针对小型或中等规模物体,在对配准精度要求较高且处理时间受限的场景下,采用两个配准算法叠加的策略,兼顾配准精度和运行效率,提出一种基于快速全局配准(Fast Global Registration,FGR)与点到面迭代最近点(Iterative Closest Point,ICP...针对小型或中等规模物体,在对配准精度要求较高且处理时间受限的场景下,采用两个配准算法叠加的策略,兼顾配准精度和运行效率,提出一种基于快速全局配准(Fast Global Registration,FGR)与点到面迭代最近点(Iterative Closest Point,ICP)相结合的点云配准方法。对点云进行体素下采样和法线估计以完成预处理;利用快速点特征直方图结合FGR实现粗配准,获得初始效果,且仅进行一次特征提取以提高效率;采用点到面点云精配准算法完成精配准。实验结果表明,所提方法在配准精度上优于其他3种对比算法,且运行时间显著缩短,具有稳定性。展开更多
To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat ; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish ...To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat ; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish model of FGR by a way of passive smoking: giving the maternal rats different agent of magnesium sulfate by subcutaneous injection: low agent group (300 mg/kg), high agent group (600 mg/kg). Concentration of magnesium sulfate was monitored. The expression of caspase-3 was measured by RT-PCR and immunohistochemistry technology. Both of the concentrations of magnesium sulfate in high and low agents group are higher than the FGR group (P〈0.01);the weight of the placenta and fetal rat in high agent group are higher than the FGR group (P〈0.05 and P〈0. 01) ; the expression of mRNA and protein of caspase-3 in the two agent group is higher than the FGR group (P〈0.05 respectively) ; concentration of magnesium sulfate in the maternal rat blood correlate to the weight of fetal rat (r=0. 899, P=0. 038) and the expression of caspase-3 in the placenta of maternal rat (r=-0. 747, P=0. 033; r=-0. 915, P=0. 001). The research suggests that the weight of fetal rat could be increased by treatment of magnesium sulfate. Because it would imfrmove the placental function by depressing the expression of caspase-3.展开更多
The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent yea...The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent years there are a large number of scientists who are engaged in this research both at home and abroad.展开更多
摘要针对小型或中等规模物体,在对配准精度要求较高且处理时间受限的场景下,采用两个配准算法叠加的策略,兼顾配准精度和运行效率,提出一种基于快速全局配准(Fast Global Registration,FGR)与点到面迭代最近点(Iterative Closest Point,ICP)相结合的点云配准方法。对点云进行体素下采样和法线估计以完成预处理;利用快速点特征直方图结合FGR实现粗配准,获得初始效果,且仅进行一次特征提取以提高效率;采用点到面点云精配准算法完成精配准。实验结果表明,所提方法在配准精度上优于其他3种对比算法,且运行时间显著缩短,具有稳定性。
摘要To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat ; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish model of FGR by a way of passive smoking: giving the maternal rats different agent of magnesium sulfate by subcutaneous injection: low agent group (300 mg/kg), high agent group (600 mg/kg). Concentration of magnesium sulfate was monitored. The expression of caspase-3 was measured by RT-PCR and immunohistochemistry technology. Both of the concentrations of magnesium sulfate in high and low agents group are higher than the FGR group (P〈0.01);the weight of the placenta and fetal rat in high agent group are higher than the FGR group (P〈0.05 and P〈0. 01) ; the expression of mRNA and protein of caspase-3 in the two agent group is higher than the FGR group (P〈0.05 respectively) ; concentration of magnesium sulfate in the maternal rat blood correlate to the weight of fetal rat (r=0. 899, P=0. 038) and the expression of caspase-3 in the placenta of maternal rat (r=-0. 747, P=0. 033; r=-0. 915, P=0. 001). The research suggests that the weight of fetal rat could be increased by treatment of magnesium sulfate. Because it would imfrmove the placental function by depressing the expression of caspase-3.
摘要The work of quantitative studying the effect of technological progress on economic growth, being of great complexity and far-reaching significance, has become a quite popular research topic in the world. In recent years there are a large number of scientists who are engaged in this research both at home and abroad.