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Kinetic And Chemical Effects Of Clays And Other Fillers In The Preparation Of Epoxy-Vinyl Ether Composites Using Radical-Induced Cationic Frontal Polymerization, Brecklyn R. Groce, Emma E. Lane, Daniel P. Gary, Douglas T. Ngo, Dylan T. Ngo, Fahima Shaon, Jorge A. Belgodere, John A. Pojman Apr 2023

Kinetic And Chemical Effects Of Clays And Other Fillers In The Preparation Of Epoxy-Vinyl Ether Composites Using Radical-Induced Cationic Frontal Polymerization, Brecklyn R. Groce, Emma E. Lane, Daniel P. Gary, Douglas T. Ngo, Dylan T. Ngo, Fahima Shaon, Jorge A. Belgodere, John A. Pojman

Faculty Publications

Addition of fillers to formulations can generate composites with improved mechanical properties and lower the overall cost through a reduction of chemicals needed. In this study, fillers were added to resin systems consisting of epoxies and vinyl ethers that frontally polymerized through a radical-induced cationic frontal polymerization (RICFP) mechanism. Different clays, along with inert fumed silica, were added to increase the viscosity and reduce the convection, results of which did not follow many trends present in free-radical frontal polymerization. The clays were found to reduce the front velocity of RICFP systems overall compared to systems with only fumed silica. It …

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Semi-Differentiation Of Reversible, Soluble-Insoluble Potential Sweep Voltammograms, Tyler Williams, Ranon Fuller, Cameron Vann, Devin Rappleye Apr 2023

Semi-Differentiation Of Reversible, Soluble-Insoluble Potential Sweep Voltammograms, Tyler Williams, Ranon Fuller, Cameron Vann, Devin Rappleye

Faculty Publications

Semi-differentiation, or convolution as it is sometimes known, is a mathematical technique commonly used to disentangle overlapping peaks in cyclic or linear sweep voltammograms. However, this technique is often misapplied due to misunderstandings of fractional calculus. Additionally, rigorous treatment and validation of the theory of semi-differential analysis of reversible, soluble-insoluble electrochemical reactions is lacking. Peculiarities of semi-differentiation are explored; theoretical relations for semi-differentiated voltammograms are given; the exponential nature of the theoretical curve is explored; theoretical relations are compared to experimental voltammograms for AgNO3 in 1 M nitric acid at 298 K, NiCl2 in LiCl at 974 K, …

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Injectable Antioxidant And Oxygen-Releasing Lignin Composites To Promote Wound Healing, Swathi Balaji, Walker D. Short, Benjamin W. Padon, Jorge A. Belgodere, Sarah E. Jimenez, Naresh T. Deoli, Anna C. Guidry, Justin C. Green, Tanuj J. Prajapati, Fayiz Farouk, Aditya Kaul, Dongwan Son, Olivia S. Jung, Carlos E. Astete, Myungwoong Kim, Jangwook P. Jung Apr 2023

Injectable Antioxidant And Oxygen-Releasing Lignin Composites To Promote Wound Healing, Swathi Balaji, Walker D. Short, Benjamin W. Padon, Jorge A. Belgodere, Sarah E. Jimenez, Naresh T. Deoli, Anna C. Guidry, Justin C. Green, Tanuj J. Prajapati, Fayiz Farouk, Aditya Kaul, Dongwan Son, Olivia S. Jung, Carlos E. Astete, Myungwoong Kim, Jangwook P. Jung

Faculty Publications

The application of engineered biomaterials for wound healing has been pursued since the beginning of tissue engineering. Here, we attempt to apply functionalized lignin to confer antioxidation to the extracellular microenvironments of wounds and to deliver oxygen from the dissociation of calcium peroxide for enhanced vascularization and healing responses without eliciting inflammatory responses. Elemental analysis showed 17 times higher quantity of calcium in the oxygen-releasing nanoparticles. Lignin composites including the oxygen-generating nanoparticles released around 700 ppm oxygen per day at least for 7 days. By modulating the concentration of the methacrylated gelatin, we were able to maintain the injectability of …

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Inverse Machine Learning Discovered Metamaterials With Record High Recovery Stress, Adithya Challapalli, John Konlan, Guoqiang Li Apr 2023

