| Viral Penetration of High Efficiency Particulate Air (HEPA) Filters (PREPRINT) |
Sep-2009 |
39 pages |
| Authors:
Joseph D Wander; Brian K Helmbuch; C Y Wu; APPLIED RESEARCH ASSOCIATES INC TYNDALL AFB FL
|
 | High Efficiency Particulate Air (HEPA) filters are the primary technology used for particulate removal in individual and collective protection applications. HEPA filters are commonly thought to be impenetrable, but in fact they are only 99.97% efficient at collecting the most-penetrating particle (approx. 0.3 micrometer). While this is an impressive collection efficiency, HEPA filters may not provide adequate protection for all threats: viruses are submicron in size and have small minimum ... |
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| Limiting Impact Force Due to Yielding and Buckling of the Plates and Internal Structural Frame at the Bow of a Barge during Its Head-on Impact with a Bullnose or Cellular Structure |
Aug-2009 |
51 pages |
| Authors:
Robert M Ebeling; Terry W Warren; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS INFORMATION TECHNOLOGY LAB
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| This report presents a research study conducted to predict the impact forces that occur when a barge train impacts head-on with a circular concrete or concrete-filled structure. These structures are found at the end of lock approach walls as semicircles called bullnoses, as circular cells, and as mooring cells. This research was conducted using finite element analysis. A detailed finite element model of the bow of a jumbo hopper barge ... |
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| Total and Differential Sputter Yields of Boron Nitride Measured by Quartz Crystal Microbalance (Preprint) |
07-May-2009 |
19 pages |
| Authors:
B Rubin; A P Yalin; J Topper; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| We present differential sputter yield measurements of boron nitride due to bombardment by xenon ions. A four-grid ion optics system is used to achieve a collimated ion beam at low energy (100 eV). A quartz crystal microbalance (QCM) is used to measure differential sputter yield profiles of condensable components from which total sputter yields can also be determined. We report total and differential sputter yields of three grades of boron ... |
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| The Use of Commercial Non-Hazardous Air Pollutant Monomers to Optimize the Properties of Fatty Acid-Based Resins |
May-2009 |
34 pages |
| Authors:
James M Sands; La; John J Scala; Priya Kamath; Anita Sahu; Giuseppe R Palmese; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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| Vinyl ester (VE) resins are used to make polymer matrix composites in military and commercial applications because of their good properties, low weight, and low cost. These resins typically contain high concentrations of reactive diluents, such as styrene, to allow these resins to be molded using resin transfer molding and other inexpensive liquid molding techniques. Because styrene is a hazardous air pollutant (HAP) and a volatile organic compound (VOC), the ... |
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| Spectroscopy and Dynamics of Transient and Energetic Species |
Apr-2009 |
14 pages |
| Authors:
Daniel M Neumark; CALIFORNIA UNIV BERKELEY DEPT OF CHEMISTRY
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| Free radicals, weakly bound van der Waals complexes, and metal and semiconductor clusters are characterized by photodetachment of the corresponding negative ions using slow electron velocity-map imaging (SEVI), a recently developed, high-resolution (2-3 cm-1) variant of negative ion photoelectron spectroscopy. The SEVI spectrum of a negative ion yields the electron affinity of the neutral, term values for excited states accessible via one-photon detachment, and accurate vibrational frequencies for the ground ... |
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| Modulation of Stem Cells Differentiation and Myostatin as an Approach to Counteract Fibrosis in Muscle Dystrophy and Regeneration After Injury |
Mar-2009 |
64 pages |
| Authors:
Nestor F Gonzalez-Cadavid; CHARLES DREW UNIV LOS ANGELES CA
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| During Year 2 we have confirmed that muscle derived stem cells (MDSC) obtained from the wild type (wt) mouse skeletal muscle have in vitro a long-term myogenic capacity, but restricted to passages 10 to about 40-45 or earlier. The in vitro yield of myotubes from wt MDSC expressing myosin heavy chain II was not modified even at the optimal myotube forming capacity at early passages, by any of the several ... |
