for Journals by Title or ISSN
for Articles by Keywords

Publisher: Elsevier   (Total: 3043 journals)

 A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z  

        1 2 3 4 5 6 7 8 | Last   [Sort by number of followers]   [Restore default list]

Showing 1 - 200 of 3043 Journals sorted alphabetically
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 22, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 21, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 84, SJR: 1.109, h-index: 94)
Accounting Forum     Hybrid Journal   (Followers: 25, SJR: 0.612, h-index: 27)
Accounting, Organizations and Society     Hybrid Journal   (Followers: 30, SJR: 2.515, h-index: 90)
Achievements in the Life Sciences     Open Access   (Followers: 4)
Acta Anaesthesiologica Taiwanica     Open Access   (Followers: 5, SJR: 0.338, h-index: 19)
Acta Astronautica     Hybrid Journal   (Followers: 350, SJR: 0.726, h-index: 43)
Acta Automatica Sinica     Full-text available via subscription   (Followers: 3)
Acta Biomaterialia     Hybrid Journal   (Followers: 25, SJR: 2.02, h-index: 104)
Acta Colombiana de Cuidado Intensivo     Full-text available via subscription   (Followers: 1)
Acta de Investigación Psicológica     Open Access   (Followers: 2)
Acta Ecologica Sinica     Open Access   (Followers: 8, SJR: 0.172, h-index: 29)
Acta Haematologica Polonica     Free   (SJR: 0.123, h-index: 8)
Acta Histochemica     Hybrid Journal   (Followers: 3, SJR: 0.604, h-index: 38)
Acta Materialia     Hybrid Journal   (Followers: 240, SJR: 3.683, h-index: 202)
Acta Mathematica Scientia     Full-text available via subscription   (Followers: 5, SJR: 0.615, h-index: 21)
Acta Mechanica Solida Sinica     Full-text available via subscription   (Followers: 9, SJR: 0.442, h-index: 21)
Acta Oecologica     Hybrid Journal   (Followers: 10, SJR: 0.915, h-index: 53)
Acta Otorrinolaringologica (English Edition)     Full-text available via subscription   (Followers: 1)
Acta Otorrinolaringológica Española     Full-text available via subscription   (Followers: 3, SJR: 0.311, h-index: 16)
Acta Pharmaceutica Sinica B     Open Access   (Followers: 2)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 23, SJR: 1.365, h-index: 73)
Acta Sociológica     Open Access  
Acta Tropica     Hybrid Journal   (Followers: 6, SJR: 1.059, h-index: 77)
Acta Urológica Portuguesa     Open Access  
Actas Dermo-Sifiliograficas     Full-text available via subscription   (Followers: 4)
Actas Dermo-Sifiliográficas (English Edition)     Full-text available via subscription   (Followers: 3)
Actas Urológicas Españolas     Full-text available via subscription   (Followers: 4, SJR: 0.383, h-index: 19)
Actas Urológicas Españolas (English Edition)     Full-text available via subscription   (Followers: 2)
Actualites Pharmaceutiques     Full-text available via subscription   (Followers: 5, SJR: 0.141, h-index: 3)
Actualites Pharmaceutiques Hospitalieres     Full-text available via subscription   (Followers: 4, SJR: 0.112, h-index: 2)
Acupuncture and Related Therapies     Hybrid Journal   (Followers: 4)
Acute Pain     Full-text available via subscription   (Followers: 13)
Ad Hoc Networks     Hybrid Journal   (Followers: 11, SJR: 0.967, h-index: 57)
Addictive Behaviors     Hybrid Journal   (Followers: 15, SJR: 1.514, h-index: 92)
Addictive Behaviors Reports     Open Access   (Followers: 5)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 21)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 135, SJR: 5.2, h-index: 222)
Advanced Engineering Informatics     Hybrid Journal   (Followers: 11, SJR: 1.265, h-index: 53)
Advanced Powder Technology     Hybrid Journal   (Followers: 17, SJR: 0.739, h-index: 33)
Advances in Accounting     Hybrid Journal   (Followers: 9, SJR: 0.299, h-index: 15)
Advances in Agronomy     Full-text available via subscription   (Followers: 15, SJR: 2.071, h-index: 82)
Advances in Anesthesia     Full-text available via subscription   (Followers: 25, SJR: 0.169, h-index: 4)
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 3)
Advances in Applied Mathematics     Full-text available via subscription   (Followers: 6, SJR: 1.054, h-index: 35)
Advances in Applied Mechanics     Full-text available via subscription   (Followers: 11, SJR: 0.801, h-index: 26)
Advances in Applied Microbiology     Full-text available via subscription   (Followers: 22, SJR: 1.286, h-index: 49)
Advances In Atomic, Molecular, and Optical Physics     Full-text available via subscription   (Followers: 16, SJR: 3.31, h-index: 42)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4, SJR: 2.277, h-index: 43)
Advances in Botanical Research     Full-text available via subscription   (Followers: 3, SJR: 0.619, h-index: 48)
Advances in Cancer Research     Full-text available via subscription   (Followers: 25, SJR: 2.215, h-index: 78)
Advances in Carbohydrate Chemistry and Biochemistry     Full-text available via subscription   (Followers: 9, SJR: 0.9, h-index: 30)
Advances in Catalysis     Full-text available via subscription   (Followers: 5, SJR: 2.139, h-index: 42)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Chemical Engineering     Full-text available via subscription   (Followers: 26, SJR: 0.183, h-index: 23)
Advances in Child Development and Behavior     Full-text available via subscription   (Followers: 10, SJR: 0.665, h-index: 29)
Advances in Chronic Kidney Disease     Full-text available via subscription   (Followers: 9, SJR: 1.268, h-index: 45)
Advances in Clinical Chemistry     Full-text available via subscription   (Followers: 29, SJR: 0.938, h-index: 33)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 18, SJR: 2.314, h-index: 130)
Advances in Computers     Full-text available via subscription   (Followers: 16, SJR: 0.223, h-index: 22)
Advances in Dermatology     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 11)
Advances in Digestive Medicine     Open Access   (Followers: 6)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Drug Research     Full-text available via subscription   (Followers: 22)
Advances in Ecological Research     Full-text available via subscription   (Followers: 41, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 25, SJR: 0.486, h-index: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Experimental Social Psychology     Full-text available via subscription   (Followers: 41, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 50, SJR: 0.674, h-index: 38)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 16)
Advances in Genetics     Full-text available via subscription   (Followers: 15, SJR: 2.558, h-index: 54)
Advances in Genome Biology     Full-text available via subscription   (Followers: 11)
Advances in Geophysics     Full-text available via subscription   (Followers: 6, SJR: 2.325, h-index: 20)
Advances in Heat Transfer     Full-text available via subscription   (Followers: 22, SJR: 0.906, h-index: 24)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 0.497, h-index: 31)
Advances in Imaging and Electron Physics     Full-text available via subscription   (Followers: 2, SJR: 0.396, h-index: 27)
Advances in Immunology     Full-text available via subscription   (Followers: 35, SJR: 4.152, h-index: 85)
Advances in Inorganic Chemistry     Full-text available via subscription   (Followers: 9, SJR: 1.132, h-index: 42)
Advances in Insect Physiology     Full-text available via subscription   (Followers: 3, SJR: 1.274, h-index: 27)
Advances in Integrative Medicine     Hybrid Journal   (Followers: 6)
Advances in Life Course Research     Hybrid Journal   (Followers: 8, SJR: 0.764, h-index: 15)
Advances in Lipobiology     Full-text available via subscription   (Followers: 2)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 9)
Advances in Marine Biology     Full-text available via subscription   (Followers: 16, SJR: 1.645, h-index: 45)
Advances in Mathematics     Full-text available via subscription   (Followers: 10, SJR: 3.261, h-index: 65)
Advances in Medical Sciences     Hybrid Journal   (Followers: 6, SJR: 0.489, h-index: 25)
Advances in Medicinal Chemistry     Full-text available via subscription   (Followers: 5)
Advances in Microbial Physiology     Full-text available via subscription   (Followers: 4, SJR: 1.44, h-index: 51)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Molecular and Cellular Endocrinology     Full-text available via subscription   (Followers: 10)