Inverse Machine Learning Discovered Metamaterials With Record High Recovery Stress, Adithya Challapalli, John Konlan, Guoqiang Li

Faculty Publications

Lightweight shape memory polymer (SMP) metamaterials integrated with high strength, high flexibility, and high recovery stress are highly desired in load carrying structures and devices. A grand challenge is that these desired properties have contradictory requirements, for instance between strength and flexibility, and between flexibility and recovery stress. In this study, an inverse design framework using statistical tools and machine learning models is developed to design thin-walled cellular structures with the desired properties. The discovered thin-walled cellular structures are 3D printed using a novel SMP, which exhibited excellent structural properties with record high specific recovery stress. For comparison purpose, lattice …

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Optimization Of Host Cell-Compatible, Antimicrobial Peptides Effective Against Biofilms And Clinical Isolates Of Drug-Resistant Bacteria, Jenisha Ghimire, Robert J. Hart, Anabel Soldano, Charles H. Chen, Shantanu Guha, Joseph P. Hoffmann, Kalen M. Hall, Leisheng Sun, Benjamin J. Nelson, Timothy K. Lu, Jay K. Kolls, Mario Rivera, Lisa A. Morici, William C. Wimley Apr 2023

Optimization Of Host Cell-Compatible, Antimicrobial Peptides Effective Against Biofilms And Clinical Isolates Of Drug-Resistant Bacteria, Jenisha Ghimire, Robert J. Hart, Anabel Soldano, Charles H. Chen, Shantanu Guha, Joseph P. Hoffmann, Kalen M. Hall, Leisheng Sun, Benjamin J. Nelson, Timothy K. Lu, Jay K. Kolls, Mario Rivera, Lisa A. Morici, William C. Wimley

Faculty Publications

Here, we describe the continued synthetic molecular evolution of a lineage of host-compatible antimicrobial peptides (AMP) intended for the treatment of wounds infected with drug-resistant, biofilm-forming bacteria. The peptides tested are variants of an evolved AMP called d-amino acid CONsensus with Glycine Absent (d-CONGA), which has excellent antimicrobial activities in vitro and in vivo. In this newest generation of rational d-CONGA variants, we tested multiple sequence-structure-function hypotheses that had not been tested in previous generations. Many of the peptide variants have lower antibacterial activity against Gram-positive or Gram-negative pathogens, especially variants that have altered hydrophobicity, secondary structure potential, or spatial …

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Information Horizon Of Solar Active Regions, Jay R. Johnson, Simon Wing, Carson O'Ffill, Bishwa Neupane Apr 2023

Information Horizon Of Solar Active Regions, Jay R. Johnson, Simon Wing, Carson O'Ffill, Bishwa Neupane

Faculty Publications

Information theory is used to characterize the solar active region periodicities and memories from the Carrington map images 1974–2021. The active regions typically evolve and move from one map to the next. In order to track these active region structures in sequences of images, an innovative method based on information theory is developed. Image entropy provides a measure of the organization of structures in the images. The entropy can also be used as a filter to identify structures and partition the active regions, which are then registered for each image. The partitions are used to compute the mutual information and …

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Ion Selective And Water Resistant Cellulose Nanofiber/Mxene Membrane Enabled Cycling Zn Anode At High Currents, Wangwang Xu, Xiaobin Liao, Weina Xu, Kangning Zhao, Guang Yao, Qinglin Wu Apr 2023

Ion Selective And Water Resistant Cellulose Nanofiber/Mxene Membrane Enabled Cycling Zn Anode At High Currents, Wangwang Xu, Xiaobin Liao, Weina Xu, Kangning Zhao, Guang Yao, Qinglin Wu

Faculty Publications

Aqueous rechargeable zinc ion batteries (ZIBs) are regarded as a promising candidates for next-generation energy storage devices but strongly hindered by the limited utilization of the zinc metal anode (below 5%) due to the active water/anion corrosion. Herein, an ion selective and water-resistant cellulose nanofiber (CNF)/MXene composite membrane has been developed through molecular sieving to restrict active water and anions from the electrode/electrolyte interface through dehydration of zinc ions, avoiding the water/anion-induced corrosion/decomposition. In this way, the CNF/MXene@Zn anode exhibits significantly enhanced coulombic efficiency (99.5 % at 10 mA cm-2) and low voltage hysteresis. Moreover, coated with CNF/MXene composite membrane, …

