Phitsanulok, Thailand
Phitsanulok, Thailand

Naresuan University is a government sponsored university in Phitsanulok, northern Thailand. It was established as a separate university on July 29, 1990, which was the 400th anniversary of the start of the reign of Phitsanulok-born King Naresuan the Great. A courtyard with a statue of King Naresuan is located on the grounds and the students regularly pay their respects before it. The university has about 20,000 full-time students. Wikipedia.

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de Felice A.,Naresuan University | Mukohyama S.,University of Tokyo
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2014

We present the first example of a unitary theory of Lorentz-invariant massive gravity, with all degrees of freedom propagating on a strictly homogeneous and isotropic, self-accelerating de Sitter background. The theory is a simple extension of the quasidilaton theory, respecting the symmetry of the original theory but allowing for a new type of coupling between the massive graviton and the quasidilaton scalar. © 2013 The Authors. Published by Elsevier B.V.

Defelice A.,Naresuan University | Gumrukcuoglu A.E.,University of Tokyo | Mukohyama S.,University of Tokyo
Physical Review Letters | Year: 2012

We argue that all homogeneous and isotropic solutions in nonlinear massive gravity are unstable. For this purpose, we study the propagating modes on a Bianchi type-I manifold. We analyze their kinetic terms and dispersion relations as the background manifold approaches the homogeneous and isotropic limit. We show that in this limit, at least one ghost always exists and that its frequency tends to vanish for large scales, meaning that it cannot be integrated out from the low energy effective theory. This ghost mode is interpreted as a leading nonlinear perturbation around a homogeneous and isotropic background. © 2012 American Physical Society.

Taechasubamorn P.,Naresuan University
Journal of the Medical Association of Thailand = Chotmaihet thangphaet | Year: 2011

To determine the prevalence of low back pain (LBP) among rice farmers in a rural community in Phitsanulok, Thailand. A cross-sectional survey was conducted among 283 rice farmers in Wangnamkhu subdistrict, Muang district, Phitsanulok province, a rural community in Lower Northern Thailand. Face-to-face interviews with a structured closed-end questionnaire were performed to collect information on the presence of LBP in lifetime, within the last 12 months prior to and at the time of the present study. The lifetime, 1-year (12-month) and point prevalence rates of LBP were 77%, 56% and 49%, respectively. No relationship between age and LBP was found. However women (61%) had significantly greater 1-year prevalence than men (51%). Ninety-five percent of LBP rice farmers were chronic (experiencing pain longer than 12 weeks) with a mean duration of 292 weeks (5.6 years). The prevalence of LBP among Thai rice farmers is high. Further research should investigate risk factors among this group of the population to design appropriate preventive measures.

Kaomongkolgit R.,Naresuan University
Journal of Drugs in Dermatology | Year: 2010

Oral lichen planus and oral lichenoid drug reactions have similar clinical and histologic findings. The onset of oral lichenoid drug reactions appears to correspond to the administration of medications, especially antihypertensive drugs, oral hypoglycemic drugs, antimalarial drugs, gold salts, penicillamine and others. The author reports the case of 58-year-old male patient with oral lichenoid drug reaction, hypertension and diabetes mellitus. The oral manifestation showed radiated white lines with erythematous and erosive areas. The patient experienced pain and a burning sensation when eating spicy food. A tissue biopsy was carried out and revealed the characteristics of lichen planus. The patient was treated with 0.1% fluocinolone acetonide in an orabase as well as the replacement of the oral hypoglycemic and antihypertensive agents. The lesions improved and the burning sensation disappeared in two weeks after treatment. No recurrence was observed in the follow-up after three months. © 2010-Journal of Drugs in Dermatology. All Rights Reserved.

Takeuchi S.,Naresuan University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2015

Based on the Unruh effect, we calculate the critical acceleration of the Bose-Einstein condensation in a free complex scalar field at finite density in the Rindler space. Our model corresponds to an ideal gas performing constantly accelerating motion in a Minkowski space-time at zero-temperature, where the gas is composed of the complex scalar particles and it can be thought to be in a thermal-bath with the Unruh temperature. In the accelerating frame, the model will be in the Bose-Einstein condensation state at low acceleration; on the other hand, there will be no condensation at high acceleration by the thermal excitation brought into by the Unruh effect. Our critical acceleration is the one at which the Bose-Einstein condensation begins to appear in the accelerating frame when we decrease the acceleration gradually. To carry out the calculation, we assume that the critical acceleration is much larger than the mass of the particle. © 2015 The Author.