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| Estimation of Weapon Yield From Inversion of Dose Rate Contours |
Mar-2009 |
138 pages |
| Authors:
Buckley E O'Day; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| This research studies the uncertainty in yield estimation from inversion of dose rate contours. The Hazard Prediction and Assessment Capability (HPAC) and a simple FORTRAN95 based Fallout Deposition Code (FDC) are used to recreate dose rate contours from historic nuclear tests. Fallout footprints from six atomic tests are recreated using balloon wind soundings and high resolution mesoscale weather reanalysis data. Dose rate contour plots are created for different yields for ... |
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| High-Density Renewable Fuels Based on the Selective Dimerization of Pinenes |
Jan-2009 |
8 pages |
| Authors:
Michael E Wright; Benjamin G Harvey; Roxanne L Quintana; NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
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| High-density fuel candidates have been synthesized in up to 90% yield from beta-pinene, a renewable strained bicyclic compound derived from wood and plant sources. The process is based on the heterogeneous acidic catalysts Montmorillonite-K10 and Nafion, which promote selective isomerization and dimerization of pinenes under moderate conditions (100-deg C and atmospheric pressure). Montmorillonite-K10 was shown to be a highly active catalyst for dimerization but was also active in the ring ... |
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| Internet Topology Generation Based on Reverse-Engineered Design Principles: Performance Tradeoffs Between Heuristic and Optimization-Based Approaches |
01-Jun-2008 |
91 pages |
| Authors:
Jonathan A Derosier; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The global Internet is a federation of computer networks that are owned and operated by Internet Service Providers (ISPs). Because ISPs do not share topology information for competitive and privacy reasons, researchers, operators, and policy makers who want to assess the performance and reliability of the system as a whole must infer structure from limited measurement data. We use reverse-engineering to infer underlying design principles of a national ISP and ... |
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| Measurements of Secondary Electron Yield from Materials with Application to Depressed Collectors |
04 APR 2008 |
41 pages |
| Authors:
Edl Schamiloglu; Mark Gilmore; NEW MEXICO UNIV ALBUQUERQUE DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| This final technical report reviews the research activities during the period of this grant, emphasizing the final year. The key finding of our study is that the total incident electron dose is a critical parameter affecting secondary electron emission (SEE). A completely automated experimental set-up was implemented that allowed for measurement of secondary electron yield (SEY) as a function of beam energy, angle of incidence of primary electrons, electron dose, ... |
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| Fundamental Investigations of Durability at a Polymer Electrolyte-Electrode Interface |
Apr-2008 |
10 pages |
| Authors:
Sanjeev Mukerjee; NORTHEASTERN UNIV BOSTON MA DEPT OF CHEMISTRY
|
| The overall objectives of this proposed effort was to further our fundamental understanding of degradation pathways at a polymer electrolyte-electrode interface. Towards this goal the key thrust areas proposed in this project were: (1) Understanding the role of peroxide lead free radical attack on the polymer electrolyte at the interface with both anode and cathode electrodes using a specially designed PEM cell enabling accelerated degradation conditions simulating practical H2/Air PEM ... |
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| Nonmechanical Multizoom Telescope Design Using A Liquid Crystal Spatial Light Modulator and Focus-Correction Algorithm |
27-Mar-2008 |
81 pages |
| Authors:
Eric W Thompson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| Theoretical development and design of a compact nonmechanical multi-zoom telescope system is presented. A liquid crystal spatial light modulator (LC SLM) enables selection of four seperate beam paths without the use of moving parts. Each path incurs a different focus aberration in the image plane that can be deconvolved with postprocessing to yield four possible corrected magnification options. To increase exibility, each region has a 40-wave subrange of focus. Optical ... |
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| Cost of Unsuitability: Assessment of Trade-offs Between the Cost of Operational Unsuitability and Research, Development, Test and Evaluation (RDT&E) Costs |
