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Articles 41401 - 41430 of 41519
Full-Text Articles in Entire DC Network
Navigation In Underground Mine Environments: A Simulation Framework For Quadruped Robots, Yixiang Gao, Kwame Awuah-Offei
Navigation In Underground Mine Environments: A Simulation Framework For Quadruped Robots, Yixiang Gao, Kwame Awuah-Offei
Mining Engineering Faculty Research & Creative Works
Quadruped robots have shown significant potential for navigating complex and hazardous environments, such as underground mines, where traditional wheeled or tracked systems have limitations. However, their development and deployment are hindered by the disparity between controlled laboratory testing and real-world conditions and the lack of tools (e.g., simulation testbeds) that expedite the required development and testing. This work develops a simulation testbed for expediting and advancing navigation algorithms, perception systems, and control strategies for quadruped robots in subterranean and hazardous environments. By utilizing high-fidelity 3D maps, ranging from intricate cave systems to real-world sites like the Edgar Mine, simulation environment …
Evaluating Feasibility Of Incorporating Fuel Cell Drive Trains Into Existing Haul Trucks, Ayorinde Akinrinlola, Kwame Awuah-Offei, Abdullah Al Moinee
Evaluating Feasibility Of Incorporating Fuel Cell Drive Trains Into Existing Haul Trucks, Ayorinde Akinrinlola, Kwame Awuah-Offei, Abdullah Al Moinee
Mining Engineering Faculty Research & Creative Works
Hydrogen, as a fuel source in material handling, has become a viable option for achieving carbon reduction targets. The objective of this work was to apply vehicle drive train and energy simulation in MATLAB/Simulink to guide a discussion of the challenges and opportunities of incorporating hydrogen fuel cell drive trains into the current form factors of mine haul trucks. We built and validated a model based on the Komatsu 830-E truck and used it to estimate the hydrogen requirements for typical short-haul, medium-haul, and long-haul cycles; in the short-haul case (cycle time = 852 s) the truck consumed 23.6 L …
Optimizing Acid Mist Suppression: Unraveling Surfactant Effects On Bubble Formation And Bursting Dynamics In Copper Electrowinning, Ashish Kakoria, Mirza Muhammad Zaid, Aamir Iqbal, Ellen Amoako Afful, Guang Xu
Optimizing Acid Mist Suppression: Unraveling Surfactant Effects On Bubble Formation And Bursting Dynamics In Copper Electrowinning, Ashish Kakoria, Mirza Muhammad Zaid, Aamir Iqbal, Ellen Amoako Afful, Guang Xu
Mining Engineering Faculty Research & Creative Works
The working mechanism of surfactant to reduce acid mist in copper electrowinning system is not well understood. Most of the studies are based on the surface tension reduction phenomenon but this is not the only function that causes acid mist reduction. In this paper, we investigated the effect of different surfactants on a bubble's residence time, terminal velocity, flow regime, and bursting dynamics using a high-speed camera. We have evaluated five different surfactants and found that the presence of surfactants reduces the terminal velocity, bubble diameter, and increases the residence time of the bubble in electrolyte. Especially for FC-1100, the …
Forming Of Economies Of Wellbeing Through Responsive Practice In Everyday Life, Julie Richardson
Forming Of Economies Of Wellbeing Through Responsive Practice In Everyday Life, Julie Richardson
School of Art, Design and Architecture Theses
In recent years, most Western economies have increasingly focused on the narrow pursuit of economic growth with its unintended and undesirable impacts on the wellbeing of people and planet being well-documented. This has led to the growth in ‘alternative economics’ that addresses these critiques and proposes new economic models. However, alongside these critiques, there is another that questions the modern scientific approach underpinning economics, arguing that it overlooks the importance of lived experience, creating feelings of detachment in the economic practitioner as well as undermining the relevance and effectiveness of economics and policy making. The research develops a more responsive …
And The Skylarks Called Out Your Name: Posthuman Encounters With Loss Through Embracing The More-Than-Human World., Jennifer-Anne Bradbury-Crowther
And The Skylarks Called Out Your Name: Posthuman Encounters With Loss Through Embracing The More-Than-Human World., Jennifer-Anne Bradbury-Crowther
School of Art, Design and Architecture Theses