Advances in Molecular Toxicology     Full-text available via subscription   (Followers: 7, SJR: 0.324, h-index: 8)
Advances in Nanoporous Materials     Full-text available via subscription   (Followers: 4)
Advances in Oncobiology     Full-text available via subscription   (Followers: 3)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15, SJR: 2.885, h-index: 45)
Advances in Parallel Computing     Full-text available via subscription   (Followers: 7, SJR: 0.148, h-index: 11)
Advances in Parasitology     Full-text available via subscription   (Followers: 7, SJR: 2.37, h-index: 73)
Advances in Pediatrics     Full-text available via subscription   (Followers: 24, SJR: 0.4, h-index: 28)
Advances in Pharmaceutical Sciences     Full-text available via subscription   (Followers: 13)
Advances in Pharmacology     Full-text available via subscription   (Followers: 15, SJR: 1.718, h-index: 58)
Advances in Physical Organic Chemistry     Full-text available via subscription   (Followers: 8, SJR: 0.384, h-index: 26)
Advances in Phytomedicine     Full-text available via subscription  
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3, SJR: 0.248, h-index: 11)
Advances in Plant Biochemistry and Molecular Biology     Full-text available via subscription   (Followers: 8)
Advances in Plant Pathology     Full-text available via subscription   (Followers: 5)
Advances in Porous Media     Full-text available via subscription   (Followers: 4)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 20, SJR: 1.5, h-index: 62)
Advances in Psychology     Full-text available via subscription   (Followers: 61)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 5, SJR: 0.478, h-index: 32)
Advances in Radiation Oncology     Open Access  
Advances in Small Animal Medicine and Surgery     Hybrid Journal   (Followers: 3, SJR: 0.1, h-index: 2)
Advances in Space Research     Full-text available via subscription   (Followers: 353, SJR: 0.606, h-index: 65)
Advances in Structural Biology     Full-text available via subscription   (Followers: 8)
Advances in Surgery     Full-text available via subscription   (Followers: 7, SJR: 0.823, h-index: 27)
Advances in the Study of Behavior     Full-text available via subscription   (Followers: 30, SJR: 1.321, h-index: 56)
Advances in Veterinary Medicine     Full-text available via subscription   (Followers: 17)
Advances in Veterinary Science and Comparative Medicine     Full-text available via subscription   (Followers: 13)
Advances in Virus Research     Full-text available via subscription   (Followers: 5, SJR: 1.878, h-index: 68)
Advances in Water Resources     Hybrid Journal   (Followers: 43, SJR: 2.408, h-index: 94)
Aeolian Research     Hybrid Journal   (Followers: 5, SJR: 0.973, h-index: 22)
Aerospace Science and Technology     Hybrid Journal   (Followers: 325, SJR: 0.816, h-index: 49)
AEU - Intl. J. of Electronics and Communications     Hybrid Journal   (Followers: 8, SJR: 0.318, h-index: 36)
African J. of Emergency Medicine     Open Access   (Followers: 5, SJR: 0.344, h-index: 6)
Ageing Research Reviews     Hybrid Journal   (Followers: 8, SJR: 3.289, h-index: 78)
Aggression and Violent Behavior     Hybrid Journal   (Followers: 405, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 15, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 39, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 1)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 54, SJR: 1.879, h-index: 120)
Ain Shams Engineering J.     Open Access   (Followers: 5, SJR: 0.434, h-index: 14)
Air Medical J.     Hybrid Journal   (Followers: 5, SJR: 0.234, h-index: 18)
AKCE Intl. J. of Graphs and Combinatorics     Open Access   (SJR: 0.285, h-index: 3)
Alcohol     Hybrid Journal   (Followers: 10, SJR: 0.922, h-index: 66)
Alcoholism and Drug Addiction     Open Access   (Followers: 8)
Alergologia Polska : Polish J. of Allergology     Full-text available via subscription   (Followers: 1)
Alexandria Engineering J.     Open Access   (Followers: 1, SJR: 0.436, h-index: 12)
Alexandria J. of Medicine     Open Access  
Algal Research     Partially Free   (Followers: 8, SJR: 2.05, h-index: 20)
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 3)
Allergologia et Immunopathologia     Full-text available via subscription   (Followers: 1, SJR: 0.46, h-index: 29)
Allergology Intl.     Open Access   (Followers: 4, SJR: 0.776, h-index: 35)
Alpha Omegan     Full-text available via subscription   (SJR: 0.121, h-index: 9)
ALTER - European J. of Disability Research / Revue Européenne de Recherche sur le Handicap     Full-text available via subscription   (Followers: 8, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 48, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 6)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 5)
American Heart J.     Hybrid Journal   (Followers: 49, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 47, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 39, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 8, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 15, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 31, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 25, SJR: 1.259, h-index: 81)
American J. of Kidney Diseases     Hybrid Journal   (Followers: 32, SJR: 2.313, h-index: 172)
American J. of Medicine     Hybrid Journal   (Followers: 45, SJR: 2.023, h-index: 189)
American J. of Medicine Supplements     Full-text available via subscription   (Followers: 3)
American J. of Obstetrics and Gynecology     Hybrid Journal   (Followers: 237, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 57, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 5)
American J. of Orthodontics and Dentofacial Orthopedics     Full-text available via subscription   (Followers: 6, SJR: 1.249, h-index: 88)
American J. of Otolaryngology     Hybrid Journal   (Followers: 25, SJR: 0.59, h-index: 45)
American J. of Pathology     Hybrid Journal   (Followers: 26, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 22, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 34, SJR: 1.286, h-index: 125)
American J. of the Medical Sciences     Hybrid Journal   (Followers: 12, SJR: 0.653, h-index: 70)
Ampersand : An Intl. J. of General and Applied Linguistics     Open Access   (Followers: 5)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 57, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 11)
Anales de Cirugia Vascular     Full-text available via subscription  
Anales de Pediatría     Full-text available via subscription   (Followers: 2, SJR: 0.209, h-index: 27)
Anales de Pediatría (English Edition)     Full-text available via subscription  
Anales de Pediatría Continuada     Full-text available via subscription   (SJR: 0.104, h-index: 3)
Analytic Methods in Accident Research     Hybrid Journal   (Followers: 4, SJR: 2.577, h-index: 7)
Analytica Chimica Acta     Hybrid Journal   (Followers: 37, SJR: 1.548, h-index: 152)
Analytical Biochemistry     Hybrid Journal   (Followers: 166, SJR: 0.725, h-index: 154)
Analytical Chemistry Research     Open Access   (Followers: 8, SJR: 0.18, h-index: 2)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 11)
Anesthésie & Réanimation     Full-text available via subscription   (Followers: 1)
Anesthesiology Clinics     Full-text available via subscription   (Followers: 22, SJR: 0.421, h-index: 40)
Angiología     Full-text available via subscription   (SJR: 0.124, h-index: 9)
Angiologia e Cirurgia Vascular     Open Access  
Animal Behaviour     Hybrid Journal   (Followers: 160, SJR: 1.907, h-index: 126)
Animal Feed Science and Technology     Hybrid Journal   (Followers: 5, SJR: 1.151, h-index: 83)
Animal Reproduction Science     Hybrid Journal   (Followers: 5, SJR: 0.711, h-index: 78)
Annales d'Endocrinologie     Full-text available via subscription   (Followers: 1, SJR: 0.394, h-index: 30)
Annales d'Urologie     Full-text available via subscription  
Annales de Cardiologie et d'Angéiologie     Full-text available via subscription   (SJR: 0.177, h-index: 13)
Annales de Chirurgie de la Main et du Membre Supérieur     Full-text available via subscription  
Annales de Chirurgie Plastique Esthétique     Full-text available via subscription   (Followers: 2, SJR: 0.354, h-index: 22)
Annales de Chirurgie Vasculaire     Full-text available via subscription   (Followers: 1)

