针对欠定盲源分离中混合矩阵估计精度不佳的问题,本文提出了一种结合带噪声的基于密度的空间聚类(combining density-based spatial clustering of application with noise,DBSCAN)和概率密度估计的混合矩阵估计算法。首先,通过向量转...针对欠定盲源分离中混合矩阵估计精度不佳的问题,本文提出了一种结合带噪声的基于密度的空间聚类(combining density-based spatial clustering of application with noise,DBSCAN)和概率密度估计的混合矩阵估计算法。首先,通过向量转换方式获得单声源时频点检测准则,并基于此准则从混合信号中检测出单声源点。其次,利用基于密度的空间聚类算法对单声源点进行聚类,由此估计出声源个数以及各类别所属的单声源点。再次,利用概率密度估计获得各类别的聚类中心,并构成混合矩阵。所提混合矩阵估计方法不需要提前设定声源个数,并且避免了由于数据分布不均所造成的聚类效果差的问题。最后,采用压缩感知技术实现源信号恢复,从而从混合信号中分离出各个声源信号。实验结果表明,本文所提的混合矩阵估计方法在声源个数未知的情况下,能够准确估计出混合矩阵;并且分离出的信号具有较高的质量。展开更多
传统文化与创新技术的联合是文化发展与推广的新趋势。京剧作为国粹,吸引当代民众的关注是京剧传承的重要工作之一。根据动态装置的特点与开源硬件平台的优势,设计了具有创意性和动态效果的微型京剧戏台。利用Arduino Mega 2560开发板...传统文化与创新技术的联合是文化发展与推广的新趋势。京剧作为国粹,吸引当代民众的关注是京剧传承的重要工作之一。根据动态装置的特点与开源硬件平台的优势,设计了具有创意性和动态效果的微型京剧戏台。利用Arduino Mega 2560开发板和相关资源,完成了微型戏台的功能实现,其有助于京剧文化的宣传与推广。展开更多
Baotou RE concentrate was decomposed with concentrated sulfuric acid by controlling the roasting temperature below 500℃.Thermogravimetry-differential thermal analysis(TG-DTA) and chemical analytical methods were us...Baotou RE concentrate was decomposed with concentrated sulfuric acid by controlling the roasting temperature below 500℃.Thermogravimetry-differential thermal analysis(TG-DTA) and chemical analytical methods were used to study the thermal decomposition process and the thermal decomposition effect.The Freeman-Carroll method was applied to analyze the TG-DTA curves.The activation energy, reaction order, and reaction frequency factor at different stages were calculated.The Satava method was used to deduce the reaction mechanism and the relative reaction rate during the thermal decomposition process.展开更多
文摘针对欠定盲源分离中混合矩阵估计精度不佳的问题,本文提出了一种结合带噪声的基于密度的空间聚类(combining density-based spatial clustering of application with noise,DBSCAN)和概率密度估计的混合矩阵估计算法。首先,通过向量转换方式获得单声源时频点检测准则,并基于此准则从混合信号中检测出单声源点。其次,利用基于密度的空间聚类算法对单声源点进行聚类,由此估计出声源个数以及各类别所属的单声源点。再次,利用概率密度估计获得各类别的聚类中心,并构成混合矩阵。所提混合矩阵估计方法不需要提前设定声源个数,并且避免了由于数据分布不均所造成的聚类效果差的问题。最后,采用压缩感知技术实现源信号恢复,从而从混合信号中分离出各个声源信号。实验结果表明,本文所提的混合矩阵估计方法在声源个数未知的情况下,能够准确估计出混合矩阵;并且分离出的信号具有较高的质量。
文摘传统文化与创新技术的联合是文化发展与推广的新趋势。京剧作为国粹,吸引当代民众的关注是京剧传承的重要工作之一。根据动态装置的特点与开源硬件平台的优势,设计了具有创意性和动态效果的微型京剧戏台。利用Arduino Mega 2560开发板和相关资源,完成了微型戏台的功能实现,其有助于京剧文化的宣传与推广。
基金supported by the National Natural Science Foundation of China (No. 20877008)the Program for New Century Excellent Telents in University of the Ministry of Education of China (No. 20407003)
文摘Baotou RE concentrate was decomposed with concentrated sulfuric acid by controlling the roasting temperature below 500℃.Thermogravimetry-differential thermal analysis(TG-DTA) and chemical analytical methods were used to study the thermal decomposition process and the thermal decomposition effect.The Freeman-Carroll method was applied to analyze the TG-DTA curves.The activation energy, reaction order, and reaction frequency factor at different stages were calculated.The Satava method was used to deduce the reaction mechanism and the relative reaction rate during the thermal decomposition process.