Digital Commons Network^™

Adaptive Quantum Information Processing In Non-Equilibrium Environments, Arshag Danageozian

LSU Doctoral Dissertations

Solid state and condensed matter systems, such as diamond impurities, superconductors, quantum dots, and ion traps, constitute important physical platforms for various applications in quantum information processing (QIP). However, it has consistently been shown that all such modern platforms suffer from non-equilibrium behavior on timescales that are relevant for many important QIP tasks. The causes range from intrinsic non-equilibrium dynamics (e.g. in diamond) to the presence of various impurities with their own internal dynamics (e.g. in superconductors and quantum dots) or variations in the control fields used to stabilize the quantum matter (e.g. in ion traps). When reserving degrees of …

Femme Fatale In Lieder: Songs Of Lorelei By Clara Schumann, Franz Liszt, And Alexander Zemlinsky, Eun Chong Kang

LSU Doctoral Dissertations

The femme fatale, a seductive and dangerous woman, is a popular archetype found in literature, art, and music. In German literature, the character of Lorelei is a well-known example of the femme fatale. She is associated with a steep rock cliff on the Rhine River and, from the cliff, convicted of bewitching men resulting in their murder. This written document focuses on Lorelei as the femme fatale character in German literature as seen in three musical settings by composers Clara Schumann, Franz Liszt, and Alexander Zemlinsky. The document also includes limited musical analyses of and singer’s commentary on …

A Performer's Guide To Two Song Collections: “Mementos Of Innocence” And “Three Yeats Songs” By Malaysian Composer Chee Yean Wong, Wu Ji Khoo

LSU Doctoral Dissertations

Despite the flourishing existence of Asian Art Music for over half a century, relatively little has been done to advance its recognition and prominence. Through this project, the author hopes to shed light on the beauty and richness of Asian Art Music and encourage its inclusion in the repertoire of American classical music. The purpose of this document is to supply a comprehensive performer’s guide to Malaysian composer, Chee Yean Wong’s song collections: “Mementos of Innocence” and “Three Yeats Songs.” The collections feature settings of English poems by Jean Blewett, Christina Rossetti, Edwin C. Ranck, Rabindranath Tagore, and William Butler …

Phase Transitions And Magnetocaloric Effects In Metastable Phases Of Intermetallic Compounds, Tej Bahadur Poudel Chhetri

LSU Doctoral Dissertations

The interplay between spin and lattice degrees of freedom in magnetic materials often results in interesting magnetoresponsive effects. The magnetocaloric effect is one such magnetothermal phenomenon that may be utilized in energy-efficient magnetic cooling systems. This effect becomes more prominent near a coupling of magnetic and structural transitions, i.e., magnetostructural transitions (MSTs). This dissertation investigates phase transitions (magnetic and structural) in metastable phases of MnNiGe- and MnCoGe-based compounds generated through high-pressure synthesis/annealing and thermal quenching techniques and assesses their magnetocaloric effects.

First, the effects of doping, hydrostatic pressure, and thermal quenching on phase transitions and related magnetocaloric effects in Mn …

Empowering Student Success: Unlocking The Potential Of Project-Based Steel Design Education, Aly Mousaad Aly

Faculty Publications

In the pursuit of student success, it is essential to acknowledge that a singular teaching style does not universally cater to all students. The educator's crucial role lies in creating an optimal learning environment that fosters students' endeavors to excel. This endeavor transcends mere classroom success or employment prospects, encompassing a broader impact on societal well-being. An experiential learning approach, where students actively engage in practical tasks, emerges as the most effective mode of instruction. Integrating project-based learning activities into the curriculum holds immense potential for enhancing student learning. Additionally, the utilization of analysis software tools like FTool and STAAD …

Multiplication Operators By White Noise Delta Functions And Associated Differential Equations, Luigi Accardi, Un Cig Ji, Kimiaki Saitô

Journal of Stochastic Analysis

No abstract provided.

Crisis Leadership In Higher Education: A Case Study Of Administrative Responses During A National Pandemic, Katelyn M. Gerlach

LSU Doctoral Dissertations

ABSTRACT

The purpose of this qualitative case study was to explore institutional crisis leadership during a global pandemic in the athletic departments of five mid-major universities located in the Midwest United States, including Blue University, Red University, Green University, Orange University, and Purple University. This study examined the leadership response and decisions surrounding the COVID 19 pandemic. Research leaders consisted of members of the university’s executive leadership team and the athletic departments senior staffs.

