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Displaying records 11 to 20 of 239 records.
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11. Considerations for Design and In-Situ Calibration of High Accuracy Length Artifacts for Field Testing of Laser Trackers
Topic: Environment/Climate
Published: 3/1/2015
Authors: Aaron Hudlemeyer, Daniel S Sawyer, Christopher J Blackburn, Vincent D Lee, Mark Meuret, Craig M Shakarji
Abstract: Interim testing of laser trackers can be problematic due to the lack of high precision, long length artifacts that maintain their calibrated lengths during measurement. Gravitational loading, fixturing forces, and changes in the atmospheric conditio ...

12. Biomass Particle Models with Realistic Morphology and Resolved Microstructure for Simulations of Intraparticle Transport Phenomena
Topic: Environment/Climate
Published: 12/9/2014
Authors: Peter Ciesielski, Michael F Crowley, M R Nimlos, Aric Warner Sanders, Gavin Wiggins, Bryon Donohoe
Abstract: Biomass exhibits a complex microstructure of directional pores that can vary substantially between species of origin. However, models of biomass particles employed in simulations of conversion processes typically employ over-simplified geometry such ...

13. Principles of Optical Radiometry and Measurement Uncertainty
Topic: Environment/Climate
Published: 11/27/2014
Authors: Bettye C Johnson, Howard W Yoon, Joseph Paul Rice, Albert C Parr
Abstract: The fundamental concepts of optical radiometry are developed from basic principles, with detailed explanations for radiance, irradiance, and reflectance. Examples of radiometric standards, in particular radiometers and reference sources are given, an ...

14. A pilot interlaboratory comparison of protocols that simulate aging of nanocomposites and detect released fragments
Topic: Environment/Climate
Published: 10/1/2014
Authors: Wendel Wohlleben, Deborah L Stanley, Justin M Gorham, Li Piin Sung, Tinh Nguyen
Abstract: The safe use of nanocomposites depends, in part, on a good understanding of the fate of nanofillers throughout the nanocomposite,s lifecycle. Various modifications of ISO weathering protocols have been proposed to assess what is released and at which ...

15. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Environment/Climate
Published: 7/23/2014
Authors: Nathan D Orloff, Jan Obrzut, Christian John Long, Thomas F. Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. ...

16. Effects of Temperature on Surface Accumulation and Release of Silica Nanoparticles in an Epoxy Nanocoating Exposed to UV Radiation
Topic: Environment/Climate
Published: 6/16/2014
Authors: Chun-Chieh Tien, Ching-Hsuan Chang, Bernard Hao-Chih Liu, Deborah L Stanley, Savelas A Rabb, Lee Lijian Yu, Tinh Nguyen, Li Piin Sung
Abstract: Polymer nanocoatings are increasingly used outdoors and in harsh environments. However, because most common polymers degraded by the weathering elements, nanoparticles in polymer nanocoatings may be released into the environments. Such nanoparticle r ...

17. Low carrier density epitaxial graphene devices on SiC
Topic: Environment/Climate
Published: 6/1/2014
Authors: Yanfei Yang, Lung-I Huang, Yasuhiro Fukuyama, Fan-Hung Liu, Mariano Real, Paola Barbara, Chi-Te Liang, David B Newell, Randolph E Elmquist
Abstract: Monolayer epitaxial graphene grown on a hexagonal silicon carbide (SiC) substrate is typically found to be heavily n-doped (~10e13 cm-2) and in most devices made with the as-grown epitaxial graphene the quantized Hall resistance plateau with Landau l ...

18. Optical volumetric inspection of sub-20 nm patterned defects with wafer noise
Topic: Environment/Climate
Published: 4/2/2014
Authors: Bryan M Barnes, Francois R. Goasmat, Martin Y Sohn, Hui Zhou, Richard M Silver, Andras Vladar, Abraham Arceo
Abstract: We have previously introduced a new data analysis method that more thoroughly utilizes scattered optical intensity data collected during defect inspection using bright-field microscopy. This volumetric approach allows conversion of focus resolved 2-D ...

19. Rapid Growing Clay Coatings to Ruduce the Fire Threat of Furniture
Topic: Environment/Climate
Published: 1/14/2014
Authors: Yeon Seok Kim, Yu-Chin Li, William M Pitts, Rick D Davis

20. Corrosion Detection in Concrete Rebars Using a Spectroscopic Technique
Topic: Environment/Climate
Published: 1/11/2014
Authors: Edward Joseph Garboczi, Paul E Stutzman, Shuangzhen S. Wang, Nicos Martys, Dat Duthinh, Virgil Provenzano, Shin G. Chou, David F Plusquellic, Jack T Surek, Sung Kim, Robert D McMichael, Mark D Stiles, Ahmed M. Hassan
Abstract: Detecting the early corrosion of steel in reinforced concrete is a goal that has been much pursued. Since 2010, NIST has been working on a large project to develop an electromagnetic (EM) probe that detects the actual corrosion products via spectrosc ...

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