| Auxetic Metamaterials under Direct Impact Loads in a Structural Health Monitoring Framework |
Jan 2013 |
26 pages |
| Authors:
James Ayers; Ben Chamish; Tzi-Kang Chen; Anindya Ghoshal; Chandan Kittur; Michael Coatney; Natasha Bradley; Tyrone Jones; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
 | Under direct impact from ballistic loads, acoustic waves typically propagate throughout a structural component causing damage to sensitive areas. For structures with intelligent embedded monitoring systems, such as mounted piezoelectric actuators, a direct impact between 150 200 m/s of small-caliber rounds has produced catastrophic results. This report focuses on redirecting acoustic waves using non-traditional structural configurations. The technical approach utilizes periodic and graded metamaterials (produced from auxetic cellular, lattice topology ... |
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| Quantum Yield Enhancement of Cd/Se Colloidal Quantum Dots by Variation of Surface Ligands |
Jan 2013 |
18 pages |
| Authors:
David Gudeman; Witold Palosz; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Colloidal cadmium/selenium (Cd/Se) quantum dots (QDs) were synthesized with two different sets of ligands. The first used simple components, octadecene (ODE), which serves both as a solvent and a ligand, and oleic acid, which also serves as a ligand. The second used more complex ligands, octadecylphosphonic acid, and oleyamine. Transient samples have been collected during the course of each synthesis. Then the particle diameter and quantum yield (QY) of the ... |
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| Analyzing the U.S. Marine Corps Enterprise Information Technology Framework for IT Acquisition and Portfolio Governance |
Sep 2012 |
99 pages |
| Authors:
Timothy R Shives; Laban M Pelz; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This research examined the ongoing development of a Marine Corps-wide, enterprise architecture (EA) approach for assessing the IT planning and investment process, including IT-related programs of record. The EA-approach to an architecture known as the Marine Corps Information Enterprise Technology Strategy (MCIENT-S) is intended to transition Marine Corps into the 21st century by providing Marine Corps leadership with superior decision support. This study evaluated planning and implementation strategies against Return ... |
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| Comparison between a Terramechanics Model and a Continuum Soil Model Implemented within the Absolute Nodal Coordinate Formulation |
Aug 2012 |
10 pages |
| Authors:
Michael D Letherwood; Paramsothy Jayakumar; Guangbu Li; Ulysses Contreras; Craig D Foster; Ahmed A Shabana; ILLINOIS UNIV AT CHICAGO DEPT OF CIVIL AND MATERIALS ENGINEERING
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| In order to determine the best approach for the modeling of tracked vehicle-terrain interactions, a comparison is made between terramechanics and continuum mechanics plasticity soil models that can be used in vehicle dynamic simulations. The absolute nodal coordinate formulation (ANCF) which can be used in multibody system (MBS) dynamics to model large rotations and large deformations will provide a novel framework for this comparison. First, a brief review of the ... |
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| High Strain Rate Mechanical Properties of Glassy Polymers |
25 Jul 2012 |
11 pages |
| Authors:
Jennifer L Jordan; C R Siviour; B T Woodworth; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
|
| Since the early 1990s, a range of experimental data has been generated describing the response of glassy polymers to high strain rate loading in compression. More recently, research programs that study the combined effects of temperature and strain rate have made significant steps in providing better understanding of the physics behind the observed response, and also in modeling this response. However, limited data are available in tension, and even more ... |
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| Infrasound Studies for Yield Estimation of HE Explosions |
05 Jun 2012 |
28 pages |
| Authors:
Paul Golden; Petru Negraru; Jesse Howard; SOUTHERN METHODIST UNIV DALLAS TX
|
| In this report we discuss the capability of estimating the yield of an explosion from infrasound signals generated by low yield chemical explosions. We used several datasets acquired at distances ranging from near source to the limit of the so called Zone of Silence (300 km). In general, the yield of the explosion is estimated either from the peak amplitude or from the dominant period of the observed signal. Near ... |
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| Effect of Chaos on Relativistic Quantum Tunneling |
Jun 2012 |
8 pages |
| Authors:
Xuan Ni; Liang Huang; Ying-Cheng Lai; Louis M Pecora; NAVAL RESEARCH LAB WASHINGTON DC
