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Efficiency-first spraying mission arrangement optimization with multiple UAVs in heterogeneous farmland with varying pesticide requirements

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Information Processing in Agriculture 2024年第2期11卷 237-248页

作者： Yang Li Yanqiang Wu Xinyu xue xuemei Liu Yang Xu Xinghua Liu Nanjing Institute of Agricultural Mechanization Ministry of Agriculture and Rural AffairsNanjing 210014PR China College of Mechanical&Electronic Engineering Shandong Agricultural UniversityTai'an 271018PR China Key Laboratory of Modern Agricultural Equipment Ministry of Agriculture and Rural AffairsNanjing 210014PR China Shandong Provincial Key Laboratory of Horticultural Machinery and Equipment Tai’an 271018PR China Shandong Provincial Engineering Laboratory of Agricultural Equipment Intellectualization Tai’an 271018PR China

Combining multiple crop protection Unmanned Aerial Vehicles(UAVs)as a team for a scheduled spraying mission over farmland now is a common way to significantly increase ***,given some issues such as different configurations,irregular borders,and especially varying pesticide requirements,it is more important and more complex than other multi-Agent Systems(MASs)in common *** this work,we focus on the mission arrangement of UAVs,which is the foundation of other high-level cooperations,systematically propose Efficiency-first Spraying Mission Arrangement Problem(ESMAP),and try to construct a united problem framework for the mission arrangement of crop protection ***,to characterise the differences in sub-areas,the varying pesticide requirement per unit is well considered based on Normalized Difference Vegetation Index(NDVI).Firstly,the mathematical model of multiple crop-protection UAVs is established and ESMAP is ***,an acquisition method of a farmland’s NDVI map is proposed,and the calculation method of pesticide volume based on NDVI is ***,an improved Genetic Algorithm(GA)is proposed to solve ESMAP,and a comparable combination algorithm is *** simulations for algorithm analysis are carried out within MATLAB,and it is determined that the proposed GA is more efficient and accurate than the ***,a mission arrangement tested with three UAVs was carried out to validate the effectiveness of the proposed GA in spraying *** results illustrated that it performed well,which took only 90.6%of the operation time taken by the combination algorithm.

关键词： Efficiency-first optimization Mission arrangement Multi-UAVs Heterogeneous farmland

Improving the thermal shock resistance of ceramics by crack arrest blocks

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Science China(Technological Sciences) 2016年第6期59卷 913-919页

作者： WANG Yan Wei XIA Biao SU Hong Hong CHEN Hang FENG xue Applied Mechanics Laboratory Department of Engineering Mechanics Tsinghua University Center for Mechanics and Materials Tsinghua University Department of Engineering Mechanics Chongqing University

Ceramics used in the high temperature environment are inevitably subjected to sudden temperature change, which may lead to catastrophic thermal shock failure due to the intrinsic brittleness of ceramics. In this paper, an experimental platform is designed to realize the in-situ observation during the thermal shock experiments. Experimental results show that all the cracks initiate from one of the edge midpoints and propagate to another one for square specimens. Such experimental observation is consistent with the maximum tensile stress zone with the maximum temperature gradient given by the finite element method(FEM). The different crack modes resulting from different heating rates after thermal shock experiments are observed and analyzed. Comparison between different clamping methods is conducted to study the effects of boundary conditions on the thermal shock experiments. Furthermore, in order to improve the thermal shock performance of alumina ceramics, crack arrest blocks are added near the edge midpoint. The thickness, shape and arrangement of the blocks are systematically investigated to understand the mechanism of improvement of thermal shock resistance.

关键词： thermal shock ultra-high temperature ceramics crack arrest blocks in-situ dynamic observation

Effect of Ce on Inclusions and Impact Property of 2Cr13 Stainless Steel

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Journal of Iron and Steel Research International 2010年第12期17卷 59-64页

作者： LIU Xiao YANG Ji-chun YANG Lin GAO xue-zhong Metallurgy Department Central Iron and Steel Research Institute Beijing 100081 China Materials and Metallurgy School Inner Mongolia University of Science and Technology Baotou 014010 Inner Mongolia China Engineering and Technology Division Advanced Technology and Materials Limited Company Beijing 100081 China The First Steelmaking Plant Angang Steel Company Limited Anshan 114021 Liaoning China

The effect of Ce on inclusions and impact toughness of 2Cr13 stainless steel were studied by SEM and electron spectroscopy. Thermodynamic calculation was used to analyze the formation of RE inclusions in 2Cr13 stainless steel. The result shows that Al2 O3 and MnS can be entirely replaced by Ce2 O2 S and CeS. Fracture is changed from cleavage to ductile fracture by adding Ce to the 2Cr13 stainless steel, and the spherical rare earth oxysulfide inclusions （Ce2 O2 S） in the dimple are the main factors. The transverse impact value of 2Cr13 stainless steel has been improved obviously by Ce. The transverse impact value of RE-2Cr13 is increased by 54.55% at the temperature of --40℃, comparing with 0RE-2Cr13.

