Digital Commons Network^™

Effect Of Surfactant, Oil:Water Ratio And Temperature On The Rheology Of Emulsion-Suspension Complex Fluids: Implications For Oil-Based Drilling Fluids, Gilles Landry Numkam

LSU Doctoral Dissertations

Drilling fluids are non-Newtonian mixtures that play a critical role in the timely and successful completion of oil and gas wells. In the particular case of offshore operations, proper design of drilling fluids is of paramount importance in the constant quest to lower break-even prices. Most downhole problems are directly or in-directly related to the rheological and physical properties of drilling fluids, thereby calling for a better understanding of the underlying changes of these properties with respect to drilling fluid composition and external conditions.

The current stance in the design of drilling fluids involves the selection of components and their …

Preface, Hui-Hsiung Kuo, George Yin

Communications on Stochastic Analysis

No abstract provided.

Euler-Maruyama Method For Regime Switching Stochastic Differential Equations With Hölder Coefficients, Dung T. Nguyen, Son L. Nguyen

Communications on Stochastic Analysis

No abstract provided.

Eifiso4g Augments The Synthesis Of Specific Plant Proteins Involved In Normal Chloroplast Function, Andrew D. Lellis, Ryan M. Patrick, Laura K. Mayberry, Argelia Lorence, Zachary C. Campbell, Johnna L. Roose, Laurie K. Frankel, Terry M. Bricker, Hanjo A. Hellmann, Roderick W. Mayberry, Ana Solis Zavala, Grace S. Choy, Dennis C. Wylie, Mustafa Abdul-Moheeth, Adeeb Masood, Amy G. Prater, Hailey E. Van Hoorn, Nicola A. Cole, Karen S. Browning

Faculty Publications

Copyright © 2019 American Society of Plant Biologists. All rights reserved. The plant-specific translation initiation complex eIFiso4F is encoded by three genes in Arabidopsis (Arabidopsis thaliana)-genes encoding the cap binding protein eIFiso4E (eifiso4e) and two isoforms of the large subunit scaffolding protein eIFiso4G (i4g1 and i4g2). To quantitate phenotypic changes, a phenomics platform was used to grow wild-type and mutant plants (i4g1, i4g2, i4e, i4g1 × i4g2, and i4g1 × i4g2 × i4e [i4f]) under various light conditions. Mutants lacking both eIFiso4G isoforms showed the most obvious phenotypic differences from the wild type. Two-dimensional differential gel electrophoresis and mass spectrometry …

Louisiana-Recognized Native American Tribal Needs Assessment: Understanding The Perceptions, Resources, And Challenges Involving Opioid Use Disorder, Judith L. Rhodes, Kandra Colomb, Jada Thomas-Smith

Reports

Executive Summary The Social Research and Evaluation Center (SREC) at the Louisiana State University, College of Human Sciences and Education engaged Louisiana-recognized tribes to investigate their perceptions, resources, and challenges around the Opioid Use Disorder (OUD) crisis in their communities. The outreach and investigative process resulted in attending tribal council meetings, conducting key stakeholder interviews, and administering tribal listening sessions. The discussions and listening sessions facilitated open dialogue about the nature of OUD, prevention, treatment, and recovery as well as identification of strengths and challenges experienced by tribal communities. Tribal citizens reported limited knowledge about help for those experiencing addiction. …

Fisetin, A 3,7,3 ',4 '-Tetrahydroxyflavone Inhibits The Pi3k/Akt/Mtor And Mapk Pathways And Ameliorates Psoriasis Pathology In 2d And 3d Organotypic Human Inflammatory Skin Models, Konstantin G. Kousoulas

