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Xact Implementation Of The Theory Of Cosmological Perturbation In Bianchi I Spacetimes, Ivan Agullo, Javier Olmedo, Vijayakumar Sreenath Feb 2020

Xact Implementation Of The Theory Of Cosmological Perturbation In Bianchi I Spacetimes, Ivan Agullo, Javier Olmedo, Vijayakumar Sreenath

Faculty Publications

This paper presents a computational algorithm to derive the theory of linear gauge invariant perturbations on anisotropic cosmological spacetimes of the Bianchi I type. Our code is based on the tensor algebra packages xTensor and xPert, within the computational infrastructure of xAct written in Mathematica. The algorithm is based on a Hamiltonian, or phase space formulation, and it provides an efficient and transparent way of isolating the gauge invariant degrees of freedom in the perturbation fields and to obtain the Hamiltonian generating their dynamics. The restriction to Friedmann-Lemaitre-Robertson-Walker spacetimes is straightforward.

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Human Activities And Climate Variability Affecting Inland Water Surface Area In A High Latitude River Basin, Liwen Chen, Guangxin Zhang, Y. Jun Xu, Shengbo Chen, Yanfeng Wu, Zongting Gao, Haiyang Yu Feb 2020

Human Activities And Climate Variability Affecting Inland Water Surface Area In A High Latitude River Basin, Liwen Chen, Guangxin Zhang, Y. Jun Xu, Shengbo Chen, Yanfeng Wu, Zongting Gao, Haiyang Yu

Faculty Publications

Spatiotemporal changes in the surface area of inland water bodies have important implications in regional water resources, flood control, and drought hazard prediction. Although inland water bodies have been investigated intensively, few studies have looked at the effect of human activities and climate variability on surface area of inland waters at a larger scale over time and space. In this study, we used MODIS (MOD13Q1) images to determine water surface area extent at 250 m spatial resolution. We then applied this algorithm with MOD13Q1 images taken at 16-day intervals from 2000 to 2018 to a large river basin in China's …

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Experimental Forest Fragmentation Alters Amazonian Mixed-Species Flocks, Cameron L. Rutt, Karl Mokross, Michael D. Kaller, Philip C. Stouffer Feb 2020

Experimental Forest Fragmentation Alters Amazonian Mixed-Species Flocks, Cameron L. Rutt, Karl Mokross, Michael D. Kaller, Philip C. Stouffer

Faculty Publications

Habitat fragmentation has been associated with myriad negative effects for forest-dependent birds in the Neotropics. However, the vast majority of negative effects have been inferred from comparisons of pre-existing fragments with separate control sites. Such comparisons confound area loss with isolation and ignore effects of patchy distributions and local habitat heterogeneity. To directly test the effects of fragmentation on Amazonian mixed-species flocks—a complex and diverse species interaction network—we observed birds before and after re-isolation of three 10-ha fragments at the Biological Dynamics of Forest Fragments Project in central Amazonia. Following initial isolation in the 1980s, these fragments have been surrounded …

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Rubusoside-Assisted Solubilization Of Poorly Soluble C6-Ceramide For A Pilot Pharmacokinetic Study, Jianzhong Chen, Sachin K. Khiste, Xiaomei Fu, Kartik R. Roy, Yixuan Dong, Jian Zhang, Mei Liu, Yong Yu Liu, Zhijun Liu Feb 2020

Rubusoside-Assisted Solubilization Of Poorly Soluble C6-Ceramide For A Pilot Pharmacokinetic Study, Jianzhong Chen, Sachin K. Khiste, Xiaomei Fu, Kartik R. Roy, Yixuan Dong, Jian Zhang, Mei Liu, Yong Yu Liu, Zhijun Liu

