Tomographic gamma scanner(TGS),an advancedγ-ray nondestructive analysis technique,can locate and analyze nuclides in radioactive nuclear waste,and TGS can be categorized into two processes:e.g.,transmission measureme...Tomographic gamma scanner(TGS),an advancedγ-ray nondestructive analysis technique,can locate and analyze nuclides in radioactive nuclear waste,and TGS can be categorized into two processes:e.g.,transmission measurement and emission measurement.Specifically,transmission measurements provide the basis for accurate measurement of nonuniform radionuclide content in TGS scanning.The scan data were obtained using the Monte Carlo tool Geant4 simulation,and 25 voxels were divided into five lengths and five widths in a square barrel.In this study,an encoding cropping algorithm based on draped foot vector judgment was adopted to rapidly calculate the voxel trace matrix within a square bucket of nuclear waste,and the transmission images were reconstructed using ordered subset expectation maximization.The results indicated that the cropping speed of the improved coding algorithm was significantly higher than that of the original algorithm,and the relative mean deviation and root-mean-square error between the reconstructed attenuation coefficient and the reference standard value tended to decrease with an increase in the cropped line segments in the voxel;the Pearson correlation coefficient tended to converge to 1.0.The image quality evaluation parameters of the high media-density materials were better than those of the low media-density materials in the above three indexes.The reconstruction effect was relatively poor for more complex filling materials.When there were more than 10 cropped line segments in the voxel,the reconstruction data generally tended to be stable.The graphical trimming algorithm can rapidly calculate the trace matrix of the scanned voxels;it exhibits the advantages of speed and efficiency and can serve as a novel method to solve the trace matrix of TGS nuclear waste transmission scans.展开更多
气源定位的机器人已在有毒气体、火灾征兆、爆炸物探测等应用中广泛使用。为此,设计了基于模糊逻辑的小型气源定位移动机器人。该机器人以Arduino Mega 2560作为嵌入式控制器,并以TGS 2600芯片作为气体传感器。将气体传感器所感测的气...气源定位的机器人已在有毒气体、火灾征兆、爆炸物探测等应用中广泛使用。为此,设计了基于模糊逻辑的小型气源定位移动机器人。该机器人以Arduino Mega 2560作为嵌入式控制器,并以TGS 2600芯片作为气体传感器。将气体传感器所感测的气体浓度作为模糊逻辑的输入,而用模糊逻辑的输出决定机器人驱动电动机的PWM信号。机器人跟踪的路径取决于机器人左、右电动机的PWM信号。当机器人右边气味浓度高于中间和左边时,模糊逻辑就决定让机器人向右移动。在这种条件下,左边电动机的移动速度高于右边电动机速度,致使机器人就向右移动。实验数据表明,设计的小型机器人具备在室内自主定位气源的能力。展开更多
基金supported by the National Natural Science Foundation of China(No.U19A2086)the fund of Science and Technology Bureau of LeShan City(No.22ZDYJ0015).
文摘Tomographic gamma scanner(TGS),an advancedγ-ray nondestructive analysis technique,can locate and analyze nuclides in radioactive nuclear waste,and TGS can be categorized into two processes:e.g.,transmission measurement and emission measurement.Specifically,transmission measurements provide the basis for accurate measurement of nonuniform radionuclide content in TGS scanning.The scan data were obtained using the Monte Carlo tool Geant4 simulation,and 25 voxels were divided into five lengths and five widths in a square barrel.In this study,an encoding cropping algorithm based on draped foot vector judgment was adopted to rapidly calculate the voxel trace matrix within a square bucket of nuclear waste,and the transmission images were reconstructed using ordered subset expectation maximization.The results indicated that the cropping speed of the improved coding algorithm was significantly higher than that of the original algorithm,and the relative mean deviation and root-mean-square error between the reconstructed attenuation coefficient and the reference standard value tended to decrease with an increase in the cropped line segments in the voxel;the Pearson correlation coefficient tended to converge to 1.0.The image quality evaluation parameters of the high media-density materials were better than those of the low media-density materials in the above three indexes.The reconstruction effect was relatively poor for more complex filling materials.When there were more than 10 cropped line segments in the voxel,the reconstruction data generally tended to be stable.The graphical trimming algorithm can rapidly calculate the trace matrix of the scanned voxels;it exhibits the advantages of speed and efficiency and can serve as a novel method to solve the trace matrix of TGS nuclear waste transmission scans.
文摘气源定位的机器人已在有毒气体、火灾征兆、爆炸物探测等应用中广泛使用。为此,设计了基于模糊逻辑的小型气源定位移动机器人。该机器人以Arduino Mega 2560作为嵌入式控制器,并以TGS 2600芯片作为气体传感器。将气体传感器所感测的气体浓度作为模糊逻辑的输入,而用模糊逻辑的输出决定机器人驱动电动机的PWM信号。机器人跟踪的路径取决于机器人左、右电动机的PWM信号。当机器人右边气味浓度高于中间和左边时,模糊逻辑就决定让机器人向右移动。在这种条件下,左边电动机的移动速度高于右边电动机速度,致使机器人就向右移动。实验数据表明,设计的小型机器人具备在室内自主定位气源的能力。
