检索结果-南通市图书馆

Analytical Solution and Simplified Formula for Added Mass of Horizontal and Vertical Motions of Truncated Cylinders Under Earthquake Action

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第1期38卷 54-67页

作者： WANG Pi-guang LYU Si-yu QU Yang ZHAO Mi DU Xiu-li State Key Laboratory of Bridge Engineering Safety and Resilience Beijing University of TechnologyBeijing 100124China Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of Tech-nologyBeijing 100124China

This paper investigates the hydrodynamic characteristics of floating truncated cylinders undergoing horizontal and vertical motions due to earthquake excitations in the finite water *** governing equation of the hydrodynamic pressure acting on the cylinder is derived based on the radiation theory with the inviscid and incompressible *** governing equation is solved by using the method of separating variables and analytical solutions are obtained by assigning reasonable boundary *** analytical result is validated by a numerical model using the exact artificial boundary simulation of the infinite *** main variation and distribution characteristics of the hydrodynamic pressure acting on the side and bottom of the cylinder are analyzed for different combinations of wide-height and immersion *** added mass coefficient of the cylinder is calculated by integrating the hydrodynamic pressure and simplified formulas are proposed for engineering *** calculation results show that the simplified formulas are in good agreement with the analytical solutions.

关键词： earthquake hydrodynamic pressure truncated cylinder added mass simplified formula

基于特征解耦表征学习的无监督混合失真图像复原方法

在线全文

学校读者我要写书评

暂无评论

计算机辅助设计与图形学学报 2024年第2期36卷 236-247页

作者：符颖李卓遥朱欣宇龚敏学周激流成都信息工程大学计算机学院成都610225 四川省2011图形图像与空间信息协同创新中心成都610225

针对真实场景下多种混合失真组合的多任务图像复原,结合生成对抗网络与编码器提出了一种基于无监督对偶学习的图像复原方法.该方法引入特征解耦模块,通过修正基于增益控制的归一化,将不同退化机制的特征表示分配到不同的特征通道中,使... 详细信息

针对真实场景下多种混合失真组合的多任务图像复原,结合生成对抗网络与编码器提出了一种基于无监督对偶学习的图像复原方法.该方法引入特征解耦模块,通过修正基于增益控制的归一化,将不同退化机制的特征表示分配到不同的特征通道中,使得不同退化特征表达相互独立,实现了通道上的特征解耦.同时,为了进一步过滤掉退化机制的特征表示并保持原图像内容信息的细节,利用通道注意力机制实现特征解耦后自适应地选择有用的特征表示,使其适用于真实场景下混合失真组合的图像复原任务.实验结果表明,所提算法在单一退化类型GoPro数据集上对比基于尺度循环网络的算法(scale-recurrent network,SRN),峰值信噪比和结构相似性2项指标值分别提高了0.499 dB和0.044;在混合退化类型DIV2K数据集上对比基于操作选择注意力网络的算法(operation-wise attention network,OWAN),峰值信噪比和结构相似性2项指标值分别提高了0.163 dB和0.015,在实现复原图像的同时,保留了图像的纹理和细节信息.

关键词：混合失真图像图像复原特征解耦注意力机制

Naturally Crosslinked Biocompatible Carbonaceous liquid Metal Aqueous Ink Printing Wearable Electronics for Multi-Sensing and Energy Harvesting

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第8期16卷 148-168页

作者： King Yan Chung Bingang Xu Di Tan Qingjun Yang Zihua li Hong Fu Nanotechnology Center School of Fashion and TextilesThe Hong Kong Polytechnic UniversityHong Kong 999077People’s Republic of China Department of Mathematics and Information Technology The Education University of Hong KongHong KongPeople’s Republic of China

