| Nondestructive Inspection (NDI) Facility Radiation Protection Survey for Homestead AFB, FL |
31 Oct 2012 |
23 pages |
| Authors:
Zahid Sulaiman; Samuel Ortiz; Michael Ames; SCHOOL OF AEROSPACE MEDICINE WRIGHT PATTERSON AFB OH
|
 | A radiation protection survey of the shielded NDI facility at Homestead ARB was conducted. The NDI facility used a Lorad LPX-160 x-ray unit for inspections. In addition, a survey of the Class IIIa lasers was included in the assessment. The survey was performed in accordance with T.O. 33B-1-1 and applicable Air Force standards. The NDI facility was recertified as a Shielded Facility. |
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| Lithospheric Models of the Middle East to Improve Seismic Source Parameter Determination/Event Location Accuracy |
Sep 2012 |
10 pages |
| Authors:
Rengin Gok; Stephen Herzog; Keith Nakanishi; Michael E Pasyanos; Rob J Mellors; Arthur J Rodgers; David B Harris; Eileen S Vergino; LAWRENCE LIVERMORE NATIONAL LAB CA
|
| The Middle East is a tectonically complex and seismically active region. The ability to accurately locate earthquakes and other seismic events in this region is complicated by tectonics, the uneven distribution of natural earthquakes and the fact that countries run separate national seismic networks without well-developed data-sharing agreements. We report here on a variety of scientific efforts to enhance knowledge of the lithospheric velocity structure in the Middle East, making ... |
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| One-Pot Synthesis of Conducting Graphene Polymer Composites and Its Strain Sensing Application (Preprint) |
Mar 2012 |
7 pages |
| Authors:
Varrla Eswaraiah; Krishnan Balasubramaniam; Sundara Ramaprabhu; INDIAN INST OF TECHNOLOGY CHENNAI (INDIA)
|
| In-situ reduction of graphite oxide in polymer powder has been implemented using focused solar electromagnetic radiation. Graphene has proved that it can act as alternative filler in nanocomposites due to its high electronic transport properties and its use in advanced polymer composites for EMI shielding applications. With an applied load, strain measured and corresponding change in resistance of the reduced graphite oxide-polymer composites has been observed. The morphological, structural, electrical, ... |
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| Evaluation of Anti-Glare Applications for a Tactical Helmet-Mounted Display |
Mar 2012 |
15 pages |
| Authors:
Jason L Roll; Noel J Trew; Paul Havig; Matthew R Geis; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Non see-through, monocular helmet mounted displays (HMDs) provide warfighters with unprecedented amounts of information at a glance. The US Air Force recognizes their usefulness, and has included such an HMD as part of a kit for ground-based, Battlefield Airmen. Despite their many advantages, non-see-through HMDs occlude a large portion of the visual field when worn as designed, directly in front of the eye. To address this limitation, operators have chosen ... |
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| Multifunctional Composite Nanofibers for Smart Structures |
13 Oct 2011 |
13 pages |
| Authors:
Frank Ko; BRITISH COLUMBIA UNIV VANCOUVER
|
| Encouraged by the successful fabrication and characterization of functional composite nanofibers we proceeded to further optimize the continuous yarn fabrication process and characterize the properties of the yarns from composite nanofibers. With the functional composite nanofiber structures (yarn and nonwoven) characterized we explored the feasibility of integrating these functional composite fibers into electronic devices and higher order structures. To facilitate the formation of complex device shapes the technology of converting ... |
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| Sky Glow from Cities: The Army Illumination Model v2 |
Sep 2011 |
48 pages |
| Authors:
Richard C Shirkey; ARMY RESEARCH LAB WHITE SANDS MISSILE RANGE NM
|
| The increasing number of people living on earth and the corresponding increase in outdoor lighting has resulted in light pollution a brightening night sky that has obliterated the stars for much of the world s population. However, for military purposes, in particular Night Vision Goggle (NVG) users, this light can allow for detection of targets that might ordinarily not be seen. The amount of light scattered from an urban location ... |
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| Transparent Armor Cost Benefit Study |
