| Astrometry With the Hubble Space Telescope: Trigonometric Parallaxes of Planetary Nebula Nuclei NGC 6853, NGC 7293, ABELL 31, and DeHt 5 |
Dec-2009 |
17 pages |
| Authors:
Edmund Nelan; Howard E Bond; Hugh C Harris; G F Benedict; Barbara E McArthur; Ralf Napiwotzki; Thomas E Harrison; Richard J Patterson; Robin Ciardullo; TEXAS UNIV AT AUSTIN
|
 | We present absolute parallaxes and relative proper motions for the central stars of the planetary nebulae NGC 6853 (The Dumbbell), NGC 7293 (The Helix), Abell 31, and DeHt 5. This paper details our reduction and analysis using DeHt 5 as an example. We obtain these planetary nebula nuclei (PNNi) parallaxes with astrometric data from Fine Guidance Sensors FGS 1r and FGS 3, white-light interferometers on the Hubble Space Telescope. Proper ... |
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| Body Size Changes of Royal Australian Air Force Aircrew: 1971 - 2005 |
Aug-2009 |
34 pages |
| Authors:
Grant Tomkinson; Adam Clark; Peter Blanchonette; DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR OPERATIONS DIV
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| The aim of this study was to quantify the secular changes in body dimensions of Royal Australian Air Force (RAAF) aircrew between 1971 and 2005. Small secular increases were observed for most body dimensions, including height, mass and body mass indices, although a small decline was observed for head girth. These secular changes (except for head girth) were not independent of changes in overall body size. In addition, secular changes ... |
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| Characterization of MEMS a Directional Microphone with Solid and Perforated Wings |
01-Jun-2009 |
57 pages |
| Authors:
Norbahrin Muamad; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| This goal of this research is to characterize two microelectromechanical system (MEMS) based directional sound sensors with solid and perforated wings. The design of the sensors was based on the structure of Ormia ochracea fly's hearing system that has highly directional hearing through mechanical coupling of the eardrums. The sensors are made of 10 micron thick single crystal silicon layer with dimensions 1 x 2 mm2. The sensors were fabricated ... |
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| Development of a Computer-aided Diagnosis System for Early Detection of Masses Using Retrospectively Detected Cancers on Prior Mammograms |
Jun-2009 |
128 pages |
| Authors:
Jun Wei; Wendy M Kohrt; L M Glode; Robert S Schwartz; Daniel W Barry; MICHIGAN UNIV ANN ARBOR
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| The performance of a CAD system for subtle lesions is generally much lower than their performance for less subtle lesions. The goal of this project is to develop a CAD system using advanced computer vision techniques aiming at improved detection of retrospectively seen cancers on prior mammograms and incorporate the developed CAD system into our current CAD system. During the project years, we have performed the following tasks: (1) collect ... |
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| Gear Fault Detection Effectiveness as Applied to Tooth Surface Pitting Fatigue Damage |
May-2009 |
28 pages |
| Authors:
David G Lewicki; Paula J Dempsey; Gregory F Heath; Perumal Shanthakumaran; ARMY RESEARCH LAB CLEVELAND OH VEHICLE TECHNOLOGY DIRECTORATE
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| A study was performed to evaluate fault detection effectiveness as applied to gear tooth pitting fatigue damage. Vibration and oil-debris monitoring (ODM) data were gathered from 24 sets of spur pinion and face gears run during a previous endurance evaluation study. Three common condition indicators (RMS, FM4, and NA4) were deduced from the time-averaged vibration data and used with the ODM to evaluate their performance for gear fault detection. The ... |
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| Oxidation of ZrB2 and ZrB2-SiC Ceramics With Tungsten Additions (Preprint) |
Feb-2009 |
11 pages |
| Authors:
S C Zhang; W G Fahrenholtz; G E Hilmas; MISSOURI UNIV-ROLLA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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| The effect of tungsten additions on the oxidation behavior of zirconium diboride-based ceramics was studied. Four mole percent tungsten carbide was added to ZrB2. The oxidation behavior was studied using thermal gravimetric analysis and isothermal testing in flowing air. Upon heating to 1500 degrees C, the mass gain decreased from approx. 14 milligrams/(square centimeter) for nominally pure ZrB2 to approx. 4.5 milligrams/(square centimeter) for tungsten containing ZrB2. After heating to ... |
