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Solving Multi-Depot Open Pickup And Delivery Problem With Capacity And Distance Restrictions By Ant Colony Optimization Algorithm, Teerawat Indravattana
Solving Multi-Depot Open Pickup And Delivery Problem With Capacity And Distance Restrictions By Ant Colony Optimization Algorithm, Teerawat Indravattana
Chulalongkorn University Theses and Dissertations (Chula ETD)
The recently occurring global pandemic caused the mobile delivery service business to grow rapidly. One of the important aspects of this issue is the problem of finding the route of the company’s couriers to reduce the cost of the operation and increase the total gain. This study aims to find a route that has the least cost while the couriers do not carry the packages over their capacity limits or exceed the maximum distance they can travel, and all requests are satisfied. The problem was defined as a Distance-constrained Multi Depot Open Pickup and Delivery Problem (DMDOPDP). A program simulating …
Ph Modulation Of Arsenic Phytoextraction And Nutrient Uptake In Water Hyacinth (Eichhornia Crassipes (Mart.)), Hein Htet Aung
Ph Modulation Of Arsenic Phytoextraction And Nutrient Uptake In Water Hyacinth (Eichhornia Crassipes (Mart.)), Hein Htet Aung
Chulalongkorn University Theses and Dissertations (Chula ETD)
Arsenic contamination in water area poses significant threats to ecosystems as well as human health around the world. For reducing the rate of arsenic pollution, phytoremediation, which applies plant-based systems, could provide a long-term solution. A hyper-accumulating plant, water hyacinth (Eichhornia crassipes), which is known for its rapid growth and efficient nutrient uptake, has emerged as an attractive candidate for arsenic phytoextraction. However, the efficiency of arsenic removal by water hyacinth could be affected by a variety of environmental factors, including various ranges of pH in aquatic environments. This study investigates the effect of pH modulation on arsenic phytoextraction efficiency …
Integrated Data Analysis, Neural Network Modeling, And Model-Based Control System For Biomass Gasification Processes, Kritsana Suwanamad
Integrated Data Analysis, Neural Network Modeling, And Model-Based Control System For Biomass Gasification Processes, Kritsana Suwanamad
Chulalongkorn University Theses and Dissertations (Chula ETD)
In the face of a global crisis including the problem of global warming and air pollution (PM 2.5). Renewable energy sources are gaining much attention, especially the biomass gasification process because in agricultural countries there is a lot of biomass waste incorrect management of waste biomass results in increased environmental problems. In addition, the gasification process from biomass has a low cost, the operation is simple and it can also synthesize syngas which can be used for many applications such as being a precursor to producing chemicals, fuels, electricity, and many more. Therefore, this research focuses on developing the gasification …
The Effects Of Lanthanide Metals Dopants (M = La, Ce และ Y) On The Stability Of M-V2o5/Tio2 Catalyst During Selective Oxidation Of H2s In Biogas To Elemental Sulfur, Galayanee Prathumthom
The Effects Of Lanthanide Metals Dopants (M = La, Ce และ Y) On The Stability Of M-V2o5/Tio2 Catalyst During Selective Oxidation Of H2s In Biogas To Elemental Sulfur, Galayanee Prathumthom
Chulalongkorn University Theses and Dissertations (Chula ETD)
In the biogas industry, the selective oxidation of hydrogen sulfide is an important process to transform hydrogen sulfide into elemental sulfur. In this study, the vanadium (V) oxide on titania catalyst is used to add lanthanide metal dopants, specifically lanthanum , cerium , and yttrium, to make the catalyst more active and stable. The catalysts, both undoped and doped, are prepared via wet impregnation methods with a 3% loading of vanadium oxide. Oxygen vacancy and metal-support interactions significantly enhance activity and stability. The characterization, such as Hydrogen-temperature programmed reduction and X-ray photoelectron spectroscopy, is used to elucidate these characteristics. The …
Numerical Modeling Of Reinforced Concrete Columns With Expanded Metal Mesh Ferrocement Under Constant Axial Load And Cyclic Lateral Loading, Khin Khin Moe
