Publications

Title Authors Journal Year
Airfoil Design Framework for Optimized Boundary-Layer Integral Parameters Collazo Garcia, A.R. Journal of Aircraft 2024
Air Interactions of Magnetically Driven Plasma Discharges in Crossflow Hristov, G.; Ansell, P.J.; Zimmerman, J.W.; Carroll, D.L. AIAA Journal 2024
Review of Sustainable Energy Carriers for Aviation: Benefits, Challenges, and Future Viability Ansell, P.J. Progress in Aerospace Sciences 2023
System Identification of a Subscale Distributed Electric Propulsion Aircraft Perry, A.T.; Bretl, T.; Ansell, P.J. Journal of Aircraft 2023
Design of Rotary Wings with Passive Mitigation of Coherent Tip Vortex Roll-Up Yu, D.; Ansell, P.J. Journal of Aircraft 2023
Impact of Liquid-Hydrogen Fuel-Cell Electric Propulsion on Aircraft Configuration and Integration Waddington, E.; Merret, J.M.; Ansell, P.J. Journal of Aircraft 2023
Design and Characterization of High-Lift Capabilities for Slotted, Natural-Laminar-Flow Airfoils Ortiz-Melendez, H.D.; Long, E.; Colletti, C.; Toth, G.; Perkins, C.; Keely, K.; Ansell, P.J.; Coder, J.G. Journal of Aircraft 2023
Airfoil Morphed Leading-Edge Design for High-Lift Applications Using Genetic Algorithm Colletti, C.; Ansell, P.J. Journal of Aircraft 2023
Design of Control-Assisted Transonic Pressure Recovery Profiles Using Vortex Generators Collazo Garcia, A.; Ansell, P.J. AIAA Journal 2022
Multi-Domain Modeling and Simulation of High-Temperature Superconducting Transmission Lines Under Short-Circuit Fault Conditions Podlaski, M.; Vanfretti, L.; Khare, A.; Sumption, M.; Ansell, P.J. IEEE Transactions on Transportation Electrification 2022
On the H-type Transition to Turbulence — Laboratory Experiments and Reduced-Order Modeling Cheng, S.; Chamorro, L.P.; Ansell, P.J. Physics of Fluids 2021
Flight Trajectory Optimization of Sailplane After Rope Break Collazo Garcia, A.; Ranjan, P.; Chen, K.J.; James, K.A.; Ansell, P.J. Journal of Aircraft 2021
Aeropropulsive Coupling Effects on a General-Aviation Aircraft with Distributed Electric Propulsion Perry, A.T.; Bretl, T; Ansell, P.J. Journal of Aircraft 2021
Experimental Characterization of a Novel Cyclotronic Plasma Actuator Hristov, G.; Ansell, P.J.; Zimmerman, J.W.; Carroll, D.L. AIAA Journal 2020
Flow Evolution and Unsteady Spectra of Dynamic Stall at Transitional Reynolds Numbers Gupta, R.; Ansell, P.J. AIAA Journal 2020
Influence of Aspect Ratio on Dynamic Stall of a Finite Wing Andreu Angulo, I.; Ansell, P.J. AIAA Journal 2019
Characterization of a Griffith-Type Transonic, Laminar-Flow Airfoil Collazo Garcia, A.; Ansell, P.J. Journal of Aircraft 2019
Multi-Scale Vortex Characteristics of Dynamic Stall from Empirical Mode Decomposition Ansell, P.J.; Mulleners, K. AIAA Journal (Invited) 2019
Mission Analysis and Emissions for Conventional and Hybrid-Electric Commercial Transport Aircraft Wroblewski, G.E.; Ansell, P.J. Journal of Aircraft 2019
Unsteady Flow Physics of Airfoil Dynamic Stall Gupta, R.; Ansell, P.J. AIAA Journal 2019
Optimal Hyperelliptic Cambered Span Configurations for Minimum Drag Ranjan, P.; Ansell, P.J.; James, K.  Journal of Aircraft 2019
Mission Analysis and Component-Level Sensitivity Study of Hybrid-Electric General Aviation Propulsion Systems Dean, T.S.; Wroblewski, G.E.; Ansell, P.J. Journal of Aircraft 2018
