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  Subjects -> ENGINEERING (Total: 2273 journals)
    - CHEMICAL ENGINEERING (190 journals)
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    - ELECTRICAL ENGINEERING (101 journals)
    - ENGINEERING (1202 journals)
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ENGINEERING (1202 journals)            First | 1 2 3 4 5 6 7 | Last

Showing 401 - 600 of 1205 Journals sorted alphabetically
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 14)
IET Optoelectronics     Hybrid Journal   (Followers: 1)
IET Radar, Sonar & Navigation     Hybrid Journal   (Followers: 24)
IET Renewable Power Generation     Hybrid Journal   (Followers: 9)
IET Science, Measurement & Technology     Hybrid Journal   (Followers: 2)
IET Signal Processing     Hybrid Journal   (Followers: 16)
IETE Journal of Research     Open Access   (Followers: 8)
IETE Technical Review     Open Access   (Followers: 10)
IIE Transactions     Hybrid Journal   (Followers: 2)
IIUM Engineering Journal     Open Access  
Implementation Science     Open Access   (Followers: 15)
Indian Journal of Biotechnology (IJBT)     Open Access   (Followers: 2)
Indonesian Journal of Science and Technology     Open Access  
Industrial Data     Open Access   (Followers: 1)
Industrie et Technologies     Full-text available via subscription   (Followers: 15)
Informatik-Spektrum     Hybrid Journal   (Followers: 1)
Ingeniare : Revista Chilena de Ingenieria     Open Access  
Ingenieria     Open Access  
Ingeniería     Open Access  
Ingenieria de Recursos Naturales y del Ambiente     Open Access  
Ingeniería Energética     Open Access  
Ingenieria Industrial. Actualidad y Nuevas Tendencias     Open Access  
Ingeniería Investigación y Desarrollo     Open Access  
Ingeniería solidaria     Open Access   (Followers: 1)
Ingenieria y Ciencia     Open Access  
Ingeniería y Desarrollo     Open Access  
Ingenieria y Universidad     Open Access  
Ingeniería, Investigación y Tecnología     Open Access  
Ingenius : Revista de Ciencia y Tecnología     Open Access  
Innovare : Revista de ciencia y tecnología     Open Access  
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Integration, the VLSI Journal     Hybrid Journal   (Followers: 5)
Intelligent Control and Automation     Open Access   (Followers: 6)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 8)
Interface Science and Technology     Full-text available via subscription  
Intermetallics     Hybrid Journal   (Followers: 22)
International Archives of Science and Technology     Open Access  
International Communications in Heat and Mass Transfer     Hybrid Journal   (Followers: 19)
International conference KNOWLEDGE-BASED ORGANIZATION     Open Access  
International Heat Treatment and Surface Engineering     Hybrid Journal   (Followers: 3)
International Journal for Numerical Methods in Engineering     Hybrid Journal   (Followers: 29)
International Journal for Numerical Methods in Fluids     Hybrid Journal   (Followers: 19)
International Journal for Simulation and Multidisciplinary Design Optimization     Open Access   (Followers: 3)
International Journal for the History of Engineering & Technology     Hybrid Journal   (Followers: 8)
International Journal of Abrasive Technology     Hybrid Journal   (Followers: 2)
International Journal of Adaptive Control and Signal Processing     Hybrid Journal   (Followers: 2)
International Journal of Adhesion and Adhesives     Hybrid Journal   (Followers: 16)
International Journal of Advanced Engineering Research and Science IJAERS     Open Access   (Followers: 4)
International Journal of Advanced engineering, Management and Science     Open Access   (Followers: 1)
International Journal of Advancements in Technology     Open Access   (Followers: 1)
International Journal of Advances in Applied Sciences     Open Access   (Followers: 4)
International Journal of Advances in Engineering Sciences     Open Access   (Followers: 3)
International Journal of Advances in Engineering Sciences and Applied Mathematics     Hybrid Journal   (Followers: 1)
International Journal of Advances in Engineering, Science and Technology     Open Access   (Followers: 4)
International Journal of Aerodynamics     Hybrid Journal   (Followers: 19)
International Journal of Aerospace Innovations     Full-text available via subscription   (Followers: 18)
International Journal of Air-Conditioning and Refrigeration     Hybrid Journal   (Followers: 8)
International Journal of Antennas and Propagation     Open Access   (Followers: 9)
International Journal of Applied Ceramic Technology     Hybrid Journal   (Followers: 7)
International Journal of Applied Power Engineering     Open Access   (Followers: 4)
International Journal of Architectural Computing     Full-text available via subscription   (Followers: 5)
International Journal of Automation and Control Engineering     Open Access   (Followers: 4)
International Journal of Automotive Technology and Management     Hybrid Journal   (Followers: 6)
International Journal of Autonomic Computing     Hybrid Journal   (Followers: 1)
International Journal of Autonomous and Adaptive Communications Systems     Hybrid Journal   (Followers: 4)
International Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
International Journal of Bifurcation and Chaos     Hybrid Journal   (Followers: 2)
International Journal of Biomedical and Clinical Engineering     Full-text available via subscription   (Followers: 5)
International Journal of Biomedical Imaging     Open Access   (Followers: 5)
