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A Hybrid Kinematic-Acoustic System For Automated Activity Detection Of Construction Equipment, Yong-Cheol Lee Oct 2019

A Hybrid Kinematic-Acoustic System For Automated Activity Detection Of Construction Equipment, Yong-Cheol Lee

Faculty Publications

Automatically recognizing and tracking construction equipment activities is the first step towards performance monitoring of a job site. Recognizing equipment activities helps construction managers to detect the equipment downtime/idle time in a real-time framework, estimate the productivity rate of each equipment based on its progress, and efficiently evaluate the cycle time of each activity. Thus, it leads to project cost reduction and time schedule improvement. Previous studies on this topic have been based on single sources of data (e.g., kinematic, audio, video signals) for automated activity-detection purposes. However, relying on only one source of data is not appropriate, as the …

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Hinge Region In Dna Packaging Terminase Pul15 Of Herpes Simplex Virus: A Potential Allosteric Target For Antiviral Drugs, Lana F. Thaljeh, J. Ainsley Rothschild, Misagh Naderi, Lyndon M. Coghill Oct 2019

Hinge Region In Dna Packaging Terminase Pul15 Of Herpes Simplex Virus: A Potential Allosteric Target For Antiviral Drugs, Lana F. Thaljeh, J. Ainsley Rothschild, Misagh Naderi, Lyndon M. Coghill

Faculty Publications

Approximately 80% of adults are infected with a member of the herpesviridae family. Herpesviruses establish life-long latent infections within neurons, which may reactivate into lytic infections due to stress or immune suppression. There are nine human herpesviruses (HHV) posing health concerns from benign conditions to life threatening encephalitis, including cancers associated with viral infections. The current treatment options for most HHV conditions mainly include several nucleoside and nucleotide analogs targeting viral DNA polymerase. Although these drugs help manage infections, their common mechanism of action may lead to the development of drug resistance, which is particularly devastating in immunocompromised patients. Therefore, …

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Intensive Livestock Production Causing Antibiotic Pollution In The Yinma River Of Northeast China, Hanyu Ju, Sijia Li, Y. Jun Xu, Guangxin Zhang, Jiquan Zhang Oct 2019

Intensive Livestock Production Causing Antibiotic Pollution In The Yinma River Of Northeast China, Hanyu Ju, Sijia Li, Y. Jun Xu, Guangxin Zhang, Jiquan Zhang

Faculty Publications

Antibiotics are increasingly used in livestock production in rural China, raising concerns over pollution and health risk in countryside waterways. The Yinma River Basin in China's far northeast is an agriculture-dominated area mixed with a densely populated province capitol city, providing a suitable area for investigating the influence of a typical land use mix in Northeast China on riverine antibiotic levels and transport. In this study, we sampled water along the Yinma River from upstream to downstream in a wet and a dry season and analyzed the samples for two popularly used antibiotics, ciprofloxacin (CIP) and norfloxacin (NOR). The goal …

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Response Of Water Resources To Future Climate Change In A High-Latitude River Basin, Peng Qi, Guangxin Zhang, Yi Jun Xu, Zhikun Xia, Ming Wang Oct 2019

Response Of Water Resources To Future Climate Change In A High-Latitude River Basin, Peng Qi, Guangxin Zhang, Yi Jun Xu, Zhikun Xia, Ming Wang

Faculty Publications

Global water resources are affected by climate change as never before. However, it is still unclear how water resources in high latitudes respond to climate change. In this study, the water resource data for 2021-2050 in the Naoli River Basin, a high-latitude basin in China, are calculated by using the SWAT-Modflow Model and future climate scenarios RCP4.5 and RCP8.5. The results show a decreasing trend. When compared to the present, future streamflow is predicted to decrease by 2.73 × 108 m3 in 2021-2035 and by 1.51 × 108 m3 in 2036-2050 in the RCP4.5 scenario, and by 8.16 × 108 …

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Dam Effects On Downstream Riparian Wetlands: The Nenjiang River, Northeast China, Yuexin Zheng, Guangxin Zhang, Yanfeng Wu, Y. Jun Xu, Changlei Dai Oct 2019

