| Phase-Enhanced 3D Snapshot ISAR Imaging and Interferometric SAR |
28-Dec-2009 |
|
| Authors:
Joseph T Mayhan; MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
|
 | Previously, a novel formulation for the generation of three-dimensional (3D) inverse synthetic aperture radar (ISAR) images based on recent developments in high resolution spectral estimation theory was presented. Because this technique requires only snapshots of data, where a snapshot is defined as a block of Nyquist sampled frequency-time pulses of data, we refer to it as 3D snapshot imaging. Concomitant with these results, recent advances in interferometric SAR imaging have ... |
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| The Automatic Detection of Coronal Mass Ejections Using the Solar Mass Ejection Imager |
30-Oct-2009 |
17 pages |
| Authors:
Timothy A Howard; S J Tappin; Maxwell M Hampson; SOUTHWEST RESEARCH INST BOULDER CO
|
 | The most severe space weather is known to arise from large eruptions of plasma and magnetic field from the Sun. These eruptions, called Coronal Mass Ejections (CMEs), are an important mechanism in the evolution of the solar cycle. Because of their known association with geomagnetic storms and their resulting costly damage, there has been a large amount of resources dedicated in recent years to understanding these phenomena. In the present ... |
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| Development of a Relocatable Coastal Forecast System - Korean Coast Application |
09-Oct-2009 |
9 pages |
| Authors:
Cheryl A Blain; Yifei P Chu; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| The goal is to fulfill the US Navy's need for a relocatable, robust operational coastal forecast system by developing and transitioning a high-resolution, coastal circulation model into the Naval Oceanographic Office's operational environment. The coastal circulation model undergoing transition is a three-dimensional, finite-element based hydrodynamic model, the Advanced Circulation Model for Shelves, Coastal Seas, and Estuaries (ADCIRC). Its unstructured grid allows modeling complex coastal regions at fine spatial scale. Scripts ... |
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| Unified Regional Tomography and Source Moment Tensor Inversions Based on Finite-Difference Strain Green Tensor Databases |
30-Sep-2009 |
11 pages |
| Authors:
Wei Zhang; Xiaoping Yang; Yang Shen; Li Zhao; Zhigang Zhang; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
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| Seismic monitoring requires accurate source characterization in real time. Accurate 3D earth models are essential for accurate predictions of seismic observables and source characterization. While recovering the true earth structure has always been the goal of tomographic inversions, methods based on full wavefields in 3D reference models have several distinct advantages. Made possible by advances in high-performance computation, this full-wave approach accounts for complex wave propagation in 3D heterogeneous earth, ... |
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| Source and Path Calibration in Regions of Poor Crustal Propagation using Temporary, Large-Aperture, High-Resolution Seismic Arrays |
30-Sep-2009 |
9 pages |
| Authors:
John L Nabelek; Jochen Braunmiller; W S Phillips; OREGON STATE UNIV CORVALLIS
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| Broadband seismic data acquired during the Hi-CLIMB field experiment are used to study seismic events and path propagation in the Nepal Himalaya and south-central Tibetan Plateau. Similarities in regional propagation between Tibet and Iran motivate this new study. The 2002-2005 Hi-CLIMB experiment consisted of 233 stations distributed along a dense 800 km linear north-south array extending from the Himalayan foreland into the central Tibetan Plateau. The main array was flanked ... |
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| Estimating the Uncertainty and Predictive Capabilities of Three-Dimensional Earth Models |
30-Sep-2009 |
11 pages |
| Authors:
Stephen C Myers; Delaine T Reiter; William L Rodi; WESTON GEOPHYSICAL LEXINGTON MA
|
| Many three-dimensional models of seismic velocity structure in Eurasia have been developed in recent years by the seismic nuclear monitoring community. Most of these models are not accompanied by quantitative estimates of uncertainty, either in the model velocities themselves or in geophysical observables predicted by the models (e.g., body-wave travel times). Moreover, the various 3D models produced by these studies have not been compared to one another for their predictive ... |
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| Digital Control of Exchange Interaction in a Spin-based Silicon Quantum Computer |
07-Sep-2009 |
5 pages |