Fast and Adaptive Empirical Mode Decomposition for Multidimensional, Multivariate Signals Thirumalaisamy, M.R.; Ansell, P.J. IEEE Signal Processing Letters 2018
Aero-Propulsive and Propulsor Cross-Coupling Effects on a Distributed Propulsion System Perry, A.T.; Ansell, P.J.; Kerho, M.F. Journal of Aircraft 2018
Influence of Freestream Velocity on Tilt-Rotor Fountain Effect Hong, J.; Ansell, P.J. Journal of Aircraft 2018
Computational Analysis of Vortex Wakes Without Near-Field Rollup Characteristics Ranjan, P.; Ansell, P.J. Journal of Aircraft 2018
Post-Stall Hysteresis and Flow Field Unsteadiness on a NACA 0012 Airfoil Hristov, G.; Ansell, P.J. AIAA Journal 2018
Closed-Loop Trailing-Edge Separation Control System using Empirical Mode Decomposition Gupta, R.; Ansell, P.J. AIAA Journal 2018
Crossflow Fan Power Requirements for Boundary-Layer Suction in Transonic Flow Perry, A.T.; Ansell, P.J. Journal of Aircraft 2017
Prediction and Experimental Evaluation of Planar Wing Spanloads for Minimum Drag Wroblewski, G.E.; Ansell, P.J. Journal of Aircraft 2017
Separation of Unsteady Scales in a Mixing Layer using Empirical Mode Decomposition Ansell, P.J.; Balajewicz, M.J. AIAA Journal 2017
Unsteady Modes in the Flowfield about an Airfoil with a Horn-Ice Shape Ansell, P.J.; Bragg, M.B. Journal of Aircraft 2016
Characterization of Low-Frequency Oscillations in the Flowfield about an Airfoil with a Horn-Ice Shape Ansell, P.J.; Bragg, M.B. AIAA Journal 2015
Application of a Hinge-Moment-Based Envelope Protection System on a Wing Ansell, P.J.; Kerho, M.F.; Bragg, M.B. Journal of Aircraft 2014
A Study of Burst Wakes in a Multi-Element Airfoil Flowfield Pomeroy, B.W.; Diebold, J.M.; Ansell, P.J.; Selig, M.S. AIAA Journal 2014
Measurement of Unsteady Flow Reattachment on an Airfoil with a Leading-Edge Ice Shape Ansell, P.J.; Bragg, M.B. AIAA Journal 2014
Stall Warning Using Flap Hinge Moment Measurements Ansell, P.J.; Bragg, M.B.; Kerho, M.F. Journal of Aircraft 2011

Title Authors Conference Year
Jet-Wake Axial and Swirling Flow Characteristics of Ducted and Unducted Propulsors Kopperstad, T.E.; Ansell, P.J. AIAA Scitech Forum 2024
High-Lift Aerodynamics of Integrated Distributed Propulsion Systems with Thrust Vectoring Jois, H.; Hong, A.S.; Ansell, P.J. AIAA Scitech Forum 2024
Design of Laminar-Flow Airfoils Based on Boundary-Layer Integral Parameters Collazo Garcia, A.; Ansell, P.J. AIAA Scitech Forum 2023
Aerodynamic Analysis of Lifting-Fuselage Configurations Mahesh, K.; Shah, A.; Ansell, P.J. AIAA Aviation Forum 2023
Airfoil Performance Sensitivity to Laminar Separation Bubble Topology Patel, Y.; Ansell, P.J. AIAA Aviation Forum 2023
Preliminary Design and Optimization of a Hydrogen-Electric Aircraft Concept Ranjan, P.; Das, G.K.; Waddington, E.; Lauer, M.G.; Ansell, P.J.; James, K. AIAA Aviation Forum 2023
Required Developments for Integration of Sustainable Hydrogen in Aviation Ansell, P.J. AIAA Aviation Forum 2023
Airfoils Design for the Low Reynolds Number Application in Rotors Patel, Y.; Ansell, P.J.; Lim, J.W.; Barr, S.M.; Weathers, T.; Alexanderoni, S.; Klein, Y.; Julius, S.E.; Abramov, D. AIAA Aviation Forum 2023
Acoustics of a Rotary Wing with Passive Reduced Tip Vortex in a Static Configuration Diaz, M.; Yu, D.; Ansell, P.J.; Saxton-Fox, T. AIAA Scitech Forum 2023
Investigating Fluidic Oscillators Embedded in a Slotted-Natural Laminar Flow Airfoil for High-Lift Applications Colletti, C.; Ansell, P.J. AIAA Scitech Forum 2023
