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Experimental investigation on the spray characteristics of agricultural full-cone pressure swirl nozzle 农用全锥压力旋流喷嘴喷雾特性试验研究
2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231604.7088
Xiuyun Xue, Xufeng Xu, Shilei Lyu, Shuran Song, Xin Ai, Nengchao Li, Zhenyu Yang, Zhen Li
The spray characteristics of a full-cone pressure swirl nozzle have been investigated in this study. The results were defined by Reynolds number, which focuses on the breakup of liquid film, droplet size, velocity, and liquid volume flux under different Reynolds numbers at the near-field spray. The spray structure was visualized using a high-speed camera, and the characteristics of droplets were measured using a Phase Doppler Anemometer (PDA) in both the radial and axial directions. The tests were carried out at varying spray pressures (0.2 to 1.0 MPa), corresponding to different Reynolds numbers (5369 to 12006). It was found that when the Reynolds number rises, the liquid became more unstable after leaving the nozzle, causing the liquid film to break up faster. According to the measurements of PDA, the coalescence of droplets increased due to the centrifugal effect. What’s more, the velocity of the droplets fluctuates significantly in the radial direction, and the droplets with a smaller particle size had a higher average velocity. From the perspective of liquid distribution, the increase in Reynolds number caused the spray liquid to move in the radial direction gradually. In contrast, the liquid volume distribution changed in the radial direction more obviously than in the axial direction, growing to the maximum along the radial direction and gradually reducing. It can provide a reference for selecting operating parameters for actual agricultural spray operations and the design of electrostatic nozzles through the research on breakup and droplet characteristics. Keywords: full-cone pressure swirl nozzle, droplet size, droplet velocity, liquid volume flux, high-speed camera, PDA DOI: 10.25165/j.ijabe.20231604.7088 Citation: Xue X Y, Xu X F, Lyu S L, Song S R, Ai X, Li N C, et al. Experimental investigation on spray characteristics of agricultural full-cone pressure swirl nozzle. Int J Agric & Biol Eng, 2023; 16(4): 29–40.
对全锥压力旋流喷嘴的喷雾特性进行了研究。结果用雷诺数来定义,重点研究了不同雷诺数下近场喷雾液膜破裂、液滴大小、速度和液体体积通量。利用高速摄像机对喷雾结构进行了可视化,并利用相位多普勒风速仪(PDA)在径向和轴向测量了液滴的特性。试验在不同的喷射压力(0.2至1.0 MPa)下进行,对应于不同的雷诺数(5369至12006)。研究发现,当雷诺数升高时,液体离开喷嘴后变得更加不稳定,导致液膜破裂速度加快。根据PDA的测量,由于离心效应,液滴的聚并增加。此外,液滴的速度在径向上波动较大,粒径越小的液滴平均速度越高。从液体分布来看,雷诺数的增加使喷雾液体逐渐向径向运动。相比之下,液体体积分布在径向上的变化比在轴向上的变化更明显,沿径向增长到最大,然后逐渐减小。通过对喷雾破碎和雾滴特性的研究,可以为实际农业喷雾作业的操作参数选择和静电喷嘴的设计提供参考。关键词:全锥压力旋流喷嘴,液滴尺寸,液滴速度,液体体积通量,高速相机,PDA DOI: 10.25165/ j.j ijabe.20231604.7088引用本文:薛学勇,徐晓峰,吕树林,宋树荣,艾旭,李乃春,等。农用全锥压力旋流喷嘴喷雾特性试验研究。农业与生物工程学报,2023;16(4): 29-40。
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引用次数: 0
Efficient harvesting of green microalgae cells by magnetic flocculated Fe3O4 nanoparticles combined with chitosan 磁絮凝Fe3O4纳米颗粒与壳聚糖复合高效收获绿色微藻细胞
2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231604.7809
Sifen Liu, Suping Fu, Zhongjie Wen, Xiang Wang, Tianjiu Jiang, Hongye Li