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| Innovative Energy Absorbing Mounting Systems for High Mass Rotorcraft Payloads |
Dec-2008 |
9 pages |
| Authors:
Charles E Bakis; William Kong; Chandrashekhar Tiwari; Matthew J Hagon; Edward C Smith; Michael A Yukish; PENNSYLVANIA STATE UNIV UNIVERSITY PARK
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| This paper presents recent developments on two innovative types of crashworthy cargo restraints for high mass rotorcraft payloads: textile-based devices and flexible matrix composite devices. Each type of device employs energy dissipation mechanisms to arrest the motion of payloads and limit the maximum load transmitted to tie-down points, thereby maintaining control over payload motion and improving crew survivability in the event of a crash or hard landing. The benefit of ... |
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| Mass Remaining During Evaporation of Sessile Drop |
01-Sep-2008 |
35 pages |
| Authors:
James E Danberg; SCIENCE APPLICATIONS INTERNATIONAL CORP (SAIC) ABINGDON MD
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| A theory to predict the evaporation rate of HD (mustard agent) for the special case of a glass substrate has been developed. This is an important reference case for the wind tunnel and field test measurements of the HD evaporation rate. The HD drop is treated as a spherical segment with a constant base diameter characterized by the variation of the droplet shape factor (height to base diameter) or contact ... |
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| Optically Defined Chemical Functionalization of Silicon Nanomechanical Resonators for Mass Sensing |
Aug-2008 |
5 pages |
| Authors:
Jeffrey W Baldwin; Maxim K Zalalutdinov; Bradford B Pate; Michael J Martin; Brian H Houston; NAVAL RESEARCH LAB WASHINGTON DC
|
| Nanomechanical resonators with their extremely small mass and high surface/volume ratio present a unique opportunity for mass sensing[1-4]. However, functionalization with selective vapor adsorptive functional groups has been an impediment to the realization of nanomechanical systems for mass sensing. Functional groups that adsorb analytes of interest should be patterned only on the nanoresonator itself, and should not be located on structural elements or micro-channel walls, which would greatly limit the ... |
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| A Tool for Calculating the Center of Mass and Moment of Inertia of Small Arms Weapons |
01-Jul-2008 |
28 pages |
| Authors:
Michael E LaFiandra; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD HUMAN RESEARCH AND ENGINEERING DIRECTORATE
|
| The center of mass (COM) of a body or segment is the point about which the mass of the body or segment is evenly distributed. Moment of inertia (MOI) is the measure of a segment or object's resistance to changes in angular velocity. Mass properties, such as COM, MOI, and mass, allow for characterization of objects and for an easy comparison of the effects of force and torque on the ... |
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| Internal Mass Motion for Spacecraft Dynamics and Control |
01 MAY 2008 |
5 pages |
| Authors:
Christopher D. Hall; VIRGINIA POLYTECHNIC INST BLACKSBURG
|
| We present a detailed description of the application of a noncanonical Hamiltonian formulation to the modeling, analysis, and simulation of the dynamics of gyrostat spacecraft with internal mass motion. The methods have been applied to the practical implementation of control of a three-dimensional air bearing spacecraft simulator. We also present the analysis of electrodynamic tether systems, including optimal control of a simplified model. |
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| Design and Response of a Structural Multifunctional Fuel Cell |
MAR 2008 |
34 pages |
| Authors:
Joseph South; Daniel Baechle; Corydon Hilton; Daniel DeSchepper; Eric Wetzel; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Many U.S. Army systems, such as ground vehicles and fully equipped Soldiers, are comprised of multiple subcomponents which each typically perform unique functions. Combining these functions into a single, multifunctional component may reduce mass and improve overall system efficiency. Of particular interest are structural materials that also provide power- generating or energy-storing capacity and could provide significant weight savings over a range of platforms. In this study, structural fuel cells ... |