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New Perspectives On Foot Segment Forces And Joint Kinetics - Integrating Plantar Shear Stresses And Pressures With Multi-Segment Foot Modeling, Dustin A. Bruening, Spencer R. Petersen, Sarah T. Ridge Apr 2023

New Perspectives On Foot Segment Forces And Joint Kinetics - Integrating Plantar Shear Stresses And Pressures With Multi-Segment Foot Modeling, Dustin A. Bruening, Spencer R. Petersen, Sarah T. Ridge

Faculty Publications

The role of the foot in gait is not well understood, in part due to challenges in capturing and utilizing segmental ground reaction forces. The purposes of this study were to 1) develop methodology to integrate plantar pressure/shear stresses with a multi-segment foot model, and 2) generate and display key normative data from this combined system. Twenty-six young healthy adults walked barefoot (1.3 m/s) across a pressure/shear sensor with markers matching a published 4-segment kinetic foot model. A novel anatomical/geometric masking method was developed that successfully separated regions aligned with model segmentation. This template-based method can be automated and customized …

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Coarse Particulate Matter Air Quality In East Asia: Implications For Fine Particulate Nitrate, Shixian Zhai, Daniel J. Jacob, Drew C. Pendergrass, Nadia K. Colombi, Viral Shah, Laura Hyesung Yang, Qiang Zhang, Shuxiao Wang, Hwajin Kim, Yele Sun, Jin-Soo Choi, Jin-Soo Park, Gan Luo, Fangqun Yu, Jung-Hun Woo, Younha Kim, Jack E. Dibb, Taehyoung Lee, Jin-Seok Han, Bruce E. Anderson, Ke Li, Hong Liao Apr 2023

Coarse Particulate Matter Air Quality In East Asia: Implications For Fine Particulate Nitrate, Shixian Zhai, Daniel J. Jacob, Drew C. Pendergrass, Nadia K. Colombi, Viral Shah, Laura Hyesung Yang, Qiang Zhang, Shuxiao Wang, Hwajin Kim, Yele Sun, Jin-Soo Choi, Jin-Soo Park, Gan Luo, Fangqun Yu, Jung-Hun Woo, Younha Kim, Jack E. Dibb, Taehyoung Lee, Jin-Seok Han, Bruce E. Anderson, Ke Li, Hong Liao

Faculty Publications

Air quality network data in China and South Korea show very high year-round mass concentrations of coarse particulate matter (PM), as inferred by the difference between PM10 and PM2.5. Coarse PM concentrations in 2015 averaged 52 µg m−3 in the North China Plain (NCP) and 23 µg m−3 in the Seoul Metropolitan Area (SMA), contributing nearly half of PM10. Strong daily correlations between coarse PM and carbon monoxide imply a dominant source from anthropogenic fugitive dust. Coarse PM concentrations in the NCP and the SMA decreased by 21 % from 2015 to 2019 and further dropped abruptly in 2020 due …

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Does Mitochondrial Replacement Therapy Violate Laws Against Human Cloning?, Kerry L. Macintosh Apr 2023

Does Mitochondrial Replacement Therapy Violate Laws Against Human Cloning?, Kerry L. Macintosh

Faculty Publications

All human beings have mitochondria within their cells that produce energy.1 Most of us inherit healthy mitochondria through the eggs of our mothers,2 but some of us are not so lucky. Mutations in mitochondrial DNA (mtDNA) can cause these tiny organelles to function improperly and disrupt tissues that require a lot of energy, like the brain, kidney, liver, heart, muscle, and central nervous system.3 For example, a specific mtDNA mutation induces Leigh syndrome, a condition in which seizures and respiratory failure lead to decline in mental and motor skills, disabil- ity, and death.4 Mitochondrial replacement therapy (MRT) offers a solution …

