WorldCat Identities

NAVAL RESEARCH LAB WASHINGTON DC

Overview
Works: 4,931 works in 5,113 publications in 1 language and 5,216 library holdings
Genres: Criticism, interpretation, etc  Poetry 
Classifications: VK1258,
Publication Timeline
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Most widely held works by NAVAL RESEARCH LAB WASHINGTON DC
The Use of Ion Implantation for Materials Processing by F. A Smidt( Book )

7 editions published between 1980 and 1986 in English and held by 7 WorldCat member libraries worldwide

An interdisciplinary program on the use of ion implantation for materials processing is being conducted at NRL. This report describes the important factors in ion implantation science and technology and reports progress in the use of ion implantation to modify friction, wear, fatigue, corrosion, optical and magnetic properties of materials. (Author)
The shock and vibration bulletin by Vibration, and Associated Environments Symposium on Shock( Book )

4 editions published between 1964 and 1965 in English and held by 4 WorldCat member libraries worldwide

This is part 4 of over one hundred papers presented on various aspects of the shock effects, mechanical response, and vibration damping of energy absorbing structures used in launch vehicles, guided missiles, ships, electronics packaging, spacecraft, and other systems subjected to vibration and stress. Specifications of test methods, test results, and monitoring instrumentation are described. Statistical methods for analyzing stress wave data are used, and design criteria for fabricating shock resistant structures are examined from mathematical models. (LS-PL)
The EX-SHADWELL-Full Scale Fire Research and Test Ship( Book )

2 editions published between 1987 and 1988 in English and held by 4 WorldCat member libraries worldwide

The EX-SHADWELL is a decommissioned Land Ship Dock (LSD-15) which is being converted to a damage control test bed. Full scale testing of most facets of damage control can be accomplished on this ship. It will be located at the U.S Coast Guard Fire and Safety Test Detachment, Mobile, Alabama. This report describes the overall general capabilities for the EX-SHADWELL along with supporting documents for developing specific test plan for RDT & E aboard the vessel. (Author)
WAVE PROPAGATION IN SUSPENSIONS by W. S Ament( Book )

1 edition published in 1959 in English and held by 4 WorldCat member libraries worldwide

AIRBORNE OMEGA RECEIVER( Book )

4 editions published between 1960 and 1962 in English and held by 4 WorldCat member libraries worldwide

It is desired that techniques for the Omega navigation system be developed to permit its use in aircraft. Omega utilizes a hyperbolic grid of isophase lines established by VLF transmitters. It is characterized by very long range capability and potentially high accuracy. This third interim report is concerned with progress on the airborne receiver since the second interim report, NRL Memorandum Report No. 1029. (Author)
Metallurgical characteristics of high strength structural materials by R. J Goode( Book )

6 editions published between 1963 and 1967 in English and held by 3 WorldCat member libraries worldwide

The report includes fracture toughness studies on some new titanium alloys as well as results of an initial feasibility study aimed at raising the optimum strength and toughness limits for titanium alloys through an approach involving thick section composites. The results of salt water stress-corrosion- cracking studies on a number of titanium alloys are described including a study concerning the effect of vacuum heat treatment on stress-corrosion-cracking resistance of titanium alloys. Fatigue crack propagation studies in air and in salt water on the pressure vessel steels A302B, A201B, and A517F are discussed; and the results compared to the actual service performance of these same materials in PVRC program studies. Preliminary fracture toughness correlation diagrams are presented for high strength steels based upon fracture mechanics and engineering test methods. The latest versions of the Fracture Toughness Index Diagrams for steels, titanium alloys and aluminum alloys, a usual feature of this report series and which are based upon engineering test methods, are presented and the significance of the features briefly discussed. Fracture toughness studies on thick plates of 5Ni-Cr-Mo-V, and a 'new' 9Ni-4Co steel are reported. In addition, the results are presented for similar studies on welds of 2Mn-2Ni in 5Ni-Cr-Mo-V steels and welds of 9Ni-4Co, 12Ni-3Cr-3Mo and 17Ni- 2Co-3Mo compositions
Shipboard Shock and Navy Devices for Its Simulation( Book )

