| Analysis of EAW and ReComm Communication Schemes for Hypersonic Flight: Status Report 1 |
01-Dec-2009 |
20 pages |
| Authors:
D V Rose; C Thoma; V Sotnikov; VOSS SCIENTIFIC LLC ALBUQUERQUE NM
|
 | We summarize progress in our analysis of proposed communication schemes for hypersonic vehicles in flight. Investigations into the electron-acoustic wave (EAW) communication scheme have yielded a dispersion analysis indicating that EAW modes can be generated and propagate in the plasma layer [D. V. Rose et al., Voss Sci. Rep. No. VSL-0737, Nov. 2007]. These modes can be coupled to electromagnetic waves at the plasma layer boundary for the assumption of ... |
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| Low Power Circuit for EM Warning System Sensor |
Sep-2009 |
26 pages |
| Authors:
Marc Litz; John Russo; James Brent; ARMY RESEARCH LAB ADELPHI MD
|
| Low power sensors are important to the Army for purposes of monitoring infrastructure over the life-cycle of operation. Isotope batteries can power and operate compact, low power sensors for decades. A low power circuit has been developed to generate a repetitive radio frequency (RF) impulse, which will be used to indicate that a sensor has detected a target. This sensor circuit has been modeled and built to evaluate several isotope ... |
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| Simulated E-Bomb Effects on Electronically Equipped Targets |
Sep-2009 |
126 pages |
| Authors:
Enes Yurtoglu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATION SCIENCES
|
| Like High Altitude Electromagnetic Pulse (HEMP), high power microwaves (HPM) produce intense energies, which may overload or damage various electrical system components such as microcircuits. This thesis investigates possible effects of a hypothetically designed HEMP-like weapon, an e-bomb, on electronically equipped target systems. The procedure to determine these possible effects is to estimate the electromagnetic coupling from first principles and simulations using a coupling model program (CEMPAT), pursuing a feasible ... |
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| High-Velocity Impact of Low-Density Projectiles on Structural Aluminum Armor |
Sep-2009 |
14 pages |
| Authors:
B R Sorensen; K D Kimsey; B M Love; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The US Army Research Laboratory has been studying the impact physics of low-density projectiles on urban and light-armor structures for use in electro-magnetic cannons. In this report, results of low-aspect ratio projectiles of nylon, aluminum and steel impacting aluminum armor at velocities above 2000 m/s will be presented. Both computational solid mechanics and analytic modeling techniques were used to supplement experiments to derive a toolkit for assessing target response and ... |
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| Numerical Optimization of an Annular Field Reserved Configuration Translation Experiment |
14-Aug-2009 |
16 pages |
| Authors:
Lyon B King; Carrie S Niemela; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Annular field reversed configuration (AFRC) devices form annular plasma toroids between a pair of concentric cylindrical coils. This plasmoid remains detached from the external magnetic _field so that it can be ejected from the coils, making AFRCs viable pulsed inductive plasma accelerators. Though numerous formation studies on AFRCs are available, no successful translation studies have been published. Michigan Technological University, in conjunction with the Air Force Research Laboratory, is investigating ... |
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| Electromagnetic (EM) Wave Attachment to Laser Plasma Filaments |
May-2009 |
50 pages |
| Authors:
D C Friedman; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ WEAPONS AND SOFTWARE ENGINEERING CENTER
|
| This report explores the theoretical and experimental analysis of using plasma filaments generated by a femtosecond class laser system as a means for transmission of radio frequency (RF) electromagnetic (EM) waves. Theoretically, the plasma filaments are modeled as complex cylindrical wires in space for single and dual wire configurations. Attenuation as a function of distance is calculated for single wire transverse electric mode propagation and dual wire transverse electromagnetic (TEM) ... |
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| Navy Ford (CVN-78) Class Aircraft Carrier Program: Background and Issues for Congress |
17-Apr-2009 |
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| Authors:
