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Showing 101 - 120 of 596 results
  • 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 ...
  • Distributed Heat Release Effects on Entropy Generation by Premixed Laminar Flames
    Distributed Heat Release Effects on Entropy Generation by Premixed, Laminar Flames
    Laksana, Akbar ;
    Patki, Parth
    2023-04-01 | PDF
    This article studies the generation of entropy disturbances by laminar premixed flames. The total entropy generation equals the integrated ratio of the local heat release rate and the local temperature, namely, ∫(q˙/T)dV . Due to this path dependency, evaluating this integral requires an understanding of how the heat release is distributed in the t ...
  • Assessment of RNAseq Sample Preparation Methodology Data Management Plan
    Assessment of RNA-seq Sample Preparation Methodology [Data Management Plan]
    Munster, Susan K.
    2023-04-01 | PDF
    This study was designed to designed to address concerns regarding effects of lab processing techniques on downstream results and also to determine an optimal combination of software programs to use to align genetic data and assess differential expression. Homogeneous lab samples were tested using two different purification methods and compared to u ...
  • Associations between Aircraft Noise Exposure and SelfReported Sleep Duration and Quality in the United StatesBased Prospective Nurses Health Study Cohort
    Associations between Aircraft Noise Exposure and Self-Reported Sleep Duration and Quality in the United States-Based Prospective Nurses’ Health Study Cohort
    Bozigar, Matthew ;
    Huang, Tianyi
    2023-04-01 | PDF
    Sleep disruption is linked with chronic disease, and aircraft noise can disrupt sleep. However, there are few investigations of aircraft noise and sleep in large cohorts. We examined associations between aircraft noise and self-reported sleep duration and quality in the Nurses’ Health Study, a large prospective cohort.
  • MultiComponent Resilience Assessment Framework for a Supply Chain System
    Multi-Component Resilience Assessment Framework for a Supply Chain System
    Zhao, Jie ;
    Lee, Ji Yun
    2023-04-01 | PDF
    The goal of this paper is to develop a quantitative resilience assessment framework for a supply chain system exposed to multiple risk factors. Most existing studies on supply chain resilience have primarily focused on assessing the system’s ability to withstand and recover from disruptions caused by a single type of hazard. However, a supply chain ...
  • Limits of Identification Using VUV Spectroscopy Applied to C8H18 Isomers Isolated by GCGC
    Limits of Identification Using VUV Spectroscopy Applied to C8H18 Isomers Isolated by GC×GC
    Bell, David C ;
    Feldhausen, John
    2023-03-01 | PDF
    The vacuum ultraviolet detector for gas chromatography can be used to identify structural differences between isomers with similar chromatographic elution times, which adds detail to characterization, valuable for prescreening of sustainable aviation fuel candidates. Although this capability has been introduced elsewhere, vacuum ultraviolet spectro ...
  • Assessing the Impact of Aircraft Arrival on Ambient Ultrafine Particle Number Concentrations in NearAirport Communities in Boston Massachusetts
    Assessing the Impact of Aircraft Arrival on Ambient Ultrafine Particle Number Concentrations in Near-Airport Communities in Boston, Massachusetts
    Chung, Chloe S ;
    Lane, Kevin
    2023-03-01 | PDF
    Aircraft emissions contribute to overall ambient air pollution, including ultrafine particle (UFP) concentrations. However, accurately ascertaining aviation contributions to UFP is challenging due to high spatiotemporal variability along with intermittent aviation emissions. The objective of this study was to evaluate the impact of arrival aircraft ...
  • Impact of Design Constraints on Noise and Emissions of Derivative Supersonic Engines
    Impact of Design Constraints on Noise and Emissions of Derivative Supersonic Engines
    Prashanth, Prakash ;
    Voet, Laurens J. A.
    2023-02-01 | PDF
    The propulsion systems used in commercial supersonic transport (SST) aircraft, such as the Concorde, have used repurposed engines or derivative engines based on cores from existing donor engines rather than purpose-designed clean-sheet engines. A similar approach is currently being adopted in the development of new SSTs. Turbomachinery components a ...
  • FAA Center of Excellence for Alternative Jet Fuels Environment Annual Technical Report 2021 For the Period October 1 2021 September 30 2022
    FAA Center of Excellence for Alternative Jet Fuels & Environment: Annual Technical Report 2021: For the Period October 1, 2021 – September 30, 2022
    United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment  ...
    2023-02-01 | PDF
    This report covers the period October 1, 2021, through September 30, 2022. The Center was established by the authority of FAA solicitation 13-C-AJFE-Solicitation. During that time the ASCENT team launched a new website, which can be viewed at ascent.aero. The next meeting(s) will be held during the months of April and May 2023.
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