Howling at the sea, tears in damp morning air, songs on the wind, syrup-thick summer warmth, dawn before midnight, red moon, humming, whispers. Meet me where the sky meets the sea. This thesis proposes that immersion in the more-than-human world offers possibilities for an exploration of loss and its transformative potential. Loss here not only relates to personal bereavement, but also to a lack of connection with the natural world; in these post-Covid days many are feeling overwhelmed by feelings of isolation and alienation and a sense that something intrinsic has been lost in the modern world.Posthumanism creates a supportive …
Creative Psychotherapy, Including Art. A Module For Pluralistic Identities And A Case Study From An Artist's Perspective., Amani Alsaad
Creative Psychotherapy, Including Art. A Module For Pluralistic Identities And A Case Study From An Artist's Perspective., Amani Alsaad
School of Art, Design and Architecture Theses
This thesis investigates the complexities of pluralistic identities, focusing on Arab Muslims in non-Muslim countries and Westerners residing in the Arabian Gulf. Grounded in the author’s dual heritage as an Arab Muslim artist and psychological practitioner, this study offers a distinctive perspective informed by lived experience. The author’s unique background, shaped by a Saudi Arabian birthplace and upbringing in the United Kingdom, serves as a foundation for this multidisciplinary research.The study aims to develop a creative psychotherapy module integrating art-making as a therapeutic technique to address the mental health challenges faced by individuals with pluralistic identities. These challenges, arising from …
Mesotopia: Towards A Place Of Lyrical Inquiry, Tristan Verran
Mesotopia: Towards A Place Of Lyrical Inquiry, Tristan Verran
School of Art, Design and Architecture Theses
This research project is a comprehensive investigation into the practical applications of a theoretical place of creative intuition I have called ‘the mesotopia’. A mesotopia is a place between conceptual and physical terrains in which inter-object experiential encounters are turned into communicative events. Mesotopian thinking unsettles purely anthropocentric utopian or dystopian future visions, as well as romantic images of Arcadian pasts. I have been attending to the material present of our coastal regions while attempting to intuit, rather than imagine, concealed aspects of these compositional sites. This thesis argues that attending to local environments using a more embodied form of …
Grassroots Playwriting : Practice-Led Research Exploring The Impact Of Producing Historical Verse Drama For A Local Community, Chris Savery
Grassroots Playwriting : Practice-Led Research Exploring The Impact Of Producing Historical Verse Drama For A Local Community, Chris Savery
School of Art, Design and Architecture Theses
Christ SaveryGrassroots Playwriting: Practice-led research exploring the Impact of Producing Historical Verse Drama for a local CommunityOver the past thirty years, Practice as Research has contributed to a deeper understanding of theatre ecology, particularly in relation to the complexities and nuances of grassroots community theatre. This study builds upon this body of knowledge by addressing the question: How can the creation and performance of a historical verse drama by a self-producing grassroots playwright serve as a catalyst for community engagement? Central to this thesis is the investigation into my role as a self-producing playwright within the context of grassroots theatre, …
Un-Framing Transiting Trajectories: A ‘Beyond Disciplinary’ Approach To Curating In The Context Of Art And Science Discourse, Christina Ioanna Kazakou
Un-Framing Transiting Trajectories: A ‘Beyond Disciplinary’ Approach To Curating In The Context Of Art And Science Discourse, Christina Ioanna Kazakou
School of Art, Design and Architecture Theses
Abstract
The Resistant Body In Sound: Cripping Music Creation Through Technology, Embodiment, And Disability Philosophy, Amble Ysgawen-Skuse
The Resistant Body In Sound: Cripping Music Creation Through Technology, Embodiment, And Disability Philosophy, Amble Ysgawen-Skuse
School of Art, Design and Architecture Theses
We are currently in a period where many music organisations are beginning to engage with disabled artists as a part of their diversity agenda. However, practice seems limited to questions of physical access to spaces and asks little around the philosophies of disability and how that might change the way that we think about working with disabled creatives. If issues of physical access are all that are taken into consideration we risk creating projects which embed ableists assumptions and practices into our disabled music making, which results in negative experiences for disabled artists. In order to make the progression of …
Epistolary Technologies Of Separation And Archives Of Emotion, James Daybell
Epistolary Technologies Of Separation And Archives Of Emotion, James Daybell
School of Law, Humanities and Social Sciences
No abstract provided.
