The industrial application of an exterior three-layer anticorrosive polypropylene coating system(3PP)on large-diameter(larger than Φ600 mm)steel pipes was developed using an experimental process simulation study and ...The industrial application of an exterior three-layer anticorrosive polypropylene coating system(3PP)on large-diameter(larger than Φ600 mm)steel pipes was developed using an experimental process simulation study and the optimization of raw materials inspection,steel pipe surface pretreatments,and water cooling control on a coating application process.The coating properties meet ISO standard 21809 on buried or submerged 3PP pipelines used in the petroleum and natural gas industries.Differential scanning calorimetry and X-ray diffraction were used to analyze the crystallinities and grain sizes of polypropylene(PP)top coats with different cooling rates.Increasing the melt cooling rate reduces the crystallinity and grain size of the PP top coat and enhances its strength and toughness.展开更多
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
文摘目的检测PP1A与GSDME在结直肠癌组织中的表达与CD8^(+)T淋巴细胞丰度,探讨PP1A与GSDME介导焦亡的相关性和临床意义。方法应用GEPIA数据库分析PP1A与GSDME在结直肠癌组织与正常组织中mRNA的表达。采用Western blot法检测结直肠癌组织与对应癌旁正常黏膜中PP1A蛋白表达水平,运用免疫组化法检测107例结直肠癌与癌旁正常黏膜中PP1A、GSDME蛋白的表达和CD8^(+)T淋巴细胞丰度。利用Spearman等级相关性分析PP1A、GSDME和CD8^(+)T淋巴细胞丰度的相关性。结果GEPIA数据库检索显示,PP1A与GSDME的mRNA在结直肠癌组织和正常组织中的表达差异有统计学意义(P<0.05)。Western blot法检测结果显示,结直肠癌组织中PP1A相对表达量明显高于癌旁组织(0.937 vs 0.643,P<0.001)。免疫组化结果显示,结直肠癌组织中PP1A的表达明显高于正常黏膜,而GSDME的表达明显低于正常黏膜(P<0.05),GSDME表达与结直肠癌患者年龄、临床分期和错配修复蛋白密切相关(P<0.05);CD8^(+)T细胞在癌浸润前沿的分布明显高于癌旁正常黏膜,且CD8^(+)T细胞在癌组织中的分布与pT分期、临床分期及淋巴结转移相关。Spearman相关性分析显示,PP1A与GSDME表达呈负相关(r=-0.196,P<0.05)。PP1A阳性结直肠癌患者的总生存期低于PP1A阴性患者(P<0.05),患者预后与分化程度、淋巴结转移、pT分期和临床分期相关。PP1A表达、肿瘤分化程度、临床分期、pT分期和淋巴结转移均是影响结直肠癌患者预后的独立危险因素。结论PP1A在结直肠癌中高表达,与GSDME介导的细胞焦亡呈负相关,两者表达差异性与结直肠癌的发生、发展及预后均密切相关,可作为判断结直肠癌患者预后的潜在指标,CD8^(+)T细胞的差异性分布可能与GSDME介导的细胞焦亡及肿瘤的发展相关。
文摘The industrial application of an exterior three-layer anticorrosive polypropylene coating system(3PP)on large-diameter(larger than Φ600 mm)steel pipes was developed using an experimental process simulation study and the optimization of raw materials inspection,steel pipe surface pretreatments,and water cooling control on a coating application process.The coating properties meet ISO standard 21809 on buried or submerged 3PP pipelines used in the petroleum and natural gas industries.Differential scanning calorimetry and X-ray diffraction were used to analyze the crystallinities and grain sizes of polypropylene(PP)top coats with different cooling rates.Increasing the melt cooling rate reduces the crystallinity and grain size of the PP top coat and enhances its strength and toughness.
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。
