Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Aerospace Engineering (38)
- Physical Sciences and Mathematics (33)
- Electrical and Computer Engineering (31)
- Computer Engineering (20)
- Physics (17)
-
- Materials Science and Engineering (14)
- Navigation, Guidance, Control and Dynamics (13)
- Computer Sciences (11)
- Digital Communications and Networking (11)
- Signal Processing (10)
- Aviation (9)
- Electromagnetics and Photonics (9)
- Fluid Dynamics (9)
- Engineering Science and Materials (8)
- Information Security (7)
- Mechanical Engineering (7)
- Operations Research, Systems Engineering and Industrial Engineering (7)
- Systems and Communications (7)
- Aerodynamics and Fluid Mechanics (6)
- Space Vehicles (6)
- Computer and Systems Architecture (5)
- Nuclear Engineering (5)
- Optics (5)
- Other Materials Science and Engineering (5)
- Aeronautical Vehicles (4)
- Chemistry (4)
- Civil and Environmental Engineering (4)
- Controls and Control Theory (4)
- Management and Operations (4)
- Keyword
-
- Center_CCR (14)
- Computational Fluid Dynamics (8)
- Cybersecurity (4)
- Additive Manufacturing (3)
- Blockchain (3)
-
- Boundary Layer (3)
- Fluid Dynamics (3)
- #antcenter (2)
- Algorithms (2)
- Ceramic Matrix Composites (2)
- Chemiluminescence (2)
- Collision Avoidance Systems (2)
- Combustion (2)
- Composite Materials (2)
- Creep Tests (2)
- Drag (2)
- Electric Propulsion (2)
- Electro-optical (2)
- Failure Mode and Effect Analysis (2)
- Geolocation (2)
- Heat Transfer (2)
- Infrared (2)
- Jet Engines (2)
- Low Earth Orbits (2)
- Machine learning (2)
- Maneuvers (2)
- Neural networks (2)
- Optimization (2)
- Physical Properties (2)
- Reliability (2)
Articles 121 - 125 of 125
Full-Text Articles in Engineering
Application Of Metamaterials For Multifunctional Satellite Bus Enabled Via Additive Manufacturing, Michael A. Macchia
Application Of Metamaterials For Multifunctional Satellite Bus Enabled Via Additive Manufacturing, Michael A. Macchia
Theses and Dissertations
Space systems require materials with superior stiffness to weight ratios to provide structural integrity while minimizing mass. Additive manufacturing processes enable the design of metamaterials that exceed the performance of naturally occurring materials in addition to allowing the integration of non-structural functions. This research explored the use of a high stiffness, high density, small melt pool track width AM material, Inconel 718, to enable the production of metamaterials with finer features possible than can possibly be created using a lower density aluminum alloy material. Various metamaterials were designed utilizing thin wall triply periodic minimal surface infilled sandwich structures. The performance …
Optical And Electron Paramagnetic Resonance Characterization Of Point Defects In Semiconductors, Elizabeth M. Scherrer
Optical And Electron Paramagnetic Resonance Characterization Of Point Defects In Semiconductors, Elizabeth M. Scherrer
Theses and Dissertations
Point defects in two semiconductor materials, both with promising optical properties, are investigated. The first material, CdSiP2, is a nonlinear optical material in which absorption bands due to point defects can hinder performance when used in frequency conversion applications in the infrared. The second material, Sn2P2S6, is a photorefractive material where point defects with specific properties are needed to optimize response in dynamic holography applications. Electron paramagnetic resonance (EPR) spectroscopy is used to identify the electronic structure of defects and their charge states. Correlations between EPR spectra and optical absorption allow assignments …
Nuclear Data Covariance Analysis Of An Energy Tuning Assembly For Simulating Nuclear Weapon Environments, Nicholas J. Quartemont
Nuclear Data Covariance Analysis Of An Energy Tuning Assembly For Simulating Nuclear Weapon Environments, Nicholas J. Quartemont
Theses and Dissertations
An energy tuning assembly was characterized to spectrally shape the National Ignition Facility neutron source to a notional thermonuclear and prompt fission neutron spectrum to approximate a boosted nuclear device. This research performed nuclear data covariance analysis to predict the performance of the energy tuning assembly to create the objective spectrum, assessed anticipated experimental outcomes, and determine the fission products produced in a highly enriched uranium foil in the sample cavity. Nuclear data covariance impacted the neutron fluence energy distribution by a few percent for a large energy range of the neutron fluence. Neutron flux unfolding techniques provided broad spectral …
Evaluation Of Unmanned Aircraft Flying Qualities Using A Stitched Learjet Model, Patrick M. Callaghan
Evaluation Of Unmanned Aircraft Flying Qualities Using A Stitched Learjet Model, Patrick M. Callaghan
Theses and Dissertations
In recent years, military UAVs have taken over missions that were too dull, dirty, or dangerous for manned aircraft. The increased demand has led to a build-fly-fix-fly development mentality, plaguing the early lifecycle with staggering mishap rates. Currently, MIL-STD-1797 lists flying qualities for UAVs as TBD, and the standards for manned fixed wing are inadequate when applied to UAVs. In an effort to expand the database of UAV flying qualities, an analysis was completed on a Simulink model of an LJ-25D developed from Calspans Variable Stability System aircraft at the United States Test Pilot School. Three maneuvers were simulated: (1) …
Magnetic Field Aided Indoor Navigation, William F. Storms
Magnetic Field Aided Indoor Navigation, William F. Storms
Theses and Dissertations
This research effort examines inertial navigation system aiding using magnetic field intensity data and a Kalman filter in an indoor environment. Many current aiding methods do not work well in an indoor environment, like aiding using the Global Positioning System. The method presented in this research uses magnetic field intensity data from a three-axis magnetometer in order to estimate position using a maximum – likelihood approach. The position measurements are then combined with a motion model using a Kalman filter. The magnetic field navigation algorithm is tested using a combination of simulated and real measurements. These tests are conducted using …