数码照相机与视频荧光鉴别仪的物证检验应用比较

索尼SONY WVC-CD300数码照相机与SYJ-5型视频荧光鉴别仪应用在文件检验时,视频荧光鉴别仪部分功能可用 该种数码照相机代替,各具特色。     

A Study of the Presence of Gunshot Residue in Pittsburgh Police Stations using SEM/EDS and LC‐MS/MS

Due to possible secondary transfer of gunshot residue (GSR) onto a suspect in police custody prior to sampling, a baseline must be created for the amount of GSR present. With an increase of “lead free” ammunition, testing for both gunpowder and primer GSR is relevant. Seventy samples were collected using carbon‐coated adhesive stubs from four Pittsburgh Police Stations and vehicles to investigate these locations as sources of secondary GSR contamination. These seventy samples were analyzed for primer GSR using scanning electron microscopy‐energy‐dispersive X‐ray spectrometry. One primer GSR particle was detected; no sample was classified as positive for primer GSR. These same samples were then analyzed for gunpowder GSR using liquid chromatography coupled to tandem mass spectrometry to test for akardite II, ethylcentralite, diphenylamine, N‐nitrosodiphenylamine, 2‐nitrodiphenylamine, and 4‐nitrodiphenylamine. Ethylcentralite was quantifiable in two test samples. These results suggest there is a negligible potential for secondary transfer of primer and gunpowder GSR.     

关于ERP与CPS测谎技术的心理测量学差异的研究

事件相关电位心理测试技术与传统的多道心理生理测试技术相比,遵循着不同的基本原理和机制,由此带来二者在心理测量学上的差异。文章拟从心理测量学的行为样本、标准化、难度客观性测量以及信度、效度五个方面来分析两种测试方式的差异。     

Automated SEM/EDS Analysis of Airbag Residue.* I: Particle Identification

Abstract: Deployed airbags can be a valuable source of probative forensic materials. During an accident, trace evidence can be deposited on the airbag cover and in addition, the residue produced by the gas generation system is released into the passenger compartment of the vehicle as the airbag deflates. This residue can be used to associate a suspect with the vehicle at the time of the accident. This study identifies particles containing zirconium, strontium, and/or copper–cobalt along with other elements from the gas generation systems and aluminum silicon microfibers from airbag filters as the probative material which may be produced and deposited on a suspect’s hands and/or clothing. Scanning electron microscopy can be used to identify this metallic residue. Modification of the search criterion used for gunshot residue analysis allows for automated analysis of the samples. Proper collection of the airbag standard is essential to identify which materials were produced. Prompt collection of suspect samples allows the analysts the ability to make the proper identifications and associations. This analytical technique can be a probative tool in criminal investigations.     

便携式血液中CO检测仪的研制与应用研究

目的 依据分光光度计还原法原理,利用微型锂电池、传感器、全分析系统,研制特定波长便携式血液中CO检测仪.方法 选择以发光二极管(LED)为光源的单光源模式,以比色皿为样品池,设置内部参比,对光强进行校正.整个系统进行集成,实现数据采集、信号处理和运算一体化,直接显示测定结果.结果 最终形成体积小、质量轻、操作简便、检测...     

呼吸线长(RLL)在评图中的应用

心理生理测谎技术经历了一个从生理指标体系逐渐建立,到测试方法日趋完善的进程。而呼吸线长作为心理生理测谎技术中的一个指标是霍华德·特姆博士首次提出的,后来呼吸线长便成为用于计算呼吸反应强度的生理数据。呼吸线长就是一种测量发生在特定时间内呼吸活动的反应强度的方法,在测量呼吸线长过程中,一个更好的选择就是利用计算机进行测量。     

测谎技术之优越性和局限性

测谎技术是复杂并且有争议的方法 ,但也是目前在侦查、执法和作证程序中被广泛使用的方法。实践表明 ,在适宜的场合恰当的使用时 ,它有很高的准确率 ,但也会被滥用和曲解 ,有许多关于其信度、效度和使用方法的不真实的报道。测谎技术的优越性和局限性何在 ,需要我们以实案运用为依托作进一步的探讨。     

Police officers’ judgements of veracity,tenseness, cognitive load and attempted behavioural control in real-life police interviews

Abstract

The present experiment examined the apparently incongruent findings that police officers (i) believe that suspects show nervous behaviour when they lie but (ii) seem able to detect deceit in suspects who do not show nervous behaviours. It was hypothesized that police officers’ judgements about whether a suspect is lying would not be correlated with their judgements regarding whether the suspect is tense, but, instead, would be correlated with their judgements regarding whether suspects are having to think hard or attempting to control their behaviour.

Each of 84 police officers saw seven truths and seven lies told by suspects during their police interviews. Participants in Condition 1 were asked to indicate after each clip whether the suspect was lying, whereas participants in Condition 2 were asked to note after each clip to what extent the suspect appeared to be tense, having to think hard or attempting to control their behaviour. Condition 3 was a combination of Conditions 1 and 2 and participants were asked all the above questions. The findings support the hypotheses and therefore negate the assumption that police officers primarily look for cues of nervousness when they attempt to detect deceit.