| Review of Electromagnetic Frequency (EMF) Safety Program for Homestead ARB, FL |
28 Nov 2012 |
20 pages |
| Authors:
Zahid Sulaiman; Samuel Ortiz; Michael Ames; SCHOOL OF AEROSPACE MEDICINE WRIGHT PATTERSON AFB OH OCCUPATIONAL AND ENVIRONMENTAL HEALTH DEPT
|
 | A review of the electromagnetic frequency (EMF) safety program at Homestead ARB was conducted. Additionally, a survey of two previously unassessed emitters was performed. USAFSAM personnel identified and corrected deficiencies in the existing base EMF safety program and provided training to BE personnel on the management of the program in accordance with Air Force Occupational Safety and Health Standard 48-9, Electro-magnetic Frequency (EMF) Radiation Occupational Health Program. |
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| Radial Photonic Crystals for Microwave Operation |
Sep 2012 |
4 pages |
| Authors:
A Diaz-Rubio; J Carbonell; D Torrent; F Cervera; M A Kirleis; A Pique; J Sanchez-Dehesa; NAVAL RESEARCH LAB WASHINGTON DC
|
| We analyze the properties of electromagnetic metamaterials with anisotropic constitutive parameters. Particularly, we analyze the so-called Radial Photonic Crystals, which are radially periodic structures verifying the Bloch theorem. This type of crystals can be designed and implemented in acoustics as well as in electromagnetism by using anisotropic metamaterials. They were originally proposed in acoustics, but similar functionalities are here proven in the electromagnetic domain together, for the first time, with ... |
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| Universal Zero Specular Reflection Curves for MetaMaterials |
Sep 2012 |
84 pages |
| Authors:
Choon B Ting; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Materials are generally classified in terms of their constitutive parameters, the complex permittivity and permeability epsilon in the frequency domain. These parameters are used to determine the response of materials to electromagnetic (EM) radiation. Materials found in nature have positive real parts for both epsilon and mu. In recent years, researchers have shown that a new class of materials called metamaterials (MTMs), characterized by inclusions of various shapes and materials ... |
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| Marine Corps Spectrum Management |
24 Jul 2012 |
13 pages |
| Authors:
Arthur DeLeon; HEADQUARTERS MARINE CORPS WASHINGTON DC COMMAND CONTROL COMMUNICATIONS AND COMPUTERS (C4) DIRECTORATE
|
| Spectrum Planning Section: Mission. Establish Marine Corps policy, provide oversight, guidance and procedures relating to the proper and efficient management of the electromagnetic spectrum. Provide Marine Corps representation (at the policy level) to various national, DoD, Joint, and DON organizations, working groups and forums. Provide administrative, technical and operational support to the Operating Forces (OPFOR) and Supporting Establishment (SE) in support of Marine Corps electromagnetic spectrum operational requirements. |
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| Scientific and Technological Achievements, 1946-2011, of the AFRL Electromagnetics Technology Division (AFRL/RYH) and Its Progenitors |
Jul 2012 |
61 pages |
| Authors:
Michael N Alexander; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH ELECTROMAGNETICS TECHNOLOGY DIVISION
|
| This report provides brief descriptions of the most significant R&D contributions/achievements and technology transfers/transitions by the AFRL Electromagnetics Technology Division (AFRL/RYH), from its formation (1946 -- under different names and under a different parent organization) until its relocation (2011) from Hanscom AFB to Wright Patterson AFB. A few references accompany each listed achievement. An appendix lists patents awarded to RYH scientists and engineers from approximately 1989-2011. |
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| Energy Harvesting and Storage Systems for Future AF Vehicles |
18 May 2012 |
133 pages |
| Authors:
Minoru Taya; Sam Jenekhe; Chunye Xu; Gouzong Cao; Yasuo Kuga; Paolo Feraboli; Martin Dunn; Kurt Maute; Ronggui Yang; SeeHee Lee; Sungtaek Ju; Thomas Hahn; Dan Inman; Ioannis Chasiotis; WASHINGTON UNIV SEATTLE CENTER FOR INTELLIGENT MATERIALS AND SYSTEMS
|
| This MURI project is aimed at designing a set of new energy-harvesting and storage materials (EHSM) and their integration of load-bearing airborne structures. The EHSM that were covered are, (i) organic solar cells based on two designs ,(a) dye-sensitized solar cells (DSSC) and (b) solid state semi-conductor polymer based solar cells(SSSPS), (ii) thermoelectric materials and modules, (iii) piezoelectrics and (iv) electromagnetic generator. This MURI team is composed of several universities, ... |
