| Structural Mechanics for Adaptive Optics |
26-Jul-2009 |
6 pages |
| Authors:
Daniel J Inman; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG
|
 | The research performed under this grant developed the structural mechanics of an adaptive optic system consisting of a membrane reflective surface stretched over a pressurized cavity. The work presented here starts under the assumption that the quality of optical system is described by Zernike Polynomials and proceeded by coupling the Zernike Polynomials to the membrane dynamics and provide several methods to control the membrane surface and hence the optical quality. ... |
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| Cost and Performance Report for a Zero Valent Iron (ZVI) Treatability Study at Naval Air Station North Island |
31-Jul-2008 |
40 pages |
| Authors:
Arun Gavaskar; Wendy Condit; Mohit Bhargava; BATTELLE MEMORIAL INST COLUMBUS OH
|
| A zero-valent iron (ZVI) pilot treatability study was conducted for the treatment of chlorinated organics (primarily trichlorothylene) in groundwater at Operable Unit 20 at Naval Air Station North Island in 2006. From August 22, 2006 through September 7, 2006, Ferox injection (pressurized injection of water and ZVI powder slurry) was implemented at five locations, between approximately 30 and 60 ft below ground surface. This report summarized the cost and performance ... |
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| Inflatable Causeway (MOSES) Demonstration |
Jul-2008 |
34 pages |
| Authors:
Brenton Mallen; Benjamin Testerman; NAVAL SURFACE WARFARE CENTER CARDEROCK DIV BETHESDA MD SHIP SYSTEMS INTEGRATION AND DESIGN DEPARTMENT
|
| A lightweight, rapidly deployable causeway concept consisting of a pressurized water-filled bag and an air beam supported reservoir has been developed. Small scale prototypes of the bag and air beam systems were tested to demonstrate seakeeping characteristics of the causeway and the capability of the air beams to deploy the system.. The seakeeping tests were focused on roadway motions and the presence of green water on the roadway. |
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| Pulmonary Function Screening of Submarine Personnel Prior to Pressurized Submarine Escape Training: Development of Lung Function Standards |
26 MAR 2007 |
67 pages |
| Authors:
Peter J. Benton; Linda M. Hughes; NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
|
| The US Navy is constructing a 30 ft (9m) submarine escape training tower at Naval Subase New London. Once completed pressurized submarine escape training using the Mk 10 Submarine Escape Immersion Suit (SEIE) will commence. All candidates will undergo medical screening to identify individuals with disqualifying medical conditions. Prior to construction of the new trainer the opportunity was taken to record lung function of students attending the existing submarine escape ... |
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| Fatigue of Ti-3A1-2.5V Alloy Tube and Rod |
28 FEB 2007 |
38 pages |
| Authors:
E. U. Lee; R. E. Taylor; H. C. Sanders; C. Lei; M. Yu; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| The hydraulic impulse fatigue of Ti-3Al-2.5V alloy tube was studied under cyclic hydraulic pressurization and the low cycle fatigue (LCF) of the alloy tube and rod under cyclic axial straining. Employing a newly fabricated test frame, the cyclic-pressurization-induced fatigue crack growth through the tube wall thickness was characterized quantitatively. On the basis of the results, a relationship between electric potential drop and crack depth was established and a method of ... |
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| Final Testing and Evaluation of a Meter-Class Actively Controlled Membrane Mirror (Preprint) |
13 APR 2006 |
15 pages |
| Authors:
Brian Patrick; J. Moore; S. Chodimella; D. Marker; B. deBlonk; SRS TECHNOLOGIES HUNTSVILLE AL
|
| Testing has been completed of a O.7O meter diameter mirror using thin-film polymer membranes. Advances in polymer film science have resulted in polymer membranes less than 24 microns in thickness with excellent surface roughness and sub wavelength thickness variation. The cause of such high quality material production, this has allowed the concept of a lenticular mirror design to be reconsidered. This involves the use of a clear canopy integrated with ... |
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| Geometry Attained by Pressurized Membranes |
2006 |
12 pages |
