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Design and test of the key components for a combing-type tobacco harvester

International Journal of Agricultural and Biological Engineering 2024年第1期17卷 145-153页

作者： Chaoran Sun shaohui tan Songling Sun Mingtao Xiao Limei Chen Wenke Ai Zhihua Qiu Ping Jiang Yang He School of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China Truking Technology Limited Ningxiang 410600HunanChina Construction of tobacco leaf production infrastructure of Hunan Province Company of China National Tobacco Corporation office Changsha 410009China

In response to the problems of low efficiency,high labor intensity,and low mechanization in manual tobacco harvesting,a comb-off tobacco picking device for southern hilly tobacco areas was designed following the agronomic requirements and the principle of manual picking of tobacco harvesting in southern *** device was composed of the power chassis,picking mechanism,and storage *** study involved the theoretical analysis,structural design,and modeling of the key components,such as chassis structure,combing-type picking mechanism,and power synchronization *** results of the motion analysis and calculation of the picking process demonstrated that the adjustment range of the comb chain elevation angles was from 12.4°to 20.9°,the comb rod installation distance was 76.2 mm,and the synchronizing mechanism transmission ratio was 3:***-factor test and three-factor three-level orthogonal test was performed with the forward speed of the chassis,the distance between the picking device baffles and the elevation angle of the chain with the combing bar as test factors,and the rate of broken and missed tobacco picking as evaluation *** was revealed that the optimal combination of the forward speed of the chassis,the distance between the baffles,and the chain elevation angle were 1.5 km/h,75 mm,and 12.4°,***,verification tests suggested that the breakage rate of tobacco leaves was 9.99%,and the probability of missed tobacco picking was 7.31%,both of which satisfy the agriculture requirements and the operational requirements in the agricultural machinery certification syllabus.

关键词： harvesting machinery leaf tobacco combing-type tiered harvest synchronizing mechanism

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客运专线CRTS I型板式无砟轨道板场规划与设计

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城市建筑 2014年第27期11卷 47-49页

作者：谭绍辉中铁航空港集团辽宁工程有限公司沈阳110000

CRTS I型板式无砟轨道具有高平顺性、高稳定性、高舒适性、结构刚度均匀、养护维修量少等特点。因此，在世界范围内被广泛采用。本文结合哈大客运专线瓦房店轨道板场规划与设计，介绍了板场规划设计思路与原则，为类似工程提供了经验借鉴。

关键词： CRTS I型板式砟轨道哈大客运专线

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点火提前角对小缸径高转速汽油机性能的影响

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小型内燃机与车辆技术 2022年第6期51卷 13-18页

作者：任凯唐琦军谭绍辉许祥湖南农业大学机电工程学院湖南长沙410128

为了研究点火提前角对小缸径高转速汽油机性能的影响规律,对本田CBR600汽油机开展了试验研究。分别选取了发动机转速为4 000 r/min和8 000 r/min下三种不同节气门开度的工况点,开展了点火提前角在一定范围内变化的台架试验。试验数据表... 详细信息

为了研究点火提前角对小缸径高转速汽油机性能的影响规律,对本田CBR600汽油机开展了试验研究。分别选取了发动机转速为4 000 r/min和8 000 r/min下三种不同节气门开度的工况点,开展了点火提前角在一定范围内变化的台架试验。试验数据表明:在一定范围内增大点火提前角,发动机的功率、转矩、有效热效率增加;排气总管温度、排气总管余热能百分比得到下降;从总的趋势来看,点火提前角的变化对充量系数影响不大。随着点火提前角增大,4 000 r/min转速下,CO排放变化不明显,HC排放小负荷时降低、中大负荷时增加,NO_(x)排放降低;8 000 r/min转速下,CO排放小负荷时降低、中大负荷时增加,HC、NO_(x)排放均增加。