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| Electromagnetic Characterization of Inhomogeneous Media |
22 Mar 2012 |
78 pages |
| Authors:
Marcus A Sitterly; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Developed two permittivity profile extraction algorithms for inhomogeneous materials. These two algorithms were created using discrete and continuous approaches. The discrete method used a piece-wise constant permittivity assumption that allowed the use of homogeneous wave equations. Using laboratory data and a theoretical formulation, the permittivity of each piece-wise constant layer within the material was extracted using a root search algorithm. The continuous approach solved the problem using inhomogeneous wave equations. ... |
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| Exploitation of Unintentional Information Leakage from Integrated Circuits |
Dec 2011 |
220 pages |
| Authors:
William E Cobb; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Unintentional electromagnetic emissions are used to recognize or verify the identity of a unique integrated circuit (IC) based on fabrication process-induced variations in a manner analogous to biometric human identification. The effectiveness of the technique is demonstrated through an extensive empirical study, with results presented indicating correct device identification success rates of greater than 99:5%, and average verification equal error rates (EERs) of less than 0:05% for 40 near-identical devices. ... |
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| Advances in Developing Multiscale Flaw Models for Eddy-Current NDE (Preprint) |
Dec 2011 |
9 pages |
| Authors:
R K Murphy; Harold A Sabbagh; Elias H Sabbagh; John R Bowler; Yuan Ji; John C Aldrin; VICTOR TECHNOLOGIES LLC BLOOMINGTON IN
|
| The need to accurately model multiscale phenomena is ubiquitous in eddy-current nondestructive evaluation. By using volume-integral equations, we are able to develop a very simple algorithm for accurately computing the response of a very small anomaly in the presence of a much larger one. We validate the algorithm and its associated code in VIC-3D(copyright) through benchmark data on two test sets: (1) a notch at a bolt hole with an ... |
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| Eddy Current Benchmarking Experiments for Model Validation at AFRL |
Oct 2011 |
7 pages |
| Authors:
Jeremy S Knopp; Mark P Blodgett; Ryan D Mooers; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| To support an effort to estimate characteristics of surface-connected damage (i.e., cracks) in aerospace and propulsion structures, a computer-controlled scanning capability that acquires experimental eddy current data was developed based on an Agilent 4294A Impedance Analyzer. This instrument is being used to assess performance of different computational electromagnetic codes in terms of determining how well they predict the complex response from simulated flaws in conducting plates. The particular benchmark problem ... |
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| Dynamically-Tunable EBG Structure Demonstrator |
Sep 2011 |
9 pages |
| Authors:
Michael Heimlich; MACQUARIE UNIV SYDNEY (AUSTRALIA)
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| Electromagnetic Bandgap (EBG) structures exhibit large continuous regions as a function of frequency over which they will not allow a signal to propagate. A subclass of bandstop filters (BSF), EBG structures stop a signal from passing through by having signals not propagate in abeyance of Maxwell's Equations. Typically, EBG performance is achieved by modulating the geometric properties of an electromagnetic-guided or radiating structure so as to create a periodicity which ... |
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| Evaluation of LIDAR for Automating Recognition of Roads and Trails Beneath Forest Canopy |
Sep 2011 |
114 pages |
| Authors:
Steven L Muha; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis discusses the utility of evaluating Light Detection and Ranging (LiDAR) to automate the recognition of roads and trails beneath forest canopy on Digital Elevation Models (DEMs) for use in military and forestry applications. Data were analyzed from three separate locations, including low elevation mixed conifer Indian Creek Watershed in Trinity County, CA; High elevation mixed conifer Cold Creek Trailhead area in South Lake Tahoe, CA; and lowland mesic ... |
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| Some Studies of Slow-Wave Metamaterials and Their Tunability |
19 Aug 2011 |
10 pages |
| Authors:
Sailing He; ROYAL INST OF TECH STOCKHOLM (SWEDEN)
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| This research investigates the properties of slow-wave metamaterials and tunability. Case studies reported include the demonstration of electromagnetically induced transparency demonstration in a dielectric slab waveguide, a slow-light ultra-broadband absorber at RF frequencies, and tunable THz modulators in n-type semiconductors. |
