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2020

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Picking-And-Placing Food With Vacuum Pad And Soft Gripper For Industrial Robot Arm, Wiwat Tulapornpipat Jan 2020

Picking-And-Placing Food With Vacuum Pad And Soft Gripper For Industrial Robot Arm, Wiwat Tulapornpipat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Human with different conditions such as disease, allergy, gender, ethnicity, or religion need different types of food. Nowadays, people prefer to choose diet based on nutrition value over price such as composition of food or the impact on body, so personalized or customized food could potentially be a big market in few years. With this aspect, the assembly robot becomes a good choice in the food industry to produce the small amount of packed meal with highly adjustable ingredients to match with the requirements. With the automation system, the cooking process is faster, cheaper and safer, yet coming with good …

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Demand Forecasting For A Food Condiment Manufacturer In Thailand, Woratanon Sirimak Jan 2020

Demand Forecasting For A Food Condiment Manufacturer In Thailand, Woratanon Sirimak

Chulalongkorn University Theses and Dissertations (Chula ETD)

The food industry is one of the most important industries in Thailand. The case study company is a condiment manufacturer that needs to manage and plan for their business efficiently. One of the most important issues is demand forecasting. The company should precisely forecast their product demands, which will be used for operation planning. This study proposes forecasting models for both short-term and long-term planning for three main condiment products. The data used are monthly condiment product demands from January 2013 to December 2020. The forecasting methods explored in the study are time series, machine learning, combined forecasting, and hybrid …

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Mitigation Of Tsunami Debris Impact By Fender Structures For Reinforced-Concrete Buildings, Zin Zin Tun Jan 2020

Mitigation Of Tsunami Debris Impact By Fender Structures For Reinforced-Concrete Buildings, Zin Zin Tun

Chulalongkorn University Theses and Dissertations (Chula ETD)

The impact of large debris such as loaded shipping containers can cause significant damage to buildings at shorelines. In this study, the building and protection structures are connected with fenders to reduce the impact of large debris. The objective is to study the building with a fender structure that reduces the impact of the shipping container. For a fender structure, cone-shaped rubber fenders are used to absorb the impact energy. Various fender reactions are considered as a parameter to conduct the efficiency of the fender. Tsunami pushover analyses using the force-controlled and displacement-controlled methods are used to obtain the capacity …

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Development Of Out-Of-Class Extensive Reading To Enhance Perceived English Reading Self-Efficacy Of Underserved Students, Chanisara Tangkijmongkol Jan 2020

Development Of Out-Of-Class Extensive Reading To Enhance Perceived English Reading Self-Efficacy Of Underserved Students, Chanisara Tangkijmongkol

Chulalongkorn University Theses and Dissertations (Chula ETD)

Perceived English reading self-efficacy is one of the essential factors that facilitate development of English language ability as it motivates learners to read and learn. The present study aimed to investigate the outcomes of out-of-class extensive reading to enhance perceived reading self-efficacy of underserved student and to explore underserved students' attitudes towards out-of-class extensive reading. In this study, a mixed-method research design, with a particular focus on the use of narrative inquiry, was employed, and the study participants consisted of five lower secondary students in a slum community in Bangkok, Thailand. The purposively selected participants were between 14 and 15 …

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Genome Annotation Pipelines For Prokaryotic And Eukaryotic Microorganisms Using De Novo Short Read Genome Assembly, Songtham Anuntakarun Jan 2020

Genome Annotation Pipelines For Prokaryotic And Eukaryotic Microorganisms Using De Novo Short Read Genome Assembly, Songtham Anuntakarun

Chulalongkorn University Theses and Dissertations (Chula ETD)

Next-generation sequencing (NGS) is the massively parallel sequencing technology that has revolutionized biological sciences. Currently, microorganism genomes have been widely studied using NGS. However, the lack of details in the draft or reference genome is a common problem in genome analysis. Therefore, this study aims to develop genome analysis pipelines for eukaryotic and prokaryotic microorganisms using public bioinformatics software and public databases. Leishmania matiniquensis and Leptospira interrogans were used as models for genome assembly and annotation in eukaryote and prokaryote, respectively. Our pipelines used SPAdes for short read assembled, AUGUSTUS and Prokka for gene prediction in eukaryotic and prokaryotic microorganisms, …

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Artificial Intelligence And Copyright Law In Singapore A Study On The Protection Of Compilations And Databases Arranged By Ai-Systems, Sella Say Jan 2020

