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 2651 - 2675 of 2934

Surface conduction of topological Dirac electrons in bulk insulating Bi2Se3

April 15, 2012
Author(s)
Dohun Kim, Sungjae Cho, Nicholas P. Butch, Paul Syers, Kevin Kirshenbaum, Shaffique Adam, Johnpierre Paglione, Michael S. Fuhrer
The newly-discovered three-dimensional strong topological insulators (STIs) exhibit topologically-protected Dirac surface states. While the STI surface state has been studied spectroscopically by e.g. photoemission and scanned probes, transport experiments

Self-Repairing Complex Helical Columns Generated via Kinetically Controlled Self-Assembly of Dendronized Perylene Bisimides

November 16, 2011
Author(s)
Virgil Percec, Steven Hudson, Mihai Peterca, Pawaret Leowanawat, Emad Aqad, Robert Graf, Hans -. Spiess, Xiangbing Zeng, Goran Ungar, Paul A. Heiney
The dendronized perylene 3,4:9,10-tetracarboxylic acid bisimide (PBI) (3,4,5)12G1-3-PBI was recently shown to self-assemble in a complex helical column containing tetramers of PBI as the basic repeat unit. The tetramers contain a pair of two molecules

IMPACT OF CLASSICAL ASSUMPTIONS IN MODELLING A MICROCHANNEL GAS COOLER

July 5, 2011
Author(s)
Santiago Martinez-Ballester, Jose M. Corberan, Jose Gonzalvez-Macia, Piotr A. Domanski
Most of the current air-to-refrigerant heat exchanger models use the classic ε-NTU approach. These models do not account for 2D longitudinal heat conduction in the tube and the longitudinal heat conduction in the fin. These models, also do not account for

AN ADHESION TEST METHOD FOR SPRAY-APPLIED FIRE-RESISTIVE MATERIALS

June 21, 2010
Author(s)
Kar T. Tan, Christopher C. White, Donald L. Hunston
Adhesion of spray-applied fire-resistive materials (SFRMs) to steel structures is critical in enabling the capacity of a building to remain functional for a specific length of time during a fire for life safety and fire department assess. Empirical tests

Effect of Air Infiltration and Ventilation

November 17, 2009
Author(s)
Andrew K. Persily, Steven J. Emmerich
… in Chapter 27 Ventilation and Infiltration of the ASHRAE Fundamentals Handbook (ASHRAE 2005), and therefore the …

Optical Properties of Semiconductors

October 19, 2009
Author(s)
David G. Seiler, Stefan Zollner, Alain C. Diebold, Paul Amirtharaj
Rapid advances in semiconductor manufacturing and associated technologies have increased the need for optical characterization techniques for materials analysis and in-situ monitoring/control applications. Optical measurements have many unique and

Hashing Techniques for Mobile Device Forensics

June 15, 2009
Author(s)
Richard Ayers, Shira Danker, Rick Mislan
Technological advances found in mobile devices today, equal or exceed that of the computing power present in desktop computers of less than a decade ago. As mobile devices proliferate, techno-logical advances provide users with increased power, range

International NMR-based Environmental Metabolomics Intercomparison Exercise

April 7, 2009
Author(s)
Daniel W. Bearden, Mark Viant, Jacob Bundy, Ian Burton, Tim Collette, Drew Ekman, Tobias Karakach, Ching Y. Lin, Simone Rochfort, Jeff de Ropp, Quincy Teng, Ron Tjeerdema, John Walter, Huifeng Wu
Several fundamental requirements must be met so that NMR-based metabolomics can be formally adopted into environmental monitoring and chemical risk assessment. Here we report an intercomparison exercise which has evaluated the accuracy, precision and

NUMERICAL SIMULATION OF FIRE SPREAD ON POLYURETHANE FOAM SLABS

March 17, 2009
Author(s)
Kuldeep R. Prasad, Roland Kramer, Nathan D. Marsh, Marc R. Nyden, Thomas J. Ohlemiller, William M. Pitts, Mauro Zammarano
The NIST Fire Dynamics Simulator (FDS) is used extensively by the fire protection engineer for performance based design and forensic analysis. The equations of motion describing the gas phase are relatively well known and the approximations in the various

The First High-Resolution Analysis of the 10 [mu]m Absorption of Thioformaldehyde

October 8, 2007
Author(s)
J.- M. Flaud, Walter J. Lafferty, A. Perrin, Y S. Kim, Helmut Beckers
The 10 m region of thioformaldehyde (H2CS) has been recorded at high resolution (0.005 cm-1) using a Fourier transform spectrometer. H2CS was produced by low pressure pyrolysis of a gas flow of C3H5SCH3 in Ar at 560oC or CH3SCl at 1150o C which was

Field-free ringing of nanomagnets

July 1, 2007
Author(s)
Thomas J. Silva
Ever since William Gilbert's 16th century treatise "De Magnete," it has been known that magnetic fields can be used to manipulate the magnetic orientation of ferromagnets. This has been the foundation for electronic applications of magnetic materials for

Development of an Experimental Database and Kinetic Models for Surrogate Diesel Fuels

April 16, 2007
Author(s)
J T. Ferrell, N Cernansky, F L. Dryer, Daniel G. Friend, C A. Hergart, C K. Law, R M. McDavid, Christian Mueller, A K. Patel, Heinz Pitsch
Computational fluid dynamic (CFD) simulations that include realistic combustion/emissions chemistry hold the promise of significantly shortening the development time for advanced, high efficiency, low emission engines. However, significant challenges must

Analysis of potential cancer biomarkers in mitochondrial DNA

December 1, 2006
Author(s)
J P. Jakupciak, G. D. Dakubo, Samantha D. Maragh, R. L. Parr
Understanding mitochondrial biology is a fundamental research goal in human genetics and medicine. The use of mitochondria to serve as a biomarker is rapidly expanding in disciplines ranging from cancer, rare metabolic diseases, aging, the tracing of human

Propagation and Detection of Radio Signals Before, During, and After the Implosion of a Large Convention Center

October 1, 2006
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Susan A. Schima, M. McKinley, Robert T. Johnk
In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situations such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the strong

Minimum-phase calibration of sampling oscilloscopes

August 1, 2006
Author(s)
Andrew Dienstfrey, Paul D. Hale, Darryl A. Keenan, Tracy S. Clement, Dylan Williams
We describe an algorithm for determining the minimum phase of a linear, time-invariant response function from its magnitude. The procedure is based on Kramers-Kronig relations in combination with auxiliary direct measurements of the desired phase response

Cross-Display-Technology Video Motion Measurement Tools

February 23, 2006
Author(s)
John W. Roberts, Edward A. Fanning, Hassan A. Sahibzada
High performance video places severe demands on playback system and display device resources. Motion playback errors such as irregular motion playback and image breakup are common, making accurate measurement of motion critically important for device

Propagation and Detection of Radio Signals Before, During, and After the Implosion of a Large Sports Stadium (Veterans Stadium in Philadelphia)

October 1, 2005
Author(s)
Christopher L. Holloway, Galen H. Koepke, Dennis G. Camell, Catherine A. Remley, Dylan F. Williams, Susan A. Schima, Seturnino Canales
In this report, we investigate radio communications problems faced by emergency responders (firefighters and police) in disaster situation such as collapsed buildings. A fundamental challenge to communications into and out of large buildings is the strong
Displaying 2651 - 2675 of 2934
Was this page helpful?