Achieving flexible electronics with comfort and durability comparable to traditional textiles is one of the ultimate pursuits of smart *** printing is desirable for e-textile development using a simple and inexpensive ***,fabricating high-performance atop textiles with good dispersity,stability,biocompatibility,and wearability for high-resolution,large-scale manufacturing,and practical applications has remained ***,waterbased multi-walled carbon nanotubes(MWCNTs)-decorated liquid metal(LM)inks are proposed with carbonaceous gallium–indium *** the assistance of biopolymers,the sodium alginate-encapsulated LM droplets contain high carboxyl groups which non-covalently crosslink with silk sericin-mediated MWCNTs.E-textile can be prepared subsequently via printing technique and natural waterproof triboelectric coating,enabling good flexibility,hydrophilicity,breathability,wearability,biocompatibility,conductivity,stability,and excellent versatility,without any artificial *** obtained e-textile can be used in various applications with designable patterns and ***-sensing applications of recognizing complex human motions,breathing,phonation,and pressure distribution are demonstrated with repeatable and reliable ***-powered and energy-harvesting capabilities are also presented by driving electronic devices and lighting *** proof of concept,this work provides new opportunities in a scalable and sustainable way to develop novel wearable electronics and smart clothing for future commercial applications.

关键词： Biocompatible Conductive ink Biopolymer E-textile Carbonaceous liquid metal

Genetic pathways in cerebral palsy:a review of the implications for precision diagnosis and understanding disease mechanisms

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第7期19卷 1499-1508页

作者： Yiran Xu Yifei li Seidu A.Richard Yanyan Sun Changlian Zhu Henan Key Laboratory of Child Brain Injury and Henan Pediatric Clinical Research Center Institute of Neuroscience and The Third Affiliated Hospital of Zhengzhou UniversityZhengzhouHenan ProvinceChina National Health Council(NHC)Key Laboratory of Birth Defects Prevention Henan Key Laboratory of Population Defects PreventionZhengzhouHenan ProvinceChina Department of Human Anatomy School of Basic Medicine and Institute of NeuroscienceZhengzhou UniversityZhengzhouHenan ProvinceChina Center for Brain Repair and Rehabilitation Institute of Neuroscience and PhysiologyUniversity of GothenburgGothenburgSweden

Ce rebral palsy is a diagnostic term utilized to describe a group of permanent disorders affecting movement and *** with cerebral palsy are often only capable of limited activity,resulting from non-progressive disturbances in the fetal or neonatal *** disturbances severely impact the child’s daily life and impose a substantial economic burden on the *** cerebral palsy encompasses various brain injuries leading to similar clinical outcomes,the unde rstanding of its etiological pathways remains incomplete owing to its complexity and *** review aims to summarize the current knowledge on the genetic factors influencing cerebral palsy *** is now widely acknowledged that genetic mutations and alterations play a pivotal role in cerebral palsy development,which can be further influenced by environmental fa *** pite continuous research endeavors,the underlying fa ctors contributing to cerebral palsy remain are still ***,significant progress has been made in genetic research that has markedly enhanced our comprehension of the genetic factors underlying cerebral palsy *** r,these genetic factors have been categorized based on the identified gene mutations in patients through clinical genotyping,including thrombosis,angiogenesis,mitochondrial and oxidative phosphorylation function,neuronal migration,and cellular ***,exploring targeted genotypes holds potential for precision *** conclusion,advancements in genetic research have substantially improved our understanding of the genetic causes underlying cerebral *** breakthroughs have the potential to pave the way for new treatments and therapies,consequently shaping the future of cerebral palsy research and its clinical *** investigation of cerebral palsy genetics holds the potential to significantly advance treatments and management *** elucidating the underlying cellular mechanisms,w

关键词： cerebral palsy environmental factors etiology genetic factors genetic mutation movement disorder spastic diplegia

Cr^(3+) activated Na_(3)RESi_(3)O_(9)(RE=Y,Lu,Sc) silicate broadband near-infrared phosphors for luminescence towards NIR-Ⅱ region via a multi-site occupancy strategy

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第8期42卷 1447-1457,I0002页

作者： Jiantong Wang Changshuai Gong Sihan Yang Qi Zhu Xuejiao Wang Ji-Guang li College of Chemistry and Materials Engineering Bohai UniversityJinzhou121007China Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Materials Science and EngineeringNortheastern UniversityShenyang110819China Research Center for Electronic and Optical Materials National Institute for Materials ScienceTsukubaIbaraki 305-0044Japan

