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39th IEEE International Conference on Data Engineering, ICDE 2023

作者： Qiu, Rui Ming, Yi Hong, Yisen Li, Haoyu Yang, Tong Peking University School of Computer Science National Engineering Laboratory for Big Data Analysis Technology and Application Beijing China Peking University Academy for Advanced Interdisciplinary Studies China Peng Cheng Laboratory Shenzhen China

ISBN: (纸本)9798350322279

Graphs are good at presenting relational and structural information, making it powerful in the representation of various data. For the efficient storage and processing of graph-like data, graph databases have been rapidly developed and extensively studied. However, graph databases mostly use adjacency lists as their basic data structure (e.g., Neo4j), which could result in poor performance of edge due to the skewed degree distribution of *** design the Wind-Bell Index to address this problem. Wind-Bell Index is a memory-efficient index data structure, which can be attached to existing graph databases to speed up the edge. We have fully implemented our data structure in Neo4j, the most popular graph database today, and conduct theoretical and experimental analysis to evaluate the performance. Theoretical results prove the high query efficiency of our algorithm. And experimental results show that the average edge query speed is increased by hundreds of times compared with the original query interface of Neo4j. We believe that the excellent performance and scalability of Wind-Bell Index make it suitable for the application in a variety of graph databases. © 2023 IEEE.

关键词： Graph Databases

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Super-cavitation contour extraction method based on multi-scale space

Super-cavitation contour extraction method based on multi-sc...

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2022 International Conference on Optical and Photonic Engineering, icOPEN 2022

作者： Kong, Xiaofang Yang, Wenguang Chen, Xueqi Wan, Minjie Li, Baoming National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China School of Electronic and Optical Engineering Nanjing University of Science and Technology Nanjing210094 China Jiangsu Key Laboratory of Spectral Imaging and Intelligent Sense Nanjing University of Science and Technology Nanjing210094 China China Academy of Ordnance Science Beijing100089 China

ISBN: (纸本)9781510661905

Super-cavitation morphological parameter information of the cross-media projectile reflects high-speed projectiles motion characteristics. Accurate measurement of super-cavitation morphological parameters is the basis for high-speed projectile structural design and optimization, becoming a research hotspot of the underwater ballistic testing field. With the development of the high-speed photography technology, recording the evolution process of projectile cavitation morphologies by high-speed cameras and acquiring super-cavitation morphological information through image processing methods have become one of the main research directions. Aiming at reducing the large workload of manual interpretation from super-cavitation images, a multi-scale space-based automatic contour extraction algorithm for supercavitation images captured by the array cross-media high-speed imaging system is introduced in this paper. The Canny edge detection method is applied to obtain the binary edge image with coarse extraction super-cavitation edge after image pre-processing. The super-cavitation contour point set is searched in the binary edge image and small gaps between adjacent endpoints are filled at the same time. The contour extraction algorithm based on the multi-space curvature characteristics is presented to calculate the curvature value of each contour point in the high-scale space, and the curvature feature points are determined by the threshold judgment approach. The contour feature points extracted in the high-scale space are located in the low-scale space precisely, and the super-cavitation contour is extracted. Experimental results show that, the proposed method can reduce the workload from manual interpretation while improve the accuracy of contour positioning, which can provide basic data support for the cross-media high-speed projectile super-cavitation morphological parameter measurement. © 2022 SPIE.

关键词： High speed cameras

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Kevlar 49 yarn pull-out test and numerical analysis 8

Kevlar 49 yarn pull-out test and numerical analysis

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2022 8th Asia Conference on Mechanical Engineering and Aerospace Engineering, MEAE 2022

作者： Hong, Xiang Lei, Zhenkun Ma, Yu Bai, Ruixiang Li, Weikang State Key Laboratory of Structural Analysis for Industrial Equipment Department of Engineering Mechanics Dalian University of Technology Dalian116024 China State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing100081 China Beijing Institute of Technology Chongqing Innovation Center Chongqing China

The yarn pull-out tests are of great importance to study the frictional energy dissipation mechanism between yarns and the overall deformation behavior of fabrics. In this study, the stress transfer mechanism of the yarn pull-out process of Kevlar 49 woven fabric is investigated by the digital image correlation (DIC) marker method, considering both the warp waves and transverse preload variables, and have analyzed the shear deformation behavior of textile by the change history of fabric shear angle. The results show that the peak load of the yarn pull-out process increases nonlinearly with the increase of the transverse preload force and the number of warp waves, the maximum pull-out displacement of the yarn is sensitive to the preload force only and is largely independent of warp waves. Finally, the finite element (FE) calculation of the single yarn pull-out process was carried out by using the mixed element method with the restart analysis technique, and the numerical simulation results achieved a good match with the peak load of the experimental data. © Published under licence by IOP Publishing Ltd.

