Engineering Commons^™

เทคนิคการสำรวจจากระยะไกลเพื่อการตรวจจับพื้นที่ที่มีการเตรียมแปลงปลูกข้าวนาปรังในช่วงต้นฤดูแล้ง กรณีศึกษา ในเขตชลประทานของจังหวัดสุพรรณบุรี, ณัฐชญา ถนอมกลิ่น

Chulalongkorn University Theses and Dissertations (Chula ETD)

การศึกษาวิจัยครั้งนี้ได้เสนอวิธีการในการตรวจจับพื้นที่ที่มีการเตรียมแปลงปลูกข้าวนาปรังในช่วงต้นฤดูแล้งในพื้นที่เขตชลประทานในจังหวัดสุพรรณบุรีด้วยเทคนิควิธีการของการสำรวจระยะไกล โดยใช้อนุกรมดัชนีพืชพรรณผลต่างแบบนอร์แมลไลซ์ (Normalized Difference Vegetation Index, NDVI) วงจรชีพลักษณ์ของข้าว รวมถึงข้อมูลภาพถ่ายดาวเทียมต่างช่วงเวลา โดยนำข้อมูลจากกรมส่งเสริมการเกษตรมาใช้ในการตรวจสอบความถูกต้อง โดย NDVI Spectral Profile ของพื้นที่เตรียมแปลงปลูกข้าวจะต้องอยู่ในช่วงระหว่าง -0.3 - 0.3 จากผลการทดลองพบว่าในช่วงฤดูแล้งของปี 2557/2558 ซึ่งเป็นปีที่มีการประกาศให้มีการงดทำการปลูกข้าวในฤดูแล้ง มีความถูกต้องคิดเป็นร้อยละ 76 ของพื้นที่ที่ใช้ในการสุ่มทดสอบ สำหรับผลการตรวจจับพื้นที่ในการปลูกข้าวปี 2558/2559 พบว่ามีพื้นที่ในการปลูกข้าวนาปรังคิดเป็นร้อยละ 90 และในการตรวจจับพบว่าเป็นพื้นที่ที่มีการทำการเกษตรชนิดอื่นๆที่ไม่ใช่การปลูกข้าวนาปรัง คิดเป็นร้อยละ 10 ของพื้นที่ที่ใช้ในการสุ่มทดสอบ สาเหตุที่ทำให้ช่วงปี 2558/2559 มีความถูกต้องที่มากกว่าปี2557/2558 ส่วนหนึ่งนั้นมาจากเป็นปีที่ไม่ได้มีการประกาศให้งดปลูกข้าวนาปรังรวมไปถึงข้อมูลจากกรมส่งเสริมการเกษตรมีการตรวจสอบพื้นที่จริงเพิ่มขึ้นจึงทำให้ข้อมูลมีความถูกต้องมากขึ้น จากผลการตรวจสอบความถูกต้องเป็นการแสดงให้เห็นถึงความสำเร็จในการนำอนุกรมดัชนีพืชพรรณผลต่างแบบนอร์แมลไลซ์มาใช้ในการตรวจจับพื้นที่เตรียมแปลงปลูกข้าวนาปรัง โดยงานวิจัยนี้สามารถนำมาประยุกต์ใช้ในการตรวจจับพื้นที่ที่มีการเตรียมแปลงปลูกข้าวนาปรังในพื้นที่บริเวณอื่นๆร่วมกับสมุดทะเบียนเกษตรกรของกรมส่งเสริมการเกษตรได้อย่างมีประสิทธิภาพมากขึ้น ซึ่งในอนาคตอาจมีการพิจารณาปัจจัยอื่นๆร่วมด้วยเช่นการนำค่าดัชนีพืชพรรณชนิดอื่นๆเข้ามาช่วยในการทดสอบและเพิ่มความละเอียดถูกต้องของภาพดาวเทียม เข้ามาช่วยในการตรวจจับพื้นที่ได้

