期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Comparison of Visibility Measurements over Horizontal Path by Micro-pulsed Lidar and Visibility Meter 被引量:3
1
作者 GUO Jinjia SUN Zhaobin LIU Zhishen 《Journal of Ocean University of China》 SCIE CAS 2007年第3期315-318,共4页
As a powerful tool to scan the atmosphere, the I idar can derive visibility values by directly collecting the backscattering laser light from the atmosphere. Simultaneous measurements of atmospheric visibility by Micr... As a powerful tool to scan the atmosphere, the I idar can derive visibility values by directly collecting the backscattering laser light from the atmosphere. Simultaneous measurements of atmospheric visibility by Micro-pulsed lidar (MPL) and a commercial visibility meter (VM) NQ-1 have been performed to evaluate the feasibility of the MPL system designed by the Ocean Remote Sensing Laboratory (ORSL) of the Ocean University of China (OUC) from October 21 2005 to November 21 2005 in the Shilaoren Sightseeing Garden on the Qingdao coast. All the 880 data samples obtained by the two instruments have high correlation coefficients (up to 0.86), which indicates it is feasible to utilize MPL to measure atmospheric visibility. 展开更多
关键词 VISIBILITY micro-pulsed lidar visibility meter extinction coefficient AEROSOL
下载PDF
Multipacting analysis in micro-pulse electron gun
2
作者 廖浪 张猛 +2 位作者 顾强 方文程 赵明华 《Chinese Physics C》 SCIE CAS CSCD 2013年第11期84-87,共4页
Modeling multipacting to steady state saturation is of interest in determining the performance of the micro-pulse electron gun. In this paper, a novel method is proposed to calculate the multipacting resonance param- ... Modeling multipacting to steady state saturation is of interest in determining the performance of the micro-pulse electron gun. In this paper, a novel method is proposed to calculate the multipacting resonance param- eters for the gun. This method works well, and the 2-D simulation results suggest that steady state saturation can be achieved in the gun. After saturation the transition from two-surface multipacting to single-surface multipacting occurred, and an extensive range of electron emission time is a suggested way to avoid this kind of transition. 展开更多
关键词 multipacting micro-pulse electron gun MultiPac VORPAL
原文传递
Multipacting saturation in parallel plate and micro-pulse electron gun
3
作者 廖浪 张猛 赵明华 《Chinese Physics C》 SCIE CAS CSCD 2015年第2期70-76,共7页
A novel parallel plate model is proposed that divides the electron cloud into three parts at saturation, and it is studied in detail using both an analytical approach and particle-in-cell (PIC) code simulations. As ... A novel parallel plate model is proposed that divides the electron cloud into three parts at saturation, and it is studied in detail using both an analytical approach and particle-in-cell (PIC) code simulations. As one part of the electron cloud, ribbons modes are suggested by tracking the trajectory of individual particles, and the aim of this mode form is to simplify the progress of the multipacting effect in the parallel plate so as to be eliminated by optimizing RF parameters. The micro-pulse electron gun (MPG) has demonstrated the potential to address the need for high peak and average current electron beams, hence studying the multipacting in MPG is essential. On the basis of studying multipacting in the parallel plate, it is clear that increasing the cavity voltage is of interest in yielding high quality beams in the gun. 展开更多
关键词 multipacting parallel plate micro-pulse electron gun electron source
原文传递
Measuring boundary-layer height under clear and cloudy conditions using three instruments 被引量:2
4
作者 Chenggang Wang Hongrong Shi +2 位作者 Lianji Jin Hongbin Chen Huayang Wen 《Particuology》 SCIE EI CAS CSCD 2016年第5期15-21,共7页
Boundary-layer height (BLH) under clear, altostratus and low stratus cloud conditions were measured by GPS sounding, wind profiler radar, and micro-pulse lidar during the atmospheric radiation measurement experiment... Boundary-layer height (BLH) under clear, altostratus and low stratus cloud conditions were measured by GPS sounding, wind profiler radar, and micro-pulse lidar during the atmospheric radiation measurement experiment from Sep. to Dec. 2008 in Shouxian, Anhui, China. Results showed that during daytime or nighttime, regardless of cloud conditions, the GPS sounding was the most accurate method for measuring BLH. Unfortunately, because of the long time gap between launchings, sounding data did not capture the diurnal evolution of the BLH. Thus, wind profile radar emerged as a promising instrument for direct and continuous measurement of the mixing height during the daytime, accurately determining BLH using the structure parameter of the electromagnetic refractive index. However, during nighttime, radar was limited by weak signal extraction and did not work well for determining the BLH of the stable boundary layer, often recording the BLH of the residual layer. While micro-pulse lidar recorded the evolution of BLH, it overestimated the BLH of the stable boundary layer. This method also failed to work under cloudy conditions because of the influence of water vapor. Future work needs to develop a method to determine BLH that combines the complimentary features of all three algorithms. 展开更多
关键词 Boundary-layer height Atmospheric radiation measurement experiment GPS sounding Wind profile radar micro-pulse lidar
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部