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| Parametric Study on the Interior Ballistics of 105 and 155 mm Artillery Guns |
MAR 2008 |
|
| Authors:
Vincent Tanguay; DEFENCE RESEARCH AND DEVELOPMENT CANADA VALCARTIER (QUEBEC)
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 | The interior ballistics code IBHVG2 was used to calculate the muzzle velocity and peak acceleration of projectiles ranging in mass from 10 to 50 kg. The simulations were performed with both 105 and 155 mm guns. These were the C3 and LG1 (105 mm and 52-calibre M777 were also considered. Three propellants were investigated: the triple base M31, and two composite propellants, JA2 and the developmental propellant LCT. For ever ... |
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| Operation Iraqi Freedom: Strategies, Approaches, Results, and Issues for Congress |
22-Feb-2008 |
|
| Authors:
Catherine M Dale; LIBRARY OF CONGRESS WASHINGTON DC CONGRESSIONAL RESEARCH SERVICE
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| Operation Iraqi Freedom (OIF) was launched on March 20, 2003. The immediate goal, as stated by the Bush Administration, was to remove the regime, including destroying its ability to use weapons of mass destruction or to make them available to terrorists. The broad, longer-term objective included helping Iraqis build a new Iraq that is prosperous and free. 1 In October 2002, Congress had authorized the President to use force against ... |
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| Effects of Personal Helicopter Oxygen Delivery System (PHODS) Nasal Cannula Installation on the Lateral Impact Protection of the HGU-56/P Aircrew Integrated Helmet System (AIHS) |
DEC 2007 |
37 pages |
| Authors:
Frederick Brozoski; Katie Padgett; James Lindsey; ARMY AEROMEDICAL RESEARCH LAB FORT RUCKER AL
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| The USAARL was tasked by the Product Manager, Air Warrior, to evaluate the Aqualung Portable Helicopter Oxygen Delivery System (PHODS). The objectives were to assess the blunt impact protection and mass properties of the HGU-56/P helmets modified with the PHODS nasal cannula. Six small HGU-56/P helmets were modified with nasal cannulas and subjected to blunt eardome impacts per the HGU-56/P product specification. Mass and center of mass (CM) assessments were ... |
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| Modifiable Risk Factors for Lymphedema in Breast Cancer Survivors |
OCT 2007 |
26 pages |
| Authors:
Mary A. Rossing; Kathleen E. Malone; FRED HUTCHINSON CANCER RESEARCH CENTER SEATTLE WA
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| In this study, 433 women with invasive breast cancer who had >5 axillary lymph nodes removed were followed for the development of arm lymphedema. Participants completed a baseline interview and subsequent interviews at 6-9 month intervals. Lymphedema was identified through self-report and through measurement of arm volume. Slightly more than half of participants reported arm swelling (n=228; 52.7%). Measured arm volume excess of >10% comparing the surgery-side to the opposite ... |
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| Temporal Subtraction of Digital Breast Tomosynthesis Images for Improved Mass Detection |
OCT 2007 |
22 pages |
| Authors:
Christina M. Li; DUKE UNIV DURHAM NC
|
| Digital breast tomosynthesis (DBT) strives to overcome the obstacles presented in conventional 2D mammography by taking multiple projections over a fixed angle and reconstructing volumetric data isolates overlying anatomy from in-plane structures and amplify the conspicuity of lesions. Temporal subtraction automates the process of comparative analysis by using two images taken sequentially and subtracting them in order to find temporal discrepancies. The purpose of this project is to determine the ... |
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| Oscillations of a Multi-String Pendulum |
14 SEP 2007 |
152 pages |
| Authors:
A. Dendis; F. A. Papoulias; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The mathematical pendulum is one of the most widely studied problem in engineering physics. This is, however, primarily limited to the classical pendulum with a single bar and mass configuration. Extensions to this include multi-degree of freedom systems, but many of the classical assumptions, such as a single bar per mass, are preserved. Several designs used in practice utilize multiple or trapezoidal configurations in order to enhance stability. Such designs ... |
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| Feasibility of Determining Aerodynamic Coefficients for a NASA Apollo Body With the Use of Telemetry Data From Free Flight Range Testing |
