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A novel intelligent vehicle risk assessment method combined with multi-sensor fusion in dense traffic environment

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Journal of Intelligent and Connected Vehicles 2018年第2期1卷 41-54页

作者： Xunjia Zheng Bin Huang Daiheng ni qing Xu Tsinghua University BeijingChina Department of Civil and Environmental Engineering Amherst College of EngineeringUniversity of MassachusettsAmherstMassachusettsUSA

Purpose–The purpose of this paper is to accurately capture the risks which are caused by each road user in ***/methodology/approach–The authors proposed a novel risk assessment approach based on the multi-sensor fusion algorithm in the real trafﬁc ***,they proposed a novel detection-level fusion approach for multi-object perception in dense trafﬁc environment based on evidence *** approach integrated four states of track life into a generic fusion framework to improve the performance of multi-object *** information of object type,position and velocity was accurately ***,they conducted several experiments in real dense trafﬁc environment on highways and urban roads,which enabled them to propose a novel road trafﬁc risk modeling approach based on the dynamic analysis of vehicles in a variety of driving *** analyzing the generation process of trafﬁc risks between vehicles and the road environment,the equivalent forces of vehicle–vehicle and vehicle–road were presented and theoretically *** prediction steering angle and trajectory were considered in the determination of trafﬁc risk inﬂuence ***–The results of multi-object perception in the experiments showed that the proposed fusion approach achieved low false and missing tracking,and the road trafﬁc risk was described as aﬁeld of equivalent *** results extend the understanding of the trafﬁc risk,which supported that the trafﬁc risk from the front and back of the vehicle can be perceived in ***/value–This approach integrated four states of track life into a generic fusion framework to improve the performance of multi-object *** information of object type,position and velocity was used to reduce erroneous data association between tracks and ***,the authors conducted several experiments in real dense trafﬁc environment on highways and urban roads,which enabled them to propose a novel road trafﬁc

关键词： Automated vehicles Advanced vehicle safety systems Autonomous driving Connected vehicles Environment perception Sensor information fusion

A new strategy for obtaining highly concentrated phosphorus recovery solution in biofilm phosphorus recovery process

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Journal of Environmental Sciences 2022年第2期34卷 366-375页

作者： Wanjing Yang Jie shan Yang Pan Zhen Bi Yong Huang Hao Zhang Min ni School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China National&Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology Suzhou University of Science and TechnologySuzhou 215009China

Recovery of phosphorus(P)from wastewater is of great significance for alleviating the shortage of P *** present,the P recovery process is faced with the problem of excessive organic carbon consumption when obtaining a P-concentrated recovery *** study proposed a new strategy to obtain a more highly concentrated P recovery solution with minimal carbon consumption by strengthening the P storage capacity of the biofilm.A biofilm sequencing batch reactor(BSBR)process was modified to treat synthetic *** effect of the dissolved oxygen(DO)concentration on the P storage capacity of the biofilm was investigated at DO concentrations of DO 3.5 mg/L(P_(L))and DO 6.5 mg/L(P_(H)).The results showed a maximum P storage of 101.2 and 149.6 mg-P/g-mixed liquid suspended solids under the two *** the P storage capacity of the biofilm resulted in a net increase in the P recovery rate,which was as high as 66.96%in a harvesting cycle,and total soluble P>220 mg/L in the P recovery solution was successfully ***,the carbon cost of P recovery in the BSBR was reduced to 41.57 g-chemical oxygen demand/gP,and the carbon utilization efficiency was *** highlight the new strategy,the P recovery performance of the BSBR was given and the relationship between P content and anaerobic P release was *** addition,the changes in the microbial communities under P_(L) and P_(H) conditions were analyzed.

关键词： Biofilm sequencing batch reactor Phosphorus storage capacity Phosphorus release Phosphorus recovery

An analytical solution for quantum scattering through a PT-symmetric delta potential

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Frontiers of physics 2021年第4期16卷 213-220页

作者： Ying-Tao Zhang shan Jiang qingming Li qing-Feng Sun College of Physics Hebei Normal UniversityShijiazhuang 050024China International Center for Quantum Materials School of PhysicsPeking UniversityBeijing 100871China Collaborative Innovation Center of Quantum Matter Beijing 100871China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100190China

We employ the Lippmann–Schwinger formalism to derive the analytical solutions of the transmission and reflection coefficients through a one-dimensional open quantum system,in which particle loss or gain on one lattice site located at x=0,or particle loss and gain on the lattice sites located at x=±L 2 are considered *** gain and loss on the lattice site are modeled by the delta potential with positive and negative imaginary *** analytical solution reveals the underlying physics that the sum of the transmission and reflection coefficients through an open quantum system(even a PT-symmetric open system)may not be 1,i.e.,qualitatively explains that the number of particles is not conserved in an open quantum ***,we find that the resonance states can be formed in the PT-symmetric delta potential,which is similar to the case of real delta *** results of our analysis can be treated as the starting point of studying quantum transport problems through a non-Hermitian system using Green’s function method,and more general cases for high-dimensional systems may be deduced by the same procedure.

