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  Subjects -> ENGINEERING (Total: 2270 journals)
    - CHEMICAL ENGINEERING (191 journals)
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    - ELECTRICAL ENGINEERING (99 journals)
    - ENGINEERING (1199 journals)
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ENGINEERING (1199 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (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: 215)
Acta Geotechnica     Hybrid Journal   (Followers: 6)
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: 10)
Adıyaman Üniversitesi Mühendislik Bilimleri Dergisi     Open Access  
Adsorption     Hybrid Journal   (Followers: 4)
Advanced Engineering Forum     Full-text available via subscription   (Followers: 4)
Advanced Science     Open Access   (Followers: 4)
Advanced Science Focus     Free   (Followers: 3)
Advanced Science Letters     Full-text available via subscription   (Followers: 5)
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: 9)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 19)
Advances in Human Factors/Ergonomics     Full-text available via subscription   (Followers: 23)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
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: 35)
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: 28)
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: 27)
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: 8)
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)
Arkiv för Matematik     Hybrid Journal   (Followers: 1)
ASEE Prism     Full-text available via subscription   (Followers: 2)
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: 7)
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: 7)
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: 3)
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: 16)
Biomedical Engineering, IEEE Transactions on     Hybrid Journal   (Followers: 31)
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: 1)
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     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
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: 2)
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: 23)
Composite Interfaces     Hybrid Journal   (Followers: 6)
Composite Structures     Hybrid Journal   (Followers: 252)
Composites Part A : Applied Science and Manufacturing     Hybrid Journal   (Followers: 176)
Composites Part B : Engineering     Hybrid Journal   (Followers: 223)
Composites Science and Technology     Hybrid Journal   (Followers: 165)
Comptes Rendus Mécanique     Full-text available via subscription   (Followers: 2)
Computation     Open Access  
Computational Geosciences     Hybrid Journal   (Followers: 12)
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: 25)
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: 8)
Computing and Visualization in Science     Hybrid Journal   (Followers: 6)
Computing in Science & Engineering     Full-text available via subscription   (Followers: 25)
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: 41)
Control Theory and Informatics     Open Access   (Followers: 7)
Corrosion Science     Hybrid Journal   (Followers: 24)
CT&F Ciencia, Tecnologia y Futuro     Open Access  
CTheory     Open Access  

        1 2 3 4 5 6 | Last

Journal Cover Alexandria Engineering Journal
  [SJR: 0.436]   [H-I: 12]   [1 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 1110-0168
   Published by Elsevier Homepage  [3031 journals]
  • Computer aided diagnosis of pulmonary hamartoma from CT scan images using
           ant colony optimization based feature selection

    • Authors: J. Dhalia Sweetlin; H. Khanna Nehemiah; A. Kannan
      Abstract: Publication date: Available online 17 May 2017
      Source:Alexandria Engineering Journal
      Author(s): J. Dhalia Sweetlin, H. Khanna Nehemiah, A. Kannan
      Background Computer-aided diagnosis (CAD) systems for the detection of lung disorders play an important role in clinical decision making. CAD systems provide a second opinion to the physician in interpreting computed tomography (CT) images. In this work, a CAD system to diagnose pulmonary hamartoma nodules from chest CT images is proposed. Methods Segmentation of lung parenchyma from CT images is carried out using Otsu’s thresholding method. Nodules are considered to be the region of interests (ROIs) in this work. Texture, shape and run length based features are extracted from the ROIs. Cosine similarity measure (CSM) and rough dependency measure (RDM) are used independently as filter evaluation functions with ant colony optimization (ACO) to select two subsets of features. The selected subsets are used to train two classifiers namely support vector machine (SVM) and Naive Bayes (NB) classifiers using 10-fold cross validation. All the four trained classifiers are tested and the performance measures are estimated. Results CT slices of patients affected with pulmonary cancer and hamartoma are used for experimentation. From the lung parenchymal tissues of 300 CT slices, 390 nodules are extracted. The feature selection algorithms, ACO-CSM and ACO-RDM are run for different feature subset sizes. The selected features are used to train SVM and NB classifiers. From the results obtained, it is inferred that SVM classifier with the feature subsets chosen by ACO-RDM feature selection approach yielded a maximum classification accuracy of 94.36% with 38 features. Conclusion From the results, it can be clearly inferred that selecting relevant features to train the classifier has a definite impact on the performance of the classifier.

      PubDate: 2017-05-19T09:31:31Z
      DOI: 10.1016/j.aej.2017.04.014
       
  • Structural characterization and detecting processes of defects in leaded
           brass alloy used for gas valves production

    • Authors: Abdulsalam A. Fadhil; Magdy S. Ghattas; Berlanty A. Iskander; Sami A. Ajeel; Tawakol A. Enab
      Abstract: Publication date: Available online 17 May 2017
      Source:Alexandria Engineering Journal
      Author(s): Abdulsalam A. Fadhil, Magdy S. Ghattas, Berlanty A. Iskander, Sami A. Ajeel, Tawakol A. Enab
      The structure of leaded brass alloy used for gas valves production is studied. Some scientific knowledge and facts about this subject are introduced. The melting and casting of leaded brass billets, hot extrusion with cold drawing of rods and hot forging of gas valves are performed. Some changes in production parameters are performed and 30% of pure materials added to improve the final products and minimize the defects. The structure of alloy is studied using optical and SEM/EDS devices for inspections. Radiographic and ultrasonic tests are used to detect the cracks and other defects in final products. The results indicated that the structures, phase distribution and the quality of leaded brass alloys differ slightly during casting, extrusion and hot forging processes. Also, most of samples consist of α and β phases with lead particles distributed on the grain boundaries or inside these phases. Very small crack is appeared in one sample of the forged gas valve, while the other valves are free. Improving the production parameters and also using of pure materials in charge elements are contributed by result improvement. SEM/EDS investigation results confirm the microstructure results of optical microscope for sample element distribution.

      PubDate: 2017-05-19T09:31:31Z
      DOI: 10.1016/j.aej.2017.04.017
       
  • An exponential cubic B-spline algorithm for multi-dimensional
           convection-diffusion equations

    • Authors: H.S. Shukla; Mohammad Tamsir
      Abstract: Publication date: Available online 15 May 2017
      Source:Alexandria Engineering Journal
      Author(s): H.S. Shukla, Mohammad Tamsir
      We present a method viz. “exponential modified cubic B-spline differential quadrature method (Expo-MCB-DQM)” to approximate the numerical solution of 2D and 3D convection-diffusion equations (CDEs). This method is used to approximate the special derivatives whereas time derivative is approximated by using “an optimal five stages and fourth order Runge-Kutta (SSP-RK54)” scheme. Four examples are chosen to test out the efficiency and accuracy of the method. It is found that the present method turns out more accurate results compared to the results given by other methods. There is wide scope of the present method to be used for numerical solution of several PDEs governing physical, chemical and biological problems.

      PubDate: 2017-05-19T09:31:31Z
      DOI: 10.1016/j.aej.2017.04.011
       
  • Numerical treatment for traveling wave solutions of fractional
           Whitham-Broer-Kaup equations

    • Authors: Amjad Ali; Kamal Shah; Rahmat Ali Khan
      Abstract: Publication date: Available online 13 May 2017
      Source:Alexandria Engineering Journal
      Author(s): Amjad Ali, Kamal Shah, Rahmat Ali Khan
      In the concerned article, we present the numerical solution of nonlinear coupled system of Whitham-Broer-Kaup equations (WBK) of fractional order. With the help of Laplace transform coupled with Adomian decomposition method, an iterative procedure is established to investigate approximate solution to the proposed coupled system of nonlinear partial fractional differential equations. The concerned techniques are demonstrated by some numerical examples. Also, we compared the results of our proposed method with the results of other well known numerical methods such as Variation iteration method (VIM), Adomian decomposition method (ADM) and Homotopy perturbation method (HPM). For computation, we use Maple 18 and Matlab.