Crossflow Interactions of Inclined Fluidic Oscillator Jets Awate, V.G.; Ansell, P.J. AIAA Scitech Forum 2023
Steady versus Unsteady Pneumatic Flow Control and Aspects of Practical Integration Shmilovich, A.; Khodadoust, A.; Colletti, C.; Ansell, P.J. AIAA Aviation Forum 2023
Hybridization Impact on Emissions for Hydrogen Fuel-Cell/Turbo-Electric Aircraft Waddington, E.; Jois, H.; Lauer, M.G.; Patel, Y.; Ansell, P.J. AIAA Aviation Forum 2023
Trade-Space Assessment of Liquid Hydrogen Propulsion Systems for Electrified Aircraft White, A.S.; Waddington, E.; Greitzer, E.M.; Merret, J.M.; Ansell, P.J.; Hall, D.K. AIAA Aviation Forum 2023
Design of Propellers with Passive Mitigation of Coherent Tip Vortex Roll-up Kopperstad, T.E.; Borra, A.; Beusse, A.; Kim, C.; Torres De Jesus, E.; Saxton-Fox, T.; Ansell, P.J. AIAA Scitech Forum 2023
Analytical Framework for Design of Aero-Propulsive Geometries with Powered Wakes Jois, H.; Ansell, P.J. AIAA Scitech Forum 2023
Plasma-Assisted Burner Array Development using Cyclotronic Arc-Plasma Actuators Zimmerman, J.W.; Carroll, D.L.; Hristov, G.; Ansell, P.J. AIAA Scitech Forum 2022
Lifting Line Framework for Optimization of Rotary Wing Systems Patel, Y.; Ansell, P.J. AIAA Scitech Forum 2022
Swirl Characterization of a Cyclotronic Arc Plasma Actuated Axial Air Jet Hristov, G.; Ansell, P.J.; Zimmerman, J.W.; Carroll, D.L. AIAA Scitech Forum 2022
Airfoil Design Framework for Optimized Boundary-Layer Parameters Collazo Garcia, A.; Ansell, P.J. AIAA Aviation Forum 2022
Design and Analysis of Phononic Material for Passive Flow Control Park, S.; Hristov, G.; Balasubramanian, S.; Goza, A.; Ansell, P.J.; Matlack, K. AIAA Aviation Forum 2022
System-Level Utilization of Low-grade, MW-scale Thermal Loads for Electric Aircraft White, A.S.; Waddington, E.; Merret, J.M.; Gretizer, E.M.; Ansell, P.J.; Hall, D.K. AIAA Aviation Forum 2022
A Parametrization Framework for Multi-Element Airfoil Systems Using Bézier Curves Lauer, M.G.; Ansell, P.J. AIAA Aviation Forum 2022
Aerodynamic Shape Optimization of a Transonic, Propulsion-Airframe-Integrated Airfoil System Lauer, M.G.; Ansell, P.J. AIAA Aviation Forum 2022
Modal Analysis of the Transonic Shock Process over a Griffith-Type, Laminar-Flow Airfoil Collazo Garcia, A. Saxton-Fox, T.; Ansell, P.J. AIAA Scitech Forum 2021
Multi-Domain Modeling for High Temperature Superconducting Components for the CHEETA Hybrid Propulsion Power System Podlaski, M.; Khare, A.; Vanfretti, L.; Sumption, M.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium (EATS) 2021
Design of Assisted Transonic Pressure Recovery using Passive Flow Control for Airfoil Geometries Collazo Garcia, A.; Ansell, P.J. AIAA Scitech Forum 2021
Design of an Airfoil Morphing Leading Edge for High-Lift Applications using a Genetic Algorithm Colletti, C.; Ansell, P.J. AIAA Scitech Forum 2021
Aero-propulsive Integration Effects of an Overwing Distributed Electric Propulsion System Yu, D.; Ansell, P.J.; Hristov, G. AIAA Scitech Forum 2021
Impact of LH2 Fuel Cell-Electric Propulsion on Aircraft Configuration and Integration Waddington, E.; Merret, J.M.; Ansell, P.J. AIAA Aviation Forum 2021

Hybrid-Electric Breguet Range Equation: Development & Validation Against a Hybrid-Electric Aircraft Simulation