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Wind-Current Feedback Is An Energy Sink For Oceanic Internal Waves, Audrey Delpech, Roy Barkan, Lionel Renault, James Mcwilliams, Oladeji Q. Siyanbola, Maarten C. Buijsman, Brian K. Arbic Apr 2023

Wind-Current Feedback Is An Energy Sink For Oceanic Internal Waves, Audrey Delpech, Roy Barkan, Lionel Renault, James Mcwilliams, Oladeji Q. Siyanbola, Maarten C. Buijsman, Brian K. Arbic

Faculty Publications

Internal waves contain a large amount of energy in the ocean and are an important source of turbulent mixing. Ocean mixing is relevant for climate because it drives vertical transport of water, heat, carbon and other tracers. Understanding the life cycle of internal waves, from generation to dissipation, is therefore important for improving the representation of ocean mixing in climate models. Here, we provide evidence from a regional realistic numerical simulation in the northeastern Pacific that the wind can play an important role in damping internal waves through current feedback. This results in a reduction of 67% of wind power …

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Microcanonical Thermodynamics Of Small Ideal Gas Systems, David S. Corti, Donya Ohadi, Ricardo Fariello, Mark J. Uline Apr 2023

Microcanonical Thermodynamics Of Small Ideal Gas Systems, David S. Corti, Donya Ohadi, Ricardo Fariello, Mark J. Uline

Faculty Publications

We consider the thermal, mechanical, and chemical contact of two subsystems composed of ideal gases, both of which are not in the thermodynamic limit. After contact, the combined system is isolated, and the entropy is determined through the use of its standard connection to the phase space density (PSD), where only those microstates at a given energy value are counted. The various intensive properties of these small systems that follow from a derivative of the PSD, such as the temperature, pressure, and chemical potential (evaluated via a backward difference), while equal when the two subsystems are in equilibrium are nevertheless …

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Trauma-Informed Academic Partnership, Ingrid Weiss Slikkers Apr 2023

Trauma-Informed Academic Partnership, Ingrid Weiss Slikkers

Faculty Publications

No abstract provided.

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Partnership Grant And Shark Tank Competition: An Update, Hyun Kwon Apr 2023

Partnership Grant And Shark Tank Competition: An Update, Hyun Kwon

Faculty Publications

No abstract provided.

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Utilizing The System Engineering Trade Study Analysis Method To Analyze Patient Aeromedical Evacuation, Sara Shaghaghi, Jeremy M. Slagley, Michael E. Miller, Gaiven Varshney Apr 2023

Utilizing The System Engineering Trade Study Analysis Method To Analyze Patient Aeromedical Evacuation, Sara Shaghaghi, Jeremy M. Slagley, Michael E. Miller, Gaiven Varshney

Faculty Publications

The US Air Force has gone through many aeromedical patient isolation transport system designs. The first designs were developed in response to the Ebola outbreak in 2014 and, more recently, the COVID-19 pandemic. The trade study analysis part of the system engineering design method was used to analyze the historic and current aeromedical patient contamination control transport systems. A trade study is a process that evaluates alternatives based upon various “-ilities”, such as reconfigurability, flexibility, durability, cost, and more, and performs a systematic analysis to aid designers in producing a ‘good’ design alternative given the large set of possible solutions. …

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Horizontally Transferred Genes As Rna Interference Targets For Aphid And Whitefly Control, Honglin Feng, Wenbo Chen, Sonia Hussain, Sara Shakir, Vered Tzin, Femi Adegbayi, Todd Ugine, Zhangjun Fei, Georg Jander Apr 2023

Horizontally Transferred Genes As Rna Interference Targets For Aphid And Whitefly Control, Honglin Feng, Wenbo Chen, Sonia Hussain, Sara Shakir, Vered Tzin, Femi Adegbayi, Todd Ugine, Zhangjun Fei, Georg Jander

Faculty Publications

RNA interference (RNAi)-based technologies are starting to be commercialized as a new approach for agricultural pest control. Horizontally transferred genes (HTGs), which have been transferred into insect genomes from viruses, bacteria, fungi or plants, are attractive targets for RNAi-mediated pest control. HTGs are often unique to a specific insect family or even genus, making it unlikely that RNAi constructs targeting such genes will have negative effects on ladybugs, lacewings and other beneficial predatory insect species. In this study, we sequenced the genome of a red, tobacco-adapted isolate of Myzus persicae (green peach aphid) and bioinformatically identified 30 HTGs. We then …

