cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2015.256
title: DESIGN OF HOME USED SEASONING POWDER PACKAGE

description: The research in the design of home used seasoning powder package focuses on the systematic approach to generate, select idea, and refine the component requirement of the package according to the customer need and company capability. The research qualitatively indicated the knowledge of the usage requirement of the seasoning powder package through focus group, in which the quick resealing, effortless resealing, and the dispensing off the side of the package is the critical finding. With the ethnographic knowledge produced from target customer voice, 6 design concepts, which hold the function that responds to the usage requirement has been generated. All concepts employ innovation of reseal mechanism, and retaining the storage function through conventional package form as sachet and bottle. Moreover, the research has conducted the selection of the concept. With the criteria in three aspects, which are the usage, marketability, and operability. Through the use of Pugh Matrix, the weight the sub criteria and its weighting has been designated according to concern and constraint from both customer and manufacturer side, which resulted in the best concept as the “Sticker side reseal pouch design”. With the close scoring on four concept namely “Sticker reseal”, “Spice lid”, “Modular sachet”, and “Zip reseal”, the Failure mode and effect analysis were conducted based on the best concept as well as ensuing the improvement of the good point from closing concept. The final result of design has been refined to the component level through the process.
DOI: 10.14457/cu.the.2015.257
title: A 2D FINITE VOLUME SIMULATION OF ELECTRICAL POTENTIAL DROP IN CRACKED PLATES

description: The electric potential drop technique is an effective crack monitoring method, especially in harsh environment conditions such as high-temperature and high-radiation, etc. In this method, the calibration curve - the relationship between potential drop across the crack and the crack sizes - is needed. This work employed a cell-centered finite volume discretization with unstructured quadrilateral mesh to model the potential distribution within cracked specimens. The numerical model is implemented via a C++ program. The program was used to calculate calibration curves of the single edge cracked and central cracked specimen with the crack length to specimen width ratios from 0.1 to 0.8 at 0.1 intervals. The numerical calibration curve conforms well with Johnson’s analytical solutions with the maximum error of 1.15% in the single edge crack cases and 1.69% in the central cracked cases. This thesis also uses the obtained model to determine the inclined edge crack shape with crack length to specimen width ratios varies from 0.1 to 0.8 and cracked angle from 7.5° to 45° at every 7.5° interval. The adjacent potential measured positions are added to establish another calibration curve of the adjacent potential ratio. With those two curves, the inclined crack shape can be identified. This method is verified by 2 case studies. The first specimen has an inclined crack with crack length to specimen width ratio of 0.55 and inclined angle of 40°. The predicted crack length error is 0.11% and cracked angle error is 0.25%. The second specimen has an inclined crack with crack length to specimen width ratio of 0.35 and inclined angle of 10°. The predicted crack length error is 0.34% and cracked angle error is 4.5%.
DOI: 10.14457/cu.the.2015.258
title: RISK ALLOCATION IN PUBLIC ROAD CONSTRUCTION CONTRACTS IN CAMBODIA

description: In recent years, the number of competitively bid contracts for road construction projects under the support of government budgets in Cambodia has been increasing and outnumbering the negotiated contracts being used. The nation strives for more efficient contracts, especially those with balanced risk allocation. This research proposes a guideline for improving the general conditions of public road construction contracts by focusing on risk allocation clauses. It begins with identifying risks in public road construction projects in Cambodia. It then compares the general conditions of the government contract with those of the FIDIC contract, especially their risk allocation clauses. This comparison results in many possible contract modifications, which are then verified with Cambodian related laws and regulations, as well as by experienced contract practitioners and university lecturers. It is found that there are 25 risks associated with public road construction projects in Cambodia. The comparison of the FIDIC and government construction contracts shows that the risk allocation clauses of the Cambodian construction contracts are unclear and inadequate to address several risks. This research suggests three possible alternatives for contract modifications, namely, delete unnecessary risk clauses, add new risk clauses, and modify existing risk clauses. The proposed contract modifications are in accordance with related laws and regulations. Yet, there are some issues that cannot include in the contract, namely, cost compensation, corruption, and contractor's financial guarantee. Moreover, the duration of some activities proposed in the modified contract is different from that in the FIDIC contract.
DOI: 10.14457/cu.the.2015.259
title: Viscosity measurement and correlation for oil and its emulsion from Fang oilfield.