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research develops the numerical models of the unstrengthened and strengthened columns with an expanded metal mesh ferrocement jacket under constant axial load and cyclic lateral loading. The experimental data from two control and six strengthened columns validate the numerical model using nonlinear finite element analysis in OpenSees. The primary objective of this research is to model the seismic behavior of unstrengthened and ferrocement-strengthened reinforced concrete columns in OpenSees, considering two longitudinal steel ratios, two ferrocement jacket thicknesses, and the presence of two sizes of externally anchored longitudinal steel. The fiber-based displacement beam-column element was used. Each fiber section discretizes …
Technical Feasibility Studies Of The Microgrid Pilot Project At Rubesa In Bhutan., Karma Chheki
Technical Feasibility Studies Of The Microgrid Pilot Project At Rubesa In Bhutan., Karma Chheki
Chulalongkorn University Theses and Dissertations (Chula ETD)
Over the years, Microgrid integration of hybrid renewable resources has emerged as a game-changing solution, significantly enhancing resilience and sustainability in the global energy landscape. This thesis introduces both isolated and grid-connected microgrid designs tailored to the context of Rubesa, a local community in the western part of Bhutan called Wangduephodrang district. Drawing upon hybrid solar and hydro resources to serve the local demand, the study emphasizes a Technical Feasibility Study of a Resilience-Oriented Utility Microgrid Pilot Project using the Hybrid Optimization Multiple Energy Resources (HOMER Pro) software. Test results demonstrate that a diversified mix of renewable energy sources of …
Fast Panoptic Segmentation On Urban Street Scenes, Chananvich Plabplathong
Fast Panoptic Segmentation On Urban Street Scenes, Chananvich Plabplathong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Panoptic segmentation, which unifies semantic and instance segmentation, offers a comprehensive understanding of images for a variety of applications. Real-time performance with high accuracy is challenging. Recent panoptic segmentation models operate in real-time, but they often suffer from low accuracy in comparison to existing benchmarks. The objective of this thesis is to improve the performance of the "You Only Segment Once" (YOSO) model, which is the fastest panoptic segmentation model. Our model, C-YOSO, combines YOSO and a contrastive loss concept. In order to enhance the inference speed, the query decoder is simplified by incorporating a lightweight image-based query decoder that …
Characterizing Aerosol Size Distribution In An Urban Park: A Case Study Of Chulalongkorn University Centenary Park In Bangkok, Thailand, Zwe Htet Aung
Characterizing Aerosol Size Distribution In An Urban Park: A Case Study Of Chulalongkorn University Centenary Park In Bangkok, Thailand, Zwe Htet Aung
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigated the particle number size distribution (PNSD) in the Chulalongkorn University Centenary Park, an urban park in Bangkok. Two 7-day continuous measurements were conducted during February to March 2023 which is in the high PM2.5 pollution season of Bangkok. The measurement employed the Scanning Mobility Particle Sizer (SMPS) and the Optical Particle Sizer (OPS) to measure in the range of 10 – 10,000 nm. Measurement of PM2.5 and PM10 along with environmental parameters were brought into the analysis. The study characterized the particle number concentration levels and size distribution in relation to particle mass concentration and other environmental …
Techno-Economic Analysis Of Bioethylene Production From Bioethanol, Napat Praphantwong
Techno-Economic Analysis Of Bioethylene Production From Bioethanol, Napat Praphantwong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Ethylene is one of the largest petrochemical products produced from various feedstock such as ethane, propane, butanes, naphtha and gas oil. The conventional method for producing ethylene is the steam-cracking process by which hydrocarbons are broken down through refining petroleum or natural gas. Since the main feedstock of conventional ethylene production is non-renewable, alternative feedstock, such as biomass is introduced to produce bioethylene. Dehydration of bioethanol into bioethylene has been studied herein. Bioethanol can be produced through fermentation process using agricultural products, the main industries in Thailand. Catalytic dehydration of anhydrous bioethanol on Ru-HBZ catalyst is selected in this work …
