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Showing 21 - 40 of 617 results
  • 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 ...
  • 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 ...
  • Project 071 Predictive Simulation of nvPM Emissions in Aircraft Combustors
    Project 071 Predictive Simulation of nvPM Emissions in Aircraft Combustors
    Menon, Suresh ;
    Karpe, Shubham Basavaraj
    2025-09-30 | PDF
    This project aimed to establish a new multiscale framework for predicting soot formation in both canonical and practically relevant sooting flames. A hierarchy of first-principles simulation methods was employed to capture the multiscale physics governing the formation and transport of non-volatile particulate matter (nvPM, commonly referred to as ...
  • Project 061 Noise Certification Streamlining
    Project 061 Noise Certification Streamlining
    Mavris, Dimitri N. ;
    Balchanos, Michael
    2025-09-30 | PDF
    Noise certification procedures (with their inclusion of equivalent procedures) have served aviation stakeholders (i.e., original equipment manufacturers [OEM], regulators, operators, airports, etc.) well since the 1960s. With new vehicle types and new technologies (including new entrants, digital technologies for airframes, propulsion, and measurem ...
  • 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 ...
  • 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 ...
  • Project 060 Analytical Methods for Expanding the AEDT Aircraft FLEET Database
    Project 060 Analytical Methods for Expanding the AEDT Aircraft FLEET Database
    Mavris, Dimitri N. ;
    Kirby, Michelle R.
    2025-09-01 | PDF
    The goal of this research is to increase the accuracy of AEDT noise and emissions modeling of aircraft not currently in the ANP database. Georgia Tech will identify, and review aircraft not currently modeled in the AEDT, and will collect information and necessary data to better understand the characteristics of these aircraft. Various statistical a ...
  • 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 ...
  • FAA Center of Excellence for Alternative Jet Fuels Environment Annual Technical Report 2025 For the Period October 1 2024 September 30 2025
    FAA Center of Excellence for Alternative Jet Fuels & Environment: Annual Technical Report 2025: For the Period October 1, 2024 - September 30, 2025
    United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment
    2025-09-01 | PDF
    This report covers the period October 1, 2024, through September 30, 2025. The Center was established by the authority of FAA solicitation 13-C-AJFE-Solicitation. The ASCENT website can be viewed at ascent.aero. The next meeting will be held during the months of April, May, and June 2025.
  • 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 ...
  • Identification of Stochastic Manufacturing Defects Within Additively Manufactured Acoustic Liners
    Identification of Stochastic Manufacturing Defects Within Additively Manufactured Acoustic Liners
    Windows, Joseph ;
    Packer, Alden
    2025-08-01 | PDF
    The exploration of novel acoustic liner designs using 3D internal lattices has become a growing topic of interest within the field of additive manufacturing (AM). However, the comparison between the acoustic liner response of computational simulation and experimental testing tends to show significant deviation. A potential cause of this deviation i ...
  • Evaluating the Performance of Novel TPMSBased Acoustic Liner Designs Suitable for Additive Manufacturing
    Evaluating the Performance of Novel TPMS-Based Acoustic Liner Designs Suitable for Additive Manufacturing
    Packer, Alden ;
    Reimann, C. Aaron
    2025-08-01 | PDF
    Acoustic liners are integral to the noise management of aircraft engines. As such, acoustic liner designs and configurations are the subject of research and development to address the acoustic requirements of novel engine layouts. Perforate sheet over honeycomb core, or single degree of freedom (SDOF), liners are the traditional system that has bee ...
  • 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 ...
  • Human Factors Guidance for the Integration of Artificial Intelligence and Machine Learning in FAA Systems
    Human Factors Guidance for the Integration of Artificial Intelligence and Machine Learning in FAA Systems
    Smith, Philip J. ;
    Roth, Emilie M.
    2025-07-31 | PDF
    The goal of this project has been to develop a document providing guidance on the integration of artificial intelligence (AI)/machine learning (ML) technologies within information automation in FAA systems to support safety critical operations for air traffic control, traffic flow management and technical operations (maintenance). In this document ...
  • Upgrading Biocrude Oil into Sustainable Aviation Fuel Using ZeoliteSupported IronMolybdenum Carbide Nanocatalysts
    Upgrading Biocrude Oil into Sustainable Aviation Fuel Using Zeolite-Supported Iron-Molybdenum Carbide Nanocatalysts
    Yu, Siying ;
    He, Haozhen
    2025-06-01 | PDF
    Food waste is an underdeveloped source for production of sustainable aviation fuel (SAF). Now, there is no certified conversion process of food waste for SAF by American Society for Testing and Materials (ASTM). We report the use of zeolite-supported molybdenum carbide nanocatalysts in upgrading biocrudes, produced from food wastes through HTL, int ...
  • Howling of a ModelScale Nozzle Due to ShockInduced BoundaryLayer Separation at Its Exit
    Howling of a Model-Scale Nozzle Due to Shock-Induced Boundary-Layer Separation at Its Exit
    Ramsey, David N. ;
    Gavin, Joseph R.
    2025-06-01 | PDF
    The jet from a model-scale, internally mixed nozzle produced a loud howling when operated at jet Mach numbers between 0.80 and 1.00. Discrete tones dominated the noise radiated to the far field and powerful oscillations were present in the jet. To explain these observations, this paper leverages a blend of experimental acoustic and flow measurement ...
  • Signal Design Handbook A New Framework for Designing Alarms Alerts and Warnings in Air Traffic Control
    Signal Design Handbook: A New Framework for Designing Alarms, Alerts, and Warnings in Air Traffic Control
    Ruskin, Keith J. ;
    Ruskin, Anna Clebone
    2025-05-19 | PDF
    The Federal Aviation Administration’s air traffic control organization (ATO) encompasses a variety of facilities that include towers, terminal radar approach control facilities (TRACONs), and air route traffic control centers (ARTCCs). Air traffic controllers use alarms, alerts, and warnings (collectively, signals) as an aid to situation awareness ...
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