Comparison of prototype and rote instruction of English names for Chinese visual characters

This study compared prototype and rote instruction of English names for Chinese visual characters. In the prototype condition, participants were taught the meaning of the prototype that served as the distinctive feature of multicomponent characters. In the rote condition, participants traced the character and wrote its translation. Participants learned more rapidly and maintained more words in the prototype condition.     

坐便器与水箱配件在标准中的配套性要求

详细介绍了坐便器与水箱配件在新标准中的配套性技术要求,分析了2种产品配套性指标和相关的检测方法。     

Topological current structure of dislocations in the 4-dimensional gauge field theory of disclocation and disclination continuum

The topological current structure of dislocations is studied by means of decomposition of gauge potential in the 4-dimensional gauge field theory of dislocation and disclination continuum. The dislocations in defect continuum are globally classified in terms of winding numbers and locally characterized by Brouwer degrees and Hopf indices. It is shown that the topological dislocation current corresponds to the motion current of a set of strings, in which the strings are just the dislocation lines. And the topological dislocation current can be expressed as the cross product of the topological disclocation density and the velocity of the strings.     

宽带钢冷轧机颤振控制的数值模拟

本文以较为准确的轧机振动状态下的轧制压力模型为基础，对宽带钢冷轧机干摩擦阻尼减振进行了数值模拟的研究。研究结果与实际观测值相等。     

特种钢用结晶器铜管破裂原因分析

通过对某特钢厂破裂的结晶器铜管进行金相实验、扫描电镜和能谱分析,并结合结晶器的生产、使用及失效过程情况,综合受力分析,认为铜管破裂原因主要是环境介质硫渗入形成硫化物,在拉应力作用下,裂纹沿脆性质点扩展导致的破坏。     

CAD／CAPP并行集成理论及系统研究

并行工程作为一个新的设计哲理在工程实践中的实现手段不尽相同，本文中我们提出了ＣＡＤ／ＣＡＰＰ并行集成概念，并开发了原型系统ＣＥＣＡＤＰ，初步实现了一种并行设计的运行模式。     

计算机网络安全问题及防范对策

文章简单阐述了当前计算机网络所面临的主要安全威胁,并在此基础上提出了分层控制的方案,建立了不同层次间网络安全的防范措施,希望以此来提高网络安全性。     

Output chattering attenuation between two tracking controllers

In this paper, an output chattering attenuation scheme is proposed for two tracking controllers. The controllers have integral actions and are used to eliminate the steady-state tracking errors. By designing a compensator and reducing the discontinuous switching, the output chattering at the switching points can be attenuated significantly. Moreover, combining with the generalized Kalman-Yakubovich-Popov (KYP) lemma and the parameter-dependent Lyapunov function method, this problem can be characterized in terms of linear matrix inequality (LMI) formulation. Finally, the simulation results demonstrate the effectiveness of the proposed method.