Engineering Commons^™

Fluid Dynamics And Leukocyte Transit In The Lymphatic System, Huabing Li, Jingjing Zhang, Timothy Padera, James W. Baish, Lance Munn

Faculty Journal Articles

The lymphatic system plays a vital role in maintaining fluid balance in living tissue and serves as a pathway for the transport of antigen, immune cells, and metastatic cancer cells. In this study, we investigate how the movement of cells through a contracting lymphatic vessel differs from steady flow, using a lattice Boltzmann-based computational model. Our model consists of cells carried by flow in a 2D vessel with regularly spaced, bi-leaflet valves that ensure net downstream flow as the vessel walls contract autonomously in response to calcium and nitric oxide levels regulated by stretch and shear stress levels. The orientation …

Using Tensile And Compressive Stress Superposition During Incremental Forming To Manipulate Martensitic Transformation In Ss304, Elizabeth M. Mamros, Fabian Maaß, A. Erman Tekkaya, Brad L. Kinsey, Jinjin Ha

Faculty Conference Papers and Presentations

Single point incremental forming (SPIF) is a flexible manufacturing process that has applications in industries ranging from biomedical to automotive. In addition to rapid prototyping, which requires easy adaptations in geometry or material for design changes, control of the final part properties is desired. One strategy that can be implemented is stress superposition, which is the application of additional stresses during an existing manufacturing process. Tensile and compressive stresses applied during SPIF showed significant effects on the resulting microstructure in stainless steel 304 truncated square pyramids. Specifically, the amount of martensitic transformation was increased through stress superposed incremental forming. Finite …

Effects Of Crate Size On Mortality And Postural Behavior In Post-Farrowing Sows, Md Towfiqur Rahman, Tami M. Brown-Brandl, Gary A. Rohrer, Sudhendu R. Sharma, Yeyin Shi

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Preweaning mortality (PWM) is a economic and animal well-being issue for swine producers in the US. On average, producers face about a 16% pre-weaning mortality. A significant portion of this, around 6%, is because sows accidentally overlay their piglets in farrowing crates. The posture behavior of sow plays a vital role in overlaying piglets and this behavior has a significant effect on farrowing crate dimensions. This study aims to explore the interplay between farrowing crate size, mortality rates, and postural behavior in post-farrowing sows. This study employed three farrowing stalls: Traditional (T), Expanded creep area (C), and Expanded sow area …

Non-Invasive Digital Refractometer To Measure Maturation Of Climacteric Fruits, Jhoorhanah A. Halim, Denni Kurniawan, Dina S. Laila, Allysa Norjemee, Nuur A. L. Nesseruddin, Asrarul A. Noraidi, Beston F. Nore

ASEAN Journal on Science and Technology for Development

Sugar content is a superior quality indicator for the post-harvesting and ripening status of climacteric fruits. Total soluble solids (TSS) represented by °Brix index is a measure of the sugar content. The conventional way to measure TSS is by invasive (IN) technique using manual or digital refractometers. While non-invasive (NIN) infrared refractometer devices have been developed in recent years for various agricultural and food science applications, its accuracy to measure fruit TSS directly is not straightforward, as the device is only dedicated to uses for a specific fruit. This study aims to investigate the suitability of the use of a …

Unveiling The Antioxidant Properties Of Stenochlaena Palustris And Diplazium Esculentum Through Time-Dependent Analysis, Nurnajiihah A. Samad, Hasna B. Mazalan, Hazimah Sharifulazar, Aida M. Basri, Masayoshi Arai

ASEAN Journal on Science and Technology for Development

Medicinal plants are generally known for its health benefits and there has been ongoing research to gather evidence on potential plants that could exhibit antioxidant activities. In this study, we explored underutilised local medicinal plants which are Stenochlaena palustris and Diplazium esculentum, locally known as ‘Lemiding’ and ‘Pakis’, respectively. The aim was to determine the effect of extraction time on phytochemical contents, antioxidant activities and total phenolic content (TPC) of the two plant species. Maceration method was used to extract the compounds from leaves of the plant in distilled water at different durations of extraction i.e. 2 hours, 4 hours, …

An Assessment Of User Satisfaction On Remote Court Hearings In The Brunei Civil Court, Hazwani Masli, Seyed M. Buhari

