| On the Renormalization of the Covariance Operators |
Feb 2012 |
14 pages |
| Authors:
Max Yaremchuk; Matthew Carrier; NAVAL RESEARCH LAB STENNIS DETACHMENT STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
 | Many background error correlation (BEC) models in data assimilation are formulated in terms of a smoothing operator B, which simulates the action of the correlation matrix on a state vector normalized by respective BE variances. Under such formulation, B has to have a unit diagonal and requires appropriate renormalization by rescaling. The exact computation of the rescaling factors (diagonal elements of B) is a computationally expensive procedure, which needs an ... |
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| Comparing Advertised Ballistic Coefficients with Independent Measurements |
17 Jan 2012 |
12 pages |
| Authors:
Emily Bohnenkamp; Bradford Hackert; Maurice Motley; Michael Courtney; AIR FORCE ACADEMY COLORADO SPRINGS CO
|
| This report addresses the question of ballistic coefficient accuracy. Ballistic coefficients of bullets are important because under or over estimates of ballistic coefficients can dramatically impact predictions of long range trajectory, wind drift, and impact energy. This project compares ballistic coefficients advertised by four well-known bullet companies (Hornady, Nosler, Sierra, and Barnes) with those measured by an independent source (Bryan Litz). G1 and G7 ballistic coefficients were determined using calculations ... |
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| More Inaccurate Specifications of Ballistic Coefficients |
02 Jan 2012 |
8 pages |
| Authors:
Alex Halloran; Colton Huntsman; Chad Demers; Michael Courtney; AIR FORCE ACADEMY COLORADO SPRINGS CO
|
| A ballistic coefficient (BC) can be determined by using two chronographs a measured distance away from each other and shooting a bullet so the velocity is measured by the two devices. Ballistic modeling software requires accurate measurement of ballistic coefficients to accurately predict downrange trajectories, wind drift, and retained energy. This article presents new measurements for 21 different bullets and shows that BCs can differ significantly from the claims of ... |
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| Algorithm for Triangulating Visual Landmarks and Determining Their Covariance |
01 Jan 2012 |
40 pages |
| Authors:
Justin Gorgen; Lee LeMay; SPACE AND NAVAL WARFARE SYSTEMS CENTER SAN DIEGO CA
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| We present a least squares method for triangulating a landmark location given the bearing towards it from two known locations. For the three-dimentional case, this method is shown to be equivalent to finding the mid-point method of triangulation. This method is then extended to triangulating three-dimensional coordinates for viual landmark from two calibrated images of the landmark taken from known camera locations. Triangulation error and error covariance is estimated by ... |
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| Defense Health: Coordinating Authority Needed for Psychological Health and Traumatic Brain Injury Activities |
Jan 2012 |
59 pages |
| Authors:
GOVERNMENT ACCOUNTABILITY OFFICE WASHINGTON DC
|
| Post-traumatic stress disorder (PTSD), which falls into the broader field of psychological health (PH), and traumatic brain injury (TBI) are recognized as the signature wounds of the wars in Afghanistan and Iraq. In two reports issued in 2011 (GAO-11-219 and GAO-11-611), GAO cited numerous management weaknesses at the Defense Center of Excellence for PH and TBI (DCOE). For the present report, GAO reviewed (1) funding for DOD's PH and TBI ... |
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| Simulating the Mechanical Response of Titanium Alloys Through the Crystal Plasticity Finite Element Analysis of Image-Based Synthetic Microstructures |
Jan 2012 |
103 pages |
| Authors:
Josh Thomas; OHIO STATE UNIV COLUMBUS
|
| Micromechanical crystal plasticity finite element simulations of the response of synthetic titanium microstructures are carried out with the goal of quantifying the effect of microstructure on mechanical properties. Two separate materials are studied: (1) an alpha-Beta Ti-6Al-4V material and (2) a highly-textured, rolled lpha Ti-3Al-2.5V sheet material. Performing accurate finite element analyses begins with accurate image-based characterization of the morphological and crystallographic features of the materials at the microstructural scale. ... |
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| Face Recognition Performance: Role of Demographic Information |
Jan 2012 |
15 pages |
| Authors:
Brendan F Klare; Mark J Burge; Joshua C Klontz; Richard W Vorder Bruegge; Anil K Jain; MITRE CORP MCLEAN VA
|
| This paper studies the influence of demographics on the performance of face recognition algorithms. The recognition accuracies of six different face recognition algorithms (three commercial, two non-trainable, and one trainable) are computed on a large scale gallery that is partitioned so that each partition consists entirely of specific demographic cohorts. Eight total cohorts are isolated based on gender (male and female) race/ethnicity (Black, White, and Hispanic), and age group (18 ... |
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| Improving Counterinsurgency Campaign Assessment: The Importance of Transparency in the Fog of War |
Jan 2012 |
4 pages |
| Authors:
RAND NATIONAL DEFENSE RESEARCH INST SANTA MONICA CA
|
| Military campaign assessments are a cornerstone of sound strategic decision making. A RAND study examined the process and methods used to assess the progress of counterinsurgency (COIN) campaigns in an effort to inform ongoing assessments of operations in Afghanistan and, ultimately, contribute to improvements in military doctrine. Beginning in late 2011 -- after the study had concluded -- the International Security Assistance Force (ISAF) in Afghanistan began developing and implementing ... |
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| On the Performance Evaluation of Query-Based Wireless Sensor Networks |
Jan 2012 |
34 pages |
| Authors:
Guvenc Degirmenci; Jeffrey P Kharoufeh; Rusty O Baldwin; PITTSBURGH UNIV PA DEPT OF INDUSTRIAL ENGINEERING
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| We present a queueing-theoretic framework to evaluate the performance of large-scale, querybased wireless sensor networks whose nodes detect and advertise significant events that are useful for only a limited time; queries generated by the nodes of the network are also time-limited. The main performance parameter is the steady state proportion of generated queries that fail to be answered on time. Using an infinite transmission range model, we first provide an ... |
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| A Mass Conservation Algorithm for Adaptive Unrefinement Meshes Used by Finite Element Methods |
Jan 2012 |
12 pages |
| Authors:
Hung V Nguyen; Jing-Ru C Cheng; Charlie R Berger; Gaurav Savant; ARMY EDGEWOOD RESEARCH DEVELOPMENT AND ENGINEERING CENTER APG MD
|
| The Adaptive Hydraulics (ADH) model is an adaptive finite element method to simulate three-dimensional Navier-Stokes flow, unsaturated and saturated groundwater flow, overland flow, and two- or three-dimensional shallow-water flow and transport. In the shallow-water flow and transport, especially involving multispecies transport, the water depth (h), the product of water depth and velocities (uh and vh), as well as water depth and chemical concentration (hc) are dependent variables of fluid-motion simulations ... |
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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
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| 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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| Performance Characterization and Optimization of Microgrid-Based Energy Generation and Storage Technologies |
Jan 2012 |
154 pages |
| Authors:
II Guggenberger Joe D; MISSOURI UNIV OF SCIENCE AND TECHNOLOGY ROLLA
|
| Renewable energy-powered microgrids have proven to be a valuable technology for self-contained (off-grid) energy systems. Characterizing microgrid system performance pre-deployment would allow the system to be appropriately sized to meet all required electrical loads at a given renewable source operational time frequency. A vanadium redox battery was empirically characterized to determine operating efficiency as a function of charging characteristics and parasitic load losses. A model was developed to iteratively determine ... |
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| Remote Environmental Monitoring and Diagnostics in the Perishables Supply Chain - Phase 1 |
12 Dec 2011 |
210 pages |
| Authors:
Jeffrey K Brecht; Jean-Pierre Emond; Maria C Nunes; Charles A Sims; Asli Obadasi; Ismail Uysal; FLORIDA UNIV GAINESVILLE
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| This report details the Phase 1 effort conducted by the University of Florida and the University of South Florida Polytechnic as part of a multi-year, multi-phase effort entitled Remote Environmental Monitoring and Diagnostics in the Perishables Supply Chain. This work was conducted during the period October 2008 to December 2010 and involved the investigation and application of various technologies including wireless temperature sensors, remote monitoring using radio frequency identification (RFID), ... |