Faculty Publications

Although C6-Ceramide has attracted much attention as a possible tumor suppressor, the delivery of C6-Ceramide is still challenging due to its inherent hydrophobicity and insolubility. In this study we explored the use of a natural compound rubusoside (RUB) as a solubilizer to enhance the solubility of a fluorescence-labeled C6-Ceramide (NBD C6-Ceramide) and to characterize its pharmacokinetics and tissue distribution in an animal model. RUB significantly enhanced the solubility of NBD C6-Ceramide by forming nanomicelles, and efficiently delivered NBD C6-Ceramide in rats by oral and intravenous administration. RUB loaded 1.96 % of NBD C6-Ceramide in the nanomicelles and solubilized it to …

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Ceramide–Rubusoside Nanomicelles, A Potential Therapeutic Approach To Target Cancers Carrying P53 Missense Mutations, Sachin K. Khiste, Zhijun Liu, Kartik R. Roy, Mohammad B. Uddin, Salman B. Hosain, Xin Gu, Sami Nazzal, Ronald A. Hill, Yong Yu Liu Feb 2020

Ceramide–Rubusoside Nanomicelles, A Potential Therapeutic Approach To Target Cancers Carrying P53 Missense Mutations, Sachin K. Khiste, Zhijun Liu, Kartik R. Roy, Mohammad B. Uddin, Salman B. Hosain, Xin Gu, Sami Nazzal, Ronald A. Hill, Yong Yu Liu

Faculty Publications

Ceramide (Cer) is an active cellular sphingolipid that can induce apoptosis or proliferation-arrest of cancer cells. Nanoparticle-based delivery offers an effective approach for overcoming bioavailability and biopharmaceutics issues attributable to the pronounced hydrophobicity of Cer. Missense mutations of the protein p53, which have been detected in approximately 42% of cancer cases, not only lose the tumor suppression activity of wild-type p53, but also gain oncogenic functions promoting tumor progression and drug resistance. Our previous works showed that cellular Cer can eradicate cancer cells that carry a p53 deletion-mutation by modulating alternative pre-mRNA splicing, restoring wild-type p53 protein expression. Here, we …

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The Response Of Stomatal Conductance To Seasonal Drought In Tropical Forests, Jin Wu, Shawn P. Serbin, Kim S. Ely, Brett T. Wolfe, L. Turin Dickman, Charlotte Grossiord, Sean T. Michaletz, Adam D. Collins, Matteo Detto, Nate G. Mcdowell, S. Joseph Wright, Alistair Rogers Feb 2020

The Response Of Stomatal Conductance To Seasonal Drought In Tropical Forests, Jin Wu, Shawn P. Serbin, Kim S. Ely, Brett T. Wolfe, L. Turin Dickman, Charlotte Grossiord, Sean T. Michaletz, Adam D. Collins, Matteo Detto, Nate G. Mcdowell, S. Joseph Wright, Alistair Rogers

Faculty Publications

Stomata regulate CO2 uptake for photosynthesis and water loss through transpiration. The approaches used to represent stomatal conductance (gs) in models vary. In particular, current understanding of drivers of the variation in a key parameter in those models, the slope parameter (i.e. a measure of intrinsic plant water-use-efficiency), is still limited, particularly in the tropics. Here we collected diurnal measurements of leaf gas exchange and leaf water potential (Ψleaf), and a suite of plant traits from the upper canopy of 15 tropical trees in two contrasting Panamanian forests throughout the dry season of the 2016 El Niño. The plant traits …

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Self-Rated Religiosity/Spirituality And Four Health Outcomes Among Us South Asians: Findings From The Study On Stress, Spirituality, And Health, Samuel Stroope, Blake Victor Kent, Ying Zhang, Namratha R. Kandula, Alka M. Kanaya, Alexandra E. Shields Feb 2020

Self-Rated Religiosity/Spirituality And Four Health Outcomes Among Us South Asians: Findings From The Study On Stress, Spirituality, And Health, Samuel Stroope, Blake Victor Kent, Ying Zhang, Namratha R. Kandula, Alka M. Kanaya, Alexandra E. Shields

