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Fatigue Study Of Cancellous And Cortical Stainless Steel Screws Used With Polymethymethacrylate And The Sop Plate System For The Immobilisation Of Vertebral Fracture And Luxation In Canine Cadavers, Mingrath Mekavichai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Globally, vertebral fracture and luxation (VFL) are one of the most common neurological injuries in dogs and cats. The standard care for vertebral body stabilisation of canine VFL are screws with polymethylmethacrylate (PMMA) and the string of pearls (SOP) plate system fixation. The VFL with implants are usually exposed to force in a repetitive or cyclic loading fashion. Indeed, stress on the implant cyclically at a load significantly less than its ultimate tensile strength can cause fatigue failure, one of the major causes of implant breakage. This study aims to compare the failure mode of four different implants using a …
อิทธิพลของรูปแบบการจัดกิจกรรมรับน้องใหม่ต่อความกลมเกลียวในกลุ่มนักศึกษาและความผูกพันกับคณะ : การวิเคราะห์อิทธิพลส่งผ่านการระบุตัวตนทางสังคม, พัชรวุฒิ สุภาคง
อิทธิพลของรูปแบบการจัดกิจกรรมรับน้องใหม่ต่อความกลมเกลียวในกลุ่มนักศึกษาและความผูกพันกับคณะ : การวิเคราะห์อิทธิพลส่งผ่านการระบุตัวตนทางสังคม, พัชรวุฒิ สุภาคง
Chulalongkorn University Theses and Dissertations (Chula ETD)
งานวิจัยนี้ศึกษาความสัมพันธ์ระหว่างกิจกรรมรับน้องใหม่ (แบบสร้างสรรค์ และไม่สร้างสรรค์) กับความกลมเกลียวในกลุ่มและความผูกพันด้านจิตใจต่อคณะภายในมหาวิทยาลัย โดยมีการระบุตัวตนทางสังคมเป็นตัวแปรส่งผ่าน กลุ่มตัวอย่างที่ใช้คือ นิสิต/นักศึกษา ระดับปริญญาตรี จากมหาวิทยาลัยในประเทศไทย จำนวน 331 คน ผลจากการวิเคราะห์โมเดลสมการโครงสร้าง (Structural Equation Modeling: SEM) ด้วยโปรแกรม LISREL Version 9.30 (Jöreskog & Sörbom, 2017) พบว่า กิจกรรมรับน้องใหม่แบบสร้างสรรค์มีอิทธิพลทางตรงทางบวกต่อความกลมเกลียวในกลุ่มอย่างมีนัยสำคัญทางสถิติที่ระดับ .01 ในขณะที่ไม่พบอิทธิพลทางตรงของกิจกรรมรับน้องใหม่แบบไม่สร้างสรรค์ต่อความกลมเกลียวในกลุ่ม ผลจากการวิเคราะห์อิทธิพลส่งผ่านพบว่า การระบุตัวตนทางสังคมเป็นตัวแปรส่งผ่านแบบบางส่วนของความสัมพันธ์ระหว่างกิจกรรมรับน้องใหม่แบบสร้างสรรค์และความกลมเกลียวในกลุ่ม และเป็นตัวแปรส่งผ่านแบบสมบูรณ์ของความสัมพันธ์ระหว่างกิจกรรมรับน้องใหม่แบบสร้างสรรค์และความผูกพันด้านจิตใจต่อคณะ นอกจากนี้ยังพบประเด็นที่น่าสนใจคือ กิจกรรมรับน้องใหม่แบบไม่สร้างสรรค์มีอิทธิพลทางบวกต่อการระบุตัวตนทางสังคมอย่างมีนัยสำคัญทางสถิติที่ระดับ .01 ในขณะที่ไม่พบอิทธิพลทางตรงของกิจกรรมรับน้องใหม่ทั้งแบบสร้างสรรค์และไม่สร้างสรรค์ต่อความผูกพันด้านจิตใจต่อคณะ แต่พบอิทธิพลส่งผ่านแบบสมบูรณ์ของการระบุตัวตนทางสังคมต่อความสัมพันธ์ระหว่างกิจกรรมรับน้องใหม่แบบไม่สร้างสรรค์กับความกลมเกลียวในกลุ่มและความผูกพันด้านจิตใจต่อคณะ
