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Fine-Grained Action Recognition Based on Temporal Pyramid Excitation Network

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Intelligent Automation & Soft Computing 2023年第8期37卷 2103-2116页

作者： xuan Zhou Jianping yi School of Mechanical&Electrical Engineering Xi’an Traffic Engineering InstituteXi’an710300China School of Electronics and Information Xi’an Polytechnic UniversityXi’an710048China

Mining more discriminative temporal features to enrich temporal context representation is considered the key to fine-grained action *** action recognition methods utilize a fixed spatiotemporal window to learn local video ***,these methods failed to capture complex motion patterns due to their limited receptive *** solve the above problems,this paper proposes a lightweight Temporal Pyramid Excitation(TPE)module to capture the short,medium,and long-term temporal *** this method,Temporal Pyramid(TP)module can effectively expand the temporal receptive field of the network by using the multi-temporal kernel decomposition without significantly increasing the computational *** addition,the Multi Excitation module can emphasize temporal importance to enhance the temporal feature representation *** can be integrated into ResNet50,and building a compact video learning *** validation experiments on several challenging benchmark(Something-Something V1,Something-Something V2,UCF-101,and HMDB51)datasets demonstrate that our method achieves a preferable balance between computation and accuracy.

关键词： Fine-grained action recognition temporal pyramid excitation module temporal receptive multi-excitation module

Epidemic risks of measles and rubella in China:a systematic review and meta-analysis

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World Journal of Pediatrics 2024年第12期20卷 1223-1239页

作者： yi-Tong Lin yi-xuan Gao Yan Zhang Ai-Li Cui Hui-Ling Wang Zhen Zhu Nai-ying mao National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases(NITFID) NHC Key Laboratory of Medical Virology and Viral DiseasesNational Institute for Viral Disease Control and PreventionWHO WPRO Regional Reference Measles/Rubella LaboratoryChinese Centre for Disease Control and PreventionNo.155 Changbai RoadChangping DistrictBeijingChina

BackgroundSeroprevalence studies across various countries can contribute to achieving the elimination target for measles and ***,in the Mainland of China,the concept of herd immunity remains unclear due to the lack of a nationwide *** systematic review and meta-analysis was conducted by retrieving literature reporting the seroprevalence of measles and rubella published between 2012 and *** pooled positive rates and estimated geometric mean concentrations(GMCs)of measles and rubella immunoglobulin G antibodies were *** study analysed 135 studies on measles and 77 on rubella,including data from 368,023 and 177,422 healthy individuals,*** 2010 and 2022,the overall pooled positive rates for measles and rubella antibodies were 88.8%and 79.91%,*** age-specific susceptibility analysis showed that infants aged<1 year had the lowest pooled positive *** age groups had a roughly U-shaped distribution,with relatively higher positive rates and GMC of measles and rubella antibodies in young children and older age ***,the positive rates for both measles and rubella antibodies fell below the elimination threshold in almost all age groups other than young children aged 1–4 years,especially in recent *** addition,antibody positivity rates varied by geographical region and decreased with economic *** findings provide preliminary insights into herd immunity for measles and rubella,highlighting the challenges to achieving their elimination in China.

关键词： Elimination Measles Meta-analysis Rubella Seroprevalence

Dynamic development of microglia and macrophages after spinal cord injury

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Neural Regeneration Research 2025年第12期20卷 3606-3619页

作者： Hu-Yao Zhou Xia Wang yi Li Duan Wang xuan-Zi Zhou Nong Xiao Guo-Xing Li Gang Li Institute of Life Sciences Chongqing Medical UniversityChongqingChina Department of Rehabilitation Children’s Hospital of Chongqing Medical UniversityNational Clinical Research Center for Child Health and DisordersMinistry of Education Key Laboratory of Child Development and DisordersChongqing Key Laboratory of Translational Medical Research in Cognitive Development and Learning and Memory DisordersChongqingChina Molecular Medicine Diagnostic and Testing Center Chongqing Medical UniversityChongqingChina

Secondary injury following spinal cord injury is primarily characterized by a complex inflammatory response,with resident microglia and infiltrating macrophages playing pivotal *** previous studies have grouped these two cell types together based on similarities in structure and function,an increasing number of studies have demonstrated that microglia and macrophages exhibit differences in structure and function and have different effects on disease *** this study,we used single-cell RNA sequencing and spatial transcriptomics to identify the distinct evolutionary paths of microglia and macrophages following spinal cord *** results showed that microglia were activated to a pro-inflammatory phenotype immediately after spinal cord injury,gradually transforming to an anti-inflammatory steady state phenotype as the disease *** macrophages,our findings highlighted abundant communication with other cells,including fibroblasts and *** pro-inflammatory and neuroprotective effects of macrophages were also identified;the pro-inflammatory effect may be related to integrin β2(Itgb2) and the neuroprotective effect may be related to the oncostatin M *** findings were validated by in vivo *** research underscores differences in the cellular dynamics of microglia and macrophages following spinal cord injury,and may offer new perspectives on inflammatory mechanisms and potential therapeutic targets.

