Digital Commons Network^™

Effect Of Occupational Welding Fume Exposure On Hemostatic & Inflammatory Blood Parameters And Cardiovascular Risks On Welders And Non-Welders In Confined Space: A Longitudinal Study, Ning Li

Chulalongkorn University Theses and Dissertations (Chula ETD)

Occupational welding fumes contains varies of toxic metal particles and may affect cardiovascular system like the Particulate Matters (PM). The hypothetical mechanisms of welding fume toxicity center on oxidative stress and inflammatory, similar as the mechanisms that link PM2.5 and cardiovascular diseases (CVDs). The popular mechanisms on toxicity of welding fumes agreed that PM was associated with increased WBC and neutrophil counts, and increased WBC counts lead to higher Cardiovascular risks and Coronary heart disease risks.Urine Mn and Cr level in the welder group was significantly higher than the non-welder group (Mn: 0.96 VS 0.22 ug/g creatinine, p < 0.001; Cr: 0.63 VS 0.22 ug/g creatinine, p < 0.01). One third of the non-welders were in the high metal-exposed group. When all the participants were divided by occupation type, two times measurements revealed that Hct, WBC and Eosinophil indices of the welder groups were significantly higher (all p < 0.05). Linear regression models showed that, comparing to non-welders, welding could cause alterations to most hemostatic indices majorly by effecting an increase: Hct (β = 0.015, p = 0.007), WBC (β = 0.047, p = 0.033), Eosinophil ratio % (β = 0.345, p = 0.001). When all the participants were divided by metal level groups, there was bidirectional relationship between urine Mn level and WBC count in the linear regression models ((β = - 0.049, p = 0.045 and β = 0.059, p = 0.007, separately for starting and ending point). The study participants (both welders and non-welders) had an average systolic BP in the “high normal” range (Welders: 125.21 ± 11.23 mmHg for systolic BP Non-welders: mean = 126.33 ± 11.41 mmHg for systolic BP). Systolic blood pressure of the welder group increased significantly higher than the non-welder group after one year follow up (welder group VS non-welder: 4.13 ± 11.76 VS - 0.15 ± 6.60 mmHg, p = 0.037).

Family And Household Characteristics And Violent Disciplinary Practices Towards The Children In Myanmar: An Analysis Of 2015-2016 Myanmar Demographic And Health Survey, Nyan Linn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Background: Violence against children is one of the challenging public health problems. Violent disciplines not only affect negative health impacts but also are against children's right. However, those violent methods are still widespread across the countries, especially within the family. For prevention and control, it is required to clearly understand the country-specific information of violent child disciplines. In Myanmar, there are very few studies focusing on this area. This study was aimed to investigate the prevalence and factors associated with violent disciplines against children in Myanmar.Methodology: This study was a secondary data analysis of nationally representative 2015-2016 Myanmar Demographic and …

Comparison Of Learning Effectiveness Between Physical Classroom And Online Learning For Dental Education During The Covid-19 Pandemic, Chun-Pin Chiang, Julia Chang, Ling-Hsia Wang, Tzu-Chiang Lin, Feng-Chou Cheng

Journal of Dental Sciences

Abstract Background/purpose Online learning has been used to continue dental education activities during the coronavirus disease 2019 (COVID-19). This study aimed to compare the learning effectiveness between physical classroom and online class learning for dental education during the COVID-19 pandemic by the questionnaire survey. Materials and methods A questionnaire-based online survey was used to evaluate the learning effectiveness on the dental students who took the compulsory course entitled “oral pathology and diagnosis” in School of Dentistry, National Taiwan University in 2021. Student's t -test and Mann–Whitney U test were used to analyze the difference in learning effectiveness between physical classroom …

Effect Of Online Learning For Dental Education In Asia During The Pandemic Of Covid-19, Guang Hong, Tsai-Yu Chang, Ming-Lun Hsu, Jae-Sung Kwon, Mf Lindawati S Kusdhany

