为提高边坡结构面信息获取过程的安全性及测量结果的准确性,采用无人机多角度摄影测量获取结构面信息,得边坡结构面坐标以及出露迹线长.利用动态控制的相容Delaunay三角剖分对模型进行三角网格化,结合块体生成规则对边坡临空面出露块体...为提高边坡结构面信息获取过程的安全性及测量结果的准确性,采用无人机多角度摄影测量获取结构面信息,得边坡结构面坐标以及出露迹线长.利用动态控制的相容Delaunay三角剖分对模型进行三角网格化,结合块体生成规则对边坡临空面出露块体进行稳定性分析,识别坡面出露关键块体,并利用GeoSMA-3D系统验证方法的可行性及精度.研究结果表明:点云切割最大关键块体为38.574 8 m 3,GeoSMA-3D切割最大关键块体为38.561 7 m 3,位置均在坡体中央位置,拟合效果良好.对于不规则碎裂岩质边坡,三维点云切割可以更好地表征边坡的块体位置,对于指导关键块体治理具有一定优势.展开更多
A new pumping-probing scheme for the optically pumped cesium beam frequency standard has been experimentally tested in our laboratory.The stability of the optically pumped cesium beam frequency standard was measured b...A new pumping-probing scheme for the optically pumped cesium beam frequency standard has been experimentally tested in our laboratory.The stability of the optically pumped cesium beam frequency standard was measured by comparing its 10 MHz output with an HP5071A commercial cesium atomic clock.The result shows that the frequency stability for the 1 s and 30000s sample times are 1.2×10^(-11) and 3.7×10^(-13),respectively.It was proved that the new pumping scheme works well.展开更多
文摘为提高边坡结构面信息获取过程的安全性及测量结果的准确性,采用无人机多角度摄影测量获取结构面信息,得边坡结构面坐标以及出露迹线长.利用动态控制的相容Delaunay三角剖分对模型进行三角网格化,结合块体生成规则对边坡临空面出露块体进行稳定性分析,识别坡面出露关键块体,并利用GeoSMA-3D系统验证方法的可行性及精度.研究结果表明:点云切割最大关键块体为38.574 8 m 3,GeoSMA-3D切割最大关键块体为38.561 7 m 3,位置均在坡体中央位置,拟合效果良好.对于不规则碎裂岩质边坡,三维点云切割可以更好地表征边坡的块体位置,对于指导关键块体治理具有一定优势.
基金Supported by the National Natural Science Foundation of China under Grant No.69678031the Foundation for University Kay Teacher by the Education Ministry of China。
文摘A new pumping-probing scheme for the optically pumped cesium beam frequency standard has been experimentally tested in our laboratory.The stability of the optically pumped cesium beam frequency standard was measured by comparing its 10 MHz output with an HP5071A commercial cesium atomic clock.The result shows that the frequency stability for the 1 s and 30000s sample times are 1.2×10^(-11) and 3.7×10^(-13),respectively.It was proved that the new pumping scheme works well.
