针对经典的基于球面反卷积的体素内纤维走向分布估计方法对噪声非常敏感的问题,提出一种非凸正则球面反卷积方法。该方法基于邻域体素间纤维走向分布的相似性构造非凸空间正则项,采用改进的Richardson-Lucy算法求解非凸正则反卷积问题。基于二张量数据和HARDI模型数据进行仿真,结果表明,与经典的球面反卷积方法和全变分正则化球面反卷积方法相比,所提出的方法估计结果的平均角度误差分别降低了约52%和9
In laser-pointing-related applications, when only the centroid of a laser spot is considered, then the position and angular errors of the laser beam are often coupled together. In this study, the decoupling of the position and angular errors is achieved f
We report on the design and first results from experiments looking at the formation of radiative shocks on the Shenguang-II (SG-II) laser at the Shanghai Institute of Optics and Fine Mechanics in China. Laser-heating of a two-layer CH/CH–Br foil drives a
设计了一套无损检测光波沿人体经络传输特性的自动测量系统,测量808 nm光波沿人体经络及其周边非经络组织的漫射光强度,分析不同的激光输出功率对组织相对衰减率的影响.运用生物组织中光子传输理论的近似漫射法对实验结果进行分析,发现经络与周边非经络组织之间的光传输特性存在差异,这种差异性具有明显的医学统计意义(P
由于对波长直到X波段的微波信号的光传输方面的兴趣促使人们在把半导体激光的本征直接调制的带宽推向更高频率方面作了大量研究。
采用高温熔剂法合成了五种四磷酸稀土锂单晶LiLnP4O12(Ln=Ce,Pr,Eu,Ho,Er)。对它们的主要的物理性质和光谱性质作了较为系统的研究。对LiPrP4O12的吸收和荧光谱的研究表明,该晶体可能成为有希望的可见光区的激光材料。
To achieve the real-time detecting and localization of hypervelocity impact events, a monitoring and localization system was designed based on fiber Bragg grating (FBG) sensor network. First, the simulation model was built to study the damage evolution an