Journal of Dental Sciences

Abstract Background/purpose Online learning has been utilized in the world to continue educational activities in dentistry, which was severely affected by the pandemic of coronavirus disease 2019 (COVID-19). The purpose of this study was aimed to evaluate the effect of online learning during the pandemic of COVID-19 in different dental schools of different countries in Asia by the questionnaire survey. Materials and methods Mantel-Haenszel chi-square tests were used to analyze the difference between dental schools with and without shutdown. A questionnaire-based online survey was used to evaluate the online learning effect on undergraduate students in 13 dental schools of 7 …

The Biocompatibility And Mineralization Potential Of Mineral Trioxide Aggregate Containing Calcium Fluoride–An In Vitro Study, Yong-Bum Cho, Miyoung Lim, Minju Song, Chan-Ui Hong

Journal of Dental Sciences

Abstract Background/purpose MTA is used to induce hard tissue regeneration in various procedures. This study evaluated the biocompatibility and mineralization potential of mineral trioxide aggregate (MTA) containing calcium fluoride (CaF2). To verify if the change of components affected physical properties, the setting time, solubility, and surface roughness were measured. Materials and methods Human dental pulp cells (HDPCs) were treated with powder and set MTA containing CaF2 (0, 1, 5, and 10 wt %). The proliferation of HDPCs was investigated using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. The mineralization potential of HDPCs was investigated with the relative gene expression of alkaline phosphatase (ALP), …

Memories Of The Algerian War: A Historiography From Independence To The Present, Melissa Rosenthal

History - Master of Arts in Teaching

I. Synthesis Essay………………………………..1

II. Primary Documents and Headnotes………...19

III. Textbook Critique……………………………...41

IV. New Textbook Entry…………………………..44

V. Bibliography………………………………….....47

Hybrid Teaching Mode Including Physical, Online, And Flipped Classroom Learning For Dental Education In Taiwan, Chuan-Hang Yu

Journal of Dental Sciences

No abstract provided.

From Civil Liberties To Social Contract Theory: Hobbes' And Locke's Influence On The Early American Republic, Evan A. Krasner

History - Master of Arts in Teaching

I. Synthesis Essay………………………………..4

II. Primary Documents and Headnotes………...18

III. Textbook Critique……………………………...31

IV. New Textbook Entry…………………………...33

V. Bibliography………………………………….....35

Patient-Reported Outcomes For The Immediate Loading Of Mandibular Overdentures Supported By Two Implants Soon After Implant Surgery, Yuriko Komagamine, Manabu Kanazawa, Daisuke Sato, Maiko Iwaki, A. Miyayasu, Shunsuke Minakuchi

Journal of Dental Sciences

Abstract Background/purpose No studies have comprehensively assessed short-term patient-reported outcomes after the provision of overdentures supported by two immediate implants. The purpose of this study was to evaluate short-term patient-reported outcomes for mandibular overdentures retained by ball attachments on two immediately loaded implants. Materials and methods Nineteen participants with mandibular edentulism were provided with overdentures retained by ball attachments on two immediately loaded, unsplinted implants. The participants' self-assessment of their dentures and oral health-related quality of life were evaluated with the 22-item Patient's Denture Assessment (PDA), and the 19-item Japanese version of the Oral Health Impact Profile (OHIP-EDENT), respectively. Patient …

The Spatial Variability Of Soil Physical Properties Of Different Sized-Gap In A Subtropical Forest, China, Supaporn Buajan, Jinfu Liu, Zhongsheng He

Applied Environmental Research

Gap areas create heterogeneity in the spatial environment, which is important to plant regeneration and diversity. Soil physical properties (SPP) are factors that affect plant growth. This study aims to assess the spatial variability of SPP in different gap sizes and to determine the effect of gap size on SPP. We used geostatistical analysis to illustrate the spatial patterns of SPP variability within 9 gaps, classified into three sizes (small, medium, and large) and under the canopy at the Castanopsis kawakamii natural reserve forest, the soil samples were collected entire gap area at 20 cm depth with the grid system …

