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Design and Prototyping of Teff (ጤፍ) Row Planter and Fertilizer Applier
Tesfaye Gonite,
Hiluf Reda
Issue:
Volume 6, Issue 4, August 2018
Pages:
91-97
Received:
5 July 2018
Accepted:
1 September 2018
Published:
21 September 2018
Abstract: Teff is one of the most grown crops and a preferable food in Ethiopia. Wholesale prices for Teff are relatively high, making the crop attractive to some producers as a cash crop, production costs are also high, implying fertilizer prices and the labor-intensive nature of the crop. Now a daysteff got attention of international market. But, productivity yields are relatively low (around 1.2 tones/ha) and suffer from high loss rates (25-30% both before and after harvest). Respective bodies tried to take different actions to improve the productivity of teff. It has been argued recently that low teff productivity is partly caused by the way farmers sow teff seed; broadcasting teff seed by hand using a rate of 25–50 kg per hectare. Researchers approved reducing the seed rate to between 2.5 and 3 kg per hectare by row planting allows for reduced competition between seedlings and optimal tillering of the teff plants. This study was aimed to design and prototyping of teff row planter and fertilizer applier. It will improve productivity of teff and reduces cost of teff production process. Literature review and visiting of existing teff row planter machines, conceptual and embodiment design procedures, modeling machine components by solid work software, manufacturing the components and assembling of machine in Debre Berhan university manufacturing workshop, testing the applicability of machine on farm were used as methodology. The metering of teff and the locomotion mechanism of the machine has given more emphasis through the design and manufacturing process. The researchers designed ten rows planter. Due to lack of appropriate manufacturing machine and material, actually obtained a machine which can plant six rows in one trip. For better result and applicability, components should produce with appropriate machine and from appropriate material. some shaking mechanism also recommended for better performance.
Abstract: Teff is one of the most grown crops and a preferable food in Ethiopia. Wholesale prices for Teff are relatively high, making the crop attractive to some producers as a cash crop, production costs are also high, implying fertilizer prices and the labor-intensive nature of the crop. Now a daysteff got attention of international market. But, productiv...
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The Solution of the Overvoltage Damage for IMS’s Microseismic Monitoring System
Issue:
Volume 6, Issue 4, August 2018
Pages:
98-103
Received:
1 August 2018
Accepted:
4 September 2018
Published:
15 October 2018
Abstract: With the further development of digitized mine system construction, various kinds of communication，information，automatic and intelligent electronic equipment are widely used in mines. Due to the harsh underground environment of domestic (China) mines, various faults of electronic equipment occur frequently, such as dampness, dust pollution, burn damage, mechanical damage. This makes the system can not run stably and reliably. Especially the phenomenon of burning damage of electronic equipment. It is often large area damage when it happens, which seriously affects the safety production of enterprises. The IMS equipment of microseismic monitoring system that installed in Shizhuyuan Mine was burning damaged many times. Through the in-depth analysis and diagnosis of the failure of the IMS burning module and the overall microseismic monitoring system underground chamber, the fault (which is the system overvoltage) and its causes are found out. According to the reality condition of Shizhuyuan mine that how to prevent the overvoltage damage is systematic analysis and improvement. Than adopt effective measure and methods such as: prevention of overvoltage generation, cut off the intrusion pathway of overvoltage, choosing the surge protector reasonably with the insulation level of the system, switch to the right power supply plan and power supply facilities. These protective measures and methods comprehensively protect the safety of microseismic monitoring system equipment. After that, the microseismic monitoring system is successfully protected and no longer burned down. It successfully solves the problem of equipment burning damage of microseismic monitoring system, provides reliable guarantee for mine safety production. Shizhuyuan mine is a typical underground mining metal ore in China, the successfully solution of overvoltage damage provides a good demonstration for how to prevent mine electronic equipment underground from burning damage, It also provides more standardized and accurate requirements for the way and the protection of power supply system, and the laying of lines for a new projects.
Abstract: With the further development of digitized mine system construction, various kinds of communication，information，automatic and intelligent electronic equipment are widely used in mines. Due to the harsh underground environment of domestic (China) mines, various faults of electronic equipment occur frequently, such as dampness, dust pollution, burn da...