description: In petroleum industry, emulsion, a mixture of oil and produced water can be formed from oil recovery. It is found in many processes such as production, pipeline transportation and separation. This emulsion can result in several problems in handling facilities and separation. Viscosity and stability of emulsion are the key parameters to transport and separate oil and water to meet sales specification. Therefore, the objectives of this work are to measure the viscosity of emulsion and to evaluate the stability of emulsion of light oil from Fang oilfield in Thailand. The parameters of this study are temperature, shear rate and water cut ranging from 50 to 80 °C, 3.75 to 60 s-1and 0 to 60%, respectively. Also, the droplets of oil and water are investigated to evaluate the stablity of emulsion. These effects of parameters on viscosity and stability of emulsion are required to design the process and to increase oil production. The results shows that viscosity decreases as temperature and shear rate increase and water cut becomes lower. Droplet sizes at different shear rates are also investigated. Droplet sizes become smaller when high shear rate applies and emulsion becomes more stable. Furthermore, correlations are developed to predict the visocisty and stability of the oil and emulsion from Thailand.
DOI: 10.14457/cu.the.2015.260
title: Effects of recharging strategy for zinc-air battery

description: This research presents recharging strategies for zinc-air battery to study its recharging performance including recharging time, efficiency and cycling stability resulted from oxygen evolution reaction and water electrolysis reaction which is side reaction. The effects of recharging current density on these reactions are studied. In addition, various recharging strategies are also investigated to improve recharging performances of the battery. The results are obtained through simulation in Matlab. It was found that recharging with high current density resulted in incomplete of recharging process due to oxygen bubbles growth from high rate of oxygen evolution. This problem can be overcome by two-stage and multi-stage recharging strategies which yield 100% state of charge (SOC) of the battery with high efficiency in short time. Furthermore, the cycling stability of the battery is improved by these strategies. As for the effects of side reaction, it affects insignificantly small scale battery.
DOI: 10.14457/cu.the.2015.261
title: DEHYDRATION REACTION OF ETHANOL OVER BETA ZEOLITE CATALYST

description: Three different Al-based solid acid catalysts including H-beta zeolite (HBZ), modified H-beta zeolite with γ-Al2O3 (Al-HBZ) and mixed γ- χ phase of Al2O3 (M-Al) catalysts were investigated for catalytic properties and performance via ethanol dehydration. In addition, DEE production via ethanol dehydration and improvement of catalytic activity were also studied over Ru and Pt modification of H-beta zeolite catalysts demoted as Ru- and Pt- modified H-beta zeolite (Ru-HBZ and Pt-HBZ) catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 physisorption, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), NH3-tempearture programmed desorption (NH3-TPD) and thermal gravimetric analysis (TGA). The catalytic activity was tested for ethylene production by dehydration reaction of ethanol in gas phase at atmospheric pressure and temperature between 200 to 400°C. Meanwhile, the time-on-stream of the catalyst for 10 and 72 h during the reaction at suitable temperature was determined for catalytic performance. It was found that the HBZ catalyst exhibited the highest products yield and catalytic activity because it has the highest surface area and amount of weak acid site for catalyzing this reaction. In addition, the modification of HBZ with Ru- and Pt- as promoters could enhance the surface area for opportunity in increasing catalytic activity, which is suitable for ethanol dehydration to DEE. The addition of Ru over HBZ is advantage to increase the DEE yield at 250°C for this condition. The maximum yield of DEE (35%) was obtained from Ru-HBZ at 250°C.
DOI: 10.14457/cu.the.2015.262
title: Optimization of Pillar Design for Potash Deposits of Khorat Basin, Northeast Thailand

