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Articles 1891 - 1920 of 6471
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Association Between Cotinine Levels And The Semen Quality Among Male Tobacco Farmers In Sukhothai Province, Thailand, Anu Surach
Chulalongkorn University Theses and Dissertations (Chula ETD)
Thai traditional tobacco is one of the greatest public health problems. Tobacco leaves contains nicotine that may impacts on the quality of life of tobacco farmers. The study aimed to explore the association of work-related factors on salivary cotinine levels and semen quality among male tobacco farmers in Sukhothai Province, Thailand. This was a longitudinal study of 62 participants aged 20-40 years without reproductive disease, chronic disease, obesity, and psychiatric disease in Sukhothai Province, Thailand. Data were collected three times during processing of cultivation tobacco growing in March to May 2022. A self-administered questionnaire was used to collect on individual …
Hydrogen Production By Steam Reforming Of Bioethanol And Fusel Oil Over Ni/Zsm-5 Nanosheet And Ni/Sic, Porapak Suriya
Hydrogen Production By Steam Reforming Of Bioethanol And Fusel Oil Over Ni/Zsm-5 Nanosheet And Ni/Sic, Porapak Suriya
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research, hydrogen production is performed by steam reforming of bio-alcohol over Ni-based catalysts. First section of the study, Ni/SiC catalyst was synthesized and used in steam reforming of fusel oil (FSR). The SiC support was prepared by pyrolysis of rice husk at 1500 °C to obtain β-SiC phase, which benefit to reduce the carbon formation due to its good thermal conductivity and durability. The Ni/SiC1500 indicated 90% of fusel oil gas conversion and 29% of hydrogen yield during a 300 min of steam reforming of fusel oil at 700 °C, hence presenting a good performance, and remaining stable …
Stimuli-Responsive Chitosan-Based Hydrogels For Antibiotic Delivery, Tu Tran Vo Minh
Stimuli-Responsive Chitosan-Based Hydrogels For Antibiotic Delivery, Tu Tran Vo Minh
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aims to investigate hydrogels fabricated via green approaches for drug delivery application. Biocompatible polymer-based drug delivery systems (DDS) have gained popularity in recent years because of their ability to improve the efficacy and safety of drug delivery by providing targeted and sustained release of drugs to reduce the frequency of dosing, making it more convenient for patients. Chitosan is one of the polymers commonly used for this purpose due to their higher water retention and porosity, which create space for loading medicine into the matrix. However, the potential utilization of endogenous and exogenous stimuli controlling drug release still …
Synthesis Of Functionalized Porphyrins For Application As Soft Materials, Dumrongsak Aryuwananon
Synthesis Of Functionalized Porphyrins For Application As Soft Materials, Dumrongsak Aryuwananon
Chulalongkorn University Theses and Dissertations (Chula ETD)
The series of functionalized porphyrins was designed and synthesized by varying para-substituents on meso-position of porphyrin ring as ether, ester, and urea with three different long alkyl chains (3-5, 7-9, 11). Afterwards, metalation of porphyrin derivatives by some 3d metals to serve as soft materials, liquid crystal, and axial ligands were introduced to provide spin-crossover property. Each series of functionalized porphyrin derivatives with three different chain lengths (3-5, 7-9, 11) and their Co(II) (3-5a,7-9a), Ni(II) (3-5b,7-9b), and Fe (III) (3-5c,7-9c) complexes were characterized by spectroscopic techniques consisting of NMR, IR, UV-visible and MS. The desired compounds were studied their mesomorphic …
Superhydrophobic Polydimethylsiloxane For Fabrication Of Digital Magnetofluidics, Pakakan Ngernpradab