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| Monostatic and Bistatic HF Radar Cross Section Analysis of Large Vessels Using FEKO |
APR 2011 |
40 pages |
| Authors:
Symon K. Podilchak; ROYAL MILITARY COLL OF CANADA KINGSTON (ONTARIO)
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| Monostatic and bistatic Radar Cross Sections (RCS) of Canadian Coast Guard Ship Teleost and cargo-container vessel named Bonn Express are simulated using FEKO commercial electromagnetic simulation software. A good agreement is achieved between the simulated values and the measured values supplied by DRDC Ottawa, at the radar frequency of 4.1 MHz. With confidence in these FEKO models, the effect of pitch, roll and freighter loading was then investigated to account ... |
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| A Zero-Sum Electromagnetic Evader-Interrogator Differential Game with Uncertainty |
21 Feb 2011 |
33 pages |
| Authors:
H T Banks; Shuhua Hu; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| We consider dynamic electromagnetic evasion-interrogation games in which the evader can use ferroelectric material coatings to attempt to avoid detection while the interrogator can manipulate the interrogating frequencies to enhance detection. The resulting problem is formulated as a two-player zero-sum dynamic differential game in which the cost functional is based on the expected value of the intensity of the reflected signal. We show that there exists a saddle point for ... |
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| Engineering Photonic Devices and Materials Through Quantum Confinement and Electromagnetic Design |
20 DEC 2010 |
39 pages |
| Authors:
Dennis Prather; DELAWARE UNIV NEWARK DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| In this effort, devices which used quantum confinement for light emission were designed. Two methods of quantum confinement were investigated; Si quantum dots (nanocrystals) and III-V pyramidal quantum dots. Investigation of Si nanocrystals included studies of the effects of varying silicon layer thickness and their agreement with quantum confinement theory. Along with photoluminescence, electroluminescence of silicon nanocrystals films was investigated under both DC and pulsed pumping. A power conversion efficiency ... |
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| A Two-Player Zero-Sum Electromagnetic Differential Game with Uncertainty |
18 Sep 2010 |
15 pages |
| Authors:
H T Banks; Shuhua Hu; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| We consider dynamic electromagnetic evasion-interrogation games where the evader can use ferroelectric material coatings to attempt to avoid detection while the interrogator can manipulate the interrogating frequencies to enhance detection. The resulting problem is formulated as a two-player zero-sum dynamic differential game in which the cost functional is based on the expected value of the intensity of the reflected signal. We show that there exists a saddle point for the ... |
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| Fundamental Questions About Superconductivity in the Pnictides (Former title: Electromagnetic and Nanostructural Studies of Rare Earth Copper Oxide Grain Boundaries Grain Boundaries in High Temperature Superconductors) |
30 Jun 2010 |
7 pages |
| Authors:
David C Larbalestier; Alex Gurevich; FLORIDA STATE UNIV TALLAHASSEE
|
| In early 2008 the Hosono group at Tokyo Institute of Technology discovered high temperature superconductivity in a new extensive family of pnictides based on doped As-Fe. This exciting discovery encouraged us to transition our work on grain boundary studies of YBCO to this new class of superconductors. We showed that they indeed exhibit high critical temperatures Tc, extremely high upper critical fields Hc2, an irreversibility field H* close to Hc2, ... |
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| Nonlinear Structuring and High-energy Electrons: Role in Ionosphere and in Thunderstorm Atmosphere Processes |
MAY 2010 |
65 pages |
| Authors:
Aleksander V. Gurevich; RUSSIAN ACADEMY OF SCIENCES MOSCOW LEBEDEV INST
|
| This report results from a contract tasking P. N. Lebedev Physical Institute as follows: The Project includes five Tasks: 1. The modification of the magnetosphere by the controllable flow of fast electrons coming upwards from the artificially modified ionosphere. Theoretical investigation and the conception of the experimental program. 2. The formation of super-narrow ionosphere structures in ionosphere artificially modified by powerful radio waves in double-resonance conditions. The super-narrow structures serve ... |