关键词：点火提前角汽油机动力性能经济性能排放性能

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基于湘农楚天赛车的制动系统设计

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汽车零部件 2024年第8期 6-10,14页

作者：马有谭绍辉欧阳斌孙超然湖南农业大学湖南长沙410128

湘农楚天赛车的制动系统是以中国大学生方程式汽车大赛的规则为前提自主设计、制造的。通过汽车制动相关理论及公式计算获得相关数据,并对制动系统的主要零部件进行选型,包括前、后轮制动卡钳及制动主缸等。采用ANSYS工程仿真软件对关... 详细信息

湘农楚天赛车的制动系统是以中国大学生方程式汽车大赛的规则为前提自主设计、制造的。通过汽车制动相关理论及公式计算获得相关数据,并对制动系统的主要零部件进行选型,包括前、后轮制动卡钳及制动主缸等。采用ANSYS工程仿真软件对关键零部件进行校核分析,经过优化进一步对该制动系统进行轻量化设计。在最终的实测中,该制动系统能够满足在紧急制动时四轮同时抱死且行驶方向不变的要求,制动性能比较可靠,能够满足大赛规则的要求。

关键词：湘农楚天赛车制动系统优化分析

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干细胞的趋电性迁移及机制

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中国组织工程研究 2025年第23期29卷 4984-4992页

作者：韩芳舒晴贾绍辉田峻武汉体育学院运动医学院湖北省武汉市430079 武汉大学中南医院骨科康复科湖北省武汉市430071

背景:随着对干细胞技术研究的深入,如何使其准确归巢成为临床应用中的一大难题。除药物和趋化因子等信号的诱导外,电场也被广泛应用于指导干细胞的定向迁移,并可增强其迁移速度和定向性。目的:旨在分析总结电场对干细胞迁移特性的影响,... 详细信息

背景:随着对干细胞技术研究的深入,如何使其准确归巢成为临床应用中的一大难题。除药物和趋化因子等信号的诱导外,电场也被广泛应用于指导干细胞的定向迁移,并可增强其迁移速度和定向性。目的:旨在分析总结电场对干细胞迁移特性的影响,同时综述可能的作用机制。方法:通过检索Pub Med和中国知网数据库,收集截至2024年3月的相关文献,英文检索词:“stem cells,direct current electric field,pulsed electric field,migration,electric field device,mechanism”;中文检索词:“干细胞,直流电场,脉冲电场,迁移,电场装置,机制”。排除不能获取全文和与主题无关的文献。结果与结论:根据筛选要求共纳入58篇文献,包括中文文献15篇及英文文献43篇。文献以脂肪间充质干细胞、骨髓间充质干细胞、神经干细胞、表皮干细胞、人胚胎干细胞和人诱导性多功能干细胞为研究对象,在迁移装置中研究电场的不同参数对上述干细胞迁移的影响及其机制。(1)电场作为一种简单、无创且稳定的干预方式在指导干细胞定向迁移的过程中起着积极作用;(2)不同类型的干细胞发生趋电性迁移的方向不同,同时大部分干细胞的迁移速度和定向性是随着电场强度增加而增加的;(3)不同的电场装置在观测干细胞迁移时的侧重点不同,可根据实验目的而择优选择相关装置;(4)不同干细胞趋电性迁移的机制不完全相同,多数干细胞迁移过程中有MAPK通路、ROCK活化以及PI3K功能的参与,同时还有其他蛋白质复合物与信号通路参与调控该过程;(5)除电场参数不同之外,细胞本身的衰老情况和培养环境也会对趋电性迁移的结果产生影响。总而言之,电场作为一种影响干细胞迁移特性的重要信号,与其他新兴材料结合在组织工程应用中展现出了一定的潜力,有望在指导干细胞归巢方面发挥更加重要的作用,促进骨组织再生和修复以及神经系统、自身免疫系统以及肿瘤等疾病的研究取得更大的突破。

关键词：干细胞电场趋电性迁移机制归巢效应物理因子电场装置细胞衰老培养环境

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Microbial synthesis of N, P co-doped carbon supported PtCu catalysts for oxygen reduction reaction

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Journal of Energy Chemistry 2023年第9期84卷 486-495页

