Open Access. Powered by Scholars. Published by Universities.®

Digital Commons Network™

Open Access. Powered by Scholars. Published by Universities.®

Louisiana State University

Discipline
Keyword
Publication Year
Publication
Publication Type
File Type

Articles 4231 - 4260 of 45176

Full-Text Articles in Entire DC Network

Examining Drivers’ Behaviors To Connected And Automated Vehicles, Hany Hassan, Taniya Sultana Sep 2022

Examining Drivers’ Behaviors To Connected And Automated Vehicles, Hany Hassan, Taniya Sultana

Data

It is envisioned that Connected and Automated Vehicles (CAVs) are the future of transportation as they can assist in minimizing some inefficiencies with the current transport systems. However, it is not clear how drivers of conventional vehicles would interact with CAVs in a mixed traffic environment containing both CAVs and human driven vehicles (HDVs). Thus, this study aims to investigate drivers’ behaviors towards CAVs through driving simulation experiment and national survey study. Two on-ramp and two off-ramp driving simulation scenarios were designed where drivers were asked to merge with two-lane highway in presence of HDVs and CAVs truck platoon in …

Go to article

Riverine Dissolved Organic Matter (Dom) As Affected By Urbanization Gradient, Liuqing Zhang, Y. Jun Xu, Siyue Li Sep 2022

Riverine Dissolved Organic Matter (Dom) As Affected By Urbanization Gradient, Liuqing Zhang, Y. Jun Xu, Siyue Li

Faculty Publications

Rapid urbanization has considerably altered carbon biogeochemical cycle and river hydrology. However, the influences of urban land use and urban-induced nutrient increase on dissolved organic matter (DOM) characteristics are poorly understood. Here we hypothesize that the alterations significantly change sources and levels of DOM in river systems that drain the urban areas. To test the hypothesis, we investigated DOM in headwater rivers with varied urban intensities in the Three Gorges Reservoir Area (TGRA), China, through field sampling conducted in the dry and wet seasons. We found positive relationships of urban land (%Urban) with DOC concentration and chromophoric DOM (CDOM) absorption …

Go to article

Roosting Ecology Of Gould's Wild Turkeys In Southeastern Arizona, Nicholas W. Bakner, Nathan Fyffe, Brittany Oleson, Alex Smallwood, James R. Heffelfinger, Michael J. Chamberlain, Bret A. Collier Sep 2022

Roosting Ecology Of Gould's Wild Turkeys In Southeastern Arizona, Nicholas W. Bakner, Nathan Fyffe, Brittany Oleson, Alex Smallwood, James R. Heffelfinger, Michael J. Chamberlain, Bret A. Collier

Faculty Publications

Availability of suitable roosting sites influences distribution of wild turkeys (Meleagris gallopavo) across the landscape. In semi-arid environments, roosts are limited to riparian corridors capable of supporting trees large enough to provide suitable roost sites. Gould's wild turkeys (M. g. mexicana) are spatially restricted to mountainous semi-arid areas of southwestern United States and Mexico, and information on their distribution and habitat use is limited. We evaluated roost site selection and fidelity of Gould's wild turkeys relative to environmental gradients and forested land cover during 2016–2017 in southeastern Arizona, USA. We monitored 51 global positioning system (GPS)-tagged individuals and collected 7,954 …

Go to article

Spatiotemporal Patterns Of Male And Female White-Tailed Deer On A Hunted Landscape, Dylan G. Stewart, William D. Gulsby, Stephen S. Ditchkoff, Bret A. Collier Sep 2022

Spatiotemporal Patterns Of Male And Female White-Tailed Deer On A Hunted Landscape, Dylan G. Stewart, William D. Gulsby, Stephen S. Ditchkoff, Bret A. Collier

Faculty Publications

Resource selection in sexually dimorphic ungulates is at least partially explained by sex-specific resource requirements and risk aversion strategies. Females generally spend more time in areas with less risk and abundant, high-quality forage due to their smaller body size. However, demographically variable responses to risk are context dependent, and few have concurrently quantified male and female behavior within areas with the same resource base. We captured 111 (54 males, 57 females) adult white-tailed deer (Odocoileus virginianus) from 2009 to 2018 on a site in South Carolina, USA, where hunters were the primary source of adult mortality. We fit each deer …

Go to article

Abstinence Phobia Among Adult African American/Black Cannabis Users, Michael J. Zvolensky, Brooke Y. Kauffman, Lorra Garey, Julia D. Buckner Sep 2022