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Environment-Tolerant Ionic Hydrogel–Elastomer Hybrids With Robust Interfaces, High Transparence, And Biocompatibility For A Mechanical–Thermal Multimode Sensor, Ya Lu, Yiying Yue, Qinqin Ding, Changtong Mei, Xinwu Xu, Shaohua Jiang, Shuijian He, Qinglin Wu, Huining Xiao, Jingquan Han Apr 2023

Environment-Tolerant Ionic Hydrogel–Elastomer Hybrids With Robust Interfaces, High Transparence, And Biocompatibility For A Mechanical–Thermal Multimode Sensor, Ya Lu, Yiying Yue, Qinqin Ding, Changtong Mei, Xinwu Xu, Shaohua Jiang, Shuijian He, Qinglin Wu, Huining Xiao, Jingquan Han

Faculty Publications

The human skin, an important sensory organ, responds sensitively to external stimuli under various harsh conditions. However, the simultaneous achievement of mechanical/thermal sensitivity and extreme environmental tolerance remains an enormous challenge for skin-like hydrogel-based sensors. In this study, a novel skin-inspired hydrogel–elastomer hybrid with a sandwich structure and strong interfacial bonding for mechanical–thermal multimode sensing applications is developed. An inner-layered ionic hydrogel with a semi-interpenetrating network is prepared using sodium carboxymethyl cellulose (CMC) as a nanofiller, lithium chloride (LiCl) as an ionic transport conductor, and polyacrylamide (PAM) as a polymer matrix. The outer-layered polydimethylsiloxane (PDMS) elastomers fully encapsulating the hydrogel …

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Regional Variation In Feeding Patterns Of Sheepshead (Archosargus Probatocephalus) In The Northwest Gulf Of Mexico, Elsa M. Gutierrez, Jeffrey D. Plumlee, Derek G. Bolser, Brad E. Erisman, R. J.David Wells Apr 2023

Regional Variation In Feeding Patterns Of Sheepshead (Archosargus Probatocephalus) In The Northwest Gulf Of Mexico, Elsa M. Gutierrez, Jeffrey D. Plumlee, Derek G. Bolser, Brad E. Erisman, R. J.David Wells

Faculty Publications

Feeding patterns of sheepshead, Archosargus probatocephalus, in the northwest Gulf of Mexico were examined from samples collected at two locations in Texas, USA; Galveston and Port Aransas. A total of 53 sheepshead stomachs (Galveston, n = 35; Port Aransas, n = 18) had their contents analyzed along with tissue samples from the muscle and liver for a stable isotope analysis (δ13C, δ15N, and δ34S) because they provide a contrast between short-term (liver) and long-term (muscle) measurements. Multiple species of amphipods made up the majority of the prey items in sheepshead from Galveston (%IRI = 61.79), whereas barnacles were the primary …

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Total Daily Energy Expenditure Has Declined Over The Past Three Decades Due To Declining Basal Expenditure, Not Reduced Activity Expenditure, John R. Speakman, Jasper M.A. De Jong, Srishti Sinha, Klaas R. Westerterp, Yosuke Yamada, Hiroyuki Sagayama, Philip N. Ainslie, Liam J. Anderson, Lenore Arab, Kweku Bedu-Addo, Stephane Blanc, Alberto G. Bonomi, Pascal Bovet, Soren Brage, Maciej S. Buchowski, Nancy F. Butte, Stefan G.J.A. Camps, Jamie A. Cooper, Richard Cooper, Sai Krupa Das, Peter S.W. Davies, Lara R. Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W. Fudge, Melanie Gillingham, Santu Ghosh, Annelies H. Goris, Michael Gurven, Lewis G. Halsey, Catherine Hambly, Hinke H. Haisma Apr 2023

