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  Subjects -> ENGINEERING (Total: 2284 journals)
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ENGINEERING (1208 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Hybrid Journal   (Followers: 5)
AASRI Procedia     Open Access   (Followers: 15)
Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 2)
ACS Nano     Full-text available via subscription   (Followers: 227)
Acta Geotechnica     Hybrid Journal   (Followers: 7)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 5)
Acta Polytechnica : Journal of Advanced Engineering     Open Access   (Followers: 2)
Acta Scientiarum. Technology     Open Access   (Followers: 3)
Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
Adaptive Behavior     Hybrid Journal   (Followers: 11)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 6)
Advanced Science     Open Access   (Followers: 5)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 6)
Advanced Science, Engineering and Medicine     Partially Free   (Followers: 7)
Advanced Synthesis & Catalysis     Hybrid Journal   (Followers: 17)
Advances in Artificial Neural Systems     Open Access   (Followers: 4)
Advances in Calculus of Variations     Hybrid Journal   (Followers: 2)
Advances in Catalysis     Full-text available via subscription   (Followers: 5)
Advances in Complex Systems     Hybrid Journal   (Followers: 7)
Advances in Engineering Software     Hybrid Journal   (Followers: 25)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 14)
Advances in Fuzzy Systems     Open Access   (Followers: 5)
Advances in Geosciences (ADGEO)     Open Access   (Followers: 10)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 20)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 25)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
Advances in Operations Research     Open Access   (Followers: 11)
Advances in OptoElectronics     Open Access   (Followers: 5)
Advances in Physics Theories and Applications     Open Access   (Followers: 12)
Advances in Polymer Science     Hybrid Journal   (Followers: 40)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Remote Sensing     Open Access   (Followers: 37)
Advances in Science and Research (ASR)     Open Access   (Followers: 6)
Aerobiologia     Hybrid Journal   (Followers: 1)
African Journal of Science, Technology, Innovation and Development     Hybrid Journal   (Followers: 4)
AIChE Journal     Hybrid Journal   (Followers: 29)
Ain Shams Engineering Journal     Open Access   (Followers: 5)
Akademik Platform Mühendislik ve Fen Bilimleri Dergisi     Open Access  
Alexandria Engineering Journal     Open Access   (Followers: 1)
AMB Express     Open Access   (Followers: 1)
American Journal of Applied Sciences     Open Access   (Followers: 28)
American Journal of Engineering and Applied Sciences     Open Access   (Followers: 11)
American Journal of Engineering Education     Open Access   (Followers: 9)
American Journal of Environmental Engineering     Open Access   (Followers: 16)
American Journal of Industrial and Business Management     Open Access   (Followers: 23)
Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
Annals of Combinatorics     Hybrid Journal   (Followers: 3)
Annals of Pure and Applied Logic     Open Access   (Followers: 2)
Annals of Regional Science     Hybrid Journal   (Followers: 7)
Annals of Science     Hybrid Journal   (Followers: 7)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
Applicable Analysis: An International Journal     Hybrid Journal   (Followers: 1)
Applied Catalysis A: General     Hybrid Journal   (Followers: 6)
Applied Catalysis B: Environmental     Hybrid Journal   (Followers: 9)
Applied Clay Science     Hybrid Journal   (Followers: 4)
Applied Computational Intelligence and Soft Computing     Open Access   (Followers: 12)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 3)
Applied Nanoscience     Open Access   (Followers: 7)
Applied Network Science     Open Access  
Applied Numerical Mathematics     Hybrid Journal   (Followers: 5)
Applied Physics Research     Open Access   (Followers: 3)
Applied Sciences     Open Access   (Followers: 2)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 4)
Arabian Journal for Science and Engineering     Hybrid Journal   (Followers: 5)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 4)
Archives of Foundry Engineering     Open Access  
Archives of Thermodynamics     Open Access   (Followers: 7)
Arid Zone Journal of Engineering, Technology and Environment     Open Access  
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 3)
Asian Engineering Review     Open Access  
Asian Journal of Applied Science and Engineering     Open Access   (Followers: 1)
Asian Journal of Applied Sciences     Open Access   (Followers: 2)
Asian Journal of Biotechnology     Open Access   (Followers: 8)
Asian Journal of Control     Hybrid Journal  
Asian Journal of Current Engineering & Maths     Open Access  
Asian Journal of Technology Innovation     Hybrid Journal   (Followers: 8)
Assembly Automation     Hybrid Journal   (Followers: 2)
at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
ATZagenda     Hybrid Journal  
ATZextra worldwide     Hybrid Journal  
Australasian Physical & Engineering Sciences in Medicine     Hybrid Journal   (Followers: 1)
Australian Journal of Multi-Disciplinary Engineering     Full-text available via subscription   (Followers: 2)
Autonomous Mental Development, IEEE Transactions on     Hybrid Journal   (Followers: 8)
Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 4)
Bautechnik     Hybrid Journal   (Followers: 1)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 23)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 3)
BER : Manufacturing Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Motor Trade Survey     Full-text available via subscription   (Followers: 1)
BER : Retail Sector Survey     Full-text available via subscription   (Followers: 2)
BER : Retail Survey : Full Survey     Full-text available via subscription   (Followers: 2)
BER : Survey of Business Conditions in Manufacturing : An Executive Summary     Full-text available via subscription   (Followers: 3)
BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Biofuels Engineering     Open Access  
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 9)
Biomedical Engineering     Hybrid Journal   (Followers: 16)
Biomedical Engineering and Computational Biology     Open Access   (Followers: 13)
Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 17)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 32)
Biomedical Engineering: Applications, Basis and Communications     Hybrid Journal   (Followers: 5)
Biomedical Microdevices     Hybrid Journal   (Followers: 8)
Biomedical Science and Engineering     Open Access   (Followers: 3)
Biomedizinische Technik - Biomedical Engineering     Hybrid Journal  
Biomicrofluidics     Open Access   (Followers: 4)
BioNanoMaterials     Hybrid Journal   (Followers: 2)
Biotechnology Progress     Hybrid Journal   (Followers: 39)
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription  
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 10)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 14)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 3)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers, Droit, Sciences et Technologies     Open Access  
Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 14)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 41)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 8)
Catalysis Science and Technology     Free   (Followers: 6)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
Ciencia e Ingenieria Neogranadina     Open Access  
Ciencia en su PC     Open Access   (Followers: 1)
Ciencias Holguin     Open Access   (Followers: 1)
CienciaUAT     Open Access  
Cientifica     Open Access  
CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
CIRP Journal of Manufacturing Science and Technology     Full-text available via subscription   (Followers: 14)
City, Culture and Society     Hybrid Journal   (Followers: 21)
Clay Minerals     Full-text available via subscription   (Followers: 9)
Clean Air Journal     Full-text available via subscription   (Followers: 2)
Coal Science and Technology     Full-text available via subscription   (Followers: 3)
Coastal Engineering     Hybrid Journal   (Followers: 11)
Coastal Engineering Journal     Hybrid Journal   (Followers: 4)
Coatings     Open Access   (Followers: 3)
Cogent Engineering     Open Access   (Followers: 2)
Cognitive Computation     Hybrid Journal   (Followers: 4)
Color Research & Application     Hybrid Journal   (Followers: 1)
COMBINATORICA     Hybrid Journal  
Combustion Theory and Modelling     Hybrid Journal   (Followers: 13)
Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 13)
Communications Engineer     Hybrid Journal   (Followers: 1)
Communications in Numerical Methods in Engineering     Hybrid Journal   (Followers: 2)
Components, Packaging and Manufacturing Technology, IEEE Transactions on     Hybrid Journal   (Followers: 26)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 255)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 179)
Composites Part B : Engineering     Hybrid Journal   (Followers: 226)
Composites Science and Technology     Hybrid Journal   (Followers: 195)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 13)
Computational Optimization and Applications     Hybrid Journal   (Followers: 7)
Computational Science and Discovery     Full-text available via subscription   (Followers: 2)
Computer Applications in Engineering Education     Hybrid Journal   (Followers: 6)
Computer Science and Engineering     Open Access   (Followers: 17)
Computers & Geosciences     Hybrid Journal   (Followers: 28)
Computers & Mathematics with Applications     Full-text available via subscription   (Followers: 5)
Computers and Electronics in Agriculture     Hybrid Journal   (Followers: 4)
Computers and Geotechnics     Hybrid Journal   (Followers: 10)
Computing and Visualization in Science     Hybrid Journal   (Followers: 5)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 29)
Conciencia Tecnologica     Open Access  
Concurrent Engineering     Hybrid Journal   (Followers: 3)
Continuum Mechanics and Thermodynamics     Hybrid Journal   (Followers: 6)
Control and Dynamic Systems     Full-text available via subscription   (Followers: 8)
Control Engineering Practice     Hybrid Journal   (Followers: 42)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 25)
CT&F Ciencia, Tecnologia y Futuro     Open Access  