| Authors:
James C Sturm; Leonid P Rokhinson; PURDUE UNIV LAFAYETTE IN
|
| The objective of the proposed work was to demonstrate that digital switching of the exchange interaction by real space electron transfer will provide a viable method for accurate control of inter-qubit interactions. In order to fix the strength of the exchange interaction at the fabrication stage we proposed a new technology for 3D confinement of electrons by abrupt epitaxial Si/SiGe interface. During the course of the project we developed CVD ... |
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| Simulating Full-Waveform LIDAR |
Sep-2009 |
126 pages |
| Authors:
Angela M Kim; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| LIDAR (LIght Detection And Ranging) is used to remotely measure the three-dimensional shapes and arrangements of objects with high efficiency and accuracy by making precise measurements of time-of-flight of pulses of light. Discrete return LIDAR systems provide a discrete series of elevation points corresponding to reflections from objects in the scene. Full-waveform LIDAR systems measure the intensity of light returned to the sensor continuously over a period of time. Relatively ... |
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| Three Dimensional Imaging of Helicon Wave Fields Via Magnetic Induction Probes |
13-Jul-2009 |
222 pages |
| Authors:
Michael P Reilly; ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA
|
| The majority of data presented in this work is for a helicon plasma discharge driven at 13.56 MHz, 500 Watts input power, 900 Gauss applied magnetic field, 10 mTorr neutral Argon gas, and cylindrical plasma of 5 cm diameter approximately 50 cm long. High frequency magnetic induction probes were developed to measure helicon wave propagation using a new technique for frequency calibration through an impedance analyzer; up to 100 MHz. ... |
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| PSPP: A Protein Structure Prediction Pipeline for Computing Clusters |
Jul-2009 |
10 pages |
| Authors:
Jaques Reifman; Nela Zavaljevski; Anders Wallqvist; In-Chul Yeh; Valmik Desai; Michael S Lee; Rajkumar Bondugula; ARMY MEDICAL RESEARCH AND MATERIEL COMMAND FORT DETRICK MD
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| Background: Protein structures are critical for understanding the mechanisms of biological systems and, subsequently, for drug and vaccine design. Unfortunately, protein sequence data exceed structural data by a factor of more than 200 to 1. This gap can be partially filled by using computational protein structure prediction. While structure prediction Web servers are a notable option, they often restrict the number of sequence queries and/or provide a limited set of ... |
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| Google Pilot/WEdge Viewer |
Jul-2009 |
12 pages |
| Authors:
Andrew Berry; AIR FORCE ACADEMY COLORADO SPRINGS CO INST FOR INFORMATION TECHNOLOGY APPLICATIONS
|
| This paper summarizes the activity of USAF Academy cadet work on the Google Earth project for the CS 453/454 capstone course. The Google Pilot cadet project was a computer science 453/454 year long capstone project. Lt Col Berry led the students in their creation of a formalized system realized by Capt Jacobson a C-17 pilot. This project was demonstrated to leadership in the Air Force and was selected to be ... |
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| An Efficient and Effective Implementation of the Trust System for Power Grid Compartmentalization |
Jun-2009 |
138 pages |
| Authors:
Carlos; Juan M Gonzalez; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT
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| The goal of this research is to show in a simulated environment that security of the network can be strengthened by first fielding the trust system and second, by dividing a network into smaller clusters, called domains, in order to isolate anomalies or intrusions detected. In order to show this, a mathematical model of the problem will be built and translated into a software tool that at the end will ... |
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| Gravitational and Magnetic Anomaly Inversion Using a Tree-Based Geometry Representation |
Jun-2009 |
24 pages |
| Authors:
George A Gazonas; Raymond A Wildman; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| Gravitational and magnetic anomaly inversion of homogeneous 2D and 3D structures is treated using a geometric parameterization that can represent multiple, arbitrary polygons or polyhedra and a local-optimization scheme based on a hill-climbing method. This geometry representation uses a tree data structure, which defines a set of Boolean operations performed on convex polygons. A variable-length list of points, whose convex hull defines a convex polygon operand, resides in each leaf ... |
