cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.14457/cu.the.2007.2108
title: Robust controller design for a rotary double inverted pendulum using linear matrix inequalities

description: The AUN/SEED-Net benchmark problem rendered at the field wise seminar in Bangkok, Thailand in 2006 is a rotary double inverted pendulum (RDIP). The primary objective of this research is to a design robust controller for the RDIP using Linear Matrix Inequalities (LMIs). The system is required to be stable at the upright unstable position regardless of some parametric uncertainties and disturbances. In addition, the minimization of a given criterion function must be considered. The effect of the disturbances on the system needs to be attenuated. The LMIs tool is a very powerful one in the study of design controllers. Many design problems can be cast as convex problems such as an LMI minimization problem and a robust stability test of closed-loop systems. This thesis is concerned with the design of a robust H[infinity] state feedback controller and a robust H[infinity] output feedback controller.
DOI: 10.14457/cu.the.2007.2109
title: Neural network-based optimal control strategy for a batch crystallization

description: This research presents the implementation of an optimal control with neural network predictor to control a batch crystallizer. Due to the limited understanding of nonlinear and complicated dynamics of crystallization processes, the optimal control which is a model-based control strategy may not perform well as expected. A further difficulty in batch process control is that product quality variables usually cannot be measured on-line and can only be obtained through laboratory analysis at the end of batch run. To overcome such difficulties, an artificial neural network model is developed based on input and output process data and integrated with the optimal control strategy for controlling a batch crystallizer. The formulated optimal control problem is solved by a sequential method in which the control profile is parameterized by using a piecewise constant function. The neural network is applied to predict the moment variables that represent a crystal product quality and the solution concentration within batch crystallizer. The batch crystallization of potassium sulfate production is chosen as a case study to demonstrate the proposed control strategy. The simulation results have shown that the recursive neural network-based optimal control gives a better control performance compared to a conventional linear cooling control technique.
DOI: 10.14457/cu.the.2007.2110
title: Performance analysis of an autothermal membrane reactor for hydrogen production from methane

description: An autothermal reforming reactor in which the couple of steam reforming with partial oxidation reforming carried out is studied for the production of hydrogen from methane. In the autothermal reforming reactor, the endothermic heat and part of the steam required for steam reforming are balanced by an exothermic oxidation. The autothermal reforming reactor is generally an adiabatic fixed-bed reactor in the presence of mixture of two different catalysts for partial oxidation and steam reforming reactions. However, with such a reactor configuration, the management of the heat integration of the two reactions is difficult. In this work, the performance of three different methane autothermal reforming reactors, i.e., a conventional reactor, a dual-bed reactor and membrane reactor is investigated by using a one-dimensional homogeneous and non-isothermal model. For the membrane reactor, different type of membrane, i.e., H[subscript 2]-selective membrane, O[subscript 2]-selective membrane and H[subscript 2]-O[subscript 2] selective membrane, is applied. Effect of various operating parameters on the efficiency of each reactor is evaluated in terms of methane conversion, H[subscript 2]/CO of product, hydrogen recovery yield and separation factor. Simulation results show that the H[subscript 2]-O[subscript 2] selective membrane reactor provides the best performance in terms of the increased methane conversion and the reduced hot spot problem.
DOI: 10.14457/cu.the.2007.2111
title: Towards governance reform : a critical review of foreign assistance to Burma/Myanmar

description: Burma receives a paltry amount of foreign assistance. This is because donors rescinded aid and devised new policies strictly limiting cooperation with the Burmese government in response to the military’s ruthless crackdown on protests in August 1988 and the junta’s subsequent failure to establish democracy. The little assistance that remains is primarily humanitarian. This paper begins with the premise that carefully considered, attentively applied, closely monitored aid can be effective in eventually bringing about governance reforms in Burma. But what foreign assistance strategies are most likely to improve governance in Burma and why? In answering this question, this paper evaluates different strategies according to the principal recipient of aid. Such recipients include: the State Peace and Development Council; local government and the civil bureaucracy; international agencies (UN and INGOs); community-based organizations inside Burma; nongovernmental organization in exile; or nobody. Key findings point to mixed results. The links between governance reform and foreign aid are tenuous, even in theory, but certain strategies seem to be able to promote and even provoke change. The strategies that channel aid to the SPDC or no one are most unlikely to bring about such change; however engagement with the civil bureaucracy, international agencies, community-based organizations inside Burma and nongovernmental organizations in exile has produced results, albeit on a relatively small-scale.
DOI: 10.14457/cu.the.2007.2112
title: Stabilities of a 3-dimensional sine functional equation

