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Guidance Control for Parallel Parking Tasks

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 301-306页

作者： jiyuan Tan Chunling xu Li Li Fei-Yue Wang Dongpu Cao Lingxi Li Key Laboratory of Urban Intelligent Traffic Control Technology North China University of TechnologyBeijing 100144China Beijing Transport Institute Beijing 100073China Department of Automation BNRistTsinghua UniversityBeijing 100084China Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of SciencesBeijing 100080China Driver Cognition and Automated Driving Laboratory University of WaterlooWaterloo N2L 3G1Canada Department of Electrical and Computer Engineering Purdue School of Engineering and TechnologyIndiana University-Purdue University IndianapolisIndiana 46202-5132 USA

Parking into small berths remains difficult for unskilled drivers. Researchers had proposed different automatic parking systems to solve this problem. The first kind of strategies(called parking trajectory planning) designs a detailed reference trajectory that links the start and ending points of a special parking task and let the vehicle track this reference trajectory so as to park into the berth. The second kind of strategies(called guidance control) just characterizes several regimes of driving actions as well as the important switching points in certain rule style and let the vehicle follows the pre-selected series of actions so as to park into the berth. Parking guidance control is simpler than parking trajectory planning. However, no studies thoroughly validated parking guidance control before. In this paper, a new automatic parking method is presented, which could characterize the desired control actions directly. Then the feasibility is examined carefully. Tests show that a simple parking guidance control strategy can work in most parallel parking tasks, if the available parking berth is not too small. This finding helps to build more concise automatic parking systems that can efficiently guide human drivers.

关键词： Automatic parking guidance control trajectory planning

Zircon U-Pb Ages and Tectonic Implications of Late Paleozoic Volcanic Rocks in the Western Tianshan,North Xinjiang,China

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Journal of Earth Science 2022年第3期33卷 736-752页

作者： Zaili Tao jiyuan Yin Wen Chen Yuelong Chen Jingbo Sun Zhihua xu School of Earth Sciences and Resources China University of GeosciencesBeijing 100083China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China Limited Liability Company TBEA DUSHANBE Mining IndustryChangji 831100China

The Late Paleozoic volcanic rocks are widespread in the Western Tianshan,and mainly consist of basalt,trachyte,trachy-andesite,andesite and ***,the formation timing and tectonic implications of the volcanic rocks remain *** obtain a comprehensive dataset with adequate spatial coverage,we collected the published zircon U-Pb age data of the Late Paleozoic volcanic rocks in the Western Tianshan,and mapped the temporal and spatial distribution of these volcanic *** compiled dataset indicates that the volcanic rocks in the Western Tianshan were formed in two major stages:Late Silurian-Early Carboniferous and Late Carboniferous-Middle *** southward subduction of the Northern Tianshan Ocean formed a large number of Late Silurian-Early Carboniferous volcanic *** flare-up of Late Carboniferous to Middle Permian magmatism in the NTOB was considered to be the response of the slab-roll back of the northern Tianshan ***,arc magma assemblage and spatial-temporal distribution are of great significance to identify the dynamic mechanism transformation of subduction zone.

关键词： volcanic rocks zircon Western Tianshan tectonic transformation slab-roll back

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某市豆芽中4-氯苯氧乙酸钠的风险分析

食品安全导刊 2023年第2期 58-60页

作者：金晓君许计元廉志顺雷祎婷付硕安徽创佳安全环境科技有限公司安徽宿州234000

目的:了解某市豆芽中4-氯苯氧乙酸钠的添加情况,对其违规添加进行风险分析。方法:随机从多个区/县市场抽取样品120份,采用液相色谱串联质谱法进行定性定量分析。结果:在120份抽检样品中,4-氯苯氧乙酸钠共检出20份,检出率16.7%,黄豆芽的... 详细信息

目的:了解某市豆芽中4-氯苯氧乙酸钠的添加情况,对其违规添加进行风险分析。方法:随机从多个区/县市场抽取样品120份,采用液相色谱串联质谱法进行定性定量分析。结果:在120份抽检样品中,4-氯苯氧乙酸钠共检出20份,检出率16.7%,黄豆芽的检出率高于绿豆芽(P<0.05),区域检出率差别显著(P<0.05)。结论:该市的抽检不合格率高于文献平均水平,需继续加大对豆芽的监管力度。

