Digital Commons Network^™

Auditory Distraction Does More Than Disrupt Rehearsal Processes In Children’S Serial Recall, Angela M. Aubuchon, Corey I. Mcgill, Emily M. Elliott

Faculty Publications

As children mature, their ability to remember information improves. This improvement has been linked to changes in verbal control processes such as rehearsal. Rehearsal processes are thought to undergo a quantitative shift around 7 years of age; however, direct measurement of rehearsal is difficult. We investigated a measure of rehearsal ability in children and compared this measurement to serial recall performance in the presence of auditory distractors. Theories of auditory distraction effects in children rely upon a combination of attentionally based and serial-order-based processes (Elliott et al. in Journal of Memory and Language, 88, 39–50, 2016); the present work contributes …

Essays On The Chinese Economy, Fan Duan

LSU Doctoral Dissertations

This dissertation includes three essays which contribute to the literature on economic growth, innovation, and international trade in China. Chapter 2 examines the implication of early economic prosperity, measured by the city-level population density in 1776, for modern day China. It shows that uneven economic performance across cities in the modern-day China can be traced to variation in living standards in 1776. Chapter 3 investigates the effects of innovation and human capital on firms’ export decisions over the 2003-2011 period, and it shows that more innovative and skill-intensive firms are more likely to export and stay in the export market. …

Probing The Interplay Between Geometric And Electronic-Structure Features Via High-Harmonic Spectroscopy, T. T. Gorman, T. D. Scarborough, P. M. Abanador, F. Mauger, D. Kiesewetter, P. Sándor, S. Khatri, K. Lopata, K. J. Schafer, P. Agostini, M. B. Gaarde, L. F. Dimauro

Faculty Publications

© 2019 Author(s). We present molecular-frame measurements of the recombination dipole matrix element (RDME) in CO2, N2O, and carbonyl sulfide (OCS) molecules using high-harmonic spectroscopy. Both the amplitudes and phases of the RDMEs exhibit clear imprints of a two-center interference minimum, which moves in energy with the molecular alignment angle relative to the laser polarization. We find that whereas the angle dependence of this minimum is consistent with the molecular geometry in CO2 and N2O, it behaves very differently in OCS; in particular, the phase shift which accompanies the two-center minimum changes sign for different alignment angles. Our results suggest …

Structure-Property Relationship In Layered Bamn2sb2 And Ba2 Mn3sb2o2, Qiang Zhang, Zhenyu Diao, Huibo Cao, Ahmad Saleheen, Ramakanta Chapai, Dongliang Gong, Shane Stadler, R. Jin

Faculty Publications

Layered transition-metal compounds have received great attention owing to their physical properties. Here, we present the structural, electronic, thermal, and magnetic properties of BaMn2Sb2 and Ba2Mn3Sb2O2 single crystals, both with the layered structure analogous to high-temperature Cu- A nd Fe-based superconductors. While the Mn moment in the MnSb4 tetrahedral environment forms a long-range G-type antiferromagnetic (AFM) ordering in both BaMn2Sb2 (TN1≈443K) and Ba2Mn3Sb2O2 (TN1≈314K), a short-range AFM order is found in the intercalated MnO2 layer at a much lower temperature (TN2≈60K) coexisting with long-range G-type order in MnSb4 layer in Ba2Mn3Sb2O2. The directions of the ordered moments in these two …

Probing The Interplay Between Geometric And Electronic-Structure Features Via High-Harmonic Spectroscopy, T. T. Gorman, T. D. Scarborough, P. M. Abanador, F. Mauger, D. Kiesewetter, P. Sándor, S. Khatri, K. Lopata, K. J. Schafer, P. Agostini, M. B. Gaarde, L. F. Dimauro

Faculty Publications

We present molecular-frame measurements of the recombination dipole matrix element (RDME) in CO2, N2O, and carbonyl sulfide (OCS) molecules using high-harmonic spectroscopy. Both the amplitudes and phases of the RDMEs exhibit clear imprints of a two-center interference minimum, which moves in energy with the molecular alignment angle relative to the laser polarization. We find that whereas the angle dependence of this minimum is consistent with the molecular geometry in CO2 and N2O, it behaves very differently in OCS; in particular, the phase shift which accompanies the two-center minimum changes sign for different alignment angles. Our results suggest that two interfering …

