| Growth Stress in Si02 Formed by Oxidation of SiC (Preprint) |
Jul 2012 |
8 pages |
| Authors:
Randall S Hay; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
 | Growth stresses in amorphous SiO2 scales formed during SiC fiber oxidation were calculated. A numerical method using Deal-Grove oxidation kinetics and shear-stress dependent SiO2 viscosity was used. Initial compressive stresses in SiO2 of 25 GPa from the 2.2? oxidation volume expansion rapidly relaxes. At 1200?, viscous flow of amorphous SiO2 further relaxes stress to negligible levels. At 700? - 900?C, axial and hoop stress at the GPa level persist in ... |
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| Erosion Control and Environment Restoration Plan Development, Matagorda County, Texas. Phase 1: Preliminary Investigation |
Jul 2012 |
113 pages |
| Authors:
Robert Thomas; Lauren Dunkin; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| This report documents the investigation of coastal processes and development of conceptual alternatives to reduce beach erosion at two sites in Matagorda County. Sargent Beach has experienced the greatest erosion rates on the Texas Coast, prompting study into structural methods to protect beach habitat. Additionally, the three miles of beach to the east of the Mouth of the Colorado River is a candidate for structural stabilization. The proximity of the ... |
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| Influences On The Oceanic Biogeochemical Cycling Of The Hybrid-Type Metals: Cobalt, Iron, And Manganese |
Feb 2012 |
300 pages |
| Authors:
Abigail E Noble; MASSACHUSETTS INST OF TECH CAMBRIDGE JOINT PROGRAM IN APPLIED OCEAN SCIENCE AND ENGINEERING
|
| Trace metal cycling is one of many processes that influence ocean ecosystem dynamics. Cobalt, iron, and manganese are redox active trace metal micronutrients with oceanic distributions that are influenced by both biological and abiotic sources and sinks. Their open ocean concentrations range from picomolar to nanomolar, and their bioavailabilities can impact primary production. Understanding the biogeochemical cycling of these hybrid-type metals with an emphasis on cobalt was the focus of ... |
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| Structural Characteristics and Swelling Mechanism of Two Commercial Nitrile-Butadiene Elastomers in Various Fluids |
06 Jan 2012 |
25 pages |
| Authors:
M S Seehra; M Yalamanchi; V Singh; WEST VIRGINIA UNIV MORGANTOWN DEPT OF PHYSICS
|
| Results on the structural characteristics and swelling mechanisms of the two commercial elastomers viz. N0674-70 and peroxide cured N0741-75 in a variety of fluids are reported here. The fluids used in these investigations included toluene, o-xylene, p-xylene, mesitylene, HISOL-15, n-hexane, ethanol, tert-butyl alcohol, acetone, JP-8, S-8 and blends of S-8 plus HISOL-15 and S-8 plus toluene. Both changes in mass and volume of the rectangular disks of the samples were ... |
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| Leading Edge. Volume 7, Issue Number 4, 2012 |
Jan 2012 |
103 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA
|
| The Leading Edge magazine is produced by the Naval Surface Warfare Center, Dahlgren, Virginia. The purpose of the publication is to showcase technical excellence across the Warfare Centers and promote a broader awareness of the breadth and depth of knowledge and support available to the Navy and DoD. In this issue of The Leading Edge magazine, you will trace the rich history of directed-energy work at Dahlgren, gain insight into ... |
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| CrossTalk: The Journal of Defense Software Engineering. Volume 24, Number 6. November/December 2011 |
Nov 2011 |
41 pages |
| Authors:
Brandon Ellis; Colin Kelly; 517 SOFTWARE MAINTENANCE SQUADRON HILL AFB UT
|
| CrossTalk, The Journal of Defense Software Engineering is co-sponsored by the Under Secretary of Defense for Acquisition, Technology and Logistics (OUSD(AT&L)); U.S. Navy (USN); U.S. Air Force (USAF); and the U.S. Department of Homeland Defense (DHS). USD(AT&L) co-sponsor: Deputy Assistant Secretary of Defense for Systems Engineering. USN co-sponsor: Naval Air Systems Command. USAF co-sponsor: Ogden-ALC 309 SMXG. DHS co-sponsor: National Cyber Security Division in the National Protection and Program Directorate. ... |
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| SMC Systems Engineering: Specialty Engineering Disciplines Framework and Descriptions. Volume 2 |
03 Oct 2011 |
|
| Authors:
AIR FORCE SPACE AND MISSILE SYSTEMS CENTER LOS ANGELES AFB CA
|