Superhydrophobic Polydimethylsiloxane For Fabrication Of Digital Magnetofluidics, Pakakan Ngernpradab
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this work, polydimethylsiloxane (PDMS), a well-known material for microfluidic devices, was used to fabricate a digital magnetofluidic device. The use of PDMS material allows for easy fabrication and flexibility. The superhydrophobic property of PDMS surface was easily achieved using a one-pot method by reduction between chloroauric acid and sodium formate. The superhydrophobic property of PDMS surface was investigated using water contact angle (WCA) and contact angle hysteresis, which were found to be 163.9° and 0°, respectively, indicating the superhydrophobic surface. The morphology of gold coated PDMS surface was characterized using a scanning electron microscope (SEM), an X-ray diffractometer (XRD), …
The Influence Of Extracellular Matrix On Human Periodontal Ligament Stem Cell Properties, Daneeya Na Nan
The Influence Of Extracellular Matrix On Human Periodontal Ligament Stem Cell Properties, Daneeya Na Nan
Chulalongkorn University Theses and Dissertations (Chula ETD)
The periodontal ligament (PDL) is a crucial tissue connecting teeth to surrounding alveolar bone, withstanding the mechanical forces of mastication, speech, and deglutition. The extracellular matrix (ECM) of the PDL plays a critical role in maintaining PDL cell stability and function in response to external forces. Mechanotransduction, the process by which cells convert mechanical signals into biochemical signals, is essential for PDL cells to sense and respond to mechanical stimuli. The ECM is a critical mediator of mechanotransduction, as it is responsible for transmitting mechanical forces to cells and regulating cellular responses to mechanical stress. Matricellular proteins, such as periostin …
Strengthening Of Reinforced Concrete Members With Lap Splices Using Steel Collars, Aji Ejaz
Strengthening Of Reinforced Concrete Members With Lap Splices Using Steel Collars, Aji Ejaz
Chulalongkorn University Theses and Dissertations (Chula ETD)
Bond splitting failure of substandard lap splices have caused extensive damage to many structures during earthquakes. Existing methods to strengthen substandard lap splices primarily involve wrapping the substandard lap spliced regions with jackets possessing mainly in-plane stiffness. Hence, the efficiency of such techniques is compromised due to the lateral bulging of concrete and flexural bending of jackets. This study investigated hollow steel section (HSS) collars which offer axial and flexural stiffness in mitigating splitting failures associated with lap splices not conforming to current design codes. Three lap splice lengths, mainly 20, 28, and 35 times the bar diameter (db) were …
Computational Modeling Of Benzyl Alcohol Oxidation Coupled With Hydrogen Production In A Photoelectrochemical Reactor, Thorfhan Hanamorn
Computational Modeling Of Benzyl Alcohol Oxidation Coupled With Hydrogen Production In A Photoelectrochemical Reactor, Thorfhan Hanamorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
In photoelectrochemical (PEC) cells, hydrogen production at the cathode must be coupled with the oxidation reaction at the anode. Selective oxidation of benzyl alcohol into benzaldehyde is an attractive alternative pathway due to its lower overpotential than the traditional oxygen evolution reaction (OER). In this work, simulation of selective oxidation of benzyl alcohol into benzaldehyde paired with hydrogen production in 2 chambers of 2-dimensional PEC reactor was studied using COMSOL Multiphysics (5.6). Charge transport and electrochemical kinetics were simulated using Nernst Planck’s and Butler Volmer's equations, respectively. The results have showed that hydrogen and benzaldehyde concentrations on electrode surfaces increased …
