cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2012.529
title: Evaluation of alternatives for petroleum production concession extension in Thailand

description: In assessing of alternatives for petroleum production concession extension in Thailand; the most important key factors in decision on petroleum production concession extension is the benefit-sharing between concessionaire and the government. The main factors used in evaluation of alternatives for petroleum production concession extension are the timing of extension of concession, and the volatility of petroleum prices. Evaluation of alternatives for concession extension, regardless of these factors, cannot bring about the best alternative results. The objective of this thesis is to study the effects of the timing of extension of concession, and the fluctuation of petroleum prices, in evaluation of alternatives for petroleum production concession extension under fiscal regime Thai I and Thai III. The study is divided into three parts: (1) to evaluate the alternatives for petroleum production concession under fiscal regime Thai I and Thai III, (2) to evaluate the alternatives for petroleum production concession by deferring the decision of concession extension using Real Options Valuation under the two fiscal regimes, and (3) evaluation of alternatives for petroleum production concession with regard to the impact of the volatility of petroleum prices. In the first study, it was found that in the decision of concession extension under fiscal regime Thai I, both concessionaire and the government’s returns were feasible similar to the decision of concession extension under fiscal regime Thai III. In the second part of the study, deferring the decision of concession extension under fiscal regime Thai I and Thai III resulted in lower returns for both the oil companies and the government. And, finally, in the last section, the gas price fluctuations enhance the volatility of profits. The volatility of profits under fiscal regime Thai III are less than the volatility of profits under fiscal regime Thai I for both the government and the concessionaire.
DOI: 10.14457/cu.the.2012.530
title: Influence of herbicides on morphology and population of rice frog Fejevarya limnocharis (Gravenhost, 1829) in paddy fields, Nan province

description: Herbicide utilization in agricultural area can lead to an environmental contamination and adverse effects on non-target organisms including amphibians. Screening for herbicide contamination (atrazine, glyphosate and paraquat) in paddy fields of Nan Province showed contamination of atrazine in water at the field with intensive herbicide utilization. The rice frog Fejervarya limnocharis living in agricultural area was thus used as a sentinel species to test for herbicide influence on non-target organisms. Frogs were field collected from a paddy field with intensive herbicide usage (a potential contaminated site) and a reference paddy field with no history of herbicide usage. Results of herbicide tissue residue analysis showed that detectable levels of these three herbicides were found in frogs from both sites with a significantly higher level of paraquat in the contaminated site animals. Results of morphometry and gravimetry of liver, kidney, gonad and body showed that frogs from the contaminated site had a significantly lower condition factor indicating potential impact on overall health of the frog, a significantly higher liver weight indicating potential exposure to xenobiotics detoxification, and a significant increase in ovarian weight compared to those of the reference site possibly due to effects of herbicide on ovarian growth. The results of fluctuating asymmetry analysis of four appendage bones showed that FAs of frogs from the contaminated site were significantly higher than those of the reference site indicating exposure to environmental stressor during developmental process of frog. Overall, site-related differences in health status, gravimetric parameters and fluctuating asymmetry indicate that herbicide utilization could pose adverse effects at different levels to this non-target organism. These results could be used as an early warning of environmental health hazards for other vertebrates living near the herbicide utilization area, including human.
DOI: 10.14457/cu.the.2012.531
title: Authentication of capsicum using chromatographic techniques and chemometric methods

description: The discrimination of the geographical origins and varieties of chili peppers by using chromatography and spectroscopy to separate and analyze capsaicinoids, volatile compounds, and TPC components of chili peppers were studied. The combination of multivariate techniques such as principal component analysis (PCA), cluster analysis (CA), and linear discriminant analysis (LDA) were applied to the analytical data to monitor the chili pepper profiles and construct a mathematical model to aid in the identification of the origins and varieties of the chili pepper samples. The chili samples were classified into 3 major groups include the hot chili peppers (Capsicum annum Linn.), the bird chili (Capsicum frutescens Linn.), and the chili spur pepper (Capsicum annuum Linn. Varacuminatum Fingerh.), based on their varieties and geographical origins. The result show that the content of capsaicin and dihydrocapsaicin of bird chili peppers has the greatest content (2.51- 5.31 g kg-1 and 0.74 -1.50 g kg-1 dry weight respectively), followed in order of decreasing concentration by hot chili peppers (1.35 - 3.10 g kg-1 and 0.52 - 1.06 g kg-1 dry weight, respectively), chili spurs pepper (0.11- 0.26 g kg-1 and 0.01 - 0.04 g kg-1 dry weight, respectively). The VOCs analysis showed that the volatile compounds of the three varieties of chili pepper samples have different qualities and quantities according to their varieties. In chili peppers from various origins have similar VOCs but different quantities. The total phenolic content analysis showed that the total phenolic content of the hot chili peppers (2.25 – 2.75 mg gallic acid/100 g FW) was higher than those of the others, whereas the bird chili peppers and the chili spur peppers were 2.00 – 2.27 mg gallic acid/100 g FW and 1.10 – 1.52 mg gallic acid/100 g FW, respectively. The discrimination of geographical origins and varieties of chili peppers samples indicated that CA can be clearly differentiated the varieties of chili peppers at distance 0.4 and the origins of chili peppers at distance 0.2-0.3. In PCA showed that all chili peppers sample clustered according to their variety and origins. Each of the varieties and origins of chili peppers have organic composition markers that are unique to each species. Original group of samples can be predicted with 100% correction by cross-validating LDA.
DOI: 10.14457/cu.the.2012.532
title: Simple method for mercury (II) determination using gold nanoparticles with 2- mercaptobenzothiazole

