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NIST Authors in Bold

Displaying 1626 - 1650 of 2915

The Fast Fourier Transform for Experimentalists Part II: Convolutions

August 1, 2005
Author(s)
D Donnelly, Bert W. Rust
The discrete Fourier transform (DFT) is a widely used tool for the analysis of measured time series data. The Cooley-Tukey fast Fourier transform (FFT) algorithm gives an extremely fast and efficient implementation of the DFT. This is the first of a series

The Fast Fourier Transform for Experimentalists, Part I: Concepts

April 1, 2005
Author(s)
D Donnelly, Bert W. Rust
The discrete Fourier transform (DFT) is a widely used tool for the analysis of measured time series data. The Cooley-Tukey fast Fourier transform (FFT) algorithm gives an extremely fast and efficient implementation of the DFT. This is the first of a series

Detection Limit of Isotope Dilution Mass Spectrometry

August 1, 2002
Author(s)
Lee L. Yu, John D. Fassett, William F. Guthrie
The detection limit is an important figure of merit for evaluating instrumentation and analytical methods. While the detection limit for techniques using linear calibration functions has been studied extensively, this fundamental metric has rarely been

Strain Percolation: Physical Considerations

July 1, 2001
Author(s)
Lyle E. Levine, R M. Thomson, Y Shim
In previous papers, we have introduced a percolation model for the transport of strain through a deforming metal. In this paper, we review the results from that model, and discuss how the model can be applied to the deformation problem. We summarize the

Radiometry: Sensing the World

February 1, 2001
Author(s)
Steven W. Brown, Bettye C. Johnson, Keith R. Lykke
… programs to establish measurement chains between the fundamentals optical flux measurements to the more practical …

Particle Measurements in Fe(CO)5-Inhibited Flames (NISTIR 6242)

October 1, 1998
Author(s)
M D. Rumminger, Gregory T. Linteris
Since iron pentacarbonyl (Fe(CO)5) is among the most efficient flame inhibitors ever identified, research on flame inhibition by Fe(CO5) was recently started at NIST with the goal of understanding its mechanism. Obtaining a detailed understanding of this

Access Control on NoSQL Databases

May 7, 2024
Author(s)
Vincent C. Hu
NoSQL database systems and data stores often outperform traditional RDBMS in various aspects, such as data analysis efficiency, system performance, ease of deployment, flexibility/scalability of data management, and users' availability. However, with an

Experimental Realization of Neutron Helical Waves

May 11, 2022
Author(s)
Michael G. Huber, Charles W. Clark, Dmitry Pushin, Connor Kapahi, Lisa DeBeer-Schmitt, David Cory, Huseyin Ekinci, Melissa Henderson, Dusan Sarenac
Methods of preparation and analysis of structured waves of light, electrons, and atoms have been advancing rapidly. Despite the proven power of neutrons for material characterization and studies of fundamental physics, neutron science has not been able to

Dielectric-Loaded Microwave Rectangular Waveguide and Higher Order Modes Resonator

June 2, 2021
Author(s)
Christopher L. Holloway, Abdulaziz H. Haddab, Edward Kuester
Resonant transmission through a dielectric-loaded slot in a thick conducting diaphragm embedded in a rectangular waveguide is modeled using an analytical approximation based on the slot being small compared to a free space wavelength. Image theory relates

Development and Applications of a Fiber-Coupled Atom-Based Electric Field Probe

August 26, 2018
Author(s)
Christopher L. Holloway, Matt Simons, Josh Gordon
We are developing a fundamentally new atom-based approach for electric (E) field measurements. This new approach will lead to a self-calibrated, SI traceable, E-field measurement, and has the capability to perform measurements on a fine spatial resolution

Bound electron nonlinearity beyond the ionization threshold

May 2, 2018
Author(s)
Jared K. Wahlstrand, Sina Zahedpour, Anand Bahl, Miroslav Kolesik, H M. Milchberg
Although high field laser-induced ionization is a fundamental process at the root of many applications, there have been no absolute measurements of its transient rate. Such information is crucial, for example, for understanding the propagation of high

Energy Renormalization to Coarse-Graining of the Dynamics of a Model Glass-Forming Liquid

February 5, 2018
Author(s)
Wenjie Xia, Jake Song, Nitin Hansoge, Frederick R. Phelan Jr., Sinan Keten, Jack F. Douglas
Soft condensed matters characteristically exhibit a strong temperature dependence of relaxation properties due to glass formation, but currently no effective temperature transferable coarse- graining method exists that allows for the prediction of their

Structure and Order in Organic Semiconductors

January 17, 2017
Author(s)
Chad R. Snyder, Dean M. DeLongchamp, Ryan C. Nieuwendaal, Andrew A. Herzing
Several techniques for characterizing semiconducting polymer order on different length scales are presented, including (1) differential scanning calorimetry (DSC), (2) solid state nuclear magnetic resonance spectroscopy (NMR), (3) transmission electron

Principles of Optical Radiometry and Measurement Uncertainty

November 27, 2014
Author(s)
Bettye C. Johnson, Howard W. Yoon, Joseph P. Rice, Albert C. Parr
The fundamental concepts of optical radiometry are developed from basic principles, with detailed explanations for radiance, irradiance, and reflectance. Examples of radiometric standards, in particular radiometers and reference sources are given, and the
Displaying 1626 - 1650 of 2915
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