Faculty Publications

Almost no research exists on the relationship between religiosity/spirituality (R/S) and health in the US South Asian population. Using data from the joint Study on Stress, Spirituality, and Health and Mediators of Atherosclerosis Among South Asians Living in America Study (MASALA), this article examined associations between self-rated R/S and self-rated health, emotional functioning, trait anxiety, and trait anger in a community-based sample (n = 933) from the Chicago and San Francisco Bay areas. Ordinary least squares regression was used to analyze categorical differences in levels of R/S and ordinal trends for R/S, adjusting for potential confounders. Being slightly or moderately …

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Trans-Disciplinary Responses To Climate Change: Lessons From Rice-Based Systems In Asia, Jon Hellin, Jean Balié, Eleanor Fisher, Ajay Kohli, Melanie Connor, Sudhir Yadav, Virender Kumar, Timothy J. Krupnik, Bjoern Ole Sander, Joshua Cobb, Katherine Nelson, Tri Setiyono, Ranjitha Puskur, Pauline Chivenge, Martin Gummert Feb 2020

Trans-Disciplinary Responses To Climate Change: Lessons From Rice-Based Systems In Asia, Jon Hellin, Jean Balié, Eleanor Fisher, Ajay Kohli, Melanie Connor, Sudhir Yadav, Virender Kumar, Timothy J. Krupnik, Bjoern Ole Sander, Joshua Cobb, Katherine Nelson, Tri Setiyono, Ranjitha Puskur, Pauline Chivenge, Martin Gummert

Faculty Publications

Climate change will continue to have a largely detrimental impact on the agricultural sector worldwide because of predicted rising temperatures, variable rainfall, and an increase in extreme weather events. Reduced crop yields will lead to higher food prices and increased hardship for low income populations, especially in urban areas. Action on climate change is one of the Sustainable Development Goals (SDG 13) and is linked to the Paris Climate Agreement. The research challenge posed by climate change is so complex that a trans-disciplinary response is required, one that brings together researchers, practitioners, and policy-makers in networks where the lines between …

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Strangers In The Neighborhood: Violence And Neighborhood Boundaries, Kevin J. Brown, Frederick D. Weil Feb 2020

Strangers In The Neighborhood: Violence And Neighborhood Boundaries, Kevin J. Brown, Frederick D. Weil

Faculty Publications

New Orleans experienced elevated rates of violent crime throughout the thirty years between 1985 and 2015. Violence was disproportionately represented in socioeconomically disadvantaged communities. This study explores the lived experiences of residents from one such neighborhood, using individual interviews, focus groups, and participant observation. The data indicate that neighborhood boundaries vacillated between rigidly defensive and porous, which impacted residents’ ability to enact collective efficacy and thus to create a milieu that either positively or negatively influenced the likelihood of violence. With a long history of institutional and social neglect, the community initially viewed outsiders as invaders which resulted in rigidly …

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Review Of Broken People, Michael F. Russo Feb 2020

Review Of Broken People, Michael F. Russo

Faculty Publications

No abstract provided.

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Minor Preoccupations, Major Endeavors: The Community Of Poets And Painters, Adelaide M. Russo Feb 2020

Minor Preoccupations, Major Endeavors: The Community Of Poets And Painters, Adelaide M. Russo

Faculty Publications

In Au fond des images (2003), Jean-Luc Nancy introduces concepts about the image, pertinent to understanding the minor genre of poets’ writings on painting. Nancy begins by stating that the image is sacred, clarifying that the sacred should not be confused with the religious, which is based on rituals. The sacred signifies that which is separated, excluded, distanced. The image’s attraction is derived from this, from its untouchable nature. Because of its separation from the viewer, the image inspires a desire for intimacy, and draws the spectator to it. Poets’ texts on painting constitute minor forms: prefaces to catalogs, criticism, …

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Evaluation Of Ultraviolet (Uv-C) Light Treatment For Microbial Inactivation In Agricultural Waters With Different Levels Of Turbidity, Achyut Adhikari, Katheryn J. Parraga Estrada, Vijay S. Chhetri, Marlene Janes, Kathryn Fontenot, John C. Beaulieu Feb 2020

