Digital Commons Network^™

Coupling Between Bacterial Phylogenetic Diversity And Heterotrophic Productivity In A Coastal Ecosystem Affected By Estuarine Plumes, Yao Liu, Shujie Cai, Wenxin Fan, Wupeng Xiao, Xin Liu, Edward A. Laws, Bangqin Huang

Faculty Publications

Understanding the diversity-productivity relationship (DPR) is crucial for elucidating the ecological functions of marine bacterioplankton. However, studies have often focused on species diversity, neglecting phylogenetic diversity, which may offer deeper insights into the complex ecological processes shaping DPR in natural systems. This study addressed this gap by exploring the role of phylogenetic diversity in bacterioplankton productivity in the northern South China Sea, a coastal ecosystem influenced by estuarine plumes. We aimed to disentangle the mechanisms driving DPR and investigate how estuarine plumes modulate these processes. Our results show that the substantial enhancement of phytoplankton production by the Pearl River plume …

Challenges In Combating Climate Change: Lessons From Latin American And Caribbean Case Studies, Fabio Capra-Ribeiro

Faculty Publications

Climate change presents a complex global threat, particularly in Latin America and the Caribbean, where the impacts are severe, yet the region also showcases innovative approaches to face these issues. This study systematically analyzes the challenges faced by urban sustainability projects in the region, drawing insights from 35 case studies in the Urban Sustainability Exchange (USE) database. The primary objective is to identify shared challenges in implementing climate action initiatives, offering valuable lessons for future projects. Challenges were categorized into 14 themes, with issues related to collaboration and communication emerging as the most frequent. Other significant challenges included infrastructure limitations, …

A Systematic Review Of Environmentally Persistent Free Radical (Epfr) Formation, Characteristics, And Health Effects: Are There Sufficient Data For Risk Assessment?, Avinash Kumar, Divine Nde, Chuqi Guo, Rashmi Pathak, Fox Foley, Syed Ahmad, Prakash Dangal, Farhana Hasan, Myron Lard, Ankit Aryal, Martine E. Mathieu-Campbell, Jennifer Irving, Oluwafeyikemi Ogunmusi, Jennifer Richmond-Bryant, Slawomir Lomnicki, Lavrent Khachatryan, Stephania A. Cormier, Tammy R. Dugas

Faculty Publications

Environmentally persistent free radicals (EPFRs) are stable free radicals formed on particulate matter (PM) through processes such as combustion and pyrolysis. These free radicals are generated on transition metal oxide surfaces in the presence of aromatic precursors. Exposure to EPFRs occurs primarily via inhalation of PM deriving from combustion, traffic, industrial activities, and both indoor and outdoor burning. Other environmental factors that might generate EPFRs are radon, electronic and tobacco cigarettes. EPFRs exhibit unexpectedly long half-lives, ranging from several weeks to, in some cases, several years. EPFRs may be carbon-centered, oxygen-centered or mixed, identified by g-values exhibited in electron paramagnetic …

Convergence Of The Planewave Approximations For Quantum Incommensurate Systems, Ting Wang, Huajie Chen, Aihui Zhou, Yuzhi Zhou, Daniel Massatt

Faculty Publications

Incommensurate structures come from stacking the single layers of low dimensional materials on top of one another with misalignment such as a twist in orientation. While these structures are of significant physical interest, they pose many theoretical challenges due to the loss of periodicity. This paper studies the physical observables of continuum Schrodinger operators for incommensurate systems. We characterize the density of states and local density of states in real and reciprocal spaces, and develop novel numerical methods to approximate them. In particular, we (i) justify the thermodynamic limit of the density of states and local density of states via …

Realization Of Unitary Representations Of The Lorentz Group On De Sitter Space, Jan Frahm, Karl Hermann Neeb, Gestur Ólafsson

Faculty Publications

This paper builds on our previous work in which we showed that, for all connected semisimple linear Lie groups G acting on a non-compactly causal symmetric space M=G/H, every irreducible unitary representation of G can be realized by boundary value maps of holomorphic extensions in distributional sections of a vector bundle over M. In the present paper we discuss this procedure for the connected Lorentz group G=SO1,d(R)e acting on de Sitter space M=dS^d. We show in particular that the previously constructed nets of real subspaces satisfy the locality condition. Following ideas of Bros and Moschella from the 1990’s, …

Rethinking The Lake History Of Taylor Valley, Antarctica During The Ross Sea I Glaciation, Michael S. Stone, Peter T. Doran, Krista F. Myers