นวัตกรรมน้ำมันเตากำมะถันต่ำจากการผสมน้ำมันไพโรไลซิสสาหร่ายขนาดเล็กและน้ำมันหล่อลื่นใช้แล้ว, ศุภฤกษ์ อร่ามกิจโพธา
นวัตกรรมน้ำมันเตากำมะถันต่ำจากการผสมน้ำมันไพโรไลซิสสาหร่ายขนาดเล็กและน้ำมันหล่อลื่นใช้แล้ว, ศุภฤกษ์ อร่ามกิจโพธา
Chulalongkorn University Theses and Dissertations (Chula ETD)
น้ำมันไพโรไลซิสจากสาหร่ายขนาดเล็กเป็นทางเลือกของเชื้อเพลิงหมุนเวียนที่สามารถนำไปใช้ทดแทนเชื้อเพลิงฟอสซิลได้ เนื่องจากมีค่าความร้อนที่ดีและมีปริมาณกำมะถันต่ำ ส่วนน้ำมันหล่อลื่นใช้แล้วเป็นอีกทางเลือกหนึ่งของเชื้อเพลิงทดแทนที่มีราคาต่ำและเป็นขยะอันตรายที่มีการสนับสนุนให้ถูกนำกลับมาใช้ใหม่ จากที่องค์กรทางทะเลระหว่างประเทศประกาศให้มีการใช้น้ำมันเตากำมะถันต่ำ (กำมะถันน้อยกว่า 0.5% โดยน้ำหนัก) ในการขนส่งทางเรือ มีผลบังคับใช้ในวันที่ 1 มกราคม พ.ศ. 2563 และการผลิตน้ำมันเตากำมะถันต่ำจากเชื้อเพลิงปิโตรเลียมยังมีข้อจำกัดด้านต้นทุนและกระบวนการในการผลิต ผู้วิจัยพบว่าการผสมน้ำมันระหว่างน้ำมันไพโรไลซิสจากสาหร่ายขนาดเล็กและน้ำมันหล่อลื่นใช้แล้ว มีความเป็นไปได้ในการนำมาผลิตน้ำมันเตากำมะถันต่ำเพื่อตอบสนองความต้องการในอนาคต ในงานวิจัยนี้เลือกน้ำมันไพโรไลซิสที่ผลิตจากสาหร่ายสไปรูลิน่าเนื่องจากการเก็บเกี่ยวที่ง่ายและได้ผลผลิตน้ำมันสูง โดยนำสาหร่ายแห้งมาผ่านกระบวนการไพโรไลซิสด้วยเครื่องปฏิกรณ์ไพโรไลซิสแบบต่อเนื่องขนาด 3 ลิตร และน้ำมันหล่อลื่นใช้แล้วได้จากโรงงานปรับปรุงคุณภาพน้ำมันหล่อลื่นใช้แล้วด้วยกระบวนการตกตะกอนและกรองเพื่อแยกน้ำและสิ่งปนเปื้อนออก น้ำมันทั้ง 2 ชนิดถูกผสมด้วยอัตราส่วน 100:0, 80:20, 50:50, 20:80 และ 0:100 เพื่อทำการทดสอบคุณสมบัติตามมาตรฐาน ISO 8217 ซึ่งเป็นมาตรฐานของน้ำมันเตาที่ใช้ในเรือขนส่ง
ผลการศึกษาที่ได้ พบว่าการผสมน้ำมันไพโรไลซิสจากสาหร่ายขนาดเล็กในอัตราส่วน 20% และน้ำมันหล่อลื่นใช้แล้วในอัตราส่วน 80% ซึ่งเรียกในงานวิจัยนี้ว่า MLB20 มีความเป็นไปได้ในการใช้ผลิตน้ำมันเตากำมะถันต่ำในเชิงพาณิชย์มากที่สุด โดยมีคุณสมบัติที่สำคัญดังนี้ ความหนาแน่นที่ 15 องศาเซลเซียส 910.9 kg/m3 ความหนืดที่ 50 องศาเซลเซียส 87.26 mm2/s ปริมาณกำมะถัน 0.461% โดยน้ำหนัก ปริมาณขี้เถ้า 0.515% โดยน้ำหนัก ปริมาณน้ำ 4.1% โดยน้ำหนัก และค่าความเป็นกรด 5.4 mg KOH/g โดยพบว่า MLB20 มีคุณสมบัติผ่านเกณฑ์ของ ISO 8217 ทั้งหมด ยกเว้นเพียงปริมาณขี้เถ้า ปริมาณน้ำและค่าความเป็นกรด ซึ่งสามารถนำไปใช้พัฒนาในงานวิจัยในเชิงพาณิชย์ต่อไป
General Pseudo-Polynomials In Fq((1/X)), Rattiya Meesa
General Pseudo-Polynomials In Fq((1/X)), Rattiya Meesa
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this thesis, we study the integer-valued functions and pseudo-polynomials over a finite field. We establish explicit shapes of them and prove that the set of all pseudo-polynomials is an integral domain that is not a unique factorization domain. Difference and higher order differences of integer-valued functions and their properties are also presented.