      PubDate: 2017-05-14T09:31:57Z
      DOI: 10.1016/j.aej.2017.04.012
       
  • An AC hybrid current limiting and interrupting device for low voltage
           systems

    • Authors: S. Hasan; El-S.M. El-Refaie; Ali H. Kasem Alaboudy; A.M. Hamada
      Abstract: Publication date: Available online 10 May 2017
      Source:Alexandria Engineering Journal
      Author(s): S. Hasan, El-S.M. El-Refaie, Ali H. Kasem Alaboudy, A.M. Hamada
      This paper addresses the development of the hybrid fault current limiter and interrupting device (HCLID) which can be used successfully as an ultra-fast short-circuit protection means for low voltage AC or DC industrial installations. The main components of the HCLID are as follows: a solid state commutation circuit that can supply a counter current injection from a stand-by pre-charged capacitor, a saturable core reactor as limiting impedance and a fast mechanical contact switch; all are connected in parallel. Through this study, a significantly improved and simplified approach that replaces the half-controllable SCR in the commutation circuit with self-turn-off device, such as IGCT, is presented. The use of high-performance semiconductors (IGCTs) as a commutating device affords reduced recovery voltage, reduced losses, improved reliability and dynamic performance, and fast switching time (in μs). The new approach is emulated in Piecewise Linear Electrical Circuit Simulation (PLECS) and involves a fault detection using rate of current rise rather than the current magnitude and a time delay operating characteristic. The proposed control method can be simply implemented. Different fault cases have been simulated in this paper. Simulation results proved the practicability and validity of the new HCLID.

      PubDate: 2017-05-14T09:31:57Z
      DOI: 10.1016/j.aej.2017.03.049
       
  • Assessment of a combination between hard structures and sand nourishment
           eastern of Damietta harbor using numerical modeling

    • Authors: A.M. Khalifa; M.R. Soliman; A.A. Yassin
      Abstract: Publication date: Available online 9 May 2017
      Source:Alexandria Engineering Journal
      Author(s): A.M. Khalifa, M.R. Soliman, A.A. Yassin
      Damietta harbor was constructed in 1982 as an inland harbor with its 15m depth navigation channel and two jetties acting like an obstacle to not allow sediment deposition in the harbor. On the other hand, they significantly affect the northern coast shoreline and hinder the sediment circulation in Damietta promontory. Satellite images show that new headlands are being implemented in the coastal shores of As-senaneyah. The proposed project consists of implementation of four headlands with length of 160m, spacing of 400m and using 150,000m3 nourishment in those spacing between the hard structures only once during the construction time. Litpack 1D-model is used to predict shoreline responses to number of different five scenarios considered as combination between hard structures such as headlands and sand nourishment. A total number of 32 profiles were used to assess the shoreline changes along Gamasa, Damietta and Ras El-bar resort from 2010 to 2015. This study prevails a high erosion rate of the eastern and western shorelines of the proposed headlands. Nourishment of 200,000m3/year is found to be a reasonable solution due to simplicity of being attained from Damietta harbor’s annual dredged materials which was reported to be average of 1millionm3/year.

      PubDate: 2017-05-14T09:31:57Z
      DOI: 10.1016/j.aej.2017.04.009
       
  • Punching shear behavior of recycled aggregate reinforced concrete slabs

    • Authors: Zaki I. Mahmoud; El tony M. El tony; Kawan S. Saeed
      Abstract: Publication date: Available online 9 May 2017
      Source:Alexandria Engineering Journal
      Author(s): Zaki I. Mahmoud, El tony M. El tony, Kawan S. Saeed
      Preservation of environment and natural resources has recently attracted researchers to study the use of recycled aggregates from demolished concrete in new concrete structures. This paper presents an experimental study on punching shear behavior of simply supported natural and recycled coarse aggregate concrete slabs. The punching shear behavior of interior slab–column connection in flat plates is tested in “The Reinforced Concrete Laboratory of the Faculty of Engineering, Alexandria University”. Eight two-way slab specimens using two different types of aggregate “natural and recycled” and two aggregate nominal sizes (12.5 and 25mm) were cast and tested to failure. The slabs were designed such that they would fail in punching shear only. The experimental work was conducted on (6) recycled coarse aggregate concrete (RCAC) slab specimens and (2) natural coarse aggregate concrete (NCAC) slabs. All the slabs were simply supported on four edges and tested under a central patch load. The ACI mix design procedure was adopted to achieve strength of concrete at 28days of 35MPa. Four concrete mix proportions were used with (0%, 30%, 60% and 100%) replacement of natural coarse aggregate with recycled coarse aggregate for each aggregate size. The test results showed that the first punch crack load, ultimate punch load, stiffness and energy absorption decrease as the replacement of natural coarse aggregate with recycled coarse aggregate increases. Also as the recycled aggregate size increases the cracking and failure load increases. The measured ultimate failure loads have been compared with code predictions (ECP 203, ACI 318, JSCE code, Euro code 2 and yield line theory). The Euro code – 2 equations gave the best correlation with the experimental results.

      PubDate: 2017-05-14T09:31:57Z
      DOI: 10.1016/j.aej.2015.12.004
       
  • Urban design in favor of human thermal comfort for hot arid climate using
           advanced simulation methods

    • Authors: Asmaa Barakat; Hany Ayad; Zeyad El-Sayed
      Abstract: Publication date: Available online 4 May 2017
      Source:Alexandria Engineering Journal
      Author(s): Asmaa Barakat, Hany Ayad, Zeyad El-Sayed
      Improving outdoor human thermal comfort could be considered as one of the most important targets for achieving successful open space designs. In hot arid climate, residential neighborhoods are responsible for the high request of energy to provide cooling needs for the occupants’ comfort. The main problem is the non-responsive contemporary urban design to human thermal comfort and energy. In this context, this paper aims at testing specific landscape parameters that could enhance outdoor human thermal comfort. The study is limited to the microclimate at urban open space and will be conducted in New Borg El-Arab (hot arid city according to Middleton and others [1], Alexandria, Egypt). The adopted methodology is based on the use of ENVI-met 4.0 software to measure four thermal indices (air temperature, relative humidity, MRT and PMV) and assess outdoor human thermal comfort in an existing neighborhood. In addition, different design scenarios that emphasize different landscape elements were also assessed. The results of this analysis depict changing street networks, landscape design and materials could enhance the level of thermal comfort in the urban open spaces.

      PubDate: 2017-05-09T08:06:35Z
      DOI: 10.1016/j.aej.2017.04.008
       
  • Nubian Vernacular architecture & contemporary Aswan
           buildings’ enhancement

    • Authors: Ola Ali Mahmoud Bayoumi
      Abstract: Publication date: Available online 3 May 2017
      Source:Alexandria Engineering Journal
      Author(s): Ola Ali Mahmoud Bayoumi
      The goal of the research was to investigate and analyze how Nubian building Environmental systems could be an inspiring way to develop and to rebuild the new city of Aswan and similar contemporary cities in hot arid regions. The paper also identifies the main economic, social and cultural consequences of using Nubian Vernacular systems for defining contemporary sustainable and restorative buildings and how these systems were ignored after Nubian displacement by the Government due to the high-dam project establishment. Moreover, it illuminates the most important techniques and methodologies of Nubian village planning and construction and how these ways could achieve maximum passive cooling, thermal comfort, least energy consumption and finally the sustainable development required in the 21st century.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2016.01.002
       
  • Dynamic multi-stage tandem queue modeling-based congestion adaptive
           routing for MANET

