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2018

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Health Risk Assessment Of Inhalation And Dermal Exposure To Particle-Bound Polycyclic Aromatic Hydrocarbons Of E-Waste Dismantling Workers In Buriram Province, Thailand, Sarasanant Bungadaeng Jan 2018

Health Risk Assessment Of Inhalation And Dermal Exposure To Particle-Bound Polycyclic Aromatic Hydrocarbons Of E-Waste Dismantling Workers In Buriram Province, Thailand, Sarasanant Bungadaeng

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research mainly studied on the inhalation and dermal exposure concentrations of particle-bound polycyclic aromatic hydrocarbon (PAHs) that e-waste burning workers probably received during their work and further estimated the health risk assessment in both route of exposure. According to the obtained results, the total concentrations of PAHs on PM₂.₅-₁₀ ranged from 0.0703 to 20.9800 μg/m³. For PM₂.₅, the total concentrations of PAHs varied from 0.2669 to 89.9645 μg/m³. In the dermal dust samples, the total concentrations of PAHs on the particles before burning work ranged from 8.1072 to 253.6118 mg/kg with the average concentration at 95.3894 mg/kg. For the …

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System Dynamics Analysis On Municipal Solid Waste Management Under Flooding : Case Study Bangkok, Thailand, Nuchcha Phonphoton Jan 2018

System Dynamics Analysis On Municipal Solid Waste Management Under Flooding : Case Study Bangkok, Thailand, Nuchcha Phonphoton

Chulalongkorn University Theses and Dissertations (Chula ETD)

The municipal solid waste management service system has been one of the key service provisions to indicate the sustainability of the city as defined in Sustainable Development Goals - SDGs #11. Complex linkages of stock and flow within the system are impacted by waste quantities and spatial characteristics. The complex characteristics make it difficult to design a sustainable management system, particularly in case of a disaster. Flooding is a major natural disaster in many regions of the world and poses a challenge as an external disturbance that can affect any part of the waste management system. Flood mitigation plans are …

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Conversion Of Waste Chicken Fat To Liquid Fuel On Coal Fly Ash Catalyst By Catalytic Cracking, Phorndranrat Suchamalawong Jan 2018

Conversion Of Waste Chicken Fat To Liquid Fuel On Coal Fly Ash Catalyst By Catalytic Cracking, Phorndranrat Suchamalawong

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this research work, a study on the catalytic cracking of waste chicken fat (WCF) on fly ash to liquid fuels and using 2k factorial design to determine the influence of parameters on liquid yield, naphtha and diesel content was investigated. The research was divided into 2 parts. First, the experiment was carried out in a batch lab scale reactor of 70 mL. The objectives are to determine the influence of parameters that affected the %yield of liquid product naphtha and diesel–liked fuels at the operating conditions of temperature range of 420 - 460 ˚C, reaction time 45-75 minutes, initial …

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Comparison Of The Accuracy Between Digital And Conventional Impression In Different Multiple Implant Angles At Posterior Mandibular Region Using Innovation 3d Super Imposition Software Program; In Vitro Study, Arisa Hongsopa Jan 2018

Comparison Of The Accuracy Between Digital And Conventional Impression In Different Multiple Implant Angles At Posterior Mandibular Region Using Innovation 3d Super Imposition Software Program; In Vitro Study, Arisa Hongsopa

Chulalongkorn University Theses and Dissertations (Chula ETD)

Statement of problem: This study aims to compare the accuracy of three-dimensional changes in position and angulation between digital and conventional impression techniques in different angulated implants at the mandibular partial edentulous area with the use of a mandibular partial edentulous reference model with 4 dental implants in different angulations (15 degrees buccally,lingually, mesially, and distally). Conventional and digital impression techniques were used for master model and fabricated 15 conventional master casts and 15 three dimensional printing models. Each scan body was connected with implant or analog to transfer implant positions. All of the master model, master casts, and printing …

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Ecological Impacts Of Fishing Gears In Ko Chang, Trat Province, Thailand, Wichin Suebpala Jan 2018

Ecological Impacts Of Fishing Gears In Ko Chang, Trat Province, Thailand, Wichin Suebpala

Chulalongkorn University Theses and Dissertations (Chula ETD)

