三阶张弛振子的临界行为

本文报道最简单三阶张弛振子的实验电路、映象描述,及对其从准周期向混沌过渡的临界行为的实验研究,并说明了这些临界行为的普遍意义。我们测得沿临界线准周期集的分数维为:D=0.88±0.01;以及当绕数逼近黄金分割比时,映象参数的收敛比平均值为:■-2.85±0.1。这些结果与圆映象理论很好地符合,从而对Cumming等人得出的D=0.795±0.005及δ_n 的值在-3.3±0.1与-2.7±0.2之间的结论作了较圆满的解释。     

回归正交优化法在摩擦焊接工艺中的应用

本文用回归正交优化法进行摩擦焊试验和计算,建立了摩擦焊工艺参数的回归方程,并用方程和曲线图分析了摩擦焊工艺参数对焊接质量与机械性能的影响。为摩擦焊工艺参数的选择提供了一种新方法,为实现摩擦焊生产的计算机控制提供了数学模型。     

论超现实主义艺术

通过举例对人物布雷东等人的描绘，以说明超现实主义艺术。     

浅谈教学中如何培养学生的创造性思维

结合笔者多年教学经验,阐述了在实际教学过程中培养学生创新性思维的重要性,并提出培养学生创新性思维的方法.     

Design and implementation of DBC based on dynamic AOP

Traditional approach of design by contract, due to mixing the contract code with application code, is difficult for the extensibility and reusability of software system. This paper presents a framework named JADBC for design by contract based on Aspect-Oriented Programming (AOP) to resolve these problems. By providing a new modularized element, aspect, the framework successfully separates the contracts in design by contract, from functional codes. The implementation of this framework is based on dynamic AOP which can have the contract changed at runtime, consequently, enhancing program flexibility. JADBC framework modularizes the contracts in a clear-cut fashion that is easier to design, implement, and maintain. Biography: WEN Jing (1982–), female, Ph.D. candidate, research directions: software engineer, aspect-oriented software development.     

燃气机热泵控制系统实验研究

应用先进流量控制策略研制了燃气机热泵PLC控制系统,采用增量式PID和模糊控制方法进行实验分析.结果表明,在正常运行阶段,增量式PID控制方法能够满足实验要求,但在大范围变工况情况下,适用性不强;而模糊控制则能较好地适应燃气机热泵系统的变容量调节,易于实现系统的优化运行.     

石渣填筑路基的施工工艺及质量控制

文章结合岚古线公路石渣路基的试验与施工情况，对石渣填筑路基的施工工艺和质量控制进行了探讨。     

S-rough sets and the discovery of F-hiding knowledge

Singular rough sets (S-rough sets) have three classes of forms: one-directional S-rough sets, dual of one-directional S-rough sets, and two-directional S-rough sets. Dynamic, hereditary, mnemonic, and hiding properties are the basic characteristics of S-rough sets. By using the S-rough sets, the concepts of f-hiding knowledge, F-hiding knowledge, hiding degree, and hiding dependence degree are given. Then, both the hiding theorem and the hiding dependence theorem of hiding knowledge are proposed. Finally, an application of hiding knowledge is discussed.     

试论教育的生命基础

文章探讨了生命教育提出的背景和意义,论述了生命教育的历史和现状,讨论了生命教育的界定、内涵、目标和内容,以期望能对当前生命教育有进一步的认识和启发.