The service performance of the turbine blade root of an aero-engine depends on the microstructures in its superficial layer. This work investigated the surface deformation structures of turbine blade root of single crystal nickel-based superalloy produced under different creep feed grinding conditions. Gradient microstructures in the superficial layer were clarified and composed of a severely deformed layer (DFL) with nano-sized grains (48–67 nm) at the topmost surface, a DFL with submicron-sized grains (66–158 nm) and micron-sized laminated structures at the subsurface, and a dislocation accumulated layer extending to the bulk material. The formation of such gradient microstructures was found to be related to the graded variations in the plastic strain and strain rate induced in the creep feed grinding process, which were as high as 6.67 and 8.17 × 107 s.1, respectively. In the current study, the evolution of surface gradient microstructures was essentially a transition process from a coarse single crystal to nano-sized grains and, simultaneously, from one orientation of a single crystal to random orientations of polycrystals, during which the dislocation slips dominated the creep feed grinding induced microstructure deformation of single crystal nickel-based superalloy.

压缩感知近年来在目标跟踪领域得到了广泛应用，它对海量特征压缩降维，在贝叶斯分类器模型下能取得很好的分类效果，处理速度快，具有实时性。但尺寸固定不变的跟踪窗口不能有效跟踪存在明显尺度变化的目标。本文采用多尺度和级联分类器机制，选取最佳尺度下的窗口作为最终目标。实验结果表明，本算法不仅在目标形态变化、光线变化、多目标干扰、运动模糊等复杂场景下有较好跟踪效果，在目标尺度变化时也有较强鲁棒性。

测量柴油样品的太赫兹时域光谱并对其含硫量进行了定量计算.在0.2~1.5 THz范围内，柴油的吸收系数随着太赫兹频率和硫含量呈规律性递增.基于这一变化关系建立起了硫含量与太赫兹吸收系数和频率的多元非线性模型，通过测量柴油的太赫兹光谱代入此模型即可计算出柴油的硫含量.这一结果为太赫兹时域光谱技术应用于柴油含硫量的无损快速检测奠定了理论基础，显示出巨大的应用前景.

太赫兹时域光谱技术可以分辨化合物结构上的微小差异并应用于物质检测与分析，为有机化工产品的鉴别及更宽有效光谱区的测试提供了新的实验方法.本文运用太赫兹时域光谱技术研究了甲醇、防冻液和刹车油在太赫兹波段的光学特性，在室温氮气环境中,得到了样品的时域谱和在0.2~2.5 THz波段的吸收谱.甲醇和防冻液、刹车油在此波段的吸收谱存在显著差异，甲醇的吸收峰位于0.35 THz、0.72 THz处，防冻液和刹车油的主要吸收峰位于0.62 THz处.实验表明，用太赫兹时域光谱技术可以检测防冻液和刹车油里是否掺有甲醇，进而判断其质量的优劣.