cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2016.96
title: Financial Analysis of Cooling Conservation Method for Long-Term Paddy Storage in Thailand

description: The objective of this dissertation is to analyse costs and benefits of using cooling conservation method for long-term paddy storage in Thailand. The main problem of paddy storage is deteriorate paddy and rice during storage period. So, cooling conservation method is a ventilation method that can control temperature and moisture content of paddy during storage to reduce losses and avoid deteriorate paddy. This research collected all the benefits and costs both tangible and intangible and compared to existing method. The scope of this study is focus on 2 transformation options which are transform from circulation method to cooling conservation method and transform from industrial fan method to cooling conservation method. This research used cost benefit analysis and payback period analysis to analyse all the collected data from surveying. It also shows calculation of all tangible data. Moreover, payback period calculation sheet is also an outcome of this research for put own data and get the result. This research will be a tool that helps to make a decision to transform from the existing ventilation method to cooling conservation method which will make a lot of benefits for paddy storage and make a better quality of rice which leads to higher selling price of paddy. This will be the method that enhances the perspective of paddy and rice market for Thailand and for the world.
DOI: 10.14457/cu.the.2016.97
title: Effect of hydrogen on Ziegler - Natta catalysts prepared by different methods for ethylene polymerization

description: This study focuses on effect of hydrogen on Ziegler-Natta (ZN) catalyst system for ethylene polymerization. The study was divided into four parts. Regarding to the first part, two types of ZN catalysts, TiCl4/MgCl2/THF (ZN-THF) and TiCl4/MgCl2•6EtOH (ZN-EtOH) catalysts, were compared. The results showed that ZN-EtOH had better active center distribution than that of ZN-THF. As a result, ZN-EtOH could retard the effect of hydrogen and showed higher activity than ZN-THF. According to higher hydrogen response of ZN-THF, ZN-THF system was selected to study in the second and the third parts with Lewis acid modification in order to improve the catalytic performance. AlCl3 and FeCl2 were employed in the second part. FeCl2 showed higher efficiency to remove the remaining THF in MgCl2 structure and provided better hydrogen response than AlCl3. For the third part, ZnCl2, mixed ZnCl2 with AlCl3 and mixed ZnCl2 with FeCl2 were studied in ZN-THF system. The results showed that ZnCl2 acted as a poison to catalyst resulting to the reduction of activity. The addition of the second Lewis acid could improve the activity; however, activity was still slightly lower than undoped ZnCl2 catalyst. For the last part, effect of alkoxysilanes as external donor on 2 types of the commercial catalysts, TiCl4/MgCl2•nEtOH and TiCl4/phthalate type/MgCl2, was investigated. Cyclohexylmethyldimethoxysilane could decrease activity more than dimethoxydimethylsilane did and provide higher hydrogen sensitivity as well.
DOI: 10.14457/cu.the.2016.98
title: Development of nickel oxide electrode for application in dopamine detection

description: This research studied the synthesis of nickel oxide as a catalyst for dopamine detection to modified working electrode by electrochemical with cyclic voltammetry. In the system, the potentiostat connect electrode with silver/silver chloride reference electrode and platinum counter electrode. In this study, the synthesis of nickel oxide by precipitation method was compared between using sodium hydroxide (NaOH) and urea (CH4N2O) as a precipitating agent and with/without surfactant adding. It was found that nickel oxide from both precipitating agents showed an improvement of the current response when compared with unmodified nickel oxide electrode. The study of nickel oxide loading on the electrode showed the highest current response at 0.078 mg of nickel oxide loading. The modification of nickel oxide by addition of surfactant and hydrothermal treatment that found the highest current response obtain from nickel oxide modified electrode that synthesized from precipitation with urea by addition of mixed surfactant of butanediyl-1, 4-bis(dimethyldodecylammonium bromide)(C12-C4-C12,2Br-) 0.04 mM and Sodium dodecyl sulphate(SDS) 8.2 mM and hydrothermal at 120 ºC. Determination of dopamine by oxidation of dopamine was improved electrochemical response by nickel oxide modified electrode at 0.3 V of apply voltage. The detection of dopamine was operated in 10 mM phosphate buffer solution, pH 7.0 show two linear range that are 3.125 – 100 and 100 – 500 µM with sensitivity 0.0498 and 0.01 µA/µM, respectively. The limit of detection was 1.75 µM.
DOI: 10.14457/cu.the.2016.99
title: The ethanol dehydration over alumina-spherical silica particle composite catalyst from modified sol-gel method

