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Articles 38191 - 38220 of 39876
Full-Text Articles in Entire DC Network
Hydrothermal Behavior Of A Novel Conical Twisted Strip Turbulator In A Heated Tube: A Numerical Analysis, Azher M. Abed, Bhavesh Kanabar, T. Ramachandran, Aman Shankhyan, Jasgurpreet Singh Chohan, A. Karthikeyan, Deepak Gupta, Bashir Salah, Waqas Saleem
Hydrothermal Behavior Of A Novel Conical Twisted Strip Turbulator In A Heated Tube: A Numerical Analysis, Azher M. Abed, Bhavesh Kanabar, T. Ramachandran, Aman Shankhyan, Jasgurpreet Singh Chohan, A. Karthikeyan, Deepak Gupta, Bashir Salah, Waqas Saleem
Research Outputs: 2025-Present
The increasing use of heated pipes and heat exchangers has created a pressing need to enhance thermal efficiency. This research introduces a novel turbulator design known as the conical twisted strip turbulator. The turbulator design resembles a cone and is composed of several twisted strip tentacles. This unique configuration is expected to generate strong rotational and radial flow patterns, leading to enhanced heat transfer. A numerical analysis was conducted using the RNG k-epsilon model to investigate various geometric parameters of the turbulator. The study examined the twisted angle, which varied from 60 to 270°, the number of twisted strip tentacles, …
Aspen Plus Modelling Of The Milena Dual Fluidised Bed Biomass Gasifier Technology, Mohadeseh Naderi, Hamid Rashidi, Anthony Reynolds, Wayne Doherty
Aspen Plus Modelling Of The Milena Dual Fluidised Bed Biomass Gasifier Technology, Mohadeseh Naderi, Hamid Rashidi, Anthony Reynolds, Wayne Doherty
Research Outputs: 2025-Present
The Energy Research Centre of The Netherlands is developing MILENA gasification technology to convert biomass fuels into high-value gaseous and liquid products. MILENA is a steam-blown dual fluidised bed (DFB) gasification process with separate gasification and combustion zones. This DFB gasifier produces high-quality gas with low N2 content suitable for vehicle fuel or natural gas grid injection. This study presents a semi-kinetic Aspen Plus model for MILENA gasification, including stages like drying, rapid pyrolysis, gasification, combustion, and tar cracking and reforming. Pyrolysis as a key step, was modelled using experimental data for the rapid pyrolysis of wood to calculate …
Tailoring Innovative Silver Nanoparticles For Modern Medicine: The Importance Of Size And Shape Control And Functional Modifications, Ibtissam Laib, Noura Gheraissa, Abir Benaissa, Latra Benkhira, Manel Azzi, Yousef Benaissa, Ahmed G. Abdelaziz, Furong Tian, Maureen Walsh, Mikhael Bechelany, Ahmed Barhoum
Tailoring Innovative Silver Nanoparticles For Modern Medicine: The Importance Of Size And Shape Control And Functional Modifications, Ibtissam Laib, Noura Gheraissa, Abir Benaissa, Latra Benkhira, Manel Azzi, Yousef Benaissa, Ahmed G. Abdelaziz, Furong Tian, Maureen Walsh, Mikhael Bechelany, Ahmed Barhoum
Research Outputs: 2025-Present
Silver nanoparticles (Ag NPs) play a significant role in modern medicine, with their size, shape, and surface chemistry strongly influencing their biological performance. Smaller nanoparticles (1–100 nm) can penetrate cells more easily, while different shapes such as spheres, rods, cubes, triangles, wires, and stars impact their antimicrobial activity and drug delivery efficiency. This review highlights the importance of precise control over these properties during synthesis to optimize their therapeutic potential. Green synthesis methods, including plant-based and microbial approaches, are presented as safer, more cost-effective, and environmentally friendly alternatives to conventional chemical processes. The review also discusses surface functionalization strategies such …
A Systematic Review Of The Use Of Electronic Nose And Tongue Technologies For Detecting Food Contaminants, Muhammad Zia Ul Haq, Baljit Singh, Xolile Fuku, Ahmed Barhoum, Furong Tian
A Systematic Review Of The Use Of Electronic Nose And Tongue Technologies For Detecting Food Contaminants, Muhammad Zia Ul Haq, Baljit Singh, Xolile Fuku, Ahmed Barhoum, Furong Tian
Research Outputs: 2025-Present