        1 2 3 4 5 6 7 | Last

Journal Cover Ain Shams Engineering Journal
  [SJR: 0.434]   [H-I: 14]   [5 followers]  Follow
  This is an Open Access Journal Open Access journal
   ISSN (Online) 2090-4479
   Published by Elsevier Homepage  [3042 journals]
  • Fault classification in power systems using EMD and SVM

    • Authors: N. Ramesh Babu; B. Jagan Mohan
      Pages: 103 - 111
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): N. Ramesh Babu, B. Jagan Mohan
      In recent years, power quality has become the main concern in power system engineering. Classification of power system faults is the first stage for improving power quality and ensuring the system protection. For this purpose a robust classifier is necessary. In this paper, classification of power system faults using Empirical Mode Decomposition (EMD) and Support Vector Machines (SVMs) is proposed. EMD is used for decomposing voltages of transmission line into Intrinsic Mode Functions (IMFs). Hilbert Huang Transform (HHT) is used for extracting characteristic features from IMFs. A multiple SVM model is introduced for classifying the fault condition among ten power system faults. Algorithm is validated using MATLAB/SIMULINK environment. Results demonstrate that the combination of EMD and SVM can be an efficient classifier with acceptable levels of accuracy.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2015.08.005
  • Optimal design and tuning of novel fractional order PID power system
           stabilizer using a new metaheuristic Bat algorithm

    • Authors: Lakhdar Chaib; Abdelghani Choucha; Salem Arif
      Pages: 113 - 125
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Lakhdar Chaib, Abdelghani Choucha, Salem Arif
      This paper proposes a novel robust power system stabilizer (PSS), based on hybridization of fractional order PID controller (PI λ D μ ) and PSS for optimal stabilizer (FOPID-PSS) for the first time, using a new metaheuristic optimization Bat algorithm (BA) inspired by the echolocation behavior to improve power system stability. The problem of FOPID-PSS design is transformed as an optimization problem based on performance indices (PI), including Integral Absolute Error (IAE), Integral Squared Error (ISE), Integral of the Time-Weighted Absolute Error (ITAE) and Integral of Time multiplied by the Squared Error (ITSE), where, BA is employed to obtain the optimal stabilizer parameters. In order to examine the robustness of FOPID-PSS, it has been tested on a Single Machine Infinite Bus (SMIB) power system under different disturbances and operating conditions. The performance of the system with FOPID-PSS controller is compared with a PID-PSS and PSS. Further, the simulation results obtained with the proposed BA based FOPID-PSS are compared with those obtained with FireFly algorithm (FFA) based FOPID-PSS. Simulation results show the effectiveness of BA for FOPID-PSS design, and superior robust performance for enhancement power system stability compared to other with different cases.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2015.08.003
  • Effects of higher modes and MDOF on strength reduction factor of
           elastoplastic structures under far and near-fault ground motions

    • Authors: Mohsen Gerami; Navid Siahpolo; Reza Vahdani
      Pages: 127 - 143
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Mohsen Gerami, Navid Siahpolo, Reza Vahdani
      In seismic codes, the force strength reduction factor is proposed to transform elastic to inelastic strength. The ductility reduction factor, Rμ , plays a key role on R factor if no overstrength is present. The Rμ is determined by SDOF systems. But the higher mode (HM) and Multi-Degree-of-Freedom (MDOF) effects need to be considered to extract the R factor. These effects are studied by proposing αv-MDOF via at least 1764 Nonlinear dynamic Analysis of 2D-frames. Also a sensitivity study has been performed on Rμ and αv-MDOF . Results obtained from studies conducted on the frames, indicate that HM and MDOF effects have a considerable influence on the base shear. Also the αv-MDOF is typically higher than unity both for ordinary and for near-field earthquakes and it is affected by period, span number and ductility level. These effects are remarkable for near-field motions. Finally, a simplified practical expression is proposed to estimate the αv-MDOF .

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2015.08.015
  • Mixed convection boundary layer flows of a non-Newtonian Jeffrey’s fluid
           from a non-isothermal wedge

    • Authors: S. Abdul Gaffar; V. Ramachandra Prasad; E. Keshava Reddy
      Pages: 145 - 162
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): S. Abdul Gaffar, V. Ramachandra Prasad, E. Keshava Reddy
      This article presents the nonlinear, steady state mixed convection boundary layer flow, heat and mass transfer of an incompressible non-Newtonian Jeffrey’s fluid past a non-isothermal wedge. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a versatile, implicit finite-difference Keller box technique. The influence of a number of emerging non-dimensional parameters, namely Deborah number (De), ratio of relaxation to retardation times ( λ ), pressure gradient parameter (m), Buoyancy ratio parameter (N), mixed convection parameter ( λ 1 ) , radiation parameter ( F ) and heat generation/absorption parameter ( Δ ) on velocity, temperature and concentration evolution in the boundary layer regime is examined in detail. Also, the effects of these parameters on surface heat transfer rate, mass transfer rate and local skin friction are investigated.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2015.09.005
  • Taxonomy of Cross-Platform Mobile Applications Development Approaches

    • Authors: Wafaa S. El-Kassas; Bassem A. Abdullah; Ahmed H. Yousef; Ayman M. Wahba
      Pages: 163 - 190
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Wafaa S. El-Kassas, Bassem A. Abdullah, Ahmed H. Yousef, Ayman M. Wahba
      The developers use the cross-platform mobile development solutions to develop the mobile application once and run it on many platforms. Many of these cross-platform solutions are still under research and development. Also, these solutions are based on different approaches such as Cross-Compilation approach, Virtual Machine approach, and Web-Based approach. There are many survey papers about the cross-platform mobile development solutions but they do not include the most recent approaches, including Component-Based approach, Cloud-Based approach, and Merged approach. The main aim of this paper is helping the researchers to know the most recent approaches and the open research issues. This paper surveys the existing cross-platform mobile development approaches and attempts to provide a global view: it thoroughly introduces a comprehensive categorization to the cross-platform approaches, defines the pros and cons of each approach, explains sample solutions per approach, compares the cross-platform mobile development solutions, and ends with the open research areas.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2015.08.004
  • A hybrid particle swarm optimization and genetic algorithm with population
           partitioning for large scale optimization problems

    • Authors: Ahmed F. Ali; Mohamed A. Tawhid
      Pages: 191 - 206
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Ahmed F. Ali, Mohamed A. Tawhid
      In this paper, a new hybrid particle swarm optimization and genetic algorithm is proposed to minimize a simplified model of the energy function of the molecule. The proposed algorithm is called Hybrid Particle Swarm Optimization and Genetic Algorithm (HPSOGA). The HPSOGA is based on three mechanisms. The first mechanism is applying the particle swarm optimization to balance between the exploration and the exploitation process in the proposed algorithm. The second mechanism is the dimensionality reduction process and the population partitioning process by dividing the population into sub-populations and applying the arithmetical crossover operator in each sub-population in order to increase the diversity of the search in the algorithm. The last mechanism is applied in order to avoid the premature convergence and avoid trapping in local minima by using the genetic mutation operator in the whole population. Before applying the proposed HPSOGA to minimize the potential energy function of the molecule size, we test it on 13 unconstrained large scale global optimization problems with size up to 1000 dimensions in order to investigate the general performance of the proposed algorithm for solving large scale global optimization problems then we test the proposed algorithm with different molecule sizes with up to 200 dimensions. The proposed algorithm is compared against the standard particle swarm optimization to solve large scale global optimization problems and 9 benchmark algorithms, in order to verify the efficiency of the proposed algorithm for solving molecules potential energy function. The numerical experiment results show that the proposed algorithm is a promising and efficient algorithm and can obtain the global minimum or near global minimum of the molecular energy function faster than the other comparative algorithms.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.07.008
  • Arc Based Ant Colony Optimization Algorithm for optimal design of
           gravitational sewer networks

