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Multi-scale persistent spatiotemporal transformer for long-term urban traffic flow prediction

Journal of Electronic Science and Technology 2024年第1期22卷 53-69页

作者： Jia-Jun Zhong Yong Ma Xin-Zheng Niu Philippe Fournier-Viger Bing Wang zu-kuan Wei School of Computer Science and Engineering University of Electronic Science and Technology of ChinaChengdu611731China College of Computer Science&Software Engineering Shenzhen UniversityShenzhen518060China School of Computer Science Southwest Petroleum UniversityChengdu610500China

Long-term urban traffic flow prediction is an important task in the field of intelligent transportation,as it can help optimize traffic management and improve travel *** improve prediction accuracy,a crucial issue is how to model spatiotemporal dependency in urban traffic *** recent years,many studies have adopted spatiotemporal neural networks to extract key information from traffic ***,most models ignore the semantic spatial similarity between long-distance areas when mining spatial *** also ignore the impact of predicted time steps on the next unpredicted time step for making long-term ***,these models lack a comprehensive data embedding process to represent complex spatiotemporal *** paper proposes a multi-scale persistent spatiotemporal transformer(MSPSTT)model to perform accurate long-term traffic flow prediction in *** adopts an encoder-decoder structure and incorporates temporal,periodic,and spatial features to fully embed urban traffic data to address these *** model consists of a spatiotemporal encoder and a spatiotemporal decoder,which rely on temporal,geospatial,and semantic space multi-head attention modules to dynamically extract temporal,geospatial,and semantic *** spatiotemporal decoder combines the context information provided by the encoder,integrates the predicted time step information,and is iteratively updated to learn the correlation between different time steps in the broader time range to improve the model’s accuracy for long-term *** on four public transportation datasets demonstrate that MSPSTT outperforms the existing models by up to 9.5%on three common metrics.

关键词： Graph neural network Multi-head attention mechanism Spatio-temporal dependency Traffic flow prediction

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Influence of sea-land breeze on the formation and dissipation of severe dense fog and its burst reinforcement in the Yellow Sea coastal area,China

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Science China Earth Sciences 2024年第2期67卷 432-449页

作者： Ya GAO Duanyang LIU Shuqi YAN Wenjun ZHOU Hongbin WANG Fan zu Qin MEI Chuanxiang YI Ye SHENG Key Laboratory of Transportation Meteorology of China Meteorological Administration Nanjing210041China Yancheng Meteorological Bureau Yancheng224000China Nanjing Joint Institute for Atmospheric Sciences Nanjing210041China Key Laboratory of Disaster Weather Chinese Academy of Meteorological SciencesBeijing100086China

Based on the global reanalysis data of the National Centers for Environmental Prediction(NCEP)/National Center for Atmospheric Research,the surface meteorological observation data,sounding data and satellite observation data,this paper comprehensively analyzes the evolution process and formation mechanism of a persistent severe dense fog process occurred on February 15–17,2015 in Yancheng,eastern *** the numerical simulation experiment of Weather Research and Forecast(WRF)model,we further analyze the impact of sea-land breeze on the formation and burst reinforcement of *** show that the precipitation caused by the southwesterly airflow in front of the upper-level trough and the low-pressure inverted trough are conducive to the formation of early rain fog,while the nighttime clear radiance under the control of surface cold high and the infiltration of weak cold advection are conducive to the formation and development of later radiation-advection *** WRF model simulates the fog evolution process,which is basically consistent with the actual fog area,and the simulation results are credible to a certain *** simulation results show that the establishment of sea breeze has an advection cooling effect on the near surface layer,which is conducive to the formation and development of the inversion layer on the near surface,providing stable stratification conditions for the formation and burst reinforcement of *** one hand,the strengthening of sea breeze circulation can continuously transport water vapor to the study *** the other,the occurrence of ultra-low level jet is favorable for the accumulation of low-level water *** the same time,the inversion intensity further strengthens,which is in favor of the burst reinforcement and long-term maintenance of fog.

关键词： Radiation-advection fog Sea-land breeze Atmospheric boundary layer Fog burst reinforcement WRF model

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单层SiO_2和ZrO_2薄膜激光辐照损伤的对比

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压电与声光 2011年第1期33卷 115-118,122页

作者：章春来郭袁俊吕海兵袁晓东蒋晓东祖小涛中国工程物理研究院激光聚变研究中心四川绵阳621900 电子科技大学物理电子学院四川成都610054

分别采用物理气相沉积和溶胶-凝胶技术在K9基片上镀制了4块光学厚度相近的Si O2和ZrO2单层膜。分别采用椭偏仪、透射式光热透镜和原子力显微镜对两类薄膜的孔隙率、热吸收和微观表面形貌进行了表征;利用Nd∶YAG激光器测试了样品的激光... 详细信息

