Open Access. Powered by Scholars. Published by Universities.®
- Institution
-
- University of Central Florida (301)
- Air Force Institute of Technology (107)
- University of Arkansas, Fayetteville (79)
- California Polytechnic State University, San Luis Obispo (73)
- Missouri University of Science and Technology (53)
-
- University of New Mexico (30)
- Old Dominion University (25)
- University of Massachusetts Amherst (24)
- University of Kentucky (23)
- University of Texas at El Paso (22)
- William & Mary (20)
- University of South Florida (19)
- University of Tennessee, Knoxville (18)
- Michigan Technological University (15)
- Clemson University (14)
- Western University (14)
- Southern Methodist University (13)
- University of Mississippi (13)
- University of Wisconsin Milwaukee (11)
- Virginia Commonwealth University (11)
- Purdue University (10)
- Portland State University (8)
- City University of New York (CUNY) (7)
- Georgia Southern University (7)
- Louisiana State University (6)
- Louisiana Tech University (6)
- The University of Maine (6)
- West Virginia University (6)
- Western Michigan University (6)
- Boise State University (5)
- Keyword
-
- Applied sciences (21)
- Optics (21)
- Antenna (18)
- Metamaterials (18)
- Photonics (17)
-
- Antennas (16)
- Nonlinear optics (16)
- Pure sciences (16)
- Electromagnetics (15)
- Plasmonics (15)
- Laser (14)
- Radar (13)
- Liquid crystal (11)
- Metamaterial (10)
- Semiconductor lasers (10)
- Computational Electromagnetics (9)
- Microwave (9)
- Optoelectronics (9)
- Semiconductor (9)
- Electromagnetic (8)
- Electromagnetic waves--Scattering (8)
- Polarization (8)
- 3D Printing (7)
- 3D printing (7)
- GeSn (7)
- Graphene (7)
- Lasers (7)
- Optimization (7)
- Semiconductors (7)
- Simulation (7)
- Publication Year
- Publication
-
- Electronic Theses and Dissertations (304)
- Theses and Dissertations (135)
- Graduate Theses and Dissertations (65)
- Doctoral Dissertations (55)
- Masters Theses (48)
-
- Master's Theses (38)
- Electronic Theses and Dissertations, 2020- (32)
- Electrical Engineering (27)
- Electrical and Computer Engineering ETDs (22)
- Open Access Theses & Dissertations (22)
- Dissertations, Theses, and Masters Projects (20)
- Theses and Dissertations--Electrical and Computer Engineering (20)
- USF Tampa Graduate Theses and Dissertations (19)
- Dissertations, Master's Theses and Master's Reports (14)
- Electrical Engineering Undergraduate Honors Theses (14)
- Electronic Thesis and Dissertation Repository (14)
- Dissertations and Theses (12)
- Electrical Engineering Theses and Dissertations (11)
- Electrical & Computer Engineering Theses & Dissertations (10)
- All Theses (8)
- Open Access Dissertations (8)
- Physics Theses & Dissertations (8)
- All Dissertations (6)
- Graduate Theses, Dissertations, and Problem Reports (6)
- Mechanical & Aerospace Engineering Theses & Dissertations (6)
- Boise State University Theses and Dissertations (5)
- Dissertations (5)
- LSU Doctoral Dissertations (5)
- Optical Science and Engineering ETDs (5)
- Legacy Theses & Dissertations (2009 - 2024) (4)
Articles 991 - 1020 of 1023
Full-Text Articles in Engineering
Analysis And Interpretation Of Ion Data Associated With Neutral Gas Releases In The Earth's Ionosphere, Timothy M. Shadid
Analysis And Interpretation Of Ion Data Associated With Neutral Gas Releases In The Earth's Ionosphere, Timothy M. Shadid
Theses and Dissertations
Barium and strontium release experiments were conducted throughout 1991 from the Combined Release and Radiation Effects Satellite (CRRES) to study both natural and man-made disturbances in the earth's ionosphere. A mass spectrometer on the spacecraft counted the Ba and Sr ions as the cloud expanded. In this study, data from the G-1 (in sunlight) and G-11b (in darkness) releases were modeled to understand the source of the ion signals. The model reproduced the Ba+ sun data well assuming photoionization (τ = 28 s) was the primary ionization mechanism. However, it was not able to account for the remaining ion …
Two-Wavelength Neodymium Based Lasers, Scott H. Mccracken
Two-Wavelength Neodymium Based Lasers, Scott H. Mccracken
Theses and Dissertations
A dual wavelength Q switched laser cavity has been successfully designed and assembled to evaluate the new neodymium (Nd) based materials. Initial characterization has been achieved for Nd:YAG and Nd:YLF. The results indicate that for a fixed pulse repetition frequency, the delay time can be used to adjust the relative energy between the 1.06 and 1.32 micrometer pulses. Any deficiency in the performance of one transition can be made up by performance in the other simply by changing the relative amount of time the population inversion is allowed to build up for each pulse. The best performance was obtained using …
Tolerance Theory Of Periodic Surfaces, James A. Godsey
Tolerance Theory Of Periodic Surfaces, James A. Godsey
Theses and Dissertations
Two formulations for the far field statistical average power pattern of a strip grating with errors in strip and slit width are presented. The first formulation utilizes the Born approximation in which the unknown aperture fields are replaced by the incident fields. The second formulation utilizes an approximation which satisfies the edge condition. Approximations for the scattered fields are first derived using PEC surface equivalence for a TEz polarized plane wave incident upon a strip grating consisting of an infinite PEC screen cut by a number of infinitely long slits. Babinet's principle is then used to obtain approximations for the …
