作者： Liu, Jiangxun;Zhang, Lei;Li, Yanfei;Liu, Hui

期刊： Ecological Informatics,2023年77:102204 ISSN：1574-9541

通讯作者： Liu, H

作者机构： [Liu, Hui; Liu, Jiangxun; Zhang, Lei] Cent South Univ, Inst Artificial Intelligence & Robot IAIR, Sch Traff & Transportat Engn, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.;[Li, Yanfei] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Liu, H ] C;Cent South Univ, Inst Artificial Intelligence & Robot IAIR, Sch Traff & Transportat Engn, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.

关键词： Attention mechanism;Convolutional neural network;Marine fishery;Residual module;Target detection

摘要： Understanding the ecological environment, population abundance, and growth status of marine organisms in the marine fishery is important to promote its sustainability. However, existing manual detection methods can cause some damage to marine ecology and are difficult to meet the demand for fast and accurate detection. In addition, light, shadows, and disturbances in the marine ecosystem can affect the effectiveness of intelligent detection methods. To address these problems, a deep residual convolutional neural network (DRCNN) based on hybrid attention mechanism (HAM) is proposed to detect marine organisms. The hybrid attention mechanism obtains key information from both channel and space dimensions of the input image. And the residual module is added to the deep convolutional neural network to iteratively extract image features while avoiding error accumulation. It is demonstrated experimentally that the HAM-DRCNN model achieves 93.17% image localization accuracy with a processing speed of 20.95 frames/s. Compared with the YOLOv5 and Faster R-CNN, the mean average precision of species classification is 91.36%, which is an improvement of 0.93% and 9.39%, respectively. In addition, excellent results are achieved on two other benchmark datasets. The method can accurately locate and complete the classification of marine organisms in underwater images and has practical application value.

语种： 英文

作者： Luo, Haifeng;Xiao, Xiao;Zhang, Beibei;Li, Xu;Wu, Mingliang;...

期刊： International Journal of Vehicle Design,2022年89(1-2):1-23 ISSN：0143-3369

作者机构： [Li, Xu; Xiao, Xiao; Zhang, Beibei; Xie, Wei; Luo, Haifeng; Wu, Mingliang] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.;[Li, Xu; Xie, Wei; Luo, Haifeng; Wu, Mingliang] Hunan Prov Engn Technol Res Ctr Modern Agr Equipme, Changsha 410128, Peoples R China.;[Li, Xu; Luo, Haifeng; Wu, Mingliang] Collaborat Innovat Ctr Grain & Oil Crops South Chi, Changsha 410128, Peoples R China.

关键词： circular cutting;symmetrical hugging;intelligent synchronous control;oilseed rape;cut and windrow

摘要： An electric-drive circular-cutting and middle-placing windrower for oilseed rape is designed. Circular cutter adopts the cutting method that a chain-driven movable blade is combined with upper and lower double fixed blades, and designs a double-support circular cutter as well. Moreover, the symmetrical hugging and middle-placing reeling device is designed through artificial reeling operation. The simulated and kinematic analysis of the reeling device is done as well. The simulated analysis results show that the reeling track meets the operation requirement and the reeling devices have a good effect on the rape plants. The intelligent synchronous reeling control is designed on the reeling device drive. The field test of the prototype showed that the placing angle of the windrower was 11.48°, and the angle difference was 6.64°.This research provides theoretical and technical references for the design of the circular-cutting and middle-placing windrower for oilseed rape.

语种： 英文

作者： Chen, Lijuan;Liu, Dawei;Zhou, Jiheng*;Bin, Jun*;Li, Zhen

期刊： Analytical Letters,2021年54(6):947-965 ISSN：0003-2719

通讯作者： Zhou, Jiheng;Bin, Jun

作者机构： [Zhou, Jiheng; Chen, Lijuan] Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.;[Liu, Dawei] Hunan Agr Univ, Coll Engn, Changsha, Peoples R China.;[Bin, Jun] Guizhou Univ, Coll Tobacco Sci, Guiyang 550025, Peoples R China.;[Li, Zhen] Guizhou Tobacco Co, Qianxinan Branch, Xingyi, Peoples R China.

通讯机构： [Zhou, Jiheng] H;[Bin, Jun] G;Hunan Agr Univ, Coll Biosci & Biotechnol, Changsha, Peoples R China.;Guizhou Univ, Coll Tobacco Sci, Guiyang 550025, Peoples R China.

关键词： Calibration transfer;dimensionality reduction;near-infrared spectroscopy (NIR);neighborhood preserving embedding (NPE)

摘要： Calibration transfer is a subtle issue in the practical application of near-infrared (NIR) spectroscopy technique. In this paper, a novel method to calibration transfer based on neighborhood preserving embedding (CTNPE) for correcting spectral differences was proposed. As a manifold learning method, neighborhood preserving embedding (NPE) can not only capture the nonlinear manifold structure, but also retain the linearity and show good generalization ability. Since this approach can reveal low dimensional manifold structure in high dimensional spectroscopic data, it is beneficial to construct the transform relationship between source and target spectra. The performance of CTNPE was assessed and compared to that of piecewise direct standardization (PDS) and other four dimensionality reduction-based methods, including transfer based on target factor analysis (TTFA), spectral space transformation (SST), calibration transfer based on canonical correlation analysis (CTCCA) and based on independent component analysis (CTICA), in two real cases. The results indicated that CTNPE was able to successfully transfer spectra between instruments and samples in different physical states. Furthermore, CTNPE provided lower prediction errors than PDS, TTFA, CTCCA, SST, CTICA and direct prediction without a transfer function. Therefore, the comprehensive investigation carried out in the presented work demonstrates that CTNPE is a promising calibration transfer method for NIR, especially for correcting the variations for samples in different physical states. © 2020, © 2020 Taylor & Francis Group, LLC.