关键词： Yarn

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A Review of Document-Level Multi-Event Extraction Methods 9

A Review of Document-Level Multi-Event Extraction Methods

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9th International Conference on Big Data and Information Analytics, BigDIA 2023

作者： Ding, Guangshuai Tao, Jingjing Zhu, Xiaomin Lin, Bin Zhang, Wen Ye, Yanqing Academy of Military Science Strategic Assessments and Consultation Institute Beijing China National University of Defense Technology State Key Laboratory of High Performance Changsha China

ISBN: (纸本)9798350330076

This paper presents a comprehensive review of the prominent methods and techniques employed in the field of document-level multi-event extraction, while also providing a critical evaluation of the associated research. The initial section of this paper introduces the fundamental concepts of document-level multi-event event extraction, including the definition and challenges of event extraction, as well as the specific obstacles encountered in document-level multi-event event extraction. Subsequently, the paper conducts a thorough review of the principal methods used for event extraction, along with an analysis of their applicability to different scenarios and the problems they addressed. Furthermore, the paper offers a detailed exposition and summary of key issues such as thesis element scattering in document-level event extraction, in addition to discussing the prevailing research paradigms in this domain. Lastly, the paper concludes by summarizing the strengths and weaknesses of current research efforts by highlighting the future directions and potential of document-level multi-event extraction research. To summarize, the objective of this paper is to furnish researchers with a thorough and methodical review of document-level multi-event extraction methods, facilitating readers in attaining a more profound comprehension of the most recent advancements and methodologies in this domain. © 2023 IEEE.

关键词： Deep learning

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Variability of Young Stellar Objects in the Perseus Molecular Cloud

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Research in Astronomy and Astrophysics 2023年第7期23卷 174-196页

作者： Xiao-Long Wang Min Fang Gregory J.Herczeg Yu Gao Hai-Jun Tian Xing-Yu Zhou Hong-Xin Zhang Xue-Peng Chen Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China University of Chinese Academy of Sciences Beijing 100049China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Department of Astronomy Peking UniversityBeijing 100871China Department of Astronomy Xiamen UniversityXiamen 361005China School of Science Hangzhou Dianzi UniversityHangzhou 310018China Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China

We present an analysis of 288 young stellar objects(YSOs)in the Perseus molecular cloud that have well defined g and r-band lightcurves from the Zwicky Transient *** the 288 YSOs,238 sources(83%of our working sample)are identified as variables based on the normalized peak-to-peak variability metric,with variability fraction of 92%for stars with disks and 77%for the diskless *** variables are classified into different categories using the quasiperiodicity(Q)and flux asymmetry(M)***-three variables are classified as strictly periodic objects that are well phased and can be attributed to spot modulated stellar *** also identify 22 bursters and 25 dippers,which can be attributed to accretion burst and variable extinction,*** with disks tend to have asymmetric and non-repeatable lightcurves,while the YSOs without disks tend to have(quasi)periodic *** periodic variables have the steepest change in g versus g-r,while bursters have much flatter changes than dippers in g versus *** and quasiperiodic variables display the lowest variability *** models suggest that the variability amplitudes of periodic variables correspond to changes of the spot coverage of 30%-40%,burster variables are attributed to accretion luminosity changes in the range of L_(acc)/L_(*)=0.1-0.3,and dippers are due to variable extinction with A_(V)changes in the range of 0.5-1.3 mag.