关键词： transmission non-Hermitian PT-symmetry Green function

Microstructure and Tribological Behavior of a TiO_2/hBN Composite Ceramic Coating Formed via Micro-arc Oxidation of Ti–6Al–4V Alloy

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Journal of Materials Science & Technology 2016年第10期32卷 1071-1076页

作者： ni Ao Daoxin Liu Shuaixing Wang qing Zhao Xiaohua Zhang Mengmeng Zhang College of Aeronautics Institute of Corrosion and Protection Northwestern Polytechnical University National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong University

A composite coating containing hexagonal boron nitride（hBN） particles and titanium oxide（TiO_2） was formed on the surface of Ti-6Al-4V alloy via micro-arc oxidation（MAO）. The effect of quantity of the hBN-particles added into electrolyte on microstructure, composition, and wear behavior of the resulting composite coatings was investigated. Microstructure, phase composition, and tribological behavior of the resulting MAO coatings were evaluated via scanning electron microscopy, X-ray diffraction, and ball-on-disc abrasive tests. The results reveal that the TiO_2/hBN composite coating consisting of rutile TiO_2, anatase TiO_2, and an hBN phase was less porous than particle-free coating. Furthermore, the presence of hBN particles in the MAO coating produced an improved anti-friction property. The composite coating produced in the electrolyte containing 2 g/L of hBN particles exhibited the best wear *** outer loose layer of the MAO coatings was removed by a mechanical polishing process, which led to a significant improvement in the wear resistance and anti-friction properties of the MAO coatings and highlighted an essential lubricating role of hBN particles in the composite coatings. However, wear mechanism of the MAO coatings was not relevant to the presence of hBN particles, where fatigue wear dominated the anti-fraction properties of the MAO coatings with and without hBN particles.

关键词： Ti-6Al-4V alloy Micro arc oxidation hBN particle Wear

Instantaneous deformation characteristics of a single bubble in immiscible fluids

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Journal of Iron and Steel Research International 2022年第10期29卷 1601-1612页

作者： Jia-rui Xu Xiao-hui Zhang shan qing Hao Zhang Hua Wang Faculty of Metallurgical and Energy Engineering Kunming University of Science and TechnologyKunming650093YunnanChina National Local Joint Engineering Research Center of Energy Saving and Environmental Protection Technology in Metallurgy and Chemical Engineering Industry Kunming University of Science and TechnologyKunming650093YunnanChina

The passage of a rising bubble through immiscible fluids is encountered in bath *** order to investigate characteristics of bubble deformation in immiscible fluids,the bubble shape change at the interface and the relationship between the bubble aspect ratio(E)and dimensionless number of forces were obtained.A three-dimensional model was established,and the free-floating behavior of a single bubble in immiscible fluids was numerically simulated by phase-field *** simulation results are in good agreement with experimental *** results indicate that when the bubble passes through the interface,the bubble shape is divided into four types in turn:“pear”,inverted“pear”,“convex”and“droplet”*** the lower liquid,the relationship of E to Weber number(We),Tadaki number(Ta),and Reynolds number(Re)is distributed between two intersecting *** relationship of E to Eötvös number(Eo),a dimensionless group,and Galilei number(Ga)is distributed near the lines with slopes of−3.325×10^(-5),−0.0855,and−8.73×10^(-4),*** the upper liquid,the relationship of E to We,Ta,and Re is distributed between two parallel *** with gravity,the inertial force plays a leading role in the bubble shape in the lower and upper *** with the viscous force,the surface tension dominates the bubble shape in the lower liquid.

关键词： Bubble shape Immiscible fluid Dimensionless number Phase-field method

nickel-catalyzed hydromonofluoromethylation of unactivated alkenes for expedient construction of primary alkyl fluorides

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Chinese Chemical Letters 2023年第3期34卷 279-282页

作者： shan-Xiu ni Yan-Lin Li Hui-Qi ni Yu-Xiang Bi Jie Sheng Xi-Sheng Wang Department of Chemistry University of Science and Technology of ChinaHefei 230026China

A nickel-catalyzed direct hydromonofluoromethylation of unactivated olefins with industrial raw fluoroiodomethane is developed,furnishing various primary alkyl fluorides in a step-economic *** key factor to success is the use of pyridine-oxazoline as ligand and(MeO)_(2)MeSiH as the hydrogen *** transformation demonstrates high efficiency,mild conditions,good functional-group compatibility and great potential in the drug discovery.

