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轻量化YOLOv7-tiny的遥感图像小目标检测

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科学技术与工程 2024年第18期24卷 7726-7732页

作者：桑雨李立权李铁辽宁工程技术大学电子与信息工程学院葫芦岛125105

针对遥感图像小目标众多、目标检测器参数量大和检测效率低等问题,提出了一种改进的YOLOv7-tiny的轻量级遥感图像小目标检测模型。首先,针对原始模型中跨阶段局部空间金字塔池化网络复杂的碎片化操作,提出轻量级的空间金字塔池化结构来... 详细信息

针对遥感图像小目标众多、目标检测器参数量大和检测效率低等问题,提出了一种改进的YOLOv7-tiny的轻量级遥感图像小目标检测模型。首先,针对原始模型中跨阶段局部空间金字塔池化网络复杂的碎片化操作,提出轻量级的空间金字塔池化结构来减少多余的卷积算子操作;其次,针对颈部网络冗余的模块化连接方式和小目标容易在深层特征丢失空间信息的问题,提出深层语义信息引导的单尺度预测头方法来进行小目标位置信息强化,并进一步减少颈部网络和头部网络的计算成本。在遥感图像数据集上展开实验,结果表明,改进后的模型比原始模型参数量降低49.6%,计算复杂度降低28.5%,推理速度提高73.1%,并优于现阶段其他主流轻量级目标检测器。

关键词：目标检测 YOLOv7-tiny 轻量化遥感图像语义信息引导

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社会工作在脱贫成果巩固中的动员势能研究

山东行政学院学报 2024年第4期 51-60页

作者：李全利任欢广西师范大学政治与公共管理学院广西桂林541006

巩固脱贫攻坚成果是一项系统性、复杂性的民生工程,不仅需要以政府和驻村干部为责任主体的行政权威型动员,还需要其他社会组织和专业社会工作者的嵌入协同型动员。社会工作在脱贫攻坚时期已经释放出独具特色的专业化联动嵌入优势,在巩... 详细信息

巩固脱贫攻坚成果是一项系统性、复杂性的民生工程,不仅需要以政府和驻村干部为责任主体的行政权威型动员,还需要其他社会组织和专业社会工作者的嵌入协同型动员。社会工作在脱贫攻坚时期已经释放出独具特色的专业化联动嵌入优势,在巩固拓展脱贫攻坚成果的社会动员实践中同样能够继续发挥其自身所具有的权威性价值、合理性价值、专业性价值和灵活性价值。在具体的社会动员政策实践中,社会工作可以通过政策动员、思想动员、组织动员和工具动员四种策略增强巩固拓展脱贫成果行动的动员规模和联动效应,从而有效释放基层治理社会动员势能,促进共同富裕目标实现。

关键词：巩固脱贫攻坚成果社会工作嵌入协同型社会动员动员势能

Phase transformation and thermal analysis during combustion synthesis of Mg_(17)Al_(12) alloy

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Rare Metals 2014年第1期33卷 37-40页

作者： Yu-li Zhou Yun Lu Yun-Feng Zhu li-quan li College of Materials Science and Engineering Nanjing University of Technology

The Mg-A1 hydrogen storage alloy was suc- cessfully prepared by combustion synthesis （CS） method. The formation of alloy phases during the CS process was studied using X-ray diffraction （XRD）, scanning electron microscope （SEM）, and differential scanning calorimetry （DSC）. When the time increases from 0, 0.5, 1.0 to 2.0 h at 733 K, the products are Mg and A1; Mg2A13, Mg and A1; Mgl7All2, Mg2A13; and Mg; and eventually only MgI7A112, respectively. Combined with three peaks in the DSC traces, it is concluded that the formation of MglyAll2 during the CS includes three processes, namely, the formation of MgzA13 first; then the unsaturated solid solution, MglvAla2; and finally the complete MglvA112 alloy. The formation of MgzA13 prior to MglvA112 in this work is different from those prepared by mechanical alloying. This is thought to be related to the instant high temperature during the ther- mal explosion of CS.

