Digital Commons Network^™

The Library Is Not For Everyone (Yet): Disability, Accommodations, And Working In Libraries, Nicollette Davis, Mondo Vaden, Marco Seiferle-Valencia, Jess Saldaña, De Ann Brame

Faculty Publications

No abstract provided.

Decay Of Multi-Point Correlation Functions In Zd, Rui Han, Fan Yang

Faculty Publications

We prove multi-point correlation bounds in Z^d for arbitrary d≥1 with symmetrized distances, answering open questions proposed by Sims–Warzel (Commun Math Phys 347(3):903–931, 2016) and Aza–Bru–Siqueira Pedra (Commun Math Phys 360(2):715–726, 2018). As applications, we prove multi-point correlation bounds for the Ising model on Z^d, and multi-point dynamical localization in expectation for uniformly localized disordered systems, which provides the first examples of this conjectured phenomenon by Bravyi–König (Commun Math Phys 316(3):641–692, 2012).

Short-Term Sediment Dispersal On A Large Retreating Coastal River Delta Via 234th And 7be Sediment Geochronology: The Mississippi River Delta Front, Andrew Courtois, Samuel Bentley, Jillian Maloney, Kehui Xu, Jason Chaytor, Ioannis Y. Georgiou, Michael D. Miner, Jeffrey Obelcz, Navid H. Jafari, Melanie Damour

Faculty Publications

Many Mississippi River Delta studies have shown recent declines in fluvial sediment load from the river and associated land loss. In contrast, recent sedimentary processes on the subaqueous delta are less documented. To help address this knowledge gap, multicores were collected offshore from the three main river outlets at water depths of 25–280 m in June 2017 just after the peak river discharge period, with locations selected based on 2017 U.S. Geological Survey seabed mapping. The coring locations included the undisturbed upper foreset, mudflow lobes, gullies, and the undisturbed prodelta. Nine multicores were analyzed for Beryllium-7 activity, and four cores …

Structure Of The High-Spin, Β -Decaying State In The Neutron-Rich Nucleus La 146, S. Lalkovski, F. G. Kondev, K. Auranen, A. D. Ayangeakaa, M. P. Carpenter, J. A. Clark, P. Copp, N. P. Giha, D. J. Hartley, T. Lauritsen, S. Marley, G. E. Morgan, C. Müller-Gatermann, S. Nandi, W. Reviol, D. Santiago-Gonzalez, G. Savard, D. Seweryniak, Ir B. Vasilev, J. Wu

Faculty Publications

Excited structures in Ce146 were populated in β decay of the high-spin state in the neutron-rich nucleus La146. The beam was produced by the Californium Rare Isotope Breeder Upgrade (CARIBU) facility at Argonne National Laboratory, reaccelerated by the ATLAS accelerator, and implanted on a moving-tape system in the middle of the GAMMASPHERE array. The decay scheme of the high-spin, β-decaying state in La146 was revised with respect to previous studies and evaluated nuclear data. The structure of La146 is discussed in the framework of the deformed Nilsson model and systematics of known quasiparticle structures in the region.

Quantum Scalar Fields Interacting With Quantum Black Hole Asymptotic Regions, Rodolfo Gambini, Jorge Pullin

Faculty Publications

We continue our work on the study of spherically symmetric loop quantum gravity coupled to two spherically symmetric scalar fields, with one that acts as a clock. As a consequence of the presence of the latter, we can define a true Hamiltonian for the theory. In previous papers, we studied the theory for large values of the radial coordinate, i.e., far away from any black hole or star that may be present. This makes the calculations considerably more tractable. We have shown that in the asymptotic region, the theory admits a large family of quantum vacua for quantum matter fields …

Thermoelectric Properties Of Snse And Snse2 Single Crystals, Abhinna Rajbanshi, Daniel Duong, Eklavya Thareja, Williams A. Shelton, Rongying Jin

Faculty Publications

Thermoelectric materials can serve for conversion between thermal and electrical energy. In the search for thermoelectric materials, layered SnSe and SnSe2 are promising candidates. We have successfully synthesized SnSe and SnSe2 single crystals by the modified Bridgman method and studied their thermoelectric properties: thermopower (S), thermal conductivity (κ), and electrical conductivity (σ) in the temperature range between 2 and 400 K, which are absent in the literature. The kink observed in the thermopower corresponds to the metallic-nonmetallic crossover temperature for both SnSe and SnSe2, reflecting their inherent electronic nature. Compared with SnSe2, >100 K, we find that SnSe exhibits higher …

Engineering A Non-Hermitian Second-Order Topological Insulator State In Quasicrystals, Chakradhar Rangi, Ka Ming Tam, Juana Moreno

