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Publisher: Elsevier   (Total: 3049 journals)

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Showing 1 - 200 of 3089 Journals sorted alphabetically
A Practical Logic of Cognitive Systems     Full-text available via subscription   (Followers: 7)
AASRI Procedia     Open Access   (Followers: 15)
Academic Pediatrics     Hybrid Journal   (Followers: 25, SJR: 1.402, h-index: 51)
Academic Radiology     Hybrid Journal   (Followers: 22, SJR: 1.008, h-index: 75)
Accident Analysis & Prevention     Partially Free   (Followers: 86, 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: 363, 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: 228, 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: 1)
Acta Poética     Open Access   (Followers: 4)
Acta Psychologica     Hybrid Journal   (Followers: 24, 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: 6)
Additive Manufacturing     Hybrid Journal   (Followers: 7, SJR: 1.039, h-index: 5)
Additives for Polymers     Full-text available via subscription   (Followers: 21)
Advanced Cement Based Materials     Full-text available via subscription   (Followers: 3)
Advanced Drug Delivery Reviews     Hybrid Journal   (Followers: 132, 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: 26, 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 Cell Aging and Gerontology     Full-text available via subscription   (Followers: 4)
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: 27, 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: 7)
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: 45, SJR: 3.25, h-index: 43)
Advances in Engineering Software     Hybrid Journal   (Followers: 26, 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: 43, SJR: 5.465, h-index: 64)
Advances in Exploration Geophysics     Full-text available via subscription   (Followers: 3)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 8)
Advances in Food and Nutrition Research     Full-text available via subscription   (Followers: 51, 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 Human Factors/Ergonomics     Full-text available via subscription   (Followers: 26)
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: 36, 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 Intl. Accounting     Full-text available via subscription   (Followers: 4)
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: 8, 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 Organ Biology     Full-text available via subscription   (Followers: 2)
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: 62)
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: 2, SJR: 0.1, h-index: 2)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 5)
Advances in Space Research     Full-text available via subscription   (Followers: 360, 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: 16)
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: 44, 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: 330, 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: 417, SJR: 1.385, h-index: 72)
Agri Gene     Hybrid Journal  
Agricultural and Forest Meteorology     Hybrid Journal   (Followers: 16, SJR: 2.18, h-index: 116)
Agricultural Systems     Hybrid Journal   (Followers: 30, SJR: 1.275, h-index: 74)
Agricultural Water Management     Hybrid Journal   (Followers: 40, SJR: 1.546, h-index: 79)
Agriculture and Agricultural Science Procedia     Open Access  
Agriculture and Natural Resources     Open Access   (Followers: 2)
Agriculture, Ecosystems & Environment     Hybrid Journal   (Followers: 55, 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: 11, 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   (Followers: 1)
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: 9, SJR: 0.158, h-index: 9)
Alzheimer's & Dementia     Hybrid Journal   (Followers: 46, SJR: 4.289, h-index: 64)
Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring     Open Access   (Followers: 4)
Alzheimer's & Dementia: Translational Research & Clinical Interventions     Open Access   (Followers: 4)
Ambulatory Pediatrics     Hybrid Journal   (Followers: 5)
American Heart J.     Hybrid Journal   (Followers: 49, SJR: 3.157, h-index: 153)
American J. of Cardiology     Hybrid Journal   (Followers: 48, SJR: 2.063, h-index: 186)
American J. of Emergency Medicine     Hybrid Journal   (Followers: 40, SJR: 0.574, h-index: 65)
American J. of Geriatric Pharmacotherapy     Full-text available via subscription   (Followers: 9, SJR: 1.091, h-index: 45)
American J. of Geriatric Psychiatry     Hybrid Journal   (Followers: 14, SJR: 1.653, h-index: 93)
American J. of Human Genetics     Hybrid Journal   (Followers: 32, SJR: 8.769, h-index: 256)
American J. of Infection Control     Hybrid Journal   (Followers: 26, 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: 46, 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: 200, SJR: 2.255, h-index: 171)
American J. of Ophthalmology     Hybrid Journal   (Followers: 59, SJR: 2.803, h-index: 148)
American J. of Ophthalmology Case Reports     Open Access   (Followers: 6)
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: 27, SJR: 2.653, h-index: 228)
American J. of Preventive Medicine     Hybrid Journal   (Followers: 25, SJR: 2.764, h-index: 154)
American J. of Surgery     Hybrid Journal   (Followers: 35, 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: 6)
Anaerobe     Hybrid Journal   (Followers: 4, SJR: 1.066, h-index: 51)
Anaesthesia & Intensive Care Medicine     Full-text available via subscription   (Followers: 58, SJR: 0.124, h-index: 9)
Anaesthesia Critical Care & Pain Medicine     Full-text available via subscription   (Followers: 12)
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: 12)
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  

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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  [3049 journals]
  • Numerical investigation of heat transfer and pressure drop of in-line
           array of heated obstacles cooled by jet impingement in cross-flow

    • Authors: Hussein M. Maghrabie; M. Attalla; H.E. Fawaz; M. Khalil
      Pages: 285 - 296
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): Hussein M. Maghrabie, M. Attalla, H.E. Fawaz, M. Khalil
      A computational study of cooling in-line array of heated obstacles simulating electronic components by jet impingement in cross-flow (JICF) has been investigated using RNG k-ε turbulence model. The jet position has been changed to impinge each obstacle consecutively at different jet-to-channel Reynolds number ratios, Re j/Re c =1, 2, and 4. The main flow structure, the static pressure, local and average Nusselt numbers as well as the thermal enhancement factor have been investigated. The results show that there is a significant variation between the flow structures around an obstacle when subjected to JICF or CF. The friction factor for JICF is greater than that for cross-flow only (CF) by 88% at the first jet position and Re j/Re c =4. The irregular distribution of local Nusselt number ( Nu ) on the impinged obstacle is moderated by increasing the Reynolds number ratios. Increasing Reynolds number ratio increases the average Nusselt number ( Nu ‾ ) of the downstream obstacles and decreases it for the upstream obstacles. The increment of Nu ‾ for whole array for JICF than CF is about 26% at JP3 and Re j/Re c =4. Moreover, the highest value of thermal enhancement factor is attained at JP3 and it equals 12% for Re j/Re c =4.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2016.12.022
       
  • Enhanced impact properties of cementitious composites reinforced with
           pultruded flax/polymeric matrix fabric

    • Authors: Magdi El-Messiry; Shaimaa El-Tarfawy; Rania El Deeb
      Pages: 297 - 307
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      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: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.03.032
       
  • Maximum output voltage and frequency of single electron tunneling inverter
           for variable temperature and load capacitance

    • Authors: Ali A. Elabd; EL-Sayed M. El-Rabaie; Abdelaziz T. Shalaby
      Pages: 309 - 312
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): Ali A. Elabd, EL-Sayed M. El-Rabaie, Abdelaziz T. Shalaby
      Studying of single electronics should consider both the temperature and the circuit capacitance as being the most important parameters that affect the behavior of SET devices. In this letter, the delay and the output voltage level in the single electron tunneling inverter are investigated for a wide range of temperature and load capacitance. Due to the stochastic nature of the electron transports in single electronics, the results are considered to be the average of many Monte Carlo computations.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.02.026
       
  • Design of clover slot antenna for biomedical applications

    • Authors: S. Ashok Kumar; T. Shanmuganantham
      Pages: 313 - 317
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): S. Ashok Kumar, T. Shanmuganantham
      A new clover slot antenna operating at 2.45GHz Industrial, Scientific, and Medical (ISM) band for biomedical applications is presented and experimentally verified. By putting a single feed and truncating clover slots with extra perturbation, good performance of polarization can be achieved. Also, the miniaturized size of the proposed antenna is 14×12×0.8mm3 by utilizing the clover shaped slots. A broader bandwidth of 2.5GHz is obtained for reflection coefficient less than −10dB. In addition, the radiation pattern of proposed antenna exhibits the maximum gain of −6dBi.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2016.08.034
       
