| Cavity Expansion Experiments with Spherical Explosive Charges in Concrete |
Sep-2009 |
51 pages |
| Authors:
James K Gran; Ehrgott; John Q Jr; J D Cargile; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
|
 | Three experiments were conducted with 1-lb explosive spheres embedded in large concrete cylinders with flatpack stress gages and Dremin loop velocity gages surrounding the charge. In two tests, the charge was far from the boundaries and was fully contained. Radial stresses and velocities attenuated with range by approximately 1/r2.5. In the third test the charge was near the top surface of the concrete cylinder, and reflections perturbed the sphericity of ... |
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| Hurricane Ivan Nearshore Wave Data, Perdido Pass, Alabama |
Aug-2009 |
31 pages |
| Authors:
Margaret A Sabol; James P McKinney; Linda Lillycrop; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| In November 2001, the U.S. Army Engineer District, Mobile, funded the Coastal and Hydraulics Laboratory, U.S. Army Engineer Research and Development Center (ERDC) to deploy a bottom mounted wave gage in 30 ft of water approximately 1 mile offshore of Perdido Pass, AL. On 16 September 2004, Hurricane Ivan made landfall 20 miles west of Perdido Pass as a category 3 hurricane with 120 miles-per-hour maximum winds. The gage was ... |
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| Near-Field Impulse Loading Measurement Techniques for Evaluating Explosive Blast |
Jan-2009 |
14 pages |
| Authors:
Thuvan Piehler; Avi Birk; Richard Benjamin; Eugene Summers; Stephen Aubert; Vincent Boyle; ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD WEAPONS AND MATERIALS RESEARCH DIRECTORATE
|
| Near-field blast loading on a target and the correlation between the charge design and blast impulse were determined and evaluated by using the U.S. Army Research Laboratory (ARL) blast bar gauge and the ARL blast integrator (BI) device. The term near-field refers to a distance less than or equal to ten charge diameters. The pressure-time data used as a measurement of blast loading were obtained using the ARL blast bar ... |
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| Power Distribution System for a Small Unmanned Rotorcraft |
Dec-2008 |
12 pages |
| Authors:
Brian Porter; Gary Haas; ARMY RESEARCH LAB CLEVELAND OH VEHICLE TECHNOLOGY DIRECTORATE
|
| In quest of weight savings, several modifications were made to a Joker model unmanned rotorcraft. Battery power for various subsystems was consolidated in a custom box, and smaller gauge wiring was substituted for the original. The results included a 17% increase in flight time as well as logistics benefits from fewer batteries to be recharged. |
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| Dredged Material Analysis Tools; Performance of Acute and Chronic Sediment Toxicity Methods |
APR 2008 |
73 pages |
| Authors:
Jeffery Steevens; Alan Kennedy; Daniel Farrar; Cory McNemar; Mark R. Reiss; Roy K. Kropp; Jon Doi; Todd Bridges; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS ENVIRONMENTAL LAB
|
| This report and research were supported by the U.S. Army Corps of Engineers New York District and U.S. Environmental Protection Agency Region 2. The work was conducted to provide insight into the potential advantages and disadvantages of using chrome semi toxicity tests with relevant benthic micro invertebrates as part of dredged material evaluations, as described in the Inland and Ocean Testing Mammals (USEPA/USACE 1991, 1998). Nine sediments collected from the ... |
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| Nesting the Gulf of Mexico in Atlantic HYCOM: Oceanographic Processes Generated by Hurricane Ivan |
01-Jan-2008 |
21 pages |
| Authors:
Luis Zamudio; Patrick J Hogan; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS OCEANOGRAPHY DIV
|
| The HYbrid Coordinate Ocean Model (HYCOM) has been configured for the Gulf of Mexico (GOM) at 1/250 horizontal grid resolution and has been nested inside a basin-scale 1/120 Atlantic version of HYCOM. The 1/250 nested GOM model is used to study temperature variations, current patterns, transport variations, and two coastal-trapped waves (CTWs) generated by Hurricane Ivan during mid September 2004. The model results indicate that the winds generated by Ivan: ... |
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| A Determination of Air-Sea Gas Exchange and Upper Ocean Biological Production From Five Noble Gases and Tritiugenic Helium-3 |
SEP 2007 |
|