Surface Water And Groundwater Interaction Mechanism: Plaichumphol Irrigation Project As A Study Area, Pwint Phyu Aye

Chulalongkorn University Theses and Dissertations (Chula ETD)

The Plaichumphol Irrigation Project is an irrigation area which depends on both irrigation water and groundwater for long time. Farmers in that area have their cultivation almost whole year. Therefore groundwater supply is a major alternative source especially in dry periods. The aims of this study are to understand the interactions and parameters of land and river recharge, to analyse the surface water and the surface water and groundwater interaction mechanism via development of local groundwater model.
For this purpose, groundwater flow model (GMS) was used to develop regional and local groundwater models. The model was calibrated from 1993-1997 and …

ผลของการเติมอะลูมินาต่อพฤติกรรมการไหลตัวของของไหลเชียร์ทิกเคนนิง, ณัฐณิชา นวมภักดี

Chulalongkorn University Theses and Dissertations (Chula ETD)

ของไหลเชียร์ทิกเคนนิงกำลังเป็นที่สนใจในงานหลายด้านรวมถึงงานทางด้านเกราะกันกระสุน ในงานวิจัยนี้ได้ทำการศึกษาอิทธิพลของปริมาณซิลิกาและการเติมสารตัวเติมอะลูมินาที่มีต่อพฤติกรรมการไหลตัวของของไหลเชียร์ทิกเคนนิงในระบบซิลิกา-พอลิเอทิลีนไกลคอล โดยทำการปรับเปลี่ยนปริมาณความเข้มข้นซิลิกาจาก 30% ถึง 52% โดยปริมาตร พบว่าเมื่อปริมาณซิลิกาต่ำกว่า 40% โดยปริมาตร ของไหลแสดงพฤติกรรมการไหลตัวแบบนิวโตเนียน และเมื่อปริมาณซิลิกาในสารแขวนลอยสูงกว่า 40% โดยปริมาตร การไหลตัวจะมีพฤติกรรมแบบเชียร์ทินนิง ณ ช่วงอัตราการเฉือนต่ำ และเปลี่ยนพฤติกรรมการไหลตัวเป็นแบบเชียร์ทิกเคนนิงเมื่ออัตราการเฉือนเพิ่มขึ้นถึงค่าหนึ่ง นอกจากนี้เมื่อปริมาณซิลิกาเพิ่มขึ้น อัตราการเฉือนวิกฤติหรือค่าอัตราการเฉือนที่เริ่มเกิดพฤติกรรมการไหลตัวแบบเชียร์ทิกเคนนิงมีค่าลดลง ในขณะที่อัตราการเกิดเชียร์ทิกเคนนิงเพิ่มสูงขึ้น ในการปรับปรุงประสิทธิภาพของเกราะกันกระสุนได้ทำการเติมอนุภาคของแข็งอะลูมินา ลงในของไหลเชียร์ทิกเคนนิงที่มีความเข้มข้นซิลิกาเท่ากับ 50% โดยปริมาตร พร้อมทั้งทำการปรับเปลี่ยนชนิดของสารตัวเติมอะลูมินา ได้แก่ TMDA AMS-9 และ A-32 รวมถึงปริมาณของสารตัวเติมจาก 1% ถึง 5% โดยปริมาตร พบว่า ขนาดอนุภาคสารตัวเติมที่เล็กลงและปริมาณสารตัวเติมที่เพิ่มขึ้น ส่งผลให้ความหนืดเพิ่มขึ้นในขณะที่อัตราการเฉือนวิกฤติมีค่าลดลง นอกจากนี้การเติมสารตัวเติมอะลูมินา AMS-9 และ A-32 ในสารแขวนลอยซิลิกา-พอลิเอทิลีนไกลคอล ทำให้อัตราการเกิดเชียร์ทิกเคนนิงเพิ่มสูงขึ้น ของไหลที่มีสภาวะเหมาะสมได้ถูกนำมาใช้ในกระบวนการจุ่มแช่สิ่งทอเคฟล่าเพื่อผลิตชิ้นงานเกราะชนิดของเหลว โดยการเติม A-32 ปริมาณ 5% โดยปริมาตร เนื่องจากแสดงอัตราการเกิดเชียร์ทิกเคนนิงสูงที่สุด จากนั้นชิ้นงานที่ผ่านกระบวนการจุ่มแช่ได้ถูกนำมาตรวจสอบความต้านทานต่อการแทง โดยในงานวิจัยนี้ยังไม่อาจสรุปได้แน่ชัดว่าชิ้นงานเกราะรูปแบบใดสามารถต้านทานต่อการแทงได้ดีที่สุด