Microalgae harvesting remains a challenging step in microalgae industrialization, thereby provoking the necessity to explore sustainable and economically feasible approaches. This research investigated the use of magnetic flocculated nanoparticles in the harvesting of the common microalgae Chlorella pyrenoidosa and Scenedesmus obliquus. The results showed that magnetic flocculated nanoparticles efficiently adsorbed negatively charged microalgae cells, and a magnetic field could adsorb the magnetic flocculated nanoparticles, thereby harvesting the microalgae cells. Harvesting efficiency was remarkably increased at the optimum magnetic field strength of 0.5 T with the magnetic flocculated nanoparticles at 0.738 g/L, and microalgae broth at pH 9.0, whereas the recovery rates of both C. pyrenoidosa and S. obliquus were around 97% and the sedimentation speed of both was above 2.63 cm/min. This study exemplified the magnetic flocculated nanoparticles-based approach to effectively harvest the microalgae cells. Keywords: magnetic flocculated nanoparticles, Chlorella pyrenoidosa, Scenedesmus obliquus, recovery rate, sedimentation speed DOI: 10.25165/j.ijabe.20231604.7809 Citation: Liu S F, Fu S P, Wen Z J, Wang X, Jiang T J, Li H Y. Efficient harvesting of green microalgae cells by magnetic flocculated Fe3O4 nanoparticles combined with chitosan. Int J Agric & Biol Eng, 2023; 16(4): 215-221
微藻收获仍然是微藻产业化的一个具有挑战性的步骤,因此有必要探索可持续和经济上可行的方法。本研究研究了磁性絮凝纳米颗粒在常见微藻小球藻(Chlorella pyrenoidosa)和斜状小球藻(Scenedesmus obliquus)收获中的应用。结果表明,磁性絮凝纳米颗粒能有效吸附带负电荷的微藻细胞,磁场可以吸附磁性絮凝纳米颗粒,从而收获微藻细胞。在最佳磁场强度为0.5 T、磁絮凝纳米颗粒浓度为0.738 g/L、微藻培养液pH为9.0的条件下,收获效率显著提高,pyrenoidosa和S. obliquus的回收率均在97%左右,沉降速度均在2.63 cm/min以上。本研究以磁性絮凝纳米颗粒为基础,实现了微藻细胞的有效收获。关键词:磁絮凝纳米颗粒,核核小球藻,斜状小球藻,回收率,沉降速度[DOI: 10.25165/ j.j ijaba .20231604.7809]引用本文:刘树峰,傅淑萍,文志军,王鑫,蒋天军,李海燕。磁絮凝Fe3O4纳米颗粒与壳聚糖复合高效收获绿色微藻细胞。农业与生物工程学报,2023;16 (4): 215 - 221
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引用次数: 0
Experimental and numerical study on the shrinkage-deformation of carrot slices during hot air drying 热风干燥过程中胡萝卜片收缩变形的实验与数值研究
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231601.6736
Dalong Jiang, Congcong Li, Zifan Lin, Yun-tian Wu, Hongjuan Pei, M. Zielińska, Hongwei Xiao
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引用次数: 1
Recognition of field roads based on improved U-Net++ Network 基于改进U-Net++网络的野外道路识别
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231602.7941
Lili Yang, Yuanbo Li, Mengshuai Chang, Yuanyuan Xu, Bingbing Hu, Xinxin Wang, Caicong Wu
: Unmanned driving of agricultural machinery has garnered significant attention in recent years, especially with the development of precision farming and sensor technologies. To achieve high performance and low cost, perception tasks are of great importance. In this study, a low-cost and high-safety method was proposed for field road recognition in unmanned agricultural machinery. The approach of this study utilized point clouds, with low-resolution lidar point clouds as inputs, generating high-resolution point clouds and Bird's Eye View (BEV) images that were encoded with several basic statistics. Using a BEV representation, road detection was reduced to a single-scale problem that could be addressed with an improved U-Net++ neural network. Three enhancements were proposed for U-Net++: 1) replacing the convolutional kernel in the original U-Net++ with an Asymmetric Convolution Block (ACBlock); 2) adding a multi-branch Asymmetric Dilated Convolutional Block (MADC) in the highest semantic information layer; 3) adding an Attention Gate (AG) model to the long-skip-connection in the decoding stage. The results of experiments of this study showed that our algorithm achieved a Mean Intersection Over Union of 96.54% on the 16-channel point clouds, which was 7.35 percentage points higher than U-Net++. Furthermore, the average processing time of the model was about 70 ms, meeting the time requirements of unmanned driving in agricultural machinery. The proposed method of this study can be applied to enhance the perception ability of unmanned agricultural machinery thereby increasing the safety of field road driving.
