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Synthesis And Properties Of Acrylonitrile-Butadiene-Styrene Copolymer Containing Silica Nanoparticles, Charungkit Chaikaew
Synthesis And Properties Of Acrylonitrile-Butadiene-Styrene Copolymer Containing Silica Nanoparticles, Charungkit Chaikaew
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aim of this research is to develope acrylonitrile butadiene styrene composite reinforced with hydrophobic silica nanoparticles. In this study, in-situ synthesis of ABS rubber particles containing hydrophobic silica nanoparticles (HDTMS-silica) was carried out. Firstly, three of HDTMS-silicas (HDTMS-silica1, HDTMS-silica2, and HDTMS-silica3) were prepared by silanization of SiO2 nanoparticle with hexadecyltrimethoxysilane (HDTMS : SiO2 wt ratios of 1 : 1, 2 : 1, and 3 : 1) in an emulsion system. Then, HDTMS-silica/styrene and acrylonitrile mixture was fed into a polybutadiene latex reactor. Following that, graft copolymerization was carried out using persulfate initiator at temperature of 65 oC for 3.5 …
Surface Modification Of Microcrystalline Cellulose From Parawood Sawdust Via Mechanochemical Process For Reinforcement In Polypropylene Composites, Patcharaporn Chuayplod
Surface Modification Of Microcrystalline Cellulose From Parawood Sawdust Via Mechanochemical Process For Reinforcement In Polypropylene Composites, Patcharaporn Chuayplod
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of this study is to prepare and modify parawood microcrystalline cellulose (PW-MCC) for applying as reinforced material for polypropylene composites. PW-MCC was prepared from parawood sawdust using acid hydrolysis method with pulp to acid ratio at 1:15 and temperature at 80oC for 2 hours. The obtained PW-MCC exhibited the cellulose type I with CrI at 60%. Moreover, PW-MCC had higher thermal stability than parawood sawdust. PW-MCC was further modified with various types of coupling agent such as maleic anhydride-grafted-polypropylene (PP-G-MA), organosilane, and acid chloride. Vinyltrimethoxysilane and three different acid chlorides such as benzoyl chloride, hexanoyl chloride, and lauroyl …
Global Well-Posedness Of Reaction-Diffusion Equations With Non-Radial Kernel Function, Apassara Suechoei
Global Well-Posedness Of Reaction-Diffusion Equations With Non-Radial Kernel Function, Apassara Suechoei
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we study the following reaction-diffusion equation:[Equation] where f is a continuously differentiable function on R , α > 0 is a constant, [sumbol] is a continuous function and is non-radial kernel function. We establish the corresponding comparison principle. Then, we prove the local existence and uniqueness result based on the monotone iteration sequence technique. Finally, certain sufficient conditions on the local nonlinear term that guarantee the existence and uniqueness of global solution are specified.
Comparision Of Fly Ash And Metakaolin Based Geopolymer Properties For Heavy Metal Adsorption, Sujitra Onutai
Comparision Of Fly Ash And Metakaolin Based Geopolymer Properties For Heavy Metal Adsorption, Sujitra Onutai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This work aims to evaluate the effectiveness of fly ash and metakaolin based geopolymer powder and fly ash and metakaolin based geopolymer composite fiber as an adsorbent for removal of heavy metal ions from aqueous solution. The fly ash and metakaolin used as raw materials in this research was from Thailand. Fly ash based geopolymer (FAG) was synthesized by mix with an alkali solution. After that, the geopolymerization process was occurred and then cured geopolymer samples at 60oC for 24 h and left at 25 oC for 6 days. The fly ash based geopolymer was ground, washed and sieved through …
Boundedness Of Green Operators For Nonlocal Equations On Weighted Lebesgue Spaces, Itthinat Nuntajittanond
Boundedness Of Green Operators For Nonlocal Equations On Weighted Lebesgue Spaces, Itthinat Nuntajittanond
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research. we establish the local existence and uniqueness of solutions for the Cauchy problem of the nonlocal equation of the form ∂ₜU(x.t) = ∫R n J(x.Y)U(Y,t)dY – U (x.t) + (In(e + I x I2)) U p (x,t) where p > 1 and ∂ > 0 are constants. In this research, the kernel / of the nonlocal term may not radially symmetric. We investigate the Cauchy problem on weighted Lebesgue spaces with a logarithmic weight. One of the most important results in this thesis is the boundedness of the corresponding Green operator on the weight Lebesgue spaces. We also establish …
F-Cs-Rickart Modules, Julalak Kaewwangsakoon
F-Cs-Rickart Modules, Julalak Kaewwangsakoon
Chulalongkorn University Theses and Dissertations (Chula ETD)
No abstract provided.