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The Influences of Air Intake Temperature on the Gasoline Engine’s Otto Cycle
Issue:
Volume 6, Issue 4, August 2018
Pages:
104-109
Received:
17 October 2018
Published:
18 October 2018
Abstract: This thesis is about the calculations and researches of the improved coolant system of turbocharged gasoline engine, it introduces the basic concept of gasoline engine’s turbo technology, and shows the detailed information and parameters of 486 turbocharged gasoline engine, established the formulas of the Otto cycle and its relevant parameters, emphasized to analyze the influences of the intake air temperature on the engine’s Otto cycle. The effects of the turbo gasoline intake temperature mainly contains 2 points: the outlet temperature of the turbo and the temperature decline effect of the coolant system; This thesis compares the effects of gasoline’s Otto Cycle which configures or not with a middle cooler, utilized a thermal dynamics calculation method to research, calculate and analysis the parameters of the turbocharged engine’s Otto cycle, the results are corresponding with the experiment(the thermal balance experiment), the property indices are included circulate thermal efficiency, exergy efficiency and average valid pressure. Through the contrasts and analysis, it obviously shows that, with the middle coolant, it has an advantage in the average valid pressure, intake temperature, and exergy efficiency. Absolutely it is necessary and efficient configured with middle coolant on the turbocharged gasoline engine.
Abstract: This thesis is about the calculations and researches of the improved coolant system of turbocharged gasoline engine, it introduces the basic concept of gasoline engine’s turbo technology, and shows the detailed information and parameters of 486 turbocharged gasoline engine, established the formulas of the Otto cycle and its relevant parameters, emp...
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Study on the Influence of Geometric Shape of Material on the Reposed Angle Based on EDEM
Issue:
Volume 6, Issue 4, August 2018
Pages:
110-125
Received:
17 October 2018
Published:
18 October 2018
Abstract: When studying the discreteness of granular materials, the size of the angle of repose can be used as an important parameter to study the stability of granular materials. In recent years, many scholars have studied the morphology of particles, but they are basically based on the regular shape of spheres and ellipsoids, which are very different from the actual particle shape, which leads to the measurement results not consistent with the actual results. Therefore, based on the above reasons, this paper mainly studied the influence of geometric shape for the Reposed Angle, the simulation experiment is carried for the Reposed Angle using the discrete element software EDEM, the Reposed Angle is measured for five different shape using slice cutting analysis method, and the experimental measurement has carried on for the Reposed Angle for each shape, SPC method is used to determine the reliability of the data. The results show that the size of the Reposed Angle increases gradually in the order of sheet, intermediate, horn, strip and equal square among the five studied shape, the mechanism is that the greater the number of internal contact is, can truly reflect the interaction and occlusal relationship, the more easily locked the particles are in the force chain, the more difficult to separate the particles are, the more stable the accumulation characteristics are.
Abstract: When studying the discreteness of granular materials, the size of the angle of repose can be used as an important parameter to study the stability of granular materials. In recent years, many scholars have studied the morphology of particles, but they are basically based on the regular shape of spheres and ellipsoids, which are very different from ...
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A Prediction Method for Galloping of Transmission Lines Based on Improved Neural Network
Yongfeng Cheng,
Jingshan Han,
Bin Liu,
Danyu Li
Issue:
Volume 6, Issue 4, August 2018
Pages:
126-133
Received:
7 November 2018
Published:
8 November 2018
Abstract: The traditional back-propagation neural network (BP) have the disadvantages including the random generation of initial weights and thresholds, easy to fall into the local optimization, and the convergence speed is slow, and it’s hard to confirm the number of neurons in hidden layer. In this paper, the Genetic Algorithm (GA) is utilized to optimize the initial weights and thresholds space of the BP neural network. To obtain the optimal weight matrix and threshold matrix, the error-forward-feedback neural network training is carried out by using the data of transmission line galloping. The trial and error method are used to reduce the number of hidden layer neurons and find the optimal number of neurons. An optimized GA-BP neural network model is established to warn the occurrence of transmission line galloping. The historical data of the transmission lines galloping in the related areas is analyzed by the optimized GA-BP neural network model. The validity and practicability of the proposed GA-BP neural network model is tested and verified. The simulation results show that the GA-BP neural network module could predict the galloping situation of transmission lines more accurately and effectively. As a result, it provides a strong guarantee for preventing large-scale grid fault disasters, and further improves the power grid's ability to withstand natural disasters.
Abstract: The traditional back-propagation neural network (BP) have the disadvantages including the random generation of initial weights and thresholds, easy to fall into the local optimization, and the convergence speed is slow, and it’s hard to confirm the number of neurons in hidden layer. In this paper, the Genetic Algorithm (GA) is utilized to optimize ...
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