Youplao P.,Rajamangala University of Technology at Tawan-ok
Journal of Physics: Conference Series | Year: 2017
This paper presents the design and analysis of an optical channel drop filters configuration based on a serially coupled triple ring resonator system. The filtering characteristics of such the proposed ring configuration have been investigated by using the mathematical model simulation. In this work, the optical signal as a Gaussian pulse with a specified wavelength ranges from 1545 nm to 1555 nm is used to be the input signal that launches into and propagates through the ring resonators. Whereupon, the required optical channels are obtained at the drop port. The center wavelength of these filtering optical channels can be specified and controlled by selectively applying the suitable parameters to the system, such as each the ring radius and the coupling coefficients. From the simulation results, an ultra-narrow band optical channel with a spectral width at FWHM of approximately 12 pm can be achieved. Furthermore, an attempt to tune the filtering responses of the proposed system, by customizing the refractive index of the waveguide material, has been illustrated. By din of the tuning technique, the free spectral range shift between adjacent channels of approximately 46 pm, which corresponds to be less than 6.25 GHz of a channel spacing in DWDM system, can be actualized. The potential of using such the triple ring device for filtering application is performed and discussed. © Published under licence by IOP Publishing Ltd.
Suebsuk J.,Rajamangala University of Technology at Tawan-ok |
Horpibulsuk S.,Suranaree University of Technology |
Liu M.D.,University of Wollongong
Computers and Geotechnics | Year: 2011
This paper presents a generalised critical state model with the bounding surface theory for simulating the stress-strain behaviour of overconsolidated structured clays. The model is formulated based on the framework of the Structured Cam Clay (SCC) model and is designated as the Modified Structured Cam Clay with Bounding Surface Theory (MSCC-B) model. The hardening and destructuring processes for structured clays in the overconsolidated state can be described by the proposed model. The image stress point defined by the radial mapping rule is used to determine the plastic hardening modulus, which varies along loading paths. A new proposed parameter h, which depends on the material characteristics, is introduced into the plastic hardening modulus equation to take the soil behaviour into account in the overconsolidated state. The MSCC-B model is finally evaluated in light of the model performance by comparisons with the measured data of both naturally and artificially structured clays under compression and shearing tests. From the comparisons, it is found that the MSCC-B model gives reasonable good simulations of mechanical response of structured clays in both drained and undrained conditions. With its simplicity and performance, the MSCC-B model is regarded as a practical geotechnical model for implementation in numerical analysis. © 2011 Elsevier Ltd.
Mookam N.,Rajamangala University of Technology at Tawan-ok |
Kanlayasiri K.,King Mongkut's University of Technology Thonburi
Journal of Alloys and Compounds | Year: 2011
In this paper, effect of soldering time and temperature on formation of intermetallic compounds developed between Sn-0.3Ag-0.7Cu lead-free solder and copper substrate was investigated. Dip soldering was performed at 250, 270, and 290 °C with soldering time of 5, 10, 15, and 20 s. Either ε-Cu 3Sn or η-Cu 6Sn 5 intermetallic phase was found at the interface between the solder and the substrate depending on the soldering condition, i.e., soldering time and soldering temperature. ε-Cu 3Sn was found only when the substrate was soldered at 250 °C for 5 and 10 s. At other soldering conditions, only η-Cu 6Sn 5 was found at the interfacial zone. Crystal structure of ε-Cu 3Sn intermetallic phase was orthorhombic, and it was hexagonal structure for η-Cu 6Sn 5. Transformation of the intermetallic phases was also discussed. © 2011 Elsevier B.V. All rights reserved.