Knowledge of ecological impacts of fishing, especially in small-scale sector, is not always readily available, making it difficult to employ an ecosystem-based approach to fisheries management and to achieve sustainability. The topic of this dissertation was formulated with the aim to enhance this knowledge through conducting researches in Mu Ko Chang, Trat Province, the Eastern Gulf of Thailand. This study focuses on two main types of impacts, i.e. bycatch and habitat damages, consisting of three research modules: 1) assessing existing knowledge and analyzing the knowledge gap regarding bycatch and habitat impacts of fishing methods in Thai waters; 2) investigating fishing …

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Using Of Low Modulus Of Elasticity Base In High C-Factor Resin Composite Restoration: An In Vitro Study, Jomnang Yoohun Jan 2018

Using Of Low Modulus Of Elasticity Base In High C-Factor Resin Composite Restoration: An In Vitro Study, Jomnang Yoohun

Chulalongkorn University Theses and Dissertations (Chula ETD)

This in vitro study aims to investigate whether or not using a resin modified glass ionomer as a base or intermediate layer would improve marginal integrity of a high C-factor class V resin composite restoration. Eighty non-carious human third molars were used. A box-shaped, 5x3x2.5 mm3, Class V cavity preparation was placed on buccal surface at the cementoenamel junction. Teeth were then randomly assigned to 8 experimental groups (n=10): group 1, Resin composite (FiltekTM Z350 XT); group 2, FiltekTM Bulkfill; groups 3 and 4, resin composite with FiltekTM Z350 XT Flowable as base; groups 5 and 6, resin composite with …

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Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich Jan 2018

Comparison Of Three Dimensional Accuracy For Surgical Guided Template Fabrication Using Two Different Implant Planning Software Programs, Natchaya Thitaphanich

Chulalongkorn University Theses and Dissertations (Chula ETD)

Statement of problem: Static computer-assisted implantation system (s-CAIS) has been introduced to implant dentistry for decades. According to previous studies, they were recognised the inaccuracies of actual implant position placed via using static computer-assisted implantation system. These inaccuracies result from an accumulation of every step in the workflow from planning to accuracy assessment. Recently, there are multiple implant planning softwares available. coDiagnostiXTM software and Implant StudioTM software are widely used third-party implant planning softwares which claimed to provide predictable implant placement outcome. However, the effect of softwares used on accuracy of guided surgery in anterior maxilla region has not been …

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Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana Jan 2018

Fracture Resistance Of Endodontically Treated Premolars With Deep Cervical Lesion Restored With And Without Post In Different Restorations, Phrohphrim Suebsawadphatthana

Chulalongkorn University Theses and Dissertations (Chula ETD)

Objectives: The purpose of this study was to evaluate the effects of fiber posts and different restorations on the fracture resistance of endodontically treated maxillary premolars with cervical cavities. Methods: In forty extracted human first maxillary premolars, cervical cavities were prepared simulating cervical lesions and randomly divided into four groups (n=10): COM-NP, endodontically treated teeth (ETT) restored with resin composite without fiber posts; ON-NP, ETT restored with CAD/CAM ceramic onlays without fiber posts; COM-P, ETT restored with resin composite and fiber posts; and CR-P, ETT restored with CAD/CAM ceramic crowns and fiber posts. After the fiber posts and restorations had …

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Comparison Of Microtensile Bond Strength Of Universal Adhesives Utilizing Various Application Methods: An In Vitro Study, Suthatta Jeansuwannagorn Jan 2018

Comparison Of Microtensile Bond Strength Of Universal Adhesives Utilizing Various Application Methods: An In Vitro Study, Suthatta Jeansuwannagorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: To investigate microtensile bond strength (μTBS) of a conventional three-step etch and rinse, and universal adhesive systems with etch and rinse mode utilizing various application methods at 24 hour and after 6 month water-­storage. Material and methods: Seventy-­two extracted human third molars were cut to expose a flat dentin surface. Optibond FL (OFL; Kerr, USA), Single Bond Universal (SU; 3M ESPE, USA), Clearfil Universal Bond Quick (CU; Kuraray Noritake Dental Inc., Japan), G-­Premio BOND (GP; GC Corporation, Japan), Prime&Bond Universal (PB; Dentsply, Germany) were used in etch and rinse mode following the manufacturers' instruction and double application method. Subsequently, …

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Relationship Between Maxillary Anterior Alveolar Arch Form And Tooth Root Axis In Class I Occlusion: A Cone Beam Computed Tomography Study, Suweera Petaibunlue Jan 2018

Relationship Between Maxillary Anterior Alveolar Arch Form And Tooth Root Axis In Class I Occlusion: A Cone Beam Computed Tomography Study, Suweera Petaibunlue