语种： 英文

作者： Yang, Lihua;Deng, Yaocheng;Gong, Daoxin*;Luo, Haifeng*;Zhou, Xuguo;...

期刊： Environmental Science and Pollution Research,2021年28(8):9582-9597 ISSN：0944-1344

通讯作者： Gong, Daoxin;Luo, Haifeng

作者机构： [Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Jiang, Fangzhou] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;[Luo, Haifeng] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.;[Zhou, Xuguo] Univ Kentucky, Dept Entomol, Lexington, KY 40546 USA.

通讯机构： [Gong, Daoxin; Luo, Haifeng] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.

关键词： Low molecular weight organic acids;Quinclorac;Sepiolite;Adsorption;Mechanism

摘要： The effects of low molecular weight organic acids (LMWOAs) on the adsorption of quinclorac by sepiolite were investigated using laboratory batch technique. Experiments were conducted with two natural sepiolite samples with different crystal structures and chemical compositions and high-purity sepiolite. The LMWOAs used were acetic, oxalic, and citric acid. And the adsorption mechanism was characterized using X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). Our analysis revealed that adsorption of quinclorac on α-sepiolite and β-sepiolite was inhibited in the presence of 4 mmol L−1 LMWOAs, whereas LMWOAs stimulated the adsorption of quinclorac in the high-purity sepiolite. Inhibition or stimulation varied across the different types of organic acids. The adsorption isotherms in the presence of 4 mmol L−1 LMWOAs were better explained by Freundlich and linear model. The effect of organic acid concentrations (0–32 mmol L−1) on the adsorption of quinclorac by the three sepiolite samples varies greatly depending on the type of organic acid and the property of sepiolite. FTIR, XRD, and XPS analyses showed that LMWOAs bound strongly to the Si–O bond structure, and Si–O-quinclorac-acetic acid (oxalic acid or citric acid) was formed on the surface of β-sepiolite. The adsorption of quinclorac by β-sepiolite was via hydrogen bond, complexation reactions, and charge transfer in the presence of LMWOAs. These results indicate that LMWOAs affect quinclorac adsorption through various interactions involving competition, electrostatic attraction, bridging action, and hydrogen bonding. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.

语种： 英文

作者： Looh, G. A.;Xie, F.*;Mangeh, F. C., III;Wang, X.

期刊： APPLIED ENGINEERING IN AGRICULTURE,2020年36(2):141-149 ISSN：0883-8542

通讯作者： Xie, F.

作者机构： [Looh, G. A.; Mangeh, F. C., III; Wang, X.] Hunan Agr Univ, Dept Agr Mechanizat Engn, Coll Engn, Changsha, Peoples R China.;[Xie, F.] Hunan Agr Univ, Coll Engn, Changsh, Peoples R China.;[Xie, F.] Ctr Southern Chinese Grain & Oilseed, Hunan Prov Key Lab Intelligent Agicultural Equipm, Changsha, Hunan, Peoples R China.;[Xie, F.] Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.

通讯机构： [Xie, F.] H;Hunan Agr Univ, Coll Engn, Changsha 410128, Peoples R China.

关键词： Assessment;Axial threshing unit;Concave clearance;Cylinder speed;Feed rate;Functional parameters;Threshing percentage

摘要： This research was conducted to assess the performance of a self-propelled mini combine harvester, model number 4LZ-0.8 under different threshing functional parameters such as cylinder speed, concave clearance, and feed rate. An indoor experiment was conducted using the mini combine with an axial flow threshing cylinder and tangential feeding of material. These functional parameters were set at 5 levels each. The responses were obtained in terms of threshing percentage, percentage of unthreshed grains and percentage of broken grains. Response values were analyzed using the response surface tool (rstool) in MATLAB. Analysis of variance was done to determine the significant effects of the factor variations on the response values. MATLAB was used to present response surface graphs that were used to describe the variations of the responses as the factors changed from one level to the other. Results showed that with an increase in cylinder speed from 697 to 1202 rpm, the percentage of broken grains increased significantly from 0.0384% to 3.4052%, respectively. At cylinder speeds of 697 and 1202 rpm, the percentage of unthreshed grains increased from 0.1515% to 0.2162%, respectively. Furthermore, an increase in feed rate decreased the threshing percentage. The highest threshing percentage was obtained at an average concave clearance of 27 mm. Furthermore, it was realized that increasing the concave clearance from 18 to 35 mm, equally increased the percentage of unthreshed grains from 0.1478% to 0.3177%. The percentage of grain damage decreased from 3.2758% to 0.0268% with an increase in concave clearance from 18 to 35 mm, respectively. From the results obtained, it was tested and suggested that operating the threshing cylinder at a cylinder speed of 1100 rpm, concave clearance of 27 mm and feed rate of 0.9 kg s-1 offered the best machine performance. At these suggested values of the operating parameters, the threshing percentage was 99.9801%, the percentage of broken grains was 0.0134%, and the percentage of unthreshed grains was 0.0199%. Copyright © 2020 American Society of Agricultural and Biological Engineers

语种： 英文

作者： Yang, Lihua;Song, Xiangxiang;Zhou, Xuguo;Zhou, Yuzhou;Zhou, Yaoyu*;...