    • Authors: A. Amuthan; N. Sreenath; P. Boobalan; K. Muthuraj
      Abstract: Publication date: Available online 3 May 2017
      Source:Alexandria Engineering Journal
      Author(s): A. Amuthan, N. Sreenath, P. Boobalan, K. Muthuraj
      In Mobile Ad hoc Network (MANET), Congestion is considered as the significant issue of concern as they influence router based network functionalities achieved by the intermediate nodes participating in routing. Congestion generally occurs due to limited availability of network resources such as bandwidth and energy which lead to significant packet loss, end-to-end delay and communication overhead. Hence, the core objective of congestion control algorithms was to utilize the allocated network resources and to maintain the load below an acceptable threshold capacity. This paper proposes a Dynamic multi-stage Tandem Queue modeling-based Congestion Adaptive Routing (DTQCAR) based on the estimations of average threshold level of congestion. The decision of congestion policing is achieving the current congestion level and sending warning messages to all their neighbors for dynamic adjusting of packets forwarding. The estimation of average threshold level is based on Dynamic multi-stage Tandem Queue modeling that inspires stochastic probability. Depending on the elucidated stochastic factors, neighbors attempt to locate a congestion-free alternative path to the destination. The simulation results also confirm that DTQCAR on average showed a better performance of 13%, 17% and 19% than the existing LBCAR, DCDR and EDAPR congestion control algorithms in terms of packet delivery ratio.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.026
       
  • Flow of a second grade fluid with fractional derivatives due to a
           quadratic time dependent shear stress

    • Authors: Nauman Raza; M. Abdullah; Asma Rashid Butt; Aziz Ullah Awan; Ehsan Ul Haque
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Nauman Raza, M. Abdullah, Asma Rashid Butt, Aziz Ullah Awan, Ehsan Ul Haque
      The velocity field and shear stress for unsteady flow of a second grade fluid with fractional derivatives through an infinite long circular cylinder are evaluated. The fluid is initially at rest and at t = 0 + , the fluid inside the cylinder starts to move longitudinally due to tangential shear stress. Semi analytical solutions are obtained with the help of Laplace transformation and modified Bessel equation. This hybrid technique, which we have used has less computational efforts and time cost as compared to other schemes that are commonly used. The solutions in the transformed domain, are presented in terms of modified Bessel functions I 0 ( · ) and I 1 ( · ) and satisfy all given conditions. Inverse Laplace transformations have been numerically calculated by using MATLAB. The semi analytical solutions for the motion of second grade fluid with fractional derivatives are reduced to the similar solutions for ordinary second grade and Newtonian fluid. Finally, the effect of different parameters of the flow is graphically examined.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.04.004
       
  • Predicting the ingredients of self compacting concrete using artificial
           neural network

    • Authors: Mahmoud Abu Yaman; Metwally Abd Elaty; Mohamed Taman
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Mahmoud Abu Yaman, Metwally Abd Elaty, Mohamed Taman
      Self compacting concrete (SCC) is a highly flowable type of concrete that spreads into form without the need of mechanical vibration. This paper presents a comparative study between two methodologies which have been applied on two different data sets of SCC mixtures, which were gathered from the literature, using artificial neural network (ANN). The two methodologies aim to get the best prediction accuracy for the SCC ingredients using the 28-day compressive strength and slump flow diameters as inputs of the ANN. In the first methodology, the ANN model is constructed as a multi input – multi output neural network with the six ingredients as outputs. In the second methodology, the ANN model is constructed as a multi input – single output neural network where the six ingredient outputs are predicted separately from six different neural networks of multi input – single output type. Also, the influence of the mixes homogeneity on the prediction accuracy is investigated through the second data set. The results demonstrate the superiority of the second methodology in terms of accuracy of the predicted outputs. Moreover, the uniformity of the training data assures the accuracy of the predicted ingredients.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.04.007
       
  • Chaos synchronization and parameter identification of a finance chaotic
           system with unknown parameters, a linear feedback controller

    • Authors: Hamed Tirandaz; Saeid Saeidi Aminabadi; Hamidreza Tavakoli
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Hamed Tirandaz, Saeid Saeidi Aminabadi, Hamidreza Tavakoli
      In this research study, an adaptive linear feedback controller is presented for controlling the behavior of a financial chaotic system and identical/non-identical synchronization with unknown system parameters. An adaptive linear feedback controller is introduced based on the Lyapunov stability theorem, which is added to the nonlinear chaotic systems to achieve synchronization. Furthermore, the disparity amount of system parameters is estimated simultaneously. Identical and non-identical synchronizations are followed by some numerical simulations to verify the validity of the proposed method. The results show the effectiveness of the theoretical discussions.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.041
       
  • Comparative analysis of edge-based fractal image compression using nearest
           neighbor technique in various frequency domains

    • Authors: Richa Gupta; Deepti Mehrotra; Rajesh Kumar Tyagi
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Richa Gupta, Deepti Mehrotra, Rajesh Kumar Tyagi
      In this paper, edge based fractal image compression is proposed for various frequency domains. Range and domain blocks of similar edge property are mapped to lowest DCT coefficient in a vertical and horizontal direction into 2D coordinate System. The proposed algorithm is hybrid approaches which exercise fast Fourier transform (FFT), discrete cosine transform (DCT) and real DCT on edge based FIC. Range and domain block pool searching is proposed using k-nearest neighbor search method. Here dissimilarity or distance measure is used in K-NN search for domain and range block. Three frequency transform is used to compare the performance of edge based FIC for K-NN search strategies. The proposed algorithm focuses on image encoding time consumed in edge based FIC with minimal distortion in the resultant image. Proposed algorithm shows improvement in the quality of decoded image with same encoding time and compression ratio as compared to the existing algorithm. The quality of the decoded image was measured regarding PSNR.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.038
       
  • Fractional kinetic equations involving generalized k-Bessel function via
           Sumudu transform

    • Authors: P. Agarwal; S.K. Ntouyas; S. Jain; M. Chand; G. Singh
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): P. Agarwal, S.K. Ntouyas, S. Jain, M. Chand, G. Singh
      Principle aim of the present study is to develop fractional kinetic equations involving generalized k-Bessel function via Sumudu transform. Also, the graphical interpretation of the solutions by employing MATLAB is given.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.046
       
  • Impact of mode of application of magnetic field on rate of heat transfer
           of rarefied gas flows in a microtube

    • Authors: Basant K. Jha; Michael O. Oni
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Basant K. Jha, Michael O. Oni
      This paper examines theoretically the impact of transverse and radial mode of application of magnetic field on rate of heat transfer of rarefied gas in a micro tube. The momentum and energy governing equations are solved analytically with a uniform wall heat flux (H2 boundary conditions) applied on the heated perimeter of the cross section while the remaining arc length is assumed to be adiabatic. The velocity, temperature and Nusselt number are presented as a function of Knudsen number, azimuth angle and Hartmann number. During the course of numerical and graphical representations, results indicate that the role of magnetic field is to increase rate of heat transfer for both modes of application, while the impact of Knudsen number is to decrease rate of heat transfer for both cases. Furthermore, rate of heat transfer is higher in case of radial magnetic field in comparison with transverse magnetic field for both continuum flow and slip flow regimes.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.029
       
  • A study into the effect of loading conditions on the resistance of
           asymmetric high-speed catamaran based on experimental tests

    • Authors: A. Hajiabadi; R. Shafaghat; H. Kazemi Moghadam
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): A. Hajiabadi, R. Shafaghat, H. Kazemi Moghadam
      Preparing high speed and sea keeping simultaneously are outstanding features of Catamaran boats (as one of multi-hull boats). In this paper, influence of loading conditions on drag through 6 series of experimental tests has been investigated. Experiments have been executed in a towing tank for model in scale 1 ratio to 11.43. Ultimately, results have been presented to full scale boat by Froude number and ITTC model. Loading conditions consist primarily of both weight of boat and longitudinal central gravity (LCG). Hence, adopted Catamaran has been examined in various loading conditions (light, full and over load) and two LCGs allocated to each weight in order to clarify effect of ones on drag. According to results whatever central gravity comes close to transom (backward position of LCGs), drag diminishes in high speed but increase in boat weight leads to decrease in its impact. As a consequence, the most descent of drag about 9.6% occurred in light load and maximum speed.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.045
       
  • Two-mode Sharma-Tasso-Olver equation and two-mode fourth-order Burgers
           equation: Multiple kink solutions