| Authors:
Rachel H.R Stanley; MASSACHUSETTS INST OF TECH CAMBRIDGE
|
 | The five noble gases (helium, neon, argon, krypton, and xenon) are biologically and chemically inert, making them ideal oceanographic tracers. Additionally, the noble gases have a wide range of solubilities and molecular diffusivities, and thus respond differently to physical forcing. Tritium, an isotope of hydrogen, is useful in tandem with its daughter helium-3 as a tracer for water mass ages. In this thesis, a fourteen month time-series of the five ... |
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| A Compendium of Resistance, Sinkage and Trim, and Longitudinal Wave Cut Measurements Obtained on Model 5365 |
SEP 2007 |
41 pages |
| Authors:
Toby Ratchliffe; Anne Fullerton; James Rice; Don Walker; Lauren Russell; Thomas Fu; DAVID W TAYLOR NAVAL SHIP RESEARCH AND DEVELOPMENT CENTER BETHESDA MD DEPT OF HYDROMECHANICS
|
| Model 5365 is a 1/8.25th scale representation of the R/V Athena. This report documents both a new set of resistance, sinkage and trim, and longitudinal wave cut experiments as well as historical calm water resistance and sinkage and trim data which have been obtained on this model over the past few decades. The new resistance data were obtained in October and November of 2006 on Carriage 2 at the Naval ... |
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| Design of Gages for Direct Skin Friction Measurements in Complex Turbulent Flows with Shock Impingement Compensation |
07 JUN 2007 |
133 pages |
| Authors:
August J. Rolling; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF AEROSPACE AND OCEAN ENGINEERING
|
| This research produced a new class of skin friction gages that measures wall shear even in shock environments. One test specimen separately measured wall shear and variable-pressure induced moment. Through the investigation of available computational modeling methods, techniques for accurately predicting gage physical responses were developed. The culmination of these model combinations was a design optimization procedure. This procedure was applied to three disparate test conditions: 1) short duration, high-enthalpy ... |
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| The Relationship Between Naval Aviation Mishaps and Squadron Maintenance Safety Climate |
DEC 2006 |
95 pages |
| Authors:
Cynthia J. Brittingham; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Naval Aviation has been known for over half a century as being one of the most fascinating professions. Although aircrew may always play a role in the mishap rate, the Navy has shifted its focus to aviation maintenance safety climate as a possible indicator of a future mishap. The School of Aviation Safety developed and implemented a survey, the Maintenance Climate Assessment Survey (MCAS), to assess the safety climate of ... |
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| Testing of 7050-T7451 Aluminum Strain-Life Coupons for a Probabilistic Strain-Life Curve |
02 NOV 2006 |
69 pages |
| Authors:
David T. Rusk; Robert E. Taylor; Paul C. Hoffman; NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD
|
| Fleet life tracking is an integral part of NAVAIR s approach to ensuring the airworthiness and operational readiness of U.S. Naval Aviation assets. Historically, life limits for Naval airframe components have been derived by deterministic analyses of stress-life or strain-life fatigue models. To improve fatigue life prediction capabilities for airframe structures, NAVAIR has begun development of a Probabilistic Strain-Life model. As a first step in the development of the Probabilistic ... |
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| Muzzle Exit (Set Forward) Effects on Projectile Dynamics |
APR 2006 |
14 pages |
| Authors:
D. Carlucci; J. Cordes; S. Morris; R. Gast; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER PICATINNY ARSENAL NJ TECHNICAL RESEARCH CENTER {DUPLICATE#1}
|
| Set forward is a highly dynamic condition that occurs when a projectile exits the muzzle of a weapon. The levels of this acceleration, as well as the frequency, are dependent upon the projectile structural characteristics, length, and muzzle exit pressure. The set forward event can not, in general, be modeled using quasi static techniques. A dynamic analysis must be performed, especially for sensitive electronic components. Proper inspection of critical joints ... |
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| Incident Boundary Conditions for Wave Transformation |
2006 |
13 pages |
