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利用全站仪进行横断面测量及其精度分析 被引量:3
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作者 宋师珍 黄洪彬 《黑龙江水利科技》 2011年第5期95-95,共1页
在多年使用全站仪进行横断面测量及测量方法的指导下,通过对其测量方法的比较,并根据误差的来源,对精度进行分析,进而提出在横断面测量时为了达到精度要求而应该注意的问题。在全站仪出现之前,测量人员普遍采用丈量法,但此方法不但效率... 在多年使用全站仪进行横断面测量及测量方法的指导下,通过对其测量方法的比较,并根据误差的来源,对精度进行分析,进而提出在横断面测量时为了达到精度要求而应该注意的问题。在全站仪出现之前,测量人员普遍采用丈量法,但此方法不但效率低而且还存在诸多问题。例如,难于把握横断面的方向,往往造成较大的角度偏差;丈量误差会随着丈量次数的增加而逐步加大。如在地形变化比较大的山区,丈量法则满足不了测量成果的精度要求。实践证明,丈量误差对土石方估算的影响很大,目前横断面的测量普遍采用全站仪,从而大大提高了测量的效率和精度。 展开更多
关键词 全站仪 横断面 测量方 转站法 转站法 误差 精度分析
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From Chooz to the Ling'ao NPP:The Technology Transfer of Pressurized Water Reactor Technology from France to China
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作者 CHEN Yue LI Yunyi 《Chinese Annals of History of Science and Technology》 2024年第1期97-124,共28页
The transfer of pressurized water reactor(PWR)technology from France to China is an important event in the history of Sino-French scientific and technological relations.China has gradually achieved self-reliance in th... The transfer of pressurized water reactor(PWR)technology from France to China is an important event in the history of Sino-French scientific and technological relations.China has gradually achieved self-reliance in the field of PWR technology through the introduction and subsequent absorption of France's 900 MW reactors.Compared with the process of introducing and absorbing similar technology from the United States by France,China's experience has been more complicated.This circumstance reflects the differences in the nuclear power technology systems between the two countries.France's industrial strength and early acquisition of nuclear power technology laid a solid foundation for mastering PWR technology.On the other hand,although China established a weak foundation through the implementation of the"728 Project,"and tried hard to negotiate with France,the substantive content of the technology transfer was very limited.By way of the policy transition from"unhooking of technology and trade"to"integration of technology and trade,"China ultimately accomplished the absorption and innovation of PWR technology through the Ling'ao NPP. 展开更多
关键词 pressurized water reactor(PWR) technology transfer Sino-French relations Chooz NPP Daya Bay NPP Ling'ao NPP
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