        1 2 3 4 5 6 7 8 | Last   [Sort by number of followers]   [Restore default list]

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  [3043 journals]
  • Design and analysis of 0.127m (5″) Cutthroat flume

    • Authors: Rajib Das; Milan Nayek; Subhasish Das; Prasun Dutta; Asis Mazumdar
      Pages: 295 - 303
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Rajib Das, Milan Nayek, Subhasish Das, Prasun Dutta, Asis Mazumdar
      The aim of the present work was to perform series of detailed laboratory experiments under steady-state flow conditions through a Cutthroat flume of throat width 0.127m (5″) and length 0.918m. It is very important to perform research and propose equations for Cutthroat flume of throat-width 5″ as very rare work could be found on Cutthroat flume of this dimension. Experiments were conducted in laboratory designed and constructed 5″ throat width Cutthroat flume. Free flow and submerged flow calibrations were done within flow range of 0.005–0.0267m3/s. Equations applicable for both free flow and submerged flow regime were proposed and Ditchrider’s table for field implementation of the flume was prepared. Results of the calibration show that under favorable operating conditions of the discharge within calibrated flow, the proposed equation can determine accurately the discharge with maximum error up to +5% in both free flow and submerged flow regime.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.07.017
  • Design parameters for waste effluent treatment unit from beverages

    • Authors: Mona A. Abdel-Fatah; H.O. Sherif; S.I. Hawash
      Pages: 305 - 310
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Mona A. Abdel-Fatah, H.O. Sherif, S.I. Hawash
      Based on a successful experimental result from laboratory and bench scale for treatment of wastewater from beverages industry, an industrial and efficient treatment unit is designed and constructed. The broad goal of this study was to design and construct effluent, cost effective and high quality treatment unit. The used technology is the activated sludge process of extended aeration type followed by rapid sand filters and chlorination as tertiary treatment. Experimental results have been considered as the basis for full scale design of the industrial capacity of 1600m3/day treatment plant. Final effluent characteristics after treatment comply with Egyptian legalizations after reducing COD and BOD5 by about 97% and 95% respectively. So it is recommended to reuse treated effluent in textile industry in dyeing process.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2016.04.008
  • Quantifying and modeling of stream network using digital elevation models

    • Authors: Daisy Paul; V. Ravibabu Mandla; Tejpal Singh
      Pages: 311 - 321
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Daisy Paul, V. Ravibabu Mandla, Tejpal Singh
      Quantifying and modeling of stream network using DEMs is the primary objective to understand earth surface processes. In the present study, DEMs of different quality, i.e. resolution, are evaluated for stream network quantification and modeling. The results are very encouraging in terms of the shape and geometry of the stream network. They emphasize the strong control of the DEM resolution and thresholding of flow accumulation/drainage area. Further, comparisons of the various morphometric parameters are also quite promising. The study highlights different relationships between various morphometric parameters obtained from the two DEMs used, thereby paving the way for the use of DEMs of different resolutions, interchangeably.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.09.002
  • Fourier spectral methods for numerical solving the problem of boundary
           control of the linear wave equation

    • Authors: Hassan Zarei
      Pages: 333 - 339
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Hassan Zarei
      In this paper, a Fourier spectral method is used to reduce the optimal boundary control problem for a two-dimensional wave equation to a countable number of control problems for a one-dimensional wave equation which are transformed to the optimal control problems with integral constraints using the Laplace transform. The numerical integration and differentiation methods are used to approximate the resulting problems with quadratic programming problems. An illustrative numerical example is presented to indicate the efficiency of the proposed method.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.07.018
  • Radiative nanofluid flow and heat transfer over a non-linear permeable
           sheet with slip conditions and variable magnetic field: Dual solutions

    • Authors: Puneet Rana; Ruchika Dhanai; Lokendra Kumar
      Pages: 341 - 352
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Puneet Rana, Ruchika Dhanai, Lokendra Kumar
      Objective This paper addresses numerical investigation of steady, magneto-hydrodynamic boundary-layer slip flow of a nanofluid past a permeable stretching/shrinking sheet with thermal radiation using RKF45 with shooting technique. The effect of viscous dissipation, suction/injection, Brownian motion, thermophoresis, partial velocity slip and thermal slip is taken into account and controlled by the non-dimensional parameters. Results and conclusions The dual solutions are obtained for the skin friction, Nusselt number, temperature and nanoparticle volume fraction with pertinent parameters in the domain χ c , ∞ and s c , ∞ . The study shows that the Nusselt number decreases with an increase in thermophoresis parameter Nt and thermal slip parameter δ but increases with thermal radiation R and Prandtl number Pr. Practice implications The present problem has numerous applications in engineering and petroleum industries such as glass blowing, annealing and thinning of copper wires. The study of radiation heat transfer plays an important role in the industrial applications at high temperature.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.016
  • Dissipation effect on MHD mixed convection flow over a stretching sheet
           through porous medium with non-uniform heat source/sink

