ผลกระทบของวิธีการสร้างภาพเอกซเรย์ต่อความถูกต้องของ ค่าความหนาแน่นอิเล็กตรอนและเลขอะตอมยังผลจาก เครื่องเอกซเรย์คอมพิวเตอร์จำลองการรักษาแบบสองพลังงาน,
2023
คณะวิศวกรรมศาสตร์
ผลกระทบของวิธีการสร้างภาพเอกซเรย์ต่อความถูกต้องของ ค่าความหนาแน่นอิเล็กตรอนและเลขอะตอมยังผลจาก เครื่องเอกซเรย์คอมพิวเตอร์จำลองการรักษาแบบสองพลังงาน, เกตุนภาพร เกตุประดิษฐ์
Chulalongkorn University Theses and Dissertations (Chula ETD)
ในระยะไม่กี่ปีที่ผ่านมา มีการพัฒนาเครื่องเอกซเรย์คอมพิวเตอร์ในหลายรูปแบบ หนึ่งในนั้นได้แก่เครื่องเอกซเรย์คอมพิวเตอร์แบบสองพลังงาน (Dual-Energy Computed Tomography) ซึ่งมีความแม่นยำในการประมาณค่าความหนาแน่นอิเล็กตรอนและค่าเลขอะตอมยังผล ทั้งสองค่านี้มีความสำคัญในด้านรังสีรักษาเป็นส่วนบ่งบอกคุณลักษณะของเนื้อเยื่อ งานวิจัยนี้มีจุดประสงค์เพื่อศึกษาความถูกต้องของการคำนวณค่าความหนาแน่นอิเล็กตรอนและค่าเลขอะตอมยังผลจากภาพที่ประมวลผลด้วย Iterative reconstruction algorithm วิธีการทดลอง ขั้นตอนแรกจะสร้างหุ่นจำลองดิจิตอลโดยใช้โปรแกรม MATLAB R2021a อ้างอิงลักษณะเนื้อเยื่อจากหุ่นจำลอง GAMMEX 467 โดยมีประเภทเนื้อเยื่อดังต่อไปนี้ เนื้อเยื่อกระดูกชนิดเนื้อแน่น (Cortical bone) เนื้อเยื่อสมอง (Brain) เนื้อเยื่อไขมัน (Adipose) และเนื้อเยื่อเต้านม (Breast) ขั้นตอนที่สองสร้างซิโนแกรม (sinogram) โดยจำลองพลังงานของรังสีเอกซ์จากเครื่องเอกซเรย์คอมพิวเตอร์แบบสองพลังงานที่พลังงาน 80 และ 140 kVp โดยใช้ SPEKTR 3.0 MATLAB Toolbox ให้พลังงานทั้งสองผ่านหุ่นจำลองดิจิตอลที่สร้างขึ้นมา เก็บมุมของภาพทั้งหมด 180 มุม ขั้นตอนที่สามเพิ่มสัญญาณรบกวนลงในภาพซิโนแกรมโดยตั้งค่าการกระจายสัญญาณรบกวน 3 ระดับได้แก่ 2, 5 และ 10 ขั้นตอนที่สี่ทำการประมวลผลสร้างภาพตัดขวางจากภาพซิโนแกรมที่ไม่มีสัญญาณรบกวนและมีสัญญาณรบกวนในระดับต่างๆ ด้วยวิธีการฉายภาพย้อนกลับแบบกรอง (Filtered back projection) และวิธีการวนซํ้า (iterative algorithm) โดยใช้ TIGRE Toolbox แล้วคำนวณหาค่าความหนาแน่นอิเล็กตรอนและค่าเลขอะตอมยังผลจากภาพที่ประมวลผลได้โดยใช้สมการ DEEDZ ผลการวิจัยพบว่าวิธีการประมวลผลแบบวิธีการวนซํ้า ให้ค่าความหนาแน่นอิเล็กตรอนจากภาพซิโนแกรมที่ไม่มีสัญญาณรบกวนและที่มีสัญญาณรบกวนในระดับต่างๆในเนื้อเยื่อทุกประเภทดีกว่าวิธีการฉายภาพย้อนกลับแบบกรอง ยกเว้น ภาพซิโนแกรมที่ไม่มีสัญญาณรบกวนในเนื้อเยื่อกระดูกชนิดเนื้อแน่นเมื่อเปรียบเทียบกับค่าความหนาแน่นอิเล็กตรอนมาตรฐาน ผลการวิจัยในส่วนค่าเลขอะตอมยังผลพบว่าวิธีการประมวลผลแบบวิธีการวนซํ้าให้ค่าเลขอะตอมยังผลจากภาพซิโนแกรมที่ไม่มีสัญญาณรบกวนและที่มีสัญญาณรบกวนในระดับต่างๆในเนื้อเยื่อทุกประเภทดีกว่าวิธีการฉายภาพย้อนกลับแบบกรองเมื่อเปรียบเทียบกับค่าเลขอะตอมยังผลมาตรฐาน
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province.,
2023
Faculty of Science
Structural Evolution Of The Phu Kradung Formation By Calcite Veins Characterization, South Of Lam Sonthi District, Lopburi Province., Ausa Nonthason
Chulalongkorn University Theses and Dissertations (Chula ETD)
Calcite veins in Mesozoic sedimentary rock localities are found in the southern part of Lam Sonthi district, Lopburi province, in central Thailand, near the Loei-Petchabun fold belt regions. The vein’s host rocks are siliciclastic rocks, primarily mudstone and sandstone. The main aim of this study is to learn more about calcite vein geometry and development, as well as the structural evolution of calcite veins in the Phu Kradung formation in the Lam Sonthi area of Lopburi province. A petrographic and structural analysis of the veins was performed to examine the kinematics and geological structures of the calcite vein in the …
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area,
2023
Faculty of Science
Geophysical Characteristics Of Kuan Kreng Peat Swamp Forest At Thale Noi Area, Theethach Phiranram
Chulalongkorn University Theses and Dissertations (Chula ETD)
Peatlands, as an important carbon sink, store a large amount of atmospheric carbon. However, peatlands are vulnerable to environmental alteration due to anthropogenic and natural processes. While peatlands are degraded, carbon dioxide emissions arise. The Kuan Kreng peat swamp forest is the second largest peatland in Thailand and is in coastal wetland serving for carbon stock in the subsurface. To assess carbon stock in peatland, the thickness and distribution of the peat layer are necessary. This study determines physical and chemical characteristics of the peatlands in the coastal wetland, southern Thailand by conventional core study and geophysical surveys, including ground …
Application Of Distributed Fiber-Optic Sensing For Pressure Predictions And Multiphase Flow Characterization,
2022
Louisiana State University and Agricultural and Mechanical College
