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Institution

Naval Surface Warfare Center

FacilityWashington D.C., District of Columbia, United States
About: Naval Surface Warfare Center is a facility organization based out in Washington D.C., District of Columbia, United States. It is known for research contribution in the topics: Sonar & Radar. The organization has 2855 authors who have published 3697 publications receiving 83518 citations. The organization is also known as: NSWC.


Papers
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Proceedings ArticleDOI
13 Jul 2015
TL;DR: In this article, commercial gallium nitride high-electron mobility transistors are tested at Texas A&M University cyclotron and the degradation of gate and drain currents is characterized.
Abstract: Commercial gallium nitride high-electron mobility transistors are tested at Texas A&M University cyclotron. Degradation of gate and drain currents is characterized.

18 citations

Journal ArticleDOI
TL;DR: In this paper, the general scattering interaction of electromagnetic (EM) pulses of arbitrary shape and duration with a spherical target is studied, where the target is assumed penetrable and can be either totally dielectric, or perfectly conducting but covered with a thin outer masking coating of a dielectoric material.
Abstract: We study the general scattering interaction of electromagnetic (EM) pulses of arbitrary shape and duration with a spherical target The target is assumed penetrable and we model it either as totally dielectric, or as perfectly conducting but covered with a thin outer masking coating of a dielectric material We obtain the radar cross-sections (RCS) of such targets and analyze the many resonance features that are present within their resonance region The dielectric composition makes the resonance features become very prominent and it relates them to the eigenfrequencies in ways analogous to those of the Singularity Expansion Method (SEM), originally developed for perfectly conducting scatterers Transient echoes from these targets are linked to poles and residues in the complex-frequency plane The individual resonances associated with each pole (ie, eigenfrequencies) can be studied one at a time, provided we use long illuminating pulses since these excite transients at their carrier frequencies that ri

18 citations

Proceedings ArticleDOI
01 Dec 2002
TL;DR: In this paper, a new low frequency source technology based on CYMBAL arrays and an unconventionally large vertical receive array is presented that aims to capitalize on structural acoustic features found in targets at low frequencies.
Abstract: A new approach to underwater object identification is presented that aims to capitalize on structural acoustic features found in targets at low frequencies. In order to use these. features for identification purposes, multi-aspect scattering cross-sections must be extracted over a broad range of frequencies. In this paper, we describe a system created to do this. It employs new low frequency source technology based on CYMBAL arrays and an unconventionally large vertical receive array. Data are acquired in a coherent fashion and synthetic apertures are used to extract multi-aspect target scattering cross-sections.

18 citations

Journal ArticleDOI
TL;DR: In this paper, neural networks accurately predicted trends in spray forming process outputs based on variations in process inputs and graphs generated by the neural network prediction help to define the optimal operating region for the Spray forming process and indicate the effect of changing input process parameters on final part quality.
Abstract: ]To produce consistently high-quality spray-formed parts,correlations must be made between the input process parameters and the final part quality The Spray Forming Technology Group at the Naval Surface Warfare Center decided to “model” this correlation through the use of artificial neural networks In this study, neural networks accurately predicted trends in spray forming process outputs based on variations in process inputs The graphs generated by the neural network prediction help to define the optimal operating region for the spray forming process and indicate the effect of changing input process parameters on final part quality

18 citations

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the nature of copper dissolution in overcharged lithium-ion batteries including the relative concentration and chemical state of the copper found in overdischarged batteries through characterization by X-ray photoelectron spectroscopy.
Abstract: In some applications, such as military or back-up energy applications, lithium-ion batteries can undergo storage for multiple years without use. If the batteries are not properly maintained, the pack voltage can decrease over time due to cell self-discharge, battery management system power requirements, and parasitic loads. However, lithium-ion batteries have a recommended discharge voltage limit corresponding to a nominal 0% state of charge, and if discharged below this limit, they will experience an overdischarge condition which can lead to dissolution of the copper current collector and introduce potential safety and performance issues. This paper investigates the nature of copper dissolution in overdischarged lithium-ion batteries including the relative concentration and chemical state of the copper found in overdischarged batteries through characterization by X-ray photoelectron spectroscopy and X-ray absorption fine structure spectroscopy.

18 citations


Authors

Showing all 2860 results

NameH-indexPapersCitations
James A. Yorke10144544101
Edward Ott10166944649
Sokrates T. Pantelides9480637427
J. M. D. Coey8174836364
Celso Grebogi7648822450
David N. Seidman7459523715
Mingzhou Ding6925617098
C. L. Cocke513128185
Hairong Qi503279909
Kevin J. Hemker4923110236
William L. Ditto431937991
Carey E. Priebe434048499
Clifford George412355110
Judith L. Flippen-Anderson402056110
Mortimer J. Kamlet3910812071
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20233
20227
202172
202071
201982
201884