I have gathered data in one-on-one, in person and virtual interviews with each member of the executive teams and gained insight and understanding of their leadership …

Determining Ion Activity Coefficients In Ion-Exchange Membranes With Machine Learning And Molecular Dynamics Simulations, Hishara Keshani Gallage Dona, Teslim Olayiwola, Luis A. Briceno-Mena, Christopher G. Arges, Revati Kumar, Jose A. Romagnoli

Faculty Publications

The activity coefficients of ions in polymeric ion-exchange membranes (IEMs) dictate the equilibrium partitioning coefficient of the ions between the membrane and the liquid. It also affects ion transport processes, such as conductivity, in ion-exchange membranes. Accurately predicting the ion activity coefficient without experimental data has been elusive as most models are empirical or semi-empirical. This work employs an embedding process that maps microscopic and macroscopic properties for modeling of ion activity coefficients in IEMs with molecular dynamics (MD) and machine learning (ML). This strategy is effective for accurately predicting activity coefficients in various IEM materials, including random copolymer and …

Reasoning The Voice: Toward A Diagnostic And Prescriptive Technique In The Teaching Of Singing, Carlos E. Santelli

LSU Doctoral Dissertations

Voice pedagogy literature often draws a parallel between a doctor’s ability to diagnose illness and prescribe treatment, and a voice teacher’s ability to identify vocal obstacles and design solutions. The core of these parallel procedures lies in an ability to utilize critical reasoning skills within highly specific contexts. Medical literature describes this as “clinical reasoning” and has studied it as a learned process. Voice pedagogy literature has traditionally described this as an innate process which is solely developed through experience. This document broadly examines the ways in which medical literature has broken down clinical reasoning into specific cognitive processes and …

Further Refinement Of An Asd-Subscale For The Childhood Behavior Checklist, Kimberly Ellison

LSU Doctoral Dissertations

The early diagnosis of autism spectrum disorder (ASD) is tied to receiving the earliest possible intervention services that can influence a child’s development (Filipek et al., 1999). There are different measurement tools utilized to aid in the diagnostic assessment process, including broadband behavioral rating scales. The Childhood Behavior Checklist (CBCL; Achenbach & Rescorla, 2001) is a parent/caregiver completed questionnaire about one’s child (typically or atypically developing). The CBCL is one of the most utilized broadband measures at the initial stages of a diagnostic assessment or screening to aid in understanding the symptom presentation (Hyman et al., 2020). Currently, there …

Opinion: How Fear Of Nuclear Winter Has Helped Save The World, So Far, Alan Robock, Lili Xia, Cheryl S. Harrison, Joshua Coupe, Owen B. Toon, Charles G. Bardeen

Faculty Publications

The direct effects of nuclear war would be horrific, with blasts, fires, and radiation killing and injuring many people. But in 1983, United States and Soviet Union scientists showed that a nuclear war could also produce a nuclear winter, with catastrophic consequences for global food supplies for people far removed from the conflict. Smoke from fires ignited by nuclear weapons exploded on cities and industrial targets would block out sunlight, causing dark, cold, and dry surface conditions, producing a nuclear winter, with surface temperatures below freezing even in summer for years. Nuclear winter theory helped to end the nuclear arms …

Algorithm 1035: A Gradient-Based Implementation Of The Polyhedral Active Set Algorithm, William W. Hager, Hongchao Zhang

Faculty Publications

The Polyhedral Active Set Algorithm (PASA) is designed to optimize a general nonlinear function over a polyhedron. Phase one of the algorithm is a nonmonotone gradient projection algorithm, while phase two is an active set algorithm that explores faces of the constraint polyhedron. A gradient-based implementation is presented, where a projected version of the conjugate gradient algorithm is employed in phase two. Asymptotically, only phase two is performed. Comparisons are given with IPOPT using polyhedral-constrained problems from CUTEst and the Maros/Meszaros quadratic programming test set.

Random Variables With Overlapping Number And Weyl Algebras Ii, Ruma Dutta, Gabriela Popa, Aurel Stan

Journal of Stochastic Analysis

No abstract provided.