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| We solve the Dirac equation in two spatial dimensions in the setting of resonant tunneling, where the system consists of two symmetric cavities connected by a finite potential barrier. The shape of the cavities can be chosen to yield both regular and chaotic dynamics in the classical limit. We find that certain pointer states about classical periodic orbits can exist,which suppress quantum tunneling, and the effect becomes less severe as ... |
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| External Validity: From Do-calculus to Transportability Across Populations |
May 2012 |
23 pages |
| Authors:
Judea Pearl; Elias Bareinboim; CALIFORNIA UNIV LOS ANGELES DEPT OF COMPUTER SCIENCE
|
| The generalizability of empirical findings to new environments settings or populations, often called external validity is essential in most scientific explorations. This paper treats a particular problem of generalizability, called transportability defined as a license to transfer causal effects learned in experimental studies to a new population in which only observational studies can be conducted. We introduce a formal representation called selection diagrams for expressing knowledge about differences and commonalities ... |
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| Predicting Coarse Sediment Transport from Patchy Beds in Ephemeral Channels |
Apr 2012 |
37 pages |
| Authors:
Brendan T Yuill; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
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| Seven 1-D sediment transport formulae are employed to predict coarse sediment transport in a low-order, ephemeral channel with patchy bed material. Sediment transport is modeled through two different methods to characterize sediment supply: by using a channelaveraged grain-size distribution (GSD) and by using the mean GSDs from the relatively coarse and fine textured patches that compose the channel bed. Modeling results show that the two different characterizations of the sediment ... |
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| Estimating Yield and Depth of Burial from Rg (POSTPRINT) Annual Report 2 |
20 Mar 2012 |
14 pages |
| Authors:
Jessie Bonner; Aaron Ferris; Robert Reinke; Elizabeth Lenox; WESTON GEOPHYSICAL CORP LEXINGTON MA
|
| We have examined the feasibility of using short-period, fundamental-mode surface waves (Rg) to estimate the yields and depths of burial (DOB) of small chemical explosions recorded at local distances. Rg and other surface wave arrivals were recorded from the HUMBLE REDWOOD I and II (HR I and II) experiments. The experiments were conducted in and above the dry alluvium of Kirtland AFB, NM near the eastern margin of the Albuquerque ... |
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| Toward an Integrated Framwork for Data-Efficient Parametric Adaptive Detection |
27 Feb 2012 |
47 pages |
| Authors:
Hongbin Li; STEVENS INST OF TECHNOLOGY HOBOKEN NJ
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| The conjugate-gradient (CG) algorithm is investigated for reduced-rank STAP detection. A family of CG matched filter (CG-MF) is developed by using the k-th iteration of the CG in solving the Wiener-Hopf equation. The performance the CG-MF detectors is examined for two cases. The first involves an arbitrary covariance matrix. It is shown that each CG-MF detector 1) yields the highest output SINR and smallest MSE among all linear solutions in ... |
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| Mechanical Response of Polycarbonate with Strength Model Fits |
Feb 2012 |
32 pages |
| Authors:
Ajmer Dwivedi; Jermaine Bradley; Daniel Casem; DYNAMIC SCIENCE INC ABERDEEN MD
|
| Experiments were conducted on polycarbonate to investigate how the material responds mechanically at varying deformation rates and elevated temperatures. The data was then used to determine parameters for the Johnson-Cook strength model and the Zerilli-Armstrong polymer strength model. Quasi-static tests were conducted at strain rates between 0.005/s and 0.4/s using a servo-hydraulic load frame. Dynamic compression experiments were performed using the Split Hopkinson Pressure Bar and resulted in strain rates ... |
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| 11.72 sq cm SiC Wafer-scale Interconnected 64 kA PiN Diode |
30 Jan 2012 |
6 pages |
| Authors:
Joe White; S Woodruff; Stuart Davis; M Snook; H Hearne; T McNutt; N El-Hinnawy; V Veliadis; B Nechay; R S Howell; NORTHROP GRUMMAN CORP LINTHICUM HEIGHTS MD ELECTRONIC SENSORS AND SYSTEMS DIV
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| To meet the large current handling requirements of modern power conditioning systems, paralleling of a large number of devices is required. This increases cost and complexity through dicing, soldering, and forming multiple wire bonds. Furthermore, paralleling discrete devices increases package volume/weight and reduces power density. To overcome these complexities, PiN diodes were designed, fabricated at high yields, tested, and interconnected on a three-inch 4H-SiC wafer to form an 11.72 cm2 ... |
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| Evaluation of Sampling and Sample Preparation Modifications for Soil Containing Metallic Residues |