    • Authors: R. Moeini; M.H. Afshar
      Pages: 207 - 223
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): R. Moeini, M.H. Afshar
      In this paper, constrained and unconstrained versions of a new formulation of Ant Colony Optimization Algorithm (ACOA) named Arc Based Ant Colony Optimization Algorithm (ABACOA) are augmented with the Tree Growing Algorithm (TGA) and used for the optimal layout and pipe size design of gravitational sewer networks. The main advantages offered by the proposed ABACOA formulation are proper definition of heuristic information, a useful component of the ant-based algorithms, and proper trade-off between the two conflicting search attributes of exploration and exploitation. In both the formulations, the TGA is used to incrementally construct feasible tree-like layouts out of the base layout. In the first formulation, unconstrained version of ABACOA is used to determine the nodal cover depths of sewer pipes while in the second formulation, a constrained version of ABACOA is used to determine the nodal cover depths of sewer pipes which satisfy the pipe slopes constraint. Three different methods of cut determination are also proposed to complete the construction of a tree-like network containing all base layout pipes, here. The proposed formulations are used to solve three test examples of different scales and the results are presented and compared with other available results in the literature. Comparison of the results shows that best results are obtained using the third cutting method in both the formulations. In addition, the results indicate the ability of the proposed methods and in particular the constrained version of ABACOA equipped with TGA to solve sewer networks design optimization problem. To be specific, the constrained version of ABACOA has been able to produce results 0.1%, 1% and 2.1% cheaper than those obtained by the unconstrained version of ABACOA for the first, second and the third test examples, respectively.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.03.003
  • MHD boundary layer flow and heat transfer in an inclined porous square
           cavity filled with nanofluids

    • Authors: Chandra Shekar Balla; Naikoti Kishan; Rama S.R. Gorla; B.J. Gireesha
      Pages: 237 - 254
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Chandra Shekar Balla, Naikoti Kishan, Rama S.R. Gorla, B.J. Gireesha
      The present paper deals with the magnetohydrodynamic boundary layer flow of a free convection heat transfer in an inclined square cavity filled with nanofluid-saturated porous medium. The effects of different nanoparticles Cu, Al2O3, TiO2 and SiO2 are considered. The top and bottom horizontal walls of cavity are considered adiabatic, while the vertical walls are kept at constant temperatures. The governing partial differential equations are solved by finite element method of Galerkin weighted residual scheme. Numerical results are obtained for different values of the Rayleigh number, angle of inclination, magnetic field and nanofluid volume fraction. The overall investigation of variation of streamlines, isotherms and Nusselt numbers is presented graphically. To examine the accuracy, the present results are compared with the available results.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.02.010
  • Synthesis, characterization and performance of CoxNi1−xS compounds for
           application in lithium batteries

    • Authors: Atef Y. Shenouda; N. Munichandraih
      Pages: 255 - 261
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Atef Y. Shenouda, N. Munichandraih
      This study reports a process to prepare Co x Ni1− x S (x =0, 0.25, 0.5, 0.75 and 1) samples by hydrothermal process at 250°C using stoichiometric weight ratios of raw materials. The prepared powder samples were annealed in Ar atmosphere at 450°C for 3h. The crystal structure of prepared annealed Co x Ni1− x S samples was characterized by XRD. SEM investigations were carried out explaining the morphology of these samples. Electrochemical impedance spectra (EIS) measurements, Cyclic voltammetric (CV) and galvanostatic measurements were carried out. The life cycle performance was carried out for the cells and Li/Co0.25Ni0.75S cell gave specific discharge capacities of about 330mAhg−1.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.06.006
  • Investigation on cascade multilevel inverter with symmetric, asymmetric,
           hybrid and multi-cell configurations

    • Authors: Y. Suresh; J. Venkataramanaiah; Anup Kumar Panda; C. Dhanamjayulu; P. Venugopal
      Pages: 263 - 276
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): Y. Suresh, J. Venkataramanaiah, Anup Kumar Panda, C. Dhanamjayulu, P. Venugopal
      In recent past, numerous multilevel architectures came into existence. In this background, cascaded multilevel inverter (CMLI) is the promising structure. This type of multilevel inverters synthesizes a medium voltage output based on a series connection of power cells which use standard low-voltage component configurations. This characteristic allows one to achieve high-quality output voltage and current waveforms. However, when the number of levels increases switching components and the count of dc sources are also increased. This issue became a key motivation for the present paper. The present paper is devoted to investigate different types of CMLI which use less number of switching components and dc sources and finally proposed a new version of Multi-cell based CMLI. In order to verify the proposed topology, MATLAB – simulations and hardware verifications are carried out and results are presented.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.09.006
  • Computational study of Jeffrey’s non-Newtonian fluid past a
           semi-infinite vertical plate with thermal radiation and heat

    • Authors: S. Abdul Gaffar; V. Ramachandra Prasad; E. Keshava Reddy
      Pages: 277 - 294
      Abstract: Publication date: June 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 2
      Author(s): S. Abdul Gaffar, V. Ramachandra Prasad, E. Keshava Reddy
      The nonlinear, steady state boundary layer flow, heat and mass transfer of an incompressible non-Newtonian Jeffrey’s fluid past a semi-infinite vertical plate is examined in this article. The transformed conservation equations are solved numerically subject to physically appropriate boundary conditions using a versatile, implicit finite-difference Keller box technique. The influence of a number of emerging non-dimensional parameters, namely Deborah number (De), ratio of relaxation to retardation times (λ), Buoyancy ratio parameter (N), suction/injection parameter (fw ), Radiation parameter (F), Prandtl number (Pr), Schmidt number (Sc), heat generation/absorption parameter (Δ) and dimensionless tangential coordinate (ξ) on velocity, temperature and concentration evolution in the boundary layer regime is examined in detail. Also, the effects of these parameters on surface heat transfer rate, mass transfer rate and local skin friction are investigated. This model finds applications in metallurgical materials processing, chemical engineering flow control, etc.

      PubDate: 2017-06-17T02:59:03Z
      DOI: 10.1016/j.asej.2016.09.003
  • Optimal operation of power system incorporating wind energy with demand
           side management

    • Authors: M.H. Alham; M. Elshahed; Doaa Khalil Ibrahim; Essam El Din Abo El Zahab
      Pages: 1 - 7
      Abstract: Publication date: March 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 1
      Author(s): M.H. Alham, M. Elshahed, Doaa Khalil Ibrahim, Essam El Din Abo El Zahab
      The high penetration of the wind energy in the power systems raises some issues such as ramping and mismatch between the wind power and power demand. One of the possible solutions to these issues is the demand side management (DSM). In this paper, dynamic economic dispatch (DED) incorporating different penetration levels of wind energy and utilizing the DSM is proposed to solve the issues related to high penetration of wind energy. The effect of utilizing the DSM on the operation cost with different test cases is discussed. The General Algebraic Modeling System (GAMS) using BARON as a solver and genetic algorithm (GA) with hybrid function are used to solve the proposed DED model and a comparison between them is assessed. The proposed model is applied to a six units’ generation system to test the effectiveness of the proposed model.

      PubDate: 2017-03-20T18:50:19Z
      DOI: 10.1016/j.asej.2015.07.004
  • Power system security enhancement with unified power flow controller under
           multi-event contingency conditions

    • Authors: S. Ravindra; Chintalapudi V. Suresh; S. Sivanagaraju; V.C. Veera Reddy
      Pages: 9 - 28
      Abstract: Publication date: March 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 1
      Author(s): S. Ravindra, Chintalapudi V. Suresh, S. Sivanagaraju, V.C. Veera Reddy
      Power system security analysis plays key role in enhancing the system security and to avoid the system collapse condition. In this paper, a novel severity function is formulated using transmission line loadings and bus voltage magnitude deviations. The proposed severity function and generation fuel cost objectives are analyzed under transmission line(s) and/or generator(s) contingency conditions. The system security under contingency conditions is analyzed using optimal power flow problem. An improved teaching learning based optimization (ITLBO) algorithm has been presented. To enhance the system security under contingency conditions in the presence of unified power flow controller (UPFC), it is necessary to identify an optimal location to install this device. Voltage source based power injection model of UPFC, incorporation procedure and optimal location identification strategy based on line overload sensitivity indexes are proposed. The entire proposed methodology is tested on standard IEEE-30 bus test system with supporting numerical and graphical results.