期刊： Environmental Monitoring and Assessment,2020年192(1):62 ISSN：0167-6369

通讯作者： Zhou, Yaoyu;Gong, Daoxin

作者机构： [Yang, Danxin; Deng, Yaocheng; Gong, Daoxin; Yang, Lihua; Zhou, Yuzhou; Zhou, Yaoyu; Song, Xiangxiang; Zhou, YY; Gong, DX; Chen, Ling] Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.;[Luo, Haifeng] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Zhou, Xuguo] Univ Kentucky, Dept Entomol, Lexington, KY 40546 USA.

通讯机构： [Zhou, YY; Gong, DX] H;Hunan Agr Univ, Coll Resources & Environm, Changsha 410128, Hunan, Peoples R China.

关键词： Butralin;Degradation;Half-life;Peanut;Residue;Risk assessment

摘要： Butralin is widely used to control single-leaf weeds and some dicotyledons. The application of butralin in the environment may cause residue beyond regulation criteria and residual toxicity. Therefore, it is important to detect and supervise the dissipation behavior of butralin in edible raw food and in the environment. The aim of this study was to monitor butralin in peanuts and soil under farmland conditions and examine the likely dietary risk assessment of butralin for Chinese people on the basis of residual concentrations. A method for the analysis of butralin residue and its dissipation in peanut plants and soil under field conditions was investigated. The results show that an analytical method for the quantization of butralin in peanuts and soil utilizing gas chromatography with electron capture detection (GC-ECD) was developed. Standard recovery experiments using three different butralin spiking levels of 0.01, 0.1, and 1.0mgkg−1 in different samples (i.e., peanut kernels, shell, seedling, stalk, and soil) were conducted. The recoveries of butralin from all matrices ranged from 86 to 108% with relative standard deviations from 3 to 6% (n = 5). The limit of quantification (LOQ) of the method was 0.01mgkg−1. After storage at − 20°C for 365days, the degradation rate of residues of butralin in peanut kernels was less than 30%, which met the storage stability test criteria for pesticide residues in stored commodities of plant origin. The dissipation half-lives of butralin ranged from 4.2 to 6.6days and 4.6 to 6.6days in peanut seedlings and soil, respectively, in farmland ecosystems. At the normal harvest time, the final residue concentrations of butralin in peanuts and soil were all below the LOQ. The final total risk quotient (RQ) values were much lower than RQ = 100%, which indicated that the long-run fitness risk associated with butralin residue in different groups of registered crops is correspondingly low for people in China. The current research results could offer guidance for the rational use of butralin and provide data support for the building of maximum residue limits (MRLs) in China. © 2019, Springer Nature Switzerland AG.

语种： 英文

作者： Luo, Ya-hui;Jiang, Ping*;Xie, Kai;Wang, Fu-jie

期刊： Optical Review,2019年26(1):118-123 ISSN：1340-6000

通讯作者： Jiang, Ping

作者机构： [Xie, Kai; Luo, Ya-hui; Jiang, Ping; Wang, Fu-jie] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Jiang, Ping] Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Jiang, Ping] H;[Jiang, Ping] S;Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;Southern Reg Collaborat Innovat Ctr Grain & Oil C, Changsha 410128, Hunan, Peoples R China.

关键词： Rice blast;High spectral;Grading-detection

摘要： Rice blast is a worldwide disease of rice that is an important reason for the reduction of rice yield. In this paper, “Lingliangyou 268” was selected as the research object. The spectral data were measured by a Landmark Spectrum instrument. The spectral characteristics of the original spectrum, derivative spectrum and logarithmic spectrum of different grades of rice blast were studied. A new method for rice blast grading based on sensitive bands was proposed. Then, the method of system clustering method, BP neural network and probabilistic neural network were used to establish the rice blast classification prediction model, respectively. Comparing the three models, the classification effect based on probabilistic neural network is the best. In the training samples, the logarithmic spectral classification accuracy is 97.8%. In the test samples, the logarithmic spectral classification accuracy is 75.5%. © 2019, The Optical Society of Japan.

语种： 英文

作者： Qiu, Rangjian;Liu, Chunwei;Cui, Ningbo*;Wu, Youjie;Wang, Zhenchang;...

期刊： Agricultural Water Management,2019年224:105755 ISSN：0378-3774

通讯作者： Cui, Ningbo

作者机构： [Liu, Chunwei; Qiu, Rangjian] Nanjing Univ Informat Sci & Technol, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Sch Appl Meteorol, Jiangsu Key Lab Agr Meteorol, Nanjing 210044, Jiangsu, Peoples R China.;[Cui, Ningbo] Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Sichuan, Peoples R China.;[Cui, Ningbo] Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610065, Sichuan, Peoples R China.;[Wu, Youjie] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Wang, Zhenchang] Hohai Univ, Coll Water Conservancy & Hydropower Engn, Nanjing 210098, Jiangsu, Peoples R China.

通讯机构： [Cui, Ningbo] S;Sichuan Univ, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Sichuan, Peoples R China.;Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610065, Sichuan, Peoples R China.