Application Of Distributed Fiber-Optic Sensing For Pressure Predictions And Multiphase Flow Characterization, Gerald Kelechi Ekechukwu
LSU Doctoral Dissertations
In the oil and gas industry, distributed fiber optics sensing (DFOS) has the potential to revolutionize well and reservoir surveillance applications. Using fiber optic sensors is becoming increasingly common because of its chemically passive and non-magnetic interference properties, the possibility of flexible installations that could be behind the casing, on the tubing, or run on wireline, as well as the potential for densely distributed measurements along the entire length of the fiber. The main objectives of my research are to develop and demonstrate novel signal processing and machine learning computational techniques and workflows on DFOS data for a variety of …
Biodegradable Heat Insulation Composites Based On Poly(Β-Hydroxybutyrate) And Date Palm Wood,
2022
United Arab Emirates University
Biodegradable Heat Insulation Composites Based On Poly(Β-Hydroxybutyrate) And Date Palm Wood, Amal Ibrahim Mlhem
Theses
Residential buildings contribute the most to energy consumption. It was found that energy savings of 20% can be achieved through the thermal insulation of residential buildings in the United Arab Emirates. For this reason, research has been conducted in the field of sustainable thermal insulation materials. Wood-Plastic Composites (WPC) are a relatively new generation of biocomposites and are particularly suitable for construction and building applications, which offers high thermal and acoustic insulation properties., reducing carbon emissions and decreasing negative impacts on the environment due to their biodegradability, sustainability, renewability, and recyclability. The first part of this study investigated the thermal …
Utilizing Date Pits In Microencapsulation: Effect Of Different Variations On Probiotic Survivability Under In Vitro Digestion,
2022
United Arab Emirates University
Utilizing Date Pits In Microencapsulation: Effect Of Different Variations On Probiotic Survivability Under In Vitro Digestion, Asmaa Samir Al Hamayda
Theses
This work deals with the medicinal use of date pit powder, which turns it from a waste product to a useful stabilizer for the release of beneficial probiotics in the human intestine. The main objective of this work is to encapsulate probiotics with date pit beads and their subsequent release in the human intestine. The beads were formed using gravitational dripping technique, while INFOGEST protocol was used to test the digested beads and the release of viable probiotic cells. For the three date varieties Raziz, Naghal and Khadrawy, it was found that 0.1 g of date pit powder per 0.2 …
Mantle Dynamics Of The North China Craton: New Insights From Mantle Transition Zone Imaging Constrained By P-To-S Receiver Functions,
2022
Missouri University of Science and Technology
Mantle Dynamics Of The North China Craton: New Insights From Mantle Transition Zone Imaging Constrained By P-To-S Receiver Functions, Lin Liu, Stephen S. Gao, Kelly H. Liu, William L. Griffin, Sanzhong Li, Siyou Tong, Jieyuan Ning
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Cratons are generally defined as stable continental blocks with a strong cratonic root that typically is at least ∼200 km thick. Many cratons have undergone little internal tectonism and destruction since their formation, but some of them, such as the eastern part of the North China Craton (NCC), the Dharwar Craton and the Wyoming Craton, have lost their thick cratonic root and become reactivated in recent geological history, leading to widespread Meso-Cenozoic volcanisms. The mechanisms responsible for such decratonization remain debated. To provide new constraints on models leading to decratonization, in this study we stack 612 854 source-normalized P-to-S conversions …
Laboratory Evaluation Of A Novel Self-Healable Polymer Gel For Co2 Leakage Remediation During Co2 Storage And Co2 Flooding,
2022
Missouri University of Science and Technology
Laboratory Evaluation Of A Novel Self-Healable Polymer Gel For Co2 Leakage Remediation During Co2 Storage And Co2 Flooding, Tao Song, Zhanmiao Zhai, Junchen Liu, Yugandhara Eriyagama, Mohamed Ahdaya, Adel Alotibi, Ze Wang, Thomas P. Schuman, Baojun Bai
Chemistry Faculty Research & Creative Works
