Digital Commons Network^™

Modelling The Effects Of Vegetation Distribution And Density On Hydrological Connectivity And Water Age In A River Delta, Madoche Jean Louis, Matthew Hiatt

Faculty Publications

Water transport timescales (WTTs) quantify how long it takes for water to travel through or remain in a system and are often cast as indicators of ecosystem function and health. Such timescales are known to be affected by vegetation in various environments. We quantify the impact of floodplain vegetation on WTTs within the Wax Lake Delta (WLD), a river delta system in Louisiana, USA, using a high-resolution Delft3D Flexible Mesh (DFM) model incorporating vegetation-induced flow resistance. We show that increased vegetation density leads to extended WTTs within vegetated sections of WLD while fostering flow localization and accelerating transport within distributary …

Modulators Of Energy Expenditure Accuracy In Adults With Overweight Or Obesity: E-Mechanic Secondary Analyses, Rachel Matthews, Christoph Höchsmann, Melissa L. Erickson, James L. Dorling, Guillaume Spielmann, Neil M. Johannsen, Timothy S. Church, Corby K. Martin

Faculty Publications

Purpose American College of Sports Medicine (ACSM) metabolic equations are used to estimate energy expenditure (EE) of physical activity and prescribe aerobic exercise to meet EE requirements. Limited evidence supports their accuracy in sedentary adults with overweight or obesity during controlled exercise interventions. The purpose of this study was to compare EE estimated by the ACSM walking equation versus EE measured by indirect calorimetry during a 24-wk aerobic exercise intervention, and identify potential modulators for their accuracy. Methods Data from the exercising groups (8 or 20 kcal·kg body weight-1·wk-1) of the E-MECHANIC study were utilized in this ancillary analysis (N …

Effect Of Training Status On Muscle Excitation And Neuromuscular Fatigue With Resistance Exercise With And Without Blood Flow Restriction In Young Men, Brett H. Davis, Guillaume Spielmann, Neil M. Johannsen, Victoria Fairchild, Timothy D. Allerton, Brian A. Irving

Faculty Publications

This study compared muscle (vastus lateralis) excitation, muscle activation, and neuromuscular fatigue in response to low-load resistance exercise with blood flow restriction (LLBFR), medium-load resistance exercise with blood flow restriction (MLBFR), and high-load resistance exercise (HLRE) in resistance-trained (RT; n = 15) and untrained (UT; n = 14) college-aged males. Muscle excitation and activation were measured using surface electromyography (sEMG) and defined as the maximal root mean square amplitudes (RMS AMP) and the integrated area under the sEMG curve (iEMG) per repetition. Neuromuscular fatigue was defined as the reduction in peak torque measured during the postexercise knee extensor maximal isometric …

Prompt Gamma-Ray Burst Recognition Through Waterfalls And Deep Learning, Michela Negro, Nicoló Cibrario, Eric Burns, Joshua Wood, Adam Goldstein, Tito Dal Canton

Faculty Publications

Gamma-ray bursts (GRBs) are one of the most energetic phenomena in the cosmos, whose study can probe physics extremes beyond the reach of laboratories on Earth. Our quest to unravel the origin of these events and understand their underlying physics is far from complete. Central to this pursuit is the rapid classification of GRBs to guide follow-up observations and analysis across the electromagnetic spectrum and beyond. Here, we introduce a compelling approach that can set a milestone toward a new and robust GRB prompt classification method. Leveraging self-supervised deep learning, we pioneer a previously unexplored data product to approach this …

Multiwavelength Analysis Of At 2023sva: A Luminous Orphan Afterglow With Evidence For A Structured Jet, Gokul P. Srinivasaragavan, Daniel A. Perley, Anna Y.Q. Ho, Brendan O’Connor, Antonio De Ugarte Postigo, Nikhil Sarin, S. Bradley Cenko, Jesper Sollerman, Lauren Rhodes, David A. Green, Dmitry S. Svinkin, Varun Bhalerao, Gaurav Waratkar, A. J. Nayana, Poonam Chandra, M. Coleman Miller, Daniele B. Malesani, Geoffrey Ryan, Suryansh Srijan, Eric C. Bellm, Eric Burns, David J. Titterington, Maria B. Stone, Josiah Purdum, Tomás Ahumada, G. C. Anupama, Sudhanshu Barway, Michael W. Coughlin, Andrew Drake, Rob Fender, José F. Agüí Fernández, Dmitry D. Frederiks, Stefan Geier