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| Application of the Backward-Smoothing Extended Kalman Filter to Attitude Estimation and Prediction using Radar Observations |
Jun-2009 |
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| Authors:
Kyle C Volpe; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| The Lincoln Attitude Estimation System (LAES), a new tool being developed for the Space Situational Awareness Group (SSAG) at MIT Lincoln Laboratory, integrates several existing hardware and software systems, with a backward-smoothing extended Kalman filter (BSEKF). LAES is intended to determine the rotational motion of a freely tumbling spacecraft from a sequence of discrete-time radar images. The raw range-Doppler returns are collected using a ground-based sensor, which is owned and ... |
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| Development of Two-Axial Bow-Tie Atom Trap with Near-Field Light |
28-Apr-2009 |
8 pages |
| Authors:
Ito Haruhiko; TOKYO INST OF TECH (JAPAN) DEPT OF PHYSICS
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| We developed a cross-shaped structure with a multilayer film for the 3D atom trap. The spatial profile of near-field light produced in the center gap was obtained from the finite difference time domain simulations, and the trap potential for a single Rb atom was also calculated. Based on the results, we determined the angle of slope, the radius of curvature of edges in the center, the thickness of each layer, ... |
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| Through-Thickness Property Measurement of Three-Dimensional Textile Composites |
Apr-2009 |
22 pages |
| Authors:
Paul Moy; Ryan L Karkkainen; Jerome T Tzeng; OAK RIDGE INST FOR SCIENCE AND EDUCATION TN
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| Three-dimensional (3-D) reinforcement of thick composite parts is utilized to increase delamination resistance and through-thickness properties, which often represent the weak link of such structures. Stitching, z-pinning, or a 3-D textile weave may be employed. In the current study of a 3-D, orthogonal-woven, glass-epoxy composite, a specimen is designed for cases in which a sufficiently thick specimen for standard test setups cannot be created due to manufacturing limitations. A minimum ... |
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| Anthropometric Survey (ANSUR) II Pilot Study: Methods and Summary Statistics |
Apr-2009 |
96 pages |
| Authors:
Steve Paquette; Claire Gordon; Bruce Bradtmiller; ANTHROTECH YELLOW SPRINGS OH
|
| Virtually every Army materiel system in use was designed and/or sized using a database of anthropometric information that is 20 years old. It was based on the Army Anthropometric Survey (ANSUR), which was conducted in 1988 on only Active Duty Soldiers. However, more than one-half of today's fighting forces are National Guard and Reserve component troops. A pilot study (ANSUR II) was recently undertaken to (1) assess anthropometric change since ... |
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| An Extensive X-ray Computed Tomography Evaluation of a Fully Penetrated Encapsulated SiC MMC Ballistic Panel |
Apr-2009 |
20 pages |
| Authors:
William H Green; Robert H Carter; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| X-ray computed tomography (XCT) is an important nondestructive evaluation technique for revealing the spatial distribution of ballistically induced damage in ceramics. The level of detection and resolution of damage depends on the size of the sample and the parameters of the XCT approach (e.g., focal spot size, magnification, etc.). Previous and ongoing work in this area includes assessment of ballistically induced damage in both individual ceramic targets and ceramic armor ... |
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| Extreme Scalability: Designing Interfaces and Algorithms for Soldier-Robotic Swarm Interaction |
Apr-2009 |
20 pages |
| Authors:
MaryAnne Fields; Susan Hill; Christopher Stachowiak; Ellen Haas; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| In theory, autonomous robotic swarms can be used for critical Army tasks (i.e., accompanying convoys); however, the Soldier controlling the swarm must be able to monitor swarm status and correct actions, especially in disrupted or degraded conditions. For this two-year Director's Research Initiative (DRI), we designed metacognition algorithms and Soldier-swarm display concepts to allow Soldiers to efficiently interact with a robotic swarm participating in a representative convoy mission. We used ... |
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| Comparative Evaluation of Display Technologies for Collaborative Design Review |
Apr-2009 |
|
| Authors:
Lochlan Magee; Ming Hou; Andrea Scipione; Mike Greenley; Justin G Hollands; DEFENCE RESEARCH AND DEVELOPMENT TORONTO (CANADA)
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| The effectiveness of five display technologies for supporting a collaborative workspace design review was compared. Participants searched for design flaws in a model of the front dashboard of a vehicle including an in-vehicle navigation system. The display types were 2D CRT, 3D CRT, 3D via Curved plasma display, a large DataWall display, and a cave automatic virtual environment (CAVE). Detection accuracy, time, and usability measures were obtained. The results indicated ... |
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| Normalized Implicit Radial Models for Scattered Point Cloud Data without Normal Vectors |
23-Mar-2009 |
18 pages |
| Authors:
Gregory M Nielson; ARIZONA STATE UNIV TEMPE
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| We describe some new methods for obtaining a mathematical representation of a surface that approximates a scattered point cloud, {(x y z ) i N} i i i , , = 1,L, without the use or need of normal vector data. The fitting surface is defined implicitly as the level set of a field function which is a linear combination of trivariate radial basis functions. Optimal approximations are based upon ... |
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| Direct Numerical Simulations of Diffusive Staircases in the Arctic |
Mar-2009 |
61 pages |
| Authors:
Gregory P Caro; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| The vertical transport of heat by the diffusive layer in the Arctic thermocline is a critical element of the high-latitude climate, and yet, after decades of research, the extant estimates remain highly controversial. Laboratory-based estimates of vertical heat fluxes originating from the thermohaline staircases of the thermocline are typically on the order of 0.1W/m2. This study suggests that these laboratory experiments underestimate the vertical heat fluxes and exceed their calculations ... |
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| Three-Dimensional Feature Reconstruction with Dual Forward Looking Sonars for Unmanned Underwater Vehicle Navigation |
Mar-2009 |
83 pages |
| Authors:
Nevin A McChesney; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Unmanned Underwater Vehicles frequently rely on two-dimensional sensors for information about their surroundings. These sensors do not provide adequate information for obstacle avoidance in cluttered maritime environments. To address that issue, a three-dimensional reconstruction of the environment utilizing occupancy grids and a prototype forward looking sonar will be considered. Providing the vehicle with three-dimensional views of the environment will allow for optimal route planning and an increase in successful missions ... |
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| Evolution of the gamma/gamma' Interface Width in a Commercial Nickel Base Superalloy Studied by 3D Atom Probe (Preprint) |
Mar-2009 |
15 pages |
| Authors:
J Tiley; J Y Hwang; R Banerjee; R Srinivasan; H L Fraser; S Nag; A R Singh; NORTH TEXAS STATE UNIV DENTON
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| The compositional width of the gamma/gamma-prime interface for primary and secondary gamma-prime precipitates in the commercial nickel base superalloy, Rene 88 DT, has been characterized at sub-nanometer resolution using local electrode atom probe (LEAP) tomography. On formation during continuous cooling, the primary gamma-prime precipitates exhibit a very sharp interface while the secondary gamma-prime precipitates exhibit a substantially more diffuse interface. Interestingly, on subsequent isothermal aging at 760 degrees C, the ... |
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| Algorithm Development for the Two-Fluid Plasma Model |
17-Feb-2009 |
19 pages |
| Authors:
Uri Shumlak; WASHINGTON UNIV SEATTLE AEROSPACE AND ENERGETICS RESEARCH PROGRAM
|
| A new algorithm is developed based on the two-fluid plasma model that is more physically accurate and capable than MHD models. The algorithm uses high-order spatial and temporal accuracy to simulate time-dependent, three-dimensional plasma phenomena. High-order spatial accuracy is accomplished using a discontinuous Galerkin finite element method that has provided up to 16th order accuracy. The temporal evolution is advanced using a 3rd order Runge-Kutta method. The numerical fluxes are ... |
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| Cooperative Wall-climbing Robots in 3D Environments for Surveillance and Target Tracking |
08-Feb-2009 |
20 pages |
| Authors:
Zhigang Zhu; Jizhong Xiao; CITY COLL OF THE CITY UNIV OF NEW YORK
|
