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Author: andrew allen

Displaying records 61 to 69.
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61. 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 ...

62. 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. ...

63. 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 ...

64. 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

65. 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 ...

66. USAXS-Analysis of Electron-Beam Physical Vapour Deposited Thermal Barrier Coatings and Application of Void Structure Modelling to Determine the Influence of Process Parameters on the Thermal Conductivity
Published: Date unknown
Authors: A Flores Renteria, B Saruhan, J Ilavsky, Andrew John Allen

67. Versatile USAXS (Bonse-Hart) Facility for Advanced Materials Research
Published: Date unknown
Authors: J Ilavsky, P Jemain, Andrew John Allen, Gabrielle Gibbs Long
Abstract: The USAXS facility at UNICAT Sector 33 at the Advanced Photon Source (APS) is a world-class resource for advanced materials research emphasizing full-range charactrization of nanometer-scale to micrometer-scale microstructures. Receiving photons from ...

68. Void Populations in Y2O3-Stabilized ZrO2 Coatings Deposited by High Velocity Oxy-Fuel (HVOF) Thermal Spray
Published: Date unknown
Authors: T A Dobbins, Andrew John Allen, J Ilavsky, Gabrielle Gibbs Long, A Kulkarni, H Herman
Abstract: Yttria-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are used to protect turbine rotor and blade components in aircraft and land-based engines from operational temperatures (exceeding 1200 oC). Traditionally, those coatings are deposited ...

69. Volumetric and Size Characterization of Void Morphologies in Thermally Sprayed Metallic Deposits Using Scattering Techniques
Published: Date unknown
Authors: T Keller, W. Wagner, J Ilavsky, Andrew John Allen, N Margadant, S Siegmann, J Pisacka, G Barbezat, R Enzl
Abstract: The complex void microstructure of thermally sprayed deposits may be approximated by three major void syste(interlamellar pores, intralamellar cracks, and volumetric globular voids), each with different volume fractions,anisotropies, sizes and shapes ...

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