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在信息化和数字化时代，科技论文数量的迅速增加带来了一系列问题，如论文冗长、信息提取困难、阅读时间成本居高不下等，研究者面临着更加烦琐、耗时的文献阅读挑战。通过语言模型落地创新，设计了科技论文辅助阅读系统来应对这些挑战。以机器阅读理解技术为核心，通过解析论文文本和预先设定问题，达到自动回答的效果。充分利用预训练语言模型PERT，提升系统对语义的理解和信息的提取能力，解决科技论文阅读过程中存在的各种问题，从而帮助读者提高科技文献阅读效率。

行人重识别（person re-identification，re-ID）在多摄像机之间进行跨镜检索以匹配目标行人图像，可以在人脸、指纹等生物特征失效的情况下实现行人关联，已成为智能视频监控系统的关键技术，对智能安防、智慧城市等领域的产业落地进行了有效赋能。传统的行人重识别算法通常采用表征学习或度量学习方法。基于多任务学习的机器学习模式，结合表征学习与度量学习方法，综合利用特征表示和距离度量两方面的优势，采用分类损失和三元组损失共同训练模型，使模型在特征提取和相似性度量上都得到充分的训练。实验结果表明，该方法在行人重识别任务中取得了更好的性能，验证了鲁棒性和在泛化能力方面的优越性。

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[Objective] In order to study the total amount and speciation distribution characteristics of heavy metals in the soil of the main urban area of Chongqing. [Method] 64 surface soil samples were collected, and Tessier sequential extraction method was used to analyze the speciation of heavy metals, and potential ecological risk index method and risk assessment coding method (RAC) were used to evaluate the degree of ecological risk. [Result] The research results showed that the average value of heavy metals in this area exceeded the soil back-ground value of Chongqing, except for Ph and Cu. The speciation analysis showed that Hg, Ph, Cr, Cu, Zn and Ni were mainly in residual state, except for Cd, while the proportions of iron manganese oxide combined state (22 %), residual state (21 %) and exchangeable state (27 %) of heavy metal CD were very close. The results of correlation analysis showed that Cd had a strong positive correlation with Hg, Pb, Cr and Cu, while Ni had no significant correlation with other heavy metals. The potential ecological hazard index method showed that the ecological risk of these 7 heavy metals ranked as; Cd > Hg > Cr > Ni > Pb > Cu > Zn and Comprehensive Ecological Hazard Index RI indicated that the study area was at high ecological risk (317.408). RAC evaluation results indicated that the heavy metal Cd in the soil of the study area had reached a high ecological risk. [Conclusion] Based on the above analysis, it can be concluded that the soil in the main urban area of Chongqing is seriously polluted by Cd and the possible Hg and Cd compound pollution. The content and speciation characteristics of Cd and Hg in the surface soil should be monitored frequently, and the corresponding measures should be taken to manage and control. [ABSTRACT FROM AUTHOR]