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Displaying 56301 - 56325 of 74175

The ADACS Implementation of the UTAP Architecture

December 1, 1995
Author(s)
Robert Russell, John L. Michaloski, Keith A. Stouffer
The Advanced Deburring and Chamfer System is robotic workcell designed to put precision chamfers on parts made with hard metals. The project was funded by the United States Navy so that the technology developed could be applied to their air defense systems

Two-Tier Multiline TRL for Calibration of Low-Cost Network Analyzers

December 1, 1995
Author(s)
Jeffrey A. Jargon, Roger Marks
We compare calibrations for use on three-sampler vector network analyzers (VNAs), which do not allow the direct applica­tion of some advanced error-correction schemes such as TRL (thru-reflect-line). Here we compare various alternatives, including an

Visualization of Surface Figure Using Zernike Polynomials

December 1, 1995
Author(s)
Christopher J. Evans, R E. Parks, P Sullivan, John S. Taylor
Commercial software in modern interferometers used in optical testing frequently fit the wave-front or surface-figure error to Zernike polynomials; typically 37 coefficients are provided. We provide visual representations of these data in a form that may

Stylus Technique for Direct Verification of Rockwell Diamond Indenters

November 23, 1995
Author(s)
Jun-Feng Song, F Rudder, Theodore V. Vorburger, J Smith
Based on a stylus technique, a microform calibration system was developed at NIST for the direct verification of Rockwell diamond indenters. The least-squares radius and profile deviations, cone angle and cone flank straightness, and the holder axis

Ultrasound Power Measurement Techniques at NIST

November 12, 1995
Author(s)
Steven E. Fick
Megahertz-frequency sound waves with submillimeter wavelengths are widely used to probe the interior regions of many types of structures. When human tissues are exposed to ultrasound for diagnostic or therapeutic purposes, the applied power levels must be

Blind Estimation of Tip Geometry from Noisy Images

November 2, 1995
Author(s)
John S. Villarrubia
Broadening of image features due to non-vanishing tip size is a well-known imaging artifact in scanned probe microscopy (SPM) topographs. This need not be a serious limitation for some types of metrology (e.g. pitch or height), but it is significant for

Agent Stability Under Storage (NIST SP 890)

November 1, 1995
Author(s)
Richard H. Harris Jr.
Significant losses in fire suppression effectiveness and increases in toxicity are possible if a fire extinguishing agent degrades during multi-year storage. Halon 1301 is known to be stable in metal containers for many years, and any trace degradation

Conclusion.

November 1, 1995
Author(s)
Richard G. Gann
This report presents the results of two years of research in support of the objective to identify and make ready for use the optimal near-term fluid to replace halon 1301 for in-flight fire suppression in aircraft engine nacelles and dry bays. At the time
Displaying 56301 - 56325 of 74175
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