APR 2008 |
18 pages |
| Authors:
Lisa P. Franks; David Holm; Rick Barnak; ARMY RESEARCH DEVELOPMENT AND ENGINEERING COMMAND WARREN MI
|
| BASIC RESEARCH EFFORT: Goal is to develop nano-structured ceramic bodies with a combination of high optical transmission and exceptional mechanical properties and capable of effective performance in an outstanding transparent armor system. |
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| A Coordination Model for Improving Software System Attack-Tolerance and Survivability in Open Hostile Environments (Postprint) |
FEB 2008 |
20 pages |
| Authors:
Shangping Ren; Yue Yu; Kevin A. Kwiat; Jeffrey Tsai; AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE
|
| This paper presents a coordination model that contains three active entities: actors, roles and coordinators. Actors abstract the system's functionalities while roles and coordinators statically encapsulate coordination constraints and dynamically propagate these constraints among themselves and onto the actors. A software system's attack-tolerance and survivability in open hostile environments are enhanced through appropriate constraint propagations and constraint enforcements. This setting implies that both the coordination constraints and coordination activities are ... |
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| Joint Service Chemical and Biological Defense Program FY 08-09 Overview |
OCT 2007 |
111 pages |
| Authors:
Jean D. Reed; ASSISTANT TO THE SECRETARY OF DEFENSE FOR NUCLEAR AND CHEMICAL AND BIOLOGICAL DEFENSE PROGRAMS WASHINGTON DC
|
| The mission of the U.S. Department of Defense's (DOD) Joint Chemical and Biological Defense Program (CBDP) is to provide chemical and biological defense capabilities in support of the national military strategies. To accomplish this mission, the CBDP works with other federal agencies, state and local governments, Congress, and the private sector. This document provides an overview of the current and future programs that enable our troops to protect themselves and ... |
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| Test and Material Specifications for Dynamic Delamination Studies of Z-Pinned Laminates |
AUG 2007 |
7 pages |
| Authors:
Brian Cox; Christian Lundsgaard-Larsen; Roberta Massabo; TELEDYNE SCIENTIFIC AND IMAGING LLC THOUSAND OAKS CA
|
| We specify tests by which we expect to demonstrate inference from test data of a mixed mode dynamic cohesive law that represents the crack-shielding effects of through-thickness reinforcement (e.g., z-pins) in a laminate. |
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| Development of an Ultralight Pulse Gas Metal ARC Welding System for Shipyard Applications |
27 JUL 2007 |
40 pages |
| Authors:
Neil D. Fichtelberg; GENERAL DYNAMICS GROTON CT ELECTRIC BOAT DIV
|
| A significant cost in shipbuilding is setup during unit erection and outfitting to support welding operations. For small welding jobs such as hanger and tack welding, the labor associated with equipment relocation and setup can be a large part of the total cost of welding. This is primarily due to the need to move large and cumbersome welding equipment and cables through confined structures. As a result, many hangers and ... |
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| Inhibition of Metalloprotease Botulinum Serotype A from a Pseudo-Peptide Binding Mode to a Small Molecule that is Active in Primary Neurons |
16 FEB 2007 |
13 pages |
| Authors:
James C. Burnett; Gordon Ruthel; Christian M. Stegmann; Rekha G. Panchal; Tam L. Nguyen; Ann R. Hermone; Robert G. Stafford; Douglas J. Lane; Tara A. Kenny; Connor F. McGarth; ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD
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| An efficient research strategy integrating empirically-guided, structure-based modeling and chemoinformatics was used to discover potent small molecule inhibitors of the botulinum neurotoxin serotype A light chain. First, a modeled binding mode for inhibitor 2-mercapto-3-phenylpropionyl-RATKML (K(i) = 330 nM) was generated, and required the use of a molecular dynamic conformer of the enzyme displaying the reorientation of surface loops bordering the substrate binding cleft. These flexible loops are conformationally variable in ... |
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| Lithospheric Structure of the Arabian Shield From the Joint Inversion of Receiver Function and Surface-Wave Dispersion Observations |