Dam Effects On Downstream Riparian Wetlands: The Nenjiang River, Northeast China, Yuexin Zheng, Guangxin Zhang, Yanfeng Wu, Y. Jun Xu, Changlei Dai

Faculty Publications

Many studies have found that damming a river can change downstream hydrology, sediment transport, channel morphology, and fish habitat. However, little is known about river dam effects on downstream riparian wetland dynamics and their quantitative relationship with hydrological alterations. In this study, hydrological time series and wetland distribution data spanning nearly 40 years (1978-2016) before and after the construction of a large dam in 2005 across the Nenjiang River in Northeast China were used to reveal the impact of dam on the downstream discharge regime and wetland degradation. Hydro-statistical and stepwise multiple regression analyses were performed to quantify the relationship …

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Quantifying Soil Health In A Topographically Diverse Warm-Season Perennial Pasture Over-Seeded With A Mix Of Cool-Season Annuals, Kathleen M. Bridges, Lisa M. Fultz, Montgomery W. Alison, Kun Jun Han, Bisoondat Macoon, William D. Pitman Oct 2019

Quantifying Soil Health In A Topographically Diverse Warm-Season Perennial Pasture Over-Seeded With A Mix Of Cool-Season Annuals, Kathleen M. Bridges, Lisa M. Fultz, Montgomery W. Alison, Kun Jun Han, Bisoondat Macoon, William D. Pitman

Faculty Publications

Over-seeding cool-season annual forages in pastures in the southeastern US provides increased grazing opportunities for livestock and reduces the amount of hay needed during winter. The constant presence of vegetation can benefit soil health, the biological aspect of which has only received cursory investigation to date. Since 2009, a commercial cattle grazing operation located in south Mississippi has been over-seeding a diverse mixture of oats (Avena sativa L.), triticale (X Triticosecale Wittmack), annual ryegrass (Lolium multiflorum Lam.), hairy vetch (Vicia villosa Roth), radish (Raphanus sativus L.), turnips (Brassica rapa L. subsp. rapa), red clover (Trifolium pratense L.), ball clover (Trifolium …

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Relative Resistance To Breaking Of Pinus Taeda And Pinus Palustris, Cory Garms, Thomas J. Dean Oct 2019

Relative Resistance To Breaking Of Pinus Taeda And Pinus Palustris, Cory Garms, Thomas J. Dean

Faculty Publications

Patterns from hurricane damage indicate that longleaf pine is more windfirm than loblolly pine. Tree windfirmess has been attributed to many factors including species and material properties like wood strength and stiffness. Because longleaf pine wood is stronger and stiffer than loblolly pine wood, this study used static winching methodology to see if these properties account for differences in wind firmness by measuring bending force required to break stems (MMAX). Stress-strain diagrams were constructed for pulled trees to explore how they behave under increasing loads. Based on these diagrams, living trees appear to act as linear elastic materials as they …

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On-Site Capabilities Of A Mobile Laboratory For Aquatic Germplasm Cryopreservation, William M. Childress, Brian Bosworth, Edward Chesney, Ronald B. Walter, Terrence R. Tiersch Oct 2019

On-Site Capabilities Of A Mobile Laboratory For Aquatic Germplasm Cryopreservation, William M. Childress, Brian Bosworth, Edward Chesney, Ronald B. Walter, Terrence R. Tiersch

Faculty Publications

The cryopreservation of genetic material can be an important tool for researchers and others involved with imperiled fishes, wild fisheries, aquaculture, and biomedical research. The standardization and reliable collection of diverse, high-quality samples are persistent challenges to the successful cryopreservation of aquatic species. The overall goal of this study was to work with different user groups, cryopreserving sperm on-site at their facilities to evaluate the uses and challenges of a mobile laboratory with high-throughput and quality control capabilities comparable to those of a specialized central facility. The objectives were to demonstrate the collection and cryopreservation of sperm from (1) large-bodied …

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Leaf Reflectance Spectroscopy Captures Variation In Carboxylation Capacity Across Species, Canopy Environment And Leaf Age In Lowland Moist Tropical Forests, Jin Wu, Alistair Rogers, Loren P. Albert, Kim Ely, Neill Prohaska, Brett T. Wolfe, Raimundo Cosme Oliveira, Scott R. Saleska, Shawn P. Serbin Oct 2019

