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Showing 121 - 140 of 617 results
  • 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 ...
  • SingleCamera TimeResolved LaserInduced Incandescence Measurements in a RQL Aeroengine Combustor
    Single-Camera Time-Resolved Laser-Induced Incandescence Measurements in a RQL Aeroengine Combustor
    McGrath, Russell ;
    Bugay, Ezekiel M.
    2023-03-22 | PDF
    Understanding and measuring the formation of non-volatile particulate matter is important for minimizing emissions and improving the design of aeroengines. In rich-burn, quick-mix, lean-burn (RQL) combustors, significant quantities of soot are formed near the injectors, some of which is later oxidized downstream. In order to better understand the s ...
  • 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.
  • Project 034 National Jet Fuels Combustion Program Area 7 Overall Program Integration and Analysis
    Project 034 National Jet Fuels Combustion Program – Area #7: Overall Program Integration and Analysis
    Heyne, Joshua ;
    Stouffer, Scott
    2023-02-01 | PDF
    This project involved coordination between dozens of researchers and stakeholders from several different countries relating to the influence of jet fuel variation on sprays and combustion operability including ignition and lean blowout, and the models required to anticipate combustor performance. The models included chemical kinetic models of the c ...
  • RNASeq Alignment and Differential Expression Software Comparison
    RNA-Seq Alignment and Differential Expression Software Comparison
    Munster, Susan K. ;
    Nicholson, Scott J.
    2023-01-01 | PDF
    The twofold goals for this study were to determine an optimum choice for ribonucleic acid sequencing (RNA-Seq) alignment software and to determine which differential expression software packages produced consistent and accurate results. RNA was extracted from blood and pooled to produce homogenous sample material to ensure that any differential exp ...
  • What are ECG Normal Variants
    What are ECG Normal Variants?
    United States. Department of Transportation. Federal Aviation Administration. Civil Aerospace Medical Institute. Aerospace Medical Education Division
    2023-01-01 | Aeromedical Safety Brochures | PDF
    Aeromedical Safety Brochures are prepared for general aviation pilots, commercial pilots and physicians. The brochures acquaint the aviation community with the physiological challenges of the aviation environment and relevant safety concerns.
    Supporting Files
  • An Evaluation of the Downstream Effects of Purification Methods on RNASeq Differential Expression
    An Evaluation of the Downstream Effects of Purification Methods on RNA-Seq Differential Expression
    Munster, Susan K. ;
    Uyhelji, Hilary A.
    2023-01-01 | PDF
    Ribonucleic acid sequencing (RNA-Seq) is a valuable and commonly used technique to quantify the number of individual RNA transcripts within a sample. RNA-Seq typically requires a small amount of pure and concentrated RNA, which can necessitate additional concentration or purification of previously isolated RNA samples. Magnetic beads and silica-bas ...
  • Effect of Pelvic Loading during Anthropomorphic Test Device Storage
    Effect of Pelvic Loading during Anthropomorphic Test Device Storage
    Hellstrom, Ian T. ;
    Moorcroft, David M.
    2023-01-01 | PDF
    As part of a larger project aimed at gaining a better understanding of factors that affect the quality of test results using Anthropomorphic Test Devices (ATDs), the FAA tested the effects of long-term static ATD pelvis loading during storage. Testing simulated two types of ATD pelvis storage methods of the 50th percentile Hybrid III ATD for one ye ...
  • A Handbook for Signal Design Alarms Alerts and Warnings in Air Traffic Control
    A Handbook for Signal Design: Alarms, Alerts, and Warnings in Air Traffic Control
    Ruskin, Keith J ;
    Rice, Stephen
    2022-12-09 | 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). Well trained air traffic controllers using effective automation can exploit alarms, alerts and warnings (collectiv ...
  • LongTerm Aircraft Noise Exposure and Risk of Hypertension in Postmenopausal Women 2022
    Long-Term Aircraft Noise Exposure and Risk of Hypertension in Postmenopausal Women [2022]
    Nguyen, Daniel D ;
    Whitsel, Eric A
    2022-12-01 | PDF
    Background: Studies of the association between aircraft noise and hypertension are complicated by inadequate control for potential confounders and a lack of longitudinal assessments, and existing evidence is inconclusive. Objectives: We evaluated the association between long-term aircraft noise exposure and risk of hypertension among post-menopausa ...
  • Error Quantification of the Arrhenius Blending Rule for Viscosity of Hydrocarbon Mixtures
    Error Quantification of the Arrhenius Blending Rule for Viscosity of Hydrocarbon Mixtures
    Boehm, Randall C. ;
    Hauck, Franchesca
    2022-12-01 | PDF
    Six hundred and seventy-five measurements of dynamic viscosity and density have been used to assess the prediction error of the Arrhenius blending rule for kinematic viscosity of hydrocarbon mixtures. Major trends within the data show that mixture complexity–binary to hundreds of components—and temperature are more important determinants of predict ...
  • An Error Quantification of the Arrhenius Blending Rule for Viscosity of Hydrocarbon Mixtures Supplemental Materials
    An Error Quantification of the Arrhenius Blending Rule for Viscosity of Hydrocarbon Mixtures [Supplemental Materials]
    Boehm, Randall C. ;
    Hauck, Franchesca
    2022-12-01 | PDF
    All the viscosity and density data measured in support of this manuscript are provided within the “data” tab of the attached document called HEAT_LAB_ViscosityData_2022 (XLSX). Expanded versions of Tables 1, 2 are provided in the other tab, “Material_list”. A definition of important terms used throughout the theory section is provided in Viscosity_ ...
    Supporting Files
  • FAA Center of Excellence for Alternative Jet Fuels Environment Annual Technical Report 2021 For the Period October 1 2020 September 30 2021 Volume 2
    FAA Center of Excellence for Alternative Jet Fuels & Environment: Annual Technical Report 2021: For the Period October 1, 2020 - September 30, 2021: Volume 2
    United States. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment
    2022-12-01 | PDF
    This report covers the period October 1, 2020, through September 30, 2021. 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 will be held April 5-7, 2022, in Alexandria, VA.
  • FAA Center of Excellence for Alternative Jet Fuels Environment Annual Technical Report 2021 For the Period October 1 2020 September 30 2021 Volume 1
    FAA Center of Excellence for Alternative Jet Fuels & Environment: Annual Technical Report 2021: For the Period October 1, 2020 - September 30, 2021: Volume 1
    United States. Department of Transportation. Federal Aviation Administration. Center of Excellence for Alternative Jet Fuels and Environment
    2022-12-01 | PDF
    This report covers the period October 1, 2020, through September 30, 2021. 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 will be held April 5-7, 2022, in Alexandria, VA.
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