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北京谱仪-Ⅱ主漂移室干扰噪声的研究 被引量:2
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作者 王运永 王少敏 +17 位作者 毛慧顺 刘荣光 宋晓非 李金 李卫国 李小南 李如柏 吕军光 张健 张德红 金艳 杨杰 黄俊东 柯尊建 高树琦 谢佩佩 顾建辉 颜洁 《核电子学与探测技术》 CAS CSCD 北大核心 1999年第3期201-205,共5页
研究了北京谱仪-Ⅱ主漂移室干扰噪声(pick-up噪声)的主要表现形式,分析了噪声的来源,提出了解决办法。
关键词 北京谱仪 主漂移室 pick-up噪声 干扰噪声
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旋转脱膜式残膜回收机关键部件仿真与模态分析 被引量:3
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作者 郑士琦 王敏 +5 位作者 营雨琨 卢勇涛 王吉亮 秦朝民 何玉泽 李净凯 《农机化研究》 北大核心 2022年第4期37-43,共7页
设计了一种旋转脱膜式残膜回收机具,针对搂膜弹齿不稳定造成残膜回收率降低的问题,通过Ansys软件对其进行仿真分析和模态分析,得出主搂膜弹齿等效最大应力232.15MPa,总位移为10.2mm,副搂膜弹齿等效最大应力138.737MPa、总位移为6.7mm,... 设计了一种旋转脱膜式残膜回收机具,针对搂膜弹齿不稳定造成残膜回收率降低的问题,通过Ansys软件对其进行仿真分析和模态分析,得出主搂膜弹齿等效最大应力232.15MPa,总位移为10.2mm,副搂膜弹齿等效最大应力138.737MPa、总位移为6.7mm,所得数据均小于设计最大值;二者前6阶固有频率范围分别为17.7~292.1Hz和25.1~292.1Hz,不在所受外界激振频率范围内,作业过程中不会产生共振现象。本研究可为弹齿式残膜回收机的设计提供参考。 展开更多
关键词 残膜回收机 弹齿式捡拾部件 仿真分析 模态分析
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Learning taxis' cruising patterns with Ripley's K function
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作者 宗芳 张慧永 LI Hai-fan 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第9期3677-3682,共6页
Taxi drivers' cruising patterns are learnt with GPS trajectory data collected in Shenzhen, China. By employing Ripley's K function, the impacts of land use and pick-up experience on taxis' cruising behavio... Taxi drivers' cruising patterns are learnt with GPS trajectory data collected in Shenzhen, China. By employing Ripley's K function, the impacts of land use and pick-up experience on taxis' cruising behavior are investigated concerning about both intensity of influence and radius of influence. The results indicate that, in general, taxi drivers tend to learn more from land use characteristics than from pick-up experience. The optimal radius of influence of land use points and previous pick-up points is 14.18 km and 9.93 km, respectively. The findings also show that the high-earning drivers or thorough drivers pay more attention to land use characteristics and tend to cruise in high-density area, while the low-earning drivers or focus drivers prefer to learn more from previous pick-up experience and select the area which is far away from the high-density area. These findings facilitate the development of measures of managing taxi's travel behavior by providing useful insights into taxis' cruising patterns. The results also provide useful advice for taxi drivers to make efficient cruising decision, which will contribute to the improvement of cruising efficiency and the reduction of negative effects. 展开更多
关键词 TAXI cruising patterns land use pick-up points
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