Analysis Of Globally Propagating Spherical Shockwaves From Great Volcano Eruptions Using Barometric Pressure Data, Chunyan Li

Faculty Publications

Here, we present a protocol for the analysis of barometric pressure data from multiple stations for the globally propagating spherical shockwaves generated by catastrophic explosions. We demonstrate the analytical procedure using the Tonga underwater volcano eruption of January 2022. We also present a protocol to make a data recorder using off-the-shelf electronic components for barometric pressure measurements at ∼1 Hz. The data recorder and the analysis protocol can be used to study similar future catastrophic events. For complete details on the use and execution of this protocol, please refer to Li (2022).¹

Food Insecurity Among Households With Children During The Early Months Of The Covid-19 Pandemic, Bailey Houghtaling, Megan M. Patton-López, Lindsey Haynes-Maslow, Nila Pradhananga, Lauri Andress, T. Elaine Prewitt, Annie Hardison-Moody, Justin D. Shanks, Michelle Grocke-Dewey, Eliza Webber, Denise Holston, Carmen Byker Shanks

Faculty Publications

Understanding impacts of the COVID-19 pandemic among households with children is necessary to design appropriate public health responses that protect food and nutrition security. The objecttive of this research was to understand predictors of food insecurity during the COVID-19 pandemic among households with at least one child (<18 >years), including whether foods reported as out-ofstock were associated with the likelihood of food insecurity. An online survey using validated measures and open-ended questions was distributed to a convenience sample in five states— Louisiana, Montana, North Carolina, Oregon, and West Virginia—during the early months of the COVID-19 pandemic (April through September of …

Effects Of Carao (Cassia Grandis L.) On Physico-Chemical, Microbiological And Rheological Characteristics Of Yogurt, Luis Medina, Ricardo S. Aleman, Roberto Cedillos, Kayanush Aryana, Douglas W. Olson, Jhunior Marcia, Charles Boeneke

Faculty Publications

Yogurt fortification with functional ingredients can increase health benefits. Carao fruit has bioactive compounds which could exert antidiabetic potential. Objective was to study the influence of carao powder on physicochemical, microbiological, and rheological properties of yogurt. Carao powder was added at 0, 1.3, 2.65, and 5.3 g/L to milk to produce yogurt, which was stored for 42 days. The pH, titratable acidity (TA), syneresis, color, Streptococcus thermophilus (ST) and Lactobacillus delbrueckii spp. bulgaricus (LB) counts, viscosity, steady shear flow, thixotropic analysis, and frequency sweep measurements were evaluated over yogurt shelf life. The protease activity of yogurt starter culture bacteria and …

Deficiency In The Omega-3 Lysolipid Transporter Mfsd2a Leads To Aberrant Oligodendrocyte Lineage Development And Hypomyelination, Vetrivel Sengottuvel, Monalisa Hota, Jeongah Oh, Dwight L. Galam, Bernice H. Wong, Markus R. Wenk, Sujoy Ghosh, Federico Torta, David L. Silver

Division of Basic Science Faculty Publications

Patients with autosomal recessive microcephaly 15 caused by deficiency in the sodium-dependent lysophosphatidylcholine (LPC) transporter major facilitator superfamily domain–containing 2a (Mfsd2a) present with both microcephaly and hypomyelination, suggesting an important role for LPC uptake by oligodendrocytes in the process of myelination. Here we demonstrate that Mfsd2a is specifically expressed in oligodendrocyte precursor cells (OPCs) and is critical for oligodendrocyte development. Single-cell sequencing of the oligodendrocyte lineage revealed that OPCs from OPC-specific Mfsd2a-KO mice (2aOKO mice) underwent precocious differentiation into immature oligodendrocytes and impaired maturation into myelinating oligodendrocytes, correlating with postnatal brain hypomyelination. 2aOKO mice did not exhibit microcephaly, a finding …

Investigation Of Iron(Iii) Tetraphenylporphyrin As A Redox Flow Battery Anolyte: Unexpected Side Reactivity With The Electrolyte, Nathan H. Mitchell, Noémie Elgrishi

Faculty Publications

Redox flow batteries (RFBs) present an opportunity to bridge the gap between the intermittent availability of green energy sources and the need for on-demand grid level energy storage. While aqueous vanadium-based redox flow batteries have been commercialized, they are limited by the constraints of using water as an electrochemical solvent. Nonaqueous redox flow battery systems can be used to produce high voltage batteries due to the larger electrochemical window in nonaqueous solvents and the ability to tune the redox properties of active materials through functionalization. Iron porphyrins, a class of organometallic macrocycles, have been the subject of many studies for …

Tectonic Advection Of Contacts Enhances Landscape Transience, Nate Mitchell, Adam M. Forte

Faculty Publications

Contrasts in bedrock erodibility have been shown to drive landscape transience, but it is unclear whether horizontal tectonic displacements would enhance such effects. Furthermore, one might expect these factors to coexist, as tectonic convergence helps to create rock strength contrasts in settings like the Himalayas. How do landscapes respond when contacts separating units are raised vertically and shifted horizontally by tectonics? To evaluate such questions, we use landscape evolution models to simulate the exposure of a weak unit in a landscape equilibrated to a strong unit. We explore different simulations varying factors like weak unit erodibility, diffusivity, contact dip, and …