Evaluation Of Ultraviolet (Uv-C) Light Treatment For Microbial Inactivation In Agricultural Waters With Different Levels Of Turbidity, Achyut Adhikari, Katheryn J. Parraga Estrada, Vijay S. Chhetri, Marlene Janes, Kathryn Fontenot, John C. Beaulieu

Faculty Publications

Produce growers using surface or well water to irrigate their crops may require an appropriate water treatment system in place to meet the water quality standard imposed by FSMA Produce Safety Rule. This study evaluated the potential of using ultraviolet (UV-C) treatment in reducing the microbial population in agricultural water. Waters with turbidity levels ranging from 10.93 to 23.32 Nephelometric Turbidity Units (NTU) were prepared by mixing pond water and well water. The waters were inoculated with a cocktail of generic Escherichia coli (ATCC 23716, 25922, and 11775) and then treated with UV-C light (20–60 mJ/cm2). All tested doses of …

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A Cash Flow Model Of An Integrated Industrial Ccs-Eor Project In A Petrochemical Corridor: A Case Study In Louisiana, Brian F. Snyder, Michael Layne, David E. Dismukes Feb 2020

A Cash Flow Model Of An Integrated Industrial Ccs-Eor Project In A Petrochemical Corridor: A Case Study In Louisiana, Brian F. Snyder, Michael Layne, David E. Dismukes

Faculty Publications

Petroleum refineries and petrochemical plants are major CO2 sources, however, they are also significant capital and employment assets that are unlikely to be replaced in the near term. As a result, nations and states that are interested in reducing the carbon intensity of their economies will need to find ways to reduce the emissions of their existing industrial capacity. Industrial carbon capture provides one potential mechanism for reducing the carbon intensity of existing industrial facilities, however, an economically feasible capture system requires that the captured CO2 be integrated into a system of transport and storage with income generated either through …

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Deepsat V2: Feature Augmented Convolutional Neural Nets For Satellite Image Classification, Qun Liu, Saikat Basu, Sangram Ganguly, Supratik Mukhopadhyay, Robert Dibiano, Manohar Karki, Ramakrishna Nemani Feb 2020

Deepsat V2: Feature Augmented Convolutional Neural Nets For Satellite Image Classification, Qun Liu, Saikat Basu, Sangram Ganguly, Supratik Mukhopadhyay, Robert Dibiano, Manohar Karki, Ramakrishna Nemani

Faculty Publications

Satellite image classification is a challenging problem that lies at the crossroads of remote sensing, computer vision, and machine learning. Due to the high variability inherent in satellite data, most of the current object classification approaches are not suitable for handling satellite datasets. The progress of satellite image analytics has also been inhibited by the lack of a single labeled high-resolution dataset with multiple class labels. In a preliminary version of this work, we introduced two new high resolution satellite imagery datasets (SAT-4 and SAT-6) and proposed DeepSat framework for classification based on “handcrafted” features and a deep belief network …

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Plumage Patterns: Ecological Functions, Evolutionary Origins, And Advances In Quantification, Nicholas A. Mason, Rauri C.K. Bowie Feb 2020

Plumage Patterns: Ecological Functions, Evolutionary Origins, And Advances In Quantification, Nicholas A. Mason, Rauri C.K. Bowie

Faculty Publications

Birds exhibit remarkable variation in plumage patterns, both within individual feathers and among plumage patches. Differences in the size, shape, and location of pigments and structural colors comprise important visual signals involved in mate choice, social signaling, camouflage, and many other functions. While ornithologists have studied plumage patterns for centuries, recent technological advances in digital image acquisition and processing have transformed pattern quantification methods, enabling comprehensive, detailed datasets of pattern phenotypes that were heretofore inaccessible. In this review, we synthesize recent and classic studies of plumage patterns at different evolutionary and organismal scales and discuss the various roles that plumage …

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On The Usefulness Of Parental Lines Gwas For Predicting Low Heritability Traits In Tropical Maize Hybrids, Giovanni Galli, Filipe Couto Alves, Júlia Silva Morosini, Roberto Fritsche-Neto Feb 2020

