Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Modular approach for an ASIC integration of electrical drive controls
107
118
71895
EN
Youssef
Kebbati
Departement de Physique, Université d'Orléans
Journal Article
1970
01
01
VLSI circuits design allows today to consider new modes of implementation for electrical controls. However, design techniques require an adaptation effort that few designers, too accustomed to the software approach, provide. The authors of this article propose to develop a methodology to guide the electrical designers towards optimal performances of control algorithms implementation. Thus, they were based on two concepts: modular design and algorithm architecture adequation. An exemple of DTC control implemented in an ASIC circuit is presented and the results of the integration performances valide our methodology.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Effect of colloidal Particles associated with the liquid bridge in sticking during drying in Superheated Steam
119
126
71897
EN
Ihsan
Hamawand
National Centre for Engineering in Agriculture, USQ
Journal Article
1970
01
01
It is very important in the design of a drying system is to evaluate sticking behaviour of the materials goes under drying. A new approach to the sticking issue is applied in this study by carrying out a sticking test for the liquid associated with the materials under study. It was found that the liquid bridge is responsible of the initial sticking of the materials to the contact surface and the colloidal material in this liquid is eventually responsible of building a sticky solid bridge during drying. The glass transition temperature for the Brewers Spent Grain (BSG) particles and the colloidal solution that expelled from these particles is tested using Differential Scanning Calorimetric (DSC). However that the chopped BSG particles showed no glass transition temperature there was a marked amount of it that sticked to the rotary drum dryer and the sample holders during drying. The sticking behaviour may be regarded to the colloidal particles in the liquid associated with the grain. The colloidal particles in this liquid is filtered and concentrated through evaporation and then tested by the (DSC) where it showed a glass transition temperature at (-23) and (-33) C. In addition, the associated liquid has a honey shape and a sticky touch when concentrated. These two properties are an indication that this colloidal material may be responsible of sticking the BSG to the steel surfaces during drying.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
An integrated AHP-VIKOR methodology for plant location selection
127
137
71899
EN
Reza
Tavakkoli-Moghaddam
Industrial Engineering, University of Tehran
0000-0002-6757-926X
M.
Heydar
Department of Industrial and Manufacturing Enginee, University of Wisconsin, Milwaukee
S.M.
Mousavi
Industrial Engineering Department, Faculty of Engineering, Shahed University
Journal Article
1970
01
01
Plant location selection invariably has a significant impact on the performance of many companies or manufacturing systems. In this paper, a novel methodology is structured to solve this problem. The two decision making methods, namely AHP and VIKOR, are integrated in order to make the best use of information available, either implicitly or explicitly. In addition, the Delphi method is utilized to select the most influential criteria by a few experts. The aim of using AHP is to give the weights of the just-selected criteria. Finally, the VIKOR method is taken into account to rank alternatives. Finally, a case study demonstrates the applicability of the proposed methodology.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Performance of SST k-ω Turbulence Model for Computation of Viscous Drag of Axisymmetric Underwater Bodies
139
146
71901
EN
Md. Abdul
Alim
Mathematics, Bangladesh University of Engineering and Technolog
Md.
Rahman
NAOE, BUET
Md.
Karim
NAME, BUET
Journal Article
1970
01
01
This paper presents 2-D finite volume method for computation of viscous drag based on Reynolds-averaged Navier-Stokes (RANS) equations. Computations are performed on bare submarine hull DREA and six axisymmetric bodies of revolution with a number of length-diameter (L/D) ratios ranging from 4 to 10. Both structured and unstructured grids are used to discretize the domain around the bodies. Different turbulence models have been tested to simulate turbulent flow. Finally, results computed by 2-D method are compared with published experimental results and found satisfactory.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Comparison Nanostructure Behaviour of Copper Species on the Silicamatrix Xerogels
147
153
71903
EN
S.H
Tohidi
Material, Material Research School, Nuclear Science and Tech
Journal Article
1970
01
01
The incorporation of copper species is synthesized in a silica matrix by the sol-gel method. We have doped copper ions and copper particles using two different copper sources: Cu(NO3)2.3H2O and copper particles chemically synthesized. We can prepare the particles of copper metallic, cuprous and cupric oxide and compare the synthesis and characterization copper species on the silica matrix. On this way, their structures are analyzed by FT IR spectroscopy and XRD diffraction at 200,400 and 600°C temperatures. we have recognized three main region contain Rocking (R), Bending (B )and Stretching (S) on their structure using FT IR spectrum. Also, the SEM micrographs and chemical analysis are compared by EDX of Cu and CuO/SiO2 together. Average size of particles was determinated about 150-200 nm for copper particles and about 50 nm for copper ions by TEM micrograph.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Dynamic Analysis of A Three-Rotor Flexible Coupling with Angular Misalignment
155
164
71905
EN
Mehdi
Akhondizadeh
Mechanical Engineering, Sirjan University of Technology
0000-0001-9698-9746
Journal Article
1970
01
01
In this paper, the dynamic response of a three-rotor flexible coupling to the angularmisalignment has been studied. The coupling is a power transmission agent between the motor andgearbox, in the power transmission system of SAG Mill (semi autogenously mill) in the Gol-e-Gohariron ore complex in Sirjan, Iran. Degrees of freedom of the system are the model's lateral deflectionsand the rigid-body linear motions. The equations of motion are obtained by using the Lagrangeequations through successive partial differentiation of the kinetic and potential energies. In thedynamic model, the middle rotor is considered as an eccentric flexible Jeffcott rotor. The gearboxinput shaft is considered to be angularly misaligned with respect to the motor shaft. Diagrams of theamplitudes versus the frequency ratio reveal the system dynamic response to the angularmisalignment.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Numerical Investigation on the Effect of Injection Timing on Combustion and Emissions in a DI Diesel Engine at Low Temperature Combustion Condition
165
179
71906
EN
Mohsen
Pourfallah
Mechanical & Indusrial Engineering, Babol Noshirvani University of Technology
0000-0003-3524-5457
Hossein
Oryani
Mechainical Engineering, Urmia University
Samad
Jafarmadar
Mechanical Engineering, Urmia University
S.
