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    - ENGINEERING (1120 journals)
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ENGINEERING (1120 journals)            First | 1 2 3 4 5 6 7 8 | Last

Developments in Geotechnical Engineering     Full-text available via subscription   (Followers: 1)
Developments in Mineral Processing     Full-text available via subscription  
Diálogos Interdisciplinares     Open Access  
Diamond Light Source Proceedings     Full-text available via subscription  
Digital Signal Processing     Hybrid Journal   (Followers: 4)
Discrete Optimization     Full-text available via subscription   (Followers: 4)
Doct-Us Journal     Open Access  
Documents pour l'histoire des techniques     Open Access   (Followers: 1)
Dyes and Pigments     Hybrid Journal   (Followers: 3)
Dyna     Open Access  
Dynamical Systems: An International Journal     Hybrid Journal   (Followers: 1)
El Hombre y la Máquina     Open Access  
Electromagnetics     Hybrid Journal   (Followers: 1)
Electrophoresis     Hybrid Journal   (Followers: 5)
Elsevier Geo-Engineering Book Series     Full-text available via subscription   (Followers: 1)
Elsevier Ocean Engineering Series     Full-text available via subscription  
Embedded Systems Letters, IEEE     Hybrid Journal   (Followers: 14)
Energies     Open Access   (Followers: 1)
Energy and Power Engineering     Open Access   (Followers: 6)
Energy Conversion and Management     Hybrid Journal   (Followers: 6)
Energy Engineering     Full-text available via subscription   (Followers: 8)
Energy for Sustainable Development     Hybrid Journal   (Followers: 8)
Energy Procedia     Open Access   (Followers: 2)
Energy Science & Engineering     Open Access   (Followers: 3)
Energy Science and Technology     Open Access   (Followers: 9)
Energy Sources, Part A: Recovery, Utilization, and Environmental Effects     Hybrid Journal   (Followers: 2)
Energy Sources, Part B: Economics, Planning, and Policy     Hybrid Journal   (Followers: 6)
Energy Systems     Hybrid Journal   (Followers: 8)
ENGEVISTA     Open Access  
ENGI : Revista Electrónica de la Facultad de Ingenieria     Open Access  
Engineer : Journal of the Institution of Engineers, Sri Lanka     Open Access  
Engineering     Open Access   (Followers: 2)
Engineering & Technology     Hybrid Journal   (Followers: 15)
Engineering Analysis with Boundary Elements     Hybrid Journal   (Followers: 1)
Engineering Computations     Hybrid Journal   (Followers: 3)
Engineering Economics     Open Access   (Followers: 4)
Engineering Economist, The     Hybrid Journal   (Followers: 3)
Engineering Education     Open Access  
Engineering Failure Analysis     Hybrid Journal   (Followers: 22)
Engineering Geology     Hybrid Journal   (Followers: 7)
Engineering Journal     Open Access   (Followers: 1)
Engineering Management Journal     Hybrid Journal   (Followers: 12)
Engineering Management Research     Open Access   (Followers: 4)
Engineering Management Reviews     Open Access   (Followers: 1)
Engineering Optimization     Hybrid Journal   (Followers: 5)
Engineering Sciences     Open Access  
Engineering Studies     Hybrid Journal  
Engineering With Computers     Hybrid Journal   (Followers: 5)
Engineering, Technology & Applied Science Research     Open Access  
Entramado     Open Access  
Entropy     Open Access   (Followers: 3)
Environmental & Engineering Geoscience     Full-text available via subscription   (Followers: 2)
Environmental and Ecological Statistics     Hybrid Journal   (Followers: 5)
Environmetrics     Hybrid Journal  
Épités - Épitészettudomány     Full-text available via subscription   (Followers: 1)
EPJ Photovoltaics     Open Access  
Ergonomics in Design: The Quarterly of Human Factors Applications     Hybrid Journal   (Followers: 5)
ESAIM: Control Optimisation and Calculus of Variations     Full-text available via subscription  
ESAIM: Mathematical Modelling and Numerical Analysis     Full-text available via subscription   (Followers: 3)
ESAIM: Proceedings     Open Access  
Estuaries and Coasts     Hybrid Journal   (Followers: 3)
EURASIP Journal on Advances in Signal Processing     Open Access   (Followers: 3)
European Journal of Combinatorics     Full-text available via subscription   (Followers: 1)
European Journal of Engineering Education     Hybrid Journal   (Followers: 1)
European Journal of Lipid Science and Technology     Hybrid Journal   (Followers: 1)
European Journal of Mass Spectrometry     Full-text available via subscription   (Followers: 10)
European Medical Device Technology     Full-text available via subscription   (Followers: 2)
European Physical Journal - Applied Physics     Full-text available via subscription   (Followers: 4)
European Transport Research Review     Open Access   (Followers: 9)
Evolutionary Intelligence     Hybrid Journal  
Evolving Systems     Hybrid Journal  
Exacta     Open Access  
Experimental Techniques     Hybrid Journal   (Followers: 15)
Experiments in Fluids     Hybrid Journal   (Followers: 5)
Fibers and Polymers     Full-text available via subscription   (Followers: 3)
Filtration & Separation     Full-text available via subscription   (Followers: 1)
Finite Fields and Their Applications     Full-text available via subscription   (Followers: 2)
Fire Science Reviews     Open Access   (Followers: 1)
First Monday     Open Access   (Followers: 147)
Flexible Services and Manufacturing Journal     Hybrid Journal   (Followers: 2)
Flow, Turbulence and Combustion     Hybrid Journal   (Followers: 14)
Fluid Dynamics     Hybrid Journal   (Followers: 5)
Fluid Dynamics Research     Full-text available via subscription   (Followers: 7)
Fluid Phase Equilibria     Hybrid Journal   (Followers: 1)
Focus on Catalysts     Full-text available via subscription  
Focus on Pigments     Full-text available via subscription   (Followers: 4)
Focus on Powder Coatings     Full-text available via subscription   (Followers: 3)
Focus on Surfactants     Full-text available via subscription   (Followers: 3)
Food Engineering Reviews     Hybrid Journal   (Followers: 2)
Formación Universitaria     Open Access   (Followers: 3)
FORMakademisk     Open Access  
Formal Methods in System Design     Hybrid Journal   (Followers: 6)
Forschung     Hybrid Journal  
Forschung im Ingenieurwesen     Hybrid Journal  
Foundations and Trends in Systems and Control     Full-text available via subscription  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 5)
Foundations and Trends® in Electronic Design Automation     Full-text available via subscription  
Foundations of Science     Hybrid Journal  
Frontiers in Aerospace Engineering     Open Access   (Followers: 3)
Frontiers in Energy     Hybrid Journal   (Followers: 2)