description: The stability of functional equations is currently active mathematical research problems. A number of research papers after the pioneer paper of Th. M. Rassias in 1978 were published. In this thesis, we study the solution of a 3-dimensional sine functional equation. cf (x)f(y)f(z) = f(x+y+z) – f(x+y-z) – f(x-y+z) +f(x-y-z) and investigate its stabilities. We consider it into two cases c = 0 and c [is not equal to] 0. For the case c [is not equal to] 0, it will be called the non-degenerate form. We can prove that its general solution is contained in the class of the general solution of the sine functional equation and we give its superstability. For the case c = 0, we will call the degenerate form. We get that its general solution is the same as that of the Jensen's functional equation and we prove the Hyers-Ulam-Rassias stability of the degenerate case then treat the Hyers-Ulam-Rassias stability and Hyers-Ulam stability as special cases.
DOI: 10.14457/cu.the.2007.2113
title: Effect of addition of aloe vera gel on synthesis of bacterial cellulose film by Acetobacter xylinum

description: In this thesis, the effects of addition of aloe vera gel on synthesis of bacterial cellulose film by Acetobacter Xylinum was studied due to the unique properties of both aloe vera gel and bacterial cellulose (BC), which might improve the physical and biological properties of the developed film. The mechanical property, equilibrium water content, porous structure, crystallinity index, and the growth of human skin cells on the biosynthesized film with the supplement of aloe vera gel at 0-50 percent-range (v/v) in the culture medium were investigated. From the study, the 30 percent addition of the BC-aloe vera gel showed the best combination for the film formation. The BC-aloe vera film was found to be more strengthen than the BC film. In addition, the interaction between BC fibrils and aloe vera gel could be illustrated from FTIR analysis. Furthermore, both of the mechanical properties and equilibrium water content of the BC-aloe vera film were found to be higher than those of the BC film. The average pore sizes of the BC-aloe vera were smaller than those of the BC film, but the surface area did not much increase from the latter. The crystallinity index of the BC-aloe vera film content at 30 percent was improved to 82.77. Additionally, the BC-aloe vera film had no toxicity and supported the growth and proliferation of human skin cells.
DOI: 10.14457/cu.the.2007.2114
title: Effects of chitosan on growth and production of rice Oryza sativa L. cv. Pathum Thani 1

description: Chitosan is a derivative of chitin (produced by deacetylation of the aceta amido group). Chitin is the principal component of the hard exoskeleton of shrimp, crabs and insects. Chitosan has become interesting not only because the abundant of crustaceans shells available from fishery industry, but also as a high potential natural material which can be used in various applications. Chitosan has ability to inhibit growth of certain bacteria and fungi which cause diseases in plants, induces plant defense mechanism, stimulates plant growth and enhances yield production. The objective of this study is to investigate the effects of chitosan concentrations on growth and yield production of rice Oryza sativa L. cv. Pathum Thani 1. Chitosan was prepared from crab shells and hydrolyzed by chitinase produced from Bacillus licheniformis SK-1. The percent of degree of deacetylation (%DD) and molecular weight of chitosan was determined. The chitosan prepared has 91 %DD and the molecular weight of 46 kDa. The effects of chitosan on seed germination, growth and yield production were investigated. Chitosan treatments consisted of four concentrations at 10, 20, 40, and 80 ppm, distilled water as a control. Chitosan did not affect seed germination. The difference among treatment was not significant. Chitosan increased plant height, leaf blade length and area, and rice straws dry weight. The most effective concentrations were 20 and 40 ppm. The study also found that chitosan treatment at 20, 40, and 80 ppm significantly increase panicles per plant when compared to the control (P&lt;0.05). Other results showed that total grain number and grain weight were increased of 3 to 5 % by chitosan treatment, where 40 ppm was the most effective concentration. This study suggests that chitosan at the concentration of 40 ppm had a potency to stimulate growth and increase rice yield. The effective application of chitosan on rice plants is dependent on the concentration and the application methods of chitosan.
DOI: 10.14457/cu.the.2007.2115
title: The criticle success factor analysis of the commercial rice husk biomass power plant in Thailand

