ORIGINAL_ARTICLE
Hydrodynamic Studies of Fluidized Bed Chemical Vapor Deposition Reactors to Produce Carbon Nano Tubes via Catalytic Decomposition over Co/Pd MgO
The hydrodynamic studies of fluidized bed reactor has been reported in terms of pressure drop, minimum fluidization velocity and bed volume expansion to contribute to the optimization of the CNTs production parameters in fluidized bed reactors. Minimum fluidization velocity and pressure drop, as the most important parameters, were taken into account for the investigation of the hydrodynamic behavior of the material inside the fluidized bed. The volume bed expansion of carbon nanotubes has been also investigated and the effect of the N2:CH4 flow rate ratio to obtain the highest bed volume expansion for maximum carbon nanotubes accumulation has been reported
https://www.ije.ir/article_72627_3c47259227b42db93edd9aff859026f9.pdf
2015-12-01
1693
1701
fluidized bed chemical vapor deposition (FBCVD)
Hydrodynamic studies
CNTs production
Payam
Aminayi
payam.aminayi@wmich.edu
1
chemical engineering , western michigan University
AUTHOR
Ghazaleh
Allaedini
jiny_ghazaleh@yahoo.com
2
CHEMICAL Engineering, UKM
AUTHOR
Siti Masrinda
Tasirin
masrinda@eng.ukm.my
3
Chemical engineering , UKM
AUTHOR
ORIGINAL_ARTICLE
Evaluation of Column-Tree Moment Resisting Connection with End Plates and Haunched Beam (RESEARCH NOTE)
The column-tree constructional schemes allows for a reliable and convenient erection of moment resisting steel frames. Strengthening of column-tree connection with a haunch part can significantly improve seismic behavior of whole system. In the current study behavior of column-tree connections with haunched beams and end plate splices have been investigated. Special attention was paid for evaluation of the effect of haunch section length and presence of the beams bottom flange. Nonlinear finite element analysis has been used for numerical analyses. The results indicate an improvement of the load bearing capacity of specimens when a longer haunch was used and also when beam bottom flange existed in the haunch part. A direct relation between haunch length and the amount of stress in splice plates was also observed. However all connections showed ductile behavior during cyclic analysis, specimens with longer haunch revealed more desirable behavior. It was concluded that despite some deficiencies observed during the numerical tests, in presence of a longer haunch and also the beam\'s bottom flange, a noticeable improvement of the general behavior of connection can be achieved.
https://www.ije.ir/article_72628_53d93fa88a8816ee5e7a6b55d7f94856.pdf
2015-12-01
1702
1710
Column
Tree Connection
Haunch
Splice Plate
finite element analysis
Ductile Behavior
Ashkan
Baharmast
ashkanbaharmast@yahoo.com
1
Civil Engineering, University of Guilan
AUTHOR
ORIGINAL_ARTICLE
People Re-identification in Non-overlapping Field-of-views using Cumulative Brightness Transform Function and Body Segments in Different Color Spaces
Non-overlapping field-of-view (FOV) cameras are used in surveillance system to cover a wider area. Tracking in such systems is generally performed in two distinct steps. In the first step, people are identified and tracked in the FOV of a single camera. In the second step, re-identification of the people is carried out to track them in the whole area under surveillance. Various conventional features such as clothes and appearance of person have been used to identify peoples in the cameras. However, similarity between appearance and clothes of people causes unreliable results. Thus, much reliable features are still required to increase the ability of tracking system. The aim of this paper is to propose a novel algorithm to identify people in a network of cameras with disjoints views. In our proposed methodology, according to relative size of various parts, human body are divided into three portions of head, middle section and lower section. Considering histograms of these portions, matching process was done aiming to distinguish persons in FOV of cameras. The other main challenge in such multi-camera system is to deal with illumination changes and varying appearance of people at different cameras view. The cumulative brightness transform function (CBTF) was employed to alleviate the difficulty of illumination changes. Experiments were conducted in RGB, YCbCr and HSV color spaces and it was found that YCbCr color space gives a better performance result compared to other color spaces used in this work.