    • Authors: Abdul-Majid Wazwaz
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Abdul-Majid Wazwaz
      We develop two new equations which describe propagation of two different wave modes simultaneously. The first equation is a two-mode Sharma-Tasso-Olver equation, and the second is a two-mode fourth-order Burgers equation. We show that multiple kink solutions for each model exist only for specific values of the nonlinearity and dispersion parameters included in the models. We will use the Cole-Hopf transformation combined with the simplified Hirota’s method to conduct this analysis.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.04.003
       
  • Performance of hybrid nanofluid (Cu-CuO/water) on MHD rotating transport
           in oscillating vertical channel inspired by Hall current and thermal
           radiation

    • Authors: Z. Iqbal; N.S. Akbar; Ehtsham Azhar; E.N. Maraj
      Abstract: Publication date: Available online 29 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Z. Iqbal, N.S. Akbar, Ehtsham Azhar, E.N. Maraj
      The present analysis examines the combined effects of Hall currents and thermal radiation on unsteady MHD hybrid nanofluid flow in a rotating vertical channel. Closed form solutions are obtained after simplification and suitable consideration. Cu and CuO nanoparticles are chosen for manufacturing of hybrid nanofluid. Analysis is carried out for three different stable shapes of nanoparticles. It is concluded that brick shaped nanoparticles contribute to relative low temperature distribution while platelets shaped nanoparticles are efficient in a sense of rising fluid flow. Moreover, primary velocity is a decreasing function of rotation parameter while secondary velocity is an increasing function of K 2 . Both velocities lessen with the rise in thermal radiation near the left wall while their magnitude rises near the right wall of the vertical channel.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.047
       
  • Analytical and experimental investigation on the flexural behavior of
           partially encased composite beams

    • Authors: Samer Ahmad; Adnan Masri; Zaher Abou Saleh
      Abstract: Publication date: Available online 28 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Samer Ahmad, Adnan Masri, Zaher Abou Saleh
      Composite members have become popular for medium and high rise buildings. This paper presents the results of an experimental and analytical investigation of the partially-encased composite steel beams with and without web openings. The constant parameters included in this study are the cross-sectional area of the specimen, the distribution of web openings in the encased steel beam, and the grade of concrete. The variable parameters included are percentage of steel section and the presence/non-presence of web openings of the encased steel beam. Six composite beams were tested with different steel percentages. The tests were conducted by applying concentrated load acting at mid-span of each composite beam. The experimental results of encased composite beams are compared and the mode failures are discussed. Based on the testing results it was found that, the specimens with web openings provided better performance as compared to that without web openings. Also the existence of web openings in the encased steel beams is effective in enhancing the flexural capacity and the energy absorption. This increases the ductility and hence reduces the weight of structure. A nonlinear finite element analysis is presented to evaluate the flexural behavior of composite beams. The test results are also compared with the finite element software. Good correlations between what was modeled and the actual experimental results have been achieved.

      PubDate: 2017-05-04T12:35:12Z
      DOI: 10.1016/j.aej.2017.03.035
       
  • Internal torsion resistance in deflected shafts

    • Authors: Mahmoud T. El-Sayed; Mohamed N.A. Nasr; B.M. El-Souhily; Mahmoud A. Moustafa
      Abstract: Publication date: Available online 26 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Mahmoud T. El-Sayed, Mohamed N.A. Nasr, B.M. El-Souhily, Mahmoud A. Moustafa
      Most of the shaft theories have based their analysis on bending moment, twisting moment or combined between them. Nevertheless, the dynamic behavior of flexural-torsional coupled vibrations in the rotating shafts is affected by the internal resistance forces due to torsion. It is expected that the deflected shafts shall be exposed to this resistance, where these forces were not considered in the analysis before. The objective of the present work was to estimate the effect of internal torsional resistance in shafts which is caused by deflection, for the reason that it has the upper hand on misalignment problem. With the aim of fulfilling this objective, an experimental rig has been constructed to verify the existence of the torsional resistance in deflected shafts and its variation with the rotation angle.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.02.001
       
  • Performance improvement of a hybrid air conditioning system using the
           indirect evaporative cooler with internal baffles as a pre-cooling unit

    • Authors: A.E. Kabeel; Mohamed Abdelgaied; Ravishankar Sathyamurthy; T. Arunkumar
      Abstract: Publication date: Available online 26 April 2017
      Source:Alexandria Engineering Journal
      Author(s): A.E. Kabeel, Mohamed Abdelgaied, Ravishankar Sathyamurthy, T. Arunkumar
      In the present paper, the effects of the indirect evaporative cooler with internal baffle on the performance of the hybrid air conditioning system are numerically investigated. The hybrid air conditioning system contains two indirect evaporative coolers with internal baffle, one is utilized to pre-cool the air inlet to the desiccant wheel and the other is utilized to pre-cool the supply air inlet to the room. The effects of the inlet conditions of the process and reactivation air and working air ratio on the thermal performance of the hybrid air conditioning system have been analyzed. The results of this study show that in the hybrid air conditioning system for using the indirect evaporative cooler with internal baffle as a pre-cooling unit, the supply air temperature reduced by 21% and the coefficient of performance improved by 71% as compared to previous designs of the hybrid air conditioning system at the same inlet conditions. For increasing process air inlet temperature from 25°C to 45°C, supply air temperature increases from 12.7°C to 14.2°C, thermal COP increases from 1.87 to 2.84, and supply air relative humidity increases from 76.7% to 77.4%. Also, for increasing the reactivation air inlet temperature from 70°C to 110°C, supply air temperature dropped from 15.9°C to 10.9°C, supply air relative humidity dropped from 82.7% to 71.8%, and thermal COP dropped from 4.5 to 1.7. The recommended optimal air working ratio in the indirect evaporative cooler with internal baffle should be 0.15.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.04.005
       
  • Numerical simulation of double-diffusive mixed convection in an enclosure
           filled with nanofluid using Bejan’s heatlines and masslines

    • Authors: Ali Akbar Abbasian Arani; Ahmad Ababaei; Ghanbar Ali Sheikhzadeh; Alireza Aghaei
      Abstract: Publication date: Available online 25 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Ali Akbar Abbasian Arani, Ahmad Ababaei, Ghanbar Ali Sheikhzadeh, Alireza Aghaei
      In this study, double-diffusive mixed convection of temperature-dependent alumina-water nanofluid in a lid-driven square enclosure is numerically investigated. The governing equations are discretized using finite volume method and solved by SIMPLER algorithm. The temperature and concentration of the left wall are higher than those of the right wall, while the two other walls are adiabatic and impermeable. The simulations are conducted for Richardson numbers of 0.01≤ Ri ≤100, buoyancy ratios of −5≤ Br ≤5, and nanoparticle volume fractions of 0≤ ϕ ≤4%. The results show that at high Richardson numbers, increasing the nanoparticle volume fraction results in a decrease in the average Nusselt number, while at low Richardson numbers this leads to an increase in the average Nusselt number. Additionally, by comparing the Nusselt or Sherwood numbers for positive and negative values of a same buoyancy ratio, the positive values always lead to higher average Nusselt or Sherwood number. Moreover, the heatlines are more compressed for nanofluid than pure fluid, which demonstrates better convective heat transfer by nanofluid than pure fluid. Masslines are always similar to streamlines due to domination of mass transfer on fluid flow at high Lewis numbers.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.034
       
  • Prediction of the true harmonic current contribution of nonlinear loads
           using NARX neural network

    • Authors: A.Y. Hatata; M. Eladawy
      Abstract: Publication date: Available online 25 April 2017
      Source:Alexandria Engineering Journal
      Author(s): A.Y. Hatata, M. Eladawy
      This paper presents a method to predict the load current harmonics injected into micro grid power systems using Nonlinear Auto Regressive neural networks with eXogenous input (NARX neural network). The proposed NARX network will be used to model the nonlinearity of electric loads. The network will be trained using data obtained from field measurements. After training the proposed network, it will be injected with pure sinusoidal voltage waveform to identify and isolate the current harmonics caused by nonlinear loads. The measurements of the nonlinear load are taken from Khalda – Main Razzak (MRZK) power station 1.2MW capacity. The station consists of four Distributed Generators (DG) supply various linear and nonlinear loads, so it can be considered as an isolated micro grid. The nonlinear load under test is an Electrical Submersible Pump (ESP) which is driven by induction motor and controlled by Variable Speed Drive (VSD). The proposed method has proven a good performance for ESP current harmonic prediction and thus justifies accuracy and reliability.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.050
       