Abstinence Phobia Among Adult African American/Black Cannabis Users, Michael J. Zvolensky, Brooke Y. Kauffman, Lorra Garey, Julia D. Buckner

Faculty Publications

Objective: African American/Black individuals experience significant health disparities, particularly as it relates to cannabis use. As such, there is a need to identify intrapersonal factors related to more severe patterns of use among this subpopulation. Worry about quitting or reducing cannabis as a result of the anticipated anxiety-related states during deprivation (i.e., abstinence phobia) is one factor that is theoretically important in the context of cannabis-related disparities. Method: The current study sought to examine the cross-sectional association between abstinence phobia and cannabis use problems, perceived barriers for cannabis cessation, and cannabis withdrawal symptoms. Participants included 83 African American/Black cannabis users …

Go to article

Adipocyte-Specific Laminin Alpha 4 Deletion Preserves Adipose Tissue Health Despite Increasing Adiposity, Jennifer L. Bailey, David H. Burk, Susan J. Burke, Scott D. Reed, Sujoy Ghosh, Carrie M. Elks Sep 2022

Adipocyte-Specific Laminin Alpha 4 Deletion Preserves Adipose Tissue Health Despite Increasing Adiposity, Jennifer L. Bailey, David H. Burk, Susan J. Burke, Scott D. Reed, Sujoy Ghosh, Carrie M. Elks

Division of Basic Science Faculty Publications

Laminins are heterotrimeric glycoproteins with structural and functional roles in basement membranes. The predominant laminin alpha chain found in adipocyte basement membranes is laminin α4 (LAMA4). Global LAMA4 deletion in mice leads to reduced adiposity and increased energy expenditure, but also results in vascular defects that complicate the interpretation of metabolic data. Here, we describe the generation and initial phenotypic analysis of an adipocyte-specific LAMA4 knockout mouse (Lama4AKO). We first performed an in-silico analysis to determine the degree to which laminin α4 was expressed in human and murine adipocytes. Next, male Lama4AKO and control mice were fed chow or high-fat …

Go to article

Climate Trends And Behavior Of A Model Amazonian Terrestrial Insectivore, Black-Faced Antthrush, Indicate Adjustment To Hot And Dry Conditions, Vitek Jirinec, Elisa C. Elizondo, Patricia F. Rodrigues, Philip C. Stouffer Sep 2022

Climate Trends And Behavior Of A Model Amazonian Terrestrial Insectivore, Black-Faced Antthrush, Indicate Adjustment To Hot And Dry Conditions, Vitek Jirinec, Elisa C. Elizondo, Patricia F. Rodrigues, Philip C. Stouffer

Faculty Publications

Rainforest loss threatens terrestrial insectivorous birds throughout the world's tropics. Recent evidence suggests these birds are declining in undisturbed Amazonian rainforest, possibly due to climate change. Here, we first asked whether Amazonian terrestrial insectivorous birds were exposed to increasingly extreme ambient conditions using 38 years of climate data. We found long-term trends in temperature and precipitation at our study site, especially in the dry season, which was ~1.3°C hotter and 21% drier in 2019 than in 1981. Second, to test whether birds actively avoided hot and dry conditions, we used field sensors to identify periodic intervals of ambient extremes and …

Go to article

Effectiveness Of Early Time-Restricted Eating For Weight Loss, Fat Loss, And Cardiometabolic Health In Adults With Obesity: A Randomized Clinical Trial, Humaira Jamshed, Felicia L. Steger, David R. Bryan, Joshua S. Richman, Amy H. Warriner, Cody J. Hanick, Corby K. Martin, Sarah Jeanne Salvy, Courtney M. Peterson Sep 2022

Effectiveness Of Early Time-Restricted Eating For Weight Loss, Fat Loss, And Cardiometabolic Health In Adults With Obesity: A Randomized Clinical Trial, Humaira Jamshed, Felicia L. Steger, David R. Bryan, Joshua S. Richman, Amy H. Warriner, Cody J. Hanick, Corby K. Martin, Sarah Jeanne Salvy, Courtney M. Peterson

Clinical Research Faculty Publications

Importance: It is unclear how effective intermittent fasting is for losing weight and body fat, and the effects may depend on the timing of the eating window. This randomized trial compared time-restricted eating (TRE) with eating over a period of 12 or more hours while matching weight-loss counseling across groups. Objective: To determine whether practicing TRE by eating early in the day (eTRE) is more effective for weight loss, fat loss, and cardiometabolic health than eating over a period of 12 or more hours. Design, Setting, and Participants: The study was a 14-week, parallel-arm, randomized clinical trial conducted between August …