关键词： Bowen ratio energy balance;Evapotranspiration partitioning;Oryza sativa;Path analysis;Triticum aestivum

摘要： The rice-wheat rotation system is one of the largest agricultural production systems worldwide. Accurate estimation of evapotranspiration (ET) in the rice-wheat rotation system is critical to enhance efficient irrigation management and water use. The variation of ET for a rice-wheat rotation system during 2015–2018 and its controlling meteorological factors was investigated using the Bowen ratio energy balance and path analysis methods. A modified Priestley–Taylor (PT) model considering soil water stress for soil evaporation (E) (fsw), and plant temperature constraint (deviation of air temperature from optimum for the crops used, ft), leaf senescence for transpiration was developed. The results showed that the diurnal variation of ET rate in different months exhibited a single peak curve with the maximum ET rates of 0.90 and 0.42 mm h−1 for rice and winter wheat, respectively. The total ET of the rice-wheat rotation system over the whole growing season was 765–841 mm, of which 63–67% was consumed by the rice field. The average daily ET rate over the whole growing season was 3.27–4.13 and 1.50-1.65 mm d−1 for rice and winter wheat, respectively. The results of ET partitioning showed that E accounted for 23–32% of the seasonal ET for rice and 48–51% for winter wheat. The ET partitioning of rice and winter wheat was closely linked to leaf area index (LAI). The ratio of E/ET reduced exponentially for rice with the increase of LAI, while it reduced linearly for winter wheat. The path analysis showed that the net radiation (Rn) was the dominant meteorological factor affecting short-term ET of the rice-wheat rotation system through the direct effect. The water vapour pressure deficit (VPD), another important factor influencing ET, showed mainly an indirect effect on ET through path of Rn and had a greater impact on ET for rice than that for wheat. The modified PT model could estimate ET for rice and winter wheat reasonably, with linear regression coefficient of 0.93–1.09 and coefficient of determination of 0.92−0.96. The model was sensitive to the fsw or ft. © 2019 Elsevier B.V.

语种： 英文

作者： Yin, Lairong;Huang, Long*;Huang, Juan*;Xu, Peng;Peng, Xuejun;...

期刊： MECHANICAL SCIENCES,2019年10(2):545-552 ISSN：2191-9151

通讯作者： Huang, Long;Huang, Juan

作者机构： [Zhang, Peng; Peng, Xuejun; Yin, Lairong; Huang, Long] Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;[Huang, Juan] Hunan Agr Univ, Coll Engn, Changsha 410012, Hunan, Peoples R China.;[Xu, Peng] Hunan Changzhong Machinery Co Ltd, Changsha 410014, Hunan, Peoples R China.;[Zhang, Peng] Changsha Univ Sci & Technol, Hunan Prov Key Lab Intelligent Mfg Technol High P, Changsha 410114, Hunan, Peoples R China.

通讯机构： [Huang, Long] C;[Huang, Juan] H;Changsha Univ Sci & Technol, Sch Automot & Mech Engn, Changsha 410114, Hunan, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha 410012, Hunan, Peoples R China.

摘要： In this paper, a synthesis method is proposed for the 5-point-contact four-bar linkage that approximates a straight line with given angle parameters. The given parameters were the angles and the location of the Ball point. Synthesis equations were derived for a general Ball-Burmester point case, the Ball-Burmester point at an inflection pole, and the Ball point that coincided with two Burmester points, resulting in three respective groups of bar linkages. Next, taking Ball-Burmester point as the coupler point, two out of the three bar-linkage combinations were used to generate three four-bar mechanisms that shared the same portion of a rectilinear trajectory. Computation examples were presented, and nine cognate straight-line mechanisms were obtained based on the Roberts-Chebyshev theory. Considering that the given parameters were angles which was arbitrarily chosen, with the other two serving as the horizontal and vertical axes, so the solution region graphs of the solutions for three mechanism configurations were plotted. Based on these graphs, the distribution of the mechanism attributes was obtained with high efficiency. By imposing constraints, the optimum mechanism solution was straightforwardly identified by the designers. For the angular parameters prescribed in this paper, the solutions for three straight-line mechanism configurations were obtained, along with nine cognate straight-line mechanisms that shared the same portion of the rectilinear trajectory. All the fixed pivot installation locations and motion performances differed, thus providing multiple solutions to the trajectory of the synthesis of mechanisms.

语种： 英文

作者： Zhang, Liang;Zhang, Hongduo;Chen, Yedong;Dai, Sihui;Li, Xumeng*;...

期刊： 国际农业与生物工程学报(英文),2019年12(1):6-9 ISSN：1934-6344

通讯作者： Li, Ming;Li, Xumeng

作者机构： [Li, Ming; Zhang, Liang; Chen, Yedong; Zhang, Hongduo] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Liu, Zhonghua; Dai, Sihui] Hunan Agr Univ, Coll Hort & Landscape, Changsha 410128, Hunan, Peoples R China.;[Li, Xumeng] Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.;[Imou, Kenji] Univ Tokyo, Grad Sch Agr & Life Sci, Dept Biol & Environm Engn, Tokyo 1130033, Japan.;[Li, Ming] Shandong Univ Technol, Sch Agr Engn & Food Sci, Zibo 255000, Peoples R China.