Faculty Publications

Psoriasis is a chronic immune-mediated skin disease that involves the interaction of immune and skin cells, and is characterized by cytokine-driven epidermal hyperplasia, deviant differentiation, inflammation, and angiogenesis. Because the available treatments for psoriasis have significant limitations, dietary products are potential natural sources of therapeutic molecules, which can repair the molecular defects associated with psoriasis and could possibly be developed for its management. Fisetin (3,7,3 ',4 '-tetrahydroxyflavone), a phytochemical naturally found in pigmented fruits and vegetables, has demonstrated proapoptotic and antioxidant effects in several malignancies. This study utilized biochemical, cellular, pharmacological, and tissue engineering tools to characterize the effects of …

Fisetin, A 3,7,3 ',4 '-Tetrahydroxyflavone Inhibits The Pi3k/Akt/Mtor And Mapk Pathways And Ameliorates Psoriasis Pathology In 2d And 3d Organotypic Human Inflammatory Skin Models, Konstantin G. Kousoulas

Faculty Publications

Psoriasis is a chronic immune-mediated skin disease that involves the interaction of immune and skin cells, and is characterized by cytokine-driven epidermal hyperplasia, deviant differentiation, inflammation, and angiogenesis. Because the available treatments for psoriasis have significant limitations, dietary products are potential natural sources of therapeutic molecules, which can repair the molecular defects associated with psoriasis and could possibly be developed for its management. Fisetin (3,7,3 ',4 '-tetrahydroxyflavone), a phytochemical naturally found in pigmented fruits and vegetables, has demonstrated proapoptotic and antioxidant effects in several malignancies. This study utilized biochemical, cellular, pharmacological, and tissue engineering tools to characterize the effects of …

Collision With Collusion: Partisan Reaction To The Trump-Russia Scandal, Joshua P. Darr, Nathan P. Kalmoe, Kathleen Searles, Mingxiao Sui, Raymond J. Pingree, Brian K. Watson, Kirill Bryanov, Martina Santia

Faculty Publications

President Donald Trump faced substantial scandal coverage early in his presidency. Can these stories about presidential controversies change the opinions of Trump's fellow Republicans, or are the efforts of the news media to inform partisans about prominent issues futile? Past research on partisan reactions to major political scandals were confounded by problems with self-reported media use and single-shot experimental treatments. We address these concerns using a unique, repeated-exposure experimental design that either randomly supplied participants with news about the Trump-Russia scandal, or removed most of those stories from view, over the course of one week in June 2017. This design …

Welcome To The Third International Workshop On Crowd-Based Requirements Engineering (Crowdre'19), Eduard C. Groen, Meira Levy, Anas Mahmoud, Norbert Seyff

Faculty Publications

Ban'gapsuda1 and welcome to the 3rd International Workshop on Crowd-Based Requirements Engineering (CrowdRE'19), where scientists and representatives of industry with experience or an interest in CrowdRE meet to exchange ideas and contributions regarding the state of the art, and to inspire each other in ways to move forward together. The discipline of CrowdRE seeks to address challenges of traditional requirements engineering (RE) techniques by scaling up to settings with thousands to millions of users of a (software) product. These users can easily interact among themselves and with the development company, forming a large and heterogeneous group that can be denoted …

First Measurements Of The Spectral And Angular Distribution Of Transition Radiation Using A Silicon Pixel Sensor On A Timepix3 Chip, E. J. Schioppa, F. Dachs, J. Alozy, N. Belyaev, M. Campbell, M. Cherry, S. Doronin, K. Filippov, P. Fusco, F. Gargano, E. H.M. Heijne, S. Konovalov, D. Krasnopevtsev, X. Llopart, F. Loparco, V. Mascagna, M. N. Mazziotta, H. Pernegger, D. Ponomarenko, M. Prest, D. Pyatiizbyantseva, R. Radomskii, C. Rembser, A. Romaniouk, E. Shulga, S. Smirnov, Y. Smirnov, M. Soldani, P. Spinelli, D. Yu Sergeeva, A. A. Savchenko, D. Schaefer, M. Strikhanov

