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Displaying 51 - 75 of 422

The Calculation of CMM Measurement Uncertainty via The Method of Simulation by Constraints

January 1, 1997
Author(s)
Steven D. Phillips, Bruce R. Borchardt, Daniel S. Sawyer, William T. Estler, David E. Ward, K Eberhardt, M. Levenson, Marjorie A. McClain, B Melvin, Ted Hopp, Y Shen
The calculation of task specific measurement uncertainty when using coordinate measuring machines is an important and challenging task. Current methods to address this issue use simulation techniques (e.g., the virtual CMM) where the propagation of known

TEST AND CALIBRATION OF DISPLACEMENT MEASURING LASER INTERFEROMETERS

October 15, 2014
Author(s)
Jack A. Stone Jr.
At the National Institute of Standards and Technology (NIST), we have a capability to calibrate and test laser interferometer systems used to measure displacements. Recently our calibration protocol has been modified so as to bring it into accord with a

A Constrained Monte Carlo Simulation Method for the Calculation of CMM Measurement Uncertainty

January 1, 1999
Author(s)
Steven D. Phillips, Bruce R. Borchardt, Daniel S. Sawyer, William T. Estler, K Eberhardt, M Levenson, Marjorie A. McClain, Ted Hopp
We describe a Monte Carlo simulation technique where known information about a metrology system is employed as a constraint to distinguish the errors associated with the instrument under consideration from the set of all possible instrument errors. The

Micro Cryogenic Coolers for IR Imaging

April 29, 2011
Author(s)
Ryan J. Lewis, Yunda Wang, Jill Cooper, Mu Hong Lin, Victor M. Bright, Yung-Cheng Lee, Peter E. Bradley, Ray Radebaugh, Marcia L. Huber
… an emphasis on: 1) high thermal isolation levels reaching 89,000 K/W; 2) custom-designed gas mixtures with …

A Channel Propagation Model for the 700 MHz Band

September 1, 2010
Author(s)
Camillo A. Gentile, Nada T. Golmie, Catherine A. Remley, Christopher L. Holloway, William F. Young
… through a stepped-frequency system. The campaign includes 89 transmitter-receiver configurations in seven different …

An Investigation of Refrigerant Void Fraction in Horizontal, Microfin Tubes

January 1, 2001
Author(s)
David A. Yashar, M J. Wilson, HM R. Kopke, D M. Graham, J C. Chato, TJD A. Newell
A series of experiments to determine void fraction in both condensation and evaporation have been performed in horizontal microfin tubes with refrigerants R134a and R410A. Mass flux varied from 75 kg/m2-s to 700 kg/m2-s and average test section quality

Enthalpies of Formation in the Pseudobinary LaAl x Ni 5-x System

December 1, 2000
Author(s)
R Klein, P A. O'Hare, I Jacob
… K) were determined by solution calorimetry in HCl (c = 6 mol dm -3 ) to be -(129.4 +6.5) kJ mol -1 for x = 0.25; -(159.5 + 15.9) kJ mol -1 for x = 0.25; -(185.9 + 6.7) kJ mol -1 for x = 0.375; -(191.8 + 12.4) kJ mol -1 for x …

Magnetoelastic Coupling in La 0.7 Ca 0.3 MnO 3 /BaTiO 3 Ultrathin Films

October 11, 2013
Author(s)
A. Alberca, N. M. Nemes, F. J. Mompean, Titusz Feher, Ferenc Simon, J. Tornos, C. Leon, C. Munuera, Brian Kirby, M. R. Fitzsimmons, A. Hernando, J. Santamaria, M. Garcia-Hernandez
The magnetism of La 0.7Ca 0.3MnO 3 (LCMO) expitaxial thin films grown SrTi 3 (STO)and BaTiO 3 (BTO) substrates is studied using Polarized Neutron Reflectometry (PNR) and Ferromagnetic Resonance (FMR) techniques. PNR reveals a strongly suppressed

Structure and Microwave Dielectric Properties in the x Ca 2 AlNbO 6 : (1-x) Ca 3 Nb 2 O 8 System

February 1, 2000
Author(s)
Julia Y. Chan, Terrell A. Vanderah, Robert S. Roth, Winnie Wong-Ng, B A. Reisner, Richard G. Geyer
… a = 5.3785(1) , b = 5.4158(1) , c = 7.6259(1) , b = 89.93(1)o) is a double perovskite with structure similar to … er < 39) and low dielectric loss (7000 < Q x f < 14000 at 6 GHz). At the composition near x = 0.6, the relative permittivity is 26 with Df near 0 ppm at 7 …

Surface resistance and morphology of YBCO films as a function of thickness

June 1, 1997
Author(s)
F. J. Stork, James A. Beall, Alexana Roshko, Donald C. DeGroot, David A. Rudman, Ronald H. Ono, Jerzy Krupka
… YBa 2 Cu 3 O 7-x films with transition temperatures over 89 K and critical current densities greater than 10 6 A/cm2 at 76 K. The thickness was varied from 50 to 1600 nm …
Displaying 51 - 75 of 422
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