Faculty Publications

Non-Hermitian topological phases have gained immense attention due to their potential to unlock novel features beyond Hermitian bounds. PT-symmetric (parity time-reversal symmetric) non-Hermitian models have been studied extensively over the past decade. In recent years, the topological properties of general non-Hermitian models, regardless of the balance between gains and losses, have also attracted vast attention. Here, we propose a non-Hermitian second-order topological (SOT) insulator that hosts gapless corner states on a two-dimensional quasicrystalline lattice (QL). We first construct a non-Hermitian extension of the Bernevig-Hughes-Zhang model on a QL generated by the Amman-Beenker tiling. This model has real spectra and supports …

Motor Competence And Body Mass Index In The Preschool Years: A Pooled Cross-Sectional Analysis Of 5545 Children From Eight Countries, Clarice Martins, Vicente Romo-Perez, E. Kipling Webster, Michael Duncan, Luís Filipe Lemos, Amanda E. Staiano, Anthony Okely, Daniele Magistro, Fabio Carlevaro, Farid Bardid, Francesca Magno, Glauber Nobre, Isaac Estevan, Jorge Mota, Ke Ning, Leah E. Robinson, Matthieu Lenoir, Minghui Quan, Nadia C. Valentini, Penny Cross, Rachel Jones, Rafael Henrique, Si Tong Chen, Yucui Diao, Paulo R. Bandeira, Lisa M. Barnett

Population and Public Health Science Faculty Publications

Background and Objective: One in five preschool children are overweight/obese, and increased weight status over time increases the risks of poorer future health. Motor skill competence may be a protective factor, giving children the ability to participate in health-enhancing physical activity. Yet, we do not know when the relationship between motor competence and weight status first emerges or whether it is evident across the body mass index (BMI) spectrum. This study examined the association between motor skill competence and BMI in a multi-country sample of 5545 preschoolers (54.36 ± 9.15 months of age; 50.5% boys) from eight countries. Methods: Quantile …

Opposing Genetic Patterns Of Range Shifting Temperate And Tropical Gastropods In An Area Undergoing Tropicalisation, Karolina M. Zarzyczny, Michael E. Hellberg, Elena B. Lugli, Moira Maclean, David A. Paz-García, Marc Rius, Ethan G. Ross, Erick X. Treviño Balandra, James Vanstone, Suzanne T. Williams, Phillip B. Fenberg

Faculty Publications

Aim: The poleward range expansion of tropical species, and range contraction of temperate species (known as tropicalisation) has mainly been studied from an ecological perspective, with little research on its genetic consequences. Here, we used distributional and genetic data to document the consequences of tropicalisation in rocky shore gastropods and assess more broadly the future implications of tropicalisation on phylogeographic patterns. Location: Nineteen sampling sites along >3000 km of the eastern Pacific rocky intertidal zone, from the tip of the Baja California Peninsula to southern California. Taxon: Temperate gastropods: Lottia conus, L. strigatella, Fissurella volcano and Tegula gallina. Tropical gastropods: …

Irrigation Of Sand-Based Creeping Bentgrass Putting Greens With Nanobubble-Oxygenated Water, Eric J. Deboer, Michael D. Richardson, John H. Mccalla

Faculty Publications

Cultural and environmental factors can place creeping bentgrass (Agrostis stolonifera) under extreme stress during the summer months. This stress, coupled with the growth adaptation of creeping bentgrass, can result in shallow, poorly rooted stands of turf. To enhance root zone oxygen and rooting of creeping bentgrass, golf courses use methods such as core and solid-tine aerification, and sand topdressing. An additional method of delivering oxygen to the soil could be irrigation with nanobubble-oxygenated water. The properties of nanobubbles (NBs) allow for high gas dissolution rates in water. Irrigating with NB-oxygenated water sources may promote increased rooting of creeping bentgrass putting …

Hamiltonian Formulation And Symplectic Split-Operator Schemes For Time-Dependent Density-Functional-Theory Equations Of Electron Dynamics In Molecules, François Mauger, Cristel Chandre, Mette B. Gaarde, Kenneth Lopata, Kenneth J. Schafer

Faculty Publications

We revisit Kohn–Sham time-dependent density-functional theory (TDDFT) equations and show that they derive from a canonical Hamiltonian formalism. We use this geometric description of the TDDFT dynamics to define families of symplectic split-operator schemes that accurately and efficiently simulate the time propagation for certain classes of DFT functionals. We illustrate these with numerical simulations of the far-from-equilibrium electronic dynamics of a one-dimensional carbon chain. In these examples, we find that an optimized 4th order scheme provides a good compromise between the numerical complexity of each time step and the accuracy of the scheme. We also discuss how the Hamiltonian structure …