SEP 2007 |
25 pages |
| Authors:
Benjamin Topper; T. G. Brown; Edward Bukowski; Bradford S. Davis; Rex A. Hall; Peter C. Muller; Timothy T. Vong; Fred J. Brandon; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| The U.S. Army Research Laboratory (ARL) was requested by the National Aeronautics and Space Administration's (NASA s) Langley Research Center to perform a free-flight experiment with telemetry (TM) instrumented sub-scaled re-entry vehicle in order to determine the feasibility of using TM to obtain aerodynamic coefficients. NASA s current ability to collect aerodynamics data of subscale re-entry vehicles has been limited to forced oscillation wind tunnel testing with a sting-mounted model ... |
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| An Analysis of IEEE 802.16 and WiMAX Multicast Delivery |
SEP 2007 |
99 pages |
| Authors:
Patrick A. Staub; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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| Broadband and wireless have enjoyed a massive mass market adoption in the past twenty years. Users want to be able to enjoy all applications, including multimedia, voice, and data, while still being able to access them in a mobile and fixed environment. Multicasting is a tool used in networking which allows for transmitting information to a select group of users and is especially useful for time-sensitive data which can be ... |
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| Oral Contraceptives and Bone Health in Female Runners |
AUG 2007 |
144 pages |
| Authors:
Jennifer L. Kelsey; STANFORD UNIV CA
|
| Highly trained female athletes may experience loss of menses because of their participation in intense physical activity. Previous cross-sectional research has shown that women with exercise-induced menstrual irregularities have a significantly higher frequency of stress fractures and low bone mass than normally menstruating controls. Longitudinal studies suggest that these women are losing bone mass over time. Low serum estrogen levels are believed to be a principal cause of the bone ... |
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| The Effects of the Personal Armor System for Ground Troops (PASGT) and the Advanced Combat Helmet (ACH) with and without PVS-14 Night Vision Goggles (NVG) on Neck Biomechanics During Dismounted Soldier Movements |
JUL 2007 |
40 pages |
| Authors:
Michael LaFiandra; Everett Harman; Nancy Cornelius; Peter Frykman; David Gutekunst; Gabe Nelson; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA MILITARY PERFORMANCE DIV
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| Kevlar helmets provide the soldier with basic ballistic and impact protection. However, the helmet has recently become a mounting platform for devices such as night-vision goggles, drop down displays, weapon-aiming systems, etc. Although designed to enhance soldier performance, these systems increase the mass of the helmet and typically shift the position of the helmet's center of mass forward. The effects of changing the mass properties of the helmet on head ... |
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| Magnetic Resonance Imaging of Polymeric Drug Delivery Systems in Breast Cancer Solid Tumors |
JUL 2007 |
29 pages |
| Authors:
Bahar Zarabi; Hamid Ghandehari; BALTIMORE UNIV MD
|
| The overall purpose of this research is to develop a polymeric drug delivery system containing magnetic resonance contrast agents for the treatment of breast cancer. This drug-imaging agent delivery system will allow the follow up of the fate of the drug delivery system and its relation to reduced tumor mass, improved efficacy and reduced toxicity in individual patients. In three years, progress was made in the following areas: 1) Synthesis, ... |
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| Development of a Computer-Aided Diagnosis System for Early Detection of Masses Using Retrospectively Detected Cancers on Prior Mammograms |
01 JUN 2007 |
85 pages |
| Authors:
Jun Wei; MICHIGAN UNIV ANN ARBOR
|
| The goal of this project is to develop a computer-aided diagnosis (CAD) system for mass detection using advanced computer vision techniques that will be trained with retrospectively detected cancers on prior mammograms. The new CAD system will be combined with our existing CAD system. When fully developed, the new dual CAD system should increase the sensitivity of detecting cancers at the early stage without compromising the sensitivity for other cancers. ... |
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| Mass Medication Clinic (MMC) Patient Medical Assistant (PMA) System Training Initiative |