Quotients Induced From Exponents Of Finite Commutative Rings, Kantapong Wannatong
Quotients Induced From Exponents Of Finite Commutative Rings, Kantapong Wannatong
Chulalongkorn University Theses and Dissertations (Chula ETD)
We use the concept of exponent of finite commutative rings to define the Carmichael quotients and the Carmichael quotients of degree d over polynomial rings over finite local rings, and then we give some congruence relations of these quotients. Moreover, we define the Carmichael quotients and the Wilson quotients over the ring of integers of number fields and study some congruence relations between them.
Non-Uniform Bounds On Normal Approximation Via Stein's Method And Exchangeable Pair, Kantapong Wannatong
Non-Uniform Bounds On Normal Approximation Via Stein's Method And Exchangeable Pair, Kantapong Wannatong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation consists of two parts. In the first, we improve the technique of Chuntee and Neammanee (2017) to obtain an exponential non-uniform bound on normal approximation for any random variables whose exchangeable pair can be constructed. Moreover, we give applications of the theorem to obtain non-uniform exponential bounds of normal approximations for sums of bounded independent random variables, the numbers of descents and inversions of permutation and combinatorial central limit theorem for real numbers. In the second part, we construct a new version of the Rosenthal inequality and improve the technique of Simcharoen and Neammanee (2016) to obtain a …
Anomalous Assemblage Detection Using Nearest Neighbor Distance, Kayyasit Singkarn
Anomalous Assemblage Detection Using Nearest Neighbor Distance, Kayyasit Singkarn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The outlierness of an instance in this thesis is defined based on the distance between two instances. For some datasets, outliers may not be isolated and formed small clusters. C-anomalous assemblage is a group of associated outliers having the number of instances less than or equal to C percent of the total instances. This thesis presents the anomalous assemblage detection algorithm called CND using a nearest neighbor distance for an anomalous score. The algorithm computes the index k equal to floor function of C percent times the total number of instances and uses the k-nearest neighbor distance for representing an …
Extreme Anomalous Clustering Algorithm, Panuruk Lisuwan
Extreme Anomalous Clustering Algorithm, Panuruk Lisuwan
Chulalongkorn University Theses and Dissertations (Chula ETD)
A clustering algorithm is a process of dividing data points into disjoint clusters according to the similarity of the data points. Many researchers have presented and developed the clustering algorithms to be suitable for the different characteristics of the datasets. Therefore, the concept of the identifying anomaly data points in the dataset was adopted in this thesis to explain the similarity of the data points. The main idea is to calculate the minimum distance between data points to identify the extreme anomalous score of all data points. In this thesis, a novel clustering algorithm is proposed called the Extreme Anomalous …
Measurement For Disordered Proteins Affecting Scale-Free Network, Satanat Kitsiranuwat
Measurement For Disordered Proteins Affecting Scale-Free Network, Satanat Kitsiranuwat
Chulalongkorn University Theses and Dissertations (Chula ETD)
No abstract provided.
Clifford Algebra-Valued Segal-Bargmann Transform, Sorawit Eaknipitsari
Clifford Algebra-Valued Segal-Bargmann Transform, Sorawit Eaknipitsari
Chulalongkorn University Theses and Dissertations (Chula ETD)
A classical Segal-Bargmann transform maps square-integrable functions on R to holomorphic square-integrable functions on C with respect to some Gaussian measure. In this work, we extend the classical Segal-Bargmann transform to functions taking values in a Clifford algebra. We establish that in this setting, the generalized Segal-Bargmann transform is a unitary isomorphism mapping Clifford algebra-valued square-integrable functions on Rⁿ with respect to some Gaussian measure to monogenic square-integrable functions on Rⁿ⁺¹ with respect to another Gaussian measure. We also discuss about the differential and multiplication operators in the monogenic functions space as well as certain properties of their domains.
