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A Comprehensive Review of Group Activity Recognition in Videos

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International Journal of Automation and computing 2021年第3期18卷 334-350页

作者： li-fang wu Qi Wang Meng Jian Yu Qiao Bo-Xuan Zhao College of Information and Communication Engineering Beijing University of TechnologyBeijing 100124China Beijing Municipal Key Lab of Computation Intelligence and Intelligent Systems Beijing University of TechnologyBeijing 100124China Shenzhen Institutes of Advanced Technology Chinese Academy of SciencesShenzhen 518055China

Human group activity recognition(GAR)has attracted significant attention from computer vision researchers due to its wide practical applications in security surveillance,social role understanding and sports video *** this paper,we give a comprehensive overview of the advances in group activity recognition in videos during the past 20 ***,we provide a summary and comparison of 11 GAR video datasets in this ***,we survey the group activity recognition methods,including those based on handcrafted features and those based on deep learning *** better understanding of the pros and cons of these methods,we compare various models from the past to the ***,we outline several challenging issues and possible directions for future *** this comprehensive literature review,readers can obtain an overview of progress in group activity recognition for future studies.

关键词： Group activity recognition(GAR) human activity recognition scene understanding video analysis computer vision

Analysis of Arc Physical Property of Pulsed Tungsten Inert Gas Welding Based on Fowler-Milne Method

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Journal of Shanghai Jiaotong university(Science) 2013年第3期18卷 343-347页

作者： WANG lin HUA Xue-ming XIAO Xiao li fang wu Yi-xiong Welding Engineering Institute Shanghai Jiaotong University Shanghai Key Laboratory of Materials Laser Manufacturing and Modification Shanghai 200240 China

Pulsed tungsten inert gas （TIG） welding is widely used in industry due to its superior properties, so the measurement of arc telnperature is important to analyse welding process. Arc image of spectral line in 794.8 nm is captured by high speed camera; both the Abel inversion and the Fowler-Milne method are used to calculate the temperature distribution of the pulsed TIG welding. Characteristic of transient variation in arc intensity and temperature is analyzed. When the change of current happens, intensity and temperature of arc jump as well, it costs several millisoconds. The flirther the axial position from the tungsten is, the greater the intensity jumps, and the smaller the temperature changes.

关键词： pulsed tungsten inert gas (TIG) welding Fowler-Milne method arc temperature transient variation

Spatially explicit reconstruction of cropland cover in Europe from AD 1800 to 2000

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Science China Earth Sciences 2024年第9期67卷 2953-2971页

作者： Jun li Yu YE Xiuqi fang Diyang ZHANG Zhilei wu Faculty of Geographical Science Beijing Normal UniversityBeijing 100875China Key Laboratory of Environmental Change and Natural Disaster Ministry of EducationBeijing Normal UniversityBeijing 100875China College of Geographical Science Qinghai Normal UniversityXining 810016China

One of the challenges in global change research is the significant uncertainty in global historical land use and land cover(LUCC)datasets,which are widely used as foundational *** addition to the regional cropland area reconstructions,improving the grid allocation method is another feasible way to raise the reliability of historical LUCC *** this study,an integrated reconstruction of the national cropland areas over the past 200 years was developed for 36 European *** that,the allocation algorithm was built using physiogeographic variables and historical city sites for accounting for land suitability and cultivation preferences,***,cropland data in Europe with a spatial resolution of 5′×5′at five time sections from AD 1800 to 2000 were generated using the optimal allocation algorithm in accordance with the stages of the regional *** results were as follows:(1)The dominant factors governing the distribution of croplands in Europe vary at different agricultural stages,but the results can be merged *** suitability was more optimal for allocation during the modern agricultural stage(AD 1950 and 2000);the priority index combined with land suitability and cultivation preference was more reasonable for allocation during the traditional agricultural stage(AD 1800).The average of the allocations by priority index and the land suitability could be adopted as the allocation results during the transitional stage(AD 1850 and 1900)because the grids for absolute differences within±10 and±20 percentage points between the results obtained from the above two allocations were above 80% and 95%,respectively,which means the two allocation results could be merged.(2)Over the past 200 years,the total cropland area in Europe first increased to a peak in AD 1900 and then ***,the centre of the higher cropland fraction shifted from the western part of Europe in AD 1800 to the eastern part of the continent after AD 1950.(3)