| In the final reporting period, we have produced several variant wall-climbing robot prototypes for building inspection and window cleaning tasks. We also conducted theoretical research on multi-robot coordination, swarming robotics, and 3D map construction in constrained 3D space involving City-Climber robots. We have developed a 3D simulation software and conducted real experiments to verify the theoretical results. We are negotiating with Hasbro Inc. for licensing the City-Climber technology in toy ... |
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| Engineering Support / Corrosion Prevention and Control Evaluation |
05-Feb-2009 |
19 pages |
| Authors:
Don R Duran; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND REDSTONE ARSENAL AL
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| AIRCRAFT CORROSION: Corrosion Prevention and Control Evaluation * 3D Mapping * Pressure Washing. ENGINEERING SUPPORT: Maintenance Engineering Calls * Maintenance Engineering Order * Corrosion Prevention Techniques * ACE/Corrosion website. |
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| Aqueous Based Freeze-Form Extrusion Fabrication of Alumina Components (Preprint) |
Jan-2009 |
25 pages |
| Authors:
Tieshu Huang; Michael S Mason; Xiyue Zhao; Gregory E Hilmas; Ming C Leu; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| Fabricating ceramic materials into complex 3-D components is typically a complicated, costly, and time-consuming process that involves diamond machining to achieve its final shape. In most cases, the initial processing is powder-based, followed by densification (sintering) at elevated temperatures. Only a few circumstances, such as fuse casting and thermal spraying, can ceramics be directly fabricated into near net-shape, fully dense ceramic components. However, these techniques require an extremely high temperature ... |
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| Freeze-Spray Deposition of Layered Alumina/Zirconia Composites (Preprint) |
Jan-2009 |
22 pages |
| Authors:
Qiang Fu; Oratai Jongprateep; Ashlee Abbott; Faith Dogan; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
|
| A novel freeze-Spray Deposition (FSD) method is described for rapid fabrication of layered composites with controlled layer thickness and uniform microstructure. The graded alumina/zirconia composites are fabricated by freeze-spray deposition of ceramic slurries followed by freeze drying. Aqueous slurries with glycerol addition are sprayed on a cooled substrate using an automated 3-D gantry system. Processing parameters such as viscosity of the ceramic slurries, composition and thickness of deposited layers as ... |
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| Three-Dimensional Diffusion Simulation of Outer Radiation Belt Electrons During the 9 October 1990 Magnetic Storm |
Jan-2009 |
22 pages |
| Authors:
J M Albert; Nigel P Meredith; Richard B Horne; AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE
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| Relativistic (l MeV) electron flux increases in the Earth's radiation belts are significantly underestimated by models that only include transport and loss processes, suggesting that some additional acceleration process is required. Here we use a new, threedimensional code that includes radial diffusion and quasi-linear pitch angle and energy diffusion due to chorus waves, including cross terms, to simulate the 9 October 1990 magnetic storm. The diffusion coefficients are activity dependent, ... |
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| Prototype Sparse Arrays for 3D Sonar Imaging System |
Jan-2009 |
8 pages |
| Authors:
John Impagliazzo; Steven Kay; Alice M Chiang; Steven R Broadstone; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A three dimensional sonar imaging system is under development for use by Navy divers for mine-field reconnaissance and mine-hunting systems. These divers require a small, low power, lightweight acoustic imaging system with high resolution for examining and disposing of underwater ordinance. Sparse array technology is being investigated to develop a sonar requiring the minimal number of signal processing channels while maintaining the beamwidth and sidelobe structure required for high resolution ... |
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| An Investigation of a Gas Laser Pressure Recovery System Diffuser |
19-Dec-2008 |
10 pages |
| Authors:
Carrie A Noren; Theodore Ortiz; Michael Wilkinson; Wade Klennert; Timothy J Madden; Richard W Chan; H W Behrens; Robert Walter; AIR FORCE RESEARCH LAB KIRTLAND AFB NM DIRECTED ENERGY DIRECTORATE
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| A diffuser, with the purpose of efficiently recovering pressure from a gas laser system, was designed and studied. A diffuser, as part of a pressure recovery system, is used in a gas laser system to transition the laser cavity's low pressure to the ambient pressure outside the device. The diffuser studied here is made up of a constant-area supersonic section and a diverging subsonic section. The diffuser is studied experimentally ... |