Patient-Reported Outcomes With Immediate-Loaded Two-Implant-Supported Mandibular Overdentures: Results Of A 5-Year Prospective Study, Yuriko Komagamine, Manabu Kanazawa, Daisuke Sato, Maiko Iwaki, Anna Miyayasu, Shunsuke Minakuchi

Journal of Dental Sciences

Abstract Background/purpose Few studies have comprehensively assessed long-term patient-reported outcomes for overdentures supported by two immediate implants. The purpose of the study was to evaluate patient-reported outcomes of immediately loaded two-implant-supported overdentures retained by ball attachments over a 5-year evaluation period. Material and methods Nineteen participants with edentulous mandibles were provided with immediately loaded two-unsplinted-implant-supported overdentures retained by ball attachments. The participants completed the Japanese version of the Oral Health Impact Profile (OHIP)-EDENT-19 and the Patient's Denture Assessment (PDA). Additionally, patient satisfaction was measured by a 100-mm visual analog scale (VAS). Measurements were performed at baseline, and at 1 and …

Spatial-Temporal Patterns Of Modis Active Fire/Hotspots In Chiang Rai, Upper Northern Thailand And The Greater Mekong Subregion Countries During 2003-2015, Chidsanuphong Chart-Asa

Applied Environmental Research

For the past decade, smoke-haze pollution from forest fires and open burning has been a yearly recurring problem over Chiang Rai and other provinces in Upper Northern Thailand, along with other countries in the Greater Mekong Sub-region. Remote-sensing active fire/ hotspot data are currently used for monitoring the forest fires and open burning in the sub-region. This study aimed to extend the current monitoring work by performing spatial and temporal analysis to examine the patterns, either globally or locally, of MODIS active fires/hotspots during the critical smoke-haze pollution periods from January to April in 2003-2015. Fire radiative power was used …

Centuries Of Heat Waves Over India During 20th And 21st Century, Naveena Neelam, Gubbala C. Satyanerayana, Kotla S. Rao, Nandivada Umakantha, Dharma Raju

Applied Environmental Research

An assessment of temperature extremes is made for the Indian subcontinent to identify the changes since 1951 to 2015, and for the future climate periods till 2100 for all the 21 CMIP5 (Coupled Model intercomparision Project phase 5) models and the representative concentration pathways RCP4.5 and RCP8.5 were examined for the period from 1 March to 31 May to characterize the heat waves in future climates and mean maximum and mean minimum bias were evaluated for the Indian subcontinent. Later two highest recorded temperature regions were chosen Northwest & Central India (NW&CIN) and only central India (CIN) box and the …

Source Contribution Of 1,3 Butadiene In The Vicinity Of Petrochemical Industrial Area, Nuttakit Sukjit, Sarawut Thepanondh, Suphaphat Kwonpongsagoon, Wanida ๋Jinsart, Lalidaporn Punya, Pattaranan Hanma

Applied Environmental Research

Emissions and ambient concentrations of 1,3 butadiene released from the synthetic rubber industries in the largest petroleum and petrochemical complex in Thailand were evaluated in this study. The industrial emissions in this analysis were those emitted from process fugitive, combustion stack, flare, and wastewater treatment facility. It was found that wastewater treatment units were the largest emission source among other potential sources. The contribution of emission from wastewater treatment plants were about 92% of total 1,3 butadiene emission. The extent and magnitude of 1,3 butadiene in ambient air were further evaluated through the simulation of AERMOD dispersion model using these …

Land Cover Classification Based On Uav Photogrammetry And Deep Learning For Supporting Mine Reclamation: A Case Study Of Mae Moh Mine In Lampang Province, Thailand, Tejendra K. Yadav, Polpreecha Chidburee, Nattapon Mahavik

Applied Environmental Research

Detailed, accurate, and frequent mapping of land cover are the prerequisite regarding areas of reclaimed mines and the development of sustainable project-level for goals. Mine reclamation is essential as the extractive organizations are bounded by-laws that have been established by stakeholders to ensure that the mined areas are properly restored. As databases at the mines area become outdated, an automated process of upgrading is needed. Currently, there are only few studies regarding mine reclamation which has less potential of land cover classification using Unmanned Aerial Vehicle (UAV) photogrammetry with Deep learning (DL). This paper aims to employ the classification of …