近年来,随着精准农业和传感器技术的发展,农业机械的无人驾驶受到了广泛关注。为了实现高性能和低成本,感知任务非常重要。本研究提出了一种低成本、高安全性的无人农机现场道路识别方法。本研究方法利用点云,以低分辨率激光雷达点云为输入,生成高分辨率点云和用几种基本统计编码的鸟瞰(BEV)图像。使用BEV表示,道路检测被简化为一个单尺度问题,可以通过改进的U-Net++神经网络来解决。针对U-Net++提出了三个改进方案:1)用非对称卷积块(ACBlock)取代原始U-Net++中的卷积核;2)在最高语义信息层增加多分支非对称扩展卷积块(MADC);3)在解码阶段为长跳接增加注意门(Attention Gate, AG)模型。本研究的实验结果表明,我们的算法在16通道点云上实现了96.54%的average Intersection Over Union,比U-Net++提高了7.35个百分点。模型的平均处理时间约为70 ms,满足农业机械无人驾驶的时间要求。本文提出的方法可用于增强无人农机的感知能力,从而提高田间道路行驶的安全性。
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引用次数: 0
Design of a fixed-pipe cold aerosol spraying system for chemical application in greenhouse 温室化工用固定管冷喷雾系统的设计
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231601.6573
Shilin Wang, Daipeng Lu, Xue Li, Xiaohui Lei, Yuxin Tang, Xiaolan Lyu
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引用次数: 0
Integrating field images and microclimate data to realize multi-day ahead forecasting of maize crop coverage using CNN-LSTM 整合田间图像和小气候数据,利用CNN-LSTM实现玉米作物覆盖多日预报
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231602.7020
Xin Wang, Yu Yang, Xin Zhao, Min Huang, Qibing Zhu
: Crop coverage (CC) is an important parameter to represent crop growth characteristics, and the ahead forecasting of CC is helpful to track crop growth trends and guide agricultural management decisions. In this study, a novel CNN-LSTM model that combined the advantages of convolutional neural network (CNN) in feature extraction and long short-term memory (LSTM) in time series processing was proposed for multi-day ahead forecasting of maize CC. Considering the influence of climate change on maize growth, five microclimatic factors were combined with historical maize CC estimated from field images as the input variables of the forecasting model. The field experimental data of four observation points for more than three years were used to evaluate the performance of CNN-LSTM at the forecasting horizon of three to seven days ahead and compared the forecasting results to CNN and LSTM. The results demonstrated that CNN-LSTM obtained the lowest RMSE and the highest R 2 at all forecasting horizons. Subsequently, the performance of CNN-LSTM under univariate (historical maize CC) and multivariate (historical maize CC+microclimatic factors) input was compared, and the results indicated that additional microclimatic factors were effective in improving the forecasting performance. Furthermore, the 3-day ahead forecasting results of CNN-LSTM in different growth stages of maize were also analyzed, and the results showed that the highest forecasting accuracy was obtained in the seven leaves stage. Therefore, CNN-LSTM can be considered a useful tool to forecast maize CC.