| The SED framework includes the essential activities, tasks, and products that shape the body of knowledge for each SED. A SED framework is essential for each engineering discipline to effectively scope, plan, staff, and execute engineering activities and to ensure that each discipline's contribution is timely, adequate, consistent, and compliant to support development, deployment, and sustainment of the SMC space portfolio of programs and systems. |
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| Mining and Querying Multimedia Data |
29 Sep 2011 |
144 pages |
| Authors:
Fan Guo; CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE
|
| The emerging popularity of multimedia data, as digital representation of text image, video and countless other milieus, with prodigious volumes and wild diversity exhibits the phenomenal impact of modern technologies in reforming the way information is accessed, disseminated, digested and retained. This has iteratively ignited the data-driven perspective of research and development, to characterize perspicuous patterns, crystallize informative insights, and realize elevated experience for end-users, where innovations in a spectrum ... |
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| Shadowcopy: A Python-Based Shadow Volume Enumeration and Digest Tool |
12 Sep 2011 |
23 pages |
| Authors:
Mike Horn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE
|
| This report presents shadowcopy, tool written in Python that extracts and deduplicates files from Microsoft NTFS Shadow copies using the Microsoft Volume Shadow Service (VSS), copies the files to an external volume, and prepares a report of each extracted file's name, timestamp, original path, and MD5 hash value |
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| CrossTalk. The Journal of Defense Software Engineering. Volume 24, Number 5, Sep/Oct 2011 |
Sep 2011 |
41 pages |
| Authors:
Justin T Hill; Brent Baxter; Brandon Ellis; Colin Kelly; DEPARTMENT OF DEFENSE WASHINGTON DC MILITARY HEALTH SYSTEM
|
| Part of our role at DHS is to better enable all stakeholders to secure their part of cyberspace. Given that our adversaries will exploit even the smallest weakness, identifying and mitigating exploitable weaknesses before they become a pathway for attack is vital to the defense against predatory practices. One weak link in the chain can compromise an entire software application and degrade our enterprise capabilities. Organizations must understand their information ... |
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| Engineer: The Professional Bulletin of Army Engineers. Volume 41, May-August 2011 |
Aug 2011 |
64 pages |
| Authors:
ARMY ENGINEER SCHOOL FORT LEONARD WOOD MO
|
| Engineer is published three times a year by U.S. Army Engineer School, in Fort Leonard Wood, MO. Articles in this issue include: Innovation and People: the Chief of Engineers Describes the Regiment's Strengths, ENFORCE 2011 Discussions Groups, Combatant Command Engineer Professional Development Seminar, 2011 Best Sapper Competition, The Development of Army Engineer Officer Construction Skills: Where Do You Say the Gaps Are? , The Strategy of Mapping, The Strategy of ... |
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| Science and Technology Issues Relating to Data Quality in C2 Systems |
JUN 2011 |
|
| Authors:
Jonathan Agre; M. S. Vassiliou; Corinne Kramer; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
 | A Command and Control (C2) system depends crucially on having high-quality underlying data. There is still no "best" set of data quality dimensions and metrics for C2. We consider various sources of data quality criteria, such as the 16 data quality dimensions identified by the Total Data Quality Management (TDQM) research community, and the dimensions identified by the ISO 8000 and 25012 standards. We map these dimensions against the criteria ... |
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| Comparing the Capabilities and Performance of the Ultra High Frequency Follow-On System With the Mobile User Objective System |
JUN 2011 |
71 pages |
| Authors:
Christopher K. Matassa; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The Mobile User Objective System (MUOS) is the DoD's next generation military Ultra High Frequency (UHF) Satellite Communication (SATCOM) system being designed to augment and eventually replace the currently oversubscribed UHF Follow-On (UFO) System. MUOS adapts a commercial third generation (3G) Wideband Code Division Multiple Access (WCDMA) cellular phone network architecture and combines it with geosynchronous satellites (in place of cell towers) with the goal of providing a more capable ... |