Faculty Publications

X-ray Transition radiation detectors (TRDs) are used for particle identification in both high energy physics and astroparticle physics. Particle identification is often achieved based on a threshold effect of the X-ray transition radiation (TR). In most of the detectors, TR emission starts at γ factors above ∼500 and reaches saturation at γ∼2−3⋅103. However, many experiments require particle identification up to γ∼105, which is difficult to achieve with current detectors, based only on the measurement of the photon energy together with the particle ionization losses. Additional information on the Lorentz factor can be extracted from the angular distribution of TR photons. …

Thylakoid Localized Bestrophin-Like Proteins Are Essential For The Co2 Concentrating Mechanism Of Chlamydomonas Reinhardtii, Ananya Mukherjee, Chun Sing Lau, Charlotte E. Walker, Ashwani K. Rai, Camille I. Prejean, Gary Yates, Thomas Emrich-Mills, Spencer G. Lemoine, David J. Vinyard, Luke C.M. Mackinder, James V. Moroney

Faculty Publications

© 2019 National Academy of Sciences. All rights reserved. The green alga Chlamydomonas reinhardtii possesses a CO2 concentrating mechanism (CCM) that helps in successful acclimation to low CO2 conditions. Current models of the CCM postulate that a series of ion transporters bring HCO3− from outside the cell to the thylakoid lumen, where the carbonic anhydrase 3 (CAH3) dehydrates accumulated HCO3− to CO2, raising the CO2 concentration for Ribulose bisphosphate carboxylase/oxygenase (Rubisco). Previously, HCO3− transporters have been identified at both the plasma membrane and the chloroplast envelope, but the transporter thought to be on the thylakoid membrane has not been identified. …

Comparison Of The Kinetic Parameters Of Escherichia Coli 0157:H7, Listeria Monocytogenes And Salmonella Typhimurium Derived From The Baranyi And Huang Models In A Chemically Defined Minimal Medium, Jose Isidro Fuentes

LSU Master's Theses

Microbial growth can be characterized by parameters such as lag time, growth rate, and maximum population density at any specific point of time. Mathematical models that predict microbial growth of foodborne pathogens are increasingly used in the food industry as a viable alternative to traditional methods of microbial enumeration. The Baranyi model has been widely used as the primary model of choice by many authors because of its performance and accuracy. The most recently developed Huang model has been less implemented and few comparisons between the Baranyi and Huang models have been made when modeling pathogenic growth. For this research, …

Antecedents Of Apparel Subscription Box Choice: Understanding Predictors To Use Apparel Subscription Service, Md Abdullahil Kafi

LSU Doctoral Dissertations

With the rise of online shopping apparel merchandising and retailing has experienced tremendous reformation. In this regard, the online apparel subscription services have become an important trend in a global retailing context. In the U.S. apparel subscription service retailers reported that the market grew by more than 100 percent from 2013 to 2018 and it continues to grow steadily.

The purpose of this study was to investigate the antecedents of online apparel subscription services, and to better understand consumers’ attitudes towards online subscription service items in the context of the extended Unified Theory of Technology Acceptance and Usage (UTAUT2). This …

Effective Use Of Information Systems For Emergency Management: A Representation Theory Perspective, Dario Bonaretti

LSU Doctoral Dissertations

Effective Use Theory (EUT) has emerged as a promising native Information Systems (IS) theory to understand a central phenomenon of interest to the discipline: the effective use of information systems. While EUT is widely accepted in operational control and management control contexts, its validity in chaotic environments has yet to be demonstrated. To contribute to the research program in EUT, scholars called for contextualizing and assessing EUT in chaotic environment, such as emergencies or crises events. This research seeks to apply EUT to understand the effective use of emergency information systems (EMIS). Seeking a grand theory of effective use in …

Retired Female Gymnasts' Reflections On Body Image And Sense Of Self, Briley Casanova