Automatic Reconstruction Of Skull Implants Using Deep Learning Approach, Thatchapatt Kesornsri
Automatic Reconstruction Of Skull Implants Using Deep Learning Approach, Thatchapatt Kesornsri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Skull reconstruction is the process of designing and manufacturing implants for defective skulls. It is an important step in the process of cranioplasty, which is the surgical repair of skull defects or deformities. Cranioplasty is frequently required following traumatic brain injuries, tumor removals, or other neurosurgical procedures that involve the removal of a portion of the skull. Traditional methods of implant design frequently involve manual 3D modeling, which can be complicated, time-consuming, and susceptible to human error. Automated implant design techniques, on the other hand, use advanced imaging technologies and deep learning to automatically generate customized implants. Recent skull reconstruction …
Numerical Modeling Of Reinforced Concrete Columns Strengthened By External Steel Collars And Steel Bars, Thin Zar Win
Numerical Modeling Of Reinforced Concrete Columns Strengthened By External Steel Collars And Steel Bars, Thin Zar Win
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study investigated numerical modeling for reinforced concrete columns strengthened by external hollow structural section (HSS) steel collars and external steel bars. The main objective of this study is to numerically assess the seismic performance of columns strengthened by external steel collars and external steel bars. The experimental test data of two control columns, four steel-collar-strengthened RC columns with external steel bars, performed by Panyakapo et.al. (2024), were taken as benchmarks for the validation of numerical analysis. The implementation of finite element models for RC columns was performed in the OpenSees program. The fiber-based displacement nonlinear beam-column element was used …
A Channel And Spatial Attention Feature Extraction Method For Remote Sensing Image Super-Resolution Using Vision Transformer, Naveed Sultan
A Channel And Spatial Attention Feature Extraction Method For Remote Sensing Image Super-Resolution Using Vision Transformer, Naveed Sultan
Chulalongkorn University Theses and Dissertations (Chula ETD)
In recent years, convolution neural networks have achieved a remarkable advancement in remote sensing image super-resolution due to the complexity and variability of textures and structure. Current deep learning-based super-resolution models concentrate less on high-frequency features, which leads to suboptimal performance in capturing contours, texture, and spatial information. State-of-the-art deep learning methods now focus on feature extraction of remote sensing images using attention mechanisms. However, these methods are still incapable of effectively identifying and utilizing key content attention. The existing transformer models do not focus on capturing the spatial information in their encoder and decoder parts. To cover these problems, …
Techno-Economic Evaluation Of Co2-To-Methanol (Ctm) Processes Using Multi-Stage Adiabatic Reactors And Single-Stage Isothermal Operations, Pratchaya Lertprasert
Techno-Economic Evaluation Of Co2-To-Methanol (Ctm) Processes Using Multi-Stage Adiabatic Reactors And Single-Stage Isothermal Operations, Pratchaya Lertprasert
Chulalongkorn University Theses and Dissertations (Chula ETD)
Climate change is driven by CO2 emissions that poses significant environmental challenges. Carbon Capture and Utilization (CCU) offers a solution by converting CO2 into valuable products. One promising approach is methanol production, where CO2 and hydrogen react to form methanol. In this research, CO2-to-methanol process was simulated by using Aspen Plus software. CO2 source is captured from flue gas emitted at power plant with capacity 5,267,687.04 tonne/year and H2 source is obtained from proton-exchanger water electrolysis. Feed preparation by heated to 200°C, 220°C, 240°C, and 260 °C and 50, 60, 70 and 80 bar of pressure fed to a reactor …
