Characterization and differentiation of aluminum powders used in improvised explosive devices – Part 1: Proof of concept of the utility of particle micromorphometry

Aluminum (Al) powders are commonly used in improvised explosive devices as metallic fuels, a component of explosive mixtures. These powders can be obtained readily from industrial‐scale and consumer products, and produced using unsophisticated “kitchen chemistry” techniques. This research demonstrates the potential of automated particle micromorphometry for comparisons between known source and questioned Al powders recovered from IEDs, as well as for insight into the method of Al powder manufacture. Al powder samples were obtained from legitimate manufacturers, and 56 samples were produced “in‐house” from Al‐containing spray paints and ball‐milled Al foils. Transmitted light microscope images of Al powder particles were acquired using an automated stage with automated z‐focus; 17 size and shape parameters were measured for all particles. Approximately 37,000–2,500,000 particles/sample were analyzed using an open‐source statistical package with customized code. Dimensionality reduction was required for processing the large datasets: eight of the 17 measured variables were selected based on inspection of the correlation matrix. Data from four subsamples from each of the 56 samples produced using “in‐house” methods were analyzed using ANOVA to assess the within‐ and between‐sample variation. High within‐sample variation was noted; however, ANOVA and post‐hoc Tukey's honestly significant difference (HSD) tests demonstrated that the between‐sample variation was substantially larger than the within‐sample variation. Each sample could be differentiated from all other samples in the test set. Future experiments will focus on ways to reduce the within‐sample variation, and additional statistical and microanalytical methods to classify sources and confidently constrain the method of Al powder manufacture.     

DIRE ET SE DIRE AU FÉMININ

The decree of 21st of June 1993 sets out how to express the female gender in profession names and function titles in official and administrative publications of the Communauté française de Belgique. It has helped to change mindsets. The guide Mettre au féminin (“Express the female gender”) allows civil servants to fulfil the requirements of the decree and helps promote the usage of the female gender in the French language. First published in 1994, it has been reviewed and re-edited in 2005. Even if the visibility of women in language usage is on the increase, it faces not so much linguistic but ideological obstacles. Le décret du 21 juin 1993 installe la féminisation des noms de métier et des titres de fonction dans les textes officiels et administratifs de la Communauté française de Belgique. Il aide les mentalités à progresser. Le guide Mettre au féminin permet aux fonctionnaires de respecter le décret et sert à promouvoir l’emploi du féminin dans l’usage de la langue française. Paru en 1994, il est mis à jour en 2005. Même si la visibilité des femmes dans l’emploi de la langue augmente, elle rencontre des obstacles non pas linguistiques mais idéologiques.     

Fatal non-accidental pediatric cranial fracture risk and three-layered cranial architecture development

This study examines the influence of three-layered cranial architecture development upon blunt force trauma (BFT) cranial outcomes associated with pediatric non-accidental injury (NAI). Macroscopic and microscopic metric and morphological comparisons of subadult crania ranging from perinatal to 17 years of age chronicle the ontogenetic development and spatial and temporal variability in the emergence of a mature cranial architecture. Cranial vault thickness increases with subadult age, accelerating in the first 2 years of life due to rapid brain growth during this period. Three-layer differentiation of the cranial tables and diploë initiates by 3–6 months but is not consistently observed until 18 months to 2 years; diploë formation is not well developed until after age 4 and does not manifest a mature appearance until after age 8. These results allow topographic documentation of cortical and diploic development and temporal and spatial variability across the growing cranium. The lateral cranial vault is identified as expressing delayed development and reduced expression of the three-layer architecture, a pattern that continues into adulthood. Comparison of fracture locations from known BFT pediatric cases with identified cranial fracture high-risk impact regions shows a concordance and suggests the presence of a higher fracture risk associated with non-accidental BFT in the lateral vault region in subadults below the age of 2. The absence or lesser development of a three-layered architecture in subadults leaves their cranial bones, particularly in the lateral vault, thin and vulnerable to the effects of BFT.     

Colonization of diatoms in and on porcine bone substrate and considerations of diatom ecology for forensic science

The presence of diatom algae in bone marrow has been used as forensic evidence of drowning for several decades; however, these studies are based on known or suspected recent drowning events. This study addresses the potential for diatoms to enter the bone marrow of skeletal remains, that is, de-fleshed long bones post-mortem. In laboratory and field experiments, bones were either inflicted with two access points by a cut and acid pitting or left intact. The bones were submerged in water for at least 1 week and up to 3 months. Samples of the bone surface and marrow were inspected for diatoms. The analysis considered the time required for diatoms to enter marrow and whether genus characteristics like size or mobility affect entry. The presence of an access point influenced diatom entry in that bones without an introduced access point had zero to one diatom present in the marrow, whereas a bone with an access point had >150 diatoms present in the marrow. The results of both laboratory and field phases suggest that diatoms will reliably colonize bone in as quickly as 1 week, establishing and maintaining communities for at least 3 months. However, the bone surface assemblages differ from the source community. Bone marrow displayed even more restrictive access to diatom colonization, resulting in communities dominated by small raphid diatoms. Based on these findings, we suggest some caveats on the use of diatoms as trace evidence in forensic science with recommendations for future avenues of research.     

International Organisations and States Within an Agency Relationship: The Distribution of Responsibility

Netherlands International Law Review - This article first examines the entire range of agency relationships between an international organisation, acting as a principal, and one or more states,...     

Uniform Rules for Contract Disputes: Putting Activity-Related Jurisdiction on the Agenda

Netherlands International Law Review - This article addresses the need for uniform jurisdiction rules in cross-border contractual disputes and attempts to put it back on the diplomatic agenda. It...     

Security Identities and ‘No More,No Less’ Operations: On Making NATO's Involvement in Darfur Possible

This article explores NATO's support mission to the African Union's peacekeeping operation in Darfur, Sudan between 2005 and 2007. NATO policies are commonly presented as functional responses to events, but how did a conflict on the African continent become the Atlantic Alliance's business? In this essay, a poststructuralist practice-oriented approach is used to understand the way in which discursive practices progressively establish a policy option as ‘natural' in a given situation. It is argued that the normalization of NATO's support mission to the African Union in Darfur and the integration of this operation in NATO's security identity were the result of complex and conflict-ridden social interactions between different discursive practices supported by different actors.