International Journal of Cast Metals Research     Hybrid Journal  
International Journal of Circuit Theory and Applications     Hybrid Journal   (Followers: 2)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Collaborative Engineering     Hybrid Journal  
International Journal of Combinatorics     Open Access   (Followers: 1)
International Journal of Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Complexity in Applied Science and Technology     Hybrid Journal  
International Journal of Computer Aided Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Computer Applications in Technology     Hybrid Journal   (Followers: 3)
International Journal of Control Science and Engineering     Open Access   (Followers: 5)
International Journal of Control, Automation and Systems     Hybrid Journal   (Followers: 12)
International Journal of Corrosion     Open Access   (Followers: 10)
International Journal of Crashworthiness     Hybrid Journal   (Followers: 9)
International Journal of Design Engineering     Hybrid Journal   (Followers: 14)
International Journal of Digital Multimedia Broadcasting     Open Access   (Followers: 5)
International Journal of Education and Management Engineering     Open Access   (Followers: 2)
International Journal of Education Economics and Development     Hybrid Journal   (Followers: 3)
International Journal of Embedded Systems     Hybrid Journal   (Followers: 5)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription   (Followers: 2)
International Journal of Energy Optimization and Engineering     Hybrid Journal   (Followers: 3)
International Journal of Engine Research     Hybrid Journal   (Followers: 1)
International Journal of Engineering & Technology     Open Access   (Followers: 6)
International Journal of Engineering and Manufacturing     Open Access   (Followers: 1)
International Journal of Engineering and Technologies     Open Access   (Followers: 1)
International Journal of Engineering Business Management     Open Access   (Followers: 1)
International Journal of Engineering Education     Full-text available via subscription   (Followers: 6)
International Journal of Engineering Management and Economics     Hybrid Journal   (Followers: 4)
International Journal of Engineering Mathematics     Open Access   (Followers: 3)
International Journal of Engineering Pedagogy     Open Access  
International Journal of Engineering Practical Research     Open Access  
International Journal of Engineering Research in Africa     Full-text available via subscription   (Followers: 3)
International Journal of Engineering Science     Hybrid Journal   (Followers: 6)
International Journal of Engineering Systems Modelling and Simulation     Hybrid Journal   (Followers: 9)
International Journal of Engineering, Science and Technology     Open Access  
International Journal of Engineering, Social Justice, and Peace     Open Access   (Followers: 4)
International Journal of Environmental Engineering     Hybrid Journal   (Followers: 6)
International Journal of Experimental Design and Process Optimisation     Hybrid Journal   (Followers: 5)
International Journal of Fatigue     Hybrid Journal   (Followers: 33)
International Journal of Flow Control     Full-text available via subscription   (Followers: 5)
International Journal of Foresight and Innovation Policy     Hybrid Journal   (Followers: 7)
International Journal of Fracture     Hybrid Journal   (Followers: 11)
International Journal of Geo-Engineering     Open Access   (Followers: 1)
International Journal of Geotechnical Engineering     Hybrid Journal   (Followers: 5)
International Journal of Grid and Utility Computing     Hybrid Journal  
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 31)
International Journal of Heat and Mass Transfer     Hybrid Journal   (Followers: 160)
International Journal of Heavy Vehicle Systems     Hybrid Journal   (Followers: 6)
International Journal of Hypersonics     Full-text available via subscription   (Followers: 4)
International Journal of Imaging Systems and Technology     Hybrid Journal   (Followers: 1)
International Journal of Impact Engineering     Hybrid Journal   (Followers: 9)
International Journal of Information Acquisition     Hybrid Journal   (Followers: 1)
International Journal of Innovation and Applied Studies     Open Access   (Followers: 5)
International Journal of Innovation Science     Hybrid Journal   (Followers: 9)
International Journal of Innovative Technology and Research     Open Access   (Followers: 1)
International Journal of Integrated Engineering     Open Access  
International Journal of Intelligent Engineering Informatics     Hybrid Journal  
International Journal of Intelligent Systems and Applications in Engineering     Open Access   (Followers: 3)
International Journal of Lifecycle Performance Engineering     Hybrid Journal   (Followers: 1)
International Journal of Machine Tools and Manufacture     Hybrid Journal   (Followers: 7)
International Journal of Manufacturing Research     Hybrid Journal   (Followers: 6)
International Journal of Manufacturing Technology and Management     Hybrid Journal   (Followers: 8)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 5)
International Journal of Mathematical Education in Science and Technology     Hybrid Journal   (Followers: 9)
International Journal of Mathematics in Operational Research     Hybrid Journal  
International Journal of Medical Engineering and Informatics     Hybrid Journal   (Followers: 4)
International Journal of Micro Air Vehicles     Full-text available via subscription   (Followers: 8)
