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You searched on: Author: jun-feng song

Displaying records 11 to 20 of 129 records.
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11. 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

12. Proposed NIST Ballistics Identification System (NBIS) Based on 3D Topography Measurements on Correlation Cells
Published: 5/17/2013
Author: Jun-Feng Song
Abstract: The invented ,NIST Ballistics Identification System (NBIS)Š using three-dimensional (3D) topography measurements on correlation cells can promote high accuracy and fast ballistics identifications [1]. The use of paired correlation cells can identify ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910868

13. 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

14. 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

15. 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

16. 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

17. 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

18. Selecting Valid Correlation Areas for Automated Bullet Identification Systems Based on Striation Detection
Published: 5/1/2011
Authors: Wei Chu, Jun-Feng Song, Theodore Vincent Vorburger, Robert Meryln Thompson, Richard M Silver
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905104

19. 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

20. Striation Density for Predicting the Identifiability of Fired Bullets
Published: 9/1/2010
Authors: Wei Chu, Jun-Feng Song, Theodore Vincent Vorburger, Susan M Ballou
Abstract: Without a selection procedure to exclude the bullets having insufficient individualized ballistics signature, automated ballistics identification systems will correlate an evidence bullet with all reference bullets stored in the database. Correlation ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901713



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