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Displaying 676 - 700 of 1415

Regimes of Surface Roughness Measurable with Light Scattering

January 1, 1993
Author(s)
Theodore V. Vorburger, Egon Marx, T Lettieri
In this paper we summarize a number of previous experiments on the measurement of the roughness of metallic surfaces by light scattering. We identify several regimes that permit measurement of different surface parameters and functions, and we establish

Accuracy, repeatability and interplatform reproducibility measurements of T 1 quantification methods used for DCE-MRI: results from a multicenter phantom study.

August 16, 2017
Author(s)
Octavia Bane, Stefanie J. Hectors, Mathilde Wagner, Lori L. Arlinghaus, Madhava P. Aryal, Yue Cao, Thomas L. Chenevert, Fiona Fennessy, Wei Huang, Nola M. Hylton, Jayashree Kalpathy-Cramer, Katy Keenan, Dariya I. Malyarenko, Robert V. Mulkern, David C. Newitt, Stephen E. Russek, Karl Stupic, Michael A. Boss
… repeatability, and interplatform reproducibility of T 1 quantification protocols used for dynamic contrast-enhanced MRI at 1.5 and 3 T. Methods: A T 1 phantom with 14 samples was imaged at eight centers with a common … and interplatform reproducibility measurements of T 1 quantification methods used for DCE-MRI: results from a …

Effect of P o2 and Ag on the Phase Formation of the Pb-2223 Superconductor

June 25, 1998
Author(s)
Winnie K. Wong-Ng, Lawrence P. Cook, W Greenwood
… have been studied for a precursor composition of Bi 1.8 Pb o.4 Sr 2 Ca 2.2 Cu 3 O x . The combined techniques of … volume: 2212-CuO-(ca,Sr) 2 CuO 3 -(Ca,Sr) 2 PbO 4 -(Sr,Ca) 14 Cu 24 O 41 , whereas under 7.5 volume % O 2 the five-phase … which produced metastable liquid was: CuO + 2212 + (Sr,Ca) 14 Cu 24 O 41 + (Ca,Sr) 2 PbO 4 > (Ca,Sr) 2 CuO 3 + L. Under …

Bounds on Permittivity Calculations using a TE 01d Dielectric Resonator

May 20, 2002
Author(s)
Jerzy Krupka, Kristof Derzakowski, Billy F. Riddle, James R. Baker-Jarvis, Robert N. Clarke, A. Abramowicz, O. C. Rochard
… not exceed 0.125% for a cavity-to-sample volume ratio of 1:64 and relative permittivity values in the range of 1 to 100. These results were obtained by employing 126 basis … Gdansk, 1, PL …

Updated system of S I levels using Fourier transform infrared spectroscopy in the (800-11000) cm-1 range

September 24, 2024
Author(s)
Alexander Kramida, S. Civis, E. M. Zanozina, J. Kubista, P. Kubelik, M. Ferus, V. E. Chernov
… chemistry, and combustion plasma physics. From the 14 newly measured non-penetrating (high-l) Rydberg levels we … first ionization energy of S atom,15 IE = 83559.170(11) cm−1, which is more accurate than the currently recommended value, 83559.1(10) cm−1,16 by two orders of magnitude. …

On-Wafer Capacitor Characterization Including Uncertainty Estimates Up to 1.0 THz

July 19, 2024
Author(s)
Robert Jones, Jerome Cheron, Benjamin Jamroz, Dylan Williams, Ari Feldman, Peter Aaen, Christian Long, Nathan Orloff
… interval that is 30.2% of the capacitor's value (14.9 ±4.5 fF) at 900 GHz with the uncertainty from probe … has been performed on characterizing on-wafer devices at 1 THz. We quantify the precision of current calibration … Characterization Including Uncertainty Estimates Up to 1.0 THz …

The NIST Plan for Providing Public Access to Results of Federally Funded Research

October 2, 2023
Author(s)
Katherine E. Sharpless, Regina L. Avila, Ronald F. Boisvert, A Kirk Dohne, James Fowler, Rachel B. Glenn, Gretchen Greene, Robert Hanisch, Andrea Medina-Smith, Alan Munter, Julie Petrousky, Yuri Ralchenko, Carolyn D. Rowland, James A. St Pierre, Adam Wunderlich, Jon Zhang
… plan was posted for public comment, which ended on August 14, 2023. This document is a collection of the plan, the …

High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels

October 15, 2021
Author(s)
Aly Artusio-Glimpse, Kyle Rogers, Paul A. Williams, John H. Lehman
… of kilowatt laser power with an uncertainty less than 1 %. These represent progress toward the most accurate measurements of laser power above 1 kW at 1070 nm wavelength and establish a more precise link … ratio in a radiation pressure-based measurement. With 14 incoherent reflections of the laser, we measure a total …

The Next Generation of Current Measurement for Ionization Chambers

September 1, 2020
Author(s)
Ryan P. Fitzgerald, Denis E. Bergeron, Dean G. Jarrett, Neil M. Zimmerman, Carine Michotte, Hansjoerg Scherer, Stephen Giblin, Steven Judge
… Metrology-quality systems must be precise and stable to 0.1% over many years, and linear from 10^(-14) A to 10^(-8) A. Thus, labs depend on bespoke current …

Precision Millimeter-Wave Modulated Wideband Source for Over-The-Air Reference at 92.4 GHz

April 22, 2020
Author(s)
Paritosh Manurkar, Robert D. Horansky, Benjamin F. Jamroz, Jeffrey A. Jargon, Dylan F. Williams, Catherine A. Remley
… communications electronics. In this work, we demonstrate a 1-GHz bandwidth, 64-quadrature- amplitude-modulated signal … obtain a nominal error vector magnitude (EVM) of 1.4%. Additionally, we track correlated and uncorrelated … of uncertainty of the EVM measurement in the range of 1.5%--3.1%. We examine the dependence of the EVM in the …
Displaying 676 - 700 of 1415
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