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Simulation of Seasonal Circulations and Thermohaline Variabilities in the Gulf of Thailand

Advances in Atmospheric Sciences 2008年第3期25卷 489-506页

作者： Nitima ASCHARIYAPHOTHA Prungchan wongwises somchai wongwises Usa Wannasingha HUMPHRIES 游小宝 The Joint Graduate School of Energy and Environment King Mongkut's University of Technology Thonburi The Joint Graduate School of Energy and Environment King Mongkut's University of Technology ThonburiBangkok 10140Thailand Department of Mechanical Engineering King Mongkut's University of Technology ThonburkBangkok 10140Thailand Department of Mathematics King Mongkut's University of Technology ThonburiBangkok 10140Thailand Institute of Atmospheric Physics Chinese Academy of SciencesBeijing 100029

Based on the Princeton Ocean Model （POM）, the seasonal thermohaline feature and the ocean circulation in the Gulf of Thailand （GOT）, situated between 6°N to 14°N latitude and 99°E to 105°E longitude, were studied numerically with 37 × 97 orthogonal curvilinear grid and 10 vertical sigma levels conforming to a realistic bottom topography. A spin-up phase of the first model run was executed using wind stress calculated from climatological monthly mean wind, restoring-type surface heat and salt, and climatological monthly mean fresh water flux data. In this paper, the temperature and salinity fields taken from Levitus94 data sets and the calculated temperature and salinity from the model run for 12-month mean and for each season are presented where the winter, summer, rainy, and end of the rainy seasons of Thailand are represented by the months January, April, July, and October, respectively. The simulated circulations are also described. The results show that the temperature in the GoT is warmer than the temperature of the other parts connected to the South China Sea （SCS）. At any depth of inflow from SCS into the GoT, the salinity is high, but in the outflow from the GoT at the surface, the salinity is low. The strong circulations are clockwise during summer and the rainy seasons of Thailand, which are the East Asian monsoon periods, northeasterly and southwesterly during summer. They occur near Pattani and Narathiwat provinces during summer and in the central GoT during the rainy seasons. Sensitivity experiments were designed to investigate the effects of wind forcing and open boundary conditions. Wind forcing is shown to be the important factor for generating the circulation in the GoT. The lateral velocity at the open boundaries is of considerable importance to current circulation for the rainy and end of the rainy seasons, with insignificant effect for the winter and summer seasons of Thailand.

关键词： seasonal circulation Gulf of Thailand spin-up phase thermohaline curvilinear grid

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Convective heat transfer of nanofluids with correlations

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Particuology 2011年第6期9卷 626-631页

作者： Lazarus Godson Asirvatham Balakrishnan Raja Dhasan Mohan Lal somchai wongwises R&AC Division Department of Mechanical Engineering College of Engineering Guindy Anna University Indian Institute of Information Technology Design and Manufacturing (IIITD&M)-Kancheepuram Fluid Mechanics Thermal Engineering and Multiphase Flow Research Lab (FUTURE) Department of Mechanical Engineering King Mongkut's University of Technology Thonburi The Academy of Science The Royal Institute of Thailand

To investigate the convective heat transfer of nanofluids, experiments were performed using silver-water nanofluids under laminar, transition and turbulent flow regimes in a horizontal 4.3 mm inner-diameter tube-in-tube counter-current heat transfer test section. The volume concentration of the nanoparticles varied from 0.3% to 0.9% in steps of 0.3%, and the effects of thermo-physical properties, inlet temperature, volume concentration, and mass flow rate on heat transfer coefficient were investigated. Experiments showed that the suspended nanoparticles remarkably increased the convective heat transfer coefficient, by as much as 28.7% and 69.3% for 0.3% and 0.9% of silver content, respectively. Based on the experimental results a correlation was developed to predict the Nusselt number of the silver-water nanofluid, with ＋10% agreement between experiments and prediction.

关键词： Convective heat transfer Silver Nanofluid Correlation Laminar Turbulent Transition

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Experimental Study of Jet Nanofluids Impingement System for Cooling Computer Processing Unit

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Journal of Electronics Cooling and Thermal Control 2011年第3期1卷 38-44页

作者： Paisarn Naphon somchai wongwises 不详

An experimental investigation of the jet nanofluids impingement heat transfer characteristics of mini-channel heat sink for cooling computer processing unit of personal computer is performed. The experiments are tested under the real personal computer operating conditions: no load and full load conditions. The experiments are performed for the following ranges of the parameters: coolant flow rate varies from 0.008 to 0.020 kg/s, the nozzle diameter is set to 1.00, 1.40, 1.80 mm, the distance nozzle-to-fins tip is 2.00 mm, the channel width of the mini-channel heat sink is 1.00 mm. The nanofluids with suspending of TiO2 particles in base fluid are used as a working fluids. It was observed that the average CPU temperatures obtained from the jet nanofluids impingement cooling system are 3.0%, 6.25% lower than those from the jet liquid impingement and from the conventional liquid cooling systems, respectively. However, this cooling system requires higher energy consumption.

