| Resonant Optical Circuits Based on Coupling Between Whispering Gallery Modes in Dielectric Microresonators |
30 DEC 2007 |
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| Authors:
Vasily N. Astratov; Wei Cai; Mohamed A.-Hasan; NORTH CAROLINA UNIV AT CHARLOTTE
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 | The project was devoted to advancing understanding of the optical properties of mesoscopic systems of coupled spherical cavities. Using numerical modeling we studied optical coupling between spherical cavities with detuned whispering gallery mode (WGMs) resonances. The results were found to be in agreement with experiments performed on size-mismatched bispheres with controllable inter-cavity gaps. We observed a new type of optical modes termed "nanojet-induced modes" in straight chains of microspheres. Due ... |
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| Dual Mechanism Nonlinear Response of Selected Metal Organic Chromophores |
01 OCT 2007 |
146 pages |
| Authors:
John D. Peak; FLORIDA UNIV GAINESVILLE
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 | 13 The goal for the research described herein is the development of a series of transition metal based metal organic chromophores that display both two-photon and excited state absorption (TPA/ESA) character. With this goal in mind, we present the preparation and photophysical characterization for a series of metal-organic chromophores containing a two photon absorbing bipyridine core combined with a transition metal component which yields a long-lived triplet excited state. The ... |
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| Controlled Precipitation of Radiation Belt Particles |
23 AUG 2007 |
18 pages |
| Authors:
Umran S. Inan; Timothy F. Bell; Timothy W. Chevalier; STANFORD UNIV CA SPACE TELECOMMUNICATIONS AND RADIOSCIENCE LAB (STAR)
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| The overall objectives of this work are to: * Quantify the requirements for controlled precipitation of radiation belt particles in order to mitigate space particle effects * Address the issue of coupling of space based antennas to the surrounding magnetoplasma for use in system design * Determine radiated power from single transmitting element The completion of these goals requires the design of antenna-in-plasma codes which simulate the interaction of radiating ... |
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| Fiber Laser Arrays |
03 MAY 2006 |
62 pages |
| Authors:
Thomas B. Simpson; L-3 COMMUNICATIONS TITAN CORP SAN DIEGO CA
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| Experiments have been conducted to investigate the feasibility and scalability of coherent laser output from an array of fiber lasers with strong intracavity coupling. A flexible, reconfigurable experimental apparatus has been modified and configured for these investigations. Measurements taken with this apparatus during this program showed that nonlinear optical interactions in long-cavity, coherently coupled fiber laser arrays do not destroy the high efficiency coherent combining. In fact, by spreading the ... |
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| Coherent Quantum Control of Multidimensional Vibrational Spectroscopy |
MAY 2006 |
9 pages |
| Authors:
Shaul Mukamel; Frantisek Sanda; Upendra Harbola; Ravi Venkatramani; Dmitri Varonine; CALIFORNIA UNIV IRVINE DEPT OF CHEMISTRY
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| The difference frequency generation (DFG) signal from a two electronic level system with vibrational modes coupled to a Brownian oscillator bath was computed. Simulations of two-dimensional DFG signals illustrated how the ground and excited electronic state resonances may be distinguished. Factorial moments of photon counting statistics from a single molecule coupled to a quantum bath were expressed in terms of multipoint quantum correlation functions and represented by double-sided Feynman diagrams. ... |
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| Multiple Channel Laser Beam Combination and Phasing Using Stimulated Brillouin Scattering in Optical Fibers |
22 DEC 2005 |
176 pages |
| Authors:
Brent W. Grime; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Brightness scaling lasers using stimulated Brillouin scattering (SBS) in optical fibers is explored. A multiple-channel amplifier approach is used to increase the total power of a laser system while avoiding a significant burden on a single channel. The work explores two approaches utilizing both SBS beam cleanup and SBS piston error conjugation. A unique beam combiner that takes advantage of the SBS beam cleanup properties of a long, gradient-index multimode ... |
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| COAMPS Simulations of the Coastal Atmosphere |