分别采用物理气相沉积和溶胶-凝胶技术在K9基片上镀制了4块光学厚度相近的Si O2和ZrO2单层膜。分别采用椭偏仪、透射式光热透镜和原子力显微镜对两类薄膜的孔隙率、热吸收和微观表面形貌进行了表征;利用Nd∶YAG激光器测试了样品的激光损伤阈值(LIDT;1 064 nm/8.1 ns),并用光学显微镜观察了两类薄膜的损伤形貌。结果表明,化学膜的孔隙率和表面粗糙度均大于相应的物理膜;对同一类薄膜而言,Si O2化学膜的孔隙率和表面粗糙度都比ZrO2化学膜大,物理膜则相反。化学膜有更小的热吸收,其损伤阈值普遍比物理膜高出1倍,其损伤形貌多为热熔型,而物理膜多为应力型。

关键词： SiO2/ZrO2薄膜孔隙率热吸收激光损伤阈值损伤形貌

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纳米结构及离子束改性对储氢材料性能的影响

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材料导报 2005年第3期19卷 21-24页

作者：吴继红王治国祖小涛张传飞雷家荣电子科技大学物理电子学院应用物理系成都610054 中国工程物理研究院核物理及化学研究所绵阳621900

氢能作为一种高能量密度、清洁的绿色新能源,已受到人们的极大重视。传统的储氢材料存在吸放氢动力学差和释氢温度高的缺点,不利于使用。综述了纳米结构和离子束技术对储氢合金性能的影响,指出纳米化以及离子束改性是改善储氢合金动力... 详细信息

氢能作为一种高能量密度、清洁的绿色新能源,已受到人们的极大重视。传统的储氢材料存在吸放氢动力学差和释氢温度高的缺点,不利于使用。综述了纳米结构和离子束技术对储氢合金性能的影响,指出纳米化以及离子束改性是改善储氢合金动力学特性和释氢温度的有效途径。

关键词：储氢材料储氢合金离子束释氢纳米结构性能动力学特性改性纳米化氢能

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1.7MeV电子辐照对TiNi形状记忆合金相变温度的影响

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核动力工程 2000年第6期21卷 546-549页

作者：祖小涛林理彬封向东霍永忠卢铁城王治国四川大学物理系辐射物理及技术教育部重点实验室 610064 四川大学金属材料系成都610041

用能量为 1.7MeV不同注量的电子辐照了 TiNi形状记忆合金，通过温度控制使辐照在合金的马氏体相进行，发现辐照使合金的马氏体逆相变开始温度 A s和结束温度 A f降低，且 A f对电子辐照更敏感，相变温度滞后宽度减小；马氏体相变开始温... 详细信息

用能量为 1.7MeV不同注量的电子辐照了 TiNi形状记忆合金，通过温度控制使辐照在合金的马氏体相进行，发现辐照使合金的马氏体逆相变开始温度 A s和结束温度 A f降低，且 A f对电子辐照更敏感，相变温度滞后宽度减小；马氏体相变开始温度 M s和结束温度 M f基本无变化。 XRD结果表明电子辐照造成了马氏体相点阵畸变，随辐照注量的增加有增大的趋势，并且较大注量的晶面间距都增大。说明辐照引入的点缺陷增加了马氏体弹性应变能使马氏体相稳定性降低，造成了马氏体逆相变温度的下降。

关键词：电子辐照形状记忆合金马氏体相变

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Proposing a machine learning approach to analyze and predict basic high-temperature properties of iron ore fines and its factors

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Journal of Iron and Steel Research International 2024年第5期31卷 1082-1094页

作者： Qing-ke Sun Yao-zu Wang Jian-liang Zhang Zheng-jian Liu Le-le Niu Chang-dong Shan Yun-fei Ma Institute of Artificial Intelligence University of Science and Technology BeijingBeijing100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing100083China

The basic high-temperature properties of iron ore play a crucial role in optimizing sintering and ore blending,but the testing process for these properties is complex and has significant lag time,which cannot meet the actual needs of ore blending.A prediction model for the basic high-temperature properties of iron ore fines was thus proposed based on a combination of machine learning algorithms and genetic ***,the prediction accuracy of different machine learning models for the basic high-temperature properties of iron ore fines was ***,a random forest model optimized by genetic algorithms was built,further improving the prediction accuracy of the *** test results show that the random forest model optimized by genetic algorithms has the highest prediction accuracy for the lowest assimilation temperature and liquid phase fluidity of iron ore,with a determination coefficient of 0.903 for the lowest assimilation temperature and 0.927 for the liquid phase fluidity after *** trained model meets the fluctuation requirements of on-site testing and has been successfully applied to actual production on site.