LSU Master's Theses

Researchers identify the early stages of retirement as a key developmental period when many female athletes struggle with both body image disturbances and changes to identity. Body image disturbances and changes to identity may be especially challenging for former female athletes participating in aesthetic focused sports such as gymnastics, because physical appearance plays an important role in elite performance. This study utilized semi-structured, in-depth interviews with five former NCAA Division I artistic gymnasts to learn about their experiences and perceptions of body image and athletic identity in the early stages of retirement. Three main themes emerged from the interviews: (a) …

Iron-Sulfur Cluster Assembly; In Vivo Analysis Of The Methanogenic Suf System, Evan Dunkle

LSU Master's Theses

Iron-sulfur (Fe-S) clusters are among the most ancient and prevalent of all biological cofactors. Their assembly into associated proteins is a tightly regulated process with many organisms employing multiple cluster assembly pathways. Much is known about Fe-S cluster assembly in aerobic organisms such as Escherichia coli (E. coli) but little is known in regards to cluster assembly in more ancient organisms such as methanogens. Methanogens are members of the domain of Archaea and are defined by their ability to generate methane as a byproduct of their main energy generating pathway. Methanogens also have significantly higher Fe-S cluster content …

Exceptional Points Of Any Order In A Single, Lossy Waveguide Beam Splitter By Photon-Number-Resolved Detection, Mario A. Quiroz-Juárez, Armando Perez-Leija, Konrad Tschernig, Blas M. Rodríguez-Lara, Omar S. Magaña-Loaiza, Kurt Busch, Yogesh N. Joglekar, Roberto De J. León-Montiel

Faculty Publications

Exceptional points (EPs) are degeneracies of non-Hermitian operators where, in addition to the eigenvalues, the corresponding eigenmodes become degenerate. Classical and quantum photonic systems with EPs have attracted tremendous attention due to their unusual properties, topological features, and an enhanced sensitivity that depends on the order of the EP, i.e., the number of degenerate eigenmodes. Yet, experimentally engineering higher-order EPs in classical or quantum domains remain an open challenge due to the stringent symmetry constraints that are required for the coalescence of multiple eigenmodes. Here, we analytically show that the number-resolved dynamics of a single, lossy waveguide beam splitter, excited …

Flood Protection Ecosystem Services In The Coast Of Puerto Rico: Associations Between Extreme Weather, Flood Hazard Mitigation And Gastrointestinal Illness, R. De Jesus Crespo, J. Wu, M. Myer, S. Yee, R. Fulford

Faculty Publications

No abstract provided.

Systematic Analysis On Spectral Statistics Of Odd-A Nuclei, A. Jalili Majarshin, Feng Pan, H. Sabri, Jerry P. Draayer

Faculty Publications

Level statistics for given spin and parity below 10MeV within A≤71, 71≤A≤151, and 151≤A≤221 mass regions are systematically analyzed. We have taken 5316 level spacings from 266 odd-A nuclei in the light mass region, 6897 level spacings from 478 ones in the medium mass region, and 2768 level spacings from 143 ones in the heavy mass region for the statistics. In the analysis, the chaoticity parameter in the Berry–Robnik distribution is determined based on the method of maximum likelihood estimation. The results show a mass number A-dependence in the level statistics. The larger the mass number, the relatively stronger in …

Self-Healing Concrete Using Encapsulated Bacterial Spores In A Simulated Hot Subtropical Climate, Marwa Hassan, Jose Milla, Tyson Rupnow, Ahsennur Soysal

Publications

Bacterial concrete has become one of the most promising self-healing alternatives due to its capability to seal crack widths through microbial induced calcite precipitation (MICP). In this study, two bacterial strains were embedded at varying dosages (by weight of cement) in concrete. Beam specimens were used to identify the maximum crack-sealing efficiency, while cylinder samples were used to determine their effects on the intrinsic mechanical properties, as well as its stiffness recovery over time after inducing damage. The concrete specimens were cured in wet-dry cycles to determine their feasibility in Region 6. The results showed that the specimen groups with …