JAN 2007 |
42 pages |
| Authors:
Robert B. Herrmann; Jordi Julia; Charles J. Ammon; SAINT LOUIS UNIV MO DEPT OF EARTH AND ATMOSPHERIC SCIENCES
|
| We estimate lithospheric velocity structure for the Arabian shield by modeling receiver functions and Love and Rayleigh group velocities from event recorded by the 1995-1997 Saudi Arabian Portable Broadband Deployment. Receiver functions are primarily sensitive to shear-wave velocity contrast and vertical travel times and surface-wave dispersion measurements are sensitive to vertical shear-wave velocity averages, so that their combination bridge resolution gaps associated with each individual data set. We incorporate depth-dependent ... |
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| The 'Defensive Shield' Operation as a Turning Point in Israel's National Security Strategy |
09 MAR 2006 |
25 pages |
| Authors:
Ofek Bouchriss; ARMY WAR COLL LIBRARY CARLISLE BARRACKS PA
|
| The conflict between Israel and the Palestinians had ebbs and flows during the last century. The principle agreement between Israel and the Palestinians signed in 1994 was one of the milestones in that conflict and planted hopes for peaceful end of that conflict. The violent conflict that began in September 2000 was a bitter remainder that the Israeli-Palestinian conflict is far from being solved. This conflict began while the two ... |
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| An Investigation of Bremsstrahlung Reflection in a Dense Plasma Focus Device |
MAR 2006 |
54 pages |
| Authors:
Robert Thomas; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| An overview of Bremsstrahlung radiation, which is prevalent in high-temperature fusion plasmas, is given, as well as estimates for the power and energy flux to a reflector wall from a dense plasma focus device burning p-11B. From these calculations, the wall temperature and ablation rate can be calculated. The physics derived from Inertial Confinement Fusion (ICF) Hohlraum use are applicable in the case where the wall temperature exceeds 105 K, ... |
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| University Nanosat System Thermal Design, Analysis, and Testing |
2006 |
12 pages |
| Authors:
Charlotte Gerhart; AIR FORCE RESEARCH LAB KIRTLAND AFB NM SPACE VEHICLES DIRECTORATE
|
| Thermal design for space systems is an iterative process that balances the temperature requirements for all mission phases with the available resources. Secondary payloads often have to be designed for a wide range of conditions available on various launch platforms, without the benefit of additional resources such as power or thermal shielding. This paper will discuss the thermal design, analysis, and thermal vacuum testing of a small satellite payload that ... |
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| Design and Calibration of a X-Ray Millibeam |
DEC 2005 |
136 pages |
| Authors:
Joseph W. Silvers; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| It has been generally accepted that genetic damage is caused by the deposition of energy within the nucleus of a cell, and the extent of this damage is approximately proportional to the absorbed dose (the linear no-threshold dose-response model). However, recent experiments have shown that genetic alterations, cell death or transformation can occur in cells that receive no direct radiation at all - the so-called bystander effect. The goal of ... |
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| Development and Characterization of Novel Volumetric Acquisition Orbits With an Application Specific Emission Tomograph for Improved Breast Cancer Detection |
AUG 2005 |
31 pages |
| Authors:
Caryl N. Brzymialkiewicz; Martin P. Tornai; DUKE UNIV DURHAM NC
|
| The overall goal of this work is to develop, implement, and evaluate novel three-dimensional acquisition orbits used in conjunction with a dedicated emission mammotomography system, to be used as a potential secondary diagnostic tool. This novel nuclear medicine based molecular imaging technique utilizes camera trajectories that sample a pendant, uncompressed breast, which are evaluated with respect to various breast shapes and sizes. Phantom measurements have demonstrated that lesions near the ... |
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| New Approaches in SPECT Breast Imaging |
JUL 2005 |
24 pages |
| Authors:
Kelly E. Braun; R. Jaszczak; K. Bobkov; J. Bowsher; DUKE UNIV DURHAM NC
|