Floodwater Impact On Galveston Bay Phytoplankton Taxonomy, Pigment Composition And Photo-Physiological State Following Hurricane Harvey From Field And Ocean Color (Sentinel-3a Olci) Observations, Eurico D'Sa

Faculty Publications

Phytoplankton taxonomy, pigment composition and photo-physiological state were studied in Galveston Bay (GB), Texas (USA), following the extreme flooding associated with Hurricane Harvey (25-29 August 2017) using field and satellite ocean color observations. The percentage of chlorophyll a (Chl a) in different phytoplankton groups was determined from a semi-analytical IOP (inherent optical property) inversion algorithm. The IOP inversion algorithm revealed the dominance of freshwater species (diatom, cyanobacteria and green algae) in the bay following the hurricane passage (29 September 2017) under low salinity conditions associated with the discharge of floodwaters into GB. Two months after the hurricane (29-30 October 2017), …

Physiological Characterization Of Inward Rectifier Potassium (Kir) Channels In Insect Neural Systems, Rui Chen

LSU Master's Theses

A complete understanding of the physiological pathways critical for proper function of the insect nervous system is still lacking. The recent development of potent and selective small-molecule modulators of insect inward rectifier potassium channels has enabled the interrogation of the physiological role and toxicological potential of Kir channels within various insect tissue systems. Therefore, we aimed to highlight the physiological and functional role of neural Kir channels in the central nervous system, muscular system, and neuromuscular system through pharmacological and genetic manipulations. Our data provide significant evidence that Drosophila neural systems rely on the inward conductance of K+ ions for …

Hsv-1 Live-Attenuated Vaccine Strain Vc2 Confers Complete Protection In Mice Against Ocular Immunipathogenesis By The Human Clinical Strain Hsv-1 (Mckrae), Shan Krishnan Naidu

LSU Doctoral Dissertations

Herpes simplex virus type-1 (HSV-1) can cause severe ocular infection and blindness. We have previously shown that the HSV-1 VC2 vaccine strain is protective in mice and guinea pigs against genital herpes infection following vaginal challenge with HSV-1 or HSV-2. In this study, we evaluated the efficacy of VC2 intramuscular vaccination in mice against herpetic keratitis following ocular challenge with the lethal human clinical strain HSV-1(McKrae). VC2 vaccination in mice produced superior protection and morbidity control in comparison to its parental strain HSV-1(F). Specifically, after HSV-1(McKrae) ocular challenge, all VC2- vaccinated mice survived, while 30% of the HSV-1(F)- vaccinated and …

An Introduction To Hpxmp – A Modern Openmp Implementation Leveraging Hpx, An Asynchronous Many-Task System, Tianyi Zhang, R. Tohid, Shahrzad Shirzad, Weile Wei, Patrick Diehl, Hartmut Kaiser

Faculty Publications

Asynchronous Many-task (AMT) runtime systems have gained increasing acceptance in the HPC community due to the performance improvements offered by fine-grained tasking runtime systems. At the same time, C++ standardization efforts are focused on creating higher-level interfaces able to replace OpenMP or OpenACC in modern C++ codes. These higher level functions have been adopted in standards conforming runtime systems such as HPX, giving users the ability to simply utilize fork-join parallelism in their own codes. Despite innovations in runtime systems and standardization efforts users face enormous challenges porting legacy applications. Not only must users port their own codes, but often …

An Examination Of The Technical Adequacy, Classification Accuracy, And Usability Of The Ssis Sel Screening/Process Monitoring Scales In Elementary School Populations, Shelby Mccoy Byrd .