  First | 1 2 3 4 5 6 7 8 | Last

Engineering Journal
   [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 0125-8281 - ISSN (Online) 0125-8281
     Published by Chulalongkorn University Homepage  [2 journals]   [SJR: 0.153]   [H-I: 3]
  • An Energy Analysis of a Slab Preheating Chamber for a Reheating Furnace

    • Authors: Kitipong Kangvanskol, Chittin Tangthieng
      Abstract: The iron and steel industry is one of the major industries for developing countries, and it is ranked as one of the industrial sectors that has the highest energy consumption. It is also served as a primary industry that provides materials to secondary industries as well. This present study focuses on a slab, a product from a steelmaking process, which will be sent to a hot-rolling mill to form a final product. Before the rolling process, slab is heated to a proper temperature by charging into a reheating furnace. Heat is generated by a combustion process from direct-fired burners. In general, heat loss from the reheating furnace occurs by several mechanisms including the flue gas loss. Although a recuperator is used to reduce heat loss by recovering some of that to preheat the combustion air, the exit flue gas temperature is still as high as 350-450C. This research paper aims for the investigation of the energy efficiency resulted from the implementation of a slab preheating chamber before charging into a reheating furnace. Four different sizes of the preheating chamber are selected as the case studies for the energy analysis. Another consideration includes the acid dew point of the flue gas as the lowest criteria for the flue gas temperature. The result indicates that the flue gas temperatures are above the acid dew point for all four cases under consideration. The slab temperatures increase from the ambient temperature of 30oC to 59.52oC, 75.98oC, 84.98oC and 89.46oC, respectively, before begin charged into the reheating furnace. As a result, the fuel energy consumption after the implementation of the reheating chamber is reduced by 0.94%, 1.46%, 1.75% and 1.89%, respectively comparing to the furnace without the reheating chamber. The reheating furnace efficiency also increases from 69.88% to 70.54%, 70.92%, 71.13% and 71.22%, respectively.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Systematic Approach to Arowana Gender Identification Problem using
           Algorithm of Inventive Problem Solving (ARIZ)