https://www.ije.ir/article_72629_bb6181d9fa4725e23b5f6f4c3d1f67b6.pdf
2015-12-01
1711
1719
People tracking
Camera networks
Non
overlapping FOV
various segments of human body
Cumulative brightness transform function
Hamid
Hassanpour
h_hassanpour@yahoo.com
1
AUTHOR
Ali
Ghanbari Sorkhi
ali.ghanbari289@gmail.com
2
AUTHOR
Pier Luigi
Mazzeo
mazzeo@ba.issia.cnr.it
3
, 2Istituto di Studi sui Sistemi Intelligenti
AUTHOR
ORIGINAL_ARTICLE
Singular Value Decomposition based Steganography Technique for JPEG2000 Compressed Images
In this paper, a steganography technique for JPEG2000 compressed images using singular value decomposition in wavelet transform domain is proposed. In this technique, DWT is applied on the cover image to get wavelet coefficients and SVD is applied on these wavelet coefficients to get the singular values. Then secret data is embedded into these singular values using scaling factor. Different compression rates are considered for JPEG2000 images after embedding the secret images. GA is used to optimize the value of SF. Maximum capacity of the proposed technique is 25% of cover image size and maximum PSNR values between cover and its stego image is more than the PSNR of existing techniques. Embedding capacity of proposed technique is also higher than the embedding capacity of existing techniques. Also, PSNR between secret image and extracted image is high and hence the visual quality of the extracted secret image is good enough to the human visual system. Steganalysis tests are performed on the stego images to show imperceptibility of proposed technique.
https://www.ije.ir/article_72630_495541b4d2eb0841712f25f4086c4c99.pdf
2015-12-01
1720
1727
DWT
SVD
PSNR
GA
SF
JPEG2000
Satvinder Singh
Bhatia
ssbhatia@thapar.edu
1
School of Mathematics, Thapar University
AUTHOR
Kulbir
Singh
ksingh@thapar.edu
2
Electronic and Communication Engineering, Thapar University
AUTHOR
Geeta
Kasana
gkasana@thapar.edu
3
Computer Science and Engineering Department, Thapar University, Patiala
AUTHOR
ORIGINAL_ARTICLE
A Geometric View of Similarity Measures in Data Mining
The main objective of data mining is to acquire information from a set of data for prospect applications using a measure. The concerning issue is that one often has to deal with large scale data. Several dimensionality reduction techniques like various feature extraction methods have been developed to resolve the issue. However, the geometric view of the applied measure, as an additional consideration, is generally neglected. Since each measure has its own perspective to the data, different interpretations may achieved on data depending on the used measure. While efforts are often focused on adjusting the feature extraction techniques for mining the data, choosing a suitable measure regarding to the nature or general characteristics of the data or application is more appropriate. Given a couple of sequences, a specific measure may consider them as similar while another one may quantify them as dissimilar. The goal of this research is twofold: to evince the role of feature extraction in data mining, and to reveal the significance of similarity measures geometric attributes in detecting the relationships between data.
https://www.ije.ir/article_72631_72d3d4c8d57555be359294e5d7000fd3.pdf
2015-12-01
1728
1737
Data mining
Feature Extraction
Similarity measures
Geometric view
Hamid
Hassanpour
h_hassanpour@yahoo.com
1
AUTHOR
Ali
Darvishi
alidarvishi.nit@gmail.com
2
AUTHOR
ORIGINAL_ARTICLE
A New Trans-admittance-Mode Biquad Filter Suitable for Low Voltage Operation
The trans-admittance-mode (TAM) might act as a transforming bridge for voltage-mode to current-mode conversion. In this study a new low voltage operated electronically tunable TAM biquad filter structure realizing all the seven standard filtering functions namely; low-pass (LP), band-pass (BP), high-pass (HP), regular-notch (RN), low-pass-notch (LPN), high-pass-notch (HPN) and all-pass (AP) from the same configuration through appropriate selection of voltage inputs is presented. The proposed circuit structure comprises of three current conveyor trans-conductance amplifiers (CCTAs). Moreover, the new biquad filter structure still enjoys (i) realizations neither require inverted nor scaled voltage input(s), (ii) the employment of two grounded capacitors (Ideal for IC implementation and attractive for absorbing shunt parasitic capacitances), (iii) the pole frequency can be tuned electronically, (iv) possesses low incremental active and passive sensitivity performance and useful in low-voltage low-power applications. PSPICE simulation results using 0.25μm TSMC CMOS parameters verify the theoretical analysis.