International Journal of Microwave Science and Technology     Open Access   (Followers: 4)
International Journal of Mobile Network Design and Innovation     Hybrid Journal   (Followers: 1)
International Journal of Multiphase Flow     Hybrid Journal   (Followers: 4)
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal   (Followers: 2)
International Journal of Nanotechnology     Hybrid Journal   (Followers: 6)
International Journal of Nanotechnology and Molecular Computation     Full-text available via subscription   (Followers: 3)
International Journal of Navigation and Observation     Open Access   (Followers: 19)
International Journal of Network Management     Hybrid Journal   (Followers: 1)
International Journal of Nonlinear Sciences and Numerical Simulation     Hybrid Journal  
International Journal of Numerical Methods for Heat & Fluid Flow     Hybrid Journal   (Followers: 9)
International Journal of Optics     Open Access   (Followers: 6)
International Journal of Organisational Design and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Pattern Recognition and Artificial Intelligence     Hybrid Journal   (Followers: 7)
International Journal of Pavement Engineering     Hybrid Journal   (Followers: 6)
International Journal of Physical Modelling in Geotechnics     Hybrid Journal   (Followers: 4)
International Journal of Plasticity     Hybrid Journal   (Followers: 7)
International Journal of Plastics Technology     Hybrid Journal   (Followers: 1)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
International Journal of Polymer Science     Open Access   (Followers: 23)
International Journal of Precision Engineering and Manufacturing     Hybrid Journal   (Followers: 8)
International Journal of Precision Engineering and Manufacturing-Green Technology     Hybrid Journal  
International Journal of Precision Technology     Hybrid Journal  
International Journal of Pressure Vessels and Piping     Hybrid Journal   (Followers: 17)
International Journal of Production Economics     Hybrid Journal   (Followers: 13)
International Journal of Quality and Innovation     Hybrid Journal   (Followers: 5)
International Journal of Quality Assurance in Engineering and Technology Education     Full-text available via subscription   (Followers: 3)
International Journal of Quality Engineering and Technology     Hybrid Journal   (Followers: 2)
International Journal of Quantum Information     Hybrid Journal   (Followers: 3)
International Journal of Rapid Manufacturing     Hybrid Journal   (Followers: 4)
International Journal of Recent Contributions from Engineering, Science & IT     Open Access   (Followers: 1)
International Journal of Reliability, Quality and Safety Engineering     Hybrid Journal   (Followers: 13)
International Journal of Renewable Energy Technology     Hybrid Journal   (Followers: 10)
International Journal of Robust and Nonlinear Control     Hybrid Journal   (Followers: 4)
International Journal of Science Engineering and Advance Technology     Open Access  
International Journal of Sediment Research     Full-text available via subscription   (Followers: 3)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal   (Followers: 2)
International Journal of Service Science, Management, Engineering, and Technology     Full-text available via subscription   (Followers: 1)
International Journal of Signal and Imaging Systems Engineering     Hybrid Journal  
International Journal of Six Sigma and Competitive Advantage     Hybrid Journal   (Followers: 2)
International Journal of Social Robotics     Hybrid Journal   (Followers: 3)
International Journal of Software Engineering and Knowledge Engineering     Hybrid Journal   (Followers: 5)
International Journal of Space Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Speech Technology     Hybrid Journal   (Followers: 8)
International Journal of Spray and Combustion Dynamics     Hybrid Journal   (Followers: 13)
International Journal of Surface Engineering and Interdisciplinary Materials Science     Full-text available via subscription   (Followers: 1)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Sustainable Manufacturing     Hybrid Journal   (Followers: 5)
International Journal of Systems and Service-Oriented Engineering     Full-text available via subscription  
International Journal of Systems Assurance Engineering and Management     Hybrid Journal  
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Technoethics     Full-text available via subscription   (Followers: 1)
International Journal of Technology Management and Sustainable Development     Hybrid Journal   (Followers: 1)
International Journal of Technology Policy and Law     Hybrid Journal   (Followers: 6)
International Journal of Telemedicine and Applications     Open Access   (Followers: 3)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 15)
International Journal of Thermodynamics     Open Access   (Followers: 9)
International Journal of Turbo & Jet-Engines     Hybrid Journal   (Followers: 3)
International Journal of Ultra Wideband Communications and Systems     Hybrid Journal  
International Journal of Vehicle Autonomous Systems     Hybrid Journal  
International Journal of Vehicle Design     Hybrid Journal   (Followers: 6)
International Journal of Vehicle Information and Communication Systems     Hybrid Journal   (Followers: 2)
International Journal of Vehicle Noise and Vibration     Hybrid Journal   (Followers: 4)
International Journal of Vehicle Safety     Hybrid Journal   (Followers: 6)