Sensor operations in the food industry are faced with several major challenges, including in sensitivity, selectivity, accuracy and rapid detection. Among emerging technologies, e-nose and e-tongue systems have attracted much attention from researchers. This review examines 112 studies published from 2004 to 2025, and examines the functionalities and performance in detecting various food product-associated analytes. The sensitivity of e-nose and e-tongue systems was analyzed using various data processing techniques. Recent research and development in leading countries (i.e., China, United Kingdom, Columbia, India, Portugal, Spain, Hungary, Ireland) was examined. The findings indicate that principal component analysis (PCA) was the most widely …
Smartphone Authentication Based On 3d Touch Sensor And Finger Locations On Touchscreens Via Decision-Making Techniques, Moceheb Lazam Shuwandy, Rawan Adel Fawzi Alsharida, Maytham M. Hammood
Smartphone Authentication Based On 3d Touch Sensor And Finger Locations On Touchscreens Via Decision-Making Techniques, Moceheb Lazam Shuwandy, Rawan Adel Fawzi Alsharida, Maytham M. Hammood
Mesopotamian Journal of CyberSecurity
Smartphone authentication systems must balance security and user convenience, which is a persistent challenge in the digital realm. Traditional biometrics, such as fingerprints and facial recognition, face vulnerabilities to spoofing and environmental conditions, limiting reliability. This study introduces a novel approach by integrating three-dimensional (3D) touch sensors with finger location data for authentication. The goal is to develop a system that improves accuracy while minimizing false positives and negatives, leveraging touch pressure and spatial interaction as unique biometric identifiers. Data from 20 participants, including pressure levels, spatial coordinates, and timestamps, were analysed using Random Forest (RF) and Extreme Gradient Boosting …
Between Belief Belonging: Filipino Atheists’ Lived Experiences Of Cultural Negotiation, Prince Kennex R. Aldama
Between Belief Belonging: Filipino Atheists’ Lived Experiences Of Cultural Negotiation, Prince Kennex R. Aldama
Journal Article
This study explores the lived experiences of Filipino atheists and how they negotiate traditional Filipino values in a predominantly religious society. Using a phenomenological thematic analysis, it draws on in-depth semi-structured interviews with seven self-identified Filipino atheists. The study examines how participants interpret and navigate values such as pakikisama (smooth interpersonal relations), utang na loob (debt of gratitude), hiya (propriety or shame), and kapwa (shared identity). Findings show that Filipino atheists do not reject these values outright but reinterpret them through secular moral frameworks grounded in empathy, responsibility, and relational care. Participants maintain social belonging through selective disclosure, pragmatic accommodation, …
Game-Based Recruitment Assessment, Hafsa Nasir, Maira Munir, Zara Mahroyan Kashif, Abdul Rafay, Zarlish Mohtasham
Game-Based Recruitment Assessment, Hafsa Nasir, Maira Munir, Zara Mahroyan Kashif, Abdul Rafay, Zarlish Mohtasham
BSCS Final Year Projects
The primary objective of our project is to develop a game-based recruitment system that modernizes traditional personality assessments by making them more engaging, adaptive, and relevant by incorporating real scenarios. We began by examining established models such as the Myers-Briggs Type Indicator (MBTI) and the Big Five personality traits. While these tools provide meaningful psychological insights, their formats are too lengthy, and repetitive. To address this, we selected approximately 20 questions most relevant to workplace behavior and hiring decisions and imitated the scoring process of the MBTI questionnaires. This not only shortens the assessment process but also improves candidate engagement. …
Etl/Elt Pipeline – Dataflow, Huzaifa Bin Tariq, Sameed Khatri, Hazim Ghulam Farooq, Ammar Lokhandwala, Kunal Kumar
Etl/Elt Pipeline – Dataflow, Huzaifa Bin Tariq, Sameed Khatri, Hazim Ghulam Farooq, Ammar Lokhandwala, Kunal Kumar
BSCS Final Year Projects
Today’s organizations deal with huge amounts of data every day, and they need efficient systems to move, clean, and organize that data for analysis. But in many cases, the data pipelines in place are rigid and overloaded with manual coding and scripting. This not only makes the process slow and tedious but also leaves room for inefficiencies and delays. Our project introduces a Hybrid ETL/ELT Data Processing Pipeline that provides manual control with intelligent recommendations. The system analyzes metadata such as data size, structure, and transformation complexity to recommend the best strategy (ETL or ELT), while users retain full control …