  • Assessment of geogrids in gravel roads under cyclic loading

    • Authors: Azza Mohamed Elleboudy; Nasser Mosleh Saleh; Amany Gouda Salama
      Pages: 319 - 326
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): Azza Mohamed Elleboudy, Nasser Mosleh Saleh, Amany Gouda Salama
      Performance of geogrid in gravel roads subjected to repeated loads was investigated through laboratory testing in the laboratory of faculty of engineering at Shoubra and finite element analysis. Twenty two laboratory model tests under cyclic loading were conducted on road sections consisting of base course layer with and without geogrid reinforcement overlaying weak subgrade. Parameters investigated included base layer thickness, grid aperture size, geogrid tensile strength, number of geogrid layers, and geogrid location. The experimental results indicated that the inclusion of one geogrid sheet placed at the base of course layer reduced the vertical deformation by about 18 to 64% depending on the base course layer thickness. The vertical deformation depth increased rapidly during the initial load cycles; thereafter the rate of settlement is reduced as the number of loading cycles increased. The most effective location of geogrid was found to be in the top quarter of the base course layer. When the results of the laboratory tests were compared with the analytical solution using finite element program ABAQUS, the FE results were in good agreement with the experimental test results.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2016.09.023
       
  • Effect of drains coverings on environment by using value engineering

    • Authors: Walaa Y. El-Nashar
      Pages: 327 - 332
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): Walaa Y. El-Nashar
      Drains coverings (DC) are used to pass the small discharge to function as bridge. There are two types for coverings, pipe or box type. The main problems which lead to a perceived need to cover a drain are: to minimize the adverse impact of a polluted drain, especially close to residential areas, need to use the land area occupied by the drain for an access road or some other use, poor soil stability leading to bank failure, and to protect them from pollution. DC has many effects on the environment. The main objective of this study is using value engineering (VE) to explain the effects of DC on the environment. Life cycle cost (LCC) methodology is used also to compare between two alternatives for drains. These alternatives are (i) surface drains, (ii) drains coverings. Results show that the best alternative for the environment is drains coverings.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.05.013
       
  • Numerical investigation for heat transfer enhancement using nanofluids
           over ribbed confined one-end closed flat-plate

    • Authors: Mohamed M. Hassan; Mohamed A. Teamah; Wael M. El-Maghlany
      Pages: 333 - 343
      Abstract: Publication date: September 2017
      Source:Alexandria Engineering Journal, Volume 56, Issue 3
      Author(s): Mohamed M. Hassan, Mohamed A. Teamah, Wael M. El-Maghlany
      Impinging jet is one of various methods of cooling with the ability to achieve high heat transfer rates and improve average surface’s Nusselt number. This method has vast industrial applications including integrated use in solar collectors, gas turbine cooling, refrigeration, air conditioning and electronics cooling. A numerical study is conducted to study the effects of using nanofluids on impinging slot jet over a flat plate with a ribbed surface. The main objective of the study was to investigate the possibility of improving the overall heat transfer rate by focusing on the improvements in the local and average surface Nusselt number values. Several parameters effects are studied including Solid Volume Fraction, Richardson number and Reynolds number. These results indicated a marked improvement in average Nusselt number with the increase in the solid volume fraction. Also, there is an amended value when the buoyancy effect is dominant over the whole domain. The results are shown in the form of streamlines, isotherms and Nusselt numbers contra other variables. The current work was simulated using a FORTRAN CFD Code, which discretizes the non-dimensional forms of the governing equations utilizing the finite volume method and solving the consequent algebraic equations using Gauss-Seidel method Utilizing TDMA.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.03.051
       
  • Memorized error and varying error bound for extending adaptiveness for
           normalized subband adaptive filtering

    • Authors: B. Samuyelu; P. Rajesh Kumar
      Abstract: Publication date: Available online 9 November 2017
      Source:Alexandria Engineering Journal
      Author(s): B. Samuyelu, P. Rajesh Kumar
      This paper extends the adaptive normalized sub-band adaptive filtering (NSAF) by introducing variable error bound and memorizing the error convergence. The variable error bound attempts to vary the updating point of the filter coefficients. The error memory aids in updating the point based on the history of error rather than the previous error. The extended adaptiveness significantly improved NSAF in terms of convergence, complexity and noise robustness. The algorithm is also proved for its stability though the step-size is varied. The characteristics of the step-size are also investigated to determine its significance and nature on minimizing the error. The superiority of the MVS-SNSAF algorithm is proved against conventional algorithm using the aforesaid analysis.

      PubDate: 2017-11-11T18:50:39Z
      DOI: 10.1016/j.aej.2017.08.005
       
  • Spectral analysis of the stochastic time-fractional-KdV equation

    • Authors: Ayesha Sohail; Farid Chighoub; ZhiWu Li
      Abstract: Publication date: Available online 2 November 2017
      Source:Alexandria Engineering Journal
      Author(s): Ayesha Sohail, Farid Chighoub, ZhiWu Li
      A numerical solution of the stochastic fractional order Korteweg-de Vries equation arising in oceanography and plasma physics is approximated using a novel spectral/finite difference tool. The special case for additive time-dependent noise is discussed by taking into account both the uniform and the Gaussian random inputs. A spectral technique for space and a multi-step finite difference scheme for time are employed. Emphasis is made on the spatial spectral discretization error in conjunction with the stochastic approximation error, on the stability bounds and on the amplitude of the stochastic perturbation.

      PubDate: 2017-11-04T01:44:17Z
      DOI: 10.1016/j.aej.2017.09.013
       
  • Reduction of features to identify characters from degraded historical
           manuscripts

    • Authors: T.R. Vijaya Lakshmi
      Abstract: Publication date: Available online 31 October 2017
      Source:Alexandria Engineering Journal
      Author(s): T.R. Vijaya Lakshmi
      The historical writings were found on stones, palm leaves, cloth, etc. This paper deals with the identification of Telugu Palm leaf characters by acquiring a additional 3D feature on palm leaves. The background of these manuscripts is identical to the writings on them. Removing background from such scripts is a tedious task. This is achieved with the 3D feature depth in the current work. With the help of this 3D feature, an improved classification rate is also achieved.

      PubDate: 2017-11-04T01:44:17Z
      DOI: 10.1016/j.aej.2017.09.009
       
  • A fixed point iterative method for the solution of two-point boundary
           value problems for a second order differential equations

    • Authors: Nakone Bello; Alhaji Jibril Alkali; Abubakar Roko
      Abstract: Publication date: Available online 31 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Nakone Bello, Alhaji Jibril Alkali, Abubakar Roko
      Recently Kilicman et al. (2006) propose a variational fixed point iteration technique with the Galerkin method for the determination of the starting function for the solution of second order linear ordinary differential equation with two-point boundary value problem without proving the convergence of the method. In this paper, a fixed point iteration method similar to Mann iteration process is proposed and successfully applied to the solution of two-point boundary value problems. We use an affine function satisfying the boundary conditions as a starting approximate solution. We also show the convergence of the method and design a Maple program for the numerical computations. Examples are given to demonstrate the agreement of the results of the proposed method with that of exact solution and existing methods.