Leaf Reflectance Spectroscopy Captures Variation In Carboxylation Capacity Across Species, Canopy Environment And Leaf Age In Lowland Moist Tropical Forests, Jin Wu, Alistair Rogers, Loren P. Albert, Kim Ely, Neill Prohaska, Brett T. Wolfe, Raimundo Cosme Oliveira, Scott R. Saleska, Shawn P. Serbin

Faculty Publications

Understanding the pronounced seasonal and spatial variation in leaf carboxylation capacity (Vc,max) is critical for determining terrestrial carbon cycling in tropical forests. However, an efficient and scalable approach for predicting Vc,max is still lacking. Here the ability of leaf spectroscopy for rapid estimation of Vc,max was tested. Vc,max was estimated using traditional gas exchange methods, and measured reflectance spectra and leaf age in leaves sampled from tropical forests in Panama and Brazil. These data were used to build a model to predict Vc,max from leaf spectra. The results demonstrated that leaf spectroscopy accurately predicts Vc,max of mature leaves in Panamanian …

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Climate And Plant Trait Strategies Determine Tree Carbon Allocation To Leaves And Mediate Future Forest Productivity, Anna T. Trugman, Leander D.L. Anderegg, Brett T. Wolfe, Benjamin Birami, Nadine K. Ruehr, Matteo Detto, Megan K. Bartlett, William R.L. Anderegg Oct 2019

Climate And Plant Trait Strategies Determine Tree Carbon Allocation To Leaves And Mediate Future Forest Productivity, Anna T. Trugman, Leander D.L. Anderegg, Brett T. Wolfe, Benjamin Birami, Nadine K. Ruehr, Matteo Detto, Megan K. Bartlett, William R.L. Anderegg

Faculty Publications

Forest leaf area has enormous leverage on the carbon cycle because it mediates both forest productivity and resilience to climate extremes. Despite widespread evidence that trees are capable of adjusting to changes in environment across both space and time through modifying carbon allocation to leaves, many vegetation models use fixed carbon allocation schemes independent of environment, which introduces large uncertainties into predictions of future forest responses to atmospheric CO2 fertilization and anthropogenic climate change. Here, we develop an optimization-based model, whereby tree carbon allocation to leaves is an emergent property of environment and plant hydraulic traits. Using a combination of …

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Isolation And Characterization Of Cdna Clones Encoding A Novel Subfamily Sporamin B In Sweet Potato, Jollanda Effendy, Don R. Labonte, Darda Efendi Oct 2019

Isolation And Characterization Of Cdna Clones Encoding A Novel Subfamily Sporamin B In Sweet Potato, Jollanda Effendy, Don R. Labonte, Darda Efendi

Faculty Publications

Three cDNAs (IbH23, IbH41, and IbH74) encoding sporamin of sweet potato, were isolated from a skinning injury cDNA library. The open reading frame consisted of 288 nucleotides and the deduced polypeptide sequences consist of 96 amino acids with missing 127 amino acid residues at 5′. The sequences shared identity [42-62% (IbH23 and IbH41) and 40-61% (IbH74)] to sporamins A and B previously identified in other sweet potato species. The IbSpors contained three of four signature cysteine residues of sporamin family (Cys135, Cys198, Cys209). In addition to similarity to sporamins, these cDNA clones also showed similarities to miraculin (29-35%); Kunitz trypsin …

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Postbreeding Habitat Use By Golden-Cheeked Warblers (Setophaga Chrysoparia), Melanie R. Colón, Mark R. Hutchinson, Ashley M. Long, Gary Voelker, Michael L. Morrison Oct 2019

Postbreeding Habitat Use By Golden-Cheeked Warblers (Setophaga Chrysoparia), Melanie R. Colón, Mark R. Hutchinson, Ashley M. Long, Gary Voelker, Michael L. Morrison