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| Enzymatic Fuel Cells: Integrating Flow-Through Anode and Air-Breathing Cathode into a Membrane-Less Biofuel Cell Design (Postprint) |
Jun 2011 |
8 pages |
| Authors:
Rosalba A Rincon; Carolin Lau; Kristen E Garcia; Emily Adkins; Heather R Luckarift; Glenn R Johnson; NEW MEXICO UNIV ALBUQUERQUE DEPT OF CHEMICAL AND NUCLEAR ENGINEERING
|
| One of the key goals of enzymatic biofuel cells research has been the development of a fully enzymatic biofuel cell that operates under a continuous flow-through regime. Here, we present our work on achieving this task. Two NAD+-dependent dehydrogenase enzymes; malate dehydrogenase (MDH) and alcohol dehydrogenase (ADH) were independently coupled with poly-methylene green (poly-MG) catalyst for biofuel cell anode fabrication. A fungal laccase that catalyzes oxygen reduction via direct electron ... |
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| Connection Between Dynamics and Thermodynamics of Liquids on the Melting Line |
21 Mar 2011 |
9 pages |
| Authors:
D Fragiadakis; C M Roland; NAVAL RESEARCH LAB WASHINGTON DC CHEMISTRY DIV
|
| The dynamics of a large number of liquids and polymers exhibit scaling properties characteristic of a simple repulsive inverse power-law potential, most notably the superpositioning of relaxation data as a function of the variable TV gamma , where T is temperature, V the specific volume, and gamma a material constant. A related scaling law Tm Vm Gamma , with the same exponent Gamma = gamma, links the melting temperature Tm ... |
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| Volumetric Collection Efficiency and Droplet Sizing Accuracy of Rotary Impactors |
FEB 2011 |
8 pages |
| Authors:
Bradley K. Fritz; W. C. Hoffmann; Jane A. Bonds; Muhammad Farooq; SOUTHERN PLAINS AGRICULTURAL RESEARCH CENTER COLLEGE STATION TX AREAWIDE PEST MANAGEMENT RESEARCH UNIT
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| Measurements of spray volume and droplet size are critical to evaluating the movement and transport of applied sprays associated with both crop production and protection practices and vector control applications for public health. Any sampling device used for this purpose will have an efficiency of collection that is a function of the sampling device itself, the droplet size of the spray being sampled, and the airspeeds under which the sampling ... |
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| Dynamic Heterogeneity and Density Scaling In 1,4-Polyisoprene |
Jan 2011 |
8 pages |
| Authors:
D Fragiadakis; R Casalini; R B Bogoslovov; C G Robertson; C M Roland; NAVAL RESEARCH LAB WASHINGTON DC
|
| Dielectric relaxation times were measured for 1,4-polyisoprenes (PI) of different molecular weight. From the data, the number of dynamically correlated segments, Nc, was calculated using an approximation to the dynamic susceptibility. Nc increases with approach to the glass transition in the usual fashion and also increases with increasing molecular weight of the PI. The latter effect is ascribed to the loss of the configurational mobility conferred by the chain ends. ... |
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| Particle-laden Thin Film Flow: An Alternating Direction Implicit Scheme and Comparison between Theory, Numerical Simulations, and Experiments |
Jan 2011 |
122 pages |
| Authors:
Matthew R Mata; CALIFORNIA UNIV LOS ANGELES DEPT OF MATHEMATICS
|
| Gravity-driven thin film flows have been analyzed in terms of fourth-order lubrication models, similarity solutions, traveling wave solutions, numerical simulations and experiments. However, in the case where particle are suspended within the fluid, studies have been largely limited to lubrication models, one-dimensional numerical simulations, and experiments. We present a numerical scheme for a lubrication model derived for particle-laden thin film flow in two dimensions with surface tension. The scheme relies ... |
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| A Radiative Transfer Model for Acoustic Propagation in Ocean Sediment Layers |
30 SEP 2010 |
11 pages |
| Authors:
Lisa M. Zurk; PORTLAND STATE UNIV OR
|
| The propagation of mid-frequency (1-10 kHz) acoustic waves in shallow water regions (depths of 100- 200 m) is strongly influenced by the characteristics of the ocean bottom. While there has been much progress in developing and validating bottom scattering models, much of the focus has been in the high frequency regime with comparatively less focus in the mid-frequency. This is an important topic, since in the mid-frequency regime the acoustic ... |