The Right Of Big Tech Companies To Issue Money In The Opinion Of Consumers From France And Germany, Robert Huterski
The Right Of Big Tech Companies To Issue Money In The Opinion Of Consumers From France And Germany, Robert Huterski
Journal of Banking and Financial Economics
With a vast customer base and the acquisition of information about their customers and their preferences in connection with their services, Big Tech companies are also becoming essential players in the financial sphere. Payment solutions offered by Big Tech companies, such as Google Pay or Alipay, familiarise consumers with the presence of such companies in the monetary sphere. The issuance of private money has the most excellent chance in a form regulated by public authorities and with a value stabilized to the national currency, regardless of whether it would be similar to narrow banking, synthetic CBDC or another, related form. …
Personal Characteristics And Retirement Intentions (Empirical Evidence From Poland), Patrycja Kowalczyk-Rólczyńska, Madgalena Swacha-Lech, Łukasz Jurek
Personal Characteristics And Retirement Intentions (Empirical Evidence From Poland), Patrycja Kowalczyk-Rólczyńska, Madgalena Swacha-Lech, Łukasz Jurek
Journal of Banking and Financial Economics
Retirement intentions depend on a number of different factors. The aim of this paper is to assess the impact of personal characteristics on the willingness to retire as soon as possible among older workers in Poland. The data were collected through a CAWI survey conducted in 2021 among a representative sample of workers aged 50 and over. Statistical analysis was based on logit model. Identified predictors are: age, education, fear about the financial situation in retirement, the use of free time after retirement, and lack time to pursue passions due to work. Those results provide suggestions for strengthening active ageing …
Exploring The Link Between Hy Wet Ball Mill Work Index And Grinding Energy Consumption, Chen Peng, Hou Ying, Lv Hongxu, Sobhy Ahmed
Exploring The Link Between Hy Wet Ball Mill Work Index And Grinding Energy Consumption, Chen Peng, Hou Ying, Lv Hongxu, Sobhy Ahmed
Mining Engineering Faculty Research & Creative Works
In evaluating ore grinding energy consumption using the Bond ball mill work index, discrepancies were identified. As a result, an investigation into the determination method of Hou Ying (HY) wet ball milling work index (WHY) for Gongchangling magnetite ore was conducted to determine the correlation between WHY and grinding energy consumption at varying particle sizes. The research results indicated that WHY had an error less than 3.33%, which is closely aligned with on-site grinding energy consumption. This surpassed the numerical error of 15.9% in the Bond ball grinding power index and demonstrated superior accuracy in representing ore grinding energy consumption, …
Towards A Sustainable Public Transport: Finding A Niche To Build Electric Vehicle Industry, Majah-Leah V. Ravago, Renzi G. Frias
Towards A Sustainable Public Transport: Finding A Niche To Build Electric Vehicle Industry, Majah-Leah V. Ravago, Renzi G. Frias
Economics Department Faculty Publications
Concerns about climate change and the environment have shifted the spotlight to electric vehicles (EVs) as a critical component of sustainable transport. However, its diffusion has been slow in developing countries, especially in the public transport sector. We take the Philippines’ case to show that no one size fits all. For environmental, social and political reasons, the jeepney sector offers a promising niche for the Philippines to develop its EV industry. We use the socio-economic cost-benefit analysis to determine the feasibility of gradually replacing traditional jeepneys with e-jeepneys in various scenarios. Our analysis includes the avoided carbon costs and health …
Ultrathin Film Coating And Element Doping For Lithium-Ion Battery Electrodes, Xinhua Liang, Yan Gao
Ultrathin Film Coating And Element Doping For Lithium-Ion Battery Electrodes, Xinhua Liang, Yan Gao
Patents
The present invention relates to various lithium ion battery cathodes as well as lithium ion batteries incorporating one or more of these cathodes. The present invention further relates to processes of preparing the lithium ion battery cathode.