2 editions published in 1972 in English and held by 3 WorldCat member libraries worldwide

One of the most damaging aspects of the combat environment to which Navy ships are exposed is the mechanical shock resulting from the explosion of warheads. The detonation of a large weapon at a considerable distance from the ship produces a shipboard shock environment throughout the entire ship which is potentially damaging to all shipboard equipment and systems. Information has been accumulated on the characteristics and operation of the devices specified by MIL-S-901 for the shock testing of shipboard equipment--the Navy HI Class Shock Machines and the Floating Shock Platform. Other shock machines are also used by the Navy and other services but are not considered here. This material has been gathered from many sources, most of which are not readily accessible, and is intended to provide background information. Equipments are accepted for shipboard use if they comply satisfactorily with the shock test and design procedures prescribed by MIL-S-901
Bottom Backscattering Measured Off the Southwest Coast of Florida During the Littoral Warfare Advanced Development 99-1 Experiment( Book )

2 editions published in 1999 in English and held by 2 WorldCat member libraries worldwide

Measurements of ocean bottom backscattering were performed in a shallow water environment off the southwest coast of Florida as part of the Littoral Warfare Advanced Development 99-1 Experiment. Scattering strengths were obtained at 1 to 4.5 kHz as a function of grazing angle. Scattering strengths were in the -35 to -45 dB range. The grazing angle dependence could be fit adequately by assuming a dependence of scattering strength on the sine of the grazing angle
A Demonstration of Surveillance-Radar Communication( Book )

3 editions published in 1985 in English and held by 2 WorldCat member libraries worldwide

Success in multiplatform sensor integration will require a robust communication capability for transferring data. One way to communicate is to use the existing radar transmitters and antennas. Consequently, the Naval Research Laboratory (NRL) has investigated techniques for radar communications, and has constructed a simple radar communication demonstration system to illustrate a concept suitable both for new radar designs and for retrofitting onto existing radars
Rapid Geoacoustics Inversion Methods Used in LWAD98-2 Sea Test( Book )

2 editions published in 1999 in English and held by 2 WorldCat member libraries worldwide

A concept for rapid environmental characterization of the sea bottom/subbottom has been successfully tested during the LWAD9S-2 seatest. As a proof-of-concept test, inversion of statistical parameters of a Jackson/Turgut bottomisubbottom scattering model from backscatter data is performed. Seabed geoacoustic properties are also inverted from normal-incidence acoustic data. Results are in agreement with the previously reported geoacoustic data for the area. Iterative time-reversal techniques were also used to improve backscattered signal quality in an engineering trial. All the time-reversal hardware and software components functioned well except for the proper band-pass filtering of the received backscatter signal
Development of a Method for Representing Complex Geometries in a Fire Model( Book )

2 editions published in 1999 in English and held by 2 WorldCat member libraries worldwide

The Consolidated Fire Growth and Smoke Transport (CFAST) model has frequently been used to simulate fires in structures. However, the basic design of the model, combined with historical restrictions on the type and amount of geometrical information which can be entered into the model, place limitations on the accuracy of the model's predictions. These limitations become especially restrictive in the Naval environment due to the inherent complexity of shipboard architecture. This report documents the development of a alternative method for representing such complex geometries. Our approach, called the Structured Architecture for the Fire Environment (SAFE) uses object-oriented data structures to provide a hierarchical and extensible representation. A prototype data entry application has been written to demonstrate the capabilities of the method and, as a proof-of-concept, a portion of the test ship ex-USS SHADWELL has been described using both SAFE and the standard CFAST method
NRL Fact Book( Book )

5 editions published between 1999 and 2008 in English and held by 1 WorldCat member library worldwide

The NRL Fact Book is a reference source for information about the Naval Research Laboratory (NRL). It is updated and placed on NRL's Web site (http://www.nrl.navy.mill) annually. It is printed every other year. To provide additional information to the reader, a point of contact is listed for each activity
Project Vanguard Report No. 9 Progress through September 15, 1956( Book )

18 editions published between 1956 and 1958 in English and held by 1 WorldCat member library worldwide