      PubDate: 2017-11-04T01:44:17Z
      DOI: 10.1016/j.aej.2017.09.010
       
  • A decision support system for Acute Leukaemia classification based on
           digital microscopic images

    • Authors: Ahmed S. Negm; Osama A. Hassan; Ahmed H. Kandil
      Abstract: Publication date: Available online 26 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Ahmed S. Negm, Osama A. Hassan, Ahmed H. Kandil
      In the era of digital microscopic imaging, Image Processing, data analysis, classification, decision support systems have emerged as one of the most important tools for diagnostic research. Physicians can observe cellular internal structures abnormalities by visualizing and analyzing images. Leukemia is a malignant disease characterized by the uncontrolled accumulation of abnormal white blood cells. The recognition of acute leukemia blast cells in colored microscopic images is a challenging task. The first important step in the automatic recognition of this disease, image segmentation, is considered to be the most critical step. In this study, we present a decision support system that includes the panel selection, segmentation using K-means clustering to identify the leukemia cells and features extraction, and image refinement. After the decision support system successfully identifies the cells and its internal structure, the cells are classified according to their morphological features of this analysis the decision support system was tested using a public dataset designed to test segmentation techniques for identifying specific cells, and the results of this analysis were compared with those of other techniques, which were suggested by other researchers, applied to the same data. The algorithm was then applied to another dataset, extracted under the supervision by an expert pathologist, from a local hospital; the total dataset consisted of 757 images gathered from two datasets. The images of the datasets are labeled with three different labels, which represents three types of leukemia cells: blast, myelocyte, and segmented cells. The process of labeling of these images was revised by the expert pathologist. The algorithm testing using this dataset demonstrated an overall accuracy of 99.517%, the sensitivity of 99.348%, and specificity of 99.529%. Therefore, this algorithm yielded promising results and warrants further research.

      PubDate: 2017-10-27T11:15:32Z
      DOI: 10.1016/j.aej.2017.08.025
       
  • Two reliable computational methods pertaining to steady state substrate
           concentration of an immobilized enzyme system

    • Authors: M. Salai Mathi Selvi; G. Hariharan; K. Kannan; M.H. Heydari
      Abstract: Publication date: Available online 23 October 2017
      Source:Alexandria Engineering Journal
      Author(s): M. Salai Mathi Selvi, G. Hariharan, K. Kannan, M.H. Heydari
      A mathematical model of an immobilized enzyme system with Michaelis-Menten mechanism for an irreversible reaction is discussed. The model is developed on the basis of diffusion equations containing a nonlinear term related to Michaelis-Menten (M-M) kinetics. In this paper, Legendre wavelets operational matrix of derivatives are used to solve the nonlinear reaction-diffusion equations. The concentration profile of substrate is computed for various parameter values. Also the dimensionless concentration of substrate is established for the slab, cylinder and spherical pallets in different cases. An approximate/analytical expression for substrate concentration is obtained as a function of the Thiele modulus and the Michaelis constant. The proposed wavelet solutions are compared with Adomian decomposition method (ADM) and numerical solutions. Satisfactory agreement with ADM and numerical is observed for all Thiele modulus and M-M constants. Power of the proposed methods is confirmed.

      PubDate: 2017-10-27T11:15:32Z
      DOI: 10.1016/j.aej.2017.09.012
       
  • Composite power system reliability evaluation using modified minimal cut
           set approach

    • Authors: T. Bharath Kumar; O. Chandra Sekhar; M. Ramamoorty
      Abstract: Publication date: Available online 21 October 2017
      Source:Alexandria Engineering Journal
      Author(s): T. Bharath Kumar, O. Chandra Sekhar, M. Ramamoorty
      The composite power system reliability analysis is generally based on minimal path or cut enumeration, tracing of power flow paths from which the related reliability indices are calculated. The minimal cut set is a popular method in the reliability analysis for simple and complex configurations. Average availability of power supply at the consumer end is one of the reliability assessment parameter. This paper is concerned about the evaluation of this reliability index. A step by step procedure for a modified minimal cut set method is explained in this paper using IEEE 6 bus, 14 bus and Single area IEEE RTS 96 system. The proposed algorithm is easy to program and can be applicable to any system. The proposed algorithm is validated with the Classical Node Elimination method, Step by Step algorithm using Conditional Probability and Monte Carlo Simulation method. The proposed technique is tested with a practical example taken from Roy Billinton paper (Reliability evaluation in distribution and transmission systems).

      PubDate: 2017-10-27T11:15:32Z
      DOI: 10.1016/j.aej.2017.09.008
       
  • Routing protocols source of self-similarity on a wireless network

    • Authors: Danladi Ali; Michael Yohanna; W.N. Silikwa
      Abstract: Publication date: Available online 21 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Danladi Ali, Michael Yohanna, W.N. Silikwa
      In this work, a model of a MANET has been developed, performance of different routing protocols (DSR, GRP and OLSR) have been analyzed in terms of bandwidth utilization, delay, media access delay, packet retransmission, traffic sent and received and self-similar nature of the network traffic is also examined. The results of the analysis showed that OLSR and GRP have better performance on a larger wireless networks than DSR. In additional, routing protocols and increasing the number of network users (mobile stations) does not induce self – similar properties on a wireless network and it is found that, OLSR is the best for large wireless networks.

      PubDate: 2017-10-27T11:15:32Z
      DOI: 10.1016/j.aej.2017.08.013
       
  • A sparse representation based image steganography using Particle Swarm
           Optimization and wavelet transform

    • Authors: S.I. Nipanikar; V. Hima Deepthi; Nikita Kulkarni
      Abstract: Publication date: Available online 17 October 2017
      Source:Alexandria Engineering Journal
      Author(s): S.I. Nipanikar, V. Hima Deepthi, Nikita Kulkarni
      With the growth of information technology, information security is a major concern in the interactive environment, where there is no security for the messages send to and from the receiver. A technology named image steganography has been employed that ensures security to the covert communication and safeguarding the information. Image steganography hides the secret message in any of the recipient images and sends the secret message such that the message is visible only to the sender and the receiver. This paper proposes a method for image steganography using sparse representation, and an algorithm named Particle Swarm Optimization (PSO) algorithm for effective selection of the pixels for the purpose of embedding the secret audio signal in the image. PSO-based pixel selection procedure uses a fitness function that depends on the cost function. Cost function calculates the edge, entropy, and intensity of the pixel for evaluating fitness. Simulation has been done and comparison of the PSO with the other existing methods in terms of Peak-Signal-to-Noise-Ratio (PSNR) and Mean Square Error (MSE) determines the proposed PSO, as an effective method. The proposed method achieved a better PSNR and MSE values of 47.6 dB and 0.75 respectively.

      PubDate: 2017-10-20T03:42:41Z
      DOI: 10.1016/j.aej.2017.09.005
       
  • Optimization of multi objective vehicle routing problem using a new hybrid
           algorithm based on particle swarm optimization and artificial bee colony
           algorithm considering Precedence constraints

    • Authors: Davoud Sedighizadeh; Houman Mazaheripour
      Abstract: Publication date: Available online 16 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Davoud Sedighizadeh, Houman Mazaheripour
      The vehicle routing problem is the basic problem of distribution planning which seeks to find the best route with minimum displacement cost considering the number of customers, their constraints, and number and capacity of the available vehicles. In this study, the traveling salesman problem and vehicle routing models are firstly described and, after that, the multi objective vehicle routing model is proposed to consider the Precedence constraints among customers. There are different meta-heuristic algorithms that can solve such NP-hard problems. In the present study, a solver algorithm is proposed which is based on a combination of the particle swarm optimization and the artificial bee colony algorithms. Additionally, by presenting an operational sample, using data of customers in a region, considering different constraints of the problem and its functions, and using penalty method as well as additional segmentation constraint method, the best vehicle route is obtained and the results of each algorithm together with its hybrid algorithm are demonstrated.

      PubDate: 2017-10-20T03:42:41Z
      DOI: 10.1016/j.aej.2017.09.006
       
  • Solving weakly singular integral equations utilizing the meshless local
           discrete collocation technique

    • Authors: Pouria Assari
      Abstract: Publication date: Available online 13 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Pouria Assari
      The current work presents a computational scheme to solve weakly singular integral equations of the second kind. The discrete collocation method in addition to the moving least squares (MLS) technique established on scattered points is utilized to estimate the solution of integral equations. The MLS scheme approximates a function without mesh refinement over the domain that includes a locally weighted least squares polynomial fitting. The discrete collocation technique for the approximate solution of integral equations results from the numerical integration of all integrals in the method. We utilize an accurate quadrature formula based on the use of non-uniform composite Gauss-Legendre integration rule and employ it to compute the singular integrals appeared in the approach. The proposed scheme does not require any meshes, so it can be called as the meshless local discrete collocation (MLDC) method. Error analysis is also given for the method. Illustrative examples are shown clearly the reliability and efficiency of the new scheme and confirm the theoretical error estimates.