Kinetic Mechanism Of Indigo-Producing Indole Monooxygenase From Acinetobacter Baumannii, Kanyarat Suksomjaisaman
Kinetic Mechanism Of Indigo-Producing Indole Monooxygenase From Acinetobacter Baumannii, Kanyarat Suksomjaisaman
Chulalongkorn University Theses and Dissertations (Chula ETD)
Indole, a bicyclic compound comprising a fused benzene and pyrrole ring, serves as a fundamental component in numerous natural compounds. Additionally, indole holds significant importance in industrial applications, particularly in the production of pharmaceutical drugs and agrochemicals. Flavin-dependent indole monooxygenase is an enzyme responsible for hydroxylation of the indole ring. Indole monooxygenase is a two-components: flavoprotein reductase containing FAD as a cofactor, and monooxygenase. The reductase component utilizes NADH to catalyze flavin reduction and transfers the reduced flavin to the monooxygenase component. The hydroxylation of indole by monooxygenase reduced FAD and oxygen as substrates. In this study, we cloned the …
Problems Of The Use Of Registered Trademark In The Case Of Fair Use, Nantarat Munsrijan
Problems Of The Use Of Registered Trademark In The Case Of Fair Use, Nantarat Munsrijan
Chulalongkorn University Theses and Dissertations (Chula ETD)
According to Section 44 of the Trademark Act B.E. 2534, once the trademark has been registered, the trademark owner will have the exclusive right to authorize or prohibit others from using the mark. For this reason, if a person uses a trademark that is same to or similar to that registered trademark on registered goods of that class without permission from the registered trademark owner under the law and causes damage to the trademark owner who is the registrant, it would be considered an infringement of the right to use the trademark under this Section 44. However, in Thailand determines …
การแสดงเดี่ยวเปียโนโดย อิษฎ์นันทน์ โชติรสนิรมิต : บทเพลงเดี่ยวและคอนแชร์โตจากสามยุคดนตรี, อิษฎ์นันทน์ โชติรสนิรมิต
การแสดงเดี่ยวเปียโนโดย อิษฎ์นันทน์ โชติรสนิรมิต : บทเพลงเดี่ยวและคอนแชร์โตจากสามยุคดนตรี, อิษฎ์นันทน์ โชติรสนิรมิต
Chulalongkorn University Theses and Dissertations (Chula ETD)
การวิจัยนี้มีจุดประสงค์เพื่อศึกษาหาความรู้ วิเคราะห์ ตีความบทเพลง และเลือกใช้เทคนิคที่เหมาะสมในการบรรเลงบทเพลงสำหรับเปียโนจำนวนทั้งสิ้น 5 บท ได้แก่ Toccata in C minor, BWV 911 ผลงานของโยฮันน์ เซบาสเตียน บาค Two Nocturnes, Op.62 ผลงานของเฟรเดริค โชแปง Andante Spianato et Grande Polonaise Brillante, Op.22 ผลงานของเฟรเดริค โชแปง และ Piano Concerto No.3 in C minor, Op.37 ผลงานของลุดวิก ฟาน เบโทเฟน การแสดงซึ่งประกอบด้วยเพลงเดี่ยวและคอนแชร์โตเป็นการแสดงที่ต้องอาศัยเทคนิคการบรรเลงขั้นสูง การตีความที่ลึกซึ้ง และกระบวนการฝึกซ้อมอย่างเป็นระบบ โดยเฉพาะการแสดงร่วมกับกลุ่มนักดนตรี ผลการวิจัยแสดงผลการตีความบทเพลง การนำเสนอเทคนิคการบรรเลงและวิธีการฝึกซ้อมเพื่อการบรรเลงบทเพลงตามแนวปฏิบัติที่ถูกต้อง รวมทั้งขั้นตอนการเตรียมความพร้อมสำหรับการแสดงเดี่ยวเปียโนที่จัดขึ้นเมื่อวันที่ 15 ธันวาคม พ.ศ.2565 ณ Tongsuang's Concert Salon & Gallery จังหวัดปทุมธานี ใช้เวลาในการแสดงทั้งหมดประมาณ 1 ชั่วโมง 20 นาที
Financial Feasibility Study Of Incremental Modified Drugs Development By Domestic Pharmaceutical Industry, Manthana Laichapis
Financial Feasibility Study Of Incremental Modified Drugs Development By Domestic Pharmaceutical Industry, Manthana Laichapis
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Thai pharmaceutical industry aims to achieve self-reliance in vaccines, drugs, and biologics as per the National Strategic Master Plan. Challenges include low research capacity and higher drug imports compared to domestic production. To promote self-reliance, more research on incrementally modified drugs (IMDs) is essential. This study analyzes the financial feasibility of developing IMD dosage forms for policy and investment decisions. A mixed-method approach, including type selection, investment models, cost structures, and financial analysis, was employed. Results favor sustained release, oro-dispersible tablet, and nasal spray formulations. IMD research and development took 7 to 13 years due to formulation complexity and …