On The Usefulness Of Parental Lines Gwas For Predicting Low Heritability Traits In Tropical Maize Hybrids, Giovanni Galli, Filipe Couto Alves, Júlia Silva Morosini, Roberto Fritsche-Neto

Faculty Publications

Genome-wide association studies (GWAS) is one of the most popular methods of studying the genetic control of traits. This methodology has been intensely performed on inbred genotypes to identify causal variants. Nonetheless, the lack of covariance between the phenotype of inbred lines and their offspring in cross-pollinated species (such as maize) raises questions on the applicability of these findings in a hybrid breeding context. To address this topic, we incorporated previously reported parental lines GWAS information into the prediction of a low heritability trait in hybrids. This was done by marker-assisted selection based on significant markers identified in the lines …

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Fine Structure Of Viral Dsdna Encapsidation, Shawn Walker, Javier Arsuaga, Lindsey Hiltner, M. Carme Calderer, Mariel Vázquez Feb 2020

Fine Structure Of Viral Dsdna Encapsidation, Shawn Walker, Javier Arsuaga, Lindsey Hiltner, M. Carme Calderer, Mariel Vázquez

Faculty Publications

Unraveling the mechanisms of packing of DNA inside viral capsids is of fundamental importance to understanding the spread of viruses. It could also help develop new applications to targeted drug delivery devices for a large range of therapies. In this article, we present a robust, predictive mathematical model and its numerical implementation to aid the study and design of bacteriophage viruses for application purposes. Exploiting the analogies between the columnar hexagonal chromonic phases of encapsidated viral DNA and chromonic aggregates formed by plank-shaped molecular compounds, we develop a first-principles effective mechanical model of DNA packing in a viral capsid. The …

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Agricultural And Finance Intervention Increased Dietary Intake And Weight Of Children Living In Hiv-Affected Households In Western Kenya, Lisa M. Butler, Shiva Bhandari, Phelgona Otieno, Sheri D. Weiser, Craig R. Cohen, Edward A. Frongillo Jr. Feb 2020

Agricultural And Finance Intervention Increased Dietary Intake And Weight Of Children Living In Hiv-Affected Households In Western Kenya, Lisa M. Butler, Shiva Bhandari, Phelgona Otieno, Sheri D. Weiser, Craig R. Cohen, Edward A. Frongillo Jr.

Faculty Publications

We tested whether a multisectoral household agricultural and finance intervention increased the dietary intake and improved the nutritional status of HIV-affected children. Two hospitals in rural Kenya were randomly assigned to be either the intervention or the control arm. The intervention comprised a human-powered water pump, microfinance loan for farm commodities, and training in sustainable farming practices and financial management. In each arm, 100 children (0-59 mo of age) were enrolled from households with HIV-infected adults 18-49 y old. Children were assessed beginning in April 2012 and every 3 mo for 1 y for dietary intake and anthropometry. Children in …

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Community Sentiment Following The Deepwater Horizon Oil Spill Disaster: A Test Of Time, Systemic Community, And Corrosive Community Models, Michael R. Cope, Tim Slack, Jorden E. Jackson, Vanessa Parks Feb 2020

Community Sentiment Following The Deepwater Horizon Oil Spill Disaster: A Test Of Time, Systemic Community, And Corrosive Community Models, Michael R. Cope, Tim Slack, Jorden E. Jackson, Vanessa Parks

Faculty Publications

A fundamental concern in the social science scholarship on disasters is understanding community impacts and recovery as a social process. This study examines community sentiment in the aftermath 2010 BP Deepwater Horizon oil spill (DHOS), including the influence of time and the explanatory utility of two major theoretical perspectives—the systemic community model and the corrosive community model—in predicting community sentiment in the context of this disaster. Specifically, our objectives are to assess how community sentiment in the wake of the DHOS: 1) changes over time; 2) is related to the systemic model; and 3) is related to the corrosive model. …