Scattering From Finite By Infinite Periodic Arrays With Arbitrary Piecewise-Linear Slot Elements, Paul R. Barre
Scattering From Finite By Infinite Periodic Arrays With Arbitrary Piecewise-Linear Slot Elements, Paul R. Barre
Theses and Dissertations
A numerical model for analyzing electromagnetic scattering from a planar Frequency Selective Surface (FSS) is developed. The model can represent an FSS with multiple arrays of arbitrary piecewise linear scatterers in a stratified dielectric medium. The FSS's arrays are finite by infinite, accounting for edge effects, where a periodic array element is formed from the piecewise linear connection of thin slots in a groundplane. The stratified dielectric medium is defined as an arbitrary stack of lossless dielectric slabs that sandwich the user defined arrays, simulating an FSS. The Surface Equivalence theorem is used to construct an equivalent problem based on …
Design And Characterization Of Resonant Cavity Light-Emitting Diodes, Thomas M. Fitzgerald
Design And Characterization Of Resonant Cavity Light-Emitting Diodes, Thomas M. Fitzgerald
Theses and Dissertations
This thesis describes an investigation into the emission properties of Resonant Cavity Light Emitting Diodes (RCLED). RCLEDs are a new photonic device that promise laser-like properties of narrow output frequency spread and high output power, without the usual laser disadvantages of shorter lifetime and increased maintenance and lifetime costs. Specifically, this thesis examines the functional dependence between emitted wavelength and the RCLED microcavity, and attempts to correlate theory with experimental data. This thesis introduces a classical wave interference model that calculates the Spontaneous Emission Enhancement Factor (Z-) with angular dependence.
Frame Selection Performance Limits For Statistical Image Reconstruction Of Adaptive Optics Compensated Images, Stephen D. Ford
Frame Selection Performance Limits For Statistical Image Reconstruction Of Adaptive Optics Compensated Images, Stephen D. Ford
Theses and Dissertations
The U.S. Air Force uses adaptive optics systems to collect images of extended objects beyond the atmosphere. These systems use wavefront sensors and deformable mirrors to compensate for atmospheric turbulence induced aberrations. Adaptive optics greatly enhance image quality; however, wavefront aberrations are not completely eliminated. Therefore, post-detection processing techniques are employed to further improve the compensated images. Typically, many short exposure images are collected, recentered to compensate for tilt, and then averaged to overcome randomness in the images and improve signal-to-noise ratio. Experience shows that some short exposure images in a data set are better than others. Frame selection exploits …
Spectroscopic And Vibrational Energy Transfer Studies In Molecular Bromine, Courtney D. Holmberg
Spectroscopic And Vibrational Energy Transfer Studies In Molecular Bromine, Courtney D. Holmberg
Theses and Dissertations
Vibrational transfer and electronic quenching in the lower vibrational levels (v' < 3) of the B3π(0u+) state of 79Br2 were investigated using spectrally resolved, temporally resolved laser induced fluorescence techniques. Spectrally resolved emissions from collisionally populated Br2(B) vibrational levels were observed for Br2 and rare gas collision partners. Vibrational transfer was efficient in the non-predissociative vibrational levels and was adequately described by the Montroll-Shuler model for harmonic oscillators. A single fundamental rate coefficient for vibrational transfer from v' = 1 to v' = 0, kv(1,0), characterizes vibrational relaxation. For Br2, the …
Electrical Properties Of P-Type Gainp2, Roy S. Calfas
Electrical Properties Of P-Type Gainp2, Roy S. Calfas
Theses and Dissertations
The GaInP2 n+—p junction diode has recently become important to the development of high efficiency GaInP2GaAs dual junction solar cells, which have a demonstrated air mass 1.5 conversion efficiencies in excess of 27. In order to study the effects of long term exposure to the space environment, the GaInP2 n+—p junction diodes were irradiated with a 1 MeV electron beam with a fluence of 1016 electrons/cm2. Since little is known about deep level defects traps in GaInP2, a deep level transient spectroscopy DLTS study was made to characterize the …
Object Imaging Accomplished With An Integrated Circuit Robotic Tactile Sensor Incorporating A Piezoelectric Polyvinylidene Fluoride Thin Film, John M. Emmert
Object Imaging Accomplished With An Integrated Circuit Robotic Tactile Sensor Incorporating A Piezoelectric Polyvinylidene Fluoride Thin Film, John M. Emmert
Theses and Dissertations
The purpose of this research effort was to investigate the performance of a piezoelectric tactile sensor design and appropriately refine it. The sensor was fabricated from an 8 x 8 electrode array MOS integrated circuit. Each taxel in the array was 400 microns x 400 microns. A 6 mm x 6 mm piece of piezoelectric polyvinylidene fluoride was adhered to the electrode array using a urethane dielectric adhesive to form the active sensing area of the sensor. An amplifier was investigated to enhance the range of the tactile sensor's output signal. The amplifier is a high input' impedance differential amplifier …
Study Of Single-Electron Capture From He, Ne And Ar By Low-Energy Ne^Q+ Recoil Ions Using Translational Energy Spectroscopy, Renad Qubaj-Said
Study Of Single-Electron Capture From He, Ne And Ar By Low-Energy Ne^Q+ Recoil Ions Using Translational Energy Spectroscopy, Renad Qubaj-Said
Masters Theses
No abstract provided.