Mar-2008 |
|
| Authors:
Christopher S Wait; Waynard C Devers; Tzee-Nan K Lo; Harold S Balaban; Kristen M Guerrera; INSTITUTE FOR DEFENSE ANALYSES ALEXANDRIA VA
|
 | More than one fourth of all major weapon systems that underwent Operational Test and Evaluation from 1984-2006 were evaluated as unsuitable. A frequent and significant contributing factor in these unsuitable evaluations was substandard reliability. When a system is deemed unsuitable due to substandard reliability, it necessarily incurs additional costs to avoid, fix, or accept the consequences of its unsuitability. We estimate such costs for three aircraft systems (F-22, MV-22, and ... |
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| Microdischarges for Phased Arrays of Low Coherence Emitters, and Microchip and Microsphere Lasers |
01-Feb-2008 |
24 pages |
| Authors:
J G Eden; ILLINOIS UNIV AT URBANA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Arrays as large as 250,000 Si microcavity plasma devices have been fabricated and tested extensively. Exciting a phosphor with VUV emission from these arrays yields values of the luminous efficacy > 7 lumens/W, considerably higher than that available fro conventional plasma displays. A new microplasma technology based on nanopourous A12O3 grown on Al has been developed, and arrays with emitting areas > 20 cm2 have been demonstrated. Successfully sealed in ... |
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| Enhanced Direct-Drive Implosions with Thin High-Z Ablation Layers |
2008 |
17 pages |
| Authors:
Andrew N. Mostovych; Denis G. Colombant; Max Karasik; James P. Krauer; Andrew J. Schmitt; James L. Weaver; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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| New direct-drive spherical implosion experiments with deuterium filled plastic shells have demonstrated significant and absolute (2x) improvements in neutron yield when the shells are coated with a very thin layer (~200-400 Angstron) of high-Z material such as palladium. This improvement is interpreted as resulting from increased stability of the imploding shell. These results provide for a possible path to control laser imprint and stability in laser-fusion-energy target designs. |
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| Micro Chemical Oxygen-Iodine Laser (COIL) |
OCT 2007 |
|
| Authors:
Carol Livermore-Clifford; MASSACHUSETTS INST OF TECH CAMBRIDGE
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| It has been previously proposed to improve the performance and compactness of chemical oxygen-iodine lasers (COIL) through the replacement of some of their macroscale components with arrays of higher-performing microscale (MEMS) components. In this program, a MEMS singlet oxygen generator (SOG) to power a COIL laser was designed, microfabricated from silicon and glass wafers, and successfully demonstrated. The MEMS SOG contained an array of reaction channels for the chemical reaction ... |
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| The Hydroxyl Radical Reaction Rate Constant and Products of Cyclohexanol |
OCT 2007 |
12 pages |
| Authors:
William R. Bradley; Sheryl E. Wyatt; J. R. Wells; Michael V. Henley; Gina M. Graziano; APPLIED RESEARCH ASSOCIATES INC TYNDALL AFB FL
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| The gas phase reaction of the hydroxyl radical (OH) with cyclohexanol (COL) has been studied. The rate coefficient was determined to be (19.0 + or - 4.8) x 10 (exp -12) cu cm/molecule/s (at 297 + or - 3 K and 1 atmosphere total pressure) using the relative rate technique with pentanal, decane, and tridecane as the reference compounds. Assuming an average OH concentration of 1 x 10 exp 6) ... |
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| Extracting Stress-Strain and Compressive Yield Stress Information from Spherical Indentation |
SEP 2007 |
24 pages |
| Authors:
Thomas F. Juliano; Mark R. VanLandingham; Tusit Weerasooriya; Paul Moy; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| In recent years, instrumented indentation has become increasingly used to measure mechanical properties such as elastic modulus and fracture toughness at the micrometer scale. In this work, an experimental method is developed to estimate stressstrain behavior using indentation load-displacement and continuous stiffness measurement data. An attempt is made to subtract plastic behavior out of the loading curve to generate stress-strain data from which elastic modulus and yield stress can be ... |
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| Proteomic Analysis of Genistein Mammary Cancer Chemoprevention |
JUL 2007 |
25 pages |
| Authors:
Coral A. Lamartiniere; ALABAMA UNIV IN BIRMINGHAM