Cr-Containing Diamond-Like Carbon Coatings Deposited On 316 Stainless Steel Substrates: Characterization And Interfacial Fracture Toughness Measurements, N. J. Anderson, Bin Zhang, A. C. Meng, Xiaoman Zhang, K. P. Lijesh, M. M. Khonsari, W. J. Meng

Faculty Publications

A series of Cr-containing hydrogenated amorphous carbon (a-C:H:Cr) coatings were deposited onto 316 stainless steel (316SS) substrates using inductively coupled plasma assisted reactive sputter deposition. Elemental Cr interlayers with different thicknesses of 100, 200, and 300 nm were deposited between a-C:H:Cr and 316SS. Detailed composition, structure, and mechanical behavior characterization of deposited a-C:H:Cr/Cr/316SS specimens were performed. Fracture toughness values of the a-C:H:Cr layer, the Cr layer, and the a-C:H:Cr/Cr/316SS interfacial regions were measured by bending of microcantilever beams with focused ion beam milled pre-notches in-situ a scanning electron microscope. Measured fracture toughness of a-C:H:Cr/Cr/316SS interfacial regions exhibits an approximately linear …

Simulations Of Intruder-Free X-Ray Transient Absorption And Time-Resolved X-Ray Scattering For Probing Attosecond Electron Dynamics, Mengqi Yang

LSU Doctoral Dissertations

The motion of electrons plays a fundamental role in both physics and chemistry, and capturing such dynamics requires the ability to resolve changes at the attosecond timescale, which is enabled by the advent of ultrashort laser pulses. This dissertation aims to facilitate the interpretation of ultrafast electron dynamics and attosecond spectroscopy by real-time time-dependent density functional theory (RT-TDDFT) simulations. The first part of this dissertation focuses on improving the simulation of X-ray transient absorption spectra (XTAS) with Gaussian basis sets in RT-TDDFT by applying a filter to the transition dipole matrix. Due to the spatial limitation of atom-centered Gaussian functions, …

Pathways To Blunted Facial Affect In Negative Schizotypy: Social Motivation And Online Cognitive Resources, Tovah M.D. Cowan

LSU Doctoral Dissertations

Schizotypy, a range of personality traits which confer liability for schizophrenia, is associated with significantly diminished social functioning and quality of life. Social dysfunction in all forms of schizotypy, including schizophrenia, is connected to blunted affect, or diminished expressivity, particularly facial expressions which are less frequent, intense, or long than typical. However, the mechanisms and treatments for blunted affect are, as yet, poorly understood and underdeveloped. In this project, two putative mechanisms of blunted affect were explored. The first involves cognitive load capacities, which are diminished in schizotypy, causing blunted affect – individuals do not have the cognitive resources to …

Development Of A Definition Of Postacute Sequelae Of Sars-Cov-2 Infection, Tanayott Thaweethai, Sarah E. Jolley, Elizabeth W. Karlson, Emily B. Levitan, Bruce Levy, Grace A. Mccomsey, Lisa Mccorkell, Girish N. Nadkarni, Sairam Parthasarathy, Upinder Singh, Tiffany A. Walker, Caitlin A. Selvaggi, Daniel J. Shinnick, Carolin C.M. Schulte, Rachel Atchley-Challenner, Leora I. Horwitz, Andrea S. Foulkes, George A. Alba, Radica Alicic, Natasha Altman, Khamal Anglin, Urania Argueta, Hassan Ashktorab, Gaston Baslet, Ingrid V. Bassett, Lucinda Bateman, Brahmchetna Bedi, Shamik Bhattacharyya, Marie Abele Bind, Andra L. Blomkalns, Hector Bonilla, Patricia A. Bush, Mario Castro, James Chan

Division of Basic Science Faculty Publications

Importance: SARS-CoV-2 infection is associated with persistent, relapsing, or new symptoms or other health effects occurring after acute infection, termed postacute sequelae of SARS-CoV-2 infection (PASC), also known as long COVID. Characterizing PASC requires analysis of prospectively and uniformly collected data from diverse uninfected and infected individuals. Objective: To develop a definition of PASC using self-reported symptoms and describe PASC frequencies across cohorts, vaccination status, and number of infections. Design, Setting, and Participants: Prospective observational cohort study of adults with and without SARS-CoV-2 infection at 85 enrolling sites (hospitals, health centers, community organizations) located in 33 states plus Washington, DC, …