Faculty Publications

We present multiwavelength analysis of ZTF23abelseb (AT 2023sva), an optically discovered fast-fading (∆mr = 2.2 mag in ∆t = 0.74 d), luminous (Mr ∼ −30.0 mag), and red (g − r = 0.50 mag) transient at z = 2.28 with accompanying luminous radio emission. AT 2023sva does not possess a γ -ray burst (GRB) counterpart to an isotropic equivalent energy limit of Eγ,iso < 1.6 × 10⁵² erg, determined through searching γ -ray satellite archives between the last non-detection and first detection, making it the sixth example of an optically discovered afterglow with a redshift measurement and no detected GRB counterpart. We analyse …

A 3d Superposition Approximation For Gamma Knife Dose Calculation, Payton H. Stone, Lam M. Lay, Raymi Ramirez, Daniel Neck, Connel Chu, Joyoni Dey, David Solis

Faculty Publications

Effective dose calculation is essential for optimizing Gamma Knife (GK) stereotactic radiosurgery (SRS) treatment plans. Modern GK systems allow independent sector activation, enabling complex dose distributions per shot. This study presents a dose approximation method designed to account for shot flexibility and generate 3D doses external to GammaPlan. A treatment plan was created with the TMR10 calculation for individual sector activations using a Radiosurgery Head Phantom. The resulting dose arrays established a basis set of sector-specific distributions, which were then referenced by shot parameters from the plan, allowing dose accumulation through superposition. This superposition approximation (SA) was compared to the …

Ixpe Observation Of The Low-Synchrotron Peaked Blazar S4 0954+65 During An Optical-X-Ray Flare, Pouya M. Kouch, Ioannis Liodakis, Francesco Fenu, Haocheng Zhang, Stella Boula, Riccardo Middei, Laura Di Gesu, Georgios F. Paraschos, Iván Agudo, Svetlana G. Jorstad, Elina Lindfors, Alan P. Marscher, Henric Krawczynski, Michela Negro, Kun Hu, Dawoon E. Kim, Elisabetta Cavazzuti, Manel Errando, Dmitry Blinov, Anastasia Gourni, Sebastian Kiehlmann, Angelos Kourtidis, Nikos Mandarakas, Nikolaos Triantafyllou, Anna Vervelaki, George A. Borman, Evgenia N. Kopatskaya, Elena G. Larionova, Daria A. Morozova, Sergey S. Savchenko, Andrey A. Vasilyev, Ivan S. Troitskiy, Tatiana S. Grishina

Faculty Publications

The X-ray polarization observations, made possible with the Imaging X-ray Polarimetry Explorer (IXPE), offer new ways of probing high-energy emission processes in astrophysical jets from blazars. Here, we report the first X-ray polarization observation of the blazar S4 0954+65 in a high optical and X-ray state. During our multi-wavelength (MWL) campaign of the source, we detected an optical flare whose peak coincided with the peak of an X-ray flare. This optical-X-ray flare most likely took place in a feature moving along the parsec-scale jet, imaged at 43 GHz by the Very Long Baseline Array (VLBA). The 43 GHz polarization angle …

Structural And Magnetic Properties Of Cotemo O6, Yu Li, Jared Coles, Xin Gui, Hyowon Park, Yan Wu, Xinglong Chen, Jing Han Chen, Xiaoping Wang, Huibo Cao, Shane Stadler, Omar Chmaissem, David P. Young, Stephan Rosenkranz, John F. Ditusa