Wroblewski, G.E.; Ansell, P.J. AIAA Propulsion and Energy Forum 2020

A Bréguet Range Equation for Hybrid-Electric Jet Aircraft Sizing and Analysis

Wroblewski, G.E.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium (EATS) 2020
Characterization of Inclined Oscillating Jet and Crossflow Interaction for Use in Active Flow Control Awate, V.G.; Ansell, P.J. AIAA Scitech Forum 2020
Initial Steps in Modeling of CHEETA Hybrid Propulsion Aircraft Vehicle Power Systems using Modelica Podlaski, M.; Vanfretti, L.; Khare, A.; Nademi, H.; Ansell, P.J.; Haran, K.S.; Balachandran, T. AIAA/IEEE Electric Aircraft Technologies Symposium (EATS) 2020
Flight Trajectory Optimization of a Sailplane after Rope Break during Tow-Assisted Takeoff Collazo, A.G.; Ranjan, P.; James, K.; Ansell, P.J. AIAA Aviation Forum (Invited) 2019
Hybrid-Electric Regional Jet Aircraft Operation Efficiency Wroblewski, G.E.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium 2019
Development and Validation of a Continuous, Open-Return Transonic Wind Tunnel Collazo, A.G.; Ansell, P.J. AIAA Aviation Forum 2019
Scaling Studies of Cyclotronic Plasma Actuators for Active Flow Control Applications Zimmerman, J.W.; Hristov, G.; Vahora, M.; Motz, M.; Richardson, D.R.; Ansell, P.J.; Carroll, D.L. AIAA Scitech Forum 2019
Circuit Studies for Cyclotronic Plasma Actuators Zimmerman, J.W.; Carroll, D.L.; Hristov, G.; Vahora, M.; Ansell, P.J. AIAA Aviation Forum 2019
System Identification and Dynamics Modeling of a Distributed Electric Propulsion Aircraft Perry, A.T.; Bretl, T.W.; Ansell, P.J. AIAA Aviation Forum 2019
Effect of Geometric Parameters and Flow Conditions on the Frequency of Fluidic Oscillators for Active Flow Control Colletti, C.; Awate, V.G.; Ansell, P.J. AIAA Scitech Forum 2019
High Lift Configuration of a Slotted Natural Laminar Flow Airfoil Twiss, D.; Colletti, C.; Ansell, P.J. AIAA Scitech Forum 2019
Design and Development of a Dynamically, Scaled Distributed Electric Propulsion Aircraft Testbed Pieper, K.; Perry, A.T.; Bretl, T.W.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium 2018
A Review of Distributed Electric Propulsion Concepts for Air Vehicle Technology Kim, H.; Perry, A.T.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium 2018
Mission Analysis and Emissions for Conventional and Hybrid-Electric Regional Jet Aircraft Wroblewski, G.E.; Ansell, P.J. AIAA/IEEE Electric Aircraft Technologies Symposium 2018
Configuration Studies for a Plasma Actuator Technique using Arc Breakdown in a Magnetic Field Zimmerman, J.W.; Carroll, D.L.; Hristov, G.; Ansell, P.J. Flow Control Conference 2018
Evaluation of a Griffith Type Transonic Laminar Flow Airfoil Collazo, A.G.; Ansell, P.J. Applied Aerodynamics Conference 2018
Development of a Plasma Actuator with Arc Breakdown in a Magnetic Field Zimmerman, J.W.; Hristov, G.; Carroll, D.L.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2018
Influence of Aspect Ratio on Dynamic Stall of a Finite Wing Angulo, I.A.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2018
Mission Analysis and Emissions for Conventional and Hybrid-Electric Commercial Transport Aircraft Wroblewski, G.E.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2018
Mission Analysis and Component-Level Sensitivity Study of Hybrid-Electric General Aviation Propulsion Systems Dean, T.S.; Wroblewski, G.E.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2018