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| Generalized Adaptive Radar Signal Processing |
Dec-2008 |
8 pages |
| Authors:
Paul D Mountcastle; Nathan A Goodman; Charles J Morgan; TECHNOLOGY SERVICE CORP TRUMBULL CT
|
| In this paper 1, the use of adaptive weights over the radar measurement dimensions of pulse time, antenna receive element, and wideband frequency is extended to cover a much broader range of radar detection problems than was supposed in the original formulation of spacetime adaptive signal processing (STAP). These problems include, among others (1) Adaptive beamforming in three dimensions; (2) Detection and 3D ISAR imaging of targets in general torque-free ... |
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| Estimating High-Resolution Directional Clutter Maps in Forested Terrain Using Airborne Lidar Data |
Dec-2008 |
9 pages |
| Authors:
K C Slatton; Pang-Wei Liu; Heezin Lee; Mike Campbell; FLORIDA UNIV GAINESVILLE DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
|
| A priori knowledge of clutter environments is critical for understanding target detection performance from airborne sensors and optimally predicting future performance to aid in mission planning. Modern airborne lidar, also known as Airborne Laser Swath Mapping (ALSM), systems can acquire decimeter scale measurements of the 3D structure in forests and urban areas. From these measurements, high resolution clutter maps that account for variations in both 3D Cartesian coordinates and viewing ... |
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| Graphical User Interface Version 2.8 with Fire and Smoke Simulation Model (FSSIM) Version 1.2: User Manual |
10-Oct-2008 |
79 pages |
| Authors:
Greg Henley; Robert Kirkland; Jason Floyd; Joseph Scheffey; Frederick W Williams; Tomasz A Haupt; Bhargavi S Parihar; Patricia A Tatem; MISSISSIPPI STATE UNIV MISSISSIPPI STATE CENTER FOR ADVANCED VEHICULAR SYSTEMS
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| The collaborative work of Hughes Associates, Inc. (HAI), the Naval Research Laboratory (NRL), and a group at Mississippi State University resulted in developing a simulation system including Graphical User Interface (GUI) and visualization. The simulation environment provides a runtime environment for a third-party simulation package currently, FSSIM developed by HAI. This updated user's manual for the viewer provides documentation of the GUI layout and detailed discussion of features of the ... |
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| Automation and Preclinical Evaluation of a Dedicated Emission Mammotomography System for Fully 3-D Molecular Breast Imaging |
Oct-2008 |
24 pages |
| Authors:
Spencer J Cutler; DUKE UNIV DURHAM NC
|
| The overall objective of this proposal is to fully automate and optimize the performance of a 3-D dedicated emission mammotomography system for enhanced semi-automated clinical testing. In the second year of study, automated laser-guided contouring hardware and software were successfully implemented, and a final design is in progress. An observer-based direct comparison of 3D dedicated SPECT and 2D planar scintimammography was also conducted. Measuring estimated volumes by voxel integration of ... |
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| Bio/Nano Electronic Devices and Sensors |
Oct-2008 |
11 pages |
| Authors:
W K Jones; FLORIDA INTERNATIONAL UNIV MIAMI DIV OF SPONSORED RESEARCH AND TRAINING
|
| This effort consists of five research thrusts: (1) Dense Memory Devices-(1)3-D magnetic recording was enhanced using patterned soft underlayers and interlayer, (2) Cold cathode microwave generator and ceramic electron multiplier-ceramic multiplier using a novel secondary electron yield materials of MgO and CNT was demonstrated as well as cooling structures based on capillary cooling.(3) CNT-based Bio-nano Sensor single walled CNT structures with FIB generated nanogaps have been used to probe single ... |
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| Initial Steps Toward Next-Generation, Waveform-Based, Three-Dimensional Models and Metrics to Improve Nuclear Explosion Monitoring in the Middle East |
30-Sep-2008 |
8 pages |
| Authors:
Brian Savage; Arthur J Rodgers; Jeroen Tromp; Brian Covellone; RHODE ISLAND UNIV KINGSTON
|
| In an effort toward improving current seismic-velocity models for the Middle East, the initial Step of building a high-quality database of recordings from well characterized sources is essential. This high-quality database of recordings, or broadband waveforms, encompassing the region from the Mediterranean to the eastern edge of Tibet, will be the primary measure for evaluation and improvement in the iterative, waveform-based, adjoint-inversion process. Adjoint inversions, as with any waveform-based method, ... |