Effectiveness Of Ammonium Ion In Low Salinity Waterflooding In Shaly-Sandstone Reservoir, Hung Vu Quoc

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this study was presented the pre-feasibility study of silica sand processing plant in Sihanoukville province. The resources approximately 8,750,000 tons, would be a high potential deposit for the glass industry. In this study focuses on the characteristics of the silica sand, methodology to remove the impurities which contained high Fe2O3, Al2O3 and another major oxide element, and economic evaluation technique. To identification of silica sand which used sieve analysis, Frantz isodynamic magnetic separator following by electrical microscope, XRD, and XRF. Therefore, to upgrade the quality of silica sand, which is using Shaking Table, Wet High-Intensity Magnetic Separator, and Reverse …

Atomic Probe Tomography And Creep Deformation Studies Of Highly Dynamic Metallic Systems: Copper-Zirconium Based Metallic Glass Alloys And Tin-Based Alloy, Chetarpa Yipyintum

Chulalongkorn University Theses and Dissertations (Chula ETD)

The early crystallization process of a Cu-Zr binary metallic glass was investigated by transmission electron microscopy (TEM) and atomic probe tomography (APT). The microstructural analysis was carried out using different characterization methods to see if the phase separation in different chemical compositions and chemical short-range orders were investigated by applying heat treatment under argon atmosphere in differential scanning calorimetry (DSC) chamber. Such a difference in the atomic arrangement of a given amorphous metallic structure is important, the actual characterization of such small difference is not practically easy. For the reason that there is an effect of the sample preparation method …

Thermal Stability Characterization Of Tunneling Magneto Resistive Structure For Data Storage Applications, Pornchai Rakpongsiri

Chulalongkorn University Theses and Dissertations (Chula ETD)

The conventional read sensor technology used in hard disk drives is the tunneling magneto resistive (TMR) device. The revolutions of technology have been developed to achieve high performance of reading signal resulting in very thin and complicated device layers which thermal induced degradation and defects would be concerned. In this research, a thermal stress has been applied to TMR devices between 150-250 ℃ for reliability investigation. The resistance, amplitude and asymmetry parameters, before and after the thermal stress, were measured using a quasi-static tester (QST). The results showed the temperature dependence of the percentage change in QST resistance, asymmetry and …

The Combined Material Flow Analysis And Life Cycle Assessment For Integrated End-Of-Life Of Mercury Contaminated Petroleum Waste Management, Putthita Chongchongprasert

Chulalongkorn University Theses and Dissertations (Chula ETD)

Now a day, the waste management generated by offshore petroleum operation (including drilling and production) located in the Gulf of Thailand seem to be a great challenge. Because of their unique characteristic in terms of hazardous properties, petroleum waste requires particular treatments to reduce potential impacts to the environment and human life. This study, the petroleum waste by their disposal code, and waste code was sorted. The Hg-contaminated petroleum waste flow starting from waste generation towards to final disposal was conducted by Material Flow Analysis (STAN, 2.6.601) and Life Cycle Assessment (SimaPro 8.3.0.0) was conducted as tools for evaluating the …

Co2 Reforming Of Methane On Ni And Co Containing Γ-Al2o3/Hy Zeolite Supported Catalysts, Anchittha Liu

Chulalongkorn University Theses and Dissertations (Chula ETD)