关键词：豆芽 4-氯苯氧乙酸钠风险分析

Acupuncture on intrauterine growth restriction associated brain injury:case study including use of magnetic resonance imaging

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Journal of Traditional Chinese Medicine 2023年第3期43卷 602-605页

作者： XIN Zhixiong LI jiyuan xu Yanni LING Jing JIANG Min YU Yutian Department of Pediatrics People's Hospital of Sanshui DistrictFoshan 528000China Department of MRI Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China Ninth School of Clinical Medicine Peking UniversityBeijing 100038China Foshan Minfound Medical Imaging Diagnostic Center Foshan 528000China Department of Gynecology Shenzhen Traditional Chinese Medicine HospitalShenzhen 518033China Acupuncture Department Beijing Shijitan HospitalCapital Medical UniversityBeijing 100038China

Brain injury due to intrauterine growth restriction(IUGR) is a thorny clinical problem that often leads to permanent neurological deficits such as cerebral *** practical therapies can treat an IUGR-associated brain *** employed acupuncture to treat a 6-month-old male patient with severe hypoxic-ischemic encephalopathy(HIE) due to IUGR,as confirmed by magnetic resonance imaging(MRI).Three courses of acupuncture treatment significantly improved some of the patient’s clinical characteristics,such as his insensitive responsiveness and motor deficits,with remarkably reversed HIE features on MRI at 1-year of *** case suggests that acupuncture is a potential treatment option for an IUGRassociated brain injury and warrants further investigation.

关键词： acupuncture fetal growth retardation brain injuries hypoxia-ischemia brain magnetic resonance imaging neuronal plasticity

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双层挤出技术在静脉留置针连接管上的应用

河南科技 2020年第2期39卷 59-61页

作者：刘珍程玲玲莫盼盼牛凯波张少帅徐继元河南驼人医疗器械研究院有限公司河南长垣453400 河南省医用高分子材料技术与应用重点实验室河南长垣453400

本文使用1种PVC材料和4种TPU材料对静脉留置针连接管进行双层复合挤出,对挤出产品进行手挤压、剥离力和耐酸碱试验。结果表明,PVC 8408分别与TPU 1085A、TPU 8963-82A复合挤出的留置针连接管内外层材料结合度较好。

关键词：双层复合挤出留置针连接管材料结合度

Promoting di-isobutene selectivity over ZnO/ZrO_(2)-SO_(4) in isobutene oligomerization

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Chinese Journal of Chemical Engineering 2021年第10期34卷 165-171页

作者： jiyuan Li Mifen Cui Zhuxiu Zhang Xian Chen Qing Liu Zhaoyang Fei Jihai Tang xu Qiao State Key Laboratory of Materials-Oriented Chemical Engineering College of Chemical EngineeringNanjing Tech UniversityNanjing 210009China Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM) Nanjing 210009China

Isooctane attracts great interest in recent years because of its promising potential as friendlyenvironmental gasoline,which is obtained by dimerization of isobutene with a hydrogenation ***,a solid acid catalyst sulfated zirconia modified by ZnO was *** oligomerization of isobutene had been investigated over ZrO_(2)-SO_(4) and ZnO(X)/ZrO_(2)-SO_(4) catalyst in order to find efficient catalysts for the production of isobutene *** presence of ZnO obviously enhanced the dimerization of isobutene and ZnO(X)/ZrO_(2)-SO_(4) exhibited the highest di-isobutene yield of 60%.Kinetic studies showed the higher trimerization-to-dimerization activation energy ratios of ZnO(X)/ZrO_(2)-SO_(4) than those of ZrO_(2)-SO_(4) from 353 to 393 *** addition,reaction rate of dimerization was higher than trimerization over ZnO(X)/ZrO_(2)-SO_(4).The high L/B ratio manifested the capability to enhance the selectivity of C8 in isobutene ***,ZnO(X)/ZrO_(2)-SO_(4) exhibited stable conversion for the dimerization of isobutene.