description: The objective of this thesis is to identify the critical success factors of a commercial rice husk biomass power plant in Thailand as well as to provide the relevant recommendations and strategies to achieve each of the factors. The scope of the research covers the power plant within the entire region of Thailand with a rice husk as a primary fuel together with the research on the alternative secondary fuel. At the very first stage the data collection has been undertaken from various trustful sources named as academic journal, research report and information provided from the governmental department, academic seminar and expert interview. Afterward with all gathered data, the stage of the analysis involved, industry analysis, situation analysis and technical analysis were then carried out. Starting with the industry analysis via the aid of Porter’s 5 forces analysis to investigate for each of the force effecting the industry of rice husk power plant include a bargaining of a suppliers, bargaining of a customer, threat of a new entrants, threat of substitutes and the intensity of the existing competitors. Second by the situation analysis via the aid of SWOT analysis, include strength, weakness, opportunity and threat. Then lastly the technical analysis was then carried out to investigate for the most suitable alternative raw material and technology. From the result of the study based on all the analysis carried out as well as the suggestion and validation from all the relevant experts, the critical success factors of the commercial rice husk biomass power plant in Thailand could be formulated to be a location, seasonality, raw material, governmental and external support, technology, human resource, marketing, product development and financial support together with the recommendations and strategies to be employed to achieve each individual. This thesis is providing the guideline to increase the potential of the industry where the conformity to the factors provided could ensure the higher possibility of the success. Moreover the study could also be used as a guideline for the relevant deeply research as well as a research in the field of the critical success factor study.
DOI: 10.17632/73mcsjnnmj.1
title: Data for: STRATIGRAPHIC UPDATE, PALEOTECTONIC, PALEOGEOGRAPHIC, AND DEPOSITIONAL ENVIRONMENTS OF THE CRIXÁS GREENSTONE BELT, CENTRAL BRAZIL
DOI: 10.14457/cu.the.2007.2116
title: Heterogeneous catalysts for biodiesel production from high free fatty acid vegetable oil

description: A two-step catalyzed process consisting of esterification and transesterification reactions was employed for the efficient conversion of rice bran oil into fatty acid methyl ester (biodiesel) using acid and base catalysts. First, the heterogeneous base catalysts: MgAl hydrotalcites (Mg/Al molar ratio = 3 and 4), metal loaded on calcined MgAl hydrotalcites: M loaded MgAlO (M = K, Cs, Sr, Ba, La) as well as Mg(Al)La hydrotalcites, Mg(Al)LaO and rehydrated Mg(Al)La were synthesized and characterized by ICP, XRD, SEM, BET and FT-IR. Their basicity was measured by titration. To compare their catalytic activity, glyceryl tributyrate was used as a model compound for transesterification with methanol. The results indicated that among metal loaded mixed oxide, 1.5 wt% K loaded on MgAlO gave the highest conversion, however, metal leaching was also detected. Comparison between Mg(Al)LaO and rehydrated Mg(Al)La hydrotalcite, the results indicated that the rehydrated catalyst exhibited higher activity and less metal leaching. Crude rice bran oil having high free fatty acids (11.14%FFA) was chosen for the esterification and transesterification reactions with methanol. The series of the solid acid catalyst containing 15-80% of 12-tungstophosphoric acid (HPW) supported onto silica were synthesized and characterized by XRD, TPD and FT-IR. The activities of the acid catalysts on the conversion of FFA were determined. FFA can be reduced to less than 1.0% using 80 wt% HPW/SiO[subscript 2] catalyst when reaction was carried out at 70oC for 4 h using a 10:1 molar ratio of methanol to oil and a catalyst amount of 3 wt%. Then, the base catalyzed transesterification using the rehydrated MgAlLa hydrotalcite (La low) catalyst was performed at 100oC for 9 h with a 30:1 molar ratio of methanol to oil and a catalyst amount of 7.5 wt% to obtain biodiesel with 100% methyl ester content and 75% product yield.
DOI: 10.14457/cu.the.2007.2117
title: The potential of clean development mechanism for petroleum exploration and production industry in thailand

