| Fabrication and Characterization of Two-Dimensional Periodic Plasmonic Nanostructures |
05 Nov 2012 |
7 pages |
| Authors:
Marco Grande; Tiziana Stomeo; GRANDE (MARCO) TRANI (ITALY)
|
 | During the project, we have investigated the linear and nonlinear response of two dimensional gold square-nanopatch arrays. We have shown that these arrays exhibit very narrow resonances corresponding to the formation of leaky modes associated with surface plasmons at the air/metal interfaces. The experimental measurements have confirmed the spectral behaviour predicted by the simulations and emphasized that fabrication tolerances, such as the roughness, do not noticeably affect the performance of ... |
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| Growth of Gallium Nitride Nanorods and Their Coalescence Overgrowth |
07 Sep 2012 |
24 pages |
| Authors:
Chih-Chung Yang; NATIONAL TAIWAN UNIV TAIPEI
|
| With the nano-imprint lithography and the pulsed growth mode of metalorganic chemical vapor deposition, a regularly-patterned, c-axis nitride nanorod (NR) array of quite uniform geometry with simultaneous depositions of top-face, c-plane disc-like and sidewall, m-plane core-shell InGaN/GaN quantum well (QW) structures is formed. The differences of geometry and composition between these two groups of QW are studied with scanning electron microscopy, cathodoluminescence, and transmission electron microscopy (TEM). In particular, the ... |
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| Maintaining Multimedia Data in a Geospatial Database |
Sep 2012 |
57 pages |
| Authors:
Mitchakima D Banks; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF COMPUTER SCIENCE
|
| This thesis resulted from a project in which imagery was captured and automatically stored. Historical data were integrated with it and made available through the network to permit a TIVO-style replay of events anywhere within a city limit, with higher spatial and temporal resolution on hotspots. The purpose was to allow law enforcement personnel to go back in time to a location and recover imagery/video of interest in a timely ... |
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| Culmination of Coaxial Injector Mixing Studies |
Sep 2012 |
5 pages |
| Authors:
Ivett Leyva; Doug Talley; Juan Rodriguez; Sophonias Teshome; Dustin Davis; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
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| ROTATESTL: A MATLAB Rotation Algorithm for the Analysis of Computational Meshes in Stereolithography File Format |
Sep 2012 |
70 pages |
| Authors:
James A Tancred; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AEROSPACE SYSTEMS DIR
|
| With the continued increase in power of the modern computer, more computational problems are tractable via computer simulation, leading to fast production of data, analysis, and quantitative solutions. Discrete three dimensional analyses, including those involving computational fluid dynamics, now show even more promise as the time required to meet solutions has been shown, in some instances, to be on the order of hours and days rather than weeks or months ... |
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| Geometric Networks Analysis |
12 Aug 2012 |
4 pages |
| Authors:
Gunnar Carlsson; Mike Mahoney; STANFORD UNIV CA
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| The main goal of the project was to develop and use algorithmic tools with a geometric underpinning to analyze large networks. For example, the Internet, social networks, connectivity properties between genes or proteins in a biological cell, and other types of data that may be viewed as finite metric spaces can all be fruitfully modeled as a network or a graph G = (V,E) consisting of nodes and edges. A ... |
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| Three-Dimensional Flow Modeling of McNary Dam Forebay, Columbia River |
Aug 2012 |
55 pages |
| Authors:
E A Hammack; David S Smith; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
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| The U.S. Army Corps of Engineers, Walla Walla District (NWW), requested that the U.S. Army Engineer Research and Development Center, Coastal and Hydraulics Laboratory (ERDC-CHL) model the flow conditions of McNary Dam forebay. The different flows are produced by various powerhouse/spillbay operating conditions for certain river discharges. The flow conditions, powerhouse operation schedule, and spillbay opening geometry were provided by NWW. This report contains a description of the geometry, meshing, ... |
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| In-Situ Neutron Diffraction Study of Aging of a Mg-Y-Nd-Zr Alloy (WE43): Effects of Precipitation on Individual Deformation Mechanisms |