Total Daily Energy Expenditure Has Declined Over The Past Three Decades Due To Declining Basal Expenditure, Not Reduced Activity Expenditure, John R. Speakman, Jasper M.A. De Jong, Srishti Sinha, Klaas R. Westerterp, Yosuke Yamada, Hiroyuki Sagayama, Philip N. Ainslie, Liam J. Anderson, Lenore Arab, Kweku Bedu-Addo, Stephane Blanc, Alberto G. Bonomi, Pascal Bovet, Soren Brage, Maciej S. Buchowski, Nancy F. Butte, Stefan G.J.A. Camps, Jamie A. Cooper, Richard Cooper, Sai Krupa Das, Peter S.W. Davies, Lara R. Dugas, Ulf Ekelund, Sonja Entringer, Terrence Forrester, Barry W. Fudge, Melanie Gillingham, Santu Ghosh, Annelies H. Goris, Michael Gurven, Lewis G. Halsey, Catherine Hambly, Hinke H. Haisma

Faculty Publications

Obesity is caused by a prolonged positive energy balance1,2. Whether reduced energy expenditure stemming from reduced activity levels contributes is debated3,4. Here we show that in both sexes, total energy expenditure (TEE) adjusted for body composition and age declined since the late 1980s, while adjusted activity energy expenditure increased over time. We use the International Atomic Energy Agency Doubly Labelled Water database on energy expenditure of adults in the United States and Europe (n = 4,799) to explore patterns in total (TEE: n = 4,799), basal (BEE: n = 1,432) and physical activity energy expenditure (n = 1,432) over time. …

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Evaluation Of Alternative Colony Hybridization Methods For Pathogenic Vibrios, Andrew M. Schwartz, Haley A. Marcotte, Crystal N. Johnson Apr 2023

Evaluation Of Alternative Colony Hybridization Methods For Pathogenic Vibrios, Andrew M. Schwartz, Haley A. Marcotte, Crystal N. Johnson

Faculty Publications

Vibrios, such as Vibrio parahaemolyticus, are naturally occurring halophilic bacteria that are a major cause of foodborne illness. Because of their autochthonous nature, managing vibrio levels in marine and estuarine environments is impossible. Instead, it is crucial to reliably enumerate their abundance to minimize human exposure. One method of achieving this is the direct plating/colony hybridization (DP/CH) method, which has been used to efficiently quantify pathogenic vibrios in oysters and other seafood products. Although successful, the method relies on proprietary resources. We examined alternative approaches, assessed the influence of the reagent suppliers’ source on enumeration accuracy, and made experimental adjustments …

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Genome-Wide Association Analysis Of Hyperspectral Reflectance Data To Dissect The Genetic Architecture Of Growth-Related Traits In Maize Under Plant Growth-Promoting Bacteria Inoculation, Rafael Massahiro Yassue, Giovanni Galli, Chun Peng James Chen, Roberto Fritsche-Neto, Gota Morota Apr 2023

Genome-Wide Association Analysis Of Hyperspectral Reflectance Data To Dissect The Genetic Architecture Of Growth-Related Traits In Maize Under Plant Growth-Promoting Bacteria Inoculation, Rafael Massahiro Yassue, Giovanni Galli, Chun Peng James Chen, Roberto Fritsche-Neto, Gota Morota

Faculty Publications

Plant growth-promoting bacteria (PGPB) may be of use for increasing crop yield and plant resilience to biotic and abiotic stressors. Using hyperspectral reflectance data to assess growth-related traits may shed light on the underlying genetics as such data can help assess biochemical and physiological traits. This study aimed to integrate hyperspectral reflectance data with genome-wide association analyses to examine maize growth-related traits under PGPB inoculation. A total of 360 inbred maize lines with 13,826 single nucleotide polymorphisms (SNPs) were evaluated with and without PGPB inoculation; 150 hyperspectral wavelength reflectances at 386–1021 nm and 131 hyperspectral indices were used in the …

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Large Eddy Simulation For Empirical Modeling Of The Wake Of Three Urban Air Mobility Vehicles, Denis-Gabriel Caprace, Andrew Ning Apr 2023

Large Eddy Simulation For Empirical Modeling Of The Wake Of Three Urban Air Mobility Vehicles, Denis-Gabriel Caprace, Andrew Ning