ASEAN Journal on Science and Technology for Development

Remote court hearings (RCHs) have significantly benefited the Brunei Civil Court in maintaining its judicial system and reducing backlogs as a preventative measure, during COVID-19. RCHs have enhanced the judicial system's accessibility, saving resources and increasing court performance and productivity. However, technical problems and mistrust have slowed the RCH's adoption. This study assessed user satisfaction with remote court hearings using the Technology Acceptance Model (TAM) framework. Three external variables influenced the perceived usefulness of remote court hearings: trust, perceived risk, and fairness expectations. This study also included moderator variables such as age group and professions. This study showed that trust, …

Laboratory Characteristics, Performance Evaluation, And Agency Cost Analysis Of Cold-Recycled Asphalt Mixtures, Marwa B. Elaskary, Ahmed M. Awed, Alaa R. Gabr, Sherif M. El-Badawy

Mansoura Engineering Journal

This technical study offers a comprehensive investigation into the utilization of Cold Recycled Asphalt Mixtures (CRAMs) with varying proportions of Reclaimed Asphalt Pavement (RAP) in the context of pavement maintenance applications. The study encompasses a multi-faceted analysis, encompassing laboratory mix design requirements, mix performance evaluations, and a thorough assessment of economic benefits, with the overarching goal of promoting the sustainable adoption of CRAMs in pavement maintenance. To achieve the objectives of the research, five ratios of RAP to virgin aggregates (VA) of (0%:100%), (25%:75%), (50%:50%), (75%:25%), and (100%: 0%). The research encompasses a wide array of laboratory tests and investigations …

The Role Of Smart Systems In Conservation On Sustainability Of Heritage Buildings, Aml Abd El-Wareth Mohamed

Mansoura Engineering Journal

Abstract— Historic cities with challenges in trying to integrate their heritage buildings to keep pace with the age of technology, by developing a vision for an intelligent environment (IE) of the future that would integrate smart systems for conservation on heritage. Recent, information and communications technology (ICT) progress has diverse smart heritage solutions, enhancing efficiency, sustainability, and longevity for future generations. Research problem includes challenging the possibility of integrating smart systems into heritage buildings while conserving its values, identity, and using it effectively, sustainably manner, also no comprehensive model for smart technology integration in heritage buildings for automation and control …

The Mechanical Performance Of Sustainable High Performance Concrete Containing Hybrid Polypropylene Fibers And Exposed To Elevated Temperatures, Ahmed M. Tahwia, Marwa M. Ouda, Mohamed Abdellatief, Walid E. Elemam

Mansoura Engineering Journal

The purpose of this research is to investigate the impact of hybrid micro and macro polypropylene fibers (PPFs) on the mechanical characteristics and microstructure of high performance concrete (HPC). Seven concrete mixes with different contents of hybrid polypropylene fibers were tested. The tests included the slump test, compressive and flexural strength, resistance to elevated temperatures, and concrete microstructure. Compared to the control mixture, introducing macro and micro polypropylene hybrid fibers to HPC mixes dramatically enhanced the flexural and compressive strength of concrete while lowering workability. HPC compressive and flexural strengths decrease as temperature rises, nevertheless, the strength loss rate was …

Unleashing The Potential: The Impact Of Biophilic Office Design On Enhancing Employee Productivity, Asmaa Elantary

Mansoura Engineering Journal

The observed landscape influences people in numerous ways, including aesthetic appreciation, health, and well-being. The evidence of health benefits associated with viewing those landscapes has proven exceptional value. A comprehensive review of papers on landscapes and sound effects on health was conducted. According to a growing body of evidence, exposure to visible landscapes positively affects one's health and fitness. The most pressing social and economic challenge now is increasing worker productivity, attracting, and retaining exceptionally talented employees, and improving overall employee performance. This will not happen unless companies provide a safe, comfortable, and stimulating work environment; this will not happen. …

Knowledge Gap Analysis For Efficient Form-Finding Of Lightweight Structures, Shorouk Mohamad Khedr, Mohamed Esmat Elattar, Ahmed Eltantawy, Esraa Elazab

