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
Parallel robots have received increasing attention due to their inherent advantages over conventional serial mechanism, such as high rigidity, high load capacity, high velocity, and high precision. A definite advantage of parallel robots is the fact that, in most cases, actuators can be placed on the truss, thus achieving a limited weight for the moving parts, which makes it possible for parallel robots to move at a high speed. These advantages avoid the drawbacks on serial ones and make the mobile platforms of the parallel manipulators carry out higher performances. Therefore, parallel manipulators have been applied to industrial manufacturing, flight simulation, medical resuscitation, and so on. The basis for model-based control of parallel manipulators is an efficient formulation of the motion equations. In this paper, the motion equations in redundant coordinates is presented in two mathematical models which can be used by control for the delta parallel manipulator.
Variable temperature intermittent drying is the important developing trend of hot air drying and prediction of drying rate is the basis for intelligent control of variable temperature intermittent drying. In order to confirm significant parameters on drying rate in variable temperature intermittent drying and establish moisture prediction model, variable temperature intermittent drying of rice variety Nanjing 9108 was performed in the pattern of drying stage Ⅰ (containing Initial Moisture Content, Drying Temperature Ⅰ and Moisture Content Reduction Ⅰ), tempering stage Ⅰ (containing Tempering Temperature and Intermittent Ratio) and drying stage Ⅱ (containing Drying Temperature Ⅱ and Drying Time Ⅱ). Significant parameters were confirmed by stepwise regression and the stepwise regression model was capable of predicting drying rate with an R2 of 0.94. The drying temperature Ⅱ has the most significant impact on the drying rate. Comparison with the model established by usual parameters in continuous drying proved that fully considering drying stage Ⅰ and tempering stage Ⅰ is a necessary condition for accurately predicting drying rate in drying stage Ⅱ in variable temperature intermittent drying.
The present investigation entitled “Biochemical changes of mango varieties associated with post harvest salicylic acid treatment and cardboard carton storage” had sixteen treatment combination replicated three times in Completely Randomized Design. At maturity condition mango fruits were harvested and stored in cardboard carton by post harvest application of salicylic acid at 0.1, 0.5 and 1.0 g/l doses. On the basis of two years data analysis it was revealed that maximum pectin content (1.96 and 1.95 %) was recorded in Langra variety at 15 days storage period by 0.5 g/l salicylic acid application. Maximum polyphenol oxidase enzyme activity (56.38 and 56.40 units/g) was reported in variety Dashahari at 5 days ambient storage period by 0.1 g/l salicylic acid treatment. Maximum peroxidase enzyme activity and beta carotene content (463.69 and 464.70 units/g, 3495.93 and 3496.73 μg/100g) was found in variety Dashahari at 20 days ambient storage period by 0.5 g/l salicylic acid application. Highest ascorbic acid content (19.37 and 19.42 mg/100g) was recorded in variety Dashahari at 5 days ambient storage period by 0.5 g/l salicylic acid application. Maximum TSS content (28.00 and 27.00 Brix0) was reported in the variety Chausa at 20 days ambient storage period by 0.5 g/l salicylic acid application. Thus the present investigation indicated that post harvest application of enhanced the quality characteristics of mango fruits during storage in cardboard carton.
Aiming at the problems of irregular ditching and uneven force of the cutters used in the current tobacco planting process, this paper designs a special ditching cutter for the tobacco planting ditch fertilizer machine. In order to make the cutter force uniform and labor-saving, the line segment ratio and included angle of the ditching tool ridge curve (second-order Bezier curve) are the changing factors. The parameters of the ditching tool are optimized through EDEM simulation analysis, and the current ridge curve line segment is obtained through EDEM simulation analysis and field test verification. The ratio is 1:3, when the included angle is 150°, the uniform force of the ditching tool is the best and it can open a groove with a preset width of 100mm and a depth of 100mm (adjustable depth), and the ditching pattern is regular and stable.
Aiming at addressing the problem of low mechanization of filling and transporting citrus seedling pot in China, a new type of seedling pot filling and transporting machine with 120 pots at a time was designed. Based on the study of the flow characteristic of the seedling substrate, key components of the filling and transporting machine, such as blanking mechanism, transmission mechanism, flap mechanism, and steering mechanism were designed. The effects of the opening width of the hopper, the rotating speed of the stirring shaft, the moisture content of the seedling substrate, and the forward speed of the transporting device on the filling effect of seedling pot were studied by the experimental method, and the optimal operation parameters were determined. The prototype tests were repeated 3 times with the best combination of parameters. The running of the prototype was stable. The number of filling bowls was 120, and the average filling time was about 40 s. The machine was in good condition for loading and unloading. The seedling pots were arranged in order. The average filling mass was 1.881kg, which was 0.006kg different from the predicted value, the relative error was 0.32%, and the mass variation coefficient was 2.97%, which was 0.12% different from the predicted value, the relative error is 4.0%. The designed machine can provide a reference for the development and optimization of the citrus substrate filling and transporting machine.