The carbon dioxide reforming of methane is one of the most effective processes to produce syngas while reducing greenhouse gases. In this study, the catalytic activity and coke resistance were studied on the Ni-based catalysts with or without Co (10%wt) over γ-Al2O3-HY zeolite support. Such catalysts were prepared by the sol-gel method with various different metal loadings and Co/Ni ratio. The activity tests on the carbon dioxide reforming reaction were performed in a fixed-bed reactor with the CH4:CO2 feed volume ratio of 1:1 under atmospheric pressure at 700°C which is the best temperature for the catalysts activity. It has been …

Preparation Of Carbon/Carbon Composite Xerogels From Resorcinol-Formaldehyde And Cotton Fiber For Electric Double Layer Capacitor, Kasawan Sirichan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research used carbon/carbon composite xerogels as an electrode for EDLCs. Cotton fibers were blended with polymer gel which was synthesized through polycondensation between resorcinol and formaldehyde. The reaction was catalyzed by Na2CO3 with distilled water as a solvent. Resorcinol-formaldehyde sol was poured into a vial containing cotton fibers. After gelation at room temperature and curing at 90 oC for a week, the resulting porous monolith was sliced into thin wafers. Then, the composite wafers were exchanged with tert-butyl alcohol, dried by vacuum drying and performed by pyrolysis at a various temperature under a nitrogen atmosphere, respectively. Effect of %cotton …

Parametric Study Of Copper Zinc Tin Sulfide Thin Films By Convective Deposition Method, Thanawat Anantamongkolchai

Chulalongkorn University Theses and Dissertations (Chula ETD)

Nowadays, most of the energy production is from fossil fuel-resources, which is a major source of greenhouse gases. Therefore, several researchers have been looking for the alternative energy that is clean and renewable energy. One of the outstanding alternatives is to utilize solar energy for conversion into electricity. Recently, CZTS (copper zinc tin sulfide, Cu2ZnSnS4) thin film solar cells have received numerous interest because of its decent energy band gap of about 1.4 - 1.6 eV, which matches with the solar spectrum, and its high absorption coefficient. Nevertheless, the manufacture of CZTS solar cells has used sophisticated methods for fabrication …

Simultaneous Electrical And Mechanical Resonance Drive For Large Signal Amplification Of Micro Resonators, M. H. Hasan, Fadi M. Alsaleem, N. Jaber, M. A. A. Hafiz, M. I. Younis

Durham School of Architectural Engineering and Construction: Faculty Publications

Achieving large signal-noise ratio using low levels of excitation signal is key requirement for practical applications of micro and nano electromechanical resonators. In this work, we introduce the double electromechanical resonance drive concept to achieve an order-of-magnitude dynamic signal amplification in micro resonators. The concept relies on simultaneously activating the micro-resonator mechanical and electrical resonance frequencies. We report an input voltage amplification up to 15 times for a micro-resonator when its electrical resonance is tuned to match the mechanical resonance that leads to dynamic signal amplification in air (Quality factor enhancement). Furthermore, using a multi-frequency excitation technique, input voltage and …

Impact Of Owners’ Early Decisions On Project Performance And Dispute Occurrence In Public Highway Projects, Sogand Hasanzadeh, Behzad Esmaeili, Ghada M. Gad, Douglas D. Gransberg

Durham School of Architectural Engineering and Construction: Faculty Publications

Disputes are common in the construction industry and lead to unnecessary cost and schedule overruns in projects. It is commonly believed that owners’ early decisions regarding the selection of delivery methods, procurement methods, and contract types impact the frequency and severity of project disputes; however, no previous study has empirically tested this hypothesis, particularly in highway public projects. Therefore, this study empirically investigated the impact of owners’ early decisions regarding project organization (i.e., delivery methods, procurement, and contract types) on performance measures (e.g., cost and schedule growth), specifically dispute performance metrics (e.g., frequency and severity of disputes), in public highway …

