为了区分超光滑表面上方存在的微小粒子、亚表面缺陷、微粗糙度三种缺陷产生的散射光,并得到能够探测这三种缺陷的最佳区域,将双向反射分布函数(Bidirectional Reflection Distribution Function,BRDF)与琼斯矩阵结合,给出了三种缺陷在s...为了区分超光滑表面上方存在的微小粒子、亚表面缺陷、微粗糙度三种缺陷产生的散射光,并得到能够探测这三种缺陷的最佳区域,将双向反射分布函数(Bidirectional Reflection Distribution Function,BRDF)与琼斯矩阵结合,给出了三种缺陷在ss、sp、ps、pp四种偏振状态下的偏振系数。在此基础上,模拟和分析了三种缺陷在四种偏振状态下与散射方位角的关系。结果表明:利用p偏振入射光引起的p偏振散射光能将这几种缺陷区分开。根据三种缺陷与散射方位角变化关系的不同,给出了三种缺陷的最佳探测区域及实现方法。展开更多
In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new speci...In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new species of Coniopteris moguqiensis sp. nov. preserved as a fragment with fertile and sterile pinnules. The sterile ultimate pinnules are elongate ovate with sphenopteriod type venation, and fertile pinnules are usually isolated, bipinnate at least with the sorus apical, elliptical, 1 mm in diameter;sporangia are almost globular, 100-150 μm in diameter, and the annulus is vertical. In situ spores are rounded-triangular in polar view, 25-30 μm in diameter with sides straight and slightly convex;trilete, laesurae are thin and slightly straight;the exine surface is usually psilate under the light microscope but finely reticuloid sculptured on the proximal view under a scanning electronic microscope. The fern genus Coniopteris usually suggests a warm and humid environment, which is consistent with the palaeoclimatic conditions of petrified wood and megafossil plants. The new discovery further supplements the floral composition of the Wanbao Formation, providing new material for understanding the evolutionary trend and classification of Coniopteris.展开更多
文摘为了区分超光滑表面上方存在的微小粒子、亚表面缺陷、微粗糙度三种缺陷产生的散射光,并得到能够探测这三种缺陷的最佳区域,将双向反射分布函数(Bidirectional Reflection Distribution Function,BRDF)与琼斯矩阵结合,给出了三种缺陷在ss、sp、ps、pp四种偏振状态下的偏振系数。在此基础上,模拟和分析了三种缺陷在四种偏振状态下与散射方位角的关系。结果表明:利用p偏振入射光引起的p偏振散射光能将这几种缺陷区分开。根据三种缺陷与散射方位角变化关系的不同,给出了三种缺陷的最佳探测区域及实现方法。
基金financially supported by the Project of the NSFC, China (grant No.41602015, 41702032)the Geological Survey Programs of the China Geological Survey (grant No. DD20160048-4, No. DD20190039-06, 2017YFC060130501)+2 种基金the State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS) (grant No.183117)the Project “Establishment of Stratotypes of China—Improvements on Stratigraphic Chart of China” (grant No.2015FY310100)the Project “Divisions and Correlation of National Non-Marine Strata (K-Pg boundary) in China (grant No. 121201102000150010-04)
文摘In recent years, an increasing number of plant fossil leaves and petrified woods have been discovered from the Middle Jurassic Wanbao Formation in Moguqi Town of Inner Mongolia, NE China. Here, we describe a new species of Coniopteris moguqiensis sp. nov. preserved as a fragment with fertile and sterile pinnules. The sterile ultimate pinnules are elongate ovate with sphenopteriod type venation, and fertile pinnules are usually isolated, bipinnate at least with the sorus apical, elliptical, 1 mm in diameter;sporangia are almost globular, 100-150 μm in diameter, and the annulus is vertical. In situ spores are rounded-triangular in polar view, 25-30 μm in diameter with sides straight and slightly convex;trilete, laesurae are thin and slightly straight;the exine surface is usually psilate under the light microscope but finely reticuloid sculptured on the proximal view under a scanning electronic microscope. The fern genus Coniopteris usually suggests a warm and humid environment, which is consistent with the palaeoclimatic conditions of petrified wood and megafossil plants. The new discovery further supplements the floral composition of the Wanbao Formation, providing new material for understanding the evolutionary trend and classification of Coniopteris.