Development Of Metals Corrosion Maps Of Arkansas And Maintenance Of Cross-Drains, Zahid Hossain, Ashraf Elsayed, Mdariful Hasan

Publications

Corrosion potential of metallic structures in alluvial soils is governed by chemical and electromagnetic properties of the soils. Geotechnical engineers are generally more concerned about different types of soils and their physical and mechanical properties than the chemical aspects. The main objective of this study is to analyze the geotechnical, electrochemical and electromagnetic properties of soils in Arkansas. Important parameters (e.g., soil resistivity) related to corrosion potential of metal culverts have been predicted through neural network (NN) models. The developed NN models have been trained and verified by using laboratory test results of soil samples collected from Arkansas Department of …

Portable Roadway High Water Detection System For Driver Safety And Infrastructure Assessment, Hatim Sharif, Samer Dessouky

Publications

The state of Texas, local governments, and community groups are adopting several initiatives to address this problem. The main goal of this project is to develop an approach to enhance prediction and detection of roadway flooding and help efforts to prevent driving into flood roadways. The motivation of this work was initiated by the alarming number of vehicle related flood fatalities in Texas, mostly at low-water crossings. Texas leads the nation in the number of flood fatalities and about 77% of flood fatalities in Texas are motor vehicle-related. This percentage is much higher than the national percentage reported in several …

Extendibility Of Bosonic Gaussian States, Ludovico Lami, Sumeet Khatri, Gerardo Adesso, Mark M. Wilde

Faculty Publications

Extendibility of bosonic Gaussian states is a key issue in continuous-variable quantum information. We show that a bosonic Gaussian state is k-extendible if and only if it has a Gaussian k-extension, and we derive a simple semidefinite program, whose size scales linearly with the number of local modes, to efficiently decide k-extendibility of any given bosonic Gaussian state. When the system to be extended comprises one mode only, we provide a closed-form solution. Implications of these results for the steerability of quantum states and for the extendibility of bosonic Gaussian channels are discussed. We then derive upper bounds on the …

Incarcerated Workers And Inmate All-Hazard Firefighters In Emergency Response And Disasters: A Captive Labor Force, Jordan Carlee Smith

LSU Doctoral Dissertations

As disasters continue to increase both in frequency and in capacity for damage, the impacts of such events on incarcerated populations in the U.S. is becoming more apparent. The dependence of various states on the labor of prisoners to respond to major disasters such as hurricanes, floods, earthquakes, oil spills, and wildfires has become a focal point of discussions centering on mass incarceration, the rights of prisoners, and the future of criminal justice reform. The institutions and structures which make incarcerated workers vulnerable to disasters within the prison setting, also make them vulnerable as workers. They face life altering repercussions …

Single-World Consistent Interpretation Of Quantum Mechanics From Fundamental Time And Length Uncertainties, Rodolfo Gambini, Luis Pedro García-Pintos, Jorge Pullin

Faculty Publications

The production of events in quantum theory, that is, of outcomes to which a probability can be associated, is inconsistent with a unitary evolution for systems in arbitrary initial states. In particular, within unitary quantum mechanics, there exist global protocols that allow verifying that no definite event occurs. Instead, states that start in a coherent superposition over possible outcomes always remain as a superposition. We show that when taking into account fundamental errors in measuring length and time intervals, which have been put forward as a consequence of a conjunction of quantum mechanical and general relativity arguments, there are instances …

The Cost Of Helping Traumatized Students: Compassion Fatigue In Student Affairs Professionals, Craig A. Marcus

LSU Doctoral Dissertations

A large body of literature has explored the impact of compassion fatigue on individuals who work within various helping professions. Few studies, however, have sought to understand its impact on educators, more specifically student affairs professionals. As the number of students attending college with diagnosed mental health issues, and scrutinized attention is given to traumatic and crisis events that occur on campuses, student affairs professionals are often the first ones who respond and interact with the affected students. Student affairs professionals spend countless hours connecting impacted students to available resources as well as serving as a resource regardless of the …

