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Showing 1 - 20 of 596 results
  • Evaluation of Backfill Aggregate Properties
    Evaluation of Backfill Aggregate Properties
    Alshibli, Khalid A. ;
    Elkenawi, Mohamed
    2026-03-01 | PDF
    Open-graded granular backfill materials are widely used as retaining wall backfill due to their high shear strength, high permeability, ease to handle, and compaction characteristics. However, the current Tennessee Department of Transportation (TDOT) provisions assume a conservative angle of internal friction for backfill materials. The objective o ...
  • TimeResolved Spray Characterization via Unified Optical Flow and Binarization Technique
    Time-Resolved Spray Characterization via Unified Optical Flow and Binarization Technique
    Brien, Casey J. ;
    Kang, Kyungrae
    2026-03-01 | PDF
    This work leverages an unsupervised machine learning and advanced image processing techniques to characterize the breakup of fuel sprays in a small-scale combustor under reacting conditions, providing valuable insights into near-nozzle flow phenomenology. The proposed methodology integrates an improved optical flow model on a convolutional neural n ...
  • Aviation Infectious Risk and Safety A Collaborative Program for Modeling Infectious Disease Transmission in Air Travel
    Aviation Infectious Risk and Safety: A Collaborative Program for Modeling Infectious Disease Transmission in Air Travel
    Armstrong, Jason ;
    Koolhof, Iain
    2026-03-01 | PDF
    The Aviation Infectious Risk and Safety (AIRS) program addresses the U.S. Government Accountability Office (GAO) recommendation for stronger federal leadership and coordination on communicable disease transmission in air travel. Led by the Federal Aviation Administration (FAA), AIRS integrated The Boeing Company, the Centers for Disease Control and ...
  • Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions
    Updates in Assessing Soil Organic Carbon and Their Implications for Evaluating Land Use Change Emissions
    Benavidez-Brouk, Lauren ;
    Taheripour, Farzad
    2026-02-01 | PDF
    Emissions from land use changes are relevant for environmental policy analysis. Since the late 1990s and early 2000s many of these analyses have examined induced land use changes (ILUC) from biofuel production and policy as well as their associated greenhouse gas (GHG) emissions. These studies have often used the Harmonized World Soil Data (HWSD) t ...
  • The Impact of Soil Erosion on Corn Yields A Spatial Regression Analysis
    The Impact of Soil Erosion on Corn Yields: A Spatial Regression Analysis
    Chen, Le ;
    Yu, T. Edward
    2026-02-01 | PDF
    This study examines the impact of soil erosion on corn (Zea mays L.) yield across counties in the US Midwest. Using a novel county-level panel dataset that includes information on water erosion and corn yield, we analyze the direct and spatial spillover effects of erosion using a spatial regression framework. We find that increases in soil erosion ...
  • Economic and Environmental Evaluation of the Role for Waste CO2 From Ethanol Fermentation to Decarbonize Transportation in the US
    Economic and Environmental Evaluation of the Role for Waste CO2 From Ethanol Fermentation to Decarbonize Transportation in the US
    Keogh, Niamh ;
    Abel, James
    2026-02-01 | PDF
    Transitioning to alternative energy carriers is one of the primary options for reducing greenhouse gas emissions attributable to transportation. In the US, ethanol from corn grain covers 10.5% of gasoline demand from road transport today. Its production could be scaled-up further to also make sustainable aviation fuel. Additionally, the biogenic CO ...
  • Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep
    Efficacy of Pink Noise and Earplugs for Mitigating the Effects of Intermittent Environmental Noise Exposure on Sleep
    Basner, Mathias ;
    Smith, Michael G.
    2026-02-01 | PDF
    Nighttime environmental noise (EN) exposure disturbs sleep and increases morbidity and mortality. Affordable and effective countermeasures are needed, but rigorous research is scarce. This study investigates the efficacy of pink noise (PN) and earplugs for mitigating the effects of intermittent EN on sleep.
  • Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Traffic Data for Network Level Pavement Structural Assessment and Performance Grade Asphalt Selection
    Zhong, Jingtao ;
    Gu, Yangsong
    2026-01-01 | PDF
    Truck traffic is an important input for pavement design and analysis. Proper characterization of traffic patterns contributes to the design of reliable and cost-effective pavement structures. Axle load spectra obtained from the Long-Term Pavement Performance (LTPP) database, together with local Annual Average Daily Traffic (AADT) data from Tennesse ...
  • Assessing a Sustainable Aviation Fuel Supply Chain from Winter Canola and Its Carbon Intensity Considering Feedstock Yield Variations
    Assessing a Sustainable Aviation Fuel Supply Chain from Winter Canola and Its Carbon Intensity Considering Feedstock Yield Variations
    Bolakhe, K. ;
    Yu, T. Edward
    2026-01-01 | PDF
    Replacing conventional aviation fuel (CAF) with sustainable aviation fuel (SAF) has been suggested as a vital means to decarbonize the aviation industry. We considered winter canola a feedstock for SAF production through the hydro-processed esters and fatty acids pathway in the Southeast United States. We incorporated feedstock yield variations in ...
  • Mechanisms Driving Altitude and Latitude dependent Air Quality Variations from HighAltitude NOx Emissions
    Mechanisms Driving Altitude- and Latitude- dependent Air Quality Variations from High-Altitude NOx Emissions
    Oh, Lucas J. ;
    Eastham, Sebastian D.
    2026-01-01 | PDF
    The environmental impact of nitrogen oxide (NOx) emissions varies with emission altitude and latitude. NOx emissions from subsonic aviation (9-12 km) contribute to net global ozone formation, whereas those from supersonic aircraft (above 14 km) lead to net global ozone depletion. However, the effects of NOx emission altitude on surface air quality ...
  • Spatial Optimization of the Sustainable Aviation Fuel Supply Chains From Forest Residues via Fast PyrolysisHydrotreatment Considering Feedstock Ash Content Variability
    Spatial Optimization of the Sustainable Aviation Fuel Supply Chains From Forest Residues via Fast Pyrolysis/Hydrotreatment Considering Feedstock Ash Content Variability
    Li, Pengzhen ;
    Yu, T. Edward
    2025-12-01 | PDF
    Policymakers and the aviation industry are working to decarbonize commercial flights by replacing conventional jet fuel with sustainable aviation fuel (SAF). Logging residues have been identified as a valuable resource for SAF production. However, the quality of the feedstock, particularly the ash content, can adversely affect bio-oil yield and SAF ...
  • Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft
    Impact of Takeoff Trajectory Design on Performance and Noise for Advanced Air Mobility Aircraft
    Gonzalez, Victoria ;
    Yeung, Seraphin H.
    2025-12-01 | PDF
    A broad range of AAM aircraft are currently in development, each with varying community noise footprints and energy consumption depending on the specifics of their departure and arrival flight trajectories, which must be understood for effective airspace integration. This work presents a framework for analyzing AAM trajectory design, focusing on ke ...
  • The Potential ScaleUp of Sustainable Aviation Fuels Production Capacity to Meet Global and EU Policy Targets
    The Potential Scale-Up of Sustainable Aviation Fuels Production Capacity to Meet Global and EU Policy Targets
    Martulli, Alessandro ;
    Brandt, Kristin
    2025-11-01 | PDF
    Sustainable aviation fuels (SAF) can reduce aviation greenhouse gas emissions, yet their production scale-up to meet policy goals remains unexplored. Here, we describe the Global SAF Capacity Database to quantify global and European Union (EU) SAF capacity, comparing it to production capacity announcements. Despite announcements of 9.1 Mt year−1 (2 ...