  First | 1 2 3 4 5 6 7 | Last

Journal Cover Engineering Journal
  [SJR: 0.227]   [H-I: 8]   [1 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 0125-8281 - ISSN (Online) 0125-8281
   Published by Chulalongkorn University Homepage  [1 journal]
  • Metathesis of Ethylene and Trans-2-Butene over MgO Admixed WO3/SiO2
           Catalysts

    • Authors: Prinyanee Suttibut, Piyasan Praserthdam, Joongjai Panpranot
      Pages: 1 - 16
      Abstract: The performances of MgO admixed WO3/SiO2 catalysts were investigated in the cross metathesis of ethylene and 2-butene to propylene at 450oC atmospheric pressure. Compared to the WO3/SiO2 + silica gel, the conversion of 2-butene and the propylene selectivity were much higher on all the WO3/SiO2 + MgO catalysts. An increased propylene yield corresponded to the decrease in 1-butene and cis-2-butene by products. The results in this study also suggest suitable method to prepare highly stable MgO catalysts in order to maximize the propylene yield.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Improvement of Cobalt Dispersion on Co/SBA-15 and Co/SBA-16 Catalysts by
           Ultrasound and Vacuum Treatments during Post-Impregnation Step

    • Authors: Jittraporn Kruatim, Sasiradee Jantasee, Bunjerd Jongsomjit
      Pages: 17 - 28
      Abstract: The Co/SBA-15 and the Co/SBA-16 catalysts having 20 wt% of cobalt were prepared by the conventional impregnation method. Then, the post-impregnation treatments including vacuum and ultrasound treatments were applied. The synthesized catalysts were characterized by means of N2 physisorption, small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (XRD), scanning electron microscopy and energy dispersive X-ray spectroscopy (SEM/EDX), transmission electron microscopy (TEM), and temperature-programmed reduction (TPR). The results show that the synthesized SBA-15 had hexagonal structure and the synthesized SBA-16 had the cubic structure. The vacuum and the ultrasound treatments after incipient wetness impregnation can apparently enhance the dispersion of cobalt on the SBA-15 catalysts due to the decrease of the metal crystallite size. However, only the vacuum treatment was suitable for the Co/SBA-16. After reduction, no cobalt-silicate compound was detected based on XRD measurement. Both post-impregnation treatments can also decrease the metal-support interaction resulting in increased activity for CO2 hydrogenation under methanation.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Environmentally-Friendly RF Plasma Treatment of Thai Silk Fabrics with
           Chitosan for Durable Antibacterial Property

    • Authors: Doonyapong Wongsawaeng, Sarayut Khemngern, Naraporn Somboonna
      Pages: 29 - 43
      Abstract: A 13.56 MHz RF plasma discharge was successfully utilized to activate and coat Thai silk fabrics with chitosan for durable antibacterial property. Uncolored and untreated Thai silk fabrics were activated in Ar plasma for 5 minutes with an optimized RF power of 120 W under Ar pressure of 0.8 Torr. After plasma activation, specimens were submerged and stirred in a 1% (w/v) chitosan solution. FTIR analysis confirmed the presence of chitosan on the silk fabrics. From SEM analysis, chitosan was observed to coat silk fibers almost everywhere. RF plasma treated fabrics were able to absorb the chitosan solution substantially faster than those without the treatment. Another benefit of increased hydrophilicity is the ability of the treated fabrics to allow human perspiration to flow through more effectively, providing additional comfort when worn in tropical-zone countries. Antibacterial properties against E. coli and S. aureus reduced with increasing washing cycles dropping to approximately 95% after 5 rounds of washing. Extrapolation of linear trend lines revealed that for the case of E. coli, it will take approximately 16 washing cycles to reduce the antibacterial ability to 90%. For the case of S. aureus, it will take approximately 10 washing cycles to reduce the antibacterial ability to 90%. Fabrics without RF plasma treatment prior to chitosan solution submersion will have their antibacterial ability for E. coli and S. aureus reduced to 90% after only about 5 washing cycles. Thus, RF plasma treatment can effectively induce chitosan to provide a strong and durable coating for Thai silk fabrics, thus, offering a new, very environmentally-friendly coating technique for Thai silk with chitosan for potential use in the textile industry.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Kinetic Study of Palm Fatty Acid Distillate Esterification with Glycerol
           over Strong Acidic Cation Exchanger Tulsion 42SM

    • Authors: Hanifrahmawan Sudibyo, Rochmadi Rochmadi, Mohammad Fahrurrozi
      Pages: 45 - 61
      Abstract: Palm Fatty Acid Distillate (PFAD) is a byproduct of CPO production. PFAD conversion into monoglyceride would give significant economic added value to it. With free fatty acid as the major component which composes the PFAD, then the esterification process was the right choice. Utilization of strong acidic cation resin as a catalyst is interesting. The catalyst could be easily separated physically. Natural esterification reaction would run reversibly so that the reflux system would be created to remove water. Reflux system used xylene as the solvent. To find the optimum condition for reaction parameters, reaction temperature, mole ratio of PFAD-glycerol, and catalyst loading were varied. Two heterogeneous reaction mechanisms, Langmuir – Hinshelwood and Eley – Rideal model, were tried to fit with the experimental data which resulted in the first model fitted the experimental data better than the second model. The reaction mechanism would involve the side reaction of diglyceride and triglyceride formation.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • An Integrated Pedal Follower and Torque Based Approach for Electronic
           Throttle Control in a Motorcycle Engine