    • Authors: Trizit Benjaboonyazit
      Abstract: This paper presents a systematic approach to arowana gender identification problem using algorithm of inventive problem solving (ARIZ). Arowana is a beautiful and expensive fish. Many farms try to improve their efficiency in breeding arowana, but the problem is that arowana is monomorphic, which makes it difficult to distinguish male from female just from their appearance. This causes difficulties in mating and selling of arowana. Many trial-and-error methods have been used with little success. The problem of arowana gender identification cannot be solved easily with the psychological methods such as brainstorming or trial and error, it needs a more logical and well-structured method of problem solving. In this paper, ARIZ is used to systematically analyze the problem and search for possibilities to identify the gender of arowana step by step, and finally, among 32 ideas generated, some potential solutions have been evaluated and compared with the commonly used methods with satisfactory results which demonstrate the effectiveness of ARIZ as a powerful innovative problem solving tool.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Synthesis Acetylation of Glycerol Using Batch Reactor and Continuous
           Reactive Distillation Column

    • Authors: Zahrul Mufrodi, Rochmadi Rochmadi, Sutijan Sutijan, Arief Budiman
      Abstract: Biodiesel production from vegetable oil produces glycerol as by-product with the amount of about 10 wt% of its product. This excessive amount of glycerol needs to be converted into the higher valuable product. One of the prospective glycerol’s derivatives is triacetin, a good bio-additive as anti-knocking agent. The synthesis of triacetin from glycerol and acetic acid using sulfuric acid catalyst has been performed in batch and continuous process. In this work, triacetin was synthesized using batch reactor to give 96.30% of glycerol conversion and 20.50% of triacetin selectivity. Meanwhile, the production using continuous reactive distillation resulted in glycerol conversion of 98.51% and 8.84% of triacetin selectivity.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Modeling and Experimentation Study of Earth to Air Heat Exchanger

    • Authors: Foued Chabane, Nesrine Hatraf, Abdelhafid Brima, Noureddine Moummi, Abdelhafid Moummi
      Abstract: Geothermal energy uses an air ground exchanger to cool buildings with minimum of energy. The outlet air coming from this exchanger can be directly used for space cooling if its temperature is low enough. In this study we try to evaluate the profile of ground temperature to decide of the depth to bury the exchanger. Through modeling and experimentation, we try to evaluate the performance of a horizontal pipe used for cooling, for this finite differential method which consists on dividing the length of the exchanger on multiple equal segments and by the knowledge of initial and boundary conditions the profile of the air temperature is that carry out. The authors conclude that many parameters influence the performance of earth to air exchanger such as the nature of the ground, the ground depth diameter of the duct and the throughput flow.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • An Investigation on the Thermal Characteristics of a Single-Effect
           Absorption Chiller Subjected to the Input Steam Fluctuation

    • Authors: Taninrat Vittayakaisin, Chittin Tangthieng
      Abstract: This paper presents an investigation on the thermal characteristics of a single-effect absorption chiller subjected to the input steam fluctuation for an air-conditioning purpose. The absorption chiller driven by waste steam is utilized with the total capacity of 270 tons. The analyzed data are obtained by the field measurement. The results indicate that most measuring parameters appear to be nearly constant with time whereas the chilled water outlet temperature and the cooling water outlet temperature appear to have a similar wave characteristic to the mass flow rate of the input steam. The regression analysis is performed in order to obtain the sine function of these three parameters. The lagging behavior of the cooling load and the rejected heat rate behind the input heat rate from waste steam is observed due to the thermal inertia of the absorption chiller. The energy analysis shows that the average cooling load, rejected heat rate and input heat rate from waste steam is 345.78 kW, 1033.80 kW, 572.88 kW, respectively. The coefficient of performance of the absorption chiller has a high fluctuation from 0.296 to 1.524 with an average value of 0.754, resulted from the fluctuation of the mass flow rate of the input steam. The result indicates that the average value of the residual heat rate is 170.14 kW, which is approximately 10 percent of the total input heat.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Oxygen Specific Power Consumption Comparison for Air Separation Units

