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.
An official website of the United States government
Here’s how you know
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.
This is a preliminary study of lead and bismuth selinides and tellurides to determine the usefullness of these materials as Pb and Bi standards for quantitative
In this paper two questions are addressed: (1) what is precision measurement? And (2) where do ideas come from? To answer these questions, research examples are
V Ferreiro, Jack F. Douglas, Alamgir Karim, G Coulon
Many industrial applications require a control of the morphology of thin polymer films. The morphology of thin polymer films depends on many factors : method of
We demonstrate here the feasibility of valence mapping of particulate samples, and discuss the factors that limit quantitative data extraction from the maps
Phosphor Imaging Plate Technology is applied to electron beam scattering in the Environmental Scanning Electron Microscope. The plate is exposed to primary and
Lispix is a public domain image processing system designed for use by microscopists. It runs on both Windows and Macintosh. Some of its features are described.
This paper reviews recent studies on self-setting calcium phosphate cements (CPC). Discussions are focused on the cement setting reactions, the products formed
Joseph M. Antonucci, Drago Skrtic, A W. Hailer, E D. Eanes
Amorphous calcium phosphate (ACP), an important precursor in the biological formation of hydroxyapatite (HAP), has recently been utilized as a bioactive filler
Joseph M. Antonucci, J W. Stansbury, Bruce O. Fowler
HEMA is widely used in dental adhesives, bioactive composites and resin-modified glass ionomer cements. In its polymeric forms it is used in a number of
The moment magnitude (MW) 7.4 Kocaeli, Turkey, earthquake struck the Kocaeli province of northwestern Turkey on Tuesday, August 17, 1999 at 3:02 a.m. local time
We present three tests for evaluating the agreement between measurements taken in a reverberation chamber and the expected results given by simple statistical
One approach to measuring the performance of intelligent systems is to develop standardized or reproducible tests. These tests may be in a simulated environment
A large number of path planning problems are solved by the use of graph based search algorithms. There are a variety of techniques available to optimize the
Increased public awareness and changing industry standards have highlighted the importance of indoor air quality in the building design process. At the same
Research into intelligent systems and intelligent control is burgeoning. However, there is no consensus on how to define or measure an intelligent system. This
The American Society of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) is in the process of revising Standard 62 Ventilation for Acceptable
We describe hardware time synchronization instrumentation that we have developed which achieves time synchronization of better than one microsecond. The purpose
Robert T. Johnk, David R. Novotny, Claude Weil, H. W. Medley
This paper summarizes a recent measurement effort by NIST researchers at an open-area test site (OATS), operated by a large information technology equipment
A number of factors promote frequent running of performance measurement codes for the evaluation and tuning of both applications and platforms. NIST is
The Blends of two statistical copolymers of ethylene/hexene (PEH) and ethylene/butene (PEB) exhibit both phase separation and crystallization transitions. Using
G Schmidt, A Nakatani, Paul Butler, Alamgir Karim, Charles C. Han
The shear orientation of viscoelastic clay-polymer solutions was investigated by means of rheology, flow birefringence (δn) and small-angle neutron scattering
Spinodal dewetting of ultra thin films driven by thermal fluctuations is considered analogous to phase separation accompanied by composition fluctuations. Such
David A. Wollman, Dale Newbury, Sae Woo Nam, Gene C. Hilton, Kent D. Irwin, David A. Rudman, Steven Deiker, Norman F. Bergren, John M. Martinis
The commercial introduction of high-count-rate, near-room-temperature silicon drift detectors (presently available) and high-energy-resolution cryogenic