description: A method for mercury (ΙΙ) ions detection was developed by using 2-mercaptobenzothiazole (MBT) with gold nanoparticles (MBT-AuNPs). The MBT-AuNPs can be induced to aggregate in the presence of Hg(ΙΙ) ions resulting in the change in solution color from pink to purple. The solution was then analyzed by UV-VIS spectrophotometer at 680 and 530 nm. Parameters that affected the Hg(II) determination including gold nanoparticles concentration, MBT concentration, particles sizes of gold nanoparticles, reaction time were optimized. The detection of Hg(II) could be performed by using 0.25 mM AuNPs solution modified with 5.0 µM MBT solution with the total analysis time of 3 min. The suitable pH for Hg(II) determination was pH 4-5. A good linearity (R² = 0.99) was obtained for the determination of Hg(II) in the concentration range of 20-100 μg/L with the detection limit of 5 μg/L. The detection can be performed spectrophotometrically and visually.
DOI: 10.14457/cu.the.2012.533
title: Source apportionment of polycyclic aromatic hydrocarbons (pahs) in coastal sediments of phang nga province

description: Using PAHs as an environmental indicator is suitable for implications the anthropogenic influences on the Phang Nga coastal area. The concentration, composition and spatial distribution of PAHs were investigated in the study area. The total concentrations of the 13 PAHs were ranged from 11.9 to 272.0 ng g-1 dry weight, with an average of 57.1±35.7 ng g-1 dry weight. The distribution pattern of PAHs in the background group (Koh Phra Thong) can be characterized as pyrogenic in origin due to relatively higher contribution from HMW PAHs with 4~6 rings. In case of the hot spot group, the highest percentage of 5-6 ring PAHs was found at stations in front of Pakarang Cape, indicating fuel combustion or street run-off as the predominant sources. The diagnostic PAHs ratios and fingerprints indicated that the promising PAH sources might be originated from the traffic-related sources such as petroleum combustion, street dust, road paving asphalt, tires and leaking of petroleum used by shipping activities. In addition, application of the multivariate descriptive statistical techniques (e.g. HCA and PCA) also identified the three possible sources of PAHs to be road dust, fuel combustion and grass/wood combustion. As a consequence, all of the promising sources implied that this coastal marine have been impacted with high anthropogenic activities. However, the levels of PAHs in the study area did not exceed the ERM and should not cause acute biological damages, Although at one site D[a,h]A exceeded the ERL/TEL values only one station. Moreover, the PAHs results indicated that the 2004 Tsunami backwash played a key role in transporting anthropogenic PAHs to the sediment approximately 25 kilometers far away offshore.
DOI: 10.14457/cu.the.2012.534
title: Purification of biodiesel by adsorption with acid activated bentonite

description: The objective of this research is to activating bentonite with sulfuric acid for purification of biodiesel. In order to activating bentonite, the effects of sulfuric acid concentrations (0.1, 0.3 and 0.5 M), activating temperature (60 and 100 °C) and activating times (1-24 h) were studied. The optimal condition for activating bentonite was 0.1 M H2SO4 at 60 °C for 12 h. The characteristics of activated bentonite were characterized by BET, XRD and XRF methods. The specific surface area and average pore diameter of activated bentonite were 55.15 m2/g and 8 nm, respectively. The morphology of activated bentonite was unchanged. The chemical composition: MgO, CaO, Na₂O and K₂O, were slightly decreased from 3.68, 3.30, 0.83 and 0.75 to 3.42, 2.69, 0.10 and 0.65 %wt., respectively. In order to purify biodiesel, the effects of amounts of activated bentonite (1-10 %wt. of activated bentonite per g oil), mesh sizes (60-200 mesh) and contact times (10-30 min.) on soap removal were also studied. The optimal condition for removal of soap in biodiesel was 10%wt. of activated bentonite (80-100 mesh) per g oil at room temperature with stirring rate of 150 rpm for 20 min. The removal of soap in biodiesel was 72.30%. The adsorption isotherm was fit to Freundlich isotherm. The results showed that activated bentonite can be used for purifying biodiesel. The quality of biodiesel after purified by activated bentonite followed by water washing could meet the major specification of biodiesel standards.
DOI: 10.14457/cu.the.2012.535
title: Transient response of thermopiezoelectric finite composite cylinder