| Authors:
Jane M. Smith; Mark B. Gravens; ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS COASTAL AND HYDRAULICS LAB
|
| The nearshore wave transformation model STWAVE is used to transform hindcast wave time histories to the shore to estimate longshore sediment transport rates. These transport rates are used to evaluate engineering design of beach fills and coastal shore protection structures. The boundary conditions used to force STWAVE are typically derived from the Wave Information Studies (WIS) wind-wave hindcast database. In the past, only bulk wave parameters (height, period, and direction) ... |
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| Concept of Operations (CONOPS) for Foreign Language and Speech Translation Technologies in a Coalition Military Environment |
MAR 2005 |
81 pages |
| Authors:
Susan L. Marshall; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF INFORMATIONAL SCIENCES
|
| This thesis presents Concept of Operations (CONOPS) for two specific automated language translation (ALT) devices, the P2 Phraselator and the Voice Response Translator (VRT). The CONOPS for each device are written as Appendix A and Appendix B respectively. The body of the thesis presents a broad introduction to the present state of ALT technology for the reader who is new to the general subject. It pursues this goal by introducing ... |
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| In Situ Evaluation of 3-D Woven Composite Structural Performance Using Fiber Optic Sensors |
28 JAN 2005 |
133 pages |
| Authors:
Alexander E. Bogdanovich; Don Wigent; Thomas J. Whitney; Thomas Wavering; 3TEX INC CARY NC
|
| Report developed under STTR contract for topic AFOOT-0022 describes scientific approaches, engineering solutions and practical results of in situ strain monitoring in 3-D woven composite materials, their bonded and bolted joints using integrated networks of Bragg grating fiber optic sensors. A number of continuous optical fibers carrying hundreds of sensors were integrated into 3-D weaving process simultaneous with the host warp, fill and Z-yarns, and thus became an integral part ... |
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| Calculation of Streamflow Statistics for Ontario and the Great Lakes States |
2005 |
21 pages |
| Authors:
Andrew R. Piggott; Brian P. Neff; GEOLOGICAL SURVEY WASHINGTON DC
|
| Basic, flow-duration, and n-day frequency statistics were calculated for 779 current and historical streamflow gages in Ontario and 3,157 streamflow gages in the Great Lakes states with length-of-record daily mean streamflow data ending on December 31, 2000 and September 30, 2001, respectively. The statistics were determined using the U.S. Geological Survey's SWSTAT and IOWDM, ANNIE, and LIBANNE software and Linux shell and PERL programming that enabled the mass processing of ... |
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| Data for Selected Gaging Stations in the Upper Red River of the North Basin in Minnesota, September 2001 Through September 2003 |
2005 |
94 pages |
| Authors:
William C. Damschen; Rochelle A. Nustad; GEOLOGICAL SURVEY RESTON VA
|
| Surface-water and water-quality data were collected to use in development of upper Red River of the North Basin Total Maximum Daily Loads (TMDLs). This report presents the data that were collected. During September 2001 through September 2003, data were collected at 13 selected gaging stations in the upper Red River of the North Basin. Continuous streamflow data were collected at three of the gaging stations. Water-quality samples were collected at ... |
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| Surface-Water Quality-Assurance Plan for the USGS Georgia Water Science Center |
2005 |
51 pages |
| Authors:
Anthony J. Gotvald; Timothy C. Stamey; GEOLOGICAL SURVEY RESTON VA
|
| The U.S. Geological Survey (USGS), Water Resources Discipline, has a policy that requires each Water Science Center (WSC) to prepare a Surface-Water quality-Assurance Plan. The plan for each WSC describes the policies and procedures that ensure high quality in the collection, processing, analysis, computer storage, and publication of surface-water data. The USGS Georgia Water Science Center (GWSC) Surface-Water Quality-Assurance Plan documents the standards, policies, and procedures used by the GWSC ... |
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| Assured Assembly Infrastructure (AAI) Toolkit |
AUG 2004 |
72 pages |
| Authors:
Nathan Combs; BBNT SOLUTIONS LLC CAMBRIDGE MA
|