เอไอสำหรับการแนะนำรหัสบัญชีสมุดแยกประเภททั่วไป, ปกรณ์ โคตรภูชัย
เอไอสำหรับการแนะนำรหัสบัญชีสมุดแยกประเภททั่วไป, ปกรณ์ โคตรภูชัย
Chulalongkorn University Theses and Dissertations (Chula ETD)
เทคโนโลยีเอไอช่วยส่งเสริมให้ธุรกิจสามารถคงความเป็นคู่แข่งที่แข็งแกร่งในโลกปัจจุบันที่มีการแข่งขันสูง ขณะเดียวกันการทำบัญชีก็มีบทบาทสำคัญที่ทำให้การบริหารการเงินของธุรกิจประสบความสำเร็จ การทำบัญชีเกี่ยวข้องกับการบันทึกธุรกรรมทางการเงินที่เกิดขึ้น และเลือกรหัสบัญชีที่ถูกต้องในการบันทึกบัญชี การใส่ค่ารหัสบัญชีด้วยมืออาจก่อให้เกิดความผิดพลาดและสูญเสียทรัพยากรของบริษัท ขณะที่การใส่ค่ารหัสบัญชีที่ถูกต้องเป็นสิ่งสำคัญที่ช่วยให้การตัดสินใจทางธุรกิจดียิ่งชึ้นและทำให้ธุรกิจเติบโตได้อย่างรวดเร็ว การแนะนำรหัสบัญชีอัตโนมัติด้วยเอไอสามารถช่วยประหยัดเวลา เพิ่มผลิตภาพและคุณภาพของผลลัพธ์ จากการลดความผิดพลาดของมนุษย์ งานวิจัยนี้จึงนำเสนอแนวทางระบบที่พัฒนาด้วยเอไอเพื่อแนะนำรหัสบัญชีในการทำบัญชีแบบรายการคู่ การประมวลผลภาษาธรรมชาติถูกนำมาใช้เป็นหลักในขั้นตอนการเตรียมข้อมูลเพื่อให้คอมพิวเตอร์สามารถประมวลผล และดึงความหมายจากข้อมูลที่เป็นข้อความได้ แบบจำลองการเรียนรู้ของเครื่องได้ถูกสร้างขึ้นจากอัลกอริทึม คาร์ต, ป่าสุ่ม, และมัลติเลเยอร์ เพอร์เซปทรอน ผลการทดลองรายงานว่าแบบจำลองป่าสุ่มที่ใช้วิธีแทนค่าข้อความด้วยวิธีถุงคำ ให้ค่าความแม่นยำสูงสุดที่ 84.91% ซึ่งอยู่ในระดับที่ยอมรับได้ในมุมของการบัญชี
Modified Indion 225 H Ion-Exchange Resin For Acetylation From Glycerol With Acetic Acid, Pakin Sopolapikul
Modified Indion 225 H Ion-Exchange Resin For Acetylation From Glycerol With Acetic Acid, Pakin Sopolapikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Acetin is a high-value product derived from the esterification of glycerol and acetic acid. The global demand of acetin is increasing as it is a useful chemical for various industries. However, current catalysts are quite expensive and require complicated production steps. Therefore, exploring alternative catalysts for more efficient and cheaper production is essential. One such alternative catalyst is Indion 225 H resin, which is suitable for acetin production. This research studies the efficiency of this catalyst at different temperatures and various catalyst amounts (1-7%) in both a batch system and an azeotropic distillation system to enhance reaction efficiency. Additionally, it …
Heterogeneous Capacitated Vehicle Routing By Particle Swarm Optimization, Ye Kyaw
Heterogeneous Capacitated Vehicle Routing By Particle Swarm Optimization, Ye Kyaw
Chulalongkorn University Theses and Dissertations (Chula ETD)
In logistics and transportation sector, heterogenous fixed fleet vehicle routing problem, where there are different types of vehicles and a limited number of vehicles of each type with varying capacities, poses a significant challenge. The primary objective of this study is to minimize the total cost associated with factors such as fuel consumption and distance travelled. The problem is defined as Heterogeneous Fixed Fleet Vehicle Routing Problem with Distance and Capacity Limit. The PSO algorithm will be customized to handle the heterogeneity of the vehicle fleet efficiently, while taking different vehicle capacities and fuel efficiencies into consideration. Substantial computational experiments …
A Comparative Study On Electrical Characteristics Of Suspension Insulators, Lyhour You
A Comparative Study On Electrical Characteristics Of Suspension Insulators, Lyhour You
Chulalongkorn University Theses and Dissertations (Chula ETD)
Throughout the service life, suspension insulators may sustain damage from a variety of sources. It's crucial to select suspension insulators with appropriate electrical performance. It is anticipated that physical attributes such as forms and sizes will have a significant impact on electrical properties. In order to examine the relationship between electrical performance and physical dimensions, suspension insulators are tested and the findings are examined. Suspension insulators are subjected to dimensional measurements, dry and wet flashovers, leakage current measurement, critical impulse flashovers (CFO), radio influence voltage (RIV), and dissipation factor measurement. Then the correlation coefficients between each parameter pair are determined. …
Design And Fabrication Of An Anthropomorphic Robotic Finger With Dual Tendon Drives And Passive Stretch-Driven Elastic Members, Worathris Chungsangsatiporn