description: The increasing of Greenhouse Gas emission has the effect on the environment problem. The Clean Development Mechanism (CDM) is one choice of alternatives established by the Kyoto Protocol to assist the industrialized nations with commitments for reducing greenhouse gas emissions to meet their targets, and to promote sustainable development in the developing nations. In Thailand, CDM is important to the sustainable development including the transferring facilitate technology and knowledge from developed to developing countries. The CDM theme doesn’t focus on the supplementation of Certified Emission Reduction (CERs) trading between investor countries and the developing countries but interest in promoting of sustainable development of the country. In the petroleum Exploration and Production (E&P) industry, the amount of carbon dioxide has been emitting continuously from the past to the present. As the result of the GHG emission, it is necessary to find the methods or processes to reduce the amount of GHG emission to atmosphere. This study provides an overview of the CDM potential in Thailand for petroleum E&P industry by the study from the big source of gas emission located in the Gulf of Thailand. In addition, the study describes the potential of the CDM methodologies that suitable methodology including CDM background, structure, and project cycle, and examines the potential value for Thailand. The study concludes that Thailand has the potential for cleaning development mechanism project while the effect of investment cost still have many important roles for the project.
DOI: 10.14457/cu.the.2007.2118
title: The mechanism of TGF-beta 1-induced-MMP-9 expression in head and neck squamous cell carcinoma

description: Matrix metalloproteinase-9 (MMP-9) plays roles in cancer progression by degrading the extracellular matrix and basement membrane. Many growth factors including Transforming growth factor-beta1 (TGF-beta1) could induce MMP-9 expression. We demonstrated that TGF-beta1 induced MMP-9 mRNA and protein in human head and neck squamous cell carcinoma cell lines. Application of TGF-beta receptor type I inhibitor (SB505124) reduced the MMP-9 expression markedly. Whilst, inhibitor of Myosin light chain kinase (MLCK) could reduce the level of secreted MMP-9 in both the supernatants and cell lysate but not the level of MMP-9 mRNA. These suggested that MLCK might regulate MMP-9 expression post-transcriptionally. Application of SB505124 and siRNA Smad2/3 reduced the phosphorylation of myosin light chain (MLC) suggested that MLC is downstream to T-betaRI/Smad2/3 signaling pathway. In conclusion, these results describe a novel mechanism for the potentiation of TGF-beta1 signaling to induce MMP-9 expression via Smad and MLCK.
DOI: 10.14457/cu.the.2007.2119
title: Bimetallic doping of titanium dioxide for use in photocatalytic splitting of water