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| We have developed reproducible methodology for separation biochemical and statistical analysis and identification of mammary gland proteins. We have discovered that GTP-CHl expression is significantly increased shortly following exposure at day 21 by genistein. At day 50 there was significant up-regulation of tyrosine hydroxylase and VEGF-R2. This and previous work suggests that early postnatal (prepubertal) exposure to genistein enhances cell proliferation and cell differentiation and gland maturation. This unique developmental ... |
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| Species-Specific Sputtering Measurements with Cavity Ring-Down Spectroscopy (Preprint) |
JUL 2007 |
11 pages |
| Authors:
V. K. Surla; L. Tao; A. P. Yalin; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| We report sputtering studies using cavity ring-down spectroscopy (CRDS). The high sensitivity of the technique and its non-intrusive nature make it amenable to both in situ device studies as well as basic characterization studies. We provide demonstrative measurements of sputtered particles showing the ability to determine species-specific number density and velocity. We summarize a spatial-scanning approach for differential sputter yield measurements and give a measurement example based on a tantalum ... |
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| Differential Sputter Yields of Boron Nitride, Quartz, and Kapton Due to Low Energy Xe+ Bombardment (Preprint) |
JUL 2007 |
16 pages |
| Authors:
A. P. Yalin; B. Rubin; S. R. Domingue; Z. Glueckert; J. D. Williams; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| In this contribution we present results of differential sputter yield measurements of boron nitride, quartz, and kapton due to bombardment by xenon ions. The measurements are made using a sputtering diagnostic based on a quartz crystal microbalance (QCM). The QCM measurement allows full angular resolution, i.e. differential sputtering yield measurements are measured as a function of both polar angle and azimuthal angle. Measured profiles are presented for 100, 250, 350 ... |
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| Development of Algorithms for Nonlinear Physics on Type-II Quantum Computers |
JUL 2007 |
12 pages |
| Authors:
George Vahala; COLLEGE OF WILLIAM AND MARY WILLIAMSBURG VA
|
| Using CAP resources we have been able to uncover lattice geometry effects in the entropic lattice Boltzmann algorithm that had not been expected from lower grid resolution runs. In the entropic formulation, one is working with a generalized BGK collision operator that has within it the germs of detailed balance. Thus, the unconditionally stable algorithm is achieved with a variable transport coefficient, not unlike Large Eddy Simulations (LES) in CFD. ... |
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| Optimal Inventory Policy for Two-echelon Remanufacturing |
30-Apr-2007 |
29 pages |
| Authors:
Geraldo Ferrer; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
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| This paper presents a two-echelon remanufacturing facility subject to constant demand in which the disassembly process and the repair process observe stochastic yield. The author develops an intuitive scheduling policy and performs a robustness test. Yano and Lee (1995) revised several lot-sizing models in which production yield was random. Many of those models were inspired by the difficulties faced in the production of electronic components, where the production yield in ... |
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| Development of a Flow-Through SQUID System for Non-Destructive Evaluation of MRI Wire |
23 MAR 2007 |
3 pages |
| Authors:
Frederick C. Wellstood; MARYLAND UNIV COLLEGE PARK DEPT OF PHYSICS
|
| This project developed techniques to detect small defects in NbTi magnet wire at room-temperature using a flow-through high-transition temperature (Tc) superconducting quantum interference device (SQUID) system. The ability to detect small defects in km-long sections of NbTi magnet wire could improve the production yield of high-field magnets for power and medical applications. Such magnets are wound from continuous sections of wire up to 1 km long, and a single small ... |
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| Direct-Drive Laser Target Designs for Sub-MegaJoule Energies |
01-Jan-2007 |
11 pages |
| Authors:
A L Velikovich; J H Gardner; A J Schmitt; D G Colombant; S T Zalesak; D E Fyfe; S P Obenachain; J W Bates; W Manheimer; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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| New direct-drive laser target designs with KrF laser light take advantage of the shorter wavelength to lower the laser energy required for substantial gain (>30x) to sub-MJ level. These low laser-energy pellets are useful in systems that could form an intermediate step towards fusion energy, such as the proposed Fusion Test Facility [S. P. Obenschain,et al, Phys. Plasmas 13, 056320 (2006)]. The short wavelength laser should allow higher intensity (and ... |
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| Ballistic Missile Trajectory Estimation |
DEC 2006 |
77 pages |
| Authors:
Joseph Dituri; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Angles measurements from optical systems are the primary source of data for maintaining the orbits of high altitude satellites. Radar measurements are used primarily for low Earth orbit (LEO) satellites. Recently it has been shown that the accuracy of the orbit updates using only optical system angles-only data is just as good, if not better, than the performance from radar systems for LEO satellites. The purpose of this thesis is ... |
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| Water and Sediment Data for Chemical Indicators of Contamination |
DEC 2006 |
25 pages |
| Authors:
Tyler Bowley; Steven Larson; Anthony Bednar; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| INTRODUCTION: This subtask of the Interagency Performance Evaluation Team (IPET) Task 9 project focuses on data mining and compilation for chemical results in four Louisiana parishes affected by flooding from Hurricanes Katrina and Rita Orleans, Plaquemines, St. Bernard, and St. Charles. The compounds of interest are arsenic, lead, benzo[a]pyrene (BaP) and 1,1-dichloro-2,2- bis(p-chlorophenyl)ethylene (DDE), selected by consensus as likely candidates because of availability of data following the flooding events (Hurricanes ... |
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| The Estimation of Properties Employed to Predict the Environmental Fate and Transport of Hydrazine-Alternative Hypergols |
01 NOV 2006 |
9 pages |
| Authors:
M. J. McQuaid; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| Under a program to design and develop hydrazine-alternative hypergols, assessments of the risks candidates pose to human health and the environment are to be made and considered along with traditional engine performance criteria throughout the selection and development process. Seeking to base assessments for the earliest stages of the process on quantitative structure property relationships (QSPRs), published QSPRs for 6 physical properties commonly employed as input for fate, transport and ... |
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| Distributed Mechanical Actuators for Design of a Closed-Loop Flow-Control System (Postprint) |
OCT 2006 |
19 pages |
| Authors:
Mehul P. Patel; Richard M. Kolacinski; S. K. Patil; T. T. Ng; ORBITAL RESEARCH INC CLEVELAND OH
|
| This report was developed under a SBIR contract. Active flow control experiments were conducted on a two-dimensional, single-element NACA 4312 airfoil to assess the performance of vortex generators and gurney flaps as lift-enhancing devices for the control of longitudinal dynamics of an air vehicle. The vortex-generators are shown to delay boundary layer separation and provide an increase in the lift coefficient for angles of attack above 12 deg, and the ... |
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| Application of the SAM Computer Program for Truckee River Stable Channel Analysis |
SEP 2006 |
15 pages |
| Authors:
Stephen H. Scott; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| The purpose of this Coastal and Hydraulics Engineering Technical Note (CHETN) is to demonstrate the utility of the SAM computer programs for evaluating the stability of a stream restoration design on the Truckee River. SAM is an integrated system of computer programs developed under the Flood Damage Reduction and Stream Restoration Research Program sponsored by the U.S. Army Corps of Engineers (USACE 2000). These programs are designed to satisfy the ... |
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| Learning with Data Adaptive Features |
27 JUL 2006 |
37 pages |
| Authors:
Yongdai Kim; SEOUL NATIONAL UNIV SEOUL (KOREA SOUTH) STATISTICAL RESEARCH CENTER FOR COMPLEX SYSTEMS
|
| It is frequently observed that the dimension of inputs is much larger than the sample size. Examples are image construction, microarray data, data mining etc. In such cases, standard learning methods either are not applicable or perform badly. Also, identifying a small subset of important features, which discriminate outputs, becomes an important subject. Hence, good learning algorithms with high dimensional inputs should provides a classification rule which not only yields ... |