Nutrition Interventions Addressing Structural Racism: A Scoping Review, Matthew Greene, Bailey Houghtaling, Claire Sadeghzadeh, Molly De Marco, De'jerra Bryant, Randa Morgan, Denise Holston

Faculty Publications

African Americans experience high rates of obesity and food insecurity in part due to structural racism, or overlapping discriminatory systems and practices in housing, education, employment, health care and other settings. Nutrition education and nutrition-focused policy, systems and environmental changes may be able to address structural racism in the food environment. This scoping review aimed to summarise the available literature regarding nutrition interventions for African Americans that address structural racism in the food environment and compare them with the 'Getting to Equity in Obesity Prevention' framework of suggested interventions. An electronic literature search was conducted with the assistance of a …

Behavioral Interventions For Treating Childhood Obesity, William J. Heerman, Ian M. Paul, Amanda E. Staiano

Population and Public Health Science Faculty Publications

No abstract provided.

Cycles And Dynamic Correlations Between Agricultural And Stock Markets, Junior E. Betanco Gunera

LSU Master's Theses

This study conducts two interrelated econometric analyses; it first analyzes the cyclical relationship between stock and commodity markets and second, it studies the dynamic conditional correlation between them. The cyclical analysis uses the bandpass filter proposed by Christiano-Fitzgerald (2003) to isolate the trend component in the long-run relationship of stocks relative to commodity markets. The results show that stock and commodities have alternated in return leadership nine times during the last 151 years, three full cycles (from peak to peak) can be clearly identified, each one with an average duration of 31 years. While the COVID-19 pandemic had little impact …

A Comparison Of Self-Report Measures To Screen For Mental Health Concerns In Youth, Jacob Landon Deboer

LSU Doctoral Dissertations

Proactive screening for treatable conditions is not a new concept. Instead, screening has been present in the United States since at least the early 1900s. Accordingly, many schools actively screen for academic problems, yet the same attention is not paid to mental health. Past research estimates that one out of five children in the U.S. has a mental health disorder. However, recent research conducted during the COVID-19 pandemic has found these numbers to be increasing. Additional estimates suggest that only one-third of children with a mental health disorder receive treatment. Schools have a role to play in addressing the identification …

Sedimentary Processes And Instability On The Mississippi River Delta Front Near The Wreck Of The Ss Virginia, Nathan Figueredo

LSU Doctoral Dissertations

Multi-cores and piston cores were collected seaward of the Mississippi River Delta’s Southwest Pass at ~80 m water depth in 2017 to better understand sedimentary characteristics and processes on the Mississippi River Delta Front (MRDF) in the vicinity of the SS Virginia shipwreck, and to support marine archeological research. Core analyses were performed to inform our understanding of the dynamics of sediment motion in the study area through radionuclide activity (²¹⁰Pb and ¹³⁷Cs), volume frequency of grain size, bulk density, and fabric (X-Radiography). Sediment accumulation rates (SAR), calculated from multi-core ²¹⁰Pb activity are 0.22 - 0.29 …

Active Colloids As Models, Materials, And Machines, Kyle J.M. Bishop, Sibani Lisa Biswal, Bhuvnesh Bharti

Faculty Publications

Active colloids use energy input at the particle level to propel persistent motion and direct dynamic assemblies. We consider three types of colloids animated by chemical reactions, time-varying magnetic fields, and electric currents. For each type, we review the basic propulsion mechanisms at the particle level and discuss their consequences for collective behaviors in particle ensembles. These microscopic systems provide useful experimental models of nonequilibrium many-body physics in which dissipative currents break time-reversal symmetry. Freed from the constraints of thermodynamic equilibrium, active colloids assemble to form materials that move, reconfigure, heal, and adapt. Colloidal machines based on engineered particles and …

Zeolite Supported Pt For Depolymerization Of Polyethylene By Induction Heating, Bernard Whajah, Joseph N. Heil, Cameron L. Roman, James A. Dorman, Kerry M. Dooley

Faculty Publications

We demonstrate that for polyethylene depolymerization with induction heating (IH), using a bifunctional (Pt- or Pt− Sn-containing zeolite) hydrocracking catalyst, we can obtain high hydrocarbon product yields (up to 95 wt % in 2 h) at a relatively low surface temperature (375 °C) and with a tunable product distribution ranging from light gas products to gasoline- to diesel-range hydrocarbons. Four zeolite types [MFI, LTL, CHA(SSZ-13), and TON] were chosen as the supports due to their varying pore sizes and structures. These depolymerization results are obtained at atmospheric pressure and without the use of H2 and result in an alkane/alkene mixture …