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| Wave Propagation from Complex 3D Sources Using the Representation Theorem |
30-Sep-2008 |
11 pages |
| Authors:
Heming Xu; Jeffry L Stevens; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
|
| In spite of extensive prior research on the generation of seismic waves by underground nuclear explosions, it is still not possible to provide a complete explanation for the observed wavefields, particularly at regional distances. Spherically symmetric explosion models embedded in layered elastic media effectively model the P phases generated by explosions and the major characteristics of some reflected and transmitted phases. Nonlinear axisymmetric finite difference calculations of explosions, including gravity ... |
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| Finite-Frequency Seismic Tomography of Body Waves and Surface Waves from Ambient Seismic Noise: Crustal and Mantle Structure Beneath Eastern Eurasia |
30-Sep-2008 |
11 pages |
| Authors:
Wei Zhang; Xiaoping Yang; Yong Ren; Ting Yang; Yang Shen; SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
|
| To improve seismic calibration for nuclear explosion monitoring, we use 3D sensitivity kernels of finite-frequency body and surface waves to develop models of the crustal and mantle structures beneath eastern Eurasia. We have collected and processed available broadband data from both permanent stations and temporary networks in eastern Eurasia. We obtained a regional P-wave velocity model for the mantle structures down to 1,500 km beneath the eastern Eurasia. We also ... |
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| Biotic - Abiotic Interface Between they Body and the Artificial Limb |
29-Sep-2008 |
29 pages |
| Authors:
Kenneth H Church; SCIPERIO INC ORLANDO FL
|
| Intraosseous transcutaneous amputation prostheses (ITAPs) may be able to overcome the problems that stem from the nonuniform distribution of pressure seen in the conventional stump-socket prosthetic replacement devices. While transcutaneous devices have had limited success in amputees. By optimizing the attachment of the skin to the prosthetic, ITAPs may become clinically viable options. Our team has developed a modified titanium construct with a specially machined surface to increase the adherence ... |
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| Acoustic Scattering from Sand Dollars (Dendraster excentricus): Modeling as High Aspect Ratio Oblate Objects and Comparison to Experiment |
Sep-2008 |
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| Authors:
Gregory C Dietzen; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| Benthic shells can contribute greatly to the scattering variability of the ocean bottom, particularly at low grazing angles. Among the effects of shell aggregates are increased scattering strength and potential subcritical angle penetration of the seafloor. Sand dollars (Dendraster excentricus) occur commonly in the ocean and have been shown to be significant scatters of sound. In order to understand more fully the scattering mechanisms of these organisms, the scattering from ... |
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| Characteristics of Surface-Normal Fano Filters on Flexible Plastic Substrates |
Aug-2008 |
4 pages |
| Authors:
Zexuan Qiang; Weidong Zhou; Zhenqiang Ma; Hongjun Yang; Li Chen; Huiqing Pang; Gail J Brown; TEXAS UNIV AT ARLINGTON NANOFAB CENTER
|
| We report here the angular and polarization dependent transmission characteristics of surface-normal optical filters based on Fano resonances on patterned single crystalline silicon nanomembranes (SiNM), which were fabricated and transferred onto transparent PET plastic substrates using a disruptive SiNM wet transfer process. The measured surface-normal and angle-dependent filter transmission results agree well with the design and simulation based on 3D finite-difference time-domain technique. |
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| Bio-Nanotechnology Infrastructure and Technology Oriented Research |
17-Jul-2008 |
14 pages |
| Authors:
W K Jones; FLORIDA INTERNATIONAL UNIV MIAMI ADVANCED MATERIALS ENGINEERING RESEARCH INST (AMERI)
|
| FIU research concentrated in the following areas of development: nanoelectronics, bio-nanosensors, and nanomaterials, processes, and characterization. Five projects were supported: next generation information storage devices-both three-dimensional magnetic and protein-based, high power cold cathodes for microwave generators, carbon nanotube-based bio-sensors, silicon/polymer nanophotonics, and doped nanodiamonds and nanoceramic lasers for future devices. In magnetic storage devices, this work has resulted in patterned soft underlayer metallizations to localize the recording and sensitivity fields ... |