Go to article

Defining Relative Yield For Soil Test Correlation And Calibration Trials In The Fertilizer Recommendation Support Tool, Austin W. Pearce, Nathan A. Slaton, Sarah E. Lyons, Carl H. Bolster, Tom W. Bruulsema, John H. Grove, John D. Jones, Josh M. Mcgrath, Fernando E. Miguez, Nathan O. Nelson, Deanna L. Osmond, Md Rasel Parvej, Eugenia M. Pena-Yewtukhiw, John T. Spargo Sep 2022

Defining Relative Yield For Soil Test Correlation And Calibration Trials In The Fertilizer Recommendation Support Tool, Austin W. Pearce, Nathan A. Slaton, Sarah E. Lyons, Carl H. Bolster, Tom W. Bruulsema, John H. Grove, John D. Jones, Josh M. Mcgrath, Fernando E. Miguez, Nathan O. Nelson, Deanna L. Osmond, Md Rasel Parvej, Eugenia M. Pena-Yewtukhiw, John T. Spargo

Faculty Publications

The Fertilizer Recommendation Support Tool (FRST) will perform correlations between soil nutrient concentrations and crop response to fertilization from user-selected datasets in the FRST national database. Yield response for the nutrient of interest in a particular site-year is presented as relative yield (RY), a ratio of unfertilized yield to the maximum attainable yield (A). Several methods exist in the literature for estimating A and calculating RY but the effect of method choice on soil test correlation outcomes is undocumented. We used six published methods to calculate RY from site-year yield data for five published correlation datasets, and fit a generalized …

Go to article

Association Of Cognition With Leptin And Vascular Endothelial Growth Factor In Individuals With Type 2 Diabetes Mellitus, Mark A. Espeland, Joni K. Evans, Owen Carmichael, Jose A. Luchsinger, Santica M. Marcovina, Rebecca Neiberg, Karen C. Johnson, Steven E. Kahn, Kathleen M. Hayden Sep 2022

Association Of Cognition With Leptin And Vascular Endothelial Growth Factor In Individuals With Type 2 Diabetes Mellitus, Mark A. Espeland, Joni K. Evans, Owen Carmichael, Jose A. Luchsinger, Santica M. Marcovina, Rebecca Neiberg, Karen C. Johnson, Steven E. Kahn, Kathleen M. Hayden

Clinical Research Faculty Publications

Objective: The 10-year intensive lifestyle intervention (ILI) of the Look AHEAD study left a legacy of relative deficits in cognitive function among participants who entered the clinical trial with obesity or a history of cardiovascular disease. We hypothesized that altered levels of two weight-sensitive proangiogenic cytokines, leptin and vascular endothelial growth factor (VEGF), accounted for this concerning finding. Methods: Serum leptin and VEGF concentrations were determined in 1,279 Look AHEAD participants at baseline, proximal to cessation of the interventions (Epoch 1), and an average of 4 years later (Epoch 2). Up to four standardized assessments of attention, executive function, and …

Go to article

Applied Nutritional Investigationeffects Of Acute Arginine Supplementation On Neuroendocrine, Metabolic, Cardiovascular, And Mood Outcomes In Younger Men: A Double-Blind, Placebo-Controlled Trial, John W. Apolzan, Jesse A. Stein, Jennifer C. Rood, Robbie A. Beyl, Shengping Yang, Frank L. Greenway, Harris R. Lieberman Sep 2022

Applied Nutritional Investigationeffects Of Acute Arginine Supplementation On Neuroendocrine, Metabolic, Cardiovascular, And Mood Outcomes In Younger Men: A Double-Blind, Placebo-Controlled Trial, John W. Apolzan, Jesse A. Stein, Jennifer C. Rood, Robbie A. Beyl, Shengping Yang, Frank L. Greenway, Harris R. Lieberman

Clinical Research Faculty Publications

Objectives: Arginine is an amino-acid supplement and precursor for nitric-oxide synthesis, which affects various biologic processes. The objective of this study was to determine the effects of arginine supplementation on growth hormone (GH) and metabolic parameters. Methods: Thirty physically active, healthy men (age 18–39 y; body mass index: 18.5–25 kg/m2) were randomized in a double-blind, placebo-controlled, crossover trial. Arginine (10 g) and placebo (0 g) beverages were consumed after an overnight fast. Blood samples were collected at baseline and 1.5, 3.0, and 24 h after supplementation. The primary outcomes were serum GH and metabolomics. Also, amino acids, glucose, insulin, triacylglycerols, …