description: The spherical silica particle (SSP) and alumina silica composite (Al-SSP) catalysts were investigated for catalytic properties and catalytic activity via dehydration of ethanol. The SSP and Al-SSP catalysts were prepared by modified sol gel method with various alumina content ranges from 20 to 80 mol%. The properties of these catalysts were characterized by TGA, SEM, XRD, FTIR, EDX, XRF, NH3-TPD and nitrogen physisorption. In the first part, the dehydration of ethanol in gas phase over SSP and Al-SSP catalysts was performed in a fix-bed reactor at the atmospheric pressure with various temperatures from 200 to 400 ºC. The 60Al-SSP catalyst exhibited significantly higher acidity than the others. The ethanol conversion and selectivity depend on alumina content and reaction temperature. At lower temperature, diethyl ether was produced in significant quantities, while at higher temperature, ethylene was the major product. It was found that the 60Al-SSP exhibited the highest ethanol conversion and ethylene selectivity. The next part, it was found that the increasing of water content in reactant led to the increasing of ethanol conversion and ethylene yield at high temperature. However, it remains below the ethanol conversion and ethylene yield of pure ethanol. In the last part, the performance of 60Al-SSP via time on stream (TOS) test for 10 hours was investigated. The results showed that the conversion of ethanol and ethylene yield of pure ethanol kept constant at high during 10 hours, while the conversion and the ethylene yield of bioethanol slowly increased. And the coke formation on 60Al-SSP catalyst with using pure ethanol was higher than bioethanol.
DOI: 10.14457/cu.the.2016.100
title: A system for monitoring cost and payment with 5D BIM

description: Cost and payment monitoring are claimed as the essential process for project management. Cost and payment monitoring is used for tracking the status of project cost during the construction process. However, the current information of cost and payment in the monitoring practice has to manually check with several documents including drawing, cost data and schedule plans. So the traditional practice has consumed more time with unnecessary works and caused some difficulties in the re-calculation to monitor cost and payment progress. To overcome this problem, this research proposed the system for monitoring cost and payment progress by using building information modelling (BIM), which is referred to 5D BIM. The system could be applied to interchange time and cost information with 3D model. To develop this system, current practices on cost and payment monitoring is explored by interviewing experts about related process and information. With the result of interview, the framework of the cost and payment monitoring system is developed. This system applies visual programming language (Dynamo) to link information between Revit and Excel. In preconstruction stage, the information of cost and schedule plan is defined in Excel. The system is developed by using the visual programming extension to interchange cost and time information with 3D model that interacts date from excel to 3D model. In construction stage, actual progress of cost and payment are collected and stored in Excel and 3D model, the visual programming extension is designed to calculate earn value, cost progress and payment progress in Excel. In addition, the status of delay, over budget and unpaid works can be visualized in a color scheme in 3D model by a visual programming extension. Result shows that the proposed system is able to monitor cost and payment progress with visualization automatically.
DOI: 10.14457/cu.the.2016.101
title: ADSORPTION OF VOLATILE ORGANIC COMPOUNDS ON CARBON FIBER DERIVED FROM ELECTROSPUN RF-GEL