Ronald O'Rourke; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
 | CVN-78 and CVN-79 are the first two ships in the Navy's new Gerald R. Ford (CVN-78) class of nuclear-powered aircraft carriers. CVN-78: CVN-78 was procured in FY2008, and is scheduled to enter service in 2015. The ship?s procurement cost was estimated in the FY2009 budget at about $10.5 billion in then-year dollars. Although CVN-78 was procured in FY2008, it is being funded with four-year incremental funding across FY2008-FY2011, and the ... |
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| A MEMS Multi-Cantilever Variable Capacitor On Metamaterial |
26-Mar-2009 |
130 pages |
| Authors:
Luke Rederus; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Negative refractive index materials are an example of metamaterials that are becoming increasingly popular. Research into these metamaterials could possibly be the first steps toward bending electromagnetic radiation(i.e., microwaves, light, etc.) around an object or person. Split ring resonators (SRR) are classified as metamaterials that create an artificial magnetic response from materials with no inherent magnetic properties. Once fabricated, an SRR has a specific resonant frequency due to its permanent ... |
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| RF Polymers II |
17-Mar-2009 |
17 pages |
| Authors:
Leo Kempel; Shanker Balasubramaniam; MICHIGAN STATE UNIV EAST LANSING
|
| Design of polymer composites with specific engineered electromagnetic properties are of use in a variety of physical electromagnetic systems above 100 MHz. In physical electromagnetic systems, e.g., GPS, radomes, WiFi, etc., proper choice of the material can be transformative in that it can yield considerably better performance. Of interest to us is the possible development of low loss magneto-dielectric composites. This project investigates various aspects of material systems, starting with ... |
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| Viewing Radiation Signatures of Solar Energetic Particles in Interplanetary Space |
Jan-2009 |
8 pages |
| Authors:
S W Kahler; B R Ragot; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
|
| A current serious limitation on the studies of solar energetic particle (SEP) events is that their properties in the inner heliosphere are studied only through in situ spacecraft observations. Our understanding of spatial distributions and temporal variations of SEP events has come through statistical studies of many such events over several solar cycles. In contrast, flare SEPs in the solar corona can be imaged through their radiative and collisional interactions ... |
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| Demonstration of an Enhanced Vertical Magnetic Gradient System for UXO |
Dec-2008 |
52 pages |
| Authors:
William E Doll; BATTELLE MEMORIAL INST OAK RIDGE TN
|
| It is estimated that unexploded ordnance (UXO) may contaminate 15 million acres or more within the United States alone. A need for improved technologies for mapping and detecting UXO has led to development of a sequence of airborne reconnaissance systems using electromagnetic and magnetic sensors. In 2002, Battelle staff (then at Oak Ridge National Laboratory [ORNL]) evaluated a prototype airborne vertical magnetic gradient system for mapping and detecting UXO. Airborne ... |
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| Soil Microbial Activity Benchmarks (Provisional) for Ecological Risk Assessments at Explosives-Contaminated Sites: Promoting Range Sustainability |
Dec-2008 |
8 pages |
| Authors:
R G Kuperman; R T Checkai; C T Phillips; M Simini; S Dodard; J Hawari; S Rocheleau; M Joly; G I Sunahara; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| The Army Strategy for the Environment applies an ecosystem approach to managing natural resources on Army installations. It incorporates the principles of sustainability across the Army into all functional areas. We conducted investigations to develop critical data required for successful management of Army installations in a sustainable manner and for the knowledge-based decision making. Assessment and protection of the terrestrial environment at Army testing and training ranges is being advanced ... |
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| Sensing Challenges for Controls and PHM in the Hostile Operating Conditions of Modern Turbine Engine (Postprint) |
01-Jul-2008 |
14 pages |
| Authors:
Alireza Behbahani; Kenneth Semega; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| Advanced gas turbine engines have evolved over the last several decades to dominate aviation's propulsion, commercial and the military market. Continuing engine performance and reliability advances will require sensor components that operate reliably under extreme engine operating conditions (e.g., takeoff, max thrust) and in harsh environments (e.g., high temperature and radiation). The design of advanced controls and Propulsion Health Management (PHM) will also depend on the use of components with ... |
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| Automated Classification of Power Signals |
01-Jun-2008 |
|
| Authors:
Ethan R Proper; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| The Non-Intrusive Load Monitor (NILM) is a device that utilizes voltage and current measurements to monitor an entire system from a single reference point. The NILM and associated software convert the V/I signal to spectral power envelopes that can be searched to determine when a transient occurs. The identification of this signal can then be determined by an expert classifier and a series of these classifications can be used to ... |
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| Configuration of Wireless Cooperative/Sensor Networks |
25-May-2008 |
34 pages |
| Authors:
Hamid R Shafiee; B Maham; J Vazifehdan; AMERICAN UNIV IN DUBAI (UNITED ARAB EMIRATES)
|
| This report results from a contract tasking American University in Dubai as follows: The use of spatial diversity is an effective way to counter the adverse effects of fading in wireless channels. When employing more than one antenna at each node of a wireless network is not applicable, cooperation diversity protocols exploit the inherent spatial diversity of relay channels by allowing mobile terminals to cooperate and form virtual antenna arrays. ... |
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| Computational Electromagnetics |
25 FEB 2008 |
10 pages |
| Authors:
Oscar P. Bruno; MICHELSON SCIENCE CENTRE/CALTECH PASADENA CA
|
| The Objectives are as follows: 1) High-frequency integral equations: Multiple-scattering/ shadowing interactions; 2) Periodic and random surfaces and structures; 3) Canonical Integration: Edge scattering; 4) Canonical Integration: High Frequency; 5) Geometry representation and solution of challenging real-world problems. |
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| Advanced Narrowband Electromagnetic Size and Shape Determination |
15 FEB 2008 |
|
| Authors:
S. Kusiak; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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| This report discusses a fundamental radar imaging problem for narrowband electromagnetic waves that extends the recent results originally obtained in [1, 2] in the scalar, or acoustic, setting. In particular we demonstrate the ability to efficiently image three-dimensional convex conducting bodies by using the knowledge of the scattered electric field for one fixed monochromatic illumination of the target. In this problem our knowledge of the scattered electric wave is understood ... |
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| Modeling Exposure to Electromagnetic Fields with Realistic Anatomical Models: The Brooks Finite Difference Time Domain (FDTD) |
01-Feb-2008 |
32 pages |
| Authors:
John Ziriax; Samuel Adams; Jason Payne; Lauri Harris; NAVAL HEALTH RESEARCH CENTER SAN DIEGO CA
|
| Air Force Research Laboratory/Human Effectiveness Directorate Radio Frequency Radiation Branch (AFRL/RHDR) and Naval Health Research Center (NHRC) have long used Finite Difference Time Domain (FDTD) software to study radiofrequency radiation (RF) bioeffects. FDTD is a direct time-domain solver for Maxwell's equations. The original Brooks FDTD code was developed as part of the Brooks Dosimetry Project and has been repeatedly enhanced to meet empirical and theoretical research needs. Many feature upgrades ... |
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| Laser Induced Shock Waves and Vaporization in Biological System and Material Science |
30 JAN 2008 |
6 pages |
| Authors:
Bernard S. Gerstman; FLORIDA INTERNATIONAL UNIV MIAMI DEPT OF PHYSICS
|
| Theoretical and computational work was carried out to investigate the underlying physical mechanisms that cause laser induced biological damage and material stress. In order to cause damage to the absorbing material, the electromagnetic energy of the laser pulse must be converted to thermo-mechanical energy. We have developed a computational model that allows the calculation of damage resulting from a laser pulse of any duration or energy due to temperature rise, ... |