DEC 2005 |
3 pages |
| Authors:
Eric D. Skyllingstad; Roger M. Samelson; OREGON STATE UNIV CORVALLIS
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| Work has focused primarily on simulations of the coastal atmosphere, and on building a coupled regional ocean-atmosphere model, based on the Naval Research Laboratory - COAMPS and Rutgers/UCLA ROMS models, for use on multiple processor, cluster systems. Progress to date includes the development of a processor management code module using the Model Coupling Toolkit (MCT) (Argonne National Laboratory). The management module is able to run both COAMPS and ROMS on ... |
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| Multiple Channel Laser Beam Combination and Phasing Using Stimulated Brillouin Scattering in Optical Fibers |
DEC 2005 |
177 pages |
| Authors:
Brent W. Grime; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Brightness scaling lasers using stimulated Brillouin scattering (SBS) in optical fibers is explored. A multiple-channel amplifier approach is used to increase the total power of a laser system while avoiding a significant burden on a single channel. The work explores two approaches utilizing both SBS beam cleanup and SBS piston error conjugation. A unique beam combiner that takes advantage of the SBS beam cleanup properties of a long, gradient-index multimode ... |
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| Collision Physics in Atmospheric Pressure Non-Equilibrium Plasmas |
JUN 2005 |
4 pages |
| Authors:
Alfred Z. Msezane; CLARK ATLANTA UNIV GA DEPT OF PHYSICS
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| Recently, a new aspect of interchannel coupling has been found 1, known as spin-orbit activated interchannel coupling, stimulated by an experimental study on photoionization of Xe in the vicinity of the 3d threshold. This effect results only through the spin-orbit splitting of inner-shell thresholds. Effects of spin-orbit activated interchannel coupling on nondipole 2 photoelectron angular distribution asymmetry parameters have been discussed, including the spin-polarization of photoelectrons from 3d electrons of ... |
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| Generation of High Frequency P and S Wave Energy by Rock Fracture During a Buried Explosion: Its Effect on P/S Discriminants at Low Magnitudes |
01 DEC 2004 |
23 pages |
| Authors:
Charles G. Sammis; UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES
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| High stresses in the source volume of an underground explosion produce a shell of crushed and fractured rock surrounding the shot point. We have modeled this process using a micro-mechanical damage mechanics in an effective medium source model to calculate the nucleation, growth, and interaction of fractures from an array of preexisting flaws. We have found that the nucleation and growth of fracture damage generates secondary seismic radiation that can ... |
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| Topology Optimization for the Design of 3-D Microelectromechanical Systems (MEMS) Undergoing Coupled Multiphysics Phenomena |
30 NOV 2004 |
11 pages |
| Authors:
Martin L. Dunn; COLORADO UNIV AT BOULDER DEPT OF MECHANICAL ENGINEERING
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| We developed, implemented, and validated new topology optimization strategies/algorithms for the design of microelectromechanical systems (MEMS) exhibiting coupled multiphysics behavior. The numerical tools include a fully coupled nonlinear electro-thermo-mechanical and electrostatic-mechanical finite element solvers, and novel sensitivity analysis modules that allow the evaluation of the gradients of the coupled response with respect to a large number of optimization variables. These tools have been integrated into the overall topology optimization design ... |
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| The Use of Alum Mixtures for Removal and Decontamination of VX and QL In Aqueous Solutions |
16 NOV 2004 |
8 pages |
| Authors:
Daniel J. Williams; Vicky L. Bevilacqua; William R. Creasy; David J. McGarvey; Jeffrey S. Rice; Christopher L. DeLeon; Melanie J. Sanders; H. D. Durst; GEO-CENTERS INC ABERDEEN PROVING GROUND MD
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| Truly environmentally friendly means of detoxifying chemical warfare agents have yet to be developed. Toward this end, O-ethyl-S- [2 -( diisopropylamino) ethyl] methylphosponothiolate (VX) and its precursor, O-ethyl-O' -[(2-isopropylamino)ethyl] methylphosphonite (QL), were treated with aqueous aluminum sulfate (alum), sodium aluminate, or mixtures of the two. The mixtures were prepared by combining varying volumes of the aqueous salts to give buffered solutions (pH 2-12). Reactions were tracked using phosphorus-31 nuclear magnetic ... |