Complete Convergence For Sequences Of Coordinatewise Widely Orthant Dependent Random Vectors In Hilbert Spaces, Teerayut Phutthanukool
Complete Convergence For Sequences Of Coordinatewise Widely Orthant Dependent Random Vectors In Hilbert Spaces, Teerayut Phutthanukool
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we introduce a new dependence concept for a sequence of random vectors taking values in real separable Hilbert spaces called coordinate-wise widely orthant dependence and extend the Baum-Katz Theorem to obtain complete convergence and complete moment convergence for a sequence of co-ordinatewise widely orthant dependent random vectors taking values in Hilbert spaces.
Strategies For Playing Closing Octagons Game In Some Situations, Thitiphut Leelathanakit
Strategies For Playing Closing Octagons Game In Some Situations, Thitiphut Leelathanakit
Chulalongkorn University Theses and Dissertations (Chula ETD)
Closing Octagons game is a combinatorial game for two players that we modify from Dots and Boxes game and Dots and Hexagons game. The game starts with an m × n array of octagons such that every two adjacent octagons has one common side and 0 points for both players. Two players alternately turn by the following rules. (i) A player moves by coloring one side of an octagon. (ii) A player who colors the eighth side of k octagons earns k points and takes one more move. The game ends when every side of octagons has been colored and …
Patterns Of Lines Intersecting On Plane, Wongtawan Chamnan
Patterns Of Lines Intersecting On Plane, Wongtawan Chamnan
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this work, we are interested in patterns of n lines on the plane such that lines produce M intersecting points. One famous related problem is called Fourier's 17 line problem. Although there are only a few known necessary conditions for realization, some arrangements may not even drawable. Consequently, we try to find more necessary conditions for this problem that can lead to possible arrangements and realize the arrangements. We provide a systematic algorithm to draw the possible arrangements. We establish lemmas for the direct drawing and find some certain cases of arrangements which are drawable. We also provide another …
Design And Development Of An Assistive Hand Device For Enhancing Compatibility And Comfortability, Siwakorn Toochinda
Design And Development Of An Assistive Hand Device For Enhancing Compatibility And Comfortability, Siwakorn Toochinda
Chulalongkorn University Theses and Dissertations (Chula ETD)
Currently, there are plenty of hand exoskeletons for rehabilitation and assistive purpose that have been developed. They have been designed for working with patient's limbs and can be used for hand positioning and executing task which help reduce therapist's workload and gives them an alternative way to rehabilitate patients. However, there are some patients with permanent impairment which cannot improve from rehabilitation further. Thus, portable assistive devices could greatly help them performing simple activities of daily living (ADL), but such device has not been fully explored yet, the present design of tendon routing cannot closely replicate finger orientation and motion …
Monitor Unit (Mu) Validation Using Various Types Of Dosimeters For Commissioning Small Field In Eclipse™ Treatment Planning System, Sammuel Mamesa
Monitor Unit (Mu) Validation Using Various Types Of Dosimeters For Commissioning Small Field In Eclipse™ Treatment Planning System, Sammuel Mamesa
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of this study was to investigate the differences of calculated MU between commissioning using corrected FOF from single detector and commissioning using average uncorrected FOF from three detectors. Measurements were carried out on 6 MV flattened photon beams from 1x1 cm2 to 10x10 cm2. Four detectors were utilized to measure depth doses and beam profiles: IBA CC01, IBA PFD, IBA EFD and Sun Nuclear EDGE. For FOF determination, Sun Nuclear EDGE was not used. The determination of FOF was classified into corrected FOF according to IAEA/AAPM TRS 483 and uncorrected FOF from three detectors. Commissioning was undertaken in …
The Determination Of Optimal Protocol For Digital Chest Tomosynthesis, Sarawut Tongkum