Quantifying Avoidable Food Waste And Identifying Its Underlying Causes: A Case Study Of A University Dormitory In Thailand, Shimpei Iwasaki, Suphat Prasopsin, Thamarat Phutthai

Applied Environmental Research

To develop well-planned and effective policies and programs for reducing avoidable food waste, it is important to quantify the actual food waste level in particular settings and assess relationships among consumers’ awareness, attitudes, and behaviors. Recognizing these considerations, this paper measured avoidable food waste generated by university students living in dormitory buildings and identified its underlying causes in the case of Kanchanaburi campus, Mahidol University, Thailand. The study applied a food waste composition survey 18 times between January and May 2019 while administering questionnaires in October 2019 to the dormitory students. Based on these measures, the study identified 1,417 instances …

Why Should Different City Characteristics Customize The Rate Of Pollution Charge? Evidence Of Factors Affecting Willingness-To-Pay For Wastewater Management In Thailand, Kwanmanas Meethavorn, Chanathip Pharino

Applied Environmental Research

A challenge for wastewater management is enhancing the efficiency of resource allocation. Polluter Pays Principle is a wastewater charge collection approach that could help support the financial burden faced by many countries. Tailor-made policy implementation based on city characteristics is critical to the success of implementing a national policy to fit well in different local contexts. This study examined gaps for improving municipal wastewater management systems in Thailand through in-depth interviews and a questionnaire survey to identify the factors influencing households’ perception and willingness to pay in three different cities. A contingent variation method technique was used to evaluate the …

Fire Drivers Affecting Forest Fire Occurrences In The Tropical Mixed Broad-Leaved Forests Of Nepal, Krishna Bahadur Bhujel, Rejina Maskey Byanju, Ambika P. Gautam, Ramesh Prasad Sapkota, Udhab Raj Khadka

Applied Environmental Research

Forest fires triggered by various natural and anthropogenic drivers are increasing and threatening forest ecosystems across the globe. In Nepal, the high value Tropical Mixed Broad-leaved Forests are prone to fire caused by both natural and anthropogenic drivers. Thus, understanding fire drivers and their effect is important for the sustainable forest fire management. However, the preceding studies on forest specific fire drivers and their effect are limited. This research has identified the fire drivers and assessed their effect to fire occurrences in the Tropical Mixed Broad-leaved Forests of Nawalparasi District, Nepal. Fire drivers were identified and prioritized by participatory approaches. …

Life Cycle Assessment Of Ethiopian Cement Manufacturing: A Potential Improvement On The Use Of Fossil Fuel In Mugher Cement Factory, Lemma Beressa, Battula Vijaya Saradhi

Applied Environmental Research

The use of imported fuel in the Ethiopian cement industry increased the cost of production and the environmental burden, necessitating intervention. The greenhouse gas (GHG) emission, energy usage intensity, and resource exploitation of Ethiopian cement production were evaluated using the life cycle impact assessment (LCA) tool, aiming to recommend improvements. The LCA study used cumulative energy demand (CED) and Intergovernmental Panel on Climate Change (IPCC) 2006 life cycle impact assessment (LCIA) methods. For the case study of Mugher cement factory (MCF), the results on energy use intensities showed 3.74, 3.67, and 2.64 GJ/ton of clinker, Ordinary Portland cement (OPC), Pozzolana …

Enhanced Antimicrobial And Remineralizing Properties Of Self-Adhesive Orthodontic Resin Containing Mesoporous Bioactive Glass And Zwitterionic Material, Yong-Il Kim, Aerin Choi, Kyung-Hyeon Yoo, Seog-Young Yoon, Soo-Byung Park, Youn-Kyung Choi