“I'M Pregnant, What Do I Do?”: Exploring How People Having Abortions In Britain Find And Use Online Sources Of Information, The Sacha Study Team, Rosa Mackay, Rachel Scott, Maria Lewandowska, Rebecca Meiksin, Natasha Salaria, Patricia A. Lohr, Sharon Cameron, Melissa Palmer, Rebecca S. French, Kaye Wellings, Annette Aronsson, Paula Baraitser, Caroline Free, Louise Keogh, Clare Murphy, Wendy Norman, Jennifer Reiter, Jill Shawe, Sally Sheldon, Geoffrey Wong
“I'M Pregnant, What Do I Do?”: Exploring How People Having Abortions In Britain Find And Use Online Sources Of Information, The Sacha Study Team, Rosa Mackay, Rachel Scott, Maria Lewandowska, Rebecca Meiksin, Natasha Salaria, Patricia A. Lohr, Sharon Cameron, Melissa Palmer, Rebecca S. French, Kaye Wellings, Annette Aronsson, Paula Baraitser, Caroline Free, Louise Keogh, Clare Murphy, Wendy Norman, Jennifer Reiter, Jill Shawe, Sally Sheldon, Geoffrey Wong
School of Nursing and Midwifery
Background: Accurate, timely, and supportive information is important for high-quality abortion care. Limited research explores how people find and use online sources of information (OSI) during the abortion process, particularly in Britain. Understanding experiences of using OSI is important for the development of person-centered services and resources. Methods: We conducted a thematic analysis of qualitative data from 41 semi-structured interviews carried out in 2021/2022 with people who had recent experience of abortion in Britain. Results: Using OSI was common amongst participants. Our analysis generated four distinct motivations for doing so. People used OSI to find information about accessing abortion services. …
Identifying Outcomes And Outcome Measures In Neonatal Family-Centered Care Trials: A Systematic Review, Cansel Kocakabak, Agnes Van Den Hoogen, Melissa Rothfus, Marsha Campbell-Yeo, Johanna Kostenzer, Anna Axelin, Patricia Schofield, Jos M. Latour
Identifying Outcomes And Outcome Measures In Neonatal Family-Centered Care Trials: A Systematic Review, Cansel Kocakabak, Agnes Van Den Hoogen, Melissa Rothfus, Marsha Campbell-Yeo, Johanna Kostenzer, Anna Axelin, Patricia Schofield, Jos M. Latour
School of Health Professions
Background: A wide range of outcomes for infants and parents has been reported in clinical trials testing FCC interventions. This systematic review aimed to identify outcomes, outcome measures, and time-points reported in experimental studies testing FCC interventions in neonatal care units. Methods: This review included experimental studies investigating FCC interventions in neonatal settings. Database searches were conducted in MEDLINE, EMBASE, CINAHL, Cochrane, PsycINFO, Scopus, JBI, Lilacs, and SciELO, completed in December 2022 and updated in November 2023. Critical appraisal was performed using the JBI checklist for randomized controlled trials, and a narrative synthesis process was used. Outcomes were categorized into …
Sexual Communication Patterns Of Heterosexual-Identified Men Who Have Sex With Men, Travis R. Scheadler, Megan W. Rowe, Salem Rao, Oliver W.J. Beer, Tyrone J. Curtis, Sandra Kwan, Shih Ju Claire Lung, Adam Busch, Daniel Vandervoort, Paul A. Shuper, Andrew D. Eaton
Sexual Communication Patterns Of Heterosexual-Identified Men Who Have Sex With Men, Travis R. Scheadler, Megan W. Rowe, Salem Rao, Oliver W.J. Beer, Tyrone J. Curtis, Sandra Kwan, Shih Ju Claire Lung, Adam Busch, Daniel Vandervoort, Paul A. Shuper, Andrew D. Eaton
School of Health Professions
The sexual communication patterns that comprise how heterosexual men with concordance between identity and behavior navigate their sexual encounters with women are well-established. Some heterosexual men experience discordance between their sexual identities and behaviors and may have unique practices of sexual communication, but this has not been studied. Knowledge of their sexual communication practices is an important step toward understanding and improving their sexual experiences. Therefore, semi-structured interviews were conducted with 11 heterosexual-identified men who have sex with men to learn more about their sexual communication strategies. Three themes were identified through interpretative phenomenological analysis: meeting sex partners, clear communication …
Interventions For Promoting Physical Activity In People With Newly Diagnosed Parkinson’S Disease: Scoping Review, Jonathan Gilby, Bridie Kent, Rachel Knight Lozano, Jonathan Marsden
Interventions For Promoting Physical Activity In People With Newly Diagnosed Parkinson’S Disease: Scoping Review, Jonathan Gilby, Bridie Kent, Rachel Knight Lozano, Jonathan Marsden
School of Health Professions