Investigation of the Effects of Reynolds Number on the Unsteady Flow Physics of Airfoil Dynamic Stall Gupta, R.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2018
Aero-Propulsive and Propulsor Cross-Coupling Effects on a Distributed Propulsion System Perry, A.T.; Ansell, P.J.; Kerho, M.F. AIAA Aerospace Sciences Meeting 2018
Plasma Actuator with Arc Breakdown in a Magnetic Field for Active Flow Control Applications Zimmerman, J.W.; Palla, A.D.; Carroll, D.L.; Hristov, G.K.; Ansell, P.J. AIAA Plasmadynamics and Lasers Conference 2017
Unsteady Flow Physics of Airfoil Dynamic Stall Gupta, R.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2017
Post-Stall Hysteresis and Flow Field Unsteadiness on an NACA 0012 Airfoil Hristov, G.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2017
Design, Analysis, and Evaluation of a Propulsive Wing Concept Perry, A.T.; Ansell, P.J.; Ananda, G.; D’Urso, S.; Kerho, M.F. AIAA Applied Aerodynamics Conference 2016
Open-Loop and Closed-Loop Trailing-Edge Separation Control on a Natural Laminar Flow Airfoil Gupta, R.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2016
Prediction and Experimental Evaluation of Planar Wing Spanloads for Minimum Drag Wroblewski, G.E.; Ansell, P.J. AIAA Aerospace Sciences Meeting 2016
Unsteady Modes in the Flowfield about an Airfoil with a Horn-Ice Shape Ansell, P.J.; Bragg, M.B. AIAA Fluid Dynamics Conference 2014
Characterization of Ice-Induced Low-Frequency Flowfield Oscillations and their Effect on Airfoil Performance Ansell, P.J.; Bragg, M.B. AIAA Applied Aerodynamics Conference 2013
A Study of Burst Wakes in a Multielement Airfoil Flowfield Pomeroy, B.W.; Ansell, P.J.; Diebold, J.M.; Selig, M.S. AIAA Applied Aerodynamics Conference 2013
Measurement of Unsteady Flow Reattachment on an Airfoil with a Leading-Edge Ice Shape Ansell, P.J.; Bragg, M.B. AIAA Applied Aerodynamics Conference 2012
Envelope Protection System for Iced Airfoils Using Flap Hinge Moment Ansell, P.J.; Bragg, M.B.; Kerho, M.F. SAE International Conference on Aircraft and Engine Icing and Ground Deicing 2011
Envelope Protection System Using Flap Hinge Moment Measurements Ansell, P.J.; Bragg, M.B.; Kerho, M.F. AIAA Applied Aerodynamics Conference 2010

Title Author Type Year
Multi-Fidelity Analysis and Reduced-Order Modeling of Wing-Body Aerodynamics Mahesh, K. M.S. Thesis 2024
Investigating the Impact of Coupled High-Lift Devices on Natural Laminar Flow Airfoils Colletti, C. Ph.D. Dissertation 2023
Airfoil Design Framework for Optimized Boundary-Layer Integral Parameters Collazo, A.G. Ph.D. Dissertation 2022
Flow Physics and Air Interactions of Magnetically Driven Plasma Discharges Hristov, G. Ph.D. Dissertation 2022
Modeling Hybrid-Electric Regional Jet Aircraft Performance & Emissions Reduction Potential Wroblewski, G.E. Ph.D. Dissertation 2022
Aero-propulsive Characteristics of an Overwing Distributed Electric Propulsion System with Vectored Thrust Yu, D. M.S. Thesis 2021
Experimental and Computational Investigation of the Transonic Aero-propulsive Interactions of an Overwing Ducted Fan Lauer, M.G. M.S. Thesis 2021
Unsteady Flow Physics of Airfoil Dynamics Stall Gupta, R. Ph.D. Dissertation 2020
The Effects of Aero-propulsive Coupling on Aircraft with Distributed Propulsion Systems Perry, A.T. Ph.D. Dissertation 2020