通讯机构： [Li, Ming; Li, Xumeng] H;Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Coll Agr, Changsha 410128, Hunan, Peoples R China.

关键词： Agricultural machinery;Fresh tea leaves;Intelligent recognition;Machine vision;Real-time monitoring

摘要： The harvesting time of fresh tea leaves has a significant impact on product yield and quality. The aim of this study was to propose a method for real-time monitoring based on machine vision to determine the optimum harvesting time for picking fresh tea leaves. Firstly, the shapes of fresh tea leaves were distinguished from RGB images of the tea-tree canopy after graying with the improved B-G algorithm, filtering with a median filter algorithm, binary processing with the Otsu algorithm, and noise reduction and edge smoothing using open and close operations. Then the leaf characteristics, such as leaf area index, average length, and leaf identification index, were calculated. Based on these, the Bayesian discriminant principle and method were used to construct a discriminant model for fresh tea-leaf collection status. When this method was applied to a RGB tea-tree canopy image acquired at 45°shooting angle, the fresh tea-leaf recognition rate was 90.3%, and the accuracy for fresh tea-leaf harvesting status was 98% by cross validation. Hence, this method provides the basic conditions for future tea-plantation operation and management using information technology, automation, and intelligent systems. © 2018, ABE Publishing.

语种： 英文

作者： Duan, Xiongbo;Liu, Yiqun;Liu, Jingping*;Lai, Ming-Chia*;Jansons, Marcis;...

期刊： Energy Conversion and Management,2019年195:1319-1333 ISSN：0196-8904

通讯作者： Liu, Jingping;Lai, Ming-Chia

作者机构： [Liu, Jingping; Zhang, Shiheng; Duan, Xiongbo] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Liu, Yiqun; Jansons, Marcis; Duan, Xiongbo; Lai, Ming-Chia] Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA.;[Guo, Genmiao] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Jiangsu, Peoples R China.;[Tang, Qijun] Hunan Agr Univ, Coll Engn, Changsha 410000, Hunan, Peoples R China.

通讯机构： [Liu, Jingping] H;[Lai, Ming-Chia] W;Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;Wayne State Univ, Dept Mech Engn, Detroit, MI 48202 USA.

关键词： High-pressure EGR;Hydrogen-enriched natural gas engine;Internal EGR;Low-pressure EGR;Pressure wave

摘要： In this study, a detailed 1D simulation model of the hydrogen-enriched natural gas SI engine was built according to realistic engine layout in the lab with practical boundary conditions, and validated against the experimental data. Four different types of EGR systems were comprehensively investigated, including a low-pressure (LP) EGR, a high-pressure (HP) EGR, their combinations, and an internal EGR, using the validated 1D simulation model of the hydrogen-enriched natural gas SI engine for their combustion, performance, and emissions characteristics. The results indicated that the peak combustion pressure of the in-cylinder pressure decreased with increase in EGR ratio either using the HP, LP, or combined HP-LP systems. The NOx emissions with the HP EGR were observed to be lowest of all types of EGR systems. Combined the 10% HP EGR ratio with the 5% LP EGR ratio (total 15% EGR ratio) was predicted to achieve the highest indicated thermal efficiency compared with other EGR strategies. As for the internal EGR, the peak combustion pressure and the heat release rate slightly increased with decrease in the valve overlap. Moreover, the indicated thermal efficiency firstly increased with decrease in overlap and then slightly declined. The internal EGR was mainly determined by the timing of the exhaust valve closing; However, it was not the only influence factor. The positive and negative waves in the intake and exhaust systems also played a crucial role in the gas exchange process and volumetric efficiency. © 2019 Elsevier Ltd

语种： 英文

作者： Zhou, Shengchao*;Li, Xueping;Zhang, Kaike;Du, Ni

期刊： Applied Mathematical Modelling,2019年73:1-18 ISSN：0307-904X

通讯作者： Zhou, Shengchao

作者机构： [Zhou, Shengchao] Cent South Univ Forestry & Technol, Sch Logist, Changsha 410004, Hunan, Peoples R China.;[Zhang, Kaike; Li, Xueping] Univ Tennessee, Dept Ind & Syst Engn, Knoxville, TN 37996 USA.;[Du, Ni] Hunan Agr Univ, Sch Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Zhou, Shengchao] C;Cent South Univ Forestry & Technol, Sch Logist, Changsha 410004, Hunan, Peoples R China.

关键词： Two-dimensional knapsack problem;Block packing;Bin packing problem;Integer linear programming

摘要： We study the two-dimensional knapsack problem with block packing constraints that is originated from an agricultural company when placing its seed experiments into test fields. The problem extends the classical knapsack problem by considering a block packing requirement. In this problem, a single bin is divided into many disjoint blocks and each block is a union of rectangles. If an item is placed, it should be contained in one of the blocks. The objective is to select a subset of the items to be packed into the bin to maximize the space usage, or equivalently, to minimize the wasted space. We propose three types of mathematical models for addressing the problem. The efficiency of the proposed models is analyzed through numerical studies. © 2019 Elsevier Inc.

