尸检样本乙醇分析结果的解释策略

由于死后各种复杂的人为现象的存在,使得建立死后血液酒精含量(BAC)和死亡时醉酒状态之间的关系十分困难。在日常检案中必须考虑细菌污染、发酵是否引起死后乙醇再合成,死亡时胃中未被吸收的乙醇是否向周围组织以及血中扩散等问题。本文总结了关于死后乙醇分析及结果解释相关问题的研究文献,旨在为从事法医毒物学乙醇分析的同行在调查此类案件时提供良好的开端。     

The Characterization of 3,4-Dimethylmethcathinone (3,4-DMMC)

Analogs and derivatives of traditional illicit drugs are ever increasing in variety and creativity. Staying abreast of the new developments is a constant challenge for every forensic laboratory. Recently, a seizure from Australian Customs Service presented our laboratory with the designer cathinone 3,4-dimethylmethcathinone (3,4-DMMC). Gas chromatography/mass spectrometry (GC/MS), liquid chromatography/mass spectrometry (LC/MS), nuclear magnetic resonance (NMR) spectroscopy, infrared (IR) spectroscopy, and ultraviolet (UV) spectrophotometry were employed to analyze the spectroscopic characteristics of this cathinone. As an analog, 3,4-DMMC exhibits similar if not identical IR and UV profiles to mephedrone (4-MMC) and methcathinone; however, the retention time from GC is unique as expected, and the electron impact fragmentation pattern is consistent with the fragmentation pattern of other cathinones. The chemical shifts of the carbons and hydrogens were assigned by both one- and two-dimensional NMR techniques, while the molecular weight was confirmed by LC/MS.     

From child maltreatment to violent offending: an examination of mixed-gender and gender-specific models

Research suggests that child maltreatment predicts juvenile violence, but it is uncertain whether the effects of victimization persist into adulthood or differ across gender. Furthermore, we know little about the mechanisms underlying the victim-perpetrator cycle for males and females. Consequently, this study analyzed associations between child maltreatment and a number of adult measures of violent offending within mixed-gender and gender-specific models. Along with main effects, the study directly tested the moderating effects of gender on the maltreatment-violence link and analyzed theory-informed gender-specific mediators. Data were derived from the Chicago Longitudinal Study, a panel investigation of 1,539 low-income minority participants born in 1979 or 1980. Child welfare, juvenile court, and criminal court records informed the study's explanatory and outcome measures. Prospectively collected covariate and mediator measures originated with parent, teacher, and self-reports along with several administrative sources. Results indicated that child maltreatment, ages 0 to 11, significantly predicted all study indicators of violence in the full sample and most study outcomes in the male and female subsamples. In no instance did gender moderate the maltreatment-violence association. Late childhood/early adolescence environmental instability, childhood externalizing behaviors, and adolescent peer social skills fully mediated the maltreatment-violence nexus among males. Adolescent externalizing behavior partially mediated the relationship of interest among females. Evidence also indicated that internalizing processes protected females who had been maltreated in childhood against perpetrating violence later in life. Implications of results are discussed.     

Nano-scale composition of commercial white powders for development of latent fingerprints on adhesives

Titanium dioxide based powders are regularly used in the development of latent fingerprints on dark surfaces. For analysis of prints on adhesive tapes, the titanium dioxide can be suspended in a surfactant and used in the form of a powder suspension. Commercially available products, whilst having nominally similar composition, show varying levels of effectiveness of print development, with some powders adhering to the background as well as the print.X-ray fluorescence (XRF), analytical transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and laser particle sizing of the fingerprint powders show TiO₂ particles with a surrounding coating, tens of nanometres thick, consisting of Al and Si rich material, with traces of sodium and sulphur. Such aluminosilicates are commonly used as anti-caking agents and to aid adhesion or functionality of some fingerprint powders; however, the morphology, thickness, coverage and composition of the aluminosilicates are the primary differences between the white powder formulations and could be related to variation in the efficacy of print development.     