:作物盖度是表征作物生长特征的重要参数,对作物盖度进行前瞻性预测有助于跟踪作物生长趋势,指导农业经营决策。本研究结合卷积神经网络(CNN)在特征提取方面的优势和时间序列处理方面的长短期记忆(LSTM)优势,提出了一种新的CNN-LSTM模型,用于玉米CC的多日预报,考虑气候变化对玉米生长的影响,将5个小气候因子与田间图像估计的历史玉米CC相结合,作为预测模型的输入变量。利用3年多的4个观测点的野外实验数据,对CNN-LSTM在未来3 ~ 7天的预测视界上的表现进行评价,并将预测结果与CNN和LSTM进行对比。结果表明,CNN-LSTM在各预测层均具有最低的RMSE和最高的r2。对比了单变量(历史玉米CC)和多变量(历史玉米CC+小气候因子)输入下CNN-LSTM的预测性能,结果表明,额外的小气候因子能有效提高预测性能。此外,还对CNN-LSTM在玉米不同生育期的3 d预报结果进行了分析,结果表明,在七叶期预报精度最高。因此,CNN-LSTM可以被认为是预测玉米CC的有用工具。
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引用次数: 0
Concurrent channel and spatial attention in Fully Convolutional Network for individual pig image segmentation 猪个体图像分割的全卷积网络并行通道和空间注意
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231601.6528
Zhiwei Hu, Hua Yang, T. Lou, Hong-Ping Yan
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引用次数: 3
Separation and mechanical properties of residual film and soil 残膜与土壤的分离与力学特性
IF 2.4 2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231601.7688
Yu Ren, Wensong Guo, Xufeng Wang, Can Hu, Long Wang, Xiaowei He, Jianfei Xing
{"title":"Separation and mechanical properties of residual film and soil","authors":"Yu Ren, Wensong Guo, Xufeng Wang, Can Hu, Long Wang, Xiaowei He, Jianfei Xing","doi":"10.25165/j.ijabe.20231601.7688","DOIUrl":"https://doi.org/10.25165/j.ijabe.20231601.7688","url":null,"abstract":"","PeriodicalId":13895,"journal":{"name":"International Journal of Agricultural and Biological Engineering","volume":null,"pages":null},"PeriodicalIF":2.4,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72467358","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fine-grained detection of caged-hen head states using adaptive Brightness Adjustment in combination with Convolutional Neural Networks 结合卷积神经网络的自适应亮度调节对笼中母鸡头部状态的精细检测
2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231603.7507
Jia Chen, Qi’an Ding, Wen Yao, Mingxia Shen, Longshen Liu
Timely identification and tracking of abnormal hens in stacked cages are of great significance for precision treatment and the elimination of sick individuals. The head features of the caged-hens are used to overcome observation difficulties caused by the cage and feathers blocking, but it is still hard to identify similar head states. To solve this problem, a fine-grained detection of caged-hens head states was developed using adaptive Brightness Adjustment in combination with Convolutional Neural Networks (FBA-CNN). Grid Region-based CNN (R-CNN), a convolution neural network (CNN), was optimized with the Squeeze-and-Excitation (SE) and Depthwise Over-parameterized Convolutional (DO-Conv) to detect layer heads from cages and to accurately cut them as single-head images. The brightness of each single-head image was adjusted adaptively and classified through the deep convolution neural network based on SE-Resnet50. Finally, we returned to the original image to realize multi-target detection with coordinate mapping. The results showed that the AP@0.5 of layer head detection using the optimized Grid R-CNN was 0.947, the accuracy of classification with SE-Resnet50 was 0.749, the F1 score was 0.637, and the mAP@0.5 of FBA-CNN was 0.846. In summary, this automated method can accurately identify different layer head states in layer cages to provide a basis for follow-up studies of abnormal behavior including dyspnea and cachexia. Keywords: Grid R-CNN, squeeze-and-excitation, Depthwise Over-parameterized Convolutional, adaptive brightness adjustment, fine-grained detection DOI: 10.25165/j.ijabe.20231603.7507 Citation: Chen J, Ding Q A, Yao W, Shen M X, Liu L S. Fine-grained detection of caged-hens head states using adaptive Brightness Adjustment in combination with Convolutional Neural Networks. Int J Agric & Biol Eng, 2023; 16(): 16(3): 208–216.