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| Report on Quality Control Review of Grant Thornton, LLP FY 2009 Single Audit of Concurrent Technologies Corporation |
05 Dec 2011 |
17 pages |
| Authors:
Randolph R Stone; Carolyn R Davis; DEPARTMENT OF DEFENSE ALEXANDRIA VA OFFICE OF THE INSPECTOR GENERAL
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| As the cognizant federal agency for Concurrent Technologies Corporation (Concurrent Technologies), we performed a review of the Grant Thornton, LLP single audit and supporting working papers for fiscal year ended June 30, 2009. The purpose of our review was to determine whether the audit was conducted in accordance with auditing standards and the auditing and reporting requirements of Office of Management and Budget Circular A-133, Audits of States, Local Governments, ... |
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| Deficiencies in Journal Vouchers that Affected the FY 2009 Air Force General Fund Statement of Budgetary Resources |
01 Dec 2011 |
56 pages |
| Authors:
Amy J Frontz; Mark Starinsky; DEPARTMENT OF DEFENSE ALEXANDRIA VA OFFICE OF THE INSPECTOR GENERAL
|
| During FY 2009, Defense Finance and Accounting Service, Columbus (DFAS Columbus), accountants prepared 6,117 journal vouchers, amounting to approximately $2 trillion, to produce the Air Force General Fund Statement of Budgetary Resources (SBR) and other budgetary reports showing the sources and status of $201.6 billion of available general funds. Our objective was to review the journal vouchers DFAS prepared and used to produce the FY 2009 Air Force General Fund ... |
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| Constant False Alarm Rate (CFAR) Autotrend Evaluation Report |
Dec 2011 |
35 pages |
| Authors:
Daniel Wade; Kenneth Pipe; Steve Krick; ARMY MISSILE RESEARCH DEVELOPMENT AND ENGINEERING CENTER REDSTONE ARSENAL AL
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| A collaborative program was successfully conducted by Humaware and the Aviation and Missile Research, Development, and Engineering Center (AMRDEC) (managed by U.S. Army International Technology Center- Atlantic (USAITC-A)) between October 2010 and February 2011 to assess the performance of the Constant False Alarm Rate (CFAR) Autotrend dynamic alert detection technology as an augmentation to the Apache Modernized Signal Processor Unit (MSPU) fault detection technology. After an initial setup and optimization ... |
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| Development of Methodology to Classify Historical Panchromatic Aerial Photography. Analysis of Landscape Features on Point Au Fer Island, Louisiana - from 1956 to 2009: A Case Study |
Dec 2011 |
43 pages |
| Authors:
Glenn M Suir; Christina L Saltus; James B Johnston; John A Barras; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
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| Recent studies of coastal Louisiana landscapes have shown an increased connection between historical episodic events and current landscape condition. Therefore, the importance of historical landscape reconstruction through the interpretation of panchromatic aerial photo-graphy has increased because it provides synoptic views of hydrology, vegetation, and ecosystems for time periods when data options are limited. Though panchromatic aerial photographs provide a valuable historical record of past landscape conditions, their use is limited ... |
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| Monitoring Tissue Ischemia After Potentially Life Threatening Post-Traumatic Injuries |
Dec 2011 |
11 pages |
| Authors:
Wanchun Tang; INSTITUTE OF CRITICAL CARE MEDICINE PALM SPRINGS CA
|
| Hemorrhagic shock remains the dominant cause of death after both battlefield and civilian trauma. The conventional management of fluid resuscitation titrated to normal levels of blood pressure may increase mortality. Fluid resuscitation during hemorrhagic shock is therefore best based on more specific measurements indicating adequacy or inadequacy of tissue perfusion rather than on arterial (blood) pressure levels. This research sought to develop and optimize a nanosensor as a monitoring device ... |
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| Enhancing the Enhanced Scenario-Based Method of Cost Risk Analysis |
Dec 2011 |
51 pages |
| Authors:
Seth T Hooper; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
