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Dynamic Equations, Control Problems On Time Scales, And Chaotic Systems, Martin Bohner Mar 2023

Dynamic Equations, Control Problems On Time Scales, And Chaotic Systems, Martin Bohner

Mathematics and Statistics Faculty Research & Creative Works

The unification of integral and differential calculus with the calculus of finite differences has been rendered possible by providing a formal structure to study hybrid discrete-continuous dynamical systems besides offering applications in diverse fields that require simultaneous modeling of discrete and continuous data concerning dynamic equations on time scales. Therefore, the theory of time scales provides a unification between the calculus of the theory of difference equations with the theory of differential equations. In addition, it has become possible to examine diverse application problems more precisely by the use of dynamical systems on time scales whose calculus is made up …

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Investigation Of Corrosion Mechanism Of Ribbed Mild Steel Bars Coated With Magnesium Potassium Phosphate Cement Paste, Fan Zhang, John J. Myers, Wenyu Liao, Cun Hui, Hongyan Ma Mar 2023

Investigation Of Corrosion Mechanism Of Ribbed Mild Steel Bars Coated With Magnesium Potassium Phosphate Cement Paste, Fan Zhang, John J. Myers, Wenyu Liao, Cun Hui, Hongyan Ma

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

This Study Investigated the Anti-Corrosion Performance of Magnesium Potassium Phosphate Cement (MKPC) Paste Applied to the Surface of Ribbed Mild Steel Bars – Which Was Exposed to Simulated Accelerated Corrosive Environment. Four Electrochemical Approaches Were Used Including Open-Circuit Potential (OCP), Electrochemical Impedance Spectroscope (EIS), Polarization Resistance (PR) and Potentiodynamic Polarization (PDP) over a Period of 5376 H (224 Days). Moreover, Visual Inspection, Optical Microscope, and Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDS) Were Used to Assess the Extent of Corrosion on the Samples. to Understand the Mechanism of Corrosion Protection of the Coating System, X-Ray Photoelectron Spectroscopy (XPS) …

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Semi-Annual Progress Report #13, Missouri University Of Science And Technology Mar 2023

Semi-Annual Progress Report #13, Missouri University Of Science And Technology

Semi-Annual Progress Reports

No abstract provided.

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Core-Periphery Principle Guided Redesign Of Self-Attention In Transformers, Xiaowei Yu, Lu Zhang, Haixing Dai, Yanjun Lyu, Lin Zhao, Zihao Wu, David Liu, Tianming Liu, Daijiang Zhu Mar 2023

Core-Periphery Principle Guided Redesign Of Self-Attention In Transformers, Xiaowei Yu, Lu Zhang, Haixing Dai, Yanjun Lyu, Lin Zhao, Zihao Wu, David Liu, Tianming Liu, Daijiang Zhu

Computer Science Faculty Research & Creative Works

Designing more efficient, reliable, and explainable neural network architectures is critical to studies that are based on artificial intelligence (AI) techniques. Numerous efforts have been devoted to exploring the best structures, or structural signatures, of well-performing artificial neural networks (ANN). Previous studies, by post-hoc analysis, have found that the best-performing ANNs surprisingly resemble biological neural networks (BNN), which indicates that ANNs and BNNs may share some common principles to achieve optimal performance in either machine learning or cognitive/behavior tasks. Inspired by this phenomenon, rather than relying on post-hoc schemes, we proactively instill organizational principles of BNNs to guide the redesign …

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Probability Of Detection In Structural Health Monitoring, Genda Chen Mar 2023

Probability Of Detection In Structural Health Monitoring, Genda Chen

INSPIRE Archived Webinars

The fundamental concept of the probability of detection in structural health monitoring is introduced. The traditional Probability of Detection (POD) method as described in the Department of Defense Handbook MIL-HDBK-1823A for nondestructive evaluation systems does not take the time dependency of data collection into account. When applied to in-situ sensors for the measurement of flaw sizes, such as fatigue-induced crack length and corrosion-induced mass loss, the validity and reliability of the traditional method is unknown. In this 50-minute lecture, the POD for in-situ sensors and their associated reliability assessment for detectable flaw sizes are evaluated using a Flaw-Size-at-Detection (FSaD) method …