Method For Radon Measurement In Residential Sewer Connections, David Yuill

Durham School of Architectural Engineering and Construction: Faculty Publications

Radon gas is the most deadly indoor air pollutant. In the US, it is responsible for over 20,000 deaths per year. Residential exposure is typically the largest portion of a person’s annual exposure, so a great deal of research has been done to understand the pathways that radon can follow to enter a house. Since radon emanates from the ground, it is present in high concentration in soil gas. Recent research on the vapor intrusion of volatile organic compounds from subsurface sources into a test house concluded that the sewer line is an important preferential pathway. Despite the potential for …

Utilizing Wearable Devices To Design Personal Thermal Comfort Model, Mostafa Rafaie, Mehari Tesfay, Fadi Alsaleem

Durham School of Architectural Engineering and Construction: Faculty Publications

have confirmed that thermal comfort significantly depends on internal personal parameters such as metabolic rate, age, and health status. This is manifested as a difference in comfort levels between people residing under the same roof, and hence no general comprehensive comfort model satisfying everyone. Current and newly emerging advancements in state of the art wearable technology have made it possible to continuously acquired biometric information. This work proposes to access and exploit this data to build personal thermal comfort model. Relying on various supervised machine-learning methods, a personal thermal comfort model will be produced and compared to a general model …

Localized Indoor Temperature Estimation Using Smartphone And Laptop Internal Sensors, Mostafa Rafaie, Mehari Tesfay, Fadi Alsaleem

Durham School of Architectural Engineering and Construction: Faculty Publications

This paper investigates a mechanism in which indoor air temperature can be predicted using the temperature sensor on the battery and the CPU of smartphones or laptops, where data is easily accessible and ubiquitous. As a case study, several machine-learning methods were used to build models from a laptop data and the measured surrounding air temperature. The effects of the machine learning type and input feature size (by including other parameters such as CPU processing usage and battery charge percentage) on the model accuracy were investigated. The goal is to determine a set of feature combinations that can be used …

Comfort-Based Optimal Temperature Setpoint Calculation, Andrew Holthaus, Mostafa Rafaie, Fadi Alsaleem

Durham School of Architectural Engineering and Construction: Faculty Publications

General practice in current building HVAC control is to select building temperature setpoints that comply with ASHRAE Standard 55. By meeting this standard, based on the PMV comfort model, 80% of building occupants should be satisfied with their thermal environment. However, unfortunately, this is rarely the case. One possible reason for this is the variation in occupant activity and clothing that are usually assumed default values using this standard. In this work, we present an iterative-based algorithm to solve this problem. The algorithm solves the PMV inverse model equation to determine the optimal temperature setpoint while inferring human activity level …

Sdnet2018: An Annotated Image Data Set For Non-Contact Concrete Crack Detection Using Deep Convolutional Neural Networks, Sattar Dorafshan, Robert J. Thomas, Marc Maguire

Durham School of Architectural Engineering and Construction: Faculty Publications

SDNET2018 is an annotated image data set for training, validation, and benchmarking of artificial intelligence based crack detection algorithms for concrete. SDNET2018 contains over 56,000 images of cracked and non-cracked concrete bridge decks, walls, and pavements. The dataset includes cracks as narrow as 0.06 mm and as wide as 25 mm. The data set also includes images with a variety of obstructions, including shadows, surface roughness, scaling, edges, holes, and background debris. SDNET2018 will be useful for the continued development of concrete crack detection algorithms based on deep convolutional neural networks (DCNNs), which are a subject of continued research in …

Comprehensive Evaluation Of A Novel Eor Method-Coupling Low Salinity Water Flooding And Preformed Particle Gel To Enhance Oil Recovery In Fractured Reservoirs, Ali K. Alhuraishawy