Jan 2012 |
169 pages |
| Authors:
Jay L Clausen; Thomas Georgian; Julie Richardson; Anthony Bednar; Nancy Perron; Andrew Bray; Patricia Tuminello; Larry Penfold; Diane Anderson; Gordon Gooch; ENGINEER RESEARCH AND DEVELOPMENT CENTER HANOVER NH
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| Research over the last decade has revealed that energetic constituents are released into the environment as a result of military training in extremely heterogeneous patterns. Traditional soil sampling and sample preparation methodologies are inadequate to address this level of heterogeneity. Consequently, a number of necessary changes to the accepted soil sampling and sample preparation procedures, which were adopted in a revised U.S. Environmental Protection Agency (USEPA) Method 8330B are identified. ... |
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| AL-Amyloidosis Presenting with Negative Congo Red Staining in the Setting of High Clinical Suspicion: A Case Report |
Jan 2012 |
5 pages |
| Authors:
Kristina Bowen; Nina Shah; Matthew Lewin; WILLIAM BEAUMONT ARMY MEDICAL CENTER EL PASO TX
|
| A histologic diagnosis of amyloidosis requires acquiring tissue containing amyloid fibrils from an affected organ or alternate site. The biopsy site and staining techniques may influence testing accuracy. We present a case in which systemic amyloidosis was suspected; however, biopsies of the bone marrow, an osteosclerotic bone lesion, arterial and venous vessels, and the fat pad were all negative for the diagnostic Congo red stain. An eventual renal biopsy demonstrated ... |
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| Anisotropic Effects on Constitutive Model Parameters of Aluminum Alloys |
Jan 2012 |
7 pages |
| Authors:
Nachhatter S Brar; Vasant S Joshi; NAVAL SURFACE WARFARE CENTER INDIAN HEAD DIV MD
|
| Simulation of low velocity impact on structures or high velocity penetration in armor materials heavily rely on constitutive material models. Model constants are determined from tension compression or torsion stress-strain at low and high strain rates at different temperatures. These model constants are required input to computer codes (LS-DYNA, DYNA3D or SPH) to accurately simulate fragment impact on structural components made of high strength 7075-T651aluminum alloy. Johnson- Cook model constants ... |
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| Analytical Yield Criterion for an Anisotropic Material Containing Spherical Voids and Exhibiting Tension-Compression Asymmetry |
Nov 2011 |
20 pages |
| Authors:
Joel B Stewart; Oana Cazacu; AIR FORCE RESEARCH LAB EGLIN AFB FL MUNITIONS DIRECTORATE
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| This paper is devoted to the development of a macroscopic anisotropic yield criterion for a porous material when the matrix material is incompressible, anisotropic and displays tension - compression asymmetry. The analytical yield criterion is obtained based on micromechanical considerations and non-linear homogenization. The matrix plastic behavior is described by the Cazacu et al. (2006) anisotropic yield criterion that is pressure-insensitive and accounts for strength-differential effects. Comparison between finite element ... |
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| Data-Driven Boundary Correction and Optimization of a Nearshore Wave and Hydrodynamic Model to Enable Rapid Environmental Assessment |
30 Sep 2011 |
5 pages |
| Authors:
James M Kaihatu; TEXAS A AND M UNIV COLLEGE STATION DEPT OF CIVIL ENGINEERING
|
| The present project is part of a comprehensive effort by the PI, his students, and collaborators at the Naval Research Laboratory to increase the robustness and viability of the Delft3D model suite as an operational forecasting tool, and aid its continued transition to Navy forecasting centers. Prior projects have focused on determining the model s response to characteristics and sample sizes of bathymetric information. The present project focuses on determining ... |
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| Spatio-Temporal Characterization of Bio-Acoustic Scatterers in Complex Media |
30 Sep 2011 |
5 pages |
| Authors:
Karim G Sabra; GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING
|
| LONG TERM GOALS To develop a methodology for extracting the relevant spatial and temporal scales of bio-acoustic scatterers based on multi bi-static long-range measurements in shallow water waveguides. OBJECTIVE Characterization of biologically-induced ocean reverberation features is key to effectively parametrize acoustic models and thus ultimately improve the detection performance of long-range SONAR systems. Ocean reverberation signals measured in shallow water can be thought to result from the combined effect of ... |
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| Epitaxial Nucleation on Rationally Designed Peptide Functionalized Interface |
19 Jul 2011 |
16 pages |
| Authors:
Raymond Tu; CITY COLL NEW YORK
|