https://www.ije.ir/article_72632_c73de328537cb4735e8c3c7441034955.pdf
2015-12-01
1738
1745
Analog signal processing
biquad
Filter
Transadmittance
mode
Durg singh
chauhan
pdschauhan@gmail.com
1
Electrical Engineering, Indian Institute of Technology, Banaras Hindu Univ
AUTHOR
Ravindra
Tomar
r_tomar15@rediffmail.com
2
Electronics and communication engineering, Anand Engineering college, Agra
AUTHOR
sajai
singh
sajaivir75@gmail.com
3
Electronics and Communication Engg., Jaypee Institute of Information Technology
AUTHOR
ORIGINAL_ARTICLE
A Common Weight Multi-criteria Decision analysis-data Envelopment Analysis Approach with Assurance Region for Weight Derivation from Pairwise Comparison Matrices
Deriving weights from a pairwise comparison matrix (PCM) is a subject for which a wide range of methods have ever been presented. This paper proposes a common weight multi criteria decision analysis-data envelopment analysis (MCDA-DEA) approach with assurance region for weight derivation from a PCM. The proposed model has several merits over the competing approaches and removes the drawbacks of the well-known DEAHP and DEA/AR methods. Some numerical examples are provided from the literature in order to confirm the merits of the proposed method and its applications in multi criteria decision making. Results disclose the advantages of the proposed approach.
https://www.ije.ir/article_72633_43052c556ffcfde68fa378e4a31e2e75.pdf
2015-12-01
1746
1755
Analytic Hierarchy Process
Data Envelopment Analysis
DEAHP
Common weights
Assurance region
S. A.
Torabi
satorabi@ut.ac.ir
1
School of Industrial Engineering, University of Tehran
AUTHOR
Neda
Pourreza
neda_pourreza@ut.ac.ir
2
School of Industrial Engineering, University of Tehran
AUTHOR
Seyed Morteza
Hatefi
smhatefi@alumni.ut.ac.ir
3
Faculty of Engineering, ShahreKord University
AUTHOR
ORIGINAL_ARTICLE
A Particle Swarm Optimization Approach to Joint Location and Scheduling Decisions in A Flexible Job Shop Environment
In traditional scheduling literature, it is generally assumed that the location of facilities are predetermined and fixed in advance. However, these decisions are interrelated and may impact each other significantly. Therefore finding a schedule and facility location has become an important problem as an extension of the well-known scheduling problems. In this research we consider joint decisions on planning of machines’ layout and scheduling of jobs on each machine in a flexible job shop environment. The aim is to minimize maximum completion time. The problem is formulated as a mathematical programming model and is solved using an enhanced particle swarm optimization (PSO). Furthermore parameters of algorithm is optimized by Taguchi statistical tool. A lower bound is also devised for evaluating the results obtained.
https://www.ije.ir/article_72634_323ad28e2aceca6c83882372b7dcc207.pdf
2015-12-01
1756
1764
flexible job shop scheduling
facility layout
transportation time
PSO
Taguchi design of experiments
Hamid
Daliri
daliri.h@gmail.com
1
Department of Industrial Engineering, Faculty of Engineering, Tarbiat Modares University
AUTHOR
Hadi
Mokhtari
mokhtari_ie@yahoo.com
2
Industrial Engineering, University of Kashan
AUTHOR
Isa
Nakhai
nakhaeisa@gmail.com
3
Department of Industial Engineering, Faculty of Engineering, Tarbiat Modares University
AUTHOR
ORIGINAL_ARTICLE
Bilateral Teleoperation Systems Using Backtracking Search optimization Algorithm Based Iterative Learning Control
This paper deals with the application of Iterative Learning Control (ILC) to further improve the performance of teleoperation systems based on Smith predictor. The goal is to achieve robust stability and optimal transparency for these systems. The proposed control structure make the slave manipulator follow the master in spite of uncertainties in time delay in communication channel and model parameters of master-slave robots, called model mismatch. The time delays in communication channel are assumed to be large, unknown and asymmetric, but the upper bound of the delay is assumed to be known. The main aspect of the proposed controller is that a designer can use the classical controller like Proportional-Integrator-Derivative (PID). However, one of its main difficulties is how to assign appropriate parameter values for the controller. In the other words, the parameters of the controller are not unique and are chosen only to satisfy the stability condition. To solve this problem, in this paper, the local controller is optimized by Backtracking Search optimization Algorithm (BSA), which is a novel heuristic algorithm with a simple construction. Simulation results illustrate the appropriate performance of the proposed controller.
https://www.ije.ir/article_72635_0c637d7ee531c0a9c463c405c0202f58.pdf
2015-12-01
1765
1773
Teleoperation
Transparency
iterative learning control
Smith predictor
optimization
Backtracking Search Optimization Algorithm
ORIGINAL_ARTICLE
A Reliability based Modelling and Optimization of an Integrated Production and Preventive Maintenance Activities in Flowshop Scheduling Problem
Traditional scheduling problems with the batch processing machines (BPM) assume that machines are continuously available, and no time is needed for their preventive maintenance (PM). In this paper, we study a realistic variant of flowshop scheduling which integrates flow shop batch processing machines (FBPM) and preventive maintenance for minimizing the makespan. In order to tackle the given problem, we develop an electromagnetism-like (EM) algorithm, as a recent evolutionary technique, and propose a enhanced EM algorithm, in which the EM is hybridized with a diversification mechanism, and an effective local search to enhance the efficiency of the algorithm. The proposed algorithms are evaluated by comparison against two existing well-known EMs in the literature. For this purpose, we not only study the behavior of different operators and parameters of these algorithms by Taguchi experimental design method, but also investigate the impacts of the rise in problem sizes on the performance of the developed algorithm. The superiority of our hybrid EM is inferred from all the computational results obtained in various circumstances.