      PubDate: 2017-03-20T18:50:19Z
      DOI: 10.1016/j.asej.2015.07.006
  • Effect of using swimmer bars on the behavior of normal and high strength
           reinforced concrete beams

    • Authors: Heba A. Mohamed
      Pages: 29 - 37
      Abstract: Publication date: March 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 1
      Author(s): Heba A. Mohamed
      Shear failure of RC beams is often sudden and catastrophic. The shear cracks progress rapidly without warning, and the diagonal cracks are considerably wider than the flexural cracks. In this study, two types of shear reinforcement are used, traditional stirrups and swimmer bars. Swimmer bar system is a new type of shear reinforcement defined as inclined bars welded to longitudinal top and bottom bars. High strength concrete is a more brittle material than normal strength concrete, and the cracks that form in high strength concrete will propagate more extensively than in normal strength concrete. Ten beams are tested, and the main variables investigated were two different shapes of swimmer bars in addition to traditional stirrups, number of swimmer bar planes, and compressive strength of concrete. The test results will be presented and discussed in order as deflection, ultimate loads, ultimate shear stress, cracking stress and failure modes. Moreover, shear strain is calculated.

      PubDate: 2017-03-20T18:50:19Z
      DOI: 10.1016/j.asej.2015.07.007
  • Application of the finite element method for investigating the dynamic
           plate loading test

    • Authors: Mohamed M. Tawfik; Yasser M. El-Mossallamy
      Pages: 39 - 49
      Abstract: Publication date: March 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 1
      Author(s): Mohamed M. Tawfik, Yasser M. El-Mossallamy
      The dynamic plate loading test using the Light Falling Weight Deflectometer (LFWD) is an innovative and very simple method used for quick assessment of the field compaction quality. The basic outcome of the LFWD test is the dynamic resilience modulus of the tested soil. This paper concisely presents the state-of-the-art for the theory and applications of the LFWD test. Moreover, an attempt is made in this study to use the finite element method for simulating the LFWD test and investigating the consequent soil response. An axisymmetric model is established to simulate a realistic case study of in-situ LFWD test. Different soil models are examined for adequately simulating the soil performance, including linear elastic, Mohr–Coulomb and Hardening-Soil models. The finite element analysis is applied to investigate the factors that probably affect the LFWD results. Furthermore, an attempt to ascertain the influence depth of the LFWD is provided.

      PubDate: 2017-03-20T18:50:19Z
      DOI: 10.1016/j.asej.2015.08.011
  • Study of nanoparticles deposition in a human upper airway model using a
           dynamic turbulent Schmidt number

    • Authors: Ehab M. Mina; Ghader Ghorbaniasl; Chris Lacor
      Abstract: Publication date: Available online 12 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Ehab M. Mina, Ghader Ghorbaniasl, Chris Lacor
      In this paper, the nanoparticles deposition in the upper portion of the human respiratory system is studied by using a dynamic turbulent Schmidt number. The flow and particle governing equations are solved using large eddy simulation (LES) with a localized dynamic subgrid scale closure of the residual stress tensor and the scalar flux term. The flow solution and the particle transport are dynamically coupled and thus, the turbulent momentum and mass diffusivity are calculated from the resolved flow and particle concentration fields. The methodology is applied to an extrathoracic oral airway model for several particle diameters ranging from 10nm to 52nm at a breathing rate of 30L/min. The results are compared to the previously published RANS and experimental data. It is observed that the current methodology improves the quality of results for flow and particle deposition considerably. It is also noticed that the turbulent Schmidt number is quite different from its typically assumed values.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.05.002
  • Linear free vibration of micro-/nano-plates with cut-out in thermal
           environment via modified couple stress theory and Ritz method

    • Authors: Sima Ziaee
      Abstract: Publication date: Available online 8 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Sima Ziaee
      This article aims to study the natural frequency of defective micro-/nano-plates because not only the existence of cut-outs in plates may be essential on the basis of their desired functionality but also the resonant frequency can be changed by cut-outs. In this study, the modified couple stress theory is combined with Kirchhoff thin plate hypothesis to incorporate size effect to classical plate theory. The Rayleigh-Ritz method is employed to derive discrete equations of motion which yields eigenvalue problem. In the ‘numerical results’ section, the effects of different boundary conditions, location of the cut-out, side-length to thickness ratio and a rise in the temperature on dimensionless fundamental frequency of polysilicon micro-plates are studied. Results demonstrate that the natural frequency of micro-plate, the cut out of which is far from the plate center is more than that of micro-plate with a square hole close to the plate center.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.05.003
  • Nanoparticles as additive in biodiesel on the working characteristics of a
           DI diesel engine

    • Authors: Prabu
      Abstract: Publication date: Available online 8 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): A. Prabu
      This experimental work investigates the performance, combustion and emission characteristics of a single cylinder direct injection (DI) diesel engine with three fuel series: biodiesel–diesel (B20), biodiesel–diesel–nanoparticles (B20A30C30) and biodiesel–nanoparticles (B100A30C30). The nanoparticles such as Alumina (Al2O3) and Cerium oxide (CeO2) of each 30ppm are mixed with the fuel blends by means of an ultrasonicator, to attain uniform suspension. Owing to the higher surface area/volume ratio characteristics of nanoparticles, the degree of mixing and chemical reactivity are enhanced during the combustion, attaining better performance, combustion and emission attributes of the diesel engine. The brake thermal efficiency of the engine for the nanoparticles dispersed test fuel (B20A30C30) significantly improved by 12%, succeeded by 30% reduction in NO emission, 60% reduction in carbon monoxide emission, 44% reduction in hydrocarbon emission and 38% reduction in smoke emission, compared to that of B100.

      PubDate: 2017-07-12T17:50:03Z
  • Design of 10T full adder cell for ultralow-power applications

    • Authors: Vishesh Dokania; Richa Verma; Manisha Guduri; Aminul Islam
      Abstract: Publication date: Available online 8 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Vishesh Dokania, Richa Verma, Manisha Guduri, Aminul Islam
      This research paper performs symmetrical transient response analysis of FO4 inverter logic gate at 16-nm technology node. It is observed that symmetry is obtained at the aspect ratio (β) is equal to 3.52. With this β ratio, minimum energy point is investigated and found to be 0.15V. At this minimum energy point, this research paper proposes an ultralow-power 10T 1-bit full adder circuit at 16-nm technology node in subthreshold region for energy constraint applications. It exhibits superior performance in terms of design metrics like propagation delay, average power, leakage power and energy at optimum supply voltage i.e., at 0.15V. The proposed design achieves 1.81×, 3.39×, 2.25×, and 6.12× improvement in propagation delay, average power dissipation, leakage power dissipation and energy compared to conventional 1-bit full adder circuit. The proposed design exhibits 1.02× improvement in average power variability.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.05.004
  • Three-dimensional flow of Jeffrey fluid between a rotating and stationary
           disks with suction

    • Authors: P. Maninaga Kumar; A. Kavitha
      Abstract: Publication date: Available online 6 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): P. Maninaga Kumar, A. Kavitha
      A three-dimensional steady flow of an incompressible Jeffrey fluid bounded by two parallel circular disks, one rotating and other stationary is examined with uniform suction at the stationary disk. Solutions for the governing equations are obtained applying “Power series method”. The velocity distributions, pressure coefficient and skin frictions are obtained which in turn are compared with assumptions of creeping flow solutions. The velocity distribution and pressure coefficient are discussed graphically. We found that the radial velocity increases and axial velocity decreases when Jeffrey parameter is increased.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.04.003
  • Prediction of fatigue crack initiation life in railheads using finite
           element analysis