Jul 2012 |
9 pages |
| Authors:
S R Agnew; III Polesak F J; B Clausen; VIRGINIA UNIV CHARLOTTESVILLE DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| There is an outstanding question regarding why the age hardening response of Mg alloys is not nearly as good as many competing Al alloys. It has recently been proposed that the effect is due to precipitate geometry, since most commercial Mg alloys form either basal plate-shaped precipitates (e.g. AZ alloys) or c-axis aligned rod-shaped precipitates (e.g. ZK alloys) [1], and these are among the least effective precipitate shapes to obstruct ... |
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| Integrated Robot Task and Motion Planning in the Now |
29 Jun 2012 |
71 pages |
| Authors:
Leslie P Kaelbling; Tomas Lozano-Perez; MASSACHUSETTS INST OF TECH CAMBRIDGE COMPUTER SCIENCE AND ARTIFICIAL INTELLIGENCE LAB
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| This paper provides an approach to integrating geometric motion planning with logical task planning for long-horizon tasks in domains with many objects. We propose a tight integration between the logical and geometric aspects of planning. We use a logical representation which includes entities that refer to poses, grasps, paths and regions, without the need for a priori discretization. Given this representation and some simple mechanisms for geometric inference,we characterize the ... |
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| Combustion Characteristics of Condensed Phase Reactions in Sub-Centimeter Geometries |
10 Jun 2012 |
10 pages |
| Authors:
Eric J Miklaszewski; Steven F Son; Lori J Groven; Jay C Poret; Anthony P Shaw; Gary Chen; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ PYROTECHNICS TECHNOLOGY AND PROTOTYPING DIV
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| In this work, the combustion characteristics of the exothermic systems Ti/C, Ni/Al, 3Ni/Al and combinations thereof, are examined in small diameter aluminum tubes (3-6 mm ID). Tailoring the overall exothermicity of the reactant system is accomplished by varying the reaction combination, stoichiometry, and the addition of alumina as a diluent. For the combined reactive system, Ti/C-3Ni/Al, it is shown that at 40 wt.% Ti/C content, the failure diameter lies between ... |
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| High-Resolution Large-Field-of-View Ultrasound Breast Imager |
Jun 2012 |
47 pages |
| Authors:
Patrick J La Riviere; CHICAGO UNIV IL
|
| In this work, we are seeking to construct and test the first practical full-field transmission ultrasound breast imaging system. The system will have a large field-of-view capable of producing 2D images of the entire breast in near real-time. Because it uses a fixed imaging geometry that does not involve scanning, it will also circumvent the operator-dependence of conventional ultrasound imaging methods. We have made substantial progress in this first year ... |
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| The Operational Calculus: It's Not Art |
22 May 2012 |
173 pages |
| Authors:
Michael McRoberts; NATIONAL DEFENSE UNIV NORFOLK VA JOINT ADVANCED WARFIGHTING SCHOOL
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| The current state of military understanding is in crisis, resulting from the application of a linear thought process to dynamic, complex problems. The crisis does not originate in a lack of creativity. To the contrary, the crisis lies in an unfounded faith in the innate creative ability of the commander and his staff. This faith manifests in the joint doctrinal characterization of operational art as creative imagination, which in practice ... |
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| Cooperative Non-Line-of-Sight Localization Using Low-rank + Sparse Matrix Decomposition |
10 May 2012 |
9 pages |
| Authors:
Venkatesan Ekambaram; Kannan Ramchandran; CALIFORNIA UNIV BERKELEY DEPT OF ELECTRICAL ENGINEERING AND COMPUTER SCIENCE
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| We consider the problem of estimating the locations of a set of points in a k-dimensional euclidean space given a subset of the pairwise distance measurements between the points. We focus on the case when some fraction of these measurements can be arbitrarily corrupted by large additive noise. This is motivated by applications like sensor networks, molecular conformation and manifold learning where the measurement process can induce large bias errors ... |
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| Discovering Structure via Matrix Rank Minimization |