Faculty Publications

The period following breeding but prior to migration is an important, though understudied, component of the avian annual life cycle. We quantified habitat use by endangered Golden-cheeked Warblers (Setophaga chrysoparia) during the postbreeding period in Golden-cheeked Warbler breeding habitat (i.e., oak-juniper [Quercus-Juniperus] woodlands) predominated by Texas oak (Quercus buckleyi) or post oak (Q. stellata), as well as in immediately adjacent oak woodland, oak savanna, and riparian vegetation not usually associated with breeding activity for this species. Most (87%) of the Golden-cheeked Warblers we detected were in oak-juniper woodlands, especially in Texas oak sites, but we also detected warblers in each …

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Effectiveness Of Daily Rinsing Of Alfalfa Sprouts With Aqueous Chlorine Dioxide And Ozonated Water On The Growth Of Listeria Monocytogenes During Sprouting, A. Adhikari, V. S. Chhetri, D. Bhattacharya, C. Cason, P. Luu, A. Suazo Oct 2019

Effectiveness Of Daily Rinsing Of Alfalfa Sprouts With Aqueous Chlorine Dioxide And Ozonated Water On The Growth Of Listeria Monocytogenes During Sprouting, A. Adhikari, V. S. Chhetri, D. Bhattacharya, C. Cason, P. Luu, A. Suazo

Faculty Publications

Alfalfa sprouts have been implicated in multiple foodborne disease outbreaks. This study evaluated the growth of Listeria monocytogenes during sprouting of alfalfa seeds and the effectiveness of daily chlorine dioxide & ozone rinsing in controlling the growth. Alfalfa seeds inoculated with L. monocytogenes were sprouted for 5 days (25°C) with a daily aqueous ClO2 (3 ppm, 10 min) or ozone water (2 ppm, 5 min) rinse. Neither treatment significantly reduced the growth of L. monocytogenes on sprouting alfalfa seeds. The initial level of L. monocytogenes was 3·44 ± 0·27, which increased to c. 7·0 log CFU per g following 3 …

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Effects Of Five Years’ Nitrogen Deposition On Soil Properties And Plant Growth In A Salinized Reed Wetland Of The Yellow River Delta, Bo Guan, Baohua Xie, Shanshan Yang, A. Hou, Min Chen, Guangxuan Han Oct 2019

Effects Of Five Years’ Nitrogen Deposition On Soil Properties And Plant Growth In A Salinized Reed Wetland Of The Yellow River Delta, Bo Guan, Baohua Xie, Shanshan Yang, A. Hou, Min Chen, Guangxuan Han

Faculty Publications

Atmospheric nitrogen (N) deposition caused by human activities has been shown to have significant impacts on ecosystem structure and function, but the reported impacts have been inconsistent among studies. To test the effects of N deposition on a salinized reed wetland, we built a long-term nitrogen deposition experimental platform in the Yellow River Delta (YRD), China. The present study investigated soil chemical properties, soil enzyme activities and plant growth parameters after five years of N deposition. Results showed that the concentration of NH4-N and NO3-N increased significantly with the increasing level of nitrogen addition, but no significant influences were observed …

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Microfluidic Isolation Of Tumor Cells Or Other Rare Cells From Whole Blood Or Other Liquids, Steve A. Soper, Michael C. Murphy, June Feng, Robin L. Mccarley, Andre A. Adams Oct 2019

Microfluidic Isolation Of Tumor Cells Or Other Rare Cells From Whole Blood Or Other Liquids, Steve A. Soper, Michael C. Murphy, June Feng, Robin L. Mccarley, Andre A. Adams

College of Science Patents

Microdevices are disclosed to efficiently, accurately, and rapidly isolate and enumerate rare cells, such as circulating tumor cells, from liquids such as whole blood. The system employs multiple parallel meandering channels having a width on the order of 1-2 cell diameters. The microdevices can be produced at low-cost, may readily be automated, and in many instances may be used without pre-processing of the sample. They may be used to isolate and enumerate rare cells, including for example the detection and diagnosis of cancers, cancer staging, or evaluating the effectiveness of a therapeutic intervention, or detecting pathogenic bacteria. The device may …

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Wetland Biomass And Productivity In Coastal Louisiana: Base Line Data (1976-2015) And Knowledge Gaps For The Development Of Spatially Explicit Models For Ecosystem Restoration And Rehabilitation Initiatives, Victor H. Rivera-Monroy, Courtney Elliton, Siddhartha Narra, Ehab Meselhe, Xiaochen Zhao, Eric White, Charles E. Sasser, Jenneke M. Visser, Xuelian Meng, Hongqing Wang, Zuo Xue, Fernando Jaramillo Oct 2019