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Nitrogen-Doped 4h Silicon Carbide Single-Crystal Electrode For Selective Electrochemical Sensing Of Dopamine, Fatemeh Fathi, Brandon Sueoka, Feng Zhao, Xiangqun Zeng Mar 2023

Nitrogen-Doped 4h Silicon Carbide Single-Crystal Electrode For Selective Electrochemical Sensing Of Dopamine, Fatemeh Fathi, Brandon Sueoka, Feng Zhao, Xiangqun Zeng

Electrical and Computer Engineering Faculty Research & Creative Works

In this work, we designed, fabricated, and characterized the first nitrogen (N)-doped single-crystalline 4H silicon carbide (4H-SiC) electrode for sensing the neurotransmitter dopamine. This N-doped 4H-SiC electrode showed good selectivity for redox reactions of dopamine in comparison with uric acid (UA), ascorbic acid (AA), and common cationic ([Ru(NH3)6]3+), anionic ([Fe(CN)6]3-), and organic (methylene blue) redox molecules. The mechanisms of this unique selectivity are rationalized by the unique negative Si valency and adsorption properties of the analytes on the N-doped 4H-SiC surface. Quantitative electrochemical detection of dopamine by the 4H-SiC electrode …

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Raveling Performance Of Conventional And Rubberized Chip Seal Under Field And Laboratory Traffic Loading, Alireza Pourhassan, Ahmed A. Gheni, Mohamed Elgawady Mar 2023

Raveling Performance Of Conventional And Rubberized Chip Seal Under Field And Laboratory Traffic Loading, Alireza Pourhassan, Ahmed A. Gheni, Mohamed Elgawady

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Raveling, or the Loss of Surface Aggregate, is a Major Concern in Chip Seal Pavement. Previous Studies Have Used the Standard Sweep, Vialit, and Pennsylvania Tests to Evaluate Raveling, But These Tests Do Not Replicate the Stresses of Rolling Vehicle Tires on Chip Seal and Have Produced Inconsistent Results. Additionally, These Tests Mainly Evaluate Early-Stage Raveling Due to their Short Curing Time. in This Study, a Small-Wheel Traffic Simulation Device (SWTS) Was Used to Apply Similar Stresses as Rolling Vehicle Tires and Produce Comparable Raveling Results. This Was Confirmed through a 13-Month Field Observation of Chip Seal, Where the Laboratory …

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Advanced Ensemble Modeling Method For Space Object State Prediction Accounting For Uncertainty In Atmospheric Density, Smriti Nandan Paul, Richard J. Licata, Piyush M. Mehta Mar 2023

Advanced Ensemble Modeling Method For Space Object State Prediction Accounting For Uncertainty In Atmospheric Density, Smriti Nandan Paul, Richard J. Licata, Piyush M. Mehta

Mechanical and Aerospace Engineering Faculty Research & Creative Works

For objects in the low Earth orbit region, uncertainty in atmospheric density estimation is an important source of orbit prediction error, which is critical for space traffic management activities such as the satellite conjunction analysis. This paper investigates the evolution of orbit error distribution in the presence of atmospheric density uncertainties, which are modeled using probabilistic machine learning techniques. The recently proposed "HASDM-ML," "CHAMP-ML," and "MSIS-UQ" machine learning models for density estimation (Licata and Mehta, 2022b; Licata et al., 2022b) are used in this work. The investigation is convoluted because of the spatial and temporal correlation of the atmospheric density …

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Chemically Induced Ferromagnetism Near Room Temperature In Single Crystal (Zn1−Xcrx)Te Half-Metal, J. Guo, A. Sarikhani, P. Ghosh, T. Heitmann, Yew San Hor, D. K. Singh Mar 2023

