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Showing 1 - 20 of 553 results
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • 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 ...
  • TASOPTjl A Julia Package for Conceptual Commercial Transport Aircraft Design
    TASOPT.jl: A Julia Package for Conceptual Commercial Transport Aircraft Design
    Prashanth, Prakash ;
    Gomez-Vega, Nicolas
    2025-09-03 | PDF
    Aircraft design is a multidisciplinary field that spans aerodynamics, structures, thermodynamics and propulsion. Prior approaches to this problem have consisted of historical correlations, empirical drag and simplified propulsion system models (Raymer, 2018; Roskam, 2002; Torenbeek, 1982). TASOPT, originally written in FORTRAN and developed by Mark ...
  • An Experimental Evaluation of an Electronic Rotor Phase Synchronization System for Multirotor Aircraft Noise Control
    An Experimental Evaluation of an Electronic Rotor Phase Synchronization System for Multirotor Aircraft Noise Control
    Valente, Vítor T ;
    Greenwood, Eric
    2025-09-01 | PDF
    Multirotor electric vertical take-off and landing vehicles and small unmanned aircraft systems commonly use distributed electric propulsion. One approach to reducing their noise involves synchronizing rotor phase relationships to control radiated noise directionally. This paper presents a practical electronic phase synchronization method for multir ...
  • Geometric and Positional Isomer Effects on Ignition Behavior of Cycloalkanes Implications for Sustainable Aviation Fuels
    Geometric and Positional Isomer Effects on Ignition Behavior of Cycloalkanes: Implications for Sustainable Aviation Fuels
    Yang, Zhibin ;
    Faulhaber, Conor
    2025-09-01 | PDF
    This study investigates the ignition behavior of six dimethylcyclohexane (DMCH) isomers and cis-/trans-decalin, focusing on the effects of molecular geometry and substitution patterns. Ignition delay and derived cetane number (DCN) were measured using a CFR ignition quality tester under ASTM D6890 conditions. Among the DMCH isomers, cis-1,3-DMCH ex ...
  • Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Effects of Extreme Climate Shifts to Pavement Infrastructure in Tennessee
    Onyango, Mbakisya ;
    Fomunung, Ignatius
    2025-09-01 | PDF
    Resilient pavement infrastructure is a dream of every transportation agency. Many factors affect the health of pavement infrastructure to include extreme climate shifts. This study evaluated the effects of climate shifts to pavement infrastructure in Tennessee. The study used AASHTOWare PMED software to predict distresses on selected pavement secti ...
  • Modeling Uncertainties in Primary Zone Soot Predictions for a RichQuenchLean Combustion System
    Modeling Uncertainties in Primary Zone Soot Predictions for a Rich-Quench-Lean Combustion System
    Karpe, Shubham Basavaraj ;
    Menon, Suresh
    2025-08-01 | PDF
    A comprehensive uncertainty quantification (UQ) of soot volume fraction (SVF) predictions in the primary zone of a Rich-Quench-Lean (RQL) combustor is presented, with particular emphasis on the modeling uncertainties in the rates of nucleation, growth, oxidation, condensation, and coagulation. Large-eddy simulations (LES) of soot formation in a rea ...
  • Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve MR Analysis and Project Development
    Evaluation and Development of Cost Prediction Models for Resurfacing Projects To Improve M&R Analysis and Project Development
    Shrestha, K. Joseph ;
    Uddin, Mohammad Moin
    2025-08-01 | PDF
    Accurate preliminary cost estimates for resurfacing projects are essential to conduct a reliable Maintenance & Rehabilitation (M&R) analysis, prioritize projects, and optimize the use of available budget. However, TDOT is currently using an outdated cost per lane mile data for such analysis, and hence the results of such analysis can be less reliab ...
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