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Numerical and experimental studies on propulsion performance of a novel tandem paddles propulsor 认领 引用
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作者 Longqing Xin Peng Liu +4 位作者 Huajun Li Siqi Wang Yuhua Lyu Yaqian Li Guodong Feng 《Journal of Ocean Engineering and Science》 SCIE CSCD 2025年第4期475-491,共17页
Normally,small unmanned vessels used to clean floating litter on water adopt a paddle wheel as a propulsor to satisfy its shallow-draft requirements;however,this type of propulsor has bulky structures and inefficient ... Normally,small unmanned vessels used to clean floating litter on water adopt a paddle wheel as a propulsor to satisfy its shallow-draft requirements;however,this type of propulsor has bulky structures and inefficient propulsion.In this study,a novel tandem paddles propulsor(TPP)was developed,and its propulsion performance was analyzed and compared with that of a paddle wheel propulsor(PWP).Using the RNG k-εturbulence model and sliding grid technique,the hydrodynamic performance of the PWP was simulated in computational fluid dynamics(CFD)software to verify the reliability of the numerical method.Subsequently,the propulsion performances of the two types of propulsors were simulated with different immersion depths and advanced coefficients,and the differences in their mechanical characteristics and flow field evolution were discussed and compared.The results indicate that the proposed TPP generates 2.75 times more thrust and 1.99 times greater efficiency than the PWP,exhibiting superior propulsion capability in shallow-draft vessels. 展开更多
关键词 Tandem paddles propulsor Propulsion performance CFD Hydrodynamic experiment Flow field Two-phase flow
Controlling the size of fragrance microcapsules using designed agitator paddles: Experiment and CFD simulation 认领 引用 被引量：4
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作者 Hongbin Zhao Xuening Fei +3 位作者 Baolian Zhang Shuxing Zhao Guangmin Li Lingyun Cao 《Particuology》 SCIE EI CAS CSCD 2019年第2期38-45,共8页
Controlling the size of fragranee microcapsules using designed agitator paddles was investigated and studied by CFD simulation. First, different fluid flows were established by varying stirring speeds, reactor scales,... Controlling the size of fragranee microcapsules using designed agitator paddles was investigated and studied by CFD simulation. First, different fluid flows were established by varying stirring speeds, reactor scales, and agitator paddle design, and the effects of each on particle size and distribution of prepared microcapsules were determined. The experimental results showed that the pattern design of orifices in the plate paddles control the flow field well. Narrow particle-size distributio ns of the microcapsules were obtained. The fluid flow characteristics including fluid velocity field, turbulent kinetic energy field, and shear stress distribution for thedifferent agitator paddle types in different reaction kettles were simulated using CFD tech no logy. The correlations between simulated data and experime ntal results were an alyzed. Significantly, the simulated average flow velocity was found to show good negative linear correlation w让h the average particle size of prepared microcapsules, with a correlation of y =-2.166x + 42.626. 展开更多
关键词 Fragrance microcapsule Melamine-formaldehyde Particle size Orifice stirring paddle CFD simulation
基于Paddle OCR模型的烧结台车信息识别 认领 引用