| Authors:
A. Palisoc; G. Veal; C. Cassapakis; G. Greschik; M. Mikulas; L'GARDE INC TUSTIN CA
|
| An intensive investigation has been carried out to study the surface profiles obtained as a result of the large deformations of pressurized membranes. The study shows that the inflated membrane shapes may have the requisite surface accuracy for use in future large space apertures. Both analytical and experimental work have been carried out. On the analytical side, the classical work of Hencky on flat circular membranes was extended to eliminate ... |
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| Analytic Model Development for Ceramic Gun Tubes |
SEP 2005 |
30 pages |
| Authors:
Robert Carter; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The equations for calculating the probability of failure for an internally pressurized ceramic tube are straightforward and well defined in the literature. The most common solution is for a tube subjected only to an internal pressure. This approach neglects any external pressure, over wrap, or sheathing system that may be used to maintain or promote a beneficial compressive pre-stress. The current research has focused on the development of a model, ... |
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| Design and Ground-Testing of an Inflatable-Rigidizable Structure Experiment in Preparation for Space Flight |
JUN 2005 |
114 pages |
| Authors:
Chad R. Moeller; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| As the demand for larger space structures increases, complications arise including physical dimensions, weight, and launch costs. These constraints have forced the space industry to look for smaller, more lightweight, and cost-effective solutions. Future antennas, solar sails, sun shields, and other structures have the potential to be exponentially larger than their launch envelopes. Current research in this area is focused on the use of inflatable, rigidizable structures to reduce payload ... |
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| Sensitivity of Spores of Eight Bacillus Cereus Strains to Pressure- Induced Germination by Moderate Hydrostatic Pressure, Time and Temperature |
MAR 2005 |
29 pages |
| Authors:
Norasak Kalchayanand; Bibek Ray; C. P. Dunne; Anthony Sikes; WYOMING UNIV LARAMIE DEPT OF ANIMAL SCIENCE
|
| The spores of eight Bacillus cereus strains were pressurized at 138 to 483 MPa for 5 to 20 min at 25 to 70 C in order to determine the sensitive and the resistant strains to pressure-induced germination. The most sensitive strain was B. cereus QMB 476, while the most resistant strain was B. cereus ATCC 11778. Pressurization at 25 C induced spores to germinate ranged from 2.6 to 5.0 log ... |
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| Virginia Trunk Limitations DCS Risk Calculations |
14 FEB 2005 |
13 pages |
| Authors:
P. K. Weathersby; NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
|
| The incremental increase from prior decompression sickness (DCS) risk estimates due to waiting an additional 5 seconds for the escape hatch to fully open is estimated at only 0.1 to 0.3% DCS risk. This estimate applies to 600- foot escapes both from an unpressurized ship with a variety of pressurization profiles, and for the 11 foot (about 1 1/3-atmosphere) saturation case. The increase is clearly minor and well within the ... |
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| Solid Acid Based Fuel Cells |
28 JAN 2005 |
18 pages |
| Authors:
Sossina M. Haile; CALIFORNIA INST OF TECH PASADENA
|
| High power density fuel cells based on solid acid electrolytes have been demonstrated. In particular, a fuel cell with a 25 micron thick CsH2PO4 membrane was fabricated and yielded a power density of 425 mW/cm2 at 26O C (H2/ O2) without pressurization. In this configuration, the thin-film fuel cell is supported on a porous stainless steel gas diffusion layer and the electrocatalyst and electrolyte layers are spray-deposited. In parallel with ... |
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| Magneto-Rheological Fluid Semiactive Suspension System Performance Testing on a Stryker Vehicle |
JAN 2005 |
30 pages |
| Authors:
Andrea C. Wray; Alexander R. Jimenez; Eric Anderfaas; Brian Hopkins; Peter LeNoach; TACOM RESEARCH DEVELOPMENT AND ENGINEERING CENTER WARREN MI
|