description: Khorat Basin is the biggest evaporite basin of Thailand where there is a huge potash deposit underneath this basin. Potash in Khorat Basin is located in Maha Sarakham formation overlying the lower rock salt which have the depth of more than hundred meters. Underground mining method called ‘Room and Pillar’ is one of the most suitable methods to extract potash. However, there is no intensive study on pillar design for potash of Thailand yet. This work offers a procedure to determine the optimal dimension of pillar for underground potash mine in Thailand, especially under Khorat, which in turn provides the best balance between extraction ratio and stability. The design is focused on both regular pillar and barrier pillar. The study has been carried out using both empirical and numerical analysis. Obert and Duvall relation equation, for estimation the pillar strength in an underground coal mine, is adapted in empirical case studies which is then calibrated with numerical modeling by using FLAC3D. Mechanical properties of potash from Khorat Basin are chosen as the input parameters of the study. The result of optimal dimension of pillar is represented by safety envelop which is constructed utilizing simulated result from numerical analysis. The safety envelops illustrate the decrease of 10% in extraction ratio when the depth is increased from 200m to 300m. As expected, the empirical equation is not suitable for estimating strength of potash in Thailand yet. The study of slenderness constants is the key for modifying the equation above to be applicable for potash in Thailand. The result finally shows the capability of modified formulas for effectively estimated pillar strength.
DOI: 10.14457/cu.the.2015.263
title: PERFORMANCE ASSESSMENT OF A BIOGAS SORPTION ENHANCED CHEMICAL LOOPING REFORMING PROCESS INTEGRATED WITH HIGH TEMPERATURE PEM FUEL CELL SYSTEM

description: In this research, a biogas sorption enhanced chemical looping reforming (SECLR) process integrated with high temperature proton exchange membrane fuel cell (HT-PEMFC)is analyzed. The thermodynamic concept and electrochemical model are used to identify the suitable operating conditions of the proposed process. Exergy and energy analyses are used to describe the effect of various parameters, such as reforming temperature, steam-to-biogas molar ratio, CaO-to-biogas molar ratio and NiO-to-biogas molar ratio, on the process performance. The exergy destruction of each unit is employed to identify the quality of energy that is used in each unit. The data obtained can be used to improve the energy and exergy efficiencies of the process. The simulation results show that the exergy efficiency of the process is improved from 16.60% to 26.72% when a process heat integration is applied.
DOI: 10.14457/cu.the.2015.264
title: PRE-FEASIBILITY STUDY OF TIN MINE: A CASE STUDY OF TIN MINE IN THAILAND

description: This research conducted a pre-feasibility study of a cassiterite mining project location at Bankha district, Rachaburi Province, Thailand. The main purposes of this project were (1) resource/reserve estimation, mine design and planning and mine development (2) comparison of ore transportation systems between truck-loader and belt conveyor system and (3) the project financial analysis by using cash model. The resource/reserve estimation and mine design and planning were carried out by using the software “Mincom Minescape 5.7”. The open-pit mining method was chosen and the mineable reserve was estimated at 2,795,468 metric tons. The mining capacity is 700,000 metric tons per year, and the mine life is estimated at 4 years. This resulted in the tin metal production of 2,510 metric tons for the project. The belt conveyor system was used for the main ore transportation system. The result of the project financial analysis showned that the Net Present Value (NPV) was 447,779,678 Baht, the Internal Rate of Return (IRR) was 79% and the Payback Period (PP) was 1 year and 1 month.
DOI: 10.14457/cu.the.2015.265
title: CONTROL PERFORMANCE ASSESSMENT OF WIND TURBINE BY STOCHASTIC METHOD

description: This research presents control performance assessment (CPA) techniques by stochastic method to evaluate performance and robustness of PI pitch control system in wind turbine system. Two scenarios affecting performance and robustness of the system, including a fault of pitch actuator and fluctuation of wind speed, are investigated. Simulation data of both scenarios using FAST 7 simulator in MATLAB are analyzed to obtain performance index in terms of minimum variance index and to obtain a robustness index by frequency response analysis. Both performance and robustness are evaluated as on-line measurement. The results showed that CPA techniques by stochastic method adopted in PI pitch control system can effectively indicate variation of performance and robustness in both scenarios.
DOI: 10.14457/cu.the.2015.266
title: Effects of Formation Brine Compositions on Low Salinity Waterflooding Using Seawater