关键词： acute inflammation bioinformatics analysis fibroblast integrinβ2 ligand-receptor interaction neuroinflammation oncostatin M single-cell RNA sequencing spatial transcriptomics spinal cord injury

N6-腺苷酸甲基化和铁死亡在儿童变应性鼻炎-哮喘综合征中的研究进展

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中国当代儿科杂志 2025年第2期27卷 242-247页

作者：李婧怡李昱剑赖晟琳(综述) 阚璇(审校) 天津医科大学总医院儿科天津300052 天津医科大学公共卫生学院天津300000

变应性鼻炎-哮喘综合征(combined allergic rhinitis and asthma syndrome,CARAS)是儿童时期常见的慢性气道炎症性疾病之一。随着表观遗传学的发展,对CARAS的研究逐渐从蛋白质层面延伸至转录、转录后调控等微观层面。N6-腺苷酸甲基化(N6... 详细信息

变应性鼻炎-哮喘综合征(combined allergic rhinitis and asthma syndrome,CARAS)是儿童时期常见的慢性气道炎症性疾病之一。随着表观遗传学的发展,对CARAS的研究逐渐从蛋白质层面延伸至转录、转录后调控等微观层面。N6-腺苷酸甲基化(N6-methyladenosine,m6A)和铁死亡(ferroptosis)作为近年来十分有研究前景的热点,在肿瘤、生长发育、变应性疾病等方面均发挥着关键作用。该文旨在总结m6A和铁死亡的特点,以及它们在儿童CARAS的发生发展中的作用,从而为儿童CARAS的诊治提供新的思路和策略。

关键词：变应性鼻炎-哮喘综合征 N6-腺苷酸甲基化铁死亡变应性鼻炎变应性哮喘儿童

Role of in-situ formed free carbon on electromagnetic absorption properties of polymer-derived SiC ceramics

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Journal of Advanced Ceramics 2020年第5期9卷 617-628页

作者： Zhaoju YU xuan LV Kangwei mao Yujing YANG Anhua LIU College of Materials Key Laboratory of High Performance Ceramic Fibers(Xiamen University)Ministry of EducationXiamen 361005China College of Materials Fujian Key Laboratory of Advanced Materials(Xiamen University)Xiamen 361005China Shenzhen Research Institute of Xiamen University Shenzhen 518000China

In order to enhance dielectric properties of polymer-derived SiC ceramics,a novel single-source-precursor was synthesized by the reaction of an allylhydrido polycarbosilane(AHPCS)and divinyl benzene(DVB)to form carbon-rich *** expected,the free carbon contents of resultant SiC ceramics annealed at 1600℃are significantly enhanced from 6.62 wt%to 44.67 wt%.After annealing at 900-1600℃,the obtained carbon-rich SiC ceramics undergo phase separation from amorphous to crystalline feature where superfine SiC nanocrystals and turbostratic carbon networks are dispersed in an amorphous SiC(O)*** dielectric properties and electromagnetic(EM)absorption performance of as-synthesized carbon-rich SiC ceramics are significantly improved by increasing the structural order and content of free *** the 1600℃ ceramics mixed with paraffin wax,the minimum reflection coefficient(RCmin)reaches-56.8 dB at 15.2 GHz with the thickness of 1.51 mm and a relatively broad effective bandwidth(the bandwidth of RC values lower than-10 dB)of 4.43 GHz,indicating the excellent EM absorption *** carbon-rich SiC ceramics have to be considered as harsh environmental EM absorbers with excellent chemical stability,high temperature,and oxidation and corrosion resistance.

关键词： polymer-derived ceramics(PDCs) microstructural evolution dielectric properties electromagnetic properties

Rectangle Attack Against Type-I Generalized Feistel Structures

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Chinese Journal of Electronics 2022年第4期31卷 713-720页

作者： ZHANG yi LIU Guoqiang SHEN xuan LI Chao College of Liberal Arts and Sciences National University of Defense Technology Hunan Engineering Research Center of Commercial Cryptography Theory and Technology Innovation State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences College of Information and Communication National University of Defense Technology

Type-I generalized Feistel networks(GFN) are widely used frameworks in symmetric-key primitive designs such as CAST-256 and Lesamnta. Different from the extensive studies focusing on specific block cipher instances, the analysis against Type-I GFN structures gives generic security evaluation of the basic frameworks and concentrates more on the effect of linear transformation. Currently, works in this field mainly evaluate the security against impossible differential attack,zero-correlation linear attack, meet-in-the-middle attack and yoyo game attack, while its security evaluation against rectangle attack is still missing. In this paper, we filled this gap and gave the first structural analytical results of Type-I GFN against rectangle attack. By exploiting its structural properties, we proved there exists a boomerang switch for Type-I GFN for the first time,which is independent of the round functions. Then we turned the boomerang switch into chosen plaintext setting and proposed a new rectangle attack model. By appending 1 more round in the beginning of the boomerang switch, we constructed a rectangle distinguisher and a key recovery attack could be performed.