关键词： Mg-A1 alloy Combustion synthesis Phasetransformation Thermal analysis

先兆流产保胎治疗后不良妊娠结局发生的影响因素分析

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四川生理科学杂志 2024年第4期46卷 819-821页

作者：徐会齐王洪磊李权利鹤壁市妇幼保健院产科河南鹤壁458000

目的:探讨先兆流产患者保胎后不良妊娠结局的影响因素。方法:选取2020年7月至2023年2月本院收治的先兆流产患者96例为研究对象,均接受保胎治疗。依据治疗后妊娠结局情况分为良好组79例、不良组17例。分析比较两组临床资料。多因素Logis... 详细信息

目的:探讨先兆流产患者保胎后不良妊娠结局的影响因素。方法:选取2020年7月至2023年2月本院收治的先兆流产患者96例为研究对象,均接受保胎治疗。依据治疗后妊娠结局情况分为良好组79例、不良组17例。分析比较两组临床资料。多因素Logistic回归分析不良妊娠结局的影响因素。结果:孕产次数、流产次数、黄体功能不全、焦虑评分、宫内大血肿、尿完整型人绒毛膜促性腺激素(Intact human chorionic gonadotropin,I-HCG)/人绒毛膜促性腺激素相关蛋白(Human chorionic gonadotropin related protein,HCGRP)阳性2为不良妊娠结局的独立危险因素(P<0.05)。结论:孕产次数、流产次数、黄体功能不全、焦虑评分、宫内大血肿、尿I-HCG/HCGRP阳性2为先兆流产患者保胎后不良妊娠结局的高危因素。

关键词：先兆流产妊娠结局保胎治疗高危因素

Formation Mechanism and Binding Energy for Body-Centred Regular Octahedral Structure of li7 Cluster

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Communications in Theoretical Physics 2007年第4X期48卷 717-720页

作者： MA Hai-Rong li Ping GOU Qing-quan li Hui-li Institute of Atomic and Molecular Physics Sichuan University Chengdu 610065 China

The formation mechanism for the body-centred regular octahedral structure of li7 cluster is proposed. The curve of the total energy versus the separation R between the nucleus at the centre and nuclei at the apexes for this structure of li7 has been calculated by using the method of Gou＇s modified arrangement channel quantum mechanics （MACQM）. The result shows that the curve has a minimal energy of-52.169 73 a.u. at R = 5.06ao. When R approaches infinity, the total energy of seven lithium atoms has the value of-51.996 21 a.u. So the binding energy of li7 with respect to seven lithium atoms is 0.173 52 a.u. Therefore the binding energy per atom for li7 is 0.024 79 a.u. or 0.674 eV, which is greater than the binding energy per atom of 0.453 eV for li2, the binding energy per atom of 0.494 eV for li3 and the binding energy per atom of 0.632 eV for li5 calculated previously by us. This means that the li7 cluster may be formed stably in a body-centred regular octahedral structure with a greater binding energy.

关键词： li7 cluster formation mechanism binding energy

An enamel-inspired bioactive material with multiscale structure and antibacterial adhesion property

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Bioactive Materials 2022年第1期7卷 491-503页

作者： Hai Ming Wong Yu Yuan Zhang quan li li Paediatric Dentistry and Orthodontics Faculty of DentistryThe University of Hong Kong34 Hospital RoadHong Kong Collage and Hospital of Stomatology Anhui Medical UniversityNo.69Meishan RoadHeifeiChina

Conventional dental materials lack of the hierarchical architecture of enamel that exhibits excellent intrinsic-extrinsic mechanical ***,restorative failures frequently occur due to physical and chemical mismatch between artificial materials and native dental hard tissue followed by recurrent caries which is caused by sugar-fermenting,acidogenic bacteria invasion of the defective *** order to resolve the limitations of the conventional dental materials,the aim of this study was to establish a non-cell-based biomimetic strategy to fabricate a novel bioactive material with enamel-like structure and antibacterial adhesion *** evaporation-based,bottom-up and self-assembly method with layer-by-layer technique were used to form a large-area fluorapatite crystal layer containing antibacterial *** multilayered structure was constructed by hydrothermal growth of the fluorapatite crystal layer and highly conformal adsorption to the crystal surface of a polyelectrolyte matrix *** and mechanical assessment demonstrated that the synthesized bioactive material resembled the native enamel in chemical components,mechanical properties and crystallographic *** and cytocompatibility evaluation demonstrated that this material had the antibacterial adhesion property and *** combination with the molecular dynamics simulations to reveal the effects of variables on the crystallization mechanism,this study brings new prospects for the synthesis of enamel-inspired materials.