Mansoura Engineering Journal

Historically, Performance assessment of temporary structures’ form was substantially dependent on how loads transfer along geometry. Fortunately, the development of tools has enabled designers to explore more design variations as well as testing their feasibility. This study aims to address the knowledge gap between design process, tool contributions and feasibility requirements of temporary structures. This will be achieved through analyzing the evolution of temporary structures’ design approaches including early form finding approaches, geometrical properties dependencies, reflections of both bottom -top and top-bottom approach as well as linking them to material innovations, structural contributions and manual experiments. As a result, the …

Artificial Intelligence In Education: Mathematics Teachers’ Perspectives, Practices And Challenges, Mohammad A. Tashtoush, Yousef Wardat, Rommel Al Ali, Shoeb Saleh

Iraqi Journal for Computer Science and Mathematics

Efforts have been made to include artificial intelligence (AI) in teaching and learning; nevertheless, the successful deployment of new instructional technology depends on the attitudes of the teachers who conduct the lesson. Few scholars have researched teachers' perspectives on AI use due to a general lack of expertise on how it can be used in the classroom, as well as a lack of specific knowledge about what AI-adopted tools would be like. This study investigated mathematics teachers’ perceptions of implemented AI systems and applications in Abu Dhabi Emirate schools. The sample study consists of 580 male and female math teachers …

A 10-Gb/S Single-Loop Half-Rate Dll-Based Clock And Data Recovery Circuit For Forwarded-Clock Wireline Transceivers, Abdallah K. Mohamed, Sameh A. Ibrahim, Mohy Eldin A. Abo-Elsoud

Mansoura Engineering Journal

This paper introduces a 10-Gb/s single-loop, half-rate delay-locked loop (DLL)-based clock and data recovery (CDR) circuit for forwarded-clock (FC) wireline transceivers. The proposed CDR employs a differential ring oscillator (RO) with sub-feedback loops structure for multi-phase clock generation with a single-loop operation. An Alexander phase detector utilizing a flip-flop based on an improved true single-phase clock (TSPC) logic with split outputs is adopted. The proposed DLL-based CDR is an optimized solution in terms of area and power for FC wireline transceivers. The recovered clock exhibits an RMS jitter of 590 fs and a peak-to-peak jitter of 3.8 ps. The circuit …

A Novel Method For The Production Of Pig Iron In “Hadisolb” Company (Industrial-Scale Experiments), El-Sayed A. Rassoul

Mansoura Engineering Journal

The chairman of “Hadisolb” had submitted a memorandum in 1977 in which he claimed that the company will never achieve its designed capacity unless it gets rid of the threatening impurities -high alkalis & MnO- in the blast furnace burden. Meanwhile, the DR steel companies are suffering from the generated accumulated wastes which contain > 67% Fe, zero% alkalis and traces of MnO. The novel idea here is finding the best ratio between El-Gedida ore and the waste material (W.M.). In a previous investigation a series of pilot-scale sintering experiments were performed and it was concluded that the blend containing 70% …

Study The Application Of Different Building Technology Systems Case Study: A Residential Villa In Al-Qassim Region, Ksa, Ahmed Abdelmonteleb M. Ali, Essam S. Almahmoud, Basem O. Elgendy, Azzam I. Aljutayli, Meshal A. Alhrabi, Khattab I. Alyahya

Mansoura Engineering Journal

Buildings are responsible for 39% of global energy-related carbon emissions; 11% come from materials and construction, and 28% come from operational emissions (the energy required to heat, cool, and power). Embodied carbon will contribute an increasing amount to the emissions from new buildings in the future as carbon emissions from building operations continue to decline. This study examined several construction methods and materials to evaluate alternatives for remodeling a residential villa. A villa in the Al-Qassim Region, Buraidah, served as a case study for this research. The methodology employed provided a meticulous appraisal of the building materials and techniques currently …

Analysis Of A Coaxial Magnetic Gear Optimally Designed Using Particle Swarm Optimization, Yasser Kassab, Abdelhady Ghanem, Eid Gouda

Mansoura Engineering Journal

One important key to improve the efficiency of adjustable speed drives is using magnetic gears due to their advantages in comparison to their mechanical counterparts. This paper introduces an analysis study for a magnetic gear optimally designed using the particle swarm optimization algorithm (PSO). Moreover, the results of the PSO-based design are compared with the results of another optimization design process based on a genetic algorithm for the same design parameters and constraints. The proposed magnetic gear topology to be optimized is a radially magnetized coaxial configuration with a surface-mounted permanent magnet array. The gear ratio of the proposed magnetic …