| Over the course of the grant period we have applied a set of rationally designed interfacially confined peptides to explore the cooperative relationship between self-assembly and hybrid materials processing. This research report highlights our ability to apply the dynamics of surface active peptides to simultaneously control structure at two length scales, (1) the length scale associated with a fibrous peptide supramolecular assembly and (2) the length scale associated with a ... |
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| Entropy: A Unifying Path for Understanding Complexity in Natural, Artificial and Social Systems |
01 JUL 2011 |
32 pages |
| Authors:
Constantino Tsallis; CENTRO BRASILEIRO DE PESQUISAS FISICAS RIO DE JANEIRO
|
| This report summarizes some of the points that were learned from various applications of nonadditive entropy and its associated nonextensive statistical mechanics. The focus of the effort is on understanding and influencing causality of change of complex socio-technical systems. The conclusions include that we can understand that almost uncorrelated N elements yield exponentially increasing (with N) possible collective configurations and that the role of memory emerges as mostly relevant. |
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| Sustainable Land Use for Bioenergy in the 21st Century |
Jun 2011 |
13 pages |
| Authors:
Robert A Diltz; Glenn R Johnson; Heather R Luckarift; UNIVERSAL TECHNOLOGY CORP DAYTON OH
|
| As fossil fuel resources become more difficult to find, the cost of extraction becomes inherently more expensive. Thus, alternative energy solutions must be explored to meet exponentially increasing energy demand due to population growth and industrial development. Solutions that derive energy from alternative resources, including sunlight, wind, tides, and biomass, are in various stages of maturity, ranging from theoretical concepts to commercially available commodities. Power derived from biomass, for example, ... |
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| Using Expressiveness to Increase Efficiency in Social and Economic Mechanisms |
May 2011 |
214 pages |
| Authors:
Michael Benisch; CARNEGIE-MELLON UNIV PITTSBURGH PA SCHOOL OF COMPUTER SCIENCE
|
| Mechanisms for facilitating people's interactions with businesses, their governments, and each other are ubiquitous in today's society. One emerging trend over the past decade, along with increasing computational power and bandwidth, has been a demand for higher levels of expressiveness in such mechanisms. This trend has already manifested itself in combinatorial auctions and generalizations thereof. It is also reflected in the richness of preference expressions allowed by businesses as diverse ... |
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| Depletion-Induced Shape and Size Selection of Gold Nanoparticles (Postprint) |
JAN 2011 |
9 pages |
| Authors:
Kyoungweon Park; Hilmar Koerner; Richard A. Vaia; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| For nanoparticle-based technologies, efficient and rapid approaches that yield particles of high purity with a specific shape and size are critical to optimize the nanostructure-dependent optical, electrical, and magnetic properties, and not bias conclusions due to the existence of impurities. Notwithstanding the continual improvement of chemical methods for shaped nanoparticle synthesis, byproducts are inevitable. Separation of these impurities may be achieved, albeit inefficiently, through repeated centrifugation steps only when the ... |
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| Transfer of CVD-Grown Monolayer Graphene onto Arbitrary Substrates |
Jan 2011 |
10 pages |
| Authors:
Ji W Suk; Alexander Kitt; Carl W Magnuson; Yufeng Hao; Samir Ahmed; Jinho An; Anna K Swan; Bennett B Goldberg; Rodney S Ruoff; TEXAS UNIV AT AUSTIN DEPT OF MECHANICAL ENGINEERING
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| Reproducible dry and wet transfer techniques were developed to improve the transfer of large-area monolayer graphene grown on copper foils by chemical vapor deposition (CVD). The techniques reported here allow transfer onto three different classes of substrates substrates covered with shallow depressions, perforated substrates, and flat substrates. A novel dry transfer technique was used to make graphene-sealed microchambers without trapping liquid inside. The dry transfer technique utilizes a polydimethylsiloxane frame ... |
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| Pairing Heterocyclic Cations with closo-dodecafluorododecaborate (2-) Synthesis of Binary Heterocyclium (1+) Salts and a Ag4(heterocycle)8(4+) Salt of B12F12(2-) |
Jan 2011 |
13 pages |
| Authors:
John L Belletire; Stefan Schneider; Scott A Shackelford; Dmitry V Peryshkov; Steven H Strauss; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIR
|