关键词： Hydromonofluoromethylation Unactivated alkenes nickel-catalysis Primary fluorides ni-H species

A Structured Ultramicroporous Metal-Organic Framework for Carbon Dioxide Capture

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Chinese Journal of Chemistry 2023年第7期41卷 763-768页

作者： Shao-Min Wang Hao-Ran Liu Shuang ni qing-Yuan Yang School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'anShaanxi710049 China

Comprehensive Summary Carbon dioxide(CO_(2))capture is one of the most important aspects of reducing global *** terms of CO_(2)capture,metal-organic frameworks(MOFs)have several ***,it isn't easy to shape MOFs while maintaining their ***,we describe the development of a pellet-shaped ultramicroporous MOF,ni(3-ain)2(3-ain=3-aminoinoisonicotinic acid),that is capable of selectively adsorbing CO_(2).Polyvinyl butyral(PVB)is used as a binder during the production of ni(3-ain)2 MOF *** adequately shaped material can maintain its crystallinity and exhibit a high CO_(2)adsorption capacity(3.73 mmol·g^(-1))at ambient conditions,which is significantly greater than those obtained for N_(2)(0.63 mmol·g^(-1))and CO(0.90 mmol·g^(-1)).Consequently,this material displays high IAST selectivities for CO_(2)/N_(2)(26.3,15/85,V/V)and CO_(2)/CO(19.2,1/99,V/V).According to the theoretical calculations,ni(3-ain)2 preferentially adsorbs CO_(2)molecules over N_(2)molecules and CO *** results of experiments on dynamic breakthrough have demonstrated that ni(3-ain)2 pellets are capable of effectively separating CO_(2)/N_(2)or CO_(2)/CO mixtures under conditions of dynamic ***,the structured MOF materials can be synthesized in one step at kilogram *** work provides an avenue for the shaping of MOFs for potential industrial applications in the future.

关键词： Metal-organic framework Shaping Separation Carbon capturel Crystal engineering Microporous materials

Microstructure and properties of nano-TiN modified Ti(C,N)-based cermets fabricated by powder injection molding and die pressing

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International Journal of Minerals,Metallurgy and Materials 2013年第11期20卷 1115-1121页

作者： shan-jie Yi Hai-qing Yin Ke Chen Dil-Faraz Khan qing-jun Zheng Xuan-hui Qu School of Materials Science and Engineering University of Science and Technology Beijing Department of Physics University of Science and Technology Bannu Kennametal Inc. 1600 Technology Way Latrobe

Powder injection molding （PIM） and die pressing were employed to fabricate nano-TiN modified Ti（C,N）- based cermets. The shrinkage behavior, microstructure, porosity, and mechanical properties of the samples with and without nano-TiN addition fabricated by PIM and die pressing were analyzed. It is demonstrated that for either PIM or die pressing, the porosities are obviously reduced, the mechanical properties are significantly improved after adding nano-TiN, and the hard particles are refined; the rim phase thickness obviously becomes thinner, and the number of dimples in fracture also increases. Compared the samples fabricated by die pressing, it is difficult for PIM to obtain dense Ti（C,N）-based cermets. Due to the too much existence of pores and isolated carbon, the mechanical properties of the sintered samples by PIM are inferior to those of the sintered ones by die pressing.

关键词： cermets powder injection molding die pressing titanium nitride nanoparticles mechanical properties

A highly sensitive dopamine sensor based on a polyaniline/reduced graphene oxide/Nafion nanocomposite

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Chinese Chemical Letters 2017年第1期28卷 41-48页

作者： Li-qing Xie Yan-Hui Zhang Fei Gao Quan-An Wu Piao-Yang Xu shan-shan Wang ning-ning Gao qing-Xiang Wang College of Chemistry and Environment Minnan Normal University Zhangzhou 363000 China Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology Minnan Normal University Zhangzhou 363000 China

A nanocomposite of polyaniline/reduced graphene oxide（PAni-r GO） was synthesized using a hydrothermal method. The product was characterized by FT-IR, Raman spectra, XRD, SEM and *** the hybrid material of PAni-r GO and Nafion（PAni-rGO-NF） was prepared and used to modify glassy carbon electrode for the trace determination of dopamine（DA） employing differential pulse voltammetry（DPV）. It was found that the hybrid material showed good catalytic activity toward the oxidation of DA, and no response to ascorbic acid（AA） and uric acid（UA） was observed, suggesting a high selectivity of the sensor toward DA. The peak currents were linearly correlated with the concentration of DA in the range from 0.05 mmol/L to 60.0 mmol/L（R = 0.996） and 60.0 mmol/L to 180.0 mmol/L（R = 0.996） with a detection limit of 0.024 mmol/L（S/N = 3）. The modified electrode also exhibited excellent repeatability and stability.

关键词： Dopamine Graphene oxide Electrochemical Nation Polyaniline