Enhancing The Perception Of Public Urban Spaces Via Place-Making: Martyrs' Square And Selected Locations In El-Gaish Street Case Study, Vert Kamal Ramzy, Nanees Abdel Hamid Mohamed Ali Elsayyad, Lamis Saad El-Din El-Gizawi

Mansoura Engineering Journal

Trust be told that urban spaces have generated a lot of controversy in recent years. The major issues that I will address in this paper are transformations in the urban environment affected by different appearances due to economic and social changes that shape their meaning through human interactions for creating a social life. With the emergence of modern architecture and planning patterns, urban spaces have become the focus of researchers for study and analysis to determine the best destination.

This paper aims to present place-making as an approach to strengthening the perception of public urban spaces and, consequently, its impact …

Estimating Passenger Demand Trends And Passenger Characteristics Along Raml Tram, Hassan Mahdi, Raghdaa Al-Mahdi, Amir Al Samman, Enas Nashed, Noor Elmitiny, Yousra El Gohary, Mohamed Gharieb, Ahmed Elmahyli, Zainab Taha, Abdalla Kandil

Mansoura Engineering Journal

The main objective of this paper is to estimate the current passenger demand trends and passenger perception of Raml Tram usage. In order to undertake this task it was needed to conduct passenger count in addition to undertaking passenger survey along Raml Tram. The main conclusions of this research shows that the maximum number of passengers in summer is 373 compared to the corresponding value which is 420 passengers in school time for Bakous line. similarly, maximum number of passengers in summer is 279 compared to the corresponding value which is 347 passengers in school time for Bakous line. This …

A Chemistry-Transport Model Study For Source Contributions Of Pm2.5 And Its Implications For Southeast Asia Regional Haze Management Policy, Abdul Wahab

Chulalongkorn University Theses and Dissertations (Chula ETD)

PM2.5 pollution is a persistent issue in Southeast Asia. In response, the Association of Southeast Asian Nations (ASEAN) launched the Second Hazefree Roadmap (2023-2030) to alleviate this issue. This roadmap can be an important institutional measure to reduce PM2.5 pollution regionally; however, it largely centres on biomass burning and does not comprehensively tackle other sources. This study aims to quantify the contributions of three key sectors—biomass burning, transport, and industry—to PM2.5 pollution. In addition, for the focus of Thailand, the study assesses transboundary PM2.5 pollution coming into Thailand. We employ the GEOS-Chem chemistry transport model, a widely used global model …

Experimental Investigation Of Self-Mixing Interferometric Technique For Displacement Assessment, Dulanjana Anuhas Egodagamage

Chulalongkorn University Theses and Dissertations (Chula ETD)

The self-mixing interferometric (SMI) technique has proven effective for achieving precise, contactless measurements of submicron displacements. This study aims to further investigate and experimentally assess the capabilities of the SMI technique in displacement sensing. While extensive research has been conducted on the SMI technique for displacement sensing, its performance can still be further explored in scenarios where the target exhibits varying displacement amplitudes and oscillation frequencies. Understanding the limitations and ranges of the SMI technique is crucial for advancing laboratory-based setups into practical applications. An experimental optoelectronic setup was used in this work, employing a semiconductor laser diode module integrated …

Synthesis Of Carbon Nanomaterials From Sale Gas Using Nimo/Mgo Catalyst, Ahsan Khan

Chulalongkorn University Theses and Dissertations (Chula ETD)

This study aims to convert greenhouse gases into valuable nanomaterials as a sustainable way to capture and utilize carbon. It examines the synthesis of carbon nanotubes (CNTs) from a methane-ethane mixture (sale gas) with CO₂ added in different reactor setups. A NiMo/MgO catalyst was used to enhance CNT growth. Nickel and molybdenum act as active sites, facilitating to break carbon bonds and supporting CNT formation. The addition of CO₂ promotes dry reforming, which enhances syngas production and influences CNT properties. Factors like gas composition, CO₂ presence, and reactor type affect CNT structure and yield. Extended reaction times improved graphitization, creating …