Faculty Publications

We have conducted a comprehensive investigation into the magnetic properties of the chiral multiferroic material CoTeMoO6. In contrast with the previous claim of canted antiferromagnetic order with ferromagnetic components [Y. Doi, J. Solid State Chem. 182, 3232 (2009)10.1016/j.jssc.2009.09.008], our investigation reveals an antiferromagnetic ground state with compensated moments, providing an interesting platform for exploring exotic material properties. Through careful measurements of magnetization under a series of applied fields, we demonstrate that there exist two sequential field-induced magnetic transitions in CoTeMoO6, with one occurring at Hc1=460 Oe along the a axis, and the other at Hc2=1.16 T with the field along …

Post-Wildfire Mobilization Of Organic Carbon, Travis Numan, Srinidhi Lokesh, Abrar Shahriar, Anil Timilsina, Myron L. Lard, Justin Clark, Yasaman Raeofy, Qian Zhao, Simon R. Poulson, Paul S. Verburg, Jocelyn A. Richardson, Robert L. Cook, Vera Samburova, Yu Yang

Faculty Publications

Wildfires significantly alter watershed functions, particularly the mobilization of organic carbon (OC). This study investigated OC mobility and the physicochemical characteristics of wildfire-impacted soils and ashes from the northern California and Nevada fires (Dixie, Beckworth, Caldor). Organic carbon in wildfire-derived ashes (9.2–57.3 mg/g) generally exceeded levels in the background soils (4.3–24.4 mg/g), except at the Dixie fire sites. The mobile OC fraction varied from 0.0093 to 0.029 in ashes and 0.010 to 0.065 in soils, though no consistent trend was observed between the ashes and soils. Notably, the ash samples displayed lower OC mobility compared with the soils beneath them. …

Comparing The Restoration Effect And Stress Recovery In Real And Virtual Environments With A Green Wall, Alireza Sedghikhanshir, Yan Chen, Yimin Zhu, Melissa R. Beck, Amirhosein Jafari

Faculty Publications

Biophilic design, incorporating natural elements, is known to enhance stress recovery. Immersive virtual environments (IVEs) are increasingly utilized for biophilic design validation and research, but their efficacy in replicating the restorative effects of real environments remains uncertain. Varying responses to virtual settings suggest that specific design factors may affect their effectiveness. This study provides a novel comparison of the stress recovery and restoration effect between real and virtual green walls in a controlled climate chamber. Sixty-three participants were exposed to either a real or virtual green wall for seven minutes after a 5 min stressor task. Physiological stress responses, including …

Time-Series Data-Driven Pm2.5 Forecasting: From Theoretical Framework To Empirical Analysis, Chunlai Wu, Ruiyang Wang, Siyu Lu, Jiawei Tian, Lirong Yin, Lei Wang, Wenfeng Zheng

Faculty Publications

PM2.5 in air pollution poses a significant threat to public health and the ecological environment. There is an urgent need to develop accurate PM2.5 prediction models to support decision-making and reduce risks. This review comprehensively explores the progress of PM2.5 concentration prediction, covering bibliometric trends, time series data characteristics, deep learning applications, and future development directions. This article obtained data on 2327 journal articles published from 2014 to 2024 from the WOS database. Bibliometric analysis shows that research output is growing rapidly, with China and the United States playing a leading role, and recent research is increasingly focusing on data-driven …

Speciation And Diffusive Dynamics In Hydrated Grain Boundaries Of Complex Oxide Gd2ti2o7, Dipta B. Ghosh, Bijaya B. Karki, Jianwei Wang

Faculty Publications

Grain boundaries in polycrystalline materials significantly affect their properties, such as ionic transport, corrosion, and chemical durability. The pyrochlore compound (Gd2Ti2O7) is employed as a model for complex oxides and is known for its diverse applications, including nuclear waste immobilization. Density functional theory-based first-principles molecular dynamics simulations were performed at different temperatures on the hydrated grain boundary system. The results show extensive transformations within the grain boundaries among hydrous water species (OH−, H2O, and H3O+). The temperature dependence of self-diffusion coefficients follows Arrhenius behavior, with an activation energy of 35.9 kJ/mol for hydrogen and 46.3 kJ/mol for oxygen. The lifetime …

Ornstein-Uhlenbeck Type Operators Induced By Some Geometric Structures On Complex Domains, Souheyl Jendoubu

Journal of Stochastic Analysis

No abstract provided.

