Digital Commons Network^™

Origin Of Localization In Ti-Doped Si, Yi Zhang, R. Nelson, K. M. Tam, W. Ku, U. Yu, N. S. Vidhyadhiraja, H. Terletska, J. Moreno, M. Jarrell, T. Berlijn

Faculty Publications

Intermediate band semiconductors hold the promise to significantly improve the efficiency of solar cells but only if the intermediate impurity band is metallic. We apply a recently developed first principles method to investigate the origin of electron localization in Ti doped Si, a promising candidate for intermediate band solar cells. We compute the critical Ti concentration and compare it against the available experimental data. Although Anderson localization is often overlooked in the context of intermediate band solar cells, our results show that in Ti doped Si it plays a more important role in the metal insulator transition than Mott localization. …

I Am Complicated, And So Is My Blackness: A Trifecta Exploration Of Educational Spaces And Identity Development, Kala Burrell-Craft

LSU Doctoral Dissertations

Myriads of research studies have been written over the past 20 years highlighting the racial gap and disparities in educational opportunities and outcomes between Black and White students, but as revealed in a review of the literature, more studies need to be conducted that examine the intersection of race, space/place, and racial identity development. Using critical race theory as a framework, this study comprised of three separate, but related essays that explore the function of educational spaces in which Black Americans navigate, grow, and develop as it intersects with race, space/place, and identity development. Essay one is a critical narrative …

Creating Coping Mechanism: An Anatomy Of A Gallery-Based Installation And Performance Work, Jamie M. Kutner

LSU Master's Theses

The project described in this paper is an exhibition of gallery-based durational performance art, and resulting three-dimensional artifacts, that was created through a tangled process of relapse and recovery from mental illness. The first section of this paper peers into the parameters of ephemeral artistic practice. I discuss the process of merging my recovery and creative practice through performance art, and then parse the discussion of the work into the categories of performer, audience, site, and time. Section II details various aspects of spectator experience through a second-person narrative tracing the crowd flow of the exhibition. I conclude with an …

The Evolution Of A Collaborative Network: Understanding Partnerships In A Policy Mandated Collaboration Through Social Network Analysis, Pallavi Singh

LSU Doctoral Dissertations

Federal funding agencies that administer financial support in the form of program grants to non-profit organizations (NPOs) that provide child and family services increasingly require NPOs to formalize inter-organizational partnerships in order to receive this vital source of funding. That is, by mandate NPOs must participate in inter-organizational collaboration networks to receive these essential federal funds. Therefore, there is a need to understand the collaboration behavior of NPOs in a policy-mandated environment. This study considers collaboration behavior as information sharing and advice-seeking between the organizations who are part of a collaboration network as a result of a policy mandate.

Drawing …

Identifying Structural Changes With Unsupervised Machine Learning Methods, Nicholas Walker, Ka Ming Tam, Brian Novak, M. Jarrell

Faculty Publications

Unsupervised machine learning methods are used to identify structural changes using the melting point transition in classical molecular dynamics simulations as an example application of the approach. Dimensionality reduction and clustering methods are applied to instantaneous radial distributions of atomic configurations from classical molecular dynamics simulations of metallic systems over a large temperature range. Principal component analysis is used to dramatically reduce the dimensionality of the feature space across the samples using an orthogonal linear transformation that preserves the statistical variance of the data under the condition that the new feature space is linearly independent. From there, k-means clustering is …

High Energy Grating Techniques, Leslie G. Butler, Kyungmin Ham, Warren W. Johnson

College of Science Patents

Imaging techniques that may be used in applications such as differential phase contrast imaging are disclosed that include, for example, configuring a beam source and a beam detector such that a beam connects the two, positioning an object, a phase grating and an analyzer grating in the beam path, producing multiple data sets based on various analyzer grating positions, and conducting a regression analysis using a predetermined function having a set of fitting coefficients to establish those fitting coefficients. In those techniques, the fitting coefficients may be used to characterize a set of interference properties associated with the object.

