| CARESS: Couples' Arousal Relationship Satisfaction Survey |
FEB 2011 |
12 pages |
| Authors:
Tracey Krupski; Thomas Polascik; VIRGINIA UNIV CHARLOTTESVILLE
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 | The purpose of the study is to assess psychosocial factors (anxiety, depression, body image, fear of recurrence, arousal, libido, erection) simultaneously at an individual level to determine which has the greatest influence on couples' satisfaction. We believe that by identifying patterns of psychosocial adaptation associated with poor relationship satisfaction, we can target couples at risk for significant relationship stress. Through adjusting expectations, psychosocial education, and couples' counseling as necessary, we ... |
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| Numerically Stable Fluid-Structure Interactions Between Compressible Flow and Solid Structures |
28 Jan 2011 |
32 pages |
| Authors:
Jon T Gretarsson; Nipun Kwatra; Ronald Fedkiw; STANFORD UNIV CA
|
| We propose a novel method to implicitly two-way couple Eulerian compressible flow to volumetric Lagrangian solids. The method works for both deformable and rigid solids and for arbitrary equations of state. The method exploits the formulation of [11] which solves compressible fluid in a semi-implicit manner, solving for the advection part explicitly and then correcting the intermediate state to time tn+1 using an implicit pressure, obtained by solving a modified ... |
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| Tungsten Speciation in Firing Range Soils |
JAN 2011 |
82 pages |
| Authors:
Jay L. Clausen; Benjamin C. Bostick; Anthony Bednar; Jing Sun; Joshua D. Landis; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH
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| Synchrotron-based X-ray absorption spectroscopy (XAS) of select surface soil samples obtained from Camp Edwards, Massachusetts, small arms ranges indicate that little tungsten metal remains in the soil and that is not stable in the natural environment. X-ray absorption near edge structure (XANES) studies indicate rapid oxidation of tungsten metal to form tungsten oxides W(VI), polytungstates, tungstates, and polyoxometallates (POM) in any number of forms. Owing to structural similarities, it is ... |
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| Quantum Simulation of the Hexagonal Kitaev Model With Trapped Ions |
Jan 2011 |
25 pages |
| Authors:
Roman Schmied; Janus H Wesenberg; Dietrich Leibfried; NATIONAL INST OF STANDARDS AND TECHNOLOGY BOULDER CO TIME AND FREQUENCY DIV
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| We present a detailed study of quantum simulations of coupled spin systems in surface-electrode (SE) ion-trap arrays, and illustrate our findings with a proposed implementation of the hexagonal Kitaev model (Kitaev A 2006 Ann. Phys. 321 2). The effective (pseudo)spin interactions making up such quantum simulators are found to be proportional to the dipole-dipole interaction between the trapped ions, and are mediated by motion that can be driven by state-dependent ... |
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| Estimating Uncertainties in Bio-Optical Products Derived from Satellite Ocean Color Imagery Using an Ensemble Approach |
Jan 2011 |
11 pages |
| Authors:
Jr Gould Richard W; Sean C McCarthy; Igor Shulman; Emanuel Coelho; James Richman; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| We propose a methodology to quantify errors and produce uncertainty maps for satellite-derived ocean color bio-optical products using ensemble simulations. Ensemble techniques have been used by the environmental numerical modeling community to propagate initialization, forcing, and algorithm error sources through-out the full simulation process, but similar approaches have not yet been applied to satellite optical properties. Uncertainties in retrievals of bio-optical properties from satellite ocean color imagery are related to ... |
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| Effects of Non-Equilibrium Plasma Discharge on Counterflow Diffusion Flame Extinction |
Jan 2011 |
9 pages |
| Authors:
Wenting Sun; Mruthunjaya Uddi; Timothy Ombrello; Sang H Won; Campbell Carter; Yiguang Ju; PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| A non-equilibrium plasma assisted combustion system was developed by integrating a counterflow burner with a nano-second pulser to study the effects of atomic oxygen production on the extinction limits of methane diffusion flames at low pressure conditions. The production of atomic oxygen from the repetitive nano-second plasma discharge was measured by using two-photon absorption laser-induced fluorescence (TALIF). The results showed that both the atomic oxygen concentration production and the oxidizer ... |
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| Theoretical Methods in the Non-Equilibrium Quantum Mechanics of Many Bodies |
2011 |
191 pages |
| Authors:
Andrew B. Robertson; MARYLAND UNIV COLLEGE PARK
|
| A toolbox of theoretical methods pertinent to the study of non-equilibrium many-body quantum mechanics is presented with an eye to specific applications in cold atoms systems and solids. We discuss the generalization from unitary quantum mechanics to the non-unitary framework of open quantum systems. Theoretical techniques include the Keldysh close-time-path integral and its associated correlation functions, the quantum kinetic equation, and numerical integration of equations of motion both unitary and ... |