แนวทางการจัดการฝุ่นละอองขนาดเล็กไม่เกิน 2.5 ไมครอน:กรณีศึกษาพื้นที่เขตดินแดงและเขตปทุมวัน, ณัชภรณ์ ภัทรพงศ์ดิลก

Chulalongkorn University Theses and Dissertations (Chula ETD)

มลพิษทางอากาศโดยเฉพาะจาก PM2.5 เป็นปัญหาสำคัญที่ส่งผลกระทบต่อสุขภาพและคุณภาพชีวิตของมนุษย์ในปัจจุบัน ประเทศไทยเป็นอีกหนึ่งประเทศที่ประสบปัญหาจาก PM2.5 โดยเฉพาะในพื้นที่กรุงเทพมหานครที่มีค่าเกินมาตรฐานที่กำหนดไว้ ซึ่งส่งผลกระทบต่อความมั่นคงของประเทศทั้งในด้านเศรษฐกิจและสังคมอีกทั้งรวมไปถึงส่งผลกระทบต่อสุขภาพของประชาชน ก่อให้เกิดการตายก่อนวัยอันควรในประเทศไทย ประมาณ 50,000 คนต่อปี และกระทบต่อภาพลักษณ์ของกรุงเทพมหานครในฐานะศูนย์กลางการท่องเที่ยว โดยงานวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาแหล่งกำเนิดของมลพิษฝุ่น PM2.5 กรณีศึกษาเขตปทุมวันและเขตดินแดง วิเคราะห์แนวโน้มความสัมพันธ์ระหว่างความเข้มข้นของมลพิษทางอากาศ PM2.5 กับจำนวนของยานยนต์ โดยศึกษาข้อมูลตั้งแต่ปี พ.ศ. 2562-2566 และศึกษามาตรการในการแก้ปัญหา PM2.5 และนอกจากนี้ในงานวิจัยนี้ได้ทำการระบุแหล่งกำเนิดในพื้นที่เขตปทุมวันด้วยวิธี Factor Analysis ผลการศึกษาของการทบทวนเอกสารและผลของการวิเคราะห์ด้วย Factor Analysis พบว่าแหล่งกำเนิดสำคัญที่ส่งผลไปยังมลพิษฝุ่น PM2.5 คือ ฝุ่นถนนและฝุ่นที่ออกมาจากปลายท่อไอเสียยานยนต์ อีกทั้งจำนวนรถที่วิ่งบนถนนในเขตพื้นที่ที่ศึกษาเป็นอีกปัจจัยที่มีผลต่อค่าเฉลี่ย PM2.5 มีรถวิ่งมากยิ่งทำให้จำนวนวันที่ค่าเฉลี่ยมลพิษฝุ่น PM2.5 เกินมาตรฐานมากขึ้น และนอกจากนี้ มาตรการ Work From Home ที่ได้บังคับใช้ในสถานการณ์โควิด-19 สามารถทำให้มลพิษฝุ่น PM2.5 จากแหล่งกำเนิดประเภทยานพาหนะลดลง

Context-Free Grammar Framework For Automatic Shooting Game Enemy Pattern Generation, Nitit Kaweeratanakit

Chulalongkorn University Theses and Dissertations (Chula ETD)

This research proposes a framework for generating enemy patterns for SHMUPs game. It is directly based on a grammar derived from the enemy behavior of existing commercial SHMUPs, and implemented using a new description language called "Enemy Pattern Description Language" (EPDL). EPDL contains all information required to construct the enemy, with no requirement of external data content. The language is human-readable and can be connected to any game engine of choice using an EPDL interpreter. The interpreter itself consists of lexer and recursive descent parser. The results shown in this research is implemented in. "rdnh", a private fork of Touhou …

การพยากรณ์การจ่ายยาของโรงพยาบาลโดยการเรียนรู้ของเครื่องและวิธีการวิเคราะห์เชิงสถิติ, วริศ ปุณณะหิตานนท์

Chulalongkorn University Theses and Dissertations (Chula ETD)