https://www.ije.ir/article_72636_9a78d8876993cc67fce8b729c8f2657f.pdf
2015-12-01
1774
1781
scheduling
Electromagnetism
like (EM) algorithm
Reliability
preventive maintenance
Hadi
Mokhtari
mokhtari_ie@yahoo.com
1
Industrial Engineering, University of Kashan
AUTHOR
Saber
Molla-Alizadeh
s.mollaalizadehie@gmail.com
2
AUTHOR
Amir
Noroozi
a.moroozie@yahoo.com
3
AUTHOR
ORIGINAL_ARTICLE
Health Monitoring of Welded Steel Pipes by Vibration Analysis
In the present work, structure health monitoring (SHM) of welded steel pipes was used to diagnosis their state via vibration based damage detection techniques. The dynamic quantities such as Frequency Response Functions (FRFs), mode shapes and modal parameters from structural vibration to detect damage were measured, set on linear averaging mode, with a maximum frequency of analysis of 3.2 kHz. Two most commonly used welding techniques were used, namely: shielded metal arc welding (SMAW) and gas tungsten arc welding (GTAW). Static tests were performed to assure the quality of welded steel pipes such as three point bending test (3PB), face bending, and tensile testing. In addition, X- ray, liquid penetration inspection methods were utilized as a NDT. The results show for non-cracked pipes, the first three modes, the higher the damping frequency and lower the damping ratio. This reflects the difficulty of dissipating energy at higher frequency. Also, it was found that SMAW to give higher damping ratio (7.418%) as compared with GTAW joints (7.220). So, the latter joints have higher stiffness than the former ones. However, cracked pipes welded lay 85 A seem to are highest damping for all the tested pipes (8.110%). The results demonstrated that the FRFs technique is a potentially powerful tool for damage detection, health monitoring of welded steel structural pipes
https://www.ije.ir/article_72637_51b85fdb26525519cba6f4dd92f9e5e3.pdf
2015-12-01
1782
1789
Keywords Structure health monitoring (SHM)
welded steel pipes
Frequency Response Functions (FRFs). shielded metal arc welding (SMAW)
gas tungsten arc welding (GTAW)
three point bending (3PB)
mahmoud
El-wazery
eng_mahmoudsamir@yahoo.com
1
Production Engineering, Faculty of Engineering, University of menofia
AUTHOR
abdo
hassan
abdousafy@yahoo.ca
2
prod., faculty of eng.
AUTHOR
said
hassan
said_hussien2005@yahoo.co
3
prod., faculty of eng
AUTHOR
ORIGINAL_ARTICLE
An Investigation on Two Types of Crystalline Micro-diamond Film Coated Tools Lapping with Sapphire Wafer
Two types of micron-diamond films were prepared on YG6 substrate by hot filament chemical vapor deposition(HFCVD) method. Morphology and orientation of crystalline growth were evaluated by SEM and XRD. Diamond film coated tools and sapphire wafer’ surface before and after lapping experiment were contrasted. The results indicated that a significant change in Raman spectrum of two types of micron-diamond film appeared after lapping. The two types of micron- diamond film’s graphitization were all obviously. The SMDF tool’s value of friction coefficient was larger than the FMDF’s. The surface roughness of sapphire wafer lapped by FMDF was lower than by SMDF. Compared two kinds of micron diamond film, FMCD's lapping effect was better.