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| Electromagnetic Models and Inversion Techniques for Multiple UXO Discrimination |
31-Dec-2007 |
23 pages |
| Authors:
Beijia Zhang; Jin A Kong; Bae-Ian Wu; Hongsheng Chen; MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
|
| Recovery of buried unexploded ordnance (UXO) is very slow and expensive due to the high false alarm rate created by clutter. Electromagnetic induction (EMI) has been shown to be a promising technique for UXO detection and discrimination. We use the EMI response of buried targets to identify or classify them. Given that now a more complete model of the measurable response of a buried UXO is implemented, this study proceeds ... |
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| Physical Foundations of Plasma Microwave Sources Based on Anomalous Doppler Effect |
17-Sep-2007 |
19 pages |
| Authors:
Eduard V Rostomyan; NATIONAL ACADEMY OF SCIENCE ASHTARACK (ARMENIA) INST OF RADIOPHYSICS AND ELECTRONICS
|
| This project is concerned microwave relativistic plasma electronics, dealing with problems of converting the energy of intense electron beams into high power coherent electromagnetic radiation. This is one of the main topics of AFOSR's interests on basic research in physics and electronics. Plasma filling of microwave devices allows operating at higher beam currents and gradually changing frequency of output radiation. In addition plasma mitigates voltage depression and improves characteristics of ... |
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| Determining Surface Combatant Characteristics Requirements Through A Mission Effectiveness Analysis Framework |
SEP 2007 |
75 pages |
| Authors:
Jeffrey A. Koleser; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Ship performance characteristics, such as max-sustained speed, acceleration, and maneuverability are generally pre-determined as a platform requirement based on precedents. However, these pre-determined performance characteristics have far reaching impacts on the size, logistics, manning, and cost of the ship platform. Instead of designing to pre-defined platform performance requirements, ship performance characteristics should be determined based on fulfilling mission objectives. This research evaluates the viability to effectively determine if the ship ... |
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| High-Frequency Muzzle Voltage Measurements |
AUG 2007 |
9 pages |
| Authors:
S. Levinson; F. Stefani; TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
|
| The muzzle voltage in solid-armature railguns is an important diagnostic because it can provide information about the state of the rail-armature interface. Sudden jumps in the muzzle voltage can indicate that an armature has made a transition from low voltage to arcing contact. However, in many tests, the muzzle voltage increases gradually, and the onset of transition as indicated by the muzzle voltage is ambiguous. This report describes research aimed ... |
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| Evaluation of Airborne Remote Sensing Techniques for Predicting the Distribution of Energetic Compounds on Impact Areas |
AUG 2007 |
202 pages |
| Authors:
Mark R. Graves; Linda P. Dove; Thomas F. Jenkins; Susan Bigl; Marianne E. Walsh; Alan D. Hewitt; Dennis Lambert; Nancy Perron; Charles Ramsey; Jeff Gamey; Les Beard; William E. Doll; Dale Magoun; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
|
| The characterization of impact area munitions constituents has typically employed traditional soil sampling approaches. These sampling approaches do not accurately account for the distribution of such contaminants over the landscape due to the distributed nature of explosive compound sources throughout impact areas, the highly localized distribution of contaminants surrounding these sources, and inaccurate records of historical target locations. Remote sensing and geographic information system (GIS) technologies were utilized to assist ... |
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| Defense Acquisitions: Navy Faces Challenges Constructing the Aircraft Carrier Gerald R. Ford within Budget |
AUG 2007 |
58 pages |
| Authors:
Paul L. Fracnis; Karen Zuckerstein; Lisa L. Beradi; Diana Moldafsky; Moshe Scwhzart; Alyssa Weir; GOVERNMENT ACCOUNTABILITY OFFICE WASHINGTON DC
|