description: Toluene is a carcinogen and a pollutant. An adsorption using carbon fiber is a cheap and effective method in elimination of toluene. Resorcinol-formaldehyde gel (RF-gel) is a phenolic resin carbon precursor which provides carbon with outstanding properties. RF-gel fibers can be fabricated from twisted-wire needle-less electrospinning. Carbon fiber can be obtained from carbonization of RF-gel at 650, 750 and 850 ˚C. An increase in porosity of carbon fiber can be achieved from removal of disorganized carbon in pore structure via steam activation at 700, 800 and 900 ˚C for 30 minutes. Activated carbon fiber was used as an adsorbent in adsorption of toluene. An adsorption isotherm of carbon fiber shows the highest adsorption capacity up to 0.2 mg toluene/mg adsorbent. The adsorption capacity can be increased up to 0.3 mg toluene/mg adsorbent after the activation. And 1-Octanol adsorption was investigated for more detail in pore structure of carbon fiber.
DOI: 10.14457/cu.the.2016.102
title: EXTRACTION AND RECOVERY OF PALLADIUM AND PLATINUM ACROSS HOLLOW FIBER SUPPORTED LIQUID MEMBRANE

description: The extraction and stripping of palladium from flexible printed circuit board (FPCB) wastewater, and platinum from gold refining (GR) wastewater via hollow fiber supported liquid membrane were studied. In case of the separation of palladium, the extraction and stripping reached 96% and 91%, respectively by using 5%(v/v) LIX84-I dissolved in kerosene. Other conditions were feed solution at pH 2, stripping solution consisting of 0.8 M thiourea and 1 M hydrochloric acid, and flow rates of feed and stripping solutions at 100 ml/min. For the extraction of platinum, 96% extraction and 88% stripping were obtained by using 10%(v/v) Aliquat 336 dissolved in kerosene while other operating conditions were similar to the separation of palladium from FPCB wastewater. The separation factor of platinum in GR wastewater from palladium, gold, copper and zinc ions were approximately 17, 249, 970 and 1276, respectively. Additionally, natural solvents, i.e., sunflower oil, coconut oil and soybean oil were used instead of kerosene in the separation of platinum from GR wastewater. It was found that sunflower oil gave the highest platinum extraction, however, only 65% was attained compared with kerosene. In addition, the estimated mass transfer results of the extraction of palladium by the mathematical model based on diffusion, the reaction at the interface of feed and liquid membrane phases, and the accumulation of the metal ions in liquid membrane phase were obtained. The deviation from the experimental results was lower than 5%.
DOI: 10.14457/cu.the.2016.103
title: Improved Oil Recovery for Oil Reservoirs with Gas Cap

description: Current oil recovery method for a gas cap oil reservoir mostly involves gas reinjection. Gas reinjection is performed to supplement the reservoir energy, and to maintain oil production by sweeping oil towards the production well. The gas injection process also gives advantages of component exchange that occurs in the gas oil contact as the injected gas steam sweeps the oil in the reservoir. However, employing the strategy of gas reinjection does not necessarily guarantees high oil recovery efficiency, as the total amount of oil recovered depends on a wide range of reservoir characteristics as well as the production strategy. In this work, a compositional reservoir simulator was used to investigate the improved recovery capabilities of a light oil reservoir with gas cap by concept of gas reinjection into the reservoir. The study comprised of changing operational parameters such as oil flow rate, type of production well, time to initiate/stop gas injection and changing well positions to see how each parameter affects the oil recovery efficiency. The results showed that producing the reservoir at different flow rates for example at 500 stb/d compared to 2000 stb/d, the lower flow rate gave slightly higher oil recovery efficiency compared to the higher flow rate. With gas reinjection into the reservoir, the recovery efficiency was more than double the recovery efficiency obtained from natural depletion, in addition, the horizontal wells under gas reinjection schedule gave much higher oil recovery than vertical wells under similar conditions of oil production rate and gas reinjection specifications. Initiating the gas reinjection process from the start of production resulted in higher oil recovery than starting the gas reinjection process later on during production. Also, performing the gas reinjection process from start of production till end of production gave higher oil recovery than terminating the gas reinjection process at some point during production. Finally, placing the production well a longer distance away from the injection well gave much higher oil recovery than placing the injection and production well closer apart. Gas reinjection helped in sweeping the oil and reducing the oil saturation in the swept area by vaporizing the oil into produced gas.
DOI: 10.14457/cu.the.2016.104
title: Effectiveness of hydrologic models for streamflow prediction in the Nam Song River Basin