Design And Fabrication Of An Anthropomorphic Robotic Finger With Dual Tendon Drives And Passive Stretch-Driven Elastic Members, Worathris Chungsangsatiporn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Human hands are unparalleled in their dexterity, precision, and versatility, making them ideal models for robotic systems. Conventional robotic hands with standard joints cannot fully replicate human hand biomechanics, often resulting in increased weight, cost, and complexity. The primary objective is to develop a robotic finger that closely mimics anthropomorphic characteristics using computer-aided design (CAD) and rapid prototyping technology and to analyze its force and motion behaviors. The underactuated hybrid design combined soft and rigid elements and emphasizes passive adaptability to achieve dexterity. Rolling contact joints were applied to replicate varied rotational axis biomechanics. Springs and tendon routes were integrated …
Effects Of Preparation Method For Titania On Silica Support On Catalyst Stability For Methyl Oleate Epoxidation, Warinya Sukkaew
Effects Of Preparation Method For Titania On Silica Support On Catalyst Stability For Methyl Oleate Epoxidation, Warinya Sukkaew
Chulalongkorn University Theses and Dissertations (Chula ETD)
Biomass is an outstanding raw material instead of fossil fuel because of its renewable and eco-friendly nature. In Southeast Asia in particular, there is an oversupply of palm oil. Converting palm oil into high-value products presents a promising solution. The major composition derived from palm oil is methyl oleate. Methyl oleate can be converted to epoxide product that is used in a broad application in the chemical industry through epoxidation. Ti-based catalyst is a promising candidate catalysts for epoxidation reactions. This work focuses on the epoxidation reaction of methyl oleate with hydrogen peroxide. For Ti-based catalysts, support is essential. The …
Sustainable Brick Comprising Recycled Granite Particle Waste And Hemp Shiv, Wai Lin Phyo
Sustainable Brick Comprising Recycled Granite Particle Waste And Hemp Shiv, Wai Lin Phyo
Chulalongkorn University Theses and Dissertations (Chula ETD)
Products are responsible to fabricate using few natural resources and regenerating less waste in manufacturing according to eco-efficient concept reported by the World Business Council for Sustainable Development (WBCSD) in 1991. As a consequence, reutilization of wastes from other production chains has been substantially increasing in brick production to contribute a more sustainable construction product. This study investigates the brick samples made the mixtures of recycled granite particle wastes and potential replacement of hemp shivs (10%, 20% and 30%), together with a few amounts of cement (around 11% by mass) by using clean energy production technique. Two brick specimens of …
The Role Of Pedot-Encapsulated Mno2 For Performance Enhancement Of Zinc-Ion Battery Cathodes, Wichuda Silapasom
The Role Of Pedot-Encapsulated Mno2 For Performance Enhancement Of Zinc-Ion Battery Cathodes, Wichuda Silapasom
Chulalongkorn University Theses and Dissertations (Chula ETD)
Zinc-ion batteries are increasingly recognized as a sustainable and eco-friendly alternative to conventional lithium-ion battery technologies. Among the various cathode materials, manganese dioxide (MnO2), particularly the layered-type δ-MnO2, exhibits significant potential due to its advantageous structure for Zn2+ intercalation. However, the use of aqueous electrolytes in these systems poses challenges, including capacity fading after repeated charge/discharge cycles. Poly(3,4-ethylenedioxythiophene) (PEDOT), an electrically conductive polymer, is known for its properties that enhance Zn2+ ion mobility. In this study, PEDOT-encapsulated δ-MnO2 was synthesized via a hydrothermal method for application as a cathode material in zinc-ion batteries utilizing nonaqueous electrolytes. Advanced characterization techniques, notably …
Development Of A Vr-Based System For Detecting Strabismus In Patients With Refractive Errors, Salisa Buapong