Contents: The Launching Vehicle (Configuration and Design, propulsion, flight control); The Satellite (Configuration and Design and instrumentation); Theory and Analysis; Electronic Instrumentation (Telemetering, vehicle tracking and range safety); The Minitrack System, Data Processing; (Telemetered data, orbital data and third-stage firing prediction); and Range Operations
Transport Efficiency Studies for Light-Ion Inertial Confinement Fusion( )

1 edition published in 1994 in English and held by 0 WorldCat member libraries worldwide

The proposed Laboratory Microfusion Facility (LMF) will require greater than or equal to 10 MJ of 30 MeV lithium ions to be transported and focused onto high-gain, high-yield inertial confinement fusion targets. The light-ion LMF approach used a multi modular system with individual ion extraction diodes as beam sources. Several transport schemes are being considered to deliver the individual ion beams to the centrally located target. Previous work P.F. Ottinger, D.V. Rose, and C.L. Olson, J. Appl. Phys. 75, 4402 (1994) examined the effect of time-of-flight bunching on energy transport efficiency, eta (t), under realistic constraints on diode operation, beam transport, and packing. Target design considerations suggest that the instantaneous power efficiency, gamma t, be maximized near peak power. Because of time-of-flight bunching, peak power occurs at the end of the power pulse for LMF designs. This work examines the effect of power efficiency running on eta (t) for three transport schemes. Results indicate that tuning the power pulse to maximize gamma t, at about three-quarters through the pulse provides high power efficiency at the end of the pulse while still maintaining high eta (t). In addition to power efficiency tuning, effects on eta (t) from variations of the diode impedance model and the diode voltage waveform are also examined. Light- ion, Inertial confinement fusion
CHARACTERISTICS OF AIR FILTER MEDIA USED FOR MONITORING AIRBORNE RADIOACTIVITY( )

1 edition published in 1964 in English and held by 0 WorldCat member libraries worldwide

A comparison was made of the more important characteristics of the available filter materials which are currently in use by various systems for monitoring airborne radioactivity throughout the world. Most of the materials described are commercially available; the information herein is presented with the hope that it will be of use to those whose programs involve the employment of air-filter media or who require such information for the design of air-filter systems. The filter characteristics measured are such physical properties as tensile strength, thickness, density, ash content, retentivity toward 0.3 micron dioctyl phthalate (DOP) aerosol particles as a function of air velocity, retentivity toward airborne fission products and natural radioactive aerosols (radon daughters) at several air velocities, flow rate as a function of pressure drop across the filter, and the relative rates of clogging by atmospheric dust. The observation of a rapid change in flow with dust loading of some of the filter media suggests the systematic study of such changes as possibly a simple procedure for monitoring the dust content of the atmosphere
Advanced Radiation Theory Support Annual Report 2002, Final Report( )

1 edition published in 2003 in English and held by 0 WorldCat member libraries worldwide

This report describes the work of the Radiation Hydrodynamics Branch during FY 2002 in support of the DTRA PRS Program Critical issues covered are: (1) side-on and end-on x-ray imaging of wire and gas puff implosions, (2) multi-group radiative diffusion, (3) discussions of radiation transport that includes pitfalls inherent to radiation modeling of Z-pinch plasmas, (4) K-shell yield performance assessment of argon loads on DTRA machines, (5) Z-pinch-driven direct drive inertial confinement fusion, (6) Z-scaled K-shell dielectronic recombination rate coefficients, (7) modeling enhanced energy coupling in Z-pinch plasmas, (8) incompressible fluid model for wire array implosions, and (9) increasing K-shell yields by using a low-z gas in the outer shell of a double-puff nozzle
ANALYSIS OF FRICTION TORQUE IN SIMPLE AND PRELOADED SPUR GEAR TRAINS( )

1 edition published in 1965 in English and held by 0 WorldCat member libraries worldwide