Pattananurot P.,Rajamangala University of Technology at Tawan-ok
Procedia Engineering | Year: 2012
We are present the conservation and development of old buildings. Chiang Khan, Loei is the urban residential area has a history. The man migrated from Laos who settled the area along the Mekong River from 100 years ago and expanded into other areas. Chiang Khan now, A residential building of traditional style buildings interspersed with modern shops and old wooden one that is used as a shelter. Brick wood building. Single storey building constructed of concrete. In the concept of conservation vernacular buildings in Chiang Khan is tenacious of the culture. This will promote tourism in the old town. These factors will result in a successful and sustainable. We can show in these guidelines. The first is conservation of building and second to state agencies and institutions that have an understanding of the target. The principle is to inspire people in the community. And the finally, the process of conservation and development must be carried out by people in the community are involved. Near future, the man community has the capacity building and starting a community area for Chai Khong road model. The buildings have conservation and improvement of old buildings, some of Chiang Khan, which can be used to develop a continuous and sustainable. © 2010 Published by Elsevier Ltd.
Padkho N.,Rajamangala University of Technology at Tawan-ok
Procedia Engineering | Year: 2012
This research presents the wall light to develop products from agricultural waste. We are using rice straw and shell corn as raw material. Adhesives and synthetic urea Fort Thomas aldehyde 13% act as adhesives. Manufacture of light wallboard made by heat compression at temperatures 120 ° C with pressure of 150 kg/m2 for recording the 9th Na density of 400 kg/m3 and 600 kg/m3 dry. To study the thermal properties, ASTM C 177 standard test of physical and mechanical properties JIS A 5908: 2003(8type), respectively. The results show that wall light from agricultural waste. Using straw and shell corn Organized a great wall of light is determined by the materials tested showed that the fibre material derived from corn shell. Density of 600 kg/m3 feature good product. The water absorption of less value to 61.00 (1hoursoak) 104.93 (Soak 24hours) tension fire. (Internal Bond) to 0.16 MPa density (Density) 622.09 kg/m3 and moisture (Moisture Content) 10.54% 13% by volume of synthetic adhesives, dry weight. In this paper show result optimize of the properties of standard JIS A 5908-2003 and Mokfrom0.876to2547. © 2010 Published by Elsevier Ltd.
Srimuang W.,Rajamangala University of Technology at Tawan-ok |
Amatachaya P.,Rajamangala University of Technology at Tawan-ok
Renewable and Sustainable Energy Reviews | Year: 2012
The waste heat recovery by heat pipes is accepted as an excellent way of saving energy and preventing global warming. This paper is a literature review of the application of heat pipes heat exchangers for the heat recovery that is focused on the energy saving and the enhanced effectiveness of the conventional heat pipe (CHP), two-phase closed thermosyphon (TPCT) and oscillating heat pipe (OHP) heat exchangers. The relevant papers were allocated into three main categories, and the experimental studies were summarized. These research papers were analyzed to support future works. Finally, the parameters of effectiveness of the CHP, TPCT and OHP heat exchangers were described. This review article provides additional information for the design of heat pipe heat exchangers with optimum conditions in the heat recovery system. © 2012 Elsevier Ltd. All right reserved.
Kaweegitbundit P.,Rajamangala University of Technology at Tawan-ok
Advanced Materials Research | Year: 2011
This paper considers flow shop scheduling problems with sequence dependent setup time. The makespan criterion has been considered. In this paper presented a comparison of three heuristics for solves this problem. The memetic algorithm, genetic algorithm and NEH heuristic have been compared. In the experimental, the result from memetic algorithm is maximum the best solution. Therefore, the MA heuristic outperforms other heuristic. © (2011) Trans Tech Publications, Switzerland.