LSU Doctoral Dissertations

Social emotional skills and competencies are integral to student success at home, school, and in the larger community. Extant research also consistently demonstrates that social emotional skill deficits are associated with various adverse outcomes. Universal screening for social emotional and behavioral risk in schools facilitates early identification and targeted intervention, with the primary goal to mitigate and reduce these potential adverse outcomes for students. Research on the technical adequacy and classification accuracy of universal screening is essential to this process to ensure efficient and accurate identification, as well as subsequent implementation of social emotional interventions targeting deficits in skills.The purpose …

Antimicrobial Properties Of Different Chitosans Against Gram-Negative And Gram-Positive Foodborne Pathogens In Food Products, Nancy Katherine Rubio Zapata

LSU Doctoral Dissertations

Chitosan is a polymer derived of the deacetylation of chitin that is one of the most abundant material in nature. Chitosan solutions applied as edible coatings, and dipping solutions have shown positive results in the extension of shelf life on seafood and meat products. The purpose of this study was to evaluate the antimicrobial activities of a newly invented high molecular weight water-soluble (HMWWS) chitosan against selected Gram-negative (Salmonella Typhimurium, Vibrio parahaemolyticus, Vibrio vulnificus, and Vibrio cholerae) and Gram-positive (Listeria monocytogenes, Staphylococcus aureus, and Bacillus cereus) foodborne pathogens (initial inoculation of 6.5 Log). Chitosans with …

Optimal And Efficient Decision-Making For Power System Expansion Planning, Mahdi Mehrtash

LSU Doctoral Dissertations

A typical power system consists of three major sectors: generation, transmission, and distribution. Due to ever increasing electricity consumption and aging of the existing components, generation, transmission, and distribution systems and equipment must be analyzed frequently and if needed be replaced and/or expanded timely. By definition, the process of power system expansion planning aims to decide on new as well as upgrading existing system components in order to adequately satisfy the load for a foreseen future.

In this dissertation, multiple economically optimal and computationally efficient methods are proposed for expanding power generation, transmission, and distribution systems. First, a computationally efficient …

Application Of X-Ray Grating Interferometry To Polymer/Flame Retardant Blends In Additive Manufacturing, Omoefe Joy Kio

LSU Doctoral Dissertations

X-ray grating interferometry is a nondestructive tool for visualizing the internal structures of samples. Image contrast can be generated from the absorption of X-rays, the change in phase of the beam and small-angle X-ray scattering (dark-field). The attenuation and differential phase data obtained complement each other to give the internal composition of a material and large-scale structural information. The dark-field signal reveals sub-pixel structural detail usually invisible to the attenuation and phase probe, with the potential to highlight size distribution detail in a fashion faster than conventional small-angle scattering techniques. This work applies X-ray grating interferometry to the study of …

A Model-Based Framework For The Smart Manufacturing Of Polymers, Santiago D. Salas Ortiz

LSU Doctoral Dissertations

It is hard to point a daily activity in which polymeric materials or plastics are not involved. The synthesis of polymers occurs by reacting small molecules together to form, under certain conditions, long molecules. In polymer synthesis, it is mandatory to assure uniformity between batches, high-quality of end-products, efficiency, minimum environmental impact, and safety. It remains as a major challenge the establishment of operational conditions capable of achieving all objectives together. In this dissertation, different model-centric strategies are combined, assessed, and tested for two polymerization systems.

The first system is the synthesis of polyacrylamide in aqueous solution using potassium persulfate …

Direct Measurement Of The Cosmic-Ray Proton Spectrum From 50 Gev To 10 Tev With The Calorimetric Electron Telescope On The International Space Station, O. Adriani, Y. Akaike, K. Asano, Y. Asaoka, M. G. Bagliesi, E. Berti, G. Bigongiari, W. R. Binns, S. Bonechi, M. Bongi, P. Brogi, A. Bruno, J. H. Buckley, N. Cannady, G. Castellini, C. Checchia, M. L. Cherry, G. Collazuol, V. Di Felice, K. Ebisawa, H. Fuke, T. G. Guzik, T. Hams, N. Hasebe, K. Hibino, M. Ichimura, K. Ioka, W. Ishizaki, M. H. Israel, K. Kasahara, J. Kataoka, R. Kataoka, Y. Katayose