| As a result of a substantial investment of time and money, the Navy has reduced the risks associated with a number of essential technologies, including the nuclear propulsion and electric plant. At this time, several technical risks that could lead to increased construction costs and potentially result in capability reductions still remain. In particular, the electromagnetic aircraft launch system (EMALS), the advanced arresting gear, and the dual band radar face ... |
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| Refractive Index and Wavenumber Properties for Cyclotron Resonant Quasilinear Diffusion by Cold Plasma Waves |
05 JUL 2007 |
9 pages |
| Authors:
J. M. Albert; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| Wave-particle interactions have a large effect on magnetospheric particles, in the radiation belts and elsewhere. Bounce-averaged quasilinear diffusion coefficients have been calculated for whistler hiss and chorus and electromagnetic ion cyclotron waves (EMIC), which are all believed to play major roles. To perform these calculations efficiently, techniques have been developed that use properties of the refractive index of these modes to identify ranges of wave-normal angle that are compatible with ... |
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| Optical Radiation Transmittance of Aircraft Windscreens and Pilot Vision |
JUL 2007 |
20 pages |
| Authors:
Van B. Nakagawara; Ron W. Montgomery; Wesley J. Marshall; FEDERAL AVIATION ADMINISTRATION OKLAHOMA CITY OK CIVIL AEROSPACE MEDICAL INST
|
| Optical radiation can have acute and chronic effects on the tissues of the eye, especially if exposure levels exceed normal repair capabilities. In support of a Department of Homeland Security project, the transmittance properties of aircraft windscreens were measured at the FAA's Civil Aerospace Medical Institute (CAMI) for both visible and invisible optical radiation. This paper focuses on windscreen transmittance in the ultraviolet (UV) (< 380 nm) and visible (380-780 ... |
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| A Time Domain Integral Equation Approach to Electromagnetic Interference Simulation |
29 JUN 2007 |
8 pages |
| Authors:
Daniel S. Weile; DELAWARE UNIV NEWARK
|
| The goal of this project, which tasted from June 1, 2004 to May 31, 2007 was to develop new analysis methods for the modeling of broadband electromagnetic radiation in the time-domain useful for solving electromagnetic interference (EMI) problems. The work was based on a new approach for solving time-domain integral cquations (TDIEs) with stability and accuracy, but was soon extended to some other approaches. The results produced by the research ... |
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| Assessment of TEM Cells for Whole Aircraft EMV Testing |
MAY 2007 |
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| Authors:
Andrew J. Walters; Chris Leat; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) AIR OPERATIONS DIV
|
| Transverse Electromagnetic (TEM) cells offer one solution to the problem of electromagnetic vulnerability (EMV) testing of whole vehicles at lower frequencies. Combined with a reverberation chamber (RC) TEM cells offer an attractive solution to a EMV testing facility which could operate in the frequency range of 10 kHz to 18 GHz. In order to move toward a hybrid RC/TEM facility the non-uniform transition region between TEM and RC operation (i.e. ... |
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| Plasma Interactions with Spacecraft |
16 MAR 2007 |
79 pages |
| Authors:
V.A. Davis; M. J. Mandell; S. L. Huston; R. A. Kuharski; B. M. Gardner; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
|
| The objective of this contract is to develop, incorporate, test, and validate new algorithms for Nascap-2k that are needed to self-consistently compute plasma transport and to model electromagnetic radiation in the near-to mid-field from VLF (3 kHz to 30 kHz) antennas. The plasma flow models can be used to address various plasma engineering concerns including surface discharges due to meteoroid impact and spacecraft contamination due to electric propulsion plasma plume ... |
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| Science and Technology of Chemicals and Biological Sensing at Terahertz Frequencies |
28 FEB 2007 |
41 pages |
| Authors:
II Weikle Robert M.; Tatiana Globus; Elliott Brown; Jack East; VIRGINIA UNIV CHARLOTTESVILE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This research program is aimed to discover and understand the fundamental physical principles governing the interaction of biological molecules with electromagnetic radiation in the terahertz region of the spectrum. In addition, a critical focus is to develop the technology needed to study these interactions and to apply this technology to the design and realization of instrumentation for detecting and identifying biological molecules and their agents. Achieving these objectives is a ... |
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| Basics of SAR Polarimetry II |
01 FEB 2007 |
31 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 ... |
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| Optimisation of Dallenbach Layers Using Real Materials |
JAN 2007 |
|
| Authors:
P. Saville; DEFENCE RESEARCH AND DEVELOPMENT ATLANTIC DARTMOUTH (CANADA)
|
| In this paper multilayer Dallenbach absorbers were designed using the genetic algorithm optimisation routine and known material properties. The genetic algorithm was used to provide the global minimum solution to the reflectivity performance of the absorbers. The bandwidth and reflectivity of the absorber designs depend on the number of layers, layer composition and the layer order. Successful absorber designs are those that present an impedance gradient to the electromagnetic radiation. ... |
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| Evaluation of Airborne Electromagnetic Systems for Detection and Characterization of Unexploded Ordnance (UXO): Cost & Performance Report |
JAN 2007 |
67 pages |
| Authors:
William Doll; BATTELLE MEMORIAL INST OAK RIDGE TN
|
| As a result of past military training and weapons-testing activities, an estimated 6 million hectares (approximately 15 million acres) of U.S. land is potentially contaminated with unexploded ordnance (UXO) and/or weapons testing-and training-related artifacts. These contaminated areas include sites designated for base realignment and closure (BRAC) and formerly used defense sites (FUDS) Using current technologies, the costs associated with detection, identification, and mapping of this contamination has been estimated to ... |
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| Sensor Orientation Effects on UXO Geophysical Target Discrimination |
DEC 2006 |
105 pages |
| Authors:
Jack Foley; SKY RESEARCH ASHLAND OR
|
| Use of electromagnetic (EM) methods to discriminate frag and geology from unexploded ordnance (UXO) has shown steady improvement over time as demonstrated by test site results. Performance of off- the-shelf and customized EM sensors have increased both in terms of UXO probability of detection and false alarm rate. Parallel with the increase in capabilities of UXO detection and discrimination is the Increasing use of digital geophysical techniques on live sites. ... |
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| Seeking Radio Emissions from Hypervelocity Micrometeoroid Impacts: Early Experimental Results from the Ground |
15 NOV 2006 |
8 pages |
| Authors:
M. J. Starks; D. L. Cooke; B. K. Dichter; L. C. Chhabildas; W. D. Reinhart; III Thornhill T. F.; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| High-velocity impact experiments have been conducted to look for radio frequency (RF) emissions from impact-produced plasmas that could be used to identify micrometeoroid impacts to spacecraft in orbit. Launched by a three-stage light gas gun, 17 mm diameter by 0.9 mm thick Ti6Al-4V flyer plates impacted 0.75 mm thick indium (In) foil at more than 10 km s(-1). The resulting collision presumably ionized some fraction of the vaporized in cloud, ... |
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| Classical Model of the Electromagnetic Interaction Suitable for High Speed Semiconductor Device Simulation |
NOV 2006 |
9 pages |
| Authors:
Matt Grupen; HIGH PERFORMANCE TECHNOLOGIES INC ABERDEEN MD
|
| The vector field relations and mobile charge thermodynamics that form a complete and self-consistent classical model of the electromagnetic interaction are presented. The charge thermodynamics includes an original treatment of heat flow between ideal Fermi gases that is derived from their heat capacities. An original discretization scheme based on the properties of Delaunay and Voronoi meshes is also presented. This new scheme allows the field equations to be solved self-consistently ... |
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| Ecological Soil Screening Levels For Invertebrates at Explosives-Contaminated Sites: Supporting Sustainability of Army Testing and Training |
NOV 2006 |
8 pages |
| Authors:
Roman G. Kuperman; Ronald T. Checkai; Michael Simini; Carlton T. Phillips; Jan E. Kolakowski; Nancy A. Chester; EDGEWOOD CHEMICAL BIOLOGICAL CENTER ABERDEEN PROVING GROUND MD
|
| The Army Strategy for the Environment applies an ecosystem approach to managing natural resources on Army installations. It incorporates the principles of sustainability across the Army into all functional areas. We conducted investigations to develop critical environmental data required for successful management of Army installations in a sustainable manner, and for the knowledge-based decision making. Assessment and protection of the terrestrial environment at Army installations can be advanced by developing ... |
|
| Brijuni Conference (10th), Imaging in Space and Time. Held in Brijuni, Croatia on 28 August-1 September 2006 |
01 SEP 2006 |
60 pages |
| Authors:
Slobodan D. Bosanac; INSTITUT RUDJER BOSKOVIC ZAGREB (YUGOSLAVIA)
|
| The Final Abstracts for the Conference, Imaging in Space and Time, 28 August 2006 - 1 September 2006. The conference included: A) Acquiring and analyzing data from space. Much of information on distant objects in space is obtained from images in various frequency domains of electromagnetic radiation. Acquiring and analysis of images was reviewed. B) Nanotechnology for manipulation of light: Future advances in fundamental and applied research are envisaged in ... |
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| Effects of Multiple Scattering on the Implementation of an Underwater Wireless Optical Communications Link |
Sep-2006 |
7 pages |
| Authors:
Alan Laux; Brandon Cochenour; Linda Mullen; Tom Curran; NAVAL AIR SYSTEMS COMMAND PATUXENT RIVER MD
|
| Recent interest in ocean exploration has brought about a desire for developing wireless communication techniques in this challenging environment. Due to its high attenuation in water, a radio frequency (RF) carrier is not the optimum choice. Acoustic techniques have made tremendous progress in establishing wireless underwater links, but they are ultimately limited in bandwidth. A third option is optical radiation, which is discussed in this paper. One drawback of underwater ... |
|
| Assessment of an Active Electromagnetic Sensor for Hunting Buried Naval Mines, Part II |
Sep-2006 |
9 pages |
| Authors:
P J Carroll; W M Wynn; J W Purpura; NAVAL SURFACE WARFARE CENTER PANAMA CITY FL
|
| The US Navy is investigating the use of broadband electromagnetic (EM) sensors as a candidate technology for its Buried Minehunting (BMH) sensor suite. New Navy tactics are being pursued, where short-range sensors are incorporated into reacquisition minehunting systems for short-range classification. The current approach includes study of use of active EM sensors that employ multi-frequency sources for target illumination which can provide valuable multi-spectral discrimination for the classification of buried ... |
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| Remote Sensing of the Refractive Environment Above the Marine Stratocumulus-Topped Boundary Layer |
SEP 2006 |
85 pages |
| Authors:
Dennis T. Derley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Electro-Magnetic propagation paths are subject to refraction as they travel through moisture and temperature gradients found within the inversion layer at the top of the stratocumulus-topped marine boundary layers (STBL). The NPS Meteorology Department is developing an automated program called SEMEO (Satellite Electro-Magnetic Electro-Optical) that will use remote sensors to estimate the cloud-top height, and characterize the ducting conditions over large regions. In addition to estimating the location and strength ... |
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| Time-Resolved Scanning Electron Microscopy |
15 JUN 2006 |
8 pages |
| Authors:
Peter M. Weber; BROWN UNIV PROVIDENCE RI
|
| The project explores the combination of ultrashort pulsed laser technology with electron microscopy. The objective is to build an electron microscope with a pulsed electron beam, in order to observe nanoscale structures with ultrafast time-resolution. The pulsed electron beam is obtained by rapidly switching the electron emission of a field emission tip using the AC electric field arising from exposure to the intense electromagnetic radiation emanating from an ultrashort pulsed ... |
|
| A Case Analysis of Energy Savings Performance Contract Projects and Photovoltaic Energy at Fort Bliss, El Paso, Texas |
JUN 2006 |
165 pages |
| Authors:
William J. Barich; Brent L. Dessing; Antonio B. Harley; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The purpose of this MBA Project is to review existing policy of the Federal Energy Management Program under the purview of National Renewal Energy Laboratory (NREL) for Energy Savings Performance Contracts (ESPCs). This project will assess the ability for the Department of Defense to incorporate emerging technologies in alternative energy to supplement or replace existing power sources for DoD installations within the current Energy Savings Performance Contract policy. To do ... |
|
| Advanced Antenna Pattern Prediction Software |
31 MAY 2006 |
38 pages |
| Authors:
Thomas Jaroszewicz; Elizabeth Bleszynski; Marek Bleszynski; Vladimir Rokhlin; MONOPOLE RESEARCH THOUSAND OAKS CA
|
| The objective of the project was to improve performance of accurate methods for predicting radiation characteristics of antenna mounted on large platforms. Our work concentrated mainly on an attempt of devising a viable computational scheme based on utilization of basis functions defined on large supports, and characterized by strongly collimated radiation patterns; we refer to them as "directional basis functions". The main motivation for introducing the concept of directional basis ... |
|
| Optical Turbulence Effects on Ground to Satellite Microwave Refractivity |
MAY 2006 |
30 pages |
| Authors:
Arnold Tunick; ARMY RESEARCH LAB ADELPHI MD
|
| Due to the increased use of laser and microwave ground-to - satellite communications the need for reliable optical turbulence information is growing. Optical turbulence information is important because it describes an atmospheric effect that can degrade the performance of electromagnetic systems and sensors e.g. free-space optical and microwave communications and infrared imaging. A quantitative measure of the intensity of optical turbulence is the refractive index structure parameter, Cn2. A critical ... |
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| Frequency Selective Materials for Control of Radiated Emissions and Interference Suppression, Phase 2 |
APR 2006 |
25 pages |
| Authors:
Peter Munk; Peter Beyerle; David Michalk; MISSION RESEARCH CORP DAYTON OH
|
| A frequency selective surface was applied to a radome mounted inside the aerodynamic radome of a host vehicle. This inner radome then provided very little attenuation to electromagnetic signals in a narrow band and a specific polarization, but effectively blocked signals outside the band or in the cross polarization. Measured results were nearly identical to theoretical predictions. |
|
| Conference on Mathematical and Numerical Aspects of Waves (WAVES'05) (7th) |
22 MAR 2006 |
3 pages |
| Authors:
Jan S. Hesthaves; BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
|
| This was a grant to cover partial cost of the organization of the 7th International;Conference on Mathematical and Numerical Aspects of Waves, held at Brown University, Providence, RI, on June 2-24. 2005. It was the 7th WAVES conference with the first-one taking place in Strasburg, France in 1991 and every 2nd or 3rd year since then. |
|
| An Optoelectronics Research Center |
08 MAR 2006 |
96 pages |
| Authors:
S. R. Brueck; NEW MEXICO UNIV ALBUQUERQUE
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| The research description contains 5 tasks divided into two general areas The first area is the area of nanomatenals and nanophotonics Two tasks are described there, the first being to understand and develop applications for a new class of nanostructured thin films, the second exploring circumstances in which metal films can transmit a high fraction of an incident electromagnetic wave. The second area of research is in new optoelectronic materials. ... |
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| Comparison of Climatological Optical Turbulence Profiles to Standard, Statistical and Numerical Models Using Heleeos |
MAR 2006 |
117 pages |
| Authors:
Liesebet E. Gravley; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Optical turbulence within earth's atmosphere plays a significant role in electromagnetic radiation propagation from a high energy laser. The index of refraction structure constant, Cn2, characterizes turbulent spatial fluctuations due to temperature gradients. These changes in the index of refraction affect the intensity of the laser wave front on its intended target. It is important to characterize this parameter throughout the atmosphere, the boundary layer and above, for its applications ... |
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Reports by Keyword(s)
ELECTROMAGNETIC RADIATION