  • Contrail Observation Limitations Using Geostationary Satellites
    Contrail Observation Limitations Using Geostationary Satellites
    Euchenhofer, Marlene V. ;
    Prashanth, Prakash
    2025-11-01 | PDF
    Contrails are a significant contributor to aviation's climate impact with an effective radiative forcing similar to that from aviation's CO2 emissions, yet large uncertainties remain. Many observational contrail studies rely on data from a single sensor, in recent years increasingly from a geostationary imager, accepting lower spatial resolution in ...
  • Pragmatic Assessment of Meeting the 2030 US Sustainable Aviation Fuel Goal
    Pragmatic Assessment of Meeting the 2030 U.S. Sustainable Aviation Fuel Goal
    Brandt, Kristin ;
    Martinez Valencia, Lina
    2025-11-01 | PDF
    Sustainable aviation fuel (SAF) production is essential for decarbonizing the aviation sector in the short and midterm as well as maintaining the global competitiveness of U.S. airlines, supporting job creation, and ensuring U.S. energy independence. The near-term U.S. SAF target, set by the SAF Grand Challenge, is 11.4 billion liters (3 billion ga ...
  • Strategies for Improved Driver Behavior within Work Zones
    Strategies for Improved Driver Behavior within Work Zones
    Mishra, Sabyasachee ;
    Golias, Mihalis
    2025-10-01 | PDF
    Work zones (WZs) are among the most hazardous roadway environments due to restricted geometry, temporary traffic control, and increased driver workload, which often lead to speeding and elevated crash frequency as well as severity. A section of roadway of nearly 8 miles long on I-65, in Robertson County, near the Kentucky state border, where additi ...
  • Evaluating the Impacts of I24 Smart Corridor Strategies
    Evaluating the Impacts of I-24 Smart Corridor Strategies
    Gu, Yangsong ;
    Han, Lee D.
    2025-10-01 | PDF
    The I-24 Smart Corridor project, launched by TDOT since 2018, is a first-ever Smart Corridor study in Tennessee. This project integrates I-24 and SR-1, a parallel arterial roadway, with physical, technological, and operational enhancements to provide road users with accurate, real-time information and actively manage traffic. The I-24 project is co ...
  • An Analysis of the Risk Narrative Disclosed by Publicly Traded Biofuel Firms
    An Analysis of the Risk Narrative Disclosed by Publicly Traded Biofuel Firms
    Trejo-Pech, Carlos Omar ;
    Bista, Bishal
    2025-10-01 | PDF
    Given the high level of uncertainty prevalent in the immature biofuels industry, the primary objective of this study was to identify and assess the risk factors that biofuel firms face. The study evaluated the risk factors, or specific risks, reported by biofuel firms to the U.S. Securities and Exchange Commission (SEC) over five years. The analysi ...
  • Blend Prediction Model for Vapor Pressure of Jet Fuel Range Hydrocarbons
    Blend Prediction Model for Vapor Pressure of Jet Fuel Range Hydrocarbons
    Boehm, Randall C. ;
    Parker, Robert
    2025-10-01 | PDF
    The ability to predict the vapor pressure and vapor-phase composition of hydrocarbon mixtures (such as jet fuel, sustainable aviation fuel or its un-refined precursors) and partially vaporized hydrocarbon mixtures is important to simulations of processes that involve vaporization such as distillations, flash points, combustion properties of partial ...
  • Cognitive Task Analyses of Air Traffic Management ATM Workforce to Inform Human Performance Modeling
    Cognitive Task Analyses of Air Traffic Management (ATM) Workforce to Inform Human Performance Modeling
    Hall, Breanna ;
    Grigg, Kelly
    2025-09-26 | PDF
    This report documents a comprehensive Cognitive Task Analysis (CTA) conducted by The MITRE Corporation’s Center for Advanced Aviation Systems Development (CAASD) for the Federal Aviation Administration (FAA) Human Factors Division (ANG-C1). The primary objective was to analyze key air traffic workforce positions at Air Route Traffic Control Centers ...
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