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| Analysis of Russian Hydroacoustic Data |
NOV 2004 |
190 pages |
| Authors:
Mariana Eneva; Jeffry L. Stevens; John Murphy; SCIENCE APPLICATIONS INTERNATIONAL CORPSAN DIEGO CA
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| The objective of this project is to better understand the coupling of energy from explosions near the water surface. The Institute of Dynamics of the Geospheres (ITG) has provided unique historical hydroacoustic data from Russian archives, featuring various combinations of depths of explosion. and distances and depths of recording. We analyze and model peak pressure measurements and hydrophone records from two underwater and one above-water nuclear explosions in Novaya Zemlya, ... |
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| Optical Processes in High-Q Semiconductor Microcavities |
22 MAR 2004 |
15 pages |
| Authors:
Hailin Wang; OREGON UNIV EUGENE DEPT OF PHYSICS
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| This final progress report summarizes research efforts in two areas: cavity QED of quantum dots and electromagnetically induced transparency (EIT) in GaAs quantum wells. Cavity QED studies are based on the development of a composite nanocrystal-microsphere system, in which CdSe/ZnS core/shell nanocrystals couple to whispering gallery modes (WGMs) in a fused silica microsphere. The composite microcavity system can feature a Q-factor as high as 108 and a nanocrystal decoherence rate ... |
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| U.S. GODAE: Global Ocean Prediction with the Hybrid Coordinate Ocean Model (HYCOM) |
2004 |
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| Authors:
Eric P. Chassignet; MIAMI UNIV FL INST OF MARINE AND ATMOSPHERIC SCIENCES
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| The main objective is to use the HYbrid Coordinate Ocean Model (HYCOM) with data assimilation in an eddy-resolving, fully global ocean prediction system with transition to the Naval Oceanographic Office (NAVOCEANO) at .08 deg equatorial (~7 km mid-latitude) resolution in 2007 and .04 deg resolution by 2011. The model will include shallow water to a minimum depth of 5 m and provide boundary conditions to finer resolution coastal and regional ... |
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| Medical Ultrasound Technology Research and Development at the University of Washington Center for Industrial and Medical Ultrasound |
02 OCT 2003 |
18 pages |
| Authors:
Lawrence A. Crum; UNIV OF WASHINGTON SEATTLE APPLIED PHYSICS LAB
|
| This grant provided support to expand the scientific program and infrastructure at the University of Washington's Center for Industrial and Medical Ultrasound (CIMU). The many disparate facilities and technical capabilities available to CIMU staff and students were integrated and enhanced to provide a world-class, advanced research center for bioengineering development and graduate education in high-intensity, focused ultrasound (HIFU). This included leveraging of overall research in understanding of acoustic hemostasis and ... |
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| Specific and Selective Biosensor for Salmonella and Its Detection in the Environment |
15 AUG 2003 |
37 pages |
| Authors:
Eric V. Olsen; AUBURN UNIV AL
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| The specific and selective detection of Salmonella typhymurium based on the use of a polyclonal antibody immobilized by the Langmuir-Blodgett method on the surface a quartz crystal acoustic wave device was demonstrated in liquid samples. These biosensors were selective to Salmonella typhymurium in the presence of large concentrations of Escherichia coli 0157:H7. They were also specific to Salmonella typhymurium since bacteria preincubated with free antibody produced no signal. Dark-field and ... |
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| A New Tunable Source for the FIR-THz Spectral Region |
26 JUN 2003 |
10 pages |
| Authors:
James H. Brownell; DARTMOUTH COLL HANOVER NH DEPT OF PHYSICS AND ASTRONOMY
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| The Grating Coupled Oscillator (GCO) has the potential to be a practical coherent source for far-infrared/terahertz (FIR/THz) research and applications. The GCO, simply an electron beam skimming a diffraction grating, has inherently many desirable features: continuously tunable from microwave to visible, continuous wave at room temperature, excellent spatial and spectral quality, stable, compact, robust, simple, and economical. Alternative sources (e.g. solid-state, short-pulse optical switches, free-electron lasers, and blackbody) do not ... |
