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略谈英语教学中的“三回头”
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作者 叶孜姿 《琼州学院学报》 2010年第6期139-140,共2页
在英语教学过程中,教育工作者对自己的教学收集反馈信息,进行反思从而调节完善课堂教学是十分必要的。
关键词 “三回头” 教学反馈 教学反思
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STUDY OF NON-CONTACT MEASUREMENT OF FREE-FORM SURFACES
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作者 徐玉春 张国雄 +2 位作者 解则晓 冯国馨 王春海 《Transactions of Tianjin University》 EI CAS 2001年第4期226-228,共3页
A non contact three dimensional measurement method is presented in this paper.This system consists of a laser triangulation probe,a probe head and a coordinate measuring machine (CMM).The measurement principle of th... A non contact three dimensional measurement method is presented in this paper.This system consists of a laser triangulation probe,a probe head and a coordinate measuring machine (CMM).The measurement principle of the system is discussed,and a system calibration method employing a reference ball is proposed.The geometric model involving four frames is established to calculate the data points based on the reading of the laser probe and position information from the CMM.A measuring experiment for gesso free form surface using this system is carried out. 展开更多
关键词 free form surface coordinate measuring machine PH10 probe head laser triangulation probe CALIBRATION
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