Chemically Induced Ferromagnetism Near Room Temperature In Single Crystal (Zn1−Xcrx)Te Half-Metal, J. Guo, A. Sarikhani, P. Ghosh, T. Heitmann, Yew San Hor, D. K. Singh

Physics Faculty Research & Creative Works

Magnetic Semiconductors Are at the Core of Recent Spintronics Research Endeavors. Chemically Doped II-VI Diluted Magnetic Semiconductors, such as (Zn1−xCrx)Te, Provide a Promising Platform in This Quest. However, a Detailed Knowledge of the Microscopic Nature of Magnetic Ground State is Necessary for Any Practical Application. Here, We Report on the Synergistic Study of (Zn1−xCrx)Te Single Crystals using Elastic Neutron Scattering Measurements and Density Functional Calculations. for the First Time, Our Research Unveils the Intrinsic Properties of Ferromagnetic State in a Macroscopic Specimen of (Zn0.8Cr0.2)Te. …

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Impact Of F-D Kondo Cloud On Superconductivity Of Nickelates, Byungkyun Kang, Hyunsoo Kim, Qiang Zhu, Chul Hong Park Mar 2023

Impact Of F-D Kondo Cloud On Superconductivity Of Nickelates, Byungkyun Kang, Hyunsoo Kim, Qiang Zhu, Chul Hong Park

Physics Faculty Research & Creative Works

The Discovery of Superconducting Nickelates Reignited Hope for Elucidating the High-Tc Superconductivity Mechanism in Isostructural Cuprates. While the Superconducting Gap Opens Up on a Single Band of the Quasi-2D Fermi Surface in the Cuprates, the Nickelates Are Known to Have a 3D Nature of an Electronic Structure with a Multi-Band. This Raises a Serious Question About the Role of the 2D Nature for the High-Tc Superconductivity. Here, Employing GW + Dynamical Mean Field Theory (DMFT), We Report the Kondo Effect Driven by the Strong Correlation of Nd-4f and Ni-3d Electrons Emerging at Low Temperature. the Kondo Effect Modifies …

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Photolysis Of 3-Nitro-1,2,4-Triazol-5-One: Mechanisms And Products, Hunter W. Schroer, Esteban Londono, Xueshu Li, Hans Joachim Lehmler, William Arnold, Craig L. Just Mar 2023

Photolysis Of 3-Nitro-1,2,4-Triazol-5-One: Mechanisms And Products, Hunter W. Schroer, Esteban Londono, Xueshu Li, Hans Joachim Lehmler, William Arnold, Craig L. Just

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Insensitive munitions formulations that include 3-nitro-1,2,4-triazol-5-one (NTO) are replacing traditional explosive compounds. While these new formulations have superior safety characteristics, the compounds have greater environmental mobility, raising concern over potential contamination and cleanup of training and manufacturing facilities. Here, we examine the mechanisms and products of NTO photolysis in simulated sunlight to further inform NTO degradation in sunlit surface waters. We demonstrate that NTO produces singlet oxygen, and that dissolved oxygen increases the NTO photolysis rate in deionized water. The rate of NTO photolysis is independent of concentration and decreases slightly in the presence of Suwannee River Natural Organic Matter. …

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Nagase2: A Water-Loving Multifunctional Non-Van Der Waals Layered Selenogallate, Srikanth Balijapelly, Santhoshkumar Sundaramoorthy, Dibya Jyoti Mondal, Sanjit Konar, Nikolay Gerasimchuk, Aleksandr V. Chernatynskiy, Amitava Choudhury Mar 2023

Nagase2: A Water-Loving Multifunctional Non-Van Der Waals Layered Selenogallate, Srikanth Balijapelly, Santhoshkumar Sundaramoorthy, Dibya Jyoti Mondal, Sanjit Konar, Nikolay Gerasimchuk, Aleksandr V. Chernatynskiy, Amitava Choudhury

