Chemical fingerprinting of adhesive tapes by GCMS detection of petroleum hydrocarbon products

Pressure-sensitive adhesive tapes often represent key evidence of crimes such as assault, rape or homicide; thus, the development of analytical techniques able to contribute to a detailed characterization of these materials is of forensic importance. The gas chromatography-mass spectrometry (GCMS) analysis of the solvent extractable fractions of a suite of electrical and gaffer adhesive tapes spanning a range of colors and manufacturers identified a number of petroleum-derived hydrocarbons. Molecular and isotopic analyses of hydrocarbon constituents of complex materials have found wide analytical utility including the forensic investigation of oil spills and arson. Here, we investigate the utility of these techniques for characterizing the hydrocarbon composition of pressure-sensitive adhesive tapes for forensic correlation purposes. Subtle distinction of tape samples was evident in the GCMS distribution of several hydrocarbon groups including alkyl-naphthalenes, hopane and sterane biomarkers. Linear discriminant analysis of the abundances of these products provided high level differentiation of tape manufacturer. The distinction of different adhesive tape samples was further extended by measurement of their stable carbon isotopic values. The molecular and isotopic differences of the petroleum content of tapes are consistent with the use of different petroleum materials used in the manufacturing process and demonstrate the benefits of the combined use of complementary oil hydrocarbon characterization approaches. This study reveals the forensic potential of using established petroleum characterization methods for characterizing materials with a petroleum-derived hydrocarbon element.     

Elite-public interaction on twitter: EU issue expansion in the campaign

Why do some issues receive more interest from the public, while others do not? This paper develops a theoretical and empirical approach that explains the degree to which issues expand from the elite to the public. We examine how candidates in the 2014 European Parliament elections talked about EU issues, in comparison to other political issues. We rely on data collected from Twitter and use a combination of human coding and machine learning to analyse what facilitates interactions from the public. We find that most political actors did not try to engage with the public about EU issues, and lack of engagement results in less interactions from the general public. Our findings contribute to understanding why EU issues still play a secondary role in European politics, but at the same time highlight what low-cost communicational tools might be useful to overcome this expansion deficit.     

论《著作权法》对“网播”的规制

“网播”不是“网络传播”的缩略语,也不包括“网络转播”,而是指通过网络实施的初始非交互式传播。修改前的《著作权法》对广播权的定义移植自《伯尔尼公约》的规定,不能规制“网播”,当时只能对“网播”适用“兜底权利”。《著作权法》修改后,广播权被改造为涵盖以任何技术手段进行非交互式传播的专有权利,可以规制“网播”。其规制范围不限于传播作品创作完成时的原始形态,还包括传播作品的表演和表演的录制品。     

Assessment of the Effects Exerted by Acid and Alkaline Solutions on Bone: Is Chemistry the Answer?

The treatment of corpses with extremely acid or basic liquids is sometimes performed in criminal contexts. A thorough characterization by chemical analysis may provide further help to macroscopic and microscopic analysis; 63 porcine bone samples were treated with solutions at different pH (1–14) for immersion periods up to 70 days, as well as in extremely acidic sulfuric acid solutions (9 M/18 M) and extremely basic sodium hydroxide. Inductively coupled optical emission spectrometry (ICP‐OES)/plasma mass spectrometry (ICP‐MS), Fourier transform infrared spectroscopy (FT‐IR), energy dispersive X‐ray analysis (EDX), X‐ray powder diffraction (XRPD), and scanning electron microscopy (SEM) showed that only the sulfuric acid solution 18 M was able to completely dissolve the sample. In addition, chemical analysis allowed to recognize the contact between bone and substances. Hydrated calcium sulfate arose from extreme pH. The possibility of detecting the presence of human material within the residual solution was demonstrated, especially with FT‐IR, ICP‐OES, and EDX.     

‘Catching’ and ‘Targeting’: Risk‐Based Policing,Local Culture and Gendered Practices

The aim of this article is to explore cultural and practical aspects of the growing use of information and communication technology (ICT) in policing. By using empirical research on policing in Norway, the focus will be on how ICT is used as a crime prevention instrument in everyday police work and culture. The transition, which the new technologies mediate, will be explored by focusing on concepts of risk and materialization of risk‐based policing at the practice level in two cases: 1) a special unit fighting serious and organized crime utilizing proactive policing methods, police informers, crime profiling and databases, and 2) a police station focusing on low‐level crime by using a problem‐oriented policing model, transmitting responsibility for personal security onto identified ‘problem‐owners’.1 ‘Problem‐owner’ is a notion used by the police in the two cases. It is referring to the POP‐model, and whom they identify as important to participate in the risk‐management. According to Wright (: 121): “Partnership refers to a purposeful relationship between the police and the public or between the police and other agencies in the field.” Based on an examination of risk phenomena as contextual, embedded in practice and cultural settings, various stories about risk management will be told. The stories reflect different control strategies in the crime control discourses, and point to how risk‐based technologies are shaped and adapted in occupational culture and practice. The article illuminates the importance of studying the empirical complexity ICT is used in, and looks towards, to paraphrase O'Malley and Palmer (), ‘firewalls of resistance’ in the local occupational culture, that are preventing full integration of risk tools.     