Sedimentary Processes And Instability On The Mississippi River Delta Front Near The Shipwreck Of The Ss Virginia, Nathan Figueredo, Samuel J. Bentley, Jason D. Chaytor, Kehui Xu, Navid Jafari, Ioannis Y. Georgiou, Melanie Damour, Jeffrey Duxbury, Jeffrey Obelcz, Jillian Maloney

Faculty Publications

Sediment cores were collected from a mudflow lobe (80 m water depth) offshore of the Mississippi River’s Southwest Pass in 2017 to better understand the sedimentology near the lobe entraining the SS Virginia shipwreck (sunk by a German U-boat in 1942) and surrounding Mississippi River delta front. Core analyses included ²¹⁰Pb/¹³⁷Cs geochronology, granulometry, and X-radiography. Sediment accumulation rates (SAR) calculated from excess ²¹⁰Pb activity in multicores are 0.22–0.29 cm/y at seabed depths less than 20 cm and 0.29–0.51 cm/y at depths greater than 20 cm. Accumulation rates for ¹³⁷Cs have been ~0.15 to ~0.37 cm/y …

Energy And Spectrum Efficient Federated Learning Via High-Precision Over-The-Air Computation, Liang Li, Chenpei Huang, Dian Shi, Hao Wang, Xiangwei Zhou, Minglei Shu, Miao Pan

Faculty Publications

Federated learning (FL) enables mobile devices to collaboratively learn a shared prediction model while keeping data locally. However, there are two major research challenges to practically deploy FL over mobile devices: (i) frequent wireless updates of huge size gradients v.s. limited spectrum resources, and (ii) energy-hungry FL communication and local computing during training v.s. battery-constrained mobile devices. To address those challenges, in this paper, we propose a novel multi-bit over-the-air computation (M-AirComp) approach for spectrum-efficient aggregation of local model updates in FL and further present an energy-efficient FL design for mobile devices. Specifically, a high-precision digital modulation scheme is designed …

A Focus Group Study Among Insufficiently Physically Active African American Adults Regarding Technology-Delivered Team-Based Gamification For Physical Activity Promotion, Courtney M. Monroe, Kristen Zosel, Melissa Stansbury, Nicholas Younginer, Rachel E. Davis, Gareth Dutton, Robert L. Newton, Bo Cai, Delia Smith West

Population and Public Health Science Faculty Publications

Background: Gamification represents a promising approach for facilitating positive social interactions among groups of individuals and is increasingly being leveraged in physical activity (PA) interventions to promote enhanced intervention engagement and PA outcomes. Although African American (AA) adults experience disparities associated with health conditions that can be ameliorated with increased PA, little is known about how best to culturally target PA gamification strategies for this population. The purpose of this study was to gather perspectives from AA adults residing in the Southeast United States and subsequently identify themes to help inform the cultural adaptation of an existing electronic and mobile …

Covariant Anyons Via Mackey Machinery, Radhakrishnan Balu

Journal of Stochastic Analysis

No abstract provided.

Yiannis Constantinidis "Petite Suite" For Violin And Piano Transcribed For Cello Quarte: Synthesizing Foreign Inspirations And Greek Folk Melodies To Shape A Distinct National And Individual Genre., Eirini Triantafyllia Barouta

LSU Doctoral Dissertations

This paper accompanies my transcription for Cello Quartet of Yiannis Constantinidis' "Petite Dodekanese Suite" originally composed for violin and piano. Constantinidis, skillfully weaves Greek folk-inspired elements with classical forms and techniques in his "Petite Suite for Violin and Piano." The chamber piece serves as a testament to Constantinidis' mastery, as it intricately melds folk melodies, rhythms, and modes from the rich musical traditions of Greece with classical structures. This fusion imparts a distinctly Greek character to the composition, evoking a profound sense of nostalgia and connecting the listener to the cultural heritage and spirit of the Greek people. The paper …

Power Grid Resiliency Enhancement Against Flood-Induced Hazards, Mohadese Movahednia

LSU Doctoral Dissertations

Natural disasters, such as floods, may damage power system assets and lead to widespread and long outages. The impact of flood can be alleviated by preventive actions such as installing tiger dams around power substations before the flood. In this regard, it is imperative that critical substations are identified in terms of the connected load and imposed costs to the system. This study presents a resource allocation approach for protecting power substations against flood events a day ahead of the event. First, the required information for the model is extracted. Flood probability distribution functions are used to generate several flood …

Auslander-Reiten Triangles On A Bounded Derived Category Of Constructible Complexes, Vishnu Prasad Sivaprasad

LSU Doctoral Dissertations

In this dissertation, concepts from homological algebra are used to study the existence of Auslander-Reiten triangles.

