检索结果-南通市图书馆

Temperature influence on minimum fluidization velocity:Complexity,mechanism,and solutions

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第5期88卷 344-349页

作者： Qingjin Zhang Liangliang fu Guangwen Xu Dingrong Bai Key Laboratory on Resources Chemicals and Material of Ministry of Education Shenyang University of Chemical TechnologyShenyang 110142China School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110142China School of Chemical Engineering University of Science and Technology LiaoningAnshan 114051China

Fluidized-bed reactors are widely employed in various high-temperature industrial ***,it is crucial to understand the temperature effect on various fluidization phenomena,specifically the minimum fluidization velocity(U_(mf))that governs various aspects of fluidized bed *** this study,we comprehensively analyze U_(mf) data from the literature to unravel the complexity and underlying mechanisms of temperature influence on this critical *** research examines experimental data encompassing a wide range of temperatures,pressures,and solid *** analysis reveals that the influence of temperature on U_(mf) is fundamentally determined by the relative importance of hydrodynamic forces and interparticle forces within fluidized beds and is realized by three distinctive temperature-induced changes:gas properties,bed voidage,and physiochemical characteristics of *** this basis,an equation is derived to enable predictions of temperature influences on the minimum fluidization velocity under broad temperature conditions.

关键词： High-temperature gas-solids fluidized beds Minimum fluidization velocity Hydrodynamic forces Interparticle forces Bed voidage

Noise‐tolerant matched filter scheme supplemented with neural dynamics algorithm for sea island extraction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2024年第4期9卷 996-1013页

作者： Yiyu Chen Dongyang fu Difeng Wang Haoen Huang Yang Si Shangfeng Du School of Electronics and Information Engineering Guangdong Ocean UniversityZhanjiangChina State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhouChina School of Artificial Intelligence and Automation Huazhong University of Science and TechnologyWuhanChina

Achieving high‐precision extraction of sea islands from high‐resolution satellite remote sensing images is crucial for effective resource development and sustainable ***,achieving such accuracy for sea island extraction presents significant challenges due to the presence of extensive background interference.A more widely applicable noise‐tolerant matched filter(NTmf)scheme is proposed for sea island extraction based on the mf *** NTmf scheme effectively suppresses the background interference,leading to more accurate and robust sea island *** further enhance the accuracy and robustness of the NTmf scheme,a neural dynamics algorithm is supplemented that adds an error integration feedback term to counter noise interference during internal computer operations in practical *** comparative experiments were conducted on various remote sensing images of sea islands under different noisy working conditions to demonstrate the superiority of the proposed neural dynamics algorithm‐assisted NTmf *** experiments confirm the ad-vantages of using the NTmf scheme for sea island extraction with the assistance of neural dynamics algorithm.

关键词： edge detection image classification image recognition shape extraction

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

可变形分支注意力融合网络的胰腺分割方法

小型微型计算机系统 2024年第11期45卷 2717-2724页

作者：付艳贞樊建聪山东科技大学计算机科学与工程学院山东青岛266590

胰腺具有尺寸小、形状不规则且多变的特点,因此在腹部CT图像中自动分割胰腺具有极大的挑战性.为了适应胰腺特征并解决其分割困难的问题,本文提出了一种轻量级的可变形分支注意力融合网络(Deformable Branch Attention fusion Network,DB... 详细信息

胰腺具有尺寸小、形状不规则且多变的特点,因此在腹部CT图像中自动分割胰腺具有极大的挑战性.为了适应胰腺特征并解决其分割困难的问题,本文提出了一种轻量级的可变形分支注意力融合网络(Deformable Branch Attention fusion Network,DBA-Net)作为胰腺自动分割方法.该方法首先将候选区域裁剪出来作为网络的输入,以便减少背景干扰并突出胰腺区域;然后引入可变形卷积使网络自适应地学习胰腺的空间结构;最后提出分支注意力融合模块实现低级别特征和高级别特征的融合,帮助解码器更好地还原特征图.本文的方法在NIH数据集上测试的Dice相似系数为85.3%,在MSD数据集上的Dice相似系数为78.9%,相比基线U-Net分别提高了3.9%和5.6%.实验结果表明本文的方法能够对胰腺进行更好的分割.