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: This study determined the relationships of the angulation between tooth root axis and alveolar bone axis to the anterior alveolar (AA) arch forms and the sagittal root position (SRP) classification in anterior esthetic region using cone-beam computed tomography (CBCT) images.
Materials and Methods: CBCT images which met the inclusion and exclusion criteria were classified according to a novel classification of AA arch forms (Bulyalert 2018) and a SRP classification (Kan 2011). Then, the angulations of the root axis and the alveolar bone axis were measured using the mid-sagittal CBCT images of each tooth. The relationship of the angulations in …

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Mutual Fund Performance And Persistence Evaluationevidence From Thai Local And Foreign Luxembourg Ucits, Bruno Fourquin Jan 2018

Mutual Fund Performance And Persistence Evaluationevidence From Thai Local And Foreign Luxembourg Ucits, Bruno Fourquin

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper aims to compare the performance and persistence of equity Mutual Funds between Luxembourg equity UCITS (Undertakings for Collective Investment in Transferable Securities) and Thai equity Funds that are investing a minimum of 90% of their total portfolio in Thai equity market during a 5 years period (May 2013- April 2018). The tests are conducted via (i) static or unconditional measures including the Sharpe, Treynor, Jensen ratios; (ii) dynamic or conditional measures using Treynor-Mazuy, K. Shukla and Gregory B. van Inwegen indicators; (iii) control - robustness measures with Brown and Goetzmann, Murthi et al. performance persistence indices. The paper …

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Volume Components And Return Predictability In Abnormal Trading Events, Jetarin Charoenpornpoj Jan 2018

Volume Components And Return Predictability In Abnormal Trading Events, Jetarin Charoenpornpoj

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper examines return predictability of three types of trading volumes include total volumes, buy volumes and sell volumes in Thailand's stock market between 2012 to 2018. To measure predictability ability, we sort securities into group base on the level of trading volumes and type of volumes. We test and confirm that buy volumes and sell volumes can predict return one day after the abnormal trading event. Abnormal high buy volumes can predict positive next day return of that security while abnormal high sell volumes can predict negative next day return. In addition, we test and found that positive return …

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Why Stock Distribution Announcement Causes Abnormal Return, Napas Chailapakul Jan 2018

Why Stock Distribution Announcement Causes Abnormal Return, Napas Chailapakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research investigated empirically why stock distribution announcement causes abnormal return. For stock split companies, the evidences support that liquidity improvement could be the first possible reason of occurrence of abnormal return during announcement date. The main groups of investors who increase their trading activity are retail and foreign investors. This study also presents another reason that is the occurrence of abnormal return during effective date. It is possible that this abnormal return comes from the increasing of buying demand flow during effective date. However, this study does not discover the evidence which support those two reasons in stock dividend …

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Essay On The Stickiness Of Selling, General, And Administrative Cost, Phattraphol Anekpong Jan 2018

Essay On The Stickiness Of Selling, General, And Administrative Cost, Phattraphol Anekpong

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper provided evidences that costs management is affected by many factors and investors can use this knowledge to analyze the firm's cost management practices. Selling, General, and Administrative Costs (SG&A) appears to be sticky and showed that costs management is asymmetric. The cost stickiness occurs when the SG&A costs decrease by smaller percentage with revenue decrease compare to SG&A costs increase with revenue increase. This paper explored various factors that might have influence on the stickiness of SG&A costs using linear regression. Factors such as managerial ownership and ownership concentration are found to decrease cost stickiness in different periods. …

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The Effects Of Increased Transparency On Market Liquidity : Empirical Evidence From Thai Bond Market, Tanamard Patana-Anek Jan 2018

The Effects Of Increased Transparency On Market Liquidity : Empirical Evidence From Thai Bond Market, Tanamard Patana-Anek

Chulalongkorn University Theses and Dissertations (Chula ETD)

To increase transparency, Thai Bond Market Association (ThaiBMA) issues the notification of disclosure of transaction information and control for post-trade deferred publication. Dealers are required to report all required trading information to ThaiBMA within 30 minutes after execution for public dissemination. The rules are issued for improved the market efficiency and increased customer activity. Moreover, ThaiBMA issues the penalty for Late Transaction to punish dealer. However, increasing transparency leads to an improvement on market liquidity. This paper examines the effect of post-trade transparency on market liquidity in the Thai bond market, measured by bid-offer quoted in terms of their yield …