Journal of Dental Sciences

Abstract Background/purpose Self-adhesive resins (SARs) do not require additional restorative adhesives and provide adequate adhesion to mineralized dental structures by shortening the bonding time in clinics where moisture control and isolation are difficult. The aim of this study was to evaluate the mechanical and biological properties of SARs containing mesoporous bioactive glass nanoparticles (MBNs) and 2-methacryloyloxyethyl phosphorylcholine (MPC) and to determine their antibacterial and remineralization effects. Materials and methods MBNs and MPC were added to SARs to improve their physical properties and remineralization ability. The experimental resins assessed in this study were SARs mixed with 3%MPC, 5%MPC, 1%MBN+3%MPC, or 3%MBN+3%MPC. …

The Antibacterial Activity Of Mineral Trioxide Aggregate Containing Calcium Fluoride, Miyoung Lim, Seunghoon Yoo

Journal of Dental Sciences

Abstract Background/purpose Because complete microbial elimination of the infected root canal system is nearly impossible to achieve, the use of root canal fillings with antibacterial effects may help to minimize intracanal infections. Our previous study, MTA modified by CaF2 addition, improved the biocompatibility and mineralization potential of human dental pulp cells without adverse effect on the physical properties. In this study, the antibacterial effect of MTA after CaF2 addition was evaluated for use as a root canal sealer. The objective of this study was to evaluate the antibacterial activity of MTA after the addition of CaF2. Materials and methods The …

กระบวนการตรวจพิสูจน์พยานหลักฐานดิจิทัล: การวิเคราะห์เพื่อพัฒนาเชิงนโยบาย, กานต์ ศรีสุวรรณ

Chulalongkorn University Theses and Dissertations (Chula ETD)

การวิจัยนี้ มีวัตถุประสงค์ในการนำเสนอขั้นตอนของกระบวนการตรวจพิสูจน์พยานหลักฐานดิจิทัลในประเทศไทย กฎหมายที่เกี่ยวข้อง ตลอดจนปัญหาและอุปสรรค เพื่อนำไปสู่ข้อเสนอเชิงนโยบายในการปรับปรุงกฎหมายและพัฒนากระบวนการตรวจพิสูจน์พยานหลักฐาน โดยเนื้อหาเกี่ยวกับลักษณะเฉพาะของพยานหลักฐานดิจิทัล กระบวนการตรวจพิสูจน์พยานหลักฐานดิจิทัล ประเด็นปัญหาและอุปสรรคจากผู้ที่เกี่ยวข้อง ข้อเสนอเชิงนโยบายและเชิงปฏิบัติ โดยใช้วิธีการวิจัยเชิงคุณภาพจากเอกสาร การลงพื้นที่สัมภาษณ์เชิงลึกและกรณีศึกษา จากการศึกษาพบว่า กระบวนการตรวจพิสูจน์พยานหลักฐานดิจิทัลในประเทศไทย 4 ขั้นตอน มีปัญหาและอุปสรรค คือ 1) การรวบรวมพยานหลักฐาน มีปัญหาในการรวบรวมพยานหลักฐานให้สมบูรณ์ขณะเกิดเหตุโดยไม่ถูกเปลี่ยนแปลงแก้ไข 2) การเก็บรักษาพยานหลักฐาน ไม่เป็นไปตามมาตรฐานการจัดเก็บ และการจัดการพยานหลักฐานดิจิทัล 3) การวิเคราะห์พยานหลักฐานดิจิทัล บุคลากรบางส่วนขาดความเชี่ยวชาญที่จำเป็นเฉพาะด้าน 4) การนำเสนอผลพิสูจน์พยานหลักฐานดิจิทัล มีการโต้แย้ง หรือขาดน้ำหนักในการรับฟังในชั้นพิจารณาคดี ข้อเสนอแนะจากการศึกษาครั้งนี้ คือ ควรมีการปรับปรุงพัฒนากระบวนการตรวจพิสูจน์พยานหลักฐานดิจิทัลในประเทศไทยให้มีมาตรฐานการปฏิบัติที่ชัดเจนในทั้ง 4 ขั้นตอนให้สอดคล้องกับมาตรฐานสากล บุคลากรควรได้รับการอบรมเพิ่มเติมในประเด็นความเชี่ยวชาญเฉพาะด้าน เพื่อช่วยลดปัญหาและอุปสรรคในการปฏิบัติงาน มีการแก้ไขกฎหมายที่เกี่ยวข้อง รวมถึงสนับสนุนให้มีการจัดตั้งสภาวิชาชีพนิติวิทยาศาสตร์ และจัดตั้งหน่วยงานเฉพาะที่ทำหน้าที่ในการกำกับดูแล โดยเริ่มต้นจากการส่งเสริมบทบาทของศูนย์ดิจิทัลฟอเรนสิกส์ที่มีอยู่เดิม เพื่อให้การป้องกันปราบปรามอาชญากรรมคอมพิวเตอร์ในประเทศไทยมีประสิทธิภาพมากขึ้น การวิจัยนี้ ได้รับการสนับสนุนทุนการศึกษาจากทุนการศึกษาหลักสูตรดุษฎีบัณฑิต “100 ปี จุฬาลงกรณ์มหาวิทยาลัย” (The 100th Anniversary Chulalongkorn University Fund for Doctoral Scholarship) และทุน 90 ปี จุฬาลงกรณ์มหาวิทยาลัย กองทุนรัชดาภิเษกสมโภช [The 90th Anniversary of Chulalongkorn University Fund (Ratchadaphiseksomphot Endowment Fund)]

