Staying Alive: 1970s Southern Cone Exiles in the UK

This article seeks to contribute to the study of the 1970s dictatorships in Argentina, Chile and Uruguay by looking at one specific aspect of those regimes: exile. It considers exile in the UK, a host country on which research is limited, and claims that the fundamental political ideas that had inspired these exiles did not vanish but were variously reshaped, depending on changing political circumstances, how the exiles interacted with local forms of solidarity, and how they lived through the personal challenges that they experienced during exile.     

Accuracy and reliability of cone beam computed tomography of the jaws for comparative forensic identification: a preliminary study

Conventional computed tomography is an emerging modality in forensic identification but is not sufficiently accurate for use in dental identification primarily because of problems with metallic dental restoration-induced streak artifact. In this study, the accuracy and reliability of recording forensic information from cone beam computed tomography (CBCT) scans of the jaws when compared to conventional panoramic radiographs has been analyzed under experimental conditions. Information could be recorded with near-perfect repeatability and reproducibility. Information could also be recorded accurately, the sensitivity being 96.6% (95% CI, 95.1-98.1) and specificity being 98.4% (95% CI, 96.2-100). The metal dental restoration-induced streak artifact was at a level that permitted, in most cases, accurate observations. This is considered an important step in validating CBCT as a tool in comparative dental identification of bodies. It may have a role in mass fatalities and in chemical, biological, radiological, and nuclear incidents, but further studies are required to assess the feasibility of this.     

Identification from Chest X‐Rays: Reliability of Bone Density Patterns of the Humerus*

Abstract: A critical review of Kahana and Hiss’ study on identification from bone trabecular pattern and a test of their method conducted on the humerus are presented. Bone trabecular pattern was studied through the generation of a numerical file representing the gray scale. Using the correlation coefficient, several pairwise comparisons between numerical files were performed. The test gave nearly 30% of incorrect exclusions (the method did not recognize couples of radiographs belonging to the same subject) and 50% of misidentifications (the method recognized couples of radiographs belonging to different subjects, as belonging to the same subject); therefore, this research shows that at the present time, it is not possible to safely quantify identification through bone density patterns, of the proximal humerus taken from thoracic X‐rays. Thus, an “easy”—but dangerous—use of trabecular density patterns on this specific type of radiogram as an identification method should be currently avoided.     

Personal identification by the comparison of facial profiles: testing the reliability of a high-resolution 3D-2D comparison model

Identification from video surveillance systems is frequently requested in forensic practice. The "3D-2D" comparison has proven to be reliable in assessing identification but still requires standardization; this study concerns the validation of the 3D-2D profile comparison. The 3D models of the faces of five individuals were compared with photographs from the same subjects as well as from another 45 individuals. The difference in area and distance between maxima (glabella, tip of nose, fore point of upper and lower lips, pogonion) and minima points (selion, subnasale, stomion, suprapogonion) were measured. The highest difference in area between the 3D model and the 2D image was between 43 and 133 mm(2) in the five matches, always greater than 157 mm(2) in mismatches; the mean distance between the points was greater than 1.96 mm in mismatches, <1.9 mm in five matches (p < 0.05). These results indicate that this difference in areas may point toward a manner of distinguishing "correct" from "incorrect" matches.     

Cultivating Adolescents’ Academic Identity: Ascertaining the Mediating Effects of Motivational Beliefs Between Classroom Practices and Mathematics Identity

Teaching mathematics involves helping students develop mathematical skills and empowering students to see themselves as capable of participating in and being knowers and doers of mathematics. Extant research has postulated that mathematics identity is a critical contributor to adolescents’ mathematics achievement and subsequent academic success. Guided by motivation and instructional quality theories, this classroom-based study examined a mediating mechanism through which teacher practices associated with mathematics identity through motivational beliefs (i.e., expectancies, task values, and cost value). Participants included 525 sixth-grade students (48.6% male; 64% European American, 34% African American, 2% other race; 58.6% free-or-reduced lunch) in the United States. The findings suggest that competence beliefs and task values, except for cost value, mediated the association between teacher practices and mathematics identity. These mediation pathways also differed by race. The mediating role of mathematics expectancies was stronger for European American adolescents, while the mediating role of mathematics task values was stronger for African American adolescents, though effect sizes were relatively modest. Teachers seeking to develop students’ mathematics identity—especially in their minority or stereotyped students—might consider enhancing their sensitivity to students’ psychological needs, quality of feedback, and instructional learning supports in their daily interaction with students.

     

Diversification Under Climate Variability as Part of a CSA Strategy in Rural Zambia

Climate change is posing an increasingly severe challenge to agricultural livelihoods due to increased frequency and intensity of extreme weather events. Livelihood diversification can play an important role in decreasing food insecurity and vulnerability under these challenges. This paper contributes to the literature on livelihood diversification and vulnerability under climate change to assess the role of diversification as part of a Climate-Smart Agriculture strategy by analysing the determinants of diversification, income and poverty in Zambia using panel data. We specifically focus on the roles of climate shocks and institutions in shaping these linkages to highlight policy insights to improve resilience.     

Contrast Enhancement of Bite Mark Images Using the Grayscale Mixer in ACR in Photoshop®

Enhanced images may improve bite mark edge definition, assisting forensic analysis. Current contrast enhancement involves color extraction, viewing layered images by channel. A novel technique, producing a single enhanced image using the grayscale mix panel within Adobe Camera Raw^®, has been developed and assessed here, allowing adjustments of multiple color channels simultaneously. Stage 1 measured RGB values in 72 versions of a color chart image; eight sliders in Photoshop^® were adjusted at 25% intervals, all corresponding colors affected. Stage 2 used a bite mark image, and found only red, orange, and yellow sliders had discernable effects. Stage 3 assessed modality preference between color, grayscale, and enhanced images; on average, the 22 survey participants chose the enhanced image as better defined for nine out of 10 bite marks. The study has shown potential benefits for this new technique. However, further research is needed before use in the analysis of bite marks.