公安民警开展心理行为训练相关问题的研究

本论文采用文献法、问卷调查法、实践法、数理统计法,对如何科学、合理、有效地开展公安民警心理行为训练和设置训练内容进行了研究。研究结果表明,心理行为训练应根据不同警种对不同心理品质强化的需求安排、调整训练内容。同时,应将心理评估纳入到心理行为训练之中;训练中要协调好团队训练与关注个人的关系;把心理行为训练与心理学知识普及结合在一起;使受训民警掌握一定的自我训练方法,有助于心理行为训练的后期效果巩固,避免训练效果短暂而不能持久。     

“台湾人”群体对中国大陆的刻板印象

当代台湾已经形成"台湾人群体",而视大陆人为"他群",他们对大陆的刻板印象多是负面的,从而形成偏见与歧视,对两岸关系造成严重的伤害。这是在两岸关系和平发展进程中,必须关注的一个问题。本文探讨"台湾人群体"对大陆的刻板印象的具体表现及其危害,并且针对现阶段两岸交流的情况,分析其对减少刻板印象的作用与局限,认为通过两岸群际沟通减少刻板印象,进而减少偏见与歧视需要经过相当长的过程,至于增强两岸认同,形成"两岸共同体"更需要走很长的路。     

Neutral heroin impurities from tetrahydrobenzylisoquinoline alkaloids

Laudanosine, reticuline, codamine, and laudanine are members of the tetrahydrobenzylisoquinoline family of natural products. These alkaloids are present in the opium poppy, Papaver somniferum, and are subsequently found as impurities in clandestinely processed morphine. Morphine is then synthesized to heroin using hot acetic anhydride. During the course of this study, it was determined that these four tetrahydrobenzylisoquinolines undergo degradation to a series of 18 neutral impurities when subjected to hot acetic anhydride. Based on the degradation pathway, these new impurities were categorized into two sets of impurities called the C1-acetates compounds and the stilbene compounds. Synthesis, isolation, and structural elucidation information is provided for the tetrahydrobenzylisoquinoline alkaloids, and the new neutral impurities have been studied. Several hundred authentic heroin samples were analyzed using an established heroin signature program method. This methodology features the detection of trace neutral impurities present in heroin samples. It was determined that all 18 new impurities were detected in various quantities in four different types of heroin samples. Analytical results featuring these new impurities are reported for South American-, Southwest Asian-, Mexican-, and Southeast Asian-type heroin samples. These new impurities, coupled with other established forensic markers, enhance the ability to classify illicit heroin samples.     

A rapid test for heroin (3,6-diacetylmorphine) based on two chemiluminescence reactions

A rapid method for screening drug seizure samples for 3,6-diacetylmorphine (heroin), which consists of a simple hydrolysis procedure and flow-injection analysis with two chemiluminescence reagents, is described. Before hydrolysis, 3,6-diacetylmorphine evokes an intense response with a tris(2,2'-bipyridyl)ruthenium(III) reagent (prepared by dissolving the perchlorate salt in acetonitrile), and a relatively weak chemiluminescence response with a second reagent: potassium permanganate in an aqueous acidic polyphosphate solution. However, the permanganate reagent is extremely sensitive toward the hydrolysis products of 3,6-diacetylmorphine (i.e., 6-monoacetylmorphine and morphine). Some compounds commonly found in drug laboratories may cause false positives with tris(2,2'-bipyridyl)ruthenium(III), but do not produce the markedly increased response with the permanganate reagent after the hydrolysis procedure. The combination of these two tests therefore provides an effective presumptive test for the presence of 3,6-diacetylmorphine, which we have verified with 14 samples obtained from a forensic science laboratory.     

Issue Convergence in Presidential Campaigns

This effort seeks to expand our understanding of the supply-side of the campaign process by investigating how candidate competition for agenda control affects occurrences of issue convergence (the discussion of the same issues by competing candidates) in campaigns for the presidency. More specifically, I integrate hypotheses suggested by extant literature into a framework that captures the factors that motivate presidential candidates selection of issues and the factors that affect their decisions to address issues also discussed by their opponents. These hypotheses are tested with duration analysis and data gathered from all available campaign advertisements produced by candidates competing in the 1976 through 1996 presidential elections. The results indicate that occurrences of issue convergences are quite frequent in presidential campaigns and that candidates decisions to address the same issues are affected by an issues saliency and partisan ownership, as well by changes in the campaign environment.