description: The Nam Song River is a tributary of the Nam Lik River. Itis one of the most attractive natural tourism places of Vientiane in Lao PDR. The Nam Song River basin has long been affected by natural disasters especially floods. The severity of major floods continues to increase in recent years. This is probably a result of changes in the pattern and amount of rainfall which is highly variable in monsoon regions. While realizing the importance of reliable predictions of streamflow and flood for improved water resources and disaster management in the Nam Song basin, this issue has remained a challenge due to scarce meteorological and hydrological gauges and unequally distributed of the gauges over the basin. To predict streamflow in data scarce basins, a rainfall–runoff modeling technique has been used as an alternative to observed streamflow data. The overall aim of this study is to assess the performance of rainfall-runoff models for streamflow predictions under the data scarcity. Three rainfall-runoff models, i.e. HEC-HMS, IFAS and SWAT, with different complexities were tested. The hydrological data were obtained from four rain gauges and two streamflow gauges. The period of the study was from 1996 to 2013. The training data set was from 1996 to 2004 for parameter calibration and sensitivity analysis. A testing data set was from 2005 to 2013 for validation of the model parameters. The performance of the models was evaluated at two temporal resolutions including daily and monthly scales. The correlation coefficient (r) and Nash-Sutcliffe efficiency (NSE) were used as performance indices. While all the rainfall-runoff models tested in this study performed equally well for predicting daily and monthly streamflow time series, they had different capabilities in prediction high flows that might lead to flooding. These results demonstrated that IFAS outperformed HEC-HMS and SWAT when predicting high flows. Therefore, IFAS was considered to be the most suitable rainfall-runoff model for the case of data scarcity in the Nam Song basin. This study could be improved further by searching for parameter sets that lead to increased accuracy of predicting other components of hydrographs apart from peak flows.
DOI: 10.14457/cu.the.2016.105
title: Comparative study of crude oil transportation

description: This comparative study applied the Analytic Hierarchy Process (AHP) to select the most suitable crude oil transportation methods that will align with the company's policy. The model enabled comparison of both quantitative and qualitative parameters involved in this decision making, which include cost factor, safety and reliability issue, environmental impact, and community acceptance survey. There are two transportation options to transfer crude oil from production station to the depot. First is the current practice using road tankers to carry crude oil using public highway. Current operation has many difficulties such as not reliable during flooding period, not being able to run at night time and also receiving complaints from nearby neighborhood. Hence, there was a proposal to install pipeline instead. However, high investment cost is required for pipeline installation and the company requires a reasonable judgment in order to sanction the project. From this thesis study, it was determined that pipeline installation is the most suitable transportation option based on the associated criterions stated above. The overall priority of pipeline installation option from Expert Choice program is 59% over that of 41% from road tanker method. The result was related to the company's safety policy to consider safety and reliability as first priority. The most critical parameter is the cost factor importance level since if varied more than +17.5%, the decision outcome will prefer the other option.
DOI: 10.14457/cu.the.2016.106
title: Ethanol dehydration over alumina catalysts with phosphorus and noble metal modification

description: The mixture of 1:1 volume ratio of gamma and chi crystalline phase alumina support was prepared via the solvothermal technique using the mixed solution between toluene and 1-butanol. The support was brought to modify with phosphoric acid and noble metal agents. These catalysts were investigated on the effect of both phosphorus loading and types of noble metal on catalytic characteristic and catalytic activity. The catalytic performance was identified through ethanol dehydration reaction in gas phase process at 1 atm and temperature of 200oC to 400oC. The results were found that the phosphorus modification had an effect on catalytic acidity by decreasing the amount of medium to strong acid sites and raised quantity of weak acid sites. The higher amount of weak acid brought the catalysts to demonstrate the higher catalytic activity through the ethanol dehydration to diethyl ether. The mixed phase of alumina supports modified with 5 wt% of phosphorus exhibited the highest catalytic activity among other P-modified alumina catalysts giving the diethyl ether yield of 34.41%. In addition, the different types of noble metal modification were found to have a significant effect on catalytic performance. The 5P/Al2O3 catalyst deposited by palladium showed the highest catalytic activity through all of the studied catalysts reached 57.68% of diethyl ether yield. The highest average yield of diethyl ether of 42.50% was obtained from using Pd5P/Al2O3 catalyst in time on stream system for 10 h. Despite of high diethyl ether yield obtained, both 5P/Al2O3 and Pd5P/Al2O3 catalysts had the lower coke formation when compared to non-modified alumina supports.
DOI: 10.14457/cu.the.2016.107
title: Evaluation of workplace oral health promotion in Kaengkhoi district, Saraburi province : a positive approach

