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Showing 101 - 120 of 617 results
  • Elucidating the Polycyclic Aromatic Hydrocarbons Involved in Soot Inception
    Elucidating the Polycyclic Aromatic Hydrocarbons Involved in Soot Inception
    Shao, Can ;
    Wang, Qi
    2023-10-01 | PDF
    Polycyclic aromatic hydrocarbons are the main precursors to soot particles in combustion systems. A lack of direct experimental evidence has led to controversial theoretical explanations for the transition from gas-phase species to organic soot clusters. This work focuses on sampling infant soot particles from well-defined flames followed by analys ...
  • Characterizing Temporal Trends in Populations Exposed to Aircraft Noise Around US Airports 19952015
    Characterizing Temporal Trends in Populations Exposed to Aircraft Noise Around U.S. Airports: 1995–2015
    Nguyen, Daniel D ;
    Levy, Jonathan I
    2023-09-21 | PDF
    National-scale analyses showed non-monotonic trends in mean exposed areas that peaked in 2000, followed by a 37% decrease from 2005 to 2010 and a subsequent increase in 2015. We identified four distinct trajectory groups of airports sharing latent characteristics related to size and activity patterns. Those populations identifying as minority (e.g. ...
    Supporting Files
  • The Role of Topography for Secondary Sonic Boom Reflection
    The Role of Topography for Secondary Sonic Boom Reflection
    Sparrow, Victor W. ;
    Riegel, Kimberly A
    2023-09-15 | PDF
    This paper describes an initial investigation on the reflection of secondary sonic booms, based on the surface topography. It is hypothesized that the type of secondary sonic booms resulting from a primary boom surface reflection could be substantially affected by the topography. A primary boom impacting a flat ocean will provide for a coherent ref ...
  • Accounting for Plume Rise of Aircraft Emissions in AERMOD
    Accounting for Plume Rise of Aircraft Emissions in AERMOD
    Pandey, Gavendra ;
    Venkatram, Akula
    2023-09-01 | PDF
    The U.S. Federal Aviation Administration (FAA) uses the Aviation Environmental Design Tool (AEDT) to assess the impact of airport emissions on air quality in and around an airport. AEDT incorporates EPA's (Environmental Protection Agency) regulatory model, AERMOD. The area/volume source algorithm in AERMOD is currently used to treat most airport so ...
  • Project 009 Geospatially Driven NoiseEstimation Module
    Project 009 Geospatially Driven Noise-Estimation Module
    Mavris, Dimitri N. ;
    Pfaender, Holger
    2023-09-01 | PDF
    The goal of this project was to research potential open-source alternative geospatial frameworks for upgrading AEDT, and to test and experiment with different novel computational approaches in order to drastically speed up the noise exposure calculations from potential large numbers of UAS being operated for package delivery or other potential UAS ...
  • Seat and Occupant Response in Energy Absorbing Seats [supporting datasets]
    Taylor, Amanda M. ;
    Moorcroft, David M.
    2023-08-16 | PDF
    This project will evaluate potential methods for replacement of worn seat cushions used in energy absorbing seats. Streamlined approaches to the replacement of worn cushions in aircraft seats have been requested by the aviation industry. The FAA developed a method for seats that do not require energy absorption (Part 25 and Part 23 passenger) based ...
    Dataset Supporting Files
  • Summary of Case Studies and Observations on Airport Experience with Pavement Surface Treatments
    Summary of Case Studies and Observations on Airport Experience with Pavement Surface Treatments
    Dzwilewski, Peter-Paul ;
    Peshkin, David
    2023-08-09 | PDF
    The Federal Aviation Administration Airport Technology Research and Development Branch sponsored a study of pavement surface treatments with two main objectives: to identify best practices and to propose guidance for selecting surface treatments as the appropriate treatment strategy for airport pavements. Twelve airports and agencies with surface t ...
  • Helicopter Noise Source Separation Using an Order Tracking Filter
    Helicopter Noise Source Separation Using an Order Tracking Filter
    Rachaprolu, Joel Sundar ;
    Greenwood, Eric
    2023-08-01 | PDF
    Due to the importance of understanding the aeroacoustics of rotorcraft with continually changing noise sources, this paper presents a new technique for source separation from ground-based acoustic measurements. The source separation process is based on combining a time-domain de-Dopplerization method with the Vold-Kalman (VK) order tracking filter ...
  • Prediction of the Derived Cetane Number of Hydrocarbon Fuels Using ExtendedWavelength FTIR Spectra and Support Vector Regression
    Prediction of the Derived Cetane Number of Hydrocarbon Fuels Using Extended-Wavelength FTIR Spectra and Support Vector Regression
    Boddapati, Vivek ;
    Ferris, Alison M
    2023-07-01 | PDF
    The need for rapid mitigation of climate change and aviation-related emissions has been the driving force behind the development and deployment of alternative jet fuels (AJFs). Research efforts have mainly focused on hydrocarbons (and their blends) derived from non-petroleum feedstocks, designed to act as a direct replacement for conventional disti ...
  • Maximizing Sustainable Aviation Fuel Usage Through Optimization of Distillation Cut Points and Blending
    Maximizing Sustainable Aviation Fuel Usage Through Optimization of Distillation Cut Points and Blending
    Yang, Zhibin ;
    Boehm, Randall C.
    2023-07-01 | PDF
    Sustainable aviation fuel pathways do not generally yield selective synthetic blend components in the aviation turbine fuel distillation range. Here we discuss a methodology for maximizing the sustainable aviation fuel yield from a pathway and the respective blend ratio with a petroleum-derived fuel by varying distillation cut points. These cut poi ...