关键词： Iron ore Basic high-temperature property Machine learning Random forest Genetic algorithm

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Role of texture before rolling: a research based on texture and magnetic properties of 4.5 wt.% Si non-oriented electrical steel

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Journal of Iron and Steel Research International 2024年第8期31卷 1973-1986页

作者： Yu-fan Wang Guo-qing zu Shi-cheng Sun Ying Han Wei-wei Zhu Hui Wu Yu Zhao Xu Ran Key Laboratory of Advanced Structural Materials of Ministry of Education Changchun University of TechnologyChangchun 130012JilinChina CRRC Changchun Railway Vehicles Co. Ltd.Changchun 130000JilinChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongNSW 2522Australia

The evolution of microstructure,texture,and magnetic properties with random texture,near-copper texture,weak near-cube texture,and strong λ fiber(/ND(normal direction))before rolling of non-oriented electrical steel was *** recrystallized hot bands with different textures but similar grain sizes were prepared by pre-annealing at low-temperature and high-temperature normalization *** was observed that the final annealed products exhibited similar recrystallized *** contrast,the final annealed product with more 2 fiber before rolling exhibited a stronger cube *** the fiber before rolling becoming stronger,the proportion of(111)deformed matrices became larger,which could be observed in the early recrystallization *** overwhelmingly dominant 2 orientation nuclei are formed in the(111)deformed matrix and become the dominant ***,the best magnetic properties are obtained in the products with strong 2 fiber before rolling,corresponding to the strong cube texture and low anisotropyparameter.

关键词： Texture before rolling Non-oriented electrical steel-Nucleation Grain growth Magnetic property

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O_(2) adsorption on Fe_(3)O_(4) (110) surface and effect of gangue element Al doping: combined study of binding experiment and ab initio molecular dynamics

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Journal of Iron and Steel Research International 2024年第4期31卷 810-827页

作者： Zheng-jian Liu Hui-qing Jiang Yao-zu Wang Jian-liang Zhang Hong-mei Qiao An-yang Zheng Fang-yu Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Intelligence Science and Technology University of Science and Technology BeijingBeijing 100083China Beijing Shougang Co. Ltd.Qian'an 064404HebeiChina Department of Physics National University of Defense TechnologyChangsha 410128HunanChina

At high temperature,the chemical reaction mechanism at the interface of magnetite and the influence mechanism of gangue element Al on the oxidation performance of magnetite are not *** addition,due to the limitation of existing experimental equipment,it is difficult to clarify the interface reaction mechanism in the oxidation process and the influence mechanism of Al on the surface oxidation reaction of Fe_(3)O_(4) at an atomic scale at high *** surface oxidation reaction mechanism of magnetite and the influence mechanism of Al on the oxidation of magnetite were studied by experiments and AIMD(ab initio molecular dynamics).The experimental results show that the existence of Al_(2)O_(3) will reduce the initial oxidation temperature and comprehensive oxidation performance of *** AIMD results show that aluminum can accelerate the interface reaction rate of Fe_(3)O_(4) in the high-temperature oxidation atmosphere,but the strong Al-O binding ability is not conducive to the transfer of O atoms in the oxidation process.

关键词： Ironmaking Magnetite oxidation Interface reaction Adsorption-Gangue aluminum AIMD

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激光辐照效应的研究型物理实验探索

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实验科学与技术 2013年第5期11卷 226-229页

作者：徐世珍向霞刘艺祖小涛电子科技大学物理电子学院成都610054

介绍了激光辐照效应研究型物理实验的教学探索实践,利用CO2激光对石英玻璃元件表面进行辐照处理,实现对元件亚表面裂纹等缺陷的修复,另外对CO2激光辐照热效应过程进行了理论解释。该实验可作为高年级本科生的专业选修实验,以及课程设计... 详细信息

介绍了激光辐照效应研究型物理实验的教学探索实践,利用CO2激光对石英玻璃元件表面进行辐照处理,实现对元件亚表面裂纹等缺陷的修复,另外对CO2激光辐照热效应过程进行了理论解释。该实验可作为高年级本科生的专业选修实验,以及课程设计或毕业设计的研究型实验,对培养和锻炼学生的创新能力,发挥学生的主观能动性等都有重要的意义。

关键词：石英玻璃 CO2激光激光辐照效应研究型实验

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Identification of two compound heterozygous GNRHR mutations in two siblings with congenital hypogonadotropic hypogonadism

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Asian Journal of Andrology 2024年第1期26卷 120-122页

作者： Xiao-Bin Wang Ping Chen Xue-Er Yu zu-Liang Yao Ting-Chao Guo Bo-Chen Pan Center for Reproductive Medicine Department of Obstetrics and GynecologyShengjing Hospital of China Medical UniversityShenyang 110004China NuProbe Shanghai 200433China Urology Surgery of The Affiliated Reproductive Hospital of China Medical University and Liaoning Key Laboratory of Reproductive Health Liaoning Research Institute of Family Planning(The Affiliated Reproductive Hospital of China Medical University)Shenyang 110031China NHC Key Laboratory of Reproductive Health and Medical Genetics China Medical UniversityShenyang 110122China

DearEditor,Congenital hypogonadotropic hypogonadism(CHH)is a rare genetic disease characterized by gonadotropin-releasing hormone(GnRH)deficiency or insufficiency and normal hypothalamic-pituitary structures,resulting in defective sexual maturation or/and infertility.!CHH presents as a variety of nonreproductive phenotypes,such as renal hypoplasia,dental hypoplasia,or oculomotor abnormalities.

关键词： pogon compound ism

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