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| Compile-Time Schedulability Analysis of Communicating Concurrent Programs |
28 JUN 2006 |
112 pages |
| Authors:
Cong Liu; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
|
| The use of concurrent models has become a necessity in embedded system design. This trend is driven by the growing complexity and inherent multitasking of embedded systems. Describing a system as a set of concurrently executed, relatively simple subtasks is more natural than using a single, complicated task. Embedded systems, however, have limited resources. They often have a few processors. This implies that several software subtasks "programs" have to share ... |
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| Platinum Acetylide Materials for Optical Limiting |
10 MAY 2006 |
13 pages |
| Authors:
Kirk S. Schanze; FLORIDA UNIV GAINESVILLE
|
| This project explored linear and non-linear optical structure-property relationships for Pt-acetylide oligomers and polymers. These materials show promise for application in laser protection via the reverse saturable absorption (RSA) mechanism. This basic science program had the following primary objectives: 1) Chemical synthesis and purification of new pi-conjugated Pt-acetylide oligomers and polymers. 2) Characterization of the ground and excited state properties of the new materials, with emphasis placed on measurement of ... |
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| Synthesis of Diketopiperizine Peptide Derivatives by Cross-Metathesis |
MAY 2006 |
35 pages |
| Authors:
Tammy K. Low; Daniel Cooper; Ion Ghiviriga; Eric Enholm; FLORIDA UNIV GAINESVILLE DEPT OF CHEMISTRY
|
| The olefin CM reactivity and selectivity of amino acid derivatives with a cyclic scaffold to generate diketopiperizine peptide derivatives were investigated. Product yields were dependent on the amino acid R groups, and whether the amino acid possessed an allyl or homoallyl moiety at the caroxylate side. The stereoselectivity of the dipeptide derivatives was found to be predominantly trans. |
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| Z-Pinch Plasma Neutron Sources |
24 MAR 2006 |
54 pages |
| Authors:
A. L. Velikovich; R. W. Clark; J. Davis; Y. K. Chono; C. Deeney; C. A. Coverdale; C. Ruiz; G. Cooper; J. Franklin; L. I. Rudakov; SANDIA NATIONAL LABS ALBUQUERQUE NM
|
| A deuterium gas-puff load imploded by a multi-MA current driver, from a large initial diameter could be a powerful source of fusion neutrons, a plasma neutron source. Unlike the beam-target neutrons produced in Z-pinch plasmas in the 1950s and deuterium-fiber experiments in the 1980s, the neutrons generated in deuterium gas-puffs, with current levels achieved in recent experiments on the SNL Z facility, could contain a substantial fraction of thermonuclear origin. ... |
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| Chemical Modification of Fluorinated Polyimides: New Thermally Curing Hybrid-Polymers With POSS (PREPRINT) |
15 MAR 2006 |
33 pages |
| Authors:
Michael E. Wright; Brian J. Petteys; Andrew J. Guenthner; Stephen Fallis; Gregory R. Yandek; Sandra J. Tomczak; Timothy K. Minton; Amy Brunsvold; AIR FORCE RESEARCH LAB EDWARDS AFB CA
|
| A series of four new end-capped and hydroxymethyl-functionalized polyimides were prepared. Through a two-step chemical modification process 3- aminopropylisobutyl-POSS was covalently attached to the polymer backbone. POSS loading levels as high as 40 wt-% could be obtained while maintaining excellent processability and optical clarity of thin films. Concurrent attachment of either a cyanate ester or hydroxyethyl methacrylate (HEMA) group afforded processable POSS-polyimides that underwent thermal curing to yield solvent resistant ... |
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| Understanding Sediment Sources, Pathways and Sinks in Regional Sediment Management: Wash Load and Bed-Material Load Concept |
MAR 2006 |
9 pages |
| Authors:
David S. Biedenharn; Lisa C. Hubbard; Colin R. Thorne; Chester C. Watson; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS
|
| As water resource projects become more and more complex, there is a growing emphasis on the ability to implement effective regional sediment management. A common goal of many regional sediment management (RSM) projects is the reduction of sediment loading from the watershed. This is usually accomplished by rehabilitation features such as grade control, bank stabilization, drop pipes, and land treatments. While these features are often implemented with the stated purpose ... |
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| Friction Stir Processing and Fusion Welding in Nickel Aluminum Propeller Bronze |
MAR 2006 |
87 pages |