Faculty Publications

Recent advances in urban air mobility have driven the development of many new VTOL concepts. These vehicles often feature original designs departing from the conventional helicopter configuration. Due to their novelty, the characteristics of the super-vortices forming in the wake of such aircraft are unknown. However, these vortices may endanger any other vehicle evolving in their close proximity, owing to potentially large induced velocities. Therefore, improved knowledge about the wakes of VTOL vehicles is needed to guarantee safe urban air mobility operations. In this work, we study the wake of three VTOL aircraft in cruise by means of large eddy …

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24/7 Clean Energy, Todd S. Aagaard Apr 2023

24/7 Clean Energy, Todd S. Aagaard

Faculty Publications

In the face of the rapidly escalating climate crisis, the electricity sector is moving toward renewable energy. To date, policies and strategies have focused on increasing overall renewable energy generation, with little regard for timing and location. The result has been a misalignment of supply and demand in renewable energy markets. Renewable power projects produce energy when and where it is least expensive, leaving supply scarce at other times and places. Consumers, meanwhile, continue to use power when and where they need it. This mismatch increases the electricity grid’s dependence on fossil fuel–fired electricity to meet electricity demand at times …

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Research On The Total Channel Capacities Pertaining To Two Coverage Layouts For Three-Dimensional, Uav-Assisted Ad Hoc Networks, Xiao Yan, Shenglong Zhu, Qian Wang, Hsiao Chun Wu Apr 2023

Research On The Total Channel Capacities Pertaining To Two Coverage Layouts For Three-Dimensional, Uav-Assisted Ad Hoc Networks, Xiao Yan, Shenglong Zhu, Qian Wang, Hsiao Chun Wu

Faculty Publications

Unmanned aerial vehicles (UAVs) employed as airborne base stations (BSs) are considered the essential components in future sixth-generation wireless networks due to their mobility and line-of-sight communication links. For a UAV-assisted ad hoc network, its total channel capacity is greatly influenced by the deployment of UAV-BSs and the corresponding coverage layouts, where square and hexagonal cells are partitioned to divide the zones individual UAVs should serve. In this paper, the total channel capacities of these two kinds of coverage layouts are evaluated using our proposed novel computationally efficient channel capacity estimation scheme. The mean distance (MD) between a UAV-BS in …

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Acetate Formation On Metals Via Ch4 Carboxylation By Co2: A Dft Study, Md Saeedur Rahman, Ye Xu Apr 2023

Acetate Formation On Metals Via Ch4 Carboxylation By Co2: A Dft Study, Md Saeedur Rahman, Ye Xu

Faculty Publications

Density functional theory calculations have been performed to investigate CH4 activation and coupling to CO2 forming C2 carboxylates such as acetate on the close-packed (111) or (0001) surfaces of ten mid-to-late transition and coinage metals (Co, Ni, Cu, Ru, Rh, Pd, Ag, Ir, Pt, and Au). Consistent with the literature, the activation energy (Ea) for the initial C-H bond scission in CH4 is mild, being ca. 1 eV or less on all but the coinage metals, of which Ag exhibits the highest Ea at 2.13 eV, followed by Au and Cu. Ea for the CH3-CO2 coupling step is 0.8 ∼ …

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The Rise Of Machine Learning In Polymer Discovery, Cheng Yan, Guoqiang Li Apr 2023

The Rise Of Machine Learning In Polymer Discovery, Cheng Yan, Guoqiang Li

Faculty Publications

In the recent decades, with rapid development in computing power and algorithms, machine learning (ML) has exhibited its enormous potential in new polymer discovery. Herein, the history of ML is described and the basic process of ML accelerated polymer discovery is summarized. Next, the four steps in this process are reviewed, that is, dataset selection, fingerprinting, ML framework, and new polymer generation. Finally, a couple of main challenges for ML accelerated polymer discovery is presented and the outlooks in this field are prospected. It is expected that this review can service as a useful tool for the people who just …

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Unstructured-Grid Approach To Develop High-Fidelity Groundwater Model To Understand Groundwater Flow And Storage Responses To Excessive Groundwater Withdrawals In The Southern Hills Aquifer System In Southeastern Louisiana (Usa), Ye Hong Chen, Hamid Vahdat-Aboueshagh, Frank T.C. Tsai, Alyssa Dausman, Michael C. Runge Apr 2023