Artificial Intelligence And Copyright Law In Singapore A Study On The Protection Of Compilations And Databases Arranged By Ai-Systems, Sella Say

Chulalongkorn University Theses and Dissertations (Chula ETD)

While the capability of artificial intelligence ("AI") gains remarkable momentum in creating copyrightable materials – the questions regarding the eligibility of these new creations, at the moment, are broadly discussed and posed challenges to the regime. The problem of how we fit the conventional notion of authorship and the condition of originality for AI-generated works remains a controversial topic. Some might suggest that subject matter created by AI should not be granted copyright protection on the presumption that AI is not a human who could treat as authors of works. At the same time, other supportive claims that the first …

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Variation Of Tuberculosis Prevalence Across Diagnostic Approaches And Geographical Areas Of Indonesia, Alvera Noviyani Jan 2020

Variation Of Tuberculosis Prevalence Across Diagnostic Approaches And Geographical Areas Of Indonesia, Alvera Noviyani

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Tuberculosis (TB) has contributed a significant disease burden and economic loss worldwide. Given no gold standard for diagnosis, early identification of TB infection has been challenging. This study aimed to comparatively investigate the prevalence of TB across diagnostic approaches (sputum AFB, sputum culture, sputum genetic test, and chest x-ray) and geographical areas in Indonesia. Methods: Participant demographic variables and TB screening test results were obtained from the Tuberculosis Unit, Health Research and Development Agency, Ministry of Health (HRDA-MoH). Variations across geographical areas and diagnostic approaches are expressed as prevalence rate and 95%CI. Results: A total of 67,944 records were …

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Enhancing The Level Of Consumer Protection In China: A Reform Proposal For The Odr System, Xiao Gu Jan 2020

Enhancing The Level Of Consumer Protection In China: A Reform Proposal For The Odr System, Xiao Gu

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis examines the limits of current dispute resolutions to resolve disputes between consumers and online platform economics entities to make recommendations to optimize the ODR system to resolve these disputes. Therefore, there is a hypothesis of this thesis that by reference to the legislation and experience abroad, the author should make a proposal on the reformation of the current ODR system based on the context and tradition of the ODR system in China to enhance the level of consumer protection. In the thesis, the author performed analyses and made suggestions as follows: (1) to clarify some basic concepts related …

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Sonographic Ductal Changes And Pertinent Characteristics That Associate With Proliferative Lesions Of Breast, Anggraeni Ayu Rengganis Jan 2020

Sonographic Ductal Changes And Pertinent Characteristics That Associate With Proliferative Lesions Of Breast, Anggraeni Ayu Rengganis

Chulalongkorn University Theses and Dissertations (Chula ETD)

Managing for sonographic focally thick duct lesions is not established in practice guidelines. Most cases showed scant cells on fine-needle aspiration (FNA). The study aimed to detect any variables that could predict proliferative lesions of the ducts and avoid unnecessary biopsies. A retrospective cohort design was done to analyze the association between ultrasound (US) variables and the outcome of proliferative or non-proliferative ductal lesions, determined by corresponding histopathology or cytology on consecutive follow-ups for at least three years. The data collection from 2015-2017 at King Chulalongkorn Memorial Hospital showed that 199 female patients with 210 index lesions met the eligibility …

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The Labeling Of 99mtc-Psma-Hbed-Cc For Prostate Cancer Imaging, Benchamat Phromphao Jan 2020

The Labeling Of 99mtc-Psma-Hbed-Cc For Prostate Cancer Imaging, Benchamat Phromphao

Chulalongkorn University Theses and Dissertations (Chula ETD)

Prostate cancer (PCa) is the second most common cancer and the fifth leading cause of death worldwide in 2018 (1). Initially, PCa diagnosis is based on Prostate Specific Antigen (PSA) blood test, which is low sensitivity and low specificity, and sonography guided needle biopsy, which is invasive. Therefore, molecular imaging recently enrolls as an important technique in PCa diagnosis using some small molecules which are well developed to bind to overexpressed Prostate Specific Membrane Antigen (PSMA). The small molecules, for example PSMA-HBED-CC, PSMA I&T, can be chelated with Ga-68 for diagnostic purpose using positron emission tomography (PET) scan. Even though …