Linear Characteristic Spatial Quadrature For Discrete Ordinates Neutral Particle Transport On Arbitrary Triangles, Dennis J. Miller
Linear Characteristic Spatial Quadrature For Discrete Ordinates Neutral Particle Transport On Arbitrary Triangles, Dennis J. Miller
Theses and Dissertations
A new discrete ordinates spatial quadrature for arbitrary triangular cells is derived and compared to its rectangular cell linear characteristic counterpart. The triangular mesh is more flexible, allowing curved surfaces and off-axis angles to be approximated with many fewer spatial cells. The triangle method is consistently more accurate on example problems tested here. Arbitrary orientation and size of the triangles allow non-patterned meshes to be developed which appears to ameliorate numerical diffusion. The triangle linear characteristic quadrature converges at nearly the same rate as rectangular Linear characteristic on Lathrop's problem. Mesh sensitivity measurements show large variations in triangle vertex locations …
Inhibited Spontaneous Emission By Photonic Band Gaps In A Square Lattice Of Periodic Dielectric Medium, Abdullah Al-Ghamdi
Inhibited Spontaneous Emission By Photonic Band Gaps In A Square Lattice Of Periodic Dielectric Medium, Abdullah Al-Ghamdi
Masters Theses
The concepts of band theory for electrons can be employed to describe the behavior of electromagnetic waves propagating in two-dimensional, periodic dielectric structures. These two-dimensional, periodic structures can produce photonic band gaps in which the spontaneous emission by atoms embedded in the structure is prohibited and as a result the performance of many semiconductor devices can be enhanced. The calculations are based on finding the eigenvalues of the algebraic equation for the frequencies of electromagnetic waves moving in a square lattice composed of square dielectric rods with different dielectric constants.
Electromagnetic Field Variations In The Activation Of Bone Cell Synthesis, Gary Ketcherside
Electromagnetic Field Variations In The Activation Of Bone Cell Synthesis, Gary Ketcherside
Loma Linda University Electronic Theses, Dissertations & Projects
[Abstract Not Included]
A Lagrangian For A System Of Two Dyons, Rainer Georg Thierauf
A Lagrangian For A System Of Two Dyons, Rainer Georg Thierauf
Dissertations and Theses
Maxwell's equations for the electromagnetic field are symmetrized by introducing magnetic charges into the formalism of electrodynamics. The symmetrized equations are solved for the fields and potentials of point particles. Those potentials, some of which are found to be singular along a line, are used to formulate the Lagrangian for a system of two dyons (particles with both electric and magnetic charge). The equations of motion are derived from the Lagrangian. It is shown that the dimensionality constants k and k * , which we r e introduced to define the units of the electromagnetic fields, have to be equal …
Effects On Electrolytic Cells Of Magnetic Fields Applied To Single Electrodes, Craig Allen Cousins
Effects On Electrolytic Cells Of Magnetic Fields Applied To Single Electrodes, Craig Allen Cousins
Dissertations and Theses
The primary goal of this research was to investigate the effects associated with the application of magnetic fields to single electrodes.
