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基于SPOT-VGT NDVI的西藏羊卓雍错流域地表覆被变化研究
SPOT-VGT NDVI 时空变化 气候因子 羊卓雍错流域
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2011/4/22
利用1998年—2007年SPOT-VGT NDVI植被指数，分析了羊卓雍错流域NDVI时空变化特征及其与主要气候因子(气温，降水)的相关关系。结果表明：时间上，流域平均NDVI年内季节变化明显，变化幅度在0.12～0.31之间，5月份开始较快上升，最高值出现在9月份。1998—2007年10年间，羊卓雍错流域NDVI的多年平均值为0.19，总体上呈缓慢上升的趋势，表明流域的生态环境有改善的趋势。...
In-Process Monitoring and Adaptive Control in Laser Micro-Spot Welding of Copper
Micro-spot welding of copper Combined laser beams In-process monitoring
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2009/6/9
A new procedure of in-process monitoring and adaptive control is developed for micro-spot welding of 0.1-mm-thick copper sheets with combined beams of an AO Q-switched second harmonic YAG laser and a ...
In-Process Monitoring and Adaptive Control in Laser Micro-Spot Lap Welding of Aluminum Alloy -Adaptive Control by Heat Radiation for Partially-Penetrated Welding-
Aluminum alloy In-process monitoring Adaptive control
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2009/6/8
This paper presents a new procedure for in-process monitoring and adaptive control that has been developed for micro-spot lap welding of A3003 aluminum alloy sheets of 0.1 mm and 1 mm in thickness. Th...