| This technical report describes work performed on a project sponsored by DARPA/IPTOs Dynamic Assembly for Systems Adaptability, Dependability, and Assurance (DASADA) Program. Specifically, this project developed the Assured Assembly Infrastructure Toolkit (AAIT) which provides a collection of software and documented techniques to test a uniform assembly model for integrating heterogeneous system components. The AAI Toolkit also explicitly models gauges that measure and drive the dynamic assembly and reconfiguration of the ... |
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| Evaluation of the Wave Absorber at Pentwater, Michigan |
20 JAN 2004 |
12 pages |
| Authors:
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| This discussion compares incident and transferred energy for gages located within the Pentwater, Michigan boat channel. Comparisons are made primarily by examining the differences in the incident and transferred significant wave height, (Hm0). Other comparisons use spectral results. Spectral analysis allows the energy of the total wave record to be broken down into discrete frequency bands. Energy inside and outside the wave absorber may then be compared and a transfer ... |
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| Gauge Symmetry of the N-body Problem in the Hamilton-Jacobi Approach |
12 JAN 2004 |
25 pages |
| Authors:
Michael Efroimsky; Peter Goldreich; NAVAL OBSERVATORY WASHINGTON DC ASTRONOMICAL APPLICATIONS DEPT
|
| In most books the Delannay and Lagrange equations for the orbital elements are derived by the Hamilton-Jacobi method: one begins with the two-body Hamilton equations in spherical coordinates, performs a canonical transformation to the orbital elements, and obtains the Delannay system. A standard trick is then used to generalise the approach to the N-body case. We re-examine this step and demonstrate that it contains an implicit condition which restricts the ... |
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| Fabrication, Metrology and Modeling of Protective Coatings on Metallic MEMS Components |
07 NOV 2003 |
21 pages |
| Authors:
Robert A. Weller; VANDERBILT UNIV NASHVILLE TN
|
| This project provided a proof-of-concept that indium tin oxide (ITO) thin films can be prepared on surfaces by pulsed laser deposition and configured as miniature strain gauges. The degree of piezoresistivity of the films is related to the oxygen content, with larger gauge factors correlated with oxygen excess. Typical gauge factors of order 10 were observed. Gauges as small as 20x 100 microns were fabricated by focused ion beam milling ... |
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| Gauge Freedom in the N-body Problem of Celestial Mechanics |
07 JUL 2003 |
23 pages |
| Authors:
Michael Efroimsky; Peter Goldreich; NAVAL OBSERVATORY WASHINGTON DC ASTRONOMICAL APPLICATIONS DEPT
|
| Whenever a standard system of six planetary equations(in the Lagrange, Delaunay, or other form) is employed, the trajectory resides on a 9(N- 1)-dimensional submanifold of the 12(N-1)-dimensional space spanned by the orbital elements and their time derivatives. The freedom in choosing this submanifold reveals an internal symmetry inherent in the description of the trajectory by orbital elements. This freedom is analogous to the gauge invariance of electrodynamics. In traditional derivations ... |
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| Erosion Modeling of the High Contraction Chromium Plated Crusader Gun System |
JUN 2003 |
36 pages |
| Authors:
S. Sopok; C. Rickard; G. Pflegl; P. O'Hara; S. Dunn; ARMY ARMAMENT RESEARCH DEVELOPMENT AND ENGINEERING CENTER WATERVLIET NY CLOSE COMBAT ARMAMENTS CENTER
|
| Thermal-chemical- mechanical erosion modeling predictions are given for the high contraction chromium plated Crusader gun system based on extensive cannon firing, inspection, characterization, and experimental data. This effort was conducted for the Army's Crusader Program Manager Office and managed by Applied Ordnance Technology. The authors carefully protect proprietary technical data that was provided by various government and nongovernment partners involved in this effort. Key gun system details include the 155-mm ... |
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| Installation Effects on Heat Transfer Measurements for a Turbine Vane |
MAR 2003 |
15 pages |
| Authors:
Marc D. Polanka; Matthew Meininger; Chris R. Joe; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| Experiments have been conducted for a modern high pressure turbine vane in the USAF Turbine Research Facility (TRF). This turbine vane was instrumented with two types of heat flux gauges. The first was a thin film Upilex gauge design wrapped over the full airfoil surface, while the second consisted of Pyrex insert type gauges. Initial measurements showed significant discrepancies in the resultant Nusselt number from these two types of gauges. ... |
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| Tensile Deformation and Fatigue Crack Growth in Bulk Nanocrystalline A1-7.5Mg |
2003 |
6 pages |
| Authors:
P. S. Pao; H. N. Jones; S. J. Gill; C. R. Feng; NAVAL RESEARCH LAB WASHINGTON DC MATERIAL SCIENCE AND TECHNOLOGY DIV
|
| The fatigue crack growth kinetics and tensile deformation of bulk nanocrystalline Al-7.5Mg were investigated. Nanocrystalline particulates were first prepared by mechanically ball milling spray atomized Al-7.5Mg powders in liquid nitrogen. These particulates were then degassed, consolidated by hot isostatic pressing and extruded into rods. Bulk nanocrystalline Al-7.5Mg has significantly higher fatigue crack growth rates and lower fatigue crack growth thresholds than those of ingot-processed 7050-T7451. The fatigue crack growth thresholds ... |
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| Gauge Integration |
SEP 2002 |
63 pages |
| Authors:
Erik O. McInnis; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| It is generally accepted that the Riemann integral is more useful as a pedagogical device for introductory analysis than for advanced mathematics. This is simple because there are many meaningful functions that are not Riemann integrable and the theory of Riemann integration does not contain sufficiently strong convenience theorems. Lebesgue developed his theory of measure and integration to address these shortcomings. His integral is more powerful in the sense that ... |
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| Large Amplitude m = 1 Diocotron Mode Measurements in the Electron Diffusion Gauge Experiment |
24 JUN 2002 |
7 pages |
| Authors:
Thomas G. Jenkins; Kyle A. Morrison; Ronald C. Davidson; Stephen F. Paul; PRINCETON UNIV NJ PLASMA PHYSICS LAB
|
| Smaller-diameter pure electron plasmas are generated in the Electron Diffusion Gauge (EDG) using a thoriated tungsten filament wound into a spiral shape with an outer diameter which is 1/4 of the trap wall diameter. The m = 1 diocotron mode is excited in the plasma by means of the resistive-wall instability, using a resistor-relay circuit which allows the mode to be induced at various initial amplitudes. The dynamics of this ... |
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| M = 1 Diocotron Mode Damping in the Electron Diffusion Gauge (EDG) Experiment |
24 JUN 2002 |
6 pages |
| Authors:
Stephen F. Paul; Kyle A. Morrison; Ronald C. Davidson; Thomas G. Jenkins; PRINCETON UNIV NJ PLASMA PHYSICS LAB
|
| The evolution of the amplitude of the m = 1 diocotron mode is used to measure the background neutral pressure in the Electron Diffusion Gouge (EDG), a Malmberg-Penning trap. Below 5 x 10(exp -8) Torr, the dependence on pressure scales as P(exp 1/4), and is sensitive to pressure changes as small as delta P = 5 x 10(exp -11) Torr. Previous studies on the EDG showed that the diocotron mode ... |
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| Options for Advanced Smoke Control Onboard Ships |
25 MAR 2002 |
29 pages |
| Authors:
Michelle J. Peatross; Frederick W. Williams; NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
|
| The complications posed by smoke disrupt all facets of the damage control (DC) problem onboard ships. Smoke will reduce visibility, which causes disorientation and deterioration of communications among the ship's crew. In turn, the ability of the ship's crew to restore vital ship mission capability will be impeded. In practice, desmoking is generally not implemented until after the fire is under control. With this approach, the benefits gained from minimizing ... |
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| Preliminary Shock Wave Studies in Alumina and Tungsten Carbide |
DEC 2001 |
|
| Authors:
N. K. Bourne; J. C. Millett; CRANFIELD UNIV (UNITED KINGDOM) ROYAL MILITARY COLLEGE OF SCIENCE
|
| The present report describes the results of shock wave investigations conducted to determine shear strengths of two materials: an alumina (Al203), commercially produced by Coors as AD995, and pressure assisted densified tungsten carbide (WC) manufactured by Cercom. In addition, an effort was made to recover shock compressed AD995 in order to determine the change in the initial microstructure of AD995 due to shock and release wave propagation. The shear strength ... |