语种： 英文

作者： Liu, Hui*;Mi, Xiwei;Li, Yanfei;Duan, Zhu;Xu, Yinan

期刊： Renewable Energy,2019年143:842-854 ISSN：0960-1481

通讯作者： Liu, Hui

作者机构： [Duan, Zhu; Liu, Hui; Mi, Xiwei; Xu, Yinan] Cent S Univ, Sch Traff & Transportat Engn, IAIR, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.;[Li, Yanfei] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Liu, Hui] C;Cent S Univ, Sch Traff & Transportat Engn, IAIR, Key Lab Traff Safety Track,Minist Educ, Changsha 410075, Hunan, Peoples R China.

关键词： Wind speed forecasting;Singular spectrum analysis;Convolutional gated recurrent unit network;Support vector regression;Time series;Deep learning

摘要： Wind speed forecasting can effectively improve the safety and reliability of wind energy generation system. In this study, a novel hybrid short-term wind speed forecasting model is proposed based on the SSA (Singular Spectrum Analysis) method, CNN (Convolutional Neural Network) method, GRU (Gated Recurrent Unit) method and SVR (Support Vector Regression) method. In the proposed SSA-CNNGRU-SVR model, the SSA is used to decompose the original wind speed series into a number of components as: one trend component and several detail components; the CNNGRU is used to predict the trend component, while the SVR is used to predict the detail components. To investigate the prediction performance of the proposed model, several models are used as the benchmark models, including the ARIMA model, PM model, GRU model, LSTM model, CNNGRU model, hybrid SSA-SVR model and hybrid SSA-CNNGRU model. The experimental results show that: in the proposed model, the CNNGRU can have good prediction performance in the main trend component forecasting, the SVR can have good prediction performance in the detail components forecasting, and the proposed model can obtain good results in wind speed forecasting. (C) 2019 Elsevier Ltd. All rights reserved.

语种： 英文

作者： Han, Xiongzhe*;Thomasson, J. Alex;Xiang, Yang;Gharakhani, Hussein;Yadav, Pappu K.;...

期刊： Sensors,2019年19(13):2852 ISSN：1424-3210

通讯作者： Han, Xiongzhe

作者机构： [Han, Xiongzhe; Yadav, Pappu K.; Thomasson, J. Alex; Gharakhani, Hussein] Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX 77843 USA.;[Xiang, Yang] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Rooney, William L.] Texas A&M Univ, Dept Soil & Crop Sci, College Stn, TX 77843 USA.

通讯机构： [Han, Xiongzhe] T;Texas A&M Univ, Dept Biol & Agr Engn, College Stn, TX 77843 USA.

关键词： ground control points;unmanned aerial vehicle;wireless network;radiometric calibration;height calibration

摘要： Ground control points (GCPs) are commonly used for georeferencing in remote sensing. Precise position measurement of the GCPs typically requires careful ground surveying, which is time-consuming and labor-intensive and thus excessively costly if it needs to be repeated multiple times in a season. A system of multifunctional GCPs and a wireless network for communication with an unmanned aerial vehicle (UAV) was developed to improve the speed of GCP setup and provide GCP data collection in real-time during the flight. While testing the system, a single-board computer on a fixed-wing UAV used in the study successfully recorded position data from all the GCPs during the flight. The multifunctional GCPs were also tested for use as references for calibration of reflectance and height for field objects like crops. The test of radiometric calibration resulted in an average reflectance error of 2.0% and a strong relationship (R2 = 0.99) between UAV-based estimates and ground reflectance. Furthermore, the average height difference between UAV-based height estimates and ground measurements was within 10 cm. © 2019 by the authors. Licensee MDPI, Basel, Switzerland.

语种： 英文

作者： Duan, Xiongbo;Liu, Jingping*;Yuan, Zhipeng;Guo, Genmiao;Liu, Qi;...

期刊： Energy,2018年165:455-470 ISSN：0360-5442

通讯作者： Liu, Jingping

作者机构： [Guan, Jinhuan; Liu, Jingping; Duan, Xiongbo; Yuan, Zhipeng; Liu, Qi] Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.;[Guo, Genmiao] Jiangsu Univ, Sch Energy & Power Engn, Zhenjiang 212013, Peoples R China.;[Tang, Qijun] Hunan Agr Univ, Coll Engn, Changsha 410000, Hunan, Peoples R China.;[Deng, Banglin] Shenzhen Univ, Coll Mech & Control Engn, Shenzhen 578060, Peoples R China.

通讯机构： [Liu, Jingping] H;Hunan Univ, State Key Lab Adv Design & Mfg Vehicle Body, Changsha 410082, Hunan, Peoples R China.

关键词： Blend fuel;Combustion phrasing;Cyclic variability;DISI engine;Injection strategies

摘要： In this study, the main objective of the work was to evaluate the injection strategies on the cycle-to-cycle variations of a turbocharged DISI engine fueled with ethanol and gasoline blend by using single injection (SI) and two-stagnation injection strategy (TSIS) modes, respectively. Two-stagnation injection strategy modes were adopted to control the first injection and the later second injection by changing the injection timing or the second fuel mass repartition. The cycle-to-cycle variations of the in-cylinder pressure, peak pressure and its location, maximum rate of pressure rise and its location, indicated mean effective pressure and combustion phasing were statistically analyzed and comprehensively compared with various injection strategies. Results showed that employing TSIS 3 mitigated the in-cylinder pressure fluctuation and concentrated the integral heat release compared with other injection strategies. Meanwhile, adopting TSIS 3 obtained the lowest COVPP (5.63%) and achieved the frequency distributions of peak pressure histograms in a relatively narrow range. Furthermore, the cycle-to-cycle variations of the 10–90% combustion duration were relatively small and less sensitive to change the injection strategy modes. Finally, employing TSIS 3 was proved to be the optimal injection strategy for achieving the lowest COVIMEP while obtaining the highest IMEP. © 2018 Elsevier Ltd

