墙体裂缝检测对于居民建筑的保养意义较大,传统人工检测难以适应当前快速精确的检测需求,由计算机进行识别的目标检测算法恰好能解决此问题。卷积神经网络是当下目标检测的主流核心网络,采用高效算法对目标图像的处理办法,使计算成本大...墙体裂缝检测对于居民建筑的保养意义较大,传统人工检测难以适应当前快速精确的检测需求,由计算机进行识别的目标检测算法恰好能解决此问题。卷积神经网络是当下目标检测的主流核心网络,采用高效算法对目标图像的处理办法,使计算成本大幅降低,被广泛运用于目标检测识别中。本文通过对深度学习的目标检测算法研究,选用YOLOv5模型,对常见的墙体裂缝进行识别。实验结果表明,YOLOv5算法模型能够有效识别数据集中包含的裂缝信息,精度达到0.845,召回率达到0.929,均值平均精度(mean Average Precision,mAP)达到了0.825。展开更多
The present thesis takes Joseph Conrad＇s best-known novel, Lord Jim as a text of analysis to explore its themes that are the ambiguous nature of good and evil, the importance and fragility of ideals, the isolation of...The present thesis takes Joseph Conrad＇s best-known novel, Lord Jim as a text of analysis to explore its themes that are the ambiguous nature of good and evil, the importance and fragility of ideals, the isolation of the individual, and the threat of disaster and failure that looms behind the calm surface of every day. It focuses on the psychological process of the protagonist, Jim, by employing Freud＇s psychoanalysis to solve the puzzle surrounding Jim.展开更多
目的:建立在线固相萃取液相色谱-串联质谱同时测定人血浆中奥氮平、舍曲林、利培酮以及阿立哌唑4种抗抑郁药含量的检测方法。方法:用乙腈沉淀蛋白提取目标化合物,HySphere C18在线固相净化柱净化,CAPCELL PAK C18色谱柱分离,串联质谱采...目的:建立在线固相萃取液相色谱-串联质谱同时测定人血浆中奥氮平、舍曲林、利培酮以及阿立哌唑4种抗抑郁药含量的检测方法。方法:用乙腈沉淀蛋白提取目标化合物,HySphere C18在线固相净化柱净化,CAPCELL PAK C18色谱柱分离,串联质谱采用电喷雾多反应监测正离子扫描模式进行检测,同位素内标法定量。结果:奥氮平、舍曲林、利培酮以及阿立哌唑4种抗抑郁药质量浓度在0.5~500 ng·mL^-1范围内线性关系良好,相关系数(r)均大于0.998,3个加样水平下的平均回收率为90.0%~97.3%,RSD(n=6)为2.1%~9.9%,准确度为92.0%~102.8%,4种药物在患者样品中的检测下限为2 ng·mL^-1。结论:该方法简单,准确度高,灵敏度好,可用于奥氮平、舍曲林、利培酮和阿立哌唑血药浓度的快速同时测定。展开更多
文摘墙体裂缝检测对于居民建筑的保养意义较大,传统人工检测难以适应当前快速精确的检测需求,由计算机进行识别的目标检测算法恰好能解决此问题。卷积神经网络是当下目标检测的主流核心网络,采用高效算法对目标图像的处理办法,使计算成本大幅降低,被广泛运用于目标检测识别中。本文通过对深度学习的目标检测算法研究,选用YOLOv5模型,对常见的墙体裂缝进行识别。实验结果表明,YOLOv5算法模型能够有效识别数据集中包含的裂缝信息,精度达到0.845,召回率达到0.929,均值平均精度(mean Average Precision,mAP)达到了0.825。
文摘The present thesis takes Joseph Conrad＇s best-known novel, Lord Jim as a text of analysis to explore its themes that are the ambiguous nature of good and evil, the importance and fragility of ideals, the isolation of the individual, and the threat of disaster and failure that looms behind the calm surface of every day. It focuses on the psychological process of the protagonist, Jim, by employing Freud＇s psychoanalysis to solve the puzzle surrounding Jim.
