• SUVANNABHUMI
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• v.1 no.2
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• pp.1-20
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• 2009

This research tries to review the history and concepts of Thai temple mural painting. According to the research results, the history of Thai mural painting dates back to the late 14th century when Wat Chedi Chet Taeo in Si Satchanalai was built. The Sinhalese elements embedded in the Sukhothai murals are also found in the Ayuthayan stupa murals made in the early 15th century. The mid 18th century's Burmese invasion into Ayuthaya destroyed most of Buddhist temples in the Kingdom of Ayuthaya and as a result, Buddhist murals of the late Ayuthayan age are hardly found except for some temple murals located outside of the capital. The late Ayuthayan murals are much different from the early Ayuthayan murals in that they are narrative in depicting Jataka and the life of Lord Buddha. This classical mural painting culminated in the age of Rama III of Bangkok Dynasty. His successor Rama IV undertook westernized reforms which influenced the area of traditional mural painting. Consequently, new western style Buddhist mural paintings were produced while themes of mural painting were enlarged to the other subjects such as historical recording of royal and social events. This trend continued in the age of Rama V but the development of Thai Buddhist mural painting discontinued after the death of Rama V due to the rapid westernization and decrease of illiteracy. The existing Buddhist murals produced on or before the reign of Rama V are deteriorating and disappearing. The reasons for this are partly because of Thailand's humid climate. However, some social backgrounds such as the lack of concern for preserving old Buddhist murals can not be disregarded. Considering the substantial value of Thai Buddhist murals as a cultural resource in Thai society, it is very urgent to establish appropriate conservation policy for them.

• International Journal of Advanced Culture Technology
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• v.3 no.1
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• pp.145-152
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• 2015

The article aims to apply a friction stir spot welding for producing the lap joint between AA5052 aluminum alloy and C11000 copper alloy. The dimension of the materials was 100 mm in length, 30 mm in width and 1.0 mm in thickness. The copper plate was set overlap the aluminum plate by 30 mm. The welding parameter was the rotating speed of 2500-4000 rpm, the pin inserting rate of 2-8 mm/min and the holding time of 6 sec. The mechanical properties test and the microstructure investigation were performed to evaluate the lap joint quality. The summarized results are as follows. The friction stir spot welding could produce effectively the lap joint between AA5052 and C11000 copper. Increase of the rotating speed and holding time directly affected to decrease the tensile shear strength of the lap joint. The optimized welding parameters in this study that indicated the tensile shear strength of 864 N was the rotating speed of 3500 rpm, the pin inserting rate of 6 mm/min and the holding time of 4sec. The experimental results also showed that the hardness of the weld metal was lower than that of the base materials.

• Journal of Radiation Protection and Research
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• v.40 no.3
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• pp.147-154
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• 2015

The scatter photons and photoneutrons from high energy photon beams (more than 10 MV) will increase the undesired dose to the patient and the staff working in linear accelerator room. This undesired dose which is found at out-of-field area can increase the probability of secondary malignancy. The purpose of this study is to determine the equivalent dose of scatter photons and neutrons generated by 3 different treatment techniques: 3D-conformal, intensity modulated radiation therapy (IMRT) and volumetric modulated arc therapy (VMAT). The measurement was performed using two types of the optically stimulation luminescence detectors (OSL and OSLN) in the Alderson Rando phantom that was irradiated by 3 different treatment techniques following the actual prostate cancer treatment plans. The scatter photon and neutron equivalent dose were compared among the 3 treatments techniques at the surface in the out-of-field area and the critical organs. Maximum equivalent dose of scatter photons and neutrons was found when using the IMRT technique. The scatter neutrons showed average equivalent doses of 0.26, 0.63 and $0.31mSv{\cdot}Gy^{-1}$ at abdominal surface region which was 20 cm from isocenter for 3D, IMRT and VMAT, respectively. The scattered photons equivalent doses were 6.94, 10.17 and $6.56mSv{\cdot}Gy^{-1}$ for 3D, IMRT and VMAT, respectively. For the 5 organ dose measurements, the scattered neutron and photon equivalent doses in out of field from the IMRT plan were highest. The result revealed that the scatter equivalent doses for neutron and photon were higher for IMRT. So the suitable treatment techniques should be selected to benefit the patient and the treatment room staff.