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You searched on: Author: David Jacobson

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1. Neutron Radiography Evaluation of Drying in Mortars with and without Shrinkage Reducing Admixtures
Published: 8/3/2015
Authors: Chiara Villani, Catherine Lucero, Dale P Bentz, Daniel S Hussey, David L Jacobson, Jason Weiss
Abstract: Shrinkage Reducing Admixtures (SRAs) are increasingly being used in concrete as a method to minimize shrinkage and restrained shrinkage cracking. SRAs reduce shrinkage by decreasing the surface tension of the pore solution; however, SRAs also impact ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917766

2. Service Life Modeling of Reinforced High Volume Fly ash (HVFA) Concrete Structures Containing Cracks
Published: 5/1/2015
Authors: Scott Z Jones, Dale P Bentz, Kenneth Alan Snyder, Nicos Martys, Daniel S Hussey, David L Jacobson
Abstract: Chloride ions, resulting from the application of de-icing salts travel through the concrete matrix by diffusion in a connected pore network. Cracks in concrete facilitate chloride movement by allowing ions to bypass the concrete matrix and travel ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918183

3. 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

4. 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

5. Demonstration of Achromatic Cold-Neutron Microscope Utilizing Axisymmetric Focusing Mirrors.
Published: 4/21/2013
Authors: Daniel S Hussey, D. Liu, M. V. Gubarev, D Ramsey, David L Jacobson, Muhammad Arif, D. E Moncton, B. Khaykovich
Abstract: An achromatic cold-neutron microscope with magnification 4 is demonstrated. The image-forming optics is made of nested coaxial mirrors of full figures of revolution, so-called Wolter optics. The spatial resolution, field of view, and depth of focus a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913584

6. High-resolution neutron radiography of through-plane liquid water distribution in polymer electrolyte membrane and gas diffusion layer
Published: 8/14/2012
Authors: Daniel S Hussey, David L Jacobson, Richard Fu, Ugur Pasaogullari, Takeshi Shiomi, Yuichiro Tabuchi
Abstract: We re-investigate our previously studied water transport phenomena under nonisothermal conditions by measuring the through-plane liquid water distribution across PEFC components with the state-of-the-art high-resolution neutron radiography. A correc ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911128

7. Neutron Imaging of Lithium Concentration in Battery Pouch Cells
Published: 3/23/2011
Authors: Daniel S Hussey, David L Jacobson, Jason B. Siegel, C. Di Stefan, Xinfan Lin, David Gorsich
Abstract: This paper shows how neutron radiography can be used for in situ quantification of the lithium concentration across battery electrodes, a critical physical system state. The change in lithium concentration between the charged and discharged state ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907528

8. Changing Optical Axis Due To Reactor Operation
Published: 1/12/2011
Authors: Daniel S Hussey, David L Jacobson, Elias M Baltic
Abstract: During reactor operation, the neutron flux distribution is modified by the reactor control mechanisms, in the case of the reactor at the National Institute of Standards and Technology, this is determined by the angular position of the Cd shim arm ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907406

9. WATER TRANSPORT ACROSS A POLYMER ELECTROLYTE MEMBRANE UNDER THERMAL GRADIENTS
Published: 1/11/2011
Authors: David L Jacobson, Richard Fu, Takeshi Shiomi, Ugur Pasaogullari, Joshua Preston, Shinichi Miyazaki, Yuichiro Tabuchi, Daniel S Hussey
Abstract: A fundamental experimental and numerical study of the water transport across a perfluorosulfonic acid (PFSA) membrane under a temperature gradient is presented. The water transport phenomenon was experimentally investigated through water flux mea ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907285

10. Electrically‹stimulated gradients in water and counterion concentrations within electroactive polymer actuators
Published: 2/1/2010
Authors: Jong Keun Park, Paul J. Jones, Chris Sahagun, Kirt A. Page, Daniel S Hussey, David L Jacobson, Sarah E Morgan, Robert B Moore
Abstract: While ionic polymer metal composites (IPMCs) have been studied for more than 10 years, the specific actuation mechanism is still unclear. In this work, neutron imaging, applied potential (AP) and current sensing (CS) atomic force microscopy (AFM) me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903856



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