关键词： Block cipher structures Rectangle attack Boomerang switch Structural attack Generalized Feistel networks

南岭国家公园(拟建)多层级生态廊道体系构建

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风景园林 2025年第2期32卷 43-53页

作者：邓毅黄泽宇毛子一黄金玲广州大学建筑与城市规划学院广州大学国家公园研究中心广州新华学院资源与城乡规划系

【目的】探索适应未来环境变化、耦合生态系统层级结构、实行差异化建设管控的国家公园生态廊道体系,有助于缓解生境破碎化、强化国家公园功能。【方法】以拟建南岭国家公园为例,依据生态系统服务功能重要性,识别区域层级生态源地;结合... 详细信息

【目的】探索适应未来环境变化、耦合生态系统层级结构、实行差异化建设管控的国家公园生态廊道体系,有助于缓解生境破碎化、强化国家公园功能。【方法】以拟建南岭国家公园为例,依据生态系统服务功能重要性,识别区域层级生态源地;结合气候与相关规划模拟未来情景,采用MaxEnt模型进行生境适宜性评价,识别园区层级生态源地。在各层级阻力面的基础上采用电路理论模型提取生态廊道,再基于地理探测器识别源地的生态本底特征,从而确定廊道宽度与生态踏脚石,并通过踏脚石进行层级嵌套。最终依据生态本底特征进行景观异质性分析,制定差异化建设管控内容。【结果】在南岭国家公园生态廊道体系中,分别构建区域与园区2个层级的生态廊道990条、154条,将13个生态踏脚石与52条区域层级生态廊道进行层级嵌套连接。将园区层级生态廊道划分为三大类建设管控分区,以林业小班为空间单元制定了12小类差异化建设管控内容。【结论】多层级生态廊道体系的建立,提高了廊道对未来环境变化的适应性,增强了国家公园园区内部生境的连通性及园区与更大尺度区域的连通性,可有效支撑生态廊道的建设与实施,增强了国家公园在自然保护地体系中的主体支撑作用。

关键词：国家公园生态廊道建设管控分区未来情景模拟生境适宜性生态系统服务功能多层级

压缩空气储能电站地下内衬硐库基本原理与分析方法研究进展

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岩土力学 2025年第1期46卷 1-25页

作者：孙冠华王娇于显杨易琪朱开源王章星耿璇屈杰中国科学院武汉岩土力学研究所岩土力学与工程安全重点实验室湖北武汉430071 中国科学院大学北京100049

地下内衬硐库的压缩空气储能,以其发电时间长、规模大、建设周期短、选址灵活、工程造价低、运行周期长、环境友好等优势,在新型储能领域展现了较强的生命力,将有力地促进新型电力系统的构建和新能源的高质量发展。与传统地下空间的运... 详细信息

地下内衬硐库的压缩空气储能,以其发电时间长、规模大、建设周期短、选址灵活、工程造价低、运行周期长、环境友好等优势,在新型储能领域展现了较强的生命力,将有力地促进新型电力系统的构建和新能源的高质量发展。与传统地下空间的运行特点有较大不同,在充放气过程中,储备有压缩空气的地下内衬硐库不仅需要承受交变高内压膨胀压力,同时伴随着显著的温度变化。围绕地下内衬硐库,阐述了其工作原理以及柔性密封结构的设计理念,针对高压、交变应力和温度变化等荷载特征,系统分析了地下内衬硐库相关理论与分析方法等方面的研究进展,主要包括库内温压响应与密封结构传热特性、围岩应力路径与力学响应、钢筋混凝土衬砌开裂与控制标准、上覆岩体稳定性与安全埋深、密封层及密封堵头等,并对地下内衬硐库基本原理与分析方法的发展趋势进行了展望。

关键词：压缩空气储能岩石内衬硐库分析方法

采用电阻加热工艺的复合材料二次胶接接头的拉伸剪切性能

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中国机械工程 2025年第1期36卷 152-159页

作者：王轩姚凯飞原伟强王魁奎于吉选张毅中国民航大学航空工程学院天津300300 航空工业济南特种结构研究所民机中心山东济南250023 天津爱思达航天科技有限公司天津300304

通过试验研究了5种嵌入物对热固性复合材料二次胶接接头拉伸剪切性能的影响。试验结果显示:金属网嵌入物须进行表面处理才能提高胶接质量;电阻加热工艺制备的接头拉剪强度优于热压罐工艺;嵌入物可提高接头的拉伸剪切性能,碳纤维预浸料... 详细信息

通过试验研究了5种嵌入物对热固性复合材料二次胶接接头拉伸剪切性能的影响。试验结果显示:金属网嵌入物须进行表面处理才能提高胶接质量;电阻加热工艺制备的接头拉剪强度优于热压罐工艺;嵌入物可提高接头的拉伸剪切性能,碳纤维预浸料嵌入物的接头拉伸剪切性能最好;镍网嵌入物致密度高,对应的胶接质量优于铜网嵌入物;接头搭接区域端部存在严重的应力集中;金属网嵌入物提高了接头拉伸刚度;嵌入物接头呈现内聚破坏、黏附破坏、被胶接件纤维撕裂破坏、嵌入物破坏,剥离应力在破坏中起主要作用;断面破坏模式分布区域越不规则,胶接质量越差。

关键词：电阻加热二次胶接复合材料拉伸剪切性能