Standardization And Dna Barcoding Of Cannabis In Thailand And Pharmacological Properties Of Cannabis-Based Thai Traditional Medicine Formula Extract (Kealomkeasan), Kanittha Nakkliang
Standardization And Dna Barcoding Of Cannabis In Thailand And Pharmacological Properties Of Cannabis-Based Thai Traditional Medicine Formula Extract (Kealomkeasan), Kanittha Nakkliang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Cannabis sativa L. subsp. Indica (Cannabaceae) has been used as a medicinal plant in various aspects. C. sativa has been part of Thai medicine for more than three centuries and its Ingredients in herbal medicine recipe. Kealomkeasan (KLKS) remedy is one of the Thai traditional medicines, consists of seven plants with an unequal part by weight (1:2:3:4:5:20:40) as follows: Cuminum cyminum L. fruits, Nigella sativa L. seeds, Foeniculum vulgare Miller fruits, Zingiber officinale Roscoe rhizomes, Plumbago indica L. roots, Cannabis sativa L. leaves and Piper nigrum L. seeds for relief of muscle pain and anti-inflammation. Recently, medical cannabis was officially …
Digital Nomadism In Southeast Asia: Its Cultural Identities And The New Labor Model, Wenjue Zhong
Digital Nomadism In Southeast Asia: Its Cultural Identities And The New Labor Model, Wenjue Zhong
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis examines the cultural identity of digital nomads in Southeast Asia and its impact on their evolving labor model. Employing qualitative interviews and document research, the study investigates the lifestyles of these contemporary nomads. The research reveals a finding: despite roaming abroad, digital nomads maintain a strong connection to their national identity. This intriguing phenomenon demonstrates the persistence of cultural heritage in shaping their self-identity. Unlike traditional global nomads, digital nomads display a more utility-oriented approach, where their nomadic lifestyle is deeply interwoven with their work status. Consequently, digital nomadism emerges as a unique labor model, reflecting the transformative …
Glocalization Of Bronze Drums In Southeast Asia: The Case Of Bronze Drums In State Ceremonies Of Thailand, Taixing Li
Glocalization Of Bronze Drums In Southeast Asia: The Case Of Bronze Drums In State Ceremonies Of Thailand, Taixing Li
Chulalongkorn University Theses and Dissertations (Chula ETD)
The Bronze Drum is a living specimen of Southeast Asian culture and a testimony to the development of Southeast Asian societies for more than 2,000 years. The Bronze Drum has been inherited dynamically hitherto, and the Thai state ceremonies still adopt it. However, current scholarship on Bronze Drums is confined chiefly to static studies, which caused the omission of the essence of glocalization. This thesis adopts the theory of glocalization, namely that the Bronze Drum is the result of the interpenetration of the global and the local, resulting in unique outcomes in a specific geographic location, and then applies an …
Assessing The Physical Conditions Of Motorcycle Taxi Stands And Comfort Conditions Of The Drivers In The Central Business District Of Bangkok, Nissa Phloimontri
Assessing The Physical Conditions Of Motorcycle Taxi Stands And Comfort Conditions Of The Drivers In The Central Business District Of Bangkok, Nissa Phloimontri