      PubDate: 2017-10-20T03:42:41Z
      DOI: 10.1016/j.aej.2017.09.015
       
  • Study of combustion behaviors for dimethyl ether asan alternative fuel
           using CFD with detailed chemical kinetics

    • Authors: Hagar Alm El-Din; Medhat Elkelawy; Abd Elnaby Kabeel
      Abstract: Publication date: Available online 12 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Hagar Alm El-Din, Medhat Elkelawy, Abd Elnaby Kabeel
      In the present analysis, the dissemination of dimethyl ether (DME) asan alternative fuel with the charged air inside the HCCI engine chamber until accomplishing the burning procedure have been numerically expected by utilizing CFD with detailed chemical kinetics mechanism. The physical technique of the ignition and pollution arrangement in the engine barrel with DME fuel is examined with a developed hydrocarbon reaction mechanism at various HCCI engine loads. The mechanism is including 81 chemical species and 362 basic chemical reactions. Along these lines, the used CFD/discipline code predicts the admittance of the fuel spray, ignition, and pollutant development of DME asa biodiesel fuel. The split injection technique has been used to inject the dimethyl ether remotely at the engine admission tube. The in-cylinder flow field enhances farther the engine chamber fuel/air distribution. The outcomes showed that the blend of DME fuel with charged air is exact and efficient to accomplish the in-barrel blend homogeneity. It is anticipated that, under every engine working condition the production of the methyl radical is considered as imperative part in dimethyl ether pyrolysis and oxidation. In the meantime, the formaldehyde sub-component is a huge division of the general dimethyl ether (DME) ignition system.

      PubDate: 2017-10-13T17:34:07Z
      DOI: 10.1016/j.aej.2017.08.012
       
  • Augmentation of a solar still distillate yield via absorber plate coated
           with black nanoparticles

    • Authors: A.E. Kabeel; Z.M. Omara; F.A. Essa; A.S. Abdullah; T. Arunkumar; Ravishankar Sathyamurthy
      Abstract: Publication date: Available online 12 October 2017
      Source:Alexandria Engineering Journal
      Author(s): A.E. Kabeel, Z.M. Omara, F.A. Essa, A.S. Abdullah, T. Arunkumar, Ravishankar Sathyamurthy
      Effects of utilizing nanomaterial on the solar still productivity investigated experimentally. Cuprous oxides (CuO) chosen asa nanoparticles material. The nanoparticles added to the black paint of the solar still walls to enhance the solar still performance. Experiments conducted with cuprous oxide nanoparticles weight concentrations ranged from 10% to 40%. It is found that adding nanoparticles to paint increase heat transfer rate and saline water temperature. Solar still productivity of the proposed system is higher than that for the conventional still. Results acquired that utilizing CuO nanoparticles boosted the distillate by 16% and 25% as compared to the conventional solar still (CSS) at weight fraction concentration of 10% and 40%, respectively. Payback period of the distillation system for the modified still using CuO nanomaterials is about 96days, at weight fraction 10%, which is considerable as compared by 89days for CSS.

      PubDate: 2017-10-13T17:34:07Z
      DOI: 10.1016/j.aej.2017.08.014
       
  • Design and development of compact microstrip patch dual band antenna for
           wireless applications

    • Authors: R. Nagendra; T. Venkateswarulu
      Abstract: Publication date: Available online 9 October 2017
      Source:Alexandria Engineering Journal
      Author(s): R. Nagendra, T. Venkateswarulu
      In this paper, a novel dual band microstrip patch antenna based on composite patch antenna and radiating part. By selecting a suitable offset feed position, it is feasible to provide 50 Ω characteristic impedance and thus making better impedance matching. The proposed antenna has been improved broader bandwidth by using RT Duroid substrate. The radiating part is plays a important role in creating a lower operating band (2.45 GHz) in addition to achieve miniaturization. The proposed antenna has to be fabricated with RT/Duroid substrate and dimensions of 19×22×0.8 mm. The measured −10 dB bandwidth of 200 MHz at 3.45 GHz and 990 MHz at 5.45 GHz, which is quite useful for Industrial, Scientific and Medical (ISM) and WLAN applications.

      PubDate: 2017-10-13T17:34:07Z
      DOI: 10.1016/j.aej.2017.09.014
       
  • From Informal Settlements to sustainable communities

    • Authors: Dina Mamdouh; Nassar Hanan Gamil Elsayed
      Abstract: Publication date: Available online 4 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Dina Mamdouh Nassar, Hanan Gamil Elsayed
      Informal Settlements and urban informality is a serious and common problem in Third World countries. These settlements are not marginal actors in the real estate market. They play an important role affecting greatly the housing supply and demand market. In Egypt, Informal Settlements emerged in and around big cities since the sixties of the twentieth century, due to natural growth and the flux of rural-urban migration. Alexandria- as the second biggest city in Egypt after Cairo- is witnessing a rapid population increase, therefore monitoring Informal Settlements locations, expansion and growth is important for possible urban development. This study focuses on the continued transformation of Alexandria’s backdrop productive agricultural land into Informal Settlements causing serious encroachment on agricultural land. The study intends to find solutions through examining local needs and potentials for a selected case study named “Houd 10”. This case is an example that sheds the light on means that can be utilized in Informal Settlements to improve living conditions and reach socio-economic potentials. Analyses of the current situation and challenges at Houd 10 are examined on three levels; economic, social and environmental. The research also highlights the role of non-profit organizations and social participation for developing such areas.

      PubDate: 2017-10-06T11:25:49Z
       
  • The effect of energy prices on energy consumption efficiency in the
           petrochemical industry in Iran

    • Authors: Jaber Valizadeh; Ehsan Sadeh; Habibollah Javanmard; Hanieh Davodi
      Abstract: Publication date: Available online 3 October 2017
      Source:Alexandria Engineering Journal
      Author(s): Jaber Valizadeh, Ehsan Sadeh, Habibollah Javanmard, Hanieh Davodi
      The main purpose of this study is to analyze the effect of energy prices on consumption energy consumption efficiency in the petrochemical industry in Iran during the period 1994–2012. Also, in order to avoid the bias (bias, error) omitted variables, a number of determinants of energy consumption efficiency, i.e. the ratio of workforce to energy, the ratio of capital to total energy consumption, the price of labor, cost of capital and technology are used within the framework of an econometric model. For this purpose, based on the Cobb-Douglas production function, extended average energy consumption efficiency in the petrochemical industry is measured. Then, using the approach ARDL (Autoregressive Distributed Lag Model), the effect of explanatory variables on the dependent variable has been analyzed. The results show that energy consumption efficiency index in the petrochemical industry of Iran has a long-term trend growing; however, this index has been relatively high volatility. In addition, according to the findings, energy prices had a significant and positive effect on energy consumption efficiency. Also, the ratio of workforce to total energy consumption, the ratio of capital to total energy consumption and the price of capital and technology have a significant and positive effect on total energy consumption efficiency in the petrochemical industry.

      PubDate: 2017-10-06T11:25:49Z
      DOI: 10.1016/j.aej.2017.09.002
       
  • Numerical solution of MHD slip flow of a nanofluid past a radiating plate
           with Newtonian heating: A Lie group approach

    • Authors: M.J. Uddin; A. Sohail; O. Anwar Bég; A.I.Md. Ismail
      Abstract: Publication date: Available online 29 September 2017
      Source:Alexandria Engineering Journal
      Author(s): M.J. Uddin, A. Sohail, O. Anwar Bég, A.I.Md. Ismail
      In this paper, we have examined the magnetohydrodynamic flow of a nanofluid past a radiating sheet. The Navier velocity slip, Newtonian heating and passively controlled wall boundary conditions are considered. The governing equations are reduced into similarity equations with the help of Lie group. A collocation method is used for simulation. The influence of emerging parameters on velocity, temperature, nanoparticle volumetric fraction profiles, as well as on local skin friction factor and local Nusselt number is illustrated in detail. It is found that the friction (heat transfer rate) is lower (higher) for passively controlled boundary conditions as compared to the case of an actively controlled boundary condition. The magnetic field effects decrease both the skin friction and the rate of heat transfer. The findings are validated with existing results and found an excellent agreement. The model explores new applications in solar collectors with direct solar radiative input using magnetic nanofluids.

