U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications

NIST Authors in Bold

Displaying 18526 - 18550 of 74178

Content-Based Video Copy Detection Benchmarking at TRECVID

June 1, 2014
Author(s)
George M. Awad, Paul D. Over, Wessel Kraaij
This paper presents an overview of the video copy detection benchmark which was run over a period of 4 years (2008-2011) as part of the TREC Video Retrieval (TRECVID) workshop series. The main contributions of the paper include i) an examination of the

Evolution of electrochemical interfaces in solid oxide fuel cells (SOFC): a Ni and Zr resonant anomalous ultra-small-angle X-ray scattering studywith elemental and spatial resolution across the cell assembly

June 1, 2014
Author(s)
Andrew J. Allen, Jan Ilavsky, Pete R. Jemian, Artur Braun
Electrochemical interfaces are key to the direct conversion of fuels to electrical energy and lend energy converters like solid oxide fuel cells (SOFC) their functionality. Over extended operation at high temperatures, the microstructure of the underlying

Experimental Study of Firebrand Transport

June 1, 2014
Author(s)
Samuel L. Manzello, Kuibin Zhou, Sayaka Suzuki
The NIST Firebrand Generator (NIST Dragon) has been used to quantify the vulnerability of structures to ignition by firebrand attack. The Firebrand Generator is also as useful device to study firebrand transport, and has been used to validate firebrand

Exposing Decking Assemblies to Continuous Wind-Driven Firebrand Showers

June 1, 2014
Author(s)
Samuel L. Manzello, Sayaka Suzuki
A series of experiments were conducted to examine potential vulnerabilities of wood decks to continuous, wind-driven firebrand showers. Sections of wood decks (1.2 m by 1.2 m) were constructed and attached to a re-entrant corner assembly. The deck

Gain and Loss in active waveguides based on lithographically defined quantum dots

June 1, 2014
Author(s)
Kevin L. Silverman, Luis Miaja Avila, Varun B. Verma, Richard P. Mirin, James J. Coleman
We report on the optical gain and loss of waveguides containing lithographically defined quantum dots. Lasing action has previously been demonstrated in a nominally identical structure. Measurements are made by monitoring the transmission of a resonant

Low carrier density epitaxial graphene devices on SiC

June 1, 2014
Author(s)
Yanfei Yang, Lung-I Huang, Yasuhiro Fukuyama, Fan-Hung Liu, Mariano Real, Paola Barbara, Chi-Te Liang, David B. Newell, Randolph Elmquist
Monolayer epitaxial graphene grown on a hexagonal silicon carbide (SiC) substrate is typically found to be heavily n-doped (10e13 cm-2) and in most devices made with the as-grown epitaxial graphene the quantized Hall resistance plateau with Landau level

Does Your SEM Really Tell the Truth? How Would You Know? Part 2

May 30, 2014
Author(s)
Michael T. Postek, Andras Vladar, Premsagar P. Kavuri
The scanning electron microscope (SEM)has gone through a tremendous evolution to become indispensable for many and diverse scientific and industrial applications. The improvements have significantly enriched and augmented the overall SEM performance and

Influence of Flame Characteristics on Gas- Phase Fire Retardant Effectiveness

May 30, 2014
Author(s)
Gregory T. Linteris, Nicolas Bouvet, Valeri I. Babushok, Fumiaki Takahashi, Viswanath R. Katta, Stanislav Stoliarov, Peter B. Sunderland
The presentation discusses the influence of flame characteristics on gas-phase fire retardant effectiveness. First, the action of super-effective agents in co-flow diffusion flames is reviewed, highlighting how particle formation had a detrimental effect

Large-area irradiance-mode spectral response measurements of solar cells by a light-emitting-diode- based integrating sphere source

May 30, 2014
Author(s)
Behrang H. Hamadani, John F. Roller, Andrew M. Shore, Brian P. Dougherty, Howard W. Yoon
An irradiance-mode absolute differential spectral response measurement system based on a light emitting diode (LED) array is described. The LEDs are coupled to an integrating sphere whose output irradiance is uniform to better than 2 % over an area of 160

Magnetic Ordering induced by Interladder Coupling in the Spin-1/2 Heisenberg Two-leg Ladder Antiferromagnet C 9 H 18 N 2 CuBr 4

May 30, 2014
Author(s)
Tao Hong, K. P. Schmidt, K. Coester, F.F. Awwadi, M.M. Turnbull, Yiming Qiu, Jose Rodriguez Rivera, M. Zhu, X. Ke, C.P. Aoyama, Y. Takano, Huibo Cao, W. Tian, J. Ma, R. Custelcean, H.D. Zhou, M. Matsuda
We present specific-heat and neutron-scattering results for the S=1/2 quantum antiferromagnet (dimethylammonium)(3,5-dimethylpyridinim)CuBr 4. The material orders magnetically at Τ N=1.99(2)K, and magnetic excitations are accompanied by an energy gap of 0

Phase Transitions in K-doped MoO 2

May 30, 2014
Author(s)
L.M.S. Alves, B.S. de Lima, C.A.M. dos Santos, A. Rabello, S.H. Masunaga, J. J. Neumeier, Juscelino Leao
K 0.05MoO 2 has been studied by x-ray and Neutron diffractometry, electrical resistivity, magnetization, heat cpacity, and thermal expansion measurements. The compound displays two phase transitions, a first order phase transition near room temperature and

Report of the 97th National Conference on Weights and Measures (2012)

May 30, 2014
Author(s)
Linda D. Crown, Tina G. Butcher, Richard A. Harshman, David A. Sefcik, Lisa Warfield
The 97th Annual Meeting of the National Conference on Weights and Measures (NCWM) was held July 15 through 19, 2012, at the Holiday Inn by the Bay, Portland, Maine. The theme of the meeting was "Taking Measure of Our Worth." Reports by the NCWM Board of

Alkali Metal Hydride Modification on Hydrazine Boranes for Improved Dehydrogenation

May 29, 2014
Author(s)
Yong Shen Chua, Qijun Pei, Xiaohua Ju, Wei Zhou, Terrence J. Udovic, Guotao Wu, Zhitao Xiong, Ping Chen, Hui Wu
Hydrazinoboranes of various alkali metals, i.e., NaN 2H 3BH 3 and KN 2H 3BH 3, were synthesized via a liquid approach. The crystal structures of NaN 2H 3BH 3 were determined and their dehydrogenation properties were compared with LiN 2H 3BH 3 and N 2H 4BH
Displaying 18526 - 18550 of 74178