| Authors:
Michael D. Fuller; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF MECHANICAL AND ASTRONAUTICAL ENGINEERING
|
| Friction Stir Processing (FSP) is currently being developed for applications including as-cast Nickel- Aluminum Bronze (NAB). Fabrication and repair of the United States Navy's NAB propellers involve fusion welding of as-cast NAB and so it is probable that FSP is likely to encounter as deposited weld metal as well as the more slowly cooled as-cast material. Here, the microstructure and resulting distribution of mechanical properties was examined for a fusion ... |
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| The Electric Oxygen-Iodine Laser: Chemical Kinetics of O2(a1 delta) Production and I(2P1/2) Excitation in Microwave Discharge Systems |
26 JAN 2006 |
16 pages |
| Authors:
W. T. Rawlins; S. Lee; W. J. Kessler; D. B. Oakes; L. G. Piper; S. J. Davis; PHYSICAL SCIENCES INC ANDOVER MA
|
| Generation of singlet oxygen metastables 02(a1DELTA) in an electric discharge plasma offers the potential for development of compact electric oxygen-iodine laser (EOIL) systems using a recyclable all-gas-phase medium. The primary technical challenge for this concept is to develop a high-power scalable electric discharge configuration that can produce high yields and flow rates of O2(a) to support I(2P1/2->2P3/2) lasing at high output power. This paper discusses the chemical kinetics of the ... |
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| Weighted Pushdown Systems and Their Application to Interprocedural Dataflow Analysis |
2006 |
21 pages |
| Authors:
Thomas Reps; Stefan Schwoon; Somesh Jha; WISCONSIN UNIV-MADISON DEPT OF COMPUTER SCIENCES
|
| Recently, pushdown systems (PDSs) have been extended to weighted PDSs, in which each transition is labeled with a value, and the goal is to determine the meet-over-allpaths value (for paths that meet a certain criterion). This paper shows how weighted PDSs yield new algorithms for certain classes of interprocedural dataflow-analysis problems. |
|
| Biotechnology Industry, 2006 |
2006 |
31 pages |
| Authors:
INDUSTRIAL COLL OF THE ARMED FORCES WASHINGTON DC
|
| The United States leads the world in biotechnology, centered on genetic engineering at the cellular or molecular level, a process which applies across a range of products in diverse industries, just as computer engineering does. The biotech industry is becoming a major player in many sectors, including medicine, agriculture, energy, defense, the environment, and nanotechnology. Genetically modified (GM) foods are feeding millions. GM bacteria and plants are cleaning up pollution ... |
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| Memory System Support for Image Processing |
19 OCT 2005 |
18 pages |
| Authors:
Lixin Zhang; John B. Carter; Wilson C. Hsieh; Sally A. McKee; UTAH UNIV SALT LAKE CITY DEPT OF COMPUTER SCIENCE
|
| Processor speeds are increasing rapidly, but memory speeds are not keeping pace. Image processing is an important application domain that is particularly impacted by this growing performance gap. Image processing algorithms tend to have poor memory locality because they access their data in a non-sequential fashion and reuse that data infrequently. As a result, they often exhibit poor cache and TLB hit rates on conventional memory systems, which limits overall ... |
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| 3D Programmable Micro Self Assembly |
19 OCT 2005 |
36 pages |
| Authors:
Karl F. Bohringer; Babak A. Parviz; Eric Klavins; WASHINGTON UNIV SEATTLE
|
| This project has succeeded to: generate new techniques, improve understandings of the physical foundations, and create algorithms for self-assembling systems in 2D and 3D. We have developed a "self assembly tool box" consisting of a range of methods for micro-scale self-assembly in 2D and 3D We have shown physical demonstrations of simple 3D self-assemblies which lead to integration of heterogeneous 3D systems via self-assembly. We have developed models and algorithms ... |
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| A Comparison of the HEFT Subsurface and DELFIC Particle Size Distributions and Effects in HPAC |
19 OCT 2005 |
150 pages |
| Authors:
Eric T. Skaar; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The Heft subsurface three component lognormal fallout particle size distribution is compared and contrasted with the single lognormal fallout particle size distribution used by the Defense Land Fallout Interpretive Code (DELFIC). Comparison of the two distributions is accomplished with results from the AFIT smear code and the Hazard Prediction and Assessment Capability (HPAC). The effect of the distributions is explored in HPAC for varying yield weapons, varying surfaces, precipitation conditions, ... |