description: Water injection is a process to maintain reservoir pressure and at the same time to sweep remaining hydrocarbon in reservoir when forces provided by primary recovery is not adequate. Recent studies concluded that injecting Low Salinity Brine (LSB) could yield additional oil recovery. In this study, effects of ion compositions in formation brine on low salinity seawater injection are emphasized. The composition of formation brine with total salinity of 100,000 ppm is modified in various formulations. First, physical properties of sandstone core samples are measured prior to core saturation process with different formation brines. After that, core samples are altered to oil-wet condition by flushing with organic-acid oil. Sandstone core samples are then displaced by synthetic seawater. The results show that rate of oil recovery is improved when the ratio of Calcium ion to Magnesium ion is increased. Due to the larger ionic size of Calcium ion compared to Magnesium ion, the ionic strength between oil and Calcium ion is weaker than of with Magnesium ion. However, if Calcium ion is excessive in formation brine, the abundance of Calcium ion will result in high rate of mineral dissolution and this will obstruct the substitution of monovalent ions from injected seawater to divalent ions on sandstone surface, resulting in decreasing of rate of oil recovery. Low Potassium ion concentration in formation brine causes diffusion of Potassium ion from injected seawater back to formation brine, substituting divalent ions between oil and surface and this increases rate of oil recovery. In addition, formation bine concentration is diluted to 75,000 and 50,000 ppm to study effects of total salinity in formation brine. The highest salinity contrast between formation and injected brines favors dissolution of bridging divalent ion through MIE mechanism and this yields the highest oil recovery factor. Lastly, when comparing seawater and diluted formation brine, the result shows that seawater yields more benefits in terms of higher oil recovery factor and rate of oil recovery than using diluted formation brine. This can be concluded that impoverishment in Calcium ion and enrichment in Potassium ion in seawater is recommended condition for injected fluid. Consequently, high amount of Calcium ion and low amount of Potassium ion in formation brine are considered as favorable conditions for seawater injection.
DOI: 10.14457/cu.the.2015.267
title: Effects of Reversibility of Surfactant Adsorption on Surfactant Flooding

description: The application of surfactant flooding is aimed to reduce interfacial tension (IFT) between aqueous and oil phases to achieve ultra-low condition. By this ultra-low condition, oil can be liberated and consecutively oil recovery is increased. However, surfactant adsorption in porous media as surfactant solution is in contact with reservoir rock surface results in a considerable economical ineffectiveness. This study is proposed to investigate adsorption and desorption mechanisms together with reversibility of surfactant adsorption in static and dynamic tests between Sodium Dodecyl Benzene Sulfonate (SDBS) and Berea sandstone. After that, study of operational parameters including surfactant slug size, surfactant concentration, and surfactant adsorption value is performed in STAR® commercial simulator. Furthermore, degrees of reversibility of surfactant adsorption on operational parameters are evaluated to investigate the effectiveness of this behavior on surfactant flooding. Laboratory experiment results of static tests revealed that adsorption of SDBS onto Berea sandstone obeys Langmuir adsorption isotherm, and the maximum adsorption and desorption values are 90 mg/100g and 27 mg/100g respectively at surfactant concentration of 1.0 %wt. However, different adsorption-desorption values are observed in dynamic tests on 1.0 %wt. concentration, which are 57.65 mg/100g and 47.86 mg/100g respectively. Study of the effects of reversibility of surfactant adsorption on interested operational parameters revealed that the best additional oil recovery is obtained from bigger injection slug with concentrations other than the maximum adsorption concentration. In case of fixed injection mass, larger slug size with less concentration for small surfactant amount, and smaller slug with higher concentration for large surfactant amount are preferred. Implementation of surfactant flooding with consideration on effects of reversibility should be performed at concentrations other than the maximum surfactant adsorption concentration with bigger slug size. Moreover, small slug size is suitable for high adsorption reservoir, while larger slug is preferred in case of low adsorption rock surface.
DOI: 10.14457/cu.the.2015.268
title: Strategies for heavy oil production with thermal recovery in heterogeneous reservoir