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| Evaluation of Monopropellants for Reusable Launch Vehicles |
05 NOV 2001 |
3 pages |
| Authors:
Paul F. Jones; Tom W. Hawkins; Adam J. Brand; Milton B. McKay; Stephen L. Rodgers; AIR FORCE RESEARCH LAB EDWARDS AFB CA SPACE AND MISSILE PROPULSION DIV
|
| Previously, the Air Force has been investigating high performance salt-based, liquid monopropellants for low thrust spacecraft applications. The focus of this effort has been on finding a reduced toxicity monopropellant with a predicted density performance impulse greater than 50% over hydrazne. During this same period of time, NASA has been investigating reusable launch vehicle (KLV) concepts and has considered using monopropellants in this application. Anticipating a possible RLV payoff, NASA ... |
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| Bluetooth Technology and Its Implementation in Sensing Devices |
SEP 2001 |
|
| Authors:
Ali M. Aljuaied; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Bluetooth Wireless technology is the world's new short range RF transmission standard for small form factor, low cost, and short-range radio link between portable and desktop devices. This technology does not replace Wireless LANs rather it compliments them. Bluetooth wireless technology has many advantages over other Wireless LAN technologies, which makes it attractive to many applications. One such application is in the area of sensors and gauges on- board ships ... |
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| Experimental Study of Plasma-Propellant Interactions |
19 JUN 2001 |
4 pages |
| Authors:
Stefan T. Thynell; Thomas A. Litzinger; PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL AND NUCLEAR ENGINEERING
|
| The use of a plasma as an ignition source has revealed several attractive benefits over conventional igniter systems, such as a shorter ignition delay, reduced temperature sensitivity of the propellant, better controlled propellant mass generation rates, and reduced susceptibility to anomalous ignition transients. However, the causes of these attractive benefits at a fundamental level are not well understood. To address the issues in this experimental program, different diagnostic tools are ... |
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| Shipboard Wireless Network Applications |
JUN 2001 |
125 pages |
| Authors:
Tung T. Ly; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| Recently, the need to leverage technologies for better utilizing valuable personnel resources has become more important Wireless Local Area Networks (WLANs) have been shown to be an enabling technology that allows companies in commercial industry to become more productive Research has been conducted at the Naval Postgraduate School to determine how this technology can be utilized to help the Navy perform shipboard operations more efficiently. Continuing the work of previous ... |
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| High Resolution Convective Heat Transfer Measurements |
30 MAY 2001 |
48 pages |
| Authors:
Peter Ireland; Terry Jones; OXFORD UNIV (UNITED KINGDOM) DEPT OF ENGINEERING SCIENCE
|
| This briefing addresses: 1) High resolution htc measurements using temperature sensitive liquid crystals; 2) Need for high resolution htc data; 3) Sealing strategy; 4) Liquid crystal instrument features; 5) Application and test details; 6) Example applications new developments; 7) Thin film gauges; 8) Instrument details and recent developments; 9) Applications; 10) High density platinum gauges. |
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| Visual Characterization of Wear in Large Caliber Weapons |
26 APR 2001 |
10 pages |
| Authors:
Dominick Salafia; ARMY MATERIEL TEST CENTER YUMA PROVING GROUND AZ METROLOGY AND SIMULATION DIV
|
| As part of the Army Test and Evaluation Command (ATEC) the Metrology and Simulation Division at the U.S. Army Yuma Proving Ground (USAYPG) has the mission to measure and record the detrimental effects of firing conventional and experimental munitions on large caliber cannon tubes. The primary objective is to ensure that the weapon to be fired will safely meet mission requirements for the quantity and energy of the munitions under ... |
|
| Film Cooling Visualization and Heat Transfer on Transonic Turbine Blades |
MAR 2001 |
66 pages |
| Authors:
Thomas E. Diller; VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF MECHANICAL ENGINEERING
|
| This study is an investigation of the film cooling effectiveness and heat transfer coefficient of a two-dimensional turbine rotor blade in a linear transonic cascade. Experiments were performed in Virginia Tech's Cascade Wind Tunnel with an exit Mach number of 1.2 and an exit Reynolds number of 5 x 10 (exp 6) to simulate real engine flow conditions. The freestream and coolant flows were maintained at a total temperature ratio ... |
|
| Aerial Coercion: Why Did It Fail Against Saddam and Succeed Against Slobodan |
05 FEB 2001 |
26 pages |
| Authors:
Robert Campbell; NAVAL WAR COLL NEWPORT RI
|
| As a result of air power played in Desert Storm and Operation Allied Force, a new term, aerial coercion has entered the military lexicon. Aerial coercion involves a major air operation to paralyze or decapitate an adversary using strikes against strategic targets like national level command and control sites, punish him by striking the state's economic infrastructure, or to deny his military strategy through strikes on operational targets like fielded ... |
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| Long Gage Fiber Optic Bragg Grating Strain Sensors to Monitor Civil Structures |
2001 |
11 pages |
| Authors:
Whitten L. Schulz; Joel P. Conte; Eric Udd; BLUE ROAD RESEARCH FAIRVIEW OR
|
| Fiber optic Bragg gratings packaged in long gage configurations are being used to measure static and dynamic macro-strains in structures and structural models to monitor structural health and detect and identify macro- damage incurred from a seismic event. These long gage sensors are being used to experimentally verify analytical models of small-scale structural models in their pre- and post-damage states using system identification techniques. This fiber optic deformation measurement system ... |
|
| F-5 CFD Results |
01 OCT 2000 |
|
| Authors:
BRITISH AEROSPACE OPERATIONS LTD BROUGH(UNITED KINGDOM) MILITARY AIRCRAFT AND AEROSTRUCTURES
|
| The F-5 test series (see chapter 5) provides a succession of geometries of increasing complexity Ref. 1 Ref. 2, which will he useful for validating CFD codes during their development. In this chapter a range of CFD results are provided for the clean wing configuration at selected flow conditions, and a more limited set for one complex configuration. Results from essentially slate of the art UTSP (Unsteady Transonic Small Perturbation), ... |
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| Geomorphological Channel and Bank Assessment of the Missouri River - Fort Peck Dam to Ponca State Park |
SEP 2000 |
214 pages |
| Authors:
Chris Bromley; Colin Thorne; Chester Watson; NOTTINGHAM UNIV (UNITED KINGDOM) DEPT OF GEOGRAPHY
|
| The PI, co-PI and a team from WES spent a five-day period reconnoitering the four study reaches in order to become familiar with the banks and the in-channel morphology of the river. As a result of this, a short report recommending an approach to the study was written by the PI and sent to staff at WES. It was recommended that geomorphologically distinct subreaches be identified within each of the ... |
|
| Special Flood Hazard Evaluation Report, Tonawanda Creek, Village of Attica, Wyoming County, New York |
MAR 2000 |
50 pages |
| Authors:
CORPS OF ENGINEERS BUFFALO NY BUFFALO DISTRICT
|
| This report presents local flood hazard information for Tonawanda Creek in the Village of Attica, New York. The U.S. Army Corps of Engineers, Buffalo District will provide interpretation in the application of the data contained in this report, particularly as to its use in developing effective flood plain regulations. Changes in hydrology and hydraulics reflected in this study are the results of a more detailed ... |
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| Static and Dynamic Testing of Bridges and Highways Using Long-Gage Fiber Bragg Grating Based Strain Sensors |
2000 |
9 pages |
| Authors:
Whitten L. Schulz; Joel P. Conte; Eric Udd; John M. Seim; BLUE ROAD RESEARCH FAIRVIEW OR
|
| Fiber optic Bragg gratings packaged in long gage configurations are being used to measure static and dynamic strain in structures and structural models to monitor structural health and predict damage incurred from a seismic event. These long gage sensors are being used to experimentally verify analytical models of post-earthquake evaluation based on system identification analysis. This fiber optic deformation measurement system could play a significant role in monitoring/recording with a ... |
