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Optimal Structural Parameters for a Plastic Centrifugal Pump Inducer

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Fluid Dynamics & Materials Processing 2023年第4期19卷 869-899页

作者： Wenbin Luo lingfeng tang Yuting Yan Yifang Shi School of Mechanical Engineering Anhui Polytechnic UniversityWuhu241000China Hohai University Nanjing210098China

The aim of the study is to determine the optimal structural parameters for a plastic centrifugal pump inducer within the framework of an orthogonal experimental *** this purpose,a numerical study of the related flow field is performed using *** shaft power and the head of the pump are taken as the evaluation ***,the examined variables are the thickness(S),the blade cascade degree(t),the blade rim angle(β1),the blade hub angle(β2)and the hub length(L).The impact of each structural parameter on each evaluation index is examined and special attention is paid to the following combinations:S2 mm,t 2,β1235°,β2360°and L 140 mm(corresponding to a maximum head of 98.15 m);S 5 mm,t 1.6,β1252°,β2350°and L 140 mm(corresponding to a minimum shaft power of 63.06 KW).Moreover,using least squares and fish swarm algorithms,the pump shaft power and head are further optimized,yielding the following optimal combination:S 5 mm,t 1.9,β1252°,β2360°and L 145 mm(corresponding to the maximum head of 91.90 m,and a minimum shaft power of 64.83 KW).

关键词： Plastic centrifugal pump inducer cascade degree shaft power parameter optimization

Evaluating the relative importance of predictors in Generalized Additive Models using the *** R package

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Plant Diversity 2024年第4期46卷 542-546页

作者： Jiangshan Lai Jing tang Tingyuan Li Aiying Zhang lingfeng Mao College of Ecology and Environment Nanjing Forestry UniversityNanjing210037China Research Center of Quantitative Ecology Nanjing Forestry UniversityNanjing 210037China University of Chinese Academy of Sciences Beijing100049China Guangzhou Climate and Agro-meteorology Center Guangzhou 511430China Guangdong Ecological Meteorological Center Guangzhou 510640China

Generalized Additive Models(GAMs)are widely employed in ecological research,serving as a powerful tool for ecologists to explore complex nonlinear relationships between a response variable and ***,evaluating the relative importance of predictors with concurvity(analogous to collinearity)on response variables in GAMs remains a *** address this challenge,we developed an R package named *** calculates individual R^(2) values for predictors,based on the concept of'average shared variance',a method previously introduced for multiple regression and canonical *** these individual R^(2)s,which add up to the overall R^(2),researchers can evaluate the relative importance of each predictor within *** illustrate the utility of the *** package by evaluating the relative importance of emission sources and meteorological factors in explaining ozone concentration variability in air quality data from London,*** believe that the *** package will improve the interpretation of results obtained from GAMs.

关键词： Average shared variance Coefficient of determination Commonality analysis GAMs Hierarchical partitioning Individual R^(2)

Experimental and Numerical Analysis of the Relationship between Pressure and Drip Rate in a Vertical Polypropylene Infusion Bag

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Fluid Dynamics & Materials Processing 2021年第6期17卷 1143-1164页

作者： Weiwei Duan lingfeng tang School of Mechanical Engineering Anhui Polytechnic UniversityWuhu241000China

Vertical infusion(self-emptying)bags used for Intravenous infusion are typically obtained by moulding a soft envelope of *** normal conditions a continuous flow of liquid can be obtained with no need to use a *** the present study,the relationship between air pressure effects and the drug drip rate have been investigated experimentally and *** determining relevant experimental data about the descending height of liquid level,the dropping speed and pressure,the ordinary least square method and MATLAB have been used to reconstruct the related variation and interrelation *** simulations have been performed to determine the best gas-liquid volume ratio and improve the overall performances of these *** to these results,that the biggest effect on the drip rate is produced by the diameters of the used needles.

关键词： Polypropylene infusion bag numerical simulations gas-liquid volume ratio overall performances drip rate

The mid-domain effect in flowering phenology

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Plant Diversity 2024年第4期46卷 502-509页

作者： Yanjun Du Rongchen Zhang Xinran tang Xinyang Wang lingfeng Mao Guoke Chen Jiangshan Lai Keping Ma School of Tropical Agriculture and Forestry(School of Agricultural and Rural Affairs School of Rural Revitalization)Hainan UniversityHaikou 570228China HNU-ASU Joint International Tourism College Hainan UniversityHaikou 570228China School of Ecological and Environmental Sciences East China Normal UniversityShanghai 200062China College of Ecology and Environment Nanjing Forestry UniversityNanjing 210037China State Key Laboratory of Vegetation and Environmental Change Institute of BotanyChinese Academy of SciencesBeijing 100093China