The first part of this study develops the relation between the required drive torque and the load torque in a lightly loaded, single gear mesh, considering Coulomb friction between the sliding tooth surfaces. Bearing and windage losses are not considered. All of the load is assumed to be carried on a single pair of teeth, since for lightly loaded gears elastic deflections will be smaller than tooth-to-tooth errors, so that a single pair of teeth may carry the load regardless of the theoretical contact ratio. The use of 'efficiency' formulas given in the literature usually gives low values for starting torque requirements. The second part of the study extends the equations to a four- square gear train as representative of preloaded split gear trains, where friction losses are relatively greater than in simple trains. It is demonstrated that the maximum possible friction loss for a given foursquare gear train would occur when and if the two gear meshes simultaneously begin approach action. It is also demonstrated that the friction loss for a gear train using spring-loaded split gears cannot exceed values calculated on the assumption that one mesh begins approach action while the other mesh terminates recess action
Self-Magnetic Field Effects on Electron Emission as the Critical Current is Approached( )

1 edition published in 2001 in English and held by 0 WorldCat member libraries worldwide

The self-magnetic field associated with the current in a planar diode is shown to reduce electron emission below the Child-Langmuir current density. As the magnetic field increases, the diode current is limited to the critical current. Here, a ID analysis is carried out to calculate the suppressed current density in the presence of a transverse magnetic field. The problem is shown to be similar to that of the limiting current (i.e., Hull current) calculated in a crossed field gap, in which a constant transverse magnetic field is applied across the gap to insulate the electron flow. In the case considered here, the magnetic field is produced by the diode current itself and this self-magnetic field decreases with distance along the gap. It is shown that the emitted current density is only modestly reduced from the Child-Langmuir current density. The 1-D analysis remains valid until critical current is approached, at which point orbit crossing occurs and a 2-D kinetic analysis is required. The minimum diode length required to reach critical current is also derived
In Vivo, Fiberoptic-Coupled Radiation Dose Verification System for Prostate Radiotherapy( )

3 editions published between 1999 and 2001 in English and held by 0 WorldCat member libraries worldwide

A fiberoptic-coupled patient dose verification system has been successfully developed that provides real-time dose rate and total dose information during radiotherapy treatments. The system has up to seven channels that can simultaneously provide dosimetry data at seven locations inside the body, at and near the prostate. The spatial resolution of the dose measurements is less than a millimeter. The fiberoptic-coupled system utilizes novel, optically stimulated luminescence (OSL) glass fiber dosimeters that permit all-optical readout of the total dose and dose rate. The system has been characterized and its performance evaluated in side by side tests with conventional radiation sensors, such as ionization chambers, Si diodes and MOSFET dosimeters. These comparisons were conducted in phantoms and in clinical trials with patients. The characterization experiments included measurement of the dose response, the resistance to radiation damage, the energy dependence of the response, the angular dependence of the response and the dose rate dependence of the response. In every case the fiberoptic-coupled dosimeter provided the correct measurement, often with accuracy to within 1 % of the accepted values. The fiberoptic-coupled OSL dosimeter will enhance the effectiveness of prostate radiotherapy procedures, reduce negative side effects such as death, incontinence and impotence, and improve the quality of life for prostate cancer survivors
Observations of a Geosynchronous Satellite with Optical Interferometry( )

2 editions published between 2008 and 2009 in English and held by 0 WorldCat member libraries worldwide

We report an interferometric detection of an earth-orbiting artificial satellite using optical interferometry. We targeted four geosynchronous communications satellites with the Navy Prototype Optical Interferometer (NPOI) near Flagstaff, AZ, and obtained interferometric fringes on one of them, DIRECTV-9S. We used an east-west 15.9- meter baseline of the NPOI and took data in 16 spectral channels covering the 500-850 nm wavelength range. Observations took place during the "glint season" of 28 February to 3 March 2008, and then again in February- March 2009, when the geometry of the solar panel arrays and the Sun's position creates glints as bright as 2nd magnitude of a few minutes' duration each night. We detected fringes on the satellite at approximately the 2 sigma level on 1 March at magnitude 4.5. Subsequent analysis shows that the fringe amplitudes are consistent with a size scale of 2 meters (50 nanoradians at GEO) in an east-west direction. This detection shows that interferometric detection of satellites at visual wavelengths is possible, and suggests that a multi-baseline interferometer array tailored to the angular size and brightness of geosynchronous satellites could lead to images of these satellites
 
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English (68)