| The primary objective of this research is to develop new techniques in single photon emission computed tomography (SPECT) breast cancer imaging providing improved detection and characterization of early stage breast cancer. Projection data were acquired by implementing a tiltable SPECT system on a breast and torso phantom. The data were reconstructed with both an ordered subset expectation maximization (OSEM) algorithm and a filtered backprojection (FPP) algorithm with a ramp filter. ... |
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| Real Time Decision Alert, aid and after Action Review System for Combat and Training |
JUN 2005 |
45 pages |
| Authors:
David S. Akin; Geoffrey E. Green; Stephen J. Arntz; Larry L. Meliza; FSCX INC LAWTON OK
|
| The System to Help Identify and Empower Leader Decisions (SHIELD) monitors command, control, communication, computers, and intelligence (C4I) data streams to alert leaders to situations requiring their attention (e.g., units violating a boundary). It allows leaders to temporarily dismiss alerts, have an alert go away for the rest ot a mission, call up recommended courses of action, and/or call up job aids. It captures user responses to alerts in an ... |
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| Low-Frequency EM Field Penetration Through Magnetic and Conducting Cylindrical Shields |
2005 |
5 pages |
| Authors:
Michael A. Morgan; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF ELECTRICAL AND COMPUTER ENGINEERING
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| Computation of low-frequency field penetration through magnetic and/or conducting materials is important for quantifying electromagnetic compatibility issues in devices and facilities, as well as prediction of field signatures external to ships and submarines due to internal electrical machinery. A computational procedure is described for accurately predicting the penetration of low-frequency fields through a cylindrical structure, possibly arranged in layers. The internal source being shielded is a large multi-turn coil having ... |
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| Hypervelocity Impact Analysis of International Space Station Whipple and Enhanced Stuffed Whipple Shields |
DEC 2004 |
299 pages |
| Authors:
Michael E. Kalinski; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The International Space Station (ISS) must be able to withstand the hypervelocity impacts of micrometeoroids and orbital debris that strike its many surfaces. In order to design and implement shielding which will prevent hull penetration or other operational losses, NASA must first model the orbital debris and micrometeoroid environment. Based upon this environment, special multi-stage shields called Whipple and Enhanced Stuffed Whipple Shields are developed and implemented to protect the ... |
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| Isomer Energy Source for Space Propulsion Systems |
MAR 2004 |
136 pages |
| Authors:
Benjamin L. Johnson; ARMY WAR COLL CARLISLE BARRACKS PA
|
| Presented in this work are the results of an investigation of alternative means for powering spacecraft and launch vehicles with energy sources other than chemical combustion. Nuclear thermal propulsion and the energy release of a nuclear spin isomer present potential for increased rocket performance with compact, high-energy fuel sources replacing the combustion engines of the Delta IV-H 1st and 2nd stage vehicles. Analysis of historical fission designs along with the ... |
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| Recent Trend on Application of Piezoactve Polymers to Acoustics |
JUN 2003 |
|
| Authors:
E. Fukada; M. Date; H. Kodama; KOBAYASI INST OF PHYSICAL RESEARCH TOKYO (JAPAN)
|
 | Noble sound shielding system is developed by the combination of a curved piezoelectric polymer film and a negative capacitance circuit. Incident sound produces the in-plane strain and polarization in the piezoelectric film. The charge induced on the electrode by polarization is amplified and fed-back to the electrode. The resulting electric field produces the inverse piezoelectric strain. The strain of the film is thus the sum of the sound-induced strain and ... |
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| Waterway Shielding System and Method |
30 APR 2003 |
40 pages |
| Authors:
Donald H. Steinbrecher; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| A waterway shield system comprises a plurality of autonomous underwater nodes wherein each underwater node comprises acoustic detectors which may comprise horizontal and/or vertical acoustic arrays which may be directly mounted thereto or extend outwardly therefrom. Each underwater node comprises an acoustic modem for transmitting high resolution acoustic data to a gateway node that provides a connection to a surface system and a network of other underwater nodes in other ... |
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| Ammunition Peculiar Equipment (APE) 1995, NIR Propellant Analyzer, to MIL-STD-398, Military Standard Shields, Operational for Ammunition Operations, Criteria for Design of and Tests for Acceptance |
MAR 2003 |
75 pages |
| Authors:
ARMY DEFENSE AMMUNITION CENTER MCALESTER OK VALIDATION ENGINEERING DIV
|
| The U.S. Army Defense Ammunition Center (DAC), Validation Engineering Division (SJMAC-DEV), was tasked by DAC, Maintenance Engineering Division (SJMAC-DEM) to test the Ammunition Peculiar Equipment (APE) 1995 NIR Propellant Analyzer, to MIL-STD-398, "Military Standard Shields, Operational for Ammunition Operations, Criteria for Design of and Tests for Acceptance." The test was conducted with the APE 1995 fully loaded with M1 propellant and placed inside the FOSS 5000 Near Infrared Spectrometer. The ... |
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| The Local Time Dependence of the Anisotropic Solar Cosmic Ray Flux |
2003 |
7 pages |
| Authors:
D. F. Smart; M. A. Shea; AIR FORCE RESEARCH LAB HANSCOM AFB MA
|
| The distribution of the solar cosmic radiation flux over the earth is not uniform, but the result of complex phenomena involving the interplanetary magnetic field, the geomagnetic field and latitude and longitude of locations on the earth. The latitude effect relates to the geomagnetic shield; the longitude effect relates to local time. For anisotropic solar cosmic ray events the maximum particle flux is always along the interplanetary magnetic field direction, ... |
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| Space Weaponization in the 21st Century: A Global Protection Shield |
09 APR 2002 |
|
| Authors:
Bruce C. Townsend; ARMY WAR COLL CARLISLE BARRACKS PA
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| This paper examines the militarization and weaponization of space from 1957 to the present and looks at current threats with a vision towards 2025. The U.S., and the rest of the world, has become irreversibly dependent on space and this dependency has become a critical vulnerability. Several of the threats to our space assets are discussed along with some current and near-term capabilities to counter them. The ethical and legal ... |
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| Evaluation of Magnetic Shields for Instrumented Launch Packages |
JAN 2002 |
24 pages |
| Authors:
S. Levinson; M. Erengll; J. Faust; L. Burke; TEXAS UNIV AT AUSTIN INST FOR ADVANCED TECHNOLOGY
|
| As pan of an investigation to determine the feasibility of HSTSS telemetry techniques in EM launchers, a series of experiments was conducted to evaluate the performance of magnetic shields. The magnetic field was measured at several positions along the bore centerline of the MCL under stationary operation, and comparable EMAP3D calculations were performed. The qualitative agreement between experimental and computational results was very good. Hollow, metallic cylindrical shields were considered ... |
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| X-Ray Shielding Requirements for a Reltron |
OCT 2001 |
24 pages |
| Authors:
Christopher S. Kenyon; ARMY RESEARCH LAB ADELPHI MD
|
| Radiological dose rates from X-rays produced by a reltron (relativistic electron tube) microwave tube are calculated via standard electron-photon Monte Carlo transport software from the Integrated TIGER Series developed by Sandia National Laboratories, Albuquerque, NM. Comparison of an extrapolation of this dose rate for several hypothetical thicknesses of lead shielding surrounding this reltron with the standard maximum worker-allowed radiation level predicts the thickness of lead shielding required in the design ... |
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| Spacecraft Charging: Observations and Relationship to Satellite Anomalies |
01 AUG 2001 |
24 pages |
| Authors:
J. F. Fennell; H. C. Koons; J. L. Roeder; J. B. Blake; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
|