Go to article

Reference Staffing And Scheduling Models In Archives And Special Collections: A Survey Analysis Of Prepandemic Practices, Amanda K. Hawk Sep 2022

Reference Staffing And Scheduling Models In Archives And Special Collections: A Survey Analysis Of Prepandemic Practices, Amanda K. Hawk

Faculty Publications

Reference services form the core function of any type of library. Even when faced with shrinking budgets and staff sizes, library and archives workers continue to provide reference services to meet the demands of researchers. Yet a critical analysis of the internal systems used for archival and special collections reference work is lacking compared to the robust body of research about users of collection materials. This article presents findings from a national survey about reference staffing and scheduling models in archival and special collections repositories conducted immediately prior to the onset of the COVID-19 pandemic. The survey data revealed specific …

Go to article

Evaluation Of Models For Utilization In Genomic Prediction Of Agronomic Traits In The Louisiana Sugarcane Breeding Program, Subhrajit Satpathy, Dipendra Shahi, Brayden Blanchard, Michael Pontif, Kenneth Gravois, Collins Kimbeng, Anna Hale, James Todd, Atmakuri Rao, Niranjan Baisakh Sep 2022

Evaluation Of Models For Utilization In Genomic Prediction Of Agronomic Traits In The Louisiana Sugarcane Breeding Program, Subhrajit Satpathy, Dipendra Shahi, Brayden Blanchard, Michael Pontif, Kenneth Gravois, Collins Kimbeng, Anna Hale, James Todd, Atmakuri Rao, Niranjan Baisakh

Faculty Publications

Sugarcane (Saccharum spp.) is an important perennial grass crop for both sugar and biofuel industries. The Louisiana sugarcane breeding program is focused on improving sugar yield by incrementally increasing genetic gain. With the advancement in genotyping and (highthroughput) phenotyping techniques, genomic selection is a promising marker-assisted breeding tool. In this study, we assessed ridge regression best linear unbiased prediction (rrBLUP) and various Bayesian models to evaluate genomic prediction accuracy using a 10-fold cross validation on 95 commercial and elite parental clones from the Louisiana sugarcane breeding program. Datasets (individual and pooled in various combinations) were constructed based on soil type …

Go to article

Measurement Of The Π- -Ar Total Hadronic Cross Section At The Lariat Experiment, E. Gramellini, J. Ho, R. Acciarri, C. Adams, J. Asaadi, M. Backfish, W. Badgett, B. Baller, V. Basque, O. Benevides Rodrigues, F. D.M. Blaszczyk, R. Bouabid, C. Bromberg, R. Carey, R. Castillo Fernandez, F. Cavanna, J. I. Cevallos Aleman, A. Chatterjee, P. Dedin, M. V. Dos Santos, D. Edmunds, C. Escobar, J. Esquivel, J. J. Evans, A. Falcone, W. Flanagan, B. T. Fleming, W. Foreman, D. Garcia-Gamez, D. Gastler, T. Ghosh, R. A. Gomes, R. Gran Sep 2022

Measurement Of The Π- -Ar Total Hadronic Cross Section At The Lariat Experiment, E. Gramellini, J. Ho, R. Acciarri, C. Adams, J. Asaadi, M. Backfish, W. Badgett, B. Baller, V. Basque, O. Benevides Rodrigues, F. D.M. Blaszczyk, R. Bouabid, C. Bromberg, R. Carey, R. Castillo Fernandez, F. Cavanna, J. I. Cevallos Aleman, A. Chatterjee, P. Dedin, M. V. Dos Santos, D. Edmunds, C. Escobar, J. Esquivel, J. J. Evans, A. Falcone, W. Flanagan, B. T. Fleming, W. Foreman, D. Garcia-Gamez, D. Gastler, T. Ghosh, R. A. Gomes, R. Gran

Faculty Publications

We present the first measurement of the negative pion total hadronic cross section on argon in a restricted phase space, which we performed at the Liquid Argon In A Testbeam (LArIAT) experiment. All hadronic reaction channels, as well as hadronic elastic interactions with scattering angle greater than 5° are included. The pions have kinetic energies in the range 100-700 MeV and are produced by a beam of charged particles impinging on a solid target at the Fermilab test beam facility. LArIAT employs a 0.24 ton active mass liquid argon time projection chamber (LArTPC) to measure the pion hadronic interactions. For …

Go to article

Bloch Waves In High Contrast Electromagnetic Crystals, Robert Lipton, Robert Viator, Silvia Jiménez Bolanõs, Abiti Adili Sep 2022

Bloch Waves In High Contrast Electromagnetic Crystals, Robert Lipton, Robert Viator, Silvia Jiménez Bolanõs, Abiti Adili