Background: There is increasing evidence to suggest that physical activity can slow Parkinson’s progression. There is also increasing interest in non-pharmacological interventions to alleviate Parkinson’s symptoms. This scoping review aimed to map and describe the evidence for interventions that promote physical activity in people with newly diagnosed Parkinson’s. Methods: Studies conducted since 2011, on adults with Parkinson’s (≥ 18 years), investigating the effects of non-pharmacological interventions to promote physical activity and/or exercise were considered. Interventions needed to be conducted in healthcare or healthcare-related settings for people within 5 years of Parkinson’s diagnosis. Published or unpublished full-text articles since 2011 were …
Tactile Kinaesthetic Methods Without Abdominal Pressure Promoting Gastrointestinal Passage In Preterm Infants: A Scoping Review, Natalie Hurst, Jos M. Latour, Christian F. Poets, Christoph E. Schwarz
Tactile Kinaesthetic Methods Without Abdominal Pressure Promoting Gastrointestinal Passage In Preterm Infants: A Scoping Review, Natalie Hurst, Jos M. Latour, Christian F. Poets, Christoph E. Schwarz
School of Nursing and Midwifery
Background: Tactile kinaesthetic stimulation (TKS) might support enteral feeding and meconium excretion in preterm infants, but volvulus has been linked to abdominal massage. Aim: To map the evidence and to identify knowledge gaps on TKS in preterm infants. Methods: A scoping review was conducted in August 2024 using four databases. Results: Ten studies (totaling 268 infants weighing 1000–2500g at birth) met inclusion criteria. All studies utilized whole-body TKS, involving stroking and movement with moderate to gentle pressure, administered 1 to 3 times daily by staff. Starting TKS in the first days of life seemed to improve meconium excretion, while later …
‘The Transition Home With A Premature Baby’: How Prepared Are Parents For Discharge From Nicu: A Narrative Review, Beth Taylor, Kevin Hambridge
‘The Transition Home With A Premature Baby’: How Prepared Are Parents For Discharge From Nicu: A Narrative Review, Beth Taylor, Kevin Hambridge
School of Nursing and Midwifery
Aims: To systematically review qualitative studies, investigating how prepared parents are for discharge home from NICU with their premature baby. Design: A qualitative narrative review and thematic synthesis of selected qualitative research evidence. Data sources: Searches were found between December 2022 and March 2023. Electronic databases (CINAHL, PsycINFO, PUBMED, Science Direct) were used. Additionally, Google Scholar for grey literature. Studies were searched within the ten-year time frame. Review methods: Seven primary studies met the inclusion criteria and were appraised for quality using the Critical Appraisal Skills Program tool. Qualitative data was collected, therefore creating a thematic synthesis. Results: Seven qualitative …
Hydrogen Permeation In Iron-Chromium-Aluminum (Fecral) Alloys And The Effects Of Microstructure And Surface Oxide, Nathan T. Gehmlich, Thomas F. Fuerst, Hanns Gietl, Chase N. Taylor, Joshua Rittenhouse, Haiming Wen, M. Nedim Cinbiz
Hydrogen Permeation In Iron-Chromium-Aluminum (Fecral) Alloys And The Effects Of Microstructure And Surface Oxide, Nathan T. Gehmlich, Thomas F. Fuerst, Hanns Gietl, Chase N. Taylor, Joshua Rittenhouse, Haiming Wen, M. Nedim Cinbiz
Materials Science and Engineering Faculty Research & Creative Works
Iron–chromium–aluminum (FeCrAl) class alloys are candidates for use as cladding for accident-tolerant fuels and moderators. In this context, hydrogen isotope permeation in FeCrAl alloys is an important material property. In the present work, the apparent permeability, effective diffusivity, and apparent solubility of hydrogen in the FeCrAl alloys C26M and Kanthal D (KD) were measured with gas-driven hydrogen permeation. Permeation measurements were conducted at temperatures of 400 to 700 °C and at gas-driven pressures from 1 to 100 kPa. In particular, the effect of grain size on hydrogen transport was studied with KD samples with three different microstructures: nanocrystalline (NC), ultra-fine …
Dual-Bed Radioiodine Capture From Complex Gas Streams With Zeolites: Regeneration And Reuse Of Primary Sorbent Beds For Sustainable Waste Management, Krista Carlson, Brian J. Riley, Joshua Turner, David C. Cantu, Dev Chidambaram, Charmayne Lonergan, Jeffrey D. Rimer
Dual-Bed Radioiodine Capture From Complex Gas Streams With Zeolites: Regeneration And Reuse Of Primary Sorbent Beds For Sustainable Waste Management, Krista Carlson, Brian J. Riley, Joshua Turner, David C. Cantu, Dev Chidambaram, Charmayne Lonergan, Jeffrey D. Rimer
Materials Science and Engineering Faculty Research & Creative Works
No abstract provided.