For CO2 storage in subsurface reservoirs, one of the most crucial requirements is the ability to remediate the leakage caused by the natural fractures or newly generated fractures due to the increasing pore pressure associated with CO2 injection. For CO2 Enhanced Oil Recovery (EOR), high conductivity features such as fractures and void space conduits can severely restrict the CO2 sweep efficiency. Polymer gels have been developed to plug the leakage and improve the sweep efficiency. This work evaluated a CO2 resistant branched self-healable preformed particle gel (CO2-BRPPG) for CO2 plugging purpose. This …
Long-Time Kinetic Impact On Key Factors Affecting Asphaltene Precipitation,
2022
Missouri University of Science and Technology
Long-Time Kinetic Impact On Key Factors Affecting Asphaltene Precipitation, Ato Kwamena Quainoo, Abdulmohsin Imqam
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The employment of predictive techniques combining kinetic and thermodynamic analyses is the succinct solution to effectively control asphaltene precipitation during crude oil production. Although thermodynamic processes and conditions have been well studied in the literature, the effect of long-time kinetics on the key factors affecting the precipitation of asphaltenes was not critically studied. This work employed a model oil for asphaltene precipitation long-time kinetic observations. Filtration and confocal microscopy experimentations for time periods of 0-7200 min were utilized to study asphaltene yields and sizes at room and high temperatures (25, 50, and 70 °C), rotation speeds (60 and 150 rpm), …
A Comprehensive Review Of Experimental Evaluation Methods And Results Of Polymer Micro/Nanogels For Enhanced Oil Recovery And Reduced Water Production,
2022
Missouri University of Science and Technology
A Comprehensive Review Of Experimental Evaluation Methods And Results Of Polymer Micro/Nanogels For Enhanced Oil Recovery And Reduced Water Production, Junchen Liu, Abdulaziz Almakimi, Mingzhen Wei, Baojun Bai, Ibnelwaleed Ali Hussein
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
In recent years, polymer micro/nanogels which are re-crosslinked polymers with 3D networks, have attracted a lot of interest in Enhanced Oil Recovery (EOR) field. In size of micro/nanometers, these gel particles are designed to be conformance control agents for in-depth fluid diversion, and various experimental research have been undertaken to investigate the possibilities of applying micro/nanogels in oilfield. However, it is still unclear that how to utilize micro/nanogels to their full potential in oilfield because the transport mechanisms and EOR mechanisms of micro/nanogels are not well studied currently. By reviewing experimental evaluations and corresponding results of micro/nanogels, including evaluation of …
Fabrications And Applications Of Micro/Nanofluidics In Oil And Gas Recovery: A Comprehensive Review,
2022
Missouri University of Science and Technology
Fabrications And Applications Of Micro/Nanofluidics In Oil And Gas Recovery: A Comprehensive Review, Junchen Liu, Yandong Zhang, Mingzhen Wei, Xiaoming He, Baojun Bai
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Understanding fluid flow characteristics in porous medium, which determines the development of oil and gas oilfields, has been a significant research subject for decades. Although using core samples is still essential, micro/nanofluidics have been attracting increasing attention in oil recovery fields since it offers direct visualization and quantification of fluid flow at the pore level. This work provides the latest techniques and development history of micro/nanofluidics in oil and gas recovery by summarizing and discussing the fabrication methods, materials and corresponding applications. Compared with other reviews of micro/nanofluidics, this comprehensive review is in the perspective of solving specific issues in …
A Database Of Teleseismic Shear-Wave Splitting Measurements For The Ordos Block And Adjacent Areas,
2022
Missouri University of Science and Technology
A Database Of Teleseismic Shear-Wave Splitting Measurements For The Ordos Block And Adjacent Areas, Lin Liu, Stephen S. Gao, Kelly H. Liu, Tu Xue, Yan Jia, Sanzhong Li
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