    • Authors: D. Bhukta; G.C. Dash; S.R. Mishra; S. Baag
      Pages: 353 - 361
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): D. Bhukta, G.C. Dash, S.R. Mishra, S. Baag
      Dissipative effect on magnetohydrodynamic (MHD) mixed convective unsteady flow of an electrically conducting fluid over a stretching sheet embedded in a porous medium subject to transverse magnetic field in the presence of non-uniform heat source/sink has been investigated in this paper. The method of solution involves similarity transformation. The coupled nonlinear partial differential equations governing flow, heat and mass transfer phenomena are reduced into set of nonlinear ordinary differential equations. The transformed equations are solved numerically by using Runge–Kutta fourth order method associated with shooting technique. The numerical computation of skin friction, Nusselt number and Sherwood number is presented in tables. The work of previous authors is compared with the present work as particular cases in the absence of unsteady parameter, solutal buoyancy, Darcy dissipation and chemical reaction. The results of steady and unsteady cases are also discussed. The important findings are as follows: effect of electric field enhances the skin friction contributing to flow instability. Higher Prandtl number is suitable for the reduction of coefficient of skin friction which is desirable.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.017
  • Fibonacci-regularization method for solving Cauchy integral equations of
           the first kind

    • Authors: Mohammad Ali Fariborzi Araghi; Samad Noeiaghdam
      Pages: 363 - 369
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Mohammad Ali Fariborzi Araghi, Samad Noeiaghdam
      In this paper, a novel scheme is proposed to solve the first kind Cauchy integral equation over a finite interval. For this purpose, the regularization method is considered. Then, the collocation method with Fibonacci base function is applied to solve the obtained second kind singular integral equation. Also, the error estimate of the proposed scheme is discussed. Finally, some sample Cauchy integral equations stem from the theory of airfoils in fluid mechanics are presented and solved to illustrate the importance and applicability of the given algorithm. The tables in the examples show the efficiency of the method.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.018
  • Artificial chemical reaction optimization of neural networks for efficient
           prediction of stock market indices

    • Authors: S.C. Nayak; B.B. Misra; H.S. Behera
      Pages: 371 - 390
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): S.C. Nayak, B.B. Misra, H.S. Behera
      The underlying system models of time series prediction are complex and not known a priori, hence, accurate and unbiased estimation cannot be always achieved using well known linear techniques. The estimation process requires more advanced prediction algorithms, such as multilayer perceptrons (MLPs). This paper presents an artificial chemical reaction neural network (ACRNN), which uses artificial chemical reaction optimization (ACRO) to train the MLP models for forecasting the stock market indices. The underlying motivation for using ACRO is the ability to overcome the issues of convergence, parameter setting and overfitting and to accurately forecast financial time series data even when the underlying system processes are typically nonlinear. Historical data of seven different stock indices have been collected for 15years to test the performance of the ACRNN approach. After extensive experimentation, it is observed that the ACRNN technique demonstrates significant improvements in prediction accuracy over the MLP approach.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.07.015
  • DSTATCOM allocation in distribution networks considering load variations
           using bat algorithm

    • Authors: T. Yuvaraj; K. Ravi; K.R. Devabalaji
      Pages: 391 - 403
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): T. Yuvaraj, K. Ravi, K.R. Devabalaji
      This paper proposes a new method of scheduling for optimal placement and sizing of Distribution STATic COMpensator in the radial distribution networks to minimize the power loss. In the proposed method Voltage Stability Index is used to search the optimal placement for installation of DSTATCOM. Optimal size of DSTATCOM is found by using bat algorithm. The feeder loads are varied by linearly from light load to peak load with a step size of 1%. In each load step, the optimal placement and sizing for DSTATCOM are calculated. By using the Curve Fitting Technique, the optimal sizing for DSTATCOM per load level is formulated in the form of generalized equation. The proposed approach will help the Distribution Network Operators to select the DSTATCOM size according to the load changes. To check the feasibility of the proposed method, system has been tested on two standard buses such as IEEE 33 and 69 bus radial distribution systems.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.006
  • Improvement of Protection Coordination for a Distribution System Connected
           to a Microgrid using Unidirectional Fault Current Limiter

    • Authors: Mazen Abdel-Salam; Ahmed Abdallah; Rashad Kamel; Mohamed Hashem
      Pages: 405 - 414
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Mazen Abdel-Salam, Ahmed Abdallah, Rashad Kamel, Mohamed Hashem
      The presence of distributed generation (DG) units in distribution systems increases the fault current level, which disrupts the existing coordination time interval of the protective overcurrent relays. One of the ways for decreasing DG effects on the coordination of protective devices is re-coordination of the relays by installing unidirectional fault current limiter (UFCL) between the main grid (upstream network) and the microgrid (downstream network). The UFCL does not limit fault current contribution of the upstream network when fault occurs in downstream but limits fault current contribution of the downstream network when fault occurs in the upstream. Moreover, it preserves the coordination between all of the relays. Several case studies are carried out for illustrating the performance of the UFCL in maintaining the relay coordination.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.008
  • A new approach for power quality improvement of DFIG based wind farms
           connected to weak utility grid

    • Authors: Hossein Mahvash; Seyed Abbas Taher; Mohsen Rahimi
      Pages: 415 - 430
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Hossein Mahvash, Seyed Abbas Taher, Mohsen Rahimi
      Most of power quality problems for grid connected doubly fed induction generators (DFIGs) with wind turbine include flicker, variations of voltage RMS profile, and injected harmonics due to switching in DFIG converters. Flicker phenomenon is the most important problem in wind power systems. This paper described an effective method for mitigating flicker emission and power quality improvement for a fairly weak grid connected to a wind farm with DFIGs. The method was applied in the rotor side converter (RSC) of the DFIG to control the output reactive power. q axis reference current was directly derived according to the mathematical relation between rotor q axis current and DFIG output reactive power without using PI controller. To extract the reference reactive power, the stator voltage control loop with the droop coefficient was proposed to regulate the grid voltage level in each operational condition. The DFIG output active power was separately controlled in d axis considering the stator voltage orientation control (SVOC). Different simulations were carried out on the test system and the flicker short term severity index ( P st ) was calculated for each case study using the discrete flickermeter model according to IEC 61400 standard. The obtained results validated flicker mitigation and power quality enhancement for the grid.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.09.001
  • Power flow modeling of Back-to-Back STATCOM: Comprehensive simulation
           studies including PV curves and PQ circles

    • Authors: Ahmet Mete Vural; Kamil Çağatay Bayındır
      Pages: 431 - 443
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Ahmet Mete Vural, Kamil Çağatay Bayındır
      Power flow study in a power network embedded with FACTS device requires effort in program coding. Moreover, Newton-Raphson method should be modified by embedding injected power components into the algorithm. In this study, we have proposed a method for modeling of one of the newest FACTS concepts in power flow study without program coding or modification of existing Newton-Raphson algorithm. Real and reactive power injections for each voltage source converter of Back-to-Back Static Synchronous Compensator (BtB-STATCOM) are PI regulated to their desired steady-state values. With this respect, reactive power injection of each voltage source converter as well as real power transfer among them can be assigned as control constraint. Operating losses are also taken into account in the proposed modeling approach. Furthermore, proposed model can be easily modified for the modeling of conventional STATCOM having only one voltage source converter or two STATCOMs operating independently. The proposed modeling approach is verified in PSCAD through a number of simulation scenarios in BtB-STATCOM and STATCOM embedded power systems, namely 1-Machine 4-Bus system and 3-Machine 7-Bus system. PV curves of local buses compensated by BtB-STATCOM and STATCOM are presented and compared. Steady-state performance of BtB-STATCOM and STATCOM is also compared in power flow handling.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2016.07.004
  • Dynamic power management techniques in multi-core architectures: A survey

