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 28051 - 28075 of 74024

The coefficient of thermal expansion of highly enriched 28Si

October 1, 2009
Author(s)
Ernest G. Kessler Jr., Guido Bartl, Arnold Nicolaus, Rene Schodel, Peter Becker
For the new definition of the SI-unit mass based on a fundamental constant, a redetermination of Avogadro s constant is the goal of an international collaboration of numerous national laboratories and universities. Since a relative uncertainty of about 2

The Dimensional Markup Language Specification for Inspection Results Data

October 1, 2009
Author(s)
William G. Rippey
The Dimensional Markup Language (DML) specification defines a data model and Extensible Model Language (XML) encoding rules for dimensional inspection results for discrete parts. To support manufacturing quality assurance processes, DML results files are

Traceable waveform calibration with a covariance-based uncertainty analysis

October 1, 2009
Author(s)
Paul D. Hale, Dylan F. Williams, Andrew M. Dienstfrey, Arkadiusz C. Lewandowski, Tracy S. Clement, Darryl A. Keenan
We describe a method for calibrating the voltage that a step-like pulse generator produces at a load at every time point in themeasured waveform. The calibration includes an equivalent-circuit model of the generator that can be used to determine how the

Uncertainty of timebase corrections

October 1, 2009
Author(s)
Chih-Ming Wang, Paul D. Hale, Dylan F. Williams
We develop a covariance matrix describing the uncertainty of a new timebase for waveform measurements determined with the National Institute of Standards and Technology's timebase correction algorithm. This covariance matrix is used with covariance

Update on DMIS Certification

October 1, 2009
Author(s)
William G. Rippey
The Dimensional Standards Consortium (DMSC) and the National Institute of Standards and Technology (NIST) announced the rollout of the DMSC's DMIS Certification Program at the International Manufacturing Technology Show (IMTS), September 2008. The

Vibration-induced PM and AM noise in microwave components

October 1, 2009
Author(s)
Archita Hati, Craig W. Nelson, David A. Howe
The performance of microwave components is sensitive to vibrations to some extent. Among them, microwave cables and connectors, bandpass filters, mechanical phase shifters and some non-linear components are the most sensitive. The local oscillator is one

Virtual Testing of Concrete Transport Properties

October 1, 2009
Author(s)
Dale P. Bentz, Edward J. Garboczi, Nicos Martys, Kenneth A. Snyder, W. S. Guthrie, Konstantinos Kyritsis, Narayanan Neithalath
The transport properties of concrete are critical to its field performance. Commonly encountered degradation mechanisms are dependent on ionic diffusivity, sorptivity, and permeability. In this paper, virtual testing of two of these concrete transport

Water Absorption in Internally Cured Mortar Made with Water-Filled Lightweight Aggregate

October 1, 2009
Author(s)
Ryan Henkensiefken, Javier Castro, Dale P. Bentz, Tommy Nantung, Jason Weiss
The increased propensity for shrinkage cracking in low w/c concrete has spawned the development of new technologies that can reduce the risk of early-age cracking. One of these is internal curing. Internal curing uses saturated lightweight aggregate to

A Novel Method to Covalently Functionalize Carbon Nanotubes with Isocyanates

September 30, 2009
Author(s)
Tinh Nguyen, Aline Granier, Kristen L. Steffens, Hajin Lee, Naomi Eidelman, Jonathan W. Martin
We have developed a novel method to covalently functionalize carbon nanotubes (CNTs) that carry free isocyanate (N=C=O) groups. NCO-functionalized CNTs (NCO-fCNTs) are very desirable, because the NCO group is highly reactive with hydrogen-active groups

First Measurement of Lyman Alpha X-ray Lines in Hydrogen-like Vanadium

September 30, 2009
Author(s)
John D. Gillaspy, C T. Chantler, D Paterson, Lawrence T. Hudson, F Serpa, E Takacs
The first measurement of hydrogen-like vanadium x-ray Lyman alpha transitions has been made. The measurement was made on an absolute scale, fully independent of atomic structure calculations. Sufficient signal was obtained to reduce the statistical

Gauging the Repeatability of 3D Imaging Systems by Sphere Fitting

September 30, 2009
Author(s)
Marek Franaszek, Geraldine S. Cheok, Kamel S. Saidi
Multiple scans of the same object acquired with 3D imaging system (e.g., laser scanner) in the same experimental conditions could provide valuable information about the instrument s performance (e.g., stability, existence of bias, measurement error)

Guidelines for Accepting 2D Building Plans (NIST IR 7638)

September 30, 2009
Author(s)
Geraldine S. Cheok, James J. Filliben, Alan M. Lytle
The General Services Administration's (GSA) Public Buildings Services manages 1600 buildings totaling 180, 000, 000 square feet. GSA’s ability to capture, validate, and report the spatial information of its building assets (e.g., dimensions, areas, and

Hostage Rescue Team Quick Capture Platform Use Case Document

September 30, 2009
Author(s)
Brian Stanton, Yee-Yin Choong, Mary Theofanos
The document defines functional requirements for the Quick Capture Platform (QCP). These requirements have been developed for a portable hardware device with screen size as small as 5"(W)x3"(H). Functional requirements are the definitions of specific

Photomask metrology using a 193 nm scatterfield microscope

September 30, 2009
Author(s)
Richard Quintanilha, Bryan M. Barnes, Martin Y. Sohn, Lowell P. Howard, Richard M. Silver, James E. Potzick, Michael T. Stocker
The current photomask linewidth Standard Reference Material (SRM) supplied by the National Institute of Standards and Technology (NIST), SRM 2059, is the fifth generation of such standards for mask metrology. The calibration of this mask has been usually

Quick Capture Platform Graphics

September 30, 2009
Author(s)
Brian C. Stanton, Yee-Yin Choong, Mary F. Theofanos, Patrick Hoffman
This document defines all of the graphic images for the quick capture platform. For each graphic we provide a description, the dimensions, the image, the image name, the use area and the filename containing the graphic image.

System and Network Security Acronyms and Abbreviations

September 30, 2009
Author(s)
Karen A. Scarfone, Victoria Thompson
This report contains a list of selected acronyms and abbreviations for system and network security terms with their generally accepted or preferred definitions. It is intended as a resource for Federal agencies and other users of system and network
Displaying 28051 - 28075 of 74024
Was this page helpful?