Physics Faculty Research & Creative Works

A Missing Member of Well-Known Ternary Chalcometallates, a Sodium Selenogallate, NaGaSe2, Has Been Synthesized by Employing a Polyselenide Flux and Stoichiometric Reaction. Crystal Structure Analysis using X-Ray Diffraction Techniques Reveals that It Contains Supertetrahedral Adamantane-Type Ga4Se10 Secondary Building Units. These Ga4Se10 Secondary Building Units Are Further Connected Via Corners to Form Two-Dimensional (2D) [GaSe2]∞- Layers Stacked Along the C-Axis of the Unit Cell, and the Na Ions Reside in the Interlayer Space. the Compound Has an Unusual Ability to Absorb Water Molecules from the Atmosphere or a Nonanhydrous …

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Hyperspectral Reflectance For Determination Of Steel Rebar Corrosion And Cl− Concentration, Pengfei Ma, Liang Fan, Genda Chen Mar 2023

Hyperspectral Reflectance For Determination Of Steel Rebar Corrosion And Cl− Concentration, Pengfei Ma, Liang Fan, Genda Chen

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

In This Study, a New Method is Proposed to Determine Chloride Ion (Cl−) Concentration and Steel Rebar Corrosion from Hyperspectral Spectroscopy. Three Groups of Mortar Cubes with Water-To-Cement (W/c) Ratios of 0.5, 0.6, and 0.7 Were Subjected to Rapid Corrosion Testing in 3.5 Wt% NaCl Solution to Accelerate the Transport of Chloride Ions. Embedded Along the Centerline of Each Mortar Cube Was a Steel Rebar that Corroded When the Cl− Accumulation Around It Exceeded a Critical/threshold Concentration. Open Circuit Potential Was Measured to Characterize the Corrosion Possibility of Steel Rebar. Mortar Surfaces Were Scanned with a Hyperspectral Camera in the …

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Error Analysis Of A Fully Discrete Projection Method For Magnetohydrodynamic System, Qianqian Ding, Xiaoming He, Xiaonian Long, Shipeng Mao Mar 2023

Error Analysis Of A Fully Discrete Projection Method For Magnetohydrodynamic System, Qianqian Ding, Xiaoming He, Xiaonian Long, Shipeng Mao

Mathematics and Statistics Faculty Research & Creative Works

In this paper, we develop and analyze a finite element projection method for magnetohydrodynamics equations in Lipschitz domain. A fully discrete scheme based on Euler semi-implicit method is proposed, in which continuous elements are used to approximate the Navier–Stokes equations and H(curl) conforming Nédélec edge elements are used to approximate the magnetic equation. One key point of the projection method is to be compatible with two different spaces for calculating velocity, which leads one to obtain the pressure by solving a Poisson equation. The results show that the proposed projection scheme meets a discrete energy stability. In addition, with the …

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Error Analysis Of A Fully Discrete Projection Method For Magnetohydrodynamic System, Qianqian Ding, Xiaoming He, Xiaonian Long, Shipeng Mao Mar 2023

Error Analysis Of A Fully Discrete Projection Method For Magnetohydrodynamic System, Qianqian Ding, Xiaoming He, Xiaonian Long, Shipeng Mao

Mathematics and Statistics Faculty Research & Creative Works

In this paper, we develop and analyze a finite element projection method for magnetohydrodynamics equations in Lipschitz domain. A fully discrete scheme based on Euler semi-implicit method is proposed, in which continuous elements are used to approximate the Navier–Stokes equations and H(curl) conforming Nédélec edge elements are used to approximate the magnetic equation. One key point of the projection method is to be compatible with two different spaces for calculating velocity, which leads one to obtain the pressure by solving a Poisson equation. The results show that the proposed projection scheme meets a discrete energy stability. In addition, with the …