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| Natural Gas Propulsion Options for Short Sea Shipping Routes |
Aug 2010 |
49 pages |
| Authors:
Matthew Kramer; Ashley McClelland; Daniel Nowakowski; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV WEST BETHESDA MD
|
| With strict emission rules and regulations coming into place, natural gas presents itself as a favorable option in helping to reduce the amount of harmful emissions compared to diesel fuel. A team has been assigned to asses the performance, weight, safety, and volume implications of a range of various natural gas systems for a vessel designed for short sea shipping, which is an interest of the American Marine Highways Program. ... |
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| Unmanned Evaluation of Select Commercially Available Open Circuit Scuba Regulators for Cold Water Diving |
Apr 2010 |
32 pages |
| Authors:
Vince Ferris; NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL
|
| This report summarizes the results for five preselected commercially available open circuit scuba regulator models that were tested to determine their suitability for U. S. Navy diving. Five units of each model regulator were tested in both cold (38 deg F) and freezing (29 deg F) water. To emulate the ventilation of a diver, a breathing simulator with a sinusoidal breathing pattern was used, and the exhaled gas was heated ... |
|
| Naval Law Review. Volume 60, 2010 |
Jan 2010 |
236 pages |
| Authors:
NAVAL JUSTICE SCHOOL NEWPORT RI
|
| Partial contents: CONTROLLING THE USE OF FORCE IN CYBERSPACE: THE APPLICATION OF THE LAW OF ARMED CONFLICT DURING A TIME OF FUNDAMENTAL CHANGE IN THE NATURE OF WARFARE, UNITED STATES ENVIRONMENTAL LAW APPLIED IN THE ARCTIC OCEAN: FRUSTRATING THE BALANCE OF THE LAW OF THE SEA, NATIONAL SOVEREIGNTY, AND INTERNATIONAL COLLABORATION EFFORTS, THE SHIPBOARD PANDORA S BOX: THE OPERATIONAL REALITY THAT AN EXPECTATION OF PRIVACY EXISTS IN ELECTRONIC COMMUNICATIONS ABOARD ... |
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| Prallethrin-Induced Excitation Increases Contact Between Sprayed Ultralow Volume Droplets and Flying Mosquitoes (Diptera: Culicidae) in a Wind Tunnel |
2010 |
9 pages |
| Authors:
Miriam F. Cooperband; Frances V. Golden; Gary G. Clark; William Jany; Sandra A. Allan; AGRICULTURAL RESEARCH SERVICE GAINESVILLE FL CENTER FOR MEDICAL AGRICULTURAL AND VETERINARY ENTOMOLOGY
|
| Female Culex quinquefasciatus Say (Diptera: Culicidae) mosquitoes were exposed to sublethal amounts of prallethrin, sumithrin, and piperonyl butoxide applied as ultralow volume (ULV) droplets in a wind tunnel. Mosquitoes were video recorded before, during, and after treatment, and the number and size of droplets on their bodies were later determined using a compound microscope. A positive correlation was found between mosquitoes that spent more time flying during the time of ... |
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| Multi-Scale Modeling for Combined Shock-Shear Initiation of Energetic Solids |
07-Oct-2009 |
25 pages |
| Authors:
Keith A Gonthier; LOUISIANA STATE UNIV BATON ROUGE DEPT OF MECHANICAL ENGINEERING
|
| Multi-scale interactions between initially planar deformation waves in heterogeneous energetic solids and macro-scale boundaries were computationally examined to characterize wave interaction structures and dissipative heating responsible for combustion initiation. The macro-scale response was described by a continuum theory that accounts for elastic and inelastic volumetric deformation in a thermodynamically consistent manner. The meso-scale response was described by conservation principles and an elastic-viscoplastic constitutive theory to predict contact induced nonlinear deformation ... |
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| Wave Overtopping of a Barrier Beach |
Sep-2009 |
60 pages |
| Authors:
Natalie A Laudier; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| An ephemeral river is a seasonal river that flows into the ocean, forming an inlet at certain times of the year, and the river is blocked by a barrier beach that usually forms a lagoon during the rest of the year. Ephemeral rivers are important for both military and civilian communities because these areas are susceptible to rapid, unpredictable flooding and beach breaching. Wave overtopping of barrier beaches is the ... |
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| The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
Jul-2009 |
214 pages |
| Authors:
John McQuillen; Travis E Michalak; Kirk L Yerkes; Scott K Thomas; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIRECTORATE
|
| This thesis discusses the effects of a variable-gravity environment on the performance of a subcooled partially-confined spray. An experiment, consisting of a test chamber, the associated flow loops, and instrumentation, was fabricated and flown on the NASA Reduced-Gravity Testing Platform. This modified KC-135 aircraft followed a parabolic flight path to provide various acceleration levels. The spray chamber contained two opposing nozzles spraying onto Thick Film Resistor (TFR) heaters, which were ... |
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| Energy Change Detection to Assist in Tactical Intelligence Production |
Jun-2009 |
97 pages |
| Authors:
Derek A Filipe; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Currently, signals intelligence (SIGINT) analysts are constantly overwhelmed by the amount of data they ingest. A relatively new technology, known as Energy Change Detection (ECD), was fashioned in order to alleviate a portion of the background noise, or signals of non-interest to the SIGINT analyst. ECD has been tested and its operational capability verified and validated by senior analysts. With the current organizational structure within which ECD resides, its utility ... |
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| Spectral-Based Volume Sensor Prototype, Post-VS4 Test Series Algorithm Development |
30-Apr-2009 |
45 pages |
| Authors:
Daniel A Steinhurst; Jeffrey C Owrutsky; NAVAL RESEARCH LAB WASHINGTON DC
|
| A retrospective analysis was undertaken to better understand the performance trade-offs involved in reducing the sensor count in the Spectral Based Volume Sensor Component Prototype developed as part of the Advanced Volume Sensor Project. Using a portion of the Volume Sensor Test Series 4 (VS4) data, superior performance was retrospectively demonstrated for several potential new configurations than was originally observed during the live VS4 demonstration. Additionally, it was possible to ... |
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| A Continuum Description of Nonlinear Elasticity, Slip and Twinning, With Application to Sapphire |
Mar-2009 |
38 pages |
| Authors:
J D Clayton; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| A model is developed for elasticity, plasticity and twinning in anisotropic single crystals subjected to large deformations. Dislocation glide and deformation twinning are dissipative, while energy storage mechanisms associated with dislocation lines and twin boundaries are described via scalar internal state variables. Concepts from continuum crystal plasticity are invoked, with shearing rates on discrete glide and twinning systems modelled explicitly. The model describes aspects of thermomechanical behaviour of single crystals ... |
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| Microstructure-Sensitive Extreme Value Probabilities for High Cycle Fatigue of Ni-Base Superalloy IN100 (Preprint) |
Mar-2009 |
48 pages |
| Authors:
Craig P Przybyla; David L McDowell; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| To quantify the effects of interactions between various microstructure attributes on fatigue life in the high cycle fatigue (HCF) regime, we have proposed a new microstructure-sensitive extreme value statistical framework. This framework couples the extreme value distributions of certain fatigue indicator parameters (FIPs) or response functions to the correlated microstructure attributes that exist at the extreme value locations of these FIPs. We demonstrate the application of this statistical framework to ... |
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| U.S. Trade Deficit and the Impact of Rising Oil Prices |
12-Sep-2008 |
|
| Authors:
James K Jackson; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
|
| Petroleum prices have continued to rise sharply in 2008, at one time reaching more than $140 per barrel of crude oil. At the same time the average monthly volume of imports of energy-related petroleum products has fallen slightly. The combination of sharply rising prices and a slightly lower level of imports of energy-related petroleum products translates into an escalating cost for those imports. This rising cost added an estimated $50 ... |
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| Development of a Long-Range Gliding Underwater Vehicle Utilizing Java Sun SPOT Technology |
01-Sep-2008 |
117 pages |
| Authors:
Ronald J Hemmelgarn; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The future of U.S. Naval Operations can be described by a simple system of requirements and constraints. Increasing the diversity and scope of mission requirements, while being constrained by decreasing budget resources, requires some forms of equalization to maintain a constant rate of successful mission fulfillment. The solution to this system can be found in unmanned vehicle development. The most recent revision of the Navy Unmanned Undersea Vehicle (UUV) Master ... |
|
| Pylon Effects on a Scramjet Cavity Flameholder Flowfield |
01-Sep-2008 |
204 pages |
| Authors:
Andrew B Freeborn; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Cavity flameholders in supersonic combustion ramjet (scramjet) combustors, while effective, fail to take advantage of the full combustor volume. Adding a pylon to the leading edge of a cavity flameholder generates a flowfield increasing mass exchange between the cavity and main combustor flow, increasing the mixing interface between flameholder products and main combustor flow, and exhibiting minimal Reynolds number effects. To demonstrate this modified flowfield driven by supersonic expansion behind ... |
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| Electroluminescence Efficiency Enhancement using Metal Nanoparticles |
22-Jun-2008 |
4 pages |
| Authors:
Richard A Soref; J B Khurgin; G Sun; AIR FORCE RESEARCH LAB HANSCOM AFB MA SENSORS DIRECTORATE
|
| We apply the "effective mode volume" theory to evaluate enhancement of the electroluminescence efficiency of semiconductor emitters placed in the vicinity of isolated metal nanoparticles and their arrays. Using the example of an InGaN/GaN quantum-well active region positioned in close proximity to Ag nanospheres, we show that while the enhancement due to isolated metal nanoparticles is large, only modest enhancement can be obtained with ordered array of those particles. We ... |
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| Multiscale Modeling and Computation of Liquid Crystal Polymers, Polymer Blends, and Polymer Nanocomposites: Investigation of Rheology and Material Properties |
15 APR 2008 |
11 pages |
| Authors:
Qi Wang; FLORIDA STATE UNIV TALLAHASSEE DEPT OF MATHEMATICS
|
| High-performance polymeric materials such as liquid crystal polymers and polymer nano-particle composites have many military applications. The project aimed to study the mesoscopic structure formation during flow processing and characterization of material properties in solid states. Significant progress has been made to model the materials and to understand their rheological properties in melt or solution processing. Electrical and thermal conduction properties of the nanocomposites are characterized by the low volume ... |
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| Photonic Reagents: The Production of Cyclic Ozone, With a Focus on Developing Equation Free Methods for Optimization Schemes |
31 MAR 2008 |
19 pages |
| Authors:
Robert J. Levis; Dmitri A. Romanov; Hersch A. Rabitz; Yannis G. Kevrekidis; Ronald Coifman; TEMPLE UNIV PHILADELPHIA PA
|
| An apparatus capable of producing and detecting neutral ozone species created from high pressure oxygen using strong field photonic reagents have been designed constructed and utilized. The apparatus uses femtosecond BoxCARS to probe small volumes with multiple laser beams. Using this technique strong evidence was obtained that photonic reagents convert O2 to conventional ozone. Progress has also been made on the understanding and control of filament formation in ambient conditions. ... |
|
| Characterization of Corrosion on Outdoor-Exposed Aluminum Metal-Matrix Composites as a Function of Reinforcement Specie and Volume Fraction |
FEB 2008 |
52 pages |
| Authors:
Ralph P. Adler; Daniel J. Snoha; George Hawthorn; Lloyd H. Hihara; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| The Hawaii Corrosion Laboratory and the U.S. Army Research Laboratory collaborated to prepare, environmentally expose for up to 2 years, and evaluate multivariant sets of metal matrix composites (MMCs). The experimental matrix involved variations in particulate volume-percent and particulate reinforcement specie (higher purity green and less-pure black silicon carbide, boron carbide, and alumina). The specific objective of this study was to determine, mainly using x-ray powder diffractometry, how observed gravimetric ... |
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| Multiple Branches of Ordered States of Polymer Ensembles With the Onsager Excluded Volume Potential |
01-Jan-2008 |
7 pages |
| Authors:
Hongyun Wang; Hong Zhou; CALIFORNIA UNIV SANTA CRUZ DEPT OF APPLIED MATHEMATICS AND STATISTICS
|
