Chiang Mai, Thailand

Chiang Mai Rajabhat University
Chiang Mai, Thailand

Chiang Mai Rajabhat University is a university in the north of Thailand. It is under the Royal Thai Ministry of Education. The university was founded in 1924 as an agricultural teacher training college. In 1948, it became Chiang Mai Teachers College and offered majors in a variety of subjects. On February 14, 1982, the year of King Rama IX's sixtieth birthday, His Majesty proclaimed Thailand's 36 teacher's colleges to be Rajabhat Institutes; they then began offering majors and degree programmes in non-teaching fields. On March 6, 1985, His Majesty the King graciously granted the use of his royal crest as the Rajabhat Institute emblem. Rajabhat Institute Chiang Mai became Chiang Mai Rajabhat University in 2004.Enrolment is about 30,000, and classes are divided into regular, evening and weekends. Most students come from secondary schools in northern Thailand, some even from remote areas. Chiang Mai Rajabhat University is thus a community institute which provides a comprehensive education for local students and working people.There are five faculties, one graduate school, one international college and one autonomous institute, employing about 500 faculty members.There are four campuses:Wieng Boa, the main campus, is on Chang Puek Road, in the center of Chiang Mai.Mae Sa, the campus of Faculty of Management Science, is in Mae Rim District, 10 kilometers from Chiang Mai.Sa Luang , campus of the Agricultural Center, is in Mae Rim District, 27 kilometers from Chiang Mai.Mae Hong Son campus, in Mae Hong Son, is the center for external services in education. Wikipedia.

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Denoeux T.,CNRS Heuristic and Diagnostic Methods for Complex Systems | Kanjanatarakul O.,Chiang Mai Rajabhat University
Advances in Intelligent Systems and Computing | Year: 2017

In evidential clustering, uncertainty about the assignment of objects to clusters is represented by Dempster-Shafer mass functions. The resulting clustering structure, called a credal partition, is shown to be more general than hard, fuzzy, possibility and rough partitions, which are recovered as special cases. Different algorithms to generate a credal partition are reviewed. We also describe different ways in which a credal partition, such as produced by the EVCLUS or ECM algorithms, can be summarized into any of the simpler clustering structures. © Springer International Publishing Switzerland 2017.

Maithong W.,Chiang Mai Rajabhat University | Phao-Ai P.,Chiang Mai Rajabhat University
AIP Conference Proceedings | Year: 2017

In this work, we studied about the period change of a contact binary system RW Comae Berenices. The binary system was observed on March 9th, 2016 by the 105 mm diameter of a refraction telescope with the DSLR digital camera at the Regional Observatory for the Public Nakhon Ratchasima, Thailand. The photometry used the IRIS program. The period change was analyzed by used the O-C diagram. The result shows that the period of the RW Comae Berenices is increasing with 1.89×10-3 seconds/year. © 2017 Author(s).

Kruea-In C.,Chiang Mai Rajabhat University | Rujijanagul G.,Chiang Mai University
Journal of Nanoscience and Nanotechnology | Year: 2017

The properties of the solid solution (1 − x)BZT05–xBFT were investigated. All samples showed a pure perovskite phase indicating a high solubility limit of BFT in BZT. For x ≥ 01, the samples exhibited strong dielectric-frequency dispersion. Increasing BFT enhanced the dielectric constant and the degree of dielectric-frequency dispersion. Very high dielectric constants (>35,000 at 1 kHz) were observed for the x ≥ 05 samples at temperatures >150 C. An obvious change in dielectric behavior was found for the modified sample (x ≥ 0.1). By using the complex impedance spectroscopy, the dielectric behaviour could be explaned in terms of Maxwell–Wagner polarization due to the heterogeneous conduction of the modified samples. The ferroelectric properties of the x >0.1 samples also presented a large change as compared to the unmodified sample due to these samples had higher leakage current. Copyright © 2017 American Scientific Publishers All rights reserved.

SOMMANEE W.,Chiang Mai Rajabhat University | SANGKHANAN K.,Chiang Mai University
Journal of the Australian Mathematical Society | Year: 2017

Let (Formula presented.) be a vector space and let (Formula presented.) denote the semigroup (under composition) of all linear transformations from (Formula presented.) into (Formula presented.). For a fixed subspace (Formula presented.) of (Formula presented.), let (Formula presented.) be the semigroup consisting of all linear transformations from (Formula presented.) into (Formula presented.). In 2008, Sullivan [‘Semigroups of linear transformations with restricted range’, Bull. Aust. Math. Soc. 77(3) (2008), 441–453] proved that(Formula presented.) is the largest regular subsemigroup of (Formula presented.) and characterized Green’s relations on (Formula presented.). In this paper, we determine all the maximal regular subsemigroups of (Formula presented.) when (Formula presented.) is a finite-dimensional subspace of (Formula presented.) over a finite field. Moreover, we compute the rank and idempotent rank of (Formula presented.) when (Formula presented.) is an (Formula presented.)-dimensional subspace of an (Formula presented.)-dimensional vector space (Formula presented.) over a finite field (Formula presented.). © 2017 Australian Mathematical Publishing Association Inc.