25 Apr 2012 |
8 pages |
| Authors:
Stephen A Vavasis; Henry Wolkowicz; WATERLOO UNIV (ONTARIO)
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| During this three-year project, Vavasis and Wolkowicz, together with students, postdocs, and colleagues, made a number of advances in the convex optimization and its application to data mining and sensor localization. In this report we highlight some of these accomplishments. |
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| Generalized Entropies and Legendre Duality |
22 Apr 2012 |
84 pages |
| Authors:
Keiko Uohashi; TOHOKU GAKUIN UNIV SENDAI (JAPAN)
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| They have shown that a simple and computationally efficient algorithm can be derived to construct the alpha-Voronoi diagrams on the space of discrete probability distributions to make use of conformally flattened structure of alpha-geometry. They also studied 1) geometry for q-exponential families which are related with alpha-geometry, and its statistical applications, and 2) conformal flatness of level surfaces in Hessian domains. Especially they studied harmonic maps between level surfaces of ... |
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| Aluminum Cluster-Based Materials for Propulsion and Other Applications and Catalysis |
04 Apr 2012 |
18 pages |
| Authors:
Shiv N Khanna; VIRGINIA COMMONWEALTH UNIV RICHMOND
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| During the current project, we have identified classes of stable cluster motifs for implementation as building blocks of nanoenergetic materials and developed guiding principles for their synthesis. To begin, differing mechanisms that can stabilize clusters were identified. The first refers to crystal field like splitting of electronic shells via geometrical distortions that can lead to stable species at sub-shell fillings. Such a mechanism accounted for the stability of CuAl22- and ... |
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| Isogeometric Divergence-conforming B-splines for the Steady Navier-Stokes Equations |
Apr 2012 |
72 pages |
| Authors:
John A Evans; Thomas J Hughes; TEXAS UNIV AT AUSTIN INST FOR COMPUTATIONAL ENGINEERING AND SCIENCES
|
| We develop divergence-conforming B-spline discretizations for the numerical solution of the steady Navier-Stokes equations. These discretizations are motivated by the recent theory of isogeometric discrete differential forms and may be interpreted as smooth generalizations of Raviart-Thomas elements. They are (at least) patchwise C0 and can be directly utilized in the Galerkin solution of steady Navier-Stokes flow for single-patch configurations. When applied to incompressible flows, these discretizations produce pointwise divergence-free velocity ... |
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| Isogeometric Divergence-conforming B-splines for the Unsteady Navier-Stokes Equations |
Apr 2012 |
49 pages |
| Authors:
John A Evans; Thomas J Hughes; TEXAS UNIV AT AUSTIN INST FOR COMPUTATIONAL ENGINEERING AND SCIENCES
|
| Divergence-conforming B-splines are developed for application to the incompressible Navier-Stokes equations on geometrically mapped domains. These enable smooth pointwise divergence-free solutions and thus satisfy mass conservation in the strongest possible sense. Semi-discrete methods based on divergence-conforming B-splines are shown to conserve linear and angular momentum and satisfy balance laws for energy vorticity, enstrophy, and helicity. These are geometric structure-preserving quantities and numerical simulations that are sensitive to them are shown ... |
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| The Focusing of Light Scattered from Diffuse Reflectors Using Phase Modulation |
22 Mar 2012 |
78 pages |
| Authors:
Jessica Schafer; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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| Indirect photography was recently demonstrated for imaging hidden scene information through the collection and radiometric modeling of light reflecting off of visible reflecting surfaces. The ability to focus the beam that reflects off the visible surface to a tight spot on the hidden object is theorized to simulate a direct line of sight from the light source to the object, reducing the radiometric model to that of the previously demonstrated ... |
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| Continuous and Discontinuous Galerkin Methods for a Scalable Three-Dimensional Nonhydrostatic Atmospheric Model: Limited-Area Mode |
09 Mar 2012 |
44 pages |
| Authors:
James F Kelly; Francis X Giraldo; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF APPLIED MATHEMATICS