JUN 2007 |
151 pages |
| Authors:
R. D. Clyde; Victoria Garshnek; Lawrence Burgess; CTA SOLUTIONS HONOLULU HI
|
| In a disease outbreak medication needs to be rapidly yet safely distributed to a population to minimize infection outbreak. We investigated if there are significant differences in efficiency (time) and error rates in drug dissemination to large groups of people using algorithm driven paper vs. PDA methodology. Subjects were sent through points of dispensing with volunteer clerks processing them during two sessions (alternating modes for session two). Time to process ... |
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| Exercise to Countereact Loss of Bone and Muscle During Androgen Deprivation Therapy in Men with Prostate Cancer |
MAY 2007 |
8 pages |
| Authors:
Wendy M. Kohrt; L. M. Glode; Robert S. Schwartz; Daniel W. Barry; COLORADO UNIV HEALTH SCIENCES CENTER AURORA CO
|
| The original objective was to determine whether a 1-year intensive resistance exercise training (RT) program is more effective than a moderate-intensity walking program in ameliorating the effects on body composition of androgen deprivation therapy (ADT) in men with prostate cancer. It was postulated that: 1) RT will attenuate the declines in bone mineral density (BMD) and fat-free mass (FFM) to a greater extent than walking; and 2) both RT and ... |
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| Chemical Industry Security: Voluntary or Mandatory Approach? |
MAR 2007 |
93 pages |
| Authors:
Paul D. Baldauf; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A successful attack on a hazardous materials storage facility has the potential to cause mass casualties and panic. Although the risk and consequences vary greatly among these sites, there are a significant number of facilities with tens of thousands of individuals who live and work in the vulnerability zone. Until P.L. 109-125 was enacted on October 4, 2006, which required the Department of Homeland Security (DHS) to issue regulations establishing ... |
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| The 2006 Annual Report of the United States Intelligence Community |
Feb-2007 |
26 pages |
| Authors:
OFFICE OF THE DIRECTOR OF NATIONAL INTELLIGENCE WASHINGTON DC
|
| In Fiscal Year (FY) 2006, the Intelligence Community (IC) contributed to the security of the United States and helped protect and advance national interests. Building on the important structural changes made just before FY 2006, the IC acted in a more integrated manner than ever before against our most important objectives, as expressed in our National Intelligence Strategy, assisting decisionmakers to understand the world around us and to act on ... |
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| Systemic Operational Design: Bringing Efficacy to the Operational Level of War |
FEB 2007 |
73 pages |
| Authors:
Barrett M. Bernard; ARMY COMMAND AND GENERAL STAFF COLL FORT LEAVENWORTH KS SCHOOL OF ADVANCED MILITARY STUDIES
|
| The premise of this monograph is that the Elements of Operational Design are incapable of linking the tactical employment of forces to strategic objectives and that Systemic Operational Design is a viable alternative. This monograph introduces the reader to Systemic Operational Design by providing an application of it to the Global War on Terrorism. The narrative generated by this application serves as a vehicle to explore the depths of Systemic ... |
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| The Mira Variable S Orionis: Relationships Between the Photosphere, Molecular Layer, Dust Shell, and SiO Maser Shell at 4 Epochs |
2007 |
21 pages |
| Authors:
M. Wittkowski; D. A. Boboltz; K. Ohnaka; T. Driebe; M. Scholz; EUROPEAN SOUTHERN OBSERVATORY MUENCHEN (GERMANY)
|
| We present the first multi-epoch study that includes concurrent mid-infrared and radio interferometry of an oxygen-rich Mira star. We obtained mid-infrared interferometry of S Ori with VLTI/MIDI at four epochs. We concurrently observed v = 1, J = 1-0 (43.1GHz), and v = 2, J = 1-0 (42.8GHz) SiO maser emission toward S Ori with the VLBA in January, February, and November 2005. The MIDI data are analyzed using self-excited ... |
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| Foreign Perspectives on U.S. Nuclear Policy and Posture |
12 DEC 2006 |
363 pages |
| Authors:
Lewis A. Dunn; Gregory Giles; Jeffrey Larsen; Thomas Skypek; SCIENCE APPLICATIONS INTERNATIONAL CORP ALEXANDRIA VA
|