|
| Ponce de Leon Inlet, Florida, Site Investigation Report 1, Selected Portions of Long-Term Measurements, 1995-1997 |
JAN 1999 |
189 pages |
| Authors:
David B. King Jr; Jane M. Smith; Adele Militello; Donald K. Stauble; Terry N. Waller; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
|
| The U.S. Army Corps of Engineers, Coastal Inlets Research Program, conducted a long-term comprehensive monitoring program at Ponce de Leon Inlet, Florida, beginning in September 1995 and ending in October 1997. The monitoring program consisted of multiple gauge sites to collect data on wave height, wave period, wave direction, water level, current velocity, and wind velocity. Additional data were obtained through bathymetry surveys, the collection ... |
|
| Effects of Strain Rate and Moisture on the Tensile Strength of Heterogeneous Materials |
FEB 1998 |
50 pages |
| Authors:
C. A. Ross; FLORIDA UNIV SHALIMAR GRADUATE ENGINEERING AND RESEARCH CENTER
|
| Strain rate effects on tensile strength of concrete and mortar were investigated using three different size specimens, two different sized split Hopkinson pressure bars (SHPB) and a standard material test machine. All combinations of data show the same trend of abrupt increases in tensile strength at a strain rate of about 1.0/sec. An analytical expression end an empirical relation for concrete tensile strength are presented as ... |
|
| Soil-Embedded and Oil-Immersed Soil Stress Gage Calibration Tests |
NOV 97 |
326 pages |
| Authors:
Walton C. Dickson; Jon E. Windham; ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS STRUCTURES LAB
|
| Soil stress measurements are used to determine or deduce many aspects of high-explosive (HE) tests; hence, accurate calibrations of soil stress gages are essential to proper interpretation of test events. The soil stress gages typically used in HE tests are currently calibrated hydrostatically. The result of a hydrostatic is linear for both loading and unloading. But soils do not typically behave as linear elastic materials, i.e., soil stress-strain behavior calibration ... |
|
| Experimental Determination of Transfer Functions for a Coated, Ring Stiffened Cylinder as a Function of Hydrostatic Pressure |
JUN 97 |
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| Authors:
Robert H. Meyer; MASSACHUSETTS INST OF TECH CAMBRIDGE
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| Coating effectiveness, as measured by the change in a ring stiffened cylinder's transfer function, is experimentally determined in the acoustic far field for increasing hydrostatic pressure. Polymer coating response characteristics are a function of temperature, frequency, molecular structure, chemical crosslinking systems and fillers. A sample coating, of unknown composition, is provided for analysis to gage performance as a function of frequency and filler (indirectly through hydrostatic pressure). Limited instrumentation assets ... |
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| Drug Control: Reauthorization of the Office of National Drug Control Policy |
MAY 97 |
13 pages |
| Authors:
GENERAL ACCOUNTING OFFICE WASHINGTON DC GENERAL GOVERNMENT DIV
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| Over the years, GAO has issued numerous reports on the nation's drug control efforts. These reports show a consistent theme: the nation's effort to control illegal drugs is complex, fragmented among many agencies, and hindered by the absence of meaningful performance measures to gauge progress and to guide decisionmaking to better ensure that limited resources are put to the best use. In 1983, GAO concluded that there was a need ... |
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| Water Resources Data - Wisconsin, Water Year 1996 |
APR 97 |
488 pages |
| Authors:
B. K. Holmstrom; D. L. Olson; B. R. Ellefson; GEOLOGICAL SURVEY MADISON WI WATER RESOURCES DIV
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| Water-resources data for the 1996 water year for Wisconsin include records of streamflow at gaging stations, partial-record stations, and miscellaneous sites, records of precipitation, and records of chemical, biological, and physical characteristics of surface water. In addition, water levels in observation wells are reported. These data were collected by the U.S. Geological Survey in cooperation with State and local agencies and other Federal agencies in Wisconsin. |
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Reports by Keyword(s)
GAGES