    • Authors: Khaled M. Attia; Mostafa A. El-Hosseini; Hesham A. Ali
      Pages: 445 - 456
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Khaled M. Attia, Mostafa A. El-Hosseini, Hesham A. Ali
      Multi-core processors support all modern electronic devices nowadays. However, power management is one of the most critical issues in the design of today’s microprocessors. The goal of power management is to maximize performance within a given power budget. Power management techniques must balance between the demanding needs for higher performance/throughput and the impact of aggressive power consumption and negative thermal effects. Many techniques have been proposed in this area, and some of them have been implemented such as the well-known DVFS technique which is used in nearly all modern microprocessors. This paper explores the concepts of multi-core, trending research areas in the field of multi-core processors and then concentrates on power management issues in multi-core architectures. The main objective of this paper is to survey and discuss the current power management techniques. Moreover, it proposes a new technique for power management in multi-core processors based on that survey.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.08.010
  • Modelling and transient simulation of water flow in pipelines using WANDA
           Transient software

    • Authors: P.U. Akpan; S. Jones; M.N. Eke; H. Yeung
      Pages: 457 - 466
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): P.U. Akpan, S. Jones, M.N. Eke, H. Yeung
      Pressure transients in conduits such as pipelines are unsteady flow conditions caused by a sudden change in the flow velocity. These conditions might cause damage to the pipelines and its fittings if the extreme pressure (high or low) is experienced within the pipeline. In order to avoid this occurrence, engineers usually carry out pressure transient analysis in the hydraulic design phase of pipeline network systems. Modelling and simulation of transients in pipelines is an acceptable and cost effective method of assessing this problem and finding technical solutions. This research predicts the pressure surge for different flow conditions in two different pipeline systems using WANDA Transient simulation software. Computer models were set-up in WANDA Transient for two different systems namely; the Graze experiment (miniature system) and a simple main water riser system based on some initial laboratory data and system parameters. The initial laboratory data and system parameters were used for all the simulations. Results obtained from the computer model simulations compared favourably with the experimental results at Polytropic index of 1.2.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.09.006
  • Homogeneous–heterogeneous reactions in stagnation point flow of Casson
           fluid due to a stretching/shrinking sheet with uniform suction and slip

    • Authors: Mariam Sheikh; Zaheer Abbas
      Pages: 467 - 474
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): Mariam Sheikh, Zaheer Abbas
      This study deals with the effects of homogeneous–heterogeneous reaction on boundary layer flow of a non-Newtonian fluid near a stagnation point over a porous stretching/shrinking sheet with a constant suction. In this analysis Casson fluid is used to indicate the non-Newtonian fluid behavior by taking diffusion coefficients of both reactant and autocatalysis equal. The basic flow equations in form of partial differential equations are converted into a system of ordinary differential equations and then solved numerically. The influences of physical and fluid parameters on the velocity and concentration profiles are analyzed, presented and discussed through graphs. An increase in fluid velocity slip parameter reduces the magnitude of the velocity as well as increases the concentration in the boundary layer region. Furthermore, a unique solution is possible for all values of the stretching parameter (λ >0), while in case of shrinking parameter (λ <0), solutions are possible only for its limited ranges.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2015.09.010
  • Processing of a metastable titanium alloy (Ti-5553) by selective laser

    • Authors: C. Zopp; S. Blümer; F. Schubert; L. Kroll
      Pages: 475 - 479
      Abstract: Publication date: September 2017
      Source:Ain Shams Engineering Journal, Volume 8, Issue 3
      Author(s): C. Zopp, S. Blümer, F. Schubert, L. Kroll
      The metastable beta titanium alloy Ti-5Al-5V-5Mo-3Cr is characterised by multifaceted mechanical properties (high - strength, hardened, ductile) depending on applied heat treatment. Compared to α-β titanium alloy Ti-6Al-4V, a higher tensile strength up to 1400MPa as well as a yield strength of 1250MPa can be achieved. As a result, Ti-5553 is used for special aerospace applications e.g. landing gear components or helicopter rotors. Aim of this paper is to study the processibility of Ti-5553 by using selective laser melting. First, a suitable and stable process parameter set for a reference grain fraction (10–63μm) have been developed. Second, variations of grain size distribution will be taken into account, so that a high material density as well as high surface quality can be achieved. Furthermore, an identical process window was applied on fine and coarse grain fractions to show effects regarding material porosity. Material densities above 99.93% were achieved by optimisation of energy input during selective laser melting process. However, the use of reference fraction (10–63μm) allowed the highest material density. Regarding to surface quality, an impact of coarse grain (53–63μm) was identified and an optimised grain size distribution derived. An optimum averaged surface roughness could be calculated, using a grain size between 25–32μm.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2016.11.004
  • 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: 2017-10-12T05:39:13Z
      DOI: 10.1016/j.asej.2017.05.001
  • Golden section search based maximum power point tracking strategy for a
           dual output DC-DC converter

    • Authors: R. Gayathri; G.A. Ezhilarasi
      Abstract: Publication date: Available online 12 September 2017
      Source:Ain Shams Engineering Journal
      Author(s): R. Gayathri, G.A. Ezhilarasi
      This paper introduces an Golden Section Search based algorithm, along with an single input multi output DC-DC converter for photovoltaic systems. In contemplation for photovoltaic (PV) systems to escalate their efficiency of power generation, it is mandatory to locate the Maximum power point (MPP) under all possible illumination conditions. Maximum power point tracking (MPPT) controller is expected to obtain the MPP irrespective of the device and climatic changes. The basic principle and the implementation of the system is elaborated in this paper, along with an comparison of different hill-climbing algorithms. The analytic and simulated results show that the new method has the advantages of fast convergence, noise-resistance, and robustness.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2017.04.008
  • Parameterless earth fault locator algorithm based on transient surges
           resulting from single-pole breaker opening

    • Authors: Eman S. Ahmed
      Abstract: Publication date: Available online 12 September 2017
      Source:Ain Shams Engineering Journal
      Author(s): Eman S. Ahmed
      This paper proposes a novel concept for ground faults locating on the basis of the traveling waves principles for EHV transmission systems. The transient surges generated due to single-pole breaker opening are localized in order to determine the accurate fault distance on the basis of single-end measurements. The proposed fault location concept is independent of the propagation speed. Also, the proposed strategy of creating traveling surges is exploited with synchronized double-end measurements. Time extraction of traveling surges is performed using the second derivative of the aerial mode voltage after breaker pole opening. The proposed algorithm is evaluated using transmission systems of multiple terminals. The results provide evidence the efficacy of the proposed fault location mechanism.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2017.08.002
  • Estimating the future energy efficiency and CO2 emissions of passive
           country housing applying domestic biogas reactor: A case study in Egypt

    • Authors: Mohammad Fahmy; Mohamed M. Mahdy; Hosam Rizk; Marwa F. Abdelaleem
      Abstract: Publication date: Available online 9 September 2017
      Source:Ain Shams Engineering Journal
      Author(s): Mohammad Fahmy, Mohamed M. Mahdy, Hosam Rizk, Marwa F. Abdelaleem
      This paper investigates the role of passive design strategies and using biogas in reducing energy consumption, annual energy cost and CO2 emissions of a new productive country housing model in an ongoing sustainable community development project near Cairo, Egypt. The country housing character follows the vernacular architecture of such hot arid areas through the application of courtyards, vaults and domes with two different materials for the building envelop. The traditional 25cm red bricks were used in the first case, whilst the second sustainable one is a prefabricated sandwich panel construction of 15cm GRC walls. The opportunity of using 2m3 biogas reactors is promising in such housing projects that have an area for raising domestic animals along with the waste supplies from each house agriculture zone. Design Builder simulations took place in present and future showed considerable reductions of energy consumption, annual energy cost and CO2 emissions estimations in the sustainable option with the biogas passive house.

