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.
Since the Guide to the Expression of Uncertainty in Measurement (GUM) was published in 1993 it has changed the evaluation of physical and chemical measurements
Ray Radebaugh, Yonghua Huang, Agnes A. O'Gallagher, John M. Gary
Previously we have shown that the lower volumetric heat capacity and more ideal behavior of helium-3 compared with helium-4 at 4 K results in an improved
Paul C. DeRose, Lili Wang, Adolfas K. Gaigalas, Gary W. Kramer, Ute Resch-Genger, Ulrich Panne
The need for standardization in fluorescence measurements to improve quality assurance and to meet regulatory demands is addressed from the viewpoint of
There are three digital forensic science projects: National Software Reference Library (NSRL), Computer Forensic Tool Testing (CFTT), Computer Forensic
An introduction to some basic concepts and building blocks that facilitate the understanding of atomic scale dynamics at surfaces is presented. The focus is
The objective in this chapter is to present the current situation in RFID systems and networked transducers and to indicate the strategy that is taken and
Robert Keller, Donna C. Hurley, David T. Read, Paul Rice
This chapter describes metrologies developed by NIST scientists and collaborators for mechanical properties of dimensionally-constrained materials; these
Far-infrared (Terahertz or THz) spectroscopic investigations of condensed-phase biological and model organic species including substituted benzenes, amino acids
John J. Kasianowicz, Jeffrey C. Lerman, Sarah E. Henrickson, Martin Misakian, Rekha Panchal, Kelly Halverson, Sina Bavari, Tam Nguyen, Rick Gussio, Devanand K. Shenoy, Vincent M. Stanford
Protein ion channels are nanometer-scale pores that are central to many biological processes, including the sensing of a wide variety of molecules. They have
Daniel G. Friend, Bruce E. Poling, George H. Thomson, Thomas E. Daubert, Evan Buck
This Section provides tabular material for the physical and chemical properties of substances of interest to the chemical engineering community. Many of the
The combination of MEMS fabrication with atomic clocks has enabled a new generation of small, cheap, low-power devices. Since the proposal of chip-scale atomic
In VNA measurements, the magnitude and phase of a transmitted or reflected wave are measured relative to that of the incident wave. VNA measurements are made a
There are several computational approaches for predicting gas-phase, molecular thermochemistry. For common organic compounds, empirical methods are quick to
Samuel L. Manzello, John R. Shields, Jiann C. Yang, Yoshihiko Hayashi, Daisaku Nii
An experimental apparatus has been constructed to generate a controlled and repeatable size and mass distribution of glowing firebrands. The present study
Nelson P. Bryner, Daniel M. Madrzykowski, William L. Grosshandler
On February 20, 2003, during a band performance, pyrotechnics ignited foam insulation lining the walls and ceiling of the platform that was being used as a
Nelson P. Bryner, Daniel M. Madrzykowski, William L. Grosshandler
On February 20, 2003, during a band performance, pyrotechnics ignited foam insulation lining the walls and ceiling of the platform that was being used as a