Faculty Publications

The Ross Sea I glaciation, marked by the northward advance of the Ross Ice Sheet (RIS) in the Ross Sea, east Antarctica, corresponds with the last major expansion of the West Antarctic Ice Sheet during the last glacial period. During its advance, the RIS was grounded along the southern Victoria Land coast, completely blocking the mouths of several of the McMurdo Dry Valleys (MDVs). Several authors have proposed that very large paleolakes, proglacial to the RIS, existed in many of the MDVs. Studies of these large paleolakes have been key in the interpretation of the regional landscape, climate, hydrology, and …

Machine Learning Enabled Measurements Of Astrophysical (P,N) Reactions With The Secar Recoil Separator, P. Tsintari, N. Dimitrakopoulos, R. Garg, K. Hermansen, C. Marshall, F. Montes, G. Perdikakis, H. Schatz, K. Setoodehnia, H. Arora, G. P.A. Berg, R. Bhandari, J. C. Blackmon, C. R. Brune, K. A. Chipps, M. Couder, C. Deibel, A. Hood, M. Horana Gamage, R. Jain, C. Maher, S. Miskovich, J. Pereira, T. Ruland, M. S. Smith, M. Smith, I. Sultana, C. Tinson, A. Tsantiri, A. Villari, L. Wagner, R. G.T. Zegers

Faculty Publications

The synthesis of heavy elements in supernovae is affected by low-energy (n,p) and (p,n) reactions on unstable nuclei, yet experimental data on such reaction rates are scarce. The SECAR (SEparator for CApture Reactions) recoil separator at FRIB (Facility for Rare Isotope Beams) was originally designed to measure astrophysical reactions that change the mass of a nucleus significantly. We used a novel approach that integrates machine learning with ion-optical simulations to find an ion-optical solution for the separator that enables the measurement of (p,n) reactions, despite the reaction leaving the mass of the nucleus nearly unchanged. A new measurement of the …

Spectroscopic Modeling Of Luminous Transients Powered By H-Rich And He-Rich Circumstellar Interaction, Gururaj A. Wagle, Emmanouil Chatzopoulos, Michael J. Baer

Faculty Publications

In this study, we perform detailed spectroscopic modeling to analyze the interaction of circumstellar material (CSM) with ejecta in both hydrogen-rich and hydrogen-poor superluminous supernovae (SLSNe), by systematically varying properties such as the CSM density, composition, and geometry to explore their effects on spectral lines and light-curve evolution. Using advanced radiative transfer simulations with the new, open-source SuperLite code to generate synthetic spectra, we identify key spectroscopic indicators of CSM characteristics. Our findings demonstrate that spectral lines of hydrogen and helium exhibit significant variations due to differences in CSM mass and composition. In hydrogen-rich Type II SLSNe, we observe pronounced …

Impact Report, 2024-2025, Lsu Libraries

Libraries Impact Reports

No abstract provided.

Editorial: Advancements And Challenges In Quantum Technologies Using Low-Dimensional Systems, Nanrun Zhou, Omar Magana-Loaiza, Clebson Cruz

Faculty Publications

No abstract provided.

Chip-Based Quantum Signature Network Reaches 200 Km, Chenglong You, Omar S. Magaña-Loaiza

Faculty Publications

A pioneering chip-based quantum digital signature (QDS) network achieves secure document signing over 200 km of fiber, leveraging integrated photonics to miniaturize transmitters and centralize measurement systems. This breakthrough paves the way for future scalable, cost-effective, and robust quantum-secure communication networks.

Reservoir Engineering For Co₂ Storage: Fundamental & Practical Aspects, Mehdi Zeidouni

LSU Faculty-Published Books

Bridging the gap between carbon storage theory and petroleum engineering practice.

This comprehensive guide distills nearly two decades of research and teaching into a clear, application-focused resource on geological CO2 storage modeling, carbon capture and storage modeling (CCS modeling), and CO2 reservoir modeling—all tailored specifically for petroleum engineers.