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| Approach for Coupled Heat Transfer/Heat Flux Calculations |
MAR 2003 |
11 pages |
| Authors:
Stephan Bock; MTU AERO ENGINES GMBH MUNCHEN (GERMANY)
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| Coupled CFD/FE heat transfer / heat flux calculations for material temperature prediction with independent grids expose the need to exchange boundary condition information between the fluid and the solid domain. The author introduces a method of storing the boundary condition information together with the geometry information, where boundary conditions are represented by a set of geometric entities. This method of "virtual boundary conditions" simplifies some aspects of the coupled calculations ... |
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| Applied Computational Electromagnetics Society Journal. Volume 17, Number 3 |
NOV 2002 |
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| Authors:
Atef Z. Elsherbeni; APPLIED COMPUTATIONAL ELECTROMAGNETICS SOCIETY UNIVERSITY MS
|
| The Applied Computational Electromagnetics Society (ACES) Journal hereinafter known as the ACES Journal is devoted to the exchange of information in computational electromagnetics, to the advancement of the state-of-the art, and the promotion of related technical activities. A primary objective of the information exchange is the elimination of the need to "reinvent the wheel" to solve a previously-solved computational problem in electrical engineering, physics, or related fields of study. The ... |
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| Nonlinear Acoustic Techniques for Land Mine Detection |
APR 2002 |
8 pages |
| Authors:
Murray S. Korman; James M. Sabatier; NAVAL ACADEMY ANNAPOLIS MD
|
| When airborne sound couples into the ground seismic waves can interact with a target buried in the soil and effect the vibration velocity of the surface. Acoustic-to-seismic coupling (using linear acoustic techniques) has proven to be an extremely accurate technology for locating buried land mines [J. M. Sabatier and N. Xiang, IEEE Trans. Geoscience and Remote Sensing 39, 1146-1154 (2001)] . Donskoy [SPIE Proceedings 3392, 211-217 (1998); 3710, 239-246 (1999)] ... |
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| Vertical Coupling and Variability in the Tropical Atmosphere/Ionosphere System |
31 MAR 2002 |
5 pages |
| Authors:
Jeffrey M. Forbes; COLORADO UNIV AT BOULDER
|
| The main objective of this research was to understand the processes that dynamically couple the troposphere at equatorial tropical latitudes with the overlying thermosphere-ionosphere. and identify those aspects of ionospheric variability which may be directly attributable to these processes. Using a combination of data analyses and numerical simulations, a new understanding of the excitation mechanisms, propagation characteristics, and lower thermosphere perturbations relating to tropospherically-excited Kelvin waves and nonmigrating tides has ... |
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| Stationaeres und instationares Verhalten von zwei gekoppelten Waermeuebertragern mit umlaufendem Fluidstrom (Stationary and Non-Stationary Behavior of Two Coupled Heat Exchangers with Circuitous Fluid Flow) |
NOV 2001 |
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| Authors:
Chakkrit NaRanong; UNIVERSITAET DER BUNDESWEHR HAMBURG (GERMANY) FACHBEREICH MASCHINENBAU
|
| This dissertation covers the following subjects: the optimization of stationary usage; methods of approach in the testing of non-stationary behavior, including basic equations; calculation of non-stationary behavior with the Laplace transformation; calculation of non-stationary behavior using the Finite Difference method; examples of non-stationary behavior. The final chapter is a summary of the test results, divided categorically: stationary terminal state; differential equations for the calculation of fields of dimensionless temperature fluctuations; ... |
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| Pulse Propagation and Bistatic Scattering |
26 OCT 2001 |
107 pages |
| Authors:
Lawrence J. Ziomek; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A set of pulse-propagation coupling equations is derived. They couple the output electrical signal at a point element in a receive array to the transmitted electrical signal at the input to a transmit array via the complex frequency response of a fluid medium (e.g., air or water). The pulse-propagation coupling equations are based on linear, time-variant, space-variant, filter theory, the principles of complex aperture theory and array theory, and solving ... |
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| Model Clamp: A Computer Tool to Probe Action Potential Transfer Between Cardiac Cells |