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| The current S-Curve method of cost risk analysis for major Department of the Navy (DON) acquisition projects does not accurately estimate actual cost when the program reaches Full Rate Production. Another sometimes more effective method of measuring cost risk is by using the enhanced scenario-based method (eSBM) of risk analysis. The reason that cost estimations from the milestone B costs are inaccurate is that very little, if any, real information ... |
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| Analyzing Commodity Council Development and Implementation: The Air Force Furnishings Commodity Council |
Dec 2011 |
167 pages |
| Authors:
Michael A Mealiff; Neal D Wall; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This study seeks to understand the factors that contributed to the successful development and implementation of the Air Force Furnishings Commodity Council (AFFCC). Specifically, we explore the challenges associated with supporting small business goals without sacrificing strategic outcomes, the difficulties of standing up a commodity council whose spend has no functional ownership or centralized funding, and the complexities of establishing accurate cost savings performance and validation metrics. We also explore ... |
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| Analysis of Historical Materiel Return Program (MRP) Credits at the 1st Marine Logistics Group Reparable Issue Point (RIP) |
Dec 2011 |
113 pages |
| Authors:
Edward M Caricato; John D Draper; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Materiel Returns Program (MRP) credits have increased 1st Marine Logistics Group's (1st MLG) total obligation authority by an average of 27% annually since 2008. However, 1st MLG has been unable to leverage the MRP in budget execution due to an inability to forecast future credits. The purpose of this research is to determine whether analysis of historical MRP credits at 1st MLG could enable the comptroller to forecast future credits, ... |
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| Aerodynamic Validation of Emerging Projectile Configurations |
Dec 2011 |
103 pages |
| Authors:
Sor W Lun; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Ever-increasing demands for accuracy and range in modern warfare have expedited the optimization of projectile design. The crux of projectile design lies in the understanding of its aerodynamic properties early in the design phase. This research first investigated the aerodynamic properties of a standard M549, 155mm projectile. The transonic speed region was the focus of the research as significant aerodynamic variation occurs within this particular region. Aerodynamic data from wind ... |
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| Free-Electron Laser (FEL) Utilization in Space Applications (Ship-Borne Pointing Accuracy, Deep-Space Communications, and Orbital Debris Tracking) |
Dec 2011 |
137 pages |
| Authors:
Jason M Wittrock; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The U.S. Navy is currently conducting research which will support the production of a MW-class free-electron laser (FEL). The Navy's end-state goal is to design and implement a defense system capable of destroying a fast-flying, anti-ship cruise missile (ASCM) target. To this end, the necessity of ensuring accurate pointing control of the beam is required. The first part of this thesis focuses on the U.S. Navy's desired end-state and investigates ... |
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| A Miniature Wide Band Atomic Magnetometer |
Dec 2011 |
84 pages |
| Authors:
Mark Prouty; GEOMETRICS INC CAMBRIDGE MA
|
| Magnetometers and electromagnetic (EM) devices are two of the most commonly used instruments for searching for UXO. Research in this area has progressed from the problem of detecting possible UXO items to that of discriminating between hazardous and non-hazardous underground objects. Accurate identification of underground items requires that as much information as possible be gathered about the anomaly. This includes taking a dense array of magnetometer readings as well as ... |
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| Air Force Can Improve Controls Over Base Retail Inventory |
23 Nov 2011 |
59 pages |
| Authors:
Amy J Frontz; DEPARTMENT OF DEFENSE ALEXANDRIA VA OFFICE OF THE INSPECTOR GENERAL
|
| We evaluated the controls over Air Force base retail inventory stored at sites in the contiguous United States. Air Force retail inventory records were generally accurate at 71 bases but personnel can make improvements. Specifically, system records for 44,155 of the 759,387 national stock numbers included in the inventory accuracy testing population had quantity discrepancies; and $5.2 billion of base retail inventory was misstated (overstated and understated) by $77.3 million. ... |