| A Magneto-Rheological (MR) Fluid Semiactive Suspension System was tested on a Stryker vehicle, Infantry Carrier Variant (ICV), to determine the performance improvements compared to a standard ICV Stryker vehicle. In January 2005, the testing was conducted at the U.S. Army Yuma Proving Grounds located in Yuma, Arizona. The testing was conducted under the guidance of the U.S. Army Tank-Automotive Research, Development, and Engineering Center (TARDEC) of Warren, Michigan and MillenWorks ... |
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| FLIGHTFAX: Army Aviation Risk-Management Information. Volume 32, Number 12 |
DEC 2004 |
24 pages |
| Authors:
ARMY SAFETY CENTER FORT RUCKER AL
|
| This issue of Flightfax contains the following articles: 1) Cover Story: FY04 Aviation Safety Wrap-up. 2) Investigators' Forum: a) RSOI - The importance of Proper Integration; and b) Good Crew Mix Essential for Mission Success. 3) War Stories: a) Know Your Crew Limits; and b) The Weather Sucked! 4) Smoke in the Cockpit. 5) Don't Ever Do That to My Airplane Again! 6) 2004 Flightfax Index. 7) Accident Briefs. 8) ... |
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| Oscillating Appendage for Fin Propulsion |
13 OCT 2004 |
19 pages |
| Authors:
Thomas J. Gieseke; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An oscillating appendage includes a vessel housing a supply of pressurized fluid with reinforced tubes selectively receiving the pressurized fluid from the vessel, an oscillating valve for controlling the supply of pressurized fluid from the vessel to. the reinforced tubes, and a flexible skin encompassing the vessel, the reinforced tubes, and the valve. The flexible skin defines an outer shape of the oscillating appendage with a tail member affixed at ... |
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| Electromagnetic Modeling of an Adaptable Multimode Microwave Applicator for Polymer Processing |
23 APR 2004 |
7 pages |
| Authors:
Rensheng Sun; Leo C. Kempel; Shuangjie Zhou; Liming Zong; Martin C. Hawley; MICHIGAN STATE UNIV EAST LANSING
|
| Microwaves have been investigated as an attractive alternative (and efficient) energy source to inefficient pressurized ovens for polymer processing. However, industrial use of microwave processing has been impeded by the lack of proper applicator design, modeling, and control/monitoring methods. In this paper, we will briefly talk about conventional multimode applicators, waveguide applicators, and recently developed single-mode applicators. Then we will present the electromagnetic modeling of a novel adaptable multi-feed multimode ... |
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| Vortex-Assisted Pressure Control at Inlet of Underwater Launch System |
21 APR 2004 |
14 pages |
| Authors:
Thomas J. Gieseke; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The present invention relates generally to controlling the flow of a surrounding environmental fluid into an inlet formed in a moving vehicle, and more particularly to a system that uses vortices to control such a flow at the inlet of, for example, an underwater vehicle's underwater launch system. Many underwater launch systems used by underwater vehicles utilize the forward motion of the vehicle and underwater pressure to develop a dynamic ... |
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| Characterization and Ground Test of an Inflatable Rigidizable Space Experiment |
MAR 2004 |
123 pages |
| Authors:
Steven N. Lindemuth; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING AND MANAGEMENT
|
| As greater capability is demanded of space-based assets, their size and complexity are growing. Inflatable, rigidizable structures offer significant improvements in the areas of weight, size, and complexity over traditional mechanically deployed systems. These structures are not well understood and little testing of them has been done in the space environment. Widespread acceptance of these technologies will not be achieved without significant reduction in the risk of using inflatable, rigidizable ... |
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| Investigation of Rapid Pressurization Techniques for the Ram Accelerator |
13 OCT 2003 |
62 pages |
| Authors:
Adam P. Bruckner; Carl Knowlen; UNIV OF WASHINGTON SEATTLE AEROSPACE AND ENERGETICS RESEARCH PROGRAM
|
| This research program demonstrated that flared-cup diaphragms made from polycarbonate can be shot down a smooth bore tube and that they form a tight pressure seal wherever they come to rest. Control of the stopping position was achieved by shooting the cup diaphragm with excess velocity into a tube insert that had serrated ridges formed by cutting annular grooves inside the tube walls. The combination of internal pressurization and spring ... |