    • Authors: H.M. El-sayed; M. Lotfy; H.N. El-din Zohny; H.S. Riad
      Abstract: Publication date: Available online 6 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): H.M. El-sayed, M. Lotfy, H.N. El-din Zohny, H.S. Riad
      The current study introduced a numerical procedure to study fatigue crack initiation life in railheads. It was mainly performed by a three-dimensional (3D) explicit finite element (FE) model that accounts for bending stresses due to global dynamic response of railway track and local stresses due to wheel-rail contact loads. The results obtained from FE analysis were combined with the critical plane approach and multiaxial low cyclic fatigue mode to predict crack orientation and fatigue crack initiation life. This model was applied to a case study in the first line of Greater Cairo Underground Metro (GCUM) in Egypt. The advantages of the proposed model are that it can represent realistic wheel-rail contact geometry and non-linearity of material behavior together with dynamic response and cyclic loading. A good agreement of cracks orientations and locations of the field observations with the predicted ones based on FE results was achieved.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.06.003
  • Propagation of longitudinal viscoelastic stress waves in a fluid saturated
           Voigt porous medium

    • Authors: Ahmad Barzkar; Hojatollah Adibi
      Abstract: Publication date: Available online 6 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Ahmad Barzkar, Hojatollah Adibi
      This paper is concerned with giving a simple mathematical model on the propagation of longitudinal stress waves in a Voigt viscoelastic porous media. This model is congruent with the Frankel-Biot theory and describes the differences between vibrations of solid and liquid parts of porous medium. Furthermore, this model shows that there is a critical value of frequency that depends on the relaxation coefficient, and by this critical frequency value, stress waves are divided into two low and high frequency ranges. It is also demonstrated that behavior of stress waves differs between these two different ranges. It is normally expected that increasing attenuation yields to decreased phase velocity, but contrary to our expectation, in the propagation of slow waves in the low frequency range, increasing attenuation leads to increased phase velocity. In the high frequency range this holds true regarding the propagation of both fast and slow waves.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.03.011
  • Experimental and numerical investigations of the Laplacian and Poissonian
           field in asymmetric multiple-electrode systems for electrostatic
           separation processes

    • Authors: Mohamed A. Abouelatta; Abd-Elhadi R. Salama
      Abstract: Publication date: Available online 5 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Mohamed A. Abouelatta, Abd-Elhadi R. Salama
      The paper presents an experimental measurements and numerical computations of the electric field in Laplacian field model as well as Poissonian field model for various asymmetric multiple-electrode configurations prepared to electrostatic separation processes. The asymmetric multiple-electrode systems utilize additional cylindrical rods and/or L-plates connected at constant or floating potential, as in practical applications. The geometries include a cluster of spherical/cylindrical conducting particles uniformly distributed and simultaneously in contact with the ground plate. The charge simulation method integrated with genetic algorithm and method of characteristics is employed for numerical computation and analysis of the electric field in the presented models. Neglecting Deutch’s assumption, the numerical technique is applied to solve Laplace's equation or Poisson's equation with the current-continuity relation. Influence of the cluster of spherical/cylindrical particles on the electric field distribution on the ground plate surface, and its acquired charged, is established. I-V characteristics and the spatial distributions of current density and electric field are evaluated and assessed. The experimental results were found to be in a good agreement with analytical values.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.05.005
  • Comparison of Lagrange multipliers for telegraph equations

    • Authors: Muhammad Hamid; Muhammad Usman; Tamour Zubair; Syed Tauseef Mohyud-Din
      Abstract: Publication date: Available online 5 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Muhammad Hamid, Muhammad Usman, Tamour Zubair, Syed Tauseef Mohyud-Din
      In this paper, we likewise calculate exact langrage multiplier and it progressively connects to the definite results of telegraph equations. This study witnesses the advantages of Exact Lagrange multipliers and their coupling with Variational Iteration Method. Computational work reflects that use of exact Lagrange multipliers reduces the computational work to a tangible level and also increase the level of accuracy. Moreover, exact Lagrange multiplier reduce the successive application of integral operator and are more user friendly.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2016.08.002
  • Properties of concrete incorporating locally produced Portland limestone

    • Authors: Fatma Shaker; Ahmed Rashad; Mohamed Allam
      Abstract: Publication date: Available online 5 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Fatma Shaker, Ahmed Rashad, Mohamed Allam
      Blended cements are increasingly being used in concrete to reduce the amount of clinker in the cement, thus achieving both economic and environmental gains. The use of limestone as a component of Portland cement is now common practice worldwide. Reducing the amount of cement clinker with limestone additions is considered a highly efficient way of saving natural resources, saving energy and lowering the carbon dioxide emissions. The main objective of this research is to investigate the effect of using locally produced Portland limestone cement (PLC) on the concrete characteristics. Tests determining the fresh, hardened and durability properties of concrete were conducted on PLC concrete specimens and then compared to similar results of concrete made with Ordinary Portland cement. This investigation concluded that concrete made with CEM II (A-L) accomplished competitive results with OPC CEM I 42.5 concrete. Furthermore, all PLC concretes achieved lower water permeability compared to OPC concretes.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.04.005
  • Stress-dependent consolidation characteristics of marine clay in the
           Northern Arabian Gulf

    • Authors: Tamer Elkateb
      Abstract: Publication date: Available online 4 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Tamer Elkateb
      The main objective of this paper is to study the variation of the coefficient of consolidation (Cv) with stress level for the marine clay in the Northern Arabian Gulf. Undisturbed samples were collected from three sites and laboratory-tested using the conventional Oedometer test. The variation of permeability with applied stress was expressed in terms of the Permeability Change Index. The Coefficient of Consolidation Change Index was introduced as a new parameter to quantify the change in Cv with stress level. Region-specific correlations were developed between these two indices and the Liquid Limit. The uncertainty in these correlations was quantified using statistical techniques and was found to be higher in the case of Cv. Accordingly, risk-based correction factors were introduced based on the target probability of unsatisfactory performance. Finally, a simplified methodology was proposed to estimate the stress-dependent Cv in the absence of site-specific consolidation tests.

      PubDate: 2017-07-12T17:50:03Z
      DOI: 10.1016/j.asej.2017.05.001
  • Innovative understanding of the duality confusion, the photovoltaic and
           magnetocaloric effects

    • Authors: Salama Abdelhady
      Abstract: Publication date: Available online 24 June 2017
      Source:Ain Shams Engineering Journal
      Author(s): Salama Abdelhady
      Innovation in engineering requires clear understanding of physics of the concerned phenomena in any engineering application. This article gives clear scientific answers of two disturbing questions concerning fundamental phenomena in any electromagnetic system: “Is the light a flow of waves or particles'” and “Is the electric current a flow of particles or waves'” Such answers solve a puzzle in physics literature called the duality confusion and lead to innovative understandings of two interesting phenomena; the photovoltaic and magnetocaloric effects. Having such innovative understanding, it was possible to introduce in this paper verified concepts to robust designs of multijunction solar cells, optical fibers and magnetocaloric refrigerators. It was also possible to introduce a universal system of units that deletes redundancies in the SI system of units. At the end; it was shown that the results of Faraday’s experiment, known as Faraday’s effect, represent a proof of the introduced innovative understanding.

      PubDate: 2017-07-02T23:51:08Z
      DOI: 10.1016/j.asej.2017.03.006
  • Investigation and analysis of scour downstream of a spillway

    • Authors: E.A. Elnikhely
      Abstract: Publication date: Available online 2 June 2017
      Source:Ain Shams Engineering Journal
      Author(s): E.A. Elnikhely
      Local scour downstream of spillways due to hydraulic jump is considered the most complicated and tedious problems which threats the overall stability of the spillway. Throughout this paper, eighty experimental runs were carried out to investigate the effect of using cylinder blocks fixed on the back slope of the spillway on the scour hole dimensions downstream of spillway under different flow conditions. Case of smooth spillway was included to estimate the influence of the considered modifications. Experiments were performed using different diameters, lengths, and arrangements of cylinder blocks with different discharges. Data collected from the experiments were analyzed and graphically introduced. Furthermore, experimental data for smooth spillway were compared with scour formulae for other researchers. Finally simple formulae were predicted to estimate the different scour and deposition parameters. Use of concrete cylinder blocks will assist engineers in the design of spillways.

