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You searched on: Author: andrew allen

Displaying records 61 to 70 of 74 records.
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61. The Role of Feedstock Particle Size on the Microstructural Behavior of Plasma-Sprayed YSZ Deposits During Annealing
Published: 3/1/1999
Authors: H Boukari, Andrew John Allen, Gabrielle Gibbs Long, J Ilavsky, Jay S Wallace, C C Berndt, H Herman
Abstract: We have studied the microstructure of thick plasma-sprayed yttrium-stabilized zirconia deposits fabricated from different initial feedstock particle size (32, 47, 56 and 88) m in a series of mulitiple and Porod small-angle neutron scattering experim ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850247

62. The Surface Area of Cement Paste as Measured by Neutron Scattering -- Evidence for Two C-S-H Morphologies
Published: 10/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Small-angle neutron scattering was used to measure the effect of water-to-cement ratio [w/c] and cement batch variation on the surface area of ordinary Portland cement [opc] paste after hydration for 28 days at room temperature, and to measure the de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850156

63. Multiple Small-Angle Neutron Scattering
Published: 9/1/1998
Authors: Gabrielle Gibbs Long, Susan Krueger, Andrew John Allen
Abstract: Over the past decade, a multiple small-angle neutron scattering (MSANS) formalism has been developed to enable researchers to derive microstructural parameters from multiply-scattered small-angle neutron data. The MSANS formalism is particularly use ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850569

64. Determination of the Neutron Scattering Contrast of Hydrated Portland Cement Paste Using H^d2^0/D^d2^0
Published: 6/1/1998
Authors: J Thomas, Hamlin M Jennings, Andrew John Allen
Abstract: Accurate measurements of the surface area of cement based materials using small-angle neutron scattering (SANS) require determination of the neutron scattering contrast between the C-S-H gel and H6d2^O. Because the C-S-H gel has a poorly understood ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850238

65. Anisotropic Microstructure of Plasma-Sprayed Deposits
Published: 4/1/1998
Authors: J Ilavsky, Gabrielle Gibbs Long, Andrew John Allen, L Leblanc, M Prystay, C Moreau, Alan H Band
Abstract: The microstructure of plasma-sprayed deposits [PSD] is dominated by two void systems-interlamellar pores and intralamellar cracks - each with a different anisotropy. Varying anisotropies and crack-to-pore ratios within PSDs are responsible for the a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850157

66. USAXS Studies of Silica Fume Additives in Cements and Concrete
Published: 4/1/1998
Authors: Andrew John Allen, Richard A Livingston
Abstract: Supplementary cementitious materials like silica fume, which are added to the cement mix and react with calcium ions in the pore solution, enhance the production of calcium-silicate-hydrate gel and modify the microstructure in other ways. By combinin ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850197

67. Evolution of the Microstructure of Plasma-Sprayed Deposits During Heating
Published: 1/1/1998
Authors: Gabrielle Gibbs Long, Andrew John Allen, J Ilavsky
Abstract: The evolution of the void microstructure of yttria-stabilized zirconia [YSZ] plasma-sprayed deposits [PSD] was studied as a function of heating in air from room temperature to 1400 C, and during a constant temperature hold at 1100 C for 19 hours. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850158

68. Advanced Neutron and X-Ray Techniques for Insights Into the Microstructure of EB-PVD Thermal Barrier Coatings
Published: Date unknown
Authors: A Kulkarni, A N Goland, H Herman, Andrew John Allen, T A Dobbins, F DeCarlo, J Ilavsky, S Fang, P Lawton
Abstract: The ongoing quest to increase gas turbine efficiency and performance (increased thrust) provides a driving force for materials development. While improved engine and usage of novel materials provide solutions for increased engine operating temperatur ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850843

69. Characterization of Solid Oxide Fuel Cell Layers by Computed X-Ray Microtomography and Small-Angle Scattering
Published: Date unknown
Authors: Andrew John Allen, T A Dobbins, J Ilavsky, F Zhao, A Virkar, J Almer, F DeCarlo
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=850784

70. Microstructural Control and Alignment of Template-Synthesized Gold Nanowires in Suspension
Published: Date unknown
Authors: Andrew John Allen, Vincent A Hackley, R Liu, S B Lee, Jan Ilavsky
Abstract: We use ultrasmall-angle X-ray scattering to measure the diameter size distributions of Au nanowires in suspension. Au nanowires are synthesized by electrodeposition in a well-ordered alumina template. The diameter distribution is quantitatively corr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=851097



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