Doctoral Dissertations

"Excess water production in oil fields is becoming a challenging economic and environmental problem as more reservoirs are maturing. Water channeling, one of the primary reservoir conformance problems, is caused by reservoir heterogeneities that lead to the development of high-permeability streaks. The recovery of oil from carbonate reservoirs is usually low due to their extreme heterogeneity caused by natural fractures and the nature of oil-wet matrix. Also, oil recovery from fractured sandstone reservoirs is often low due to areal heterogeneity. Gel treatments have proven to be a successful and inexpensive fluid diversion method when used to plug the thief zones …

Analyzing Factors Affecting Patient Satisfaction Using The Kano Model, Tejaswi Materla

Doctoral Dissertations

"Customer needs associated with the healthcare sector are constantly evolving with the technological advancements, rising costs, and shifts in patient demographics. Challenges associated with understanding patient needs impact the quality of care and life, safety, and satisfaction. The objective of this research was to develop a methodology to collect and analyze the needs associated with healthcare units that differ based on the type of care and services and patient perceptions over time. The proposed methodology provides insights into the voice of the customer through visualization of the relationship between the performance of quality attributes and customer satisfaction. Cronbach's alpha is …

Carbon Black Production, Analyzing And Characterization, Shadha Khalid Jebur

Masters Theses

"Carbon black (CB) plays a significant function in the development of the electrical and mechanical properties of high performance for a tough elastic polymeric substance such as rubber materials. Thus, CB is widely used to manufacture a massive number of products such as reinforcing and pigment phase in automobile tires due to its high ability to increase tire life by reducing the thermal damage. This material is also used in belts, hoses, and other non-tire rubber goods. Before use in valuable materials. CB should first be analyzed and characterized by different instruments to obtain its mechanical properties. A new thermal …

Advanced Process To Embed Optical Fiber Sensors Into Casting Mold For Smart Manufacturing, Raghavender Reddy Jakka

Masters Theses

"Optical fiber sensors embedded in metals with distributed sensing can sense temperature at multiple points with single fiber. This is useful for smart manufacturing like structural health monitoring in aerospace industry and smart molds in manufacturing plants. There is a huge difference in thermal coefficient of expansion for fiber and metal. This is the reason for the increase in sensitivity for embedded fiber sensors. However, at high temperatures, the stress on the fiber increases, eventually damaging the sensor. The fiber-metal interface determines the sensor performance. A tight interface results in high sensitivity and a gap in the interface enhances sensing …

Bifunctional Porous Polymeric Fiber As A Catalyst For N-Phenylglycine Synthesis And Carbonation Of Propylene Oxide To Propylene Carbonate, Ahmed Abdulghani Almuslem

Masters Theses

"In this study, development of a polymeric bi-functional porous catalyst that can be used in various applications such as batch, packed-bed, and continuous flow reactors and the formation of highly important chemicals that have many applications in the industry. With this material many homogenous reactions can be conducted in heterogeneous environment which is more efficient and profitable. The catalyst was formed by grafting hollow fiber with APS then immobilized with Br using 1,2-dibromoprobane (Br/APS/PAI-HFs). The formed catalyst was tested with BET and FTIR to confirm the immobilization of Br. A porous polymeric material Br/APS/PAI-HFs provides the ability for ring opining …

Fluid Flow In A Krogh Cylinder: A Model For A Single Capillary And Surrounding Tissue, Xianjie Qiu

Masters Theses

"A model describing the flow of plasma from the capillaries to the interstitial space in the extravascular tissue and back into the capillaries is constructed and solved. The flow through the tissue or the interstitial spaces is described by the Brinkman equation for porous medium, modified to account for the presence of cells considered as spheres. The flow of blood through the capillaries is considered to be that of a Newtonian fluid. The flow between capillary and tissue is coupled by the permeability of the capillary wall. The nature of flow and its magnitude was found to be highly dependent …

An Investigation Of The Economic Order Quantity Model With Quantity Discounts Under An Environmental Objective, Tiffanie Marie Toles