description: In this thesis, a complete solution of transient responses of a transversely isotropic thermopiezoelectric finite composite cylinder under axisymmetric boundary conditions is presented. In the formulation, the temperature field is governed by Fourier heat conduction and assumed to be fully uncoupled. A series solution of the temperature field is obtained first in a Laplace transform space. A potential function technique is then applied to decouple the thermoelectromechanical governing equations and their general series solutions are obtained via standard procedure. The general solution is presented in terms of Fourier-Bessel series of trigonometric and hyperbolic functions. The boundary value problems corresponding to uniform temperature and mechanical loading at the outer curve surface of the cylinder are presented. Two types of mechanicals loading are considered in the present study, i.e., constant and banded loadings. A selected numerical technique is adopted to efficiently perform the Laplace transform inversion of all quantities. Selected numerical results for thermopiezoelectric filed of a cylinder are presented for both transient and steady states. Influence of various governing parameters on the response of piezoelectric cylinder are investigated and discussed.
DOI: 10.14457/cu.the.2012.536
title: Synthesis of poly(phenyleneethynylene)s using calcium carbide

description: Our research focused on the development of the synthesis of poly(phenylene-ethynylene)s (PPEs) from primary chemical feed stock calcium carbide and aryl diiodides via the Pd-catalyst cross coupling reaction. The reaction proceeds smoothly at ambient temperature with all commercially inexpensive reagents to generate the PPEs in satisfactory yields (60-93%) after double precipitation with methanol. Moreover, a number of PPEs which containing various substituent such as butyloxy, octyloxy, ethyhexyloxy, methyl diethoxy and oxypropanol are successfully prepared in excellent yields (71-93%). The GPC data of the resulting PPEs show the narrow polydispersity index (PDI) vary from 2.0 to 2.5 and high degree of polymerization (DP) ranging from 35 to 130. When compare these data with the conventional method, it indicates that our PPE show equal or better properties in term of DP and PDI. Interestingly, NMR characterizations of PPEs indicate that no homocoupling of alkyne in the PPE structure suggesting defect free PPEs is obtained from this method. The photophisical properties of prepared PPEs are also investigated showing high quantum efficiency of the polymers (0.34 - 0.71).
DOI: 10.14457/cu.the.2012.537
title: Effects of annealing process on film surfaces grown by molecular beam epitaxy growth model with arrhenius law

description: Presently many researches focus on how to minimize roughness of a film surface. An annealing process is one of the most promising techniques which are used to reduce roughness of the grown surface after the deposition of an atom has ended because it provides thermal energy for atoms on the substrate to break bonds formed during its deposition and diffuse to other positions. Despite being commonly used experimentally, the annealing process is seldom included in growth simulation studies. The objective of this work is to study the role of annealing process on a film surface grown by Molecular Beam Epitaxy model when the law governing the diffusion rate in simulations follows the Arrhenius law. The simulation results agree with the experimental results that the film surface is smoother when the annealing process is applied. Moreover, studies of the film surface morphology, the interface width, and the correlation functions show that the roughness of the interface decreases as the annealing temperature is increased. This is because the chance for an atom to diffuse to positions with large coordination numbers increases significantly with temperature. However, at high temperature, the desorption rate of an atom is higher and the desorption process, which is usually neglected in simulations, can become significant. For this reason, we study the effect of desorption process on the film surface by comparing statistical properties of films grown with and without desorption of atoms. The results show that when the annealing temperature is above 900 K, global statistical properties of the film are not significantly affected by the desorption of atoms but the morphologies and local properties are distinguishable.
DOI: 10.14457/cu.the.2012.539
title: Blow-up of p-laplace heat equation on riemannian manifolds

description: Let M be an n-dimensional smooth manifold with boundary [สูตร] . Consider the initial-boundary value problems of the form [สูตร] where ∆p is the p-Laplace-Beltrami operator. We obtain conditions of the initial function u₀ in which the classical solution of the problem blows up in a finite time.
DOI: 10.14457/cu.the.2012.540
title: Plantwide control structure design for modified ethyl benzene process

