Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from ...Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from the surrounding environment,along with its decay progeny,poses a substantive challenge in accurately determining the^(222)Rn concentration in the measurement outcomes.Among these,the protracted influence primarily stems from the two enduring decay progenies,namely^(212)Pb with a half-life of 10.64 h and^(212)Bi with a half-life of 60.54 min.This study explored the influence of^(220)Rn progeny on the measurement results of an AlphaGUARD PQ2000 radon monitor by developing a theoretical calculation model.The response coefficient related to the residual^(220)Rn progeny within the AlphaGUARD PQ2000 radon monitor was experimentally validated.In addition,this study investigated the effects of temperature and wind speed on the sensitivity of the instrument to^(220)Rn gas.The research findings revealed commendable agreement between the experimentally measured response coefficients of the residual^(220)Rn progeny and the corresponding values derived from the theoretical model.Notably,both the response coefficients of the AlphaGUARD PQ2000 radon monitor to^(220)Rn gas and its internal residual^(220)Rn progeny increased with elevated temperatures and increased wind speeds,providing a reference for correcting the impact of^(220)Rn and its progeny on the measurement results of^(222)Rn concentration obtained using the AlphaGUARD PQ2000 radon monitor.展开更多
当前,土地沙漠化已成为全球十大生态环境问题之一,严重威胁着众多国家和地区。为有效监测沙漠化动态,本研究基于Landsat遥感影像,通过辐射定标、大气校正等预处理算法获取沙漠区域影像。本研究首先采用人工目视解译方法对典型沙漠边界...当前,土地沙漠化已成为全球十大生态环境问题之一,严重威胁着众多国家和地区。为有效监测沙漠化动态,本研究基于Landsat遥感影像,通过辐射定标、大气校正等预处理算法获取沙漠区域影像。本研究首先采用人工目视解译方法对典型沙漠边界区域进行标注,构建训练样本;随后基于结构状态空间对偶的双分支编码沙漠分割模型提取大范围沙漠边界信息;最终形成2000–2020年每5年一次的中国沙漠边界数据集。本数据集涉及中国八大沙漠,即腾格里沙漠、塔克拉玛干沙漠、巴丹吉林沙漠、库布齐沙漠、乌兰布和沙漠、库姆塔格沙漠、古尔班通古特沙漠、柴达木盆地沙漠。在质量控制方面,通过引入Overall Accuracy(OA)、Mean Intersection over Union(MioU)、Mean Pixel Accuracy(MPA)、Mean Recall(MRecall)和Mean F1 Score(MF1)等指标进行精度评估,最终OA达98.78%,MIou达97.58%,MPA达98.77%,MRecall达98.77%,MF1达98.77%。本数据集在沙漠化监测、环境保护、资源管理等领域具有重要的应用价值,为沙漠化研究提供了有力的数据支撑。展开更多
基金supported by the National Natural Science Foundation of China(No.12175102)Hunan Provincial Natural Science Foundation(No.2022JJ40346)the 2022 Hunan Provincial University Student Innovation and Entrepreneurship Training Program(No.S202210555144).
文摘Owing to the inherent limitation of the internal pulse ionization chamber within the AlphaGUARD PQ2000 radon monitor,that is,its inability to discriminate the energy levels of α particles,the ingress of^(220)Rn from the surrounding environment,along with its decay progeny,poses a substantive challenge in accurately determining the^(222)Rn concentration in the measurement outcomes.Among these,the protracted influence primarily stems from the two enduring decay progenies,namely^(212)Pb with a half-life of 10.64 h and^(212)Bi with a half-life of 60.54 min.This study explored the influence of^(220)Rn progeny on the measurement results of an AlphaGUARD PQ2000 radon monitor by developing a theoretical calculation model.The response coefficient related to the residual^(220)Rn progeny within the AlphaGUARD PQ2000 radon monitor was experimentally validated.In addition,this study investigated the effects of temperature and wind speed on the sensitivity of the instrument to^(220)Rn gas.The research findings revealed commendable agreement between the experimentally measured response coefficients of the residual^(220)Rn progeny and the corresponding values derived from the theoretical model.Notably,both the response coefficients of the AlphaGUARD PQ2000 radon monitor to^(220)Rn gas and its internal residual^(220)Rn progeny increased with elevated temperatures and increased wind speeds,providing a reference for correcting the impact of^(220)Rn and its progeny on the measurement results of^(222)Rn concentration obtained using the AlphaGUARD PQ2000 radon monitor.
文摘当前,土地沙漠化已成为全球十大生态环境问题之一,严重威胁着众多国家和地区。为有效监测沙漠化动态,本研究基于Landsat遥感影像,通过辐射定标、大气校正等预处理算法获取沙漠区域影像。本研究首先采用人工目视解译方法对典型沙漠边界区域进行标注,构建训练样本;随后基于结构状态空间对偶的双分支编码沙漠分割模型提取大范围沙漠边界信息;最终形成2000–2020年每5年一次的中国沙漠边界数据集。本数据集涉及中国八大沙漠,即腾格里沙漠、塔克拉玛干沙漠、巴丹吉林沙漠、库布齐沙漠、乌兰布和沙漠、库姆塔格沙漠、古尔班通古特沙漠、柴达木盆地沙漠。在质量控制方面,通过引入Overall Accuracy(OA)、Mean Intersection over Union(MioU)、Mean Pixel Accuracy(MPA)、Mean Recall(MRecall)和Mean F1 Score(MF1)等指标进行精度评估,最终OA达98.78%,MIou达97.58%,MPA达98.77%,MRecall达98.77%,MF1达98.77%。本数据集在沙漠化监测、环境保护、资源管理等领域具有重要的应用价值,为沙漠化研究提供了有力的数据支撑。