| Many studies have shown that satellite charging can cause anomalies on spacecraft. The SCATHA (Spacecraft Charging AT High Altitude) satellite was flown to determine the conditions and document the existence of satellite charging. It was instrumented to measure charging and to detect electrostatic discharges that occurred. Discharges were observed and could be characterized as either surface or internal charging related. More recently, observations were made of charging on a high-inclination ... |
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| Shielding Considerations for Transient Magnetic Fields Produced by a Pulsed Moving Conductor System |
MAY 2001 |
34 pages |
| Authors:
Alex E. Zielinski; Ira Kohlberg; John Bennett; Calvin D. Le; W. J. Sarjeant; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A model was developed for determining the space and time behavior of the magnetic field external to a system of conductors. A moving conductor is in relative close proximity to a stationary conductor that provides the source current. An additional conductor attenuates the environmental field. The space and time periodicity of the field are related to the parameters of the system. A numerical example predicts the magnitude of the magnetic ... |
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| Investigating UHF Telemetry for Electromagnetic Launchers |
26 APR 2001 |
15 pages |
| Authors:
S. Levinson; L. Burke; M. Erengll; J. Faust; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| This paper describes an experimental investigation of the feasibility of microwave telemetry for conveying diagnostic information collected during and after launch from an electromagnetic (EM) gun. The study focused on extending the Hardened Subminiature Telemetry Sensor Systems (HSTSS) technology for use in EM launch environments. While HSTSS technology has already been successfully demonstrated in high-g, high-pressure launch environments in conventional gun systems, it has not yet been tested in an ... |
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| Laminated Object Manufacturing-Based Design Ceramic Matrix Composites |
APR 2001 |
242 pages |
| Authors:
Raymond Mailunas; NORTHROP GRUMMAN CORP BETHPAGE NY
|
| Tbis report summarizes the significant accomplishments of the Laminated Object Manufacturing Based Design for Ceramic Matrix Composites Program. The overall objective of the twenty-seven month long effort was to further develop LOM based solid freeform fabrication for the rapid design and manufacture of CMC components for DoD applications. Program goals included the development of( 1) a new LOM based design methodology for CMC (2) optimized preceramic polymer CMC material forms ... |
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| The National Shipbuilding Research Program. Emission Factors for Flux Core Rod Used in Gas Shielded Processes |
18 DEC 2000 |
57 pages |
| Authors:
NATIONAL STEEL AND SHIPBUILDING CO SAN DIEGO CA
|
| The shipbuilding and repair industry uses a wide variety of welding rods and wires in combination with various welding processes. These processes include, but are not limited to gas metal arc welding (GMAW), flux core arc welding (FCAW), shielded metal arc welding (SMAW), and submerged arc welding (SAW). There are presently some emission factors for welding operations that have been developed by the United States Environmental Protection Agency (USEPA) and ... |
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| Using Lasers in Space: Laser Orbital Debris Removal and Asteroid Deflection |
DEC 2000 |
35 pages |
| Authors:
Jonathan W. Campbell; AIR UNIV PRESS MAXWELL AFB AL
|
| Orbital debris in tow-Earth orbit ranging in size from 1 to 10 centimeters (cm) in diameter, poses a significant problem for space vehicles. While this debris can he detected, it cannot he tracked with sufficient reliability to permit spacecraft to avoid these objects. Such debris can cause catastrophic damage even to a shielded spacecraft. Given the technological advances associated with adaptive optics, a ground- based pulsed laser could ablate or ... |
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| Mapping Ground-Level Radiation Fields with DREO's Airborne Gamma-Ray Spectrometer |
DEC 2000 |
|
| Authors:
D. S. Haslip; T. Cousins; T. A. Cousins; T. A. Jones; Ph. Bouteilloux; DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
|
