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Chiang Mai, Thailand

Maejo University in Chiang Mai Province, Thailand, is the oldest agricultural institution in the country. Founded in 1934 as the Northern Agricultural Teachers Training School, it was restructured and renamed several times until it gained the status of a full-fledged public university in 1996 and since then has been known as Maejo University.Maejo University main campus at Chiang Mai is composed of the faculties of Business, Economics, Liberal Arts, Tourism Development, Information Technology, Fisheries Technology and Aquatic Resources, Animal science and Technology, Renewable Energy, Administrative, Landscape and Environmental Design, Agricultural Production, Science, and Engineering and Agro-Industry. In addition to these, the university has two smaller campuses in Phrae and Chumphon. Wikipedia.


Chaiyat N.,Maejo University
Energy Conversion and Management | Year: 2015

In this study, a concept of using phase change material (PCM) for improving cooling efficiency of an air-conditioner had been presented under Thailand climate. Rubitherm20 (RT-20) was selected to evaluate the thermal performance by reducing the air temperature entering the evaporating coil. The model of PCM celluloid balls had been performed with the air-conditioner. For the experiment, 2 TR of R-134a air-conditioner was chosen to test a pack bed of PCM balls with thickness 40 cm. The pressure drops of the air flowing through the bed were considered with and without a set of by-pass tubes along the height of the storage bed. The mathematical model of the air-conditioner with the PCM storage was developed and verified with the testing results. From the study results, it could be seen that pressure drops of the bed with and without bypass tubes were nearly the same results. Thus, PCM ball pack bed using RT-20 without bypass tubes was used to improve the cooling efficiency of the air-conditioner. The experimental result of the modified unit was compared and verified with the mathematical model, which agreed quite well with the simulation result. Finally, the model was used to analyze the economic result, which found that the electrical consumption of the modified air-conditioner could be decreased around 3.09 kW h/d. The saving cost from the PCM bed could be 9.10% of 170.03 USD/y and the payback period was around 4.15 y. © 2015 Elsevier Ltd. All rights reserved. Source


Rajchakit G.,Maejo University
International Journal of Nonlinear Sciences and Numerical Simulation | Year: 2013

This paper is concerned with asymptotic stability and stabilization of nonlinear uncertain stochastic switched discrete time-delay systems. The system to be considered is subject to interval time-varying delays, which allows the delay to be a fast time-varying function and the lower bound is not restricted to zero. Based on the discrete Lyapunov functional, a switching rule for the asymptotic stability and stabilization for the nonlinear uncertain stochastic discrete time-delay system is designed via linear matrix inequalities. Numerical examples are included to illustrate the effectiveness of the results. Source


Rajchakit G.,Maejo University
Applied Mathematics and Information Sciences | Year: 2012

This paper is concerned with robust stability and stabilization of nonlinear uncertain stochastic switched discrete time-delay systems. The system to be considered is subject to interval time-varying delays, which allows the delay to be a fast time-varying function and the lower bound is not restricted to zero. Based on the discrete Lyapunov functional, a switching rule for the robust stability and stabilization for the nonlinear uncertain stochastic discrete time-delay system is designed via linear matrix inequalities. Numerical examples are included to illustrate the effectiveness of the results. © 2012 NSP Natural Sciences Publishing Cor. Source


Rajchakit G.,Maejo University
2012 IEEE International Conference on Robotics and Biomimetics, ROBIO 2012 - Conference Digest | Year: 2012

This paper is concerned with exponential stability of switched linear systems with interval time-varying delays. The time delay is any continuous function belonging to a given interval. By constructing a suitable augmented Lyapunov-Krasovskii functional combined with Leibniz-Newton's formula, a switching rule for the exponential stability of switched linear systems with interval time-varying delays and new delay-dependent sufficient conditions for the exponential stability of the systems are first established in terms of LMIs. Numerical example is included to illustrate the effectiveness of the results. © 2012 IEEE. Source


Thirabunyanon M.,Maejo University
Maejo International Journal of Science and Technology | Year: 2011

The microbiota in the human intestine play an important function in human health and disease. Gastrointestinal infections by foodborne pathogens are a main cause of morbidity and mortality worldwide. Such infections can be caused by contaminated foods or other sources which come in contact with human intestinal epithelial cells. In recent years, probiotics have been recommended as alternative biotherapeutic agents against intestinal pathogenic infections. Two genera of probiotics, Lactobacillus and Bifidobacterium, are commercially valuable applications, several forms of which are available as capsules or in functional food products such as yogurt, fermented juices and sausages. Probiotics protect against gastrointestinal pathogenic infection via several mechanisms. These include production of antimicrobial substances, competition for nutrient substrates, competitive exclusion, enhancement of intestinal barrier function, and immunomodulation. Probiotic bacteria have been documented as being effective in biotherapeutic applications against gastrointestinal pathogens, e.g. Helicobacter pylori, Salmonella, Escherichia coli, Listeria monocytogenes, and rotaviruses. This alternative therapeutic application of probiotics to protect against gastrointestinal pathogenic infections may be of great importance for future medicinal use. © 2011 by Maejo University, San Sai, Chiang Mai, 50290 Thailand. Source

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