Incremental Cluster Validity Index-Based Offline Clustering For Machine Learning, Leonardo Enzo Brito Da Silva, Donald C. Wunsch Ii, Nagasharath Rayapati
Incremental Cluster Validity Index-Based Offline Clustering For Machine Learning, Leonardo Enzo Brito Da Silva, Donald C. Wunsch Ii, Nagasharath Rayapati
Patents
A neural network model replaces the supervised labeling component of a supervised learning system with an incremental cluster validity index-based unsupervised labeling component. An implementation is presented combining fuzzy adaptive resonance theory predictive mapping (ARTMAP) and incremental cluster validity indices (iCVI) for unsupervised machine learning purposes, namely the iCVIARTMAP. An iCVI module replaces the adaptive resonance theory (ART) module B of a fuzzy ARTMAP neural network model and provides assigmnents of input samples to clusters (i.e., labels) at each learning iteration in accordance to any of several possible iCVI methods described. A map field incrementally builds a many-to-one mapping of …
Mobile Robot Configured To Determine Human Arm Stiffness During Overground Interaction, Sambad Regmi, Yun Seong Song
Mobile Robot Configured To Determine Human Arm Stiffness During Overground Interaction, Sambad Regmi, Yun Seong Song
Patents
A mobile robot system and method for determining the stiffness of a human arm while moving with a user during overground interaction as the user holds the robot's handle and exchanges forces with it. A mobile base moves with the user, a robot arm interacts with the user, and a controller determines the stiffness. The robot arm includes servomotors driving a linkage mechanism, an end effector including the handle supported by the linkage mechanism, and a force transducer measuring a force applied by the user to the handle. The controller causes the robot arm to generate a force perturbation at …
Additively-Manufactured Structure For Reactionary Processes, Fateme Rezaei, Ali Rownaghi, Shane Lawson
Additively-Manufactured Structure For Reactionary Processes, Fateme Rezaei, Ali Rownaghi, Shane Lawson
Patents
A method of additively manufacturing a structure for use in a reactionary process includes forming a material from metal or metal oxide particles, a dispersion solvent, and a binder. The method also includes depositing the material onto a build platform and curing the material to form a structure for use in a reactionary process. The structure includes the metal or metal oxide particles and is configured to provide a reaction when exposed to a reactant.