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作者 刘兴强 汪向硕 +4 位作者 赵伟 高大伟 张艳兵 安臣 姜爽 《冶金设备》 2026年第2期41-45,73,共5页
烧结台车信息识别过程便于全生命周期运行维护。本文构建了一套基于图像识别的烧结台车信息识别系统,应用海康威视SDK视频控件对烧结台车侧面进行实时抓图,采用改进Paddle OCR模型识别运行号和台车编码,将识别的140个运行号和台车编码... 烧结台车信息识别过程便于全生命周期运行维护。本文构建了一套基于图像识别的烧结台车信息识别系统,应用海康威视SDK视频控件对烧结台车侧面进行实时抓图,采用改进Paddle OCR模型识别运行号和台车编码,将识别的140个运行号和台车编码保存到数据库中,然后根据实际分布进行画面展示,识别结果准确率达到95%,当识别运行号发生变化时,同步更新显示烧结台车编码。该系统能够实现台车准确定位和信息统计监测。 展开更多
关键词 烧结台车 图像识别 Paddle OCR模型 定位
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Dragon Boat Festival 认领 引用
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作者 Evangelyn Stephen 《空中英语教室（初级版．大家说英语）》 2026年第6期32-35,54,56,共4页
Dragon Boat Festival is almost here!An exciting way to celebrate this festival is dragon boat racing.Long boats with dragon heads race to honor a famous ancient poet.About 20 people paddle each boat.Another person bea... Dragon Boat Festival is almost here!An exciting way to celebrate this festival is dragon boat racing.Long boats with dragon heads race to honor a famous ancient poet.About 20 people paddle each boat.Another person beats a drum to help everyone paddle together.Another person steers the boat.Dragon boat races don't only happen during Dragon Boat Festival.There are dragon boat competitions many times a year.About 50 million people in almost 100 countries enjoy the sport. 展开更多
关键词 sport dragon boat competitions drum Dragon Boat Festival dragon boat paddle dragon boat racing boat steering
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Paddles of Life 认领 引用
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作者 LI MIN FAN YI 《Women of China》 SCIE 1996年第12期41-42,共2页
JULY 27, 1996. In the women’s kayak pairs at the 1996 Olympic Games in Atlanta, Chinese athletes Cao Mianying and Zhang Xiuyun were still fourth place when approaching the 1,000 meter mark. They creeped to third by 1... JULY 27, 1996. In the women’s kayak pairs at the 1996 Olympic Games in Atlanta, Chinese athletes Cao Mianying and Zhang Xiuyun were still fourth place when approaching the 1,000 meter mark. They creeped to third by 1,500 meters and during the final sprint they beat the Netherlands by a narrow margin to capture the silver. 展开更多
关键词 In Zhang Paddles of Life
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Let's Play Ping-Pong! 认领 引用
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作者 Ruth Devlin 《空中英语教室（初级版．大家说英语）》 2025年第6期24-27,53,56,共4页
Many people play table tennis.You can also call it Ping-Pong.It is a fun game.How do you play?You need a table tennis table with a net in the middle.You also need a Ping-Pong ball,some paddles and a friend.First,hit t... Many people play table tennis.You can also call it Ping-Pong.It is a fun game.How do you play?You need a table tennis table with a net in the middle.You also need a Ping-Pong ball,some paddles and a friend.First,hit the ball with your paddle.The ball goes over the net.Then your friend hits it back to you.Then you hit it again.The ball can move quickly!So sometimes you miss it. 展开更多
关键词 ball game ping pong table tennis net paddle
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基于卷积神经网络的身份证信息识别在政务系统的实践 认领 引用
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作者 张德强 《电脑与信息技术》 2025年第5期75-78,共4页
卷积神经网络是人工智能的基础,在图像分类、图像检索、目标检测和识别等应用场景中得到了广泛应用。电子政务系统通常需要对提交的申请资料进行人工比对审核,这带来效率低、容易出差错的问题。基于此,结合百度公司开发的深度学习框架飞... 卷积神经网络是人工智能的基础,在图像分类、图像检索、目标检测和识别等应用场景中得到了广泛应用。电子政务系统通常需要对提交的申请资料进行人工比对审核,这带来效率低、容易出差错的问题。基于此,结合百度公司开发的深度学习框架飞桨Paddle,介绍一种基于卷积神经网络原理,通过系统识别身份证图片信息后进行自动比对审核的政务应用实践。实际使用表明,该系统有效提升了审核效率和准确度。 展开更多