| Eight binary salts that pair triazolium(1+), imidazolium(1+), pyrimidinium(1+), or puri-nium(1+) cations with the icosahedral closo-dodecafluorododecaborate(2−) anion (B12F122-) were synthesized using open-air benchtop metathesis reactions in water or acetonitrile. The scale of the reactions varied from just milligrams to nearly one gram of the starting material K2B12F12. Other reaction conditions, the scope of the reaction, and the solubilities for the new salts are discussed. Five of the [heterocyclium]2[B12F12] salts, which were ... |
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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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| High Power, High Energy Density Lithium-Ion Batteries |
29 NOV 2010 |
4 pages |
| Authors:
Sonya Zanardelli; ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| OBJECTIVE: High Power, High Energy Density Lithium-Ion Batteries - To improve the current, limited manufacturing capability of 30 Amp-hr battery cells and to provide affordable Lithium-Ion battery packs for the combat and tactical vehicle systems. - To address the manufacturing processes that will reduce cost of lithium-ion battery packs by one half through the improvement of manufacturing process to enhance production consistency and increase the production yield of high power ... |
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| Integrated Cognitive Architectures For Robust Decision Making |
20 Sep 2010 |
41 pages |
| Authors:
JOHN ANDERSON; Christian Lebiere; Randall O'Reilly; Andrea Stocco; CARNEGIE-MELLON UNIV PITTSBURGH PA
|
| Introduction The project s goal was to reproduce robust and intelligent decision making capabilities in artificial agents by integrating two successful cognitive architectures, ACT-R (Anderson, 2007) and Leabra (O Reiily & Munakata, 2000). The rationale was that such an integration effort would yield insights on the general mechanisms that allow rapid decision-making in real-time. Taken separately, ACTR and Leabra incorporate different views of how decision-making and robust behavior occur. The ... |
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| Developing Regionalized Models of Lithospheric Thickness and Velocity Structure Across Eurasia and the Middle East from Jointly Inverting P-Wave and S-Wave Receiver Functions with Rayleigh Wave Group and Phase Velocities |
Sep 2010 |
12 pages |
| Authors:
Jordi Julia; Andrew A Nyblade; Arthur J Rodgers; Eric Matzel; PENNSYLVANIA STATE UNIV HERSHEY
|
| The main goal of this project is to develop regionalized models of lithospheric velocity structure for a wide variety of tectonic regions throughout Eurasia and the Middle East. We expect the regionalized models will improve the ability of the National Nuclear Security Administration (NNSA) labs to predict travel times for local and regional phases, such as Pg, Pn, Sn and Lg, as well as travel times for body waves at ... |
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| Sayarim Infrasound Calibration Explosion: Near-Source and Local Observations and Yield Estimation |
Sep 2010 |
14 pages |
| Authors:
Yefim Gitterman; GEOPHYSICAL INST OF ISRAEL HOLON (ISRAEL)
|
| A large-scale calibration explosion of about 82 tons of high explosives (HE), assembled as a pyramid on a soft sediment surface, was successfully conducted by the Geophysical Institute of Israel (GII) at Sayarim Military Range (SMR), Negev Desert, Israel, on 26 August 2009. Near-source high-pressure values, measured in the range 200600 m, were higher than predicted, whereas the resulting crater and the seismic magnitude were smaller than expected for this ... |
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| A Quaternary Decision Diagram Machine: Optimization of Its Code |
Aug 2010 |
11 pages |
| Authors:
Tsutomu Sasao; Hiroki Nakahara; Munehiro Matsuura; Yoshifumi Kawamura; Jon T Butler; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| This paper first reviews the trends of VLSI design, focusing on the power dissipation and programmability. Then, we show the advantage of Quarternary Decision Diagrams (QDDs) in representing and evaluating logic functions. That is, we show how QDDs are used to implement QDD machines, which yield high-speed implementations. We compare QDD machines with binary decision diagram (BDD) machines, and show a speed improvement of 1.28-2.02 times when QDDs are chosen. ... |
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| Screening for Inhibitors of Essential Leishmania Glucose Transporters |
JUL 2010 |
17 pages |
| Authors:
Scott M. Landfear; Diana Ortiz; Johanna Hayenga; Yuko Sato; OREGON HEALTH AND SCIENCE UNIV PORTLAND
|
| The major objective of this project is to identify compounds that function as selective inhibitors of the essential glucose transporters of the parasite Leishmania mexicana. Toward this end, a cell growth assay has been developed that can be employed in a high throughput screen (HTS) for such inhibitors. The dye SYBR green has been identified as the optimal reagent for following cell growth by fluorescence. The assay has been optimized ... |
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| The Science and Technologies for Fusion Energy With Lasers and Direct-Drive Targets |
Apr 2010 |
15 pages |
| Authors:
J D Sethian; D G Colombant; Jr Giuliani J L; R H Lehmberg; M C Myers; S P Obenschain; A J Schmitt; J Weaver; M F Wolford; F Hegeler; NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
|
| We are carrying out a multidisciplinary multiinstitutional program to develop the scientific and technical basis for inertial fusion energy (IFE) based on laser drivers and directdrive targets. The key components are developed as an integrated system, linking the science, technology, and final application of a 1000-MWe pure-fusion power plant. The science and technologies developed here are flexible enough to be applied to other size systems. The scientific justification for this ... |
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| Increasing Effectiveness of Local Partnerships in Counter Insurgency with Commercial Imagery |
Jan 2010 |
3 pages |
| Authors:
Mark Cobos; ARMY SPACE AND MISSILE DEFENSE COMMAND/ARMY FORCES STRATEGIC COMMAND PETERSON AFB CO
|
| The first of GEN Stanley McChrystal's Eight Imperatives for Success in Afghanistan addresses the basic tenet of modern counterinsurgency: We must protect and partner with the security forces, tribal and governmental leaders, and local councils to build their capacity to secure their own countries and reinforce local institutions. In fact, the fundamental core of Coalition success in counterinsurgency operations in Afghanistan and Iraq is this ability to form meaningful partnerships ... |
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| Optimization of Highway Work Zone Decisions Considering Short-Term and Long-Term Impacts |
Jan 2010 |
253 pages |
| Authors:
Ning Yang; MARYLAND UNIV COLLEGE PARK
|
| With the increase of the number, duration, and scope of maintenance projects on the national highway system, transportation agencies face great challenges in developing effective comprehensive work zone management plans which minimize the negative impacts on road users and workers. The types of maintenance operation, timing duration, configuration, and user impact mitigation strategies are major considerations in developing work zone management plans. Some of those decisions may not only affect ... |
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| Viral Penetration of High Efficiency Particulate Air (HEPA) Filters (PREPRINT) |
Sep-2009 |
|
| 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
|
| 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
|
| 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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| Dense Heterogeneous Integration for InP Bi-CMOS Technology |
May 2009 |
7 pages |
| Authors:
Y Royter; P R Patterson; J C Li; K R Elliiott; T Hussain; M F Boag-O'Brien; J R Duvall; M C Montes; D A Hitko; J S Sewell; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| InP Bi-CMOS technology capable of wafer-scale device-level heterogeneous integration (HI) of InP HBTs and CMOS has been developed. With this technology, full simultaneous utilization of III-V device speed and CMOS circuit complexity is possible. Simple ICs and test structures have been fabricated, showing no significant CMOS or HBT degradation and high heterogeneous interconnect yield. The heterogeneously integrated differential amplifiers with record performance and HBTs with fT=400GHz were obtained. Thermal vias ... |
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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
|
| 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
|
| 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
|
| 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:
Benjamin G Harvey; Michael E Wright; Roxanne L Quintana; NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
|
| 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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| A Quaternary Decision Diagram Machine and the Optimization of Its Code |
2009 |
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| Authors:
Tsutomu Sasao; Hiroki Nakahara; Munehiro Matsuura; Yoshifumi Kawamura; Jon T. Butler; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| We show the advantage of Quarternary Decision Diagrams (QDDs) in representing and evaluating logic functions. That is, we show how QDDs are used to implement QDD machines, which yield high-speed implementations. We compare QDD machines with binary decision diagram (BDD) machines, and show a speed improvement of 1.28- 2.02 times when QDDs are chosen. We consider 1-and 2- address BDD machines, and 3- and 4-address QDD machines, and we show ... |
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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
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| 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
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| 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
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| 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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Reports by Keyword(s)
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