关键词： rare earth 2Cr13 stainless steel inclusion thermodynamic calculation impact property

Driving pattern analysis of Nordic region based on National Travel Surveys for electric vehicle integration

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Journal of Modern Power Systems and Clean Energy 2015年第2期3卷 180-189页

作者： Zhaoxi LIU qiuwei WU Linda CHRISTENSEN Antti RAUTIAINEN Yusheng xue Centre for Electric Power and Energy(CEE) Department of Electrical EngineeringTechnical University of DenmarkElektrovej 325Kgs.Lyngby 2800Denmark Department of Transport Technical University of DenmarkKgs.Lyngby 2800Denmark Department of Electrical Engineering Tampere University of TechnologyTampere 33101Finland State Grid Electric Power Research Institute Nanjing 210003China

Electic vehicles(EVs)show great potential to cope with the intermittency of renewable energy sources(RES)and provide demand side flexibility required by the smart ***,EVs will increase the electricity *** scale integration of EVs will probably have substantial impacts on power *** paper presents a methodology to transform driving behavior of person into one of the cars in order to analyze the driving pattern of EVs based on the National Travel *** the proposed methodology,a statistical process is used to obtain the driving behavior of cars by grouping the survey respondents according to the driving license number and car number,and mapping the households with similar *** proposed methodology was used to carry out the driving pattern analysis in the Nordic *** detailed driving requirements and charging/discharging availability of vehicles along the day were *** types of EV availabilities were studied in this paper considering different charging/discharging conditions of EVs for the power system integration,*** availability all day and EV availability at *** results show that the daily driving requirements of the Nordic region are not very *** driving patterns of vehicles in the Nordic region vary on weekdays and *** two types of EV availabilities are quite different from each other.

关键词： Driving pattern Electric vehicles(EVs) EV availability Nordic Power system integration

Economy Analysis of Flexible LCC-HVDC Systems with Controllable Capacitors

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CSEE Journal of Power and Energy Systems 2022年第6期8卷 1708-1719页

作者： Nan Chen kunpeng Zha Haitao Qu Fangling Li Ying xue Xiao-Ping Zhang Department of Electronic Electrical and Systems EngineeringSchool of EngineeringUniversity of BirminghamBirmingham B152TTUK C-EPRI Electric Power Engineering Co.Ltd No.16Nanzhong RoadChangping DistrictBeijingChina Department of Electronic Electrical and Systems EngineeringSchool of EngineeringUniversity of BirminghamBirmingham B152TTUKand now is with the School of Electric Power EngineeringSouth China University of TechnologyGuangzhouChina

Commutation failure(CF)is a frequent dynamic event at inverter of LCC-HVDC systems caused by AC side faults which can lead to inverter blocking,interruption of active power transfer,and even system *** eliminate CFs and improve system performance,new Flexible LCC-HVDC topologies have been proposed in previous research but with limited analysis on its economic ***,to further validate the applicability of Flexible LCC-HVDC topologies,this paper utilizes Life-Cycle Cost Analysis model to analyze the life-cycle cost of inverter stations for conventional LCCHVDC,Capacitor Commutated Converter based HVDC(CCCHVDC)topology and Flexible LCC-HVDC topologies including Controllable Capacitor based Flexible LCC-HVDC,AC Filterless Controllable Capacitor based Flexible LCC-HVDC and improved Flexible *** a case study based on a 500 kV,1000 MW LCC-HVDC scheme,comparison results show that the AC Filterless Controllable Capacitor based Flexible LCCHVDC topology and the improved Flexible LCC-HVDC topology have lower cost than the conventional LCC-HVDC and CCCHVDC topologies,which proves that the elimination of CFs can be achieved with reduced cost.

关键词： LCC-HVDC Flexible LCC-HVDC controllable capacitor based(CC)LCC-HVDC AC Filterless CC(ACFL-CC)LCC-HVDC improved ACFL-CC LCC-HVDC CCC-HVDC commutation failure converter station economic analysis life-cycle cost LCC controllable capacitor AC filterless

Histone deacetylase 3 promotes innate antiviral immunity through deacetylation of TBK1

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Protein & Cell 2021年第4期12卷 261-278页

作者： Jie-lin Tang qi Yang Chong-hui Xu He Zhao Ya-ling Liu Can-yu Liu Yuan Zhou Dong-wei Gai Rong-juan Pei Yun Wang xue Hu Bo Zhong Yan-yi Wang Xin-wen Chen Ji-zheng Chen State Key Laboratory of Virology Wuhan Institute of VirologyCenter for Biosafety Mega-ScienceChinese Academy of SciencesWuhan 430071China University of Chinese Academy of Sciences Beijing 100049China Medical Research Institute School of MedicineWuhan UniversityWuhan 430071China Guangzhou Institutes of Biomedicine and Health Chinese Academy of SciencesGuangzhou 510530China

