共查询到19条相似文献,搜索用时 140 毫秒
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“502滤纸贴显法”是我国手印工作者首创的显现技术。运用这一方法可显现诸多疑难客体上的潜在手印,但操作不当很容易造成显现失误,因此需提请同行注意: (1)对手印系统综合评断,确定正确的显现时间。 由于“502”贴显是在压缩显现空间的基础上进行的,因此灵敏度极高,显现速度很快。手印遗留客体表面的性状、手印物质量的多少以及手印遗留时间等环境因素均可能制约显现结果,而直 相似文献
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笔者在工作中,摸索出一种用“502”胶显现车辆内手印的方法。这种方法适用轿车、面包车、农用车、挖掘机等各类车辆(驾驶室)内的手印显现,通过控制车内温度和湿度,“502”胶熏显速度达到一个较好的显现效果。现以柳州五菱面包车为例进行实验。 相似文献
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本文利用纳米CdSe溶液显现了白色塑料、塑钢上面的油脂手印,比较了该试剂和传统试剂的增显效果,初步探讨了纳米CdSe溶液增强“502”胶显现手印的应用前景. 相似文献
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“502”胶液体显现潜手印技术的研究 总被引:4,自引:0,他引:4
目的研究探索"502"胶溶液显现手印的方法.方法以石油醚为分散剂,添加对苯二酚作为显现增强剂,配制"502"胶显现液.结果能够显现非渗透客体上油质加、减层手印、加减层混合手印及普通汗潜手印,其显现效果与"502"胶熏显法非常相似.结论该方法具有方便、快捷、灵敏等特点,是"502"胶显现手印技术的重要补充. 相似文献
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Lewis LA Smithwick RW Devault GL Bolinger B Lewis SA 《Journal of forensic sciences》2001,46(2):241-246
Chemical processes involved in the development of latent fingerprints using the cyanoacrylate fuming method have been studied. Two major types of latent prints have been investigated-clean and oily prints. Scanning electron microscopy (SEM) has been used as a tool for determining the morphology of the polymer developed separately on clean and oily prints after cyanoacrylate fuming. A correlation between the chemical composition of an aged latent fingerprint, prior to development, and the quality of a developed fingerprint has been observed in the morphology. The moisture in the print prior to fuming has been found to be more important than the moisture in the air during fuming for the development of a useful latent print. In addition, the amount of time required to develop a high quality latent print has been found to be within 2 min. The cyanoacrylate polymerization process is extremely rapid. When heat is used to accelerate the fuming process, typically a period of 2 min is required to develop the print. The optimum development time depends upon the concentration of cyanoacrylate vapors within the enclosure. 相似文献
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In this paper, we describe the development of a device for fuming fingerprints with cyanoacrylate (Super Glue) to enable police tactical units to obtain fingerprint evidence from suspicious packages using a remote-controlled robot. Through a series of initial experiments and preliminary designs, we show that effective cyanoacylate fuming requires sufficient heat, humidity, and airflow. This work led to the development of a final working prototype, called robot accessory for fuming fingerprint evidence (RAFFE), which is currently being field tested by the Calgary Police Service. 相似文献
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“502”真空熏显手印技术的应用现状 总被引:2,自引:0,他引:2
在我国,“502”加温加湿熏显手印技术已广为普及,但“502”真空熏显手印技术人们了解很少。本文通过介绍“502”熏显手印技术的发展,着重介绍真空熏显方法的特点。 相似文献
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“502”加膜一染色法显现油质手印 总被引:1,自引:0,他引:1
目的探索方便快捷并有效的油质手印显现方法。方法用“502”熏显常见玻璃、粗糙皮革等不同客体上不同遗留时间的油汗手印和多油手印,加染后用透明胶带粘取。结果显现了30天左右大多数非渗透性客体上的油质加层手印,10天左右渗透性客体上的油质渐层手印。结论本方法适用于油质加层手印及部分油质渐层手印的显现,显出手印清晰,流畅,不破坏手印。 相似文献
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《Science & justice》2014,54(5):356-362
Much information can be obtained from the chemical composition of a fingermark, which can be helpful in crime scene investigation. Immunolabeling can be used to extract information about the donor of the fingermark and it can also act as a fingermark development tool in sequence with the standard fingermark development techniques. However, before immunolabeling can be used in forensic practice more information on the possibilities and limitations of this technique is required. In this study, our aim was to investigate if immunolabeling is compatible with standard development protocols (indanedione-zinc, indanedione-zinc followed by ninhydrin spraying, physical developer, cyanoacrylate fuming, cyanoacrylate followed by basic yellow staining, lumicyanoacrylate fuming and polycyanoacrylate fuming). Immunolabeling was carried out successfully on all developed fingermarks, whereby dermcidin was selected as antigen of interest. We can conclude that immunolabeling is compatible with a wide variety of different fingermark developers. This finding in combination with previous findings, makes immunolabeling an interesting technique, which can be of great value in the forensic field. 相似文献
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Refreshing the Aged Latent Fingerprints with Ionizing Radiation Prior to the Cyanoacrylate Fuming Procedure: A Preliminary Study
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Mimoza M. Ristova Ph.D. Pavlina Radiceska M.Sc. Igorco Bozinov M.D. Lambe Barandovski Ph.D. 《Journal of forensic sciences》2016,61(3):787-791
One of the crucial factors determining the cyanoacrylate deposit quality over latent fingerprints appeared to be the extent of the humidity. This work focuses on the enhancement/refreshment of age‐degraded latent fingerprints by irradiating the samples with UV, X‐ray, or thermal neutrons prior to the cyanoacrylate (CA) fuming. Age degradation of latent fingerprints deposited on glass surfaces was examined through the decrease in the number of characteristic minutiae counts over time. A term “critical day” was introduced for the time at which the average number of identifiable minutiae definitions drops to one‐half. Fingerprints older than their “critical day” were exposed to either UV, X‐ray, or thermal neutrons. Identical reference samples were kept unexposed. All samples, both reference and irradiated, were developed during a single CA fuming procedure. Comparative latent fingerprint analysis showed that exposure to ionizing radiation enhances the CA fuming, yielding a 20‐30% increase in average minutiae count. 相似文献
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Abstract: Latent fingerprint visualization on discharged shell casings can provide good forensic evidence, particularly if the casing is recovered at the scene of a crime where a firearm has been discharged. Unfortunately, visualization of such latent fingerprints when they were deposited prior to discharge of the firearm is problematic as both increased temperature and abrasive friction can inhibit fingerprint visualization with conventional techniques. We present a case study that demonstrates latent fingerprint visualization on a discharged shell casing recovered 14 years ago from the scene of a homicide. Previous cyanoacrylate fuming of the casing had failed to reveal any fingerprints. We use a visualization technique in which a conducting carbon powder adheres preferentially to latent fingerprint corrosion of the casing surface, following the application of a potential of 2.5 kV to the casing. This technique presents opportunities for the review of old cases and for consideration of its use in current cases. 相似文献