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Thermal Analysis Of Si-Igbt Based Power Electronic Modules In 50kw Traction Inverter Application, Mohammad Shahjalal, Tamanna Shams, Sadat Bin Hossain, Md Rishad Ahmed, Mominul Ahsan, Julfikar Haider, Rajib Goswami, Syed B. Alam, Atif Iqbal Mar 2023

Thermal Analysis Of Si-Igbt Based Power Electronic Modules In 50kw Traction Inverter Application, Mohammad Shahjalal, Tamanna Shams, Sadat Bin Hossain, Md Rishad Ahmed, Mominul Ahsan, Julfikar Haider, Rajib Goswami, Syed B. Alam, Atif Iqbal

Nuclear Engineering and Radiation Science Faculty Research & Creative Works

Estimation of Accurate IGBT Junction Temperature is Crucial for Reliability Assessment. the Well-Known RC Lumped Approach Can Help Predict Junction Temperature. However, This Method Suffers from Inaccuracy While Characterizing the Thermal Behavior of Several IGBT Modules Mounted to the Liquid-Cooled Heatsink. Specifically, the Thermal Challenge Originates from the Thermal Cross-Coupling and Module-To-Module Heat Spreading and the Converter Cooling Condition. This Article Demonstrates a Methodology to Study the Impact of Heat Spreading, Thermal Interface Material, and Massive Size Liquid Cold-Plate on the overall Thermal Behavior. a Case Study of 50 KW Traction Inverter is Chosen to Demonstrate the Benefit of Early …

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Studies On The Enrichment Feasibility Of Rare Earth-Bearing Minerals In Mine Tailings, Jose L. Corchado-Albelo, Lana Z. Alagha Mar 2023

Studies On The Enrichment Feasibility Of Rare Earth-Bearing Minerals In Mine Tailings, Jose L. Corchado-Albelo, Lana Z. Alagha

Mining Engineering Faculty Research & Creative Works

This Study Aimed to Investigate the Potential of Enrichment of Rare-Earth-Bearing Minerals in Historic Mine Tailing using the Froth Flotation Process. Characterization Studies Indicated that Tailings Contained 11,000 Ppm of Rare Earth Elements (REEs). the Major Mineral in the Tailings Was Apatite at ~84%, Which Was Associated with Iron Oxides (~16%). TESCAN's Integrated Mineral Analysis (TIMA) Showed that Monazite Was the Main REE Mineral, and 69% of Monazite Was Locked in Apatite Grains. Characterization Studies Suggested that the Separation of REEs-Bearing Apatite from Iron Oxides is Possible using Froth Flotation, Wherein Apatite Was Floated and Iron Oxides Were Depressed. Zeta …

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Evaluating The Effect Of Overburden Depth, Mining Height, And Support Density On Coal Rib Damage Using Dem Modeling, Maurice Sunkpal, Taghi Sherizadeh, Dogukan Guner Mar 2023

Evaluating The Effect Of Overburden Depth, Mining Height, And Support Density On Coal Rib Damage Using Dem Modeling, Maurice Sunkpal, Taghi Sherizadeh, Dogukan Guner

Mining Engineering Faculty Research & Creative Works

There Has Been a Global Effort in the Past Decade, Especially in Major Coal-Producing Countries, toward Understanding the Mechanics Involved in the Stability of Coal Mine Ribs. Buckling and Spalling of Mine Ribs Are Known to Have an Impact on their Stability and Degradation. the Generation, Propagation, and Coalescence of Cracks in Mine Pillar Ribs Are Significantly Affected by the overburden Depths. in Addition, the in Situ Stress Magnitudes Tend to Affect the Rib Damage Process. High Horizontal Stresses and Increased Depths Can Lead to Unfavorable Stress Conditions, Inducing Coal Mass Damage and Strength Loss. Understanding the Dynamics Involved in …

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Unmanned-Aircraft-System-Assisted Early Wildfire Detection With Air Quality Sensors †, Doaa Rjoub, Ahmad Alsharoa, Ala'eddin Masadeh Mar 2023

