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Displaying 20801 - 20825 of 73751

Lateral torsional buckling of steel W-beams subjected to localized fires

September 1, 2013
Author(s)
Chao Zhang, John L. Gross, Therese P. McAllister
Current design approaches to assess the lateral torsional buckling capacity of steel beams in fire are based on the assumption of uniform steel temperature. This paper investigates the effect of temperature gradients on the lateral torsional buckling

Method for Assessing the Potential Effects of Nanoparticles and other Emerging Contaminants on the Catabolic Capabilities of Microbial Communities

September 1, 2013
Author(s)
Kela Weber, Elijah Petersen, Sonja Bissegger, Lars Rehmann, Iris Koch, Jun Zhang, Kenneth Reimer, Robin Slawson, Raymond Legge, Denis O'Carroll
With an increasing utilization of nanoparticles (NPs) in consumer products, the potential for release to the environment also increases. It is therefore imperative that methods to test their potential effects in ecosystems are developed. This study

POST-COLLISION VEHICLE FIRE SUPPRESSION RESEARCH NEEDS

September 1, 2013
Author(s)
Anthony P. Hamins
This article identifies research needs in automotive fire protection. The work focuses on the problem of post-collision vehicle fires. Recent fire suppression research is cited with special attention given to results cited in the literature as well as

State and Measurement Tomography of an Exchange-Only Spin Qubit

September 1, 2013
Author(s)
Jacob M. Taylor, Medford Jim, Johannes Beil, Stephen Bartlett, Andrew Doherty, Emmanuel Rashba, David P. DiVincenzo, H Lu, A. C. Gossard
We demonstrate the initialization, full electrical control, and state tomography of an exchange- only spin qubit in a GaAs heterostructure. Decoherence and leakage from the qubit subspace are accounted for with a model of charge noise and fluctuating

Viscosity Modifiers to Enhance Early Age Performance and Long Term Durability of Concrete

September 1, 2013
Author(s)
Dale P. Bentz, Kenneth A. Snyder, Max A. Peltz, K H. Obla, Haejin Kim
The service life distribution of concrete structures typically follows a “bathtub”-shaped function, with a finite probability of early-age failures being followed by a life with a relative low probability of failure that ultimately increases dramatically

Congestion Due to Random Walk Routing

August 31, 2013
Author(s)
Vladimir V. Marbukh, Iraj Saniee, Onuttom Narayan
In this paper we derive an analytical expression for the mean load at each node of an arbitrary undirected graph for the uniform multicommodity flow problem under random walk routing. We show the mean load is linearly dependent on the nodal degree with a

Ferromagnetism in Bi 2 Se 3 :Mn Epitaxial Layers

August 30, 2013
Author(s)
H.J. von Bardeleben, J.L. Cantin, D. M. Zhang, A. Richardella, D. W. Rench, N. Samarth, Julie Borchers
The magnetism in approximatley}1at% Mn doped nanometric Bi 2Se 3 epitaxial layers has been studied by ferromagnetic resonance (FMR), magnetometry and polarized neutron reflectivity (PNR) measurements. The FMR results reveal the formation of an intrinsic

Characterization of Airborne Nanoparticle Released from Consumer Products

August 29, 2013
Author(s)
Li Piin Sung, Joannie W. Chin, Andrew K. Persily
This interim report summarizes research results to date under the FY2012 interagency agreement between CPSC and NIST to develop testing and measurement protocols for determining the quantities and properties of nanoparticles released from flooring finishes

Electronic Authentication Guideline

August 29, 2013
Author(s)
William E. Burr, Donna F. Dodson, Elaine M. Newton, Ray A. Perlner, William T. Polk, Sarbari Gupta, Emad A. Nabbus
This recommendation provides technical guidelines for Federal agencies implementing electronic authentication and is not intended to constrain the development or use of standards outside of this purpose. The recommendation covers remote authentication of

Application of physical and chemical characterization techniques to metallic powders

August 28, 2013
Author(s)
Edward J. Garboczi, John A. Slotwinski, Max A. Peltz, Chiara F. Ferraris, Stephanie S. Watson, Paul E. Stutzman
Systematic studies have been done on two different powder materials used for additive manufacturing: stainless steel and cobalt-chrome. The characterization of these powders is important in NIST efforts to develop appropriate measurements and standards for

Physical and chemical characterization techniques for metallic powders

August 28, 2013
Author(s)
John A. Slotwinski, Paul E. Stutzman, Stephanie S. Watson, Edward J. Garboczi, Max A. Peltz, Chiara F. Ferraris
Systematic studies have been done on two different powder materials used for additive manufacturing: stainless steel and cobalt-chrome. An extensive array of characterization techniques were applied to these two powders. The physical techniques included

Wide Ranging Viscosity Measurements of Rocket Propellant RP-2

August 28, 2013
Author(s)
Arno D. Laesecke, Dylan S. Cousins
Expanding on earlier viscosity measurements of rocket propellants from 293 K to 373 K at atmospheric pressure, the viscosity of rocket propellant RP-2 was measured from 270 K to 450 K with pressures to 137 MPa. The instrument was an oscillating piston

Direct Comparison of two NIST PJVS systems at 10 V

August 27, 2013
Author(s)
Stephane Solve, Alain Rufenacht, Charles J. Burroughs, Samuel Benz
Two NIST Programmable Josephson Voltage Standard (PJVS) systems have been directly compared at 10V using different nanovoltmeters at the temperature of the laboratory. These PJVS systems use arrays double-stacked superconducting-niobium Josephson junctions
Displaying 20801 - 20825 of 73751
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