语种： 英文

作者： Xie, Huahui;Gong, Guangcai*;Wu, Yi;Liu, Yongchao;Wang, Yingjuan

期刊： Applied Sciences-Basel,2018年8(3):430- ISSN：2076-3417

通讯作者： Gong, Guangcai

作者机构： [Xie, Huahui; Wang, Yingjuan; Gong, Guangcai; Liu, Yongchao] Hunan Univ, Coll Civil Engn, Changsha 410006, Hunan, Peoples R China.;[Wu, Yi] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Gong, Guangcai] H;Hunan Univ, Coll Civil Engn, Changsha 410006, Hunan, Peoples R China.

关键词： composite hygroscopic material;building envelope;microstructure;hygroscopicity;multi-climatic region;thermal and humidity environment

摘要： Indoor air humidity is closely related to daily life and productivity. It is necessary to develop new materials which can maintain the indoor humidity environment steady within an acceptable range of 40-70%. In this paper a new composite hygroscopic material composed of wood fibre and sepiolite with expanded perlite (CHM-WSE) is used in a building envelope to evaluate its moisture buffering performance. A series of experiments assessing the microstructure, hygroscopicity, mechanical and thermodynamic properties of the new composite hygroscropic material have been executed. Furthermore, a numerical model for predicting the influence of humidity environment and energy consumption on composite hygroscopic mortar in different climatic regions has been established. The experiments show that the indoor moisture buffering performance in late spring is better than that in winter, when the practical moisture buffering performance can reach at 0.89 g/(m2%RH)@8/16h; and the non-uniformity coefficient of indoor relative humidity is about 0.006. The simulation results show that a room with CHM-WSE is more comfortable than a common mortar (CM) room, and it has better energy-saving performance in the hot summer and cold winter (HSCW) region in China. The experiments and simulations show that the developed hygroscopic material could be feasible for application in buildings. © 2018 by the authors.

语种： 英文

作者： Du, Ni*;Han, Qinglan

期刊： ASIA-PACIFIC JOURNAL OF OPERATIONAL RESEARCH,2018年35(5):1850036:1-1850036:41 ISSN：0217-5959

通讯作者： Du, Ni

作者机构： [Han, Qinglan; Du, Ni] Cent S Univ, Sch Business, Changsha 410083, Hunan, Peoples R China.;[Du, Ni] Hunan Agr Univ, Coll Engn, Changsha, Hunan, Peoples R China.

通讯机构： [Du, Ni] C;[Du, Ni] H;Cent S Univ, Sch Business, Changsha 410083, Hunan, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha, Hunan, Peoples R China.

关键词： Logistics service supply chain;pricing;service quality defect rate guarantee;fairness concerns;Stackelberg game

摘要： Although existing contributions that explore service quality guarantee problem of a logistic service supply chain (LSSC) consider fairness concern behavior of one member, little attention is paid to considering the combination of members' fairness concern and the joint decision of pricing and service quality guarantee in LSSC. Therefore, it is necessary to research how different fairness concern affects the joint decision of pricing and service quality guarantee in an LSSC. First considering a price and quality-sensitive logistics service market, a basic model without fairness concern of a customized LSSC is established. Then, a new model with fairness concern of a decentralized LSSC is constructed based on the basic model. The optimal decision of the LSSC with fairness concern is investigated in three cases. In each case, we analyze the effect of fairness concern on the optimal decision, and the expected profits and utilities. Finally, some numerical studies are shown to verify our theoretical analyses and some managerial insights are given. © 2018 World Scientific Publishing Co.

语种： 英文

作者： Zhou, Shengchao;Xie, Jianhui*;Du, Ni;Pang, Yan

期刊： Applied Mathematics and Computation,2018年334:254-268 ISSN：0096-3003

通讯作者： Xie, Jianhui

作者机构： [Pang, Yan; Zhou, Shengchao] Cent South Univ Forestry & Technol, Sch Logist, Changsha 410004, Hunan, Peoples R China.;[Xie, Jianhui] Sun Yat Sen Univ, Lingnan Coll, Guangzhou 510275, Guangdong, Peoples R China.;[Du, Ni] Hunan Agr Univ, Sch Engn, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Xie, Jianhui] S;Sun Yat Sen Univ, Lingnan Coll, Guangzhou 510275, Guangdong, Peoples R China.

关键词： Scheduling;Unrelated parallel machines;Batch processing machines;Random-keys genetic algorithm

摘要： A batch processing machine (BPM) can simultaneously process several jobs and has wide applications in various industrial environments. This paper studies the problem of minimizing makespan on unrelated parallel BPMs with non-identical job sizes and arbitrary release times. In the environment of unrelated machines, each machine has a processing speed for each job. The unrelated BPM problem is the most general case of parallel BPM problems and is closer to actual production conditions. The problem under study is NP-hard. We present two lower bounds for the problem. Then a genetic algorithm based on random-keys encoding is proposed to solve the problem. The performance of the proposed algorithm is compared with a commercial solver (ILOG CPLEX) and two meta-heuristics published in the literature: a recent iterated greedy algorithm and a particle swarm optimization algorithm. Computational experiments show that the proposed algorithm produces better solutions compared to the other methods. The quality of the proposed lower bounds is evaluated as well. © 2018 Elsevier Inc.

