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A review of research on urban parking prediction

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Journal of Traffic and Transportation Engineering(English Edition) 2024年第4期11卷 700-720页

作者： Changxi ma Xiaoting Huang Jiangchen Li School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhou 730070China College of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The rapid growth of urban traffic has intensified daily congestion,affecting both traffic flow and *** parking prediction plays a vital role in effectively managing limited parking resources and is essential for the successful implementation of advanced intelligent *** an effort to comprehensively assess the latest developments in parking prediction,we curated a dataset of 639 articles spanning from 2010 to the present,using the Scopus ***,we performed a bibliometric analysis utilizing VOSviewer *** findings not only illuminate emerging trends within the parking prediction field but also provide strategic guidance for its ***,we categorized advancements in three focal areas:behavior prediction,demand prediction,and parking space prediction.A comprehensive overview of the present research status and future directions was then *** findings underscore the substantial progress achieved in current parking prediction models,achieved through diverse avenues like multi-source data integration,multi-variable feature extraction,nonlinear relationship modeling,deep learning techniques application,and ensemble model *** innovative endeavors have not only pushed the theoretical boundaries of parking prediction but also significantly heightened the precision and applicability of predictive models in practical *** research should explore avenues such as processing unstructured parking datasets,developing predictive models for small-scale data,mitigating noise interference in parking data,and harnessing potent platform fusion *** study's significance transcends guiding and catalyzing advancement in academic and practical domains;it holds paramount relevance across academic research,technological innovation,decision-making support,business applications,and policy formulation.

关键词： Parking prediction machine learning Smart parking Deep learning

A VNS-NPGA Approach to Multi-Objective Optimization of Hub-and-spoke Logistics Network

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Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Changxi ma Chuwei Shi yun yang yongpeng Zhao Zhuye Xu Bo Du School of Traffic and Transportation， Lanzhou Jiaotong University Key Laboratory of Railway lndustry on Plateau Railway Transportation Intelligent management and Control， Lanzhou Jiaotong University School of Tourism and management， yangling Vocational and Technical College School of New Energy and Power Engineering， Lanzhou Jiaotong University National Engineering Research Center of Highway maintenance Technology， Changsha University of Science & Technology SmaRT Infrastructure Facility， University of Wollongong

To realize low-cost freight transport in the logistics network and improve the network operation efficiency， a multi-objective optimization model and the corresponding algorithm for a hub-and-spoke logistics network are proposed based on the multi-level location of hub points and channels layout. By considering the structure of the multi-level hub-and-spoke logistics network and the features of the connectivity between the hub and spoke points， the multi-objective optimization model is constructed with two objectives of minimizing the total network operation costs and the total network service time. By considering the characteristics of decision variables and models， a Variable Neighborhood Search (VNS)-Niched Pareto Genetic Algorithm (NPGA) approach with a three-stage encoding structure chromosome is proposed， where the VNS algorithm nested in NPGA is used for individual variable neighborhood search to optimize individual channel level genes， and NPGA is adopted to solve the multi-objective optimization model. To evaluate the performance of the proposed VNS-NPGA approach， a real-life case study based on a small-scale Australia Post data set was conducted， and 25 nodes of the Australia Post and 14 nodes of the Gansu Province 3-level hub-and-spoke logistics networks were established， respectively. The analysis results indicated that the network structure of multi-level hub points could avoid the detour problem existing in the traditional hub-and-spoke network， and showed better applicability in the narrow geographical structure. Compared to the traditional multi-objective evolutionary algorithms， VNS-NPGA can obtain better solutions through the distributed optimization of channel levels， avoiding the problem that a single algorithm cannot effectively deal with coupling relationships in genes.

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Operation power consumption and verification tests of a trenching device for orchards in Xinjiang based on discrete element

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International Journal of Agricultural and Biological Engineering 2021年第1期14卷 133-141页

作者： Chen ma Jiangtao Qi za Kan Shaojie Chen Hewei Meng College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina College of Mechanical and Electronic Engineering Xinjiang Vocational UniversityUrumqi 830013China Key Laboratory of Northwest Agricultural machinery of the Ministry of Agriculture Shihezi 832000XinjiangChina Ruiyida.ma.hinery Equipment Co. Ltd.Shihezi Development ZoneShihezi 832000XinjiangChina

According to the agronomic requirements of orchard planting pattern and fertilization in Xinjiang,the soil particle models and a soil-trenching device interaction model were established by using discrete element simulation software in order to find out the law of influence of structure parameters and working parameters on the operation power consumption of a segmented cutting trenching device;moreover,its cutting process was simulated according to the response surface test *** to the results of research on the influence of forward speed,cutter disk speed and cutter disk combination on the operation power consumption of the segmented cutting trenching device,the law of their influence on the operation power consumption in descending order is forward speed,cutter disk combination,cutter disk *** to the response surface test result,the following influential factor parameter combination has been obtained:forward speed 815 m/h,cutter disk speed 112 r/min,cutter disk combination A(cut angle 150°,bent angle 60°and working width 133 mm),cutter disk combination B(cut angle 180°,bent angle 90°and working width 166 mm),and trenching operation power consumption-optimization results were verified through field *** to the verification,the results showed a high accuracy of the simulation,with a relative error mean of 3.18%between the theoretical value and the field test *** study can provide a reference for the energy-saving design of orchard trenching devices.

