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Author: xiaoyu zheng

Displaying records 11 to 20 of 26 records.
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11. Stylus Tip-Size Effect on the Calibration of Periodic Roughness Specimens with Rectangular Profiles
Published: 3/21/2012
Authors: Thomas B Renegar, Johannes A Soons, Balasubramanian Muralikrishnan, John S Villarrubia, Xiaoyu A Zheng, Theodore Vincent Vorburger, Jun-Feng Song
Abstract: Stylus instruments are widely used for surface characterization. It is well known that the size and shape of the stylus tip affects the measured surface geometry and parameters. In most cases, increasing the tip size decreases the measured Ra value b ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911079

12. The National Ballistics Imaging Comparison (NBIC) Project
Published: 3/10/2012
Authors: Jun-Feng Song, Theodore Vincent Vorburger, Susan M Ballou, Robert Meryln Thompson, James H Yen, Thomas B Renegar, Xiaoyu A Zheng, Richard M Silver, Martin Ols
Abstract: In response to the guidelines issued by the ASCLD/LAB-International (American Society of Crime Laboratory Directors/Laboratory Accreditation Board) to establish traceability and quality assurance in U.S. crime laboratories, a NIST/ATF joint project e ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907871

13. An Iterative Algorithm for Calculating Stylus Radius Unambiguously
Published: 9/24/2011
Authors: Theodore Vincent Vorburger, Xiaoyu A Zheng, Thomas B Renegar, Jun-Feng Song, Li Ma
Abstract: The stylus radius is an important specification for stylus instruments and is commonly provided by instrument manufacturers. However, it is difficult to measure the stylus radius unambiguously. Accurate profiles of the stylus tip may be obtained by ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=907724

14. GEOMETRICAL MEASUREMENTS OF NIST SRM ROCKWELL HARDNESS DIAMOND INDENTERS
Published: 11/21/2010
Authors: Jun-Feng Song, Samuel Rea Low III, Xiaoyu A Zheng
Abstract: The geometric parameters of 28 candidate Standard Reference Material (SRM) Rockwell hardness diamond indenters are calibrated by an automated system recently developed at the National Institute of Standards and Technology (NIST). The calibration res ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906117

15. Topography measurements for correlations of standard cartridge cases
Published: 7/1/2010
Authors: Theodore Vincent Vorburger, Jun-Feng Song, Wei Chu, Thomas B Renegar, Xiaoyu A Zheng, James H Yen, Robert Meryln Thompson, Richard M Silver, Benjamin Bachrach, Martin Ols
Abstract: NIST Standard Reference Materials (SRM) 2460 Standard Bullets and 2461 Standard Cartridge Cases are intended for use as check standards for crime laboratories to help verify that their computerized optical imaging equipment for ballistics image acqui ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905846

16. Applications of Cross-Correlation Functions
Published: 4/14/2010
Authors: Theodore Vincent Vorburger, Jun-Feng Song, Wei Chu, Li Ma, Xiaoyu A Zheng, Thomas B Renegar, Son H Bui
Abstract: We describe several examples where we use cross-correlation functions to quantify the similarity of 2D surface profiles or of 3D surface topography images. The applications have included 1) the manufacture of Standard Reference Material (SRM) bullet ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902481

17. Three steps towards metrological traceability for ballistics signature measurements
Published: 2/1/2010
Authors: Jun-Feng Song, Theodore Vincent Vorburger, Robert Meryln Thompson, Thomas B Renegar, Xiaoyu A Zheng, Li Ma, James H Yen, Martin Ols
Abstract: The National Institute of Standards and Technology (NIST) in collaboration with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) has developed the Standard Reference Material (SRM) 2460 bullets and 2461 casings. NIST and ATF are propos ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901492

18. Traceability for Ballistics Signature Measurements in Forensic Science
Published: 12/1/2009
Authors: Jun-Feng Song, Theodore Vincent Vorburger, Susan M Ballou, Li Ma, Thomas B Renegar, Xiaoyu A Zheng, Martin Ols
Abstract: The National Institute of Standards and Technology (NIST) in collaboration with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) has developed the Standard Reference Material (SRM) 2460 Bullets and 2461 Casings. NIST has also developed ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=824703

19. NIST SRM (Standard Reference Material) 2460/2461 Standard Bullets and Casings Project
Published: 10/13/2009
Authors: Jun-Feng Song, Thomas B Renegar, Xiaoyu A Zheng, Robert Meryln Thompson, Richard M Silver, Martin M Ols, Ted T Vorburger
Abstract: The National Institute of Standards and Technology (NIST) in collaboration with the Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) has developed the Standard Reference Material (SRM) 2460 Bullets and 2461 Cartridge Cases. NIST has also d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903625

20. GEOMETRIC MEASUREMENT COMPARISONS FOR ROCKWELL DIAMOND INDENTERS
Published: 9/6/2009
Authors: Jun-Feng Song, Samuel Rea Low III, Xiaoyu A Zheng
Abstract: In the uncertainty budget of Rockwell C hardness (HRC) tests, geometric error of the Rockwell diamond indenter is a major contributor. The geometric calibration of Rockwell diamond indenters has been a key issue for Rockwell hardness standardization ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902704



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