关键词 飞桨Paddle 卷积神经网络 光学字符识别 政务系统 身份证识别
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Experimental Investigation of Particles Dynamics and Solid-Liquid Mixing Uniformity in a Stirred Tank 认领 引用 被引量：2
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作者 Kai Yang Qinwen Yao +4 位作者 Yingshan Li Wanchang Chen Saleh Khorasani Hua Wang Qingtai Xiao 《Fluid Dynamics & Materials Processing》 EI 2024年第11期2585-2602,共18页
Particle suspension and deposition dynamics are significant factors affecting the level of mixing quality in solidliquid two-phase stirring processes. In general, the ability to increase the suspension rate and minimi... Particle suspension and deposition dynamics are significant factors affecting the level of mixing quality in solidliquid two-phase stirring processes. In general, the ability to increase the suspension rate and minimize depositioneffects is instrumental in improving the uniformity of particle mixing, accelerating the reaction of involved solidliquid two-phase, and improving the efficiency of production operations. In this work, suspension and depositionindicator based on the Betti number and a uniformity indicator are introduced and obtained by means of imageanalysis. The influence of the blade type, rotation speed, blade diameter and blade bottom height on the particlesuspension/deposition characteristics and mixing uniformity are carefully investigated. The experimental resultsshow that the two-phase motion region can be divided into three local regions, including a bottom motion alongthe wall, a low-degree suspension region under the blade and a high suspension region above the blade. The bestdegree of particle suspension is attained by the double-inclined blade paddle at a speed of 270 r/min, a paddlediameter ratio of 0.414, and a height-diameter ratio of 0.086. The double-inclined blade paddle has a better effecton promoting particle suspension and solid-liquid two-phase mixing uniformity. 展开更多
关键词 Solid-liquid particle suspension mixing uniformity Betti number paddle types
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Emission and drying kinetics of paper mill sludge during contact drying process 认领 引用 被引量：1
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作者 Wen-yi DENG Xiao-dong LI +4 位作者 Jian-hua YAN Fei WANG Sheng-yong LU Yong CHI Ke-fa CEN 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2009年第11期1670-1677,共8页
The emission and contact drying kinetics of the paper mill sludge (PMS) were studied through experiments carried out in a paddle dryer. To get a better understanding of its drying mechanism, a penetration model develo... The emission and contact drying kinetics of the paper mill sludge (PMS) were studied through experiments carried out in a paddle dryer. To get a better understanding of its drying mechanism, a penetration model developed by Tsotsas and Schlünder (1986) was used to simulate the drying kinetics of the PMS. The result indicated that this kinetics could be divided into three phases: pasty, lumpy and granular phases, and could be successfully simulated by the penetration model as the related sludge parameters were integrated into the model. The emission rate curves of the volatile compounds (VCs) were interrelated to the drying rate curve of the PMS, especially for volatile fatty acids (VFAs) and ammonia in this study. 展开更多
关键词 Contact drying Emission Paper mill sludge （PMS） Paddle dryer
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基于Paddle Lite的太湖莼菜检测测试平台设计 认领 引用 被引量：1