Reactive Oxygen Species-Induced Global Dna Hypomethylation In Bladder Cancer Is Mediated Via Increased Formation Of 8-Hydroxy-2'-Deoxyguanosine, Patcharawalai Whongsiri
Reactive Oxygen Species-Induced Global Dna Hypomethylation In Bladder Cancer Is Mediated Via Increased Formation Of 8-Hydroxy-2'-Deoxyguanosine, Patcharawalai Whongsiri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Oxidative stress, as a consequence of the elevated reactive oxygen species (ROS), has been implicated in various chronic diseases including cancers by, for examples, causing oxidative DNA damage and altering epigenetic regulation. Long interspersed element-1 (LINE-1) is an only active retrotransposable elements in human DNA, comprising up to 17% of the whole genome. LINE-1 hypomethylation is reported in bladder cancer and evidently it is a consequence of oxidative stress. In this study, we investigated the expression of 5-methylcytosine (5-mC), 8-hydroxydeoxyguanosine (8-OHdG), LINE-1-endoced protein (ORF1p), histone H3K9me3 and HP1 alpha in bladder cancer tissues. Mechanistic insight into how oxidative stress affected …
The Dosimetric Evaluation On Photon Energy Effect For Cervical Carcinoma In 3d-Crt, Imrt, And Vmat Plans, Vanida Poolnapol
The Dosimetric Evaluation On Photon Energy Effect For Cervical Carcinoma In 3d-Crt, Imrt, And Vmat Plans, Vanida Poolnapol
Chulalongkorn University Theses and Dissertations (Chula ETD)
In the previous time, 3D-CRT technique has been considered as the primary treatment for cervical cancer treatment. Nowadays, advanced techniques, IMRT and VMAT, are used to treat because of the dosimetric and clinical benefit over 3D-CRT technique. However, each of these technique generates difference outcomes. The purpose of this study was to investigate the dosimetric outcomes between 6 and 15 MV photon energies in each 4 fields box 3D-CRT, 9 fields IMRT, and 2 arcs VMAT plans of five advanced cervical cancers using parameters of D95%, TC, HI, CI, CN from PTV, V45 Gy and V50 Gy from OARs, NTID, …
Effects Of Genistein On Oxidative Stress And Inflammation In Acute Pancreatitis Mice, Jumlongluk Sriko
Effects Of Genistein On Oxidative Stress And Inflammation In Acute Pancreatitis Mice, Jumlongluk Sriko
Chulalongkorn University Theses and Dissertations (Chula ETD)
Genistein (GEN), the most abundant isoflavones in soy, has similar structure to human estradiol. It has been reported the potent properties of GEN on antioxidant and anti-inflammation. The aim of this study was to investigate the effects of GEN on oxidative stress, inflammatory, and histopathology in acute pancreatitis induced by L-arginine in mice. Male ICR mice were randomly divided into 4 groups (6 mice in each group). Control (Con) group: mice were injected with 2% dimethyl sulfoxide (DMSO) once daily for 4 days, via IP. Acute pancreatitis (AP) group: mice were injected 2 times (1 hour interval) of 350 mg/100 …
Surface Proteomics Of Leptospira Interrogans Serovar Pomona, Praparat Thaibankluay
Surface Proteomics Of Leptospira Interrogans Serovar Pomona, Praparat Thaibankluay
Chulalongkorn University Theses and Dissertations (Chula ETD)
Leptospirosis is a re-emerging zoonosis of global distribution including Thailand. It caused by pathogenic Leptospira. The pathogenesis is not clear. Surface-exposed proteins (PSEs) are first part for interactions with host cells, immune system and should be potential targets for vaccine development. To date, many researches study only individual PSEs but the studies of surface proteomic is less. The study of surface proteomic will be important information for pathogenesis studies and search for vaccine candidate. This study aimed to identify surface proteomics of pathogenic Leptospira by surface biotinylation and surface shaving using proteinase K that has been used to identify surface …
Designing Efficient Petroleum Fiscal System For Mozambique, Nelson Victor
Designing Efficient Petroleum Fiscal System For Mozambique, Nelson Victor