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Energetic And Environmental Constraints On The Community Structure Of Benthic Microbial Mats In Lake Fryxell, Antarctica, Megan L. Dillon, Ian Hawes, Anne D. Jungblut, Tyler J. Mackey, Jonathan A. Eisen, Peter T. Doran, Dawn Y. Sumner Feb 2020

Energetic And Environmental Constraints On The Community Structure Of Benthic Microbial Mats In Lake Fryxell, Antarctica, Megan L. Dillon, Ian Hawes, Anne D. Jungblut, Tyler J. Mackey, Jonathan A. Eisen, Peter T. Doran, Dawn Y. Sumner

Faculty Publications

© 2020 FEMS 2020. Ecological communities are regulated by the flow of energy through environments. Energy flow is typically limited by access to photosynthetically active radiation (PAR) and oxygen concentration (O2). The microbial mats growing on the bottom of Lake Fryxell, Antarctica, have well-defined environmental gradients in PAR and (O2). We analyzed the metagenomes of layers from these microbial mats to test the extent to which access to oxygen and light controls community structure. We found variation in the diversity and relative abundances of Archaea, Bacteria and Eukaryotes across three (O2) and PAR conditions: high (O2) and maximum PAR, variable …

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Improving Construction Work Zone Safety Using Technology: A Systematic Review Of Applicable Technologies, Chukwuma Nnaji, John Gambatese, Hyun Woo Lee, Fan Zhang Feb 2020

Improving Construction Work Zone Safety Using Technology: A Systematic Review Of Applicable Technologies, Chukwuma Nnaji, John Gambatese, Hyun Woo Lee, Fan Zhang

Faculty Publications

© 2019 The Authors Once considered conventional, the construction industry is gradually increasing its reliance on innovations such as the application of technologies in safety management. Given the growing literature on technology applications in safety management and the varying opinions on the utility of applied technologies, a systematic review that streamlines findings from past studies is indispensable to construction stakeholders. Although a number of review studies are available in the building construction sector, the level of fragmentation and uniqueness within the construction industry necessitates a review study specifically targeting the heavy civil sector. In response, the present study applies a …

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230Th Normalization: New Insights On An Essential Tool For Quantifying Sedimentary Fluxes In The Modern And Quaternary Ocean, Kassandra M. Costa, Christopher T. Hayes, Robert F. Anderson, Frank J. Pavia, Alexandra Bausch, Feifei Deng, Jean Claude Dutay, Walter Geibert, Christoph Heinze, Gideon Henderson, Claude Hillaire-Marcel, Sharon Hoffmann, Samuel L. Jaccard, Allison W. Jacobel, Stephanie S. Kienast, Lauren Kipp, Paul Lerner, Jörg Lippold, David Lund, Franco Marcantonio, David Mcgee, Jerry F. Mcmanus, Figen Mekik, Jennifer L. Middleton, Lise Missiaen, Christelle Not, Sylvain Pichat, Laura F. Robinson, George H. Rowland, Matthieu Roy-Barman, Alessandro Tagliabue, Adi Torfstein, Gisela Winckler, Yuxin Zhou Feb 2020

230Th Normalization: New Insights On An Essential Tool For Quantifying Sedimentary Fluxes In The Modern And Quaternary Ocean, Kassandra M. Costa, Christopher T. Hayes, Robert F. Anderson, Frank J. Pavia, Alexandra Bausch, Feifei Deng, Jean Claude Dutay, Walter Geibert, Christoph Heinze, Gideon Henderson, Claude Hillaire-Marcel, Sharon Hoffmann, Samuel L. Jaccard, Allison W. Jacobel, Stephanie S. Kienast, Lauren Kipp, Paul Lerner, Jörg Lippold, David Lund, Franco Marcantonio, David Mcgee, Jerry F. Mcmanus, Figen Mekik, Jennifer L. Middleton, Lise Missiaen, Christelle Not, Sylvain Pichat, Laura F. Robinson, George H. Rowland, Matthieu Roy-Barman, Alessandro Tagliabue, Adi Torfstein, Gisela Winckler, Yuxin Zhou

