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You searched on: Author: Daniel Hussey

Displaying records 1 to 10 of 43 records.
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1. Applications of Neutron Imaging and Future Possibilities
Published: 5/15/2016
Authors: Daniel S Hussey, David L Jacobson
Abstract: Neutron imaging applications exploit the power of neutrons to penetrate through metals and measure small concentrations of hydrogen and lithium with high sensitivity. The recent advances made in digital imaging devices have enabled many novel neutro ...

2. 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 ...

3. Using Neutron Radiography to Quantify Water Transport and the Degree of Saturation in Entrained Air Cement Based Mortar
Published: 8/3/2015
Authors: Catherine Lucero, Dale P Bentz, Daniel S Hussey, David L Jacobson, Jason Weiss
Abstract: Air entrainment is commonly added to concrete to help in reducing the potential for freeze thaw damage. It is hypothesized that the entrained air voids remain unsaturated or partially saturated long after the smaller pores fill with water. Small gel ...

4. A New Cold Neutron Imaging Instrument at NIST
Published: 7/6/2015
Authors: Daniel S Hussey, Christoph Wilhelm Brocker, David L Jacobson, Thomas R Gentile, Wangchun Chen, Elias M Baltic, DV Baxter, J. Doskow, Muhammad Arif
Abstract: The NIST neutron imaging program will build a new imaging instrument in the NCNR guide hall at the end of the neutron guide NG-6, beginning operation in summer of 2014. The NG-6 guide has a spectrum that is strongly peaked at a neutron wavelength of ...

5. 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 ...

6. Neutron Interferometric Measusrement of the Scattering Length Difference Between the Triplet and Singlet States of N-3 He.
Published: 6/4/2014
Authors: Michael G Huber, Muhammad Arif, Wei-Chen N. Chen, Thomas R Gentile, Daniel S Hussey, T C Black, Dimitry A. Pushin, F. E Wiefeldt, C.B Shahi, L Yang
Abstract: We report a new determination of the n-Helium-3 scattering length difference Delta b = (−5.411 ± 0.031 (statistical) ± 0.039 (systematic) ) fm between the triplet and singlet states using a neutron interferometer. This revises our previous res ...

7. 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 ...

8. 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 ...

9. 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 ...

10. 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 ...

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