Degradation Of Radioactive Waste Encapsulation Of Bao−Feox−P2o5 Glass Evaluated From Electrical Conductivity, Kazuki Mitsui, Nobuyasu Nishioka, Hiromichi Takebe, Richard K. Brow, Akira Saitoh
Degradation Of Radioactive Waste Encapsulation Of Bao−Feox−P2o5 Glass Evaluated From Electrical Conductivity, Kazuki Mitsui, Nobuyasu Nishioka, Hiromichi Takebe, Richard K. Brow, Akira Saitoh
Materials Science and Engineering Faculty Research & Creative Works
We report on the electrical conductivity of barium iron phosphate glass, a candidate for radioactive waste encapsulating glass. The glass composition has been optimized for slow dissolution in hot water because the precipitation of a stable hydration layer of FeO(OH) on the glass surface enhances the water durability of the glass. The mechanism of electrical conductivity of the glass is assumed to be an electron hopping between the electronic energy levels of Fe (II) and Fe (III) ions, obeying the electron carrier generation of Fe (II) → Fe (III) + e−. The electrical conductivity of the base glass was ∼3.2 …
Understanding Heterogeneous Nucleation In Iron Alloys From First Principles: A Review And Discussion, Semen Naumovich Lekakh
Understanding Heterogeneous Nucleation In Iron Alloys From First Principles: A Review And Discussion, Semen Naumovich Lekakh
Materials Science and Engineering Faculty Research & Creative Works
Heterogeneous nucleation during solidification plays a key role in structure formation of different types of iron-based alloys, including steels and cast irons. A review summarizes the novel theoretical methods which were used to understand the nature of heterogeneous nucleation in iron-based alloys. An ab initio simulation of atomic adsorption was used to predict the activity of heterogeneous nuclei, and the thermodynamic methods were applied to design conditions for desired precipitate formation in the iron melts. A high-resolution TEM study of individual nucleus and statistics of nuclei family, obtained from an automated SEM/EDX analysis, illustrates a possibility to design processes of …
Ground Testing Of A Magnetic-Electrostatic Separation System For Lunar Regolith Beneficiation, Peter Bachle, Charles Wood, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han
Ground Testing Of A Magnetic-Electrostatic Separation System For Lunar Regolith Beneficiation, Peter Bachle, Charles Wood, Jeffrey Smith, Fateme Rezaei, David Bayless, William Schonberg, Daoru Han
Materials Science and Engineering Faculty Research & Creative Works
The separation of lunar regolith by mineral composition and size category is useful forin-situ resource utilization (ISRU). The research presented herein discusses the designing and development of equipment that has the potential to separate lunar regolith into aluminum, iron-titanium, and magnesium-iron ores. Along with the metal ore separation, this equipment shows the potential to separate regolith by size categories. The combined effect of these separation methods generates output that is valuable to subsequent use in metal and oxygen extraction, additive manufacturing, and regolith sintering processes. The designed equipment uses a dual-strength magnet system with N42 and N52 neodymium magnets for …
The Effect Of Carbon Equivalent And Nodularity On Multi-Axial Casting Wall Movement During Spheroidal Graphite Iron Solidification And Cooling, Noah J. Brack, Mingzhi Xu, Jingjing Qing, Simon Lekakh
The Effect Of Carbon Equivalent And Nodularity On Multi-Axial Casting Wall Movement During Spheroidal Graphite Iron Solidification And Cooling, Noah J. Brack, Mingzhi Xu, Jingjing Qing, Simon Lekakh
Materials Science and Engineering Faculty Research & Creative Works
Spheroidal graphite iron, also known as ductile iron, is an iron–carbon casting alloy used in industry for its good castability, balanced mechanical properties, and low cost. Ductile iron consists of round graphite nodules in an iron matrix. During solidification and cooling, ductile iron castings experience dynamic volume changes due to the precipitation of graphite nodules and formation of austenite. These dynamic volume changes can distort external casting surfaces, causing swell and shrinkage porosity. A novel apparatus was custom-built to capture the casting wall movement in real time along three axes. This study found that casting expansion increased with carbon equivalent …
