鉴于传感器采集的数据格式复杂、信息量大,不能有效地对传感器故障进行自动检测和隔离,从而影响评估的准确性,并产生错误预警信息,提出了一种基于几何后非线性独立元分析方法(Geometric Post Nonlinear ICA,gpICA)的传感器故障检测与隔...鉴于传感器采集的数据格式复杂、信息量大,不能有效地对传感器故障进行自动检测和隔离,从而影响评估的准确性,并产生错误预警信息,提出了一种基于几何后非线性独立元分析方法(Geometric Post Nonlinear ICA,gpICA)的传感器故障检测与隔离算法。该算法通过引入几何后非线性混合模型,将非线性数据线性化,再利用快速独立元分析(FastICA)对故障进行检测。通过计算监测数据对监控统计量的贡献度,基于贡献度分析法得以确定具体故障传感器,最终利用MATLAB软件进行数值模拟,实现了模拟故障传感器的检测和隔离。该算法相比传统的线性ICA故障检测具有更高的故障检测率,更适用于桥梁健康监测系统的故障检测与隔离。展开更多
Al-doped LiVPO4F cathode materials LiAlxV1-xPO4F were prepared by two-step reactions based on a car-bothermal reduction （CTR） process. The properties of the Al-doped LiVPO4F were investigated by X-ray diffraction （...Al-doped LiVPO4F cathode materials LiAlxV1-xPO4F were prepared by two-step reactions based on a car-bothermal reduction （CTR） process. The properties of the Al-doped LiVPO4F were investigated by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electrochemical measurements. XRD studies show that the Al-doped LiVPO4F has the same triclinic structure （space group p-↑1 ） as the undoped LiVPO4F. The SEM images exhibit that the particle size of Al-doped LiVPO4F is smaller than that of the undoped LiVPO4F and that the smallest particle size is only about 1 μm. The Al-doped LiVPO4F was evaluated as a cathode material for secondary lithium batteries,and exhibited an improved reversibility and cycleability,which may be attributed to the addition of Al^3＋ ion by stabilizing the triclinic structure.展开更多
The heat effect of the reaction between metallic aluminum and HCl(aq) solution of various concentrations were calorimetrically determined. Combining with the thermodynamic properties of related substances led to the ...The heat effect of the reaction between metallic aluminum and HCl(aq) solution of various concentrations were calorimetrically determined. Combining with the thermodynamic properties of related substances led to the thermodynamic properties of Al3+ (aq)展开更多
文摘鉴于传感器采集的数据格式复杂、信息量大,不能有效地对传感器故障进行自动检测和隔离,从而影响评估的准确性,并产生错误预警信息,提出了一种基于几何后非线性独立元分析方法(Geometric Post Nonlinear ICA,gpICA)的传感器故障检测与隔离算法。该算法通过引入几何后非线性混合模型,将非线性数据线性化,再利用快速独立元分析(FastICA)对故障进行检测。通过计算监测数据对监控统计量的贡献度,基于贡献度分析法得以确定具体故障传感器,最终利用MATLAB软件进行数值模拟,实现了模拟故障传感器的检测和隔离。该算法相比传统的线性ICA故障检测具有更高的故障检测率,更适用于桥梁健康监测系统的故障检测与隔离。
文摘Al-doped LiVPO4F cathode materials LiAlxV1-xPO4F were prepared by two-step reactions based on a car-bothermal reduction （CTR） process. The properties of the Al-doped LiVPO4F were investigated by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,and electrochemical measurements. XRD studies show that the Al-doped LiVPO4F has the same triclinic structure （space group p-↑1 ） as the undoped LiVPO4F. The SEM images exhibit that the particle size of Al-doped LiVPO4F is smaller than that of the undoped LiVPO4F and that the smallest particle size is only about 1 μm. The Al-doped LiVPO4F was evaluated as a cathode material for secondary lithium batteries,and exhibited an improved reversibility and cycleability,which may be attributed to the addition of Al^3＋ ion by stabilizing the triclinic structure.
文摘The heat effect of the reaction between metallic aluminum and HCl(aq) solution of various concentrations were calorimetrically determined. Combining with the thermodynamic properties of related substances led to the thermodynamic properties of Al3+ (aq)