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| Management Improvements Needed in Commander's Emergency Response Program in Afghanistan |
21 Nov 2011 |
83 pages |
| Authors:
Patricia A Marsh; DEPARTMENT OF DEFENSE ALEXANDRIA VA OFFICE OF THE INSPECTOR GENERAL
|
| The objective of the audit was to determine whether controls over the Commander's Emergency Response Program (CERP) payments made to support Afghanistan operations were adequate. Specifically, we reviewed the controls to ensure that contract payments were proper and that complete, accurate, and meaningful data were reported to the decisionmakers responsible for managing CERP. U.S. Forces-Afghanistan (USFOR-A) processed more than 8,509 CERP payment transactions, totaling $486 million, between October 2008 and ... |
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| High Order Well-balanced WENO Scheme for the Gas Dynamics Equations under Gravitational Fields |
12 Nov 2011 |
27 pages |
| Authors:
Yulong Xing; Chi-Wang Shu; BROWN UNIV PROVIDENCE RI DIV OF APPLIED MATHEMATICS
|
| The gas dynamics equations, coupled with a static gravitational field, admit the hydrostatic balance where the flux produced by the pressure is exactly canceled by the gravitational source term. Many astrophysical problems involve the hydrodynamical evolution in a gravitational field, therefore it is essential to correctly capture the effect of gravitational force in the simulations. Improper treatment of the gravitational force can lead to a solution which either oscillates around ... |
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| Accuracy and Best Practices for Small-Scale Rocket Engine Testing |
10 Nov 2011 |
31 pages |
| Authors:
Malissa Lightfoot; Stephen A Danczyk; Jon Watts; S A Schumaker; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIR/SPACE AND MISSILE PROPULSION DIV
|
| An in-depth analysis of the uncertainties associated with small-scale rocket engine testing has been conducted. The analysis uses terminology and approaches detailed in the ISO 'Guide to the Expression of Uncertainty in Measurement' (GUM) and a recent NASA handbook on the subject (NASA HBK-8739.19-3). Along with this analysis, best practices for minimizing uncertainties are provided. AFRL's Experimental Cell-1 facility is used as the example engine, and the data values provided ... |
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| Analysis of Historical Materiel Return Program (MRP) Credits at the 1st Marine Logistics Group Reparable Issue Point (RIP) |
05 Nov 2011 |
116 pages |
| Authors:
Edward M Caricato; John D Draper; NAVAL POSTGRADUATE SCHOOL MONTEREY CA GRADUATE SCHOOL OF BUSINESS AND PUBLIC POLICY
|
| Materiel Returns Program (MRP) credits have increased 1st Marine Logistics Group's (1st MLG) total obligation authority by an average of 27% annually since 2008. However, 1st MLG has been unable to leverage the MRP in budget execution due to an inability to forecast future credits. The purpose of this research is to determine whether analysis of historical MRP credits at 1st MLG could enable the comptroller to forecast future credits ... |
|
| Implementation of ERDC HEP Geo-Material Model in CTH and Application |
02 Nov 2011 |
25 pages |
| Authors:
Ravi Thyagarajan; Richard Weed; Christoper Moore; MISSISSIPPI STATE UNIV MISSISSIPPI STATE CENTER FOR ADVANCED VEHICULAR SYSTEMS
|
| Work performed under TARDEC/MSU Simulation Based Reliability and Safety (SimBRS) Work Directive 37 - CTH Analysis Support and Code Enhancement TARDEC identified implementation of ERDC Hybrid Elastic-Plastic Geo-material model in CTH as a priority task Standard model at ERDC for soils (also rocks and concrete) Large library of HEP model fits for different soil types Proven to provide accurate model for buried explosions in soils in Lagrangian codes (EPIC, PRONTO3D, ... |
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| Experimental Testing of the Variable Rotated Elastic Parabolic Equation |
Nov 2011 |
7 pages |
| Authors:
Harry J Simpson; Jon M Collis; Raymond J Soukup; Michael D Collins; William L Siegmann; NAVAL RESEARCH LAB WASHINGTON DC PHYSICAL ACOUSTICS BRANCH
|
| A series of laboratory experiments was conducted to obtain high-quality data for acoustic propagation in shallow water waveguides with sloping elastic bottoms. Accurate modeling of transmission loss in these waveguides can be performed with the variable rotated parabolic equation method. Results from an earlier experiment with a flat or sloped slab of polyvinyl chloride (PVC) demonstrated the necessity of accounting for elasticity in the bottom and the ability of the ... |
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| Effectiveness of Systems Engineering (SE) Tailored for the Science & Technology (S&T) Environment: Improvement of USAF Airdrop Accuracy |