Lin L.,Jiangsu University | Cunshan Z.,Zhejiang Agriculture And forestry University | Vittayapadung S.,Chiang Mai Rajabhat University | Xiangqian S.,Jiangsu University | Mingdong D.,University of Aarhus
Applied Energy | Year: 2011

Fossil fuel resources are decreasing daily. As a renewable energy, biodiesel has been receiving increasing attention because of the relevance it gains from the rising petroleum price and its environmental advantages. This review highlights some of the perspectives for the biodiesel industry to thrive as an alternative fuel, while discussing opportunities and challenges of biodiesel. This review is divided in three parts. First overview is given on developments of biodiesel in past and present, especially for the different feedstocks and the conversion technologies of biodiesel industry. More specifically, an overview is given on possible environmental and social impacts associated with biodiesel production, such as food security, land change and water source. Further emphasis is given on the need for government's incentives and public awareness for the use and benefits of biodiesel, while promoting policies that will not only endorse the industry, but also promote effective land management. © 2010 Elsevier Ltd.

Kanjanatarakul O.,Chiang Mai Rajabhat University | Sriboonchitta S.,Chiang Mai University | Denoeux T.,CNRS Heuristic and Diagnostic Methods for Complex Systems
International Journal of Approximate Reasoning | Year: 2014

A method is proposed to quantify uncertainty on statistical forecasts using the formalism of belief functions. The approach is based on two steps. In the estimation step, a belief function on the parameter space is constructed from the normalized likelihood given the observed data. In the prediction step, the variable Y to be forecasted is written as a function of the parameter θ and an auxiliary random variable Z with known distribution not depending on the parameter, a model initially proposed by Dempster for statistical inference. Propagating beliefs about θ and Z through this model yields a predictive belief function on Y. The method is demonstrated on the problem of forecasting innovation diffusion using the Bass model, yielding a belief function on the number of adopters of an innovation in some future time period, based on past adoption data. © 2014 Elsevier B.V. All rights reserved.

Pramukkul P.,University of North Texas | Pramukkul P.,Chiang Mai Rajabhat University | Svenkeson A.,University of North Texas | Grigolini P.,University of North Texas
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2014

We study the combined effects of noise and detector sensitivity on a dynamical process that generates intermittent events mimicking the behavior of complex systems. By varying the sensitivity level of the detector we move between two forms of complexity, from inverse power law to Mittag-Leffler interevent time survival probabilities. Here fluctuations fight against complexity, causing an exponential truncation to the survival probability. We show that fluctuations of relatively weak intensity have a strong effect on the generation of Mittag-Leffler complexity, providing a reason why stretched exponentials are frequently found in nature. Our results afford a more unified picture of complexity resting on the Mittag-Leffler function and encompassing the standard inverse power law definition. © 2014 American Physical Society.

Kruea-In C.,Chiang Mai Rajabhat University | Rujijanagul G.,Chiang Mai University | Zhu F.Y.,University of Leeds | Milne S.J.,University of Leeds
Applied Physics Letters | Year: 2012

Dielectric properties of (1 - x)K 0.5Bi 0.5TiO 3 - xBiScO 3 ceramics have been studied for compositions x < 0.5. Single-phase solid solutions occurred for compositions x < 0.25. A frequency-dependent dielectric relaxation was observed, consistent with relaxor behaviour. This gave rise to a relatively stable dielectric permittivity at high temperatures, for example, r 2880 ± 3, between temperatures of 500 and 700 K (1 kHz) for composition x = 0.15. This consistency in relative permittivity occurs at higher temperatures than for other lead-free dielectrics. Parameters from Vogel-Fulcher analysis are compared to other relaxors. © 2012 American Institute of Physics.

Intapong S.,Chiang Mai Rajabhat University | Raksudjarit A.,Chiang Mai Rajabhat University
Advanced Materials Research | Year: 2013

Porous ceramics filter was prepared by sintering of hydroxyapatite (HA) and silica composite nanopowder. Silica nanopowder of 50 wt% are incorporated into HA nanopowder. The mixing powders are uniaxially compact and then sintering at 900°C-1050°C in air. The characterization of the porous was carried out by scanning electron microscopy (SEM). Filtration studies using porous ceramic were performed for agricultural wastewater. The studies of the water filtration and flow through these porous showed that the sintered ceramic filter at all temperatures reduced the TDS, TS, conductivity, and arsenic (As) content. The water permeated through porous ceramic composites could be compared to drinking water quality. © (2013) Trans Tech Publications, Switzerland.

Rujijanagul G.,Chiang Mai University | Kruea-In C.,Chiang Mai Rajabhat University
Electronic Materials Letters | Year: 2013

Solid solutions of the (1-x)Ba(Zr0.07Ti0.93)O3-xBa((Ni0.5W0.5)0.1Ti0.9)O3 system with 0.05 ≤ x ≤ 0.2, were fabricated via a solid-state reaction technique. All samples exhibited a pure phase perovskite structure. The x = 0.05 samples exhibited very high dielectric constants (>60,000) for temperatures over 400°C, while the x = 2.0 samples had a higher degree of dielectric constant stability over a wide temperature range. The ceramics also showed a dielectric relaxor behavior. The frequency dependence of the loss tangent peak was observed to follow an Arrhenius law where the activation energies increased with increasing Ba((Ni0.5W0.5)0.1Ti0.9)O3 content. The result suggests that the addition of Ba((Ni0.5W0.5)0.1Ti0.9)O3 has strong effects on the properties this ceramic system. © 2013 The Korean Institute of Metals and Materials and Springer Science+Business Media Dordrecht.

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