    • Authors: Ashok B., Denis Ashok S., Ramesh Kumar C.
      Pages: 63 - 80
      Abstract: Nowadays, electronic throttle control system is widely adapted in the motorcycle for better drivability, fuel economy and reduces the emissions. In such systems, pedal follower or torque based approach are used for calculating the required throttle angle for the given torque demand by driver. This work presents a throttle control system for the precise estimation of throttle angle based on the integrated pedal follower and torque based approach for the given accelerator position and torque demand by the driver. A mathematical model for an electronic throttle body is developed to understand the effects of nonlinearities due to friction and limp home dual springs. A PID controller with compensators are developed to handle the nonlinearities due to the friction and limp home dual springs in the proposed electronic throttle control system. A simulation study has been carried out using software in loop and hardware in loop simulation approaches for step, sinusoidal, and ramp input signals. The responses of electronic throttle body for opening the throttle angle and error are analyzed for the given input signals. The simulation result shows that the proposed compensators has significant advantage in reducing the throttle angle error and gives the desired output.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Photocatalytic Degradation of Phenol over Highly Visible-Light Active
           BiOI/TiO2 Nanocomposite Photocatalyst

    • Authors: Natkritta Boonprakob, Weerasak Chomkitichai, Jiraporn Ketwaraporn, Aimon Wanaek, Burapat Inceesungvorn, Sukon Phanichphant
      Pages: 81 - 91
      Abstract: BiOI/TiO2 nanocomposites were successfully prepared by the two-step method, co-precipitation/solvothermal method. The amount of BiOI in the composites were varied as 0, 5.0, 7.5, 10.0 and 12.5 mol%. XRD results exhibited sharp and narrow diffraction peaks of both BiOI and TiO2 in all composite samples. Morphologies of as-prepared samples consisted of spherical shapes of TiO2 and nanosheets of BiOI. Difuse Reflectance UV–visible (DR–UV–vis) spectra of composites drastically shifted into the visible range and the reduced band gap energies were observed. The composits obviously showed an enhanced phenol degradation of ca. 6 times higher than that of pure BiOI, pure TiO2 and Degussa P25. The maximum photocatalytic activity of ca. 68% was found for 10.0 mol% BiOI/TiO2 nanocomposite because of its increased visible-light-harvesting ability and its efficient electron–hole separation efficiency as observed from DR–UV–vis and PL spectra results.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Nonlinear Finite Element Analysis to Evaluate Lateral Torsional Buckling
           Moment of Elliptical Cellular Steel Beams

    • Authors: Kitjapat Phuvoravan, Phattaraphong Ponsorn
      Pages: 93 - 108
      Abstract: In evaluation the lateral torsional buckling moment of Elliptical Cellular beams, it cannot be directly accurately calculated because the sectional properties of the Elliptical Cellular beam are not constant along the beam length. Consideration of sectional properties at web-post section will certainly affect to unconservative result, and the consideration the sectional properties at web-opening section is also unreal and unduly conservative design. Therefore, the main objective of this paper is to present the guideline to evaluate the lateral torsional buckling moment of Elliptical Cellular beam for conservative result and more precisely. The study has been performed throughout finite element analysis in both elastic and inelastic buckling behavior subject of equal beam-ends moment. More than 15 sections, 120 of beam models were simulated and analyzed with verified finite element modelling by using shell element. The results of this study show that the most of beam has behavior in elastic buckling range, calculation the lateral torsional buckling moment of Elliptical Cellular beam with the original equation given in AISC standard with using the sectional properties at web-post section is given unsafe result about 5% in elastic range and up to 20% in inelastic and plastic range. Evaluation the lateral torsional buckling moment by use the reduction factor, R_ECB, that proposed from this study has yielded the conservative result and has more precisely, more economically and less distribution of the result than the evaluation that using sectional properties at web-opening section.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Impact Analyses of a Tennis Ball onto Water-Filled Containers

    • Authors: Kanokporn Pintobtang, Tumrong Puttapitukporn
      Pages: 109 - 125
      Abstract: Water-filled containers have long known for its structural characteristic of impact load absorption. This paper presents design of structures resisting to impact load resulting from a high-velocity tennis ball. One cubic meter water containers consisting of rectangular, cylindrical, and spherical water containers and water levels were studied for their stress distribution and deformation during maximum deformation period using finite element analysis in the ANSYS 15.0 software. The containers were modeled by using shell elements and made of elasto-plastic material of HDPE plastic. The filled water was model by using fluid elements. We found that as ball velocity increased, maximum von Mises stress increased. However, for post-yielding behavior, maximum von Mises stress approached a constant near yield stress of HDPE material. As ball velocity increases, deformation increases. When water level increased, maximum deformation decreased. For the rectangular container, when the water level increases, the maximum von Mises stress increases while maximum deformation decreases. For the cylindrical and spherical containers, when water level increases, both maximum von Mises stress and maximum deformation decreases. The fully-filled spherical water container had illustrated the superb capabilities to absorb and to dissipate impact load to the rest of the container structure.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Neural Network Based Modeling and Control for a Batch Heating/Cooling
           Evaporative Crystallization Process

