小型风冷柴油机的发展方向

本文论述了轻量化、低油耗、低振动、低噪声、低排污、低成本、易起动与高寿命是小型风型柴油机发展的必然趋势,并提出了实现这一目标的技术措施和理论依据.     

具有谐振腔的多波切伦柯夫振荡器的粒子模拟

 设计了一种新型的多波切伦柯夫振荡器，即在第二慢波段和输出喇叭之间加一个谐振腔，并采用PIC方法模拟了器件产生微波的物理过程。结果表明这种新型器件符合普通多波切伦柯夫振荡器的基本特征，同时具有纵向尺寸短，导引磁场低，功率、效率高等优点。     

小型风冷柴油机的机械损失

本文介绍了作者应用电拖动实验法验证了计算柴油机机械损失的各种经验公式的准确性。并提出了减少机械损失的对策.     

Effect of void formation during MEVVA tungsten ion implantation on the microstructure and surface properties of H13 die steel

H13 die steel was implanted with tungsten using a metal vapour vacuum arc (MEVVA) ion source. When the pulsed beam current density of tungsten ions increased to 6mA?cm^-2, some voids appeared in the high voltage electron microscope (HVEM) micrograph, which would disappear at an annealing temperature of 600℃. HVEM and x-ray diffraction were used for observing the phase structure of the annealed and un-annealed H13 steel after the steel was implanted. Results of wear and hardness tests indicated that whether the voids appear significantly influences the hardness and wear of H13 steel. Reasons for the formation of voids and the relation between the surface mechanical property and voids are discussed in terms of collision theory.     

An Extended Enterprise Modeling Approach to Enterprise—based Integration

The paradigm of extended enterprise is the core competency focused.An extended enterprise expands its scope from bounding a single enterprise to including additional processes performed by other enterprises.The integration of processes is enterprise based.This paper proposes a recursive enterprises interconnected chain model for the extended enterprise,and presents an enterprisebased integration framework for the extended enterprise .The case study is based on a motorcycle group coporation.     

不同周期信号激励下分数阶线性系统的响应特性分析

研究了含分数阶导数阻尼的一类线性系统在不同周期信号激励下系统的响应问题.首先在简谐信号的激励下,利用谐波平衡法得到了系统响应的近似解,这一结果和已有文献(申永军,杨绍普,邢海军2012物理学报61 110505)的结果完全相同,但本文的求解过程大为简化,而且本文进一步扩展了分数阶导数阻尼微分阶数的取值范围.接着,利用傅里叶级数展开法和线性系统的叠加原理,求得了一般周期信号激励下系统响应的近似解,并以周期方波信号和周期全波正弦信号为例进行了说明.本文的结果表明,分数阶导数阻尼的微分阶数影响系统响应中各阶谐波的共振频率和共振振幅.系统响应的幅值与分数阶导数阻尼的微分阶数之间的单调关系主要受外激信号频率的影响.除解析分析外,本文还用数值模拟对相关结论进行了验证,两种结果符合良好,表明本文的分析方法是可行的.     

积分分离PID控制实验的参数计算及调试

论述积分分离PID控制实验的参数计算及调试方法。     

引入夸克中程势计算核力

本文在夸克唯象势中加入了中程势.核力由夸克交换效应势和单π交换势共同决定.计算了四种通道N—N势的中心部分,结果除能说明核力的短程性、饱和性之外,在偶道有较强吸引,TE道N—N势的极小值为-51.5MeV.与两种唯象势进行了比较.     

最少拍控制系统实验的参数计算

本文介绍了最少拍控制系统实验的参数计算。