Phosphor-converted near-infrared light-emitting diodes(NIR pc-LEDs) are finding applications in various fields including food quality analysis,biomedical imaging,night vision,and *** crucial factor in the development of NIR pc-LEDs devices lies in the advancement of high-performance broadband NIR phosphors,In this work,novel Cr^(3+)-activated silicate phosphors NaRESi_(3)O_(9)(RE=Y,Lu,Sc) are *** silicate has a special 3D network structure in which RE has four different sites,forming four octahedrons and providing suitable occupation sites for Cr^(3+).The phosphors demonstrate a wide emission spectrum ranging from 750 to 1450 nm when excited by light at 468 *** full width at half maximum(FWHM),which benefits from the presence of Cr^(3+)ions occupying multiple sites,is measured to be 203 ***,the strongest emission peak is observed at a longer wavelength of 984 nm compared to most other systems activated by Cr^(3+).The Na_(3)ScSi_(3)O_(9) lattice provides a weak crystal field(Dq/B=1.97) and weak phonon-photon coupling for Cr^(3+),and the integrated emission intensity of Na_(3)ScSi_(3)O_(9):0,03Cr^(3+)is 4.66 times stronger than that of Na_(3)YSi_(3)O_(9):0.03Cr^(3+).

关键词： Rare earths Broadband near-infrared Silicate Photoluminescence Cr^(3+)

Exploring the Interplay between Local Chain Structure and Stress Distribution in Polymer Networks

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第6期42卷 874-885页

作者： Jin-Tong Xue Yang Bai li Peng Xian-Bo Huang Zhao-Yan Sun School of Applied Chemistry and Engineering University of Science and Technology of ChinaHefei230026China State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China National-certified Enterprise Technology Center Kingfa Science and Technology Co.Ltd.Guangzhou510663China

The mechanical behavior of polymer networks is intrinsically correlated with the local chain topology and chain *** this study,we delve into this relationship through the lens of coarse-grained molecular dynamics(CG-MD)*** aim is to illuminate the intricate interplay between local topology and stress distribution within polymer monomers,cross-linkers,and various components with distinct cross-link connections,thereby elucidating their collective impact on the mechanical properties of polymer *** mainly focus on how specific local structures contribute to the overall mechanical response of the *** particular,we employ local stress analysis to unravel the mechanics of these *** findings reveal the diverse responses of individual components,such as junctions,strands,cross-linkers between junctions,and dangling chain ends,when subjected to ***,we observe that these components exhibit varying degrees of deformation tolerance,underscoring the significance of their roles in determining the mechanical characteristics of the *** investigations highlight junctions as primary contributors to stress accumulation,and particles with higher local stress showing a stronger correlation between stress and Voronoi ***,our results indicate that both strands and cross-linkers between junctions exhibit heightened stress levels as strand lengths *** study enhances our understanding of the multifaceted factors governing the mechanical attributes of cross-linked polymer systems at the microstructural level.

关键词： Local chain structure Local stress Molecular dynamics simulation

RepDNet:A re-parameterization despeckling network for autonomous underwater side-scan sonar imaging with prior-knowledge customized convolution

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第5期35卷 259-274页

作者： Zhuoyi li Zhisen Wang Deshan Chen Tsz Leung Yip Angelo P.Teixeira Department of Logistics and Maritime Studies The Hong Kong Polytechnic UniversityChina State Key Laboratory of Maritime Technology and Safety Wuhan University of TechnologyChina School of Transportation and Logistics Engineering Wuhan University of TechnologyChina National Engineering Research Center for Water Transport Safety Wuhan University of TechnologyChina Centre for Marine Technology and Ocean Engineering(CENTEC) Instituto Superior TecnicoUniversidade de LisboaPortugal

Side-scan sonar(SSS)is now a prevalent instrument for large-scale seafloor topography measurements,deployable on an autonomous underwater vehicle(AUV)to execute fully automated underwater acoustic scanning imaging along a predetermined ***,SSS images often suffer from speckle noise caused by mutual interference between echoes,and limited AUV computational resources further hinder noise *** approaches for SSS image processing and speckle noise reduction rely heavily on complex network structures and fail to combine the benefits of deep learning and domain *** address the problem,Rep DNet,a novel and effective despeckling convolutional neural network is *** DNet introduces two re-parameterized blocks:the Pixel Smoothing Block(PSB)and Edge Enhancement Block(EEB),preserving edge information while attenuating speckle *** training,PSB and EEB manifest as double-layered multi-branch structures,integrating first-order and secondorder derivatives and smoothing *** inference,the branches are re-parameterized into a 3×3 convolution,enabling efficient inference without sacrificing *** DNet comprises three computational operations:3×3 convolution,element-wise summation and Rectified linear Unit *** on benchmark datasets,a real SSS dataset and Data collected at Lake Mulan aestablish Rep DNet as a well-balanced network,meeting the AUV computational constraints in terms of performance and latency.