| An algorithm is developed and tested that infers a ground contamination pattern from the dose rate patterns measured by DREO's Airborne Gamma-ray Spectrometer. This algorithm is based on a least-squares minimization, and uses Micro shield calculations of dose rates as a function of altitude over a patch of contaminated ground. The algorithm is successful in that it correctly identifies regions of high and low contamination, which would permit a commander ... |
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| Water Bag and Concertainer Detonation Barricades |
SEP 2000 |
52 pages |
| Authors:
John D. Sullivan; John Starkenberg; Jackie L. Brown; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The Defense Ammunition Logistics Agency has a Munitions Survivability Technology (MST) Program for examining different shielding concepts for the field expedient protection of munitions. Recent MST tests showed the effects of a detonating munition stack (Hazard 1.1) on shielded stacks of mixed munitions. In these tests, barricades were formed from water bags or sand-filled Concertainer bins to see if a violent reaction would be prevented ... |
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| Radiation Environment Program (REP) 1992 to 1994 |
SEP 2000 |
61 pages |
| Authors:
Dean C. Kaul; Stephen D. Egbert; SCIENCE APPLICATIONS INTERNATIONAL CORPSAN DIEGO CA
|
| This is a report of radiation transport computations by Science Applications International Corporation (SAIC), under contract to the Defense Special Weapons Agency (DSWA). It describes efforts to verify and validate the MASH shielding system and its associated DABL69 (ENDF/B-V) cross section set. The report describes MASH calculations of free field fluence and kerma intended to match neutron and gamma ray fluence and dose measurements mad at Aberdeen Pulse Radiation Facility ... |
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| Mine Burial in the Surf Zone |
SEP 2000 |
62 pages |
| Authors:
Wayne L. Plager; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| The volumetric rate of scour and burial of a MK-83 mine by waves in the swash and surf zone were measured in two experiments. The beach was near planar with a 1:40 slope and mean grain size of 0.2 mm. The deep water significant wave height was about 2 m with peak periods of 13 sec. An Acoustic Doppler Velocimeter recorded orbital velocities of the waves. ... |
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| Nose Cone and Method for Acoustically Shielding an Underwater Vehicle Sonar Array |
30 NOV 1999 |
|
| Authors:
Neil J. Dubois; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A nose cone for attachment to an underwater vehicle for shielding a sonar array in a nose portion of the vehicle from acoustic pressures in a water environment, the nose cone comprising a tubular body for surrounding side wall portions of the vehicle nose portion, a cap fixed to one end of the nose cone body for overlying a forward-most portion of the vehicle nose portion, and bleed tubes extending ... |
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| Surface-Laminated Piezoelectric-Film Sound Transducer.. |
30 MAR 1999 |
|
| Authors:
Edward F. Downs Jr.; Lynn Haven; OFFICE OF THE SECRETARY OF THE NAVY WASHINGTON DC
|
| A sound transducer, which may be a microphone or a speaker, is constructed using a metallic film sandwich of piezoelectric film as the active element. The sandwich is laminated to a flat inflexible substrate, such as a printed circuit board, over substantially its entire surface area, so that it operates as a transducer without flexing the piezoelectric film. Since the piezoelectric film is less sensitive in this more than when ... |
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| Electrical Outlet Splash Protector |
21 DEC 1998 |
23 pages |
| Authors:
Paul E. Moody; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A splash protector in combination with an electrical outlet includes a shield member having a first shield portion and a second shield portion opposite to the first shield portion. A spring member is provided in connection with the first and second shield portions. An outlet cover includes an outer face with a pair of rectangular slot openings and a grounding pin opening formed therein, and an inner face having a ... |
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| CHAWS Data Processing and Analysis Tools in Real-Time and Postflight Environments |
15 SEP 1998 |
48 pages |
| Authors:
Christopher J. Roth; Nelson A. Bonito; Maurice F. Tautz; Eugene C. Courtney; RADEX INC BEDFORD MA
|