Wetland Biomass And Productivity In Coastal Louisiana: Base Line Data (1976-2015) And Knowledge Gaps For The Development Of Spatially Explicit Models For Ecosystem Restoration And Rehabilitation Initiatives, Victor H. Rivera-Monroy, Courtney Elliton, Siddhartha Narra, Ehab Meselhe, Xiaochen Zhao, Eric White, Charles E. Sasser, Jenneke M. Visser, Xuelian Meng, Hongqing Wang, Zuo Xue, Fernando Jaramillo

Faculty Publications

Coastal Louisiana hosts 37% of the coastal wetland area in the conterminous US, including one of the deltaic coastal regions more susceptible to the synergy of human and natural impacts causing wetland loss. As a result of the construction of flood protection infrastructure, dredging of channels across wetlands for oil/gas exploration and maritime transport activities, coastal Louisiana has lost approximately 4900 km2 of wetland area since the early 1930s. Despite the economic relevance of both wetland biomass and net primary productivity (NPP) as ecosystem services, there is a lack of vegetation simulation models to forecast the trends of those functional …

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F19rs Sgb No. 1 (Bylaws Regarding Exec And Senate), Menon Oct 2019

F19rs Sgb No. 1 (Bylaws Regarding Exec And Senate), Menon

Student Senate Enrolled Legislation

To amend the LSU Student Government Bylaws regarding executive staff and senatorial responsibilities

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F19rs Sgb No. 2 (Order For Senators As Parliamentarian In Case Of Vacancy), Grashoff Oct 2019

F19rs Sgb No. 2 (Order For Senators As Parliamentarian In Case Of Vacancy), Grashoff

Student Senate Enrolled Legislation

To amend the Student Senate Rules of Order to allow Senators to Serve as Parliamentarian in the Case of a Vacancy in the Position.

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An Integrated Approach For Constraining Depositional Zones In A Tide-Influenced River: Insights From The Gorai River, Southwest Bangladesh, Edwin J. Bomer, Carol A. Wilson, Dilip K. Datta Oct 2019

An Integrated Approach For Constraining Depositional Zones In A Tide-Influenced River: Insights From The Gorai River, Southwest Bangladesh, Edwin J. Bomer, Carol A. Wilson, Dilip K. Datta

Faculty Publications

The tidal to fluvial transition (TFT) of estuaries and coastal rivers is one of the most complex environments on Earth with respect to the transportation and deposition of sediment, owing in large part to competing fluvial and marine processes. While there have been recent advances in the stratigraphic understanding of the TFT, it is still unclear whether these findings are site-specific or representative of mixed tidal-fluvial systems worldwide. Yet, research from this depositional domain holds profound societal and economic importance. For instance, understanding the underlying stratigraphic architecture of channel margins is critical for assessing geomorphic change for fluvio-deltaic settings, which …

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Detecting Dna Methylation Using Surface-Enhanced Raman Spectroscopy, Syed Mohammad Abid Hasan, Yuyang He, Te Wei Chang, Jianwei Wang, Manas Ranjan Gartia Oct 2019

Detecting Dna Methylation Using Surface-Enhanced Raman Spectroscopy, Syed Mohammad Abid Hasan, Yuyang He, Te Wei Chang, Jianwei Wang, Manas Ranjan Gartia

Faculty Publications

Copyright © 2018 American Chemical Society. Among all of the epigenetic events that are responsible for various diseases such as cancer, lupus, and several birth defects, DNA methylation is one of the crucial ones. It occurs because of the alkylation of various bases. These modifications of genes carried through altered creations of proteins ultimately lead to various diseases. For example, a vital cause behind canine lymphoma is found to be DNA methylation in the guanine base. In this work, we analyzed the methylated and nonmethylated guanine structure with the assistance of surface-enhanced Raman spectroscopy and density functional theory (DFT). Because …

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Synthesis Of Samarium-Based Metal Organic Compound Nanoparticles With Polychromatic-Photoluminescence For Bio-Tissue Fluorescence Imaging, Jian Xu Oct 2019