| The Defense Threat Reduction Agency (DTRA) was founded in 1998 to integrate and focus the capabilities of the Department of Defense (DoD) that address the weapons of mass destruction threat. To assist the Agency in its primary mission, the Advanced Systems and Concepts Office (ASCO) develops and maintains an evolving analytical vision of necessary and sufficient capabilities to protect United States and Allied forces and citizens from WMD attack. ASCO ... |
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| Bone Growth, Mechanical Stimulus and IGF-1 |
01 OCT 2006 |
51 pages |
| Authors:
Vicente Gilsanz; CHILDREN'S HOSPITAL LOS ANGELES CA
|
| The purpose of this study was to assess the potential for brief periods of low magnitude high frequency mechanical stimulation signals in the musculoskeletal system. The major findings were that short bouts of extremely low-level mechanical signals, several orders of magnitude below that associated with vigorous exercise, increased bone and muscle mass in the weight bearing skeleton of young adult females with low bone density. Ultimately, this information could be ... |
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| New Advanced Mass Casualty Breathing System for Oxygen Therapy: Phase 1 |
OCT 2006 |
|
| Authors:
F. Bouak; D. J. Eaton; DEFENCE RESEARCH AND DEVELOPMENT TORONTO (CANADA)
|
| This report describes the first phase of a project to develop an efficient mass casualty oxygen (O2) breathing system for O2 therapy in remote areas. In this first phase, DRDC Toronto was tasked to investigate the performance of the Pulmanex Hi-Ox mask (Hi-Ox) at O2 flow rates from 4 litres per minute (L min-1) down to 0.5 L min-1. Performance was evaluated with eighteen male and female volunteers between the ... |
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| Oral Contraceptives and Bone Health in Female Runners |
OCT 2006 |
76 pages |
| Authors:
Jennifer L. Kelsey; STANFORD UNIV CA
|
| This was a two-year randomized trial of the effects of oral contraceptives on bone mass and stress fracture incidence among 150 female competitive distance runners of ages 18-26 years. The Coordinating Center is at Stanford University and bone mass was measured at five sites: Massachusetts General Hospital, University of California Los Angeles, University of Michigan, Stanford University/Palo Alto VA Medical Center, and Helen Hayes Hospital in West Haverstraw NY. Two ... |
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| PTM: Particle Tracking Model. Report 1: Model Theory, Implementation, and Example Applications |
SEP 2006 |
168 pages |
| Authors:
Neil J. MacDonald; Michael H. Davies; Alan K. Zundel; John D. Howlett; Zeki Demirbilek; Joseph Z. Gailani; Tahirih C. Lackey; Jarrell Smith; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| This report introduces a Lagrangian-based Particle Tracking Model (PTM) developed by the Coastal Inlets Research Program (CIRP) and the Dredging Operations and Environmental Research Program (DOER) being conducted at the U.S. Army Engineer Research and Development Center. The PTM's Lagrangian framework is one in which the sediment being modeled is discretized into a finite number of particles that are followed as they are transported by the flow. Lagrangian modeling is ... |
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| High-Efficiency Helical Coil Electromagnetic Launcher |
31 AUG 2006 |
37 pages |
| Authors:
Thomas G. Engel; William C. Nunnally; John M. Gahl; MISSOURI UNIV-COLUMBIA DEPT OF ELECTRICAL ENGINEERING
|
| Technical progress during the reporting period includes the development of new theory for electromagnetic launcher efficiency which is applicable to all constant inductance gradient launcher geometries. This theory also develops methods to predict the performance of different geometry electromagnetic launchers and compare them to each other. A theoretical analysis is also presented to design a helical electromagnetic launcher for a specific volt- amp characteristic. Experimentally measured performance is reported for ... |
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| Conveyor Belt Transport; the Role of Friction and Mass in the Separation of Arbitrary Collections of Microparticles |
AUG 2006 |
14 pages |
| Authors:
Robert W. Carpick; Mark A. Eriksson; WISCONSIN UNIV-MADISON BOARD OF REGENTS/RESEARCH SPONSORED PROGRAMS
|
| We have investigated the role of interfacial chemistry, friction, and mass on the behavior of collections of microparticles and nanoparticles. These objects are the potential building blocks of any number of nanoscale and microscale devices and machines. To create such devices, a "nano-factory" is required, where creative combinations of "top-down" and" bottom-up" approaches are integrated to create a versatile and reliable factory. A key component of such a factory is ... |