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作者 陶杰 陈啟源 朱恒通 《电子制作》 2024年第3期66-69,共4页
本文根据太湖莼菜种植槽中图像检测系统的试验需求,设计检测系统。由EasyDL平台采用PaddlePaddle框架训练出图像检测模型,采用Andriod平板上运行检测模型,并通过WiFi发送操制指令至运动控制终端。采用Arduino控制步进驱动器,调整摄像头... 本文根据太湖莼菜种植槽中图像检测系统的试验需求,设计检测系统。由EasyDL平台采用PaddlePaddle框架训练出图像检测模型,采用Andriod平板上运行检测模型,并通过WiFi发送操制指令至运动控制终端。采用Arduino控制步进驱动器,调整摄像头位置,实现检测目标的中心定位要求。根据手动、自动运动控制要求,设计上层通信协议。运动控制终端轮询串口接收指令,判断电机的运动状况,定时中断子程序实现步进驱动器引脚上的电平状况。 展开更多
关键词 Paddle Lite 太湖莼菜 图像检测 Arduino Andriod
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基于Paddle云平台的机器学习课程建设探索 认领 引用
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作者 董如意 王通 《电脑知识与技术》 2021年第34期234-235,共2页
机器学习作为人工智能领域的一个重要分支,成为当前数据智能时代的热点领域之一。机器学习作为一门新兴的课程,各高校对其课程建设仍然在探索中。本文从机器学习课程的教学内容、教学方法以及考核方式进行了建设探索,并通过引入百度云... 机器学习作为人工智能领域的一个重要分支,成为当前数据智能时代的热点领域之一。机器学习作为一门新兴的课程,各高校对其课程建设仍然在探索中。本文从机器学习课程的教学内容、教学方法以及考核方式进行了建设探索,并通过引入百度云平台减少实验室建设投入,给出了机器学习课程一整套建设方案。 展开更多
关键词 Paddle云平台 机器学习 课程建设
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基于Paddle OCR识别水准标尺检定证书的方法研究 认领 引用 被引量：6
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作者 齐文 刘晓云 +2 位作者 王建文 马润霞 刘和平 《测绘与空间地理信息》 2024年第9期188-191,196,共4页
传统水准测量数据处理作业中,采用人工方式读取标尺检定证书信息,一定程度制约了水准测量数据处理实现全流程自动化。本文基于Paddle OCR模型识别标尺检定证书图片中的文字信息,对块状识别结果进行分行整理,经过数据清洗、联系上下文、... 传统水准测量数据处理作业中,采用人工方式读取标尺检定证书信息,一定程度制约了水准测量数据处理实现全流程自动化。本文基于Paddle OCR模型识别标尺检定证书图片中的文字信息,对块状识别结果进行分行整理,经过数据清洗、联系上下文、信息互补校验等操作后获取关键信息,实现了水准标尺检定信息的自动化提取。经验证,该识别方法精度达到98.7%,可以承担工程应用中对算者的角色,为实现人工智能技术与测绘地理信息专业的交叉融合提供技术参考,也为未来开发智能化无人水准测量数据处理软件提供技术储备。 展开更多
关键词 水准标尺检定证书 Paddle OCR 图片文字识别 人工智能
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基于SRGAN的图像超分辨率方法研究 认领 引用 被引量：2
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作者 侯开纪 叶海洋 +1 位作者 张莆林 刘哲 《现代计算机》 2023年第3期69-72,共4页
基于机器学习的图像超分辨率系统主要应用于摄像设备分辨率不足、图像精度受损等场景,通过机器学习算法模型的方法解决对高清图像的需求问题。使用基于SRGAN图像超分辨率上的模型,对传统SRGAN模型的有关网络和函数进行改进和优化:通过... 基于机器学习的图像超分辨率系统主要应用于摄像设备分辨率不足、图像精度受损等场景,通过机器学习算法模型的方法解决对高清图像的需求问题。使用基于SRGAN图像超分辨率上的模型,对传统SRGAN模型的有关网络和函数进行改进和优化:通过对优化器Adam进行改进、调整学习率以及使用图像降噪等技术,使得重建的图像细节更加清晰,整体表现出较好的性能。 展开更多
关键词 深度学习 超分辨率 paddle paddle 生成对抗网络 SRGAN
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基于弹性融合的人群密度估算技术的应用 认领 引用
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作者 曹思聪 《沈阳师范大学学报（自然科学版）》 CAS 2022年第5期457-461,共5页
人流密度估计被越来越多的机构所重视。由于人眼的估计速度和准确率无法满足应用需求,基于深度学习和卷积神经网络的相关理论,构建了一个卷积神经网络模型来实现人群密度检测。采用百度的paddle框架构建实验,使用YOLOv3目标检测+加权图... 人流密度估计被越来越多的机构所重视。由于人眼的估计速度和准确率无法满足应用需求,基于深度学习和卷积神经网络的相关理论,构建了一个卷积神经网络模型来实现人群密度检测。采用百度的paddle框架构建实验,使用YOLOv3目标检测+加权图融合方式,对不同人群数量的样本进行实验。对0~30人和50~540人分别进行了crowdnet和混合图融合模式模拟实验,通过调整学习率、采用Adam优化器、训练权重衰减率等参数调整,达到了93.68%的准确率,比近些年的crowdnet(87.84%)高出近6个百分点,达到了预期要求。 展开更多
关键词 深度学习 paddle框架 YOLOv3 弹性融合
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Evaluation of the Power Generation Capacity of Hydrokinetic Generator Device Using Computational Analysis and Hydrodynamic Similitude 认领 引用 被引量：1
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作者 Oladapo S. Akinyemi Terrence L. Chambers Yucheng Liu 《Journal of Power and Energy Engineering》 2015年第8期71-82,共12页