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| This paper describes a unified, element based Galerkin (EBG) framework for a three-dimensional, nonhydrostatic model for the atmosphere. In general EBG methods possess high-order accuracy, geometrical flexibility, excellent dispersion properties and good scalability. Our nonhydrostatic model, based on the compressible Euler equations, is appropriate for both limited-area and global atmospheric simulations. Both a Continuous Galerkin (CG), or spectral element, and discontinuous Galerkin (DG) model are considered using hexahedral elements. The ... |
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| Solar Energetic Electron Probes of Magnetic Cloud Field Line Lengths (Postprint) |
02 Mar 2012 |
16 pages |
| Authors:
S W Kahler; S Krucker; A Szabo; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
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| Magnetic clouds (MCs) are large interplanetary coronal mass ejections of enhanced and low variance fields with rotations indicative of magnetic flux ropes originally connected to the Sun. The MC flux rope models require field lines with larger pitch angles and longer lengths with increasing distance from the MCaxis. While the models can provide good fits to the in situ solar wind observations, there have not been definitive observational tests of ... |
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| Exploration of an Opportunistic Overlaid Paradigm for Complex Networks via Stochastic Geometry |
01 Mar 2012 |
7 pages |
| Authors:
Shuguang Cui; Long Gao; Soummya Kar; Qing Zhou; Lauren Huie; Vince H Poor; Meng Zeng; Rui Zhang; Di Li; Changchuan Yin; TEXAS A AND M UNIV COLLEGE STATION DEPT OF ELECTRICAL ENGINEERING
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| In this project, we focused on large complex networks and mainly investigated the following major issues: 1) We studied the overlaid complex networking systems where a primary network tier is coexisting with an opportunistic network tier. With stochastic geometry tools, we first showed that both tiers could achieve the same throughput scaling and then showed that the primary throughput scaling can be improved by allowing the opportunistic tier to help ... |
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| 3-D Scene Reconstruction from Aerial Imagery |
Mar 2012 |
183 pages |
| Authors:
Jared M Ekholm; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| 3-D scene reconstructions derived from Structure from Motion (SfM) and Multi-View Stereo (MVS) techniques were analyzed to determine the optimal reconnaissance flight characteristics suitable for target reconstruction. In support of this goal, a preliminary study of a simple 3-D geometric object facilitated the analysis of convergence angles and number of camera frames within a controlled environment. Reconstruction accuracy measurements revealed at least 3 camera frames and a 6 convergence angle ... |
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| Epithelial and Stromal Spectral Imaging for Rapid Surgical Margin Analysis |
Mar 2012 |
18 pages |
| Authors:
Ashley Laughney; Venkataramanan Krishnaswamy; Keith Paulsen; Brian Pogue; DARTMOUTH COLL HANOVER NH
|
| A new, scanning beam spectroscopy platform was developed to dramatically improved image acquisition speed of localized light scattering. The new scanning in situ spectroscopy platform samples broadband reflectance from a 150 microns diameter spot over a 1 sq cm field using a dark field geometry and telecentric lens; the system was designed to balance sensitivity to stromal and epithelial distributions, while sufficiently imaging the inherent diversity within a diagnosis. The ... |
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| Geometric Methods for Controlled Active Vision |
07 Feb 2012 |
31 pages |
| Authors:
Allen Tannenbaum; GEORGIA TECH RESEARCH INST ATLANTA
|
| In this just completed research program, we developed several new directions for our work in controlled active vision. We have developed a general framework for geometric observer-like structures based on non-parametric implicit (level set) curve descriptions of dynamically varying shapes. Special emphasis was given to the geometric nature of the dynamical system as well as the key issue of robustness. In particular, we formulated an approach to the problem of ... |
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| Contributions to Automated Realtime Underwater Navigation |
Feb 2012 |
198 pages |
| Authors:
Michael J Stanway; MASSACHUSETTS INST OF TECH CAMBRIDGE JOINT PROGRAM IN APPLIED OCEAN SCIENCE AND ENGINEERING