关键词： Biomimetic mineralization Enamel-inspired material Bioactive material Graphene oxide Enamel-like structure

Embryo-chondrocyte expressed gene 1,downregulating hypoxiainducible factor 1α,is another marker of lung tumor hypoxia

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Acta Pharmacologica Sinica 2007年第4期28卷 549-558页

作者： li ZHANG Qing-quan li Department of Respiratory Disease,Renmin Hospital,Wuhan University,Wuhan 430060,China Department of Respiratory Disease Renmin Hospital Wuhan University

Aim:To explore the mechanism of differentiated embryo-chondrocyte expressedgene 1 (DEC 1) in the lung adenocarcinoma A549 cell line and its relationship withhypoxia-inducible factor 1α(HIF-1α).Methods:DEC 1 and HIF-1α protein levelswere detected in lung adenocarcinoma tissues by immunohistochemistry.A549cells were cultured at *** assay was used to determine the effect of *** apoptotic analysis was determined by flow ***-PCR andimmunocytochemistry were carried out to observe the DEC 1 and HIF-1α mRNAand protein ***-1α mRNA and protein levels were detected in thestably transfected pcDNA-DEC 1+/-A549 cells by RT-PCR and Western ***1 mRNA and protein levels were detected in the stably transfected pcDNA-DEC 1+/-A549 cells with or without H1F-1α antisense oligonucleotide treatmentby RT-PCR and Western ***:DEC1 was specifically located in 40(48.8%) lung adenocarcinoma *** results of the MTT test showed thegrowth of the stably transfected pcDNA-DEC+ A549 cells was higher than thoseof A549 cells and the stably transfected pcDNA-DEC-A549 *** alsoinduced the apoptosis of A549 cells and the stably transfected pcDNA-DEC+/-A549 *** increased the mRNA and protein levels of DEC1 and HIF-1α.Both HIF-1α mRNA and protein levels decreased in the stably transfected pcDNA-DEC+cells,but HIF-1α antisense oligonucleotide had no effect on DEC1 in thestably transfected pcDNA-DEC+/-A549 ***:DEC 1 is a marker oftumor ***1 downregulates the HIF-1α at both mRNA and protein levelsat hypoxia in lung adenocarcinoma A549 cells.

关键词： DECI lung adenocarcinoma hypoxia HIF-1

Measurement of acceleration and angular velocity of particles during a 3D silo discharge

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Particuology 2024年第9期92卷 61-71页

作者： Tongtong Mu Yiming li quan Chen Ran li Hui Yang College of Medical Instrument Shanghai University of Medicine and Health SciencesShanghai201318China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai200093China

Accurate measurement of the three-dimensional(3D)movement of discrete particles is crucial for comprehending complex granular rheology in *** this paper,the acceleration and angular velocity of particles in 3D silos are measured by using a spherical detector based on inertial technology and magnetic positioning *** acceleration of particles is the largest in the center of silos,which suggest that the resistance generated by friction and extrusion is the ***,the angular velocity distribution follows lognormal function except for particles near the *** correlation between acceleration and angular velocity is opposite in different flow *** reveals for the first time that the extent to which the resultant force on the particles affects their rotational motion is related to the flow *** results have practical significance for regulating the granular flow pattern and optimizing the structural design of silos.

关键词： Granularflow Silo Angular velocity Acceleration

Controllable CPL response driven by achiral UV-photosensitive dichroic dye through cholesteric liquid crystals

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Science China Chemistry 2024年第4期67卷 1250-1255页

作者： Yihan Chen Yang li Hang li Lulu li Yiwu quan Yixiang Cheng State Key Laboratory of Analytical Chemistry for life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Key Laboratory of High-Performance Polymer Material and Technology of Ministry of Education School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Versatile stimuli-responsive circularly polarized luminescent(CPL)materials have potential applications in information storage,security encryption,and intelligent *** this study,the Z/E isomerization of ultraviolet(UV)-photosensitive achiralα-cyanostilbene derivative was used as an achiral dichroic dye(Switch)to drive the controllable CPL-active response in cholesteric liquid crystals(CLCs).Under irradiation by 365 nm UV light,the resulting CLCs-Z-Switch underwent a Z-to-E configuration isomerization as CLCs-E-Switch,accompanied by a decrease in its dichroic order parameter(SFvalue)from 0.15to *** the quantum yield(QY)of CLCs-E-Switch increased from 8.1%(CLCs-Z-Switch)to 16.8%,the corresponding glumvalues of CPL emission decreased from+0.55/-0.57 to+0.37/-0.39 due to a decrease in the order of helical arrangement of E-Switch in E7 *** study enables photosensitive CLCs-Switch to be applied for optical information storage devices.

关键词： circularly polarized luminescent photosensitive dichroic dye cholesteric liquid crystals chiral induction