| We study the branches of equilibrium states of rigid polymer rods with the Onsager excluded volume potential in two-dimensional space. Since the probability density and the potential are related by the Boltzmann relation at equilibrium, we represent an equilibrium state using the Fourier coefficients of the Onsager potential. We derive a non-linear system for the Fourier coefficients of the equilibrium state. We describe a procedure for solving the non-linear system. ... |
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| Collection Efficiencies of Various Airborne Spray Flux Samplers Used in Aerial Application Research |
Jan-2008 |
11 pages |
| Authors:
W C Hoffmann; Bradley K Fritz; AGRICULTURAL RESEARCH SERVICE GAINESVILLE FL CENTER FOR MEDICAL AGRICULTURAL AND VETERINARY ENTOMOLOGY
|
| A low air speed, spray dispersion tunnel was constructed and used to evaluate the collection efficiency of passive spray flux collectors. The dispersion tunnel utilizes an air-assisted nozzle to generate a spray cloud with a D(V0.5) of 18.5 (+/- 0.4 microns) at air speeds ranging from 0.4?4.0 m/s. A sampling protocol was developed to minimize spray flux and air speed variation effects while providing a check on theoretical collection efficiency ... |
|
| Synthesis of Si Nanowires for an Anode Material of Li Batteries |
04 DEC 2007 |
31 pages |
| Authors:
KUN-HONG LEE; POHANG UNIV OF SCIENCE AND TECHNOLOGY (SOUTH KOREA)
|
| The work encompassed the study of new alloy anode material for the next generation of Li ion battery. The alloy includes Li alloy with Sn, Al and Si. It has been reported that the Li4.4Si alloy can have the theoretical capacity of 4200 mAhr/g, which is much higher than the capacity of the graphite. However, in spite of the theoretical prediction, the immense volume increase, thus capacitance decrease occurred during ... |
|
| Computer Simulation of Mechanical and Physical Properties of Carbon Foam Materials |
Dec-2007 |
5 pages |
| Authors:
Serguei Kanaoun; INSTITUTO TECNOLOGICO Y DE ESTUDIOS SUPERIORES DE MONTERREY (MEXICO)
|
| The project is devoted to the problem of the numerical simulation of the effective elastic, thermo and electro conductive properties of open-cell foam materials. The Laguerre tessellation procedure is applied for the construction of skeletons of random foam microstructures with prescribed distributions of the cell diameters. A four-parametric approximation of the ligament shapes in the open-cell foams is proposed. For simulation of the elastic properties of open -cell foams, a ... |
|
| Preliminary Analysis of Particulate Infiltration into Space System Volumes |
30 SEP 2007 |
24 pages |
| Authors:
De-Ling Liu; Kenneth T. Luey; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
|
| To understand the dynamics of airborne particulate intrusion into a simulated space telescope and other space system volumes, a simple model was developed to predict the extent to which ambient particles penetrate through vent holes and enter the volume interiors after the purge is off. This report describes the mathematical modeling analysis, experimental data from laboratory studies, and field measurements from launch processing. It was found that the characteristic time ... |
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| Measurement of Time Varying Volume Scatter |
30 Sep 2007 |
5 pages |
| Authors:
Jules S Jaffe; CALIFORNIA UNIV REGENTS LA JOLLA CA SCRIPPS INST OF OCEANOGRAPHY
|
| The major long-term scientific goal of this program is to understand the small-scale optical properties of the ocean. This includes the spatial and temporal inhomogeneities that occur naturally over scales from km to mm. The importance of this area of inquiry is underscored by both environmental and practical concerns. In an environmental context, the radiative transfer of light in the ocean is dependent on not only the average but also ... |
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| Laboratory Verification of the Optical Turbulence Sensor (OTS): Particulate Volume Scattering Function and Turbulence Properties of the Flow |
30 Sep 2007 |
6 pages |
| Authors:
Darek J Bogucki; MIAMI UNIV FL ROSENSTIEL SCHOOL OF MARINE AND ATMOSPHERIC SCIENCE
|
| Our goal is an extensive tank validation of the Optical Turbulence Sensor (OTS). This sensor uses a Hartman optical wavefront sensor to determine turbulence characteristics and to characterize the particulate field. The OTS has recently undergone successful field testing. The ocean trials indicate that the OTS surpasses in many ways current microstructure based instruments to quantify turbulence. Furthermore, it is able to measure particles. |
|