关键词： Jet Impingement Nanofluids Cooling Cooling CPU Mini-Rectangular Fin Heat Sink

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FLOW PATTERNS AND DAMAGE OF DIKE OVERTOPPING

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International Journal of Sediment Research 2003年第4期18卷 301-309页

作者： Chaiyuth CHINNARASRI,Tawatchai TINGSANCHALI,Sutat WEESAKUL,somchai wongwises Assistant Professor Water Resources Engineering Research Lab. (WAREE) Department of Civil Engineering King Mongkut's University of Technology Thonburi 91 Pracha-utit Rd. Bangkok 10140 Professor Water Engineering and Management Program Asian Institute of Technology P.O. Box 4 Klong Luang Pathumthani 12120 Assistant Professor Water Engineering and Management Program Asian Institute of Technology P.O. Box 4 Klong Luang Pathumthani 12120 Professor Department of Mechanical Engineering King Mongkut's University of Technology Thonburi 91 Pracha-utit Rd. Bangmod Bangkok 10140

Damage of a dike may result in severe damage and suffering. To reduce downstream damage and loss of life, it is important to study the process of breaching of the damaged dike. It is not possible to understand the damage process without a clear understanding of the flow patterns encountered. In the present study, data obtained from nine experimental runs are analyzed. The flow patterns and progressive damage of dike overtopping are investigated. Two types of phenomena at the dike surface: erosion; and erosion and sliding, are observed during the overtopping event. Four stages of dike damage can be distinguished. The degradation rate of the dike crest is found to be dependent on the downstream slope of the dike. The degradation rate is higher when the downstream slope is steeper.

关键词： Flow pattern Damage Dike Overtopping

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Pancreatic tuberculosis with acquired immunodeficiency syndrome:A case report and systematic review

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World Journal of Gastroenterology 2012年第7期18卷 720-726页

作者： somchai Meesiri Department of Surgery Mae Sot General HospitalMae SotTak 63110Thailand

Pancreatic tuberculosis (TB) is a relatively rare disease that can mimic carcinoma,lymphoma,cystic neoplasia,retroperitoneal tumors,pancreatitis or ***,I report the case of a 31-year-old immigrant Burmese woman who exhibited epigastralgia,fever,weight loss and an epigastric *** patient was diagnosed with pancreatic TB and acquired immunodeficiency syndrome,and was treated with antituberculous drugs and percutaneous catheter drainage without a *** clinical presentation,radiographic investigation and management of pancreatic TB are summarized in this paper to emphasize the importance of considering this rare disease in the differential diagnosis of pancreatic masses concomitant with human immunodeficiency virus infection.I also emphasize the need for both histopathological and microbiological diagnosis via fineneedle aspiration.

关键词： Pancreas Tuberculosis Abscess Antitu-berculous drugs Human immunodeficiency virus Fine-needle aspiration

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Synthesis and characterization of Gd-doped PbMoO_(4) nanoparticles used for UV-light-driven photocatalysis

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Journal of Rare Earths 2021年第9期39卷 1056-1061页

作者： Anukorn Phuruangrat somchai Thongtem Titipun Thongtem Department of Materials Science and Technology Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla90112Thailand Department of Physics and Materials Science Faculty of ScienceChiang Mai UniversityChiang Mai.50200Thailand Materials Science Research Center Faculty of ScienceChiang Mai UniversityChiang Mai50200Thailand Department of Chemistry Faculty of ScienceChiang Mai UniversityChiang Mai.50200Thailand

Gd-doped PbMoO_(4) nanoparticles were prepared by a refluxing method at 80℃ for 2 *** of molar content of Gd dopant on phase,morphology and optical properties was *** as-prepared Gddoped PbMoO_(4) samples can be indexed to pure tetragonal PbMoO_(4) *** particles size of PbMoO_(4) is decreased with increasing in the molar content of Gd dopant from 15.20±3.04 nm for pure PbMoO_(4) to 8.72±1.53 nm for 5 mol% Gd-doped PbMoO_(4).The absorption of 5 mol% Gd-doped PbMoO_(4) nanoparticles shows red-shift caused by lattice distortion of PbMoO_(4).The photocatalytic performance of 5 mol% Gddoped PbMoO_(4) nanoparticles shows the highest degradation of rhodamine B(RhB) of 97.92% under UV radiation and 67.65% under visible radiation because Gd^(3+) dopant as an electron acceptor plays the role in enhancing the separation of electron-hole pair.