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| Process and Energy Optimization Assessment Level II Analysis. Rock Island Arsenal, IL |
AUG 2005 |
234 pages |
| Authors:
Mike C. Lin; Alexander M. Zhivov; David M. Underwood; David I. Osborn; Alfred Woody; Walter P. Smith; Curt Bjork; Michael J. Chimack; Robert A. Miller; ENGINEER RESEARCH AND DEVELOPMENT CENTER CHAMPAIGN IL CONSTRUCTION ENGINEERING RESEARCH LAB
|
| In summer 2004, researchers from the Engineer Research and Development Center, Construction Engineering Research Laboratory (ERDC-CERL) led a Level I Process and Energy Optimization Assessment at Rock Island Arsenal (RIA). The team identified 36 process and energy improvement ideas that could significantly improve the RIA manufacturing mission readiness and competitive position. Arsenal staffs selected 28 measures for a follow on Level II analysis. This report documents the Level II analysis ... |
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| Simulation of Quantum Time-Frequency Transform Algorithms |
20 JUN 2005 |
16 pages |
| Authors:
Chao Lu; TOWSON UNIV MD
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| The demand for exact computation in scientific fields related to quantum physics is not met by the Symbolic Math Toolbox developed in MATLAB. In particular, exact evaluation rational multiples of 2 square is at the heart of efficient implementation of quantum time-frequency transforms. Computations performed using this Toolbox generate erroneous results when used with numbers with more than twenty digits in length. Furthermore, the results of our investigation lead us ... |
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| Constrained Adaptive Beamforming for Improved Contrast in Breast Ultrasound |
JUN 2005 |
31 pages |
| Authors:
William F. Walker; VIRGINIA UNIV CHARLOTTESVILLE
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| Ultrasonic imaging plays an important role as an adjunct to mammography, with an emerging role in breast cancer screening. Ultrasound's real-time nature, lack of ionizing radiation, and relative comfort for the patient make it an attractive imaging choice. Unfortunately, ultrasound image quality is often limited. We hypothesize that bright scatterers seriously degrade ultrasound images by introducing image clutter. In the breast bright off-axis echoes may originate from Cooper's ligaments, structured ... |
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| Interdicting a Force Deployment: Two-Sided Optimization of Asset Selection, Lift Scheduling, and Multi-Commodity Load Planning |
MAR 2005 |
76 pages |
| Authors:
Peter M. Koprowski; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OPERATIONS RESEARCH
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| A military deployment is visible and vulnerable. But, deployments are currently planned assuming they can be completed with surprise, or defended from any threat. JFAST, the current deployment planning and visualization tool of choice, uses heuristics of unknown reliability that yield deployment plans of unknown quality, and ignores vulnerability. We introduce LIFTER, an integer- linear program (ILP) that optimizes a time-phased force deployment (TPFDD) by day, by asset cycle, and ... |
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| Using Multiple MEMS IMUs to form a Distributed Inertial Measurement Unit |
MAR 2005 |
105 pages |
| Authors:
Rayn Hanson; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| MEMS IMUs are readily available in quantity and have extraordinary advantages over conventional IMUs in size, weight, cost, and power consumption. However, the poor performance of MEMS IMUs limits their use in more demanding military applications. It is desired to use multiple distributed MEMS IMUs to simulate the performance of a single, more costly IMU, using the theory behind Gyro-Free IMUs. A Gyro-Free IMU (GF-IMU) uses a configuration of accelerometers ... |
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| The Use of X-Ray Pulsars for Aiding GPS Satellite Orbit Determination |
MAR 2005 |
168 pages |
| Authors:
Dennis W. Woodfork II; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| This research proposes the use of an existing "signal of opportunity" - namely x-ray pulsars - to improve the accuracy and robustness of the GPS satellite and clock estimation algorithm. Improvement in satellite and clock accuracy results in a direct benefit to the user. A simulation has been developed to determine the effects of using x-ray pulsar measurements on the GPS Operational Control Segment. The epoch-specific position, velocity, and clock ... |
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