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You searched on: Topic Area: Environment/Climate

Displaying records 1 to 10 of 229 records.
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1. Characterizing intimate mixtures of materials in hyperspectral imagery with albedo-based and kernel-based approaches
Topic: Environment/Climate
Published: 9/1/2015
Authors: Robert S Rand, David W Allen, Ronald Resmini
Abstract: Linear mixtures of materials in a scene often occur because the pixel size of a sensor is relatively large and consequently they contain patches of different materials within them. This type of mixing can be thought of as areal mixing and modeled by ...

2. Critical current and linewidth reduction in spin-torque nano-oscillators by delayed self-injection
Topic: Environment/Climate
Published: 6/15/2015
Authors: Guru Bahadur S Khalsa, Mark D Stiles, Julie Grollier
Abstract: Based on theoretical models, the dynamics of spin torque nano-oscillators can be substantially modified by re-injecting the emitted signal to the input of the oscillator after some delay. Numerical simulations for vortex magnetic tunnel junctions sho ...

3. Guidelines for Radiometric Calibration of Electro-Optical Instruments for Remote Sensing
Series: Handbook (NIST HB)
Report Number: 157
Topic: Environment/Climate
Published: 5/8/2015
Authors: Howard W Yoon, Raghu N Kacker
Abstract: This publication provides guidelines for conducting radiometric calibrations of electro-optical (EO) sensors. It is intended for use by managers, technical oversight personnel, scientists, and engineers as a reference for planning and successfull ...

4. Perfluorinated Alkyl Acids in Wildlife
Topic: Environment/Climate
Published: 4/21/2015
Authors: Jessica L Reiner, Benjamin J Place
Abstract: The first measurements of perfluorinated compounds (PFCs) in wildlife from the aqueous and terrestrial environment showed their ubiquitous presence. Since the initial studies in 2001 their presence, distribution, and fate in the environment has ...

5. 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 ...

6. 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 ...

7. 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 ...

8. 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. ...

9. 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 ...

10. 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 ...

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