Unmanned-Aircraft-System-Assisted Early Wildfire Detection With Air Quality Sensors †, Doaa Rjoub, Ahmad Alsharoa, Ala'eddin Masadeh

Electrical and Computer Engineering Faculty Research & Creative Works

Numerous Hectares of Land Are Destroyed by Wildfires Every Year, Causing Harm to the Environment, the Economy, and the Ecology. More Than Fifty Million Acres Have Burned in Several States as a Result of Recent Forest Fires in the Western United States and Australia. According to Scientific Predictions, as the Climate Warms and Dries, Wildfires Will Become More Intense and Frequent, as Well as More Dangerous. These Unavoidable Catastrophes Emphasize How Important Early Wildfire Detection and Prevention Are. the Energy Management System Described in This Paper Uses an Unmanned Aircraft System (UAS) with Air Quality Sensors (AQSs) to Monitor Spot …

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Special Section On Local And Distributed Electricity Markets, Rui Bo, Linquan Bai, Antonio J. Conejo, Jianzhong Wu, Tao Jiang, Fei Ding, Babak Enayati Mar 2023

Special Section On Local And Distributed Electricity Markets, Rui Bo, Linquan Bai, Antonio J. Conejo, Jianzhong Wu, Tao Jiang, Fei Ding, Babak Enayati

Electrical and Computer Engineering Faculty Research & Creative Works

Driven by the Goals of Clean Energy and Zero Carbon Emissions, the Power Industry is Undergoing Significant Transformations. the Rapid Growth of Diverse Distributed Energy Resources (DERs) at Grid Edge Such as Rooftop Photovoltaics (PVs) and Electric Vehicles is Transforming the Traditional Centralized Power Grid Management to a Decentralized, Bottom-Up, and Localized Control Paradigm. Establishing Local and Distribution-Level Electricity Markets Provides an Effective Solution to Managing Large Amounts of Small-Scale DERs. New Regulations Such as the Recent FERC Order 2222 in the U.S. Open the Door to DERs in the Wholesale Markets. through Coordinating the Local and Distribution-Level Markets with …

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Finite Element Procedure To Simulate Sandwich Structure With An Auxetic Core Under Impact Loading Using Abaqus/Explicit, Valdo Pratama, Annisa Jusuf, Arief Yudhanto, Bambang Kismono Hadi Mar 2023

Finite Element Procedure To Simulate Sandwich Structure With An Auxetic Core Under Impact Loading Using Abaqus/Explicit, Valdo Pratama, Annisa Jusuf, Arief Yudhanto, Bambang Kismono Hadi

Mechanical and Aerospace Engineering Faculty Research & Creative Works

A sandwich structure with an auxetic core is promising in improving the performance of a sandwich structure by implying an auxetic core as its core to combine the advantages of the two structures, e.g., sandwich structure's superior ability in flexural and shear resistance, auxetic structure in localizing damage, and densification phenomena. This paper discusses a finite element modeling procedure to simulate a sandwich structure with a heterogeneous re-entrant auxetic core. The material of the face is a unidirectional carbon fiber reinforced polymer (UD CFRP) and the core is polylactic acid (PLA). The model is subjected to a low-velocity impact loading …

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Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar Mar 2023

Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar

Electrical and Computer Engineering Faculty Research & Creative Works

Fly ash (FA) – an industrial byproduct – is used to partially substitute Portland cement (PC) in concrete to mitigate concrete's environmental impact. Chemical composition and structure of FAs significantly impact hydration kinetics and compressive strength of concrete. Due to the substantial diversity in these physicochemical attributes of FAs, it has been challenging to develop a generic theoretical framework – and, therefore, theory-Based analytical models – that could produce reliable, a priori predictions of properties of [PC + FA] binders. in recent years, machine learning (ML) – which is purely data-driven, as opposed to being derived from theorical underpinnings – …

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Suppressing White-Noise Interference For Orbital Angular Momentum Waves Via The Forward-Backward Dynamic Mode Decomposition, Yanming Zhang, Lijun Jiang Mar 2023