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, tax regime is designed to attract investment and provide the contractor with fair return on investment, at the same time, provide the host government with adequate resources for rent, thereby resulting in win-win situation. This study analyses the existing petroleum fiscal regime in the Republic of Mozambique and proposes a more efficient and flexible regime. The analysis shows that the government take currently remains at around 39% while the contactors' net present value (NPV) increases as field sizes and oil prices increase. The current system is considered a regressive system which is inefficient in distributing wealth from oil profit. …
The Relationship Between Income And Food Intake In China, Xinfang Li
The Relationship Between Income And Food Intake In China, Xinfang Li
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigated the effect of food intake, which is considered a form of health investment, on income in China, accounting also for socioeconomic factors. It used the 2011 wave of the China Health and Nutrition survey, including 42,870 observations in the analysis. Six dependent variables, each representing a different measure of income, were explored. The main explanatory variables included a 3-day total food consumption (grams), a 3-day average intake of energy (kilocalories), a 3-day average intake of carbohydrate (grams), a 3-day average intake of protein (grams) and a 3-day average intake of fat (grams). Personal, household, and area characteristics …
Who Governs The Wasteland? BangkokS Informal Recycling Sector In Urban Waste Management, Vanessa Hongsathavij
Who Governs The Wasteland? BangkokS Informal Recycling Sector In Urban Waste Management, Vanessa Hongsathavij
Chulalongkorn University Theses and Dissertations (Chula ETD)
Amidst rapid population growth and urbanization, municipalities confront many challenges posed by waste generation, and its subsequent collection and disposal. In light of these challenges, an integrated solid waste management has emerged as an alternative and more holistic approach to tackling waste challenges, including a more serious consideration of power dynamics and relationships between different actors and interests. Integrated solid waste management in developing countries further reveals an active informal sector and various practices of informality in resource recovery and recycling. Yet, it remains unclear if solid waste management systems can further integrate the informal sector in such a way …
Examining The Creative Economy Policy In South Korea (2013 - 2017): The Case Of Seoul Global Startup Center, Natcha Khemnantakul
Examining The Creative Economy Policy In South Korea (2013 - 2017): The Case Of Seoul Global Startup Center, Natcha Khemnantakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research examines the structure of the Creative Economy Policy in South Korea and the Seoul Global Startup Center by studying its structure and characteristics. The research was conducted through the collecting of primary data by an in-depth interview and analyzed using the SWOT analysis. This research points out that government agencies set goals and strategies for an effective Creative Economy Policy to support Korean citizen in turning their ideas into valuable products and services. The government also made efforts in establishing centers to support startups in conducting research and development. Among numerous centers in Korea, the Seoul Global Startup …
Metallosalen-Based Polymers For Reduction Of Carbon Dioxide, Cherawat Kaewyai
Metallosalen-Based Polymers For Reduction Of Carbon Dioxide, Cherawat Kaewyai
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research, a series of novel asymmetric copper- and nickel-salens bearing thiophene-based substituents were successfully synthesized and characterized by nuclear magnetic resonance spectroscopy and mass spectrometry. Homogeneous electrocatalytic activities of these monomers toward reduction of CO2 were investigated using cyclic voltammetry technique. Electrochemical studies showed these salen monomers are able to serve as catalysts in the electrochemical reduction of CO2 due to the significantly increase of the current observed under CO2-saturated condition, compared with those found under the N2-saturated one. Results also revealed that insertion of the carbon-carbon triple-bond between the thiophene-based substituents and the salen core led to …
