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You searched on: Author: kevin coakley

Displaying records 11 to 20 of 66 records.
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11. Stochastic Modeling and Simulation of Marginally Trapped Neutrons
Published: 5/20/2014
Author: Kevin J Coakley
Abstract: For a magnetic trapping experiment, I present an efficient method for simulating experimental beta −decay rates which accounts for loss of marginally trapped neutrons due to wall collisions and other possible loss mechanisms. Monte Carlo estima ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914438

12. Gallium Nitride Nanowire Probe for Near-Field Scanning Microwave Microscopy
Published: 1/15/2014
Authors: Joel C Weber, Paul T Blanchard, Aric Warner Sanders, Atif A. Imtiaz, Thomas M Wallis, Kevin J Coakley, Kristine A Bertness, Pavel Kabos, Norman A Sanford, Victor M. Bright
Abstract: We report on the fabrication of a GaN nanowire probe for near-field scanning microwave microscopy. A single nanowire was Pt-bonded to a commercial Si cantilever prior to evaporation of a Ti/Al coating to provide a microwave signal pathway. Test ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914862

13. Neutron Tomography of a Fuel Cell: Statistical Learning Implementation of a Penalized Likelihood Method
Published: 10/15/2013
Authors: Kevin J Coakley, Dominic F. (Dominic F.) Vecchia, Daniel S Hussey, David L Jacobson
Abstract: At the NIST Neutron Imaging Facility, we collect neutron projection data for both the dry and wet states of a Proton-Exchange-Membrane (PEM) fuel cell. Transmitted neutrons captured in a scintillator doped with Lithium-6 produce scintillation li ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911455

14. Improving quantitative neutron radiography through image restoration
Published: 7/20/2013
Authors: Daniel S Hussey, Elias M Baltic, Kevin J Coakley, David L Jacobson
Abstract: This in-situ study examines the water content in polymer electrolyte fuel cells (PEFCs) using neutron radiography. Various conditions such as different polytetraflouroethylene (PTFE) loadings in the gas diffusion media including the micro-porous laye ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910015

15. Scintillation Yield and Time Dependence from Electronic and Nuclear Recoils in Liquid Neon
Published: 8/13/2012
Authors: Kevin J Coakley, W. H. Lippincott, D. Gastler, E. Kearns, D. N. McKinsey, J. A. Nikkel
Abstract: We have performed measurements of scintillation light in liquid neon, observing a signal yield in our detector as high as (3.5 +/- 0.04) photoelectrons/keV. We measure pulse shape discrimination between electronic and nuclear recoils in liquid neon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909760

16. A near-field scanning microwave microscope for characterization of inhomogeneous photovoltaics
Published: 8/10/2012
Authors: Joel C Weber, Kristine A Bertness, John B. Schlager, Norman A Sanford, Atif A. Imtiaz, Thomas M Wallis, Pavel Kabos, Kevin J Coakley, Victor Bright, Lorelle M. Mansfield
Abstract: We present a near field scanning microwave microscope (NSMM) optimized for imaging photovoltaic samples. Our system incorporates a cut Pt-Ir tip inserted into an open ended coaxial cable to form a weak resonator, allowing the microwave reflection S1 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911168

17. A gamma and X-ray dector for cryogenic, high magnetic field applications
Published: 7/13/2012
Authors: Thomas R Gentile, R L Cooper, R. Alarcon, M J Bales, E J Beise, H Breuer, J. Byrne, T E Chupp, Kevin J Coakley, Maynard S Dewey, Changbo Fu, Hans P Mumm, Jeffrey S Nico, B. O'Neill, K. Pulliam, Alan K Thompson, F E. Wietfeldt
Abstract: As part of an experiment to measure the spectrum of photons emitted in beta-decay of the free neu- tron, we developed and operated a detector consisting of 12 bismuth germanate (BGO) crystals coupled to avalanche photodiodes (APDs). The detector wa ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911584

18. Fast Neutron Detection with Li-6-loaded Liquid Scintillator
Published: 4/12/2011
Authors: David McLarty Gilliam, B Fisher, J N Abdurashitov, Kevin J Coakley, V N Gavrin, Jeffrey S Nico, A A Shikhin, Alan K Thompson, Dominic F. (Dominic F.) Vecchia, V E Yants
Abstract: We report on the development of a fast neutron detector using a liquid scintillator doped with enriched 6Li. The lithium was introduced in the form of an aqueous LiCl micro-emulsion with a di-isopropylnaphthalene based liquid scintillator. A 6Li conc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907289

19. Recent Progress in Noise Thermometry at 505 K and 693 K Using Quantized Voltage Noise Ratio Spectra
Published: 9/6/2010
Authors: Weston Leo Tew, Paul David Dresselhaus, Kevin J Coakley, H Rogalla, D. R White, J Labenski
Abstract: We report on technical advances and new results in noise thermometry at temperatures near the tin freezing point and the zinc freezing point using a Quantized Voltage Noise Source (QVNS). The temperatures are derived in a series of separate measureme ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905427

20. Erratum: Scintillation time dependence and pulse shape discrimination in liquid argon
Published: 3/2/2010
Authors: W. H. Lippincott, Kevin J Coakley, D. Gastler, A. Hime, E. Kearns, D. N. McKinsey, J. A. Nikkel, L.C. Stonehill
Abstract: We have found an error in the code used to perform the multibin method analysis of Sec. III C in which events were compared to a template trace calculated from the wrong photoelectron bin (the index l in Eqs. (14) and (15) did not match the observed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905690



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