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    Real-time segmentation model for abnormal growth areas in farmland based on multispectral aerial images
    HU Hai-yang, CHEN Jian, ZHANG Li-lian, YANG Lin-nan
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (6): 198-203.   DOI: 10.14088/j.cnki.issn0439-8114.2024.06.032
    Abstract196)      PDF (5089KB)(34)       Save
    In response to the problem of abnormal segmentation in farmland, a feature fusion skip connection module and a global-local attention module were used to improve the UNet network model. A real-time segmentation network for abnormal farmland areas was proposed, which achieved fine segmentation of various abnormal farmland areas. The results showed that the Mean Intersection Union ratio (MIoU) of the real-time segmentation model for abnormal growth areas in farmland was significantly better than that of other models, with a MIoU of 41.24%;compared to the model using UNet as the baseline, although the number of parameters in this study model had slightly increased, the farmland segmentation effect had significantly improved, with an increase of 4.16 percentage points in MIoU;compared with the SegFormer model based on Transformer encoder, the parameter count of this study model was basically the same, with an increase of 2.50 percentage points in MIoU. This research model ensured excellent segmentation performance in each category by using adaptive sampling training methods. Using multispectral aerial images to train a real-time segmentation model for abnormal growth areas in farmland could help achieve real-time monitoring and early warning of farmland growth by drones, promote the development of smart agriculture, and provide new methods and ideas for automatic monitoring of farmland growth.
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    Analysis of the effect of material dosages on the compressive strength of alkali activated fly ash concrete at different ages
    SHAO Shan-qing, GONG Ai-min, WANG Ran, LUO Jia-hui, YONG Kang, HUANG Yi-er, JIN Zhuo
    HUBEI AGRICULTURAL SCIENCES    2024, 63 (6): 204-206.   DOI: 10.14088/j.cnki.issn0439-8114.2024.06.033
    Abstract190)      PDF (2412KB)(21)       Save
    In order to improve the practical application of alkali-activated fly ash concrete in engineering, the variation law of compressive strength of alkali activated fly ash concrete at different ages(7、28、56 d) was studied based on different dosages of alkali activator (quicklime powder)(5%、8%、10%) and fly ash(10%、15%、25%). The results showed that under the condition of constant content of quicklime powder, the 7-day compressive strength of alkali-activated fly ash concrete gradually decreased with the increase of fly ash content;at the ages of 28 and 56 days, the compressive strength of alkali-activated fly ash reached its maximum when the fly ash content was 15%. Under the condition of constant fly ash content, when the content of quicklime powder increased from 5% to 8%, the compressive strength of alkali-activated fly ash concrete at all ages increased;when the content of quicklime powder increased from 8% to 10%, the compressive strength of alkali activated fly ash concrete at all ages decreased.
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