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research explores the current physical conditions of motorcycle taxi stands located near the BTS stations in the central business district (CBD) and the comfort conditions experienced by motorcycle taxi drivers at those stands. Stand conditions were assessed using design and location standards for transit stops. A total of 25 stands were surveyed and compared with design standards, considering factors such as location, physical form, and features. Stands that share similar characteristics were classified into stand typologies. Based on the environmental comfort model, questionnaires and in-depth interviews were conducted to evaluate the comfort levels of drivers, encompassing physical, functional, and …
Public-Private Partnerships For Implementing Sponge City Development : A Case Study Of Xiamen City, China, Ting Su
Chulalongkorn University Theses and Dissertations (Chula ETD)
To mitigate the disasters caused by extreme weather induced by climate change in cities, the Chinese government has proposed the implementation of sponge cities in recent years. However, the construction of sponge cities is characterized by significant investments, long project cycles, and many risks. It is difficult to implement the project only by relying on government investment. Therefore, Public-private Partnership (PPP) model is gradually applied to sponge cities' implementation. As a model of urban infrastructure implementation, PPP can significantly reduce stakeholders' risks in some respects and accelerate infrastructure implementation in sponge cities. However, the PPP model has some disadvantages. Therefore, …
Therapeutic Efficacy Of Subconjunctival Injectionof Canine Adipose-Derived Mesenchymal Stem Cells On Canine Spontaneous Chronic Corneal Epithelial Defect, Pechchalee Kengkla
Therapeutic Efficacy Of Subconjunctival Injectionof Canine Adipose-Derived Mesenchymal Stem Cells On Canine Spontaneous Chronic Corneal Epithelial Defect, Pechchalee Kengkla
Chulalongkorn University Theses and Dissertations (Chula ETD)
Spontaneous chronic corneal epithelial defects (SCCEDs) are important corneal injuries in dogs. Canine adipose-derived mesenchymal stem cells (cAD-MSCs) was used for treatment of various types of corneal ulcers in dogs. This study aimed to evaluate clinical outcomes and concentrations of tear fluid cytokine after subconjunctival injection of cAD-MSCs in canine SCCEDs. 9 canine SCCEDs eyes previously treated by debridement twice were included into this study. All eyes received a single subconjunctival injection of 1x106 cAD-MSCs. Ophthalmic examinations were undergone at day 7, 14 and 21 after treatment. Photographs of the cornea were taken to assess corneal epithelial defect, neovascularization and …
Production Of Pd-L1 Immune Checkpoint Inhibitor In Nicotiana Benthamiana, Thareeya Phetphoung
Production Of Pd-L1 Immune Checkpoint Inhibitor In Nicotiana Benthamiana, Thareeya Phetphoung
Chulalongkorn University Theses and Dissertations (Chula ETD)
Immune checkpoint antibodies disrupt the binding of receptor-ligand pairs which regulate immune response in cancer treatment. PD-1/PD-L1 pathway has become one target of the cancer immunotherapy approaches. Atezolizumab, the first FDA-approved antibody to PD-L1 in the treatment of metastatic urothelial, non-small cell lung, small cell lung, and hepatocellular cancers, is expressed in Chinese Hamster Ovary (CHO) cell lines with several limitations, i.e., high costs of production, limited-capacity yields, and pathogen risks. To overcome these drawbacks, the transient expression in Nicotiana benthamiana leaves, which provide expandable scalability and inexpensive costs, was investigated by co-infiltration of Agrobacterium tumefaciens GV3101 cultures harboring Atezolizumab …
การฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิตในประเทศไทย, วนัสนันท์ กันทะวงศ์
การฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิตในประเทศไทย, วนัสนันท์ กันทะวงศ์
Chulalongkorn University Theses and Dissertations (Chula ETD)