关键词： Sulfated zirconia Zinc oxide Isobutene Selectivity Chemical reaction Catalysis

Relationships between the activities and Ce^(3+)concentrations of CeO_(2)(111)for CO oxidation:A first-principle investigation

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Chinese Chemical Letters 2021年第3期32卷 1127-1130页

作者： jiyuan Liu xueqing Gong Key Laboratory for Advanced Materials Centre for Computational Chemistry and Research Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

CO oxidation at ceria surfaces has been studied for decades,and many efforts have been devoted to understanding the effect of surface reduction on the catalytic *** this work,we theoretically studied the CO oxidation on the clean and reduced CeO_(2)(111)surfaces using different surface cells to dete rmine the relationships between the reduction degrees and calculated reaction *** is found that the calculated barrier for the direct reaction between CO and surface lattice O drastically decreases with the increase of surface reduction *** electronic analysis,we found that the surface reduction can lead to the occurrence of localized electrons at the surface Ce,which affects the charge distribution at surface *** the result,the surface O becomes more negatively charged and therefore more active in reacting with *** work then suggests that the localized 4 f electron reservoir of Ce can act as the"pseudo-anion"at reduced CeO_(2) surfaces to activate surface lattice O for catalytic oxidative reactions.

关键词： CO oxidation CeO_(2)(111) Mars-van krevelen mechanism DFT+U Surface reduction

New Zircon U-Pb Ages of Mylonitic Granite in the Baluntai Area of the Central Tianshan Block and their Geological Implications

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Acta Geologica Sinica(English Edition) 2019年第4期93卷 1149-1151页

作者： TAO Zaili YIN jiyuan CHEN Wen LI Dapeng CAI Keda xu Zhihua DU Qiuyi School of Earth Sciences and Resources China University of GeosciencesBeijing100083China Key Laboratory of Deep-Earth Dynamics of Ministry of Natural Resources Institute of GeologyChinese Academy of Geological SciencesBeijing 100037China

Objective The central Tianshan block mainly consists of the Precambrian metamorphic basement,Ordovician–Silurian meta-sedimentary rocks and Carboniferous–Permian sedimentary rocks.

关键词： Pb Block Implications

Subduction channel fluid-rock interaction:Indications from rutile-quartz veins within eclogite from the Yuka terrane,North Qaidam orogen

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Geoscience Frontiers 2020年第2期11卷 635-650页

作者： Xin Chen Youye Zheng Rongke xu Pingyang Gu jiyuan Yu Jie Bai Pengjie Cai Xiaojia Jiang State Key Laboratory of Geological Processes and Mineral Resources and Faculty of Earth ResourcesChina University of GeosciencesWuhan 430074China State Key Laboratory of Geological Processes and Mineral Resources and School of Earth Science and ResourcesChina University of GeosciencesBeijing 100083China Xi’an Center of Geological Survey Geological Survey of ChinaXi’an 710054China

High-pressure(HP)or ultrahigh-pressure(UHP)rutile-quartz veins that form at mantle depths due to fluid-rock interaction can be used to trace the properties and behavior of natural fluids in subduction *** explore the fluid flow and the associated element mobility during deep subduction and exhumation of the continental crust,we investigated the major and trace elements of Ti-rich ***,U–Pb dating,trace element contents,and Lu–Hf isotopic composition of zircon grains in the UHP eclogite and associated rutile-quartz veins were examined in the North Qaidam UHP metamorphic belt,Yuka *** zircon grains in the rutile-quartz veins have unzoned or weak oscillatory zonings,and show low Th/U ratios,steep chondrite-normalized patterns of heavy rare earth elements(HREEs),and insignificant negative Eu anomalies,indicating their growth in metamorphic *** zircon grains formed in 4313 Ma,which is consistent with the 4322 Ma age of the host *** for the zircons in the rutile-quartz veins,they showed steep HREE patterns on one hand,and were different from the zircons present in the host eclogite on the *** demonstrates that their formation might have been related to the breakdown of the early stage of garnet,which corresponds to the abundance of fluids during the early exhumation *** core-rim profile analyses of rutile recorded a two-stage rutile growth across a large rutile grain;the rutile core has higher Nb,Ta,W,and Zr contents and lower Nb/Ta ratios than the rim,indicating that the rutile domains grew in different metamorphic fluids from the core towards the *** significant enrichment of high field strength elements(HFSEs)in the rutile core suggests that the peak fluids have high solubility and transportation capacity of these ***,variations in the Nb *** trends in rutile indicate a connection of rutile to mafic *** zircon grains from both the rutile-quartz veins and the host eclogite have s

关键词： Quartz-rutile veins Eclogite Fluid-rock interaction Fluid flow Yuka North Qaidam