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Visual Localization in Urban Area Using Orthogonal Building Boundaries and a GIS Database

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机器人 2012年第5期34卷 604-613,619页

作者： LI Haifeng LIU Jingtai lu xiang Civil Aviation University of China Tianjin 300300 China Institute of Robotics and Automatic Information System Nankai University Tianjin 300071 China

A framework is presented for robustly estimating the location of a mobile robot in urban areas based on images extracted from a monocular onboard camera, given a 2D map with building outlines with neither 3D geometric information nor appearance data. The proposed method firstly reconstructs a set of vertical planes by sampling and clustering vertical lines from the image with random sample consensus (RANSAC), using the derived 1D homographies to inform the planar model. Then, an optimal autonomous localization algorithm based on the 2D building boundary map is proposed. The physical experiments are carried out to validate the robustness and accuracy of our localization approach.

关键词：机器人设计人工智能信息处理

A Lightweight Anonymous Device Authentication Scheme for Information-Centric Distribution Feeder Microgrid

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Computers, Materials & Continua 2021年第11期69卷 2141-2158页

作者： Anhao xiang jun Zheng Department of Computer Science and Engineering New Mexico Institute of Mining and TechnologySocorro87801NMUSA

Distribution feeder microgrid(DFM)built based on existing distributed feeder(DF),is a promising solution for modern *** contains a large number of heterogeneous devices that generate heavy network traffice and require a low data delivery *** information-centric networking(ICN)paradigm has shown a great potential to address the communication requirements of smart ***,the integration of advanced information and communication technologies with DFM make it vulnerable to cyber *** authentication of grid devices is essential for preventing unauthorized accesses to the grid network and defending against cyber *** this paper,we propose a new lightweight anonymous device authentication scheme for DFM supported by named data networking(NDN),a representative implementation of *** perform a security analysis to show that the proposed scheme can provide security features such as mutual authentication,session key agreement,defending against various cyber attacks,anonymity,and resilience against device capture *** security of the proposed scheme is also formally verified using the popular AVISPA(Automated Validation of Internet Security Protocols and Applications)*** computational and communication costs of the proposed scheme are *** results demonstrate that the proposed scheme achieves significantly lower computational,communication and energy costs than other state-of-the-art schemes.

关键词： Mutual authentication information-centric networking named data networking distribution feeder microgrid smart devices AVISPA security

CO_2 capture through halogen bonding: A theoretical perspective

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Science China Chemistry 2012年第8期55卷 1566-1572页

作者： LI HaiYing lu Yunxiang ZHU xiang PENG Changjun HU jun LIU HongLai HU Ying State Key Laboratory of Chemical Engineerin0g Department of ChemistryEast China University of Science and TechnologyShanghai 200237China

Halogen bonding interactions between several halogenated ion pairs and CO2 molecules have been investigated by means of density functional theory calculations. To account for the influence of solvent environment, the implicit polarized continuum model was also employed. The bromide and iodide cations of ionic liquids (ILs) under study can interact with CO2 molecules via X O interactions, which become much stronger in strength than those in the complexes of iodo-perfluorobenzenes, very effective halogen bond donors, with CO2 molecules. Such interactions, albeit somewhat weaker in strength, are also observed between halogenated ion pairs and CO2 molecules. Thus, the solubility of CO2 may be improved when using halogenated ILs, as a result of the formation of X O halogen bonds. Under solvent effects, the strength of the interactions tends to be weakened to some degree, with a concomitant elongation of intermolecular distances. The results presented here would be very useful in the design and synthesis of novel and potent ILs for CO2 physical absorption.

关键词： halogen bonding interactions CO2 physical absorption calculations

Sustainable Management of Rice Insect Pests by Non-Chemical-Insecticide Technologies in China

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Rice science 2017年第2期24卷 61-72页

作者： XU Hong-xing YANG Ya-jun lu Yan-hui ZHENG Xu-song TIAN jun-ce LAI Feng-xiang FU Qiang lu Zhong-xian Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control Institute of Plant Protection and MicrobiologyZhejiang Academy of Agricultural SciencesHangzhou 310021China China National Rice Research Institute Hangzhou 310006China

Chemical pesticides play crucial roles in the management of crop diseases and pests. However, excessive and irrational use of pesticides has become a major concern and obstacle to sustainable agriculture. As a result, the quality and security of agricultural products are reduced, and the ecological and environmental integrities are threatened. Recently, environment-friendly pest management measures have been introduced and adopted to manage rice insect pests and reduce the use of insecticides. This paper reviewed the advancements in development and application of non-chemical technologies for insect pest management during rice production in China.

关键词： rice chemical insecticide reduce insecticide non-chemical pest management ecological and environmental integrity

Unsteady Flow Simulations in a Three-lobe Positive Displacement Blower

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Chinese Journal of Mechanical Engineering 2014年第3期27卷 575-583页

作者： LIU Xiaomin lu jun School of Energy and Power Engineering Xi'an Jiaotong University