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Mergers And Acquistion : The Effect Of Announcement Date On Abmormal Return In Asia, Theedanai Snguanwongchai Jan 2018

Mergers And Acquistion : The Effect Of Announcement Date On Abmormal Return In Asia, Theedanai Snguanwongchai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Merger and acquisition (M&A) is an ideal option to reduce business's risk of investment, gain stronger market penetration and wealth maximization. In this study, event study was performed to see the effect of abnormal return from M&A on Asian countries, including Indonesia, Thailand, Malaysia, Hong Kong and Singapore with sampling period between 2010 to 2017. From the result of the test, it was found that M&A creates positive value for acquirer firms in Asia. The semi strong form of Efficient Market Hypothesis (EMH) was examined by looking at the leakage of information prior to the announcement and market's reaction after …

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Doctoral In Creative Music Research : The Musical Dialect In Modern Conventional Idiom Of The Piano Concertos, Paulo Ricardo Soares Zereu Jan 2018

Doctoral In Creative Music Research : The Musical Dialect In Modern Conventional Idiom Of The Piano Concertos, Paulo Ricardo Soares Zereu

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research aims to explore the musical dialect within the conventional idiom as well as the interpretational approach and analytical overview of the selected Piano Concertos. The three prominent and significant Piano Concertos were chosen as followed: 1) Concerto in E-flat major for Two Pianos and Orchestra, KV. 365 by Wolfgang Amadeus Mozart (1756-1791), 2) Concerto in C major for Piano, Violin, Cello, and Orchestra, Op.56 by Ludwig van Beethoven (1770-1827), and 3) Concerto for Two Pianos and Orchestra in D minor by Francis Poulenc (1899-1963). The research also presented the innovative revolutionary of the pianistic and interpretational challenges of …

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Development Of Value Added Unripe Papaya Flour From Waste Product Of Fruit Industry, Waralee Joymak Jan 2018

Development Of Value Added Unripe Papaya Flour From Waste Product Of Fruit Industry, Waralee Joymak

Chulalongkorn University Theses and Dissertations (Chula ETD)

Papaya fruit (Carica papaya L.) belonging to Caricaceae family is recognized as a good source of dietary fiber and antioxidants. The objective of this study was to develop the unripe papaya flour (UPF) from waste fruit product. The study was also investigated physicochemical, functional properties of UPF and its addition of pancake. First, the small pieces of unripe papaya were heated by hot air oven, then ground by using a high-speed universal grinder and sieved through a 100-mesh sieve. The particle size of UPF was 140.8±2.1 µm with randomly irregular shape. The hydration properties of UPF was higher than wheat …

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Effect Of Bitter Gourd Extracts On The Mutagenicity Of 1-Aminopyrene Reacted With Nitrite Using Ames Test, Korkiat Panpasuk Jan 2018

Effect Of Bitter Gourd Extracts On The Mutagenicity Of 1-Aminopyrene Reacted With Nitrite Using Ames Test, Korkiat Panpasuk

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study was conducted to investigate the mutagenic activity of raw and cooked bitter gourd (Momordica charantia) including raw fruit extract (RW), blanching water (BW), hot water extract from blanched fruit (HB), stir-fried fruit extract (SF), and stir-fried fruit (pre-squeezed with salt) extract (SS). In addition, the effects of extracts in modifying the mutagenic activity of mutagen freshly prepared by the reaction between 1-aminopyrene and sodium nitrite and the effects when adding each extract at the beginning of the same reaction using Ames test on Salmonella typhimurium strains TA98 and TA100 without enzymatic activation were also determined. The data for …

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Antioxidant And Antimutagenic Activity Of Extracts From Pericarp And Seed Of Zanthoxylum Limonella Alston, Patamawan Wipoosanapan Jan 2018

Antioxidant And Antimutagenic Activity Of Extracts From Pericarp And Seed Of Zanthoxylum Limonella Alston, Patamawan Wipoosanapan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study was conducted to investigate the antioxidant and antimutagenic activity of Zanthoxylum limonella seed extract and that of Z. limonella pericarp extract. The total phenolic contents and antioxidant activity assay including DPPH assay and FRAP assay were performed. The results showed that the antioxidant activity of pericarp extract was higher than that of the seed extract. The direct mutagenicity assay was determined, with and without nitrite treatment using the Ames test towards Salmonella typhimurium strains TA98 and TA100. The mutagenic modification assay was performed by measuring the interfering effect of the pericarp extract and the seed extract on the …