      PubDate: 2017-09-14T22:57:16Z
      DOI: 10.1016/j.asej.2017.08.004
  • A semi-analytical iterative method for solving differential algebraic

    • Authors: Majeed Al-Jawary; Sinan Hatif
      Abstract: Publication date: Available online 30 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Majeed Al-Jawary, Sinan Hatif
      This work presents new implementation of an iterative method proposed by Temimi and Ansari namely (TAM) for approximate solutions of differential algebraic equations that arises in many engineering and applied sciences applications. The solution is obtained with easy computed components without any restrictive assumptions to deal with the nonlinear terms. The numerical results obtained by TAM are better accuracy and faster convergence in comparison to the homotopy perturbation method. Error analysis of the approximate solution is studied using the absolute error and high convergence is achieved. A symbolic manipulator Mathematica®10 was used to evaluate terms in the iterative process.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.07.004
  • Evaluation of local scour around bridge piers for various geometrical
           shapes using mathematical models

    • Authors: Ahmed Moustafa Ahmed Moussa
      Abstract: Publication date: Available online 24 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Ahmed Moustafa Ahmed Moussa
      Bridges are one of the important structures across the Nile River; these bridges may be subjected to collapse if there is no monitoring or safety precaution for local scour during high floods. This research was commenced in order to evaluate the scour around bridge piers. 1-D and 2-D mathematical models were applied to Aswan and El Minia bridges, in the 1st and 4th reaches, respectively. The two bridges are considered two major bridges so their impacts should be studied. Total Scour (local, contraction and long-term degradation) was evaluated and the expected morphological changes were estimated. The local scour and contraction scour at Aswan Bridge is higher than El-Minia Bridge due to the big dimensions of piers. 2D model gives accurate results especially in the non-uniform cross sections. It was found that the smallest local scour was obtained in case of sharp nosed piers at normal flow to the piers.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.08.003
  • Improvement of transient stability of DFIG based wind generator by using
           of resistive solid state fault current limiter

    • Authors: Md Emrad Hossain
      Abstract: Publication date: Available online 19 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Md Emrad Hossain
      Currently, the application of variable wind speed machines, especially doubly-fed induction generator (DFIG) becomes very effective in the fast growing wind generator (WG) market due to its advantageous property of partial converter ratings and ability to adapt to variable wind speed. The foremost concern for the DFIG based WG system is to maintain the transient stability during fault, as the stator of the DFIG is directly connected to the grid. In this paper, a simple controller based resistive solid-state fault current limiter (R-type SSFCL) is proposed to augment the transient stability of the DFIG based WG system. In simulations, temporary balanced and unbalanced faults were applied in the test system model to investigate the R-type SSFCL transient stability performance. A series dynamic braking-resistor (SDBR) and an LR-type solid-state fault current limiter (SSFCL-LR) are also considered to compare their performance with the proposed R-type SSFCL. These simulations were performed with Matlab/Simulink software. Simulation results clearly indicate that the R-type SSFCL enhances the transient stability of the DFIG system and it works better than the SDBR and SSFCL-LR in every aspect.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.03.014
  • A cuckoo search algorithm optimizer for steady-state analysis of
           self-excited induction generator

    • Authors: Hany M. Hasanien; Gamal M. Hashem
      Abstract: Publication date: Available online 16 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Hany M. Hasanien, Gamal M. Hashem
      Renewable energy systems especially the wind energy grows worldwide continuously. Also, installations of the wind farms increase in remote area applications. The self-excited induction generator (SEIG) is an effective choice for using in these applications due to its merits. This paper presents a cuckoo search algorithm (CSA) optimizer for steady state analysis of the SEIG. The mathematical model of the SEIG is based on equivalent circuit loop impedance method. The target of optimization is to minimize the total equivalent circuit impedance of the generator in order to obtain the frequency and any other unknown parameter of the SEIG. In this study, the frequency and magnetizing reactance define the search space for the optimization problem. The MATLAB CSA optimization toolbox is used to solve optimization problem. The effectiveness of the proposed optimizer is evaluated on a 220V, 0.75kW induction generator for various operating conditions. The effectiveness of the CSA model is then compared with other conventional optimization models. The validity of the proposed optimizer is verified by experimental results. With this proposed CSA optimization technique, a faster and an accurate prediction for steady state analysis of the SEIG are achieved.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.07.003
  • A comparative study of soft computing methods to solve inverse kinematics

    • Authors: Ahmed El-Sherbiny; Mostafa A. Elhosseini; Amira Y. Haikal
      Abstract: Publication date: Available online 14 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Ahmed El-Sherbiny, Mostafa A. Elhosseini, Amira Y. Haikal
      Robot arms are essential tools nowadays in industries due to its accuracy through high speed manufacturing. One of the most challenging problems in industrial robots is solving inverse kinematics. Inverse Kinematic Problem concerns with finding the values of angles which are related to the desired Cartesian location. With the development of Softcomputing-based methods, it's become easier to solve the inverse kinematic problem in higher speed with sufficient solutions rather than using traditional methods like numerical, geometric and algebraic. This paper presents a comparative study between different soft-computing based methods (Artificial Neural Network, Adaptive Neuro Fuzzy Inference System & Genetic Algorithms) applied to the problem of inverse kinematics. With the help of proposed method called minimized error function, both ANN and ANFIS are able to outperform other methods. The experimental test are done using 5DOF robot arm and analyzing the results proved the simulation results.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.08.001
  • Frequency-domain modeling of time-periodic switched electrical networks: A