Unstructured-Grid Approach To Develop High-Fidelity Groundwater Model To Understand Groundwater Flow And Storage Responses To Excessive Groundwater Withdrawals In The Southern Hills Aquifer System In Southeastern Louisiana (Usa), Ye Hong Chen, Hamid Vahdat-Aboueshagh, Frank T.C. Tsai, Alyssa Dausman, Michael C. Runge

Faculty Publications

Study region: The Southern Hills aquifer system (SHAS) in the Louisiana Capital Area Groundwater Conservation District (CAGCD), USA. Study focus: The SHAS provides abundant groundwater for public and industrial supplies in the CAGCD. Groundwater depletion, saltwater intrusion, and land subsidence are potential concerns due to prolonged excessive groundwater withdrawals. This study develops a high-fidelity groundwater flow model utilizing a complex unstructured grid to investigate groundwater flow and storage responses to excessive groundwater withdrawals for the SHAS in the CAGCD. The groundwater model incorporates the Mississippi River alluvial aquifer down to the Miocene sands extending to depths around 1 km. New …

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Predicting Grocery Store Visits During The Early Outbreak Of Covid-19 With Machine Learning, Ruijie Bian, Pamela Murray-Tuite, Brian Wolshon Apr 2023

Predicting Grocery Store Visits During The Early Outbreak Of Covid-19 With Machine Learning, Ruijie Bian, Pamela Murray-Tuite, Brian Wolshon

Faculty Publications

While non-essential travel was canceled during the coronavirus infectious disease (COVID-19) pandemic, grocery shopping was essential. The objectives of this study were to: 1) examine how grocery store visits changed during the early outbreak of COVID-19, and 2) estimate a model to predict the change of grocery store visits in the future, within the same phase of the pandemic. The study period (February 15–May 31, 2020) covered the outbreak and phase-one re-opening. Six counties/states in the United States were examined. Grocery store visits (in-store or curbside pickup) increased over 20% when the national emergency was declared on March 13 and …

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Rise Of The Metaverse's Immersive Virtual Reality Malware And The Man-In-The-Room Attack & Defenses, Martin Vondráček, Ibrahim Baggili, Peter Casey, Mehdi Mekni Apr 2023

Rise Of The Metaverse's Immersive Virtual Reality Malware And The Man-In-The-Room Attack & Defenses, Martin Vondráček, Ibrahim Baggili, Peter Casey, Mehdi Mekni

Faculty Publications

The allure of the metaverse along with Virtual Reality (VR) technologies and speed at which they are deployed may shift focus away from security and privacy fundamentals. In this work we employ classic exploitation techniques against cutting edge devices to obtain equally novel results. The unique features of the Virtual Reality landscape set the stage for our primary account of a new attack, the Man-in-the-Room (MitR). This attack, realized from a vulnerable social networking application led to both worming and botnet capabilities being adapted for VR with potential critical impacts affecting millions of users. Our work improves the state-of-the-art in …

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Gas Hydrates Reserve Characterization Using Thermo-Hydro-Mechanical Numerical Simulation: A Case Study Of Green Canyon 955, Gulf Of Mexico, Sulav Dhakal, Ipsita Gupta Apr 2023

Gas Hydrates Reserve Characterization Using Thermo-Hydro-Mechanical Numerical Simulation: A Case Study Of Green Canyon 955, Gulf Of Mexico, Sulav Dhakal, Ipsita Gupta

Faculty Publications

The Gulf of Mexico is a widely explored and producing region for offshore oil and gas resources, with significant submarine methane hydrates. Estimates of hydrate saturation and distribution rely on drilling expeditions and seismic surveys that tend to provide either large-scale estimates or highly localized well data. In this study, hydrate reserve characterization is done using numerical simulation at Green Canyon block 955 (GC955). In addition, coupled thermo-hydro-mechanical (THM) simulation results show that hydrate saturation and geobody distribution are determined by the thermodynamic conditions as well as reservoir structures, stratigraphic differences, and permeability differences. Hydrate formation due to upflow of …

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