25 OCT 2001 |
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| Authors:
Ronald Wilders; Arie O. Verkerk; E. E. Verheijck; Antoni C. van Ginneken; Rajiv Kumar; AMSTERDAM UNIV (NETHERLANDS) DEPT OF PHYSIOLOGY
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| In the early nineties, Joyner and coworkers introduced the "coupling clamp" technique in which an isolated cardiac cell can be electrically coupled to either another isolated cardiac cell or to an analog model cell (RC circuit). In brief, an amplifier system does a continuous analog computation of the current that would be flowing between the two cells if there had been an intercellular coupling conductance G(c), and then pro- vides ... |
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| Chemical Kinetics and Aerodynamics of Ignition |
04 OCT 2001 |
16 pages |
| Authors:
Chung K. Law; PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
|
| The importance of auto- and forced ignition in the operation of practical combustion devices such as the Diesel engine suggests that better understanding and enhanced performance of these devices rely on knowledge of the separate and coupled roles of the complex chemical kinetics and unsteady and turbulent aerodynamics that are present in such systems. This investigation adopted the counterflow configuration, with its well defined flow time, and employed laser-based experimentation, ... |
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| Investigation of a New Class of Low-Profile Multi-Layer Printed Antennas |
OCT 2001 |
32 pages |
| Authors:
Ahmad Hoorfar; VILLANOVA UNIV PA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| The annual reports, previously submitted to the ONR in 1998, 1999 and 2000, have detailed most of our research work on this project. The present report only covers the progress made during the October 2000 - September 2001 interim period. We have made progress in the following area: (1) The previously developed multi-layered gain enhancement technique for printed antennas has been extended to design of proximity-fed and aperture-fed antennas for ... |
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| Regulation of Alternative Splicing in Tumor Metastasis |
OCT 2001 |
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| Authors:
Benjamin Blencowe; TORONTO UNIV (ONTARIO)
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| Deregulation of pre-mRNA processing has been linked to malignant transformation and the formation of metastases in breast and other cancers. We are studying the role of a group of proteins that contain domains rich in alternating serine and arginine residues (RS domains) in pre-mRNA processing. RS domain proteins comprise members of the "SR family" and "SR-related" proteins, which function in both constitutive and regulated splicing. The past three years of ... |
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| Analysis and Numerical Solution of an Integral Equation Method for Electromagnetic Scattering From a Cavity in a Ground Plane |
SEP 2001 |
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| Authors:
Eric T. Howe; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| In this research the electromagnetic scattering of a plane wave from a two-dimensional cavity embedded in an infinite, perfectly conducting ground plane is investigated. The plane wave is assumed to be under transverse electric (TE) polarization with respect to the x-axis. The cavity may be empty or filled with an arbitrary homogeneous, loss material. A coupled set of scalar integral equations that govern the electromagnetic scattering is implemented. An approximate ... |
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| Long-Term Evolution and Coupling of the Boundary Layers in the Stratus Deck Regions of the Eastern Pacific (STRATUS) |
JUN 2001 |
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| Authors:
Lisanne Lucas; Bryan S. Way; Robert A. Weller; Paul R. Bouchard; William M. Ostrom; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
|
| A surface mooring was deployed in the eastern tropical Pacific west of northern Chile from the R/V Melville as part of the Eastern Pacific Investigation of Climate (EPIC). EPIC is a CLIVAR study with the goal of investigating links between sea surface temperature variability in the eastern tropical Pacific and climate over the American continents. Important to that goal is an understanding of the role of clouds in the eastern ... |
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| Controlling Spontaneous Emission in Semiconductor Microcavities |
24 FEB 2001 |
6 pages |
| Authors:
Galina Khitrova; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| John Prineas was the student supported by this AASERT. In our Progress Reports of July 31, 1998 and June 30, 1999, he described his research on radiatively coupled quantum wells with narrow excitation linewidths (^<0.6 meV) and with periods in the vicinity of half the wavelength of light in the semiconducting material (X012n 830 nm/(2x3.6) 115 nm) 1-8 John won a Dean's Fellowship, so he no longer needed AASERT support ... |
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| 97-AASERT Controlling Spontaneous Emission in Semiconductor Microcavities |
24 FEB 2001 |
6 pages |
| Authors:
Galina Khitrova; ARIZONA UNIV TUCSON OPTICAL SCIENCES CENTER
|
| John Prineas was the student supported by this AASERT. In our Progress Reports of July 31, 1998 and June 30, 1999, he described his research on radiatively coupled quantum wells with narrow exciton linewidths (approx. <0. 6 meV) and with periods in the vicinity of half the wavelength of light in the semiconducting material (X012n 830 nm/(2x3.6) 115 nm). 1-8 John won a Dean's Fellowship, so he no longer needed ... |
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| Laser-Based Ultrasound for Remote and Limited-Access Inspection Applications |
DEC 2000 |
112 pages |
| Authors:
Robert C. Addison Jr.; Andrew D. W. McKie; ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CA SCIENCE CENTER
|
| The design, implementation, and proof-of-concept demonstration of a fiber-based Cassegrain optical scanning system was completed. Optical generation and detection with the fiber-based Cassegrain optical scanning system over 100-m lengths of optical fiber was demonstrated. High peak power, Q-switched Nd:YAG laser pulses (>45 mJ/pulse at 532 nm) through optical fiber in a robust manner was successfully delivered. This program established the absolute thermoelastic generation efficiency for four different laser wavelengths and ... |
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| Exploratory Use of VR Technologies for Training Helicopter Deck-Landing Skills |
01 NOV 2000 |
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| Authors:
Lochlan E. Magee; DEFENCE AND CIVIL INST OF ENVIRONMENTALMEDICINE DOWNSVIEW (ONTARIO)
|
| Canadian Forces (CF) pilots and landing safety officers require intensive training to develop the individual and team skills required for safe helicopter deck landings. These skills are currently acquired at sea, following individual training with independent simulators unequipped with visual displays. DCIEM is exploring the feasibility of using commercial, off-the-shelf technologies as the essential components for simulators for training the pilot of the Sea King helicopter and the landing safety ... |
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| THz Sources Based on Semiconductor Quantum Structures |
29 SEP 2000 |
3 pages |
| Authors:
Karl Unterrainer; J. Ulrich; R. Zobl; G. Strasser; E. Gornik; TECHNISCHE UNIV VIENNA (AUSTRIA) INST FUER FESTKOERPERELEKTRONIK
|
| We present a study on spontaneous THz emission from semiconductor quantum structures. THz emission from parabolically graded AlGaAs/GaAs quantum wells driven by an in-plane electric field has been measured. We have analyzed the grating coupled radiation in the temperature range from 20 K to 240 K. The peak emission corresponds to the intersubband plasmon in the parabolic potential. From a quantum cascade structure we observe spontaneous THz emission, based on ... |
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| Novel Proteoglycan-Based Therapies for Breast Cancer |
SEP 2000 |
|
| Authors:
Ralph D. Sanderson; ARKANSAS UNIV FOR MEDICAL SCIENCES LITTLE ROCK
|
| Heparan sulfate proteoglycans (HSPGs) are a new class of tumor suppressors. The focus of this project is to test novel proteoglycan based therapies for the treatment of breast cancer. In the first objective, the ability of neoproteoglycans (nPGs) to mimic the anti-tumor activities of naturally occurring proteoglycans is evaluated. In the first year we have successfully produced nPGs with different glycosaminoglycan chains coupled to a protein scaffold. SDS-PAGE analysis confirms ... |
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| Nonlinear Optics and Nonlinear Dynamics in Semiconductor Lasers Subject to External Optical Injection |
31 JUL 2000 |
124 pages |
| Authors:
Thomas B. Simpson; JAYCOR SAN DIEGO CA
|
| This Phase II SBIR effort investigates novel output characteristics of semiconductor lasers that can be induced by external optical injection. Specific interest is in characteristics relevant to the control of microwave and millimeter-wave electronics through enhanced modulation characteristics, characterization of vertical cavity surface emitting laser (VCSEL) arrays, and analysis of chaotic dynamics that can be induced by optical injection. Under external optical injection, all semiconductor ... |