Faculty Publications

230Th normalization is a valuable paleoceanographic tool for reconstructing high‐resolution sediment fluxes during the late Pleistocene (last ~500,000 years). As its application has expanded to ever more diverse marine environments, the nuances of 230Th systematics, with regard to particle type, particle size, lateral advective/diffusive redistribution, and other processes, have emerged. We synthesized over 1000 sedimentary records of 230Th from across the global ocean at two time slices, the late Holocene (0–5,000 years ago, or 0–5 ka) and the Last Glacial Maximum (18.5–23.5 ka), and investigated the spatial structure of 230Th‐normalized mass fluxes. On a global scale, …

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Experimental Determination Of The Role Of Increased Surface Area In Pool Boiling From Nanostructured Surfaces, Brendon Doran, Bin Zhang, Abigail Walker, Pratik Kc, W. J. Meng, Arden L. Moore Feb 2020

Experimental Determination Of The Role Of Increased Surface Area In Pool Boiling From Nanostructured Surfaces, Brendon Doran, Bin Zhang, Abigail Walker, Pratik Kc, W. J. Meng, Arden L. Moore

Faculty Publications

The use of nanostructured surfaces to enhance pool boiling heat transfer performance has previously been demonstrated for a variety of outwardly-projecting nanostructures such as nanowires and nanotubes. Such enhancement has been attributed to a variety of factors, including greater surface area, improved wickability, and superior nucleation site density as compared to unmodified surfaces. However, since these three phenomena are inherently interlinked with the presence of the nanostructures, isolating each one for independent study to truly understand its relative importance in enhancing pool boiling heat transfer has remained a challenge. In this work, nanoporous anodized aluminum oxide (AAO) films on metallic …

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Effect Of Alloying Elements On The Γ’ Antiphase Boundary Energy In Ni-Base Superalloys, M. Dodaran, A. Hemmasian Ettefagh, S. M. Guo, M. M. Khonsari, W. J. Meng, N. Shamsaei, S. Shao Feb 2020

Effect Of Alloying Elements On The Γ’ Antiphase Boundary Energy In Ni-Base Superalloys, M. Dodaran, A. Hemmasian Ettefagh, S. M. Guo, M. M. Khonsari, W. J. Meng, N. Shamsaei, S. Shao

Faculty Publications

Mechanical and fatigue performance of γ-γ′ Ni-base superalloys are strongly affected by the antiphase boundary energy (APBE) of the γ′ precipitates which, in turn, is dictated by the alloy's composition. Due to the multicomponent character of these alloys, establishing composition-APBE relationships are challenging, even though the qualitative effect of individual solutes on the APBE may be known. This work attempts to utilize density functional theory-based cluster expansion calculations to systematically assess the effect of composition on the APBE of the γ′ phases in Ni-base superalloys. We aim to elucidate the influence of not only one single element but also multiple …

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Investigation Of Microwave-Assisted Pyrolysis Of Biomass With Char In A Rectangular Waveguide Applicator With Built-In Phase-Shifting, Candice Raffaela Ellison, Ryan Hoff, Cosmin Mărculescu, Dorin Boldor Feb 2020

Investigation Of Microwave-Assisted Pyrolysis Of Biomass With Char In A Rectangular Waveguide Applicator With Built-In Phase-Shifting, Candice Raffaela Ellison, Ryan Hoff, Cosmin Mărculescu, Dorin Boldor

Faculty Publications

Fast biomass pyrolysis is a promising technique for thermochemical conversion of biomass into chemicals and biofuels (bio-oil and syngas). Microwave heating can increase process efficiency. The effect of microwave absorber and microwave power level are studied for their effect on pyrolysis process temperature, product yields, and product composition. A novel microwave system was designed with a continuous sliding short enabling phase shifting to mitigate standing wave effects in the low loss load. Pyrolysis experiments on pine sawdust were carried out at varying microwave input powers (600, 900, 1200, and 1500 W) and with varying amounts of biochar added to the …