  • Seat and Occupant Response in Energy Absorbing Seats
    Seat and Occupant Response in Energy Absorbing Seats
    Taylor, Amanda M. ;
    Moorcroft, David M.
    2023-06-01 | PDF
    The Federal Aviation Administration (FAA) has undertaken research programs to support streamlining various facets of the seat certification process. Previous research evaluated potential methods to qualify replacement of worn seat cushions used in low G applications (Part 25 and Part 23 passenger) and better quantify variability in vertical testing ...
  • Measurements of Nitrile Rubber Absorption of Hydrocarbons Trends for Sustainable Aviation Fuel Compatibility
    Measurements of Nitrile Rubber Absorption of Hydrocarbons: Trends for Sustainable Aviation Fuel Compatibility
    Faulhaber, Conor ;
    Borland, Christopher
    2023-06-01 | PDF
    he commercial aviation sector is seeking to reach net zero CO2 emissions by 2050, with sustainable aviation fuel (SAF) being the most important lever. However, SAF is currently limited by ASTM specifications to a maximum of 50%v blending with conventional jet fuel. One reason for the current blend limit is motivation to maintain o-ring swelling con ...
  • Associations Between LongTerm Aircraft Noise Exposure Cardiovascular Disease and Mortality in US Cohorts of Female Nurses
    Associations Between Long-Term Aircraft Noise Exposure, Cardiovascular Disease, and Mortality in US Cohorts of Female Nurses
    Grady, Stephanie T. ;
    Hart, Jaime E
    2023-06-01 | PDF
    There is limited research examining aircraft noise and cardiovascular disease (CVD) risk. The objective of this study was to investigate associations of aircraft noise with CVD among two US cohorts, the Nurses’ Health Study (NHS) and Nurses’ Health Study II (NHSII).
  • Comprehensive Characterization of Kukui Nuts as Feedstock for Energy Production in Hawaii
    Comprehensive Characterization of Kukui Nuts as Feedstock for Energy Production in Hawaii
    Fu, Jinxia ;
    Weber, Seren
    2023-06-01 | PDF
    Fuel properties of oil-bearing kukui (Aleurites moluccana) nuts, a commonly found crop in Hawaii and tropical Pacific regions, were comprehensively studied to evaluate their potential for bioenergy production. Proximate and ultimate analyses, heating value, and elemental composition of the seed, shell, and de-oiled seed cake were determined across ...
  • Gene Expression and Biomarker Utility in Postmortem Samples Data Management Plan
    Gene Expression and Biomarker Utility in Postmortem Samples [Data Management Plan]
    Nicholson, Scott J.
    ORCID ICON IMG
    2023-05-12 | PDF
    This study is intended to identify genetic biomarkers associated with consumption of cannabis in order to expand thresholds of detection and ability to detect use of drugs that are difficult to assay with traditional biochemistry-based toxicology assays. This project will produce a method of genetics-based detection of drug use in sample specimens ...
  • Comparison of the Human Transcriptional Response to Three Hypoxic Environments Data Management Plan
    Comparison of the Human Transcriptional Response to Three Hypoxic Environments [Data Management Plan]
    Nicholson, Scott J.
    ORCID ICON IMG
    2023-05-02 | PDF
    Data management plan for study on hypoxia training is a standard facet of military aviator training, performed to familiarize airmen with the symptoms of hypoxia.
  • Spectral Proper Orthogonal Decomposition of Harmonically Forced Turbulent Flows
    Spectral Proper Orthogonal Decomposition of Harmonically Forced Turbulent Flows
    Heidt, Liam F ;
    Colonius, Tim
    2023-05-01 | PDF
    Many turbulent flows exhibit time-periodic statistics. These include turbomachinery flows, flows with external harmonic forcing, and the wakes of bluff bodies. Many existing techniques for identifying turbulent coherent structures, however, assume the statistics are statistically stationary. In this paper, we leverage cyclostationary analysis, an e ...
  • Effects of Cannabinoids and Postmortem Interval on Gene Expression Considerations for the Forensic Genetic Analysis of Civil Aviation Accident Victims
    Effects of Cannabinoids and Postmortem Interval on Gene Expression: Considerations for the Forensic Genetic Analysis of Civil Aviation Accident Victims
    Tracy, Christopher J ;
    Nicholson, Scott J.
    2023-05-01 | PDF
    Cannabis is the third most commonly used drug of abuse following alcohol and tobacco in the United States. Cannabis is federally classified as a Schedule I substance under the Controlled Substances Act of 1970 but is legal for medicinal and/or recreational purposes in 39 US states. However, cannabis use by safety-sensitive personnel, including cert ...
  • Comparison of the Human Transcriptional Response to Three Hypoxic Environments
    Comparison of the Human Transcriptional Response to Three Hypoxic Environments
    Nicholson, Scott J. ;
    Munster, Susan K.
    2023-04-06 | PDF
    Hypoxia awareness training is a standard facet of military aviator training that is performed to familiarize aviators with the symptoms of hypoxia. The three most common training devices are the hypobaric altitude chamber (AC), the normobaric reduced oxygen breathing device (ROBD), and the normobaric reduced oxygen breathing environment (ROBE). The ...
  • Development Verification and Validation of GLOC Model Data Management Plan
    Development, Verification, and Validation of G-LOC Model [Data Management Plan]
    Copeland, Kyle
    ORCID ICON IMG
    2023-04-05 | PDF
    The published models of G-LOC and recovery in the public domain are based on empirical fits to data from centrifuge experiments and on blood pressure. A resource-flow based model of G-LOC and recovery built using more detailed physics and physiology will be developed. This new model is implemented via software and results will be compared with exis ...
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