Skip to main content

NOTICE: Due to a lapse in annual appropriations, most of this website is not being updated. Learn more.

Form submissions will still be accepted but will not receive responses at this time. Sections of this site for programs using non-appropriated funds (such as NVLAP) or those that are excepted from the shutdown (such as CHIPS and NVD) will continue to be updated.

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 31676 - 31700 of 73697

Mesoporous Silica Films with Long-Range Order Prepared from Strongly Segregated Block Copolymer/Homopolymer Blend Templates

October 24, 2007
Author(s)
Vijay Tirumala, R A. Pai, Sumit Agarwal, Curran Chandler, Gaurav Bhatnagar, Alvin Omang, Eric K. Lin, J J. Watkins
Well ordered mesoporous silica films were prepared by infusion and selective condensation of Si alkoxides within pre-organized block copolymer/homopolymer blend templates using supercritical CO2 as the delivery medium. The morphologies of mesoporous silica

Electron Impact Ionization of Metastable Rare Gases: He, Ne and Ar

October 23, 2007
Author(s)
M A. Ali, Philip M. Stone
Ionization cross sections by electron impact of atoms are important quantities needed for modeling of low temperature plasmas and gas discharges. Although experimental and theoretical studies of ionization of ground states of atoms have been extensive

Fatigue Crack Growth Rates in Pipeline Steels Using Curved M(T) Specimens

October 23, 2007
Author(s)
Philippe P. Darcis, John M. Treinen, Joseph D. McColskey
This study presents fatigue data for two different ferrite-pearlite pipeline steels. A fatigue crack growth test for full thickness curved pipeline samples was developed using a Middle Tension, M(T), type specimen. Also, FEA (Finite Element Analyses) were

The Molecular Origin of Enhanced Toughness in Double-Network Hydrogels

October 22, 2007
Author(s)
Taiki Tominaga, Vijay Tirumala, Eric K. Lin, Jian P. Gong, Hidemitsu Furukawa, Yoshihito Osada, Wen-Li Wu
The long-standing pursuit of a synthetic equivalent to tissue cartilage has seen significant new activity with the development of a new materials strategy: double-network hydrogels (DN-gels) prepared from a combination of an anionic polyelectrolyte and a

Dynamics of Confined Polymer Films Measured via Thermal Wrinkling

October 19, 2007
Author(s)
Kirt A. Page, Derek L. Patton, Rui Huang, Christopher Stafford
In the past several years there have been a number of advances in the understanding of the physics of polymer thin films. However, there still remains a wide range of opportunities to further this understanding through the development of measurement tools

An Automated Densimeter for the Rapid Characterization of Industrial Fluids

October 18, 2007
Author(s)
Stephanie L. Outcalt, Mark O. McLinden
An apparatus for the automated measurement of compressed liquid densities over the temperature range of 270 K to 470 K and pressures to 50 MPa is described. The heart of the apparatus is a commercial vibrating tube densimeter. In order to minimize the

Confinement, Entropy, and Single-Particle Dynamics of Equilibrium Hard-Sphere Mixtures

October 18, 2007
Author(s)
Jeetain Mittal, Vincent K. Shen, Jeffrey R. Errington, Thomas M. Truskett
We use discontinuous molecular dynamics and grand-canonical transition-matrix Monte Carlo simulations to explore how confinement between parallel hard walls modifies the relationships between packing fraction, self-diffusivity, partial molar excess entropy

Development of the Aerosol Particle Mass Analyzer

October 17, 2007
Author(s)
Nobuhiko Fukushima, Naoko Tajima, Kensei Ehara, Hiromu Sakurai, Kevin Coakley
The Aerosol Particle Mass Analyzer (APM), can classify particles according to their mass-to-charge ratio. The utility of the APM has been confirmed; the APM has been applied to atmospheric aerosol research and engine exhaust measurements. The operating

The State of Container Security Standards

October 17, 2007
Author(s)
Shaw C. Feng, Simon P. Frechette
As cargo container security is a critical component in the U.S. homeland security, the communication among people in a chain of custody of a container needs to be timely and effective. Since people in the container custody chain often use different

Crack Tip Opening Angle Optical Measurement Methods in Five Pipeline Steels

October 16, 2007
Author(s)
Philippe P. Darcis, Christopher N. McCowan, H. Windhoff, Joseph D. McColskey, Thomas A. Siewert
Crack tip opening angle (CTOA) is becoming one of the more widely accepted properties for characterizing fully plastic fracture. In fact, it has been recognized as a measure of the resistance of a material to fracture in cases where there is a large degree

Coherent transfer of an optical carrier over 251 km

October 15, 2007
Author(s)
Nathan R. Newbury, Paul A. Williams, William C. Swann
We transfer of an optical frequency over 251 km of optical fiber with a residual instability of 6×10 -19 at 100 s. This instability and the associated timing jitter are limited fundamentally by the noise on the optical fiber and link length. We give a

Fast and High Efficient Microfluidic PCR By Microwave Dielectric Heating

October 15, 2007
Author(s)
Pierre-Alain Auroux, Darwin R. Reyes-Hernandez, Jayna J. Shah, Michael Gaitan
We report 100% yield and 40% reaction-time reduction for on-chip DNA amplification using microwave dielectric heating. A passivation protocol has also been developed to suppress the inhibition of PCR in PMMA chips used with a temperature sensor. We finally

Narrow linewidth fiber laser frequency combs

October 15, 2007
Author(s)
William C. Swann, Ian R. Coddington, John Mcferran, Nathan R. Newbury
Fiber laser frequency combs can provide a series of optical lines that span the spectrum from 1 to 2 υm. By tightly locking the frequency comb to an optical reference, it is possible for these comb lines to exhibit residual linewidths below 1 Hz and

Spectra of W 39+ -W 47+ in the 12 nm to 20 nm Region Observed With an EBIT Light Source

October 14, 2007
Author(s)
Yuri Ralchenko, Joseph Reader, Joshua M. Pomeroy, Joseph N. Tan, John D. Gillaspy
We observed spectra of highly ionized tungsten in the extreme ultraviolet with an electron beam ion trap (EBIT) and a grazing incidence spectrometer at the National Institute of Standards and Technology. Stages of ionization were distinguished by varying
Displaying 31676 - 31700 of 73697
Was this page helpful?