The Ordos block of the north China craton and its surrounding regions are affected by the India-Eurasia collision to the southwest and the subduction of the Pacific beneath the Eurasian plates to the east. To provide the foundation for delineating lithospheric deformation and asthenospheric flow beneath this tectonically diverse region, we have created a database of individual shear-wave splitting (SWS) parameters by applying a uniform set of data processing procedures. After automatic data processing and manual checking, a total of 16,228 pairs of well-defined PKS, SKKS, and SKS splitting parameters (fast orientations and splitting times) are obtained from 1023 broadband …
Crustal Structure And Subsidence Mechanisms Of The Williston Basin: New Constraints From Receiver Function Imaging,
2022
Missouri University of Science and Technology
Crustal Structure And Subsidence Mechanisms Of The Williston Basin: New Constraints From Receiver Function Imaging, Jianguo Song, Stephen S. Gao, Kelly H. Liu, Muchen Sun, Youqiang Yu, Fansheng Kong, Kevin Mickus
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Mechanisms responsible for the long-term subsidence of intracontinental basins such as the Williston Basin in North America remain enigmatic, partly due to the thick sedimentary layer commonly found in the basins that prevents reliably imaging the deep crustal and upper mantle structures using some of the most-commonly employed seismic methods such as receiver function analysis. In this study, we used receiver functions recorded by 274 USArray and other stations in the Williston Basin and adjacent areas to investigate the layered structure of the crust in the hydrocarbon-rich intracontinental basin. After the removal of strong reverberations on the receiver functions associated …
Study On Apparent Permeability Model For Gas Transport In Shale Inorganic Nanopores,
2022
Missouri University of Science and Technology
Study On Apparent Permeability Model For Gas Transport In Shale Inorganic Nanopores, Shuda Zhao, Hongji Liu, Enyuan Jiang, Nan Zhao, Chaohua Guo, Baojun Bai
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Inorganic nanopores occurring in the shale matrix have strong hydrophilicity and irreducible water (IW) film can be formed on the inner surface of the pores making gas flow mechanisms in the pores more complex. In this paper, the existence of irreducible water (IW) in inorganic pores is considered, and, based on the Knudsen number (K (Formula presented.)) correction in shale pores, a shale gas apparent permeability model of inorganic nano-pores is established. The effect of the K (Formula presented.) correction on the apparent permeability, the ratio of flow with pore radius and the effect of IW on the apparent permeability …
Effect Of Fluid Penetration On The Damage Processes And Microseismicity Due To The Hydraulic Fracturing Of Rocks,
2022
New Jersey Institute of Technology
Effect Of Fluid Penetration On The Damage Processes And Microseismicity Due To The Hydraulic Fracturing Of Rocks, Catarina Baptista-Pereira
Dissertations
The hydraulic fracturing is used when fluids are injected inside the matrices of rocks to allow the creation of new cracks while, the propagation of the existent cracks can also occur. This process has been widely used for the past decades in the deep earth energy sector which comprises four main subsectors: 1) recovery of geothermal resources, 2) CO2 and hydrogen sequestration; 3) wastewater and nuclear waste disposal, and 4) recovery of (non)conventional fluids. By creating new flow paths or enhancing the existing ones, the pores are allowed to connect and, thus, it increases the permeability of rocks. For …
Advancing Water Resource Assessment With Insar Data And Subsidence Models,
2022
Missouri University of Science and Technology
Advancing Water Resource Assessment With Insar Data And Subsidence Models, Ryan G. Smith
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Over the past three decades, Interferometric Synthetic Aperture Radar (InSAR) has grown from a tool for monitoring earthquakes and other massive signature deformation events to tracking the subtle, slow deformation processes associated with changes in groundwater storage. Improvements in time-series processing and noise reduction, as well as improved models of deformation, have enabled this advancement. InSAR has proven to be a valuable tool for characterizing elastic deformation in regions experiencing little long-term storage loss, as well as inelastic deformation in over-stressed aquifers.