Faculty Publications

Analytic representation formulas and power series are developed describing the band structure inside non-magnetic periodic photonic three-dimensional crystals made from high dielectric contrast inclusions. Central to this approach is the identification and utilization of a resonance spectrum for quasiperiodic source-free modes. These modes are used to represent solution operators associated with electromagnetic and acoustic waves inside periodic high contrast media. A convergent power series for the Bloch wave spectrum is recovered from the representation formulas. Explicit conditions on the contrast are found that provide lower bounds on the convergence radius. These conditions are sufficient for the separation of spectral branches …

Go to article

Early To Middle Miocene Ice Sheet Dynamics In The Westernmost Ross Sea (Antarctica): Regional Correlations, Lara F. Pérez, Robert M. Mckay, Laura De Santis, Robert D. Larter, Richard H. Levy, Timothy R. Naish, John B. Anderson, Philip J. Bart, Martina Busetti, Gavin Dunbar, Chiara Sauli, Christopher C. Sorlien, Marvin Speece Sep 2022

Early To Middle Miocene Ice Sheet Dynamics In The Westernmost Ross Sea (Antarctica): Regional Correlations, Lara F. Pérez, Robert M. Mckay, Laura De Santis, Robert D. Larter, Richard H. Levy, Timothy R. Naish, John B. Anderson, Philip J. Bart, Martina Busetti, Gavin Dunbar, Chiara Sauli, Christopher C. Sorlien, Marvin Speece

Faculty Publications

The present-day morpho-stratigraphy of the Ross Sea is the result of Cenozoic tectonic and cryospheric events, and constitutes a key record of Antarctica's cryospheric evolution. An enduring problem in interpreting this record in a broader regional context is that the correlation between eastern and western Ross Sea stratigraphy has remained uncertain due to the limited number of drill sites. We correlate the glacial-related features observed on a dense network of seismic reflection profiles in McMurdo Sound with those identified in the Nordenskjöld and Drygalski Basins, as well as the basins farther east in the central Ross Sea. We present an …

Go to article

Does Inflation Squeeze Cosmological Perturbations?, Ivan Agullo, Béatrice Bonga, Patricia Ribes Metidieri Sep 2022

Does Inflation Squeeze Cosmological Perturbations?, Ivan Agullo, Béatrice Bonga, Patricia Ribes Metidieri

Faculty Publications

There seems to exist agreement about the fact that inflation squeezes the quantum state of cosmological perturbations and entangles modes with wavenumbers k⟶ and -k⟶. Paradoxically, this result has been used to justify both the classicality as well as the quantumness of the primordial perturbations at the end of inflation. We reexamine this question and point out that the definition of two-mode squeezing of the modes k⟶ and -k⟶ used in previous work rests on choices that are only justified for systems with time-independent Hamiltonians and finitely many degrees of freedom. We argue that for quantum fields propagating on generic …

Go to article

A Detailed Analysis Of The Gl 486 Planetary System, J. A. Caballero, E. González-Álvarez, M. Brady, T. Trifonov, T. G. Ellis, C. Dorn, C. Cifuentes, K. Molaverdikhani, J. L. Bean, T. Boyajian, E. Rodríguez, J. Sanz-Forcada, M. R. Zapatero Osorio, C. Abia, P. J. Amado, N. Anugu, V. J.S. Béjar, C. L. Davies, S. Dreizler, F. Dubois, J. Ennis, N. Espinoza, C. D. Farrington, A. García López, T. Gardner, A. P. Hatzes, Th Henning, E. Herrero, E. Herrero-Cisneros, A. Kaminski, D. Kasper, R. Klement, S. Kraus Sep 2022

A Detailed Analysis Of The Gl 486 Planetary System, J. A. Caballero, E. González-Álvarez, M. Brady, T. Trifonov, T. G. Ellis, C. Dorn, C. Cifuentes, K. Molaverdikhani, J. L. Bean, T. Boyajian, E. Rodríguez, J. Sanz-Forcada, M. R. Zapatero Osorio, C. Abia, P. J. Amado, N. Anugu, V. J.S. Béjar, C. L. Davies, S. Dreizler, F. Dubois, J. Ennis, N. Espinoza, C. D. Farrington, A. García López, T. Gardner, A. P. Hatzes, Th Henning, E. Herrero, E. Herrero-Cisneros, A. Kaminski, D. Kasper, R. Klement, S. Kraus

