Author Affiliations
Abstract
1 Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China
2 CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, iChEM, University of Science and Technology of China, Hefei 230026, China
A range-extended acidity detector based on Nile red was designed and analyzed in this work. In light of the good lasing property and solvatochromism characteristic of Nile red/ethanol solution, we have obtained laser spectra of sulfuric acid in different concentrations doped in this substrate. Moreover, to expand the acidity detection range, we proposed a tandem cuvette system containing rhodamine 6G/ethanol and Nile red/ethanol. Consequently, the detection range could be enlarged from 26 nm to 40 nm, by changing not only the wavelength peak but also by the intensity ratio of dual-wavelength laser output. In addition, by changing the detection and substrate materials, the whole detection range could be expanded, and therefore a wide range of applications in polarity and acidity detection could be implemented via this method.
acidity detector solvatochromism characteristic Nile red tandem cuvette system Chinese Optics Letters
2020, 18(11): 111402
1 海军航空工程学院青岛校区, 山东 青岛 266041
2 中国人民解放军92635部队, 山东 青岛 266041
研究了航空钛合金损伤结构梯度改性修复层和Ti600基体在800 ℃下的氧化行为; 采用恒温或循环氧化增重法、氧化速度常数、活度等理论计算研究了氧化的热力学和动力学规律; 利用扫描电镜(SEM)和X射线衍射(XRD)等分析了氧化膜形貌和组成。结果表明: 梯度修复层有较好的抗氧化性能, 其循环氧化动力学曲线基本符合抛物线规律; Ti600基体属次抗氧化级, 其循环氧化动力学曲线近似符合抛物线-直线规律; 梯度修复层氧化膜由金红石结构的TiO2和少量Cr2O3组成, 厚度5～6 μm, 与基体连接紧密, 且致密、连续, 为短纤维状组织; Ti600基体的氧化膜厚度达55 μm左右, 明显分为内氧化区、中致密层和外疏松多孔层, 为多面体规则形状组织。
激光技术 钛基梯度功能 高温氧化 laser Ti-based functionally gradient Ti600 Ti600 high temperature oxidation
1 国防科技大学 电子工程学院
2 信息中心,长沙 410073
3 国防科技大学 电子工程学院,长沙 410073
4 国防科技大学 信息中心,长沙 410073
图像分割和对象提取是从图像处理到图像分析的关键步骤。K-均值聚类算法和粒子群优化方法结合,即将K-均值方法的结果作为一个粒子并采用粒子群优化的方法,通过适应度函数,利用新的分类中心调整粒子位置,产生新的聚类中心。并将此方法应用于图像的分割。最后,将两种方法的处理结果进行了比较,结果表示基于PSO聚类方法对图像的分割效果比原算法有所改进。
粒子群优化 聚类算法 K-均值聚类 图像分割 桢式识别 图像处理 particle swarm optimization clustering method K-means clustering image segmentation pattern recognition image processing