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The Effect Of The Program Promoting Infection Prevention Behaviors In Family Caregivers Of Pre-School Age Children With Acute Lymphoblastic Leukemia: The Application Of Self-Care Deficit Nursing Theory, Su-Ari Lamtrakul Jan 2020

The Effect Of The Program Promoting Infection Prevention Behaviors In Family Caregivers Of Pre-School Age Children With Acute Lymphoblastic Leukemia: The Application Of Self-Care Deficit Nursing Theory, Su-Ari Lamtrakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

This quasi-experimental, pretest-posttest design aimed to compare infection prevention behaviors (medication administration, infection control, and infection surveillance) between the family caregivers of preschool-age children with acute lymphoblastic leukemia (ALL) in the experimental group and the control group. This nursing program is based on the Self-Care Deficit theory, to enable dependent care agencies regarding infection prevention behaviors of family caregivers. The dependent care agency consisted of the ability to acquired knowledge, ability to make a decision, and ability to perform infection prevention behaviors. The sample was 45 family caregivers of preschool age children with ALL, 23 were an experimental group and …

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Intention To Stay Among Nurses In Ministry Of Public Health, Thailand: A Cross-Sectional Survey, Rata Srisa-Art Jan 2020

Intention To Stay Among Nurses In Ministry Of Public Health, Thailand: A Cross-Sectional Survey, Rata Srisa-Art

Chulalongkorn University Theses and Dissertations (Chula ETD)

A cross-sectional survey designed to investigate intention to stay (ITS) of nurses (RNs) in public hospitals under the Ministry of Public Health (MOPH) and to compare the intention to stay among nurses in various hospital types of care delivery of organizational characteristics, nurse characteristics, managerial characteristics, and work characteristics. The multi-stage sampling technique was used to recruit 1,524 nurses from in-patient units of 59 public hospitals under MOPH. Four instruments were used, namely: Nurse Characteristics and Socio-Demographic Data Form; Management Factors Questionnaire; Job Diagnostic Survey; and Intention to Stay Scales. All instruments were examined for content validity and reliability. The …

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Improve Customer Experience By Introducing Coach Knowledge Assessment (Cka) Preparation Class: Case Study Thailand Coaching Institute, Thipsupang Sanjariyapipu Jan 2020

Improve Customer Experience By Introducing Coach Knowledge Assessment (Cka) Preparation Class: Case Study Thailand Coaching Institute, Thipsupang Sanjariyapipu

Chulalongkorn University Theses and Dissertations (Chula ETD)

From problem identification process in participants' perspective, the study found two major pain points: poor exam time management based on skill and speed; and concern of language, in coach knowledge assessment (CKA) experience. Therefore, the focus of this study would be improving ICF coach mentoring program for ACC to improve experience of participants who will take coach knowledge assessment (CKA). The key objective of this research is to improve customer experience by introducing coach knowledge assessment (CKA) preparation class: case study Thailand coaching institute. From the problem identification process, the proposed solution from literature review and expert's suggestion is coach …

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A Topical Eye Drop Versus Intra-Meibomian Gland Injection Of Bevacizumab For Meibomian Gland Dysfunction Patients., Chitchanok Tantipat Jan 2020

A Topical Eye Drop Versus Intra-Meibomian Gland Injection Of Bevacizumab For Meibomian Gland Dysfunction Patients., Chitchanok Tantipat

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: To compare the efficacy and safety of topical bevacizumab eye drop versus intra-meibomian gland injection of bevacizumab when used with the standard lid hygiene in meibomian gland dysfunction (MGD) patients. Methods: 60 eyes of 30 MGD patients with lid margin telangiectasia were randomized to receive 0.05% bevacizumab eye drop or single 2.5% intra-meibomian gland bevacizumab injection plus standard lid hygiene. The primary outcomes were telangiectasia grading and the computerized lid margin neovascularized area (LMNA). The secondary outcomes were the ocular surface disease index (OSDI) score, corneal staining, meibomian gland quality, meiboscore, conjunctival redness, fluorescein break up time (FBUT), noninvasive …

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Vaginal Atrophy Treatment Using Microablative Fractional Carbon Dioxide Laser: A Randomized Patient And Evaluator-Blinded Sham-Controlled Trial, Purim Ruanphoo Jan 2020

Vaginal Atrophy Treatment Using Microablative Fractional Carbon Dioxide Laser: A Randomized Patient And Evaluator-Blinded Sham-Controlled Trial, Purim Ruanphoo