Hussaro K.,Rajamangala University of Technology at Tawan-ok
American Journal of Environmental Sciences | Year: 2014
Hydrogen Sulfide (H2S, rotten-egg) is one of the major environmental pollutants having its sources in natural and anthropogenic activities. It's had smell gas produced by anaerobic digestion in acid condition from organic and inorganic compounds containing sulphur, presents dual problems of its toxicity and foul ordour. One of methods of its removal is adsorption. Activated carbon is a widely used adsorbent in the treatment of air pollution. Adsorption type and capacity are primarily based on the physical properties of pores, namely the surface area. Convetionnally, activated carbon is produced from biomass residues, wood coal and agricultural residuces. Today, one promising approach for the production of cheap and efficient activated carbon is used of waste from palm oil mill industries, which is palm oil shell. Palm oil shell is available in large quantities of approximately 0.53 million tonnes annually in Thailand. Palm oil shell is a by-products of the palm oil industry and was used as a raw material in this study due to its high carbon content, high density and low ash content. Normally, H2S in biogas, which is found the range between as low as about 50-10,000 ppm depending on the feed material composition to prodction, can cause corrosion to engine and metal substance via of SO2 from combustion. H2S must be removed from biogas product prior to further utilization. Therefore, in these research the usage of palm oil shell is especially important due to its high value added for produced activated carbon adsorbent for H2S adsorption in biogas product. In this study, fixed bed reactor (stainless steel with 54.1 mm internal diameter and 320 mm length) was studied to observe the effect of char product: Chemical agent ratio (Na2CO3 and ZnCl2, 1:1 to 1:3), which there are activated at 700°C activation temperature for 2 h on the chemical and physical properties, BET surface area, the pore volume, micropore volume and hydrogen sulfide adsorption. The result showed that the BET surface area, BET surface area, the pore volume and micropore volume increased progressively with increasing the char product: Chemical agent ratio. The value of maen total pore volume of activated carbon increased with an increased char product: Chemical impregnation agent ratio (Na2CO3 and ZnCl2) as is a 1:1 to 1:3, from 0.3743 to 0.4181 cc/g and 0.2877 to 0.3137 cc/g, respectively. The average micropore volume were 0.2224, 0.2411, 0.2270, 0.1721, 0.1686 and 0.1546 cc/g of AC_Na13, AC_Na12, AC_Na11, AC_Z13, AC_Z12 and AC_Z11, respectively. The results of yield, it was found that that the activated carbon for Na2CO3 agent is higher than activated carbon for ZnCl2 agent. The highest of yield was 32.3% for AC_Na13. Moreover, the maximum BET surface area and H2S adsorption was 743.71 m2/g and 247.33 ppm was obtained on AC_Na13. This gave H2S adsorption more than commercial activated carbon (1%). Guideline for evaluation chemically activated carbon for potential application were suggestd. The conclusion showed that AC_Na13 has good chemical and physical properties scuh as chemical content and surface area, which showed that the highest H2S adsorption (247.33 ppm). The carbon content and BET surface area of AC_Na13 were 78.76 (wt%) and 743.71 m2/g, respectively. Thus, chemical agent (Na2CO3) can be used effectively as an operating strategy to optimize surface area. The synthetices activated carbon with suggested BET surface area were is good agreement with those obtained with chemical activation by Na2CO3 impregnation. Moreover, activated carbon was used to the H2S removal, it is also for environment benefit in which air pollution by H2S emission and impact on human health could be potentially reduced. © 2014 Science Publication.
Boonchuay C.,Rajamangala University of Technology at Tawan-ok
IEEE Transactions on Power Systems | Year: 2014
In a new environment of energy deregulation, the locational marginal price (LMP) basis is overwhelming congestion management issues. But it still requires proper ancillary services to serve the system. Load frequency control (LFC) is needed to maintain the system frequency in the dynamic environment. In this letter, an efficient LFC approach with the critical load level (CLL)-based adaptive participation factor is proposed for an LMP-based market. The CLL is considered when the load varies from the generation set point. The proposed approach could enhance the LFC performance in securely following up the aggressive change of energy demand. The PJM 5-bus system is used to illustrate the proposed LFC. © 1969-2012 IEEE.
Prommas R.,Rajamangala University of Technology at Tawan-ok
International Communications in Heat and Mass Transfer | Year: 2011
In this paper, the experimental validation of a combined mass and thermal model for a convective drying of multi-layered packed beds composed of glass beads, water and air is presented. The effects of the drying time, particle size and the layered structure on the overall drying kinetics are clarified in detail. Based on a completed model combining the temperature, total pressure and moisture equations, the results show that the convective drying kinetics strongly depend on the particle size as well as hydrodynamic properties and layered structure, considering the interference between capillary flow and vapor diffusion in the multi-layered porous packed bed. The predicted results are in a good agreement with the experimental results. © 2011 Elsevier Ltd.