作者： shaohui Zhang Suying Liu Jingwen Huang Haikun Zhou Xuanzhi Liu Pengfei tan Haoyun Chen Yili Liang Jun Pan State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083HunanChina State Key Laboratory of Chemo/Biosensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082HunanChina School of Minerals Processing and Bioengineering Central South UniversityChangsha 410083HunanChina School of Resources and Environment Hunan University of Technology and BusinessChangsha 410205HunanChina

Developing highly efficient and stable platinum-based electrocatalyst for oxygen reduction reaction(ORR) is critical to expediting commercialization of fuel ***,several PtCu alloy nanocatalysts supported on N,P co-doped carbon(PtCu/NPC) were prepared by microbial-sorption and *** them,PtCu/NPC-700 ℃ exhibits excellent catalytic performance for ORR with a mass activity of 0.895 A mg_(pt)^(-1)(@0.9 V) which is 8.29 folds of commercial Pt/***,the ECSA and MA of PtCu/NPC-700℃ only decrease by 14.2% and 18.7% respectively,while Pt/C decreases by 35.2% and 52.8% after 10,000 cycles of ADT ***,the PtCu/NPC-700℃ catalyst emanates a maximum power density of 715 mW cm^(-2) and only 11.1% loss of maximum power density after 10,000 ADTs in single-cell test,indicating PtCu/NPC-700℃ also manifests higher activity and durability in actual single-cell operation than Pt/*** research provides an easy and novel strategy for developing highly active and durable Pt-based alloy catalyst.

关键词： Microbial synthesis N P co-doping PtCu catalyst Oxygen reduction reaction

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Current situations,advantages/disadvantages and future developments of resilient deformation characterizations of unbound granular material:A state-of-the-art review

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第6期10卷 964-1000页

作者： shaohui Li Peiwen Hao Key Laboratory of Road Structure and Material School of HighwayChang'an UniversityXi'an 710064China Key Laboratory of Road and Traffic Engineering of Ministry of Education Tongji UniversityShanghai 201804China

A state-of-the-art review was delivered in the manuscript to analyze the current situations and the advantages/disadvantages of resilient deformation related issues to the unbound granular material(UGM),including testing methods,influencing factors and constitutive models,through which the bottlenecks in UGM resilient deformation characterizations were located and new theories and future research recommendations were *** with other testing methods,the hollow cylinder test and true triaxial test are the only two to determine the anisotropic moduli of the *** significant advantages are observed in more advanced test apparatus such as true triaxial test,further improvements should be made,such as more advanced process identification control algorithm,to more conveniently control the nine independent hydraulic system and accurately measure UGM anisotropic *** and conflicts in understanding the influencing factors to UGM resilient modulus were located,such as the stress history,the residual stress,the dry density,the gradation/fine content and the freeze-thaw cycle,based on which future research could be *** reviewing evolutions of the UGM constitutive models and comparing their representativeness and complexity comprehensively,major drawbacks were discovered and a new theory was proposed afterward to modify the UGM constitutive model,although further validations are still needed.

关键词： Unbound granular material Resilient characterization Testing method Influencing factor Constitutive model

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Using hydrochemical signatures to characterize the long-period evolution of groundwater information in the Dagu River Basin,China

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Frontiers of Environmental Science & Engineering 2021年第5期15卷 311-323页

作者： Ziyue Yin Qing Lin shaohui Xu School of Environmental Science and Engineering Qingdao UniversityQingdao266071China

The evolution of hydrochemical compositions influenced by long-period interactions between groundwater and the geo-environment is a fundamental issue for exploring groundwater quality and *** study systematically investigated the hydrochemical processes and anthropogenic interference occurring in the river basin by bivariate plots,Gibbs diagrams,saturation index,and the major ions *** changes in groundwater hydrochemistry have been observed in the study area,illustrating the origins of major ions are affected by various internal and external *** highlighted that TDS varied from freshwater to brackish water,ranging between 187.90 and 2294.81 mg/***^(2+)and HCO_(3)^(−)are the dominant ions in the studied *** results gained by Gibbs diagrams,bivariate plots,saturation index,and the major ions ratios demonstrated that minerals dissolution/precipitation,cation exchange,and human inputs play crucial roles in the unconfined ***,the overuse of nitrogen fertilizer,livestock manure,and industrial/domestic sewage led to nitrate and nitrite contamination and brought significant challenges to the surrounding *** present study could make an unambiguous identification of natural processes and anthropogenic interventions influencing groundwater hydrochemistry’s long-period evolution and create a preliminary strategy for groundwater resources management.