语种： 英文

作者： Zhang, Licheng;Huang, Wei;Xiao, Weihua;Hu, Deyong;Shao, Jihai*;...

期刊： International Journal of Agriculture and Biology,2018年20(8):1801-1808 ISSN：1560-8530

通讯作者： Shao, Jihai;Yao, Bangsong

作者机构： [Shao, Jihai; Yao, BS; Xiao, Weihua; Zhang, Licheng; Yao, Bangsong] Hunan Agr Univ, Coll Resources & Environm Sci, Changsha 410128, Hunan, Peoples R China.;[Xiao, Weihua; Huang, Wei; Hu, Deyong; Zhang, Licheng; Yao, Bangsong] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Shao, Jihai] Hunan Agr Univ, Collaborat Innovat Ctr Grain & Oil Crops South Ch, Changsha 410128, Hunan, Peoples R China.

通讯机构： [Shao, JH; Yao, BS; Yao, Bangsong; Shao, Jihai] H;Hunan Agr Univ, Coll Resources & Environm Sci, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;Hunan Agr Univ, Collaborat Innovat Ctr Grain & Oil Crops South Ch, Changsha 410128, Hunan, Peoples R China.

关键词： Continuous cropping;Crop rotation;High throughput sequencing;Microbial community structure;Soil enzyme activity;Soil microorganism diversity

摘要： Rice (Oryza sativa L.)-rapeseed (Brassica campestris L.) intercropping is a routine farming practice in Southern China, and its advantages include more efficient and productive land use as well as an improved soil environment. Field experiments were carried out on two cropping systems (rapeseed-rice rotation and rice-rice continuously) between July 2015 and October 2015. Laboratory tests were conducted to compare rapeseed-rice rotation with rice-rice continuous cropping as the control to investigate enzyme activity and the structure of bacterial communities in the soils. Two sets of soil samples were collected and tested to show that, compared to rice-rice, the catalase, urease, phosphatase and cellulase contents of the soil from rapeseed-rice rotation are increased by 11.92, 24.94, 18.80 and 20.34%, respectively, and the sucrase content decreased by 17.93%. DNA from soil microbial communities was extracted for analysis of microbial diversity using the high-throughput sequencing technique. Microbial communities in the rapeseed-rice soil were significantly different in composition to those in the rice-rice soil. Crop rotation increased the size of bacterial populations and altered their proportionality in the bacterial community and decreased the population size of Chlorobi and Chloroflexi. Canonical correspondence analysis showed that there are significant differences in bacterial population size between the two cropping systems. Firmicutes, Latescibacteria, Verrucomicrobia, Gemmatimonadetes and Acidobacteria were the principal driving force microorganisms. Rape-rice soil showed more Firmicutes and Latescibacteria in the July samples and Gemmatimonadetes and Acidobacteria in the October samples whereas the rice-rice soil showed more Verrucomicrobia and Gemmatimonadetes in the July samples and Latescibacteria and Verrucomicrobia in the October samples. These results suggest that in comparison with a rice-rice planting system, long-term rapeseed-rice rotation changes the composition and structure of microbial communities, affects soil enzyme activity, supports a more abundant and diverse microbial population, and consequently maintains higher soil quality and fertility. © 2018 Friends Science Publishers.

语种： 英文

作者： Wu, Youjie;Du, Taisheng*;Yuan, Yusen;Shukla, Manoj K.

期刊： Scientific Reports,2018年8(1):14113 ISSN：2045-2322

通讯作者： Du, Taisheng

作者机构： [Wu, Youjie] Hunan Agr Univ, Coll Engn, Changsha 410128, Hunan, Peoples R China.;[Wu, Youjie; Du, Taisheng; Yuan, Yusen] China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China.;[Shukla, Manoj K.] New Mexico State Univ, Plant & Environm Sci Dept, Las Cruces, NM 88003 USA.

通讯机构： [Du, Taisheng] C;China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China.

摘要： Deficit irrigation has usually improved crop water use efficiency (WUE), but there are still gaps in our understanding of the mechanisms. Four irrigation treatments were a conventional furrow irrigation (CFI), border irrigation (BI), alternate furrow irrigation (AFI), and an AFI(M/2) (the amount of irrigation was 50% of the AFI). The volume of irrigation water applied were nearly the same for CFI, BI, and AFI. The isotope (δ18O and δD) method was used to quantify corn root water uptake (RWU) during 2013–2014. Compared to CFI and BI, corn yield and WUE were 17.0-30.2% and 13.3-33.8% higher in AFI, respectively. No significant yield reduction were observed between AFI and AFI(M/2). Corn RWU was more from deeper soil with increasing growth stage for AFI(M/2), AFI, and CFI, but from shallower depth for BI. The depth for RWU varied in the order of AFI(M/2) > AFI > CFI > BI. The maximum root density was in the depth of 40–80 cm at the growing stage in AFI, and 4–26% more water was extracted from the wetter and deeper root zones. The WUE increased under deficit irrigation, and stimulated the root growth with attendant decreases in water loss to deep percolation. © 2018, The Author(s).

语种： 英文