A Systematic Investigation Of Condensation Heat Transfer Using Asymmetric Micro-Scale Surfaces, Emily Brown

LSU Master's Theses

Asymmetric surfaces been shown to inducing unidirectional motion in the Leidenfrost regime; however, very minimal research has been conducted to investigate whether these surface can enhance condensation through the same means. The investigation of heat transfer of ratchets in condensation is a relatively untapped area of study, specifically ratchets with superhydrophobic properties. Anticipated difficulty lies in creating surfaces features or coatings that retain the ratchets and can adequately sustain optimal wetting state of Cassie-Baxter required to improve heat transfer performance during condensation. This study serves to investigate whether ratchets are a feasible surface feature to enhance condensation heat transfer. First, …

Transforming Lives In Coastal Communities Through Economic Development: Breeding Crassostrea Virginica For Alternative Oyster Culture, Brian Randall Callam

LSU Doctoral Dissertations

This dissertation helped address the commercialization of triploid Crassostrea virginica production and develop tetraploid C. virginica broodstock in Louisiana by addressing triploid commercialization and tetraploid broodstock development. This was done by: 1) developing regional breeding plans for diploid and tetraploid C. virginica targeted at the Gulf Coastal Region, 2) assessing the effect of chromosome set manipulation on gonadal development in diploid, triploid, and tetraploid C. virginica, 3) quantifying the variation of commercially important hatchery traits in triploid C. virginica larvae from different tetraploid parents, 4) developing an up-to-date remote setting manual for the Gulf Coastal Region for industry use, …

Workplace Learning Measures For Human Resource Development: Review And Summary, Sunyoung Park, Jae Young Lee

Faculty Publications

Purpose: The purpose of this paper is to review the existing workplace learning measures used in empirical studies in human resource development (HRD). Design/methodology/approach: By reviewing 141 studies on workplace learning published in six journals in the field of HRD, we identified nine measures for workplace learning. Tynjälä’s (2013) 3-P model of workplace learning was adopted as the framework to analyze the features of each measure in terms of presage, process and product. Findings: Workplace Climate Questionnaire, Learning Opportunities Questionnaire, Approaches to Work Questionnaire and Self-regulated Learning in the Workplace Questionnaire belong to the presage category. Small Business Workplace Learning …

Performance And Cost-Effectiveness Of Chip Seal And Microsurfacing In Flexible Pavements, Mohammad Zobair Ibne Bashar

LSU Master's Theses

Chip seal and microsurfacing are pavement maintenance activities typically used in relatively low traffic roads with the aim to reduce the rate of deterioration and to defer the need for costly rehabilitation activities. Chip seal is widely used in Louisiana, and Louisiana’s $6.3 million microsurfacing program is amongst the largest microsurfacing programs in the United States. As these surface treatments seal the road surface, the effectiveness of this treatment in such a setting has been a concern in recent years by linking it to moisture damage caused by the trapped moisture underneath the pavement. Furthermore, the cost-effectiveness and optimal timing …

Elastic Response Of The Electron Fluid In Intrinsic Graphene: The Collisionless Regime, Julia M. Link, Daniel E. Sheehy, Boris N. Narozhny, Jörg Schmalian

Faculty Publications

The elastic response of an electron fluid at finite frequencies is defined by the electron viscosity η(ω). We determine η(ω) for graphene at the charge neutrality point in the collisionless regime, including the leading corrections due to the electron-electron Coulomb interaction. We find interaction corrections to η(ω) that are significantly larger if compared to the corresponding corrections to the optical conductivity. In addition, we find comparable contributions to the dynamic momentum flux due to single-particle and many-particle effects. We also demonstrate that η(ω) is directly related to the nonlocal energy-flow response of graphene at the Dirac point. The viscosity in …

A General Synthesis Approach For Supported Bimetallic Nanoparticles Via Surface Inorganometallic Chemistry, Kunlun Ding, David A. Cullen, Laibao Zhang, Zhi Cao, Amitava D. Roy, Ilia N. Ivanov, Dongmei Cao

Faculty Publications

The synthesis of ultrasmall supported bimetallic nanoparticles (between 1 and 3 nanometers in diameter) with well-defined stoichiometry and intimacy between constituent metals remains a substantial challenge. We synthesized 10 different supported bimetallic nanoparticles via surface inorganometallic chemistry by decomposing and reducing surface-adsorbed heterometallic double complex salts, which are readily obtained upon sequential adsorption of target cations and anions on a silica substrate. For example, adsorption of tetraamminepalladium(II) [Pd(NH ) ] followed by adsorption of tetrachloroplatinate [PtCl ] was used to form palladium-platinum (Pd-Pt) nanoparticles. These supported bimetallic nanoparticles show enhanced catalytic performance in acetylene selective hydrogenation, which clearly demonstrates a …