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| Seamless Military/Civilian Transition: Holding the Operational Force Together |
14 Dec 2010 |
28 pages |
| Authors:
Adam S Roth; AIR WAR COLL MAXWELL AFB AL
|
| This paper will closely examine what is required to make a sustainable operational force as it relates to the career transition enabling a continuum of service . This is a continuum where both the military and employers recognize complementary skill sets that can be utilized interchangeably depending on that individual s duty status. Many Service members have great difficulty communicating their military acquired job skills into recognizable (and coveted) skills ... |
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| Quantum Information Processing with Ferroelectrically Coupled Quantum Dots |
05 DEC 2010 |
13 pages |
| Authors:
Jeremy Levy; Hrvoje Petek; Hong K. Kim; Sanford Asher; PITTSBURGH UNIV PA
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| Progress has been made in several areas of research undertaken by the PI and co-PIs. Research areas include the development of rewritable nanoelectronic devices with potential for quantum information processing, optical characterization of coherent phonons in GaAs, synthesis of monodisperse crystalline colloidal arrays, and development of plasmonic nanoscale waveguides for spectroscopy on a chip applications. |
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| Theoretical Background and Prognostic Modeling for Benchmarking SHM Sensors for Composite Structures |
Oct 2010 |
10 pages |
| Authors:
Vadim Smelyanski; Vasyl Hafiychuk; Dmitry G Luchinsky; Curtis Banks; Chris Conn; Jim Miller; Mike Watson; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION MOFFETT FIELD CA AMES RESEARCH CENTER
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| This paper reports on analytical as well as computer simulation of waves propagating in sandwich-type composite structures. Sandwich-type composites are being studied for use in NASA's new heavy lift launch vehicle, and flaw detection is crucial for safety and for failure prognostics. Theoretical analysis, as well as numerical modeling, is needed for benchmarking of available technologies for structural health monitoring (SHM) sensors and sensor systems. This benchmarking activity is important ... |
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| Numerical Techniques and Cloud-Scale Processes for High-Resolution Models |
30 SEP 2010 |
11 pages |
| Authors:
Jamed D. Doyle; NAVAL RESEARCH LAB MONTEREY CA
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| The long-term goal of this project is to design and evaluate the components that will comprise a next generation mesoscale atmospheric model within the Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS). It is anticipated that in order to meet future Navy requirements, next generation approaches to numerical techniques and physical parameterizations will be needed. The objectives of this project involve the development, testing, and validation of new numerical techniques such as ... |
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| Understanding Resilience in Wounded Warriors and Their Families |
Aug 2010 |
16 pages |
| Authors:
Amy McLean; RESEARCH TRIANGLE INST (RTI) RESEARCH TRIANGLE PARK NC
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| The current study aimed to identify the impact of deployment injury on three measures of family functioning (relationship adjustment, parental stress, and family chaos) as well as on three measures of psychological symptoms of the service member (PTSD, depression, and alcohol use). Spouses of returning NG members and the service members both rated family functioning lower in the face of psychological difficulties experienced by the service member. Physical injury was ... |
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| X-HALE: A Very Flexible UAV for Nonlinear Aeroelastic Tests |
Apr 2010 |
24 pages |
| Authors:
Carlos E Cesnik; Patrick J Senatore; Weihua Su; Ella M Atkins; Christopher M Shearer; Nathan A Pitcher; MICHIGAN UNIV ANN ARBOR DEPT OF AEROSPACE ENGINEERING
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| The University of Michigan has designed and is currently building an unmanned aerial vehicle, denoted X-HALE, which is aeroelastically representative of very flexible aircraft. The objective of this test bed is to collect unique data of the geometrically nonlinear aeroelastic response coupled with the flight dynamics to be used for future code validation. The aircraft will present specific aeroelastic features (e.g., coupled rigid/elastic body instability, large wing deflection during gust, ... |
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| Nonlinear Transient Thermoelastodynamics of Functionally Graded Panels Subjected to Strong Acoustic Excitations |
15 Mar 2010 |
7 pages |
| Authors:
Marc P Mignolet; ARIZONA STATE UNIV TEMPE
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| The focus of this investigation was on the understanding and prediction of the nonlinear geometric (large displacements) dynamic response of functionally graded panels subjected to the severe acoustic, thermal, and mechanical/aerodynamic excitations expected for hypersonic vehicles. The phenomenological analysis centered more specifically on the differences observed in the response of metallic panels and those functionally graded while a pre-existing reduced order modeling strategy was drastically enhanced to provide the needed, ... |