The timing of flowering is an important driver of species distribution and community assembly ***,we still have much to learn about the factors that shape flowering diversity(i.e.,number of species flowering per period) in plant *** potential explanation of flowering diversity is the mid-domain effect,which states that geometric constraints on species ranges within a bounded domain(space or time) will yield a mid-domain peak in diversity regardless of ecological ***,we determine whether the mid-domain effect explains peak flowering time(i.e.,when most species of communities are flowering) across *** used phenological data of 16,267 herbaceous and woody species from the provincial Flora in China and species distribution data from the Chinese Vascular Plant Distribution Database to determine relationships between the observed number of species flowering and the number of species flowering as predicted by the mid-domain effect model,as well as between three climatic variables(mean minimum monthly temperature,mean monthly precipitation,and mean monthly sunshine duration).We found that the mid-domain effect explained a significant proportion of the temporal variation in flowering diversity across all species in ***,the mid-domain effect explained a greater proportion of variance in flowering diversity at higher latitudes than at lower *** patterns of flowering diversity for both herbaceous and woody species were related to both the mid-domain effect and environmental *** findings indicate that including geometric constraints in conjunction with abiotic and biotic predictors will improve predictions of flowering diversity patterns.

关键词： Flowering diversity Functional biogeography Latitudinal gradient Macroecology Macrophenology Null model

Mass transfer analysis for microwave hot in-place recycling of asphalt pavements

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High Technology Letters 2012年第1期18卷 96-100页

作者： Sun Tongsheng Shi Jinfei tang lingfeng School of Mechanical and Automotive Engineering Anhui Polytechnic University Wuhu 241000 P.R. China School of Mechanical Engineering Southeast University Nanjing 211189 P.R. China

In order to realize mass transfer analysis for microwave hot in-place recycling of asphalt pavements, a volume element is established including asphalt mixtures, liquid water and vapor. A mass transfer control model is built by the theory of multiphysics, phase transformation and diffusion. The model contains continuity equation, energy conservation equation, movement equation and vapor diffusion equation. To gain the solution of the mass transfer model, the formulas are simplified to one-dimensional differential equations. And then a mathematical model of boundary conditions is established. The mass transfer velocity and dissipative energy are obtained in different moisture contents through simulation of asphalt pavements recycling. The result indicates that when initial moisture content is certain, mass transfer velocity is almost uniform in depth direction at the same heating time and enertrv absorbed by water i,~ descendino with denletion of moisture.

关键词： asphalt pavements mass transfer model mass transfer velocity energy absorption efficiency

Long-term in-situ monitoring of anchoring system and preliminary analysis of monitoring data

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Journal of Earth Science 2024年

作者： Luobin Zheng Huiming tang Liangqing Wang Changdong Li Chengren Xiong Zongxing Zou Chenlu Wang lingfeng Zhu Yifan Zhang Faculty of Engineering， China University of Geosciences Badong National Observation and Research Station of Geohazards，China University of Geosciences

The geological environment in which the reservoir slope is situated is intricate， influenced by factors such as precipitation and fluctuations in reservoir water levels. Furthermore， the anchoring structure embedded within the rock mass of the slope undergoes corrosion and deterioration due to these factors， resulting in a highly complex interaction process between the slope rock mass and the anchoring structure. The long-term safety of rock-anchored structure systems is closely tied to the construction and safe operation of reservoirs， as both internal and external factors play a role in ensuring their stability. The present study aims to investigate this intricate issue by designing and establishing an on-site comprehensive multi-field information monitoring platform. The multi-site information monitoring platform comprises three components， namely the landslide monitoring system， anchor structure monitoring system， and data management system. The landslide monitoring system encompasses the surveillance of surface deformation， subsurface deformation， and environmental factors. The monitoring system for anchor structures includes the monitoring of prestress， anchor cable strain， and corrosion status of steel bars. The establishment of a preliminary system for data transmission and management has been accomplished. The current monitoring results indicate that the health condition of the tested anchor cables is satisfactory， and the strain and corrosion status are influenced by the design of the anchor cable structure. The platform is currently undergoing enhancements with the incorporation of cutting-edge anchoring structure design and monitoring equipment.

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Peroxidase-like nanozyme based microenvironment-responsive injectable hydrogel for bacteria-infected wound healing

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Science China Technological Sciences 2024年

作者： ZHOU Wei LI XiaNan tang MengCheng PAN lingfeng WANG BeiBei ZHANG Hao ZHANG Han WANG ShiBo KONG XiangDong Institute of Smart Biomaterial Materials School of Materials Science and Engineering Zhejiang University of Science & Technology Zhejiang-Mauritius Joint Research Center for Biomaterials and Tissue Engineering Zhejiang University of Science & Technology