https://www.ije.ir/article_72638_38cb66ca11f6d841f740b62e1cc285bc.pdf
2015-12-01
1790
1795
micron
diamond film
lapping
sapphire wafer
Wei
Feng
zhu5411492@163.com
1
College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics
AUTHOR
ORIGINAL_ARTICLE
Experimental and Theoretical Study of Thompson Seedless Grapes Drying using Solar Evacuated Tube Collector with Force Convection Method
An evacuated tube solar collector drier is designed and developed to study analytically and experimentally drying kinetics of Thompson seedless grapes in Pune, India. Drying experiments are carried out in the month of April- June for continuous three years from 2013-2015. During the experimentation, temperatures of hot and cold air at various places, ambient relative humidity and humidity variation in drying chamber, wind velocity and mass of the grape are measured on hourly basis. 10 kg of Thompson seedless grapes are dried in forced convection heat transfer mode from initial moisture content of 76% (wb) to final moisture content 15%(wb) in 37 hours. The drying is carried out under the uncontrolled conditions. The average evacuated tube solar collector efficiency is found 24.5% where as the stacked type dryer which is insulated from outside has given drying efficiency up to 37.1%. To study drying behavior analytically nine different drying models have been tested. It is observed that, Page model describe the drying behavior accurately with highest coefficient of determination (R2 = 0.993), lowest reduced chi-square (χ2 = 5.19x10-5) and lowest root mean square error (RMSE = 0.02071).
https://www.ije.ir/article_72639_a953f82b739adbaf6c16a1c7756ed924.pdf
2015-12-01
1796
1801
Evacuated tube solar dryer
Thompson grapes
drying kinetics
Forced Convection
Arundhati
warke
arundhatiw@sitpune.edu.in
1
Asociate Professor, Symbiosis Institute of Technology
AUTHOR
Abhijit
Auti
autiabhijeet@sitpune.edu.in
2
Principla, Suman Ramesh Tulsani Technical Campus, Pune
AUTHOR
Dilip
Pangavhane
drpangavhane@yahoo.co.in
3
MEchanical Engineering, COE awasari
AUTHOR
Amol
Ubale
amol_ubale@yahoo.co.in
4
Mechanical engineering, Zeal College of Engineering & Research, Pune
AUTHOR
ORIGINAL_ARTICLE
Investigation of the Effects of Non-Linear and Non-Homogeneous Non-Fourier Heat Conduction Equations on Temperature Distribution in a Semi-Infinite Body
In this paper, the non-Fourier heat conduction in a semi-infinite body was examined. The heat wave non-Fourier heat conduction model was used for thermal analysis. Thermal conductivity was assumed temperature-dependent which resulted in a non-linear equation. The heat source was also considered temperature-dependent which resulted in a non-homogeneous equation. The Mac-Cormack predictor-corrector numerical method was employed to solve the equations. It was concluded that, the non-linear analysis of the non-Fourier heat transfer problems is of great importance. Also, the case which assumed a temperature-dependent heat source had a considerable difference with the case where a constant heat source was assumed.
https://www.ije.ir/article_72640_d3fad759fee66f04ff68dcff369c26ec.pdf
2015-12-01
1802
1807
Non
Fourier
Heat Conduction
Numerical method
Linear Equation
Homogeneous Equation
Mohammad javad
Noroozi
mo.j.noroozi@gmail.com
1
Factuly of Engineering, Ayatollah Borujerdi University
AUTHOR
ORIGINAL_ARTICLE
Vibration Analysis of Circular Magneto-Electro-Elastic Nano-plates Based on Eringen s Nonlocal Theory
The present work mainly studies the free vibration of circular magneto-electro-elastic (MEE) nano-plates based on the Kirchhoff’s plate theory within the framework of nonlocal elasticity theory to account for the small scale effect. The MEE nano-plate studied here is considered to be fully clamped and subjected to the external magnetic and electric potentials. Using nonlocal constitutive relations of MEE materials, the governing equations are derived, by applying Maxwell’s equation and Hamilton’s principle. By employing Galerkin method, the eigen matrix form of the governing equation is obtained. A detailed numerical study is conducted to study the influences of the small scale effect, thickness and radius of the nano-plate and piezoelectric volume fraction of the MEE material on the natural frequencies of nano-plate. Furthermore, the effects of the applied magnetic and electric potentials on the size-dependent natural frequencies are investigated numerically.
https://www.ije.ir/article_72641_c4fccff87875fb61fac8c0dc940093f6.pdf
2015-12-01
1808
1817
MEE
Nano
plates
Kirchhoff’s plate theory
Nonlocal elasticity
Natural frequency
Ilgar
Jafarsadeghi-pournaki
i.jafarsadeghi@urmia.ac.ir
1
mechanical engineering, urmia university
AUTHOR
Mojtaba
Fakhari
st_m.fakhari@urmia.ac.ir
2
mechanical engineering, urmia university
AUTHOR
Ahad
Amiri
ahadamiri69@yahoo.com
3
mechanical engineering, urmia university
AUTHOR
Ghader
rezazadeh
g.rezazadeh@urmia.ac.ir
4
mechanical engineering, Urmia university
AUTHOR