การศึกษาเรื่องนี้มีวัตถุประสงค์เพื่อศึกษากระบวนการฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิต ศึกษาความสัมพันธ์ของการฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิต และศึกษาทัศนคติของประชาชนเกี่ยวกับการฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิต เป็นการวิจัยแบบผสมผสาน (Mixed method) การวิจัยเชิงปริมาณ เครื่องมือที่ใช้ในการวิจัยคือ แบบสอบถาม โดยวิธีการเก็บข้อมูลกับกลุ่มตัวอย่าง จำนวน 400 คน ในจังหวัดเชียงราย เชียงใหม่ กรุงเทพมหานคร สมุทรสาคร ตราด และสุราษฎร์ธานี และการวิจัยเชิงคุณภาพด้วยการวิจัยเชิงเอกสาร 10 ปีย้อนหลัง พ.ศ. 2556 - 2566 และใช้เทคนิคการสัมภาษณ์แบบเจาะลึก ผู้ให้ข้อมูลสำคัญ จำนวน 15 คน ในหน่วยงานที่เกี่ยวข้องกับคาร์บอนเครดิต นักวิชาการและผู้เชี่ยวชาญ องค์กรไม่แสวงหากำไร ผลการศึกษาพบว่า การซื้อขายคาร์บอนเครดิตสามารถบรรเทาปัญหาภาวะโลกร้อน ก่อให้เกิดโครงการเพื่อสิ่งแวดล้อม และนำไปสู่การลงทุนรูปแบบใหม่ที่เป็นมิตรต่อสิ่งแวดล้อม ทั้งนี้การซื้อขายคาร์บอนเครดิตไม่ได้เป็นอาชญากรรมในตัวเอง หากแต่มีการใช้เป็นเครื่องมือกระทำความผิดและนำไปสู่การฟอกเขียว การฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิต ประกอบด้วย 6 องค์ประกอบ 1) ผู้กระทำ 2) กิจกรรมการฟอกเขียว 3) ฟอกเขียวด้วยกลไกคาร์บอน 4) เป้าหมาย 5) ผลกระทบ 6) กระทำด้วยเจตนา โดยผู้กระทำการฟอกเขียว ประกอบด้วย 1) บุคคลธรรมดา มีลักษณะอาชญากรคอปกขาว 2) นิติบุคคล มีลักษณะอาชญากรรมที่กระทำโดยบริษัทหรือธุรกิจองค์กร 3) รัฐ ที่เกี่ยวข้องกับอุบัติเหตุจากความประมาทจากการประกาศนโยบายของรัฐ หรือการดำเนินการผิดพลาดที่นำไปสู่การทุจริตคอร์รัปชัน การฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิตสามารถเกิดใน 3 รูปแบบ ได้แก่ การใช้ช่องโหว่ของกระบวนการซื้อขายคาร์บอนเครดิต การพึ่งพาการชดเชยมากเกินไป และการใช้กลไกการทำธุรกรรมของกลไกคาร์บอน ความสัมพันธ์ของการฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิต จำแนกเป็น 2 ลักษณะคือ การซื้อขายคาร์บอนเครดิตช่วยบรรเทาปัญหาภาวะโลกร้อน และการซื้อขายคาร์บอนเครดิตนำไปสู่ปัญหาสังคม 2 ลักษณะ ได้แก่ เป็นเครื่องมือการฟอกเขียว และ ก่อให้เกิดอาชญากรรมรูปแบบใหม่ในลักษณะห่วงโซ่อาชญากรรม ได้แก่ การฉ้อโกงประชาชน อาชญากรรมสิ่งแวดล้อม อาชญากรรมคอปกขาว อาชญากรรมทางเศรษฐกิจ อาชญากรรมไซเบอร์ การฉ้อโกงภาษี และการฟอกเงิน จากการศึกษาทัศนคติของประชาชนเกี่ยวกับการฟอกเขียวด้วยการซื้อขายคาร์บอนเครดิตปรากฎว่า มีความสัมพันธ์กับการบรรเทาปัญหาภาวะโลกร้อน โครงการเพื่อสิ่งแวดล้อม และการลงทุนที่เป็นมิตรต่อสิ่งแวดล้อมในระดับน้อย มีความสัมพันธ์กับไม่ช่วยลดการปล่อยก๊าซเรือนกระจก …
Impacts Of The Thai Canal On Liner Shipping Container Network, Krittitee Yanpisitkul
Impacts Of The Thai Canal On Liner Shipping Container Network, Krittitee Yanpisitkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This thesis proposes a mathematical model that imitates the flow of containers in the container liner shipping network — particularly, in the Indo-Pacific region, where the Strait of Malacca is located — in order to assess the potential impact of the proposed Thai Canal on such a network. This model is constructed based on a combination of two network problems, namely (i) the Multi-commodity Minimum Cost Network Flow Problem (MCNFP) and (ii) the Liner Shipping Fleet Deployment Problem (LSFDP), which allows a more realistic representation of international trade, while taking to account congestion at container ports at the same time. …
Poverty And Elderly Labor Supply In Thailand, Ruoshan Zhao
Poverty And Elderly Labor Supply In Thailand, Ruoshan Zhao
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aim of this study was to estimate the impact of poverty on elderly labor force participation and investigate the relationship between poverty and the intensity of work (i.e., working days). Labor supply by the elderly is increasingly one of the most concerning issues in developing countries. Based on studies on the elderly, researchers have made significant findings regarding the labor participation rates of older adults. However, there is a lack of research on the relationship between the labor force participation rate and poverty among the elderly in Thailand. This study used the probit regression model and Tobit regression model …