The Determination Of Optimal Protocol For Digital Chest Tomosynthesis, Sarawut Tongkum
Chulalongkorn University Theses and Dissertations (Chula ETD)
Recently, digital chest tomosynthesis (DTS) is introduced as alternative technique in digital chest radiography for evaluating pulmonary disease and enhancing the internal structures in different slices. However, the radiation dose is higher compared to general chest radiography. The present study was to determine the optimal protocol for DTS in order to reduce the radiation dose to patients while maintaining the image quality. The multipurpose chest phantom N1 "LUNGMAN'' was scanned by digital radiographic systems model Definium 8000.Such phantom was inserted with simulated nodules with size diameter of 3, 5, 8, 10, 12 mm, and the data were acquired using chest …
Ct Number And Electron Density Relationship For Photon Dose Calculation In Head And Neck, Chest, Spine And Pelvic Regions, Siriporn Wong
Ct Number And Electron Density Relationship For Photon Dose Calculation In Head And Neck, Chest, Spine And Pelvic Regions, Siriporn Wong
Chulalongkorn University Theses and Dissertations (Chula ETD)
CT images supply the HU information that relates to electron density (ρe). The ρe is important for tissue inhomogeneity correction for accurate dose calculation. The purpose of this study was to evaluate the dosimetric effect on CT images on different kVp setting using single HU-ρe curve. Anthropomorphic phantom was scanned using Siemens-SOMATOM Definition AS with 120 kVp setting and used as a reference image set. The procedures were repeated with DECT option (80/140 kVp), 80 and 140 kVp. The 120 kVp HU-ρe relationship curve from Gammex 467 tissue characterization phantom was created and applied into Eclipse treatment planning system. The …
Radiation Dose And Image Quality In Chest Region Using Single- And Dual-Energy Ct: Phantom Study, Taninchai Jutawiriya
Radiation Dose And Image Quality In Chest Region Using Single- And Dual-Energy Ct: Phantom Study, Taninchai Jutawiriya
Chulalongkorn University Theses and Dissertations (Chula ETD)
Chest CT examinations are routinely performed by using single energy protocol (SE). As CT had been evolved by using dual energy protocol (DE), the patients with underlying lung nodules or pulmonary nodules will be followed up by CT examination several times. The purpose of this study is to study the radiation dose and image quality between single-energy CT (SECT) and dual-energy CT (DECT) protocols in chest phantom at King Chulalongkorn Memorial Hospital. The Lungman Kyoto Kagaku phantom inserted by five simulated lesions of various diameters was scanned by dual-source CT system (Somatom Force, Siemens Healthineers). The acquisition protocols consist of …
Involvement Of Notch Signaling In Interleukin-4-Stimulated Human Macrophages, Naunpun Sangphech
Involvement Of Notch Signaling In Interleukin-4-Stimulated Human Macrophages, Naunpun Sangphech
Chulalongkorn University Theses and Dissertations (Chula ETD)
Macrophages respond to various stimuli, resulting in distinct effector phenotypes that range from LPS-stimulated proinflammatory to IL-4-activated pro-healing phenotype. The regulatory mechanism of this polarization is not fully understood. Notch signaling pathway is a conserved signaling pathway involved in polarization of macrophages, especially proinflammatory macrophages. However, the role of Notch signaling in IL-4 stimulated macrophages (M(IL-4)) is not well defined. PPARgamma is a signature nuclear receptor in M(IL-4) that function mainly in regulating lipid metabolism. There are many reports that revealed the interaction of Notch signaling and PPARgamma in various cells but not in macrophages. In this study, the interaction …
Characterization Of T Cell Secreted Cytokines And Cytotoxic Mediators Profiling In Knee Osteoarthritis Patients, Thitiya Sae-Jung
Characterization Of T Cell Secreted Cytokines And Cytotoxic Mediators Profiling In Knee Osteoarthritis Patients, Thitiya Sae-Jung
Chulalongkorn University Theses and Dissertations (Chula ETD)
