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Displaying 23676 - 23700 of 73994

Regional, Temporal, and Species Patterns of Mercury in Alaskan Seabird Eggs: Mercury Sources and Cycling or Food Web Effects?

March 4, 2012
Author(s)
Russell D. Day, David G. Roseneau, Stacy S. Schuur, Keith A. Hobson, O.F.X Donard, Rebecca S. Pugh, Amanda J. Moors, Paul R. Becker
Mercury concentration ([Hg]), δ15N, and δ13C were measured in eggs from common murres (Uria aalge), thick-billed murres (U. lomvia), glaucous gulls (Larus hyperboreus), and glaucous-winged gulls (L. glaucescens) collected throughout Alaska from 1999 to

EFFECT OF AL2O3 NANOLUBRICANT ON A TURBO-BII R134A POOL BOILING SURFACE

March 3, 2012
Author(s)
Mark A. Kedzierski
This paper quantifies the influence of Al2O3 nanoparticles on the pool boiling performance of R134a/polyolester mixtures on a Turbo-BII-HP boiling surface. An Al2O3 nanolubricant (a lubricant containing dispersed nano-size particles) was made by suspending

Extension of the NIST spectral power-responsivity calibration service to 2500 nm

March 2, 2012
Author(s)
George P. Eppeldauer, Howard W. Yoon, Jinan Zeng, Thomas C. Larason, Jeanne M. Houston, Vladimir Khromchenko
The National Institute of Standards and Technology (NIST) is working to extend the upper wavelength limit of the spectral power-responsivity calibration service from 1800 nm to 2500 nm. This extension is based on extended-InGaAs (EIGA) transfer- and

Interactions of 14C-labeled multi-walled carbo nanotubes with soil minerals in water

March 2, 2012
Author(s)
Liwen Zhang, Elijah Petersen, Wen Zhang, Yongsheng Chen, Miguel Cabrera, Qingguo Huang
One of the critical factors related to the environmental fate of carbon nanotubes (CNTs) is their phase distribution between soil or sediment and water. To quantitatively understand the interaction between the model soil components and multiwalled carbon

Optical fibre-coupled cryogenic radiometer with carbon nanotube absorber

March 2, 2012
Author(s)
David J. Livigni, Nathan A. Tomlin, Christopher L. Cromer, John H. Lehman
A cryogenic radiometer was constructed for direct-substitution optical-fibre power measurements. The cavity is intended to operate at the 3 K temperature stage of a dilution refrigerator or 4.2 K stage of a liquid cryostat. The optical fibre is removable

Transitory Temperatures of Organic-Film Coated Specimens under Outdoor Exposure

March 2, 2012
Author(s)
William C. Thomas, Christopher C. White, Walter E. Byrd
A mathematical model is presented and validated for predicting the temperature of thin polymeric films bonded to substrate materials. The National Institute of Standards and Technology provided specimen temperature and simultaneous weather data for tests

An absolute cavity pyrgeometer to measure the absolute outdoor longwave irradiance with traceability to International System of Units, SI

March 1, 2012
Author(s)
Ibrahim Reda, Jinan Zeng, Jonathan Scheuch, Leonard Hanssen, Daryl Myers, Boris Wilthan, Tom Stoffel
This article describes a method of measuring the absolute outdoor longwave irradiance using an absolute cavity pyrgeometer (ACP). The ACP consists ofa domeless thermopile pyrgeometer, gold- plated concentrator, temperature controller, and data acquisition

An Assessment of Methods for Determining Wind Loads (NIST TN 1738)

March 1, 2012
Author(s)
Emil Simiu, Chris Letchford, Nicholas Isyumov, Arindam G. Chowdhury, Dong Hun Yeo
The purpose of this work is to present an assessment of methods for determining wind loads on buildings and other structures that warrant comment, correction or improvement. The assessment is intended to serve as a resource as a new version of the ASCE-7

Catalyst-free GaN Nanowires as Nanoscale Light Emitters

March 1, 2012
Author(s)
Kristine A. Bertness, Norman A. Sanford, John B. Schlager, Alexana Roshko, Todd E. Harvey, Paul T. Blanchard, Matthew D. Brubaker, Andrew M. Herrero, Aric W. Sanders
Catalyst-free growth of GaN nanowires with molecular beam epitaxy produces material of exceptionally high quality with long minority carrier lifetimes and low surface recombination velocity. The nanowires grow by thermodynamic driving forces that enhance

Challenges in Microbial Sampling in the Indoor Environment

March 1, 2012
Author(s)
Jayne B. Morrow, Autumn S. Downey, Jordan Peccia
This report summarizes the results of the Challenges in Microbial Sampling in the Indoor Environment Workshop held on February 14-15, 2011 at the National Institute of Standards and Technology in Gaithersburg, Maryland.

CODATA Recommended Values of the Fundamental Physical Constants: 2010

March 1, 2012
Author(s)
Peter J. Mohr, Barry N. Taylor, David B. Newell
This paper give the 2010 self-consistent set of values of the basic constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology (CODATA) for international use. The 2010 adjustment takes into

Differential matrices for depolarizing media

March 1, 2012
Author(s)
Thomas A. Germer
The evolution of a Stokes vector through depolarizing media is considered. A general form for the differential matrix is derived that is appropriate in the presence of depolarization, and is parameterized in a manner that ensures that it yields, upon

Freeform Fabricated Scaffolds with Roughened Struts that Enhance both Stem Cell Proliferation and Differentiation by Controlling Cell Shape

March 1, 2012
Author(s)
Girish Kumar, Carl G. Simon Jr., Michael S. Waters, Tanya M. Farooque, Marian F. Young
We demonstrate that imparting freeform fabricated (FFF) scaffolds with surface roughness on their struts enhances osteogenic differentiation of primary human bone marrow stromal cells (hBMSCs) by controlling cell shape. Previous work showed that hBMSCs

Hydration Water Freezing in Single Supported Lipid Bilayers

March 1, 2012
Author(s)
Laura Toppozini, Clare L. Armstrong, Martin D. Kaye, Madhu Sudan Tyagi, Timothy Jenkins, Maikel C. Rheinstadter
We present a high temperature and high energy resolution neturon scattering investigation of hydration water freezing in single supported lipid bilayers. Single supported lipid bilayers provide a well defined biological interface to study hydroation water

Light a Single Candle: Studying Supernovae

March 1, 2012
Author(s)
Dianne M. O'Leary, Bert W. Rust
At peak luminosity, Type Ia supernovae can be even brighter than their parent galaxies, and their light curves display a very uniform and regular behavior. This makes them excellent candidates for a role as standard candles in measuring the distances to
Displaying 23676 - 23700 of 73994
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