Faculty Publications

Context. The Gl 486 system consists of a very nearby, relatively bright, weakly active M3.5 V star at just 8 pc with a warm transiting rocky planet of about 1.3 RO and 3.0 MO. It is ideal for both transmission and emission spectroscopy and for testing interior models of telluric planets. Aims. To prepare for future studies, we aim to thoroughly characterise the planetary system with new accurate and precise data collected with state-of-the-art photometers from space and spectrometers and interferometers from the ground. Methods. We collected light curves of seven new transits observed with the CHEOPS space mission and …

Go to article

Higher-Rank Radon Transforms On Constant Curvature Spaces, B. Rubin Sep 2022

Higher-Rank Radon Transforms On Constant Curvature Spaces, B. Rubin

Faculty Publications

We study higher-rank Radon transforms of the form f(τ) → ∫ τ⊂ζf(τ) , where τ is a j-dimensional totally geodesic submanifold in the n-dimensional real constant curvature space and ζ is a similar submanifold of dimension k> j. The corresponding dual transforms are also considered. The transforms are explored in the Euclidean case (affine Grassmannian bundles), the elliptic case (compact Grassmannians), and the hyperbolic case (the hyperboloid model, the Beltrami-Klein model, and the projective model). The main objectives are sharp conditions for the existence and injectivity of the Radon transforms in Lebesgue spaces, transition from one model to another, support …

Go to article

High-Dimensional Encryption In Optical Fibers Using Spatial Modes Of Light And Machine Learning, Michelle L.J. Lollie, Fatemeh Mostafavi, Narayan Bhusal, Mingyuan Hong, Chenglong You, Roberto De J. León-Montiel, Omar S. Magaña-Loaiza, Mario A. Quiroz-Juárez Sep 2022

High-Dimensional Encryption In Optical Fibers Using Spatial Modes Of Light And Machine Learning, Michelle L.J. Lollie, Fatemeh Mostafavi, Narayan Bhusal, Mingyuan Hong, Chenglong You, Roberto De J. León-Montiel, Omar S. Magaña-Loaiza, Mario A. Quiroz-Juárez

Faculty Publications

The ability to engineer the spatial wavefunction of photons has enabled a variety of quantum protocols for communication, sensing, and information processing. These protocols exploit the high dimensionality of structured light enabling the encoding of multiple bits of information in a single photon, the measurement of small physical parameters, and the achievement of unprecedented levels of security in schemes for cryptography. Unfortunately, the potential of structured light has been restrained to free-space platforms in which the spatial profile of photons is preserved. Here, we make an important step forward to using structured light for fiber optical communication. We introduce a …

Go to article

Neural Network Solver For Small Quantum Clusters, Nicholas Walker, Samuel Kellar, Yi Zhang, Ka Ming Tam, Juana Moreno Sep 2022

Neural Network Solver For Small Quantum Clusters, Nicholas Walker, Samuel Kellar, Yi Zhang, Ka Ming Tam, Juana Moreno

Faculty Publications

Machine learning approaches have recently been applied to the study of various problems in physics. Most of these studies are focused on interpreting the data generated by conventional numerical methods or the data on an existing experimental database. An interesting question is whether it is possible to use a machine learning approach, in particular a neural network, for solving the many-body problem. In this paper, we present a neural network solver for the single impurity Anderson model, the paradigm of an interacting quantum problem in small clusters. We demonstrate that the neural-network-based solver provides quantitative accurate results for the spectral …

Go to article

Visceral, Subcutaneous, And Total Fat Mass Accumulation In A Prospective Cohort Of Adolescents, Amanda E. Staiano, Peter T. Katzmarzyk Sep 2022

Visceral, Subcutaneous, And Total Fat Mass Accumulation In A Prospective Cohort Of Adolescents, Amanda E. Staiano, Peter T. Katzmarzyk

Population and Public Health Science Faculty Publications

Background: Race and sex differences in adolescents’ body fat are demonstrated in cross-sectional cohorts, yet a longitudinal design would better identify patterns of fat distribution over time. Objectives: The aim was to examine race and sex differences in adiposity between black and white adolescents over 2 y. Methods: A cohort of adolescents aged 10–16 y (38% black; 52% girls; 15% overweight, 34% with obesity) underwent body composition measurements at baseline (n = 309) and 2 y later (n = 236), using DXA to quantify whole-body fat mass (FM) and MRI for abdominal subcutaneous (SAT) and visceral adipose tissue (VAT) volumes. …

Go to article

Estimating R0 From Early Exponential Growth: Parallels Between 1918 Influenza And 2020 Sars-Cov-2 Pandemics, Grant Foster, Bret D. Elderd, Robert L. Richards, Tad Dallas Sep 2022