Vector Competence And Correlation Of Midgut Microbiota Of Aedes Albopictus For Chikungunya Virus, Ranida Tuanudom
Vector Competence And Correlation Of Midgut Microbiota Of Aedes Albopictus For Chikungunya Virus, Ranida Tuanudom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Chikungunya virus (CHIKV) is an important mosquito-borne virus and transmission cycle of this virus involves mosquito vectors (Aedes albopictus and Aedes aegypti) and infected vertebrate hosts. The recently studies found that CHIKV outbreak in 2007 have been Ae. albopictus as an important vector which it was susceptible to genetic variation of CHIKV and induce to virus virulence. However, the study about vector competence for CHIKV in Thailand is limited. Moreover, the previous study indicates the impact of midgut microbiota of mosquito to viral infection. This study was conducted to examine the effects of CHIKV titers in blood meals on vector …
Characterization Of Non-Volatile Chemical Constituents In Thai Wineusing Liquid Chromatography-Tandem Mass Spectrometry, Premkamol Karapakdee
Characterization Of Non-Volatile Chemical Constituents In Thai Wineusing Liquid Chromatography-Tandem Mass Spectrometry, Premkamol Karapakdee
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this work, high performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was developed and validated for simultaneous determination of targeted non-volatile compounds, such as five organic acids and twenty phenolic compounds, in 19 wine samples including 2 imported red wines, 15 Thai red wines and 2 fruit wines, using the following HPLC-MS/MS conditions: a C18 analytical column and gradient elution of A: B mobile phase at flow rate 0.4 mL/min, where A and B are 0.1% v/v formic acid in water and 0.1% v/v formic acid in methanol. The limit of detection (LOD) and the limit of quantitation (LOQ) for these …
Factors Affecting Debt Decisions: Syndicated Loans Vs. Corporate Bonds, Theerut Winaikosol
Factors Affecting Debt Decisions: Syndicated Loans Vs. Corporate Bonds, Theerut Winaikosol
Chulalongkorn University Theses and Dissertations (Chula ETD)
Following the recent developments and expansions in syndicated loans market, syndicate loans are currently accounted for around one-third of borrowers' total public debt and equity financing. It is one of the main alternative debt instruments for corporations. Syndicated loans are bank loans by their settings but also have many of the corporate bonds' characteristics. These characteristics have made syndicated loans hybrid debt instruments which combining features of both bank loans and bonds. This study investigates the financial factors behind syndicated loans issuance for a comprehensive sample from 2000 to 2016 of United States non-financial companies which are listed in New …
Uv-A And -B Blocking Agents For Psoriasis Phototherapy, Sruangsuda Mawaha
Uv-A And -B Blocking Agents For Psoriasis Phototherapy, Sruangsuda Mawaha
Chulalongkorn University Theses and Dissertations (Chula ETD)
UV-A and -B blocking agents are essential components for the formulation of topical cream for psoriasis phototherapy. In this research, many natural compounds were discovered as potent UV-A and UV-B blocking agents, but small number could absorb narrowband UV-B. Quercetin hydrate, oxyresveratrol and curcumin were good UV-A blocking agents, while catechin, hesperetin, lutein and naringenin were proper for UV-B blocking agents. Berberine chloride hydrate, demethoxycurcumin and mansonone G were UV-A and -B blocking agents. From random combination, the mixture of mansonone G 0.010 % w/v and quercetin hydrate 0.0025 % w/v was disclosed to be a right choice for this …
Bioactive Compounds With An Inhibitory Activity Against Osteoclast Differentiation And Mechanisms, Supatta Chawalitpong
Bioactive Compounds With An Inhibitory Activity Against Osteoclast Differentiation And Mechanisms, Supatta Chawalitpong