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| Demonstration and Validation of an Improved Airborne Electromagnetic System for UXO Detection and Mapping |
May 2010 |
60 pages |
| Authors:
ENVIRONMENTAL SECURITY TECHNOLOGY CERTIFICATION PROGRAM OFFICE (DOD) ARLINGTON VA
|
| In September 2008, Battelle completed construction of a new airborne, time-domain electromagnetic system for mapping and detecting unexploded ordnance (UXO). This system was developed with corporate funds on the basis of successful evaluation of a prototype system under Environmental Security Technology Certification Program (ESTCP) Project 200101. This system has been developed to address shortcomings of magnetometer-based systems where the presence of basalt flows or other iron-bearing soils and rocks impede ... |
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| Fundamental Physics and Practical Applications of Electromagnetic Flow Control in High Speed Flows |
05 APR 2010 |
17 pages |
| Authors:
Graham V. Candler; MINNESOTA UNIV MINNEAPOLIS
|
| There are two overall objectives of the proposed research program. The first objective is to perform fundamental studies of microwave and combined microwave/laser energy deposition. The studies include characterization of the new microwave coaxial resonator at the University of Illinois, and development of kinetic-gasdynamic models for microwave and combined microwave/laser energy deposition in air. The second objective is to investigate practical applications of microwave and combined microwave/laser energy deposition for ... |
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| Electromagnetic Field Control and Optimization Using Metamaterials |
Dec-2009 |
168 pages |
| Authors:
Jeffrey S McGuirk; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Transformation optics has shown the ability to cloak an object from incident electromagnetic radiation is possible. However, the material parameters are inhomogeneous, anisotropic, and, in some instances, singular at various locations. In order for a cloak to be practically realized, simplified parameter sets are required. However, the simplified parameters result in a degradation in the cloaking function. Constitutive parameters for simplified two-dimensional cylindrical cloaks have been developed with two material ... |
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| Phase-Locking and Frustration in an Array of Nonlinear Spin-Torque Nano-Oscillators (Preprint) |
23-Oct-2009 |
11 pages |
| Authors:
Elena Bankowski; Grant Gerhart; Andrei Slavin; Vasil Tiberkevich; OAKLAND UNIV ROCHESTER MI DEPT OF PHYSICS
|
| We demonstrate that high-frequency cooperative dynamics of an array of coupled nonlinear spin-torque nano-oscillators (STNO) can be controlled by introduction of an additional external phase shift BETAc between the microwave current, which couples STNOs, and the total array microwave voltage. When this external phase shift BETAc compensates the intrinsic phase shift BETA0, caused by the STNO nonlinearity, a phase-locking regime with increased output power and vanishing inhomogeneous linewidth broadening is ... |
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| Designing a Sensorless Torque Estimator for Direct Torque Control of an Induction Motor |
Sep-2009 |
87 pages |
| Authors:
Athanasios Tsoutsas; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| Nowadays, transportation is a major cause of air pollution. Electric propulsion could replace the internal combustion engines of automobiles and reduce the emission of exhaust gases. The propulsion of an electric vehicle requires the design of an accurate electromagnetic torque estimator and an efficient control system in order to control the speed of the vehicle. This concept is conveyed through this thesis. An electromagnetic torque calculator of an induction motor ... |
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| Hydromagnetic Waves and Instabilities in Kappa Distribution Plasma |
Jan-2009 |
12 pages |
| Authors:
B Basu; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| Stability properties of hydromagnetic waves (shear and compressional Alfven waves) in spatially homogeneous plasma are investigated when the equilibrium particle velocity distributions in both parallel and perpendicular directions (in reference to the ambient magnetic field) are modeled by kappa distributions. Analysis is presented for the limiting cases Xi alpha 1 and Xi alpha 1 for which solutions of the dispersion relations are analytically tractable. Here Xi alpha{a=e,i) is the ratio ... |
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| Data Modeling, Feature Extraction, and Classification of Magnetic and EMI Data, ESTCP Discrimination Study, Camp Sibert, AL. Demonstration Report |
