Pitfalls of Computed Tomography 3D Reconstruction Models in Cranial Nonmetric Analysis*

Many studies in the literature have highlighted the utility of virtual 3D databanks as a substitute for real skeletal collections and the important application of radiological records in personal identification. However, none have investigated the accuracy of virtual material compared to skeletal remains in nonmetric variant analysis using 3D models. The present study investigates the accuracy of 20 computed tomography (CT) 3D reconstruction models compared to the real crania, focusing on the quality of the reproduction of the real crania and the possibility to detect 29 dental/cranial morphological variations in 3D images. An interobserver analysis was performed to evaluate trait identification, number, position, and shape. Results demonstrate a false bone loss in 3D models in some cranial regions, specifically the maxillary and occipital bones in 85% and 20% of the samples. Additional analyses revealed several difficulties in the detection of cranial nonmetric traits in 3D models, resulting in incorrect identification in circa 70% of the traits. In particular, pitfalls included the detection of erroneous position, error in presence/absence rates, in number, and in shape. The lowest percentages of correct evaluations were found in traits localized in the lateral side of the cranium and for the infraorbital suture, mastoid foramen, and crenulation. The present study highlights important pitfalls in CT scan when compared with the real crania for nonmetric analysis. This may have crucial consequences in cases where 3D databanks are used as a source of reference population data for nonmetric traits and pathologies and during bone-CT comparisons for identification purposes.     

Gender differences in perpetuating factors,experience and management of chronic insomnia

The higher prevalence of insomnia in women has been attributed to biological factors, which are less likely than cognitive and behavioural factors to play a role in perpetuating insomnia. Gender differences in perpetuating factors have not been extensively examined. This study compared men’s and women’s self-reports of factors that perpetuate insomnia; experience of symptoms, perceived severity and impact on daytime functioning; and use of strategies to manage insomnia. Data were collected at baseline, using reliable and valid measures, in a project that evaluated behavioural therapies for insomnia. The sample (N = 739) consisted of women (62.4%) and men (37.6%). Gender differences were found in: (1) perpetuating factors: men took more naps and held more unhelpful beliefs about insomnia, whereas women experienced higher pre-sleep arousal; (2) perception of insomnia severity: higher among women; (3) perceived impact of insomnia: higher fatigue among women; and (4) use of strategies (higher in women) to manage insomnia. Gender differences were of a small size but could be associated with women’s stress, expression of somatic symptoms, and interest in maintaining their own health to meet multiple role demands.     

From environmental policy concepts to practicable tools: Knowledge creation and delegation in multilevel systems

The problem‐solving capacity and problem‐generating potential of multilevel systems entail the need for the delegation of authority. When the problem concerned is about how to put an abstract policy concept into a practicable policy tool, the choice of the respective delegation trajectory depends on the policy models or the policy‐relevant knowledge that the respective political levels can supply. When regarding the European Union (EU) level as the starting point of knowledge creation and delegation trajectories, and concentrating on transaction costs, policy knowledge and models generated at the international level provide the most cost‐effective solution. Only when the international level is not able to provide further policy knowledge and innovation does the EU delegate its definitional authority, first downward to the member states and then sideways to EU agencies. We illustrate the plausibility of our dynamic understanding of multilevel governance by using Environmental Policy Integration as an example.     

Signaling virtue: voluntary accountability programs among nonprofit organizations

This article examines the structure of nonprofit voluntary accountability and standard-setting programs, arguing that these programs can be understood as collective action institutions designed to address information asymmetries between nonprofits and their stakeholders. Club theory and the economics of certification suggest that such programs have the potential to provide a signal of quality by setting high standards and fees and rigorously verifying compliance. Such mechanisms can signal quality because higher participation costs may allow only high-quality organizations to join. The article examines the implications of signaling theory using an original dataset on the structure of 32 nonprofit accountability programs across the globe. While many programs set high standards for compliance, the key distinction between strong and weak programs is the use of disclosure or verification mechanisms to enforce compliance. Contrary to theoretical expectations, compliance standards and verification do not appear to be substitutes in creating stronger voluntary programs.

Co-Production and Health System Reform – From Re-Imagining To Re-Making

There is growing interest in the application of citizen participation within all areas of public sector service development, where it is increasingly promoted as a significant strand of post-neoliberal policy concerned with re-imagining citizenship and more participatory forms of citizen/consumer engagement. The application of such a perspective within health services, via co-production, has both beneficial, but also problematic implications for the organisation of such services, for professional practice and education. Given the disappointing results in increasing consumer involvement in health services via 'choice' and 'voice' participation strategies, the question of how the more challenging approach of co-production will fare needs to be addressed. The article discusses the possibilities and challenges of system-wide co-production for health. It identifies the discourse and practice contours of co-production, differentiating co-production from other health consumer-led approaches. Finally, it identifies issues critically related to the successful implementation of co-production where additional theorisation and research are required.     

The use of linear dichroism in forensic fibre examinations — Part 6. Validation and practical aspects of MSP-PPL

This paper summarizes the results of previous work on the microscopic observation of linear dichroism found in dyed fibres (polyesters, polyamides, wool, silk, cotton, viscose, acrylics and acetates) and in pigmented fibres as well as the measurements on these fibre classes using microspectrophotometry with plane polarized light (MSP-PPL). The validation of this method is discussed and a practical tool is proposed for comparing fibre traces with control fibres. The limitations and strengths of this method are also revised.