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Mueang Nonthaburi, Thailand

The Electricity Generating Authority of Thailand , Thai: การไฟฟ้าฝ่ายผลิตแห่งประเทศไทย, is a state enterprise that owns and manages the majority of Thailand's electricity generation capacity, as well as the nation's transmission network.EGAT is managed by the Ministry of Energy.Most of EGAT's electricity is sold to the Metropolitan Electricity Authority and the Provincial Electricity Authority . Wikipedia.

Ngarmukos C.,Ramathibodi Hospital | Chailurkit L.-O.,Ramathibodi Hospital | Chanprasertyothin S.,Mahidol University | Hengprasith B.,Electricity Generating Authority of Thailand | And 2 more authors.
Clinical Endocrinology

Background: Osteocalcin (OC), an osteoblast-specific protein, has been demonstrated to affect glucose metabolism in both animals and humans. Studies in animals have shown an effect of undercarboxylated OC (ucOC) on beta-cell proliferation and insulin resistance. It remains unclear whether OC is associated with the future development of diabetes in humans, as well as the relative importance of ucOC vs OC. Objective: The aim of this study was to examine serum OC and its post-translational forms as potential biomarkers for future the development of type 2 diabetes. Methods: This was a nested case-control study using data from the Electricity Generating Authority of Thailand (EGAT). We identified 63 men without diabetes in the exploratory cohort at baseline who developed type 2 diabetes (DM) during the 10-year follow-up period from 1998-2008, and also 63 men age- and BMI-matched for a non-diabetes control group (non-DM). Serum N-mid OC and ucOC were measured in baseline blood samples. Logistic regression models were used to explore and identify baseline factors, including OC and ucOC, that predicted the subsequent development of diabetes. Results: The mean age and BMI were similar in both non-DM and DM groups (47.2 ± 0.5 vs 47.8 ± 0.8 years and 25.2 ± 0.5 vs 25.9 ± 0.5 kg/m 2, respectively). Only baseline mean serum N-mid OC (15.2 ± 0.5 vs 13.0 ± 0.5 μg/l, P < 0.05) and fasting plasma glucose (4.92 ± 0.04 vs 5.28 ± 0.07 mmol/l, P < 0.05) were significantly different between the two groups. Multiple logistic regression analysis showed that baseline serum N-mid OC and glucose, but not ucOC, were independent risk factors for the development of diabetes in this long-term study cohort. Conclusions: Circulating total OC is associated with incident diabetes in men. Further studies to evaluate the potential utility of OC as a biomarker to predict the development of type 2 diabetes are warranted. © 2012 Blackwell Publishing Ltd. Source

Chureesampant K.,Electricity Generating Authority of Thailand
35th Asian Conference on Remote Sensing 2014, ACRS 2014: Sensing for Reintegration of Societies

This paper addresses the change detection capabilities of polarimetric synthetic aperture radar (SAR) for the L-band frequency in comparison with single- and dual-polarization and fully polarimetric SAR data. The combinations of polarized power data are combined co-polarized power (HH+VV) data, combined cross-polarized power (HV+VH) data, and total power (HH+HV+VH+VV) data. All polarization combinations are investigated quantitatively for unsupervised change detection under different topographic characteristics. In particular, highly urbanized area (Osaka), vegetated area (Chiba), and mixed topographic area (Kyoto) in Japan are examined. The unsupervised change detection method applied in this study is based on a closed-loop process. Firstly, adaptive iterative filtering is used to determine the optimal filter size such that the speckle noise is sufficiently reduced. Secondly, the log-ratio image is generated from filtered SAR images and is modeled according to a Gaussian distribution. Thirdly, the Kittler-Illingworth minimum error thresholding (KI) algorithm is applied under generalized Gaussian (GG) assumption to select the optimal double thresholding (T1, T2) that discriminates the positive changes with backscatter increase and negative changes with backscatter decrease from the unchanged areas. The double thresholding was obtained from the two lowest KI criterion function JGG(T1,T2) values, and this showed high potential for generating accurate change detection. From a comparison of the change detection performance for various topographic features, the combined cross-polarized power (HV+VH) data are preferable if fully polarimetric data are unavailable. The selection of filter size affects the change detection accuracy, and is dependent on the topographic characteristics. Source

Nuntaphan A.,Electricity Generating Authority of Thailand | Vithayasai S.,Chiang Mai University | Vorayos N.,Chiang Mai University | Kiatsiriroat T.,Chiang Mai University
International Communications in Heat and Mass Transfer

This paper presents the performance of a wire-on-tube heat exchanger of which the wire is an oscillating heat pipe. The experiments for this heat exchanger were performed in a wind tunnel by exchanging heat between hot water flowing inside the heat exchanger tubes and air stream flowing across the external surface. R123, methanol and acetone were selected as working fluids of the oscillating heat pipe. The inlet water temperature was varied from 45 to 85 °C while the inlet air temperature was kept constant at 25 °C. The results show that the oscillating heat pipe technique for all working fluids could increase around 10% of the heat transfer rate obtained from that without the refrigerant flow in the capillary tube when the inlet water temperature is at 60 °C. Moreover, the heat transfer models for evaluating the heat exchanger effectiveness and the air-side heat transfer coefficient, are also developed in this work. These results of the models agreed very well with the experimental data. © 2009 Elsevier Ltd. All rights reserved. Source

Chotivisarut N.,Rajamangala University of Technology at Lanna | Nuntaphan A.,Electricity Generating Authority of Thailand | Kiatsiriroat T.,Chiang Mai University
Renewable Energy

In this study, a concept of using thermosyphon heat pipe radiator to extract heat from water in a storage tank to generate cooling water during the nighttime was proposed. The cooling water could be used to serve the cooling load in a room during the daytime. A tested room with artificial load was constructed and a heat transfer model to calculate the water temperature during the nighttime and the room temperature during the daytime was developed. The simulated results agreed well with those of the experimental data. The model was used to find out the possibility of this concept for seasonal cooling load reduction of the similar building in the areas of different climates. The selected sites were Bangkok and Chiang Mai, Thailand and also Alice Springs, Australia where they are hot and humid, hot and semi-humid, and hot and semi-arid, respectively. Cooling water was produced during winter and used to serve cooling load in an air-conditioned building in summer. It found that, among three cities, Alice Spring showed a highest potential followed by Chiang Mai and Bangkok. The effect of controlled room temperature and UA of the room cooling coil on summer load fraction were shown. © 2011 Elsevier Ltd. Source

Kongnam C.,Electricity Generating Authority of Thailand | Nuchprayoon S.,Chiang Mai University
Renewable Energy

The control problem of a wind turbine involves the determination of rotor speed and tip-speed ratio to maximize power and energy capture from the wind. The problem can be formulated as a nonlinear programming problem with the annual energy generation as the objective function. The wind speed distribution is modeled as the Weibull distribution. The Weibull shape and scale parameters are assigned to be stochastic in response to limited wind data and variability nature of the wind. It is proposed to apply particle swarm optimization to solve for optimum rotor speed under fixed-speed operation and optimum tip-speed ratio under variable-speed operation. The optimum rotor speed varies with the wind speed distribution, while the optimum tip-speed ratio does not depend on the wind speed distribution. It can be concluded from the simulation results that both the wind power and energy are more dependent of the Weibull scale parameter than the Weibull shape parameter. This implies that the wind power and energy are more dependent of the mean wind speed than the speed distribution. © 2010 Elsevier Ltd. Source

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