关键词： Land use and land cover change Historical cropland Gridding allocation Europe Past 200 years

Electrochemical intercalation reaction of lithium into sulfides of nonlayer structure ——Ⅰ.lithium intercalation in lead sulfide

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Acta Chimica Sinica(English Edition) 1987年第4期5卷 287-293页

作者： li Yong-fang wu Hao-Qing Department of Chemistry,Fudan University,Shanghai Department of Chemistry Fudan University Shanghai

The reaction mechanism of cell li/PbS has been studied with coulombic titration,cyclicvoltammetry and X-ray diffraction *** was found that in the first stage of discharge（0lithium into lead sulfide took *** X-ray diffraction patterns showedthat the main crystalline structure of PbS remained unchanged after lithiation,and the lithium inter-calated probably locates in the center of the cubic-interspace of the *** intercalation freeenergy of li into PbS forming liPbS was found to be-300.48 ***-1（at 25℃）.The chemicaldiffusion coefficient of lithium in liyPbS（0

关键词： Electrochemical intercalation reaction of lithium into sulfides of nonlayer structure

Molecular Characterization and Antibacterial Activity of a G-Type Lysozyme in Yellow Drum(Nibea albiflora)

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Journal of Ocean University of China 2024年第2期23卷 477-486页

作者： XIAO Yao li Jiacheng TIAN Qianqian wu Baolan HAN fang State Key Laboratory of Mariculture Breeding Fisheries College of Jimei UniversityXiamen 361021China

Lysozyme(EC3.***.1.17)plays an important role in the immune response;as a nonspecific immune factor,it can resist causative *** can be divided into c-type and g-type in *** a previous study,through genome-wide association analysis,the g-type lysozyme gene,which is named NaLyg in yellow drum(Nibea albiflora),was found to be a key candidate gene for disease resistance in response to Vibrio harveyi *** cDNA of NaLyg was 1025 bp,including four exons and three introns,and its open reading frame(ORF)had a full-length of 582 bp,encoding 193 amino *** was found to be conserved during evolution through bioinformatic *** NaLyg protein possessed a sugar binding domain and three catalytic sites,including Glu71,Asp84 and *** qRT-PCR results confirmed that NaLyg gene mRNA was visibly increased after *** *** NaLyg protein purified by prokaryotic expression killed some gram-negative bacterial pathogens by inducing cell wall destruction,including ***,Aeromonas hydrophila and Edwardsiella ***,the NaLyg protein killed two gram-positive bacteria,Bacillus subtilis and Staphylococcus *** together,the experimental results suggested that the NaLyg protein of *** played an important role in fighting bacterial infections.

关键词： Nibea albiflora innate immunity Vibrio harveyi g-type lysozyme antibacterial activity

Two-Dimensional Perovskite Single Crystals for High-Performance X-ray Imaging and Exploring MeV X-ray Detection

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Energy & Environmental Materials 2024年第1期7卷 143-150页

作者： Xieming Xu Yiheng wu Yi Zhang Xiaohui li fang Wang Xiaoming Jiang Shaofan wu Shuaihua Wang Key Laboratory of Optoelectronic Materials Chemistry and Physics Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences University of Chinese Academy of Sciences Division of Nuclear Technology and Applications Institute of High Energy Physics Chinese Academy of Sciences Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China

Scintillation semiconductors play increasingly important medical diagnosis and industrial inspection ***,two-dimensional(2D) perovskites have been shown to be promising materials for medical X-ray imaging,but they are... 详细信息

关键词： MeV X-ray detection single-crystal X-ray detectors two-dimensional perovskites X-ray imaging

Effect of acupressure on sleep quality of middle-aged and elderly patients with hypertension