    • Authors: Wachira Daosud, Jedsada Thampasato, Paisan Kittisupakorn
      Pages: 127 - 144
      Abstract: Crystallization processes have been widely used for separation in many fields to provide a high purity product. In this work, dynamic optimization and neural network (NN) have been applied to improve the quality of the product: citric acid. In the dynamic optimization, optimization problems maximizing both crystal yield and crystal size have been formulated. The neural networks have been developed to provide NN models to be used in the formulation of not only neural network inverse control (NNDIC) but also neural network model predictive control (NNMPC) strategies. The Levenberg Marquadt algorithm has been used to train the network and optimal neural network architectures have been determined by a mean squared error (MSE) minimization technique. In addition, a neural network model has been designed to provide estimates of the temperature and the concentration of the crystallizer. These estimates have been incorporated into the NNMPC controller. In the NNDIC controller, another neural network model has been applied to predict the set point of jacket temperature. The simulation results have shown that the obtained crystal size is increased by 19% and 30% compared to that by cooling and evaporation methods respectively and the obtained yield is increased more than 50%. The robustness of the proposed controller is investigated with respect to parameters mismatches. The results have shown that the NNMPC controller provides superior control performances in all case studies.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Modification of a Substrate Roughness for a Fabrication of Freestanding
           Electroplated Metallic Microstructures

    • Authors: Alongkorn Pimpin, Werayut Srituravanich
      Pages: 145 - 154
      Abstract: This study aims to demonstrate a simple fabrication technique of freestanding electroplated metallic microstructures by modifying a substrate roughness. The proposed technique utilizes counter effects between two forces, i.e. an intrinsic force causing shrinkage in an electroplated metallic microstructure, and an adhesive force adhering a metallic microstructure to a substrate. With the modification of substrate roughness until the adhesive force becomes weaker than the induced intrinsic force, electroplated metallic microstructures would spontaneously release from the substrate after the electroplating process. Three parameters, i.e. substrate roughness, electroplated square structure’s area and electroplated rectangular structure’s width-to-length ratio, were experimentally studied. The results showed that the electroplated structure with a smaller size and smaller width-to-length ratio was more easily detached from the substrate for a given substrate roughness. In addition, for the same electroplated structure, a substrate with less roughness allowed a detachment of electroplated microstructure more easily.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Effect of Atomization Parameters on Size and Morphology of Al-17Si Alloy
           Powder Produced by Free Fall Atomizer

    • Authors: Dayanand M. Goudar, V. C. Srivastava, G. B. Rudrakshi
      Pages: 155 - 168
      Abstract: Abstract: In the present work the effect of process parameters on the characteristics of Al-17Si alloy powder produced by gas atomization using a free fall nozzle of different apex angles. The axial gas velocity away from the nozzle exit is measured for different operating pressures. The alloy was melted to a superheat temperature of 100,150 and 200° C and atomized by varying the gas flow rate and melt flow rate. The powder produced during gas atomization process generally exhibits a wide size distribution. ASTM standard sieve with vibratory shaker is used for powder analysis. The characterization of powder particles was accomplished by the parameters such as mass median, average size of powder particles; standard deviation and morphology of powder were studied by scanning electron microscopy. It is observed that decrease of apex angle results in axial velocity decreases in entire applied gas pressures range. Increase in apex angle results in decrease of gas jet length to metal stream collision, the median particle diameter of the powder increases resulting in decrease in particle irregularity. The median particle diameter of the powder has been shown to decrease almost linearly with increase in gas to melt flow (G/M) ratio. The sauter mean diameter variation, however, decreases slowly with increase in G/M ratio. Median particle diameter is significantly reduced with increase in the melt superheat.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • A Study of Heat Transfer on Front and Back Vented Brake Disc Effect on
           Vibration

    • Authors: Supachai Lakkam, Phupoom Puangcharoenchai, Kullayot Suwantaroj
      Pages: 169 - 180
      Abstract: The purpose of this study was to investigate the vibration characteristics caused by front and back vented brake disc which were physical shape difference. According to theory of heat transfer, the heat transfer rates of two types of brake disc were different and play a role in the deformation during usage. The single dynamometer was conducted to the experimental work as an engineering tool with boundary condition of JASO C406 standard. The measured one degree of freedom (DOF) acceleration signals on the brake caliper were analyzed. The results obviously discovered that the back vented brake disc was able to reduce vibration maximum to 43.5% comparing to the front vented brake disc in case of the braking temperature 200C with initial breaking speed 50 km/h and the hydraulic pressure of 4 MPa. Besides, the hydraulic pressure at 4 MPa played a maximum role in the vibration. Furthermore, the initial braking speed and the braking temperature were also the important factors.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Rotary Friction Welding of Dissimilar Joints between SSM356 and SSM6061
           Aluminium Alloys Produced by GISS