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| Holographically Fabricated Photonic Crystals with Large Reflectance |
16-Jul-2008 |
5 pages |
| Authors:
Y C Chen; Geddes; J B III; J T Lee; P V Braun; P Wiltzius; ILLINOIS UNIV AT URBANA-CHAMAPIGN
|
| We report reflection and transmission spectra from three-dimensional polymer photonic crystals fabricated by holographic lithography. The measured peak reflectance matches that predicted by both a finite-difference time-domain method a simple transfer matrix theory and is 70%, significantly higher than previous reports of 30% reflectance. |
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| Understanding/Modelling of Thermal and Radiation Benefits of Quantum Dot Solar Cells |
11-Jul-2008 |
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| Authors:
Ryne P Raffaelle; ROCHESTER INST OF TECH NY
|
| The radiation and thermal dependence of strain compensated InAs QD/ GaAs solar cells have been investigated. Strain compensation is a key step in realizing high efficiency quantum dots solar cells (QDSC). InAs quantum dots (QDs) are grown using the Stranski-Krastenov growth mode which relies on strain, resulting from the mismatch between the InAs and the GaAs lattice parameters, to initiate three-dimensional growth. The generation of QDs does reduce the local ... |
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| Atomic Scale Structure and Chemical Composition Across Order-Disorder Interfaces (POSTPRINT) |
Jul-2008 |
6 pages |
| Authors:
J Tiley; J Y Hwang; R Banerjee; R Srinivasan; G B Viswanathan; H L Fraser; D M Dimiduk; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
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| The high strength of many metallic alloys, especially at elevated temperatures, including nickel base superalloys used in aircraft jet engines, is often attributed to the presence of homogeneously distributed second phase precipitates within a disordered matrix. In superalloys, the ordered precipitate/disordered matrix interface plays a critical role in determining the precipitate coarsening kinetics as well as the strengthening mechanism at high temperatures. Combining aberration-corrected high resolution scanning transmission electron microscopy ... |
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| Response of an Acoustic Coating on a Rib-Stiffened Plate |
06-Jun-2008 |
45 pages |
| Authors:
Andrew J Hull; John R Welch; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
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| This report develops an analytical model of a fluid-loaded acoustic coating affixed to a rib-stiffened plate. The model is three-dimensional and has fully-elastic behavior. The system is loaded by a plane wave that is harmonic both spatially and temporally. The model begins with Naviers' equations of motion of an elastic solid, which produces unknown displacement fields that are inserted in to stress equations at the boundaries of the plate and ... |
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| Solving Multi-Dimensional Problems of Gas Dynamics Using MATLAB |
01-Jun-2008 |
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| Authors:
L K Antanovskii; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION EDINBURGH (AUSTRALIA) WEAPONS SYSTEMS DIV
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| This report describes and implementation of a Godunov-type solver for gas dynamics equations in MATLAB(trade name). The main attention is paid to providing a generic code that can be easily adapted to particular problems in one, two or three dimensions. This is achieved by employing a cell connectivity matrix thus allowing on to use various structured and unstructured meshes without modification of the core solver. The code has been thoroughly ... |
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| Turbulent Convection in an Anelastic Rotating Sphere: A Model for the Circulation on the Giant Planets |
01-Jun-2008 |
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| Authors:
Yohai Kaspi; WOODS HOLE OCEANOGRAPHIC INSTITUTION MA
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| This thesis studies the dynamics of a rotating compressible gas sphere, driven by internal convection, as a model for the dynamics on the giant planets. We develop a new general circulation model for the Jovian atmosphere, based on the MIT-gcm dynamical core augmenting the nonhydrostatic model. The grid extends deep into the planet's interior allowing the model to compute the dynamics of a whole sphere of gas rather than a ... |
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