Characterization of Inclined Oscillating Jets and Crossflow Interaction for Use in Active Flow Control Awate, V.G. M.S. Thesis 2020
Aerodynamic Characterization of a Griffith-Type Transonic, Laminar-flow Airfoil Collazo, A.G. M.S. Thesis 2019
Investigating the Frequency Behavior of Fluidic Oscillators and Their Application as Active Flow Control for an SNLF Airfoil Colletti, C. M.S. Thesis 2019
Analysis of Fountain Effect for Tiltrotor Configuration using Computational Fluid Simulation and Experimental Method Hong, J. M.S. Thesis 2017
Post-Stall Hysteresis and Flow Field Unsteadiness on an NACA 0012 Airfoil Hristov, G. M.S. Thesis 2017
Design and Development of a Continuous, Open-Return Transonic Wind Tunnel Facility Gray, C. M.S. Thesis 2017
Computational Analysis of Planar Wings Designed for Optimum Span-load Ranjan, P. M.S. Thesis 2016
Experimental Evaluation of a Propulsive Wing Concept Perry, A.T. M.S. Thesis 2016
Open-loop and Closed-loop Trailing-edge Separation Control on a Natural Laminar Flow Airfoil Gupta, R. M.S. Thesis 2016
Prediction and Experimental Evaluation of Planar Wing Spanloads for Minimum Drag Wroblewski, G.E. M.S. Thesis 2016
Unsteady Modes in the Flowfield About an Airfoil with a Leading-Edge Horn-Ice Shape Ansell, P.J. Ph.D. Dissertation 2013
Flight Envelope Protection Using Flap Hinge Moment Measurement Ansell, P.J. M.S. Thesis 2010

Title Authors Magazine Year
Welcome to the Special Issue on Hydrogen-Electric Aircraft Technologies [Guest Editors] Ansell, P.J.; Haran, K.S.; Laskaridis, P. IEEE Electrification Magazine 2022
Hydrogen-Electric Aircraft Technologies and Integration: Enabling an Environmentally Sustainable Aviation Future Ansell, P.J. IEEE Electrification Magazine 2022
CHEETA: An All-Electric Aircraft Takes Cryogenics and Superconductivity on Board: Combatting Climate Change Stautner, W.; Ansell, P.J.; Haran, K.S. IEEE Electrification Magazine 2022
Revealing the Secrets of Dynamic Stall Processes Fenlason, J.; Ansell, P.J. Aerospace Testing International Magazine 2021
Electrified Airplanes: A Path to Zero-Emission Air Travel Ansell, P.J.; Haran, K.S. IEEE Electrification Magazine 2020
Distributed Electric Propulsion Ansell, P.J. Aerospace Testing International Magazine  2018

Title Authors Publisher Year
Preparing Your Aircraft for Electric Aircraft and Hydrogen Technologies Le Bris, G.; Nguyen, L.; Tagoe, B.; Jonat, P.; Justin, C.Y.; Reindel, E.; Preston, K.B.; Ansell, P.J. Transportation Research Board 2022

Title Authors Publisher Year
Practical Applications for Emerging Plasma-Assisted Combustion Technology Zimmerman, J.W.; Halton-Berns, J.; Carroll, D.L.; Hristov, G.; Ansell, P.J. U.S. Department of Energy — Office of Scientific and Technical Information 2021
Center for High-Efficiency Electrical Technologies for Aircraft (CHEETA) Datta, K. Ansell, P.J. NASA — Headquarters 2021
Understanding Nonlinear Coherent Structure Interactions in Boundary-Layer Transition using Adaptive Signal Analysis Ansell, P.J. U.S. Department of Defense — Defense Technical Information Center 2021
Progress in Distributed Electric Propulsion Vehicles and Technologies Kim, H.D.; Perry, A.T.; Ansell, P.J. NASA — Armstrong Flight Research Center 2020
The Onset of Dynamic Stall: Understanding Flowfield Unsteadiness to Enable Closed-Loop Control Ansell, P.J. U.S. Department of Defense — Defense Technical Information Center 2019