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| Detonations of Liquid Oxygen Sprays in Gaseous Hydrogen for Pulse Detonation Rockets |
08 MAY 2003 |
2 pages |
| Authors:
Edward Coy; Jonathan Watts; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Detonations of flowing mixtures of cryogenic gaseous hydrogen and liquid oxygen at mixture densities of 3-6 Kg/cu m and varying liquid oxygen fractions have been studied. Wave speeds, pressures, and the time required to effect detonation-to-deflagration transition are reported. Data taken at cryogenic conditions are compared with data taken at equal initial densities and equivalence ratios, but at ambient temperature, as well as with equilibrium, Chapman-Jouget calculations. This work has ... |
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| Modeling and Simulation of a Health Monitoring System in an Analog Motor |
MAY 2003 |
29 pages |
| Authors:
Tim Miller; Greg Ruderman; AIR FORCE RESEARCH LAB EDWARDS AFB CA PROPULSION DIRECTORATE
|
| Finite element modeling of a cross section of a solid rocket motor is used to determine the relationship between several variables in a health monitoring system. The system consists of pressure sensors mounted on the inner case wall In a pressurized motor, differences among the sensor readings are indicative of crack growth in the propellant The computational data is used to determine the relationship between sensor sensitivity, the number of ... |
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| Design and Testing of Piezoelectric-Hydraulic Actuators |
MAR 2003 |
12 pages |
| Authors:
Jason E. Lindler; Eric H. Anderson; Marc E. Regelbrugge; CSA ENGINEERING INC MOUNTAIN VIEW CA
|
| This paper describes design methodologies for construction of an actuator that uses smart materials to provide hydraulic fluid power. In the class of actuators described, hydraulic fluid decouples the operating frequency of the output cylinder from the drive frequency of the piezoelectric or other smart material. This decoupling allows the piezoelectric to be driven at high frequency, to extract the maximum amount of energy from the material, and the hydraulic ... |
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| Mechanics of Pressurized Plain-Woven Fabric Structures |
14 FEB 2003 |
44 pages |
| Authors:
Paul V. Cavallaro; Matthew E. Johnson; Ali M. Sadegh; NAVAL UNDERSEA WARFARE CENTER DIV NEWPORT RI
|
| Pressurized fabric tubes, pressure-stabilized beams (known as air beams), and air-inflated structures are all considered to be valuable technologies for use in lightweight, rapidly deployable systems. The design optimization of inflated structures, in particular, depends on a thorough understanding of woven-fabric mechanics. With this in mind, the bending response of woven pressure-stabilized beams were experimentally tested and analytically investigated. Additionally, the micromechanical effects of interacting tows were examined through the ... |
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| The Sintering and Densification Behavior of an Iron Nanopowder Characterized by Comparative Methods |
FEB 2003 |
40 pages |
| Authors:
Laszlo J. Kecskes; Robert H. Woodman; Samuel F. Trevino; Bradley R. Klotz; S. G. Hirsch; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Fe nanopowder, derived from microwave plasma synthesis (Materials Modifications Inc., Fairfax, VA), was obtained and characterized for particle size and size distribution. The methods used included static light scattering (SLS) and dynamic light scattering (DLS), surface area and size by Brunauer, Emmett, and Teller (BET) analysis, small angle neutron scattering (SANS), neutron diffraction (ND), x-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM). Based on ... |
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| Sensitivity of Spores to Hydrostatic Pressure: Mechanisms of Activation, Injury and Repair. Phase 1 |
SEP 2002 |
69 pages |
| Authors:
Dallas G. Hoover; Cynthia M. Stewart; Anthony Sikes; C. P. Dunne; DELAWARE UNIV NEWARK
|
| The sensitivity of spores Bacillus subtilis 168 a,id Clostridium sporogenes PA3679 to the effects of pressure (4,000 atmospheres) alone and in combination with nisin, temperature and pH were determined. The results showed that PA3679 spores were more resistant to nisin than B. subtilis 168 but were more sensitive to the combined effects of pressure, elevated temp. and reduced pH. Pressure oscillations of spores' suspensions did not result in a significant ... |