Faculty Publications

In this paper, we present the analysis and results of a direct measurement of the cosmic-ray proton spectrum with the CALET instrument onboard the International Space Station, including the detailed assessment of systematic uncertainties. The observation period used in this analysis is from October 13, 2015 to August 31, 2018 (1054 days). We have achieved the very wide energy range necessary to carry out measurements of the spectrum from 50 GeV to 10 TeV covering, for the first time in space, with a single instrument the whole energy interval previously investigated in most cases in separate subranges by magnetic spectrometers …

Morphological And Physiological Characteristics Of Endornavirus-Infected And Endornavirus-Free Near-Isogenic Lines Of Bell Pepper (Capsicum Annuum), C. Escalante, R. A. Valverde

Faculty Publications

Plant endornaviruses are persistent viruses that infect plants without causing symptoms. Although endornaviruses have been reported in many economically important plant species, little is known about the effect they have on their hosts. Bell pepper endornavirus (BPEV) has been reported in cultivated peppers (Capsicum spp.). In commercial cultivars of bell pepper (C. annuum) grown in the United States, this virus is found at prevalence rates of 100%. Two bell pepper near-isogenic lines (NILs), one BPEV-infected and the other BPEV-free, were generated and used to investigate the type of symbiotic relationship between BPEV and bell pepper. Selected morphological and physiological characteristics …

Gray Radiation Hydrodynamics With The Flash Code For Astrophysical Applications, E. Chatzopoulos, K. Weide

Faculty Publications

We present the newly incorporated gray radiation hydrodynamics capabilities of the FLASH code based on a radiation flux-limiter-aware hydrodynamics numerical implementation designed specifically for applications in astrophysical problems. The implemented numerical methods consist of changes in the unsplit hydrodynamics solver and adjustments in the flux-limited radiation diffusion unit. Our approach can handle problems in both the strong and weak radiation-matter coupling limits, as well as transitions between the two regimes. Appropriate extensions in the "Helmholtz" equation of state are implemented to treat two-temperature astrophysical plasmas involving the interaction between radiation and matter and the addition of a new opacity unit …

The Mechanism Of Directed Forgetting In Visual Working Memory, Katherine Camille Moen

LSU Doctoral Dissertations

The goal of the current study was to determine if forgetting in visual working memory (VWM) depends on the strength of the memory representations, and to examine different potential mechanisms of directed forgetting in VWM. The strength of memory representations varies depending on factors during encoding and maintenance, which may impact the likelihood of successful forgetting. Experiment 1 manipulated encoding time and cue onset, and utilized eye tracking in order to determine the extent of directed forgetting in VWM. Results support evidence for partial forgetting, and revealed that the strength of memory representations does not impact the likelihood of successful …

Molecularly Heterogeneous Structure Of A Nonionic Deep Eutectic Solvent Composed Of N-Methylacetamide And Lauric Acid, Yaowen Cui, Jeramie C. Rushing, Soenke Seifert, Nicholas M. Bedford, Daniel G. Kuroda

Faculty Publications

© 2019 American Chemical Society. Deep eutectic solvents (DES) are a new class of designer solvents with a wide range of possible applications. DESs are typically made from an ionic compound and a hydrogen bond donor, but lately DESs made of nonionic compounds with interesting properties have started to appear. This study focuses on describing the structure, dynamics, and interactions of a nonionic DES composed of N-methylacetamide (NMA) and lauric acid (LA). Linear IR and time-resolved IR experiments show that LA-NMA DES is the result of hydrogen bond interaction between the two molecular components, though the interaction energy is only …

Measurement Of D+ Be 7 Cross Sections For Big-Bang Nucleosynthesis, N. Rijal, I. Wiedenhöver, J. C. Blackmon, M. Anastasiou, L. T. Baby, D. D. Caussyn, P. Höflich, K. W. Kemper, E. Koshchiy, G. V. Rogachev

