In order to discuss the relationship among the wild herbaceous peonies native in China according to microscopic characteristics, the pollen grains of four wild herbaceous peonies were examined under scanning electron ...In order to discuss the relationship among the wild herbaceous peonies native in China according to microscopic characteristics, the pollen grains of four wild herbaceous peonies were examined under scanning electron microscope (SEM), and the data acquired were used in clustering analysis. The result with SEM showed distinctly distinguishing extine surface pattern of taxonomic importance among the four species: reticulate pattern for Paeonia lactiflora; micro-foveolate, regulate and regulate-foveolate pattern for P. veitchii ; regulate and subcerebro-reticulate pattern for P. obovata ; regulate pattern for P. anomala var. intermedia . The result with clustering analysis suggested the close relationship between P. veitchii and P. anomala var. intermedia for their Euclidean distance was only 2.51, and the alienation between P. lactiflora and the other three species for their Euclidean distances were all more than 5.00. In addition, we deduced P. obovata may be the linkage between subsect Foliolatae and subsect Dissectifoliae for its pollen morphology was appreciably inclined to P. veitchii and P. anomala var. intermedia.展开更多
In this paper, a novel signal processing method combining mathematical morphology (MM) and Walsh theory is proposed, which uses Walsh functions to control the structuring element (SE) and MM operators. Based on the Wa...In this paper, a novel signal processing method combining mathematical morphology (MM) and Walsh theory is proposed, which uses Walsh functions to control the structuring element (SE) and MM operators. Based on the Walsh-MM method, a scheme for power quality disturbances detection and classification is developed, which involves three steps: denoising, feature extraction and morphological clustering. First, various evolution rules of Walsh function are used to generate groups of SEs for the multiscale Walsh-ordered morphological operation, so the original signal can be denoised. Next, the fundamental wave of the denoised signal is suppressed by Hadamard matrix;thus, disturbances can be extracted. Finally, the Walsh power spectrum of the waveform extracted in the previous step is calculated, and the parameters of which are taken by morphological clustering to classify the disturbances. Simulation results reveal the proposed scheme can effectively detect and classify disturbances, and the Walsh-MM method is less affected by noise and only involves simple calculation, which has a potential to be implemented in hardware and more suitable for real-time application.展开更多
为探测土壤表面干缩裂隙的发育情况,该研究以农田土壤表面干缩裂隙作为研究对象,以高密度电阻率法为测量手段,采用耦合层次聚类分析的同步连续线性估计算法(Simultaneous successive linear estimation,Sim SLE)反演土壤表面干缩裂隙的...为探测土壤表面干缩裂隙的发育情况,该研究以农田土壤表面干缩裂隙作为研究对象,以高密度电阻率法为测量手段,采用耦合层次聚类分析的同步连续线性估计算法(Simultaneous successive linear estimation,Sim SLE)反演土壤表面干缩裂隙的形态,结合试验裂隙图像和反演得到的模拟图像,对比分析裂隙形态的成像结果。研究表明:基于SimSLE算法反演得到的模拟裂隙图像,可以准确捕捉到裂隙的形状和位置,试验与模拟图像的面积、长度及欧拉数密度一致性指标均大于0.9,决定系数R^(2)都大于0.6,均方根误差数值较小。引入了层次聚类分析后,通过不断更新分区均值和边界,能够更准确地得到农田土壤干缩裂隙的形态特征,分区后模拟结果较好。引入聚类分区后Minkowski密度的决定系数R^(2)提高了9.76%~18.5%,一致性指标提高了0.93%~1.47%,均方根误差降低了12.1%~21.1%,有效提高了模拟精度。研究可为探究非侵入性探测裂隙的形态特征提供算法参考。展开更多
文摘In order to discuss the relationship among the wild herbaceous peonies native in China according to microscopic characteristics, the pollen grains of four wild herbaceous peonies were examined under scanning electron microscope (SEM), and the data acquired were used in clustering analysis. The result with SEM showed distinctly distinguishing extine surface pattern of taxonomic importance among the four species: reticulate pattern for Paeonia lactiflora; micro-foveolate, regulate and regulate-foveolate pattern for P. veitchii ; regulate and subcerebro-reticulate pattern for P. obovata ; regulate pattern for P. anomala var. intermedia . The result with clustering analysis suggested the close relationship between P. veitchii and P. anomala var. intermedia for their Euclidean distance was only 2.51, and the alienation between P. lactiflora and the other three species for their Euclidean distances were all more than 5.00. In addition, we deduced P. obovata may be the linkage between subsect Foliolatae and subsect Dissectifoliae for its pollen morphology was appreciably inclined to P. veitchii and P. anomala var. intermedia.
基金supported by the National Natural Science Foundation of China(52077081)。
文摘In this paper, a novel signal processing method combining mathematical morphology (MM) and Walsh theory is proposed, which uses Walsh functions to control the structuring element (SE) and MM operators. Based on the Walsh-MM method, a scheme for power quality disturbances detection and classification is developed, which involves three steps: denoising, feature extraction and morphological clustering. First, various evolution rules of Walsh function are used to generate groups of SEs for the multiscale Walsh-ordered morphological operation, so the original signal can be denoised. Next, the fundamental wave of the denoised signal is suppressed by Hadamard matrix;thus, disturbances can be extracted. Finally, the Walsh power spectrum of the waveform extracted in the previous step is calculated, and the parameters of which are taken by morphological clustering to classify the disturbances. Simulation results reveal the proposed scheme can effectively detect and classify disturbances, and the Walsh-MM method is less affected by noise and only involves simple calculation, which has a potential to be implemented in hardware and more suitable for real-time application.
文摘为探测土壤表面干缩裂隙的发育情况,该研究以农田土壤表面干缩裂隙作为研究对象,以高密度电阻率法为测量手段,采用耦合层次聚类分析的同步连续线性估计算法(Simultaneous successive linear estimation,Sim SLE)反演土壤表面干缩裂隙的形态,结合试验裂隙图像和反演得到的模拟图像,对比分析裂隙形态的成像结果。研究表明:基于SimSLE算法反演得到的模拟裂隙图像,可以准确捕捉到裂隙的形状和位置,试验与模拟图像的面积、长度及欧拉数密度一致性指标均大于0.9,决定系数R^(2)都大于0.6,均方根误差数值较小。引入了层次聚类分析后,通过不断更新分区均值和边界,能够更准确地得到农田土壤干缩裂隙的形态特征,分区后模拟结果较好。引入聚类分区后Minkowski密度的决定系数R^(2)提高了9.76%~18.5%,一致性指标提高了0.93%~1.47%,均方根误差降低了12.1%~21.1%,有效提高了模拟精度。研究可为探究非侵入性探测裂隙的形态特征提供算法参考。
