AMA, Agricultural Mechanization in Asia, Africa and Latin America (AMA) (issn: 00845841) is a peer reviewed journal first published online after indexing scopus in 1982. AMA is published by Farm Machinery Industrial Research Corp and Shin-Norinsha Co. AMA publishes every subjects of general engineering and agricultural engineering.
AMA, Agricultural Mechanization in Asia, Africa and Latin America (ISSN: 00845841) is a peer-reviewed journal. The journal covers Agricultural and Biological Sciences and all sort of engineering topic. the journal's scopes are in the following fields but not limited to:Azerbaijan Medical Journal Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Agricultural mechanization level in two governorates in northwestern Tunisia has been assessed and analyzed. Interviews, observations, and a structured questionnaire were used for the collection of the database. Five artificial neural networks (ANN) models with two hidden layers were used to estimate the mechanization level. Initially, 80 attributes were used as input variables to predict the level of mechanization. The Forward regression method (SPSS 22 software) followed by the significance analysis method was used to select the typical variables. Ten variables were selected as models’ inputs. The performance of the ANN model was evaluated with various statistical measures including coefficient of determination (R2), mean square error (MSE), and mean absolute error (MAE). The optimal ANN models had correlations of 0.94 with calculated mechanization levels. Sensitivity analysis of the models showed that farm area, labor, dominant crop area, and the number of tractors is the typical inputs affecting the level of mechanization. The results presented in this study justify the low level of mechanization according to farm area (Maximum value less than 30%), dominant crop area (average value less than 25%), number of tractors (Maximum value less than 30%). However, the availability of labor gives an acceptable level (on average 50%) for farms with some skilled labor between 3 and 4 and a low mechanization level for farms with some skilled labor is less than 2 (on average 10%).
The identification of the tumour extent is a fundamental difficulty in brain tumour treatment planning and accurate measurement. Without ionising radiation, non-invasive magnetic resonance imaging (MRI) has emerged as a first-line diagnostic method for brain malignancies. Manually segmenting the extent of a brain tumour from 3D MRI volumes is a time-consuming job that heavily relies on the operator's knowledge. So, in this paper, we proposed a modified UNet structure that is based on residual networks that use shuffling periodically at encoder section of original UNet and sub-pixel convolution at decoder section. Sub-pixel convolution has the benefit over conventional resize convolution and it has extra parameters and thus stronger modelling capability at the same computing complexity and avoids de-convolution overlapping. The proposed UNet was tested on BraTS Challenge 2017 with high- grade glioma (HGG). The model was tested on BraTS 2017 and 2018 datasets. Tumour core (TC), whole tumour (WT), and enhancing core (EC) were the three major labels to be segmented (EC). The test results showed that the proposed UNet outperform the existing techniques.
Sprouted potato detection is an essential measure before potatoes enter warehouse storage and can effectively reduce the chance of warehouse spoilage of potatoes. How to detect potato health intelligently and efficiently is important to improve the quality of potatoes before they enter the warehouse. To achieve the detection and grading of sprouted potatoes in a variety of complex scenarios, this study proposes a sprouted potato detection algorithm based on an improved YOLOV5 model. The Cross Conv module with improved feature similarity is used to replace the Conv of the original C3 module of YOLOV5, which improves the similarity loss problem in the fusion process and increases the feature expression capability; the SPPF with accelerated space pyramid is used instead of SPP for fusion pooling, which reduces the number of fusion parameters and accelerates the speed of fusion pooling; the 9-Mosaic algorithm is enhanced and optimized to strengthen small target features before the image enters Backbone; then the accuracy is further improved using hyperparametric evolution with genetic evolution anchor points and multi-scale training mechanism, and the experimental results show that: the improved model recognition accuracy reaches a minimum of 90.14%, the average accuracy of the whole class mAP@.5 reaches 88%, and the F1-score is 84%, which is higher than the original YOLOV5 network in the same test dataset The model mAP@.5 index is 7.4% higher than the original model under the same test dataset, which has obvious advantages over the existing model. The real-time sprouting potato image recognition based on improved YOLOV5 proposed in this study has good accuracy and effectiveness, which can basically meet the requirements for establishing automatic potato sorting line and realizing high-throughput and fast potato classification, and provide technical reference for intelligent agricultural equipment in modern agricultural environment.
Considering the influence of speed on the path tracking accuracy of transplanter, a path tracking algorithm based on speed self-adjusting is proposed to the improve performance of the linear path tracking of transplanter operating in complex field environments. Firstly, a speed self- adjusting fuzzy controller is established, where the lateral and heading deviations are taken as inputs and driving speed as outputs. Then the look- ahead distance is adjusted online through the adjusted driving speed, and the desired front-wheel turning angle is obtained using a pure pursuit algorithm in combination with the look-ahead distance adaptive strategy. A simulation experiment based on Matlab/Simulink and a field experiment were carried out to verify the performance of the proposed algorithm. The Kubota SPU-68C rice transplanter with the automatic navigation control system was used as a test platform in the field experiment. The results showed that the proposed algorithm could automatically adjust the driving speed of the transplanter according to the real-time deviation. Compared with the pure tracking algorithm, the proposed algorithm can obtain better path tracking accuracy and achieve the linear tracking state faster.
This article introduces an optimization study to find the optimal gear ratios for a two-stage helical gearbox with second stage double gear sets to obtain the minimum gearbox bottom area. To do that, a simulation experiment with six main design parameters is conducted. These parameters include the total gearbox ratio, the face width coefficient of both stages, the allowable contact stress of both stages and the output torque. From the results of the experiment, the influence of the main design parameters on the optimal gear ratio of the first stage u1 was evaluated using Minitab software. In addition, a regression formula to calculate u1 has been given.