A General Synthesis Approach For Supported Bimetallic Nanoparticles Via Surface Inorganometallic Chemistry, Kunlun Ding, David A. Cullen, Laibao Zhang, Zhi Cao, Amitava D. Roy, Ilia N. Ivanov, Dongmei Cao

Faculty Publications

The synthesis of ultrasmall supported bimetallic nanoparticles (between 1 and 3 nanometers in diameter) with well-defined stoichiometry and intimacy between constituent metals remains a substantial challenge. We synthesized 10 different supported bimetallic nanoparticles via surface inorganometallic chemistry by decomposing and reducing surface-adsorbed heterometallic double complex salts, which are readily obtained upon sequential adsorption of target cations and anions on a silica substrate. For example, adsorption of tetraamminepalladium(II) [Pd(NH ) ] followed by adsorption of tetrachloroplatinate [PtCl ] was used to form palladium-platinum (Pd-Pt) nanoparticles. These supported bimetallic nanoparticles show enhanced catalytic performance in acetylene selective hydrogenation, which clearly demonstrates a …

Parallel Tracks: Three Case Studies Of The Relationship Between Street Art And U.S. Museums In The Twenty-First Century, Erin Rolfs

LSU Master's Theses

An examination of three case studies involving U.S. museum exhibitions of street and graffiti art in the twenty-first century. This thesis covers the Brooklyn Museum of Art’s “Graffiti” show in 2006, Los Angeles’s Museum of Contemporary Art’s “Art in the Streets” in 2011, and the 2012-2015 activities of the Baton Rouge Museum of Public Art. These events offer a chronological and geographical range to provide a broad scope of investigation into the pitfalls and opportunities of museum’s exhibiting graffiti and street art. The heart of this research is not to prolong the debate about whether museums endanger their authority when …

Novel Design And Synthesis Of Composite Nanomaterials For Lithium And Multivalent Ion Batteries, Wangwang Xu

LSU Doctoral Dissertations

Nowadays, the fast-increasing energy demand for efficient, sustainable and environmentally-friendly energy storage devices remains a significant and challenging issue. Lithium ion batteries (LIBs) have been widely used as commercial energy devices in portable electronics and also shown great promise in upcoming large-scale applications due to their advantages of environmental safety, efficiency in energy delivering and light weight. However, due to their limited capacity, energy densities and cycle ability, LIBs still need further improvement to expand their applications to a larger field, especially electric vehicle (EVs) and hybrid electric vehicles (HEVs), in which energy storage devices with large capacity and high …

Flow Regimes And Adjustment To Wind-Driven Motions In Lake Pontchartrain Estuary: A Modeling Experiment Using Fvcom, Chunyan Li, Wei Huang, Changsheng Chen, Huichan Lin

Faculty Publications

Lake Pontchartrain is a brackish estuary and restricted lagoon in the microtidal northern Gulf of Mexico. Using a validated Finite Volume Community Ocean Model (FVCOM), we study the flow regimes and wind-driven adjustment of circulation in this system. It is found that tidal currents are only significant in the eastern end near the open boundary. Local wind inside the estuary is important in driving the circulation including coastal currents. Numerical experiments confirm that the subtidal wind-driven flow is in a quasi-steady balance between wind stress and surface slope. Our results show that the adjustment of surface level inside the system …

Carbon Fixation: Closing The Circle, Marylou C. Machingura, James V. Moroney

Faculty Publications

© Machingura and Moroney. In Chlamydomonas the different stages of the Calvin-Benson cycle take place in separate locations within the chloroplast.

Loss Of Dbc1 (Ccar2) Affects Tnfα-Induced Lipolysis And Glut4 Gene Expression In Murine Adipocytes, Ashley A. Able, Allison J. Richard, Jacqueline M. Stephens

Faculty Publications

© 2018 Society for Endocrinology Published by Bioscientifica Ltd. STAT5A (signal transducer and activator of transcription 5A) is a transcription factor that plays a role in adipocyte development and function. In this study, we report DBC1 (deleted in breast cancer 1 - also known as CCAR2) as a novel STAT5A-interacting protein. DBC1 has been primarily studied in tumor cells, but there is evidence that loss of this protein may promote metabolic health in mice. Currently, the functions of DBC1 in mature adipocytes are largely unknown. Using immunoprecipitation and immunoblotting techniques, we confirmed that there is an association between endogenous STAT5A …

