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Showing 1 - 20 of 617 results
  • Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Field Evaluation of Lightweight Noise Barriers and Development of Noise Barrier Inspection and Asset Management Program
    Provines, Jason T.
    2026-06-01 | PDF
    Noise barriers along high-volume roads reduce traffic noise using either normal-weight materials, such as concrete or brick, or lightweight materials, such as metal, composites, fiberglass, or acrylic. Although the Virginia Department of Transportation's (VDOT) current concrete noise barriers have proven durable, some lightweight metal noise barrie ...
  • A TechnoEconomic Carbon Intensity and Policy Assessment of Hydrogen Production in the United States
    A Techno-Economic, Carbon Intensity, and Policy Assessment of Hydrogen Production in the United States
    Sierra-Jimenez, Valentina ;
    Brandt, Kristin
    2026-04-10 | PDF
    Comparing studies that involve techno-economic analyses (TEA) and life cycle assessments (LCA) for different hydrogen production technologies is challenging due to inconsistent assumptions across studies. Thus, this research develops a harmonized framework to assess seven hydrogen production pathways - water electrolysis, methane pyrolysis, biomass ...
  • 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 ...
  • 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 ...
  • Framing Camera Timeresolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor
    Framing Camera Time-resolved Laser Induced Incandescence Measurements in a Rich Quench Lean Combustor
    Douglas, Eric J. ;
    Vishwanath, Rahul
    2026-03-01 | PDF
    Determining the size of soot particles in dynamic turbulent flames is critical for optimizing injector and combustor designs. In this work, we demonstrate the first use of a gigahertz-rate framing camera for planar time-resolved laser-induced incandescence (TiRe-LII) measurements in a rich quench lean (RQL) combustion system with Jet A fuel. In thi ...
  • 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.
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • Project 099 Conceptual Analysis of Cryogenic Hydrogen Distribution to Airports
    Project 099 Conceptual Analysis of Cryogenic Hydrogen Distribution to Airports
    Leachman, Jacob ;
    Nagasawa, Kazunori
    2025-12-01 | PDF
    The goal of this project is to add corresponding cryogenic hydrogen infrastructure analysis to a previous study conducted at NREL. Sponsored by the FAA, NREL's study investigated hydrogen implementation at the Seattle, Portland, San Francisco, and Los Angeles airports, primarily focusing on gaseous hydrogen delivery and conducting technoeconomic, e ...
  • 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 ...
  • 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 ...
  • 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 ...
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