description: In this thesis, plantwide control structure design of ethyl benzene (EB) process has been investigated. The ethyl benzene process incorporates the reaction of benzene with ethylene to form the desired EB product and the undesired di-ethyl benzene (DEB) by-product. The DEB is continuously recycled with no exit or recycled to “extinction’’ (no net DEB product produced). The optimum flowsheet is obtained from Luyben (2010). Two effective plantwide control structures are developed using Wongsri’s procedure. The main emphases of the procedure are establishing a fixture plant (material-balanced control and fixed process inputs) and disturbance management. An analysis of results shows that the design structures have better control performances compared to Luyben (2010).
DOI: 10.14457/cu.the.2012.541
title: Defect reduction in coating process of aluminium composite panel

description: This objective of this thesis is to reduce the defect in coating process of aluminium composite panel. From the research, Defect has the large amount. That is affected to production process in many activities. Due to continuous production process, it wastes time and cost from defect that affected production seriously. Researcher operated by cause definition, cause analysis, improvement, reduction and control in coating process. This research studied in detail of coating process of aluminium composite panel and found the factor that affect coating process. The most quantity of defect is colour unlikeness. Design of experiment is created with 2 factors. There are temperature inside oven and roller Gap. Experiment is tested by statistical method and found significant factor. Cause and Effect Analysis Diagram uses for defining the real cause and effect. Temperature inside oven is the significant factor. Researcher found related method and reduced defect in coating process. After adjustment, researcher checks the result by checking on top of aluminium coil and tail of aluminium. Before adjustment data and After adjustment data are compared and analysed After improvement of coating process, it found that defect from colour unlikeness case; reduce from 23.99% to 2.45%. It reduces to 21.54%, which compares with before improvement data. It can be calculated 87.78% after improvement.
DOI: 10.14457/cu.the.2012.542
title: Molecular epidemiology and evolutionary studies of human rhinovirus and enterovirus 68 in Thailand

description: Acute respiratory tract illness is respiratory diseases that affect the air passages frequently occurs in rainy and winter seasons causing many diseases such as common cold, pneumonia, bronchitis, and asthma exacerbation. Many kinds of virus have been well recognized associated with the respiratory diseases. Publications worldwide have reported on the emerging of human rhinovirus (HRV) species C in 2007 and the re-occurrence of human enterovirus 68 (HEV68), a rarely detected pathogen usually causes respiratory illness. At present, epidemiological data, clinical complication and evolutionary history regarding these viruses in particular on the Asia continent are still limited. To address these concerns, this study aimed to establish comprehensive population-based surveillances during 2006-2012 (n = 2083), and provided evidence for their impacts in childhood respiratory tract illnesses. Employing PCR approaches for common respiratory virus detection, our study revealed that 45% of enrollment children were infected with at least one viral agent, and HRV being one of the most common viruses detected with annual prevalence of 13.8%. Results displayed that infections by HRV in both of influenza-like illnesses and lower respiratory tract illness patients predominantly targeted very young children with viral pneumonia, bronchiolitis and wheezing were the common discharged summary. The majority of HRV species identified in Thailand was HRV-C (48%). In contrast to HRV, HEV68 prevalence was estimated at 1.4% with main target group in older children. No significant respiratory complication was found between number of case of HRV, HEV68 and other respiratory viruses. The activity of respiratory viruses identified in Thailand showed significantly direct correlation with the relative humidity. Taken all evidence together, this study suggested that respiratory viruses circulating in Thailand were widely diverse, and the epidemics profile displays species, season, and year variations as the consequence of less distinct among seasonal oscillation . Furthermore, results obtained from Bayesian MCMC analysis suggested that HRV-C was not a recently emerged human pathogen. Otherwise, it was probable the descendent of the closely related HRV-A for &gt;750 yrs, and at least presented in human community for 10 yrs. Analysis of evolutionary force sharped HRV and HEV68 diversification indicated, as similar to other picornavirus, the evolutionary status of these viruses were relatively stable and undergo with strong purifying selection.
DOI: 10.14457/cu.the.2012.543
title: Utilization of RVSI concept to evaluate the color constancy in photographic images

description: The color constancy is an important property of the human visual system to recognize objects properly. It was said that the color constancy did not take place in photographic images, but the recognized visual space of illumination RVSI theory predicted the color constancy to take place in photographic images if the images could be perceived as three dimensional scenes. A D-up viewer was constructed with which a photograph can be perceived as a 3D scene in the first experiment and it was shown that the color constancy in the photograph took place as for the real space. The matching technique of color impression of a real room and that of a photographic image was successively used to achieve the experiment. While one eye was used in the D-up viewer, two eyes were used in the second experiment where a stereoscope was employed. It was proved that the color constancy also took place in photographic images. In the third experiment the state of color adaptation of subjects was investigated by measuring the color appearance of an achromatic stimulus patch inserted in a photograph. The color appeared very vivid in spite of the fact that the stimulus was achromatic when the photographs were prepared under vivid orange or blue illumination. The color adaptation of the visual system in photographic images was confirmed. General discussion was made for three experimental results and it was concluded that the color constancy could take place in photographic images.