Masters Theses

"In a sustainable supply chain, retailers are the direct link between customers and products. Retailers play an important role by relaying feedback such as customer satisfaction, inventory improvement, or product improvement to the other key players in a supply chain. Their overall goal is to reduce supply chain costs, such as the cost of ordering product, transporting product, or holding product in inventory. Other costs associated in a supply chain can include environmental and operations costs. It is important to consider these costs due to the impact environmental operations play in the role of how sustainable a supply chain can …

Characterization Of Free-Radical Solution Polymerizations Of Acrylamide Initiated By Persulfate Initiator Systems, Yashu Chen

Masters Theses

”In order to reduce the water production and improve the oil recovery of mature reservoir, various conformance control technologies have been extensively developed. Preformed particle gel (PPG), a cost-effective plugging agent, has been successfully applied to block the high permeability zone and thus to displace the water to up-swept zone.

A common PPG based on polyacrylamide hydrogel have been wildly used. Identifying the parameters that affect gelation performance and understand how these parameters affect the performance is very useful to predict and manipulate the gelation time and to control the performance of gels.

The objective of this research is to …

Monobore Completion Design: Classification, Applications, Benefits And Limitations, Anwar Khaled Al-Fadhli

Masters Theses

"A monobore completion is a simple completion design that uses the same internal diameter from the bottom of the well to surface. This may be accomplished by cementing a string of casing in a well, or by having tubing stabbed into a polished bore receptacle on a casing liner the same size as the tubing. Monobore completions have been applied extensively in oil and gas fields around the world, both onshore and offshore, from very low reservoir flow to extremely high production rates, since the late 1980s. They have proven beneficial due to their simplicity and cost savings. This study …

Data Analysis Of Low-Salinity Waterflooding To Enhance The Oil Recovery In Sandstone Reservoirs, Nadia Ariani

Masters Theses

"The lack of a single reasonable general mechanism to describe how low-salinity waterflooding can improve oil recovery in both laboratory and field pilot projects has increased the interests of many researchers and stakeholders. There has not been observed the relationship of formation brine salinity and injected brine salinity to see how much salinity is reduced to produce the maximum enhanced oil recovery by LSWF. There is no guidance in what EOR stage the LSWF is best implemented. This work collects data from various published literature to develop a comprehensive data set regarding low-salinity waterflooding in sandstone reservoirs. The LSWF mechanisms …

New Wellbore-Integrity Classification For Gas Migration Problems And New Cement Formulations Using Graphene Nano Platelets To Prevent Gas Migration Through Cement, Mohammed Mousa M. Alkhamis

Masters Theses

"Gas migration, one of the primary problems related to the integrity of oil wells, is caused by cement failures. Gas migration can result in costly well repairs and may endanger personal, equipment, and result in severe operational difficulties and environmental issues. The ultimate objectives of this research were to provide a comprehensive review of the problem and to provide a solution to the problem using Graphene Nano Platelets (GNPs).

An intensive review was performed to understand the cement failures. The reasons behind these failures were analyzed and classified with respect to their locations in the wellbore. Recommendations and potential solutions …

A Novel Power Integrity Modeling Method Based On Plane Pair Peec, Siqi Bai

Masters Theses

"A low impedance power distribution network (PDN) is essential for high frequency integrated circuits. A novel modeling mothed, i.e. the plane pair PEEC method is proposed in this thesis to model the PDN of the multi-layered printed circuit board. The modeling results agrees favorably with full wave simulation and measurement. A PDN tool is develop based on this method"--Abstract, page iii.

Thermal Analysis And Control Of Small Satellites In Low Earth Orbit, Katelyn Elizabeth Boushon

Masters Theses

"Small satellites are becoming more popular in the space sector, primarily due to their lower cost and shorter development time. Much of the information available about satellite thermal analysis and control refers to larger spacecraft. Sorting through this information to find the practices specifically applicable for small satellites can be a daunting task, particularly for inexperienced engineers. This thesis study is intended to inform the reader about basic thermal control and analysis methods that relate specifically to small satellites in low Earth orbit. A case study involving a satellite designed by the Missouri University of Science and Technology Satellite Research …