TANK-binding kinase 1(TBK1),a core kinase of antiviral pathways,activates the production of interferons(IFNs).It has been reported that deacetylation activates TBK1;however,the precise mechanism still remains to be *** show here that during the early stage of viral infection,the acetylation of TBK1 was increased,and the acetylation of TBK1 at Lys241 enhanced the recruitment of IRF3 to ***3 directly deacety-lated TBK1 at Lys241 and Lys692,which resulted in the activation of *** at Lys241 and Lys692 was critical for the kinase activity and dimerization of TBK1 *** knockout cell lines and transgenic mice,we confirmed that a HDAC3 null mutant exhibited enhanced susceptibility to viral challenge via impaired production of type I ***,activated TBK1 phosphorylated HDAC3,which promoted the deacetylation activity of HDAC3 and formed a feedback *** this study,we illustrated the roles the acetylated and deacetylated forms of TBK1 play in antiviral innate responses and clarified the post-trans-lational modulations involved in the interaction between TBK1 and HDAC3.

关键词： TBK1 HDAC3 deacetylation IRF3 innate immune

Double-induced-mode integrated triboelectric nanogenerator based on spring steel to maximize space utilization

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Nano Research 2016年第11期9卷 3355-3363页

作者： Guanlin Liu Hengyu Guo Lin Chen xue Wang Dapeng Wei Chenguo Hu Department of Applied Physics Chongqing University Chongqing 400044 China Chongqing Engineering Research Center of Graphene Film Manufacturing Chongqing 401329 China

Integrated multilayered triboelectric nanogenerators （TENGs） are an efficient approach to solve the insufficient energy problem caused by a single-layered TENG for achieving high output power density. However, most integrated multilayered TENGs have a relatively large volume. Here, a double-induced-mode integrated triboelectric nanogenerator （DI-TENG） based on spring steel plates is presented as a cost-effective, simple, and high-performance device for ambient vibration energy harvesting. The unique stackable rhombus structure, in which spring steel plates act both as skeletons and as electrodes, can enhance the output performance and maximize space utilization. The DI-TENG with five repeated units in a volume of 12 cm × 5 cm × 0.4 cm can generate a short-circuit current of 51 μA and can transfer charges of 1.25 μC in a half period. The contrast experiment is conducted systematically and the results have proved that the DI-TENG has a great advantage over the single-induced-mode TENG （SI-TENG） with only one side of a friction layer on its electrode. Besides, the DI-TENG can easily power a commercial calculator and can be used as a door switch sensor.

关键词： triboelectric nanogenerator double-induced-mode spring steelstackable rhombus structure

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FPGA技术在中药智能制药中的应用探讨

中草药 2023年第1期54卷 283-291页

作者：李小莉薛启隆苗坤宏赵倩于洋李正天津中医药大学中药制药工程学院天津301617 省部共建组分中药国家重点实验室天津301617 现代中医药海河实验室天津301617

传统中药制造业正不断向数字化、信息化、智能化升级,这对智能化硬件提出了更高的要求。现场可编程门阵列(field-programmable gate array,FPGA)具有多通道同步信号采集、快速数据处理、高性能、低功耗等优势,在社会生产的诸多领域已被... 详细信息

传统中药制造业正不断向数字化、信息化、智能化升级,这对智能化硬件提出了更高的要求。现场可编程门阵列(field-programmable gate array,FPGA)具有多通道同步信号采集、快速数据处理、高性能、低功耗等优势,在社会生产的诸多领域已被广泛应用。对FPGA组成和工业应用优势进行介绍,结合中药制药工业应用场景的原理和领域知识,对FPGA技术在中药智能制药中的应用进行探讨研究,主要涉及制药过程信号采集、图像处理、深度学习3个方面,以期为中药制药行业过程控制、工艺优化等提供技术参考。

关键词：现场可编程门阵列中药智能制药信号采集图片处理深度学习

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两宋江南地区“冶游”之风与词人心理

苏州大学学报（哲学社会科学版） 2007年第6期23卷 70-74页

作者：薛玉坤苏州大学文学院江苏苏州215123

本文通过描述两宋江南地区词人的冶游之风,展现其生活情趣和审美理想,并在分析"冶游"文化内涵的基础上,指出江南地区之所以冶游之风盛行,除了和江南地区经济的繁荣、冶游传统有关之外,实是因为宋代词人身处积贫积弱之世,在佳人命薄和文... 详细信息

本文通过描述两宋江南地区词人的冶游之风,展现其生活情趣和审美理想,并在分析"冶游"文化内涵的基础上,指出江南地区之所以冶游之风盛行,除了和江南地区经济的繁荣、冶游传统有关之外,实是因为宋代词人身处积贫积弱之世,在佳人命薄和文人不偶之间找到了共通的苦楚。

关键词：宋代江南词人冶游文化心理