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| Automated Control of Shipboard Ventilation Systems: Phase 2. Part A. Test Results |
31 MAY 2002 |
89 pages |
| Authors:
Bradley J. Havlovick; John T. Yadon; John P. Farley; Frederick W. Williams; NAVAL RESEARCH LAB WASHINGTON DC
|
| A ship's ventilation system is critical to some Damage Control (DC) situations. Smoke and heat management is critical in successful DC operations. Ventilation techniques employed by doctrine vary depending on the overall situation. Two fundamental principles define smoke and heat control: zone pressurization and air flow. Smoke ejection systems have been designed, but not automated into the Advanced Damage Control, Automation. This report describes an initial step in the automation ... |
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| Dynamic Rupture Strength of Lacquer Seal in Flash Tube of 30-mm Ammunition for the M230 Cannon |
MAY 2002 |
22 pages |
| Authors:
Stephen L. Howard; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| The M788, M789, and M799 30 mm ammunition use a flash tube to augment the ignition stimulus of the primer and to provide an ignition source for the propellant bed in each round. The flash tube must be fast acting, provide abundant hot gases/particles, and increase the pressure in the propellant bed sufficiently that the initial burn rate of the propellant in the bed is high enough to propel the ... |
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| Improved Small Device Launch System |
01 OCT 2001 |
19 pages |
| Authors:
Nicholas Bitsakis; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A system for providing pressurized fluid for a small device launch system is shown. The system includes a piston housing an air source aperture, a launcher bore, and a shaft aperture. A piston and piston shaft slide in the chamber with the piston shaft extending out the shaft aperture. A hydraulic control cylinder is connected to the piston shaft and a controller is joined to control the cylinder. In a ... |
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| Study of the Sub- and Supercritical Behavior of Fuel Droplets |
31 AUG 2001 |
57 pages |
| Authors:
Yaw D. Yeboah; CLARK ATLANTA UNIV GA
|
| A study of the droplet gasification and combustion characteristics of hydrocarbon fuel droplets was conducted at sub- and supercritical. The experimental setup provided quiescent and convective environments under supercritical pressure and temperature conditions. The droplet combustion experiment hardware consisted of: a liquid pressurizing and transfer system; a high pressure and temperature combustion chamber; a droplet formation, deployment and ignition system; and a high speed CCD imaging system. The gasification and ... |
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| Pressure Effects and Surface Cracks in a Rubbery Particulate Composite |
04 JUN 2001 |
20 pages |
| Authors:
T. C. Miller; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| Cracks developed during manufacturing, handling and storage of rubbery particulate composites. Previous tests used single edge notched tension (SENT) specimens. In this work, surface cracked specimens are compared with the previous results. Results for ambient and pressurized test conditions are also compared. Pressure affects fracture behavior by suppressing void nucleation, growth, and coalescence. Both initiation of growth and subsequent growth rates are affected. Applying ambient test data can result in ... |
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| Severe Decompression Illness Following Simulated Rescue from a Pressurized Distressed Submarine |
JUN 2001 |
|
| Authors:
M. G. White; E. M. Seddon; G. A. Loveman; K. M. Jurd; S. L. Blogg; DEFENCE EVALUATION AND RESEARCH AGENCY FARNBOROUGH (UNITED KINGDOM) CENTRE FOR HUMAN SCIENCES
|
 | If adequate transfer under pressure or recompression assets were not available after rescue from a pressurized Disabled Submarine the rescuees may stiffer from severe or fatal decompression illness (fDCI). Effective methods of reducing the risk of fDCI require characterization. This study uses a large animal model (goat) to estimate the dose (pressure) response (fDCI) relationship. |
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| A Microfabricated Motor-Compressor for Fuel Cell Applications |
