Development of a GC-MS method for the simultaneous analysis of latent fingerprint components

Latent fingerprint residue is a complex mixture of organic and inorganic compounds. A full understanding of the composition of this mixture and how it changes after deposition is lacking. Three solvent systems were compared for the simultaneous extraction and derivatization with ethyl chloroformate of selected amino and fatty acids from a nonporous substrate (Mylar for subsequent analysis by gas chromatography-mass spectrometry. A solvent system comprised of sodium hydroxide, ethanol, and pyridine was found to be the most effective. This method was applied to the analysis of latent fingerprint residue deposited on Mylar and preliminary data are presented. Twelve amino acids (e.g., serine, glycine, and aspartic acid) and 10 fatty acids (e.g., tetradecanoic, hexadecanoic, and octadecanoic acids) were identified. The potential application of this method to further the understanding of latent fingerprint chemistry has been demonstrated.     

论青春期未成年人越轨行为预防

青春期未成年人处于身体和心理发展的关键阶段,也是越轨行为的易发年龄段,做好青春期未成年人越轨行为的预防,对青少年的犯罪防控有重要意义。本项目对初中三年级5594名学生进行了样本调查,发现青春期未成年人越轨行为出现了一些值得关注的新问题。学校、家庭仍然注重以分数排名次、以分数论好坏,这种做法对年轻一代的负面作用正进一步显现。预防未成年人的越轨行为是犯罪预防的重要基础,社会有关各方应合力预防未成年人的越轨行为,从基础建设上为减少青少年的犯罪创造条件。     

准大学毕业生离校前夕越轨行为研究 --以江苏Y高校为例

准大学毕业生离校前夕越轨现象引起了社会的广泛关注,其越轨行为集中表现为酗酒滋事、破坏物品等形式;解释该行为主要有宣泄说、社会控制说、标签透视说、从众说、边际说等理论视角;为妥善解决这一难题,准大学毕业生需加强自律和心理调适,高校应加强就业指导,社会应积极提供舆论环境支持。     

对我国公共政策执行偏差的探析

公共政策实践中出现的各种重大问题愈来愈密切地与政策执行相关。在达到政策目标的过程中,方案确定的功能只占10%,而其余的90%取决于有效的执行。一项政策出台后,只有通过正确的执行才能达到政策的目标。能否正确执行并规避偏差,直接决定了公共政策的存在价值和价值的实现。     

A DUAL‐SYSTEMS APPROACH FOR UNDERSTANDING DIFFERENTIAL SUSCEPTIBILITY TO PROCESSES OF PEER INFLUENCE

The distinct peer‐based perspectives of deviant normative influence and unstructured/unsupervised socializing with friends contend that adolescents rely on different information when deciding to offend, with the former positing that individuals offend after considering the longer term consequences of behavior, and the latter positing that decisions to offend derive from situational stimuli. We argue that these processes can be organized under a dual‐systems framework of decision making, which leads to the hypothesis that individuals at the edges of impulsivity should be differentially vulnerable to these peer influence processes because of their tendency to rely on only one system of decision making. We use two large data sets to test this hypothesis: a nationally representative sample of adolescents from the AddHealth study (N = ～9,000) and a pooled panel data set of adolescents from the Gang Resistance Education and Training (G.R.E.A.T.) evaluation (N = 1,172). The results of longitudinal negative binomial analyses indicate that normative influence by deviant peers has a stronger effect on delinquency for adolescents with low impulsivity than it does for individuals with high impulsivity. Differences in the informal socializing with peers coefficients are less clear and offer minimal support for our predictions.     

IN AND OUT OF HARM'S WAY: VIOLENT VICTIMIZATION AND THE SOCIAL CAPITAL OF FICTIVE STREET FAMILIES*

Homeless youth establish a variety of relationships with people they meet on the street. These associations generate different levels of the intangible resources of trust, commitment, and reciprocity that contribute to a person's social capital. We argue that the relationships homeless youth describe as “street families” resemble the fictive kin common among people who have limited resources, and that these relationships are a greater source of social capital than are other associations. Social capital may improve access to many valued outcomes, including protections. Regression analyses of violent victimization support our argument, demonstrating that fictive street families keep youth out of harm's way more than do other street associations.     