description: An attempt on the use of rice husk ash (RHA), an agricultural waste, as an adsorbent for the adsorption of humic acids from water was studied. Preliminary studies have been shown the feasibility of rice husk ash for humic acids removal from water. The adsorbents were characterized for its various phisico-chemical properties. Batch studies were performed to evaluate the influences of various experimental parameters such as contact time, pH and initial concentration on the adsorption of humic acids. Optimum conditions for humic acids adsorption were found as follows, 60 min equilibrium time and initial pH 3.0. Equilibrium data obtained have been found to agree with both Langmuir and Freundlich equations. The maximum adsorption capacity of rice husk ash was 2.7 mg/g, at pH 6.0. In addition, rice husk ash was modified with 3-aminopropyltriethoxysilane. Again, the adsorption behavior of the modified rice husk ash (RHA-NH[subscript 2]) was studied. Optimum conditions for humic acids adsorption were found to be 30 min equilibrium time and initial pH in the range of 3.0-4.0. The results showed that the adsorption capacity of the modified rice husk ash was higher than that of rice husk ash. Experimental data fitted well into the Langmuir equation and the maximum adsorption capacity was 8.2 mg/g, at pH 6.0. The column method was also performed. It was found that the prepared rice husk ash can be used in both batch and column methods for water treatment. The comparative efficiency of rice husk ash and commercial activated carbon to adsorb humic acids from water was studied. The result showed that adsorption efficiency of the new rice husk ash adsorbents was not significantly different from commercial activated carbon. The adsorbents were applied for humic acids removal from surface water.
DOI: 10.17632/2twf3z8jds.1
title: Data for: High- and low-latitude forcing on the south Yellow Sea surface water temperature variations during the Holocene
DOI: 10.17632/2zrfx9g2hp.1
title: Data for: STRATIGRAPHIC UPDATE, PALEOTECTONIC, PALEOGEOGRAPHIC, AND DEPOSITIONAL ENVIRONMENTS OF THE CRIXÁS GREENSTONE BELT, CENTRAL BRAZIL
DOI: 10.14457/cu.the.2007.2120
title: Removal of humic acids from synthetic wastewater by rice husk ash and modified rice husk ash

description: In this study, titanium dioxide was loaded with chromium together with either platinum or rhodium in attempt to improve its photocatalytic activity for water splitting. Titanium dioxide was synthesized via a sol-gel method and the metals were loaded by incipient wetness impregnation technique. The amount of chromium added was varied between 0 to 1 % (w/w), while the amount of the second metals (either Pt or Rh) added was fixed at 1 % (w/w). The catalysts were characterized by UV-visible diffuse reflectance spectroscopy, X-ray diffraction (XRD), nitrogen physisorption, transmission electron microscopy (TEM), and photoluminescence. Addition of chromium up to 0.05 % (w/w) enhanced the photocatalytic activity because chromium prevented recombination of photogenerated electrons and holes in titanium dioxide. However, when the amount of chromium added exceeded 0.05% (w/w), the photocatalytic activity decreased owing to overtrapping of charge carriers by chromium. Photoluminescence measurement also suggested that titanium dioxide loaded with 0.05 % (w/w) Cr, of which photoluminescence signal was the lowest, had the slowest recombination of charge carriers. Addition of chromium together with platinum or rhodium further increased the photocatalytic activity for water splitting. The catalysts that possessed the highest activity were titanium dioxide that was loaded with 0.01 % (w/w) Cr and 1 % (w/w) Pt or Rh. The optimal loading of the metals could be explained by the similar reason above. Furthermore, a synergy between chromium and the other metal was observed. The amount of hydrogen gas produced from photocatalytic water splitting over titanium dioxide loaded with chromium together with either platinum or rhodium was greater than the sum of the amount of hydrogen gas produced from the reaction over either metal alone.
DOI: 10.14457/cu.the.2007.2121
title: Bounds on a normal approximation for latin hypercube sampling

description: Let X be a random vector uniformly distributed on [0,1][superscript d] and let ƒ : [0,1][superscript d] → ℝ be an integrable function. An objective of many computer experiments is to estimate. μ = Eƒ(X)=∫[subscript 0,1][subscript d]ƒ(x)dx . Among numerical integration techniques, Monte Carlo methods are efficient and competitive for high-dimensional integration. The Monte Carlo's estimator for the integral μ is given by μ[subscript n] = 1/n Σ[superscript n][subscript i=1] ƒ (X[subscript i]) where X[subscript 1], X[subscript 2],...,X[subscript n] are random vectors on [0,1][superscript d] McKay, Beckman and Conover (1979) introduced Latin hypercube sampling(LHS) as an alternative method of generating X[subscript 1], X[subscript 2],...,X[subscript n]. In this work, we investigate normal approximation of error bounds in the distribution of μ[subscript n] based on a Latin hypercube sampling.