Modulating The Aqueous Micellar Reorganization Of Sequence-Defined Ionic Peptoid Block Copolymers By Ionizable Monomer Position And Solution Ph, Bailee N. Barrett, Pedram Azizihariri, Vijay T. John, Donghui Zhang

Faculty Publications

The micellar aggregation of singly charged sequence-defined ionic peptoid block copolymers can be finely tuned by adjusting the position of the ionizable monomer along the chain and varying the solution pH. The pH-induced structural reorganization of these micelles was found to depend on the position of the ionizable monomer along the chain, influencing the balance of the hydrophobic interactions, excluded volume effect, and electrostatic forces (i.e., charge repulsion, solvation of the ionic monomers, counterion association) that govern the micellar structure. As the solution pH increases, positioning the ionizable monomer closer to the junction of the hydrophobic and hydrophilic blocks causes …

Quantum Extensions Of The Exotic Laplacians And Associated Quantum Heat Semigroups, Luigi Accardi, Un Cig Ji, Kimiaki Saito

Journal of Stochastic Analysis

No abstract provided.

The Zintl Pnictides Yb10cdsb9 And Yb14cdsb11: New Candidate Thermoelectric Materials, Michael O. Ogunbunmi, Kowsik Ghosh, Connor Donnelly, Sviatoslav Baranets, Svilen Bobev

Faculty Publications

The synthesis of new materials is the lifeline of solid-state science, and it continues to offer us unique opportunities for testing various theoretical formulations and models on a practical material. Such an avenue, therefore, provides a breeding ground for technological innovations and advancements that can completely revolutionize our world. Here, we report the results of our exploratory syntheses in the Yb-Cd-Sb compositional space that lead to the identification of two new Zintl antimonides, namely, Yb10CdSb9 and Yb14CdSb11. Their crystal structures were established via single-crystal X-ray diffraction methods; the basic electronic and transport properties of the new materials were also characterized. …

“Where War Is God And God Is War:” Women’S Religious Great War Poetry And Homefront Lines, Faith Ellington

LSU Doctoral Dissertations

This project seeks to redefine war’s poetic landscape. Through a focus on women’s Great War poetry, I argue against a dichotomous home front | front line poetic barrier and instead explore the intermingling of wartime spaces. Women’s WWI poetry, I argue, exists within a space I call the homefront lines, a space in which women produce writing from their full experiences of war regardless of combatant status. The homefront lines must be included in World War I literary canons in order to fully recognize the humanity of women during wartime and to fully grasp the war’s impact on poetry …

Preface, José Luis Da Silva, Un Cig Ji, Aurel Stan

Journal of Stochastic Analysis

No abstract provided.

Non-Orientable Surfaces Bounded By Knots, Megan K. Fairchild

LSU Doctoral Dissertations

The non-orientable 4-genus of a knot $K$ in $S^{3}$ is defined to be the minimum first Betti number of a non-orientable surface $F$ in $B^{4}$ so that $K$ bounds $F$. We will survey the tools used to compute the non-orientable 4-genus, and use various techniques to calculate this invariant for non-alternating 11 crossing knots, torus knots, and Whitehead doubles. We also will view obstructions to a knot bounding a M\"{o}bius band given by the double branched cover of $S^{3}$ branched over $K$. Additionally, we discuss the problem of the Whitehead double of the Figure 8 knot and survey commonly used …

Evaluation Of Soybean Response To Sulfur Fertilizer Rates And Sources, Md Enamul Haque Moni

LSU Master's Theses

Sulfur (S) deficiency has become a significant concern for producers due to over 90% reduction in atmospheric-S deposition since the “Clean Air Act” was established. Soil organic matter, another key source of S, is steadily declining due to continuous tillage. So, we evaluated soybean [Glycine max (L.) Merr.] yield and leaf-S concentration responses to six fertilizer-S rates (0, 11, 22, 34, 45, and 67 kg S ha⁻¹) across 50 site-years, and six fertilizer-S sources (no-S check, Ammonium Sulfate (AMS), Sul4r-Plus/Gypsum, K-Mag, Tiger90CR, and Poly4) across 9 site-years in Louisiana from 2023-2024. In S rate study, soybean yield responded positively to …

Weak Solutions Of Spdes In The Space Of Tempered Distributions, Suprio Bhar, Barun Sarkar

Journal of Stochastic Analysis

No abstract provided.