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| Elastic Stress Analysis of Advanced Functionally Graded Plates Impacted by Blast Loading |
18 Jan 2010 |
38 pages |
| Authors:
Terry Hause; ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
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| The foundation of the theory of functionally graded plates with all four edges simply supported, under a Friedlander explosive spherical air-blast, is developed, within the classical plate theory (CPT). The constituent materials, ceramic and metal, vary across the wall thickness according to a prescribed power law. The theory incorporates the geometrical nonlinearities, the dynamic effects, compressive/tensile edge loadings, damping effects, and the structural symmetries (symmetric and asymmetric). The static and ... |
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| Biomarker Use in Tailored Combat Casualty Care |
Jan 2010 |
10 pages |
| Authors:
Trevor S Brown; Shawn Safford; Janet Caramanica; Eric A Elster; NAVAL MEDICAL RESEARCH CENTER SILVER SPRING MD
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| Modern war wounds are complex and primarily involve extremities. They require multiple operative interventions to achieve wound closure and begin rehabilitation. Current assessment of the suitability of surgical wound closure is based upon subjective methods coupled with a semiquantitative determination of the wound bacterial burden. Measurement of the systemic and local response to injury using inflammatory biomarkers may allow for accelerated wound closure and treatment of other combat-related morbidity. This ... |
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| A Multi-Scale Model of the Turkish Straits System |
Jan 2010 |
2 pages |
| Authors:
Cheryl A Blain; Mustafa K Cambazoglu; Ewa Jarosz; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| Two narrow, shallow straits, the Dardanelles and the Bosphorus, form a physical connection between the Marmara Sea and its adjacent water bodies, the Aegean Sea to the southwest and the Black Sea to the northeast. This collection of seas and straits is known as the Turkish Straits System (TSS). Saline, dense water from the Aegean flows in a deep, lower layer through the Marmara Sea to the Black Sea while ... |
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| Evaluation of Wind field Predictions by Atmospheric Models over the Marmara Sea |
Jan 2010 |
2 pages |
| Authors:
Mustafa K Cambazoglu; Cheryl A Blain; Mikdat Kadioglu; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
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| Data collected from meteorological stations in the Turkish Straits System (TSS) around the Marmara Sea are used to assess the performance of atmospheric models in predicting the winds. The Coupled Ocean/Atmosphere Mesoscale Prediction System (COAMPS) is applied using different spatial resolutions ranging between 1 km and 27 km to investigate the effect of model spatial grid resolution on the accuracy of the computed wind field. The influence of ocean dynamics ... |
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| Seeing Many-Body Effects in Single- and Few-Layer Graphene: Observation of Two-Dimensional Saddle-Point Excitons |
2010 |
11 pages |
| Authors:
Kin F. Mak; Jie Shan; Tony F. Heinz; COLUMBIA UNIV NEW YORK DEPT OF PHYSICS
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| Significant excitonic effects were observed in graphene by measuring its optical conductivity in a broad spectral range including the two-dimensional pi-band saddle-point singularities in the electronic structure. The strong electron-hole interactions manifest themselves in an asymmetric resonance peaked at 4.62 eV, which is red-shifted by nearly 600 meV from the value predicted by ab-initio GW calculations for the band-to-band transitions. The observed excitonic resonance is explained within a phenomenological model ... |
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| Targeted Delivery of Carbon Nanotubes to Cancer Cells |
Sep 2009 |
36 pages |
| Authors:
Ellen S Vitetta; Radu Marches; Rockford Draper; TEXAS UNIV AT DALLAS SOUTHWESTERN MEDICAL CENTER
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| The current antitumor strategies, including chemotherapy, radiotherapy, naked and/or conjugated monoclonal antibody (MAb) therapy or combinations of these have major limitations ranging from insufficient cytotoxicity to severe side effects. A potential solution is the use of targeted nanoparticles such as carbon nanotubes (CNTs). CNTs have been demonstrated to possess unique properties including the ability to emit heat when exposed to either near-infrared (NIR) light. The proposal test the possibility to ... |
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| Connectivity of Cognitive Radio Networks: Proximity vs. Opportunity |
Sep 2009 |
24 pages |
| Authors:
Wei Ren; Qing Zhao; Ananthram Swami; CALIFORNIA UNIV DAVIS DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| We address the connectivity of large-scale ad hoc cognitive radio networks in which secondary users exploit channels that are temporarily and locally unused by primary users. In ad hoc cognitive radio networks the existence of a communications link between two secondary users depends not only on the distance between them, but also on the transmitting and receiving activities of nearby primary users. We introduce the concept of connectivity region, which ... |