Auslander-Reiten triangles are closely related to representable functors, and the main theorem characterizes the existence of representable functors in a specific bounded derived category of constructible complexes.

Under certain boundedness conditions, a specific bounded derived category is shown to have Auslander-Reiten triangles.

In Search Of The Armorial Aesthetic: The Counter-Reform Of Ariano Suassuna And The Compositional Techniques In Clovis Pereira’S Suite Macambira, Wagner De Oliveira Duarte

LSU Doctoral Dissertations

Throughout the first half of the twentieth century, in the wake of the Week of Modern Art in São Paulo in 1922, Brazil grappled with defining its national identity, distinct from European influences. While eminent figures such as Villa-Lobos, Camargo Guarnieri, and Francisco Mignone provided foundational narratives in this quest, the Armorial movement emerged as a unique and emblematic response to these nationalistic aspirations.

Originating from the creative vision of Ariano Suassuna, the Armorial movement, though often perceived as a regional initiative, epitomized a broader endeavor to represent Brazil's diverse cultural tapestry. Central to understanding this movement is the work …

Application Of Learning Processes For Improving Last-Mile Logistics Optimization At Scale, Seyedeh Shaghayegh Rabbanian

LSU Doctoral Dissertations

The escalating demands of omnichannel retailing, rapid urbanization and shifting customer behaviors have propelled last-mile vehicle routing logistics to the forefront of research. This last-mile phase, recognized as a significant contributor to costs and pollution in the supply chain, necessitates efficient route optimization to minimize expenses and environmental impact. This research delves into machine learning based techniques for solving large-scale Vehicle Routing Problem (VRP), a fundamental concern in last-mile logistics, aiming to optimize delivery vehicle routing amidst diverse customer nodes and operational constraints. Three primary research subproblems are analyzed: utilizing machine learning for constructive solutions, Variable Neighborhood Search (VNS) metaheuristic, …

Women At Work: Pathways From Gender Stereotypes To Gender Bias And Discrimination, Madeline E. Heilman, Suzette Caleo, Francesca Manzi

Faculty Publications

Despite important advances, gender-based discrimination continues to hin-der women’s career progress. This review examines the role that gender stereotypes play in promoting gender bias and discrimination. After review- ing what is known about the content of gender stereotypes and examining both their descriptive and prescriptive aspects, we discuss two pathways through which stereotypes result in discrepant work outcomes for women and men. First, we consider how the characterization of women as com- munal but not agentic conflicts with the perceived demands of many male gender-typed jobs and fields, thus promoting perceptions of women’s lack of competence in those areas. Second, …

If You Build It, Will They Come? Assessing Habitat Quality For Marsh Birds At Created Marshes In Southeastern Louisiana, Katherine Aylett Lipford

LSU Master's Theses

Wetland loss occurs at an alarming pace globally, with extremely high rates along the northern Gulf of Mexico. Louisiana loses a football field of wetland every 100 minutes: that is 77,000 m² of wetland bird habitat lost daily. In Louisiana, marsh creation projects combat wetland loss, and while wildlife habitat is often used as a justification for restoration, wildlife receives little to no consideration during and after construction. Habitat characteristics such as site-specific hydrology, vegetation composition, and habitat structure affect the abundance of wetland birds and understanding these features is crucial to creating habitat that will benefit birds. My …

Death, Dreaming, And Diaspora: Achieving Orientation Through Afro-Spirituality, Liz Johnston, Jaime Elizabeth Johnston

LSU Doctoral Dissertations

Enslavement, colonization, and the systems that uphold racial injustice were and still are a series of new, unfathomable, and challenging experiences that prompt individuals within the diaspora to seek orientation. How does a human cope with centuries of attempts at the systematic destruction of their humanity, culture, and identity? How can they reclaim that identity, especially when so much of it seems lost? I address these questions by utilizing texts from the expansive body of work regarding ethnographic-historical-religious studies on Afro-spiritual practices to better analyze instances in literature in the ongoing practice of diasporic orientation. In this project, I argue …

The Relationship Between The Saharan Air Layer, Convective Environmental Conditions, And Precipitation In Puerto Rico, P. W. Miller, C. Ramseyer

Faculty Publications

The Saharan Air Layer (SAL) is a hot, dry, and dust-laden feature that advects large concentrations of dust across the Atlantic annually to destination regions in the Americas and Caribbean. However, recent work has suggested the SAL may be a contributing factor to high-impact drought in the Caribbean basin. While the SAL's characteristic dust loadings have been the focus of much previous research, fewer efforts have holistically engaged the co-evolution of the dust plume, its associated convective environment, and resultant rainfall in Caribbean islands. This study employs a self-organizing map (SOM) classification to identify the common trans-Atlantic dust transport typologies …

