000 02296nam a2200241 4500
001 393397
090 _a393397
100 _a20150721d2014 y0pory50 ba
101 _aeng
200 _aConsecutive and random manufactured semi-automatic pistol breech face and fired cartridge case evaluations
_bRecurso eletrónico
_efinal report
_fAshley Chu ...[et al.]
210 _a[Rockville, MD]
_cNational Criminal Justice Reference Service (NCJRS)
_d2014
215 _a1 CD-ROM
_d12 cm
300 _aResearch report submitted to the U.S. Department of Justice. NIJ Award Number: 009-DN-BX-K168. Ficheiro de 2,41 MB em formato PDF (60 p.).
330 _aThis report describes our work on the evaluation of the impression markings on cartridge cases fired from semi-automatic pistols to determine to what extent these markings can be used to individualize a firearm and whether they can be quantified in terms the possibility that it occurred by random chance. We have been able to demonstrate that the size of the individual regions of corresponding topography on the breech faces of cartridge cases fired from the same slides were consistently larger than those that were consecutively manufactured and that there are other aspects to the matching that are not reflected by cross correlation analysis. The conclusions that can be drawn from this work are that the differences between the cross-correlation coefficients from matching and non-matching cartridge cases can not only be increased by focusing on particular sized regions of correspondence but that other approaches such as pattern recognition can also be effectively used to supplement the cross correlation techniques. Thus by modifying the algorithms that determine the similarities it should be possible to increase the number of cartridge cases that can be added to a database before it will be overwhelmed by false positives.
606 _aBALÍSTICA
_9320585
606 _aARMA DE FOGO E MUNIÇÕES
_9343053
606 _aMARCAÇÃO DE OBJECTOS
_9343973
606 _aANÁLISE LABORATORIAL
_9326721
710 _aCONSECUTIVE AND RANDOM MANUFACTURED SEMI-AUTOMATIC PISTOL BREECH FACE AND FIRED CARTRIDGE CASE EVALUATIONS
_9357802
955 _xOferta