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 29001 - 29025 of 74303

Dynamical Heterogeneities in the Ising Spin Glass

October 16, 2008
Author(s)
S C. Glotzer, N Jan, T Lookman, A B. MacIsaac, P H. Poole
We investigate the relationship between bulk and local relaxation in the Ising spin glass (in 2 and 3 dimensions) for temperatures above but approaching the glass transition temperature, using Monte Carlo computer simulations. We find that the stretched

Dynamical Heterogeneity in the Ising Spin Glass

October 16, 2008
Author(s)
S C. Glotzer, N Jan, T Lookman, A B. MacIsaac, P H. Poole
We investigate the relationship between bulk and local relaxation in the Ising spin glass (in 2 and 3 dimensions) for temperatures above but approaching the glass transition temperature, using Monte Carlo computer simulations. We find that the stretched

Dynamics of DNA Through a Nanopore

October 16, 2008
Author(s)
Robert Hagwood
Single stranded DNA is modeled as a flexible polymer. The motion of such DNA in a vessel partitioned by a membrane containing a cylindrical nanopore is modeled. Statistical quantities such as the probability that a polymer end is at the pore entrance at

eBook Standards

October 16, 2008
Author(s)
J Potman
A discussion of current and proposed eBook standards and their applications. The discussions include: Open eBook Publication Structure (OEBPS), Portable Document Format (PDF), Open eBook File Format (OEBFF), Electronic Book Exchange System (EBX)

Edge Toughness and Material Properties of Dental Ceramics

October 16, 2008
Author(s)
Janet Quinn, Isabel K. Lloyd
Objectives: In the edge chipping test, an increasing load is applied near the edge of a material until a chip is formed. Higher loads are required to form chips at greater distances from the specimen edge. The chip loads are plotted against the edge

Edge-Chip Testing of Glass at Different Applied Force Angles

October 16, 2008
Author(s)
Janet Quinn, R Mohan V. C.
Current edge-chip material testing procedures involve applying an increasing perpendicular force near a specimen edge until a chip forms. In this report, the effects of applied forces that are not perpendicular are studied, including quantitative changes

Effect of modified interfaces on electromigration of passivated Al lines

October 16, 2008
Author(s)
C E. Kalnas, J M. Phelps, T N. Marieh, A Ho
Al interconnect lines, 2.6 υm wide, 0.5 υm thick, and 300 υm long, were synthesized with modified metal/passivation interfaces. The interface modifications are discontinuous along the length of the line, enabling comparison of void formation in modified

Effect of Signal-Processing Parameters on Phase Velocity Uncertainty

October 16, 2008
Author(s)
M C. Renken, C M. Fortunko, C T. Mullis
Quantification of signal-processing effects is required for an accurate determination (less than 1% uncertainty) of the absolute phase velocity, particularly when Fouier techniques are used. The velocity is calculated by using the travel time determined

Effects of Proteins on Metal Corrosion

October 16, 2008
Author(s)
H J. Mueller
A previous report (Mueller, IMS, Ottawa, Canada, 1998) revealed that the modeled equivalent electrical circuits for either silver or copper surfaces were different when corroded in protein-free or protein-containing solutions. The objective of this study

Effects of Random Localizing Events on Matter Waves: Formalism and Examples

October 16, 2008
Author(s)
J Gea-Banacloche
A formalism is introduced to describe a number of physical processes that may break down the coherence of a matter wave over a characteristic length scale l. In a second-quantized description, an appropriate master equation for a set of bosonic modes (such

Elastic and Anelastic Properties of a Copper-Precipited Alloy Steel

October 16, 2008
Author(s)
H M. Ledbetter, Sung Kim, H Ogi
We studied the elastic and anelastic properties of an alloy steel containing 1.1 mass % copper subjected to various isothermal agings. The steel's hardness increases with aging time; after reaching a maximum, it decreases. Peak hardness was 17% higher than

Elastic Coefficients of Monocrystal Gelena (Pbs)

October 16, 2008
Author(s)
Sudook A. Kim, H M. Ledbetter
Using acoustic-resonance spectroscopy, we measured the three independent Voigt C kj (C 11, C 12, C 44) of cubic-symmetry galena (lead sulphide). Our results clarify the discrepancies of previous reports. We report also the internal friction Q -1 ij, the

Elastic Constants and Thermal Expansion Averages of a Polycrystal

October 16, 2008
Author(s)
Roland deWit
This paper derives expressions for the overall average elastic constants and thermal expansion coefficients of a polycrystal in terms of its single crystal components. The polycrystal is assumed to be statistically homogeneous, isotropic, and disordered

Elastic Stiffnesses and Internal Frictions of Monocrystal Quartz

October 16, 2008
Author(s)
H M. Ledbetter, Sudook A. Kim, M Lei
Using acoustic-resonance spectroscopy (with only two point contacts with the specimen), we measured both the real and imaginary parts of the elastic-stiffness tensor C ij of a cultured quartz monocrystal. With trigonal symmetry (32 point group, P3 12 space

Elastic-Stiffness Coefficients of Titanium Diboride

October 16, 2008
Author(s)
H M. Ledbetter, Sudook A. Kim, T Tanaka
Using acoustic-resonance spectroscopy, we measured the monocrystal elastic-stiffness coefficients, the Voigt Cij, of TiB 2. With hexagonal symmentry, TiB 2 exhibits five independent C ij: C 11, C 33, C 44, C 66, C 13. Using Voigt-Reuss-Hill averaging, we
Displaying 29001 - 29025 of 74303