      PubDate: 2017-06-06T23:33:20Z
      DOI: 10.1016/j.asej.2017.03.008
  • Numerical simulation of fifth order KdV equations occurring in
           magneto-acoustic waves

    • Authors: Amit Goswami; Jagdev Singh; Devendra Kumar
      Abstract: Publication date: Available online 29 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Amit Goswami, Jagdev Singh, Devendra Kumar
      In this work, we aim to apply a numerical approach based on Homotopy perturbation transform method (HPTM) for derive the exact and approximate solutions of nonlinear fifth order KdV equations for study magneto-acoustic waves in plasma. The approach is a mixed form of the standard Laplace transform with the classical Homotopy perturbation technique. Nonlinear term can be handled with the aid of He's Polynomials. In this technique, the solution is calculated in the form of a convergent series and convergence of the HPTM solutions to the exact solutions is shown. The Homotopy perturbation transform method presents a wide applicability to handling nonlinear wave equations in science and engineering. As a novel application of HPTM, the present work shows some essential difference with the existing similar method. Several examples are provided for illustrate the simplicity and reliability of the method and highlighted the significance of this work.

      PubDate: 2017-06-02T20:24:05Z
      DOI: 10.1016/j.asej.2017.03.004
  • Artificial neural controller for torque ripple control and maximum power
           extraction for wind system driven by switched reluctance generator

    • Authors: Naggar Saad; Ahmed El-Sattar Mohamed Metally
      Abstract: Publication date: Available online 26 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Naggar H. Saad, Ahmed A. El-Sattar, Mohamed E. Metally
      Torque ripples and maximum power tracking form the most important problems facing Wind Energy Conversion System (WECS). This paper presents modified toque ripple minimization algorithm of four phases 8/6 poles Switched Reluctance Generator (SRG) using Artificial Neural Network (ANN) control. This control algorithm is based on optimum profiling of the generator phase currents during overlapping periods. The paper, also, introduces new Maximum Power Point Tracking (MPPT) for SRG by modifying the classical Hill Climb Searching (HCL) technique using ANN which is designed to emulate the PI controller for closed loop operation under different wind speeds. Moreover multi level diode clamped inverter is used for connecting SRG to the grid in order to reduce Total Harmonic Distortion (THD) to about 1.45% and reduce filter size. The simulation results show good agreement and support the feasibility of the proposed torque ripple minimization and MPPT techniques.

      PubDate: 2017-05-28T17:02:11Z
  • New switching approach for DVR using one cycle control method

    • Authors: Seyed Abbas; Taher Hosein Tahami Fard Ehsan Boloor Kashani
      Abstract: Publication date: Available online 25 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Seyed Abbas Taher, Hosein Tahami Fard, Ehsan Boloor Kashani
      One of the effective devices to eliminate voltage disturbances of sensitive loads in distribution systems is dynamic voltage restorer (DVR). In previous studies, the sinusoidal pulse width modulation (SPWM) method has been used as a switching method for DVR. However, a new switching approach called “one cycle control” (OCC) is presented in this paper for a three-phase DVR which has higher performance in dynamic and steady state operations compared to SPWM and is also simple and fixed in frequency. Moreover, this approach has few uncomplicated steps which make it suitable for practical implementation. In this study, the ability of the proposed approach is evaluated on two different types of DVR. The first DVR has fictitious dc link. In the second DVR, a battery is used in dc link. The proposed method can improve power quality disturbances such as voltage sag, voltage swell, and flicker. The ability of operating under changing parameters of load can show the robustness of the proposed approach. The simulation results obtained by OCC in six case studies were compared to the results obtained using the PWM method, revealing the higher efficiency of OCC than the PWM method.

      PubDate: 2017-05-28T17:02:11Z
  • Competency mapping with Sugeno fuzzy inference system for variable pay
           determination: A case study

    • Authors: Sushri Samita Rout; Bijan Bihari Misra; Sasmita Samanta
      Abstract: Publication date: Available online 24 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Sushri Samita Rout, Bijan Bihari Misra, Sasmita Samanta
      In this work we propose a novel approach for computing the variable pay/pay for performance component of employees in a technical institution based on Takagi Sugeno Kang (TSK)/Sugeno fuzzy inference system. Sugeno fuzzy inference system is an inference model based on fuzzy set theory and is known to handle MCDM (Multiple criteria decision making) problems quite efficiently. In the proposed model the Sugeno fuzzy inference system has been used to compute the variable pays of the faculties based on their individual API (Academic Performance Indicator) scores in a particular appraisal year. The model aims to overcome the pitfalls of the current forced distribution technique being used for appraisal and subsequent variable pay decisions. The performance of the proposed model has been tested with the API scores of all the faculties of the said institute. Along with that a function was used to generate random inputs in the range of API scores to extensively test the model. All the methods were implemented in MATLAB and the results were analyzed in EXCEL using the CORREL and PEARSON’s coefficient. Experimental results show that the proposed model is reliable and demonstrates significant improvement over the traditional forced distribution approach currently adopted.

      PubDate: 2017-05-28T17:02:11Z
      DOI: 10.1016/j.asej.2017.03.007
  • Improved bacterial foraging optimization for grid connected wind energy
           conversion system based PMSG with matrix converter

    • Authors: Naggar H. Saad; Ahmed A. El-Sattar; Mohamed E. Marei
      Abstract: Publication date: Available online 24 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Naggar H. Saad, Ahmed A. El-Sattar, Mohamed E. Marei
      This paper proposes an improved fast dynamic system for controlling Matrix Converter (MC) based on modified hysteresis current controller using optimal tuning PI controller. An improved Bacterial Foraging Optimization (BFO) technique is employed for controlling the active and reactive current components of the Permanent Magnet Synchronous Generator (PMSG) to extract the maximum power from the wind. This proposed controller has the ability to supply the grid by both active and reactive power at normal and fault conditions. Dynamic limiter is employed with the proposed improved BFO controller to control the injected reactive power to the grid during Low Voltage Ride Through (LVRT) at a range limited by MC rated current to improve the system stability. The pitch angle controller with rate limiter was implemented in the proposed controller to protect WECS from mechanical damage. The simulation results prove the validity of the proposed controller under any conditions.

      PubDate: 2017-05-28T17:02:11Z
      DOI: 10.1016/j.asej.2017.03.010
  • A novel control strategy for grid connected hybrid renewable energy
           systems using improved particle swarm optimization

    • Authors: Naggar H. Saad; Ahmed A. El-Sattar; Abd El-Aziz M. Mansour
      Abstract: Publication date: Available online 24 May 2017
      Source:Ain Shams Engineering Journal
      Author(s): Naggar H. Saad, Ahmed A. El-Sattar, Abd El-Aziz M. Mansour
      This paper proposes a novel hybrid centralized and distributed control of hybrid renewable energy system consisting of AC/DC micro grids. An Interlinking Converter (IC) is used to connect both sides of the micro grid systems together. Improved Particle Swarm Optimization (IPSO) which acts as a master controller is used to control the power of the sources based on IC control. Also, there are different slave controllers for 100kW photovoltaic, fuel cells and 100kW wind, which are designed to supply continuous load power. Coordination between two grids is satisfied through droop control for both AC and DC micro grids to achieve power sharing process and control of renewable energy sources supplying different loads. The model has been implemented in MATLAB/SIMULINK. The proposed controller succeeded to manage energy between micro grids under different scenarios. The control technique using IPSO strategy improves the dynamics of the hybrid system connected to the grid.

      PubDate: 2017-05-28T17:02:11Z
      DOI: 10.1016/j.asej.2017.03.009
  • Overlapping domain decomposition method for singularly perturbed third
           order reaction-diffusion problems

    • Authors: J. Christy Roja; A. Tamilselvan
      Abstract: Publication date: Available online 31 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): J. Christy Roja, A. Tamilselvan
      In this paper, we present an analysis of overlapping Schwarz method for singularly perturbed third order reaction-diffusion problems. The Schwarz method invokes two fine mesh subdomains and one coarse mesh subdomain. On each subdomain we use a standard finite difference operator with a uniform mesh. The numerical approximations generated from the method are shown to be almost second order uniformly convergent. Furthermore we show that for small ε , two iterations are sufficient to achieve the expected accuracy. Numerical examples are presented to support the theoretical results.

      PubDate: 2017-04-04T15:36:06Z
      DOI: 10.1016/j.asej.2016.09.018
  • Simulation of counter-current imbibition phenomenon in a double phase flow
           through fracture porous medium with capillary pressure

    • Authors: Hardik S. Patel; Ramakanta Meher
      Abstract: Publication date: Available online 23 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Hardik S. Patel, Ramakanta Meher
      In this paper, the counter-current imbibition phenomenon in a fracture porous media is studied and Adomian decomposition method is applied to find the saturation of wetting phase and the recovery rate of the reservoir. A simulation result is developed for the saturation of wetting phase in fracture matrix and in porous matrix for some interesting choices of parametric value to study the recovery rate of the oil reservoir with dimensionless time. This problem has a great importance in the oil recovery process.