      PubDate: 2017-10-06T11:25:49Z
      DOI: 10.1016/j.aej.2017.03.025
       
  • Experimental study on combustion and performance characteristics in a DI
           CI engine fuelled with blends of waste plastic oil

    • Authors: Hariram Venkatesan; Seralathan Sivamani; Kunal Bhutoria; Harsh H. Vora
      Abstract: Publication date: Available online 28 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Hariram Venkatesan, Seralathan Sivamani, Kunal Bhutoria, Harsh H. Vora
      Recycling of waste plastic had gained greater importance in today’s world. The present experimental investigation deals with the transformation of waste plastics from civic landfills to oil in a pyrolysis reactor. A single feed at rate of 8kg yielded 675ml of pyrolytic oil. The physio-chemical properties of plastic oil was found to be within ASTM standards with higher kinematic viscosity and carbon residue. Straight diesel-Plastic Oil (PO) blending was carried out at 15% (diesel 85% and plastic oil 15%) and 30% (diesel 70% and plastic oil 30%) in volume ratio. Combustion analysis and performance studies was carried out at no load and full load condition in single cylinder direct injection compression ignition engine to understand the feasibility of utilizing plastic oil as substitute fuel to commercial diesel. At full load condition, in-cylinder pressure, rate of pressure rise, rate of heat release and peak pressure were higher for PO30% than straight diesel. The brake thermal efficiency for PO blends was found to be slightly higher than straight diesel with significant increase in brake specific fuel consumption. The combustion and performance characteristics of the engine was affected significantly by the physio-chemical properties of PO.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.09.001
       
  • Performance enhancement of magnetic levitation system using teaching
           learning based optimization

    • Authors: Shekhar Yadav; Santosh Kumar Verma; Shyam Krishna Nagar
      Abstract: Publication date: Available online 25 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Shekhar Yadav, Santosh Kumar Verma, Shyam Krishna Nagar
      This paper demonstrates the potency of evolution based optimization techniques in the sense of enhancing the system’s performance. Teaching Learning Based Optimization (TLBO) is a well-known evolutionary algorithm used to optimize the parameters of the PID controller so as to improve the performance of the magnetic levitation system. The TLBO search algorithm is split into two phases, the teacher phase and the learner phase. The teacher phase is comprised of having minimum performance index as compared to learner phase. The learners improve their knowledge on the basis of teacher’s performance. The parameters are tuned while minimizing the performance index of the system. The performance index incorporated in this paper is the integral time weighted square error (ITSE). The corroboration of the above technique is ended by comparing it with the conventional control techniques.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.08.016
       
  • Analysis of structural damage on the struck ship under side collision
           scenario

    • Authors: Aditya Rio; Prabowo Dong Myung Bae Jung Min Sohn Ahmad
      Abstract: Publication date: Available online 24 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Aditya Rio Prabowo, Dong Myung Bae, Jung Min Sohn, Ahmad Fauzan Zakki, Bo Cao, Qing Wang
      The occurrence of impact needs to be predicted for various cases as it mostly delivers negative to target object and environment. In marine structure, this phenomenon has distributed numerous damages to involved objects, such as can be found in tragedy of the Estonia in 1994. This disaster led to a reassessment of the safety of passenger ships in many country. During impact both of structural and material aspects contributes to responses in form of energy, force, and damage. In present work, consideration of the both aspects would be considered in preparation, analysis, and discussion, to evaluate contribution of considered aspects on failure characteristic. A target subjected to impact load in form of collision so called struck ship which had different hull configuration would be used in analysis as structural behaviour during and after hull structure of the struck ship was penetrated by the striking ship would be observed. In material level, analyses were conducted with applying different mechanical properties on the side structure. The results indicated that the tearing of inner hull was avoided due to size of double hull structure. This condition provided better safety but lower ship capacity. In other hand, strength characteristic of material was proofed dominate difference of internal energy. Finally, the influences of material strength, failure strain, and hardening parameter were evaluated and summarized.

      PubDate: 2017-09-28T19:15:02Z
       
  • Performance test of a sea water multi-stage flash distillation plant: Case
           study

    • Authors: A.M.K. El-Ghonemy
      Abstract: Publication date: Available online 23 September 2017
      Source:Alexandria Engineering Journal
      Author(s): A.M.K. El-Ghonemy
      Multi-Stage-Flash (MSF) Distillation is a large scale sea water desalination plants that are widely used in Gulf area. Most installations of MSF plants are operated in cogeneration with a power plant. Also, MSF plants can be combined with other desalination technologies such as Nano filtration and Reverse osmosis (RO) in new installation. However, the new MSF plants are recommended, where large amounts of cheap or waste energy are available (e.g. conventional power plants). Also, the plant location is playing an important role for economic operation due to cold or hot weather conditions. The present study is applied on the seawater multi-stage flash (MSF) desalination plant that is currently under operation in Al-Khafji operations plant located in Saudi Arabia (KSA). The plant contains 20 evaporator stages at capacity of 600,000 gallon per day (GPD). The presented operating data has been collected during a visit of the plant. Theobjectiveis to presentfieldresults of this MSF plant operation in order to measure and evaluate the performance at 70% and 100% capacity during summer (case-1) and winter (case-2) operation. Then, the plant overall performance indicators are presented to compare between the studied two cases in terms of specific cooling water flowrates and performance ratio. Finally, the seasonal performance variation of the plant is included. The results showed that, for the same plant output, the main cooling water flow rates is decreased from 47.1% to 20.1% for case-1 and case-2 respectively, which in turns directly reduces the pumping power by the same ratio. Consequently, running the large scale thermal desalination MSF plant in cold regions is more economic than hot regions for pumping power energy saving considerations. This is to be considered in future large scale desalination plants.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.08.019
       
  • An impact of ethyl esters of groundnut acid oil (vegetable oil refinery
           waste) used as emerging fuel in DI diesel engine

    • Authors: P. Deivajothi; V. Manieniyan; S. Sivaprakasam
      Abstract: Publication date: Available online 23 September 2017
      Source:Alexandria Engineering Journal
      Author(s): P. Deivajothi, V. Manieniyan, S. Sivaprakasam
      The major diesel consumption is in the field of automobile, industry and agriculture. The increasing the petroleum cost also increasing the other consumable cost, it affects the economics of growing country like India. Biodiesel is considered asa promising alternative to fossil fuels worldwide. The oils selected for the study are groundnut acid oil from vegetable oil refinery industrial waste. The oil is converted into their ethyl esters by the transesterification process. Ethyl Esters of Ground Nut Acid Oil (EEGAO) and their blends (B20EEGAO, B40 EEGAO, B60EEGAO and B80EEGAO) each with diesel have been evaluated in the present investigation for single cylinder DI diesel engine. The speed of the test engine was maintained at 1500rpm in entire experiment and speed to be controlled by governor is used to control. The results obtained performance parameters slightly reduce when the engine operated with all EEGAO blend. B20EEGAO blends reduce the emission compare to all other blends and diesel.

      PubDate: 2017-09-28T19:15:02Z
      DOI: 10.1016/j.aej.2017.09.003
       
  • Boundary layer analysis of persistent moving horizontal needle in
           magnetohydrodynamic ferrofluid: A numerical study

    • Authors: C. Sulochana; G.P. Ashwinkumar; N. Sandeep
      Abstract: Publication date: Available online 19 September 2017
      Source:Alexandria Engineering Journal
      Author(s): C. Sulochana, G.P. Ashwinkumar, N. Sandeep
      The boundary layer analysis of a 2D forced convection flow along a persistent moving horizontal needle in electrically conducting magnetohydrodynamic dissipative ferrofluid is investigated. The energy equation is constructed with the Joule heating, variable heat source/sink and dissipation effects. To check the variation in the boundary layer behaviour, we considered the two ferrofluids namely, Fe3O4-methanol and Fe3O4-water. The reduced system of governing PDEs are solved by employing the R-K process. Computational results of the flow and energy transport are interpreted with the assistance of tabular and graphical illustrations. Increasing the needle size significantly reduces the flow and thermal fields of both nanofluids. In particular, thermal and velocity fields of Fe3O4-methanol nanofluid is highly depreciated when equated with the Fe3O4-water nanofluid.

