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 Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery Interventional Pulmonology
Taking a crawler joint harvester chassis frame as the research object, a 3D frame model was built, importing the model into Ansys Workbench to establish a finite element model, and conducting modal analysis and taking the wall thickness of the frame as the design variable, the frame thickness as the research variable, frame multi-objective optimization was carried out. Under the premise of meeting the performance parameters, calculate the best frame wall thickness, improve the accuracy and efficiency of optimization, genetic algorithm was used to optimize multi-objective optimization of beam thickness. The results showed that under the verification of the stiffness, strength and modal characteristics of the chassis frame, the high-strength steel composite frame reduces the 36.1Kg, weight reduction effect by 11.1% compared with the original frame quality, and the lightweight effect is significant.
This paper introduces the results of research on optimization of powder mixture electrical discharge machining (PMEDM) process when processing cylindrically shaped parts with graphite electrodes. In this study, 90CrSi tool steel was chosen as the workpiece material. Besides, the electrode wear rate (EWR) is selected as the objective function of the optimization problem. To solve this problem, an experiment with the Taguchi design was performed. Also, the Minitab R19 software was used to design experiments and analyze the results. The influence of the input process parameters, including the powder concentration, the pulse on time, the pulse off time, the servo current, and the servo voltage on EWR was investigated. In addition, optimal process parameters for minimum EWR were given.
The composition of nutrient media intended for the formation of morphogenic callus in tissue culture is a key element of the intermediate link in the production of plants in vitro. The six potato varieties of the Ukrainian breeding of different ripeness groups early-ripening, mediumearly, medium-ripening were used as the research object. Fragments of the apical meristem of plant organs were selected for the introduction of in vitro in the culture. Parts of stems with axillary buds were used to produce callus tissue. The Murashige and Skoog media (Murashige and Skoog, 1962) with sucrose content modifications of 30 and 60% were used to induce callus genesis and growth of the resulting callus. The control version of the medium contained 10% sucrose. The resulting material was planted in the open ground on the experimental plots of Sumy National Agrarian University. The results of the studies indicate a generally positive, but uneven effect on the rooting nature of test tube plants of the varieties used. Individual variants of potato cultivars of different ripeness groups grown on a medium of both 10 and 30% and 60% sucrose content are considered to be promising for further reproduction and use in the breeding process.
Aiming to solve the problem of poor weeding effect and high energy consumption of the paddy between plant weeding device, an inverted V- type counter-rotating weeding device between plant in paddy field was designed. Through theoretical analysis, the main structural parameters of the weeding device were determined. Using MATLAB virtual simulation combined with indoor test, the theoretical rotation trajectory of the weeding claw and the actual soil cutting trajectory model was established, and the factors affecting the weeding performance were determined. The machine forward speed, the rotary velocity of weeding claw and the thickness of the water layer were selected as the test factors, and the stress and the weeding rate were used as the test indicators to perform a rotating orthogonal test. Using variance analysis and response surface analysis methods, the influence of each factor and its first-level interaction on the test indicators were obtained. The multi- objective optimization design method was adopted in order to obtain the best combination of factors and parameters of the inverted V-type contra-rotating weeding device, and the optimization results was verified through indoor test, and finally the field performance of the device was verified through field test. The results showed that the interaction of the machine forward speed and the thickness of water layer, the rotary velocity of weeding claw and the thickness of water layer has an obvious influence on the stress. The order of the influence of each factor on the stress is: thickness of water layer> machine forward speed> rotary velocity of weeding claw. The interaction between the machine forward speed and the rotary velocity of weeding claw, the rotary velocity of weeding claw and the thickness of water layer has an obvious influence on the weeding rate. The order of the influence of each factor on the weeding rate is: rotary velocity of weeding claw> thickness of water layer> machine forward speed. Indoor test verification showed that: under the best combination of parameters with a machine forward speed of 0.76 m/s, a rotary velocity of weeding claw of 112.00 r/min, and a thickness of water layer of 0.01 m, the average stress was 0.54174MPa, and the error between the optimization results was 0.42 % the average weeding rate was 82.344%, and the error between the optimized results was 0.80% at the same time, the seedling damage rate in the indoor test was 4.16% the field test equipment runs smoothly, and the power consumption and weeding performance meet the agronomic requirements of the paddy field weeding machine.
This research work focuses on chemical modification of jute substrate and development of a multifunctional treatment which improves several drawbacks of jute fabric. The assembly of sodium hydroxide, sodium carbonate and sodium sulphite was applied on jute fabric through exhaust method. The results revealed decrease in bending length, flexural rigidity and drape coefficient pointing towards increase in softness and drape of the jute fabric. The colony forming units of Gram +ve bacteria (Staphylococcus aureus) and Gram -ve bacteria (Escherichia coli) decreased. Additionally, there was decrease in transmission of both UV – A and UV – B rays. The surface morphology was studied by scanning electron microscopy. The results suggested that chemical modification of jute substrate is multifunctional and results in improving both physical and functional properties of the fabric.