关键词： trenching device discrete element orchard power consumption simulation analysis parameter optimization

Design and parameter optimization of spiral-dragon type straw chopping test rig

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International Journal of Agricultural and Biological Engineering 2020年第1期13卷 47-56页

作者： Pengbo ma Liqiao Li Baoqin Wen yunheng Xue za Kan Jingbin Li College of Mechanical Electrical Engineering Shihezi UniversityShihezi 832000China Key Laboratory of Northwest Agricultural equipment Ministry of Agriculture and Rural AffairsShihezi 832000China

In order to address the problems of large chop length,high energy consumption and poor chopping effect that were associated with a horizontal total mixed rations(TMR)mixer,a straw chopping device was designed;further,its structure and working principle were *** this study,wheat straw was chosen as the test *** number of processing times,number of fixed blades,cutting speed,number of tooth plates and the inclined angle of the box were considered as the test *** standard straw length rate and average power were used as evaluation indices for conducting the orthogonal rotation combination experiment with five factors and five levels of quadratic *** experimental results denoted that the order of influencing factors on the standard straw length rate can be given as follows:the number of processing times,number of fixed blades,cutting speed,number of tooth plates and inclined angle of the *** order of the influence of each factor on the average power can be given as follows:the cutting speed,number of fixed blades and number of tooth ***,the optimum structural and working parameters of the device can be determined as follows:linear cutting speed of 17-20 m/min,box inclined angle of 70°-80°,20-23 fixed blades,5-6 processing times and 4-7 tooth *** such a circumstance,the standard straw length rate reached up to 70.5%-77.4%and the average power was low at 5.8-7 *** results can be used as reference for designing a chopping device for a TMR mixer.

关键词： total mixed rations straw chopping device parameter optimization

MICROSTRUCTURE ANALySIS AND MECHANICAL PROPERTIES OF Zn-Al ALLOy ROD PRODUCED By HEATED MOLD CONTINUOUS CASTING

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Acta Metallurgica Sinica(English Letters) 2003年第3期16卷 241-248页

作者： y.ma y.Hao F.y.yan H.J.Liu State Key Laboratory of Advanced Nonferrous materials Lanzhou University of Science & Technology Lanzhou 730050 ChinaState Key Laboratory of Advanced Nonferrous Materials Lanzhou University of Science & Technology Lanzhou 730050 ChinaState Key Laboratory of Advanced Nonferrous Materials Lanzhou University of Science & Technology Lanzhou 730050 ChinaSchool of Mechano-Electronic EngineeringHua Qian University Quanzhou 362011China

The new technology of continuous casting by heated mold was used to produce directional solidification za alloy lines to eliminate the inter defects of these lines and increase their mechanical properties. The results are as follows: (1) The microstruc-ture of the za alloy lines is the parallel directional dendritic columnar crystal. Every dendritic crystal of eutectic alloy za5 was composed of many layer eutectic β and η phases. The micro structure of hypereutectic za alloys is primary dendritic crystal and interdendritic eutectic structure. The primary phase of za8 and za12 is β, among them, but the primary phase of za22 and za27 is a. (2) Through the test to the as-cast za alloy lines made in continuous casting by heated mold, it is found that the tensile strength and hardness increase greatly, but the elongation decreases. With the increase of aluminum amount from za 5 to za 12, za22 and za27, the tensile strength increases gradually. za27 has the best comprehensive mechanical properties in these four kinds of za alloys. (3) Heat treatment can decrease the dendritic segregation and improve the elongation of za alloy, but make their strength decrease slightly.

关键词： zinc-aluminum alloy heated mold continuous casting mechanical properties heat treatment

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我国医患关系研究的进路与省思

医学与哲学 2024年第4期45卷 61-65页

作者：马萍陈姝冰兰州大学新闻与传播学院甘肃兰州730000

基于CiteSpace可视化分析工具,以“医患关系”为关键词,分析近年来传播学视域的医患关系研究议题与进程,发现医患关系研究出现从“媒介”到“人”的研究转向。其中以“媒介”为中心的医患关系视角注重医患关系的媒介呈现和媒介宣传,以... 详细信息

基于CiteSpace可视化分析工具,以“医患关系”为关键词,分析近年来传播学视域的医患关系研究议题与进程,发现医患关系研究出现从“媒介”到“人”的研究转向。其中以“媒介”为中心的医患关系视角注重医患关系的媒介呈现和媒介宣传,以“人”为中心的医患关系视角注重媒介使用与医患信任建构、媒介与患者健康意向行为关系及新型医患沟通模式分析。同时,探讨提升中国社会的医患关系研究路径,提出未来研究更应注重制度和文化等语境,跳出实证主义范式以及单一的“医−患”二元视角,以推动医患关系研究的均衡与系统化发展。

