检索结果-南通市图书馆

Industrial Fusion Cascade Detection of solder Joint

在线全文

学校读者我要写书评

暂无评论

Computers, Materials and Continua 2024年第1期81卷 1197-1214页

作者： li C. Zhang P. Wang s. liu l. shi M. Chongqing school University of Chinese Academy of Sciences Chongqing University Chongqing 400044 China Automatic Reasoning and Cognition Research Center Chongqing Institute ofGreen and Intelligent Technology Chinese Academy of Sciences Chongqing 400714 China College of Artificial Intelligence Chongqing School University of Chinese Academy of Sciences Chongqing 400714 China Design department Liuzhou Fuzhen Bodywork Industrial Co. Ltd. Liuzhou 545006 China

With the remarkable advancements in machine vision research and its ever-expanding applications, scholars have increasingly focused on harnessing various vision methodologieswithin the industrial realm. specifically, detecting vehicle floor welding points poses unique challenges, including high operational costs and limited portability in practical settings. To address these challenges, this paper innovatively integrates template matching and the Faster RCnn algorithm, presenting an industrial fusion cascaded solder joint detection algorithm that seamlessly blends template matching with deep learning techniques. This algorithm meticulously weights and fuses the optimized features of both methodologies, enhancing the overall detection capabilities. Furthermore, it introduces an optimized multi-scale and multi-template matching approach, leveraging a diverse array of templates and image pyramid algorithms to bolster the accuracy and resilience of object detection. By integrating deep learning algorithms with this multi-scale and multi-template matching strategy, the cascaded target matching algorithm effectively accurately identifies solder joint types and positions. A comprehensive welding point dataset, labeled by experts specifically for vehicle detection, was constructed based on images from authentic industrial environments to validate the algorithm's performance. Experiments demonstrate the algorithm's compelling performance in industrial scenarios, outperforming the single-template matching algorithm by 21.3%, the multi-scale and multitemplate matching algorithm by 3.4%, the Faster RCnn algorithm by 19.7%, and the YOlOv9 algorithm by 17.3% in terms of solder joint detection accuracy. This optimized algorithm exhibits remarkable robustness and portability, ideally suited for detecting solder joints across diverse vehicle workpieces. notably, this study's dataset and feature fusion approach can be a valuable resource for other algorithms seeking to enhance their

关键词： Cascade object detection deep learning feature fusion multi-scale and multi-template matching solder joint dataset

Modified High-order Upwind Method for Convection Diffusion Equation

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

Acta Mathematicae Applicatae sinica 2002年第1期18卷 131-146页

作者： Wei-dong ZHAO, Dong lIAnGschool of Mathematics and system sciences, shandong university, Jinan 250100, Chinadepartment of Mathematics and statistics, York university, 4700 keele street, Toronto, ontario, M3J 1P3, canada school of Mathematics and system sciences Shandong University Jinan 250100 China department of Mathematics and statistics York University 4700 Keele Street Toronto Ont. M3J 1P3 Canada

In this paper, we study the high-order upwind finite difference method for steady convection-diffusion problems. Based on the conservative convection-diffusion equation, a high-order upwind finite difference scheme on nonuniform rectangular partition for convection-diffusion equation is proposed. The proposed scheme is in conversation form, satisfies maximum value principle and has second-order error estimates in discrete H1 norm. To illustrate our conclusion, several numerical examples are given.

关键词： Convection diffusion high-order upwind method error estimate

Avian responses to an extreme weather event:The case of the‘Filomena’snowstorm in Madrid(central spain)

在线全文

学校读者我要写书评

暂无评论

Avian Research 2024年第2期15卷 180-186页

作者： Carlos lazaro Carlos sanchez-García Fabian Casas E.Jorge Tizado department of Research Fundacion Artemisan13001 Ciudad RealSpain department of Zoology Faculty of SciencesUniversity of GranadaGranadaSpain department of Biodiversity and Environmental Management Universidad de Leon24401 PonferradaSpain

Cold spells and severe weather may have detrimental effects in wild birds,but owing to the stochastic nature of these events,it is not always possible to measure their *** January 2021,a strong snowstorm known as‘Filomena’affected spain,mainly the region of Madrid(Central spain),which was fully covered with snow and suffered freezing temperatures for a *** bird surveys conducted in the winter-spring of 2020 and 2021(before and after Filomena)at same locations,we addressed the possible impact of the cold spell in three widespread gamebirds:Wood Pigeon(Columba palumbus),Eurasian Magpie(Pica pica)and Red-legged Partridge(Alectoris rufa).no significant abundance differences were found between years for none of the species and hunting pressure was only significantly reduced for Partridges,hence this species may have been negatively affected by *** suggest that in response to Filomena,Pigeons conducted partial migration in search of better conditions,while Magpies aggregated in certain areas of Madrid and Partridges endured the harsh conditions within their home *** results highlight the importance to alleviate negative impacts of extreme weather events in wild birds through management actions,especially for sedentary species.

关键词： Alectoris rufa Climate change Cold spell Columba palumbus Migration Pica pica Winter

sUsTAInABlE AGRICUlTURE: ITs sTATUs QUO AnD TREnD In CHInA

在线全文

学校读者我要写书评

暂无评论

Journal of Geographical sciences 1996年第3期6卷 1-12页

作者： Cai Yunlong(department of Geography, Peking university, Beijing 100871People’s Republic of China)Barry smit(department of Geography, university of Guelph)Guelph, ontario, n1G2W1, canada)

Agriculture is a complex of processes that takes place within a threefold (that is, bio-physical, socio-political and techno-economic) environmatal framework. The sustainability of agriculturral systems can also be assessed within this framework. sustainable agnculture has different meanings at various spatial scales At local and regional scales, it is just ecological farming. At national and global scales, however, the emphasis is put on the issues of food production and distribution. Based upon the framework, this paper discusses the current situation and future trend of Chinese agriculture in relation to sustainability.