    • Authors: Suppachai Chainarong, Chaiyoot Meengam, Muhamad Tehyo
      Pages: 181 - 191
      Abstract: The objective of research is to investigate the parameters, microstructure and mechanical properties of butt joint SSM356 with SSM6061 aluminum alloy by using RFW processes. The main parameters for rotation speeds are 1550, 1700 and 1850 rpm and for burn of length are 2, 2.5 and 3 mm respectively. After experiment, we found that both materials showed strong weld ability although it has a different chemical composition. The microstructural changes in welded metals caused deformation leading to smaller particle sizes. The average Mg2Si particle size was at 0.998 µm long and the width of this particle was at 1.021 µm when it was rotated at 1850 rpm with burn of length at 2.5 mm. The maximum average tensile strength is 87.24 MPa, efficiency of the weld joints is 51.89 percent compared with the base metal of SSM356 aluminum alloys (base metal is 168.12 MPa), and efficiency of the weld joints is 68.45 percent compared with the base metal of SSM6061 aluminum alloys (base metal is 127.44 MPa). Besides, the small particle distribution in the welded metal promotes the hardness property increasing up to 65.56 HV.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Influence of Soft Magnetic Materials Application to Squirrel Cage
           Induction Motor Design and Performance

    • Authors: Yannis L. Karnavas, Ioannis D. Chasiotis
      Pages: 193 - 206
      Abstract: Most of the electrical machines design studies found in literature lie on the concept that the design under investigation (and optimization) focuses mainly on the geometrical aspects of the machine and thus takes into account only a certain ferromagnetic material (i.e. iron) for its parts. These studies, give little or no information about the influence of material alternatives on the same (and optimized) design. From a manufacturers’ point of view though, this information is crucial especially nowadays that there are a lot of commercially available materials in the market. In this context, this paper presents the results of a research project in the design stage of an energy efficient three phase squirrel cage induction motor (SCIM), by investigating the effects of several soft magnetic materials (adopted for its stator and/or its rotor parts) on multiple quantities of primary concern such as: efficiency, power factor, output torque, losses, weight and cost. After a brief proposed design procedure, a total of twenty-two different materials from recent manufacturers’ data were examined. Also, the main electromagnetic analysis was performed through commercial analysis software. Simple ranking methods are also proposed here and the results obtained are then thoroughly discussed and commented.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Model Reference Input Shaping Using Quantitative Feedforward-Feedback
           Controller

    • Authors: Withit Chatlatanagulchai
      Pages: 207 - 220
      Abstract: Input shaping convolutes the reference signal with a sequence of impulses, whose amplitudes and timings are designed to produce a shaped reference that avoids exciting lightly-damped modes to reduce residual vibration from a quick movement. The input shaper can be made robust to uncertain mode parameters by adding more impulses, which delays the reference signal, resulting in longer move time. Instead of using more impulses, in this paper, a feedforward-feedback control system, based on the quantitative feedback theory, is placed in the loop to match the closed-loop system, with uncertain plant, to a known reference model. The feedforward-feedback system handles the uncertainty, so the input shaper, placed outside the loop, needs not be robust. The closed-loop system emphasizes on selected frequencies and reduces the cost of feedback. It is shown that the proposed feedforward-feedback system is less conservative than the pure-feedback system. Other sources of vibration such as external disturbances and noise can be handled by the feedforward-feedback system as well. Simulation shows that the proposed technique can withstand large plant uncertainty with fast move time when compared to traditional robust input shaper.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • An Integrating Finite Element Method and Multi-body Simulation for Drive
           Systems Analysis

    • Authors: Wasan Suwannahong, Chakrit Suvanjumrat
      Pages: 221 - 234
      Abstract: Roller chain and sprockets has important components of the drive system in production lines for any industries. Many problems which concerned to failure of roller chain and sprockets would break down the producing process. To understand every failure behavior might be used a long time of experience in production lines. Furthermore, some phenomena of failure cases for roller chain and sprockets were unpredictable by an analytic method. This research aimed to propose failure cases of roller chain and sprocket by simulation results. The new method for simulation of drive system was employed to analyze roller chain and a sprocket. The finite element method which was used to simulate behavior of failure parts was integrated with multi-body system of rigid parts in the driving system. The integration of simulation methods would explain failure cases of roller chain and a sprocket distinctively. Particularly, simulation results in many forms of the roller chain and a sprocket attachment would be good examples for engineering study and design of drive system in a further work.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Performance Study on a Window Type Air Conditioner Condenser Using
           Alternative Refrigerant R407C

    • Authors: Abdul Hadi N. Khalifa, Johain J. Fataj, Ali K. Shaker
      Pages: 235 - 243
      Abstract: In this work, a performance study was achieved on air cooled condenser of an air-conditioning unit. An experimental investigation was carried out on two condenser designs aided by a controlled environmental zone, which was designed and constructed for the current study. The effect of ambient air temperature on the condenser performance was studied by varying the controlled zone air temperature from 30 to 50 oC. The first design is a four circuits 5/16" tube diameter condenser and the second is an eight circuits design with the same diameter. The experimental results showed that, an increase in the ambient air temperature has a negative effect on COP due to the decrease in the overall heat rejected, yet has a positive effect on refrigerant side pressure drop.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Microstructural and Diffusion Analysis of Au-Sn Diffusion Couple Layer
           Undergoing Heat Treatment at Near Eutectic Temperatures