    • Authors: Yas A. Alsultannty, Nayef N. Al-Shammari
      Abstract: Technologies life cycles became shorter than before as a result of globalization and open market, which derived organizations to update their dated technologies. Without technologies updating, which based on Technological Forecasting (TF), organizations can not be dominant leaders in the open market and eventually they will lose their business. The main objective of this paper was to evaluate the air separation units by calculating the oxygen specific power, to find the most cost effective unit. The oxygen specific power used as a Key Performance Indicator (KPI) for the selected Air Separation Unit (ASU) technologies. The KPI for the updated Air Separation Unit was reviewed and the latest value selected as theoretical benchmark, which was 0.28Kw/Nm3. At the practical part, the data collected to three air separation units ASU-31, ASU-51 and ASU-71. The results showed that the specific power gaps that used as the KPI's of ASU-31, ASU-51 and ASU-71 are 0.464Kw/Nm3, 0.639Kw/Nm3 and 0.631Kw/Nm3 respectively. The results showed that these gaps can be minimized by the recommendation suggested in this paper to reduce power consumption.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Substrate Temperature Effect on Optical property of ZnO Thin Films

    • Authors: Achour Rahal, Said Benramache, Boubaker Benhaoua
      Abstract: The transparent conducting ZnO thin films were deposited on glass substrate by ultrasonic spray technique. The optical, electrical and structural properties of the ZnO thin films were studied as a function of the substrate temperatures in the range of 300 to 400 °C. The as deposited film exhibit an hexagonal structure wurtzite and (101) oriented. The value of grain size = 28 nm is measured of ZnO film at 350 °C. All the films having high transparency in the visible region, the band gap energy decreased from 3.44 to 3.29 eV with increasing in the substrate temperatures from 300 to 400 °C. The the Urbach energy decreased reaching to minimum at 350 °C; indicating to decrease of the defects. The electrical resistivity of the films for 350 °C is 50 Ω.cm. A systematic study on the influence of the substrate temperatures on the properties of ZnO thin films deposited by ultrasonic spray has been reported.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Simulation Techniques for Determining Numbers of Programmers in the
           Process of Software Testing

    • Authors: Adtha Lawanna
      Abstract: One of the existing problems in the body knowledge of software engineering is inappropriate numbers of programmers working through the software-development life cycle, particularly in the process of coding, testing, and maintenance. If the numbers are large, then the cost of development software will increase. However, the small teams cause another problem, especially in the process of deployment. Therefore, this article presents the simulation techniques for the development team in order to determine the appropriate numbers of programmer, specifically in the process of software testing, including the percent errors that can be occurred during maintenance. Firstly, the relationship among programmers, codes, and testing time are constructed and studied. Secondly, it is the application based simulation techniques for determining the suitable numbers of programmers whereas twenty experiments are organized. Lastly, the percent errors from seeded bugs are generated by 50 experiments. The contribution of this paper is not only managing the whole phases of software-development life cycle, but it also guarantees the accuracy of testing software by improving the percent errors.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Application of Vector Control to Permanent Magnet Synchronous Motors Using
           Chaos Control

    • Authors: Elham Hezare, Mohammad Ataei, Mehrdad Jafarboland
      Abstract: This paper presents the idea of vector control for permanent magnet synchronous motor (PMSM) based on chaos theorem, using chaos controller. PMSM will demonstrate chaotic phenomena when its parameters fall into a certain area. To achieve this aim, the sub-system of controller has been designed by considering block diagram structure of vector control for PMSM and by applying the setting of Lyapunov exponents method. Also, asymptotical stability of closed loop system with given controller is shown, using the direct Lyapunov method. The performance of designed controller in chaotic mode is compared with conventional vector control methods. Also, the normal mode for PMSM is considered and the performance of controller is compared. Simulation results indicate that not only does this controller eliminate the chaos in chaotic mode and have good performance but also is able to control the system in normal mode by using almost the smaller control signal effort.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Green Drying: Continuous Dehumidified-Air Dryer