Whitening Of Calcium Carbonate Tailings Using Attrition Process: A Case Study Of Khar Toum Deposit, Lopburi Province, Thailand, Bancha Wongkaewphothong
Whitening Of Calcium Carbonate Tailings Using Attrition Process: A Case Study Of Khar Toum Deposit, Lopburi Province, Thailand, Bancha Wongkaewphothong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Calcium carbonate (CaCO3) is one of the industrial minerals that usually use in various applications in many industries (e.g., plastic, rubber, paint, paper). However, salable CaCO3 products need to meet the requirement for each application. Whiteness is one of property that really important especially the application that concern about the color like paint and paper industries. In this study, to recover and utilize out of spec ores, the effects of attrition scrubbing process (i.e., retention time and solid in pulp) on the whiteness of the CaCO3 tailings were investigated. The CaCO3 samples were screened to obtain –300, +300–600, +600–1000, +1000–2360, …
Development Of End-To-End Test Phantom For Stereotactic Radiosurgery Using Alanine Dosimeter, Aungsumalin Intang
Development Of End-To-End Test Phantom For Stereotactic Radiosurgery Using Alanine Dosimeter, Aungsumalin Intang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Alanine dosimeters are generally used in high-dose dosimetry, while accurate and precise dose delivery verification procedures are important in stereotactic radiosurgery (SRS). Hence, an end-to-end test is required. In addition, no end-to-end SRS test employing an alanine dosimeter has been established in Thailand. The objective of this study was to determine the dose accuracy of SRS VMAT plans in end-to-end test phantom using alanine dosimeter. The electron paramagnetic resonance (EPR) parameters were optimized in the 1-2000 cGy dose range. Following that, suitable parameters were used to investigate the alanine characteristics and estimate the uncertainty in radiation therapy dose range. The …
Identification And Characterization Of Transcription Factors Regulating Methionine Gamma-Lyase Gene Expressionin Durian Durio Zibethinus M. Pulps, Pinnapat Pinsorn
Identification And Characterization Of Transcription Factors Regulating Methionine Gamma-Lyase Gene Expressionin Durian Durio Zibethinus M. Pulps, Pinnapat Pinsorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Durian (Durio zibethinus L.) is an economic fruit crop in Southeast Asia. In Thailand, more than 200 durian varieties are found. Among them, two commercial cultivars which are Chanee and Monthong are mainly cultivated. Durian fruit releases a strong sulfuryl odor containing ethanethiol, methanethiol, and hydrogen sulfide during ripening. Methionine γ-lyase (MGL) is an enzyme responsible for α, γ-elimination of L-methionine into methanethiol, ammonia, and α-ketobutyrate. MGL gene is highly expressed in durian pulps during ripening concurring with methanethiol production during ripening. However, the function of durian MGL (DzMGL) has not been characterized. Thus, the enzymatic activity assay towards L-methionine, …
The Chinese People’S Intention To Participate In Livestream Environmental Marketing Communications Based On The Technology Acceptance Model (Tam), Yanfei Liu
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective of the study is to study the effects of perceived usefulness (PU), perceived ease of use (PEU), and perceived enjoyment (PE) on Chinese people's intention to participate in Livestream (IPL) environmental marketing communications based on the Technology Acceptance Model (TAM). The study is conducted in a quantitative approach by using online questionnaires as a tool to collect data from 200 respondents who are Chinese, aged between 18 to 60 years old, and have watched the Livestream shopping video about green products before. The finding result shows that overall respondents have a high level of agreement with PU (M=4.04), …
