基于LMedS&LS的全局运动估计算法

针对全局运动估计过程常伴有局部运动的问题,提出一种基于LMedS&LS的全局运动估计算法.通过获取相邻2帧图像上对应特征块的坐标,将该算法应用到仿射变换模型中,估计出全局运动参量,并根据运动参量采用双线性内插法完成图像配准.实验证明,该算法相对于LMedS算法在精确度和实效性2个方面都有改进.     

新庄孜选煤厂磁选机工艺效果评定

通过对新庄孜选煤厂磁选机使用情况及行业磁选机评定标准的评述,以344#精煤磁选机采样数据为例,分析了影响新庄孜选煤厂磁选机磁铁矿粉回收的关键因素,指导现场实践,充分发挥了该厂磁选机的介质回收作用。     

叠氮化铅半导体桥点火研究

利用半导体桥(Semiconductor Bridge,SCB)作为发火元件点燃叠氮化铅(Lead Azide,LA),获得了其电压电流曲线,通过分析其电压电流曲线和烧蚀后的桥面,发现两种不同的点火机理:当LA的颗粒较大时(45μm),利用SCB产生的等离子体将药剂点燃;当LA的颗粒较小时(1μm),SCB不产生等离子体就可以将药剂点燃。非等离子体点火时,其发火电压约为等离子体点火时的20%,降低了SCB的点火能量。此外,压药压力对非等离子体点火的最低发火电压有一定影响,80MPa时其发火电压最低。     

气体裂变产物88Kr的放化分离方法

为了制备满足88Kr核参数测量的样品,本工作研究了88Kr的放化分离方法。以85Kr、125Xe为放射性示踪剂研究了活性炭柱对Kr和Xe的吸附分离条件。结果显示,在0℃下Xe能被活性炭柱快速吸附而Kr不吸附。研制了一套适用于短寿命气体裂变产物分离的装置系统,使用辐照的铀靶进行了88Kr样品的分离。Kr的收率大于90%,Xe及I的去污因子大于1×104,整个操作过程可在5min内完成。     

1989～1993中国稀土工业

１９８９～１９９３中国稀土工业马鹏起（包头钢铁公司包头０１４０１０）众所周知，我国稀土工业在１９８９至１９９３年经历了一个漫长的调整时期，有人称之为“稀土低谷”，也有人说“稀土疲软”或“稀土滑坡”，这些说法都有一定的道理，但都不太确切和完整。这段时期...     

日本稀土工业的动态——来自中日稀土交流会议的报告

1988年10月17日至18日在东京召开了第一次中日稀土交流会议。由国家计划委员会副主任、国务院稀土领导小组组长叶青率领的中国稀土代表团一行10人参加了会议。第一天举行了小型交流会,由日本通产省资源能源厅长官镰田吉郎主持。镰田吉郎和叶青团长分别讲了话。日方资源能源厅矿业课课长松田宪和和非金属课课长光川宽介绍了日     

基于BP神经网络的虚拟机评估

排除无关变量的影响,采用BP神经网络对虚拟机性能数据的提取和分析,预测出已知配置虚拟机的具体应用性能。对样本数据进行分析与提取特征值,有良好的适应性;对虚拟机性能预测进行准确的阐释与说明,性能预测模型实现调控虚拟机对物理机资源池的占用,通过采集虚拟机配置与性能的数据来帮助使用和管理虚拟机。     

Torque Ripple Suppression Integrated Starter/Generator Control Strategy for Brushless Wound-Field Synchronous Motor

A flux linkage compensation field oriented control (FOC) method was proposed to suppress the speed and torque ripples of a brushless wound-field synchronous motor in its starting process. The starting process was analyzed and the model of wound-field synchronous electric machine was established. The change of field current of the electric machine was described mathematically for simplified exciter and rotate rectifier. Based on the traditional field control, the flux linkage compensation was introduced in d-axis current to counteract the flux ripple. Some simulation and preliminary experiments were implemented. The results show that the proposed method is feasible and effective.     

Torque Ripple Suppression Control Strategy for Brushless Integrated Starter/Generator Wound-Field Synchronous Motor

A flux linkage compensation field oriented control (FOC) method was proposed to suppress the speed and torque ripples of a brushless wound-field synchronous motor in its starting process. The starting process was analyzed and the model of wound-field synchronous electric machine was established. The change of field current of the electric machine was described mathematically for simplified exciter and rotate rectifier. Based on the traditional field control, the flux linkage compensation was introduced in d-axis current to counteract the flux ripple. Some simulation and preliminary experiments were implemented. The results show that the proposed method is feasible and effective.