  • Nonlinear convection in nano Maxwell fluid with nonlinear thermal
           radiation: A three-dimensional study

    • Authors: B. Mahanthesh; B.J. Gireesha; G.T. Thammanna; S.A. Shehzad; F.M. Abbasi; R.S.R. Gorla
      Abstract: Publication date: Available online 22 April 2017
      Source:Alexandria Engineering Journal
      Author(s): B. Mahanthesh, B.J. Gireesha, G.T. Thammanna, S.A. Shehzad, F.M. Abbasi, R.S.R. Gorla
      The combined effects of nonlinear thermal convection and radiation in 3D boundary layer flow of non-Newtonian nanofluid are scrutinized numerically. The flow is induced by the stretching of a flat plate in two lateral directions. The mechanism of heat and mass transport under thermophoretic and Brownian motion is elaborated via implementation of the thermal convective condition. The prevailing two-point nonlinear boundary value problem is reduced to a two-point ordinary differential problem by employing suitable similarity transformations. The solutions are computed by the implementation of homotopic scheme. At the end, a comprehensive parametric study has been conducted to analyze the typical trend of the solutions. It is found that the nanoparticle volume fraction and temperature profiles are stronger for the case of solar radiation in comparison with problem without radiation.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.037
       
  • A modified segmentation method for determination of IV vessel boundaries

    • Authors: Mazhar B. Tayel; M.A. Massoud; Y. Farouk
      Abstract: Publication date: Available online 22 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Mazhar B. Tayel, M.A. Massoud, Y. Farouk
      Coronary heart diseases are ranked as the top diseases causing death in many countries worldwide. Intravascular Ultrasound (IVUS) directly images the vessel from inside and allows the extraction of vessel bounders and the measurement of vessel cross-sectional area. This paper introduces an approach for detection of lumen and media-adventitia borders in an Intravascular (IV) image. In the proposed method, a modified fast algorithm is applied to determine the lumen and media-adventitia contours. The modified fast algorithm is fully tested and it showed an improvement in speed of up to 200% while preserving an accuracy rate of 98%.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.04.002
       
  • Numerical study of nanofluid natural convection in a square cavity with a
           hot obstacle using lattice Boltzmann method

    • Authors: A.R. Rahmati; A.A. Tahery
      Abstract: Publication date: Available online 21 April 2017
      Source:Alexandria Engineering Journal
      Author(s): A.R. Rahmati, A.A. Tahery
      In the present work, for the first time, laminar natural convection of water-TiO2 nanofluid around a hot obstacle in a square cavity is simulated by Lattice Boltzmann Method (LBM). The effect of Rayleigh number, obstacle dimension, volume fraction of nanofluid, cavity dimensions, surface ratio and various models for computing of thermal conductivity coefficient and viscosity coefficient on Nusselt number and heat transfer around hot obstacle in enclosure has been investigated. The results show that by increase in Rayleigh number and volume fraction, average Nusselt number will increase. The average Nusselt number will increase when obstacle dimensions increase to 0.5L but it will decrease when the obstacle dimensions increase to 0.7L. Vortexes will create in 0.8L and it causes to increase heat transfer. By reduplicating the obstacle width, heat transfer is better than reduplicating the obstacle length. The average Nusselt number increases by increase in cavity length and it will decrease by increase in cavity wide. All results are equal in Hamilton-Crosser and Maxwell-Garnett model when the surface ratio is one. But heat transfer will increase by decreasing surface ratio. The average Nusselt number in Wang model is less than Nusselt number in Brinkman model.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.030
       
  • Numerical investigation of nanofluid melting heat transfer between two
           pipes

    • Authors: M. Sheikholeslami; Davood Domiri Ganji
      Abstract: Publication date: Available online 21 April 2017
      Source:Alexandria Engineering Journal
      Author(s): M. Sheikholeslami, Davood Domiri Ganji
      CuO-water nanofluid melting heat transfer between two circular cylinders is studied in existence of horizontal magnetic field. Effect of various shapes of nanoparticles on nanofluid properties is considered. The KKL model is utilized for estimating viscosity of nanofluid. Runge-Kutta integration scheme is selected for solving ODEs. Numerical procedures are examined for various active parameters namely shapes of nanoparticle, melting parameter (δ), Hartmann number (Ha), Eckert number (Ec) and Reynolds number (Re). Results show that temperature gradient increases with increase in Hartmann number but it decreases with increase in melting parameter. Velocity reduces with rise of Lorentz forces and melting parameter but it increases with increase in Reynolds number.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.028
       
  • Influence of shape factor on flow of magneto-nanofluid squeezed between
           parallel disks

    • Authors: Naveed Ahmed; Adnan; Umar Khan; Syed Tauseef Mohyud-Din
      Abstract: Publication date: Available online 20 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Naveed Ahmed, Adnan, Umar Khan, Syed Tauseef Mohyud-Din
      This manuscript deals with time dependent squeezed flow of magneto-nanofluid between two parallel disks. The effects of viscous dissipation are also taken into consideration. Base is suspended with nanoparticles of various shapes. Three different shaped nanoparticles are suspended in the base fluid. Hamilton and Crosser’s model for effective thermal conductivity of the nanofluid has been considered for the analysis. For dynamic viscosity, Brinkman model is used. The suitable similarity transforms are used to transform the equations governing the flow into a set of ordinary differential equations. Three techniques are used to solve the resulting system, namely Adomian’s decomposition method (ADM), Variation of parameters method (VPM) and Runge-Kutta numerical method. The comparison between solutions has been made and found an excellent agreement. The influence of varying flow parameters on velocity and temperature fields is also portrayed graphically. The numerical values for skin fraction and local heat transfer are calculated for emerging parameters. Furthermore, the values for some constants appeared in the analytical solutions are also found for different parameters.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.031
       
  • Three dimensional MHD upper-convected Maxwell nanofluid flow with
           nonlinear radiative heat flux

    • Authors: M. Bilal; M. Sagheer; S. Hussain
      Abstract: Publication date: Available online 20 April 2017
      Source:Alexandria Engineering Journal
      Author(s): M. Bilal, M. Sagheer, S. Hussain
      In the present article, three dimensional upper-convected Maxwell (UCM) nanofluid flow over a stretching surface has been considered to examine the effects of nanoparticles and magnetohydrodynamics (MHD) on heat and mass transfer. A nonlinear radiative heat flux is incorporated in the formulation of energy equation. Similarity transformation reduces the nonlinear partial differential equations of the problem to the ordinary differential equations, which are then solved by the well known shooting technique through Runge-Kutta integration procedure of order four. To strengthen the reliability of our results, the MATLAB built-in function bvp4c is also used. Effects of some prominent parameters such as Brownian motion parameter, Prandtl number, thermophoresis parameter, magnetic parameter on velocity, temperature and concentration are discussed graphically and numerically. It is witnessed that flow velocity is diminishing function of linear and nonlinear thermal radiation parameter. Moreover mounting values of Brownian motion parameter lower the nanoparticle concentration profile.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.039
       
  • A combined scheme of video packet transmission to improve cross layer to
           support QoS for MANET