description: This study implements a one-year workplace oral health promotion (WOHP) program in factories aiming to determine the impact on the oral health outcomes. Furthermore, it defines association among factory’s environment, behaviors and workers’ oral health status. Six factories in Kaengkhoi district of Saraburi province with less than 200 workers joined this study and defined to be a two factories of intervention I group (joined 1 year) and one factory intervention II group (joined after 6 months). The manager and head of the worker that participated in a small group discussion about the dental status of their worker were key person in the project. After that, they design and create oral health activities by themselves depending on their factory context. Six months later, they shared experience on oral health activity to each other.This study found the difference of dental caries and oral hygiene of workers among factories. Workers in factories that have wash basins for toothbrushing in toilets had 60% (IRR= 0.4 (0.2-0.9)) lower number of decayed teeth (DT score) and 7 times (OR= 7.0 (2.2-22.8)) more likely to have good oral hygiene compared with the other. Workers in medium size factories and those working in a factory that provided additional health insurance benefits were three times more likely to have good oral hygiene. After the intervention, oral health promotion activities occurring in Intervention I group were health education posters and morning talks, reminding to brush after lunch by the head of workers and limit of snacks in breaking period. The factory in intervention II group had only educational posters activity. At 6 months, Intervention I group obtained significantly higher scores of four knowledge and behavior items that are the frequency of tooth brushing, use of fluoride toothpaste, eating fruits habit and recommended drinks. At 1 year period, most of the changed behaviors still remain. For the workers in Intervention II improved their knowledge and behaviors on the frequency of tooth brushing and self-examination. Both Intervention groups obtained better behavior on examination by dentists compared to the control group. For managers and head of workers viewpoint, the workplace oral health promotion program was possible to launch only if it does not affect worker productivity. The managers thought that control of selling snack at convenience shop was impossible but to limit the time of snack break was easier.In conclusion, factory environments associated with workers’ oral health. This WOHP with participation can change factory environments and improve workers oral health knowledge and behaviors.
DOI: 10.14457/cu.the.2016.108
title: Fractal properties of bone trabeculae for implant stability evaluation

description: Objectives: This investigation aimed to explore the correlation between fractal dimension (FD) and two primary implant stability parameters: Implant stability quotient (ISQ) and Insertion torque (IT).Materials and methods: Patients, receiving implant placement at Faculty of Dentistry, Chulalongkorn University between 2011 and 2017, were screened according to study criteria. Demographic data of the patient and details of implant treatment were recorded. CBCT data acquired 6 months prior to implantation was used, while imaging related variables were documented. Paired t-test was applied between FD derived from areas emphasizing height and width. All possible affecting factors to ISQ and IT, including FD, were analyzed using univariate analysis. Subsequently, all factors with significant correlation were re-analyzed and adjusted with multiple linear regression. Results: There was no difference between FD values from the 2 areas. (p=0.779) ISQ values were significantly affected by implant diameter and jaw bones. (p &lt;0.001) No significant correlation was found between ISQ and FD. No confounding factor to IT was found. Significant correlation between IT and FD was revealed only in the mandible with a model: IT = 92.168 – 71.112(FD). (R2 = 0.145, p = 0.026)Conclusion: A significant correlation was shown between FD and IT in mandibular samples. No correlation between FD and ISQ was found under this study condition. Implant diameter and jaw type for implantation were found to influence ISQ value.