27 Oct 2011 |
35 pages |
| Authors:
Keith Bowman; Carol Ventresca; Robert McCarty; Stephanie Globus; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PLANS AND PROGRAMS DIRECTORATE
|
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| Next-Generation Parametric Reduced-Order Models |
24 Oct 2011 |
57 pages |
| Authors:
Sung-Kwon Hong; Bogdan I Epureanu; Matthew P Castanier; ARMY TANK AUTOMOTIVE RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| Novel parametric reduced-order models are proposed for fast reanalysis to predict the dynamic response of complex structures, which suffered thickness variations caused by design changes or damage in one or more substructures. Parametric reduced-order models developed previously have two important challenges to overcome to improve accuracy and performance: (a) the transformation matrix is not mathematically stable, (b) the Taylor series parameterization techniques do not capture thickness variations of the structure ... |
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| Accuracy and Best Practices for Small-Scale Rocket Engine Testing |
19 Oct 2011 |
48 pages |
| Authors:
M D Lightfoot; S A Danczyk; J M Watts; S A Schumaker; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| An in-depth analysis of the uncertainties associated with small-scale rocket engine testing has been conducted. The analysis uses terminology and approaches detailed in the ISO ?Guide to the Expression of Uncertainty in Measurement? (GUM) and a recent NASA handbook on the subject (NASA HBK-8739.19-3). Along with this analysis, best practices for minimizing uncertainties are provided. AFRL?s Experimental Cell-1 facility is used as the example engine, and the data values provided ... |
|
| Remote Sensing for Inland Water Quality Monitoring: A U.S. Army Corps of Engineers Perspective |
Oct 2011 |
52 pages |
| Authors:
Molly Reif; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| Many agencies, including the U.S. Army Corps of Engineers, are responsible for ensuring that national water quality standards are met. The Corps manages and monitors water quality of all waters within Corps jurisdictions outlined in Water Quality Management Plans, including traditional field sampling (water, sediment, and biological) and measurement of physical parameters. However, these traditional approaches can be labor-intensive and expensive, often providing discrete data at a single point in ... |
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| Introduction of Automation for the Production of Bilingual, Parallel-Aligned Text |
Oct 2011 |
18 pages |
| Authors:
Will Tanenbaum; Steven A LaRocca; John J Morgan; Ghulam H Jahed; ARMY RESEARCH LAB ADELPHI MD COMPUTATIONAL AND INFORMATION SCIENCES DIRECTORATE
|
| As the study and application of statistical machine translation (SMT) grows, progress is often circumscribed by a lack of data. The statistical models that govern statistical machine translation (SMT) engines rely on many large bilingual text corpora, each comprised of vast numbers of bilingual text segments. For certain languages, corpora already exist and help to power translation engines. Regrettably, this is not the case for every language the Army is ... |
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| Characterization and Discrimination of Large Caliber Gun Blast and Flash Signatures |
Oct 2011 |
254 pages |
| Authors:
Bryan J Steward; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| Two hundred and one firings of three 152 mm howitzer munitions were observed to characterize firing signatures of a large caliber gun. Muzzle blast expansion was observed with high-speed (1600 Hz) optical imagery. The trajectory of the blast front was well approximated by a modified point-blast model described by constant rate of energy deposition. Visible and near-infrared (450 - 850 nm) spectra of secondary combustion were acquired at 0.75 nm ... |
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| What Barriers Prevent ICME from Becoming Part of the Designer's Tollbox? (Preprint) |
Oct 2011 |
8 pages |
| Authors:
P L Ret; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Integrated computational materials engineering methodologies promise a revolutionary step forward in the qualification, certification, and sustainment of Air Force systems via reduction of the historically slow and costly materials data development footprint [1,2,3]. The establishment of scientifically-based, statistically-robust processes by which computational materials models can be quantitatively graded, accepted and utilized by the aerospace structures design, manufacture, and sustainment communities for cost and time savings presents a major hurdle towards ... |