Estimating R0 From Early Exponential Growth: Parallels Between 1918 Influenza And 2020 Sars-Cov-2 Pandemics, Grant Foster, Bret D. Elderd, Robert L. Richards, Tad Dallas

Faculty Publications

The large spatial scale, geographical overlap, and similarities in transmission mode between the 1918 H1N1 influenza and 2020 SARS-CoV-2 pandemics together provide a novel opportunity to investigate relationships between transmission of two different diseases in the same location. To this end, we use initial exponential growth rates in a Bayesian hierarchical framework to estimate the basic reproductive number, R0, of both disease outbreaks in a common set of 43 cities in the United States. By leveraging multiple epidemic time series across a large spatial area, we are able to better characterize the variation in R0 across the United States. Additionally, …

Go to article

Right-Angled Artin Subgroups Of Artin Groups, Kasia Jankiewicz, Kevin Schreve Sep 2022

Right-Angled Artin Subgroups Of Artin Groups, Kasia Jankiewicz, Kevin Schreve

Faculty Publications

The Tits Conjecture, proved by Crisp and Paris, states that squares of the standard generators of any Artin group generate an obvious right-angled Artin subgroup. We consider a larger set of elements consisting of all the centers of the irreducible spherical special subgroups of the Artin group, and conjecture that sufficiently large powers of those elements generate an obvious right-angled Artin subgroup. This alleged right-angled Artin subgroup is in some sense as large as possible; its nerve is homeomorphic to the nerve of the ambient Artin group. We verify this conjecture for the class of locally reducible Artin groups, which …

Go to article

A New Soft Red Winter Wheat Cultivar ‘Ga 08535-15le29’ Adapted To Georgia And The U.S. Southeast Region, Mohamed Mergoum, Jerry Johnson, James Buck, G. David Buntin, Steve Sutton, Benjamin Lopez, Daniel Mailhot, Zhenbang Chen, Dan Bland, Stephen Harrison, Joseph Paul Murphy, Esten Mason, Russell Lane Sutton, Ali Babar, Gina Brown-Guedira, Amir Ibrahim, Richard E. Boyles, Byung Kee Baik, David Marshall, Carl Allen Griffey, Sue Ellen Cambron, Xianming Chen, Christina Cowger Sep 2022

A New Soft Red Winter Wheat Cultivar ‘Ga 08535-15le29’ Adapted To Georgia And The U.S. Southeast Region, Mohamed Mergoum, Jerry Johnson, James Buck, G. David Buntin, Steve Sutton, Benjamin Lopez, Daniel Mailhot, Zhenbang Chen, Dan Bland, Stephen Harrison, Joseph Paul Murphy, Esten Mason, Russell Lane Sutton, Ali Babar, Gina Brown-Guedira, Amir Ibrahim, Richard E. Boyles, Byung Kee Baik, David Marshall, Carl Allen Griffey, Sue Ellen Cambron, Xianming Chen, Christina Cowger

Faculty Publications

Soft red winter wheat (SRWW) (Triticum aestivum L.) production in the southeastern United States is affected by biotic and abiotic stresses that can result in yield losses and reduced acreage. Developing new cultivars with high yield, good resistance to predominant pests, and acceptable quality to maximize value in regional markets is needed. The University of Georgia (UGA) SRWW breeding program, in collaboration with institutions in the region including the Southern UNiversities GRAINS (SUNGRAINS) programs, is responding to these challenges by developing and releasing superior cultivars adapted to the region. ‘GA 08535-15LE29’ (Reg. no. CV-1191, PI 693269) SRWW cultivar was developed …

Go to article

Development And Validation Of An Optimized Marker Set For Genomic Selection In Southern U.S. Rice Breeding Programs, Tommaso Cerioli, Christopher O. Hernandez, Brijesh Angira, Susan R. Mccouch, Kelly R. Robbins, Adam N. Famoso Sep 2022

Development And Validation Of An Optimized Marker Set For Genomic Selection In Southern U.S. Rice Breeding Programs, Tommaso Cerioli, Christopher O. Hernandez, Brijesh Angira, Susan R. Mccouch, Kelly R. Robbins, Adam N. Famoso

Faculty Publications

The potential of genomic selection (GS) to increase the efficiency of breeding programs has been clearly demonstrated; however, the implementation of GS in rice (Oryza sativa L.) breeding programs has been limited. In recent years, efforts have begun to work toward implementing GS into the Louisiana State University (LSU) Agricultural Center rice breeding program. One of the first steps for successful GS implementation is to establish a suitable marker set for the target germplasm and a reliable, cost-effective genotyping platform capable of providing informative marker data with an adequate turnaround time. The objective of this study was to develop a …