Sep-2008 |
103 pages |
| Authors:
Stephen Billings; SKY RESEARCH ASHLAND OR
|
| An ESTCP-sponsored demonstration was conducted at the Former Camp Sibert, Alabama, where the objective was to discriminate potentially hazardous 4.2 mortars from non-hazardous shrapnel, range and cultural debris. Nine different discrimination techniques were tested and used data from the MTADS magnetometer array, a Geonics EM61 cart, the MTADS EM61 array and the Geonics EM63. Discrimination was achieved using either rule-based or statistical classification of feature vectors extracted from dipole or ... |
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| Working Together to Deliver the Best Solutions Quickly |
Sep-2008 |
27 pages |
| Authors:
Paul Lefebvre; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| The Naval Undersea Warfare Center Division Newport provides research, development, test and evaluation, engineering, analysis and assessment, and fleet support capabilities for submarines, autonomous underwater systems, and offensive and defensive undersea weapon systems, and stewards existing and emerging technologies in support of undersea warfare. Executes other responsibilities as assigned by the Commander, Naval Undersea Warfare Center. |
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| Motion of an Electric Dipole in a Static Electromagnetic Field |
SEP 2008 |
4 pages |
| Authors:
Carl E. Mungan; Andrew Lasinski; NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS
|
| Expressions for the force and torque on a moving electric dipole in a magnetostatic field are combined with those due to an electrostatic field. By sending oriented molecular dipoles into a region of crossed magnetic and electric fields, the molecules are selectively rotated based on the direction and magnitude of their velocities. In principle this field configuration could be used to create a molecular isolator that only lets molecules through ... |
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| Ranging With Electromagnetic Singularities |
APR 2008 |
16 pages |
| Authors:
Joseph N. Mait; Canh Ly; Markus Testorf; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Most improvements in radar have concentrated solely on the temporal characteristics of the electromagnetic pulse. The spatial dimension is typically exploited only through arrays of antennas. The limits to using spatial characteristics of a transmitted beam to perform ranging were investigated, specifically, Laguerre-Gaussian beams as potential carriers for encoding range in spatial characteristics. The results indicate that whereas the beams are indeed capable of encoding range, aberrations and imaging fidelity ... |
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| Microfluidic Power Generation |
28-Mar-2008 |
177 pages |
| Authors:
Aaron J Sprecher; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| This thesis includes the detailed mathematical calculations used to determine the feasibility of harnessing electrical energy from the blood flow through human capillaries. The designs are inspired by human physiology and well established electromagnetic energy harvesting techniques and the fabrication methods have been proposed for the various components of the device. The fabrication and the design of these components have also been extensively analyzed using calculations based on the governing ... |
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| High-Efficiency Helical Coil Electromagnetic Launcher and High Power Hall-Effect Switch |
29 FEB 2008 |
41 pages |
| Authors:
Thomas G. Engel; William C. Nunnally; John M. Gahl; MISSOURI UNIV-COLUMBIA COLL OF ENGINEERING
|
| Efficiency and scaling relationships for DC (i.e., non-induction) constant inductance gradient electromagnetic launchers are presented and discussed. Expressions for electromagnetic force, efficiency, back-voltage, and kinetic power are derived and given in terms of electrical circuit parameters. Launcher efficiency is shown to be a simple function of armature velocity and the launcher's characteristic velocity. The characteristic velocity characterizes the launcher and is the product of two new parameters; the mode constant ... |
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| Microwave and Millimeter Wave Magnetoelectric Interactions in Engineered Multiferroics and Dual Electric and Magnetic Field Tunable Devices |
16 JAN 2008 |
15 pages |
| Authors:
Gopalan Srinivasan; Andrei Slavin; Joseph Mantese; OAKLAND UNIV ROCHESTER MI DEPT OF PHYSICS
|