Promma K.,Naresuan University
Journal of Hydrology | Year: 2010

Most analytical solutions for contaminant transport in groundwater require numerical integration, which can be difficult to apply in spreadsheets. The Domenico solution provides an approximate solution without the integral term for a planar source oriented normal to the direction of groundwater flow. In this paper, the Domenico solution is extended to a prism source by considering off-domain contaminant transport. The source was lengthened by using the ratio between longitudinal and horizontal transverse hydrodynamic dispersion coefficients and source thickness by using the ratio between vertical velocity of source loading and longitudinal velocity of contaminant transport. The modified Domenico solution was tested against previous exact solutions. Results show that the modified Domenico solution simulates higher contaminant concentrations near the source and in the bottom of the domain than the Domenico solution but yields similar plumes to the exact solutions. The modified Domenico solution provides quick estimation of the plume length and concentrations and is convenient for testing the response of plume length and concentrations to measurable input parameters when a three-dimensional representation of the source is important. © 2010 Elsevier B.V.

Manoukian E.B.,Naresuan University
Radiation Physics and Chemistry | Year: 2015

Using the fact that the vacuum-to-vacuum transition probability for the interaction of the Maxwell field Aμ (x) with a given current Jμ (x) represents the probability of no photons emitted by the current of a Poisson distribution, the average number of photons emitted of given energies for the underlying distribution is readily derived. From this the classical power of radiation of Schwinger of a relativistic charged particle follows. © 2014 Elsevier Ltd.

The purpose of this study was to investigate the effect of alpha-mangostin on matrix metalloproteinase (MMP)-2 and MMP-9 expression in head and neck squamous cell carcinoma (HNSCC). The human HNSCC cell lines were treated with alpha-mangostin and the cytotoxicity of alpha-mangostin in HNSCC was determined using the MTS assay. To determine the effect of alpha-mangostin on the expression of MMP-2 and MMP-9 in HNSCC, gelatin zymography and RT-PCR were performed. The results showed that alpha-mangostin increased in growth inhibition of HNSCC cell lines in a concentration-dependent manner. Treatment with alpha-mangostin decreased MMP-2 and MMP-9 expression in a concentration-dependent manner in all cell lines. These findings suggested that alpha-mangostin might be a potential therapeutic agent for HNSCC. © 2012 The Society of The Nippon Dental University.

Biomass plays an important role as renewable energy resource for electricity generation and biofuel. It is necessary to study the commercial biomass in 9 provinces of the northern region of Thailand. Information on the status of biomass utilization was applied from biomass fuel project management that approach to the use of renewable energy in macrolevel. The study presents that there is low potential of biofuel in this region. Then, explore the cost of raw fuel, collection and processing cost, transportation costs, electricity prices, prices of agricultural products, price level of agricultural waste, fuel prices, employment and the business of producing biomass energy. After that developed a mathematical model is needed to present the impact of the expansion of the production of biomass to changes in economic variables, using the regression model to plan and manage the forecasts. The study of carbon dioxide emissions using the calculations of Annex 12 Methodological tool (version 01.1) "Tool to calculate the emission factor for an electricity system" and create a database, which is the concept of business strategy for new economic era. This is a practical guide to implementing an effective supply chain management for biomass in the lower northern region of Thailand. © 2011 Published by Elsevier Ltd.

Nuengchamnong N.,Regional Medical science Center Phitsanulok | Ingkaninan K.,Naresuan University
Food Chemistry | Year: 2010

A reversed phase high performance liquid chromatography (RP-HPLC) separation coupled with an electrospray ionisation mass spectrometry detection (ESI-MS) and the 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay was used for the screening of multiple antioxidant compounds in Antidesma thwaitesianum Muell. fruit wine. The active compounds were identified by comparison with authentic standards and published mass spectra. With the help of the multidimensional information of LC-ESI-MS/MS and DPPH assay, the compounds with different chemical structures could be determined in one run successfully. The antioxidant compounds were separated and identified as gallic acid, cyanidin-3-sophoroside, monogalloyl glucoside, delphinidin-3-sambubioside, catechin, caffeic acid, and pelargonidin-3-malonyl glucoside. This result shows that an on-line HPLC-MS-DPPH assay can be a powerful technique for the rapid characterisation of antioxidant compounds in plant extracts. © 2009 Elsevier Ltd. All rights reserved.

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