Synthesis Of Samarium-Based Metal Organic Compound Nanoparticles With Polychromatic-Photoluminescence For Bio-Tissue Fluorescence Imaging, Jian Xu

Faculty Publications

The development of nanomaterials with special optical window is critical for clinical applications and the optoelectronic industry. In this work, eight kinds of samarium-based metal organic compound nanoparticles (Sm-Fe, Sm-Ga, Sm-Mn, Sm-Na, Sm-Nb, Sm-W, Sm-Cu, and Sm-Al) were synthesized through a solution method. They show polychromatic-photoluminescence spectra extended from the UV to near-infrared (NIR) region when excited by 280 nm, 380 nm, 480 nm, 580 nm, and 785 nm light. They emit direct white light with respect to UV excitation. Tunable white-to-green fluorescence can be achieved by variation of excitation light around 300-400 nm. When they are excited by a …

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Overview: Additive Manufacturing Enabled Accelerated Design Of Ni-Based Alloys For Improved Fatigue Life, S. Shao, M. M. Khonsari, S. Guo, W. J. Meng, N. Li Oct 2019

Overview: Additive Manufacturing Enabled Accelerated Design Of Ni-Based Alloys For Improved Fatigue Life, S. Shao, M. M. Khonsari, S. Guo, W. J. Meng, N. Li

Faculty Publications

An in-depth overview on an emerging area of the additive-manufacturing-enabled, accelerated design of Ni-based alloys for improved high-cycle and very-high-cycle fatigue life is presented. Existing literature on the subject is critically reviewed, and key knowledge gaps are identified. An efficient life-cycle approach, integrating the model-make-measure-verify strategy in the design of these alloys is introduced and discussed.

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Recent Progress On Zinc-Ion Rechargeable Batteries, Wangwang Xu, Ying Wang Oct 2019

Recent Progress On Zinc-Ion Rechargeable Batteries, Wangwang Xu, Ying Wang

Faculty Publications

The increasing demands for environmentally friendly grid-scale electric energy storage devices with high energy density and low cost have stimulated the rapid development of various energy storage systems, due to the environmental pollution and energy crisis caused by traditional energy storage technologies. As one of the new and most promising alternative energy storage technologies, zinc-ion rechargeable batteries have recently received much attention owing to their high abundance of zinc in natural resources, intrinsic safety, and cost effectiveness, when compared with the popular, but unsafe and expensive lithium-ion batteries. In particular, the use of mild aqueous electrolytes in zinc-ion batteries (ZIBs) …

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The Use Of Entropy In Modeling The Mechanical Degradation Of Grease, Alan Gurt, Michael Khonsari Oct 2019

The Use Of Entropy In Modeling The Mechanical Degradation Of Grease, Alan Gurt, Michael Khonsari

Faculty Publications

Recent theoretical developments linking degradation to the thermodynamic concept of entropy have allowed a new approach to modeling all types of degradation. The theory has been successfully applied to wear, fatigue, and numerous other forms of degradation and experimentation has confirmed its applicability to modeling the mechanical degradation of lubricating grease. This paper overviews the mechanical degradation of grease, discusses past and present modeling techniques, shows how new techniques can be used to predict grease life, and provides suggestions for future research.

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Hardware Accelerator For Adversarial Attacks On Deep Learning Neural Networks, Haoqiang Guo, Lu Peng, Jian Zhang, Fang Qi, Lide Duan Oct 2019

Hardware Accelerator For Adversarial Attacks On Deep Learning Neural Networks, Haoqiang Guo, Lu Peng, Jian Zhang, Fang Qi, Lide Duan

Faculty Publications

Recent studies identify that Deep learning Neural Networks (DNNs) are vulnerable to subtle perturbations, which are not perceptible to human visual system but can fool the DNN models and lead to wrong outputs. A class of adversarial attack network algorithms has been proposed to generate robust physical perturbations under different circumstance. These algorithms are the first efforts to move forward secure deep learning by providing an avenue to train future defense networks, however, the intrinsic complexity of them prevents their broader usage.In this paper, we propose the first hardware accelerator for adversarial attacks based on memristor crossbar arrays. Our design …

