为解决因害虫尺度多样性导致其识别度相对较低的问题,本研究提出了一种基于PP-YOLO(PaddlePaddleYou Only Look once)的农业病虫害识别算法。选取2359个病虫害样本数据集,按照9∶1的比例进行训练集、测试集的划分;选择PP-YOLO模型进行...为解决因害虫尺度多样性导致其识别度相对较低的问题,本研究提出了一种基于PP-YOLO(PaddlePaddleYou Only Look once)的农业病虫害识别算法。选取2359个病虫害样本数据集,按照9∶1的比例进行训练集、测试集的划分;选择PP-YOLO模型进行病虫害监测,并利用平均精度mAP(mean average precision)指标进行模型精度评价;探讨PP-YOLO结合数据增强mixup、颜色扭曲法在病虫害中小目标检测上的适用性。结果表明,PP-YOLO模型在病虫害中小目标检测方面mAP达47.4%、26.5%;基于PP-YOLO模型结合数据增强mixup与颜色扭曲后在病虫害中小目标检测上mAP分别提升4.3%、2.9%。总之,PP-YOLO模型可有效检测识别农作物害虫,同时,数据增强mixup与颜色扭曲法可有效提升病虫害的数据样本指标。展开更多
采用1-甲基萘作为载体对分散染料上染改性聚苯硫醚(PPS)纤维进行了研究,探讨了染色温度、保温时间、载体用量对分散染料上染百分率的影响,对染色后改性PPS纤维色牢度进行了测试。结果表明,优化染色工艺条件为分散染料2%、载体0.3 m L/L...采用1-甲基萘作为载体对分散染料上染改性聚苯硫醚(PPS)纤维进行了研究,探讨了染色温度、保温时间、载体用量对分散染料上染百分率的影响,对染色后改性PPS纤维色牢度进行了测试。结果表明,优化染色工艺条件为分散染料2%、载体0.3 m L/L、染浴p H值为5、浴比1∶100、染色温度为135℃、保温时间40 min,此时分散大红S-BWFL上染百分率达到78.5%,分散黄棕S-2RFL上染百分率达到78.4%;染出后纤维的耐皂洗色牢度等级均达到4级及以上,耐摩擦色牢度均达到3~4级及以上。展开更多
High energy pp collision is dealt with by double-string model. Each string corresponds to one initial color dipole which will radiate gluons to form color dipole chain. Such gluon radiation process is described by col...High energy pp collision is dealt with by double-string model. Each string corresponds to one initial color dipole which will radiate gluons to form color dipole chain. Such gluon radiation process is described by color dipole model. According to the quark combination rule, the total multiplicity formulae for calculating primary meson and baryon of one dipole chain are presented- The calculated yields of various final hadrons in energy range =53- 1 800GeV agree well with available data.展开更多
文摘为解决因害虫尺度多样性导致其识别度相对较低的问题,本研究提出了一种基于PP-YOLO(PaddlePaddleYou Only Look once)的农业病虫害识别算法。选取2359个病虫害样本数据集,按照9∶1的比例进行训练集、测试集的划分;选择PP-YOLO模型进行病虫害监测,并利用平均精度mAP(mean average precision)指标进行模型精度评价;探讨PP-YOLO结合数据增强mixup、颜色扭曲法在病虫害中小目标检测上的适用性。结果表明,PP-YOLO模型在病虫害中小目标检测方面mAP达47.4%、26.5%;基于PP-YOLO模型结合数据增强mixup与颜色扭曲后在病虫害中小目标检测上mAP分别提升4.3%、2.9%。总之,PP-YOLO模型可有效检测识别农作物害虫,同时,数据增强mixup与颜色扭曲法可有效提升病虫害的数据样本指标。
文摘采用1-甲基萘作为载体对分散染料上染改性聚苯硫醚(PPS)纤维进行了研究,探讨了染色温度、保温时间、载体用量对分散染料上染百分率的影响,对染色后改性PPS纤维色牢度进行了测试。结果表明,优化染色工艺条件为分散染料2%、载体0.3 m L/L、染浴p H值为5、浴比1∶100、染色温度为135℃、保温时间40 min,此时分散大红S-BWFL上染百分率达到78.5%,分散黄棕S-2RFL上染百分率达到78.4%;染出后纤维的耐皂洗色牢度等级均达到4级及以上,耐摩擦色牢度均达到3~4级及以上。
基金the National Natural Science Foundation of China
文摘High energy pp collision is dealt with by double-string model. Each string corresponds to one initial color dipole which will radiate gluons to form color dipole chain. Such gluon radiation process is described by color dipole model. According to the quark combination rule, the total multiplicity formulae for calculating primary meson and baryon of one dipole chain are presented- The calculated yields of various final hadrons in energy range =53- 1 800GeV agree well with available data.