Khalil Arya
Mechainical Engineering, Urmia University
Hassan
Khatamnejad
Mechainical Engineering, Urmia University
Journal Article
1970
01
01
One promising way to achieve low temperature combustion regime is the use of a large amount of cooled EGR. In this paper, the effect of injection timing on low temperature combustion process and emissions were investigated via three dimensional computational fluid dynamics (CFD) procedures in a DI diesel engine using high EGR rates. The results show when increasing EGR from low levels to levels corresponding to reduced temperature combustion, soot emission after first increasing, is decreased beyond 40% EGR and get the lowest value at 58% EGR rate. Soot and NOx emissions are simultaneously decreased at advanced injection timing before 20.5 ºCA BTDC in conjunction with 58% cooled EGR rate in compared to baseline case.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
Extraction of Zn, Mn and Co from Zn-Mn-Co-Cd-Ni containing solution using D2EHPA, CYANEX® 272 and CYANEX® 302
181
190
71909
EN
Eskandar
Keshavarz Alamdari
New Materials, MERC
D. F.
Haghshenas
MMPE, Amirkabir University of Technology
D.
Darvishi
NM, MERC
S.K.
Sadrnezhaad
Materials Science and Engineering, Sharif University of Technology
Journal Article
1970
01
01
Effects of pH, D2EHPA, Cyanex® 302 and Cyanex® 272 on extractions of zinc, manganese and cobalt from a Zn-Mn-Co-Cd-Ni containing solution was comprehensively investigated at the room temperature. The addition of Cyanex® 302 indicated a left-shifting-effect on the extraction curve of zinc, a right-shifting-effect on the extraction curve of manganese and no effect on the extraction of cobalt. The addition of Cyanex® 272 shifted all three curves to the right. The most suitable extractant for separation of zinc from manganese was therefore 0.3–0.3 mixture of D2EHPA with Cyanex® 302 and for separation of manganese from cobalt was sole D2EHPA. The stoichiometric coefficient for the extraction reaction of zinc (whether using pure D2EHPA or a mixture made of D2EHPA with Cyanex® 272 or Cyanex® 302) was 3. It varied from 4 to 5 for manganese, when the quantity of Cyanex® 302 dissolved in D2EHPA increased from 0 to 100%. Utilizing the above results, a two stage leaching was devised to recover zinc, manganese and cobalt from a complex solution. At the first stage, a 0.6M D2EHPA extractant could recover zinc and a scrubbing reaction with organic:aqueous (O:A) ratio of 20:1 could wash-out cadmium from the raffinate. In the second stage, the leaching residue was treated with 0.6M D2EHPA for recovery of manganese. This stage was then followed by a one-stage scrubbing of cobalt with O:A ratio of 20:1.
Materials and Energy Research Center
International Journal of Engineering
1025-2495
24
2
2011
07
01
An Improvement in Fluorocarbon Chain Re-orientation by Reactive Dyes
191
196
71911
EN
A.
Khoddami
Engineering, Iran University of Science and Technology (IUST)
Najva
Shakib
Textile Engineering, Isfahan Univ. Tech.
Arash
Ataeian
Textile Engineering, Isfahan Univ. Tech.
Journal Article
1970
01
01
There is an increasing demand for air-dry performance of fluorocarbon finished materials. Thus, dyeing with different types of reactive, mono, bi, and multi-functional, dyes was evaluated as a novel treatment to create correct surface interface to maintain fluorocarbon performance without ironing or tumble drying. The effects of pre-treatment on fluorocarbon finishing of cotton fabric, a cellulosic polymer, was investigated by measuring wash fastness as well as 3M water repellency test and samples hot pressing. Fabrics mechanical properties were compared by measuring tensile strength. Also, the effect of the finishing on samples colour was studied. The results indicated that by dyeing with proper reactive dye not only the fastness and repellency properties can be improved, but also the molecular re-orientation of fluorocarbon polymers can reach fulfilment level for water repellency at ambient temperature. Further more, no negative effect on tensile properties and samples colour was observed.