Development Of A Vr-Based System For Detecting Strabismus In Patients With Refractive Errors, Salisa Buapong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Strabismus is an ophthalmic condition affecting approximately 2% to 5% of the global population, with a pediatric prevalence rate of about 2% to 4%. If left uncorrected and untreated for an extended period, it can lead to impairment of binocular vision and eventual vision loss. Thus, early detection and correction of ocular deviations are crucial in mitigating these risks. However, primary clinical tests, such as the Alternate Prism Cover Test (APCT) and the Hirschberg Test (HT), have several limitations. These include reliance on operator skills and experience, prolonged examination time, and an unbalanced range of prism diopters. Furthermore, previous studies …
Characterizing Size-Resolved Chemical Composition And Source Contributions Of Particulate Matter In The Bangkok Metropolitan Region By Geos-Chem Model, Si Thu Kyaw
Chulalongkorn University Theses and Dissertations (Chula ETD)
The GEOS-Chem chemistry-transport model with 15-bins microphysics scheme (TOMAS15) is used to determine the size-resolved chemical compositions of particulate matter and evaluate the aerosol number and mass size distributions over the Bangkok Metropolitan Region (BMR) during the year 2021. The predicted maximum 24-hour aerosol concentration over the nested grid domain during dry season reaches approximately 3 x 107 cm-3, whereas during the wet season, the maximum concentration is 1.7 x 107 cm-3. Over the BMR, the total aerosol number concentration of dry season is higher than that of the wet season with 14.8 x 106 cm-3 and 9.2 x 106 …
Effect Of Brønsted And Lewis Acid On Ni-Based Bifunction Catalyst On Hydroprocessing Of Palm Oil To Biojet Fuel, Settapong Kantangkul
Effect Of Brønsted And Lewis Acid On Ni-Based Bifunction Catalyst On Hydroprocessing Of Palm Oil To Biojet Fuel, Settapong Kantangkul
Chulalongkorn University Theses and Dissertations (Chula ETD)
Jet fuels are mainly generated by refining petroleum feedstock, resulting in the emission of greenhouse gases. Therefore, biojet fuel is proposed as an alternative solution for solving this issue. Hydroprocessing of vegetable oils is an efficient pathway for producing biojet fuel. This process includes three reaction which are hydrodeoxygenation, hydrocracking and hydroisomerization over metal-acid catalyst. Biojet fuel series ranging from C8 to C16 must have a freezing point around -47 °C or lower, requiring the use of iso-paraffins which have low freezing points. There are challenges in improving the quantity and quality of biojet fuel production. This study aims to …
Battery Sales Forecasting Using Traditional Forecasting And Machine Learning Techniques, Santi Wongkamphu
Battery Sales Forecasting Using Traditional Forecasting And Machine Learning Techniques, Santi Wongkamphu
Chulalongkorn University Theses and Dissertations (Chula ETD)
Battery sales forecasting is crucial for demand planning in the automotive battery industry. This objective of this study is to identify traditional forecasting methods and machine learning techniques to predict monthly sales for a case-study battery manufacturer in Thailand. The monthly sales data of the 10-best-selling products are from January 2018 to December 2023. Traditional forecasting models considered in this research are Holt’s Linear Trend, Holt-Winters Seasonal, Autoregressive Integrated Moving Average (ARIMA), Seasonal ARIMA (SARIMA) and SARIMA with Exogenous Variables (SARIMAX). The machine learning approaches are Long Short-Term Memory (LSTM) and Artificial Neural Networks (ANN). Hybrid models integrating both traditional …
Multi-Modal Deep Learning For Diagnosis Of Dyssynergic Defecation Using Abdominal X-Ray Images And Symptom Questionnaires, Sirapob Sangnark
Multi-Modal Deep Learning For Diagnosis Of Dyssynergic Defecation Using Abdominal X-Ray Images And Symptom Questionnaires, Sirapob Sangnark
Chulalongkorn University Theses and Dissertations (Chula ETD)
Dyssynergic defecation (DD) is a specific type of chronic constipation necessitating a specialized diagnostic test. However, these tests are exclusively available in tertiary care settings due to the unavailability of the required devices in primary and secondary care settings. In this thesis, we present a multi-modal deep learning model that can preliminary diagnose patients who suffer from DD. This model utilizes cost-effective and accessible data in small hospitals, such as abdominal X-ray images and symptom questionnaires. Cross-modal attention is applied to assist the multi-modal model in identifying significant relationships between the two types of data. A convolution block attention module …