03 MAR 2001 |
18 pages |
| Authors:
A. H. Epstein; L. Frechette; S. Nagle; J. H. Lang; M. A. Schmidt; MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF AERONAUTICS AND ASTRONAUTICS
|
| Technology has been developed for micro electrical and mechanical systems (MEMS) micro motor-compressor and blower devices occupying less than a cubic centimeter. Made with semiconductor manufacturing techniques; these devices are intended for applications such as pressurization for fuel cells in the 50- 150 watt range and the aspiration of analytical instruments. It consists of an integral silicon micro electric motor and centrifugal compressor approximately 4 mm in diameter and 2 ... |
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| Burst Tests of Filament-Wound Graphite-Epoxy Tubes: Pathfinder Test Series for Delta II GEM Motor Cases |
20 DEC 2000 |
51 pages |
| Authors:
D. J. Chang; P. R. Valenzuela; T. V. Albright; AEROSPACE CORP EL SEGUNDO CA LAB OPERATIONS
|
| A test program was conducted to investigate the failure modes of undamaged and damaged graphite-epoxy cylindrical tubes subject to internal pressure, and to simulate the failure mode of the Delta graphite epoxy motor (GEM) case K404. There were two phases of this test program: the mini-test series and the pathfinder series. The mini-test series, using 1.5-in. diameter tubes, included five tests. The pathfinder series, using 4.00-in. diameter tubes, included 41 ... |
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| Accelerated Decompression Using Oxygen for Submarine Rescue - Summary Report and Operational Guidance |
DEC 2000 |
45 pages |
| Authors:
Gary Latson; Edward T. Flynn; Wayne Gerth; Edward Thalmann; NAVY EXPERIMENTAL DIVING UNIT PANAMA CITY FL
|
| In certain situations, a disabled submarine could become internally pressurized due to flooding, leakage of compressed gas supplies, or use of auxiliary breathing systems. This could result in the survivors being saturated with nitrogen at elevated pressures. Efficient submarine rescue requires that pressurized crew members be decompressed more rapidly than current procedures on air allow. NEDU has investigated the ability of oxygen to accelerate decompression following saturation with nitrogen-oxygen. Initial ... |
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| Effect of Hydrostatic Pressure on the Induction and Inactivation of Bacterial Spores Phase 1 |
DEC 2000 |
28 pages |
| Authors:
Norasak Kalchyanand; Bibek Ray; Anthony Sikes; C. P. Dunne; WYOMING UNIV LARAMIE DEPT OF ANIMAL SCIENCE
|
| Destruction of microbial cells and bacterial spores by hydrostatic pressure is being envisioned as a nonthermal novel technique in food preservation. A combination of 50000 psi (345 MPa) at 50C could kill over 6 log cycles of foodborne pathogenic and spoilage bacteria within 5 min. In contrast, even 200,000psi at 80C for 60min will not be able to inactivate important bacterial spores to the same level. However, bacterial spores can ... |
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| Water as a Three-Dimensional Fire-Extinguishing Agent |
OCT 2000 |
36 pages |
| Authors:
Philip J. Peregino II; Anthony E. Finnerty; Robert McGill; Lawrence J. Kieft; Dawnn Saunders; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| It is generally believed that, because of its ability to absorb large quantities of heat, a mist of water droplets would be an excellent fire- extinguishing agent. A device has been constructed to disseminate a high volume of fine droplets of a liquid agent (water) in such a way as to make the liquid droplets permeate an enclosure. This device is capable of dispersing a water mist throughout a volume. ... |
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| Construction and Quantification of a Toroidal Bubble Apparatus |
SEP 2000 |
118 pages |
| Authors:
Allen L. Hobbs; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| A toroidal bubble is a vortex ring with a gas core in a liquid. Current interest in toroidal bubbles is partially due to the discovery that small toroidal bubbles can occur in the cavitation collapse of a spherical bubble near the surface of a solid. This can occur near a propeller blade, causing both damage and acoustic emission. Another motivation is that dolphins generate a ... |
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| Development of High Performance Polymer Fibers Using Subcritical and Supercritical CO2 |
01 MAR 2000 |
6 pages |
| Authors:
Alan J. Lesser; MASSACHUSETTS UNIV AMHERST DEPT OF POLYMER SCIENCE AND ENGINEERING
|
| Enhancements in ballistic protective wear for soldiers rely heavily on the development of lightweight materials with increased moduli and strength. It is well established that an armors ballistic limit can be increased significantly by using materials with increased moduli and strength. The development of high performance fibers from flexible chain polymers has been a subject of intense interest over the past 30 years. However, to ... |
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| Air Supply System Particularly Suited to Remove Contaminants Created by Chemical, Biological or Radiological Conditions |
15 FEB 2000 |
21 pages |
| Authors:
Craig S. LaMoy; Michael A. Pompeii; Charles K. Atwell; W. D. Craig; Bradley A. Repp; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| Disclosed is an air supply system that provides filtered ventilation to a protected zone which is maintained at a positive pressure so as to prevent contaminants from infiltrating therein. The system further discloses a three-stage air filter apparatus that provides all the necessary filtering to remove contaminants from the air that may be created by chemical, biological and radiological conditions. |
|
| Visualization of High-Power Density Diesel Engine Spray and Combustion |
20 DEC 1999 |
292 pages |
| Authors:
M.-c. Lai; N. A. Henein; T.-c. Wang; J.-s. Han; X Xie; WAYNE STATE UNIV DETROIT MI
|
| An experimental visualization study of spray and combustion processes under simulated high-power-density diesel (HPD) combustion conditions is carried out. The scope of work includes characterization of high-pressure injection on test rig, macroscopic and microscopic characterization of non-evaporative sprays in atmosphere ambient condition or in pressurized chamber, and direct visualization of spray and combustion processes inside a single-cylinder optically accessible research engine. The results provide very interesting ... |
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| Passive Airbag Vent Control Valve Study |
DEC 1999 |
82 pages |
| Authors:
Nicholas P. Rosato; ARMY NATICK RESEARCH DEVELOPMENT AND ENGINEERING CENTER MA
|
| The U.S. Army currently uses paper honeycomb material to both dissipate the ground impact energy and to cushion parachute delivered airdropped payload from damage. This report documents exploring the use of pressurized airbags with passively controlled exhaust vents as a means to mitigate ground impact landing shock. The results of both computational and experimental research that examined the performance of passively controlled venting candidates are ... |
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| Waste Aerosol Container Processor |
19 OCT 1999 |
|
| Authors:
David L. Dummer; Jack L. McCrea; Roy J. Maloney; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The invention features implementation of a flat triangular blade which has two cutting edges and a sharp point. The blade is caused to move point wise across a cylindrical can's diameter, with the plane of the blade perpendicular to the can's axis, so that the point pierces the can, the two cutting edges slice through the can in both directions around the can's circumference, and the point again, diametrically oppositely, ... |
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| Breathing Apparatus Having Electrical Power Supply Arrangement With Turbine-Generator Assembly |
19 OCT 1999 |
|
| Authors:
Joseph Rudolph; Robert Hughes; Kenneth Price; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| An electrical power supply arrangement incorporates a turbine-generator assembly providing a self-contained non-battery electrical power source for supplying power to a breathing apparatus. The turbine-generator assembly is interposed in an air hose extending between first and second stage pressure regulators respectively connected to a pressurized air cylinder and to a cooling device of the breathing apparatus. The assembly includes an air turbine and an electrical generator disposed and coupled in ... |
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| Model Validation for High-Power Laser Ignition of JA2 Propellant |
SEP 1999 |
33 pages |
| Authors:
A. Cohen; R. A. Beyer; K. McNesby; A. J. Kotlar; A. Whren; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
|
