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Displaying 21076 - 21100 of 74053

Correlating Photovoltaic Clear-Sky and Actual Output to Sky Cover Measurements

September 1, 2013
Author(s)
David R. Daily, David Holmberg, John Baras
As distributed energy resources are added to existing building systems, and variable priced electricity tariffs are introduced, facility owners may profit from understanding the expected performance of their building systems. Hourly, forecast energy

CTOA Testing of Pipeline Steels Using MDCB Specimens

September 1, 2013
Author(s)
Robert L. Amaro, Jeffrey W. Sowards, Elizabeth S. Drexler, Joseph D. McColskey, Christopher N. McCowan
Crack tip opening angle (CTOA) is used to rank the relative resistance to crack extension of various pipeline steels. In general, the smaller the CTOA value, the lower the resistance to crack extension. It is unclear, however, whether CTOA is a material

Detection of l-C3H+ in Sgr B2(N) and Sgr B2(OH) and Refinement of its Spectroscopic Constants via the Publicly Available PRIMOS Survey and the Barry E. Turner Legacy Survey

September 1, 2013
Author(s)
Francis J. Lovas, Brett A. McGuire, P. B. Carroll, Ryan A. Loomis, Geoffery A. Blake, Jan M. Hollis, Phillip R. Jewell, Anthony J. Remijan
Pety et al. (2012) recently reported the detection and assignment of l-C3H+ in the Horsehead nebula. Here, we expand that analysis to include the J = 1 - 0 and J = 2 - 1 transitions of l-C3H+ observed in absorption towards Sgr B2(N) in data from the

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
Displaying 21076 - 21100 of 74053
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