关键词：胰腺分割轻量级可变形卷积分支注意力融合模块

LD-identify:基于无源RFID的网络学习状态识别

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

控制与决策 2024年第1期39卷 219-226页

作者：王涛春邱庆王成田陈付龙安徽师范大学计算机与信息学院安徽芜湖241002 安徽师范大学安徽省医疗大数据智能系统工程研究中心安徽芜湖241002

在线教育中,学生实时动作能够准确反映学生当前的学习状态,在不影响学习注意力和保证个人隐私信息安全的情况下,准确识别学习动作是监测在线教育质量的关键要素.对此,提出一种基于无源RFID的网络学习动作识别系统LD-identify. LD-ident... 详细信息

在线教育中,学生实时动作能够准确反映学生当前的学习状态,在不影响学习注意力和保证个人隐私信息安全的情况下,准确识别学习动作是监测在线教育质量的关键要素.对此,提出一种基于无源RFID的网络学习动作识别系统LD-identify. LD-identify仅通过射频信号完成学生动作识别,所以识别系统可以很好地保护个人的隐私信息,且避免设备昂贵等一系列问题.通过提取相位和信号强度的有效特征和深度学习算法, LD-identify能够获得很好的识别准确率的性能.实验表明, LD-identify只需要在帽子的背面粘贴两个射频标签,就能很好地识别出抬头低头、左右摇头、前倾后倾3种动作.为了进一步验证系统性能,研究6名志愿者在不同的场景中的动作识别的准确率,实验结果显示LD-identify能够在不同的场景下很好地识别所有用户的3种动作,利用卷积神经网络构建分类模型来识别动作可以取得很好的识别率,识别准确率达到95.5%以上.

关键词：无线射频识别动作识别机器学习深度学习标签注意力机制

在线全文

学校读者我要写书评

暂无评论

健身行为的人体姿态估计及动作识别

液晶与显示 2024年第2期39卷 217-227页

作者：付惠琛高军伟车鲁阳青岛大学自动化学院山东青岛266071 山东省工业控制技术重点实验室山东青岛266071

人体姿态估计和动作识别在安防、医疗和运动等领域有着重要的应用价值。为了解决不同背景及角度下各类运动动作的人体姿态估计和动作识别问题,本文提出了一种改进的YOLOv7-POSE算法,并自行拍摄制作各种拍摄角度的数据集进行训练。此算法... 详细信息

人体姿态估计和动作识别在安防、医疗和运动等领域有着重要的应用价值。为了解决不同背景及角度下各类运动动作的人体姿态估计和动作识别问题,本文提出了一种改进的YOLOv7-POSE算法,并自行拍摄制作各种拍摄角度的数据集进行训练。此算法以YOLOv7为基础,对原始网络模型添加了分类的功能,在Backbone主干网络中引入CA卷积注意力机制,提升了网络在对人体骨骼关节点和动作的分类的重要特征的识别能力。用HorNet网络结构代替原模型的CBS卷积核,提高了模型的人体关键点检测精度和动作分类的准确度。将Head层的空间金字塔池化结构替换为空洞空间金字塔池化结构,提升了检测精度并且加快了模型收敛。将目标检测框的回归函数由CIOU替换为EIOU,提高了坐标回归的精度。设计了两组对照实验,实验结果证明,改进后的YOLOv7-POSE在验证集上的mAP为95.7%,相比于原始YOLOv7算法提高了4%,各类运动动作识别准确率显著上升,在实际推理中的关键点错检、漏检等情况明显减少,关键点位置估计误差明显降低。

关键词：图像处理关键点检测姿态估计注意力机制空洞空间金字塔池化

维普期刊数据库博看期刊

The affect of industrial activities on zinc in alluvial Egyptian soil determined using neutron activation analysis

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2002年第3期14卷 330-332页

作者： Abde.mf Abde.N SoilandWaterPollutionUnit NuclearResearchCenterCairoEgypt NuclearPhysicsLaboratory PhysicsDepartmentFacultyofGirlsAinShamsUniversityCairoEgypt.E－mail：mamsab@***

Thirty two surface (0—20 cm) soil samples were collected from different locations in Egypt representing non polluted, moderately and highly polluted soils. The aim of this study was to evaluate total Zn content in alluvial soils of Nile Delta in Egypt by using the delayed neutron activation analysis technique (DNAA), in the irradiation facilities of the first Egyptian research reactor (ET RR 1). The gamma ray spectra were recorded with a hyper pure germanium detection system. The well resolved gamma ray peak at 1116.0 keV was efficiently used for 65 Zn content determination. Zn content in non polluted soil samples ranged between 74.1 and 103.8 ppm with an average of 98.5±5.1 ppm. Zn content in moderately polluted soils ranged between 136.0 and 232.5 ppm with an average of 180.1±32.6 ppm. The highest Zn levels ranging from 240.0 and 733.0 ppm with an average of 410.3±54.4 ppm, were observed in soil samples collected from, either highly polluted agricultural soils exposed to prolonged irrigation with industrial wastewater or surface soil samples from industrial sites.

