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 30801 - 30825 of 73829

Structural and Electronic Properties of Bilayer Epitaxial Graphene

July 1, 2008
Author(s)
Gregory M. Rutter, Jason Crain, N Guisinger, Phillip N. First, Joseph A. Stroscio
Scanning tunneling microscopy (STM) and spectroscopy (STS) is used to study the structural and electronic properties of bilayer epitaxial graphene on SiC(0001). Topographic images reveal that graphene conforms to the SiC interface roughness and is observed

Sustaining Engineering Informatics: Toward Methods and Metrics for Digital Curation

July 1, 2008
Author(s)
Joshua Lubell, Sudarsan Rachuri, Eswaran Subrahmanian, Mahesh Mani
Ensuring the long-term usability of engineering informatics (EI) artifacts is a challenge, particularly for products with longer life cycles than the computing hardware and software used for their design and manufacture. Addressing this challenge requires

The Atomic-Scale Investigation of Graphene Formation on 6H-SiC(0001)

July 1, 2008
Author(s)
N Guisinger, Gregory M. Rutter, Jason Crain, Christian Heiliger, P First, Joseph A. Stroscio
The growth of graphene on the silicon terminated face of 6H-SiC(0001) was investigated by scanning tunneling microscopy (STM) measurements. The initial stages of ultra high vacuum (UHV) graphitization resulted in the growth of individual graphene sheets on

The Escherichia coli YdcF binds S-adenosyl-L-methionine and adopts an alpha/beta fold characteristic of nucleotide-utilizing enzymes

July 1, 2008
Author(s)
Kinlin L. Chao, Kap Lim, C Lehmann, V Doseeva, A J. Howard, Frederick P. Schwarz, Osnat Herzberg
The crystal structure of YdcF at a resolution of 0.18 nm reveals a fold of the adenine nucleotide α hydrolase-like family. Following the structural clues, a nucleotide binding screen was carried out employing isothermal titration calorimetry. The following

A Framework for Measuring the Vulnerability of Hosts

June 30, 2008
Author(s)
Karen A. Scarfone, Timothy Grance
This paper proposes a framework for measuring the vulnerability of individual hosts based on current and historical operational data for vulnerabilities and attacks. Previous approaches have not been scalable because they relied on complex manually

Applying Automated Metrics to Speech Translation Dialogs

June 30, 2008
Author(s)
Sherri Condon, Jon Phillips, Christy Doran, John Aberdeen, Dan Parvaz, Beatrice Oshika, Gregory A. Sanders, Craig I. Schlenoff
Over the past five years, the Defense Advanced Research Projects Agency (DARPA) has funded development of speech translation systems for tactical applications. A key component of the research program has been extensive system evaluation, with dual

Chapter 2Combustion Products and Their Effects on Life Safety

June 30, 2008
Author(s)
Richard G. Gann, Nelson P. Bryner
All combustibles produce heat and smoke that, in sufficiently high concentration, may be hazardous to life safety. Incapacitation can result from exposure to the asphyxiant gases, irritant gases, and heat. Irritant gases and visible smoke can reduce a

Systematic-Error Signals in the AC Josephson Voltage Standard: Measurement and Reduction

June 30, 2008
Author(s)
Regis Landim, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We investigate the dominant frequency-dependent systematic error signals (SES) in the ac Josephson voltage standard. We describe our error measurement technique and a number of methods to reduce the errors. Most importantly we found that a small change in

R-22 Replacement Status (in Russian)

June 25, 2008
Author(s)
J M. Calm, Piotr A. Domanski
Since its initial recognition in 1928 and commercialization in 1936, R-22 has been applied in systems ranging from the smallest window air conditioners to the largest chillers and heat pumps, including those for district cooling and heating. Individual

Boiling with Refrigerants and Nanolubricants

June 24, 2008
Author(s)
Mark A. Kedzierski
Is it possible to improve refrigerant/lubricant boiling with nanoparticles? If so, what size of particles should be used? What s the particle material and in what concentration should they be applied to obtain the best improvement in performance? These are

Steady-state and time-resolved photoluminescence from relaxed and strained GaN nanowires grown by catalyst-free molecular-beam epitaxy

June 24, 2008
Author(s)
John B. Schlager, Kristine A. Bertness, Paul T. Blanchard, Lawrence H. Robins, Alexana Roshko, Norman A. Sanford
We report steady-state and time-resolved photoluminescence (TRPL) measurements on individual GaN nanowires (6-20 micrometers in length, 30-940 nm in diameter) grown by nitrogen-plasma-assisted, catalyst-free MBE on Si(111) and dispersed onto fused quartz

A Real World Pilot implementation of the Core Manufacturing Simulation Information Model

June 23, 2008
Author(s)
Swee K. Leong, Marcus Johansson, Bj?rn Johansson, Yung-Tsun T. Lee, Frank H. Riddick
While software for discrete event simulation (DES) has emerged into sophisticated tools for decision support in a wide range of contexts, the need to integrate DES tools with other applications is increasing. In the industrial engineering context

Model Based Uncertainty Analysis in Inter-Laboratory Studies

June 23, 2008
Author(s)
Blaza Toman, Antonio M. Possolo
Statistical analysis of key comparison and inter-laboratory experiments is required to produce an estimate of the measurand called a reference value and further, measures of equivalence of the participating laboratories. Methods of estimation of the

Smoke Control and Occupant Evacuation at the World Trade Center

June 21, 2008
Author(s)
M J. Ferreira, S M. Strege, Richard Peacock, Jason D. Averill
This paper examines smoke control and occupant evacuation in WTC 1 and WTC 2 on September 11, 2001focusing on the impact region and above for each tower. Approximately 2,000 individuals were at or above the area of impact in WTC 1 and WTC 2 who did not

High-efficiency, ultra-low-noise all-fiber photon pair source

June 20, 2008
Author(s)
Shellee D. Dyer, Martin J. Stevens, Burm Baek, Sae Woo Nam
We demonstrate an all-fiber photon pair source with the highest coincidence-to-accidental ratio (CAR) reported to date in the fiber optic telecom C-band. We achieve this through careful optimization of pair production efficiency as well as careful

Reflective attenuator for high energy laser measurements

June 20, 2008
Author(s)
John H. Lehman, David J. Livigni, Xiaoyu X. Li, Christopher L. Cromer, Marla L. Dowell
A high-energy laser attenuator in the range of 250 mJ (20 nsec pulse width, 10 Hz repetition rate, 1064 nm wavelength) is described. The optical elements which constitute the attenuator are mirrors with relatively low reflectance, oriented at 45° angle of

Entangled states of trapped atomic ions

June 19, 2008
Author(s)
Rainer Blatt, David J. Wineland
This article reviews recent experiments on entanglement and quantum information processing that use trapped ions.  It is intended to give a brief summary of the status of the field and indicate future directions and challenges.

Micro-engineered local field control for high-sensitivity multi-spectral MRI

June 19, 2008
Author(s)
Gary Zabow, Stephen Dodd, John M. Moreland, Alan P. Koretsky
In recent years, biotechnology and biomedical research have benefited from the introduction of a variety of specialized nanoparticles whose well-defined, optically distinguishable signatures enable simultaneous tracking of numerous biological indicators
Displaying 30801 - 30825 of 73829
Was this page helpful?