Effect Of Co-Existing Parameters On The Adsorption Of Perfluorooctanoic Acid (Pfoa) On Powdered Activated Charcoal, Aung Thit Htun
Effect Of Co-Existing Parameters On The Adsorption Of Perfluorooctanoic Acid (Pfoa) On Powdered Activated Charcoal, Aung Thit Htun
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this study the adsorption of PFOA on three different commercial Powdered Activated Charcoal (PACs), wood-based, bamboo-based and coconut-shell-based activated charcoals, was explored. The influence of PACs characteristics on adsorption has been evaluated and the presence of oxygen containing functional groups significantly affect the adsorption mechanism. The adsorption equilibrium of PFOA, the initial concentration of 1 mg/L was achieved in 2 hours by the doses of 1.2 g/L of PACs. The effect of pH, adsorbent types, hardness ions and temperature in adsorption efficiency of PAC was investigated by batch experiments. The results of adsorption kinetic showed that PFOA adsorption on …
Characterizing Particle Number Size Distributions And Source Contribution For Public Elementary School Classrooms In Bangkok, Hnin Phyu Phyu Aung
Characterizing Particle Number Size Distributions And Source Contribution For Public Elementary School Classrooms In Bangkok, Hnin Phyu Phyu Aung
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study characterizes particle number size distributions (PNSD) and source contributions for public elementary school classrooms in Bangkok. Using Scanning Mobility Particle Sizers (SMPS) and Optical Particle Sizers (OPS), measurements covered particle sizes from 10 nm to 10 µm during regular school hours on weekdays and under various experimental conditions on weekends. The particle number concentrations (PNC) showed significant fluctuations for all four schools with peak levels observed during morning rush hours coinciding with students' arrival and indoor activities. The findings revealed predominant Aitken mode particles both indoors and outdoors. During weekdays, the PNSD was significantly unimodal, with sigma (σ) …
Silk Fibroin-Platelet Rich Plasma Injectable Hydrogel With Controlled-Release Of Growth Factors For Knee Osteoarthritis, Suvinai Jiraboonsri
Silk Fibroin-Platelet Rich Plasma Injectable Hydrogel With Controlled-Release Of Growth Factors For Knee Osteoarthritis, Suvinai Jiraboonsri
Chulalongkorn University Theses and Dissertations (Chula ETD)
Currently, there is no treatment that can stop the progression of osteoarthritis (OA). Platelet Rich Plasma (PRP) is a promising therapy. However, significant challenges remain for the effective use of PRP in OA treatment, namely its burst-like release of growth factors and its short-acting time due to rapid synovial clearance. Silk fibroin is a safe biomaterial for drug delivery system. Therefore, in this study, Silk-Fibroin-Platelet-Rich Plasma injectable hydrogels with the ability to controllably release growth factors were developed and characterised. Two silk fibroin-platelet-rich-plasma (SF-PRP) hydrogel with silk fibroin concentrations of 1% w/v (1% SF-PRP) and 2% w/v (2% SF-PRP) were …
Exploring Job Burnout And Engagement Amongst Construction Managers In Thailand: A Cross-Sectional Study Using Structural Equation Modelling, Thinley Lhendup
Exploring Job Burnout And Engagement Amongst Construction Managers In Thailand: A Cross-Sectional Study Using Structural Equation Modelling, Thinley Lhendup
Chulalongkorn University Theses and Dissertations (Chula ETD)
Studies of job burnout have gained appreciable momentum within the construction industry in the past few decades, however literature incorporating the Maslach Burnout Inventory (MBI) is still sparse. Furthermore, a single piece of literature can be traced that utilized the six Areas of Worklife Survey (AWS) as an independent variable influencing burnout among construction professionals. This study proposed a hypothetical model in which Areas of Worklife potentially contribute to Job Burnout/Engagement among construction professionals in Thailand and explored the consequential relationships between perceived Job Performance and Turnover Intentions. Cross-Sectional data was explored using an online questionnaire survey, and Structural Equation …