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Search Publications by: Howard W. Yoon (Fed)

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Displaying 76 - 100 of 141

Advances in Radiometry for Ocean Color

November 10, 2003
Author(s)
Steven W. Brown, D K. Clark, Bettye C. Johnson, Howard W. Yoon, Keith R. Lykke, S Flora, M Feinholz, N Souaidia, C Pietras, Thomas C. Stone, M Yarbrough, Y S. Kim, R Barnes, J Mueller
Organic materials in the oceans have spectral signatures based on their light-scattering properties. These optical properties are related to bio-physical and bio-chemical data products, such as the concentration of phytoplankton chlorophyll-α, through bio

Thermal Imaging of Metals in a Kolsky-Bar Apparatus

October 1, 2003
Author(s)
Howard W. Yoon, D Basak, Richard L. Rhorer, Eric P. Whitenton, Timothy J. Burns, Richard J. Fields, Lyle E. Levine
For materials testing at elevated temperatures, we describe the design and the development of a resistively heated Kolsky-bar apparatus. The temperature of the sample is determined by non-contact thermometry and the spatial temperature gradients in the

Temperature Scales Using Radiation Thermometers Calibratied From Absolute Irradiance and Radiance Responsivity

August 21, 2003
Author(s)
Howard W. Yoon, David W. Allen, Charles E. Gibson, Robert D. Saunders, Bettye C. Johnson, Steven W. Brown, Keith R. Lykke
In the International Temperature Scale of 1990 (ITS-90), temperatures above the freezing temperature of silver are defined with radiation thermometers calibrated using spectral radiance ratios to one of the silver-, gold- or copper-freezing temperature

Kolsky Bar With Electrical Pulse Heating of the Sample

June 1, 2003
Author(s)
Eric P. Whitenton, Michael Kennedy, Matthew A. Davies, Gerald V. Blessing, Brian S. Dutterer, Richard L. Rhorer, Howard W. Yoon, Lyle E. Levine, Richard J. Fields, D Basak, Timothy J. Burns
The accuracy of simulations for modeling of machining processes is often limited due to insufficient knowledge of the material properties during machining, which can involve strain rates on the order of 104 per second or higher, plus rapid material heating

A SURF Beamline for Synchrotron Source-Based Absolute Radiometry

February 1, 2003
Author(s)
Ping-Shine Shaw, Uwe Arp, Howard W. Yoon, Robert D. Saunders, Albert C. Parr, Keith R. Lykke
A new source-based radiometry beamline at Synchrotron Ultraviolet Radiation Facility (SURF III) was constructed recently. The goal of this beamline is to establish a national source standard with wide spectral range from far UVto IR by using the

Calibrated thermal microscopy of the tool-chp interface in machining

January 1, 2003
Author(s)
Matthew A. Davies, Howard W. Yoon, Tony L. Schmitz, Timothy J. Burns, Michael Kennedy
This paper presents the results of calibrated, microscopic measurement of the temperature fields at the tool-chip interface during the steady-state, orthogonal machining of AISI 1045 steel. The measurement system consists of a nearly diffraction limited

Constitutive Model Data for Machining Simulation Using the NIST Pulse-Heat Kolsky Bar

January 1, 2003
Author(s)
Eric P. Whitenton, Michael Kennedy, Matthew A. Davies, Gerald V. Blessing, Brian S. Dutterer, Richard L. Rhorer, Howard W. Yoon, Richard J. Fields, D Basak, Timothy J. Burns
A new facility for dynamic material testing using a traditional Kolsky bar with the addition of controlled electrical-resistive pulse heating has been established at the National Institute of Standrds and Technology (NIST). Dynamic stress-strain data have