    • Authors: Asha; G. Mahadevan
      Abstract: Publication date: Available online 20 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Asha, G. Mahadevan
      Due to rapid growth in wireless communication, multimedia communication over wireless network attracted researchers. In this field of multimedia communication mobile Ad Hoc Network (MANET) has proved its significance. MANETs are collection of various communicating nodes without utilizing any fixed infrastructure and network topology. In MANET, mobile nodes can independently be in any direction which causes frequent change in network configuration. Use of multimedia communication is increasing day-by-day which demands high Quality-of-Service for end user experience. MANET suffers from challenges to provide QoS such as dynamic nature of mobile node, limited bandwidth, routing, and contention channel. In this work, we address the issue QoS in mobile ad hoc network for multimedia applications. In order to improve the quality of service for mobile-ad hoc network, this article presents a combined scheme to maximize the network performance. Proposed approach includes three main aspects such as channel modeling, threshold based data transmission and queuing modeling over physical layer to support quality of service. Channel modeling provides the information about channel such as path loss, Probability density function of channel fading, path gain and probability density function of gain. Later, threshold selection model is implemented to compute the threshold of video packet. With the help of threshold, channel is selected through which video packet has to be transmitted and finally queuing model is developed to reduce communication delay in mobile ad hoc network. Performance of proposed model is computed in terms of throughput, bandwidth efficiency and packet delivery rate and compared with existing approach. Experimental study shows that proposed model is able to perform better when compared to existing approach.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.033
       
  • Multiband SRR loaded Koch star fractal antenna

    • Authors: C. Elavarasi; T. Shanmuganantham
      Abstract: Publication date: Available online 20 April 2017
      Source:Alexandria Engineering Journal
      Author(s): C. Elavarasi, T. Shanmuganantham
      The Split ring resonator [SRR] loaded Koch star fractal antenna for multiple Freq band apps is presented. The CPW-Fed ant consists of Circular Split Ring Resonator [CSRR] which is fixed on reverse side of the substrate and iterated Koch star which is stamped on top of the FR4. The Koch fractal SRR antenna with a compacted size of 12×14mm2 is fabricated and tested. The multiple Freq for antenna measured capitulate with a −10dB at 1.88/6.54/7.88/12.20/15.08GHz bands and cover up the Freq spectrum of GSM, WiMAX, IEEE 802.11a (WLAN)/b/g, IEEE 802.16e, ITU, S/C/X/Ku and K band, correspondingly. The extraction method of −ve permeability for the projected circular slit resonator is examined in detail. The antenna projected to have significant recompense, plus low profile, miniaturization capability with good S11 and VSWR is accepting for the functional frequency bands.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.04.001
       
  • A metamodel-based multicriteria shape optimization process for an aerosol
           can

    • Authors: Aalae Benki; Abderrahmane Habbal; Gael Mathis
      Abstract: Publication date: Available online 20 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Aalae Benki, Abderrahmane Habbal, Gael Mathis
      In this paper, we study a multicriteria shape design of a highly nonlinear mechanical 2D structure, namely the shape optimization of the aerosol can bottom. In fact, it is made depending on two criteria, the dome growth DG and the dome reversal pressure DRP, that define the resistance of the bottom against the internal pressure. This two criteria are known to be conflicting; therefore, a multicriteria optimization problem is formulated to represent the trade-offs among the design parameters. Due to the expensive time-consuming cost to solve this kind of optimization problems (e.g., capturing the Pareto front), the use of a surrogate model (e.g., metamodel) cheap to evaluate is mandatory. For this reason, we have developed an algorithm which is a coupling between the normalized normal constraint method (NNCM) and the radial basis function metamodel (RBF). The NNCM-RBF coupling was tested for several academic test cases and for our industrial problem and the obtained results clearly show the efficiency of our coupling to solve all the problems treated with a remarkable gain in the computational time.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.036
       
  • Thermal-hydraulic analysis of VVER-1000 residual heat removal system using
           RELAP5 code, an evaluation at the boundary of reactor repair mode

    • Authors: Z. Tabadar; M. Jabbari; M. Khaleghi; M. Hashemi-Tilehnoee
      Abstract: Publication date: Available online 19 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Z. Tabadar, M. Jabbari, M. Khaleghi, M. Hashemi-Tilehnoee
      Removing the residual heat from a nuclear reactor is an important safety aspect of thermal hydraulic analysis. In this study, a typical VVER-1000 reactor residual heat removal system has been evaluated using RELAP5 thermal hydraulic loop code during cool-down. Reactor cooling down starts from hot state temperature and then continues to the cool-down stages with 130°C and 70°C, respectively. The second stage of cooling down is the boundary of the reactor repair condition. Main cooling pump head, steam generator (SG) water level, system pressure, the level of coolant in the pressurizer (PRZ), and the temperature of fuel element are examined in a steady state condition. PRZ level, primary circuit and secondary circuit pressure/temperature, and SG water level are evaluated during 32,000s after cool-down scenario. By comparison, it concluded that the results of RELAP5 code are in agreement with plant experimental data and final safety analysis report (FSAR). Thus, it is proved that the studied reactor is capable to remove the residual heat generated during shutdown. Moreover, RELAP5 is properly recommended for analysis of the VVER-1000 pressurized water reactor during cool-down.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.044
       
  • Liquid-infiltrated photonic crystal fiber for sensing purpose: Design and
           analysis

    • Authors: Md. Shadidul Islam; Bikash Kumar Paul; Kawsar Ahmed; Sayed Asaduzzaman; Md. Ibadul Islam; Sawrab Chowdhury; Shuvo Sen; Ali Newaz Bahar
      Abstract: Publication date: Available online 4 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Md. Shadidul Islam, Bikash Kumar Paul, Kawsar Ahmed, Sayed Asaduzzaman, Md. Ibadul Islam, Sawrab Chowdhury, Shuvo Sen, Ali Newaz Bahar
      In this paper, a highly sensible photonic crystal fiber based on a modified hexagonal structure has mentioned and demonstrated modal analysis precisely. Numerical investigation of the proposed fiber is rigorously computed using full vector finite element method (FV-FEM) with anisotropic perfect match layers. Liquid analytes are used here to infiltrate fiber core. Relative sensitivity is numerically investigated and optimized by varying the different parameters of the proposed structure at a wider wavelength regime 1.0–1.7μm within IR region. The proposed simple structural PCF shows higher sensitivity as a chemical sensor for lower refractive index chemicals such as Water, Ethanol and Benzene. Moreover, some essential properties such as confinement loss, V parameter, spot size, beam divergence, and nonlinearity are also represented distinctly. The proposed PCF gains higher sensitivity of 53.22%, 48.19% and 55.56% for Ethanol, Water and Benzene respectively at 1.33μm wavelength with lower confinement loss. Above result reveals that proposed fiber is capable to provide potential impact in telecommunications, chemical sensing as well as bio-sensing also.

      PubDate: 2017-04-27T18:30:37Z
      DOI: 10.1016/j.aej.2017.03.015
       
  • Reduction of source current harmonics in ANN controlled induction motor

    • Authors: A. Sivakumar; N.B. Muthu Selvan
      Abstract: Publication date: Available online 19 April 2017
      Source:Alexandria Engineering Journal
      Author(s): A. Sivakumar, N.B. Muthu Selvan
      Harmonics generated by the nonlinear loads is a serious concern to the power system engineers as it adversely affects the power quality of the system. Recently, many findings focus on reducing the harmonics by introducing various topologies of the filter at the load end. This paper introduces a new concept of reducing current harmonics at the source side of induction motor using SAF in ANN controller. The vector control approach has been adopted for improving the dynamic performance of three phase induction motors. The voltage source inverter fed induction motor is considered as a nonlinear load. The mathematical model of three phase induction motor has been developed and the source current harmonics is reduced using PI and ANN controller. The hardware implementation of induction motor drive with shunt active filter on the supply side has been done. Also, the model is simulated using MATLAB/Simulink software and validated with the hardware results.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.048
       
  • A novel hybrid intelligent system with missing value imputation for
           diabetes diagnosis