关键词： sustainable agriculture food supply issue ecological farming China

Further Estimate of Complete Trigonometric sums

在线全文

学校读者我要写书评

暂无评论

清华大学学报(自然科学版) 1989年第6NO.05NO.04NO.03NO.02NO.01期 74-85页

作者： Ding Ping (department of Mathematics, simon Fraser university, canada) Qi Minggao (department of Applied Mathematics, Tsinghua university)

The following theorem is proved: let f(x)=akxk+…a1x+a0 be a polynomial with integral coefficients such that(a1), …,ak, q)=1. where q is a positive integer. Then, for k≥3,

关键词： complete trigonometric sums polynominl with integral coefficients congruent equation

AGInG PROPERTIEs OF THE lIFETIME In sIMPlE ADDITIVE DEGRADATIOn MODEls

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of systems science & Complexity 2011年第4期24卷 753-760页

作者： Xiaohu lI Rongfang YAn Yiqiang ZHAO school of Mathematical science Xiamen University Xiamen 361005 China. College of Mathematics and Information Beienee Northwest Normal University Lanzhou 730050 China. schoolof Mathematics and statistics Carleton University Ottawa Ontario KIS 5B6 Canada.

This paper deals with the simple additive degradation models with single random effect. The authors further study the link between the aging property of the implied lifetime and that of the random variation. It is found that both the aging property of the random variation and the analytical behavior of the mean degradation path influence the aging behavior of the implied lifetime.

关键词： decreasing reversed hazard rate (DRHR) failure rate increasing failure rate (IFR) increasing failure rate in average (IFRA) new better than used (nBU) star-shaped super-additivity.

在线全文

学校读者我要写书评

暂无评论

将混沌序列变换成均匀伪随机序列的普适算法

物理学报 2008年第7期57卷 4007-4013页

作者：盛利元肖燕予盛喆中南大学物理科学与技术学院长沙410083 department of Applied Mathematics science College University of Western Ontario London ON Canada N6A 5B7 中南大学数学与统计学院长沙410075

提出了一种将混沌序列变换成均匀伪随机序列的普适算法.这种算法基于计算机浮点数表示的bit位操作,不针对任何具体对象,可将任意连续或分段连续分布的实型随机变量转换成均匀分布的随机变量.理论分析表明,这种算法源于实型随机变量中普... 详细信息

提出了一种将混沌序列变换成均匀伪随机序列的普适算法.这种算法基于计算机浮点数表示的bit位操作,不针对任何具体对象,可将任意连续或分段连续分布的实型随机变量转换成均匀分布的随机变量.理论分析表明,这种算法源于实型随机变量中普遍存在着的沿bit位以指数规律增强的均匀化趋势.任何实型的混沌序列,不论来自混沌映射系统还是混沌微分动力系统,都可以在同一个标准算法下变换成均匀分布的伪随机序列,因而是混沌伪随机数发生器标准化模块设计和硬件实现的关键技术基础.

关键词：混沌伪随机序列均匀分布函数

Proteomic dissection of biological pathways/processes through profiling protein-protein interaction networks

在线全文

学校读者我要写书评

暂无评论

science China Chemistry 2010年第4期53卷 737-746页

作者： CHEn Xian Institutes for Biomedical sciences, Fudan university, shanghai 200433, China department of biochemistry & Biophysics, school of Medicine, university of north Carolina-Chapel Hill, UsA 1. Institutes for Biomedical sciences Fudan University Shanghai 200433 China2. Department of Biochemistry & Biophysics School of Medicine University of North Carolina-Chapel Hill Chapel Hill USA

Cellular functions, either under the normal or pathological conditions or under different stresses, are the results of the coordinated action of multiple proteins interacting in macromolecular complexes or assemblies. The precise determination of the specific composition of protein complexes, especially using scalable and high-throughput methods, represents a systematic approach toward revealing particular cellular biological functions. In this regard, the direct profiling protein-protein interactions (PPIs) represent an efficient way to dissect functional pathways for revealing novel protein functions. In this review, we illustrate the technological evolution for the large-scale and precise identification of PPIs toward higher physiologically relevant accuracy. These techniques aim at improving the efficiency of complex pull-down, the signal specificity and accuracy in distinguishing specific PPIs, and the accuracy of identifying physiological relevant PPIs. A newly developed streamline proteomic approach for mapping the binary relationship of PPIs in a protein complex is introduced.

关键词： Chen Proteomic dissection of biological pathways/processes through profiling protein-protein interaction networks

A nano-plasmonic HMIM waveguide based concurrent dual-band BPF using circular ring resonator

在线全文

学校读者我要写书评

暂无评论

Optoelectronics letters 2024年第3期20卷 152-156页

作者： Miriyala sridhar surendra kumar Bitra Ts n Murthy koppireddi Padmaraju department of Electronics and Communication Engineering Koneru Lakshmaiah Education FoundationGunturIndia Astra Microwave Products ltd. HyderabadIndia department of Electronics and Communication Engineering JNTU-GV College of EngineeringVizianagaramIndia department of Electronics and Communication Engineering Jawaharlal Nehru Technological University KakinadaKakinadaIndia

This article analyzes the transmission line characteristics of plasmonic hybrid metal insulator metal(HMIM) wave-guide, circular ring resonator(CRR) based dual-band band-pass filters with two transmission poles in both pass-bands in the optical regime using coupled line feed. The transmission line characteristics of an HMIM waveguide, such as characteristic impedance(Z_(PV)), effective refractive index(n_(eff)) and propagation length(l_(spp)), have been obtained by using full wave simulation.

关键词： waveguide resonator circular