    • Authors: Abner Ramirez; Mohamed Abdel-Rahaman; Taku Noda
      Abstract: Publication date: Available online 12 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Abner Ramirez, Mohamed Abdel-Rahaman, Taku Noda
      Power networks are, in nature, nonlinear time-variant systems. Starting with synchronous machines, which function as generators, passing by transmission and distribution networks whose topologies are altered due to different switching actions in the network, and ending with uncontrolled loads, which depend to a large extent on customer behavior and their dynamics. Despite the aforementioned nature, power system analysis mainly relies on taking snap shots of the system to estimate its behavior under different conditions, e.g., normal operation load flow, short circuit analysis, etc. Nevertheless, the time-varying characteristic of modern power systems, e.g., time-periodic switching of power electronic converters, impacts the overall network behavior; such impact can be interpreted as overvoltages, waveform distortion, resonance conditions, and even instability. Here the need to account for time-varying nature in modeling of modern power networks. Frequency-domain (FD) provides a convenient domain to solve a set of differential equations that describes the system as algebraic equations for the aforementioned studies, though limited to linear systems. In performing power system studies, periodic nature of rotating machines is accounted for by Park's transformation, which is able to mask the time-periodic nature of the machine in a manner that does not compromise the simplicity of the solution. Yet, the introduction of converters sidestepped FD for network analyses to the favor of time-domain (TD) analysis tools, albeit their relative complexity and large computational times. However, since the inception of the need to analyze time-periodic (TP) systems in general, numerous techniques evolved with varying degrees of success to provide a practical tool for network studies. This paper provides a brief of those efforts. The paper discusses Floquet theory, Harmonic Domain Dynamic Transfer Functions, and Equivalent Signal theory as tools for analysis of TP power systems, putting special attention to switched networks. Also, the paper compares those tools from the points of view of: (i) computational effort for model preparation, (ii) possible applications to modern power networks, and (iii) suitability for integration with present network analysis tools.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.07.002
  • Simplified iterative reproducing kernel method for handling
           time-fractional BVPs with error estimation

    • Authors: Mohammed Al-Smadi
      Abstract: Publication date: Available online 7 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Mohammed Al-Smadi
      In this article, we introduce a novel numerical scheme, the iterative reproducing kernel method (IRKM), for providing numerical approximate solutions of a certain class of time-fractional boundary value problem within favorable aspects of the reproducing kernel Hilbert space in Caputo sense. The algorithm methodology is based on generating an orthonormal basis from the reproducing kernel function to formulate the solution in form of uniformly convergent series, accordance with the constraint conditions in the space ω 5 [ 0 , 1 ] . Error estimates in the ω 5 -norm are obtained as well as numerical experiments are described to represent the hypothesis, and to confirm the design procedure of the proposed algorithm. The numerical results indicate that the IRKA is a significant development tool for handling such issues arising in computer, physics and engineering fields.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.04.006
  • MHD oscillatory flow of a Jeffrey fluid in a vertical porous channel with
           viscous dissipation

    • Authors: R.K. Selvi; R. Muthuraj
      Abstract: Publication date: Available online 7 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): R.K. Selvi, R. Muthuraj
      The aim of this article is to investigate unsteady MHD convective flow in a vertical porous channel with viscous dissipation. The fluid is assumed to be non Newtonian, namely Jeffrey fluid and diffusion-thermo, thermal diffusion effect, suction are also taken into account. The governing coupled partial differential equations of the problem is reduced to ordinary differential equations and then solved by homotopy analysis method (HAM). The velocity, temperature and concentration fields are discussed with different values of involved parameter with the help of graphs. In addition, variations on coefficient of skin friction, heat and mass transfer coefficients are tabulated with different values of pertinent parameters. Comparison is made present solution (HAM) with numerical solution by using NDSolver in Mathematica. A suitable comparison has also been made as a limiting case of the considered problem. It is found that increasing magnetic parameter and suction parameter tends to suppress the fluid velocity while the reverse trend can be seen with material parameter. Thermal parameters are lead to enhance the fluid temperature whereas fluid temperature is decreasing function with increasing inertia coefficient. Volume flow rate decreases continuously with increasing suction parameter while it increases gradually with increasing viscosity parameter. Increasing Grashof number tends to enhance skin friction while increasing magnetic parameter leads to decrease the skin friction at the left wall. Further, increasing Soret number leads to suppress Sherwood number gradually at the left wall whereas mixed behavior can be noticed on Sherwood number distribution at the other wall.

      PubDate: 2017-09-03T09:35:50Z
      DOI: 10.1016/j.asej.2017.05.009
  • About Kepler’s Third Law on fractal-time spaces

    • Authors: Alireza K. Golmankhaneh
      Abstract: Publication date: Available online 2 August 2017
      Source:Ain Shams Engineering Journal
      Author(s): Alireza K. Golmankhaneh
      In this paper, a mathematical model for fractal-time space is given involving F α -calculus. Differential equations corresponding of the free fall motion and simple harmonic oscillator on fractal-time space are given and solved. Moreover, using scale transformation and invariant properties of physical laws we obtained the generalized Kepler’s Third Law of motion on fractal-time space.

      PubDate: 2017-08-03T10:24:10Z
      DOI: 10.1016/j.asej.2017.06.005
  • A design of Microstrip Patch Antenna using hybrid fractal slot for
           wideband applications

    • Authors: Narinder Sharma; Vipul Sharma
      Abstract: Publication date: Available online 22 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Narinder Sharma, Vipul Sharma
      The paper presents a design of Microstrip Patch Antenna (MPA) using hybrid fractal slot (Koch-Minkowski and Koch-Koch) along with partial ground plane for wideband applications. The length of partial ground plane is varied to optimize the bandwidth and gain of antenna. It has been observed that the ground plane length 8mm exhibits best result in terms of bandwidth and gain. The MPA with Koch-Minkowski slot depicts 2260MHz bandwidth, 6.1dB gain and two resonant frequencies 2.47GHz and 8.92GHz whereas with Koch-Koch slot it reports 2440GHz bandwidth, 5.62dB gain, and resonant frequencies 2.77GHz and 8.62GHz. The proposed antennas are fabricated and measured bandwidth for Koch-Minkowski slot is 3326MHz and for the Koch-Koch slot is 3237MHz. The simulated results of proposed antennas are compared with measured results and observed the reasonable agreement with each other.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.05.008
  • Sentiment analysis in Arabic: A review of the literature

    • Authors: Naaima Boudad; Rdouan Faizi; Rachid Oulad Haj Thami; Raddouane Chiheb
      Abstract: Publication date: Available online 21 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Naaima Boudad, Rdouan Faizi, Rachid Oulad Haj Thami, Raddouane Chiheb
      Within the last couple of years, Sentiment Analysis in Arabic has gained a considerable interest from the research community. In this respect, the objective of this paper is to provide a review of the major works that have dealt with this research area in this language. A thorough investigation of the available literature revealed that the works were mainly concentrated on dealing with specific Sentiment Analysis tasks. To this end, they used three different approaches, namely supervised, unsupervised and hybrid. The results that these studies achieved are interesting but divergent. This divergence is relatively due to the type of approach opted for, the task that is being analysed as well as to the specificities and intricacies of the Arabic variety understudy.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.04.007
  • Bearing fault detection in a 3 phase induction motor using stator current
           frequency spectral subtraction with various wavelet decomposition

    • Authors: K.C. Deekshit Kompella; Mannam Venu Gopala Rao; Rayapudi Srinivasa Rao
      Abstract: Publication date: Available online 14 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): K.C. Deekshit Kompella, Mannam Venu Gopala Rao, Rayapudi Srinivasa Rao
      Induction motors consumes 90% of total power consumed by industries due to large scale utilisation. Even though these motors are rugged in structure, they often face unexpected failure due to long usage without maintenance. Bearing failure is a major problem among various faults, which cause catastrophic damage to machine when unnoticed at incipient stage. So the bearing faults in induction machines should be continuously monitored. Motor current signature analysis (MCSA) has become popular for detection and localisation of these faults and has attracted concentration of many researchers. In this paper stator current is monitored by means of frequency spectral subtraction using various wavelet transforms to suppress dominant components. The spectral subtraction using discrete wavelet transform (DWT), stationary wavelet transform (SWT) and wavelet packet decomposition (WPD) is performed and a comparative analysis is carried out by means of different fault indexing parameters. The proposed topology is examined using 2.2kW induction machine test bed.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.06.002
  • Effect of soil-foundation-structure interaction on the seismic response of
           wind turbines