关键词： Gd-doped PbMoO_(4)nanoparticles Photocatalysis UV and Visible light irradiation Rare earths

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Critical Top Tension for Static Equilibrium Configuration of A Steel Catenary Riser

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China Ocean Engineering 2014年第6期28卷 829-842页

作者： Chainarong ATHISAKUL Karun KLAYCHAM somchai CHUCHEEPSAKUL Department of Civil Engineering Faculty of Engineering King Mongkut’s University of Technology Thonburi

This paper aims to present the critical top tension for static equilibrium configurations of a steel catenary riser（SCR） by using the finite element method. The critical top tension is the minimum top tension that can maintain the equilibrium of the SCR. If the top tension is smaller than the critical value, the equilibrium of the SCR does not exist. If the top tension is larger than the critical value, there are two possible equilibrium configurations. These two configurations exhibit the nonlinear large displacement. The configuration with the smaller displacement is stable, while the one with larger displacement is unstable. The numerical results show that the increases in the riser＇s vertical distances, horizontal offsets, riser＇s weights, internal flow velocities, and current velocities increase the critical top tensions of the SCR. In addition, the parametric studies are also performed in order to investigate the limit states for the analysis and design of the SCR.

关键词： critical top tension finite element method large displacement steel catenary riser static equilibrium

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Silica gel-assisted solvothermal production of CdS,Cu_xS (x=1,2) and ZnS with different morphologies

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中国有色金属学会会刊：英文版 2009年第B9期19卷 105-109页

作者： Titipun THONGTEM Chalermchai PILAPONG somchai THONGTEM Department of Chemistry and Center for Innovation in Chemistry Faculty of ScienceChiang Mai University Department of Physics and Materials Science Faculty of ScienceChiang Mai University

CdS, CuxS (x=1, 2) and ZnS with different morphologies were produced by the solvothermal reactions of M(CH3COO)2·2H2O (M=Cd, Cu and Zn) and NH2CSNH2 in hexane with and without silica gel as a hard template at 200 ℃ for 24 h. The product phases were detected using X-ray diffraction (XRD). Different morphologies were characterized using a scanning electron microscope (SEM). The existence of silica gel in modeling morphologies of the sulfides was characterized using Fourier transform infrared (FTIR) spectrometer. Raman spectra of different products show the vibrations at the same wavenumbers, although they are composed of different morphologies. Photoluminescence (PL) emissions of the corresponding phases with different morphologies are at the same values, but their intensities are increased by template adding.

关键词：硫化锌溶剂热形貌硅胶 CdS 傅里叶变换红外光谱硫化物形态扫描电子显微镜

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Characterization of MnWO_4 with flower-like clusters produced using spray pyrolysis

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中国有色金属学会会刊：英文版 2009年第B9期19卷 100-104页

作者： somchai THONGTEM Surangkana WANNAPOP Titipun THONGTEM Department of Physics and Materials Science Faculty of ScienceChiang Mai University Department of Chemistry and Center for Innovation in Chemistry Faculty of ScienceChiang Mai University

MnWO4 (huebnerite) with flower-like clusters of nano-plates was produced from the solutions containing MnCl2·4H2O and Na2WO4·2H2O by the 300 ℃ spray pyrolysis. The phase was detected by X-ray diffraction (XRD) and selected area electron diffraction (SAED), and is in accordance with the results characterized using energy dispersive X-ray (EDX) analysis. The flower-like clusters of nano-plates were characterized using scanning and transmission electron microscopes (SEM and TEM), and their parallel lattice planes using a high resolution transmission electron microscope (HRTEM). Vibration spectra of the huebnerite structured products were characterized using Raman and Fourier transform infrared (FTIR) spectrometers. Their photoluminescence (PL) emissions are in the same spectral region at 405-412 nm.

关键词：喷雾热分解高分辨透射电子显微镜表征产品集群傅立叶变换红外光谱 X射线衍射选区电子衍射

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Sonochemical synthesis and characterization of uniform lanthanide orthophosphate(LnPO_4, Ln=La and Ce) nanorods

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Rare Metals 2015年第5期34卷 301-307页

作者： Anukorn Phuruangrat Titipun Thongtem somchai Thongtem Department of Materials Science and Technology Faculty of Science Prince of Songkla University Department of Chemistry Faculty of Science Chiang Mai University Department of Physics and Materials Science Faculty of Science Chiang Mai University

Uniform lanthanide orthophosphate （LnPO4, Ln = La and Ce） nanorods were successfully synthesized by a simple ultrasonic irradiation method using lanthanide nitrate salt （Ln（NO3）3-6H2O, Ln = La and Ce） and sodium phosphate （Na3PO4） in aqueous solutions with the pH of 1-3. The products were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, high-resolution transmission electron microscopy （HRTEM）, Fourier transform infrared spectrometer （FT-IR）, and UV-visible （UV-Vis） spectroscopy. In this research, the products are nanorods of monoclinic LaPO4 and hexagonal CePOa structures and the vibration modes of PO4^3-, including the strong peaks at 227 nm for LaPO4, and at 225 and 278 nm for CePO4.

关键词： Ultrasonic Lanthanide orthophosphate Nanorods irradiation

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