Experimental Study On Co2-Sensitive Polyacrylamide As Potential In-Situ Sealing Agent For Co2 Leakage Pathways In Geological Storage Sites,
2022
Mississippi State University
Experimental Study On Co2-Sensitive Polyacrylamide As Potential In-Situ Sealing Agent For Co2 Leakage Pathways In Geological Storage Sites, Iris Laihmen Quan Lopez
Theses and Dissertations
As the world pushes for ‘greener’ technologies and carbon neutrality, efforts have focused on creating novel ways to mitigate humankind’s carbon footprint. Carbon capture and storage (CCS) has become a prevalent technique that has proven to be an effective long-term method to safely relocate excess carbon dioxide (CO2) into subsurface formations. However, CCS is a newer technique which requires constant monitoring due to potential leakage pathways present in CO2 storage sites; therefore, a preventive approach to seal leakage pathways is recommended. This dissertation explores the potential of CO2-sensitive polyacrylamide (CO2-SPAM) as a novel …
Temporal Lidar Scanning In Quantifying Cumulative Rockfall Volume And Hazard Assessment: A Case Study At Southwestern Saudi Arabia,
2022
Missouri University of Science and Technology
Temporal Lidar Scanning In Quantifying Cumulative Rockfall Volume And Hazard Assessment: A Case Study At Southwestern Saudi Arabia, Abdullah A. Alotaibi, Norbert H. Maerz, Kenneth J. Boyko, Ahmed M. Youssef, Biswajeet Pradhan
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Rockfalls and unstable slopes pose a serious threat to people and property along roads/highways in the southwestern mountainous regions of Saudi Arabia. In this study, the application of terrestrial light detection and ranging (LiDAR) technology was applied aiming to propose a strategy to analyze and accurately depict the detection of rockfall changes, calculation of rockfall volume, and evaluate rockfall hazards along the Habs Road, Jazan Region, Saudi Arabia. A series of temporal LiDAR scans were acquired at three selected sites. Our results show that these three sites have different degrees of hazard due to their geological differences. The mean volume …
A Novel Approach To Estimate Rock Strength Parameters From Multistage Triaxial Tests (The A-Has Method),
2022
Missouri University of Science and Technology
A Novel Approach To Estimate Rock Strength Parameters From Multistage Triaxial Tests (The A-Has Method), Abo Taleb T. Al-Hameedi, Husam H. Alkinani, Shari Dunn-Norman, Munir Aldin, Sudarshan Govindarajan
Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works
Rock strength parameters are vital to creating robust geomechanical models for wellbore stability, sand production, and hydraulic fracturing. Static rock strength parameters can be estimated from single stage triaxial tests (SST) or multistage triaxial tests (MST). Although SST tests are the most accurate way to estimate rock strength parameters, SST tests require at least four to five core plugs to estimate rock strength parameters. Thus, MST tests are used as an alternative method to estimate rock strength parameters from only one core plug to overcome the limitation of materials and save time and money. However, the currently used method to …
Effect Of Organic Acids On Co2-Rock And Water-Rock Interfacial Tension: Implications For Co2 Geo-Storage,
2022
Edith Cowan University
Effect Of Organic Acids On Co2-Rock And Water-Rock Interfacial Tension: Implications For Co2 Geo-Storage, Ahmed Al-Yaseri, Nurudeen Yekeen, Muhammad Ali, Nilanjan Pal, Amit Verma, Hesham Abdulelah, Hussein Hoteit, Mohammad Sarmadivaleh
Research outputs 2022 to 2026
A small concentration of organic acid in carbon dioxide (CO2) storage formations and caprocks could significantly alter the wettability of such formations into less water-wet conditions, decreasing the CO2-storage potential and containment security. Recent studies have attempted to infer the influence of the organic acid concentration on the wettability of rock–CO2–brine systems by measuring advancing and receding contact angles. However, no studies have investigated the influence of organic acid contamination on CO2-storage capacities from rock-fluid interfacial tension (IFT) data because solid-brine and solid-CO2 IFT values cannot be experimentally measured. Equilibrium contact angles and rock-fluid IFT datasets were used to evaluate …