及时发现和跟踪堆垛笼中的异常母鸡,对于精准治疗和消灭患病个体具有重要意义。笼养母鸡的头部特征被用来克服笼子和羽毛阻塞造成的观察困难,但仍然难以识别相似的头部状态。为了解决这一问题,采用自适应亮度调节与卷积神经网络(FBA-CNN)相结合的方法,开发了一种细粒度检测笼养母鸡头部状态的方法。基于网格区域的CNN (R-CNN)是一种卷积神经网络(CNN),采用挤压与激励(SE)和深度过度参数化卷积(DO-Conv)对其进行优化,以检测笼中的层头,并将其精确切割为单头图像。通过基于SE-Resnet50的深度卷积神经网络对每张单头图像的亮度进行自适应调整和分类。最后回归到原始图像,利用坐标映射实现多目标检测。结果表明:优化后网格R-CNN的层头检测AP@0.5为0.947,SE-Resnet50的分类准确率为0.749,F1得分为0.637,FBA-CNN的mAP@0.5为0.846。综上所述,该自动化方法可以准确识别层笼中不同的层头状态,为后续研究呼吸困难、恶病质等异常行为提供依据。关键词:网格R-CNN,挤压激励,深度过参数化卷积,自适应亮度调节,细粒度检测DOI: 10.25165/ j.j ijabe.20231603.7507引用本文:陈杰,丁庆安,姚伟,沈明霞,刘丽生。基于自适应亮度调节结合卷积神经网络的母鸡头部状态细粒度检测。农业与生物工程学报,2023;16(): 16(3): 208-216。
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引用次数: 0
Effects of LED light spectrum on the growth and energy use efficiency of eggplant transplants LED光谱对茄子移栽生长及能源利用效率的影响
2区 农林科学 Q1 Agricultural and Biological Sciences Pub Date : 2023-01-01 DOI: 10.25165/j.ijabe.20231603.7260
Hao Yang, Ting Wang, Fang Ji, Qing Zhou, Jianfeng Wang
To enhance the transplants' growth and reduce energy use efficiency, Eggplant (Solanum melongena L.) transplants (cv. Jingqie 21) were cultivated in a plant factory laboratory under different LED light spectrums. The experimental treatments included white plus blue LED lights (R: B=0.5, WB0.5), white LED lights (R: B=0.9, W0.9), white plus red LED lights (R: B=2.7, WR2.7), white plus red plus UV lights (R: B=3.8, WRUV3.8), and red plus blue plus green LED lights (R: B=5.4, RBG5.4). The transplants were grown for 30 d under a light intensity of 250 μmol/m2·s and a photoperiod of 16 h/d. The morphological indicators and biomass accumulation of eggplant transplants were significantly higher in the W0.9 treatment compared to the other experimental treatments. The photosynthetic quantum yield in the W0.9 treatment exhibited an increase of over 22% compared to that in the WR2.7 treatment. The shoot dry weight of the W0.9 treatment reached (381±41) mg/plant and the leaf area was (113.3±8.9) cm2, indicating a higher health index compared to the other treatments. However, there were no significant differences in the net photosynthetic rate of the leaves among all treatments. The energy yield (EY) of the W0.9 treatment was (37.7±1.8) g/kW·h, which was higher than others. Therefore, considering the high quality of transplants and the maximization of energy use efficiency, the LED light spectrum in the eggplant transplants production was recommended to the white LED light with an R: B ratio of 0.9. Keywords: eggplant transplants, LED light spectrum, growth, energy use efficiency DOI: Citation: Yang H, Wang T, Ji F, Zhou Q, Wang J F. Effects of LED light spectrum on the growth and energy use efficiency of eggplant transplants. Int J Agric & Biol Eng, 2023; 16(3): 23–29.
为了促进移植物的生长,降低能量利用效率,对茄子移植物(cv。在不同的LED光谱下,在植物工厂实验室培养荆芥21)。实验处理包括白光加蓝光LED灯(R: B=0.5, WB0.5)、白光加红光LED灯(R: B=0.9, W0.9)、白光加红光LED灯(R: B=2.7, WR2.7)、白光加红光加紫外灯(R: B=3.8, WRUV3.8)、红蓝加绿光LED灯(R: B=5.4, RBG5.4)。移植物在250 μmol/m2·s的光强和16 h/d的光周期下生长30 d。W0.9处理茄子移栽植株的形态指标和生物量积累均显著高于其他处理。W0.9处理的光合量子产率比WR2.7处理提高了22%以上。W0.9处理的地上部干重为(381±41)mg/株,叶面积为(113.3±8.9)cm2,健康指数高于其他处理。但各处理间叶片净光合速率无显著差异。W0.9处理的能量产率(EY)为(37.7±1.8)g/kW·h,高于其他处理。因此,考虑到移栽质量的提高和能源利用效率的最大化,茄子移栽生产中的LED光谱推荐使用R: B比为0.9的白光LED。关键词:茄子移栽,LED光谱,生长,能源利用效率DOI:杨慧,王婷,季峰,周强,王建峰。LED光谱对茄子移栽生长和能源利用效率的影响农业与生物工程学报,2023;16(3):。
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引用次数: 0
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International Journal of Agricultural and Biological Engineering
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