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| Sound Propagation around Underwater Seamounts |
FEB 2009 |
191 pages |
| Authors:
III Sikora Joseph J.; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| In the ocean, low frequency acoustic waves propagate with low attenuation and cylindrical spreading loss over long-ranges, making them an effective tool for underwater source localization, tomography, and communications. Underwater mountains, or seamounts, are ubiquitous throughout the world's oceans and can absorb and scatter acoustic energy, offering many interesting acoustic modeling challenges. The goal of the research performed in support of this thesis is to measure the acoustic scattered field ... |
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| Resonant Optical Circuits Based on Coupling Between Whispering Gallery Modes in Dielectric Microresonators |
30 DEC 2007 |
23 pages |
| Authors:
Vasily N. Astratov; Wei Cai; Mohamed A.-Hasan; NORTH CAROLINA UNIV AT CHARLOTTE
|
| 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
|
| 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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| Wave Breaking Influence in a Coupled Model of the Atmosphere-Ocean Wave Boundary Layers Under Very High Wind Conditions |
30 SEP 2007 |
13 pages |
| Authors:
Michael L. Banner; Lance M. Leslie; Russel P. Morison; NEW SOUTH WALES UNIV SYDNEY (AUSTRALIA) SCHOOL OF MATHEMATICS
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| The long-term goals are to contribute improvements in current physical understanding and modeling of interfacial processes fundamental to air-sea interaction fluxes, particularly those involving wave breaking and spray droplet production. These advances will improve the reliability of operational sea state and ocean weather forecasting models, particularly for severe to extreme sea states. |
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| Physics-based Parameterizations of Air-sea Fluxes at High Winds Extension of CBLAST |
30 SEP 2007 |
7 pages |
| Authors:
Tetsu Hara; Isaac Ginis; Stephen E. Belcher; RHODE ISLAND UNIV NARRAGANSETT GRADUATE SCHOOL OF OCEANOGRAPHY
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| The long term goal of this project is to provide a new set of parameterizations of air-sea fluxes, which can be used as boundary conditions for high-resolution numerical models of ocean, atmosphere, and coupled ocean/atmosphere systems. The new parameterizations will be constructed based on physical processes of the exchange of mass, momentum, heat, moisture, energy at the interface between the ocean and the atmosphere, and will be valid for the ... |
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| Improving Surface Flux Parameterizations in the NRL Coupled Ocean/Atmosphere Mesoscale Prediction System |
30 SEP 2007 |
8 pages |
| Authors:
Shouping Wang; Qing Wang; NAVAL RESEARCH LAB MONTEREY CA
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| The long-term goal is to understand the physical processes that critically regulate the coupling between the oceanic and atmospheric boundary layers and develop advanced parameterizations of this interaction for a new generation of coupled ocean-atmosphere models. |
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| Coupled Mode Propagation in Elastic Media |
30 SEP 2007 |
10 pages |
| Authors:
Ahmad T. Abawi; Michael B. Porter; HEAT LIGHT AND SOUND RESEARCH INC LA JOLLA CA
|
| Long term goals were to develop an accurate and reliable range-dependent propagation model for propagation in an ocean overlying an elastic bottom based on coupled mode theory. The objective of this effort is to develop, test and validate a range-dependent elastic propagation code by developing a coupled-mode extension to the existing elastic normal mode codes. |
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| Analysis of Near-Surface Oceanic Measurements Obtained During CBLAST-Low |
30 SEP 2007 |
7 pages |
| Authors:
John H. Trowbridge; Albert J. Plueddeman; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| Atmospheric and oceanic measurements obtained during the low-wind component of the Coupled Boundary Layers and Air-Sea Transfer program (CBLAST-Low) are being used to address the Objectives. Trowbridge and Plueddemann are focusing on turbulence statistics and Langmuir 1 circulations, respectively. |
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| Analysis of Near-Surface Atmospheric Measurements Obtained During CBLAST-LOW |
30 Sep 2007 |
8 pages |
| Authors:
James B Edson; CONNECTICUT UNIV AVERY POINT
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| The long-range goal of the proposed research is to understand air-sea interaction and coupled atmospheric and oceanic boundary layer dynamics at low wind speeds where the dynamic processes are driven and/or strongly modulated by thermal forcing. The low wind regime extends from the extreme situation where wind stress is negligible and thermal forcing dominates up to wind speeds where wave breaking and Langmuir circulations are also expected to play a ... |
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| Continued Investigation of Small-Scale Air-Sea Coupled Dynamics Using CBLAST Data |
30 Sep 2007 |
6 pages |
| Authors:
Dick K Yue; MASSACHUSETTS INST OF TECH CAMBRIDGE CENTER FOR OCEAN ENGINEERING