Suppressing White-Noise Interference For Orbital Angular Momentum Waves Via The Forward-Backward Dynamic Mode Decomposition, Yanming Zhang, Lijun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

When the orbital angular momentum (OAM)-carrying beam propagates in a highly boisterous environment, it causes the degradation of the OAM modes' purity, which brings the crosstalk in the demultiplexing process. To address this issue, we extend the dynamic mode decomposition (DMD) method to suppress white-noise interferences of OAM by using the forward-backward DMD (FBDMD) approach. The FBDMD-based scheme retrieves the noise-free DMD mapping matrix corresponding to the actual OAM's topological charges by combining the forward and backward DMD mapping matrix in the noisy environment and consequently reduces the crosstalk, particularly for sorting the superposed OAM modes. Numerical examples are provided …

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Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar Mar 2023

Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar

Electrical and Computer Engineering Faculty Research & Creative Works

Fly ash (FA) – an industrial byproduct – is used to partially substitute Portland cement (PC) in concrete to mitigate concrete's environmental impact. Chemical composition and structure of FAs significantly impact hydration kinetics and compressive strength of concrete. Due to the substantial diversity in these physicochemical attributes of FAs, it has been challenging to develop a generic theoretical framework – and, therefore, theory-based analytical models – that could produce reliable, a priori predictions of properties of [PC + FA] binders. In recent years, machine learning (ML) – which is purely data-driven, as opposed to being derived from theorical underpinnings – …

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Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar Mar 2023

Deep Learning To Predict The Hydration And Performance Of Fly Ash-Containing Cementitious Binders, Taihao Han, Rohan Bhat, Sai Akshay Ponduru, Amit Sarkar, Jie Huang, Gaurav Sant, Hongyan Ma, Narayanan Neithalath, Aditya Kumar

Electrical and Computer Engineering Faculty Research & Creative Works

Fly ash (FA) – an industrial byproduct – is used to partially substitute Portland cement (PC) in concrete to mitigate concrete's environmental impact. Chemical composition and structure of FAs significantly impact hydration kinetics and compressive strength of concrete. Due to the substantial diversity in these physicochemical attributes of FAs, it has been challenging to develop a generic theoretical framework – and, therefore, theory-based analytical models – that could produce reliable, a priori predictions of properties of [PC + FA] binders. In recent years, machine learning (ML) – which is purely data-driven, as opposed to being derived from theorical underpinnings – …

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Positioning, Articulating, And Crafting Conceptual Articles On Entrepreneurship, James J. Chrisman, Chevy-Hanqing Fang, Lloyd Steier Mar 2023

Positioning, Articulating, And Crafting Conceptual Articles On Entrepreneurship, James J. Chrisman, Chevy-Hanqing Fang, Lloyd Steier

Business and Information Technology Faculty Research & Creative Works

Conceptual Articles Are Important for Theory Building but the Special Challenges of Developing Conceptual Articles on Entrepreneurship Has Not Been Fully Considered. We Begin to Fill This Gap by Discussing the Nature of Conceptual Articles on Entrepreneurship, Particularly Those Geared for Publication in Entrepreneurship Theory and Practice. We Introduce Three Dimensions of the Entrepreneurship Discipline—uniqueness, Relevance, and Multiplicity—and Discuss How They Can Affect the Positioning of Conceptual Articles and the Articulation of their Contribution. We Also Enumerate Some Basic Principles for Crafting Good Conceptual Articles and Present Guidelines based on Our Discussion.

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Building A Unified Data Falsification Threat Landscape For Internet Of Things/Cyberphysical Systems Applications, Shameek Bhattacharjee, Sajal K. Das Mar 2023

Building A Unified Data Falsification Threat Landscape For Internet Of Things/Cyberphysical Systems Applications, Shameek Bhattacharjee, Sajal K. Das

Computer Science Faculty Research & Creative Works

We Lay Out a Blueprint of a Complete and Parameterized Threat Landscape for Data Falsification/false Data Injection Attacks on Telemetry Data Collected from Internet of Things/cyberphysical Systems Applications under Zero-Trust Assumptions, Helping to Enable Better Validation of Anomaly-Based Attack Detection Methods.

