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.
Robert J. Espejo, Shellee D. Dyer, Mikael Svalgaard,
We demonstrate accurate measurements of the longitudinal refractive index profile of a fiber Bragg grating (FBG). We measure the impulse response of a grating
Many integration projects today rely on shared semantic models based on standards represented using Extensible Mark up Language (XML) technologies. Shared
Hierarchical production planning provides a formal bridge between long-term plans and short-term schedules. A hybrid, simulation-based, production planning
We present limitations on the characterization and use of molecular absorption lines for wavelength calibration purposes. These limits assume a Doppler and
Brian Washburn, Scott Diddams, Nathan R. Newbury, Jeffrey W. Nicholson, Feder Kenneth, Paul S. Westbrook, C. G. Jorgensen
A phase-locked, all-fiber supercontinuum source based on an ultrashort fiber ring laser with a tunable repetition frequency is presented. The supercontinuum
The paper presents a comparable evaluation of isobutane (R600a), propane (R290), R134a, R22, R410A, and R32 in an optimized finned-tube evaporator, and analyzes
C Hackman, Judah Levine, Tom Parker, Dirk Piester, Juergen Becker
GPS carrier-phase time transfer (GPSCP1T) offers high frequency stability at short averaging times, approaching a fractional frequency stability of 10-15 at
In this paper, we examine the issues that arise in the experimental study of integrated cognitive systems. We review the reasons why such artifacts are dicult
In this paper, we evaluate the performance of an iterative registration algorithm for position estimation of Unmanned Ground Vehicles (UGVs) operating in
The U.S. Department of Transportation is actively involved in assessing the benefit of road departure warning systems (RDWS). A crash prevention boundary (CPB)
This paper provides twenty rules of thumb for comparing algorithms having the same function, one of which is to be selected for use in an intelligent system
John Kitching, Svenja A. Knappe, Li-Anne Liew, P Schwindt, V Shah, John Moreland, Leo W. Hollberg
The physics package of a vertically-integrated chip-scale atomic clock based on Cs has recently been demonstrated at NIST. This device requires 69 mW of
Eric A. Burt, William Klipstein, Steven R. Jefferts
The Primary Atomic Reference Clock in Space (PARCS) is a collaboration between the National Institute of Standards and Technology (NIST), the Jet Propulsion
Thomas P. Heavner, Steven R. Jefferts, Elizabeth A. Donley, Jon H. Shirley, Thomas E. Parker
Over the last several years we have made many improvements to NIST-F1 (a laser-cooled cesium fountain primary frequency standard) resulting in a reduction in
Diagnosis of secondary pediatric pulmonary hypertension is often difficult because no single test permits complete evaluation. Improved understanding of the
Archita Hati, Craig Nelson, J Nava, David A. Howe, Fred L. Walls
We discuss the performance of a W-band (92 to 96 GHz) PM and AM noise measurement system. The system uses two nearly identical channels to measure the AM or P M
Theo1 is the first new species of variance that addresses a particularly difficult measurement problem, namely, obtaining reliable estimation of frequency
Svenja A. Knappe, P Schwindt, V Shah, Leo W. Hollberg, John Kitching, Li-Anne Liew, John Moreland
We report on the fabrication of a physics package for a chip-scale atomic clock with a volume of 9.5 mm^3, consuming 75 m W of power. The design is described in
Theoretical variance #1 (Theo1) has been developed at NIST to improve the estimation of long-term frequency stability. Its square-root (Theo1-dev) has two
Ultrasonic (U5) assessment of fracture risk in osteoporotic patients is based on measurements of broadband ultrasonic attenuation and speed-of-sound (505) of
Proton transfer in bacteriorhodopsin from the cytoplasm to the extracellular side is initiated from protonated asp96 in the cytoplasmic region towards the
Perry F. Wilson, Christopher L. Holloway, Galen H. Koepke
In this paper we will review dipole models for correlating measurements made at various electromagnetic compatibility (EMC) test facilities. We will present
We describe temperature-dependent photon antibunching measurements from single InGaAs/GaAs quantum dots. The second order intensity correlation demonstrates