Empowering Sustainable Development: Solar Energy For Enhanced Weather Resilience, Aly Mousaad Aly

Faculty Publications

This paper examines the impact of photovoltaic (PV) panels on wind loads in low-rise buildings with gable roofs, emphasizing their potential to promote sustainable energy solutions while improving structural integrity. We hypothesize that PV panels can effectively reduce wind-induced forces on roofing components. Experiments using a 1:7.5 scale model in an open-jet wind facility compared bare roofs to those equipped with PV panels across three configurations. Results show that PV panels can decrease total wind forces on the roof by 45% to 63%, depending on configuration and wind direction. These findings suggest that additional structural reinforcement may not be necessary …

An Integrated Global-To-Regional Scale Workflow For Simulating Climate Change Impacts On Marine Ecosystems, Kelly Ortega-Cisneros, Denisse Fierros-Arcos, Max Lindmark, Camilla Novaglio, Phoebe Woodworth-Jefcoats, Tyler D. Eddy, Marta Coll, Elizabeth Fulton, Ricardo Oliveros-Ramos, Jonathan Reum, Yunne Jai Shin, Cathy Bulman, Leonardo Capitani, Samik Datta, Kieran Murphy, Alice Rogers, Lynne Shannon, George A. Whitehouse, Ezekiel Adekoya, Beatriz S. Dias, Alba Fuster-Alonso, Cecilie Hansen, Bérengère Husson, Vidette Mcgregor, Alaia Morell, Hem Nalini Morzaria Luna, Jazel Ouled-Cheikh, James Ruzicka, Jeroen Steenbeek, Ilaria Stollberg, Roshni C. Subramaniam, Vivitskaia Tulloch, Andrea Bryndum-Buchholz

Faculty Publications

As the urgency to evaluate the impacts of climate change on marine ecosystems increases, there is a need to develop robust projections and improve the uptake of ecosystem model outputs in policy and planning. Standardizing input and output data is a crucial step in evaluating and communicating results, but can be challenging when using models with diverse structures, assumptions, and outputs that address region-specific issues. We developed an implementation framework and workflow to standardize the climate and fishing forcings used by regional models contributing to the Fisheries and Marine Ecosystem Model Intercomparison Project (FishMIP) and to facilitate comparative analyses across …

Defect Bound States In The Continuum Of Bilayer Electronic Materials Without Symmetry Protection, Daniel Massatt, Stephen P. Shipman, Ilya Vekhter, Justin H. Wilson

Faculty Publications

We analyze a class of bound defect states in the continuum electronic spectrum of bilayer materials, which emerge independent of symmetry protection or additional degrees of freedom. Taking graphene as a prototypical example, our comparative analysis of AA- and AB-stacked bilayer graphene demonstrates that these states originate from the intrinsic algebraic structure of the tight-binding Hamiltonian when trigonal warping is neglected rather than any underlying symmetry. The inclusion of trigonal warping and higher-order hoppings broadens the bound states into long-lived resonances. This discovery provides a distinct pathway to defect and band-structure engineering. We conclude with a proposed protocol for observing …

Extragalactic Magnetar Giant Flare Grb 231115a: Insights From Fermi /Gbm Observations, Aaron C. Trigg, Rachael Stewart, Alex Van Kooten, Eric Burns, Matthew G. Baring, Dmitry D. Frederiks, Daniela Huppenkothen, Brendan O-Connor, Oliver J. Roberts, Zorawar Wadiasingh, George Younes, Narayana Bhat, Michael S. Briggs, Malte Busmann, Adam Goldstein, Daniel Gruen, Lei Hu, Chryssa Kouveliotou, Michela Negro, Antonella Palmese, Arno Riffeser, Lorenzo Scotton, Dmitry S. Svinkin, Peter Veres, Raphael Zöller