Chulalongkorn University Theses and Dissertations (Chula ETD)

Introduction: In recent years, microablative fractional carbon dioxide (CO2) laser becomes popular in treatment of vaginal symptoms including vaginal atrophy. This study aimed to evaluate efficacy of vaginal CO2 laser in treatment of vaginal atrophy, compared to the sham procedure. Methods: Between June 2016 and May 2017, postmenopausal women with moderate to severe intensity of any symptoms of vaginal atrophy were invited to the study. A total of 88 women were randomized for treatment with vaginal CO2 laser or sham procedure every 4 weeks for 3 sessions. The participants were blinded to the intervention they received. The operator was also …

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Factors Related To Health-Related Quality Of Life In Patients With Acute Coronary Syndrome In West Java, Indonesia, Haerul Imam Jan 2020

Factors Related To Health-Related Quality Of Life In Patients With Acute Coronary Syndrome In West Java, Indonesia, Haerul Imam

Chulalongkorn University Theses and Dissertations (Chula ETD)

This descriptive study aimed to examine the relationship between age, self-efficacy, functional status, pain, dyspnea, social support, and health-related quality of life in patients with acute coronary syndrome in west java, Indonesia. The participants were 186 patients who has acute coronary syndrome or history of acute coronary syndrome visited cardiovascular outpatient clinic in the main national public hospital type A in west java province, Indonesia. The instruments used for data collection were Demographic Questionnaire, General Self-efficacy Scale, Seattle Angina Questionnaire, Rose Questionnaire for Angina, Rose Dyspnea Questionnaire, ENRICH Social Support, and MacNew Health Related Quality of life. These instruments were …

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A Causal Model Of Functional Status Among Persons With Liver Cirrhosis, Surachai Maninet Jan 2020

A Causal Model Of Functional Status Among Persons With Liver Cirrhosis, Surachai Maninet

Chulalongkorn University Theses and Dissertations (Chula ETD)

This cross-sectional correlation study aimed to develop and test a causal relationship among alcohol consumption, illness perception, social support, fatigue, and functional status among persons with liver cirrhosis. The hypothesized model was constructed based on the theory of unpleasant symptoms and the review of the literature. A stratified three-stage random sampling approach was utilized to recruit 400 persons with liver cirrhosis aged 40 years old and older who visited four hospitals from three regions of Thailand. Research instruments consisted of the demographic data form, Alcohol Use Disorders Identification Test Consumption, Brief Illness Perception Questionnaire, Multidimensional Scale of Perceived Social Support, …

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Quaternion Algebras Over Some Extensions Of Function Fields, Silipong Thongmeepun Jan 2020

Quaternion Algebras Over Some Extensions Of Function Fields, Silipong Thongmeepun

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this thesis, we study quaternion algebras over rational function fields over finite fields of odd order. [It is known that a quaternion algebra is either the algebra of 2x2- matrices or a division algebra.] We determine conditions for quaternion algebras of the form(symbol) to be division algebras and conditions for quaternion algebras to split after the constant quadratic field extension.

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The Study Of Women Leaders In Southeast Asia, Jin Meichen Jan 2020

The Study Of Women Leaders In Southeast Asia, Jin Meichen

Chulalongkorn University Theses and Dissertations (Chula ETD)

In a patriarchal society, the subjection of women to men is a universal custom, so any departure from it appears unnatural. However, since the very early time in Southeast Asia, females enjoyed a relatively high status and independence. They also took important roles no matter in the family or the society. As a result, there were many outstanding women leaders and elite women throughout history. However, the concept of patriarchy still affects Southeast Asia society. It is more common for a man to hold the position of leader in society. This article studied female leaders of Southeast Asia during the …

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"Elite Schools" And French Politics (1945-2021), Manita Lohasuwan Jan 2020

"Elite Schools" And French Politics (1945-2021), Manita Lohasuwan

Chulalongkorn University Theses and Dissertations (Chula ETD)

The core values of the French society comprise of liberty, democracy and equality. However, there seems to be limitation and social inequality when it comes to be "elite training schools". These privileged training and selection systems of French civil service seem to be a unique French practice. The elite training schools, especially L'Ecoles Nationale d' Administration, represents inequality in French society and, therefore, presents a problem for French politics. This study analyzes (1) the relationship between French elite training schools and French state; and (2) the important of the ENA for French politics. The result of this research shows an …