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| Unicoat Airplane Coatings Systems: Corrosion Resistant Ceramer Coatings |
30 JUN 2000 |
|
| Authors:
Mark D. Soucek; NORTH DAKOTA STATE UNIV FARGO
|
| The objective of this research project is to provide better adhesion and corrosion protection to metal substrates utilizing a self-priming Unicoat system. The overall goal of this project is to replace the environmentally hazardous chromium treatment with the environmentally friendly ceramer coatings without sacrificing corrosion protection. In our approach, new Unicoat formulations were prepared using a polyurethane/siloxane ceramer system. The ceramer coatings were formulated ... |
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| Improved Mammographic Technique for Breast Cancer Diagnosis |
AUG 1999 |
75 pages |
| Authors:
Heang-Ping Chan; MICHIGAN UNIV ANN ARBOR
|
| During the entire project period, we have completed the following tasks: (1) Develop computerized breast border detection and classification scheme. (2) Develop and evaluate exposure equalization filters. (3) Monte Carlo modeling of mammographic imaging systems and optimization of imaging techniques. (4) Design and build breast-tissue-equivalent phantoms for x-ray and ultrasound imaging. (5) Evaluate effects of equalization on image quality. (6) Develop a novel combined x-ray ... |
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| A Structural Damping Technique Based on Coupling Structures with Electronic Circuits |
25 JUN 1999 |
9 pages |
| Authors:
Mark J. Schulz; P. F. Pai; Ali H. Nayfeh; NORTH CAROLINA AGRICULTURAL AND TECHNICAL STATE UNIV GREENSBORO
|
| This project investigated a novel active structural damping technique using PZT (lead zirconate titanate) patches as actuators/sensors and the internal resonance and saturation phenomena of multiple degree-of-freedom systems to suppress transient and steady-state vibrations of structures. The strategy consists of introducing second-order controllers and coupling them to the structure through a sensor and an actuator, where both the feedback and control signals are quadratic. Analytical, ... |
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| Nucleoprotein-Based Nanoscale Fabrication |
31 DEC 1998 |
5 pages |
| Authors:
Steven S. SMith; D. J. Baker; J. A. Wendel; A. Laayoun; L. Niu; D. S. Joy; CITY OF HOPE NATIONAL MEDICAL CENTER DUARTE CA
|
| We have provided a clear demonstration of each of the essential scientific principles governing this approach to macromolecular assembly. First, we have shown that the coupling reaction between methyltransferases and 5-FdC in DNA provides a mechanism for stable attachment of methyltransferases and chimeric methyltransferase fusion proteins in a pre-selected arrangement along a DNA molecule. In the course of this work we discovered that the FdC dramatically slows the rate of ... |
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| Optimal Design of Nonlinear Shock Isolation for Large, Locally NonlinearStructural Systems |
DEC 1998 |
103 pages |
| Authors:
Brian R. Durant; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The method of Time Domain Structural Synthesis is reviewed and examples of linear structural modification and sub-structure coupling are presented. The general formulation for both linear and nonlinear syntheses are compared to highlight the similarities between the two and the difficulties experienced with the introduction of nonlinear elements. Examples of linear and nonlinear sub-structural coupling are presented to emphasize the similarity of the procedures ... |
|
| Supplement for Ultrafast Dynamics of Energetic Additives in O2 Clusters |
27 AUG 1998 |
7 pages |
| Authors:
W. C. Lineberger; JOINT INST FOR LAB ASTROPHYSICS BOULDERCO
|
| Extensive theoretical and experimental studies of the photochemistry of energetic cluster ions and the dynamics of molecular reactions within size- selected clusters have been carried out over the past three years. Photodetachment, photoelectron spectroscopy and photodissociation spectroscopy have been utilized to determine the structure of transient species: Incoherent control of reaction products in a cluster ion containing 35 atoms has been demonstrated and, ... |
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| Theory and Computation of Multilayer Composites |
24 JUL 1998 |
|
| Authors:
E. Stein; J. Tessmer; HANNOVER UNIV (GERMANY F R)
|
| An hierarchical concept for the analysis of thin-walled composite shells is presented within the finite element method for nonlinear deformation of thin-walled composite structures. For non-disturbed subdomains of the structure an effective 4-node shell element with 5 or 6 d.o.f. per node is used for the whole laminate. For the analysis of 3D-stress states a multidirector shell element along the thickness with piecewise polynomials is presented. n physical layers are ... |