Go to article

The Martian Boulder Automatic Recognition System, Mbars, Don R. Hood, S. F. Sholes, S. Karunatillake, C. I. Fassett, R. C. Ewing, J. Levy Sep 2022

The Martian Boulder Automatic Recognition System, Mbars, Don R. Hood, S. F. Sholes, S. Karunatillake, C. I. Fassett, R. C. Ewing, J. Levy

Faculty Publications

Boulder-sized clasts are common on the surface of Mars, and many are sufficiently large to be resolved by the high resolution imaging science experiment (HiRISE) camera aboard the Mars reconnaissance orbiter. The size, number, and location of boulders on the surface and their spatial distribution can reveal the processes that have operated on the surface, including boulder erosion, burial, impact excavation, and other mechanisms of boulder transport and generation. However, quantitative analysis of statistically significant boulder populations, which could inform these processes, entails prohibitively laborious manual segmentation, granulometry, and morphometry measurements over large areas. Here, we develop, describe, and validate …

Go to article

Rates Of Future Climate Change In The Gulf Of Mexico And The Caribbean Sea: Implications For Coral Reef Ecosystems, A. E. Lawman, S. G. Dee, K. L. Delong, A. M.S. Correa Sep 2022

Rates Of Future Climate Change In The Gulf Of Mexico And The Caribbean Sea: Implications For Coral Reef Ecosystems, A. E. Lawman, S. G. Dee, K. L. Delong, A. M.S. Correa

Faculty Publications

Rising temperatures and ocean acidification due to anthropogenic climate change pose ominous threats to coral reef ecosystems in the Gulf of Mexico (GoM) and the western Caribbean Sea. Unfortunately, the once structurally complex coral reefs in the GoM and Caribbean have dramatically declined since the 1970s; relatively few coral reefs still exhibit a mean live coral cover of >10%. Additional work is needed to characterize future climate stressors on coral reefs in the GoM and the Caribbean Sea. Here, we use climate model simulations spanning the period of 2015–2100 to partition and assess the individual impacts of climate stressors on …

Go to article

Rural-Urban Differences In Breast Cancer Surgical Delays In Medicare Beneficiaries, Ronnie J. Zipkin, Andrew Schaefer, Changzhen Wang, Andrew P. Loehrer, Nirav S. Kapadia, Gabriel A. Brooks, Tracy Onega, Fahui Wang, Alistair J. O’Malley, Erika L. Moen Sep 2022

Rural-Urban Differences In Breast Cancer Surgical Delays In Medicare Beneficiaries, Ronnie J. Zipkin, Andrew Schaefer, Changzhen Wang, Andrew P. Loehrer, Nirav S. Kapadia, Gabriel A. Brooks, Tracy Onega, Fahui Wang, Alistair J. O’Malley, Erika L. Moen

Faculty Publications

Background: Delays between breast cancer diagnosis and surgery are associated with worsened survival. Delays are more common in urban-residing patients, although factors specific to surgical delays among rural and urban patients are not well understood. Methods: We used a 100% sample of fee-for-service Medicare claims during 2007–2014 to identify 238,491 women diagnosed with early-stage breast cancer undergoing initial surgery and assessed whether they experienced biopsy-to-surgery intervals > 90 days. We employed multilevel regression to identify associations between delays and patient, regional, and surgeon characteristics, both in combined analyses and stratified by rurality of patient residence. Results: Delays were more prevalent among …

Go to article

Common Correlated Effects Estimation For Dynamic Heterogeneous Panels With Non-Stationary Multi-Factor Error Structures, Shiyun Cao, Qiankun Zhou Sep 2022

Common Correlated Effects Estimation For Dynamic Heterogeneous Panels With Non-Stationary Multi-Factor Error Structures, Shiyun Cao, Qiankun Zhou

Faculty Publications

In this paper, we consider the estimation of a dynamic panel data model with non-stationary multi-factor error structures. We adopted the common correlated effect (CCE) estimation and established the asymptotic properties of the CCE and common correlated effects mean group (CCEMG) estimators, as N and T tend to infinity. The results show that both the CCE and CCEMG estimators are consistent and the CCEMG estimator is asymptotically normally distributed. The theoretical findings were supported for small samples by an extensive simulation study, showing that the CCE estimators are robust to a wide variety of data generation processes. Empirical findings suggest …

Go to article

First Prev Next Last