ในปัจจุบันการพยากรณ์การจ่ายยาของโรงพยาบาลถือเป็นหัวใจสำคัญต่อการจัดการคลังยาและการสั่งซื้อยาเป็นอย่างมาก เนื่องจากการพยากรณ์ที่น้อยเกินไปทำให้ยาไม่เพียงพอส่งผลให้เกิดความล่าช้าภายในโรงพยาบาล ในขณะที่การพยากรณ์ที่มากเกินไปทำให้เปลืองพื้นที่ใช้สอยและอาจทำให้ยาเสื่อมสภาพหรือหมดอายุซึ่งส่งผลให้โรงพยาบาลสูญเสียรายได้ การมีแบบจำลองที่สามารถพยากรณ์ปริมาณการจ่ายยาให้ใกล้เคียงกับค่าจริงจะสามารถลดปัญหาการขาดแคลนยาในแต่ละห้องจ่ายยาหรือการที่ห้องจ่ายยามีการกักตุนตัวยาเกินความจำเป็น จากปัญหาที่กล่าวมาข้างต้น โครงงานมหาบัณฑิตนี้จึงถูกจัดทำขึ้นเพื่อนำเสนอแบบจำลองที่จะมาแทนค่าเฉลี่ยเคลื่อนที่แบบทั่วไปซึ่งจะช่วยให้โรงพยาบาลสามารถพยากรณ์ปริมาณการจ่ายยาแต่ละวันได้แม่นยำมากขึ้น โดยจะนำเทคนิคสำหรับพยากรณ์ข้อมูลที่อยู่ในรูปแบบของอนุกรมเวลามาประยุกต์ใช้กับข้อมูลการจ่ายยาย้อนหลังและข้อมูลการนัดหมายแพทย์ย้อนหลัง หลังจากนั้นจะนำผลลัพธ์ที่ได้มาคำนวณค่าเคลาดเคลื่อนด้วยค่าเฉลี่ยของเปอร์เซ็นต์ความคลาดเคลื่อนสัมบูรณ์และค่าเฉลี่ยสมมาตรของเปอร์เซ็นต์ความคลาดเคลื่อนสัมบูรณ์และนำผลที่ได้มาใช้ในการเลือกว่าแบบจำลองไหนให้ค่าคลาดเคลื่อนต่ำที่สุด ผลการทดลองพบว่าแบบจำลองซัพพอร์ตเวกเตอร์รีเกรสชันให้ค่าความคลาดเคลื่อนที่ต่ำกว่าค่าเฉลี่ยเคลื่อนที่แบบทั่วไป แบบจำลองที่ผู้จัดทำโครงงานนำเสนอสามารถนำไปประยุกต์ใช้กับการพยากรณ์การจ่ายยาเพื่อให้แต่ละห้องจ่ายยามียาสำหรับให้บริการในปริมาณที่เพียงพอต่อความต้องการ

การพัฒนาแพลตฟอร์มเมตาเวิร์สแบบเว็บที่มีระบบสนับสนุนปัญญาประดิษฐ์, สืบพงศ์ น้อยศรี

Chulalongkorn University Theses and Dissertations (Chula ETD)

วิทยานิพนธ์ฉบับนี้นำเสนอการพัฒนาต้นแบบแพลตฟอร์มเมตาเวิร์สที่มีขีดความสามารถขั้นพื้นฐานครอบคลุมระบบอวาทาร์ ระบบผู้ใช้หลายราย ระบบสื่อสารตามเวลา ระบบการเชื่อมต่อแชตบอต และฉากโลกเสมือนจริงสามมิติที่เหมือนจริง แพลตฟอร์มที่พัฒนาขึ้นนี้ถูกนำไปใช้ประโยชน์กับหน่วยงานภาคการศึกษาและภาคธุรกิจ ทั้งหน่วยงานภายในจุฬาลงกรณ์มหาวิทยาลัยและสถาบันการศึกษาทั้งในประเทศและระดับนานาชาติ ผลการทดสอบพบว่าระบบทำงานได้ให้ผลสัมฤทธิ์ที่ดีและมีคุณภาพตามความต้องการใช้งานในทางปฏิบัติ สามารถประยุกต์ใช้กับการสร้างห้องเรียนเสมือนออนไลน์ในโลกเสมือนจริง รองรับระบบการสื่อสารระหว่างผู้ใช้ทั้งภาพ เสียง และข้อความ อีกทั้งยังสามารถใช้งานร่วมกับระบบแชตบอตจากภายนอกได้ผ่านระบบเอพีไอที่พัฒนาขึ้น ผลการทดสอบบนระบบคลาวด์ของบริษัท โทรคมนาคมแห่งชาติ จำกัด แสดงให้เห็นว่าระบบสามารถรองรับปริมาณผู้ใช้งานได้ไม่น้อยกว่า 30 รายพร้อมกัน ผลการทดสอบในเชิงประสบการณ์การใช้งานมีระดับความพึงพอใจในเชิงบวก งานวิจัยและพัฒนาจึงให้ประโยชน์และเป็นจุดเริ่มต้นของการประยุกต์ใช้เทคโนโลยีเมตาเวิร์สในวงกว้าง