| A number of different programs were used in the collection, calibration, display and analysis of data from the Charged Hazards and Wake Studies (CHAWS). The CHAWS experiment was flown on the Wake Shield Facility satellite during Space Shuttle missions STS-60 and STS-69 for studying plasma interactions with space vehicles and their wake. The programs utilized for the collection of real-time data during the two shuttle ... |
|
| Isolation System for a High Pressure Steam Pipe in a Flooded Structure |
08 SEP 1998 |
15 pages |
| Authors:
Neil J. Dubois; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An acoustic test assembly for testing an underwater vehicle includes a high pressure source joined by a high pressure pipe which extends into a fluid filled testing structure. A vibration shielding flange is joined to the testing structure wall where the flange supports the high pressure pipe. At least one acoustic barrier is positioned around the pipe inside the testing structure to isolate vibrations from the high pressure pipe. In ... |
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| Investigation into the Effects of Underwater Shock Waves on Simple Structures, Shielded and Bare Explosive Materials |
JUN 1998 |
|
| Authors:
Michael Chung; Trevor Kinsey; AERONAUTICAL AND MARITIME RESEARCH LAB MELBOURNE (AUSTRALIA)
|
| The detonation of an underwater charge creates a shock wave and a bubble of gaseous products at high temperature and pressure. At greater ranges, the shock wave and bubble become separated and their effects on structures may be studied separately. However, close to the point of detonation, in the regions typically used for sea-mine neutralisation, the shock wave and bubble lie in close proximity and their ... |
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| Numerical Simulation of Ballistic Limit Curves for Orbital Debris Shielding |
MAY 1998 |
83 pages |
| Authors:
Robert J. Rabb; TEXAS UNIV AT AUSTIN
|
| EXOS is a recently developed particle finite element code well suited to modeling hypervelocity impact phenomena. A series of EXOS simulations were conducted to evaluate the use of this new code for orbital debris shielding design. Two sets of simulations, one for a single bumper Whipple shield and one for a two bumper or stuffed Whipple shield, were compared to well known equations for the ballistic limit of Whipple shields, ... |
|
| The National Shipbuilding Research Program, Development and Evaluation of Improved Flux-Cored Welding Consumables, Phase 1 |
09 JAN 1998 |
36 pages |
| Authors:
NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD
|
| The objective of NSRP Project #7-95-4 is to evaluate and develop an improved flux-cored wire for use in commercial shipbuilding that can be produced within the U.S. and is comparable or exceeds those available from foreign producers. This report deals with a portion of the first phase consisting of evaluating FCAW wires from U.S. and foreign manufacturers to identify the differences in weldability, arc characteristics and quality. The electrode evaluation ... |
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| Fracture Phenomena and Interface Properties of Composites: A FundamentalApproach |
JAN 1998 |
42 pages |
| Authors:
Arif Masud; John Botsis; ILLINOIS UNIV AT CHICAGO DEPT OF CIVIL AND MATERIALS ENGINEERING
|
| This report presents a numerical approach to study the effects of bridging and shielding fibers on reduction in Stress Intensity Factor (SIF) at the crack tip. The variational foundation of the formulation is based on a modified Bu-Washizu variational principle. The crack is assumed to grow in a self-similar manner and an energy approach is undertaken to evaluate SIF at the crack tip. A perfect ... |
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| Battlefield Optical Surveillance System (BOSS) - A HMMWV Mounted System for Non-Lethal Point Defense |
1998 |
9 pages |
| Authors:
W. T. Cooley; Trevor Davis; John Kelly; AIR FORCE RESEARCH LAB KIRTLAND AFB NM
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| As the United States Armed Forces are increasingly asked to control world conflict through humanitarian and peacekeeping missions, non-lethal alternatives for applying force have spurred technologist to identify new methods for engaging potential adversaries. One promising technology comes from advancements in high power (1 to 10 watts) semiconductor lasers, lead by the United States Air Force Research Laboratory, Phillips Research Site. Semiconductor lasers have ... |
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SHIELDING