While GCS modeling has historically been driven by physics, mathematics, and hydrogeology, petroleum engineering CO2 modeling often requires a different approach. This book translates complex, multidisciplinary CO2 geological modeling techniques into a unified, petroleum engineer–friendly framework. Whether your focus is CO2 sequestration engineering, enhanced oil recovery CO2 modeling, or transitioning from oil …

Finding Belonging: The Search For Comprehensive Measurements Of Student Belonging In Math, H. Colleen Sinclair, Katie Bainbridge, Andrew R. Burns

Reports

This report provides the background, methods, and findings of Phase One of the development of a new instrument to assess belonging in math. It includes a review of existing instruments, their evaluation, and integration. It also includes findings from a panel about perceptions of belonging in school-aged students. Contents include: 1) a comprehensive definition of belonging, 2) a listing of existing belonging instruments, 3) a multidimensional breakdown of belonging that accounts for context and perspective, 4) a list of belonging items from existing scales that met coder face validity assessments, and 5) a definitionally grounded recommended set of belonging items …

Hydrogen And Deuterium Tunneling In Niobium, Abdulaziz Abogoda, W. A. Shelton, I. Vekhter, J. A. Sauls

Faculty Publications

We use density functional methods to identify the atomic configurations of H and D atoms trapped by O impurities embedded in bulk Nb. The O atoms are located at the octahedral position in the Nb body-centered cubic (BCC) lattice, and H (D) atoms tunnel between two degenerate tetrahedral sites separated by a mirror plane. Using nudged elastic band (NEB) methods, we calculate the double-well potential for O-H and O-D impurities and the wave functions and tunnel splittings for H and D atoms. Our results agree with those obtained from analysis of heat capacity and neutron scattering measurements on Nb with …

Exercise And Nutrition To Improve Cancer Treatment-Related Outcomes (Enicto), Kathryn H. Schmitz, Justin C. Brown, Melinda L. Irwin, Kim Robien, Jessica M. Scott, Nathan A. Berger, Bette Caan, Andrea Cercek, Tracy E. Crane, Scott R. Evans, Jennifer A. Ligibel, Jeffrey A. Meyerhardt, Tanya Agurs-Collins, Karen Basen-Engquist, Jennifer W. Bea, Sheng F. Cai, Brenda Cartmel, Vernon M. Chinchilli, Wendy Demark-Wahnefried, Christina M. Dieli-Conwright, Loretta Dipietro, Shawna E. Doerksen, Sharon L. Edelstein, Joanne Elena, William Evans, Leah M. Ferrucci, Julia Foldi, Sarah Freylersythe, Helena Furberg, Lee W. Jones, Ross Levine, Chaya S. Moskowitz, Cynthia Owusu

Faculty Publications

Chemotherapy treatment-related side effects are common and increase the risk of suboptimal outcomes. Exercise interventions during cancer treatment improve self-reported physical functioning, fatigue, anxiety, and depression, but it is unclear whether these interventions improve important clinical outcomes, such as chemotherapy relative dose intensity. The National Cancer Institute funded the Exercise and Nutrition to Improve Cancer Treatment-Related Outcomes (ENICTO) Consortium to address this knowledge gap. This article describes the mechanisms hypothesized to underpin intervention effects on clinically relevant treatment outcomes, briefly outlines each project’s distinct research aims, summarizes the scope and organizational structure of ENICTO, and provides an overview of the …

Louisiana Agriculture Magazine, Winter 2025, Lsu Agcenter

Louisiana Agriculture

LSU AgCenter nutrition education programs have always aimed to support the health and well-being of Louisianans. Helping residents eat healthier, be more physically active and maintain a healthy weight are important parts of disease prevention. Building healthy, thriving communities across Louisiana can support reduced healthcare costs, improved workforce productivity and an enhanced quality of life for everyone in our state.

All-Electron Molecular Tunnel Ionization Based On The Weak-Field Asymptotic Theory In The Integral Representation, Imam S. Wahyutama, Denawakage D. Jayasinghe, François Mauger, Kenneth Lopata, Kenneth J. Schafer

Faculty Publications

Tunnel ionization (TI) underlies many important ultrafast processes, such as high-harmonic generation and strong-field ionization. Among the existing theories for TI, many-electron weak-field asymptotic theory (ME-WFAT) is by design capable of accurately treating many-electron effects in TI. An earlier version of ME-WFAT relied on an accurate representation of the asymptotic tail of the orbitals, which hindered its implementation in Gaussian-basis-set-based quantum chemistry programs. In this work, we reformulate ME-WFAT in the integral representation, which makes the quality of the asymptotic tail much less critical, hence greatly facilitating its implementation in standard quantum chemistry packages. The integral reformulation introduced here is …

Lsu General Catalog 2025-2026, Louisiana State University And Agricultural And Mechanical College

LSU General Catalog

The LSU General Catalog describes all undergraduate and graduate departments and programs with degree requirements and courses offered for each one. The LSU General Catalog includes information on registration and financial aid as well as academic services offered to all students.

