American Transactions on
Engineering & Applied Sciences
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  • :: Vol.1(2) (April 2012)


    :: American Transactions on Engineering & Applied Sciences
    ISSN 2229-1652
    eISSN 2229-1660


      The purpose of this paper is to understand how a capillary viscometer is able to measure the viscosity of a fluid, which equals time required to empty a given volume of liquid through an orifice. A fluid analysis was done on a capillary viscometer in order to derive equations to theoretically describe the viscometer. In addition, physical experiments were undertaken in order to correlate empirical data with theoretical models. Various fluids were tested and their corresponding times were recorded. Time readings were taken at two separate temperatures of 25oC and 100oC. The kinematic viscosity of a fluid is measured in Saybolt Universal Seconds (SUS), which is related to the kinematic viscosity of the tested fluid.

      Fuzzy Logic Modeling Approach for Risk Area Assessment for Hazardous Materials Transportation

      Sanya Namee, Boonsap Witchayangkoon (Department of Civil Engineering,Faculty of Engineering, Thammasat University, THAILAND ), and Ampol Karoonsoontawong (Department of Civil Engineering,Faculty of Engineering, King Mongkut’s University of Technology Thonburi, THAILAND

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      Keywords: Risk Area Assessment 

      The assessment of area in risk of HazMat transportation is very beneficial for the planning of the management of such area. We prioritized the affected area using HazMat-Risk Area Index (HazMatRAI) developed on the basis of Fuzzy Logic. The purpose of such development is to reduce limits of the criteria used for the assessment which we found exist when displaying data related to Hazmat represented by iceberg. In this regard, we categorized type of Membership Function according to Fuzzy set method in order to match the existing criteria, both solid and abstract ones. The conditions of Fuzzy Number and Characteristic are used respectively so that all risk levels are covered. However, the displaying of HazMat-Risk Area Index needs weighing of each criterion that is used for the assessment which significance of each level varies. We used Saaty’s Analytic Hierarchy Process (AHP) to establish weighing value obtained from such assessment. Therefore it is beneficial for the preparation of area with HazMatRAI value is high, hence proper preparation for the management in case of critical situation.

      Computer Modeling of Internal Pressure Autofrettage Process of a Thick-Walled Cylinder with the Bauschinger Effect

      Zhong Hu, and Sudhir Puttagunta (Department of Mechanical Engineering, South Dakota State University, USA ) 

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      Keywords: Thick-walled cylinder; Internal Pressurize; Autofrettage; Bauschinger effect; Finite Element Analysis 

      In this paper, the internally pressure overloading autofrettage process of a thick-walled cylinder has been numerically investigated. The corresponding axi-symmetric and plane-stress finite element model has been employed. The elasto-plastic material model with nonlinear strain-hardening and kinematic hardening (the Bauschinger effect) was adopted. The residual stresses in the thick-walled cylinder induced by internal autofrettage pressure have been investigated and optimized. The optimum autofrettage pressure and the maximum reduction percentage of the von Mises stress in the autofrettaged thick-walled cylinder under the elastic-limit working pressure have been found, the differences of stress and strain distribution between adopting the Bauschinger-effect and the non-Bauschinger-effect have been compared.

      Types of Media for Seeds Germination and Effect of BA on Mass Propagation of Nepenthes mirabilis Druce

      Anchalee Jala (Biotechnology Department, Faculty of Science and Technology, Thammasat University, Rangsit Campus, Phathumthani, THAILAND, 12121) 

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      Keywords: Vacin and Went (VW); Murashige and Skoog (MS); Nepenthes mirabilis; micropropagation 

      Nepenthes mirabilis Druce Seeds need light for their germination. The best medium for seeds germinated was half strength MS medium supplemented with 0.1 % activated charcoal. The organic substance such as coconut water, potato, and banana were not enhanced seed germinated. Shoot tip of N. mirabilis about 1 cm. long were cultured on half strength MS medium supplemented with 2.0 mg/l BA gave the best result in the highest average height of plant (1.3 cm). Half strength of MS medium supplemented with 1.0, 2.0, and 3.0 mg/l BA gave the same result in the highest average number of leaf per plant, leaf width, leaf length. But number of root and root length were not significant different in each concentration of BA. After cultured shoot tip in half strength MS medium supplemented with 2.0 mg/l BA for 20 weeks. It was found that the base of some shoots tip were formed the highest percentage of callus. The average number of new shoot tip (4.2 shoots) proliferated at the base of shoot tip which cultured in half strength MS medium contained with 2.0 mg/l BA also. 

      Numerical Analysis of Turbulent Diffusion Combustion in Porous Media

      Watit Pakdee (Department of Mechanical Engineering Faculty of Engineering, Thammasat University, THAILAND ) 

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      Keywords: Diffusion flame; Porous burner; Methane-air combustion 

      Turbulent methane-air combustion in porous burner is numerically investigated. Several computed field variables considered include temperature, stream function, and species mass fractions. The one-step reaction considered consists of 4 species. The analysis was done through a comparison with the gas-phase combustion. Porous combustion is found to level down the peak temperature while giving more uniform distribution throughout the domain. The porous combustion as in a burner is proved wider flame stability limits and can hold an extended range of firing capabilities due to an energy recirculation.

      Production of Hydrocarbons from Palm Oil over NiMo Catalyst

      Malee Santikunaporn, Sanankeam Ejaroj (Department of Chemical Engineering, Faculty of Engineering, Thammasat University, THAILAND ) 

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      Keywords: Palm oil; Deoxygenation; NiMo 

      Catalytic hydrodeoxygenation of palm oil in dodecane over NiMo/Al2O3 has been investigated in a 300mL Parr’s reactor. Triglycerides have been converted to hydrocarbons with various molecular sizes due to the compositions of fatty acids in palm oil. In this experiment, parameters of interest are temperature, pressure and turbine speed. Liquid samples were collected and analyzed by a gas chromatography (GC) to quantify desired hydrocarbon products (C15-C18) in the diesel range. It was found that the amount of desired products depends on the studied parameters. The conversion increases as the reaction temperature and a turbine speed increase, but the operating pressure decreases. In addition, the ratios of Cn/Cn-1 (C18/C17 and C16/C15) have been presented. 


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