Exploring FDR'S relationship with the press: A historical agenda‐setting study

This historical agenda‐setting study examined the extent to which Franklin Roosevelt's issue agenda, as expressed in his first seven State of the Union speeches, correlated with subsequent coverage in seven major newspapers and the degree to which newspaper coverage correlated with FDR's issue agenda. While past works have emphasized Roosevelt's ability to influence media coverage, this study suggests that Roosevelt reacted to previous coverage more than he influenced subsequent coverage. Past researchers contend that Roosevelt's strong support early in his first term deteriorated subsequently. By contrast, our study found stronger correlations between FDR's issue agenda and subsequent coverage later in his presidency. FDR reacted to, rather than influenced, coverage in newspapers he read and influenced coverage in newspapers he did not read. Roosevelt's issue agenda posted stronger correlations for the papers that supported him than those that opposed him. This study suggests, then, that historical conditions, amount of exposure to the newspaper, and political leanings of the newspaper are contingent conditions influencing the agenda‐setting process and should be considered in future agenda‐setting studies.     

National health insurance: Some lessons from the Canadian experience

In the current American debate over national health insurance an examination of the Canadian governmental experience is very instructive. Canada is enough like the United States to make the effects of Canadian health insurance policies rather like a large natural experiment. The Canadian experience—universal government health insurance administered by the ten provinces with some fiscal and policy variations—can be used to predict the impact in the United States of proposed national health insurance plans on the medical care system, and the reaction of mass publics and national policymakers to these effects.The central purpose of the Canadian national health insurance was to reduce and hopefully eliminate financial barriers to medical care. In this it succeeded. But it also produced results which Canadian policymakers never anticipated: essentially unexpected side-effects on cost, quality, organization, and manpower distribution of the particular national health insurance program adopted. It should be cause for concern, the article concludes, that most of the prominent American national health insurance proposals resemble the Canadian program in failing to provide a single level of government with both the means and incentives to curb the inflationary effects of national health insurance. The lesson from Canada is that unless the system has very strong anti-inflationary mechanisms and incentives built into it, national health insurance will feed the fires of medical inflation despite great formal governmental authority to control it.     

The residential preferences of blacks and whites: A four‐metropolis analysis

Abstract

Three hypotheses seek to explain the persistence of residential segregation between blacks and whites in the United States: economic differentials, discrimination in housing and lending markets, and neighborhood preferences. The preferences hypothesis posits that both races wish to live in racially homogeneous neighborhoods. This article examines the preferences hypothesis by using recent interview data from metropolitan Atlanta, Boston, Detroit, and Los Angeles.

Race continues to be significant in the residential decision‐making process. Whites’ willingness to move into a neighborhood is inversely related to the density of blacks living there. Blacks prefer integrated neighborhoods, but ones with a substantial representation of blacks. Preferences differ significantly from one metropolis to another, with Detroit representing the extreme. In the other three metropolises, the preferences of blacks and whites do overlap sufficiently to offer hope for a decline in segregation, provided that the influence of other forces, particularly discrimination, also declines.     

Use of Internet Sources in International Studies Teaching and Research

This bibliographic review discusses and evaluates cost-free, reliable, quality online content useful to academics in international studies teaching and research at the college level, including how and where to locate such materials through guides, directories, gateway sites, repositories, and various types of search engines; considerations about Internet use in college classes; and undergraduate assignments that use sources of information from the Internet. There is also consideration of characteristics and trends of college student use of the Internet for research purposes, the "invisible" or deep web, electronic information literacy for academics, and maintaining current awareness on the fast-changing web.     

When farmworkers and advocates see trafficking but law enforcement does not: challenges in identifying labor trafficking in North Carolina

This article reports on the perceptions and experiences with labor trafficking of farmworkers, stakeholders, and law enforcement representatives in North Carolina. We found a sizeable number of farmworkers who had experienced labor trafficking violations, albeit with a convenience sample; and community agencies reported stories of labor trafficking victimization. However, most of the state and local law enforcement agencies that we attempted to contact simply ignored our requests for information about labor trafficking or reported no evidence of such victimization. Notwithstanding the sample limitations, we found a general lack of awareness of agricultural labor trafficking problems among law enforcement officials in our surveyed jurisdictions. We question whether our current law enforcement system will ever be in a position to effectively enforce the anti-labor-trafficking law; and suggest an alternative specialized mechanism be established.