关键词： stars:variables:general stars:late-type stars:emission-line Be (stars:)starspots accretion accretion disks

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Functional analysis of flavanone 3-hydroxylase(F3H)from Dendrobium officinale,which confers abiotic stress tolerance

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Horticultural Plant Journal 2023年第2期9卷 356-364页

作者： Can Si Wei Dong Jaime A.Teixeira da Silva Chunmei He Zhenming Yu Mingze Zhang Lei Huang Conghui Zhao Danqi Zeng Chuanmao Li Shengxiang Qiu Jun Duan Key laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement&Guangdong Provincial Key laboratory of Applied BotanySouth China Botanical GardenChinese Academy of SciencesGuangzhouGuangdong 510650China University of Chinese Academy of Sciences Beijing 100049China College of Life Science and Technology Xi An Jiao Tong UniversityXi’anShaanxi 710049China Independent Researcher Miki-choKagawa-kenJapan Guangzhou Keneng Cosmetic Scientific Research Co. LtdGuanghzouGuangdong 510650China

Flavonoids are important bioactive components in Dendrobium officinale,a medicinal *** are involved in many biological activities,including protecting plants against biotic and abiotic *** on the key genes related to flavonoid biosynthesis in *** is *** this study,one of the key flavonoid biosynthesis genes,flavanone 3-hydroxylase(F3H),was characterized from *** open reading frame of DoF3H was 1134 bp long and it encoded a 377-amino acid *** DoF3H protein showed considerably high homology with F3H proteins from other plant species and shared a common evolutionary ancestor with other ***3H transcripts were detected in different organs of adult plants and mainly accumulated in flowers,followed by roots,stems and leaves,a pattern that was similar to the content of *** DoF3H protein,which was localized in the cytosol,could convert naringenin to *** mRNA levels of DoF3H were significantly induced by salt and cold ***,the heterologous expression of DoF3H in Escherichia coli conferred it higher tolerance to salt and cold *** results provide insight into the molecular function of DoF3H in the biosynthesis of flavonoids,and provide a new application for improvement of abiotic tolerance in ***.

关键词： Dendrobium officinale Flavanone 3-hydroxylase Dihydrokaempferol Salt stress Cold stress

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Effects of high hydrostatic pressure treatment on bacterial composition in donkey milk studied by high throughput sequencing

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Food Innovation and Advances 2023年第2期2卷 85-94页

作者： Jiaqi Kong Wahafu Luoyizha Liang Zhao Congcong Fan Hehe Li Hui Li College of Food Science&Nutritional Engineering National Engineering Research Center for Fruit and Vegetable ProcessingChina Agricultural UniversityBeijing 100083PR China Beijing Laboratory of Food Quality and Safety Beijing Technology and Business UniversityBeijing 100048PR China Institute of Quality Standard&Testing Technology for Agro-Products Chinese Academy of Agricultural SciencesBeijing 100081PR China College of Life Science and Technology Xinjiang UniversityXinjiang 830046PR China

High hydrostatic pressure has become a non-thermal alternative to thermal pasteurization in dairy product *** this study,we investigated the effects of the treatment of high hydrostatic pressure on the bacterial composition in donkey milk using high-throughput sequencing technology and culture-dependent *** with the microbial composition in the untreated donkey milk,the relative percentage of Pseudomonas and Acinetobacter in donkey milk after high hydrostatic pressure was significantly decreased by 4.92%and 4.82%,*** diversity analysis demonstrated that the treatment of high hydrostatic pressure affected the microbial composition in donkey milk *** potential probiotic Enterococcus casseliflavus isolated from the untreated donkey milk has a good acidifying *** study revealed the effects of high hydrostatic pressure treatment on the microbial composition in donkey milk,exhibiting its practical industrial application and the potential use of biological resources in the future.

关键词： hydrostatic treatment methods.

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A new chloro-azaphilone derivative with pro-angiogenesis activity from the hadal trench-derived fungus Chaetomium globosum YP-106

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Journal of Oceanology and Limnology 2023年第3期41卷 1145-1151页

作者： Yaqin FAN Chunjiao JIANG Peihai LI Cong WANG Hao CHEN MNR Key Laboratory of Marine Eco-Environmental Science and Technology First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China Shandong Provincial Key Laboratory of Applied Mycology School of Life SciencesQingdao Agricultural UniversityQingdao 266109China Engineering Research Center of Zebrafish Models for Human Diseases and Drug Screening of Shandong Province Shandong Provincial Engineering Laboratory for Biological Testing TechnologyKey Laboratory for Biosensor of Shandong ProvinceBiology InstituteQilu University of Technology(Shandong Academy of Sciences)Jinan 250103China Key Laboratory of Chemistry and Engineering of Forest Producer State Ethnic Affairs CommissionGuangxi Key Laboratory of Chemistry and Engineering of Forest ProductsGuangxi Collaborative Innovation Center for Chemistry and Engineering of Forest ProductsSchool of Chemistry and Chemical EngineeringGuangxi Minzu UniversityNanning 53006China