关键词：健康传播医患关系医患沟通

数字化赋能制造企业绿色转型升级——绿色创业导向与绿色创新的链式中介作用

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科技进步与对策 2024年第17期41卷 76-86页

作者：马亮高峻李娅宁兰州理工大学经济管理学院甘肃兰州730000

数字化推进制造企业绿色转型升级既是制造业高端化、智能化、绿色化的重要途径,也是建设制造强国和数字中国的重要保障。以2007—2021年中国制造业上市公司为样本,通过搭建以“绿色创业导向—绿色创新”为链条的中介效应模型,探究数字... 详细信息

数字化推进制造企业绿色转型升级既是制造业高端化、智能化、绿色化的重要途径,也是建设制造强国和数字中国的重要保障。以2007—2021年中国制造业上市公司为样本,通过搭建以“绿色创业导向—绿色创新”为链条的中介效应模型,探究数字化赋能对企业绿色转型升级的影响及多阶段作用路径。研究表明,数字化对于企业绿色转型升级具有显著赋能作用,且该作用存在“数字鸿沟”效应;绿色创业导向和绿色创新在数字化与企业绿色转型之间发挥中介作用,存在“数字化—绿色创业导向—绿色创新—绿色转型”的链式中介作用;数字化与环境规制协同促进企业绿色转型升级;数字化对绿色转型的促进作用在国有企业、高污染行业企业以及受“一带一路”倡议支持的企业中更加显著;数字化通过绿色转型升级提高企业绩效,兼具环境效益与经济效益。

关键词：数字化绿色转型绿色创业导向绿色创新

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马来人及其宗教

东南亚研究 2013年第5期 106-112页

作者：马强张梓轩 za'ba 陕西师范大学西北民族研究中心西安710062 不详

著名马来人学者扎巴在20世纪30年代对马来人习俗及宗教的讨论,涉及马来人信仰伊斯兰教的历史、马来人中的印度教和万物有灵论成分、伊斯兰现代思潮、宗教派别及其观点、马来人的现代主义观念等,是全面了解一个世纪前马来人信仰状况,特... 详细信息

著名马来人学者扎巴在20世纪30年代对马来人习俗及宗教的讨论,涉及马来人信仰伊斯兰教的历史、马来人中的印度教和万物有灵论成分、伊斯兰现代思潮、宗教派别及其观点、马来人的现代主义观念等,是全面了解一个世纪前马来人信仰状况,特别是当时出现的教派分裂及思想的重要资料。

关键词：扎巴马来人伊斯兰教派思潮

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用于红外和雷达波隐身的水泥基复合材料

材料导报 2024年第5期38卷 22-30页

作者：马超解帅王永超冀志江吴子豪王静中国建筑材料科学研究总院有限公司绿色建筑材料国家重点实验室北京100024

红外和雷达波隐身主要是通过降低目标的红外辐射信号和雷达回波信号来提高目标的隐蔽性。将相变材料与炭黑封装为相变单元,并将其与膨胀珍珠岩-磁粉/水泥复合材料结合,研制出一种兼具红外和雷达波隐身的双功能水泥基复合材料,对其吸波... 详细信息

红外和雷达波隐身主要是通过降低目标的红外辐射信号和雷达回波信号来提高目标的隐蔽性。将相变材料与炭黑封装为相变单元,并将其与膨胀珍珠岩-磁粉/水泥复合材料结合,研制出一种兼具红外和雷达波隐身的双功能水泥基复合材料,对其吸波性能和热性能进行试验与仿真研究。结果表明:炭黑对相变材料相变温度的影响较小,潜热仅降低了约1.9%;500次冷热循环后,相变材料的潜热留存率为78.3%,循环稳定性较好。相变单元和膨胀珍珠岩均可以提高水泥基复合材料的吸波能力,且反射损耗在-5~-15 dB可调。相变单元通过吸收大量热量来降低目标外表面温度,削弱红外辐射。相变材料的加入会增加水泥基复合材料的热导率,但相变材料高储热密度和珍珠岩低热导率的共同作用使得水泥基复合材料的隔热效应更加显著,从而降低目标的红外辐射信号。仿真结果表明:磁损耗仅出现在水泥基体中,相变单元通过电阻损耗来影响水泥基复合材料的吸波性能。热量传递在相变单元处受阻,传导热通量在相变单元边缘处的传输过程出现弯曲。当相变材料相变完成后,热量趋于均匀分布。因此,水泥基复合材料可通过损耗电磁波来降低雷达回波信号,通过相变材料吸收目标的热量来降低红外辐射,从而实现不同复杂环境下建筑材料的红外和雷达波等多波段隐身。

关键词：水泥基复合材料红外隐身雷达波隐身相变材料有限元法