Faculty Publications

The cross sections of nuclear reactions between the radioisotope Be7 and deuterium, a possible mechanism of reducing the production of mass-7 nuclides in big-bang nucleosynthesis, were measured at center-of-mass energies between 0.2 and 1.5 MeV. The measured cross sections are dominated by the (d,α) reaction channel, towards which prior experiments were mostly insensitive. A new resonance at 0.36(5) MeV with a strength of ωγ=1.7(5) keV was observed inside the relevant Gamow window. Calculations of nucleosynthesis outcomes based on the experimental cross section show that the resonance reduces the predicted abundance of primordial Li7, but not sufficiently to solve the primordial …

Process Dimensions Of Intervention Implementation: Evaluating The Quality Of Professional Development Delivered To Teachers, Sarah Petters Fletcher

LSU Doctoral Dissertations

It is well-established that having a high-quality teacher can lead to long-lasting, significant effects on students’ achievement. We know that teacher effectiveness reliably has an impact on student outcomes, but what impacts teacher effectiveness? One regularly recommended and prominent method for improving teacher effectiveness is through coaching. However, to date, the active components of coaching interventions have yet to be adequately specified, measured and investigated. The primary aim of the proposed study is to address this gap in the teacher coaching literature by examining which aspects of a coaching intervention, Making the Most of Classroom Interactions (MMCI), may lead to …

Improving The Food Safety Of Louisiana Strawberry Industry, Jose L. Brandao Delgado

LSU Doctoral Dissertations

Escherichia coli O157:H7, Salmonella sp., and Listeria monocytogenes have been linked to foodborne outbreaks in produce. The most recent outbreaks in produce have been associated with irrigation water due to infiltration of well water or water run-off from contaminated sources. The Food Safety Modernization Act (FSMA) requires all irrigation water to be safe for use on produce, as a strategy to reduce foodborne illnesses. A surfactant modified zeolite (SMZ) filtration system could provide produce farmers with a sustainable low-cost system for high-quality and safe irrigation water. The objective of this study was to evaluate the effectiveness of hexadecyltrimethylammonium …

Architecture For Configuration Of A Reconfigurable Integrated Circuit, Ramachandran Vaidyanathan, Arash Ashrafi

College of Engineering Patents

A system and method includes generating, with a configuration controller, a configuration bitstream including configuration bits to dynamically define the configuration of a reconfigurable integrated circuit by setting a state of a subset of configuration state memory units. The configuration controller accesses individual configuration state memory units of the subset according to a scan path through the configuration state memory units traversed according to a delay factor based, at least in part, on clock frequency of a clock signal produced by a configuration clock and configures the individual configuration state memory units with corresponding configuration bits of the configuration bitstream.

Microscopic View On Structure And Dynamics In Polymer Nanocomposites, Stefan Otto Huber

LSU Doctoral Dissertations

The focus of this thesis is on the single chain conformation and dynamics in polymer melts, nanocomposite melts and networks. The exploration of structure, morphology and dynamics has shown to be crucial to understand the basic science in such systems, like the influence of entropy, confinement, and monomeric friction. These parameters can be translated into the macroscopic behavior of the materials. The scientific work on model nanocomposite systems contributes to accelerate the development of materials, and also to invent to date unknown materials with uprecedented properties, needed for car tires, low weight but ultra strong materials or batteries. This thesis …

Authentic Csr In Professional Sport Organizations: Application Of A Theoretical Framework, Yoseph Mamo

LSU Doctoral Dissertations

Within the present dissertation, determinants for authentic CSR, process and outcomes are explored. A three-paper multiple method examination has been conducted, including a conceptual paper framework (Chapter 2), a structural equation model (Chapter 3), and MANOVA analysis (Chapter 4). Chapter 2 extends literature on when, why, and how professional sport organizations (PSO) can develop authentic CSR activities that can have a long-term positive impact on stakeholders. Chapter 3 advances literature on identifying the relevant dimensions of CSR that are supported by the fans rather than using a more holistic approach will advance our understanding of the relationships between different types …