Chulalongkorn University Theses and Dissertations (Chula ETD)
โรคกระดูกพรุนเป็นปัญหาสุขภาพที่สำคัญอย่างหนึ่งของสังคมผู้สูงอายุ สาเหตุหลักของภาวะดังกล่าวเกิดจากความไม่สมดุลของเซลล์ที่ทำหน้าทีสร้างกระดูก (osteoblast) และเซลล์ที่ทำหน้าที่สลายกระดูก (osteoclast) การลดลงของมวลกระดูกในผู้สูงอายุนำมาซึ่งความเสี่ยงในการแตกหักของกระดูก จุดประสงค์ของการศึกษาครั้งนี้ คือ การคัดกรองสารออกฤทธิ์ทางชีวภาพที่มีฤทธิ์ในการต้านการเปลี่ยนสภาพของเซลล์สลายกระดูกและกลไกการออกฤทธิ์ของสารนั้นๆ ในกลุ่มสารทดสอบอนุพันธ์สาร (3S)-1-(3,4-dihydroxyphenyl)-3-hydroxy-7-phenyl-(6E)-6-heptene (DHPH) และ กรดไซเปอเรโนอิก (Cyperenoic acid) ซึ่งสกัดได้จากส่วนเหง้า Curcuma comosa Rox. และราก Croton crassifolius Geiseler. ตามลำดับ มีฤทธิ์แรงในการต้านการเกิดเซลล์สลายกระดูก ในระดับ in vitro ใช้เซลล์จากไขกระดูกที่ถูกกระตุ้นด้วย receptor activator of nuclear factor-κB ligand (RANKL) DHPH มีฤทธิ์ในการยับยั้งการเปลี่ยนสภาพไปเป็นเซลล์สลายกระดูก โดยยับยั้งการเกิด TRAP-positive multinucleated cells (TRAP+ MNCs) ที่ระดับความเข้มข้นยับยั้งกึ่งหนึ่ง (IC50) 325±1.37 นาโนโมลาร์ การยับยั้งดังกล่าวสอดคล้องกับการลดต่ำลงของสัญญาณภายใต้การกระตุ้นของ RANKL โดยรวมถึงวิถี Mitogen-activated protein kinases (MAPKs) เช่น ERK (p44/42) และ p38 แต่ไม่มีผลต่อวิถี NF-κB โดยผลของสารดังกล่าวยังส่งผลกระทบต่อระดับของ transcription factor เช่น nuclear factor of activation T cells (NFATc1) และ c-Fos ซึ่งมีความสำคัญมากในการเปลี่ยนสภาพเป็นเซลล์สลายกระดูก DHPH ลดการกัดกร่อนกระดูก (bone resorption) บนแผ่นกระดูก (bone slices) นอกจากนั้นสาร DHPH ยังสามารถเพิ่มกิจกรรมของเอนไซม์ alkaline phosphatase (ALP) ที่เกี่ยวข้องกับการเปลี่ยนสภาพของเซลล์สร้างกระดูกในเซลล์ชนิด MC3T3-E1 ในกรณีของกรดไซเปอเรโนอิกนั้น พบว่าสามารถลดการเกิด TRAP+ MNCs ที่ระดับความเข้มข้น IC50 ที่ 36.69±1.02 …
Carbon Nanotube/Polymer Composite Membrane For Co2 Capture, Pacharaporn Yaisanga
Carbon Nanotube/Polymer Composite Membrane For Co2 Capture, Pacharaporn Yaisanga
Chulalongkorn University Theses and Dissertations (Chula ETD)
Membrane gas absorption (MGA) was applied for carbon dioxide capture due to its unique potential, such as independent adjustment of gas and liquid, compact equipment installation, and sizable module. However, a major issue of MGA is membrane wetting, causing lower absorption efficiency and membrane damages. Hydrophobicity is one of the key parameters to improve membrane property for solving such problem. This thesis focused on using carbon nanotubes as the filler to composite with polyacrylonitrile (PAN) or polyvinylidene fluoride (PDVF) via a phase inversion technique to improve membranes hydrophobicity. In case of PAN, the results showed that the addition of CNT …
Novel Shape Memory Polymer From Bio-Based Polybenzoxazine/Bio-Based Epoxy Copolymers, Phakakrong Hombunma
Novel Shape Memory Polymer From Bio-Based Polybenzoxazine/Bio-Based Epoxy Copolymers, Phakakrong Hombunma
Chulalongkorn University Theses and Dissertations (Chula ETD)
Shape memory polymers (SMPs) are known as smart polymer materials which can be deformed and fixed in a temporary shape and can recover to its original shape upon an external stimulus such as temperature which is the main stimulus for general SMPs. In this research, a renewable natural resource based on vanillin-furfurylamine benzoxazine (V-fa) and eugenol-furfurylamine benzoxazine (E-fa) are developed to substitute the use of petroleum based polybenzoxazine. The as-synthesized V-fa and E-fa show the degradation temperature at 5% weight loss to be as high as 343 and 310°C and char content to be 66 and 54%, respectively. Effects of …
Anti-Angiogenic And Cytotoxic Activities Of Rotenoids From Derris Trifoliata Lour., Yanisa Mittraphab
Anti-Angiogenic And Cytotoxic Activities Of Rotenoids From Derris Trifoliata Lour., Yanisa Mittraphab
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to isolate metabolites of D. trifoliata stem and to evaluate their cytotoxic and anti-angiogenic activities. Chromatographic fractionation of the EtOAc led to the isolation of eight known rotenoids (1-2, 4-6, 11-12 and 15). All compounds were first evaluated for their cytotoxicity against three cancer cell lines; human cervical carcinoma (CaSki), colon cancer (HCT-116), hepato carcinoma (Hep-G2) and normal human colon epithelial (CCD841) cells. All Compounds showed cytotoxicity against HCT-116 with IC50 ranging 0.12-11.21 µM, while they were weak or no activity against Hep-G2 and CaSKi cells. Moreover, it was found that 12a-hydroxyrotenone (11) potently inhibited migration of …