Controlling Nitrogen Pickup During Induction Melting Of Ultrahigh-Strength Cr-Ni-Mo-V Steels, Kingsley T. Amatanweze, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field
Controlling Nitrogen Pickup During Induction Melting Of Ultrahigh-Strength Cr-Ni-Mo-V Steels, Kingsley T. Amatanweze, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field
Materials Science and Engineering Faculty Research & Creative Works
Nitrogen pickup during air induction melting can result in porosity and a loss of fracture toughness in ultrahigh-strength quenched and tempered steel castings. Nitrogen atoms are easily adsorbed into liquid steel upon exposure to the air, and argon shrouding alone has limited effectiveness. Previous studies have shown that proper charge sequencing and maintaining a high amount of dissolved oxygen in the melt prior to tapping and deoxidation can limit nitrogen pickup in the melt. In the current study, the effect of melt practice and charging procedure on nitrogen pickup was studied as a function of hold time in a series …
Zrc Particle Size Effect On The Mechanical Properties Of Spark Plasma Sintered 60–40 Vol% Zrc–Mo Cermets, Nathaniel Blatt, Jeremy Watts, Brian Taylor, Jhonathan Rosales, Gregory Hilmas
Zrc Particle Size Effect On The Mechanical Properties Of Spark Plasma Sintered 60–40 Vol% Zrc–Mo Cermets, Nathaniel Blatt, Jeremy Watts, Brian Taylor, Jhonathan Rosales, Gregory Hilmas
Materials Science and Engineering Faculty Research & Creative Works
Cermet's of 60 vol% ZrC and 40 vol% Mo with different starting ZrC particle sizes were spark plasma sintered to full density at 1950 °C. Elastic moduli, Vickers hardness and fracture toughness were measured at room temperature and flexural strength was measured up to 1600 °C. Young's modulus was 365 ± 5 GPa, shear modulus was 149 ± 2 GPa, Poisson's ratio was 0.22 ± 0.01, and no significant difference was observed for the moduli with respect to the starting ZrC particle size. Room temperature flexural strength was affected by the ZrC particle size, measured as ∼524 and ∼598 MPa …
Parametric Analysis Of Water Jet Descaling Efficiency Of Reheated Continuously Cast Thin Slab, Tochukwu P. Ojiako, Mario F. Buchely, Simon Lekakh, Ronald J. O'Malley, Richard Osei, Taha Tayebali
Parametric Analysis Of Water Jet Descaling Efficiency Of Reheated Continuously Cast Thin Slab, Tochukwu P. Ojiako, Mario F. Buchely, Simon Lekakh, Ronald J. O'Malley, Richard Osei, Taha Tayebali
Materials Science and Engineering Faculty Research & Creative Works
Efficient oxide scale removal is critical for maintaining surface quality and process efficiency in steel manufacturing. This study optimizes water jet descaling by evaluating the performance of flat and rotary jet nozzles under varying process parameters. Using a combined approach of experimental analysis and computational fluid dynamics, it investigates the influence of pressure (138–275 bar), lead angle (0°, 15°, 25°), working distance (50–100 mm), and spray angle (15°–25°) on descaling efficiency. Findings indicate that flat jet nozzles achieve superior performance at short working distances due to concentrated impact forces, while rotary jet nozzles sustain efficiency over extended distances through dynamic …
Effect Of Gating Design On Filling And Inclusion Control In An Al-Killed Cr-Mo-Ni Steel, Kingsley T. Amatanweze, Koushik Balasubramanian, Soumava Chakraborty, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field, Krista R. Limmer, Katherine M. Sebeck
Effect Of Gating Design On Filling And Inclusion Control In An Al-Killed Cr-Mo-Ni Steel, Kingsley T. Amatanweze, Koushik Balasubramanian, Soumava Chakraborty, Viraj A. Athavale, Mario F. Buchely, Laura N. Bartlett, Ronald J. O'Malley, Daniel M. Field, Krista R. Limmer, Katherine M. Sebeck
Materials Science and Engineering Faculty Research & Creative Works