A new chloro-azaphilone derivative chaetoviridin L(1)along with four known analogues,namely,chaetomugilin A(2),chaetoviridin E(3),chaetomugilin O(4),and chaephilone D(5),is isolated and identified from the culture extract of Chaetomium globosum YP-106,a deep-sea derived fungus obtained from the hadal zone seawater collected in the Yap *** structures were determined based on detailed interpretation of nuclear magnetic resonance(NMR)spectroscopic,mass spectrometry(MS)data analysis and comparison with the reported *** absolute configuration of the new compound was established by quantum chemical calculations of electronic circular dichroism(ECD).All the isolated compounds were evaluated for pro-angiogenesis activity using zebra fish *** 1,2,and 5significantly promoted the angiogenesis in a dose-dependent manner and thus,these compounds might be used as promising molecules for the treatment of cardiovascular disease.

关键词： marine natural products marine-keyword:marine nabta globosum pro-angjogo nesis activity

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Screening for lipophilic marine toxins and their potential producers in coastal waters of Weihai in autumn,2020

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Journal of Oceanology and Limnology 2022年第6期40卷 2218-2230页

作者： Huixia GENG Hongxiao SUN Chao LIU Fanzhou KONG Qingchun ZHANG Tian YAN Rencheng YU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Lipophilic marine toxins(LMTs)produced by some microalgae in the sea could accumulate in shellfish and pose potential threats to the health of seafood *** and shellfish samples were collected from coastal waters of Weihai in Shandong Peninsula,China in autumn,2020,and screened for lipophilic marine toxins and their potential producers using liquid chromatography-tandem mass spectrometry(LC-MS/MS)analysis and high throughput sequencing of partial DNA(V4 region of the 18S rRNA gene)extracted from ***-2(PTX2),trace amounts of azaspiracid(AZA1 or AZA40),and 13-desmethyl spirolide C(13-DesMe-C)were detected in phytoplankton samples,while PTX2 and gymnodimine(GYM)were detected in shellfish *** toxin content in shellfish samples was much lower than the regulatory limit or values reported *** suggest that lipophilic marine toxins should have low risk in coastal waters of Weihai in *** on the data of high throughput sequencing,the OTUs were assigned to 5 identified species of Alexandrium,including *** capable of producing 13-DesMe-C and *** OTUs were found closely related to the toxic species in genus Dinophysis,but it is impossible to assign them to any identified species due to the low resolving power of the V4 region for *** OTUs could not be assigned to any identified species in the genus Azadinium,suggesting the existence of unidentified species in this region.

关键词： harmful algal blooms phytoplankton shellfish lipophilic marine toxins(LMTs) Yellow Sea liquid chromatography-tandem mass spectrometry

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Microsatellite marker development and population genetic analysis revealed high connectivity between populations of a periwinkle Littoraria sinensis(Philippi,1847)

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Journal of Oceanology and Limnology 2022年第3期40卷 1097-1109页

作者： Mengyu LI Yuqiang LI Tengfei XING Yulong LI Jinxian LIU CAS Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

Periwinkle Littoraria sinensis is a widely distributed gastropod in rocky intertidal zone of the northwestern Pacifi *** examine genetic diversity and genetic connectivity among coastal populations of *** in China,1636 pairs of primers were successfully designed using whole-genome shotgun sequencing,de novo assembly,and a bioinformatics pipeline *** highly variable polymorphic markers were selected to genotype 351 individuals from 15 *** of nine microsatellite loci were retained for population genetic analysis,and weak genetic differentiation among populations were detected,suggesting high gene flow among *** long planktonic larval duration of *** might have played an important role in the high gene flow among populations.A tendency of genetic differentiation between north and south populations of *** was detected,which might be resulted from isolation due to lowered sea level in the last glacial ***,the newly founded populations along the coast of Jiangsu Province were closely related to populations to the south of the Changjiang(Yangtze)River estuary,suggesting that the main source of the newly founded populations is from natural rocky populations south of the estuary.

关键词： population genetics Littoraria sinensis gastropod simple-sequence repeats

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