High Resolution Laser Absorption Spectroscopy Of Ozone Near 1129.4 Cm-1, Lawrence N. Majorana
High Resolution Laser Absorption Spectroscopy Of Ozone Near 1129.4 Cm-1, Lawrence N. Majorana
Physics Theses & Dissertations
A Beer's Law experiment was performed with a tunable laser to determine self broadened line shape parameters of one infrared absorption ozone line in the v1 band for ten pressures from 0.26 to 6.29 Torr at 285K. SO2 line positions were used for wavelength calibration. Line shapes were iteratively fitted to the Voigt function at a Doppler width of 29.54 MHz (HWHM) resulting in values for the integrated line• strength, ( S), of (0.144 +/- 0.007 ) x ·10-20 cm-1/molecule cm-2, line center frequency, (υο) of 1129.426 cm-1 and the Lorentzian contributions to half width, (α …
Computer Aided Design For Fet Circuits, Iyad Ahmad Natour
Computer Aided Design For Fet Circuits, Iyad Ahmad Natour
Masters Theses
No abstract provided.
A Theoretical Investigation Of Electromagnetic Waves Obliquely Incident Upon A Plasma Slab, Calvin Thomas Swift
A Theoretical Investigation Of Electromagnetic Waves Obliquely Incident Upon A Plasma Slab, Calvin Thomas Swift
Dissertations, Theses, and Masters Projects
No abstract provided.
The Development Of An Instrument For Three Dimensional Analysis Of Micron Quantities Of Tooth Movement, M. Clark Lamberton
The Development Of An Instrument For Three Dimensional Analysis Of Micron Quantities Of Tooth Movement, M. Clark Lamberton
Loma Linda University Electronic Theses, Dissertations & Projects
In order to quantitate initial tooth movement in response to forces applied to the tooth crown, an instrument for intraoral use has been developed. The photomicrometer consists of nine photosensitive cells mounted in an assembly of two layers. Eight of the cells were mounted to form X and Y axes, top layer and bottom layer, to measure horizontal movements. The ninth cell was mounted in the center of the bottom layer and was used for alignment and for measurements in the Z or vertical axis. The photocell assembly was approximately 10 mm diameter and 6 mm high. This assembly when …
A Method For The Calculation Of The Electric Microfield Distribution In A System Of Charged Hard Spheres, Ronald M. Flegal
A Method For The Calculation Of The Electric Microfield Distribution In A System Of Charged Hard Spheres, Ronald M. Flegal
Masters Theses
No abstract provided.
The Development And Use Of A Double Beam Photoelectric Polarimeter For The Study Of The Faraday Effect, John Norman Rowe
The Development And Use Of A Double Beam Photoelectric Polarimeter For The Study Of The Faraday Effect, John Norman Rowe
Masters Theses
No abstract provided.
Investigation Of A Two-Dimensional Negative Resistance Oscillator, Leo Rogon
Investigation Of A Two-Dimensional Negative Resistance Oscillator, Leo Rogon
Dissertations, Theses, and Masters Projects
No abstract provided.
Nonlinear Response Of An Oscillating Discharge To Very High Frequency Signals, Daniel Burnley Raiford
Nonlinear Response Of An Oscillating Discharge To Very High Frequency Signals, Daniel Burnley Raiford
Dissertations, Theses, and Masters Projects
No abstract provided.
Some Considerations Of An Axial Arc In A Radial Magnetic Field, Philip Brockman
Some Considerations Of An Axial Arc In A Radial Magnetic Field, Philip Brockman
Dissertations, Theses, and Masters Projects
No abstract provided.
Bimodal-Cavity Measurement Of The Microwave Faraday Effect In A Gaseous Magnetoplasma, Maurice Terrell Raiford
Bimodal-Cavity Measurement Of The Microwave Faraday Effect In A Gaseous Magnetoplasma, Maurice Terrell Raiford
Dissertations, Theses, and Masters Projects
No abstract provided.
A Technique For Measuring The Electrical Conductivity Of Moving Conductors, Joseph Norwood
A Technique For Measuring The Electrical Conductivity Of Moving Conductors, Joseph Norwood
Dissertations, Theses, and Masters Projects
No abstract provided.
Thick Target Bremsstrahlung Production, Donald I. Mcree
Thick Target Bremsstrahlung Production, Donald I. Mcree
Dissertations, Theses, and Masters Projects
No abstract provided.
A Study Of Luminous-Shock Fronts In An Electromagnetic Shock Tube, James Franklin Roach
A Study Of Luminous-Shock Fronts In An Electromagnetic Shock Tube, James Franklin Roach
Dissertations, Theses, and Masters Projects
No abstract provided.
Some Physical Properties Of An Axial Electric Arc In A Radial Magnetic Field, Robert Norris Rigby
Some Physical Properties Of An Axial Electric Arc In A Radial Magnetic Field, Robert Norris Rigby
Dissertations, Theses, and Masters Projects
No abstract provided.
Vhf Oscillations In A Penning Gauge, Robert Newman Dennis
Vhf Oscillations In A Penning Gauge, Robert Newman Dennis
Dissertations, Theses, and Masters Projects
No abstract provided.