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Hydromechanical Modelling To Evaluate Impact Of Fault Structure On Co2 Migration In Stacked Storage System, Muhammad Zulqarnain, Mehdi Zeidouni, Richard G. Hughes Feb 2020

Hydromechanical Modelling To Evaluate Impact Of Fault Structure On Co2 Migration In Stacked Storage System, Muhammad Zulqarnain, Mehdi Zeidouni, Richard G. Hughes

Faculty Publications

Faulting processes produce a complex fault damage zone (FDZ) having permeability variations over several orders of magnitude within a very short distance. In this study we use an example normal fault system from a depleted oil field in southern Louisiana with multiple stacked sand beds along the fault structure. Geostatistical techniques are used to introduce heterogeneities of several orders of magnitude over very short distances that honor the across- and along-fault architecture of the system. A total of 15 cases are simulated to account for the impact of a fragmented core, an intact core and a naturally fractured core on …

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An Ultra-Sparse Approximation Of Kinetic Solutions To Spatially Homogeneous Flows Of Non-Continuum Gas, Alexander Alekseenko, Amy Grandilli, Aihua W. Wood Feb 2020

An Ultra-Sparse Approximation Of Kinetic Solutions To Spatially Homogeneous Flows Of Non-Continuum Gas, Alexander Alekseenko, Amy Grandilli, Aihua W. Wood

Faculty Publications

We consider a compact approximation of the kinetic velocity distribution function by a sum of isotropic Gaussian densities in the problem of spatially homogeneous relaxation. Derivatives of the macroscopic parameters of the approximating Gaussians are obtained as solutions to a linear least squares problem derived from the Boltzmann equation with full collision integral. Our model performs well for flows obtained by mixing upstream and downstream conditions of normal shock wave with Mach number 3. The model was applied to explore the process of approaching equilibrium in a spatially homogeneous flow of gas. Convergence of solutions with respect to the model …

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Harmonic Equiangular Tight Frames Comprised Of Regular Simplices, Matthew C. Fickus, Courtney A. Schmitt Feb 2020

Harmonic Equiangular Tight Frames Comprised Of Regular Simplices, Matthew C. Fickus, Courtney A. Schmitt

Faculty Publications

An equiangular tight frame (ETF) is a sequence of unit-norm vectors in a Euclidean space whose coherence achieves equality in the Welch bound, and thus yields an optimal packing in a projective space. A regular simplex is a simple type of ETF in which the number of vectors is one more than the dimension of the underlying space. More sophisticated examples include harmonic ETFs which equate to difference sets in finite abelian groups. Recently, it was shown that some harmonic ETFs are comprised of regular simplices. In this paper, we continue the investigation into these special harmonic ETFs. We begin …

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A Sequential Partial Information Bomber‐Defender Shooting Problem, Krishna Kalyanam, David W. Casbeer, Meir Pachter Feb 2020

A Sequential Partial Information Bomber‐Defender Shooting Problem, Krishna Kalyanam, David W. Casbeer, Meir Pachter

Faculty Publications

No abstract provided.

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Metrics To Meet Security & Privacy Requirements With Agile Software Development Methods In A Regulated Environment, Torrey J. Wagner, Thomas C. Ford Feb 2020

Metrics To Meet Security & Privacy Requirements With Agile Software Development Methods In A Regulated Environment, Torrey J. Wagner, Thomas C. Ford

Faculty Publications

This work examines metrics that can be used to measure the ability of agile software development methods to meet security and privacy requirements of communications applications. Many implementations of communication protocols, including those in vehicular networks, occur within regulated environments where agile development methods are traditionally discouraged. We propose a framework and metrics to measure adherence to security, quality and software effectiveness regulations if developers desire the cost and schedule benefits of agile methods. After providing an overview of specific challenges that a regulated environment imposes on communications software development, we proceed to examine the 12 agile principles and how …

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