The Analysis of Black Powder Substitutes Containing Ascorbic Acid by Ion Chromatography/Mass Spectrometry*†

Abstract: Black powder substitutes containing ascorbic acid are a group of low explosives that utilize ascorbic acid as the fuel. The analysis of these powders is complicated by the degradation of ascorbic acid which occurs rapidly in solution and may also occur as the powder ages. Aqueous extracts of both intact powders and postblast residues were analyzed by an existing ion chromatography/mass spectrometry (IC/MS) method used at the Bureau of Alcohol, Tobacco, Firearms and Explosives. Results have shown that while ascorbic acid itself is not detected in this method, its diagnostic degradation products (threonic acid, monohydrated diketogulonic acid, and oxalic acid) can be identified. In addition, anions from the inorganic oxidizers (perchlorate and nitrate) and combustion products such as chloride, chlorate, and nitrite, can be identified within the same experiment. While this IC/MS method shows promise, future modifications are necessary because of limitations in identifying threonate in postblast residues, as well as coeluting compounds observed in postblast residues.     

Teaching Young Children to Discriminate Abusive From Nonabusive Situations Using Multiple Exemplars in a Modified Discrete Trial Teaching Format

Personal safety programs can teach young children knowledge and skills they can utilize to avoid or escape abduction and sexual abuse (Wurtele, 1990). An appropriate escape response will not occur, however, if the child is unable to discriminate an innocuous situation from a potentially abusive one. This study examines the crucial elements involved in training the recognition or discrimination phase in personal safety programs. A multiple probe design across three typically developing children, ages 5-years 7-months through 6-years 7-months, was used to determine whether rules and discrete trial training of discriminations of appropriate and inappropriate touch and situations generalized to puppet role-play scenarios. All participants showed increases in correct responding on generalization role-play probes and maintained these increases over a 3-and 6-week follow-up.     

Explaining Strategic Violence after Wars

This article aims to explain why strategic violence against targeted groups emerges after some civil wars but not others. It argues that when one side has captured the coercive apparatus of the state, and the potentially hostile losing side is less vulnerable to predation, the leaders of the victorious group can reward their domestic constituents and conduct in-group policing to prevent opportunistic violence. But when an armed group fails to achieve state capture and the losing side remains in a vulnerable position relative to its former enemies, neither side can credibly guarantee their domestic allies a share of the resources of the state or conduct effective in-group policing of potential extremists. Using Kosovo and East Timor as case studies, this article shows that in these cases, strategic violence is less a function of a concerted attempt to spoil a settlement than of the internal bargaining of new splinter groups.     

Sub-Saharan African randomised clinical trials into male circumcision and HIV transmission: methodological, ethical and legal concerns

In 2007, WHO/UNAIDS recommended male circumcision as an HIV-preventive measure based on three sub-Saharan African randomised clinical trials (RCTs) into female-to-male sexual transmission. A related RCT investigated male-to-female transmission. However, the trials were compromised by inadequate equipoise; selection bias; inadequate blinding; problematic randomisation; trials stopped early with exaggerated treatment effects; and not investigating non-sexual transmission. Several questions remain unanswered. Why were the trials carried out in countries where more intact men were HIV-positive than in those where more circumcised men were HIV-positive? Why were men sampled from specific ethnic subgroups? Why were so many participants lost to follow-up? Why did men in the male circumcision groups receive additional counselling on safe sex practices? While the absolute reduction in HIV transmission associated with male circumcision across the three female-to-male trials was only about 1.3%, relative reduction was reported as 60%, but, after correction for lead-time bias, averaged 49%. In the Kenyan trial, male circumcision appears to have been associated with four new incident infections. In the Ugandan male-to-female trial, there appears to have been a 61% relative increase in HIV infection among female partners of HIV-positive circumcised men. Since male circumcision diverts resources from known preventive measures and increases risk-taking behaviours, any long-term benefit in reducing HIV transmission remains uncertain.