| A study of JA2 ignition using high-power (3 kW) pulsed Nd: glass lasers at low loading densities was undertaken to help construct models for predicting initial pressurization in bombs at high loading densities. Comparisons were made with results of experiments using a low-power (0.1 kW) continuous wave (cw) CO2 laser. Differences in wavelength dependence of optical properties and time dependence of the laser pulse were considered. Measured infrared (IR) emission ... |
|
| Development of Guidelines for the Prophylactic Treatment of Metastatically Involved Vertebral Bodies |
AUG 1999 |
28 pages |
| Authors:
Cari M. Whyne; Serena Hu; CALIFORNIA UNIV SAN FRANCISCO
|
| Up to 1/3 of all cancer patients develop metastases to the spinal column and over 50% of spinal metastases with neurologic manifestations in females are found to arise from primary breast neoplasms (2). Using a combination of finite element modeling, materials and mechanical testing we aimed to quantify fracture risk in metastatically involved vertebral bodies in order to both understand the mechanism of burst ... |
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| Regulated Gas Source for Underwater Gun Operation |
15 JUN 1999 |
|
| Authors:
Ivan N. Kirschner; Laurence M. Dean; Richard L. Bonin; James E. Mulherin; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| The present invention relates to an underwater weapon having a barrel with an opening through which a projectile is discharged. The weapon further has an apparatus for pressurizing the interior of the barrel to a pressure greater than the ambient pressure to keep water from entering the gun barrel at any point around the circumference of the muzzle opening. The pressurizing apparatus includes a source of gas, a pressure regulator ... |
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| Multi-Cylinder Apparatus for Making Optical Fibers, Process and Product |
04 MAY 1999 |
|
| Authors:
Reza Mossadegh; Jasbinder Sanghera; Ishwar Aggarwal; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A vertically disposed apparatus used to make core-clad optical fibers includes an inner elongated cylinder removably closed at the top and provided at the bottom with an inner exit port of a smaller diameter than the inner cylinder and an outer cylinder, disposed around the inner cylinder removably closed at the top and provided at the bottom with an outer exit port of a smaller diameter than the outer cylinder. ... |
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| Stop Cylinder and Piston Assembly |
06 APR 1999 |
|
| Authors:
Allen C. Powell; DEPARTMENT OF THE NAVY WASHINGTON DC
|
| A stop cylinder and piston assembly has both a firing piston and a piston used for both firing and return located on the same piston rod. The stop cylinder and piston assembly is designed with gas passages so that gas injected for firing purposes through a single aperture in the sidewall of a cylinder is applied to the rear surface of both the firing piston and the piston used for ... |
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| Estimated DCS Risks in Pressurized Submarine Rescue |
APR 1999 |
52 pages |
| Authors:
P. K. Weathersby; S. S. Survanshi; E. C. Parker; D. J. Tample; C. B. Toner; NAVAL MEDICAL RESEARCH CENTER BETHESDA MD
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| The Naval Submarine Medical Research Laboratory (NSMRL) Report "Pressurized submarine rescue: a manual for undersea medical officers" issued in 1992 contained a number of decompression procedures with a conservatism appropriate to routine U.S. Navy diving operations. Current planning emphasizes the need for procedures that, although sub-optimal from some viewpoints, allow maximum efficiency in protecting survivors from life-threatening decompression sickness (DCS). Available probabilistic decompression models were applied to six relevant rescue ... |
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| Multipurpose Water Heater |
MAR 1999 |
45 pages |
| Authors:
Eric C. Guyer; Karl G. Coumou; YANKEE SCIENTIFIC INC MEDFIELD MA
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| This final report describes SBIR Phase II project for the development of a multi-purpose water heater for use in Army Food sanitation centers. The objective of the project was to develop a water heater--powered only by an M2 burner and requiring no external supply of electricity--capable of supplying a continuous flow of pressurized hot water to a faucet at the sanitation sink. In the course of the research, two developments ... |
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