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| Our long-term goal is to obtain a more thorough understanding of the dynamics of coupled boundary layers air-sea transfer (CBLAST) at relatively small spatial scales, by performing direct numerical simulation (DNS) and large-eddy simulation (LES) together with large-wave simulation (LWS) for both air and ocean turbulent flows with surface waves. The primary focus and an ultimate goal is to obtain the physical foundation for the characterization and parameterization of the ... |
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| Quantitative Estimation of Variability in the Underwater Radiance Distribution (RadCam) |
30 Sep 2007 |
10 pages |
| Authors:
Marlon R Lewis; Scott D McLean; SATLANTIC INC HALIFAX (CANADA)
|
| A significant source of uncertainty in the prediction of the apparent optical properties of the ocean is the geometrical distribution of the radiance field and its variation with respect to time and space; this uncertainty directly affects attempts to use measurements of reflectance and attenuation for the diagnosis of ocean constituents. Uncertainties in the time and depth dependent variations in the radiance distribution, and their sources of variation, propagate as ... |
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| An Investigation of the Role of Nutrient Gradients in the Episodic Formation, Maintenance and Decay of Thin Plankton Layers in Coastal Waters |
30 Sep 2007 |
9 pages |
| Authors:
Alfred K Hanson; SUBCHEM SYSTEMS INC JAMESTOWN RI
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| Thin plankton layers are patches of phytoplankton and/or zooplankton that range in thickness from a few centimeters to a few meters yet can extend horizontally for kilometers and persist for days. Recent work has shown that thin layers can be sufficiently intense and persistent to affect the performance of current and planned Navy optical and acoustical sensors. In Hanson and Donaghay (1998) we showed how thin plankton layers are often ... |
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| Investigation of the Acoustics of Marine Sediments using an Impedance Tube |
30 Sep 2007 |
23 pages |
| Authors:
Preston S Wilson; TEXAS UNIV AT AUSTIN APPLIED RESEARCH LABS
|
| The main goal of this project is to increase our understanding of sound propagation in ocean bottom sediments, which in turn benefits buried object detection, sonar operation and acoustic communications in shallow water. Another goal for the out years is to develop the proposed research apparatus into an operational system for in situ classification of ocean bottoms for Naval fleet operations. The primary objective is to obtain experimental measurements of ... |
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| North Pacific Acoustic Laboratory: Scripps Institution of Oceanography |
30 Sep 2007 |
9 pages |
| Authors:
Peter F Worcester; Bruce D Cornuelle; Matthew A Dzieciuch; Walter H Munk; SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
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| The North Pacific Acoustic Laboratory (NPAL) program is intended to improve our understanding of: (1) the basic physics of low-frequency, broadband propagation in deep water, including the effects of oceanographic variability on signal stability and coherence, (2) the structure of the ambient noise field in deep water at low frequencies, and (3) the extent to which acoustic methods, together with other measurements and coupled with ocean modeling, can yield estimates ... |
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| Incorporating Optics into a Coupled Physical-Biological Forecasting System in the Monterey Bay |
30 Sep 2007 |
9 pages |
| Authors:
Fei Chai; Emmanuel Boss; Yi Chao; MAINE UNIV AT ORONO SCHOOL OF MARINE SCIENCES
|
| Modeling and predicting ocean optical properties for coastal waters requires linking optical properties with the physical, chemical, and biological processes in the upper ocean. Our long-term goal is to incorporate optical processes into coupled physical-biological models for coastal waters, develop and improve integrated ocean forecasting systems, including prediction of ocean optical properties. |
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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)
|
| 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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| Second Generation Superconducting Wires for Power Applications (Postprint) |
Jan 2007 |
31 pages |
| Authors:
G A Levin; P N Barnes; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH
|
| We review conceptual and experimental explorations of magnetization losses in multifilament, multiply connected coated superconductors exposed to time-varying magnetic field. In these conductors the superconducting layer is divided into parallel stripes segregated by non-superconducting grooves. In order to facilitate the current sharing between the stripes and thus increase their reliability, a sparse network of superconducting interfilament bridges needs to be introduced. We find that the presence of the bridges does ... |
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| Fiber Laser Arrays |
03 MAY 2006 |
62 pages |
| Authors:
Thomas B. Simpson; L-3 COMMUNICATIONS TITAN CORP SAN DIEGO CA
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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
|
| 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 |
9 pages |
| 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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