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Particle Migration In Large Cross-Section Ceramic On-Demand Extrusion Components, Austin J. Martin, Wenbin Li, Jeremy Lee Watts, Gregory E. Hilmas, Ming-Chuan Leu, Tieshu Huang Mar 2023

Particle Migration In Large Cross-Section Ceramic On-Demand Extrusion Components, Austin J. Martin, Wenbin Li, Jeremy Lee Watts, Gregory E. Hilmas, Ming-Chuan Leu, Tieshu Huang

Materials Science and Engineering Faculty Research & Creative Works

Ceramic On-Demand Extrusion (CODE) is a direct ink writing process which allows for the creation of near theoretically dense ceramic components with large cross-sections due to oil-assisted drying. Yttria-stabilized zirconia (YSZ) colloidal pastes (∼d50 ≲ 1 µm) were used in CODE to produce dense (multi-road infill and ≳ 98% relative density), large continuous volume (> 1 cm3), and high fidelity (nozzle diameters ≲ 1 mm) structural ceramic components. However, many of these printed components underwent significant particle migration after forming. The reason for this particle migration defect was investigated using the coffee-ring effect for dilute solutions and rheological methods for …

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Influence Of Adhesive Application Method And Thermocycling On The Bonding Performance Of Different Adhesive Systems To Dentin, Lamiaa Mahmoud Moharam, Rasha Hassan Afifi Mar 2023

Influence Of Adhesive Application Method And Thermocycling On The Bonding Performance Of Different Adhesive Systems To Dentin, Lamiaa Mahmoud Moharam, Rasha Hassan Afifi

Chemical and Biochemical Engineering Faculty Research & Creative Works

Aim: To assess the effect of multiple layers application of different adhesive systems on the microshear bond strength (μSBS) of dentin with and without thermocycling. Materials and Methods: Two hundred forty sound human premolars had their enamel surfaces removed to expose even surfaces of dentin. The teeth were mounted in acrylic resin blocks and then assigned arbitrarily into four main groups (n = 60) representing the investigated adhesives (a self-etch [SE] adhesive, a total-etch [TE] adhesive, and a multimode [MM] adhesive used in TE and SE modes). Individually, the main groups were equally alienated into three subgroups (n = 20), …

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Engineering Oxygen Vacancy-Rich Ceox Overcoating Onto Ni/Al2o3 By Atomic Layer Deposition For Bi-Reforming Of Methane, Baitang Jin, Kaiying Wang, Han Yu, Xiaoqing He, Xinhua Liang Mar 2023

Engineering Oxygen Vacancy-Rich Ceox Overcoating Onto Ni/Al2o3 By Atomic Layer Deposition For Bi-Reforming Of Methane, Baitang Jin, Kaiying Wang, Han Yu, Xiaoqing He, Xinhua Liang

Chemical and Biochemical Engineering Faculty Research & Creative Works

Atomic Layer Deposition (ALD) Was Applied to Develop CeOx-Overcoated Ni/Al2O3 Catalyst for Bi-Reforming of Methane (BRM), as the Combination of Dry Reforming of Methane (DRM) and Steam Reforming of Methane (SRM). Non-Stoichiometric CeOx Thin Films Were Successfully Deposited on Ni/Al2O3 Particles by ALD, Which Constructed a Beneficial Ni-CeOx Interface and Modified the Catalyst Property. Ascribed to the Unique ALD Growth Mode, a High Amount of Ce(III) and Oxygen Vacancies Existed in the ALD-Deposited CeOx overcoating. a Reduction Process Before the BRM Reaction Contributed to the Further Reduction of Ce(IV) …

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