Osteoarthritis (OA) is a chronic disease associated with morphological joint changes that results in the breakdown of joint cartilage and underlying bone with erosive inflammation. Factors of OA are intrinsic factor and extrinsic factor. The pathogenesis of OA relates with immune responses and immune cells, T cells, B cells, and macrophages etc., T cells both CD4+ and CD8+ T cell are immune cells that have been suggested to play a role in OA. However, we found many finding in CD8+ T cells such as a high proportion of CD8+ T cell was observed in tissue of knee joint. In addition, …
Induction Of Interleukin-1 Receptor Antagonist (Il-1ra) By Porcine Reproductive And Respiratory Syndrome Virus (Prrsv), Teerawut Nedumpun
Induction Of Interleukin-1 Receptor Antagonist (Il-1ra) By Porcine Reproductive And Respiratory Syndrome Virus (Prrsv), Teerawut Nedumpun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Porcine respiratory and reproductive syndrome virus (PRRSV) is one of the major pathogens affecting pig production industry worldwide. Impaired innate and adaptive immune responses are evidenced through the course of PRRSV infection. Several evidences indicate that PRRSV suppresses host immune responses via several immune evasion strategies. Interleukin-1 receptor antagonist (IL-1Ra) is known as an early inhibitory cytokine that suppresses innate immune functions and T lymphocyte responses. The aims of this study were to explore the induction of IL-1Ra by PRRSV and the negative immunomodulatory effects of PRRSV-induced IL-1Ra on porcine immune responses. In this study, the previous monocytes-derived dendritic cells …
Lipoic Acid-Incorporated Calcium Carbonate Nanoparticlesfor Controlling Of Adipose Derived Stem Cells (Adscs) Differentiation And Adipocyte Function, Sarocha Cherdchom
Lipoic Acid-Incorporated Calcium Carbonate Nanoparticlesfor Controlling Of Adipose Derived Stem Cells (Adscs) Differentiation And Adipocyte Function, Sarocha Cherdchom
Chulalongkorn University Theses and Dissertations (Chula ETD)
CaCO3 NPs has received a growing interest due to its potential properties as a safe drug carrier. The LA-CaCO3 NPs were synthesized by a chemical precipitation method and characterized using transmission electron microscopy, thermogravimetric analysis, and zeta potential measurement. We used LA-CaCO3 NPs to evaluate their therapeutic effects in lipid accumulation, lipolysis, adipogenesis, and adipokines expression in ADSCs and differentiated adipocytes. The average particle sizes were observed to be 10-20 nanometers. Thermogravimetric analysis results confirmed the percentages of LA in CaCO3 NPs. The zeta potential showed a negative charge -30.9 mV. Our findings indicated that LA-CaCO3 NPs were apparently more …
Evaluation Of Lipid Accumulation And Lipolysis Activity In Human Subcutaneous Adipocytes And Human Visceral Adipocytes By Α-Lipoic Acid, Α-Lipoic Acid-Incorporated Caco3 Nanoparticles And Caffeine., Sunisa Kaewdang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Recently, much attention has been paid to natural plant-derived compounds as an alternative strategy for developing anti-obesity agents with minimal detrimental effects. Among various natural compounds, caffeine (1, 3, 7-trimethyl xanthine) and alpha lipoic acid (1, 2-dithiolane-3-pentanoic acid; LA) are the natural agents which show a promising result in decreasing fat deposit. Moreover, we have improved efficiencies of LA by CaCO3 NPs because LA had low bioavailability. In the present study, we investigated the effect of combination between caffeine and LA-CaCO3 NPs in lipid accumulation reduction and lipolysis stimulation in human subcutaneous adipocytes and human visceral adipocytes. Our results showed …
Effects Of Curcumin On Oxidative Stress, Inflammation And Apoptosis In L-Arginine Induced Acute Pancreatitis In Mice, Thidarat Chingchit
Effects Of Curcumin On Oxidative Stress, Inflammation And Apoptosis In L-Arginine Induced Acute Pancreatitis In Mice, Thidarat Chingchit
Chulalongkorn University Theses and Dissertations (Chula ETD)
L-arginine (L-arg) is an amino acid that has been used to induce acute pancreatitis (AP) in mice. Curcumin is an active ingredient constituent of rhizomes of the plant Curcuma longa Linn. It has been used for the treatment of inflammatory conditions and shown to exhibit a variety of biological activities such as anti-inflammatory and anti-oxidant. The present study aims to examine the effects of curcumin on oxidative stress, inflammation and apoptosis in AP. Male ICR mice were randomly divided into 4 groups. 1) Control group, mice will be received i.p. of 1% DMSO as a vehicle. 2) AP group, mice …