A Comparison Of Primary Stability Of Aggressive Thread Design Implant Using Two Different Technique In Different Bone Density: An In Vitro Biomechanical Study, Chandarong Huy
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: To investigate the correlation of aggressive thread implant in different bone qualities by two systems. Materials and Methods: A single space edentulism of tooth 11 maxillary models was prepared and inserted with artificial polyurethane bone type 1-4 for the preparation site. In total, 24 implants were divided into 4 groups according to the bone types. BLX implants with 4.5mm in diameter and 12 mm in length which are considered aggressive thread implants were used in this study. All implants were digitally planned, and the preparations were performed using computer-assisted guided surgery. After implant insertion, the primary stability was measured …
Neuroprotective Effects And Metabolomic Studies Of Oxyresveratrol In Rotenone-Induced Neuroblastoma Sh-Sy5y Cytotoxicity For A Preventive Approach To Parkinson’S Disease, Nureesun Mahamud
Chulalongkorn University Theses and Dissertations (Chula ETD)
Parkinson's disease (PD) is a long-term degenerative brain disorder. In 2022, WHO reported that PD prevalence has doubled over the last 25 years, causing disability and death more quickly than any other neurological disease. Although PD is still not curable, several studies showed some bioactive substances are linked with a lower risk of developing PD. Oxyresveratrol, a polyphenolic compound found in various plants, is the bioactive component previously reported the pharmacological activities such as antioxidant and neuroprotective effects. However, the specific molecular mechanisms and pathways involved in its effects are currently limited. This study aimed to examine the neuroprotective mechanisms …
Development And Evalution Of Technology For Rehabilitation Process Of Stroke Patients, Utpal Chandra Das
Development And Evalution Of Technology For Rehabilitation Process Of Stroke Patients, Utpal Chandra Das
Chulalongkorn University Theses and Dissertations (Chula ETD)
Rehabilitation after a stroke is crucial for patients to regain their functional abilities. Conventional rehabilitation methods can be time-consuming, inaccurate, and challenging to measure progress. This study proposes novel artificial intelligence(AI) based upper limb and lower limb rehabilitation approach for stroke patients. The proposed system comprises AI models: fuzzy logic rule-based and Convolutional Neural Network(CNN) Machine Learning(ML) models. The rule-based model incorporates the Fugal Meyar Method Assessment(FMA) to measure the angle of the patient’s upper and lower limbs during exercise using a camera(Sensor). The proposed robust hybrid fuzzy logic-based AI model continuously measures the desired angle, counts the repetition of …
Nail Cortisol For Welfare Assessment In Shelter And Owned Cats, Minh Pham Quoc Anh
Nail Cortisol For Welfare Assessment In Shelter And Owned Cats, Minh Pham Quoc Anh
Chulalongkorn University Theses and Dissertations (Chula ETD)
Shelter cats are vulnerable to stress due to the challenging circumstances they face, including confinement, unfamiliar environments, people, and animals. This vulnerability often leads to welfare issues, emphasizing the importance of assessing and improving their well-being. Measuring cortisol levels, a stress hormone, from nails has emerged as a non-invasive method to evaluate the stress response in humans and other animals. This study aimed to apply nail cortisol for welfare assessment in cats by measuring and comparing nail cortisol concentrations (NCCs) of owned cats and shelter cats living in different conditions. Nails of 31 owned cats (OC), 29 shelter cats living …