      PubDate: 2017-09-21T23:11:01Z
      DOI: 10.1016/j.aej.2017.08.020
       
  • Utilization of tail-escape weir for water conservation in distributary
           canals

    • Authors: Mohamed Reyad; Mohamed Elkholy; Farouk El-Fitiany
      Abstract: Publication date: Available online 18 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Mohamed Reyad, Mohamed Elkholy, Farouk El-Fitiany
      Egypt is facing an increasing problem of water deficit for irrigation and other uses. Most of the Egyptian distributary irrigation canals are operated using the rotational system where water is discharged continuously during irrigation period. However, farmers rarely irrigate during night hours and a significant amount of water is lost to drains. A strategy to reduce these water losses may be adopted by suggesting better operational abstraction patterns from off-takes that are distributed along the canal and by changing the tail-escape weir heights. An unsteady-flow model is developed to study the effects of different canal parameters: weir height, canal length and slope and off-takes abstraction time on the amount of water losses. It is found that water losses are significantly affected by the weir height and the abstraction time at the off-takes. Longer and milder canals provide more storage thus reducing water losses. Adequacy indicator for water supply considerably improves for longer abstraction time. A non-prismatic and deteriorated canal is investigated and results shows that deterioration of the canal cross-sections creates an additional storage and reduces water losses. However, deterioration has negative side effects in reducing canal conveyance and lowering water levels.

      PubDate: 2017-09-21T23:11:01Z
      DOI: 10.1016/j.aej.2017.06.018
       
  • Flow characteristics in low-speed wind tunnel contractions: Simulation and
           testing

    • Authors: E.-S. Zanoun
      Abstract: Publication date: Available online 18 September 2017
      Source:Alexandria Engineering Journal
      Author(s): E.-S. Zanoun
      A numerical and experimental study was conducted to characterize flow through low-speed wind tunnel contractions. The simulations were carried out using an incompressible, two-dimensional flow solver based on finite volume scheme, predicting flow along the core, and at immediate vicinity of the wall of three pre-selected wall-shape contractions. The numerical results have been validated against experimental data obtained, utilizing laser-Doppler anemometer (LDA). Particular attentions have been given to the bulk flow velocity, the centerline mean velocity, the centerline velocity fluctuations, the uniformity of the mean velocity distribution at contraction’s exit, and to the mean pressure coefficient. The experimentally determined mean-pressure coefficient values along the centerline and at contraction exit were found to be similar to those predicted numerically. The fifth-order polynomial contraction showed, however, good flow characteristics at the exit plane with small non-uniformity when compared to both the two-cubic arcs and the Witoszynski second-order polynomial contractions. It was therefore adopted for the Cottbus Large pipe (CoLaPipe) facility at the Department of Aerodynamics and Fluid Mechanics (LAS), BTU-Cottbus-Sefftenberg.

      PubDate: 2017-09-21T23:11:01Z
      DOI: 10.1016/j.aej.2017.08.024
       
  • MHD free convection flow in a vertical slit micro-channel with
           super-hydrophobic slip and temperature jump: Heating by constant wall
           temperature

    • Authors: Basant K. Jha; Bello J. Gwandu
      Abstract: Publication date: Available online 18 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Basant K. Jha, Bello J. Gwandu
      This work treats convective heat transfer, for an incompressible electrically-conducting fluid, moving vertically through an isothermally heated parallel plate micro-channel, within a transverse magnetic field. One surface exhibited super-hydrophobic slip and temperature jump, while the other did not. The study aimed at discovering the possible effects of magnetism on the velocity, volume flow rate and Nusselt Number when either wall is heated by constant wall temperature. It was noted that it reduces velocity and flow rate in both cases. It, also, leads to decline in Nusselt Number when the super-hydrophobic side is heated, while heating the other plate showed a negligible magnetic effect, for low temperature jump coefficients. At the critical value of the temperature jump coefficient, γ , the flow rates in both cases are equal. Before the critical value ( γ crit . ) is reached, heating the super-hydrophobic plate yields higher flow rate. After passing it, the reverse is the case. The effect of magnetism on γ crit . was, also, negative. The study will have applications in the design and maintenance of both mini- and micro-devices as well as in nano-science and nano-technology.

      PubDate: 2017-09-21T23:11:01Z
      DOI: 10.1016/j.aej.2017.08.022
       
  • Architecture of mosques and Islamic centers in Non-Muslim context

    • Authors: Engy Farrag
      Abstract: Publication date: Available online 14 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Engy Farrag
      Islam is the fastest growing religion in the world. The Muslim population increases as Islam spreads around the world, which leads to an increasing demand for Islamic buildings such as mosques and Islamic centres. Mosques play an important role in Islam and Muslim life. In several countries, in particular, the Western mosques are seen asa newcomer whose building type is both unique and foreign to local people who are unaccustomed to the visual expression of Islam in the West. The mosque is one of the most visual expressions of global Muslim religious identity in non-Muslim context. The significant numbers of countries have a lot of different architecture styles of their Islamic buildings. Each mosque has its own individual touch. The most important factors behind this variation in form and styles can be divided into nature impacts as (local materials and environment), followed by man-made impacts by (Muslim immigrants, colonialism, funding, and laws, culture, and traditions). The study aims to examine each factor and their influences on the architecture of mosques and Islamic centers in non-Muslim context through analysis and a comparison of a number of examples.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.001
       
  • Free convection flows over a vertical plate that applies shear stress to a
           fractional viscous fluid

    • Authors: Nehad Ali Shah; Azhar Ali Zafar; Constantin Fetecau
      Abstract: Publication date: Available online 14 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Nehad Ali Shah, Azhar Ali Zafar, Constantin Fetecau
      Free convection flow of a fractional viscous fluid over an infinite vertical plate with exponential heating is studied using a fractional derivative with non-singular kernel. Fluid motion is induced by the plate that applies an arbitrary time-dependent shear stress to the fluid. Closed-form solutions for the dimensionless velocity and temperature fields and Nusselt number are established under the usual Boussinesq approximation. The obtained results can generate exact solutions for any motion with technical relevance of this type. Moreover, fluid’s velocity is presented as a sum of its mechanical and thermal components. A semi analytical solution based on the Stehfest’s formula for the inverse Laplace transform is also obtained. Finally, the influence of fractional parameter on the fluid motion as well as the contributions of mechanical and thermal components of velocity are graphically underlined and discussed.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.023
       
  • Numerical exploration of a non-Newtonian Carreau fluid flow driven by
           catalytic surface reactions on an upper horizontal surface of a paraboloid
           of revolution, buoyancy and stretching at the free stream

    • Authors: I.L. Animasaun; I. Pop
      Abstract: Publication date: Available online 14 September 2017
      Source:Alexandria Engineering Journal
      Author(s): I.L. Animasaun, I. Pop
      Geometrically, the upper pointed surface of an aircraft and bonnet of a car are examples of upper horizontal surfaces of a paraboloid of revolution (uhspr). The motion of these objects strongly depends on the boundary layer that is formed within the immediate space on it. However, each of these surfaces is neither a horizontal/vertical nor cone/wedge and neither a cone nor a wedge. This article presents the motion of 2-dimensional Blasius flow of Carreau fluid on the surface of such object. The case in which the reaction between the Carreau fluid and catalyst at the surface produces significant temperature differences which consequently set up buoyancy-driven flows within the boundary layer is investigated. Single first-order Arrhenius kinetics is adopted to model the reaction on the surface of the catalyst situated on uhspr which initiates the free convection. Suitable similarity variables are applied to non-dimensionalized, parameterized and reduce the governing partial differential equations to a coupled ordinary differential equations (BVP). The BVP is solved numerically using the shooting technique. Temperature distribution in the flow of viscoelastic Carreau fluid is greater than that of a Newtonian fluid. Local heat transfer rate decreases faster when the Carreau fluid is characterized as shear-thinning. Maximum concentration is guaranteed at a small value of power-law index n and large value of thickness parameter.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.07.005
       