关键词： Groundwater quality Hydrochemical signatures Spatial-temporal variations Water-rock interactions Anthropogenic interventions

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Plume dynamics and dispersion characteristics in oil horizontal release from damaged submarine pipeline

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Chinese Journal of Chemical Engineering 2020年第5期28卷 1214-1224页

作者： Jun Zhang Hongzhou He shaohui Yang Fujian Province Key Laboratory of Energy Cleaning Utilization and Development Xiamen 361021China Key Laboratory of Ocean Renewable Energy Equipment School of Mechanical EngineeringJimei UniversityXiamen 361021China

The dynamics model of plume for underwater oil spill is improved by considering the drag force of the *** comparisons between prediction and experiment show that the improved model is *** improved model combining the Lagrangian random walk method is used to simulate the entire oil transport process from release exit to water surface in underwater oil horizontal release and some new results are ***,the release rate,the current velocity and its direction have evident influence on plume *** plume length increases as release flow rate *** small oil release rate,the plume length is very short so that the plume stage can be ignored due to the small initial *** the oil release in direction is the same as the current,the current will play a positive role in the plume motion and the plume will therefore extend a longer *** this case,the greater the current velocity is,the longer the plume extension length will *** when the oil release in direction is opposite to the current,the plume first moves forward and then is reversed to move along the opposite *** position of the reversal point depends on the current velocity and the release ***,the release rate and the current velocity also have a significant effect on oil droplet *** small oil release rate,the oil distribution area is narrow and the concentration near upper side of droplets moving path is relatively *** the release rate or current velocity increases,the oil droplet diffusion area expands away from the release ***,the movement characteristics of oil droplets in the plume and diffusion stages will affect the time and location for oil droplets reaching the *** a small release rate as well as a small current velocity,the time for oil droplet reaching surface is very short and the horizontal position reaching surface is closer to release *** this case,the time spent in the plume stage is extremely s

关键词： Submarine pipeline Plume dynamics Dispersion characteristics Simulation

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Stand basal area modelling for Chinese fir plantations using an artificial neural network model

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Journal of Forestry Research 2019年第5期30卷 1641-1649页

作者： shaohui Che Xiaohong tan Congwei Xiang Jianjun Sun Xiaoyan Hu Xiongqing Zhang Aiguo Duan Jianguo Zhang Key Laboratory of Tree Breeding and Cultivation of the State Forestry Administration Research Institute of ForestryChinese Academy of ForestryBeijing 100091People’s Republic of China Beijing Institute of Economics and Management Beijing 100091People’s Republic of China Subtropical Forestry Experimental Central Chinese Academy of ForestryFenyi 336600People’s Republic of China

Artificial neural network models are a popular estimation tool for fitting nonlinear relationships because they require no assumptions about the form of the fitting function,non-Gaussian distributions,multicollinearity,outliers and noise in the *** problems of backpropagation models using artificial neural networks include determination of the structure of the network and overlearning *** to data from 1981 to 2008 from 15 permanent sample plots on Dagangshan Mountain in Jiangxi Province,a back-propagation artificial neural network model(BPANN)and a support vector machine model(SVM)for basal area of Chinese fir(Cunninghamia lanceolata)plantations were constructed using four kinds of prediction factors,including stand age,site index,surviving stem numbers and quadratic mean *** intelligence methods,especially SVM,could be effective in describing stand basal area growth of Chinese fir under different growth conditions with higher simulation precision than traditional regression *** and the Chapman–Richards nonlinear mixed-effects model had less systematic bias than the BPANN.

关键词： Chinese fir Basal area Artificial neural network Support vector machine Mixed-effect model

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