关键词： elemental analysis pollution neutron activation analysis

Two New Amides from the Roots of Acorus Tatarinowii Schott

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第1期8卷 35-36页

作者： Wang, mf Lao, AN Wang, HC ACAD SINICA SHANGHAI INST MAT MEDSHANGHAI 200031PEOPLES R CHINA

Two new amides, tataramide A (1) and tataramide B (2), were isolated from the roots of Acorus tatarinowii Schott. Their structures were determined by spectroscopic methods.

关键词： Two New Amides from the Roots of Acorus Tatarinowii Schott

Two New Isopimarane Diterpenes from theRoots of Acorus Tatarinowii Schott

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1997年第1期8卷 37-38页

作者： Wang, mf Lao, AN Wang, HC CHINESE ACAD SCI SHANGHAI INST MAT MED SHANGHAI 200031 PEOPLES R CHINA NIHON UNIV COLL PHARM FUNABASHI CHIBA 274 JAPAN

Two new isoprimarane diterpenes, tatarol (1) and tataroside (2) were isolated from the roots of Acorus tatarinowii Schott. Their structures were identified by spectral methods.

关键词： Two New Isopimarane Diterpenes from theRoots of Acorus Tatarinowii Schott

Photothermal phase change material microcapsules via cellulose nanocrystal and graphene oxide co-stabilized Pickering emulsion for solar and thermal energy storage

在线全文

学校读者我要写书评

暂无评论

Science China Materials 2024年第10期67卷 3225-3235页

作者： Wang Sun Zhe Zhang Zhen Zhang Nisha He Qiang Wei Liu Feng Zhenghao Wang Jie Wu Can Liu Shiyu fu Yelin Hou Gilles Sebe Guofu Zhou SCNU-TUE Joint Lab of Device Integrated Responsive Materials(DIRM) Institute of Electronic Paper DisplaysSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China State Key Laboratory of Biocatalysis and Enzyme Engineering School of Life SciencesHubei UniversityWuhan 430062China Key Laboratory of National Forestry and Grassland Administration on Highly Efficient Utilization of Forestry Biomass Resources in Southwest China Southwest Forestry UniversityKunming 650224China Laboratoire de Chimie des Polymeres Organiques(LCPO) UMR 5629University of BordeauxCNRSBordeaux INPPessac F-33600France State Key Laboratory of Pulp and Paper Engineering South China University of TechnologyGuangzhou 510640China

Phase change materials(PCMs)have attracted significant attention in thermal management due to their ability to store and release large amounts of heat during phase ***,their widespread application is restricted by leakage *** PCMs within polymeric microcapsules is a promising strategy to prevent leakage and increase heat transfer area with ***,photothermal PCM microcapsules are particularly desirable for solar energy ***,we fabricated photothermal PCM microcapsules with melamine-formaldehyde resin(mf)as shell using cellulose nanocrystal(CNC)and graphene oxide(GO)co-stabilized Pickering emulsion droplets as *** displays outstanding Pickering emulsifying ability and can facilitate the fixation of GO at the oil-water interface,resulting in a stable CNC/GO co-stabilized PCM Pickering emulsion.A polydopamine(PDA)layer was coated in-situ on the emulsion droplets via oxidization self-polymerization of ***,GO was reduced to reduced GO(rGO)due to the reducing ability of *** outmost mf shell of the PCM microcapsules was formed in-situ through the polymerization and crosslinking of mf *** resulted PCM@CNC/rGO/PDA/mf microcapsules exhibit uniform sizes in the micrometer range,excellent leakage-proof performance,high phase change enthalpy(175.4 J g^(−1))and PCM encapsulation content(84.2%).Moreover,the presence of rGO and PDA endows PCM@CNC/rGO/PDA/mf microcapsules with outstanding photothermal conversion *** temperature of PCM@CNC/rGO/PDA/mf microcapsule slurries(15wt.%)can reach 73°C after light irradiation at 1 W cm^(−2).Therefore,photothermal PCM@CNC/rGO/PDA/mf microcapsules are promising for solar energy harvesting,thermal energy storage,and release in various applications,such as energy-efficient buildings and smart textiles.

关键词： graphene oxide cellulose nanocrystal Pickering emulsion phase change material microcapsule photothermal