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| Water and Electrolyte Needs for Football Training and Match-Play |
JUL 2006 |
|
| Authors:
S. M. Shirreffs; M. N. Sawka; M. Stone; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
|
| The high metabolic rates sustained by soccer players during training and match-play cause sweat to be produced in both warm and temperate environments. There is limited published information available on the effects of this sweat loss on performance in soccer. However, this limited information, together with knowledge of the effects of sweat loss in other sports with skill components as well as endurance and sprint components, suggests that the effects ... |
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| An Aerothermal Flexible Mode Analysis of a Hypersonic Vehicle (Postprint) |
JUL 2006 |
25 pages |
| Authors:
Trevor Williams; Michael A. Bolender; David B. Bowman; Oscar Morataya; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH AIR VEHICLES DIRECTORATE
|
| This paper describes a method for the determination of the flexible modes of an air-breathing hypersonic vehicle. The method outlined here takes into account changes in vehicle mass and structural temperature over the duration of the vehicle's trajectory. A simple sizing program is outlined to estimate the vehicle volume, mass, and planform requirements for a dual-cycle (rocket and scramjet) powered vehicle. It is shown that the varying mass effects dominate ... |
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| Does Skeletal Muscle Mass Influence Breast Cancer? Evaluating Mammary Tumorigenesis and Progression Genetically Hyper-Muscular Mice |
JUL 2006 |
9 pages |
| Authors:
Teresa Zimmers; MIAMI UNIV FL
|
| Epidemiologic evidence demonstrates that caloric restriction and physical activity independently reduce breast cancer. Conversely, obesity and insulin resistance are associated with increased breast cancer incidence, metastasis and mortality. To date, no studies have addressed the role of skeletal muscle in breast cancer. To determine the effect of skeletal muscle mass on breast cancer, we are measuring rates of chemically induced mammary tumorigenesis and progression in genetically hypermuscular mice. Mice lacking ... |
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| M433 Center of Mass Location Throughout Fuze Arming Cycle |
JUN 2006 |
17 pages |
| Authors:
Adam M. Jacob; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ
|
| The effects on the center of gravity of the M433 4O-mm round due to the arming of its M550 fuze while in flight were studied. The results of this study would be used to assist in determining whether this center of gravity change contributes to instabilities during the round's flight. The study was performed using dynamic simulation software. A virtual model of the M433 round was built, and the location ... |
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| Modeling Study to Quantify the Benefits of Groundwater Contaminant Source Remediation |
MAR 2006 |
115 pages |
| Authors:
David E. Wagner; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| The purpose of this research was to quantify the benefits of groundwater contaminant source remediation by using a model to simulate how reduction of source mass was related to reduction of contaminant concentration at a receptor. This thesis sought to answer three research questions: (1) how are contaminant source mass reduction and reduction of mass flux leaving the source-zone related; (2) how can we quantify the effect of the important ... |
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| A Comparison of Main Rotor Smoothing Adjustments Using Linear and Neural Network Algorithms |
MAR 2006 |
146 pages |
| Authors:
Nathan A. Miller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Helicopter main rotor smoothing is a maintenance procedure that is routinely performed to minimize airframe vibrations induced by non-uniform mass and/or aerodynamic distributions in the main rotor system. This important task is both time consuming and expensive, so improvements to the process have long been sought. Traditionally, vibrations have been minimized by calculating adjustments based on an assumed linear relationship between adjustments and vibration response. In recent years, artificial neural ... |
|
| A Proposal to Develop and Test a Fibre-Optic Coupled Solar Thermal Propulsion System for Microsatellites |
MAR 2006 |
94 pages |
| Authors:
Paul Henshall; SURREY UNIV GUILDFORD (UNITED KINGDOM)
|