    • Authors: Rohollah Ramezani; Mansoureh Maadi; Seyedeh Malihe Khatami
      Abstract: Publication date: Available online 19 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Rohollah Ramezani, Mansoureh Maadi, Seyedeh Malihe Khatami
      Recently, diabetes becomes the widespread and major disease in the world. In this paper, we propose a novel hybrid classifier for diabetic diseases. The proposed hybrid classifier named Logistic Adaptive Network-based Fuzzy Inference System (LANFIS) is a combination of Logistic regression and Adaptive Network-based Fuzzy Inference System. Our proposed intelligent system does not use classifiers to continuous output, does not delete samples with missing values, and does not use insignificant attributes which reduces number of tests required during data acquisition. The diagnosis performance of the LANFIS intelligent system is calculated using sensitivity, specificity, accuracy and confusion matrix. Our findings show that the classification accuracy of LANFIS intelligent system is about 88.05%. Indeed, 3–5% increase in accuracy is obtained by the proposed intelligent system and it is better than fuzzy classifiers in the available literature by deleting all samples to missing values and applying traditional classifiers to different sets of features.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.043
       
  • Renewable energy technologies for sustainable development of energy
           efficient building

    • Authors: Arvind Chel; Geetanjali Kaushik
      Abstract: Publication date: Available online 19 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Arvind Chel, Geetanjali Kaushik
      The energy conservation through energy efficiency in the building has acquired prime importance all over the world. The four main aspects for energy efficiency in a building include first and foremost the nearly zero energy passive building design before actual construction, secondly the usage of low energy building materials during its construction, thirdly use of energy efficient equipments for low operational energy requirement and lastly integration of renewable energy technologies for various applications. These aspects have been discussed along with their economics and environmental impacts briefly in this paper. The first aspect is related to the prior design before construction of a solar passive building techniques adapted all over the world not only for passive heating/cooling but also for daylighting the building. Second is utilizing the low embodied energy building materials for building construction. The third aspect deals with the operational energy conservation using energy efficient equipments in the building. Lastly, the building has to include utility of integrated renewable systems for hot water heating, solar photovoltaic electrification, etc.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.02.027
       
  • Enhanced impact properties of cementitious composites reinforced with
           pultruded flax/polymeric matrix fabric

    • Authors: Magdi El-Messiry; Shaimaa El-Tarfawy; Rania El Deeb
      Abstract: Publication date: Available online 18 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Magdi El-Messiry, Shaimaa El-Tarfawy, Rania El Deeb
      Fiber reinforced concrete (FRC) has become increasingly applied in civil engineering in the last decades. Natural fiber fabric reinforced cement composites are considered to prevent damage resulting from an impact loading on the cementite plate. Flax woven fabric that has a high energy absorption capability was chosen. To increase the interfacial shear properties, the fabric was pultruded with different matrix properties that affect the strength and toughness of the pultruded fabric. In this study, three fabric structures are used to increase the anchoring of the cement in the fabric. The compressive strength and the impact energy were measured. The results revealed that pultruded fabric reinforced cement composite (PFRC) absorbs much more impact energy. PFRC under impact loading has more micro cracks, while plain cement specimen shows brittle failure. The compressive test results of PFRC indicate that flax fiber fabric polymer enhanced compressive strength remarkably. Fiber reinforcement is a very effective in improving the impact resistance of PFRC. The study defines the influence factors that control the energy dissipation of the composite, which are the hardness of the polymer and the fabric cover factor. Significant correlation between impact energy and compressive strength was proved.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.032
       
  • Implementation of artificial neural network based controller for a
           five-level converter based UPQC

    • Authors: Sudheer Vinnakoti; Venkata Reddy Kota
      Abstract: Publication date: Available online 18 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Sudheer Vinnakoti, Venkata Reddy Kota
      To reduce the cost and complexity of the system, ANN controller is proposed for a five-level converter based UPQC which eliminates mathematical operations such as a-b-c to d-q-0 transformation and complex controllers such as DSP’s and FPGA’s,. This paper proposes a five-level DCC based UPQC with ANN based controller and its performance is tested with nonlinear unbalanced loads and harmonic supply voltage. In addition, voltage related issues such as sag and swell are also considered. ANN control scheme trained with Levenberg-Marquardt backpropagation algorithm is used in this paper for effective generation of reference signals and also for maintaining desired dc link capacitor voltage. Simulations are carried out in Matlab/Simulink software with two-level UPQC, and three-level and five-level diode clamped converter based UPQC using SRF based control and ANN control schemes. The results showed better performance with the proposed concept and are discussed in this paper. The response of dc link capacitor voltage with two-level, three-level and five-level converter based UPQC and its effect on supply currents are discussed. Comparison of %THD in load voltage and supply current with two-level, three-level and five-level converter based UPQC using SRF based control and ANN control schemes is presented to show the superiority of the proposed controller.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.027
       
  • Calophyllum inophyllum methyl ester biodiesel blend as an alternate fuel
           for diesel engine applications

    • Authors: B. Ashok; K. Nanthagopal; D. Sakthi Vignesh
      Abstract: Publication date: Available online 18 April 2017
      Source:Alexandria Engineering Journal
      Author(s): B. Ashok, K. Nanthagopal, D. Sakthi Vignesh
      Calophyllum inophyllum oil is non-edible in nature could be used as a source for biodiesel esterification in India and it is also available in abundant quantities in places such as Southern east and East Asia and Australia. The present research work examines the suitability of Calophyllum inophyllum as promising feedstock for biodiesel production and its employability in diesel engine operation. The Calophyllum trees are found in abundance in India and can reduce the dependency of petroleum imports to a certain extent. The biodiesel Calophyllum inophyllum Methyl Ester (CIME100) and its blends CIME30 and CIME60 are used in engine testing. The experimental parameters such as brake thermal efficiency, brake specific energy consumption, unburned hydrocarbon, carbon monoxide, and NOx emissions are evaluated with CIME100 biodiesel and the results are compared with conventional fuel. It is observed that the CIME biodiesel resulted in slight decrease in brake thermal efficiency. The hydrocarbon and carbon monoxide emissions are reduced with the use of biodiesel with significant penalty in oxides of nitrogen emissions. In addition, the combustion parameters such as cylinder gas pressure, ignition delay period, and heat release rate of CIME100 are discussed in detailed and compared to conventional diesel fuel under various loading conditions.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.042
       
  • A computational modelling of micro strip patch antenna and its solution by
           RDTM

    • Authors: R.K. Chaurasia; Vishal Mathur; R.L. Pareekh; Mohammad Tamsir; Vineet K. Srivastava
      Abstract: Publication date: Available online 17 April 2017
      Source:Alexandria Engineering Journal
      Author(s): R.K. Chaurasia, Vishal Mathur, R.L. Pareekh, Mohammad Tamsir, Vineet K. Srivastava
      This paper concerns with the modelling of a micro strip antenna with strip line feeding technique formulated using Ohm’s law. A partial differential equation is obtained from the model which is solved using “Reduced Differential Transformation Method (RDTM)”. A couple of numerical examples are considered to check the accuracy, efficiency and convergence of the method. The present method is a very powerful mathematical tool for solving wide range of problems arising in circuit theory, RF field, and science and communication system fields.