Combination of Face Regions in Forensic Scenarios

This article presents an experimental analysis of the combination of different regions of the human face on various forensic scenarios to generate scientific knowledge useful for the forensic experts. Three scenarios of interest at different distances are considered comparing mugshot and CCTV face images using MORPH and SC face databases. One of the main findings is that inner facial regions combine better in mugshot and close CCTV scenarios and outer facial regions combine better in far CCTV scenarios. This means, that depending of the acquisition distance, the discriminative power of the facial regions change, having in some cases better performance than the full face. This effect can be exploited by considering the fusion of facial regions which results in a very significant improvement of the discriminative performance compared to just using the full face.     

Youthful animal abuse and later problem behavior outcomes: findings from two generations

The objective of this study was to document the long-term relationship between youthful animal abuse and a variety of problem behavior outcomes later in life. Data were used from a national, longitudinal, and multigenerational sample collected by the National Youth Survey Family Study, which assessed families across 27 years from 1977 to 2004. The analytic sample consisted of 2538 individuals who were analyzed using multivariate ordinary least squares and logistic regression modeling that controlled for important demographic factors. Hypotheses were tested across two generations separately showing that a history of animal abuse does, indeed, predict later problem behaviors, including serious offending, marijuana use, other drug use, alcohol use, and deviant beliefs. Depending on the outcome examined, each model accounts for 5–34% of the variation in respondents’ problem behaviors. Within each model, animal abuse was often one of the strongest predictors. Implications of these findings, the study’s limitations, and future research directions are discussed.     

CRIMINAL PROPENSITY,DEVIANT SEXUAL INTERESTS AND CRIMINAL ACTIVITY OF SEXUAL AGGRESSORS AGAINST WOMEN: A COMPARISON OF EXPLANATORY MODELS*

Three hypotheses have been used to describe the male propensity for sexual aggression towards women: a general propensity to offend, a specific propensity to sexually offend and a combination of both. In this paper, using structural equation modeling, we compared the relative utility of these three hypotheses in explaining criminal activity in adulthood of sexual aggressors of women. In total, 209 adult males who were convicted of at least one sexual offence were included in the study. Results indicate that a propensity model emphasizing the role of an early and persistent general propensity to act in an antisocial manner during childhood and adolescence is most adequate to explain sexual aggressors' criminal activity. After controlling for the role of this propensity, a specific propensity characterized by high sexualization and deviant sexual interests explained only a modest proportion of variance of the sexual criminal activity.     

UPLC-MS/MS法检测血痕中常见烟草、毒品和药物成分

目的建立UPLC-MS/MS测定血痕中尼古丁、可替宁、甲基苯丙胺、氯胺酮、吗啡、O6-单乙酰吗啡、地西泮、三唑仑、艾司唑仑、佐匹克隆和利血平的方法。方法以甲醇为提取液,采用基质提取溶液配制标准溶液制作定量曲线。采用超高效液相色谱柱对待测样品进行分离;以电喷雾离子源正离子（ESI＋）模式和多反应监测（MRM）模式进行质谱分析。优化实验条件,并进行方法学评价。结果选择UPLC HSS T3色谱柱,乙腈-5mmol/L甲酸铵＋0.1%（v/v）甲酸作为流动相,甲醇作为提取溶剂。11种检测物检出限（S/N=3）和定量限（S/N=10）分别为0.04~2.82ng和0.13~7.64ng,1~500ng/mL范围内的线性关系良好。除利血平、吗啡外的检测物回收率为（53.8±5.3）%~（107.2±12.6）%。结论采用本文UPLC-MS/MS方法对血痕中11种常见烟草、毒品和药物成分进行检测,能够满足实际检案的要求,可在相关检验中选用。