      PubDate: 2017-03-27T21:03:02Z
      DOI: 10.1016/j.asej.2016.09.017
  • A systematic literature review: Refactoring for disclosing code smells in
           object oriented software

    • Authors: Satwinder Singh; Sharanpreet Kaur
      Abstract: Publication date: Available online 22 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Satwinder Singh, Sharanpreet Kaur
      Context Reusing a design pattern is not always in the favor of developers. Thus, the code starts smelling. The presence of “Code Smells” leads to more difficulties for the developers. This racket of code smells is sometimes called Anti-Patterns. Objective The paper aimed at a systematic literature review of refactoring with respect to code smells. However the review of refactoring is done in general and the identification of code smells and anti-patterns is performed in depth. Method A systematic literature survey has been performed on 238 research items that includes articles from leading Conferences, Workshops and premier journals, theses of researchers and book chapters. Results Several data sets and tools for performing refactoring have been revealed under the specified research questions. Conclusion The work done in the paper is an addition to prior systematic literature surveys. With the study of paper the attentiveness of readers about code smells and anti-patterns will be enhanced.

      PubDate: 2017-03-27T21:03:02Z
      DOI: 10.1016/j.asej.2017.03.002
  • Septic B-spline method for second order self-adjoint singularly perturbed
           boundary-value problems

    • Authors: Ram Kishun Lodhi; Hradyesh Kumar Mishra
      Abstract: Publication date: Available online 22 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Ram Kishun Lodhi, Hradyesh Kumar Mishra
      In the present paper, we develop a septic B-spline method for solving a self-adjoint singularly perturbed two-point boundary value problem. This method is applied directly to the numerical solution of the problems without reducing its order. The convergence analysis is also given and the method is shown to have a convergence of order six. Numerical illustrations are given at the end to demonstrate the efficiency of our method by using the MATLAB.

      PubDate: 2017-03-27T21:03:02Z
      DOI: 10.1016/j.asej.2016.09.016
  • Operational matrix based on Genocchi polynomials for solution of delay
           differential equations

    • Authors: Abdulnasir Isah; Chang Phang
      Abstract: Publication date: Available online 21 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Abdulnasir Isah, Chang Phang
      In this paper, we present a new simple and effective algorithm for solving generalized Pantograph equations, delay differential equations with neutral terms and delay differential system with constant and variable coefficients.The new method is based on one of the Appell polynomials, namely Genocchi polynomials. We first introduce the properties of Genocchi polynomials and employed them to construct the operational matrices of derivative. Collocation method based on this operational matrix is used. Error estimate for this scheme based on the Generalized pantograph equations is reproduced. Only few terms of Genocchi polynomials are needed to obtain very good results. Numerical examples with comparison show the simplicity, efficiency and accuracy of the method.

      PubDate: 2017-03-27T21:03:02Z
      DOI: 10.1016/j.asej.2016.09.015
  • Thermophoresis and Soret-Dufour on MHD mixed convection mass transfer over

    • Authors: Hiranmoy Mondal; Dulal Pal; Sewli Chatterjee; Precious Sibanda
      Abstract: Publication date: Available online 18 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Hiranmoy Mondal, Dulal Pal, Sewli Chatterjee, Precious Sibanda
      An analysis is presented to investigate thermophoresis and Soret-Dufour on MHD mixed convective heat and mass transfer of a semi-infinite permeable inclined flat plate in the presence of non uniform heat source/sink and chemical reaction. The governing differential equations are transformed into a set of non-linear coupled ordinary differential equations and solved using a numerical technique with appropriate boundary conditions for various physical parameters. The numerical solution for the governing nonlinear boundary value problem is based on the numerical integration scheme over the entire range of physical parameters. The effects of various physical parameters on the dimensionless velocity, temperature, and concentration profiles are depicted graphically and analyzed in detail. Favorable comparisons with previously published work on various special cases of the problem are obtained. Finally, numerical values of the physical quantities, such as local skin-friction coefficient, the local Nusselt number and the local Sherwood number are presented in tabular form.

      PubDate: 2017-03-20T18:50:19Z
      DOI: 10.1016/j.asej.2016.10.015
  • A multi-objective optimal sizing and siting of distributed generation
           using ant lion optimization technique

    • Authors: Mohammad Jafar Hadidian-Moghaddam; Saber Arabi-Nowdeh; Mehdi Bigdeli; Davood Azizian
      Abstract: Publication date: Available online 15 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Mohammad Jafar Hadidian-Moghaddam, Saber Arabi-Nowdeh, Mehdi Bigdeli, Davood Azizian
      In this paper, a new optimization method is proposed to solve the optimal sizing and siting problem of distributed generation (DG) in a distribution system (DS). The optimization problem is solved using a new ant lion optimizer (ALO) with considering different objectives. These objectives are reduction of purchased energy cost from upstream network (due to DGs’ power generation), reliability improvement, reduction of DGs’ application cost, reduction of DS losses and reduction of buses’ voltage deviation. This problem is solved as a multi-objective optimization (MOO) in addition of a single-objective optimization (SOO). The proposed DGs optimal sizing and siting is implemented on 33 and 69-bus IEEE networks. The obtained results show that the ALO has the best performance in extracting the solution of DGs optimal sizing and siting problem in comparison to particle swarm optimization (PSO) and genetic algorithm (GA).

      PubDate: 2017-03-16T15:18:03Z
      DOI: 10.1016/j.asej.2017.03.001
  • Design and implementation of BGP novel control mechanism (BGP-NCM) based
           on network performance parameters

    • Authors: M.T. Moubarak; Ashraf Diaa Elbayoumy; Mohamed Helmy Megahed
      Abstract: Publication date: Available online 9 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): M.T. Moubarak, Ashraf Diaa Elbayoumy, Mohamed Helmy Megahed
      Border Gateway Protocol (BGP) is the defecto standard routing protocol of the internet and has served as backbone technology for logical routing tasks to provide global connectivity in the world. Unfortunately, there are limitations on network performance factors such as latency or link utilization which are not used in BGP routing decisions. These limitations have a great effect on internet services, especially bandwidth sensitive application, where BGP does not automatically redistribute the traffic over different Multihomed links based on link utilization or latency. In this paper, a novel control mechanism for BGP (BGP-NCM) is proposed. BGP-NCM is a software controller which has been developed and injected in the Enterprise or internet service provider BGP multihomed network to force the traffic redistribution over the available links based on the link utilization or latency. The BGP-NCM has been developed using Python programming language and it consists of three modules which are Monitoring, Traffic Calculation and Configuration modules. BGP-NCM will keep an eye on link utilization by checking the monitoring tool log and when the link utilization reaches a predefined value, the BGP-NCM traffic calculation module will be triggered to determine the amount of traffic and corresponding IP prefix as well as the target link with available bandwidth to accommodate the redistributed traffic. Our results show that BGP-NCM solves the traffic redistribution problem without any change in both BGP protocol and running internet infrastructure.
      Graphical abstract image

      PubDate: 2017-03-16T15:18:03Z
      DOI: 10.1016/j.asej.2017.02.008
  • Evaluation of barley (Hordeum vulgare L.) genotypes for salinity tolerance
           under field conditions using the stress indices

    • Authors: A. Jamshidi; H.R. Javanmard
      Abstract: Publication date: Available online 9 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): A. Jamshidi, H.R. Javanmard
      Developing a suitable method for properly screening barley tolerance under salt stress is of great significance. Barley (an excellent model for the prediction of crop response to climate change) salt tolerance was investigated using stress tolerance indices. The experiments were conducted using 26 barley genotypes at two research sites, without stress (soil salinity=3dS/m) and with stress (soil salinity=14dS/m, and irrigation water of 12dS/m). Using the grain yield under non-stress and stress conditions, the salinity stress indices of barley genotypes including salinity susceptibility index (SSI, 0.68–1.12), tolerance index (TOL, 2570–11877), stress tolerance index (STI, 0.01–0.33), geometric mean productivity (GMP, 1433–7625), and mean productivity (MP, 633–6431) were determined. The ten most tolerant barley genotypes including 4Shur, Torkman, Makouei, Karoon, 5Shur, Bahman, Sahra, Torsh, Reihan and Goharjo were determined by the stress indices. The variation of the stress indices indicated that Nimruz was the most sensitive barley genotype under stress. The stress indices were highly correlated and accordingly useable for determining the relative salt tolerance of barley genotypes. The coefficients of variation were also used as the indicators of barley tolerance under salinity stress by revealing the most and the least variable traits of barley under stress. The findings are of practical significance to agricultural fields with salinity stress, resulting in their higher yield productivity.