      PubDate: 2017-04-19T23:01:26Z
      DOI: 10.1016/j.aej.2017.03.040
       
  • The space-splitting idea combined with local radial basis function
           meshless approach to simulate conservation laws equations

    • Authors: Mehdi Dehghan; Mostafa Abbaszadeh
      Abstract: Publication date: Available online 10 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Mehdi Dehghan, Mostafa Abbaszadeh
      One acceptable technique in meshfree methods is collocation procedure based on the radial basis functions. But the mentioned technique is poor for solving problems that have shock (advection problems). The use of local collocation radial basis function method overcomes this important issue. The interpolation matrix of local radial basis functions is well-posed. Also, it is better, for obtaining high-order accurate results, we consider many points in the domain; thus, the size of coefficient matrix will be large. We suggest a robust technique to deal with this matter. In the current paper, we combine the local collocation radial basis functions method with the space-splitting technique. Solving some one-dimensional problems instead of a two-dimensional problem is an important advantage of the presented combination. For showing the efficiency of new method, we solve some conservation laws equations. An important benefit of the meshless methods is applying them on irregular domains; thus, we provided a test problem that has been solved on two irregular geometries. We use the local RBF collocation method to discrete the spatial domain and then we obtain a nonlinear system of ODEs that it will be solved using the fourth-order exponential time differencing Runge–Kutta method. Moreover, several examples are given that show the acceptable accuracy and proficiency of the present scheme.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2017.02.024
       
  • Secure server-server communication for dual stage biometrics – based
           password authentication scheme

    • Authors: Mythili Boopathi; M. Aramudhan
      Abstract: Publication date: Available online 10 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Mythili Boopathi, M. Aramudhan
      The distributed environment insists the protection of servers, while information sharing is achieved. The conventional biometrics-based password authentication mechanisms use single server, which can be compromised easily. The dual stage authentication mechanism has been already proved for its security over the single stage authentication mechanism in our previous work. In this paper, the protocol is improved to establish communication between the authentication server and the master server through a secure link. Since the hashed messages are prone to collision attacks, the proposed scheme uses elliptic curve cryptography-based ciphers for establishing connection at the initial stage. The security analysis of the proposed authentication scheme with secure server – server communication link reveals the robustness and the security features, which are offered over our previous as well as the conventional authentication mechanisms.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2017.01.031
       
  • Dynamic operation rules of multi-purpose reservoir for better flood
           management

    • Authors: Ahmed Moustafa Ahmed Moussa
      Abstract: Publication date: Available online 10 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Ahmed Moustafa Ahmed Moussa
      This research was commenced to enhance flood management via improving the operation rules of multi-purpose reservoirs (i.e. Aswan High Dam Reservoir “AHDR”). Literature in the field of reservoir operation rules was reviewed. Available data, about Aswan High Dam (AHD) together with its reservoir releases, were assembled and analyzed. Accessible numerical models were investigated to select the applicable model in terms of the assembled available data. Tenth scenarios (the current scenario and 9 proposed scenarios) for AHDR operation rules were designed and simulated. These scenarios include climate change, static operation (fixed level at beginning of water year from the 1st of August) and dynamic operation. Results were obtained and compared to the existing operation rules. The comparison considered the storage, water release, hydropower generation and total losses. In addition, the comparison considered the dam safety. The comparison indicated that the dynamic operation rules would achieve satisfying results; this scenario will provided an increase in the yearly AHDR storage from 3% to 4% during 9years. The total increase in the storage was 22.46 BCM during 9years without any reduction in the release downstream AHD and the hydropower generation. This increase in storage can be used for Toshka project.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2017.03.012
       
  • Palm fibers and modified palm fibers adsorbents for different oils

    • Authors: Ola Abdelwahab; Samir M. Nasr; Walaa M. Thabet
      Abstract: Publication date: Available online 9 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Ola Abdelwahab, Samir M. Nasr, Walaa M. Thabet
      The cleanup of oil spill using natural adsorbents is considered as an eco-friendly and cost-effective way, emphasizing the importance of such natural and effective promising technique. Palm fibers, PFs, were used as natural sorbent material for oil spill removal. The present study examines the sorption efficiency and capacity of raw and modified fibers for three types of oil: diesel oil, crude oil and vegetable oil. The results revealed that the efficiency of fibers to remove different types of oil from artificial saline water was related to sorption time and the system conditions such as oil film thickness, particle size, sorbent dosage and temperature. The results showed high sorption efficiency and capacity of palm fibers for different kinds of oil. PFs were very proved to be promising fibers because of all advantages of agricultural wastes plus the high resistance of that fibers which appeared obviously in the present study.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2016.11.020
       
  • Inelastic performance of RC buildings subjected to near-source
           multi-component earthquakes

    • Authors: Laila Elhifnawy; Hamdy Abou-Elfath; Emad El-Hout
      Abstract: Publication date: Available online 8 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Laila Elhifnawy, Hamdy Abou-Elfath, Emad El-Hout
      The inelastic behavioral characteristics of three RC buildings having 6-, 10- and 20-stories under near-source multi-component earthquake excitations are investigated. Ten earthquake records are used in the analysis to cover a wide range of vertical to horizontal spectral ratios. The performances of the buildings are evaluated through the roof displacements, the maximum story drift ratios and the maximum axial forces and strain ductility factors in the building members. Four analysis cases are considered for each earthquake including, one lateral earthquake component (X-case), two lateral earthquake components (XY-case), one lateral earthquake component accompanied with the vertical earthquake component (XZ-case) and two lateral earthquake components accompanied with the vertical earthquake component (XYZ-case). The results obtained in this study indicate that the multi-component effect of the earthquakes has a considerable effect on the axial forces and strain ductility factors of the building columns although it does not significantly affect the building lateral-deformation response.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2017.03.023
       
  • Computational modeling of magnetohydrodynamic non-Newtonian fluid flow
           past a paraboloid of revolution

    • Authors: G. Kumaran; N. Sandeep; I.L. Animasaun
      Abstract: Publication date: Available online 7 April 2017
      Source:Alexandria Engineering Journal
      Author(s): G. Kumaran, N. Sandeep, I.L. Animasaun
      Flow and heat transfer behavior of magnetohydrodynamic Carreau and Casson fluids past an upper part of the paraboloid of revolution with space dependent internal heat source/sink is investigated theoretically. The buoyancy induced on the flow is considered in such way that the surface is neither vertical/horizontal nor wedge/cone. The equations that govern the flow are transformed using suitable similarity variables and solved numerically by employing R-K-F integration scheme. Graphical results are obtained to discuss the behavior of flow and temperature fields for various parameters of interest. Also the wall friction is computed and heat transfer coefficient is reduced. It is found that the boundary layers of temperature and velocity distributions are non-uniform for Carreau and Casson flows. Impact of drag force is high on Casson flow when equated with Carreau fluid.

      PubDate: 2017-04-12T18:31:36Z
      DOI: 10.1016/j.aej.2017.03.019
       
  • Electromagnetic & thermal analysis of synchronous generator with
           different rotor structures for aircraft application

    • Authors: Deepak Arumugam; Premalatha Logamani; Santha Karuppiah
      Abstract: Publication date: Available online 3 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Deepak Arumugam, Premalatha Logamani, Santha Karuppiah
      Alternator delivers power to a system which has high speed operations such as aircraft, marine industry, and automobile industries. So, it is necessary to evaluate the performance of this alternator during high speed operations. Finite Element Analysis (FEA) is an effective tool to analyze the performance of electrical machines with certain boundary conditions. In this paper, the FEA analysis of the 5KW alternator with two different rotor structures for high speed operation is presented. The transient electromagnetic FEA has been carried out which forms the basis for thermal modeling and thermal analysis of the alternator. Finally the overall electromagnetic and thermal performance of a prototype alternator with different rotors is compared experimentally.

      PubDate: 2017-04-05T08:04:15Z
      DOI: 10.1016/j.aej.2017.03.020
       
  • Novel realization of GIC based wave digital filters using Al-Alaoui
           transform

    • Authors: Richa Barsainya; Tarun Kumar Rawat
      Abstract: Publication date: Available online 1 April 2017
      Source:Alexandria Engineering Journal
      Author(s): Richa Barsainya, Tarun Kumar Rawat
      By using the concepts of wave characterization, Al-Alaoui transform and generalized immittance converter (GIC), a new digital GIC structure is proposed which is capable of realizing all the standard second-order digital filter sections. The Al-Alaoui transform is utilized for reference circuit discretization, leading to development of second-order digital filter sections which possess better noise properties than the conventional GIC and GIC discretized using the fractional bilinear transform. The proposed second-order digital filter sections are used as building blocks in cascade synthesis of filter. Two design examples are considered to analyze the effectiveness of the proposed filter sections and their comparison with the other filter sections is performed in terms of quantization noise and approximation to analog filter response. The proposed synthesis yields lowpass and highpass filters that have a better signal to noise ratio and better approximation of the analog filter frequency response than the conventional GIC digital filters and fractional GIC digital filters.

      PubDate: 2017-04-05T08:04:15Z
      DOI: 10.1016/j.aej.2017.03.010
       
 
 
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