Fe₃O₄–CNTs–HPCFs composites were investigated in the frequency range of 2–18 GHz. It was proven that prepared absorbents possessed the excellent electromagnetic wave absorbing performances. The bandwidth with a reflection loss less than −15 dB covers a wide frequency range from 10.2 to 18 GHz with the thickness of 1.5–3.0 mm, and the minimum reflection loss is −50.9 dB at 14.03 GHz with a 2.5 mm thick sample layer. Microwave absorbing mechanism of the Fe₃O₄–CNTs–HPCFs composites is concluded as dielectric polarization and the synergetic interactions exist between Fe₃O₄ and CNTs–HPCFs.     

Yolk–shell structured iron carbide/N-doped carbon composite as highly efficient and stable oxygen reduction reaction electrocatalyst

We report a simple route to synthesize iron carbide/carbon yolk–shell composite via a facile two-step process including polymerization of pyrrole using Fe₃O₄ as a sacrificial template to form a Fe₃O₄/polypyrrole composite, followed by annealing at high temperature in N₂ atmosphere. The yolk–shell composite, with iron carbide (Fe_2.5C) embedded in nitrogen-doped carbon layers, shows impressively high catalytic activity and stability for oxygen reduction reaction in alkaline solution. Both the pyridinic-N and graphic-N in the shell of Fe₃O₄–PPy-700, together with the Fe_2.5C confined in carbon layers are believed to be the active sites for the ORR.     

E-voting scheme using secret sharing and K-anonymity

E-voting maybe replaces the traditional voting scheme in the future, however, the security threat must be paid enough attention. In this paper, a novel e-voting scheme is proposed using secret sharing and k-anonymity, which not only satisfies the basic security goals such as the non-cheating, the universal verifiability, the confidentiality, and the anonymity, but also achieves the addition properties including coercion-resistance and unconditional security since the security of the proposed scheme does not rely on any computational hard problem.

     

非常规蛋白基木材胶黏剂研究现状及发展前景

介绍了动物和植物型非常规蛋白资源的种类及其制备蛋白基木材胶黏剂的研究现状和存在的问题,展望了非常规蛋白胶黏剂的发展前景。     

DPCM编码在图像压缩中的应用

DPCM编码（差分脉冲编码调制）是一种线性预测编码。在二维图像中,由于相邻像素间的相关性很强,所以图像数据的冗余度都很大。对于瞬时斜率比较大和传输速度要求比较高的信号场合,为了使相邻像素间的相关性减小,通常采用DPCM编码技术对图像进行压缩。通过MATLAB仿真,表明DPCM编码能有效地对图像进行压缩。     

基于模板的．Net三层架构的代码自动生成

三层架构是数据库开发中最常用的分层架构。三层结构能够提高代码重用率,降低项目开发难度。为了解决手工编写三层架构的代码工作量大且容易出错的问题,使用．Net平台提供的动态编译和反射技术,设计并实现了基于可定制模板的自动代码生成器。该代码生成器利用三层架构的代码依赖数据库的架构信息这一特点,以数据库架构信息、Xml配置文件和模板文件作为输入,输出三层架构的各层代码。用户可以修改Xml配置文件的内容和使用该代码生成器提供的模板语言定制、修改自己的模板文件,方便、灵活地控制输出的目标代码。代码生成器的使用在实际的项目开发中具有重要的意义。