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Preparation And Antimicrobial Activity Of Caprylic Acid Emulsion For Food Coating, Raweewan Bunyovimonnat Jan 2018

Preparation And Antimicrobial Activity Of Caprylic Acid Emulsion For Food Coating, Raweewan Bunyovimonnat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Antimicrobial food coating is the interesting method for food preservation, especially in fruits and vegetables. Previous studies have been reported that the caprylic acid had the antimicrobial activity against a variety of microorganisms. However, little research has been conducted on the use of caprylic acid in the form of food coatings. Therefore, this study aims to determine the optimum conditions for the caprylic acid emulsion preparation and to evaluate the antimicrobial activity of the emulsion, including the effect of food coatings with caprylic acid emulsion on physical properties and microbial growth inhibition. Emulsions containing 4% w/v caprylic acid (oil) and …

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Carbohydrate Content Of The Medications For Epileptic Children Treated With Ketogenic Diet At King Chulalongkorn Memorial Hospital, Thanarat Sawangrit Jan 2018

Carbohydrate Content Of The Medications For Epileptic Children Treated With Ketogenic Diet At King Chulalongkorn Memorial Hospital, Thanarat Sawangrit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purposes of this study were to establish a database of the carbohydrate content of medications and investigate carbohydrate content of medications in epileptic children treated with ketogenic diet (KD) at King Chulalongkorn Memorial Hospital. One hundred sixty-nine KD order forms in 3 events (KD initiation, follow-up visit, and hospital re-admission) for epileptic children whose aged younger than 18 years old during 2009-2017 were selected. Clinical and nutritional data were obtained from medical records and KD order forms from the pediatric nutrition unit. The study showed that oral liquid dosage forms had the highest carbohydrate content in the formulations as …

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Application Of Konjac Glucomannan To Encapsulate And Stabilize The Curcumin In Milk System, Afwa Hayuningtyas Jan 2018

Application Of Konjac Glucomannan To Encapsulate And Stabilize The Curcumin In Milk System, Afwa Hayuningtyas

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study investigated the influence of different concentration of konjac glucomannan (KGM) (0, 0.1, 0.2, 0.3 % (w/v)) on the stability of curcumin emulsion in milk system containing 10%, 20%, and 30% (v/v) oil volume fraction. The data of creaming index, curcumin concentration, apparent viscosity, and color were obtained to investigate the stability of the system. Emulsions that reached the physical stability until 14 days of storage at 4ᵒC were subjected to further analysis including antioxidant, particle size, zeta potential, and bioaccessibility by the simulated gastrointestinal tract (GIT). The result suggested that increasing KGM concentration significantly increased the viscosity of …

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Étude De L'Espace Dans Les Contes De Fées De Madame D'Aulnoy : De L'Enfermement À L'Émancipation, Vanichcha Kanchanobhas Jan 2018

Étude De L'Espace Dans Les Contes De Fées De Madame D'Aulnoy : De L'Enfermement À L'Émancipation, Vanichcha Kanchanobhas

Chulalongkorn University Theses and Dissertations (Chula ETD)

Dans les contes de fées de Mme d'Aulnoy, l'espace est étroitement lié à la sexualité. L'Éros constitue un mobile capital qui pousse un personnage à en enfermer un autre. La prison affecte la sexualité du prisonnier. L'évasion de la prison relève de la question de la vie et de la mort. Une tentative ratée est punie : le châtiment va de la déshumanisation au trépas. Le Thanatos constitue le seul moyen qui permet l'émancipation. S'évader du clos et se retrouver dans l'ouvert permettent une libération sexuelle, et aussi une maturité pleinement développée. Néanmoins, certains désirs sexuels tendent plutôt à s'épanouir …

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Seismic Characteristics Of Paleo-Pockmarks At Great South Basin, New Zealand, Arunee Karaket Jan 2018

Seismic Characteristics Of Paleo-Pockmarks At Great South Basin, New Zealand, Arunee Karaket

Chulalongkorn University Theses and Dissertations (Chula ETD)

Paleo-pockmarks and present-day pockmarks are founded in several varieties both onshore and offshore worldwide. These features can be used as an indicator of fluid flow process which expulses through an unconsolidated sediment within the basin. The Great South Basin, New Zealand is one of the basins that paleo-pockmarks are observed covering the southeast offshore of South Island at around 1.5 s (TWT) depth beneath the surface. This study aims to identify seismic characteristics of paleo-pockmarks in the Great South Basin and predict the possible fluid origins and their mechanism. The numerous paleo-pockmarks are identified and imaged by using 3D seismic …