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| This dissertation presents three separate but related contributions to the art of underwater navigation. These methods may be used in postprocessing with a human in the loop, but the overarching goal is to enhance vehicle autonomy, so the emphasis is on automated approaches that can be used in realtime. The three research threads are: i) in situ navigation sensor alignment, ii) dead reckoning through the water column, and iii) model-driven ... |
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| Fabrication, Characterization, and Wettability Analysis of a Microstructured Hybrid Hydrophobic/Hydrophilic Surface |
Jan 2012 |
80 pages |
| Authors:
Timothy P Garvin; ILLINOIS UNIV AT URBANA-CHAMPAIGN DEPT OF MECHANICAL SCIENCE AND ENGINEERING
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| This thesis explores the effects of surface chemistry and geometry on wettability of Hybrid Surfaces. The Hybrid Surfaces are composed of many micropillars with hydrophobic sidewalls and hydrophilic tops. The surfaces are designed with stable dropwise condensation in mind, which can increase heat fluxes by an order of magnitude over those of filmwise condensation. Based on the literature and technical constraints on fabrication, four Hybrid Surfaces are designed, fabricated characterized ... |
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| Testing the Accuracy of Microstructure Reconstruction in Three Dimensions Using Phantoms |
Jan 2012 |
20 pages |
| Authors:
S D Sintay; A D Rollett; CARNEGIE-MELLON UNIV PITTSBURGH PA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| Three-dimensional (3D) multi-region explicit geometric modeling of implicit images of polycrystalline materials microstructure is tested for accuracy and fitness using 3D Phantom geometries. Implicit data sets are generated from the explicit phantoms by sampling the phantoms over a range of resolutions from which explicit representations are then reconstructed. The reconstructed models are tested for error against the phantoms to characterize the accuracy of the reconstruction techniques as a function of ... |
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| Giant Field Localization in 2-D Photonic Crystal Cavities with Defect Resonances: Bringing Nonlinear Optics to the W/cm2 Level |
Jan 2012 |
8 pages |
| Authors:
Nadia Mattiucci; Mark J Bloemer; Giuseppe D'Aguanno; AEGIS TECHNOLOGIES GROUP INC HUNTSVILLE AL NANOGENESIS DIV
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| We investigate the field localization properties in a 2-D photonic crystal cavity with defect resonances. Although based on a simple geometry, these resonances achieve extremely high quality (Q)-factors 108. We provide an example of a chalcogenide glass (As2S3) photonic crystal cavity where all-optical switching at telecommunication wavelengths can be obtained for input intensity W/cm2 and local field intensity in the crystal well below the photodarkening threshold of the material. |
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| DCT-TCI: Real Gas Characterization of Plasma Flow Control - An Integrated Approach |
23 Dec 2011 |
18 pages |
| Authors:
Subrata Roy; Chin-Cheng Wang; Ryan Durscher; FLORIDA UNIV GAINESVILLE DEPT OF MECHANICAL AND AEROSPACE ENGINEERING
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| This report presents results culminated partially from the AFOSR grant FA9550-09-1-0372 on experimental and numerical characterization of novel plasma actuators. Specifically the serpentine and multi-barrier plasma actuators are considered. The serpentine geometry demonstrated capability for the inducement of fully three dimensional vortical structures. The nature of the fluid flow inducement on a flat plate, in quiescent conditions, due to dielectric barrier discharge (DBD) plasma actuators is numerically and experimentally investigated. ... |
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| Testing Refinement Criteria in Adaptive Discontinuous Galerkin Simulations of Dry Atmospheric Convection |
22 Dec 2011 |
26 pages |
| Authors:
Andreas Mueller; Joern Behrens; Francis X Giraldo; Volkmar Wirth; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF APPLIED MATHEMATICS
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| Adaptive mesh refinement generally serves to increase computational efficiency without compromising the accuracy of the numerical solution. However it is an open question in which regions the spatial resolution can actually be coarsened without affecting the accuracy of the result. This question is investigated for a specific meteorological problem, namely the simulation of atmospheric convection. For this purpose a novel numerical model is developed that is tailored towards this specific ... |
