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Author: walter liggett jr

Displaying records 11 to 20 of 26 records.
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11. Capability in Rockwell C Scale Hardness
Published: 7/1/2000
Authors: Walter S Liggett Jr, Samuel Rea Low III, David J Pitchure, Jun-Feng Song
Abstract: A measurement system is capable if it produces measurements with uncertainties small enough for demonstration of compliance with product specifications. To establish the capability of a system for Rockwell C scale hardness, one must assess measuremen ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=821003

12. SRM 2806 (ISO Medium Test Dust in Hydraulic Oil): A Particle-Contamination Standard Reference Material for the Fluid Power Industry
Published: 8/1/1999
Authors: Robert A Fletcher, Jennifer R Verkouteren, Eric S Windsor, David S. Bright, Eric B Steel, John A Small, Walter S Liggett Jr
Abstract: Standard Reference material (SRM) 2806 is composed of ISO medium test dust (ISO 12103-A3), a mineral dust, suspended in MIL-H-5606 hydraulic oil. SRM 2806 is a traceable particle count standard and is certified for number of particles larger than ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=831080

13. Rockwell Hardness - A Method-Dependent Standard Reference Material
Published: 7/1/1999
Authors: Samuel Rea Low III, R J. Gettings, Walter S Liggett Jr, Jun-Feng Song
Abstract: Rockwell hardness is not a fundamental physical property of a material. It is a method-dependent measurement of the deformation of the material to an applied force. There are no alternative measurement systems to directly or independently measure R ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852924

14. Rockwell Hardness - A Method-Dependent Standards Reference Material
Published: 7/1/1999
Authors: Samuel Rea Low III, R Gettings, Walter S Liggett Jr, Jun-Feng Song
Abstract: Rockwell hardness is a method-dependent measurement of the deformation of a material in response to an applied force. It is not a fundamental physical property of a material. There are no alternative measurement systems to directly or independently m ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820937

15. Topic By Topic Performance of Information Retrieval Systems
Published: 6/4/1999
Author: Walter S Liggett Jr
Abstract: Formulation of topic properties is the goal of this paper. These properties are to be used in judging the difficulty of topics appropriate to the Text REtrieval Conference (TREC) ad hoc task. Applying statistical methods to both TREC-6 and TREC-7 in ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151396

16. Assessment Error Sources in Rockwell Hardness Measurements
Published: 6/1/1999
Authors: Walter S Liggett Jr, Samuel Rea Low III, David J Pitchure, Jun-Feng Song
Abstract: In the use of hardness test blocks, the uncertainty due to block non-uniformity can be reduced if one is willing to make measurements at specified locations on the blocks. Statistical methods for achieving this reduction are explained in this paper. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=820936

17. A New Method of Certifying Standardized Rockwell Hardness Test Blocks
Published: 9/1/1998
Authors: Samuel Rea Low III, Walter S Liggett Jr, David J Pitchure
Abstract: Rockwell hardness test blocks, whether standardized at the primary national laboratory level or by secondary commercial laboratories, have been certified historically by determining an average hardness value for the test surface of the block. Howeve ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852885

18. Data Selection for Broadcast News CSR Evaluations
Published: 8/1/1998
Authors: W M Fisher, Walter S Liggett Jr, A N Le, Jonathan G Fiscus, D S Pallett
Abstract: Composition of the 1997 Hub-4 broadcast news test set is discussed. The composition is based on concurrent selection of a statistically equivalent test set for a future evaluation, adjustment of the set to match the training data, and other consider ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151366

19. Insights From the Broadcast News Benchmark Tests
Published: 6/8/1998
Authors: Walter S Liggett Jr, W M Fisher
Abstract: The broadcast news benchmark tests have potential as a source of ideas for improving continuous speech recognition systems. This paper presents a data analysis method for uncovering such ideas and applies the method to the 1996 and 1997 DARPA CSR Hu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=151359

20. Measurement Traceability of NIST Standard Rockwell Diamond Indenters
Published: 1/1/1998
Authors: Jun-Feng Song, Samuel Rea Low III, Walter S Liggett Jr, David J Pitchure, Theodore Vincent Vorburger
Abstract: A metrology-based Rockwell hardness scale is established by a standard machine and a standard diamond indenter. Both must be established through force and dimensional metrology with acceptably small measurement uncertainties. In 1994, NIST develope ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=823113



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