Unmanned Vehicle Having Flight Configuration And Surface Traverse Configuration, Genda Chen, Alec Reven, Bo Shang, Zenhua Shi, Liujun Li, Boyang Li
Unmanned Vehicle Having Flight Configuration And Surface Traverse Configuration, Genda Chen, Alec Reven, Bo Shang, Zenhua Shi, Liujun Li, Boyang Li
Patents
An unmanned vehicle includes a body, at least one power source coupled to the body, a flight propulsion system coupled to the at least one power source and configured to propel the unmanned vehicle through air, and a surface propulsion system coupled to the at least one power source and configured to propel the unmanned vehicle along a surface. The unmanned vehicle is configured to switch between a flight configuration in which the unmanned vehicle is propelled through air via the flight propulsion system, and a surface traverse configuration in which the unmanned vehicle is propelled along the surface via …
Energy Dissipation Using Negative Stiffness Shells, Mohamed El-Gawady, Yasser Darwish
Energy Dissipation Using Negative Stiffness Shells, Mohamed El-Gawady, Yasser Darwish
Patents
A negative stiffness shell has a convex first position, but can transition or snap to a concave second position under a force applied to the exterior surface of the shell in the convex first position. During the transition, the shell exhibits negative stiffness that permits a large amount of energy to be absorbed. The negative stiffness shell can withstand a high initial force threshold prior to transitioning. In the second, concave position the shell can still resist force. Moreover, it is possible for the shell to revert back to the first, convex position with minimal plastic deformation for subsequent use. …
Large-Scale Carbon-Mineralization Through Oxalatization, Hongyan Ma, Wenyu Liao
Large-Scale Carbon-Mineralization Through Oxalatization, Hongyan Ma, Wenyu Liao
Patents
The present invention is broadly concerned with mineralization methods that assist in permanent carbon storage. The methods provide a storage mechanism for oxalic acid generated by existing or future-developed carbon capture and conversion methods that convert CO2 to oxalic acid. That oxalic acid can be injected into a subsurface rock formation containing non-carbonate rock to form oxalates or oxalate hydrates. Alternatively, oxalic acid can be mixed with mine tailings, well drilling dirt, crushed rocks, etc., that contain desired non-carbonate rock minerals, to promote mineralization.
Nontoxic High Temperature Resistant Hydrogels, Thomas P. Schuman, Baujun Bai, Buddhabhushan Pundlik Salunkhe
Nontoxic High Temperature Resistant Hydrogels, Thomas P. Schuman, Baujun Bai, Buddhabhushan Pundlik Salunkhe
Patents
Compositions of swellable non-toxic hydro gels and their use in conformance control are described herein. More specifically, the present invention generally relates to the hydro gels compositions that can be used to treat the oil reservoirs having high temperature and high salinity conditions. The compositions generally comprise a plurality of swellable particles having one or more crosslinkers interspersed within a polymer matrix. The compositions can also be used in biomedical, agricultural, fracking and similar applications wherein thermally-stable, nontoxic hydrogels are required.
An Assessment Of The Dietary Bioavailability Of Tio2 And Inorganically Carbon-Based Nanomaterials In Rainbow Trout, Using The Ex Vivo Gut Sac Technique And A In Chemico Digestibility Assay, Craig Mchardy
School of Biological and Marine Sciences Theses
Abstract. Craig McHardyAn assessment of the dietary bioavailability of TiO2 and inorganically carbon-based nanomaterials in rainbow trout, using the ex vivo gut sac technique and a in chemico digestibility assay.Carbon based engineered nanomaterials (ENMs) are an emerging contaminant within modern society, as such their environmental risk assessment is of high importance. Testing for their persistence, toxicity and bioaccumulation potential is important for regulatory bodies to fully understand the hazard posed. To date, data on the bioaccumulation potential of these ENMs is lacking, especially within fish. A tiered approach to bioaccumulation testing has been posed in which precursory tests such as …
Technology As The Sovereign: A Dual-Path Model Of Managers’ Prioritization Of Technical Tasks, Hesheng Huang
Technology As The Sovereign: A Dual-Path Model Of Managers’ Prioritization Of Technical Tasks, Hesheng Huang
Dissertations and Theses Collection (Open Access)
Competitive pressures challenge managers to navigate a multitude of responsibilities. On the basis of Vancouver and colleagues’ (Vancouver et al., 2010; Ballard et al., 2016) multiple-task pursuit framework, Sherf, Venkataramani, and Gejendran (2019) theorized that when faced with competition between technical tasks (e.g., getting things done, meeting assigned goals, promoting quality or accuracy of work, satisfying customer demands, and fulfilling technical responsibilities) and justice tasks (e.g., evaluating employees’ performance, recognizing employees’ achievements, and allocating rewards), managers tend to prioritize technical tasks over justice tasks under high workload demands. On this basis, I aim to examine a model that encompasses the …
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 …