带电沙粒的跃移云数值模型

给出吹过无限大平坦沙面的稳定风场中风、跃移沙粒及静电力相互耦合的方程 ,并用简化的沙粒——床面碰撞模型求解了方程 .计算结果表明静电力对沙粒跃移轨道及贴地风速有强烈影响 ,当跃移沙粒的带电量为 - 6 0 μC/ kg时 ,计算所得的跃移层中风速沿高程分布与实验结果相吻合     

Evidence for transmission of aphid-pathogenic fungi by migratory flight of Myzus persicae alates

The alates of the green peach aphid, Myzus persicae, were daily trapped from the air from late October through early January and carried to laboratory for determination of fungal infection by individually rearing them for 7 d on detached cabbage leaves in Petri dishes. Among 760 alates trapped, 266 (35%) were found carrying various fungal pathogens, 87.3% of them died due to mycosis during the first 3-day period of rearing and the rest died in the following two days. Most of the deaths of the alates were attributed to entomophthoralean fungi, taking 94.4%, and the rest were the hyphomycetous fungus Beauveria bassiana. Among the Entomophthorales-killed alates, P. neoaphidis took a proportion of 66.1%, Z. anhuiensis 22.6%, E. planchoniana 9.7%, and N. fresenii 1.6%, respectively. Two alates were found suffering from cross infection of two fungal species, i.e. P. neoaphidis with Z. anhuiensis and N. fresenii, respectively. The results represent the first report on transmission of aphid-pathogenic fungi by M. persicae alates through migratory flight.     

Evidence for transmission of aphid-pathogenic fungi by migratory flight of Myzus persicae alates

The alates of the green peach aphid, Myzus persicae, were daily trapped from the air from late October through early January and carried to laboratory for determination of fungal infection by individually rearing them for 7 d on detached cabbage leaves in Petri dishes. Among 760 alates trapped, 266 (35%) were found carrying various fungal pathogens, 87.3% of them died due to mycosis during the first 3-day period of rearing and the rest died in the following two days. Most of the deaths of the alates were attributed to entomophthoralean fungi, taking 94.4%, and the rest were the hyphomycetous fungus Beauveria bassiana. Among the Entomophthorales-killed alates, P. neoaphidis took a proportion of 66.1%, Z. anhuiensis 22.6%, E. planchoniana 9.7%, and N. fresenii 1.6%, respectively. Two alates were found suffering from cross infection of two fungal species, i.e. P. neoaphidis with Z. anhuiensis and N. fresenii, respectively. The results represent the first report on transmission of aphid-pathogenic fungi by M. persicae alates through migratory flight.     

基于轨迹平行测量的发动机异响诊断方法

为了利用机器的声（异响）信号进行故障识别，提出了一种异响信号的故障诊断思路，首先利用连续小波消噪技术对声信号进行消噪和故障源识别，然后将混沌技术中的轨迹平行测量方法应用于异响信号的非平稳特征提取与识别，提取出时间序列动力学轨道运行特征指标，经过对发动机的故障声信号进行实际应用后，表明该方法具有良好的识别效果，为声音信号的故障诊断提供了一种新的工具。     

转动参照系中的圆锥摆

讨论了在转动参照系中考虑科里奥利力的作用后，圆锥摆运动的轨迹、半径、速度和周期，并与惯性系中的圆锥摆进行了比较，在转动参照后，若摆锤以惯系中锥摆的初速度和半径开始运动，则其轨迹是椭圆，轨迹以一定的周期顺时针方向转动；若分别以惯性系中的初速度和半径开始作圆周运动，则半径和速度都与惯性系中的不同；在摆锤作逆时针和顺时针方向运动时，以上情况也不相同。     

离子光学系统象差系数的计算机辅助推导

本文讨论了离子光学系统中离子轨迹方程的特点和逐次逼近求解法。利用人工智能语言的符号运算功能,提出了计算机推导象差系数的新方法。并举非均匀磁场(主场)轴向三阶象差系数为例,以示此方法的实用意义。     

机器人离线编程中的机器人语言界面

本文讨论了机器人离线编程系统HOLPS中的机器人语言人机界面.该机器人语言(HOLPS语言)具有VAL语言的基本功能,允许用户选择多种轨迹规划算法,提供机器人运动学正反解自动生成功能,具有静止编程动态运动功能.HOLPS语言界面采用下拉式菜单和弹出式窗口管理,除以键盘为主进行操作外并配有鼠标器操作,对机器人程序主要以解释方式执行.     

回转分离器内气固两相流的理论分析

详细地推导了回转分离器内颗粒的运动方程,对分离器内颗粒的运动轨迹.特别是在考虑颗粒形状对阻力影响的情况下作了一定程度的计算,将计算结果与球形颗粒运动轨迹进行了比较,并作了适当的分析.此外,还较为详细地介绍了此类问题的数值求解方法.     

基于加速度传感器的机器人最优学习控制

为工业机器人提出了一种最优学习控制法。这种控制法用加速度误差校正驱动器运动。并提出了一种基于几何级数的极限条件估计学习控制过程收敛条件的理论方法。所提出学习控制法的有效性通过PUMA562机器人的计算机仿真结果得到了证实。     

真空开关在分断过程中电弧引燃过程研究

为了深入了解真空电弧的引燃过程，测量了直流真空电弧起弧阶段的电弧电压，屏蔽罩电位以及屏蔽罩收集的离子电流等参数，分析了真空电弧的引燃过程，起弧后等离子体的扩散过程，以及纵磁场对等离子体扩散的影响。