The effect of gating system design on the inclusion population and size distribution in an aluminum-killed low-alloy advanced high strength steel casting was studied. A mold with four different gating systems: pressurized and non-pressurized with side risers, naturally pressurized with a side riser, and naturally pressurized with a top riser, was designed using computational fluid dynamics and solidification software. The design allowed inclusion populations in castings produced with each gating system to be compared during the same pouring event. Samples taken from different positions just below the top surface of each casting were analyzed using an SEM/EDS system with automated …
High-Temperature Performance Of Alloyed Cast Irons And Cr/Ni Austenitic Steels—An Overview And Discussion, Simon N. Lekakh, Mei Li, Larry Godlewski
High-Temperature Performance Of Alloyed Cast Irons And Cr/Ni Austenitic Steels—An Overview And Discussion, Simon N. Lekakh, Mei Li, Larry Godlewski
Materials Science and Engineering Faculty Research & Creative Works
Fe-based cast alloys, including cast irons and steels, have been used in service at a wide range of mechanical and thermal load in oxidizing environment. Special alloying practices can be used to improve high temperature performance of Fe-based cast alloys in an oxidizing atmosphere. At elevated temperatures, alloying elements can produce a protective interface layer which prevents oxidant penetration into the metal matrix. However, a combination of thermo-mechanical loads along with surface oxidation can decrease the materials integrity by destroying the stable protected interface limiting the range of working parameters and lifetime performance of the material. This overview aims to …
Ultrafast Belite (Β-C2s) Production Using Biofuel-Based Combustion Synthesis, Shubham Agrawal, Sayee Srikarah Volaity, Oluwadamilare Charles Adesina, Bryan K. Aylas-Paredes, Taihao Han, Srinivas Kilambi, Aditya Kumar, Narayanan Neithalath
Ultrafast Belite (Β-C2s) Production Using Biofuel-Based Combustion Synthesis, Shubham Agrawal, Sayee Srikarah Volaity, Oluwadamilare Charles Adesina, Bryan K. Aylas-Paredes, Taihao Han, Srinivas Kilambi, Aditya Kumar, Narayanan Neithalath
Materials Science and Engineering Faculty Research & Creative Works
This study presents a novel low-temperature, combustion synthesis (CS) approach for the rapid production of belite-rich cements. CS leverages the exothermic heat released from the combustion of biofuels such as lignin and/or biomass, intermixed with pelletized limestone and quartz. At an imposed furnace temperature of ∼700°C (as opposed to 1200°C–1300°C required in a conventional kiln), the source materials are rapidly transformed to belite, resulting in energy, emissions, and economic benefits. This work explores the influence of various process parameters, viz., fuel types and contents, airflow rate, porosity, holding temperature, and holding time on the efficiency of CS-based belite synthesis. Through …
Flexural Strength Of (Hf,Nb,Ta,Ti,Zr)B2–(Hf,Nb,Ta,Ti,Zr)C High-Entropy Dual-Phase Ceramics, Rubia Hassan, William G. Fahrenholtz, Gregory E. Hilmas, Jeremy Watts
Flexural Strength Of (Hf,Nb,Ta,Ti,Zr)B2–(Hf,Nb,Ta,Ti,Zr)C High-Entropy Dual-Phase Ceramics, Rubia Hassan, William G. Fahrenholtz, Gregory E. Hilmas, Jeremy Watts
Materials Science and Engineering Faculty Research & Creative Works
The room and elevated temperature flexural strengths were measured for (Hf,Nb,Ta,Ti,Zr)B2–(Hf,Nb,Ta,Ti,Zr)C high-entropy dual-phase ceramics. The fracture of ceramics originated from two distinct flaw populations that were either surface defects introduced during specimen preparation or volume defects introduced during processing. The average strength at room temperature was 638 ± 94 MPa with individual bars strengths as high as ∼800 MPa. At 1800°C, average strength increased to 786 ± 265 MPa with individual bar strengths as high as ∼1050 MPa. Above 1800°C, creep dominated resulting in deformation of the bars without fracture. The fracture mode changed from completely trans granular at room …