Effect Of Calcium Citrate In Calcium Carbonate Nanoparticles On Hk-2 Cells In Acidic Environment, Tipagorn Udomsinsirikul
Effect Of Calcium Citrate In Calcium Carbonate Nanoparticles On Hk-2 Cells In Acidic Environment, Tipagorn Udomsinsirikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Metabolic acidosis exerts several cellular and tissue dysfunctions, such as increases mineral bone and protein degradation, induces inflammation, oxidative stress and cell death. These complications lead to multiple organ failure, including chronic kidney disease. Sodium bicarbonate and Shohl's solution are commonly used to treat metabolic acidosis. However, these agents cause frequent gastrointestinal adverse effects. Hence, we invented the new calcium carbonate nanoparticles to use as a drug delivery system for carrying citrate to renal cell which we hypothesize to reduce adverse effects of metabolic acidosis. We studied the physical characteristics and pharmacological effects of calcium citrate nanoparticle (Cacit) and calcium …
Theoretical Studies On Electronic Properties Of Curved Graphene Quantum Dots And Lithium Adsorption On Graphene Quantum Dots, Naruwan Pattarapongdilok
Theoretical Studies On Electronic Properties Of Curved Graphene Quantum Dots And Lithium Adsorption On Graphene Quantum Dots, Naruwan Pattarapongdilok
Chulalongkorn University Theses and Dissertations (Chula ETD)
Graphene quantum dots (GQDs), with their attractive properties, are of interest to apply for electronic devices. Therefore, this dissertation aimed to investigate the electronic of curved graphene quantum dots (CGQDs) and the adsorption of lithium on GQDs. For the first part, two shapes of flat GQDs, rhomboidal (RGQDs) and hexagonal (HGQDs), were modified to make CGQDs with different folding axes and angles. Stabilities and electronic properties of CGQDs were studied using PBE/DNP. The results showed that the deformation energies of GQDs depend on sizes and folding axes but not their shapes. HOMO-LUMO gap variations, both widening and narrowing the gap, …
Development Of Data Acquisition Technique For Computed Tomography Of Simplified Distillation Column Model As Used In Petroleum And Petrochemical Plants, Dhanaj Saengchantr
Development Of Data Acquisition Technique For Computed Tomography Of Simplified Distillation Column Model As Used In Petroleum And Petrochemical Plants, Dhanaj Saengchantr
Chulalongkorn University Theses and Dissertations (Chula ETD)
This dissertation propose the development of data acquisition technique for computed tomography of simplified distillation column model as used in petroleum and petrochemical industries. The aim of this dissertation is to apply the computed tomography technique to inspect the internal structure of distillation column regardless of complex system to move radiation detectors and source. The developed data acquisition technique allows the operator to move radiation detectors and radiation source by follow designed algorithm. The scanning data are reconstructed using filtered back projection algorithm to evaluate internal structure at the region of interest from cross sectional reconstructed image. In this dissertation, …
Development Of Technique For Screening Liquids In Unopened Bottle Using Low Energy X-Ray Transmission, Parkphum Orachorn
Development Of Technique For Screening Liquids In Unopened Bottle Using Low Energy X-Ray Transmission, Parkphum Orachorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Since August 2006 after the discovery of terrorists' attempts to explode airplanes with liquid explosives in United Kingdom, each airline passenger is allowed to carry only a maximum of 100 ml liquid in each container and a total of not more than 1,000 ml in carry-on luggage. This measure was adopted to prevent bringing sufficient amount of fuel oil, alcohol, hydrogen peroxide or other flammable and explosive liquids into the aircraft. In this research, X-ray transmission technique was experimentally investigated using low energy X-rays between 13.6 - 43.5 keV emitted from 238Pu radioisotopic source and linear attenuation coefficient of liquids …