description: Heavy-oil is one of the main energy sources in the future. However, with the high viscosity of heavy oil, steam-flooding is one of the major techniques to produce this oil. To determine a favorable operating condition, many recent studies have evaluated different methods. However, there is no single optimum value for all reservoirs or all modes of operation. In this study, it’s aimed to investigate the strategies of selecting well spacing, injection rate, and different development periods in various areas, based on the real field data. The practical field data has been applied to simulate the inverted 5-spot steam-flooding process by using STARS, a CMG program. The project life is simulated in 20 years of production. Judging criteria of parameters are dependent on the weighted factors (1.37: 1) of maximum recovery factor/area/well and minimum cumulative steam-oil ratio/area/well. The simulation results show that the injector - producer distance at 282.8 m with 120 m3/d injection rate yields the most favorable conditions for the selection of well spacing and injection rates. Therefore, the field is evaluated by operating different areas in 10 years time basis. It's indicated that the injector - producer distance at 141.4 m with 120 m3/d injection rate is preferred for the first 10 years' operation in zone 1 area only. In terms of 20 years, the injector - producer distance at 141.4 m with 30 m3/d injection rate is more favorable.
DOI: 10.14457/cu.the.2015.269
title: Downhole water drain from bottom water-drive gas reservoir into partially depleted gas reservoir

description: One of the most important problems in producing gas from a water-drive gas reservoir is liquid loading. For a multi-layered system consisting of a bottom water-drive gas reservoir and a dry-gas reservoir located at a deeper location underneath, a method called “Downhole Water Drain from Bottom Water-Drive Gas Reservoir into Partially Depleted Gas Reservoir” (DWD) can help reduce water coning effect and thus increase gas recovery of the upper reservoir. At the same time, the water can be dumped into a partially-depleted gas reservoir to help increase gas recovery of the lower reservoir. The objective of this study is to determine appropriate conditions for applying DWD method in comparison with other production scenarios. ECLIPSE100 reservoir simulator was used to evaluate the performance of three production scenarios: commingled production, bottom-up production and DWD. Typical rock and fluid properties from Gulf of Thailand gas fields were used to create the reservoir model. The result from simulation showed that DWD performs better than conventional commingled method and bottom-up production methods in terms of increasing gas recovery and reducing water production. Tested with proper operating conditions among various reservoir conditions, DWD can help enhance gas recovery upto 16% from commingled and 13% from bottom-up production meanwhile DWD can help reduce water production by upto 155 MSTB from commingled and 110 MSTB from bottom-up production
DOI: 10.14457/cu.the.2015.270
title: RISK-RESPONSIVE STRATEGIES BY LOCAL CONTRACTORS FOR INTERNATIONAL INDUSTRIAL CONSTRUCTION PROJECTS IN VIETNAM

description: Inefficient construction risk management mainly contributes to project delay and cost overrun for Vietnamese construction firms in international construction environments. The main task of Vietnamese contractors is to respond to critical risks appropriately to achieve project goals. This research investigates risk-responsive strategies by Vietnamese contractors of international industrial construction projects (IICPs) in Vietnam. The risks in IICPs are compiled and verified by a group of IICP experts from contractors and consultants through in-depth interviews and questionnaire surveys. The allocation of such risks is identified through analyzing actual IICP contracts. The research examines the risk-responsive strategies for each risk factor by different contractors. A two-round Delphi process is adopted to conclude the contractors' risk-responsive strategies. The results shows that there are 29 risk factors for IICPs. Among them, 25 risk factors are responsible by the contractor, and the other 4 risk factors are borne by the owner. The research also identifies nine major criteria that the contractors consider when choosing appropriate risk-responsive strategies. These results can be used to create risk management systems for ICCPs. Furthermore, based on the proposed criteria contractors can adopt appropriate risk-responsive strategies to achieve project goals.