Entomology In The 21st Century: Tackling Insect Invasions, Promoting Advancements In Technology, And Using Effective Science Communication - 2018 Student Debates, Casey Parker, Lina Bernaola, Benjamin W. Lee, Dane Elmquist, Abigail Cohen, Adrian Marshall, James Hepler, Adrian Pekarcik, Emily Justus, Kendall King, Tae Young Lee, Carlos Esquivel, Kayleigh Hauri, Christopher Mccullough, Whitney Hadden, Max Ragozzino, Morgan Roth, James Villegas, Emily Kraus, Michael Becker, Megan Mulcahy, Rui Chen, Priyanka Mittapelly, C. Scott Clem, Rachel Skinner, Tanya Josek, Daniel Pearlstein, Jonathan Tetlie, Anh Tran, Anthony Auletta, Edwin Benkert, Dylan Tussey

Faculty Publications

The 2018 student debates of the Entomological Society of America were held at the Joint Annual Meeting for the Entomological Societies of America, Canada, and British Columbia in Vancouver, BC. Three unbiased introductory speakers and six debate teams discussed and debated topics under the theme aEntomology in the 21st Century: Tackling Insect Invasions, Promoting Advancements in Technology, and Using Effective Science Communication'. This year's debate topics included: 1) What is the most harmful invasive insect species in the world? 2) How can scientists diffuse the stigma or scare factor surrounding issues that become controversial such as genetically modified organisms, agricultural …

Simulations Of Strong-Field Ionization In Molecules Using Tuned Range-Separated Time-Dependent Density Functional Theory, Adonay Sissay

LSU Doctoral Dissertations

Strong-field ionization and the resulting electronic dynamics are important for a range of processes such as high harmonic generation, photodamage, charge resonance enhanced ionization, and ionization-triggered charge migration. Modeling ionization dynamics in molecular systems from first-principles can be challenging due the large spatial extent of the wavefunction which stresses the accuracy of basis sets, and the intense fields which require non-perturbative time-dependent electronic structure methods. In this dissertation, we develop a time dependent density functional theory approach which uses a Gaussian-type orbital (GTO) basis set to capture strong-field ionization rates and dynamics in atoms and small molecules. This involves propagating …

Characterization Of Bunyamwera, Batai, And Ngari Viruses: Unrecognized Arboviruses Of One Health Importance In Rwanda, Marie Fausta Dutuze

LSU Doctoral Dissertations

Bunyamwera (BUNV), Batai (BATV), and Ngari (NRIV) are mosquito-borne viruses (Genus: Orthobunyavirus, Family: Peribunyaviridae, Order: Bunyavirales). They have an RNA tripartite genome consisting of small (S), medium (M), and large (L) segments. NRIV is a natural reassortant of BUNV and BATV, with the genome: S_BUNV, M_BATV, L_BUNV. All three viruses have been associated with disease of varying severity in domestic ruminants and humans. In livestock, infection with these viruses is associated with abortions, while humans may present a mild febrile illness or severe disease such as hemorrhagic fever or meningoencephalitis. In East Africa, …

Examining The Evolution Of Urban Multipurpose Facilities: Applying The Ideal-Type To The Facilities Of The National Hockey League And National Basketball Association, Benjamin Downs

LSU Doctoral Dissertations

The standardized versions of ice hockey and basketball emerged during the last quarter of the 19^thcentury. In short order both ice hockey and basketball evolved from amateur, recreational activities to professional sport and entertainment businesses. This study analyzes, contextualizes, and discusses the layout of the urban multipurpose facilities that emerged to house both professional hockey and professional basketball, with particular attention paid to the facilities of the National Hockey League and National Basketball Association. The study uses the lens of modernization and the ideal-type heuristic device to extend Bale’s and Seifried’s facility evolution models. In addition to providing …