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Reduction Of Structural Damage From The Thermal Expansion Of Concrete Using Multifunctional Materials, Darren Hartl, Mirmilad Mirsayar Oct 2019

Reduction Of Structural Damage From The Thermal Expansion Of Concrete Using Multifunctional Materials, Darren Hartl, Mirmilad Mirsayar

Publications

This study leveraged past successes in the analysis and design of shape memory alloy (SMA) components to address the issue of thermal expansion in concrete structures. Since the SMA used in the current work is relatively cheaper than other common SMAs (less than $50/lb compared to NiTi which is $200/lb due to difficulties in processing), it is anticipated that the findings of the study could be implemented in real infrastructures made of concrete, asphalt concrete, and other complex large infrastructure. Low-cost Fe-SMAs and other multifunctional materials can be considered as a replacement for components made of steel (e.g., in reinforced …

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Crafting Identity: Language, Gender, And The Internet In The Arab World, Connor C. Rouillier Oct 2019

Crafting Identity: Language, Gender, And The Internet In The Arab World, Connor C. Rouillier

Honors Capstones

No abstract provided.

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Soil-Recycled Aggregate-Geopolymer Road Base/Subbase Mixtures: Steps Towards Sustainability, Mohammad Khattak, Daniel Odion Oct 2019

Soil-Recycled Aggregate-Geopolymer Road Base/Subbase Mixtures: Steps Towards Sustainability, Mohammad Khattak, Daniel Odion

Publications

This study deals with the development of Soil-Geopolymer mixtures using flyash, alkali activator and recycled aggregates (RAG) including recycled concrete (RCA) and reclaimed asphalt (RAP) as an alternative to soil-cement for pavement base and subbase layers. Several mix constituents were varied such as flyash type and content, RCA and RAP content and ratio of sodium silicate and sodium hydroxide. Experiment design was established and mechanical and durability characteristics of Soil-RAG-Geopolymer mixtures were evaluated and then compared to the conventional soil-cement mixtures. The results of the testing showed that for the selected Soil-RAG-Geopolymer mixtures the strength, stiffness, permanent deformation, and durability …

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The Impact Of Hurricane Harvey On Pavement Structures In The South East Texas And South West Louisiana, Stefan Romanoschi Oct 2019

The Impact Of Hurricane Harvey On Pavement Structures In The South East Texas And South West Louisiana, Stefan Romanoschi

Publications

This study developed a methodology to estimate the damage caused by flooding, such that caused by Hurricane Harvey, on a road or street network. The flooded street or pavement sections are identified using GIS flood maps with street GIS maps used for pavement management systems (PMS) by cities or state authorities. Then the damage caused by flooding directly through the increase moisture in foundation layers or indirectly due to the increase heavy traffic during the relief effort is estimated. An example Excel macro was created to illustrate the estimation process. The methodology estimates the increase in rehabilitation costs since the …

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Rheological Properties Of Asphalt Binder Modified With Recycled Asphalt Materials And Light-Activated Self-Healing Polymers, Sharareh Shirzad, Marwa M. Hassan, Max A. Aguirre, Louay N. Mohammad, Samuel Cooper, Ioan I. Negulescu Sep 2019

Rheological Properties Of Asphalt Binder Modified With Recycled Asphalt Materials And Light-Activated Self-Healing Polymers, Sharareh Shirzad, Marwa M. Hassan, Max A. Aguirre, Louay N. Mohammad, Samuel Cooper, Ioan I. Negulescu

Faculty Publications

Ultraviolet (UV), light-activated, self-healing polymers are an emerging technology that was proposed to enhance the elastic behavior of asphalt binder, while improving its self-healing properties. The objective of this study was to evaluate the effects of self-healing polymer on the rheological properties of binder blends prepared with or without recycled asphalt materials. Binder blends were prepared with two different binders (PG 67-22 and PG 70-22M), with or without recycled asphalt materials, and 5% self-healing polymer (Oxetane-substituted Chitosan-Polyurethane). High-Pressure Gel Permeation Chromatography (HP-GPC) results showed an increase in High Molecular Weight (HMW) components in the binder with an increase in stiffness …

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