Experimental Investigation Of Liquid Metal Embrittlement In Hot-Dip Galvanized Structural Steel, Amelia Mcnamee

College of Graduate Studies: Theses & Dissertations

This research investigated the liquid metal embrittlement (LME) of hot-dipped galvanized structural steel. The relationship between stress and failure time was analyzed to evaluate the potential presence of a critical stress threshold beyond which LME may occur. A testing apparatus to induce axial stress was designed and assembled in-house. A36 low carbon steel was tested in this study. Different deadweight loadings were applied to the testing sample along the axial direction. The test temperature was maintained by a programmable furnace while the sample gauge section was submerged in a molten zinc bath. Failure time and total displacement of the steel …

Implementation Of Cavity Vortex Generators To Mitigate Stall And Ice Accretion On The Naca 0012, Eric Pernell

College of Graduate Studies: Theses & Dissertations

With the growing environmental concerns of international aviation carbon emissions are driven by the ever-increasing commercial aviation traffic. This study aims to increase the aerodynamic efficiency of the NACA 0012, by implementing cavity vortex generators with the intent to increase the effective stall angle without a substantial increase of drag. This study is performed with Reynolds Averaged Navier-Stokes (RANS) at a low Reynolds of 5.0E+04 with varying cavity depths along the leading edge. The depths study is placed at 10 percent cord at depths of 3, 5, and 10 percent cord. All cavity vortex generators effectively increased the stall angle …

Environmental Assessment Of Biomass/ Torrefied Biomass And Waste Coal Co-Fired Power Plants With The Incorporation Of Carbon Capture And Storage Technologies, Surja Sarkar

College of Graduate Studies: Theses & Dissertations

Climate change is a worldwide problem that has recently garnered significant attention in recent years. While widespread emissions of greenhouse gases, mainly CO₂, from the combustion of fossil fuels, contribute to global warming, biomass-based heat and electricity generation, on the other hand, is rapidly growing due to its smaller carbon footprint, aiding in attaining the goal of zero carbon emissions. In this study, the environmental assessment of the waste coal and biomass/ torrefied biomass co-fired power plants was completed using the life cycle assessment (LCA) methodology through the performance assessment of the co-fired power plants using the commercial …

Detecting Bearing Race Defects With Inductive Magnetic Reluctance Sensors And Artificial Neural Networks, Collin Daly

College of Graduate Studies: Theses & Dissertations

This work proposes a method of detecting physical damage to bearing races in a rotational assembly by means of magnetic reluctance sensors generating a signal from a rotating gear-tooth wheel. A nominally sinusoidal signal is generated based on the rotation of a gearwheel with regularly spaced voids and lands. Detection is based on the time variance of the signal periodically in relation to the gearwheel and the bearing damage. The purpose of this work is to propose a process to detect and classify bearing race defects using existing sensors and neural networks for hazardous area equipment applications.

Effects Of Additions On The Microstructure, Macrostructure, And Mechanical Properties Of Gray Iron, Evan J. Carter

College of Graduate Studies: Theses & Dissertations

The iron matrix is a major component of the gray iron (GI) microstructure, which is the transformation product of austenite during solidification. It is generally accepted that the structure of the austenite will impact the final grain structure and thus the properties of GI. Refinement of the austenite grain structure has the potential to increase the strength of GI. Knowledge of controlling austenite grain size with common alloy additions in GI is very limited and is investigated in this research. Utilizing the DAAS heat treatment process, the austenite grain boundaries can be retained and observed directly. The observations were correlated …