Dna Methylomes Of Bovine Gametes And In Vivo Produced Preimplantation Embryos, Zongliang Jiang, Jianan Lin, Hong Dong, Xinbao Zheng, Sadie L. Marjani, Jingyue Duan, Zhengqing Ouyang, Jingbo Chen, Xiuchun Tian

Faculty Publications

© The Author(s) 2018. Published by Oxford University Press on behalf of Society for the Study of Reproduction. DNA methylation is an important epigenetic modification that undergoes dynamic changes in mammalian embryogenesis, during which both parental genomes are reprogrammed. Despite the many immunostaining studies that have assessed global methylation, the gene-specific DNA methylation patterns in bovine preimplantation embryos are unknown. Using reduced representation bisulfite sequencing, we determined genome-scale DNA methylation of bovine sperm and individual in vivo developed oocytes and preimplantation embryos. We show that (1) the major wave of genome-wide demethylation was completed by the 8-cell stage; (2) promoter …

Disappearance Of Phragmites In Louisiana And Nipponaclerda Biwakoensis, Rachel Tugger

Honors Capstones

No abstract provided.

Physiological And Genomic Characterization Of Novel Isolate From Om252 Clade Of The Gammaproteobacteria, Emily Nall

Honors Capstones

No abstract provided.

Single Cell Analysis Of Fluid Shear Stress Induced Breast Cancer Cell Phenotypic Changes In A Microfluidic Device, Grant Landwehr

Honors Capstones

No abstract provided.

Intestinal Microbiome Composition Of An Acute In Vivo Alzheimer’S Disease Rat Model, Jimmy Saravia

Honors Capstones

No abstract provided.

The Kelt Follow-Up Network And Transit False-Positive Catalog: Pre-Vetted False Positives For Tess, Karen A. Collins, Kevin I. Collins, Joshua Pepper, Jonathan Labadie-Bartz, Keivan G. Stassun, B. Scott Gaudi, Daniel Bayliss, Joao Bento, Knicole D. Colon, Dax Feliz, David James, Marshall C. Johnson, Rudolf B. Kuhn, Michael B. Lund, Matthew T. Penny, Joseph E. Rodriguez, Robert J. Siverd, Daniel J. Stevens, Xinyu Yao, George Zhou, Mundra Akshay, Giulio F. Aldi, Cliff Ashcraft, Supachai Awiphan, Bzgür Baştürk, David Baker, Thomas G. Beatty, Paul Benni, Perry Berlind, G. Bruce Berriman, Zach Berta-Thompson, Allyson Bieryla, Valerio Bozza

Faculty Publications

The Kilodegree Extremely Little Telescope (KELT) project has been conducting a photometric survey of transiting planets orbiting bright stars for over 10 years. The KELT images have a pixel scale of ∼23″ pixel-1 - very similar to that of NASA's Transiting Exoplanet Survey Satellite (TESS) - as well as a large point-spread function, and the KELT reduction pipeline uses a weighted photometric aperture with radius 3′. At this angular scale, multiple stars are typically blended in the photometric apertures. In order to identify false positives and confirm transiting exoplanets, we have assembled a follow-up network (KELT-FUN) to conduct imaging with …

Spatiotemporal Filtering Of High Harmonics In Solids, Christopher Q. Abadie, Mengxi Wu, Mette B. Gaarde

Faculty Publications

We study the macroscopic spatial and temporal properties of harmonic radiation generated by a model solid in the interaction with an intense, focused laser beam. We show that different temporal contributions to the harmonic yield can be separated in the spatial domain because they lead to radiation with different divergences, similar to what is observed in gas-phase harmonic generation. We show that applying a spatial filter in the far field results in a temporal separation of the two contributions upon refocusing, which yields spatially collimated harmonics, a spectrum with well-resolved peaks, and a subcycle time profile of the harmonic radiation …

The Coupling Of Bay Hydrodynamics To Sediment Transport And Its Implication In Micro-Tidal Wetland Sustainability, Jiaze Wang, Kehui Xu, Giancarlo A. Restreppo, Samuel J. Bentley, Xuelian Meng, Xukai Zhang