| This report results from a contract tasking University of Surrey. Solar Thermal Propulsion (STP) previously envisioned for large spacecraft and capable of high levels of propulsive performance ( |
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| On-Line Path Generation and Tracking for High-Speed Wheeled Autonomous Vehicles |
17 FEB 2006 |
59 pages |
| Authors:
Panagiotis Tsiotras; GEORGIA INST OF TECH ATLANTA
|
| In this work we proposed two semi-analytic methods to generate minimum and near-minimum time velocity profiles for a vehicle along a specified path. Initially we adopt a point mass parameterization of the vehicle with specified acceleration limits. In generating the optimal velocity profile, several undesirable cases, where loss of controllability occurs, and which have been neglected in the literature, are dealt with in this work. A receding horizon implementation is ... |
|
| Military Power of the People's Republic of China 2006. Annual Report to Congress |
2006 |
58 pages |
| Authors:
OFFICE OF THE SECRETARY OF DEFENSE WASHINGTON DC
|
| China's rapid rise as a regional political and economic power with global aspirations is an important element of today's strategic environment - one that has significant implications for the region and the world. The United States welcomes the rise of a peaceful and prosperous China. U.S. policy encourages China to participate as a responsible international stakeholder by taking on a greater share of responsibility for the health and success of ... |
|
| Soil Freeze-Thaw Effects on Bank Erosion and Stability: Connecticut River Field Site, Norfolk, Vermont |
DEC 2005 |
56 pages |
| Authors:
Michael G. Ferrick; Lawrence W. Gatto; Steven A. Grant; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
|
| Bank recession resulting from surficial erosion and mass failure is a consequence of hydraulic forces and geotechnical processes. One important set of geotechnical processes in regions where seasonal frost forms is soil freeze-thaw (FT) cycling and associated ground-ice growth and melt. In cold regions soil FT processes usually cause more bank recession annually than other processes. The magnitude of FT effects is variable, depending on soil type, water content, and ... |
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| Energetic Residues From Live-Fire Detonations of 120-mm Mortar Rounds |
DEC 2005 |
31 pages |
| Authors:
Michael R. Walsh; Marianne E. Walsh; Charles M. Collins; Stephanie P. Saari; Jon E. Zufelt; Arthur B. Gelvin; James W. Hug; ENGINEERING RESEARCH AND DEVELOPMENT CENTER HANOVER NH COLD REGIONS RESEARCH AND ENGINEERING LAB
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| Only limited data are available on energetic residues resulting from the firing and detonation of rounds from 120-mm mortars. After a live-fire training exercise at Fort Richardson, Alaska, we sampled a firing point for propellant residues (NG) and the impact area for high-explosives residues (RDX, HMX, and TNT). The firing point was snow-covered soil, and the impact area was snow-covered ice. The total explosives residue mass averaged 19 mg per ... |
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| Prediction of Shallow Footing Settlements on Cohesionless Materials from Seismic Testing |
DEC 2005 |
271 pages |
| Authors:
Andrew J. Sheehan; TEXAS UNIV AT AUSTIN
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| The practice of predicting settlements of shallow foundations has evolved in the past 50 years, but the basic principles and obstacles in making such predictions remain the same. First, the engineer must accurately characterize the soil beneath the proposed foundation. Second, the engineer must choose an analytical technique to model the behavior of that soil under the load. Since settlement, rather than bearing capacity, is most often the controlling design ... |
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| Simulating the Formation and Evolution of Behind Armor Debris Fields |
NOV 2005 |
14 pages |
| Authors:
Stephen J. Schraml; Hubert W. Meyer; David S. Kleponis; Kent D. Kimsey; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
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| The performance of the CTH shock physics code was evaluated on the Opteron cluster recently installed at the U.S. Army Research Laboratory Major Shared Resource Center. Scalability trials were conducted using up to 2048 processors and involved the simulation of the yawed, oblique impact of a long rod penetrator with a thin plate. The scalability of CTH on the Opteron cluster was studied for both fixed and adaptive meshes. After ... |
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