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| Efficient Propagation of Uncertainty in Simulations via the Probabilistic Collocation Method (Postprint) |
Oct 2011 |
10 pages |
| Authors:
Jeremy S Knopp; Mark P Blodgett; John C Aldrin; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH MATERIALS AND MANUFACTURING DIRECTORATE
|
| Eddy current models have matured to such a degree that it is now possible to simulate realistic nondestructive inspection (NDI) scenarios. Models have been used in the design and analysis of NDI systems and to a limited extent, model-based inverse methods for Nondestructive Evaluation (NDE).The science base is also being established to quantify the reliability systems via Model-Assisted Probability of Detection (MAPOD), In realistic situations, it is more accurate to ... |
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| Utilization of Telehealth Technology to Develop and Implement a Comprehensive Management Initiative for Chronic Diseases |
Oct 2011 |
17 pages |
| Authors:
Robert A Vigersky; HENRY M JACKSON FOUNDATION FOR THE ADVANCEMENT OF MILITARY MEDICINE ROCKVILLE MD
|
| Chronic diseases affect over 90 million Americans and result in high health care costs and tremendous personal and societal burden. Diabetes is, arguably, among the most pervasive and researched chronic diseases. Research shows that much of the costs and burden of diabetes can be mitigated with appropriate education, care- and self-management. This project, called the Comprehensive Management for Chronic Disease (CMICD), focuses on innovative technology approaches to improving education about ... |
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| Combining Ensemble and Variational Data Assimilation |
30 Sep 2011 |
8 pages |
| Authors:
Peter R Oke; Alexandre Kurapov; OREGON STATE UNIV CORVALLIS COLL OF OCEANIC AND ATMOSPHERIC SCIENCES
|
| The long-term goal of this project is to develop and apply practical methods for data assimilation to improve the short-range prediction of mesoscale ocean variability. The primary objective of this work is to develop an ocean data assimilation system that exploits the strengths of both the ensemble-based (e.g., Evensen 2003; Houtekamer and Mitchell 1998; Tippett et al. 2003) and variational (e.g., Bennett 2002) approaches to data assimilation. The first step ... |
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| The Influence of Atmosphere - Ocean Interaction on MJO Development and Propagation |
30 Sep 2011 |
9 pages |
| Authors:
Maria Flatau; Toshiaki Shinoda; Sue Chen; Tommy Jensen; NAVAL RESEARCH LAB MONTEREY CA
|
| The long-term goal of this project is to understand the role of the atmosphere-ocean interaction processes in the initiation, maintenance and propagation of Madden Julian Oscillation (MJO). Better grasp of the atmosphere/ocean feedbacks in the Tropics will allow formulating more accurate parameterizations of the air-sea interface in the forecasting models. It will contribute to improved predictability of the MJO and other coupled phenomena on various special and temporal scales. The ... |
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| Training and Research in Oceanic and Atmospheric Processes in Tropical Cyclones (TROPIC) |
30 Sep 2011 |
9 pages |
| Authors:
Elizabeth R Sanabia; NAVAL ACADEMY ANNAPOLIS MD DEPT OF OCEANOGRAPHY
|
| The overarching goal of this research is to improve tropical cyclone (TC) forecast accuracy. Three principle objectives ar designed to achieve the long-term goal: 1. Improve observational data quality, 2. Analyze variations between model and observed values of ocean heat content, and 3. Evaluate sensitivity of statistical-dynamical model TC intensity forecasts to observed values of ocean heat content. |
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| Alternative Penetrometers to Measure the Near Surface Strength of Soft Seafloor Soils |
30 Sep 2011 |
7 pages |
| Authors:
Mark R Tufenkjian; CALIFORNIA UNIV LOS ANGELES DEPT OF CIVIL ENGINEERING
|
| Develop an alternative penetrometer to accurately measure the undrained shear strength of near surface soft seafloor soils. Further the education of participating undergraduate students by active involvement in research and mentoring activities. In collaboration with the Naval Facilities Engineering Service Center (NFESC) in Port Hueneme, assess the feasibility of using full-flow penetrometer technology to meet Navy requirements. Design, build, and test a full-flow penetrometer that will accurately measure the near ... |
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| Efficient Inversion in Underwater Acoustics with Iterative and Sequential Bayesian Methods |