Faculty Publications

© 2018 Elsevier B.V. To investigate bay hydrodynamics and its impacts on the adjacent micro-tidal wetland sustainability, hourly measurements of wave, tidal current, and benthic suspended sediment concentration in summer, winter, and spring of 2015–2016 were conducted in Fourleague Bay, Louisiana, USA. High-temporal resolution data indicate that benthic suspended sediment resuspension had a dominant periodicity of 4.8-d, which was mainly caused by wind-driven waves. Sediment flux reached 28 g·m−2·s−1 during events. Net sediment flux direction is northwestward in summer, and southeastward in winter and spring. Potential depth-integrated sediment flux to surrounding wetland varied within 0–500 g·m−1·s−1. Seasonal variations of river …

Understanding Context Dependency In The Response Of Forest Understorey Plant Communities To Nitrogen Deposition, Michael P. Perring, Martin Diekmann, Gabriele Midolo, David Schellenberger Costa, Markus Bernhardt-Römermann, Johanna C.J. Otto, Frank S. Gilliam, Per Ola Hedwall, Annika Nordin, Thomas Dirnböck, Samuel M. Simkin, František Máliš, Haben Blondeel, Jörg Brunet, Markéta Chudomelová, Tomasz Durak, Pieter De Frenne, Radim Hédl, Martin Kopecký, Dries Landuyt, Daijiang Li, Peter Manning, Petr Petřík, Kamila Reczyńska, Wolfgang Schmidt, Tibor Standovár, Krzysztof Świerkosz, Ondřej Vild, Donald M. Waller, Kris Verheyen

Faculty Publications

© 2018 Elsevier Ltd Understorey communities can dominate forest plant diversity and strongly affect forest ecosystem structure and function. Understoreys often respond sensitively but inconsistently to drivers of ecological change, including nitrogen (N) deposition. Nitrogen deposition effects, reflected in the concept of critical loads, vary greatly not only among species and guilds, but also among forest types. Here, we characterize such context dependency as driven by differences in the amounts and forms of deposited N, cumulative deposition, the filtering of N by overstoreys, and available plant species pools. Nitrogen effects on understorey trajectories can also vary due to differences in …

An Ethanolic Extract Of Artemisia Scoparia Inhibits Lipolysis In Vivo And Has Antilipolytic Effects On Murine Adipocytes In Vitro, Anik Boudreau, Allison J. Richard, Jasmine A. Burrell, William T. King, Ruth Dunn, Jean Marc Schwarz, David M. Ribnicky, Jennifer Rood, J. Michael Salbaum, Jacqueline M. Stephens

Faculty Publications

© 2018, American Physiological Society. All rights reserved. An ethanolic extract of Artemisia scoparia (SCO) has metabolically favorable effects on adipocyte development and function in vitro and in vivo. In diet-induced obese mice, SCO supplementation significantly reduced fasting glucose and insulin levels. Given the importance of adipocyte lipolysis in metabolic health, we hypothesized that SCO modulates lipolysis in vitro and in vivo. Free fatty acids and glycerol were measured in the sera of mice fed a high-fat diet with or without SCO supplementation. In cultured 3T3-L1 adipocytes, the effects of SCO on lipolysis were assessed by measuring glycerol and free …

Maternal Encouragement Of Modest Behavior, Temperamental Shyness, And Anxious Withdrawal Linkages To Chinese American Children's Social Adjustment: A Moderated Mediation Analysis, Merve Balkaya, Charissa S.L. Cheah, Jing Yu, Craig H. Hart, Shuyan Sun

Faculty Publications

© 2018 John Wiley & Sons Ltd Past studies have revealed potential differences in the functional meaning and social evaluation of children's temperamental shyness between Chinese interdependence-oriented and North American independence-oriented cultural contexts. However, very little is known about shy Chinese American children's adjustment in Western school contexts and potential pathways underlying their adjustment. To address this gap in the literature, we examined the associations between Chinese American children's temperamental shyness and their social adjustment outcomes, including peer exclusion, prosocial behavior, and assertiveness/leadership skills. In addition, the mediating role of children's display of anxious-withdrawn behavior and the moderating role of …

Enhancer-Driven Alternative Promoters Of Imprinted Genes, Joomyeong Kim, Bambarendage P.U. Perera, Subash Ghimire

Faculty Publications

© 2018 Kim et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. In the current study, we characterized the expression and histone modification profiles of the alternative promoters found within imprinted Igf2r, Mest, Zac1, Peg3, Snrpn and non-imprinted Myc loci. In terms of expression pattern, the alternative promoters are highly tissue-specific, which is in a stark contrast to the ubiquitous expression of the corresponding main promoters. The alternative promoters are associated with the …