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International Journal of Nursing Sciences 2014年第4期1卷 334-338页

作者： li-Wei Zheng Yao Chen Feng Chen Ping Zhang li-fang wu Fujian University of Traditional Chinese Medicine FuzhouChina Department of Cardiology Fujian General HospitalFuzhouChina

Purpose:To evaluate the effect of acupressure on blood pressure and sleep quality in middle-aged and elderly patients with ***:A total of 75 elderly hypertensive patients with sleep disorders were randomly divided into either an experimental group(n=38)or a control group(n=37).All subjects received conventional treatment and health *** experimental group also received acupressure *** score of PSQI(Pittsburgh Sleep Quality Index)and blood pressure were measured and recorded before and after the ***:After the intervention,the systolic(SBP)and diastolic blood pressure of the experimental group decreased significantly(plity in middleaged and elderly patients with hypertension.

关键词： Acupressure Hypertension Sleep quality

SO_(2)-Insertion induced enantioselective oxysulfonylation to access β-chiral sulfones with quaternary carbon stereocenters

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Science China Chemistry 2024年第3期67卷 908-913页

作者： Jun Zhang Xuefeng Wang Peiqi Wang Jiayuan fang Shaoyu li Jie wu School of Pharmaceutical and Chemical Engineering&Institute for Advanced Studies Taizhou UniversityShanghai 200438China Department of Chemistry Fudan UniversityShanghai 200438China State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China School of Chemistry and Chemical Engineering Henan Normal UniversityXinxiang 453007China

β-Chiral sulfones are structural motifs widely found in natural products and bioactive molecules, while also serving as important intermediates for the synthesis of valuable chiral scaffolds. In contrast to the rapid growth of sulfur dioxide insertion chemistry over the last decade, enantioselective catalytic variants for accessing β-chiral sulfones, especially those bearing a quaternary carbon stereocenter, remain rare. Herein, we report an enantioselective copper/bisoxazoline catalyzed oxysulfonylation of alkenes to yield isoxazolinyl-containing β-chiral sulfones bearing quaternary carbon stereocenters with moderate to excellent yields and up to 96:4 er. The advantage and irreplaceability of this sulfur dioxide insertion catalytic system have been demonstrated by achieving transformations clearly unavailable with the previously reported sulfonyl chloride system. Additionally,the recoverability of the new-developed bisoxazoline ligand L9 and its reusability without any erosion of the catalytic activity and enantioselectivity further demonstrate the usefulness of the protocol.

关键词： β-chiral sulfones sulfur dioxide insertion oxysulfonylation copper catalysis enantioselectivity

Concept, configuration, and application of on-board nanogrids for use in electric vehicles

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Science China(Technological Sciences) 2024年第7期67卷 2053-2073页

作者： ZHAO Bing li Yong wu fang WAN JiangHu CAI JiuQing YANG HaiTao liU fang College of Electrical and Information Engineering Hunan UniversityChangsha 410082China wuhan Second Ship Design and Research Institute Wuhan 430000China School of Automation Central South UniversityChangsha 410083China

Against the backdrop of increasingly serious climate change, researchers are attempting to extend macroscale carbon reduction research to smaller scales. With the rapid development and widespread application of electric vehicles(EVs), an effective approach for carbon reduction based on EVs has the potential to be developed. To coordinate and manage the EV platform in diverse application scenarios, the concept of an on-board nanogrid(OBNG), in which a nanogrid is combined with the EV, is proposed and defined, and the characteristics summarized. A configuration that includes a physical layer with the on-board hardware system;an information layer for logical control, energy management, and communication coordination;and an application layer that can cope with different working environments is proposed. A detailed introduction to the basic architecture and management mode of each layer is provided along with information concerning the relevant technologies for coordinated operation. New ideas and approaches to improve the existing performance are proposed, and finally, combined with a background of smart and low-carbon cities, major application scenarios are envisioned.

关键词： electric vehicle nanogrid energy management hybrid energy storage power electronics converter