  • Revolving flow of a fluid-particle suspension with suction

    • Authors: Muhammad Rahman; Helge I. Andersson
      Abstract: Publication date: Available online 14 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Muhammad Rahman, Helge I. Andersson
      The three-dimensional revolving flow of a particle-fluid suspension above a plane surface is considered. The flow represents an extension of the classical Bödewadt flow to a two-fluid problem. The governing equations for the two phases are coupled through an interaction force with the particle relaxation time τ as a free parameter. By means of a similarity transformation, the coupled set of non-linear ODEs becomes a two-point boundary value problem. The numerical results show that the radial inward particle velocity increases whereas the circumferential velocity decreases by shortening τ , thereby strengthening the spiralling particle motion. These predictions are consistent with the so-called tea-cup effect, i.e. accumulation of tea leaves at the centre of the cup. On the contrary, the revolving fluid motion is reduced as a result of the particle-fluid interactions.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.017
       
  • Study of different parameters estimation methods of Weibull distribution
           to determine wind power density using ground based Doppler SODAR
           instrument

    • Authors: Prem Kumar Chaurasiya; Siraj Ahmed; Vilas Warudkar
      Abstract: Publication date: Available online 13 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Prem Kumar Chaurasiya, Siraj Ahmed, Vilas Warudkar
      The effectiveness of nine different numerical methods is examined for calculating the parameters of Weibull distribution at three different heights 80m, 100m and 120m to estimate wind power density. The measurement campaign was conducted at Kayathar, Tamil Nadu, India. The time series wind data were recorded using SecondWind Triton SODAR (Sound Detection and Ranging) instrument. Firstly, the fidelity assessment of SODAR measurement was examined. The aim of this study is to identify the more accurate method for computing wind power density of a selected region. The performance of the selected methods is judged based on goodness of fit test i.e. Root Mean Square Error Test (RMSE), Coefficient of Determination (R2), Mean Absolute Percentage Error (MAPE), and Chi-square Test (X2). Wind power densities are estimated with the help of estimated parameter values. This study proposes an approach to utilize SODAR and also aims to examine the accuracy of SODAR measurement by comparing the results with cup anemometer, in an attempt to establish adequate criteria for an effective utilization of SODAR for wind resource assessment. The results suggest that SODAR may be used asan alternative to meteorological mast.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.008
       
  • Swelling soils treatment using lime and sea water for roads construction

    • Authors: Dina A. Emarah; Safwat A. Seleem
      Abstract: Publication date: Available online 12 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Dina A. Emarah, Safwat A. Seleem
      The cyclic heave and settlement of expansive soils could be the main reason to considerable damages to the structures, roads and highways. In Egypt there are many regions containing such expansive soils especially at the desert lands. The remote areas are used now for establishing many projects such as (wind farms, solar plants, irrigation projects and nuclear power plants). The use of a mixture of lime-treated swelling soil mixed with potable water to overcome the swelling potential of these soils is available in many countries especially in U.S.A. For the projects located adjacent to the coasts of Sea, the sea water is available instead of potable water. This paper presents an experimental and field case study on the lime-treated soil but mixed with sea water instead of potable water. The effect of using sea water instead of potable water on the swelling behavior, engineering properties, and the consolidation parameters were studied. On the other hand, this research deals with the behavior of the lime-treated soil in swelling state as well as in consolidation state. Tests results showed that there are significant reductions in the swelling potential, engineering properties, and the consolidation parameters in case of using sea water instead of potable water as mixing water. The environmental and economic impact gained from such process was put into consideration.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.009
       
  • Parametric enhancement of a novel microstrip patch antenna using Circular
           SRR Loaded Fractal Geometry

    • Authors: Deepanshu Kaushal; T. Shanmuganantham
      Abstract: Publication date: Available online 12 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Deepanshu Kaushal, T. Shanmuganantham
      The improvement in the performance of a novel microstrip patch antenna through added stages of a fractal geometry and a circular split ring resonator for multiband operation is presented. In its first stage, a coaxial-fed novel shaped patch is developed over a 60mm×60mm×1.6mmFR4 epoxy substrate. The modification of the basic patch structure into a fractal geometry results into the addition of bands along with the parametric enhancement of reflection coefficient, gain and bandwidth. A further stamping of Circular Split Ring Resonator on reverse side of the substrate would result in significantly improved performance. The validation of the simulated results has been done and the measured set of data has been plotted against the simulated results graphically.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.021
       
  • Asymmetric cascaded half-bridge multilevel inverter without polarity
           changer

    • Authors: Mahrous Ahmed; Ahmed Sheir; Mohamed Orabi
      Abstract: Publication date: Available online 12 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Mahrous Ahmed, Ahmed Sheir, Mohamed Orabi
      In this paper, New asymmetric cascaded half H bridge multilevel inverter MLI is proposed. It is driven from the conventional asymmetric cascaded half H Bridge multilevel inverter. Thus, the proposed topology inherits its simplicity, flexibility and modularity in both construction and control. By proper choice of the input DC sources values and interconnection, proposed topology can eliminate the need for polarity generation circuit which normally associated with the cascaded half H-bridge. Therefore, reduces number of switches that require high blocking voltage. The selective harmonic elimination SHE method is applied to generate switching pattern to eliminate harmonics inherently associated with MLI. The proposed topology switching pattern naturally reduces component’s voltage stress, switching losses and finally decrees MLI size and cost. Mathematical expressions and analysis have been driven as well as comparison with other topologies. The validity of the proposed topology is verified with Matlab/Simulink model and then a prototype is built and experimental results are presented.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.018
       
  • Experimental study on an IC engine in-cylinder flow using different
           steady-state flow benches

    • Authors: M. El-Adawy; M.R. Heikal; A. Rashid A. Aziz; M.I. Siddiqui; Hasanain A. Abdul Wahhab
      Abstract: Publication date: Available online 12 September 2017
      Source:Alexandria Engineering Journal
      Author(s): M. El-Adawy, M.R. Heikal, A. Rashid A. Aziz, M.I. Siddiqui, Hasanain A. Abdul Wahhab
      In-cylinder air flow structures are known to strongly impact on the performance and combustion of internal combustion engines (ICE). Therefore the aim of this paper is to experimentally study an IC engine in-cylinder flow under steady-state conditions. Different methods can be used to characterize the in-cylinder flow which are optical engines and laser diagnostics, computational fluid dynamic and steady-state flow bench. Here we are concentrating on two different types of flow benches. The first (Ricardo) uses the impulse torque meter method while the other (FEV) uses the paddle wheel technique. The experiments were carried out on the same cylinder head and the same pressure difference across the inlet valves of 600mmH2O in order to compare the results. The experimental results are presented in terms of the measured air flow rate, flow coefficient, discharge coefficient and non-dimensional rig tumble. Moreover, number of modifications were conducted on the FEV flow bench in order to apply particle image velocimetry measurements on the vertical tumble plane, which passing through the middle of the cylinder at different valve lifts. The results show that a reasonably good level of agreement can be achieved between both methods, providing the methods of calculations of the various parameters are consistent.