关键词： Side-scan sonar Sonar image despeckling Domain knowledge Re-parameterization

基于三维气弹模型的悬索桥2类吊索尾流致振及其控制措施研究

在线全文

学校读者我要写书评

暂无评论

中国公路学报 2024年第7期37卷 147-156页

作者：李寿英李啸宇邓羊晨宋神友陈焕勇陈政清湖南大学风工程与桥梁工程湖南省重点实验室湖南长沙410082 华东交通大学土木建筑学院江西南昌330013 深中通道管理中心广东中山528449

大跨度悬索桥吊索频率低、阻尼小,极易在风荷载作用下发生大幅振动。为比较研究平行钢丝和钢丝绳2类吊索尾流致振特性的差异,以深中通道伶仃洋大桥四索股吊索为工程背景进行了系统的试验研究。首先,设计并制作了2类吊索的气弹模型,并进... 详细信息

大跨度悬索桥吊索频率低、阻尼小,极易在风荷载作用下发生大幅振动。为比较研究平行钢丝和钢丝绳2类吊索尾流致振特性的差异,以深中通道伶仃洋大桥四索股吊索为工程背景进行了系统的试验研究。首先,设计并制作了2类吊索的气弹模型,并进行了模型动力参数识别;然后,进行了2类吊索的气弹模型测振风洞试验,比较研究了风速和风攻角等参数对2类四索股吊索尾流致振的影响规律;最后,进行了多种抑振措施(包括分隔架、调谐质量阻尼器、辅助索和增加结构阻尼等)对上述2类四索股吊索风致振动的抑振效果研究。结果表明:2类吊索发生尾流致振的最不利攻角均为75°,并在多个工况下发生碰索现象,吊索主要为一阶振动,轨迹呈顺时针椭圆;相较于平行钢丝吊索,钢丝绳吊索发生尾流致振的风攻角范围更大;采用等间距3个分隔架可有效抑制吊索相对振动,在此基础上,增加辅助索措施可有效抑制吊索的整体振动。

关键词：桥梁工程悬索桥吊索风洞试验尾流致振三维气弹模型振动控制

DIA-based quantitative proteomic analysis on porcine meat quality at different chilling rates

在线全文

学校读者我要写书评

暂无评论

Food Science and Human Wellness 2024年第5期13卷 2573-2583页

作者： Yuqiang Bai Tongjing Yan Fei Fang Xin li Su Wang Juan li Chengli Hou Dequan Zhang Key Laboratory of Agro-Products Quality and Safety Control in Storage and Transport Process Ministry of Agriculture and Rural AffairsInstitute of Food Science and TechnologyChinese Academy of Agricultural SciencesBeijing 100193China

The objective of this study was to evaluate the effects of chilling rate on porcine meat quality from the perspective of proteome using data independent acquisition(DIA)-based quantitative proteomic strategy. M. longissimus thoracis et lumborum(n = 9) was assigned randomly to the control group(3.72 ℃/h), very fast chilling-Ⅰ group(VFC-Ⅰ, 9.31℃/h) and VFC-Ⅱ group(14.43 ℃/h). The DIA was used to analyze the difference in proteins under different chilling rates. Results showed that tenderness was improved significantly in meat at the chilling rate of 14.43 ℃/h. Seventy-nine differential abundant proteins(fold change > 1.5, P lism, pyruvate metabolism and proteasome pathways. These pathways indicated that VFC delayed cell metabolism and glycolysis by down-regulating the expression of metabolic enzymes. The tenderness was improved by up-regulating the expression of proteasome and m-calpain.

关键词： Very fast chilling Tenderness Proteomic Glycolysis Proteasome

同方期刊数据库