Mapping Glams: Creating A National Dataset Of Glams To Develop A Categorical Climate-Change Risk Assessment Scale, Edward Benoitiii, Jill Trepanier, Jennifer Vanos, Emily Fisher, Kaitlyn Bailey, Annie Waddell, Haley Moore, Mandy Hatman, Mary Sidwell, Symonne Russell, Virginia Seger, Paige Boutte, Amanda Latta, Zoe Mohammad, Kyriel Felton, Erin Deliman, Breanna Benson-Pearce, Wendy Johnson, Allyson Russell, Baillie Pretzer, Christopher Reeder, Melissa Mcconnell, Lisa Dahlke, Kaitlynn Melear, Lillian Bodi, Savannah T. Lyle, Zach Lannes, Gwen L. Wells, Benjamin A. Teincuff, Jason M. Straight, Tiffany Rockwell, Shane T. Manthei, Jennifer L. Benner

Faculty Publications

Introduction. The PROTECCT-GLAM project aims to assess and address climate risks for U.S. galleries, libraries, archives, and museums (GLAMs). The project team began with creating a national dataset of GLAMs. Method. The project team used existing datasets that required different auditing and manipulation techniques to align its data. Following the data normalization, the master file included 77,960 entries. Analysis and Results. The project team used ArcGIS Pro to analyze a dataset of galleries, libraries, archives, and museums (GLAMs) for risk from sea level rise, finding 16,877 GLAMs within 30 kilometres of the U.S. coast, with California, New York, Maryland, Florida, …

Advances In Tropical Climatology–A Review, Flávia D.S. Moraes, Craig Ramseyer, Paul W. Miller, Jill C. Trepanier

Faculty Publications

Understanding tropical climatology is essential to comprehending the atmospheric connections between the tropics and extratropical latitudes weather and climate events. In this review paper, we emphasize the advances in key areas of tropical climatology knowledge since the end of the 20th century and offer a summary, assessment, and discussion of previously published literature. Among the key areas analyzed here, we explore the advances in tropical oceanic and atmospheric variability, such as El Niño–Southern Oscillation and the Madden-Julian Oscillation, and how those teleconnection events have helped us to better understand variabilities in tropical monsoons, tropical cyclones, and drought events. We also …

Vertebrate Fossils Of Louisiana, Suyin Ting, Lorene E. Smith, Connor D. White, Irene Martí Gil

Special Publications of the Museum of Natural Science

No abstract provided.

An Early Web History Of Vaccine Skeptical Digital Rhetorics, Miles C. Coleman, Will Mari

Faculty Publications

Vaccine hesitancy is a public health threat stoked by vaccine skeptical rhetorics that circulate via the Web. While there is a body of work that studies the digital rhetorical tactics of vaccine skeptics, most of this work focuses on the Web rhetorics of the “Web 2.0” era, leaving the “Web 1.0” era relatively understudied and, in turn, foreclosing opportunities to look back before moving forward in the current moment. In efforts to yield glimpses into the antecedents of digital culture that have shaped contemporary vaccine skeptical discourses, in this article, we draw on systematically sourced website “snapshots” of vaccine skeptical …

Poromechanical Solution For One-Dimensional Large Strain Consolidation Of Modified Cam-Clay Soil, Sheng Li Chen, Hai Sui Yu, Younane N. Abousleiman, Christopher E. Kees

Faculty Publications

A theoretical model describing the one-dimensional large strain consolidation of the modified Cam-Clay soil is presented in this paper. The model is based on the Lagrangian formulation and is capable of featuring the variability of soil compressibility (inherently due to the direct incorporation of the specific Cam-Clay plasticity model) and permeability, as well as the impact of the overconsolidation ratio (OCR). The derivation starts from the establishment of the incremental stress–strain relations for both purely elastic and elastoplastic deformations under one-dimensional compression conditions, and thereafter the coefficients of compressibility/volume change that are essential to the consolidation analysis. The governing partial …

Statistical Investigation Of Gypsum Crystallization Kinetics, Azmain A. Akash

LSU Master's Theses

Gypsum, a naturally occurring mineral salt, is frequently encountered in industrial processes such as seawater desalination and power plant cooling. Over the years, significant effort has been devoted to controlling the crystallization of gypsum through various chemical approaches, including acidification, chelating agents, and antiscalant polymers. Nevertheless, the cost associated with chemical treatments may be reduced by incorporating physical operational strategies to complement chemical methods in regulating gypsum crystallization.