Travel Time Estimation And Prediction For Urban Arterial Roads, Porntep Puangprakhon
Travel Time Estimation And Prediction For Urban Arterial Roads, Porntep Puangprakhon
Chulalongkorn University Theses and Dissertations (Chula ETD)
Travel time information has been accepted as the core of advanced traveler information systems (ATIS) and advanced traffic management systems (ATMS). Providing the accurate travel time information to traffic operators and travelers allows them to make informed decisions, leading to more advantage for individual road users and the entire transportation system. Most of the traffic information providers normally deliver the current traffic conditions or current travel times to public assuming the state of traffic remains constant in the near future. Aimed at the more effective applications, short-term future traffic conditions have been proposed as a valuable piece of information in …
Geoarchaeology Of Ancient Site Settlement At Eastern Thungkula Ronghai, Srisaket And Yasothon Provinces In Northeast Thailand, Patcharaporn Ngernkerd
Geoarchaeology Of Ancient Site Settlement At Eastern Thungkula Ronghai, Srisaket And Yasothon Provinces In Northeast Thailand, Patcharaporn Ngernkerd
Chulalongkorn University Theses and Dissertations (Chula ETD)
Archaeology in Thailand is generally associated with geological application. In this work, the relationship between ancient site settlement and geomorphology is carried out under geoarchaeological approach. Study area is located on the eastern Thungkula Ronghai (TKR) bordered between Mun and Chi Rivers in Srisaket and Yasothon where many archaeological sites have been found. The research focuses on aerial photograph and satellite imaginary interpretation, application of ground penetrating radar (GPR) on sand splays morphology and GIS software to analyze ancient site location on geomorphology for reconstructing the relationship of human past with their landscapes. Results indicate the interesting landforms of the …
Prototype Development Of Small Scale Transportable Fuel Production System For Agricultural Byproducts, Jurarat Nisamaneenate
Prototype Development Of Small Scale Transportable Fuel Production System For Agricultural Byproducts, Jurarat Nisamaneenate
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objective is to study the potential of peanut shell waste and cassava rhizome conversion using a modular fixed bed gasifier coupled with thermal integration unit. The thermal integration unit improved gasification reaction in which lower tar content and high gas production efficiency can be achieved. The air flow rate had integrated effects on product yield and composition; higher air flow rate resulted in higher gas yield with less tar and char. The result from peanut shell gasification indicated the optimal conditions without catalyst addition at air flow rate of 3.06 m3/hr where carbon and hydrogen conversions were 87.10% and …
The European Union(Eu) As A Global Actor --- Internationalisation Of Eu Fisheries Policy And Its Impact On Third Countries:Case Study Of Thailand, Ran Lu
Chulalongkorn University Theses and Dissertations (Chula ETD)
The concept of global management of marine resources, especially fisheries governance is not a radically new topic. After World War II, mainly through the UN, FAO and increasing regional institutions, regulatory and implementing mechanisms began incrementally forming. The EU, as a global actor, vertically, absorbed these universal regulations with feedback from its experimentalist governance[1] and then uploaded its “Europeanized” ideas to the international arena, meanwhile, horizontally, externalizing the EU model to third countries. This thesis will focus on the role of the EU as an international actor in the field of fisheries policy by analyzing the IUU (illegal, unreported and …