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A Comparative Study Of Financial Literacy Between The Eu And Thailand. What Can Thailand Learn From The Eu?, Nutchapat Siripattananuntakul Jan 2020

A Comparative Study Of Financial Literacy Between The Eu And Thailand. What Can Thailand Learn From The Eu?, Nutchapat Siripattananuntakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Financial literacy is a key factor in promoting economic stability. In a situation where the world is changing rapidly, financial literacy is essential in various contexts. Nowadays, many Thai retired individuals face an increase in debt burden, and they do not have enough money for living after retirement. As the researcher is a Thai nationality, the researcher aspires to contribute to Thailand's financial literacy. Pursuing Master of Arts in European Studies have led the researcher to develop an interest in comparing the financial skills of Thais and Europeans. The objective of this study is to compare the financial literacy between …

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Films As French Soft Power: The Case Of Thailand, Soisuda Niwon Jan 2020

Films As French Soft Power: The Case Of Thailand, Soisuda Niwon

Chulalongkorn University Theses and Dissertations (Chula ETD)

The film is not simply the most profitable cultural industry, but it is also considered the most powerful tool of "soft power. As "soft power," film is used by the state to promote its culture, civilization, and positiveness of the country as well as forms the positive perception to the public. In the case of France, the Ministry of Europe and Foreign Affairs has appointed Alliance Francaise and French Institute as cultural representative to promote the French language, culture, and civilization to the public in oversea. As a result, people have a positive image of France and maintain a soild …

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The End Of Homelessness Through Policies And Implementations : Case Studies Of Finland And Ireland, Rapee Tapta Jan 2020

The End Of Homelessness Through Policies And Implementations : Case Studies Of Finland And Ireland, Rapee Tapta

Chulalongkorn University Theses and Dissertations (Chula ETD)

The objectives of this research are 1) To study the homelessness situation in Finland and Ireland 2) To describe what methods Finland and Ireland take into action to reduce homelessness 3) To compare the performance of Finland and Ireland, by collecting data from the documents, government's reports, annual reports, and related research—focusing on public policies, strategies and implementations of both Finland and Ireland from 2018 to 2021, by using thematic analysis method to analyze the date. The results of the research can divide into three topics. First, the number of homelessness in Finland and Ireland reduced satisfactorily, especially in Ireland …

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Conversion Of N-Pentane To Light Olefins Over Modified Zr/Hzsm-5-Based Catalysts, Bharanabha Makkaroon Jan 2020

Conversion Of N-Pentane To Light Olefins Over Modified Zr/Hzsm-5-Based Catalysts, Bharanabha Makkaroon

Chulalongkorn University Theses and Dissertations (Chula ETD)

Ethylene and propylene are important raw materials for producing several types of chemicals and polymers. According to the increase of propylene demand in recent year, the P/E ratio was increased to 0.85. In order to meet the propylene demand, the development of hybrid HZSM-5 catalyst for catalytic cracking becomes more interesting owing to the cracking activity from HZSM-5 zeolite acid site and loaded metal on HZSM-5 that expected to promote the dehydrogenation activity to the catalyst which could possibly enhanced the P/E ratio. The alternative feedstock for this process is n-pentane which is the low-value product from distillation process. The …

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From Aiding To Equal Partnership Between The Eu And African Countries: The Case Of Ethiopia's Tigray Conflict, Yue Zhao Jan 2020

From Aiding To Equal Partnership Between The Eu And African Countries: The Case Of Ethiopia's Tigray Conflict, Yue Zhao

Chulalongkorn University Theses and Dissertations (Chula ETD)

This article mainly introduces the current situation of the Tigray conflict in Ethiopia and the EU's assistance to Ethiopia as well as the dialectical thinking on the EU's approach. In the first part, the author gives a brief history of Ethiopia to explain the relationship between the Tigray People's Liberation Front(TPLF)and the federal government. In this part, the article also narrates the general situation of Tigray War. At the same time, in order to further explain the reasons for the outbreak of the conflict in Tigray, the second part introduces the economic and ethnic issues behind the outbreak of the …

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Perceptions Of Joe Biden In Europe Since The 2020 Us Presidential Election, Pimchanok Kutchon Jan 2020

Perceptions Of Joe Biden In Europe Since The 2020 Us Presidential Election, Pimchanok Kutchon