    • Authors: Jidsucha Darayen, Panaaek Athichalinthorn, Ratchatee Techapiesancharoenkij, Sasawat Mahabunphachai, Chedtha Puncreobutr, Gobboon Lothongkum, Boonrat Lohwongwatana
      Pages: 245 - 253
      Abstract: Diffusion couples of pure gold and pure tin were created by mechanical cold rolling method. The couples were isothermally treated at temperatures slightly above and below the eutectic temperature near tin-rich region of the equilibrium phase diagram. Differences in the diffusion behaviors were observed as a function of treatment temperatures below (473 K) and above (498 K) the eutectic temperature. At the boundary, it was found that first solid state inter-diffusion was initiated which resulted in local compositional change and solid-state formation of intermetallic compounds. As the composition shifts away towards mixing, the growth of the intermetallic phases was monitored as a function of temperature and time. At temperature above the eutectic, there may be a liquid fraction as the interface isothermally melted. The kinetic involves dissolution of Au atoms into locallized tin-rich liquid. At below eutectic temperature, the formation and growth kinetic of phases follows a solid state diffusion mechanism. By investigation the exponent n values in the growth equation l=k(t/t0)n, the values were found to be in between 0.62 - 0.77 which implies that the kinetics of IMC formations experiment are controlled by both diffusion and intermetallic reaction. The bonding temperature was found to be faster and more reliable at bonding temperature slightly above the eutectic.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Experimental Study of Copper Nano-fluid on Thermosyphons Thermal
           Performance

    • Authors: Jirapol Klinbun, Pradit Terdtoon
      Pages: 255 - 264
      Abstract: A new way to remove the intense heat by developing and implementing an innovative low cost compact loop thermosyphon has been widely observed. Especially, it was concluded that nano-fluids are potential heat transfer fluids to be used as working fluid in thermosyphon. Therefore, the thermophysical or transport properties of nano-fluids in thermosyphon need to be discussed. In present work was to experimental study the thermal performance of thermosyphon using a copper nano-fluid as a working fluid. The experiment was performed in order to measure the temperature distribution and compare heat transfer rate of the thermosymphon with nano-fluid and with pure water. The concentration of copper nano-particle was 10, 30 and 50 ppm. The tested working temperature was 60, 70 and 80C. Results shown that the concentration of 50 ppm of copper nano-fluid improved thermal performance compared with the case of pure water. The optimum and behavior of copper nano-fluid in thermosyphon is presented, which highlights all of the beforehand mentioned advantages.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Investigating Lateritic Soil Properties and Impacts from Quarrying
           Activity on Communities in Southern Thailand: A Case Study

    • Authors: Piti Chantruthai, Thananan Areepong, Sasitorn Issaro, Saravut Jaritngam
      Pages: 265 - 278
      Abstract: This paper details the impact arising from the lateritic soil quarrying activity in many communities within Songkhla province of Southern Thailand. The affected communities of Ban Khuan Chong, Ban Huay Oan and Ban Thung Don were selected as target areas for the study based on the suitability of their active quarry sizes and locations which are conspicuous on the aerial photographs of Google Maps, and where permission to collect data was forthcoming from the quarry operators. Assessments were made to determine the extent of impact on the communities in terms of the environment, people’s health, and effects on transport infrastructure. Findings from the study are shown on the website: http://techno.nstru .ac.th/piti/project in order to help promote responsible quarrying and use of lateritic soil in the construction business. In addition to details of the likely impacts from various types of soil excavation, the website features a database of quarry sites in the province as well as engineering properties of the soils therefrom.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
  • Cognitive Wireless Sensor Networks: Intelligent Channel Assignment

    • Authors: Soamsiri Chantaraskul, Chayaphon Tanwongvarl
      Pages: 279 - 292
      Abstract: One of the major problems in Wireless Sensor Networks (WSNs) is the traffic congestion caused by increasing number of devices sharing the limited spectrum of the ISM (Industrial, Scientific, and Medical radio) band. As a result, a new concept of Cognitive Wireless Sensor Networks (CWSNs) has been proposed in order to achieve reliable and efficient communication via spectrum awareness and smart adaption. Based on such concept, this paper proposes the intelligent channel assignment technique for channel management in CWSNs. The proposed method is based on the learning and prediction technique so called Policy Gradient together with our proposed virtual channel environment classification. Simulation model is used for the system performance evaluation. The simulation results show that our proposed intelligent channel assignment provides substantially higher performance in terms of system throughput and average packet end-to-end delay than the traditional IEEE 802.15.4 based system. It also outperforms the systems integrated with Episodic Reinforcement and GPOMDP learning technique.
      PubDate: 2017-02-16
      Issue No: Vol. 21, No. 1 (2017)
       
 
 
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