Hydrogel stands out as one of the most attractive wound dressings due to its excellent moisturizing properties and capacity to absorb wound exudates. However, conventional hydrogel dressings often lack responsiveness to the microenvironment, merely acting as protective barriers for the wound. Consequently, they exhibit limited effectiveness in preventing infection and facilitating wound repair. To address these problems, we have developed a multifunctional injectable hydrogel, CF/MS@HG, based on peroxidase-like nanozymes, aiming at rapidly healing bacterial-infected wounds. The hydrogel is mainly composed of oxidized sodium alginate, aminated gelatin, and polylysine, encapsulating MIL-101（CuFe） NPs （CF） and manganese selenide nanoparticles （MnSe2NPs, or MS NPs）. After injection, the complex rapidly gelatinizes at the infected wound site through a Schiff base reaction. In vitro experiments have demonstrated the hydrogel’s strong adhesion and self-healing ***, CF exhibiting peroxidase （POD）-like activity, catalyzes in situ hydrogen peroxide （H2O2） to generate highly toxic hydroxyl radicals （·OH） within the wound microenvironment, inducing oxidative damage to bacteria. Meanwhile, MS decomposes into H2Se in the slightly acidic wound microenvironment, disrupting bacterial metabolism and inhibiting *** addition of polylysine further enhances the hydrogel’s antibacterial properties. In vivo experiments have shown that the hydrogel exhibits excellent biological safety and significantly promotes wound healing. This multifunctional smart hydrogel holds great promise for the treatment of bacterial-infected wounds.

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空间感知通道注意力引导的高动态图像重建

中国图象图形学报 2022年第12期27卷 3581-3595页

作者：唐凌峰黄欢张亚飞李凡昆明理工大学信息工程与自动化学院昆明650500

目的通过融合一组不同曝光程度的低动态范围(low dynamic range,LDR)图像,可以有效重建出高动态范围(high dynamic range,HDR)图像。但LDR图像之间存在背景偏移和拍摄对象运动的现象,会导致重建的HDR图像中引入鬼影。基于注意力机制的HD... 详细信息

目的通过融合一组不同曝光程度的低动态范围(low dynamic range,LDR)图像,可以有效重建出高动态范围(high dynamic range,HDR)图像。但LDR图像之间存在背景偏移和拍摄对象运动的现象,会导致重建的HDR图像中引入鬼影。基于注意力机制的HDR重建方法虽然有一定效果,但由于没有充分挖掘特征空间维度和通道维度的相互关系,只在物体出现轻微运动时取得比较好的效果。当场景中物体出现大幅运动时,这些方法的效果仍然存在提升空间。为此,本文提出了空间感知通道注意力引导的多尺度HDR图像重建网络来实现鬼影抑制和细节恢复。方法本文提出了一种全新的空间感知通道注意力机制(spatial aware channel attention mechanism,SACAM),该机制在挖掘通道上下文关系的过程中,通过提取特征通道维度的全局信息和显著信息,来进一步强化特征的空间关系。这有助于突出特征空间维度与通道维度有益信息的重要性,实现鬼影抑制和特征中有效信息增强。此外,本文还设计了一个多尺度信息重建模块(multiscale information reconstruction module,MIM)。该模块有助于增大网络感受野,强化特征空间维度的显著信息,还能充分利用不同尺度特征的上下文语义信息,来重构最终的HDR图像。结果在Kalantari测试集上,本文方法的PSNR-L(peak signal to noise ratio-linear domain)和SSIM-L(structural similarity-linear domain)分别为41.1013、0.9865。PSNR-μ(peak signal to noise ratio-tonemapped domain)和SSIM-μ(structural similarity-tonemapped domain)分别为43.4136、0.9902。在Sen和Tursun数据集上,本文方法较为真实地重构了场景的结构,并清晰地恢复出图像细节,有效避免了鬼影的产生。结论本文提出的空间感知通道注意力引导的多尺度HDR图像重建网络,有效挖掘了特征中对重构图像有益的信息,提升了网络恢复细节信息的能力。并在多个数据集上取得了较为理想的HDR重建效果。

关键词：多曝光图像融合高动态范围(HDR) 注意力多尺度鬼影抑制

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中浓纸浆输送装置的流场数值模拟研究

机械科学与技术 2010年第6期29卷 759-764页

作者：唐铃凤朱涛安徽工程科技学院机械工程系先进数控和伺服驱动技术安徽省重点实验室芜湖241000 江苏江风氟合金泵阀制造有限公司靖江214536

纸浆浓度超过6%后已经没有流动性,并含有大量的气体,不可以用离心泵进行输送。为了搞清中农纸浆输送装置流场的流体压力与流速分布,对中浓浆输送装置的结构进行设计,然后以未漂白芦苇浆等中浓浆为流动介质,对搅拌装置进行流场数值模拟... 详细信息

纸浆浓度超过6%后已经没有流动性,并含有大量的气体,不可以用离心泵进行输送。为了搞清中农纸浆输送装置流场的流体压力与流速分布,对中浓浆输送装置的结构进行设计,然后以未漂白芦苇浆等中浓浆为流动介质,对搅拌装置进行流场数值模拟。根据模拟的结果,对装置进行改进设计,试制样机,并做试验测试。测试结果显示:该装置的机械运动性能稳定。结合流态化装置的模拟结果可知:该装置的性能参数很好地满足了设计要求。笔者所研究的装置,可使流动性很差的中高浓纸浆流态化,同液体一样,可通过离心泵输送到所要求的高度或所需要的压力的地方。

关键词：中浓浆泵数值模拟流态化流场