| Hearing Protection for High-Noise Environments. Part 1 |
31 MAY 2007 |
60 pages |
| Authors:
Elizabeth Bleszynski; Marek Bleszynski; Thomas Jaroszewicz; MONOPOLE RESEARCH THOUSAND OAKS CA
|
| Report developed under STTR contract for topic AFO6-T035. The objective of our effort was to develop powerful soffware tools and to perform high fidelity simulation which would allow identification and understanding of relevant bioacoustic and psychoacoustic mechanisms responsible for the transmission of acoustic energy through non-airborne pathways to the cochlea. As the main achievements of our Phase I work we consider: - development of a set of algorithms (including non-lossy, ... |
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| High-Speed Digital-Image Data Acquisition, Processing, and Visualization System for Turbulent Mixing and Combustion |
25 MAY 2007 |
13 pages |
| Authors:
Paul E. Dimotakis; CALIFORNIA INST OF TECH PASADENA DEPT OF AERONAUTICS
|
| This report summarizes an equipment and instrumentation system for high-speed digital image data acquisition and processing. The research program targets the physics of turbulence, mixing, and combustion, focusing on high-speed environments. The system includes components for Planar Laser Induced Fluorescence (PLIF), flame-speed, and ignition and extinction measurements of laminar flames at variable pressure; tracking flow structures in a high-speed mixing layer using high-speed color schlieren; laser-beam manipulation and volume scanning ... |
|
| Enhanced Ultrasound Visualization of Brachytherapy Seeds by a Novel Magnetically Induced Motion Imaging Method |
01 APR 2007 |
15 pages |
| Authors:
Stephen McAleavey; ROCHESTER UNIV NY
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| We report our progress in developing Magnetically Induced Motion Imaging (MIMI) for unambiguous identification and localization brachytherapy seeds in ultrasound images. In this period we have used finite-element models to determine a torque maximizing seed core shape to generate the greatest possible seed vibration for a given core volume. We present two new signal-processing methods. The first is a compounding method for suppression of "comet-tail" artifacts in segmented seed images. ... |
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| Deployable Air Beam Fender System (DAFS): Energy Absorption Performance Analysis |
30 MAR 2007 |
48 pages |
| Authors:
Paul V. Cavallaro; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Performance curves detailing the energy absorption parameters of selectively sized deployable air beam fender systems (DAFSs) were established to enable future efficiencies in fender design. Numerical solutions were generated using the ABAQUS/Explicit Finite Element Analysis (FEA) Program for two mooring configurations: ship-to-ship and ship-to-causeway (non-ballasted). The governing energy balance was presented and the contributions of strain energy and air compressibility were assessed for various inflation pressures and DAFS sizes. The ... |
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| Managing the Service Supply Chain in the Department of Defense: Opportunities and Challenges |
30-Dec-2006 |
76 pages |
| Authors:
Uday Apte; Geraldo Ferrer; Ira Lewis; Rene Rendon; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
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| The services acquisition volume in the US Department of Defense (DoD) has continued to increase in scope and dollars in the past decade. Between FY 1999 to FY 2003, DoD's spending on services increased by 66%, and in FY 2003, the DoD spent over $118 billion (or approximately 57% of total DoD procurement dollars) on services. In recent years, the DoD has spent more on services than on supplies, equipment ... |
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| Technology & Mechanics Overview of Air-Inflated Fabric Structures |
04 DEC 2006 |
13 pages |
| Authors:
Paul V. Cavallaro; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| Air-inflated fabric structures are categorized as pre-tensioned structures and are uniquely capable of many advantages not available with traditional structures. These include lighter weight designs, rapid and self-erecting deployments, enhanced mobility, large deployed-to- packaged volume ratios, fail-safe collapse and optional rigidification. Research and development in pursuit of air-inflated structures can be traced to space, military, commercial and marine applications. Examples include air ships, weather balloons, inflatable radomes, shelters, pneumatic muscles, ... |
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