Synthesis Of Zinc Sulfide Nanoparticles Using Microemulsion Generated By Hydrodynamic Cavitation Method, Nachapa Choojan

Chulalongkorn University Theses and Dissertations (Chula ETD)

Zinc Sulfite (ZnS) nanoparticles have attracted attention of researchers as a promising material for semiconductor fabrication. Their optical properties are strongly size-dependent and related to production methodology. A microemulsion technique is simple and requires less energy to produce ZnS nanoparticles. However, this technique usually results in ZnS with a wide size distribution. In this work, microemulsion technique and hydrodynamic cavitation have been effectively combined for synthesis of ZnS nanoparticles with controllable and uniform size distribution. The microemulsion system which consists of water, cyclohexane, hexanol and Triton X-100 surfactant has been prepared by incorporating hydrodynamic cavitation. Experimental results number of passages, …

High Water Vapor Permeability Ethylene-Vinyl Acetate Copolymer Composite For Fresh Holy Basil (Ocimum Sanctum L.) Packaging, Nuttinan Boonnao

Chulalongkorn University Theses and Dissertations (Chula ETD)

Fresh fruits and vegetables still respire, which causes large amount of water vapor inside the package. This results in the growth of fungal and bacterial pathogens and defection in the external appearance. To solve this problem, the packaging film with an appropriate value of gas permeability that matches the respiration rate of fresh fruits and vegetable products will be used. In this study, we produced EVA copolymer composite packaging films by melt blending EVA copolymer with diatomite and sorbitan monostearate additives and adjusted gas permeability which includes water vapor transmission rate (WVTR) and oxygen transmission rate (OTR) to be in …

The Prediction Of Pm2.5 Dispersion In Bangkok (Pathumwan District)Using Cfd Modeling, Punyisa Chaisri

Chulalongkorn University Theses and Dissertations (Chula ETD)

City configuration, meteorological conditions and emission source are the important factors affecting the concentration and dispersion of pollutants within urban street canyon. The dispersion of PM2.5 in Pathumwan district, Bangkok which has a characteristics of street canyon was predicted using a Computational Fluid Dynamics (CFD) model. Flow and dispersion of PM2.5 were analyzed using standard k-ε turbulence model. The concentrations of PM2.5 were investigated under different conditions to demonstrate the effect of city configuration in study area, meteorological characteristics, and lockdown due to COVID-19 on PM2.5 concentration. The numerical model was validated with the measured data from the air quality …