This paper presents a similitude and computational analysis of the performance of a scaled-down model of a paddle wheel style hydrokinetic generator device used for generating power from the flow of a river. The paddl... This paper presents a similitude and computational analysis of the performance of a scaled-down model of a paddle wheel style hydrokinetic generator device used for generating power from the flow of a river. The paddle wheel dimensions used in this work are one-thirtieth scale of the full-size paddle wheel. The reason for simulating the scaled-down model was to prepare for the testing of a scaled-down physical prototype. Computational Fluid Dynamics using ANSYS Fluent 14.0 software was used for the computational analysis. The scaled-down dimensions were used in the simulations to predict the power that can be generated from the scaled size model of the paddle wheel, having carried out similitude analysis between the scaled down size and its full-size. The dimensionless parameters employed in achieving similitude are the Strouhal number, power coefficient, and pressure coefficient. The power estimation of the full-size was predicted from the scaled size of the paddle wheel based on the similitude analysis. 展开更多
关键词 Similitude Paddle Wheel CFD Power Generation Hydrokinetics
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Results of Open Surgical Treatment of Humeral Paddle Fractures about 63 Cases 认领 引用
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作者 Mansi Zied Chermiti Wajdi +4 位作者 Rbai Hedi Saadana Jacem Zaidi Bacem Sindi Sihem Gazzah Wael 《Open Journal of Orthopedics》 2024年第1期83-91,共9页
Fractures of the humeral paddle, common to young adults, are most often complex, linked to violence and an increase in road accidents. The objective of our work is to evaluate our functional results, in the medium ter... Fractures of the humeral paddle, common to young adults, are most often complex, linked to violence and an increase in road accidents. The objective of our work is to evaluate our functional results, in the medium term, correlated with a review of the literature. This is a retrospective study of 63 patients, carried out in the traumatology-orthopedics department 1 of the IBN EL JAZZAR hospital in KAIROUAN, over a period of 7 years from January 2015 to December 2021. The average age of patients was 39 years (17 - 68 years). Predominantly male. The etiologies are dominated by falls and accidents on public roads. Fractures are classified according to the Müller and Allgöwer classification where type C is found in 51% of cases. All our patients undergo an olecranon osteotomy in 71% of cases. Osteosynthesis using a Lecestre plate combined with screwing or plugging is used in 84% of cases. The evolution is marked by complications observed in eight patients (16%), including two cases of sepsis, four cases of elbow stiffness (8%), one case of joint callus and one case of pseudarthrosis. Our results are evaluated according to the Mayo Elbow Performance Score, they are excellent and good in 71% of cases, average in 18% of cases and poor in 11% of cases. Fractures of the humeral paddle are fractures with a satisfactory functional prognosis, requiring ad integrum anatomical restoration and solid osteosynthesis allowing early rehabilitation of the elbow. One case of joint callus and one case of pseudarthrosis. 展开更多
关键词 Fracture Humeral Paddle Surgical Treatment
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记数划水器 认领 引用
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《车时代》 2001年第9期54-54,共1页
关键词 记数划水器 游泳运动 Dream Paddle划水器
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SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A NEW tetrakis-(CARBOXYLATO-O,O’) BRIDGED DICOPPER COMPLEX WITH TRIPHENYLPHOSPHINOPROPIONATE 认领 引用
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作者 李松林 幺志霞 +1 位作者 郑冀 张明杰 《Transactions of Tianjin University》 CAS 2000年第2期194-197,共4页