The Joint Effects Of Management Incentives And Perceived Locus Of Causality On Management Earnings Forecast Disclosures, Kanjana Phonsumlissakul
The Joint Effects Of Management Incentives And Perceived Locus Of Causality On Management Earnings Forecast Disclosures, Kanjana Phonsumlissakul
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigates the effect of management incentives (directive and transparency) and locus of causality (internal and external) on the willingness of managers to disclose management earnings forecast reports and the accuracy of management's earnings forecast information. The experimental findings show that managers with directive incentives are less likely to disclose the earnings forecast and provide less accurate information to market participants than managers with transparency incentives, for both point and range forecast forms. In addition, locus of causality contributes to the accuracy of management earnings forecast information when the forecasts suggest underperformance, but the findings reveal no significant differences …
Effects And Mechanisms Of Porcine Reproductive And Respiratory Syndrome Virus (Prrsv) Type 1 And Type 2 On The Permeability And Viability Of Porcine Endometrial Epithelial Cells, Dran Rukarcheep
Chulalongkorn University Theses and Dissertations (Chula ETD)
Both PRRSV types 1 and 2 revealed the sign of reproductive disorders associated with a lesion at implantation sites. Impairment of maternal glandular endometrium cell integrity and function by PRRSV infection may impact a proper nourishing fetus. This research was aimed to examine the effects of PRRSV type 1 and type 2 directly on the viability and barrier function of the endometrium using porcine glandular endometrial epithelial cell culture (PEG). The comparison of the route and the strain of PRRSV infection coinciding with their virulent in reproductive epithelia were considered. PEG cells isolated from the 4-6 months old PRRSV-free-herd gilts …
Group Divisible Designs With Two Groups And Three Associate Classes, Ladamas Saiphet
Group Divisible Designs With Two Groups And Three Associate Classes, Ladamas Saiphet
Chulalongkorn University Theses and Dissertations (Chula ETD)
No abstract provided.
Cloning And Characterization Of Bacterial Mannanase Isolated From Dynastes Hercules Larvae, Sitipon Leerawatthanakun
Cloning And Characterization Of Bacterial Mannanase Isolated From Dynastes Hercules Larvae, Sitipon Leerawatthanakun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Bacterial isolate HM7 was isolated from Dynastes hercules larvae excrement. It was identified as Bacillus sp. by 16S rRNA gene analysis. When the bacteria were cultured for β-mannanase production in medium containing konjac flour it had the highest specific activity of 138 U/mg at 36 h, and when cultured in medium containing coconut meal it had the highest specific of 114 U/mg at 48 h. The 1089 base pairs long of a β-mannanase encoding gene (Man26HM7) was successfully cloned and expressed in Escherichia coli BL21 (DE3), using pET21-b expression system. The enzyme was purified and characterized. The optimal condition MAN26HM7catalysis …
Ammonium Removal And Biomass Production By Unicellular Cyanobacterium Synechococcus Sp., Piroonporn Srimongkol
Ammonium Removal And Biomass Production By Unicellular Cyanobacterium Synechococcus Sp., Piroonporn Srimongkol
Chulalongkorn University Theses and Dissertations (Chula ETD)
Using microalgae as a biofuel feedstock has played more attention over a decade. The cultivation of microalgae requires high water use and high initial investment that can make the process still not economically appealing. This study attempted to examine the potential for using brackish shrimp aquaculture effluents as culture medium for algal biomass production. To investigate whether algae could be used to remove ammonium from brackish shrimp aquaculture wastewater, marine cyanobacterium, Synechococcus sp. was cultured in BG-11 medium supplemented with Turks Island salt solution and different concentrations of NH4Cl (10-40 mg N L-1) for 18 days. The results showed that, …