Isospin Symmetry In B(E2) Values: Coulomb Excitation Study Of Mg 21, P. Ruotsalainen, J. Henderson, G. Hackman, G. H. Sargsyan, K. D. Launey, A. Saxena, P. C. Srivastava, S. R. Stroberg, T. Grahn, J. Pakarinen, G. C. Ball, R. Julin, P. T. Greenlees, J. Smallcombe, C. Andreoiu, N. Bernier, M. Bowry, M. Buckner, R. Caballero-Folch, A. Chester, S. Cruz, L. J. Evitts, R. Frederick, A. B. Garnsworthy, M. Holl, A. Kurkjian, D. Kisliuk, K. G. Leach, E. Mcgee, J. Measures, D. Mücher, J. Park, F. Sarazin

Faculty Publications

The Tz=-32 nucleus Mg21 has been studied by Coulomb excitation on Pt196 and Pd110 targets. A 205.6(1)-keV γ-ray transition resulting from the Coulomb excitation of the 52+ ground state to the first excited 12+ state in Mg21 was observed for the first time. Coulomb excitation cross-section measurements with both targets and a measurement of the half-life of the 12+ state yield an adopted value of B(E2;52+→12+)=13.3(4) W.u. A new excited state at 1672(1) keV with tentative 92+ assignment was also identified in Mg21. This work demonstrates a large difference in the B(E2;52+→12+) value between T=32, A=21 mirror nuclei. The difference …

Global-Mindedness In National Geographic Certified Educators, Amy Pan

LSU Doctoral Dissertations

ABSTRACT

The purpose of this mixed methods study is to investigate the global-mindedness among National Geographic Certified Educators. The triangulation of data includes quantitative data, which is the Global-Mindedness Scale (Hett, 1993), and qualitative data, which is the questionnaire, and sample lesson plans. The survey results were based on 485 participants, with 286 National Geographic Certified Educators and 199 non-National Geographic Certified Educators. The survey was conducted through Qualtrics© with privacy protection and the Statistical Package of Social Science (SPSS) was used for a two-tailed independent sample t-test and Repeated Measures ANOVA to analyze the data. Google Forms was …

Analytical And Numerical Modeling Of Cavity Expansion In Anisotropic Poroelastoplastic Soil, Kai Liu

LSU Doctoral Dissertations

Cavity expansion/contraction problems have attracted intensive attentions over the past several decades due to its versatile applications, such as the interpretation of pressuremeter/piezocone penetration testing results and the modelling of pile installation/tunnel excavation in civil engineering, and the prediction of critical mud pressure required to maintain the wellbore stability in petroleum engineering. Despite the fact that various types of constitutive models have been covered in the literature on this subject, the soils and/or rocks were usually treated as isotropic geomaterials.

In recognition of the above fact, this research makes a substantial extension of the fundamental cavity expansion theory by considering …

Internal Versus External Predictors Of Physical Activity In Youth, Paige Marie Ryan

LSU Doctoral Dissertations

Physical activity (PA) participation has been linked to broad health benefits including reduced risk of chronic diseases (Centers for Disease Control [CDC], 2008). PA participation is important for youth as it sets the precedent for continued engagement and improved long-term health. Nonetheless, adolescents have some of the lowest rates of physical activity, and subsequently obesity rates in youth have exponentially increased in the past few decades (CDC, 2013). Therefore, determining predictors of PA for adolescents is of vital importance. Many studies focus on barriers to PA in youth, but few include both facilitating and inhibiting factors of youth PA participation. …

Refuse: Excess And Resistance In Gilded Age Print And Literature, Leah Michelle Powell

LSU Doctoral Dissertations

In the late-nineteenth century, mechanization led to fears about the possible consequences of overproduction while immigration led to fears about the possible consequences of overpopulation. This dissertation examines Gilded Age texts that represent regionalized spaces in efforts to process interlinked anxieties about a surplus of people and a surplus of things. I argue that images of excess and cheapness were rhetorically powerful in efforts to both control and advocate for unassimilated and nonstandard people and places in a nation increasingly dominated by an urban commodity economy. This focus on excess often takes the form of verbal or visual imagery, but …