A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray ... A novel binuclear copper (Ⅱ) complex,namely [Cu 2｛Ph 3P(CH 2) 2CO 2｝ 4(NO 3) 2]·(NO 3) 2 1,has been synthesized from the reaction of Cu(NO 3) 2·4H 2O with Ph 3P +(CH 2) 2CO - 2 L.The single crystal X ray structural analysis of 1 indicates that the compound crystallizes in space group P1(No.2) with a=12.652(3),b=18.983(4),c=9.102(3),α=97.26(2)°,β=107.38(2)°,γ=102.22(2)° and Z=1.In complex 1,a pair of Cu(Ⅱ) atoms are bridged by carboxylate groups of four ligand molecules with a Cu…Cu distance of 2.738  to form a tetrakis (carboxylato O,O) bridge dimetal core,and the apical coordination positions are occupied by monodentate nitrato anions,which is rare in the structures of similar Cu(Ⅱ) complexes in which the apical ligands are usually neutral molecules.The result shows that introducing the anionic ligands into the coordination sphere of the Cu(Ⅱ) atom significantly increases the Cu…Cu distance. 展开更多
关键词 copper(Ⅱ) complex paddle wheel-like dimetal cage crystal structure tertiary phosphine betaine triphenylphosphinopropionate
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方形液-液萃取搅拌槽搅拌功率准数的测定 认领 引用
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作者 杨扬 尹芳华 +1 位作者 高广达 万胜林 《常州大学学报（自然科学版）》 CAS 1993年第Z1期30-34,共5页
本实验测定了在工业中常用的双层双叶平板桨在方形搅拌槽中海-液混合过程的搅拌功率准数,主方形搅拌槽功率的放大计算提供了依据。实验表明:不加挡板的方形搅拌槽在搅拌过程中仍存在着“圆筒形旋转涡流”和“气穴”。加档板后“圆筒形... 本实验测定了在工业中常用的双层双叶平板桨在方形搅拌槽中海-液混合过程的搅拌功率准数,主方形搅拌槽功率的放大计算提供了依据。实验表明:不加挡板的方形搅拌槽在搅拌过程中仍存在着“圆筒形旋转涡流”和“气穴”。加档板后“圆筒形旋转涡流”和“气穴”消失,且搅拌功率明显上升。为改善萃取过程的传质效果,方形槽以设置挡板为佳。 展开更多
关键词 Square Stirred Tanks Paddle of Double Layer Plate Power Number.
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Effect of impeller rotational speed and paddle angle on binary mixing in a paddle mixer based on DEM 认领 引用 被引量：1
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作者 Defu Wang Jiaqi Yu +5 位作者 Zhijun Lv Yanhui Song Huinan Huang Hui Tian Haibo Wang Baohao Su 《Particuology》 SCIE EI CAS CSCD 2025年第7期178-189,共12页
The discrete element method(DEM)and experimental measurements were employed to investigate the influence of impeller rotational speed and paddle angle on the mixing characteristics of two types of non-spherical partic... The discrete element method(DEM)and experimental measurements were employed to investigate the influence of impeller rotational speed and paddle angle on the mixing characteristics of two types of non-spherical particles in a paddle mixer.A close agreement between the simulation and experimental data was observed.By analyzing the motion of particles,it was found that a wide range of diffusion motion occurred when the particles pushed by the paddle blades rolled down the surface of the upper flowing layer of particles in the vessel,which caused the strong circumferential motion of particles,meanwhile promoted the axial movement of particles.The mixing characteristics were analyzed using relative standard deviation(RSD),velocity frequency distribution,diffusivity coefficient and Peclet numbers.The mixing process was accelerated at the rotational speeds of 15,20,and 25 rpm,meanwhile the superior mixing performance was achieved at the paddle angles of 30°and 45°in the study.The fluidity of particles in circumferential direction was higher than that in axial direction.Diffusion was the prevailing mixing mechanism in the current mixing system. 展开更多
关键词 Paddle mixer Discrete element method(DEM) Non-spherical particle Particle motion Mixing characteristics
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