| Layered magnetostrictive-ferroelectric structures are multifunctional due to their response to mechanical and electromagnetic forces. Investigations on microwave magneto-electric (ME)interactions were performed on ferrite-ferroelectrics layered structures. Systems studied include yttrium iron garnet (YIG)-lead zirconate titanate (PZT) or YIG-barium strontium titanate (BST). Our efforts have resulted in the following breakthroughs in experimental and theoretical understanding: (i) The observation of strong microwave ME interactions in YIG-PZT; (ii) Theory and experiments on the creation ... |
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| Ocean Wave Energy Harvesting Devices |
JAN 2008 |
|
| Authors:
Jeffrey T. Cheung; Earl F. Childress III; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
|
 | Development of a mechanically sound buoy design. which generated 10W average power in Beaufort Sea State I. and showed potential for up to 20W in Sea State 4. Development of a wave energy harvesting buoy capable of generating 2W in Sea State I. and with proper mechanical alignment able to generate over 4W. Development of two modeling capabilities: a classical mechanical model used lbr optimizing the electromagnetic design,. and a ... |
|
| FY06 NRL DoD High Performance Computing Modernization Program Annual Reports |
31 OCT 2007 |
124 pages |
| Authors:
Portia A. Shingler; Beth A. Howell; NAVAL RESEARCH LAB WASHINGTON DC CENTER FOR COMPUTATIONAL SCIENCE
|
| This book is a compilation of reports on all the work accomplished by NRL scientists and engineers and their collaborators using the DoD High Performance Computing Modernization Program's (HPCMP) resources for fiscal year 2006. The reports encompass work performed by researchers at all three NRL sites: Washington, DC; Stennis Space Center, Mississippi; and Monterey, California. These reports are categorized according to the primary Computational Technology Area (CTA) as specified by ... |
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| Free Space Measured Loss Comparison of Single and Double Ring Resonators for Negative Index Media |
14 SEP 2007 |
6 pages |
| Authors:
John S. Derov; Beverly W. Turchinetz; James W. Dean; Everett E. Crisman; Alvin J. Drehman; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| Since the first demonstration of negative refractive index using nested or edge coupled split ring resonators and posts, various proposals have been made for improvement of the structures. Loss is an ongoing concern for these media at microwave frequencies and above. One alternate design uses broadside coupled split rings printed front to back on a substrate. This approach, which avoids bianisotropic effects of edge coupled rings, has been demonstrated successfully ... |
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| Improvement of Electromagnetic Code for Phased Array Antenna Design |
01-Jun-2007 |
14 pages |
| Authors:
Henrik Holter; ROYAL INST OF TECH STOCKHOLM (SWEDEN)
|
| This is a final report for EOARD grant FA8655-07-1-3059 entitled Improvement of electromagnetic code for phased array antenna design . An existing time domain code for electromagnetic design and analysis of phased array antennas and other periodic structures such as frequency selective surfaces and meta-materials has been improved in several ways. The code which is named PBFDTD (Periodic Boundary FDTD) now handles magnetic materials (lossy and loss-free). Frequency domain surface ... |
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| Report on the Wisconsin-Stanford-Kansas-Davis-Florida State MURI on Scientific Challenges of Coated Conductors |
30 MAR 2007 |
6 pages |
| Authors:
David C. Larbalestier; WISCONSIN UNIV-MADISON APPLIED SUPERCONDUCTIVITY CENTER
|
| Coordinated, multi-institutional research (University of Wisconsin, Stanford University, the University of Kansas, the University of California-Davis, and Florida State University) is addressing key underlying scientific and engineering issues of Generation II Coated Conductors, and is fabricating and acquiring through collaborations forefront CC samples, developing new tools for their understanding and characterizing them so as to resolve key performance issues. Areas of concentration include substrates, buffer layers, the superconducting overlayer, their ... |
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| Modeling Pitting and Corrosion Phenomena By Eddy-Current Volume-Integral Equations (Postprint) |
MAR 2007 |
10 pages |
| Authors:
Harold A. Sabbagh; Elias H. Sabbagh; R. K. Murphy; John C. Aldrin; Eric Lindgren; Jeremy S. Knopp; VICTOR TECHNOLOGIES LLC BLOOMINGTON IN
|
| A wide variety of problem in computational electromagnetics has been successfully solved using a volume-integral approach along with conjugate-gradient methods. In the arena of quantitative nondestructive evaluation (NDE) of nuclear-power and aerospace structures, the problem of modeling pitting and corrosion phenomena is particularly challenging. Based on real corrosion pits in heat-exchanger tubes in nuclear power plants, and manufactured pits in aircraft structures, we develop general models that are suitable for ... |