Structural Information On Supramolecular Copper(Ii) Β-Diketonate Complexes From Atomic Force Microscopy And Analytical Ultracentrifugation, Jonathan S. Casey, Ashley R. Walker, Xianglin Zhai, Jayne C. Garno, Paul S. Russo, Andrew W. Maverick

Faculty Publications

Supramolecular Cu(II) complexes were prepared from two trifunctional β-diketone ligands. The ligands (CH3Si(phacH)3 and CH3Si(phprH)3, represented by LH3) contain three aryl-β-diketone moieties joined by an organosilicon group. The complexes have the empirical formula Cu3L2, as expected for combinations of Cu²⁺ and L^3-. Several metal-organic polyhedra (MOPs) [Cu3L2]n are possible (n = 1-10); a dodecahedron (Cu30L20; n = 10; estimated diameter of ca. 5 nm) should be the most stable because its internal bond angles would come closest to ideal values. Atomic force microscopy (AFM), performed on samples deposited from solution onto mica substrates, revealed a distribution of …

Nonlinear Filtering Of Classical And Quantum Spin Systems, Sivaguru S. Sritharan, Saba Mudaliar

Journal of Stochastic Analysis

No abstract provided.

Machine-Learning-Assisted Leak Detection Using Distributed Temperature And Acoustic Sensors, Hayden Gemeinhardt, Jyotsna Sharma

Faculty Publications

Small leaks, many of which often go undetected using conventional gauges, remain an urgent problem for an aging pipeline infrastructure. This article proposes a method that allows for an automated and robust leak detection and localization system by fusing distributed acoustic sensor (DAS) and distributed temperature sensor (DTS) data for machine learning. Distributed fiber-optic sensing creates an advantage over conventional gauges by providing real-time continuous measurements along the entire length of the fiber-instrumented pipeline at a high spatiotemporal resolution and sensitivity that can detect small leaks, as well as the leak location. High sensitivity, however, can create noisy data. Thus, …

On Lightweight Shape Memory Vitrimer Composites, Siavash Sarrafan, Guoqiang Li

Faculty Publications

Lightweight materials are highly desired in many engineering applications. A popular approach to obtain lightweight polymers is to prepare polymeric syntactic foams by dispersing hollow particles, such as hollow glass microbubbles (HGMs), in a polymer matrix. Integrating shape memory vitrimers (SMVs) in fabricating these syntactic foams enhances their appeal due to the multifunctionality of SMVs. The SMV-based syntactic foams have many potential applications, including actuators, insulators, and sandwich cores. However, there is a knowledge gap in understanding the effect of the HGM volume fraction on different material properties and behaviors. In this study, we prepared an SMV-based syntactic foam to …

Free-Standing 3d Printing Of Epoxy-Vinyl Ether Structures Using Radical-Induced Cationic Frontal Polymerization, Brecklyn R. Groce, Alexandra V. Aucoin, Md Asmat Ullah, Jake Dicesare, Claire Wingfield, Jonathan Sardin, Jackson T. Harris, John C. Nguyen, Patrick Raley, Svetlana S. Stanley, Genevieve Palardy, John A. Pojman

Faculty Publications

The application of frontal polymerization to additive manufacturing has advantages in energy consumption and speed of printing. Additionally, with frontal polymerization, it is possible to print free-standing structures that require no supports. A resin was developed using a mixture of epoxies and vinyl ether with an iodonium salt and peroxide initiating system that frontally polymerizes through radical-induced cationic frontal polymerization. The formulation, which was optimized for reactivity, physical properties, and rheology, allowed the printing of free-standing structures. Increasing ratios of vinyl ether and reactive cycloaliphatic epoxide were found to increase the front velocity. Addition of carbon nanofibers increased the front …

Time, Place, & Purpose: The Performance Of Creole Identity In Louisiana, Rachel N. Aker

LSU Doctoral Dissertations

Though much of the early development of Louisiana Creole culture can be found in New Orleans, the culture spread and continued to grow throughout the rest of South Louisiana in both similar and different ways. Expanding beyond Joseph Roach’s treatment of Creole cultural performances in New Orleans in Cities of the Dead (1996) and journeying across land and water, this project identifies more Creole cultural performance as they emerge across place and time. I present Louisiana and the Gulf South as a kind of inland archipelago, with the currents of culture-creation moving in and around distinct community enclaves. The flow …