Faculty Publications

Magnetar giant flares (MGFs) are the extremely short, energetic transients originating from highly magnetized neutron stars. When observed in nearby galaxies, these rare events are nearly indistinguishable from cosmological short gamma-ray bursts. We present the analysis of GRB 231115A, a candidate extragalactic MGF observed by Fermi/GBM and localized by INTEGRAL to the starburst galaxy M82. This burst exhibits distinctive temporal and spectral characteristics, including a short duration and a high peak energy, consistent with known MGFs. Time-resolved analysis reveals rapid spectral evolution and a clear correlation between luminosity and spectral hardness, providing robust evidence of relativistic outflows. Archival Chandra data …

Beyond Water Surface Profiles: A New Iterative Methodology For 2d Model Calibration In Rivers Using Velocity Data From Multiple Cross-Sections, Fabian Rivera-Trejo, Gabriel Soto-Cortes, Kory M. Konsoer, Eddy J. Langendoen, Gaston Priego-Hernandez

Faculty Publications

Observed longitudinal water-surface profiles are commonly used to calibrate river hydrodynamic models, relying on assumptions of lateral uniformity in water surface elevation and velocity distribution. While suitable for 1D models, this approach has limitations in regard to 2D model calibration. When 2D flow measurements are available, a more robust quantitative evaluation is necessary to assess model accuracy. This study introduces a novel methodology to improve 2D model calibration and evaluate performance. High-resolution bathymetric and hydrodynamic data collected with a multibeam echosounder (MBES) and acoustic Doppler current profiler (ADCP) were aligned to compare observed and simulated flow velocities at matching spatial …

Assessing Water Quantity And Quality In The Mississippi River Valley Alluvial Aquifer And Coastal Louisiana Through Integrated Airborne Electromagnetic And Borehole Data, Michael George Henin Attia Khalil

LSU Doctoral Dissertations

Numerical modeling has contributed significantly to the understanding of groundwater systems. Many challenges are associated with constructing groundwater models which include an accurate understanding of the geology and aquifer parameters estimation. Traditionally boreholes are a successful way to capture geological features, however, boreholes often have sparse data. Airborne electromagnetic (AEM) data allows for efficient and cost-effective surveying of large areas, providing valuable information about the subsurface electrical resistivity. By bridging the gap between boreholes, AEM data offers a broader view of the aquifer system's structure and heterogeneity. However, interpreting geophysical AEM data has uncertainties. Developing a framework to apply the …

Supplemental Data For "Strong-Field Ionization With Few-Cycle, Mid-Infrared Laser Pulses Induces A Localized Ionization Followed By Long-Lasting Charge Migration In Halogenated Organic Molecules", Kyle A. Hamer, Mette B. Gaarde, François Mauger

Physics & Astronomy Datasets

Supplemental data for Hamer et al. (2024), which includes the time-dependent density-functional theory simulation data and Python scripts used to produce the figures in the paper.

This work was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Award No. DE-SC0012462. Portions of this research were conducted with high performance computational resources provided by Louisiana State University (http://www.hpc.lsu.edu) and the Louisiana Optical Network Infrastructure (http://www/loni.org).

Splitting Quintiles: Exploring The Relationship Between Income Inequality And Political Participation In The American Electorate, Laura E. Kaehler

LSU Doctoral Dissertations

The connection between economic inequality and unequal democratic engagement has inspired an enduring vein of interest since academic antiquity. Research suggests income inequality has a negative effect on political participation, yet a question remains among the American electorate: Do individuals across income groups share economic insecurities from increasing inequality or do distinct groups democratically disengage?

To empirically investigate, I consider the context of election salience and the contingent role that voter turnout misreporting or “faux-voters” play in this relationship. I dissect the “rich” verses “poor” distinction into five income groups to explore electoral motivations and malaise of middle-income individuals and …

A Family Of Markov Chains, Schur Functions, And Exterior Powers, Philip Feinsilver, John P. Mcsorley

Journal of Stochastic Analysis

No abstract provided.