    • Authors: C. L. Woo, H. S. Yeoh, S. K. Go, Gun Hean Chong
      Abstract: Non-thermal drying, such as dehumidified-air drying has been introduced to overcome the drawbacks of conventional thermal and direct contact adsorption drying. However, existing approach of this method is not so user friendly as the dehumidified-air cannot be supplied continuously due to the depletion of desiccants. The desiccants also need a high temperature for the regeneration. Therefore, a continuous dehumidified-air dryer is focused in this study. The dehumidified-air was produced alternately by adsorbents, which located in two chambers. The adsorbents were then regenerated at ambient temperature by pressure-swing concepts. This continuous dehumidified-dryer was commissioned by drying A. paniculata, at the dehumidified-air 10 to 30 L/min and 30 to 50 C. The sample was dried at less than 10 hours, and about 75 % of andrographolide had been maintained. The Page model was well describing the drying behaviour, and the diffusivity coefficient was determined as 1.88 x 10-13 m2/s.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • Particle Packing Approach for Designing the Mortar Phase of Self
           Compacting Concrete

    • Authors: Abibasheer Basheerudeen, Sivakumar Anandan
      Abstract: Self Compacting Concrete (SCC) is a tailored concrete mix, strongly dependent on the constituent proportions and the physical characteristics of the constituents. In order to achieve the self compacting concrete, mortar phase plays a vital role as it contributes to the active suspension phase of aggregates. High powder content and optimum fine aggregate is required for the desired flowability and stability of mortar. Hence, for accomplishing a self compacting concrete, the design of paste and mortar phase needs to be carefully proportioned. A positive correlation exists between the flow properties of the concrete and the packing density of the mix. The packing density of the cementitious materials plays a key role in deciding the final strength of concrete. Improved packing offers the benefit of reduction in water demand, reduced permeability, reduction in bleeding and reduced porosity of the transition zone. The objective of this study is to design the mortar phase for a self compacting concrete reinforced with glass fibres by applying the concept of particle packing. Design of paste and mortar phase was done based on particle packing approach using Puntke test. Initially the powder content (cement and slag) was arrived based on Puntke test and the optimum addition of slag was determined with the slag activity index. The super plasticizer dosage was fixed by performing flow studies using Marsh cone test and the fine aggregate content was established by Puntke Test. The selected powder to fine aggregate content established by particle packing method was taken for mini slump studies and further the optimization of glass fibres content is determined. The outcome of the current study exposed the possibility of obtaining a self compacting mortar incorporating glass fibres which in turn useful for designing the self-compacting concrete.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
  • A Study of Competitiveness between Low Cost Airlines and High-Speed-Rail:
           A Case Study of Southern Corridor in Thailand

    • Authors: Piti Chantruthai, Sirirat Taneerananon, Pichai Taneerananon
      Abstract: This paper investigates the competitiveness between Low Cost Airlines (LCA) and High Speed Rail (HSR) on the southern corridor where LCA predominate at present. A study of passengers’ O-D pairs in southern corridor of Thailand was conducted. The O-D surveys were carried out for the 2 sections of the southern corridor: Surat Thani-Bangkok (ST-BKK) and Hat-Yai –Bangkok (HY-BKK). The competitiveness between HSR and LCA and the Willing-To-Pay for the HSR fare were analysed using factors determined by the multinomial logistic regression model and binary logistic regression model, respectively. Competitiveness between HSR and LCA did not depend only on travel time alone but also on factors such as fare difference, users’occupation, household income, education level and trip purposes.The result of the Willingness-To-Pay for the HSR fare showed the fare for O-D pairs between ST-BKK and HY-BKK at 1.8 THB/km (US$ 0.06/km) and 1.5 THB/km (US$ 0.05/km), respectively. The average HSR fare was 1.65 THB/km (US$ 0.055/km). This is in comparison to the fare of HY-BKK 2.45 THB/km (US$ 0.08/km) for a LCA, and an average of 2.65 THB/km (US$ 0.09/km) for another LCA. It is seen that the fare differential of 1 THB/km (US$ 0.03/km) could be significant in making passengers change from LCA to HSR.
      PubDate: 2014-04-18
      Issue No: Vol. 18 (2014)
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