This study systematically examines the comparative roles of chemical and physical entropy in the gypsum crystallization process to elucidate their respective influences on gypsum growth kinetics. Chemical entropy is manipulated by adjusting …

A Network Analysis Of Social Determinants Of Health And Youth Suicidal Ideation And Suicide Attempts At The Neighborhood-Level In Houston, Tx, Tyler Hendley

LSU Master's Theses

Youth suicide is a complex, multi-faceted human phenomenon that has no singular cause but instead is theorized to be a result of an interplay of psychological, biological, and social risk and protective factors. To best identify youth suicide risk and possible avenues for intervention, a social-ecological model approach may prove beneficial. As community-level risk factors (i.e., social determinants of health (SDOH)) have shown to impact health outcomes, it is important to understand the association between community-level risk and youth suicide-related behaviors. Utilizing a network analytic approach, this study developed an estimated partial correlation network to understand the relationship between youth …

Clocking In And Speaking Out: Navigating Workday Rhythms For Voice Behaviors, Katelyn M. Reeves

LSU Master's Theses

Employee voice behaviors help organizations identify problems, increase productivity, and enhance satisfaction. Most literature focuses on daily-level variations while neglecting potential within-day variations that may have a stronger impact on voice engagement. To investigate within-day variations, this thesis applies chronotype synchrony to explain resource depletion throughout the day, which will determine voice engagement. An experience sampling study with the day reconstruction method of 250 employees revealed that having a morning chronotype leads to a more promotive and prohibitive voice in the morning, with a decline throughout the day due to resource depletion increasing throughout the day. Further, individuals with evening …

Physics-Informed Heterogeneous Spatiotemporal Graph Neural Network For Reservoir Simulation, Ahmed A.M.A. Abdullah

LSU Master's Theses

Reservoir simulation is the state-of-the-art method for predicting the flow of petroleum reservoir fluids in porous media. It provides an accurate and unbiased prediction of the performance of petroleum reservoirs under different operating conditions. Despite its advantages, reservoir simulation is computationally expensive; with typical full-field simulation models running for several hours. This limitation is worsened when simulating reservoirs with several equations for each cell, such as multiphysics or compositional reservoir simulation. The goal of this research is to provide a fast and accurate spatiotemporal machine-learning model that incorporates discretized governing mass balance equations for training. To achieve this, we propose …

Co2 In Flowing Freshwaters: Macro Scale Database Compilation, Addressing Ph Bias In Co2 Estimates, And Quantifying Cross-Scale Interactions, Timothy R. Toavs

LSU Doctoral Dissertations

This dissertation focuses on carbon dioxide (CO₂) dynamics in flowing freshwaters, contributing to the growing body of knowledge about inland water carbon cycles. The research is structured into three main chapters, each progressing towards the objective of utilizing variability in flowing freshwaters to further understand carbon dynamics, anthropogenic land cover impacts, and potential impacts from a changing climate. Chapter one compiles a 30-year dataset of pCO₂ measurements from flowing freshwater systems across the contiguous United States. This dataset, referred to as CDFLOW, includes over 750,000 pCO₂ estimates from more than 35,000 locations. It serves …

Phase Transitions In The Co-Doped Heusler Alloy Ni2mn1−Xcoxga, Jing Han Chen, Tej Poudel Chhetri, Nathaniel Wrobel, Xiaojian Bai, David P. Young, Igor Dubenko, Saikat Talapatra, Naushad Ali, Shane Stadler

Faculty Publications

The phase transitions of a series of Co-doped Heusler alloys, Ni 2 Mn 1 − x Co x Ga ( 0 ⩽ x ⩽ 0.2 ), were investigated experimentally using the magnetization measurements, x-ray diffraction, and calorimetric measurements up to their respective melting points. With increasing Co concentration, the structural transition temperatures, Curie temperatures, and melting points, were observed to increase, while the order-disorder transition temperatures decreased. Temperature-dependent x-ray diffraction experiments revealed two different crystal structures in the low-temperature martensite phase for different Co concentrations. However, above their respective structural transitions, both low-temperature crystal structures transformed into the L2 1 …

Nipping Crime In The Bud: The Spatial Relationship Between Crime And Meeting People’S Needs, Alicia Cerquone

LSU Master's Theses

The recent high-profile killings of people by the police brought attention to police violence, and prompted activists to call for an end to police violence. Drawing from an understanding of strain theory (Merton, 1938; Farnworth & Leiber, 1989; Agnew, 1992; Agnew, 2001; Agnew, 2008) and Tucker and Cadora’s (2003) ideas of justice reinvestment, this research was designed with the belief that police funding can be better used to help people meet their basic needs of housing, healthcare, and education. This research is concerned with the spatial relationship between crime and the quality of social infrastructure, or the programs in place …