      PubDate: 2017-03-16T15:18:03Z
      DOI: 10.1016/j.asej.2017.02.006
  • Numerical study on the effect of the spur dikes on sedimentation pattern

    • Authors: Abolfazl Nazari Giglou; John Alex Mccorquodale; Luca Solari
      Abstract: Publication date: Available online 8 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Abolfazl Nazari Giglou, John Alex Mccorquodale, Luca Solari
      The spur dikes are structures that usually used for flow diversion from erodible wall and they usually create a appropriate path for directing the flow, flood control, protection of external walls, and some other cases. Through modifying the hydraulic conditions and creation of smooth flow, spur dikes can decrease water erosion force and power of sediment transport. In this study, the channel and spur dike related to the Heltz Laboratory model have been simulated using Flow-3D numerical model. The RNG turbulence model has been applied for turbulence modeling. The turbulent flow field around inclined spur dike and the effect of such parameters as angle, hydraulic conditions and sedimentation pattern have been investigated. The results showed that increasing the angle of spur dike affects the length and width of sedimentation area. When angle of spur dike increases from 90 to 120deg, the width and length of the sedimentation area will increase up to about 71 and 92 percent, respectively.

      PubDate: 2017-03-09T11:15:43Z
      DOI: 10.1016/j.asej.2017.02.007
  • Performance analysis of bulk arrival queue with balking, optional service,
           delayed repair and multi-phase repair

    • Authors: Charan Jeet Singh; Madhu Jain; Sandeep Kaur
      Abstract: Publication date: Available online 7 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Charan Jeet Singh, Madhu Jain, Sandeep Kaur
      In this investigation, single repairable server queueing system with bulk input and state dependent rates is analyzed by considering the general distributions for the repair, delay to repair and service processes. The server is capable of rendering two stages of the service in which the first stage service is essential and the second stage service is optional. During the repair, the server has to undergo through m-different compulsory phases of the repair. To examine the steady state behavior and to obtain the various performance indices of the system, the probability generating functions of the queue size distributions are derived by using the supplementary variable technique. By setting the appropriate parameters, some special cases are discussed. The sensitivity analysis is performed by facilitating the numerical results for the suitable illustration.

      PubDate: 2017-03-09T11:15:43Z
      DOI: 10.1016/j.asej.2016.08.025
  • Innovating green products as a mean to alleviate poverty in Upper Egypt

    • Authors: Hamed El-Mously
      Abstract: Publication date: Available online 6 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Hamed El-Mously
      Beginning from August 2010, EGYCOM decided to devote its efforts to combat poverty in Upper Egypt. Based on the UN Human Development report for Egypt, EGYCOM found that 762 of the poorest villages are in the governorates of Assuit, Sohag and Menya in Upper Egypt. Of those 44% are in Menya alone. Poverty has alarming consequences, one of which is migration of youth to big cities or abroad in search for regular wages and better life. A team of 22 members undertook additional research and developed a point system to evaluate the poorest 10 villages in Menya governorate, and the final result pointed to the village of Al Qayat. Palm trees were recognized as an abundant unutilized resource in the village. Many households owned palm trees, and they are an important economic resource for the villagers. In addition, villagers possess a rich cultural and technical heritage, being an accumulation of centuries of their interaction with local resources for the satisfaction of their basis needs. Yet, the drastic change of life style in the village has decreased the need of palm secondary products. This, in turn, has led to the neglect of regular pruning of palm, which has resulted in the increase of danger of fire in palm gardens, as well as the infestation by the red palm weevil threatening the life of the palm. Here innovation has emerged as a necessity to rediscover those neglected palm secondary products with the purposed of alleviating poverty in the villages. New techniques and machinery have been innovated to suit the conditions of work in the village. A wide array of techniques and machining have been innovated for the transformation of palm midribs into strips and mats of regular dimensions to be used as a substitute for imported wood. In order to reach the market, it was necessary to close the loop of innovation. Here the intervention of designers was crucial. Four renounced designers have joined our endeavors by designing new marketable products from palm midrib mats using the uniqueness of palm midrib texture-in comparison with wood- as a competitive advantage. The joint synergetic interaction between the project team responsible for technology development and machine design, on one hand, and the creative product designers, on the other hand, has resulted in successful participation in international furniture and building materials exhibitions paving the route for marketing of palm midrib green products in the local and international markets.

      PubDate: 2017-03-09T11:15:43Z
      DOI: 10.1016/j.asej.2017.02.001
  • Design of conservative, reversible sequential logic for cost efficient
           emerging nano circuits with enhanced testability

    • Authors: Neeraj Kumar Misra; Subodh Wairya; Bibhash Sen
      Abstract: Publication date: Available online 3 March 2017
      Source:Ain Shams Engineering Journal
      Author(s): Neeraj Kumar Misra, Subodh Wairya, Bibhash Sen
      The CMOS faces challenges related to the increment in leakage-current to power-consumption. QCA is a promising alternative to overcome these challenges successfully. On the other hand, reversible logic plays a significant role in quantum-computing. Keeping this technique in mind, a conservative-reversible flip-flops and counter are explored here which will bring QCA and reversible computing together in a single-platform. In synthesizing, a reversible-conservative-quantum-cellular-automata (R-CQCA) is proposed. The proposed D, T, JK and dual-edge master-slave flip-flops advocate an improvement of 20%, 46.6%, 50%, and 36.66% respectively than its counterpart in quantum-cost. Further, the 100% fault-coverage by stuck-fault is framed in R-CQCA, which can be useful for a tester to maintain data-integrity. Also, the R-CQCA layout is implemented in QCA, which achieve some parameters such as cell-complexity of 177, leakage-energy-dissipation of 0.1055eV, and size of 0.24µm2. Moreover, R-CQCA is better than FRG, RM, PPRG and MX-cqca regarding QCA-primitives are reported here.

      PubDate: 2017-03-03T07:39:02Z
      DOI: 10.1016/j.asej.2017.02.005
  • Impact of asymmetric lamp positioning on the performance of a
           closed-conduit UV reactor

    • Authors: Tipu Sultan; Zeshan Ahmad; Zahid Anwar; Muhammad Shahzad Khurram
      Abstract: Publication date: Available online 16 February 2017
      Source:Ain Shams Engineering Journal
      Author(s): Tipu Sultan, Zeshan Ahmad, Zahid Anwar, Muhammad Shahzad Khurram
      Computational fluid dynamics (CFD) analyses for the performance improvement of a closed-conduit ultraviolet (UV) reactor were performed by changing the lamp positions from symmetric to asymmetric. The asymmetric lamp positioning can be useful for UV reactor design and optimization. This goal was achieved by incorporating the two performance factors, namely reduction equivalent dose (RED) and system dose performance. Four cases were carried out for asymmetric lamp positioning within the UV reactor chamber and each case consisted of four UV lamps that were simulated once symmetrically and four times asymmetrically. The results of the four asymmetric cases were compared with the symmetric one. Moreover, these results were evaluated by using CFD simulations of a closed-conduit UV reactor. The fluence rate model, UVCalc3D was employed to validate the simulations results. The simulation results provide detailed information about the dose distribution, pathogen track modeling and RED. The RED value was increased by approximately 15% by using UVCalc3D fluence rate model. Additionally, the asymmetric lamp positioning of the UV lamps had more than 50% of the pathogens received a better and a higher UV dose than in the symmetric case. Consequently, the system dose performance was improved by asymmetric lamp positioning. It was concluded that the performance parameters (higher RED and system dose performance) were improved by using asymmetric lamp positioning.

      PubDate: 2017-02-24T01:46:18Z
      DOI: 10.1016/j.asej.2016.08.022
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