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Displaying 29101 - 29125 of 143780

Triennial report 2011-2015 Division XII, Commission 14, Working Group 1 on Atomic Data

April 13, 2016

Author(s)

Gillian Nave

This report summarizes laboratory measurements of atomic wavelengths, energy levels, hyperfine and isotope structure, energy level lifetimes, and oscillator strengths. Theoretical calculations of lifetimes and oscillator strengths are also included. The

Influence of Nanoparticle Processing and Additives on PES Casting Solution Viscosity and Cast Membrane Characteristics

April 12, 2016

Author(s)

Lauren F. Greenlee, Nikki S. Rentz

Nanoparticle stabilizer type, casting solution additives, and nanoparticle processing by centrifugal or magnetic separation were varied, and specific membrane characteristics were evaluated. Specifically, membrane casting solution viscosity, cast membrane

Catalyzing the Internet of Things and Smart Cities: Global City Teams Challenge.

April 11, 2016

Author(s)

Sokwoo Rhee

Many smart city and Internet of Things (IoT) solutions are suffering from fragmentation and lack of economies of scale. To address this issue, the National Institute of Standards and Technology (NIST) initiated the Global City Teams Challenge (GCTC) to

Characterization of a self-calibrating, high-precision, stacked-stage, vertical dual-axis goniometer

April 11, 2016

Author(s)

Marcus H. Mendenhall, Albert Henins, Donald A. Windover, James P. Cline

We present details on the alignment and calibration of a goniometer assembly consisting two stacked, optically encoded, vertical axis rotation stages. A technique for its calibration is presented that utilizes a stable, uncalibrated, third stage to

Kinetics of Photodegradation and Nanoparticle Surface Accumulation of a Nanosilica/Epoxy Coating Exposed to UV Light

April 11, 2016

Author(s)

Li Piin Sung, Justin Gorham, Deborah Jacobs, Savelas A. Rabb, Lee L. Yu, Tinh Nguyen

Temperature effect on the kinetics of photodegradation, surface accumulation of nanoparticles, and nanoparticle release in an epoxy nanocoating exposed to ultraviolet light (UV) was investigated. A model epoxy coating containing 5 % untreated nanosilica

Phase Analysis of Portland Cements by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy

April 11, 2016

Author(s)

Paul E. Stutzman, Pan Feng, Jeffrey W. Bullard

X-ray powder diffraction (XRD) has been used for several decades to identify and measure the mass fractions of various crystalline phases in portland cement. More recently, a combination of scanning electron microscopy with X-ray microanalysis (SEM/XMA)

Phase equilibria and microstructural evolution in ternary Co-Al-W between 750 degC and 1100 degC

April 11, 2016

Author(s)

Eric Lass, Richard D. Grist, Maureen E. Williams

Phase equilibria between 750 °C and 1100 °C in the Co-rich portion of the Co-Al-W ternary system are investigated via isothermal annealing of five ternary alloy compositions. At temperatures of 900 °C and below, the phase diagram is dominated by a three

Comparison of Consensus Value Methods Used to Compile On-Axis Gain Measurement Results

April 9, 2016

Author(s)

Jeffrey R. Guerrieri

This paper compares methods for computing consensus values of data sets. Three methods are used to analyze multiple data sets. The data sets are, on-axis gain measurements that have a large range of values and uncertainties. The appropriate method is

Multi-purpose Configurable Range for Antenna Testing Up To 220 GHz*

April 9, 2016

Author(s)

David R. Novotny, Michael H. Francis, Ronald C. Wittmann, Josh Gordon, Jeffrey R. Guerrieri, Alexandra Curtin

NIST has developed a multi-purpose test range for performing several types of antenna testing including spherical, cylindrical and planar near-field scanning as well as extrapolation measurements. This range uses a commercial, offthe- shelf, six-axis robot

Chironomus riparius exposure to fullerene-contaminated sediment results in oxidative stress and may impact life cycle parameters

April 8, 2016

Author(s)

Greta Waissi-Leinonen, S Bold, J Akkanen, Matti Leppanen, Elijah Petersen, JVK Kukkonen

A key component of understanding the potential environmental risks of fullerenes (nC60) is their potential effects on benthic invertebrates. Using the sediment dwelling invertebrate Chironomus riparius we explored the effects of acute (12 h and 24 h) and

Heat Release Rates of Electrical Enclosure Fires (HELEN-FIRE)

April 8, 2016

Author(s)

Kevin B. McGrattan, Scott D. Bareham

This report documents an experimental program to quantify the heat release rate and burning behavior of electrical enclosures commonly found in nuclear power plants. Electrical enclosures are a potential source of fire in nuclear power plants because they

Size-exclusion chromatography of metal nanoparticles and quantum dots

April 8, 2016

Author(s)

Leena M. Pitkanen, Andre Striegel

This review presents an overview of size-exclusion chromatographic separation and characterization of noble metal nanoparticles (NPs) and quantum dots (QDs) over the past 25 years. The properties of NPs and QDs that originate from quantum and surface

A New Regime of Pauli-Spin Blockade

April 7, 2016

Author(s)

Justin K. Perron, Michael D. Stewart, Neil M. Zimmerman

Pauli-spin blockade is a phenomenon that allows for a type of spin to charge conversion often used to probe fundamental physics such as spin relaxation and singlet-triplet coupling. In this paper we theoretically explore Pauli-spin blockade as a function

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