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Author: xiaoyu zheng
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Displaying records 1 to 10 of 26 records.
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1. 2D and 3D Topography Comparisons of Toolmarks Produced from Consecutively Manufactured Chisels and Punches.
Published: 5/20/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Robert Meryln Thompson, John Villanova, Taher Kakal
Abstract: A 2009 report by the National Academies [1] recommended strengthening the scientific basis of procedures and criteria employed by the forensic science specialty of toolmark identification. The current method of comparison and determination of ide ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914887

2. NIST SURFACE ROUGHNESS AND STEP HEIGHT CALIBRATIONS, Measurement Conditions and Sources of Uncertainty
Published: 3/18/2014
Authors: Theodore Vincent Vorburger, Thomas B Renegar, Xiaoyu A Zheng, Jun-Feng Song, Johannes A Soons, Richard M Silver
Abstract: NIST methods for calibration of surface roughness parameters and step height are described. The surface roughness parameters currently being measured include roughness average (Ra), root mean square (rms) roughness (Rq), average maximum height of the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915207

3. Applications of Surface Metrology in Firearm Identification
Published: 1/8/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Theodore Vincent Vorburger, Jun-Feng Song, Thomas B Renegar, Robert Meryln Thompson
Abstract: Surface metrology is commonly used to characterize functional engineering surfaces. The technologies developed offer opportunities to improve forensic toolmark identification. Toolmarks are created when a tool comes into contact with a surface an ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914401

4. Applications of Surface Metrology in Toolmark Identification
Published: 1/8/2014
Authors: Xiaoyu A Zheng, Johannes A Soons, Theodore Vincent Vorburger, Jun-Feng Song, Thomas B Renegar, Robert Meryln Thompson
Abstract: Surface metrology is commonly used to characterize functional engineering surfaces. The technologies developed offer opportunities to improve forensic toolmark identification. In 2009, a report by the National Academies called into question, amon ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913337

5. Two Applications of Small Feature Dimensional Measurements on a CMM with a Fiber Probe
Published: 9/4/2013
Authors: Eric S Stanfield, Balasubramanian Muralikrishnan, Theodore D Doiron, Xiaoyu A Zheng, Shahram Orandi, david Duquette
Abstract: We describe two interesting applications of dimensional measurements performed using a contact fiber probe on a commercial Coordinate Measuring Machine (CMM). Both examples involve artifacts that serve as material standards and contain features in th ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913578

6. The Effect of Tip Size in Calibration of Surface Roughness Specimens with Rectangular Profiles
Published: 9/2/2013
Authors: Jun-Feng Song, Thomas B Renegar, Johannes A Soons, Balasubramanian Muralikrishnan, John S Villarrubia, Xiaoyu A Zheng, Theodore Vincent Vorburger
Abstract: For the calibration of rectangular and trapezoidal profile roughness specimens, stylus tip will increase profile peak width and decrease valley width, which may cause the Ra changes (either increase or decrease, depends on the profile shape). Someti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911850

7. Applications of Profile Filtering in the Dimensional Metrology of Fuel Cell Plates
Published: 5/14/2013
Authors: Balasubramanian Muralikrishnan, Wei Ren, Eric S Stanfield, Dennis S Everett, Xiaoyu A Zheng, Theodore D Doiron
Abstract: We describe the application of several surface profile filters as an enabling tool in the dimensional measurements of an engineering artifact, namely, a fuel cell plate. We recently reported work on the development of a non-contact system for dimensi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913301

8. Topography Measurements and Performance Comparisons between NIST SRM 2460 Standard Bullet Masters and BKA Bullet Replicas
Published: 7/31/2012
Authors: Jun-Feng Song, Theodore Vincent Vorburger, Robert Meryln Thompson, Susan M Ballou, Xiaoyu A Zheng, Thomas B Renegar, Richard M Silver
Abstract: Two Standard Reference Material (SRM) 2460 Bullets produced by the National Institute of Standards and Technology (NIST) were used as masters for the fabrication of replica bullets at the Bundeskriminalamt (BKA). The surface topography of the SRM ma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908222

9. Confocal Microscopy Analysis of Breech Face Marks on Fired Cartridge Cases from Ten Consecutively Manufactured Pistol Slides
Published: 7/1/2012
Authors: Xiaoyu A Zheng, Robert Meryln Thompson, Todd Weller
Abstract: Ten (10) pistol slides with consecutively manufactured breech faces, were obtained from Sturm, Ruger Co, Inc. A total of nine (9) test fires from each pistol, for a total of ninety (90) test fired cartridge cases, were compared using comparison micr ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=906690

10. Development of Ballistics Identification ‹ From Image Comparison to Topography Measurement in Surface Metrology-
Published: 3/22/2012
Authors: Jun-Feng Song, Theodore Vincent Vorburger, Robert Meryln Thompson, Thomas B Renegar, Xiaoyu A Zheng, James H Yen, Richard M Silver, Wei Chu
Abstract: Fired bullets and ejected cartridge cases have unique ballistics signatures left by the firearm. By analyzing the ballistics signatures, forensic examiners can trace these bullets and cartridge cases to the firearm used in a crime scene. Current au ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908043



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