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Measurement of Acoustic Emission Signals Using Doppler Radar
Issue:
Volume 1, Issue 1, March 2017
Pages:
1-4
Received:
16 December 2016
Accepted:
27 December 2016
Published:
15 March 2017
DOI:
10.11648/j.ajmme.20170101.11
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Abstract: Specialist nondestructive testing (NDT) know the method of acoustic emission. One of its advantages is high reliability of obtained results. Shows the sources of emissions do not doubt the presence of identified dangerous areas. The disadvantages of this method are the need for prior mechanical loading and the use of contact piezoelectric transducers. These limitations can be eliminated by applying the "Gorbunov"effect, discovered by the authors. Its essence is the abnormal interaction of the elastic waves of ultrasound with electron gas.
Abstract: Specialist nondestructive testing (NDT) know the method of acoustic emission. One of its advantages is high reliability of obtained results. Shows the sources of emissions do not doubt the presence of identified dangerous areas. The disadvantages of this method are the need for prior mechanical loading and the use of contact piezoelectric transduce...
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Development of a Temperature-Controlled Paddy Rice Parboiler
Imonigie P. S.,
Yusuf K. A.,
Atanda E. O.
Issue:
Volume 1, Issue 1, March 2017
Pages:
5-9
Received:
31 January 2017
Accepted:
28 February 2017
Published:
24 March 2017
DOI:
10.11648/j.ajmme.20170101.12
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Abstract: Parboiling is a major processing factor affecting the quality of milled rice. In this study, a paddy rice parboiler was designed, fabricated and its performance evaluated. During the design and fabrication, of the parboiler considerations were given to the cost of fabrication, simplicity of operation by the local farmers, portability and easy mechanism of loading and offloading the paddy. Performance testing of the machine was carried out at three different levels of steeping temperature (60, 70 and 80°C) andat different steeping time of 2.5, 3.0 and 3.5hrs respectively to determine the effects of steeping temperature and time on the parboiling efficiency and the milling quality of the parboiled rice grains. The optimum parboiling efficiency of 95% and corresponding milling quality of 91% was obtained at 70°C steeping temperature and at 3hrs of steeping time. The results of the statistical analysis of the data obtained from the performance evaluation of the machine revealed that both the steeping temperature and time has significant effects on the parboiling efficiency and the milling quality of the rice grains at 0.05 confidence limit. The production cost of the parboiler is $275.
Abstract: Parboiling is a major processing factor affecting the quality of milled rice. In this study, a paddy rice parboiler was designed, fabricated and its performance evaluated. During the design and fabrication, of the parboiler considerations were given to the cost of fabrication, simplicity of operation by the local farmers, portability and easy mecha...
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Minimization of Unconstrained Nonpolynomial Large-Scale Optimization Problems Using Conjugate Gradient Method Via Exact Line Search
Adam Ajimoti,
Onah David Ogwumu
Issue:
Volume 1, Issue 1, March 2017
Pages:
10-14
Received:
28 February 2017
Accepted:
22 March 2017
Published:
7 April 2017
DOI:
10.11648/j.ajmme.20170101.13
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Abstract: The nonlinear conjugate gradient method is an effective iterative method for solving large-scale optimization problems using the iterative scheme x(k+1) = x(k) + αkd(k) where: x(k+1) is the new iterative point, x(k) is the current iterative point, αk is the step-size and d(k) is the descent direction. In this research work, we employed the technique of exact line search to compute the step-size in the iterative scheme mentioned above. The line search technique gave good results when applied to some non-polynomial unconstrained optimization problems.
Abstract: The nonlinear conjugate gradient method is an effective iterative method for solving large-scale optimization problems using the iterative scheme x(k+1) = x(k) + αkd(k) where: x(k+1) is the new iterative point, x(k) is the current iterative point, αk is the step-size and d(k) is the descent direction. In this research work, we employed the techniqu...
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Research on Finite Element Simulation of Direct Redrawing Process of Extra Deep Drawing (EDD) Steel at Elevated Temperatures
Issue:
Volume 1, Issue 1, March 2017
Pages:
15-19
Received:
2 March 2017
Accepted:
24 March 2017
Published:
13 April 2017
DOI:
10.11648/j.ajmme.20170101.14
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Abstract: In the previous studies of EDD steel for direct drawing and redrawing operations, dies were designed and developed. Deep drawing and redrawing experimentations were also performed for different size of blanks at various temperatures i.e. Room Temperature, 150 C, 300 C, 450 C on 1mm EDD steel sheets. Later on Material models were constructed in the Preprocessor of LS Dyna for both direct drawing and redrawing operations. Simulations were run by using material model Barlat-36 and visco -plastic thermal model 106 at various temperatures for various blank sizes. Results were extracted from the simulations like Punch Load, thickness distribution and temperature gradient and these results were compared with the experimental results and discussed the impact of each one.
Abstract: In the previous studies of EDD steel for direct drawing and redrawing operations, dies were designed and developed. Deep drawing and redrawing experimentations were also performed for different size of blanks at various temperatures i.e. Room Temperature, 150 C, 300 C, 450 C on 1mm EDD steel sheets. Later on Material models were constructed in the ...
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Fabrication and Performance Test of Glass-Bamboo Fiber Based Industry Safety Helmet
Md. Rafiquzzaman,
Md. Taimum Islam,
Md. Raihan Hossain,
Md. Fazla Rabby,
Md. Rifat Hashar
Issue:
Volume 1, Issue 1, March 2017
Pages:
20-25
Received:
1 March 2017
Accepted:
28 March 2017
Published:
15 April 2017
DOI:
10.11648/j.ajmme.20170101.15
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Abstract: In this 21st century, the interest in using natural fibers as reinforcement in polymer composite material has increased significantly. Now this natural fiber based composite manufacturing has been a wide area of research and it is the most preferred choice for its superior properties like low density, stiffness, light weight and possesses better mechanical properties. All helmets attempt to protect the user’s head by absorbing mechanical energy and protecting against penetration. Industrial helmet is essentially made up of polyethylene thermoplastic. In this study, an attempt has been made to fabricate bamboo-glass fiber based polymer composite helmet and investigate its performances. For this helmet, the materials were chosen epoxy resin (ADR 246 TX) as the matrix and bamboo mat and glass fiber as reinforcement. The construction of the helmet is done by using hand lay -out techniques. The helmets thus made were tested for their mechanical properties like compression and impact test. Visual analysis of the helmets shows that hand lay - out techniques provides a reliable process to make a perfect helmet. The performance test results indicate that bamboo-glass fiber based polymer helmet has a sustainable strength over polythene thermoplastic for the application of industrial safety helmets. Cost analysis indicate that using this helmet cost saving more that 30% can be achieved.
Abstract: In this 21st century, the interest in using natural fibers as reinforcement in polymer composite material has increased significantly. Now this natural fiber based composite manufacturing has been a wide area of research and it is the most preferred choice for its superior properties like low density, stiffness, light weight and possesses better me...
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