Mesoporous Carbon/Silica Nanocomposites With Acid And Base Properties For Glucose Conversion Into Value Added Chemicals, Satit Yousatit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The purpose of this study is to prepare mesoporous carbon/silica (MCS) nanocomposites using natural rubber (NR) as a renewable carbon source. A series of mesoporous nanocomposites based on NR and hexagonal mesoporous silica (HMS), prepared via an in situ sol-gel process, were used as precursors, which were then converted into the MCS materials by carbonization. The sulfonic acid-functionalized mesoporous carbon/silica (MCS-SO3H) was prepared by direct sulfonation with H2SO4 solution. The silica surface of MCS-SO3H were then grafted by 3-aminopropyltrimethoxysilane to produce the acid–base catalysts (MCS-SO3H-NH2) and used as the solid catalysts in glucose conversion. The MCS nanocomposites exhibited enhanced structural, …

Development Of Retention Index Based Simulation For Validation Of Compound Identification In Gc×Gc, Palathip Kakanopas

Chulalongkorn University Theses and Dissertations (Chula ETD)

Comprehensive two-dimensional gas chromatography (GC×GC) is a high-performance technique for separation, identification and quantification of volatiles and semi-volatiles in complex multi-component samples such as biomolecular molecules, essential oil, foods, and petroleum. One of the most popular detectors used for peak identification with GC×GC is mass spectrometer (MS) allowing identification of separated peaks based on comparison with mass spectral library. However, only MS library comparison shows low confidence in compound identifications due to the fact that compounds with similar structures (especially for isomers) often have similar mass spectra. Apart from sample preparation, a great challenge is to effectively select types of …

Effect Of Electric Field On Molecular And Electronic Structures Of Graphene With 4n-Divacancy Defect And Application On Hydrogen Gas Storage, Thanawit Kuamit

Chulalongkorn University Theses and Dissertations (Chula ETD)

The effect of external electric fields (EEFs) on geometries and electronic properties of graphene quantum dots (GQDs) and m-4N-divacancy defect GQDs (m-4N-GQDs) was studied using density functional theory (DFT) method with M06-2x functional and 6-31g (d) basis set. An external electric field with strength ranging from -0.035 to 0.035 atomic units (a.u.) was applied normal to the molecular plane. Three different sizes, i.e., C24H12, C54H18, and C96H24, were investigated. The metal doping in m-4N-GQDs consists of Ca, Ca2+, Cr, Cr2+, Fe, and Fe2+. Our results revealed that GQDs and m-4N-GQDs are curved under EEFs in the direction opposite to the …

Impact Of Early Childhood Caries On Oral Health-Related Quality Of Life Among 5-Year-Old Children In Mandalay, Myanmar, Saw Nay Min

Chulalongkorn University Theses and Dissertations (Chula ETD)

Purpose: The study aimed to develop the cross-cultural adaptation and psychometric properties of the Myanmar Version of SOHO-5 and assess the impact of ECC on oral health quality of life among 5-year-old children in Mandalay using the Myanmar version of the SOHO-5 questionnaire. Materials and methods: The Myanmar SOHO-5 version was conducted with the forward-backward translation method and investigated the content validity, internal consistency, test-retest reliability, construct validity, and discriminant validity on 5-year-old children and their parents in phase I. A cross-sectional study was conducted using a self-administered questionnaire to investigate the impact of ECC and relative factors on the …

Deployment Of Rfid, Gps And Iot Technology For Medical Specimen Logistic System, Mya Myet Thwe Chit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This paper aims to implement a specimen logistic system using RFID technology combined with modern IoT technology in Chulalongkorn hospital. The specimen is a sample collected from the human body. Samples can be urine, saliva, sputum, feces, semen, and other bodily fluids and tissues. Samples are usually collected from the patient and stored in a test tube. Then test tubes are delivered to the corresponding laboratory for examination. Normally, barcodes are tagged over the test tubes for the purpose of recording patient information. In this work, RFID is deployed on the test tube instead for patient data logging. This solution …