Chulalongkorn University Theses and Dissertations (Chula ETD)

The European Union has been a significant partnership of the US for long time but Donald Trump's foreign policy in Europe has crucially impacted the territory and greatly changed perception of America in Europe countries. Therefore, it is a duty for the new US president to revitalize Washington's image. After Biden took then office, many European countries tend to be grateful for Biden's victory; however, each country (France, Belgium, and Germany) expresses delight on different stories about Biden. At first, France appeared to lose faith in the competence of US president but it changed its mind when Biden returned the …

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Communist "Normal" Life: The Criticism Of Daily Life Under A Totalitarian Regime, Rawee Archewa Jan 2020

Communist "Normal" Life: The Criticism Of Daily Life Under A Totalitarian Regime, Rawee Archewa

Chulalongkorn University Theses and Dissertations (Chula ETD)

The communist regime in Eastern Europe came after the end of Second World War by promoting the equality of people. The difference between West and East with two regimes obviously classified the living of people; the Western bloc emphasized on rights and freedom fostering the expansion of consumerist ideology. Consequently, the economic in the West developed, followed by the prosperity and well-being of people. In contrast to the Eastern bloc, it was controlled by the state and the evidences showed that the communist leaders could not serve the people's wants and needs. While the communist state created their enormous and …

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Influence Of Mixed Anionic-Nonionic Surfactants On Methane Hydrate Formation : Suppression Of Foam Formation, Chakorn Viriyakul Jan 2020

Influence Of Mixed Anionic-Nonionic Surfactants On Methane Hydrate Formation : Suppression Of Foam Formation, Chakorn Viriyakul

Chulalongkorn University Theses and Dissertations (Chula ETD)

Solidified natural gas (SNG) via clathrate hydrate is a new technology for natural gas storage with high energy content per unit volume, extremely safe, and ease to recover. Although SNG has several advantages, its limitation is low rate of hydrate formation. Sodium dodecyl sulfate (SDS) is well known as a kinetic promoter used to increase the hydrate formation rate. However, using SDS resulted in a large amount of foam during gas recovery. In order to alleviate this problem, mixtures of SDS with nonionic surfactants were investigated. Polyoxyethylene (n) lauryl ether (EO₃ and EO₅) and alkyl poly glycol (APG) were mixed …

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Layer-By-Layer Surface Modification Of Polymer Filament For Catalytic 3d Printed Parts, Pornnutcha Thadasri Jan 2020

Layer-By-Layer Surface Modification Of Polymer Filament For Catalytic 3d Printed Parts, Pornnutcha Thadasri

Chulalongkorn University Theses and Dissertations (Chula ETD)

Catalyst was constructed in form of microreactor by fused deposition modeling (FDM) or 3D printing method that allow micro scale customization in order to achieve high detail construction. Poly (lactic acid) (PLA) and Poly (acrylonitrile-butadiene-styrene) (ABS) filaments were used as a built-up material. The surface modification was introduced to improve filaments surface adhesion by using alkaline treatment and Polyethyleneimine with variation of time and concentration and then deposited with polyelectrolyte multilayers by layer-bylayer technique before catalyst loading. Catalyst were synthesized by reduction reaction of Silver nitrate (AgNO₃) and sodium borohydride (NaBH4) with using poly (4-styrenesulfonic acid-co-maleic acid) as a capping …

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Pyrrolidine As A Promoter For Methane Hydrate Formation: Comparative Study On The Thermodynamics, Kinetics, And Morphology With Tetrahydrofuran, Siravich Junthong Jan 2020

Pyrrolidine As A Promoter For Methane Hydrate Formation: Comparative Study On The Thermodynamics, Kinetics, And Morphology With Tetrahydrofuran, Siravich Junthong

Chulalongkorn University Theses and Dissertations (Chula ETD)

Solidified natural gas (SNG) via clathrate hydrates has been proposed as an alternative approach for natural gas storage and transportation due to its numerous advantages. However, a slow hydrate formation rate and a requirement of operating conditions are the major limitations, which need to be improved to make SNG competitive in a large scale deployment. In this work, the roles of 5.56 mol% pyrrolidine were investigated for the methane hydrate formation in terms of thermodynamics and kinetics along with morphology. The results showed that pyrrolidine generally improved the thermodynamic stability of mixed methane hydrates, enhancing the formation at milder conditions …

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