To improve the performance of the positive displacement blower, it is imperative to understand the detailed internal flow characteristics or enable a visualization of flow status. However, the existing two-dimensional unsteady, three-dimensional steady or quasi-unsteady numerical simulation and theoretical analysis cannot provide the detailed flow information, which is unfavorable to improve the performance of positive displacement blower. Therefore, the unsteady flow characteristics in a three-lobe positive displacement blower are numerically investigated by solving the three-dimensional, unsteady, compressible Navier-Stokes equations coupled with RNG k-e turbulent model. In the numerical simulation, the dynamic mesh technique and overset mesh updating method are adopted. Due to the air being compressed in the process of the rotors rotating, the variation of the temperature field in the positive displacement blower is considered. By comparing the experimental measurements and the numerical results on the variation of flow rate with the outlet pressure, the maximum relative error of the flow rate is less than 2.15% even at the maximum outlet pressure condition, which means that the calculation model and numerical computational method used are effective. The numerical results show that in the intake region, the fluctuations of the inlet flow are greatly affected by the direction of the velocity vectors. In the exhaust region, the temperature changes significantly, which leads to the increase of the airflow pulsation. Through analysis on the velocity, pressure and temperature fields obtained from the numerical simulations, three-dimensional unsteady flow characteristics in the positive displacement blower are revealed. The studied results will provide useful reference for improving the performance and empirical correction in the design of the positive displacement blower.

关键词： three-lobe positive displacement blower unsteady flow dynamic mesh technique numerical simulation

Robust self-supported anode by integrating Sb2S3 nanoparticles with S,N-codoped graphene to enhance K-storage performance

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Science China Chemistry 2017年第12期60卷 1533-1539页

作者： Yanying lu jun Chen Key Laboratory of Advanced Energy Materials Chemistry Ministry of Education College of Chemistry Nankai University Tianjin 300071 China

Developing high-performance anode materials for potassium-ion batteries is significantly urgent. We here demonstrate Sb_2S_3 nanoparticles(~20 nm) homogeneously dispersed in porous S,N-codoped graphene framework(Sb_2S_3-SNG) as a self-supported anode material for potassium-ion batteries. The rational structure design of integrating Sb_2S_3 nanoparticles with S,N-codoped graphene contributes to high reactivity, strong affinity, good electric conductivity, and robust stability of the composite, enabling superior K-storage performance. Moreover, the self-supported architecture significantly decreases the inactive weight of the battery, resulting in a high energy density of a Sb_2S_3-SNG/KVPO_4 F-C full cell to ~166.3 W h kg^(-1).

关键词： Sb2S3 nanoparticles S,N-codoping self-supported graphene foam anode potassium-ion batteries

Effects of the tensor force on low-energy heavy-ion fusion reactions:a mini review

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Communications in Theoretical Physics 2022年第9期74卷 275-283页

作者： xiang-xiang Sun lu Guo School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

In recent several years,the tensor force,one of the most important components of the nucleon-nucleon force,has been implemented in time-dependent density functional theories and it has been found to influence many aspects of low-energy heavy-ion reactions,such as dissipation dynamics,sub-barrier fusions,and low-lying vibration states of colliding ***,the effects of tensor force on fusion reactions have been investigated from the internuclear potential to fusion crosssections *** this work,we present a mini review on the recent progress on this *** the recent progress of low-energy reaction theories,we will also mention more possible effects of the tensor force on reaction dynamics.

关键词： low-energy heavy-ion collision time-dependent density functional theory ion-ion potential fusion cross sections tensor force

THE URBAN FUNCTION OF SUZHOU ON BASIS OF THE SHANGHAI-SUZHOU RELATIONSHIP

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Chinese Geographical Science 2001年第3期11卷 42-49页

作者： jun Zou lu Zhang Min-qi Chen Jing-xiang Zhang Department of Urban and Resources Science Nanjing University Nanjing P. R. China

Economic globalizationandknowled ge economy provide newopportunity f or development of Suzhou,a histori-cal city which has traditional intim ate relationship with *** s paper aims at exploring the chances and chal-lenges faced by Suzhou at the newcent ury and makes the quantitative analy sis of the urban function of the Suzhou Municipali-ty through the studies of the Greater Shanghai Metropolitan Area and the Shanghai-Suzhou *** re aches the conclu-sion that in the new century Suzhou sh all make the integrated development with Shanghai to be built into the pro cessing and manufacturing base with the high and new technology as the mainstay.I n the meantime Suzhou shall also beco me one of the research bases for the advanced technology and the modern tourist city with beautiful eco-environm ent.

关键词： Shanghai-Suzhou relationship Gre ater Shanghai Metropolitan Area Sh anghai-Suzhou integration

EXPONENTIALLY ADAPTIVE SYNCHRONIZATION OF AN UNCERTAIN DELAYED DYNAMICAL NETWORK

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Journal of Systems Science & Complexity 2011年第2期24卷 207-217页

作者： Qunjiao ZHANG jun'an lu College of Science Wuhan Textile University Wuhan 430073 China School of Mathematics and Statistics Wuhan University Wuhan 430072 China

Over the past decades, complex networks have been prosperous greatly in various fields of sciences and engineering. Much attention has been given to investigate the synchronization of complex networks in recent years. However, few work has done for the networks with uncertain parameters and unknown topology. In this paper, to further reveal the dynamical mechanism in complex networks with time delays, an uncertain general complex dynamical network with delayed nodes is studied. By constructing a drive network and a suitable slave network, several novel criteria for the networks consisting of the identical nodes and different nodes have been obtained based on the adaptive feedback method. Particularly, the hypotheses and the proposed adaptive laws for network synchronization are simple and can be readily applied in practical applications. Finally, numerical simulations are provided to illustrate the effectiveness of the proposed synchronization criteria.

关键词： Adaptive feedback synchronization complex networks delayed nodes uncertain parameter unknown topology.