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You searched on: Topic Area: Environment/Climate

Displaying records 11 to 20 of 245 records.
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11. 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 ...

12. Research highlights: Elucidating the role of complex interactions affecting nanoparticle deposition
Topic: Environment/Climate
Published: 6/1/2015
Authors: Stacey M Louie, John M Pettibone
Abstract: In this issue, we highlight recent works that advance our understanding of physicochemical mechanisms governing nanoparticle (NP) deposition in the environment. In one study, the transport of citrate-stabilized silver NPs in an unsaturated porou ...

13. On-wafer Magnetic Resonance of Magnetite Nanoparticles
Topic: Environment/Climate
Published: 5/11/2015
Authors: Charles Anderson Enright Little, Stephen E Russek, James C Booth, Pavel Kabos, Robert J. Usselman
Abstract: Magnetic resonance measurements of ferumoxytol and TEMPO were made using an on-wafer transmission line technique with a vector network analyzer, allowing for broadband measurements of small sample volumes (4 nl) and a small numbers of spin (1 nmole). ...

14. 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 ...

15. 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 ...

16. 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 ...

17. 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 ...

18. 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 ...

19. 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 ...

20. 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 J 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. ...

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