    • Authors: Sam Austin; Sukhvarsh Jerath
      Abstract: Publication date: Available online 14 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Sam Austin, Sukhvarsh Jerath
      Soil-foundation-structure interaction can affect the seismic response of wind turbines. This paper studies the effects of soil-foundation-structure interaction on the seismic response of 65kW, 1MW, and 2MW horizontal-axis wind turbines with truncated cone steel towers. Four types of foundations with frequency-based design were analyzed, including spread foundation, mono pile, pile group with cap, and anchored spread foundation. Soil is modeled both implicitly (subgrade reaction modulus) and explicitly. The finite element model developed using the ANSYS program was first validated using experimental data. Numerical models are then analyzed in both frequency and time domains using the Block Lanczos and generalized HHT-α formulations. Recommendations were given to simplify the soil-foundation-structure interaction analysis of wind turbines subjected to seismic loading.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.05.007
  • Understanding the behavior of RTD-loaded NMOS inverter through
           compact-form analysis

    • Authors: Sherif M. Sharroush
      Abstract: Publication date: Available online 14 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Sherif M. Sharroush
      Resonant-tunneling diodes (RTDs) find a wide variety of applications in oscillators, digital circuits, and latches due to their reduced circuit complexity, low power, and high speed. Since the inverter is the main building block in digital design, in this paper, the analysis of the RTD-loaded NMOS inverter is addressed quantitatively with its static and dynamic characteristics investigated and compared with that of the conventional static CMOS inverter. Specifically, compact-form expressions are derived for the critical points of the voltage-transfer characteristics (VTC), the low-to-high, and the high-to-low propagation delays along with the fan-out. Also, the static- and dynamic–power consumption are investigated and equations are derived for them. The results obtained from this analysis can be generalized to RTD-MOS logic-circuit family in which the pull-down network contains properly connected and appropriately sized NMOS transistors and the pull-up network is the RTD device. The results of the quantitative analysis are discussed and verified by comparison with the simulation results using the Berkeley predictive-technology model (BPTM) of the 45nm CMOS technology with a power-supply voltage of 1V.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.06.001
  • Condition monitoring of wind turbine for rotor fault detection under non
           stationary conditions

    • Authors: Himani; Ratna Dahiya
      Abstract: Publication date: Available online 14 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Himani, Ratna Dahiya
      Condition monitoring of Wind Turbine based induction generators still faces challenges due to their operation in harsh and aggressive environments. The detection of anomalies at an initial stage is necessary for reducing the downtime of Wind Turbines. Depending on wind speed, the wind turbine generator operates continuously in non-stationary conditions. Under non-stationary conditions, the rotor fault frequency components present at generator output spreads out on bandwidth proportional to the speed which complicates its detectability. Therefore, this paper proposes a potential approach based on the use of wavelet analysis for diagnosing rotor eccentricity fault using WTG electrical signals. Its effectiveness under speed and load varying conditions is validated by experiments on a wind turbine condition monitoring test rig. The effectiveness of the setup was benchmarked with already proven WT test rigs.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.04.002
  • Numerical simulation of scour and flow field for different arrangements of
           two piers using SSIIM model

    • Authors: Amirreza Hamidi; Seyed Mostafa Siadatmousavi
      Abstract: Publication date: Available online 13 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Amirreza Hamidi, Seyed Mostafa Siadatmousavi
      Scour around bridge piers in the flow is an inevitable issue. In this study, the numerical model SSIIM was used to simulate both the flow field and scour pattern around side by side piers. Both k – ɛ and k – ω turbulence models were employed to solve the eddy viscosity of flow equations and their performances were evaluated. Temporal investigation of the higher accurate turbulence model were presented. Moreover, the model was skill-assessed for different pile spacing ( G / D ) in side by side piers and several angles of piers (α) in staggered arrangements and their numerical results were obtained. Although model was successful in reproducing the scour depth in front of piers for side by side piers, it overestimated the bed scour depth between the piles. Furthermore, in the staggered arrangements, the numerical model underestimated the scour depth in front piles while good agreements were achieved between the piers in different angles of attack.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.03.012
  • NERC’s control performance standards based load frequency controller for
           a multi area deregulated power system with ANFIS approach

    • Authors: Abhijith Pappachen; A. Peer Fathima
      Abstract: Publication date: Available online 13 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Abhijith Pappachen, A. Peer Fathima
      This paper presents the design of a North American Reliability Council (NERC) standards BAL-001-2 based Adaptive Neuro-Fuzzy Interface System (ANFIS) controller for multi-area deregulated power system under different contract scenarios. The proposed controller is tested on the Indian regional grid system and its control performance standards are compared with the conventional PID controller and ANFIS controller. The major objectives are (i) To find a suitable control for mitigating the diverse LFC problems in a deregulated power system (ii) to comply with the NERC control performance standards which are CPS1, CPS2 and BAAL, and (iii) to reduce the wear and tear of the generating units. Dynamic modelling of controllers, test system and simulation studies are performed using MATLAB/Simulink environment. The simulation results validate that the NERC standards based ANFIS controller is one of the best controller for the four area Indian regional grid under deregulated environment.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.05.006
  • Managing risks of the Grand Ethiopian Renaissance Dam on Egypt

    • Authors: Walaa Y. El-Nashar; Ahmed H. Elyamany
      Abstract: Publication date: Available online 12 July 2017
      Source:Ain Shams Engineering Journal
      Author(s): Walaa Y. El-Nashar, Ahmed H. Elyamany
      Egypt depends on the Nile River to secure 95% of the water needed for different purposes as drinking, household uses, agriculture, fishing source, water transportation, tourism, electricity generation from the High Dam and industry. Although, the Grand Ethiopian Renaissance Dam (GERD) is essential to Ethiopia’s development, many research pointed out its negative impact on Egypt. Although previous researches addressed the problem of GERD using stochastic data, they used deterministic methods. This paper aims to use a stochastic method to assess risks of GERD on Egypt, and propose strategies to mitigate these risks. Management actions and policies are proposed to manage fresh water resources and mitigate GERD risks. The study concluded that the expected amount of saved water using proposed strategies exceeds the expected losses caused by GERD by 12.1Billionm3. Adopting the suggested strategies could reduce or eliminate the impact of GERD on Egypt.

      PubDate: 2017-07-24T00:31:35Z
      DOI: 10.1016/j.asej.2017.06.004
  • 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
School of Mathematical and Computer Sciences
Heriot-Watt University
Edinburgh, EH14 4AS, UK
Tel: +00 44 (0)131 4513762
Fax: +00 44 (0)131 4513327
Home (Search)
Subjects A-Z
Publishers A-Z
Your IP address:
About JournalTOCs
News (blog, publications)
JournalTOCs on Twitter   JournalTOCs on Facebook

JournalTOCs © 2009-2016