      PubDate: 2017-09-16T17:13:23Z
      DOI: 10.1016/j.aej.2017.08.015
       
  • Study of heat and mass transfer on MHD Walters B′ nanofluid flow induced
           by a stretching porous surface

    • Authors: S.R. Mishra; S. Baag; M.M. Bhatti
      Abstract: Publication date: Available online 5 September 2017
      Source:Alexandria Engineering Journal
      Author(s): S.R. Mishra, S. Baag, M.M. Bhatti
      This communication deals with the role of heat and mass transfer in a Walters B ′ (non-Newtonian) nanofluid fluid flow through a stretching vertical porous surface. The behavior of Brownian motion, chemical reaction, thermophoresis and heat generation/absorption are also taken into consideration. A suitable similarity transformation variable is utilized to model the equations of nanoparticle concentration, momentum, and thermal energy. These ordinary differential equations are solved analytically by means of perturbation technique and then solved numerically using fourth-fifth order Runge–Kutta method. The behavior of all the sundry parameters are discussed and demonstrated via graphs. Furthermore, Sherwood number, Nusselt number and skin friction coefficient are also displayed via graphs. A numerical comparison is also presented against skin friction coefficient, Nusselt number and Sherwood number with previously published data.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.08.007
       
  • Nanofluid flow on the stagnation point of a permeable non-linearly
           stretching/shrinking sheet

    • Authors: A. Malvandi; F. Hedayati; D.D. Ganji
      Abstract: Publication date: Available online 5 September 2017
      Source:Alexandria Engineering Journal
      Author(s): A. Malvandi, F. Hedayati, D.D. Ganji
      This paper studies a steady two-dimensional stagnation-point flow of nanofluids over a nonlinearly stretching/shrinking sheet in the presence of blowing/suction. The effects of different nanoparticle materials, namely copper, alumina and titania on the flow and heat transfer rate are investigated. Employing similarity variables, the governing partial differential equations including continuity, momentum and energy have been reduced to ordinary equations and are solved numerically via Runge-Kutta-Fehlberg scheme. It is shown that two solutions exist for shrinking sheets in both blowing and impermeable cases, while an additional solution appears in the case of suction (there are three solutions). Moreover, the effects of nonlinearly parameter β , blowing/suction S , and solid volume fraction ϕ on the heat and fluid flow characteristics are investigated in details.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.08.010
       
  • Effect of frictional heating on mixed convection flow of chemically
           reacting radiative Casson nanofluid over an inclined porous plate

    • Authors: C. Sulochana; G.P. Ashwinkumar; N. Sandeep
      Abstract: Publication date: Available online 5 September 2017
      Source:Alexandria Engineering Journal
      Author(s): C. Sulochana, G.P. Ashwinkumar, N. Sandeep
      The present study deals with the boundary layer analysis of a 2D magnetohydrodynamic flow of chemically reacting Casson nanofluid flow over a semi-infinite inclined porous plate. The energy and diffusion equation are encompassed with frictional heating, heat generation/absorption, thermo diffusion and thermal radiation effects. For making the analysis more attractive we pondered two distinct type of nanofluids namely, TiO2-water and CuO-water. The transmuted governing PDEs are resolved analytically by employing regular perturbation method. The impact of pertinent flow parameters on momentum, thermal and mass transport behavior including the skin friction factor, thermal and mass transport rate are examined and published with the assistance of graphical and tabular forms. Results describe that thermal radiation and chemical reaction restrictions have a propensity to enhance thermal and mass transport rates, respectively. And also, water based TiO2 nanofluid possess higher velocity compared with water based CuO nanofluids.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.08.006
       
  • Hermite wavelets operational matrix of integration for the numerical
           solution of nonlinear singular initial value problems

    • Authors: S.C. Shiralashetti; S. Kumbinarasaiah
      Abstract: Publication date: Available online 5 September 2017
      Source:Alexandria Engineering Journal
      Author(s): S.C. Shiralashetti, S. Kumbinarasaiah
      In this paper, new operational matrix of integration is generated by using Hermite wavelets. By aid of these matrices, Hermite wavelets operational matrix method (HWOMM) is developed for second ordered nonlinear singular initial value problems. Properties of Hermite wavelets are used to convert the differential equations into system of algebraic equations which can be efficiently solved by suitable solvers. Illustrative numerical problems are considered to demonstrate the applicability of the proposed technique and those results are comparing favourably with the exact solutions and errors.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.07.014
       
  • Analysis the optimum inlet air temperature for controlling homogeneous
           charge compression ignition (HCCI) engine

    • Authors: S. Gowthaman; A.P. Sathiyagnanam
      Abstract: Publication date: Available online 4 September 2017
      Source:Alexandria Engineering Journal
      Author(s): S. Gowthaman, A.P. Sathiyagnanam
      Homogeneous charge compression ignition engine is promising replacement for conventional CI diesel engine with lower oxides of nitrogen (NOx) and smoke emissions and improves the thermal efficiency with consume less amount of fuel. In general, HCCI engine operates with lean air/fuel charge for all operating condition, and it makes the HCCI combustion more complex and difficult to control the start of ignition point. The inlet air temperature is the primary parameter for controlling the HCCI combustion. In this study, the HCCI engine was operated at different inlet air temperatures as 90°C, 100°C, 110°C, 120°C, 130°C, 140°C and 150°C respectively. From this study, it was observed that the level of NOx emission increased with increasing the inlet air temperature and smoke emission was reduced with increasing the inlet charge temperature. The inlet air temperature about 120°C showed maximum reduction of smoke emission about 15HSU at 60% load. Similarly, CO and HC were reduced with increasing the inlet air temperature. The specific fuel consumption of HCCI mode engine decreased with increasing the inlet air temperature and the power output of the engine increased with increasing the suction air temperature.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.08.011
       
  • Optimization of Beam Shaping Assembly design for Boron Neutron Capture
           Therapy based on a transportable proton accelerator

    • Authors: Jacob G. Fantidis; G. Nicolaou
      Abstract: Publication date: Available online 4 September 2017
      Source:Alexandria Engineering Journal
      Author(s): Jacob G. Fantidis, G. Nicolaou
      The optimization of a Beam Shaping Assembly design for Boron Neutron Capture Therapy (BNCT), based on a commercial available proton accelerator, has been simulated. The primary goal is to improve the flux of the epithermal neutrons, which is the major drawback in all designed BNCT facilities with portable neutron source, satisfying simultaneously all the other relevant parameters. A BNCT facility has been simulated using the MCNP4B Monte Carlo code. A wide set of material were examined as moderators, while three different materials are used as fast neutron, gamma ray and thermal neutrons filters. Fast neutrons from 9Be(p,n)9B reaction are moderated through the 7LiF and TiF3 moderators and further reduced using 60Ni as fast neutron filter. The undesired gamma rays and thermal neutrons are removed using Bi and Cd filters respectively. The therapeutic efficacy of the proposed facility was calculated through the dosimetric evaluation in a head phantom. According to the results of the calculations the proposed unit satisfies the recommended by IAEA parameters. Only the flux of the epithermal neutrons remains below the recommended threshold, but is significantly improved.

      PubDate: 2017-09-10T12:43:06Z
      DOI: 10.1016/j.aej.2017.08.004
       
  • Emissions analysis on mahua oil biodiesel and higher alcohol blends in
           diesel engine

    • Authors: Arulprakasajothi Mahalingam; Yuvarajan Devarajan; Santhanakrishnan Radhakrishnan; Suresh Vellaiyan; Beemkumar Nagappan
      Abstract: Publication date: Available online 30 August 2017
      Source:Alexandria Engineering Journal
      Author(s): Arulprakasajothi Mahalingam, Yuvarajan Devarajan, Santhanakrishnan Radhakrishnan, Suresh Vellaiyan, Beemkumar Nagappan
      High cetane number and energy content of octanol can be an excellent alternative fuels for existing diesel engines. It is necessary to have an extensive analysis on octanol asan additive in diesel engines. In this study neat mahua oil biodiesel is blended with different proportion of octanol in stationary diesel engine to observe its emission characteristics. Mahua oil biodiesel is prepared by conventional transesterification. The main aim of this study is to reduce various emissions of mahua oil biodiesel by appending octanol. This study discovered a significant reduction in all the emissions associated with mahua oil biodiesel by appending octanol at different proportions.

      PubDate: 2017-09-04T11:53:28Z
      DOI: 10.1016/j.aej.2017.07.009
       
 
 
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