30 Sep 2011 |
10 pages |
| Authors:
Zoi-Heleni Michalopoulou; NEW JERSEY INST OF TECH NEWARK DEPT OF MATHEMATICAL SCIENCES
|
| LONG TERM GOALS: The long term goal of this project is to develop efficient inversion algorithms for successful geoacoustic parameter estimation and source localization, exploiting (fully or partially) the physics of the propagation medium. Algorithms are designed for geoacoustic inversion via the extraction features of the acoustic field. OBJECTIVES: Achieve accurate and computationally efficient geoacoustic inversion and source localization by designing estimation schemes that combine acoustic field modeling and statistical ... |
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| Office of Naval Research Graduate Traineeship Award in Ocean Acoustics for Ankita Deepak Jain |
30 Sep 2011 |
5 pages |
| Authors:
Nicholas C Makris; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
| OBJECTIVES A primary goal of this research is to model biological clutter in the continental shelf environments of the ocean. We aim to do this by modeling scattered returns from fish shoals in continental shelf environments using a full field matched filter approach as well as its single frequency approximation. This will help in characterizing clutter and will help distinguish scattered fields of moving targets from stationary background reverberation and ... |
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| On Convergence of the Immersed Boundary Method for Elliptic Interface Problems |
29 Sep 2011 |
13 pages |
| Authors:
Zhilin Li; NORTH CAROLINA STATE UNIV AT RALEIGH CENTER FOR RESEARCH IN SCIENTIFIC COMPUTATION
|
| Peskin's Immersed Boundary (IB) method is one of the most popular numerical methods for many years and has been applied to problems in mathematical biology, fluid mechanics material sciences, and many other areas. Peskin's IB method is associated with discrete delta functions. It is believed that the IB method is first order accurate in the L(infinity) norm. But almost none rigorous proof could be found in the literature until recently ... |
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| Health Management and Service Life for Air Force Missiles |
26 Sep 2011 |
27 pages |
| Authors:
Andrew Sincock; Greg Ruderman; Eric Weber; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
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| This briefing is about health management and service life for Air Force missiles. In 1994, industry and government addressed the issue of service life prediction of rocket motors. Consensus of the community was that the best predictions could be trusted to at most five years. Only way to accurately improve predictions was to move to a mechanistic (first-principles) methodology. Doubling the look-ahead window gives sufficient time to replace system without ... |
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| DOD Financial Management: Improved Controls, Processes, and Systems Are Needed for Accurate and Reliable Financial Information |
23 Sep 2011 |
28 pages |
| Authors:
Asif A Khan; J C Martin; F A Dymond; Gayle Fischer; Greg Pugnetti; Darby Smith; Beatrice Alff; Steve Donahue; Keith McDaniel; Maxine Hattery; Hal Santarelli; Sandy Silzer; GOVERNMENT ACCOUNTABILITY OFFICE WASHINGTON DC
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| The department is facing near and long-term internal fiscal pressures as it attempts to balance competing demands to support ongoing operations, rebuild readiness following extended military operations, and manage increasing personnel and health care costs as well as significant cost growth in its weapon systems programs. For more than a decade, DOD has dominated GAO s list of federal programs and operations at high risk of being vulnerable to fraud, ... |
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| Effect of Storm Enhanced Densities on Geo-Location Accuracy over CONUS |
15 SEP 2011 |
112 pages |
| Authors:
Lindon H. Steadman; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
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| Storm enhanced densities (SEDs) are ionospheric plasma enhancements that disrupt radio communications in the near-Earth space environment, degrading the Global Positioning System (GPS) and other key technologies. Accurate GPS/total electron content (TEC) correction maps produced by ionosphere models can mitigate degradations from SEDs. An artificial SED was created and ingested via slant TEC measurements into the Global Assimilation of Ionospheric Measurements Gauss-Markov Kalman Filter Model to determine how many ground ... |
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