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| Fundamental Physics and Practical Applications of Electromagnetic Local Flow Control in High Speed Flows |
16 FEB 2007 |
15 pages |
| Authors:
Doyle Knight; Hong Yan; Greg Elliott; Nick Glumac; Graham Candler; Alexander Zheltovodov; RUTGERS - THE STATE UNIV PISCATAWAY NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| Achievement of the future US Air Force mission requires development of new high speed air vehicles. The aerodynamic performance of high speed air vehicles is sensitive to local flow phenomena which may adversely affect vehicle operation and possibly result in vehicle loss. An example is the Edney W shock-shock interaction which causes intense local surface heat transfer. New concepts in local flow control for high speed flows are needed to ... |
|
| Basics of SAR Polarimetry I |
01 FEB 2007 |
41 pages |
| Authors:
Wolfgang-Martin Boerner; UIC-ECE COMMUNICATIONS CHICAGO IL COMMUNICATIONS, SENSING AND NAVIGATION LAB
|
| A comprehensive overview of the basic principles of radar polarimetry is presented. The relevant fundamental field equations are first provided. The importance of the propagation and scattering behavior in various frequency bands, the electrodynamic foundations such as Maxwell's equations, the Helmholtz vector wave equation and especially the fundamental laws of polarization will first be introduced. The fundamental terms which represent the polarization state will be introduced, defined and explained. Main ... |
|
| Advanced Propagation Model (APM) Version 2.1.04 Computer Software Configuration Item (CSCI) Documents |
FEB 2007 |
439 pages |
| Authors:
A. E. Barrios; W. L. Patterson; R. A. Sprague; SPACE AND NAVAL WARFARE SYSTEMS COMMAND SAN DIEGO CA
|
| This document provides Version 2.1.04 Computer Software Configuration Item documents for the Advanced Propagation Model (APM). The APM calculates range-dependent electromagnetic system propagation loss and propagation factor within a heterogeneous atmospheric medium over variable terrain, where the radio-frequency index of refraction is allowed to vary vertically and horizontally. The first document specifies the functional requirements that are to be met by the APM CSCI. A discussion of the input software ... |
|
| Feature-based Detection and Discrimination at DuPont's Lake Success Business Park, Connecticut |
JAN 2007 |
57 pages |
| Authors:
Dean A. Keiswetter; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) CARY NC ADVANCED SENSORS AND ANALYSIS DIVISION
|
| The objective of this demonstration was to determine if laser-positioned, high-density EM61 data acquired in a moving survey mode could support feature-based discrimination decisions for a canopied site in Bridgeport Connecticut. Inversion results were benchmarked using cued data acquired in a controlled, gridded approach over 40 targets. The site was seeded with inert UXO, ranging in size from 37mm to 105mm projectiles. We inverted the measured EM61 field data assuming ... |
|
| Radiation Boundary Conditions for Maxwell's Equations: A Review of Accurate Time-Domain Formulations |
2007 |
34 pages |
| Authors:
Thomas Hagstrom; Stephen Lau; BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
|
| We review time-domain formulations of radiation boundary conditions for Maxwell's equations, focusing on methods which can deliver arbitrary accuracy at acceptable computational cost. Examples include fast evaluations of nonlocal conditions on symmetric and general boundaries, methods based on identifying and evaluating equivalent sources, and local approximations such as the perfectly matched layer and sequences of local boundary conditions. Complexity estimates are derived to assess work and storage requirements as a ... |
|
| Improved Element-Free Galerkin Method for Electromagnetic NDE Model (Preprint) |
DEC 2006 |
9 pages |
| Authors:
Xin Liu; Yiming Deng; Zhiwei Zeng; Lalita Udpa; Jeremy S. Knopp; MICHIGAN STATE UNIV EAST LANSING DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This paper presents improvements made to enhance the Element-Free Galerkin method (EFG) for NDE applications. By using orthogonal basis functions instead of the conventional polynomial basis, the inversion of the ill-conditioned shape function matrix is eliminated. Therefore, the accuracy of the results is improved. Preliminary one-dimensional (1-D) and two-dimensional (2-D) examples are presented to demonstrate the improvement in accuracy and efficiency offered by orthogonal basis functions. |
|
| Traveling Waves on Two- and Three-Dimensional Periodic Arrays of Lossless Acoustic Monopoles, Electric Dipoles, and Magnetodielectric Spheres |
08 NOV 2006 |
215 pages |
| Authors:
Robert A. Shore; Arthur D. Yaghjian; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE/ELECTROMAGNETICS TECHNOLOGY DIV
|
| Traveling waves on 2D and 3D infinite periodic arrays of small lossless acoustic monopoles, electric dipoles, and magnetodielectric spheres are investigated. The waves are assumed to propagate along the axis of the arrays. The focus is on obtaining the kd-BETAd equations (diagrams) characterizing the traveling waves. Initial forms of the kd-BETAd equations are obtained by summing the fields scattered from all the array elements incident on a reference element of ... |
|
| Comparison of Electromagnetic Simulation Results with Experimental Data for an Aperture-Coupled C-Band Patch Antenna |
NOV 2006 |
24 pages |
| Authors:
Steven Keller; William Coburn; Theodore Anthony; Chad Patterson; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| The Method of Moments, implemented in 2.5-dimensions (2.5-D) with the multilayer Green's Function, and the Finite Element Method, a fully three-dimensional (3-D) solution of Maxwell's equations, are two popular methods for antenna simulations. Commercial software implementing these two methods was used to simulate a single aperture-coupled patch antenna element. This effort was time limited so that a simple antenna was selected for which the antenna design, fabrication, and measurements could ... |
|
| Innovative Multifunctional Concepts Enabled by Novel Fabrication Strategies |
01 OCT 2006 |
15 pages |
| Authors:
Sanjay Sampath; R. Gambino; C. Gouldstone; H. WU; J. BROGAN; STATE UNIV OF NEW YORK AT STONY BROOK
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| Often design, materials and fabrication development are pursued as successive steps in a technology implementation cycle. This stymies a concurrent thinking approach that would allow an integrated strategy where various stages of the technology development life cycle are concurrently considered. This is particularly true for multifunctional systems where new architectures must be considered within the constraints of design, materials and manufacturing. We propose a new strategy in multi-functionality by incorporating ... |
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| High Gain Printed Phased Array for SAR Applications Using Planar Electromagnetic Band-Gap Technology |
01 OCT 2006 |
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| Authors:
N. Llombart; A. Neto; G. Gerini; TNO Defence Security and Safety The Hague (Netherlands)
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| This paper shows how the design of integrated arrays can significantly benefit from Planar Circularly Symmetric (PCS) Electromagnetic Band Gap (EBG) structures. Using this technology, a phased array that scans up to 40 degrees in one dimension and that is characterized by relatively large bandwidth (BW~15%) is designed, manufactured and tested. The specific advantages coming from the use of PCS-EBGs are two fold. On one hand the losses associated to ... |
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| Buried Object Classification using a Sediment Volume Imaging SAS and Electromagnetic Gradiometer |
Sep-2006 |
7 pages |
| Authors:
Daniel D Sternlicht; J K Harbaugh; Anjana K Shah; Michael L Webb; Richard Holtzapple; APPLIED SIGNAL TECHNOLOGY INC TORRANCE CA
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| To advance naval capabilities in identifying buried mines and unexploded ordnance, hybrid systems that fuse data from disparate sensors are being developed. This paper describes preliminary results of a classification engine that combines target features and classification parameters from a synthetic aperture Buried Object Scanning Sonar (BOSS) and an electromagnetic Real-time Tracking Gradiometer (RTG). The target characteristics that generate signals of interest for these sensors (acoustic backscatter and induced changes ... |
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| High-Efficiency Helical Coil Electromagnetic Launcher |
31 AUG 2006 |
37 pages |
| Authors:
Thomas G. Engel; William C. Nunnally; John M. Gahl; MISSOURI UNIV-COLUMBIA DEPT OF ELECTRICAL ENGINEERING
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| Technical progress during the reporting period includes the development of new theory for electromagnetic launcher efficiency which is applicable to all constant inductance gradient launcher geometries. This theory also develops methods to predict the performance of different geometry electromagnetic launchers and compare them to each other. A theoretical analysis is also presented to design a helical electromagnetic launcher for a specific volt- amp characteristic. Experimentally measured performance is reported for ... |
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Reports by Keyword(s)
ELECTROMAGNETISM