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The Influence Of Geological Structure On Stratigraphic Development During Multiphase Rifting In The Songkhla Basin, Gulf Of Thailand, Jidapa Phoosongsee Jan 2018

The Influence Of Geological Structure On Stratigraphic Development During Multiphase Rifting In The Songkhla Basin, Gulf Of Thailand, Jidapa Phoosongsee

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Cenozoic N-S trending Songkhla rift basin, located in the southwest Gulf of Thailand, was developed as a predominantly orthogonal extended half graben structure. The half graben is controlled by a boundary fault zone on the western side of the basin, which forms a series of N-S to NNE-SSW, east-dipping normal faults. The rift spans two phases of rifting; the Eocene-Oligocene and the Oligocene-Miocene phases, the late syn-rift to post-rift transition occurred from the late Early Miocene to Middle Miocene. The main clastic hydrocarbon reservoirs in the basin are located in the Early Miocene to Middle Miocene section. These reservoirs …

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Influences Of Geologic Conditions And Anthropogenic Activities On Changes Of Geomorphology And Sediment Load Characteristics Of The Ping And Chao Phraya Rivers, Nikhom Chaiwongsaen Jan 2018

Influences Of Geologic Conditions And Anthropogenic Activities On Changes Of Geomorphology And Sediment Load Characteristics Of The Ping And Chao Phraya Rivers, Nikhom Chaiwongsaen

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Chao Phraya River flows into the largest river basin of Thailand. The Ping River is one of its the major upstream branches flowing down slope southwardly, joining the Chao Phraya River in the central plain and ends at the Gulf of Thailand. The sand-choked is extensively observed and the flood overflow occurs frequently and rapidly at the Lower Ping River. In contrary, the Chao Phraya River, the erosion of river bank and shoreline around the river mouth has been spatially increasing in place. The Landsat imageries taken in 1987, 1997, 2007 and 2017 were used to analyze geomorphological changes …

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Aftershock Analysis In The Mainland Southeast Asia, Premwadee Traitangwong Jan 2018

Aftershock Analysis In The Mainland Southeast Asia, Premwadee Traitangwong

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study, the characteristics of the aftershock in the mainland Southeast Asia (MSEA) were investigated using the several seismological techniques, i.e., i) the Gutenberg-Richter relationship (G-R relationship) ii) the modified Omori's law iii) the Bath's law and iv) the fractal dimension. After declustering, 1,697 clusters during 1985-2017, which represent the aftershocks occurring after mainshock were investigated in 13 seismic source zones recognized in the MSEA. According to the Bath's law, the maximum magnitude of the aftershock depends on the magnitude of the mainshock, with the difference value between 0.4-2.5. In the intraplate zone, it is less than in the …

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Effects Of Monovalent Ions On Low Salinity Waterflooding In Shaly-Sandstone Reservoir, Ativish Yomchan Jan 2018

Effects Of Monovalent Ions On Low Salinity Waterflooding In Shaly-Sandstone Reservoir, Ativish Yomchan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Multi-component Ion Exchange (MIE) was proved to be a major mechanism occurred during Low Salinity Waterflooding (LSWF). Reduction of both total salinity and concentration of divalent ions of injected water together with a presence of monovalent ion results in dissolution of divalent ions linking between rock surface and oil. As a consequence, oil is liberated from rock surface. This study aims to study effects of monovalent ions in MIE mechanism. Stirring test is performed and results show that ion with less hydration radius tends to be more active in MIE; hence, potassium ion and cesium ion illustrate potential in oil …

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Evaluation Of Wax Deposition Prevention For Crude Oil Production From Mae Soon Oil Field, Htet Myat Min Jan 2018

Evaluation Of Wax Deposition Prevention For Crude Oil Production From Mae Soon Oil Field, Htet Myat Min

Chulalongkorn University Theses and Dissertations (Chula ETD)

Waxy crude oils are normally found in petroleum reservoirs. Crude oil with the wax formation is one of the crucial problems for flow assurance of pipeline transportation in oil and gas production. This issue can commonly cause wax deposition problem and it has made a huge amount of economic losses such as production, time and maintenance cost. Therefore, it is a critical aspect to deal with wax deposition for crude oil flow assurance, especially at the surface region in cold climate. In this study, n-heptane and poly (maleic anhydride-alt-1-octadecane) or MA as the inhibitors with different concentrations will be measured …

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