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| Remote Sensing of Layered Random Media Using the Radiative Transfer Theory |
Dec 2011 |
27 pages |
| Authors:
Saba Mudaliar; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIRECTORATE
|
| The Radiative Transfer (RT) approach is widely used in applications involving scattering from layered random media with rough interfaces. Although this approach involves approximations, in most applications they are not explicitly stated or well understood. In order to better understand the RT approach to our problem, we adopt a statistical wave approach and then transition to the RT equations. The geometry of our problem consists of a multi-layer discrete random ... |
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| Transient Eddy-Current Nondestructive Evaluation: Benchmark Data for Backface Slots in a Plate |
Dec 2011 |
23 pages |
| Authors:
S K Burke; M E Ibrahim; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION CANBERRA (AUSTRALIA)
|
| The results of a benchmark experiment for transient eddy-current nondestructive evaluation are reported. The benchmark configuration corresponds to the canonical geometry of an air-cored probe coil positioned above a conductive plate containing a long back-face slot. The coil is excited by an exponentially-damped step function current and measurements are made of the change in the transient magnetic field due to the slot. The aim of the work is to provide ... |
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| 2D Mesh Manipulation |
Nov 2011 |
98 pages |
| Authors:
James S Masters; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFB TN
|
| Unstructured methods for region discretization have become common in computational fluid dynamics (CFD) analysis because of certain benefits they have over structured meshes (where the discretization of the domain reflects some type of consistent geometrical regularity). Unstructured meshes are powerful tools for efficiently defining complex geometries and also lend themselves to analysis techniques such as adaptive mesh refinement (AMR) where the properties of the mesh adapt to the properties of ... |
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| Lamb Wave Propagation in a Restricted Geometry Composite PI-Joint Specimen (Preprint) |
Nov 2011 |
10 pages |
| Authors:
James L Blackshire; Som Soni; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| The propagation of elastic waves in a material can involve a number of complex physical phenomena, resulting in both subtle and dramatic effects on detected signal content. In recent years, the use of advanced methods for characterizing and imaging elastic wave propagation and scattering processes has increased, where for example the use of scanning laser vibrometry and advanced computational models have been used very effectively to identify propagating modes, scattering ... |
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| Coaxial Jets Subjected to External Acoustics |
20 Oct 2011 |
28 pages |
| Authors:
Ivett Leyva; Sophonias Teshome; Juan Rodriguez; Jeff Graham; Doug Talley; Ann Karagozian; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Modern rockets operate at supercritical pressures with respect to propellants. There is a need to understand mixing and combustion beyond liquid and gas states. Shear coaxial injectors are a common choice for cryogenic liquid rocket engines. Interactions of transverse acoustics with an injector's own modes and mixing need to be understood in terms of combustion instability. There is a need to understand the differences in response to pressure and velocity ... |
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| Towards a Fast Dynamic Model of the Human Circulatory System |
06 Oct 2011 |
35 pages |
| Authors:
M A Green; C R Kaplan; J P Boris; E S Oran; NAVAL RESEARCH LAB WASHINGTON DC
|
| We describe a model for blood transport in the human circulatory system that is based on a set of equations for an unsteady elastic pipe-flow circuit. The Navier-Stokes equations are collapsed from three spatial dimensions and time to one spatial dimension and time by assuming axisymmetric vessel geometry and a parabolic velocity profile across the cylindrical vessels. Contractions of a beating heart that drive the fluid are modeled as prescribed ... |
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| Scalable Heterogeneous Multiagent Teams Through Learning Policy Geometry |
Oct 2011 |
7 pages |
| Authors:
Kenneth O Stanley; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
| This document is the final technical report for Phase II of the DARPA Computer Science Study Group (CSSG) program started by the PI in the year 2008. (Phase II itself began for the PI in 2009.) It follows the reporting requirements specified in the award document for the project. |
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| Challenges of Zinc-Specific Transrectal Fluorescence Tomography to Detect Prostate Cancer |
Oct 2011 |
19 pages |
| Authors:
Guan Xu; Daqing Piao; OKLAHOMA STATE UNIV STILLWATER
|
| We developed novel instrumentation and algorithm methods in response to the challenges specific to prostate cancer detection by trans-rectal fluorescence tomography imaging of the negative-uptake distribution of zinc-specific fluorophore. Specifically, we demonstrated a new configuration of swept-spectral-encoding for sequential-source-excitation in DOT that is applicable to FDOT for rapid differentiation of fluorescence excited by DC sources in the current system; we developed a new reconstruction algorithm in DOT that is extendable ... |
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| Millimeter-wave Interferometric Sensing |
Sep 2011 |
20 pages |
| Authors:
Charles R Dietlein; Amir Zaghloul; David A Wikner; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Millimeter-wave sensing systems designed for imaging almost always produce inferior images compared to their infrared and visible wavelength counterparts for a variety of fundamental reasons. These reasons include low detector/pixel count, poor signal-to-noise ratio, artifacts introduced by illumination, and issues arising from calibration or scanning schemes. This research effort is intended to address the issue of low-detector-count focal-plane arrays (FPA). Radio astronomers have dealt with this issue for many decades ... |
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| Chemical vs. Sonochemical Synthesis and Characterization of Silver, Gold, and Hybrid Nanoparticles |
Sep 2011 |
24 pages |
| Authors:
Vinay V Dandekar; Hailey E Cramer; Eric N Lee; Mark H Griep; Shashi P Karna; ARMY RESEARCH LAB ADELPHI MD SENSORS AND ELECTRON DEVICES DIRECTORATE
|
| Silver (Ag), gold (Au), and alloy nanoparticles synthesized chemically and Au-Ag core-shell sonochemically produced nanoparticles were investigated for their potential applications in solar cells, biology, transistors, and light-emitting diodes (LEDs). The alloy or core-shell structure can be useful for creating new particles that have the properties of both the core material and the shell material. The Au, Ag, and Au-Ag nanoparticles were characterized optically and structurally by using ultraviolet-visible (UV-Vis) ... |
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| User-based Software Tool for S-Parameter Conversion and Manipulation |
Sep 2011 |
22 pages |
| Authors:
Scott Trocchia; Tony Ivanov; Robert Proie; ARMY RESEARCH LAB ADELPHI MD
|
| S-parameters fully characterize the linear behavior of an arbitrary number of ports. We aim to characterize various field-effect transistors (FETs), each having a certain gate width and geometry, from their S-parameters. We extract the data from the vector network analyzer in real-time and perform a series of calculations and conversions on the initial S-parameters. Using a software tool written in C++ that interfaces with the vector network analyzer (VNA), the ... |
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| Genetic Programming-based Phononic Bandgap Structure Design |
Sep 2011 |
36 pages |
| Authors:
Raymond A Wildman; George A Gazonas; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Two-dimensional phononic bandgap materials are designed using a genetic programming topology optimization method and a finite element elastic wave solver. The optimization problem involves maximizing the bandgap, or range of blocked frequencies of propagating elastic waves, in a periodic structure by designing the shape of an inclusion. This problem is modeled as a single unit cell using the time-harmonic elastodynamic wave equation with Floquet (periodic) boundary conditions. After discretization, an ... |
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| A Pn Spreading Model Constrained with Observed Amplitudes in Asia |
Sep 2011 |
13 pages |
| Authors:
Xiaoning Yang; LOS ALAMOS NATIONAL LAB NM
|
| By modeling synthetic Pn amplitudes in 2007, my colleagues and I proposed a Pn geometric-spreading model (Y2007) that takes into account the spherical shape of the Earth. In this study, we used a set of observed Pn amplitudes from the tectonically active regions of Asia to evaluate the performance of Y2007 and to develop new observation-based Pn spreading models. Even though Y2007 provides improved geometric-spreading correction of Pn amplitudes over ... |