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| Concept for a Special Operations Planning and Analysis System |
JUN 1998 |
83 pages |
| Authors:
Alian L. Bilyeu; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This thesis designed and partially implemented a platform independent mission planning and analysis system for the United States Special Operations Command (USSOCOM). The ability to move to platform independent technologies is particularly meaningful for the special operations community that could never expect to move to a standardized computer planning system for their joint, multi-national, and inter-agency operations. This thesis also investigates the ability to integrate legacy systems in an open ... |
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| Narrow Band Susceptibility Prediction from the Impulse Scatter Response of a Pseudomissile (Case I) |
APR 1998 |
82 pages |
| Authors:
Jayme B. Henderson; ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM SURVIVABILITY/LETHALITY ANALYSIS DIRECTORATE
|
| A comparison is made between the narrow band signal coupled into and the impulse signal scattered from a pseudomissile (case I) test object. Simple linear scattering measurement techniques and computational algorithms are presented for the extraction and processing of the scattered signal. The information collected consists of the modal response of the test object to the incident electromagnetic field. A comparison of this impulse scatter data and the narrow band ... |
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| Shielding Effectiveness of a Thin Film Window |
APR 1998 |
69 pages |
| Authors:
Eric Johnson; Wesley Turner; AIR FORCE RESEARCH LAB KIRTLAND AFB NMDIRECTED ENERGY DIRECTORATE
|
| The thin film investigated was designed to protect infra-red (IR) systems from electromagnetic interference (EMI), yet allow IR to pass through the thin film window. This experiment measured the properties of a thin film developed by Sienna Technologies, Inc., through a Phase II Small Business Innovative Research (SBIR) program. The objectives of this SBIR were to shield the system from EMI by at least 20 dB from 400 MHz to ... |
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| Observations from T-Phases from Pacific Earthquake Events: Implications for Seismic/Acoustic Coupling |
12 NOV 97 |
33 pages |
| Authors:
Catherin DEGroot-Hedlin; John Orcutt; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
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| This report presents the results of a study of the coupling of seismic energy to the SOFAR channel and the propagation of acoustic energy from source to receiver. The results of an investigation of T-phase amplitude level vs. earthquake magnitude are presented for events in the Pacific ocean. The poor correlation between these parameters suggests that the generation of detectable T-phases is dependent not only upon event magnitude and depth, ... |
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| Reactive Quantum Scattering in Two Dimensions |
04 NOV 97 |
181 pages |
| Authors:
Roy S. Calfas; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF ENGINEERING PHYSICS
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| In an effort to develop a more efficient time dependent approach for calculating scattering matrix elements, absorbing boundary conditions are combined together with the channel packet method. As an introduction to scattering, scattering matrix elements are presented for a one-dimensional square well and a one-dimensional potential consisting of a Gaussian well with symmetric Gaussian barriers. Next, the combination of the channel packet method together with absorbing boundary conditions yields an ... |
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| Immobilization and Testing of Proteins on Microsensors |
JUL 97 |
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| Authors:
James P. Chambers; Darrel E. Menking; Roy G. Thompson; James J. Valdes; TEXAS UNIV AT SAN ANTONIO
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| Proteins were covalently immobilized onto surfaces using various techniques, including chemical coupling using glutaraldehyde or via biotin- streptavidin. Testing of a receptor-based biosensor system was accomplished using the 1,4-Dihydropyridine receptor. Antibody-based testing included detection of botulinum toxin and Mojave toxin, Hybridized DNA was used to determine the feasibility of detection of bacteria using gene probes. Antibody and DNA detection were tested on fiber optic (evanescent wave sensor) and potentiometric (light ... |
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