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| Geometric Methods for ATR: Shape Analysis, Object/Image Metrics, Shape Reconstruction, and Shape Statistics |
15 Aug 2011 |
12 pages |
| Authors:
Peter F Stiller; Amanda Johnson; TEXAS A AND M UNIV COLLEGE STATION DEPT OF MATHEMATICS
|
| This report summarizes the work done over the approximately three years of this project. Our general focus has been on the employment of advanced mathematical techniques from algebraic and differential geometry to solve various problems associated with object recognition. The principal framework has been the theory of object/image equations and object/image metrics which we have developed and exploited in multiple contexts and for multiple sensor types. This included not only ... |
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| Target Modeling for Ground Mobile Branch (GMB) |
Aug 2011 |
13 pages |
| Authors:
Matthew Schulz; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD SURVIVABILITY/LETHALITY ANALYSIS DIRECTORATE
|
| This report documents my efforts and the insights I have gained while serving as a target modeler for the Ground Mobile Branch (GMB) of the Survivability Lethality Analysis Directorate (SLAD). In support of the Branch's role of providing modeling and simulation support through the ballistic analysis of current and future vehicular systems, my primary task was to gain knowledge and insight into the analysis process through understanding the role SLAD ... |
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| Target Positioning and Tracking in Degenerate Geometry |
Jul 2011 |
9 pages |
| Authors:
Chun Yang; Lance Kaplan; Erik Blasch; Michael Bakich; SIGTEM TECHNOLOGIES INC SAN MATEO CA
|
| This paper analyzes the effects of special target-sensor geometries, particularly, some degenerate cases (near singular observation matrix), on the performance of target positioning and tracking. A scenario of practical significance is when two or more sensors form nearly parallel line of sight (LOS) vectors to targets. Examples include netted radars that happen to line up their observations in azimuth. Such encounter geometry is degenerate for conventional methods. In this paper, ... |
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| A Relay-Rover Differential Game |
JUN 2011 |
162 pages |
| Authors:
Youngdong Choi; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Guidance laws are developed to optimally position a relay Micro-UAV (MAV) to provide an operator at the base with real-time Intelligence, Surveillance, and Reconnaissance (ISR) by relaying communication and video signals when the rover MAV performing the ISR mission is out of radio contact range with the base. The ISR system is comprised of two MAVs, the Relay and the Rover, and a Base. The Relay strives to minimize the ... |
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| Numerical Investigation of Serpentine Plasma Actuators for Separation Control at Low Reynolds Number |
Jun 2011 |
17 pages |
| Authors:
Mark Riherd; Subrata Roy; Miguel Visbal; FLORIDA UNIV GAINESVILLE DEPT OF MECHANICAL ENGINEERING
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| Dielectric Barrier Discharge (DBD) plasma actuators with serpentine shaped electrodes cause a change in the operational behavior of the flow control mechanism relative to the standard linear actuator due to the introduction of fully three dimensional vortices. A parametric study is performed on a partially separated transitional flow over an SD7003 airfoil. This study examines the change in behavior as a function of geometric parameters, in particular the geometric amplitude ... |
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| Plasma Diagnostics with a High Aspect Ratio Cylindrical Probe Used as an Impedance Probe |
27 MAY 2011 |
19 pages |
| Authors:
D. N. Walker; R. F. Fernsler; D. D. Blackwell; W. E. Amatucci; NAVAL RESEARCH LAB WASHINGTON DC CHARGED PARTICLE PHYSICS BRANCH
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| Using a network analyzer to supply a driving rf signal to varying sizes of spherical probes in plasma, we have performed plasma diagnostics using theory based on an assumption of a thin sheath and a collisionless plasma. The rf signal applied to the probe by the network analyzer is small in magnitude compared to probe bias voltages and the instrument returns both real and imaginary parts of the complex plasma ... |
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GEOMETRY
