Portable high‐resolution automated 3D imaging for footwear and tire impression capture

The forensic science community raised the need for improved evidence recognition, collection, and visualization analytical instrumentation for field and laboratory use. While the 3D optical techniques for imaging static objects have been extensively studied, there is still a major gap between current knowledge and collecting high‐quality footwear and tire impression evidence. Among optical means for 3D imaging, digital fringe projection (DFP) techniques reconstruct 3D shape from phase information, achieving camera‐pixel spatial resolution. This paper presents a high‐resolution 3D imaging technology using DFP techniques dedicated to footwear and tire impression capture. We developed fully automated software algorithms and a graphical user interface (GUI) that allow anyone without training to operate for high‐quality 3D data capture. We performed accuracy evaluations and comparisons comparing with the commercial high‐end 3D scanner and carried out qualitative tests for various impressions comparing with the current practices. Overall, our technology achieves similar levels of accuracy and resolution with a high‐end commercially available 3D scanner, while having the merits of being (1) more affordable; (2) much easier to operate; and (3) more robust. Compared with the current practice of casting, our technology demonstrates its superiority because it (1) is non‐destructive; (2) collects more evidence detail than casts, especially when an impression is fragile; (3) requires less time and money to collect each piece of evidence; and (4) results in a digital file that can easily be shared with other examiners.     

Doing Nothing is Sometimes Worse: Comparing Avoidant versus Approach Coping Strategies with Peer Victimization and Their Association to Depression and Suicide Ideation

ABSTRACT

Peer victimization is a major stressor adolescents often face in the school environment, and has been linked to depression and suicidal risk. This study analyzed the associations between three behavioral coping strategies (avoidance, seeking social support from adults/peers, and retaliation) and depression and suicidal ideation. Participants included 4,254 victimized students who were part of the Saving and Empowering Young Lives in Europe (SEYLE) study that compared three school-based prevention interventions and collected information on health risk behaviors in adolescents from 11 European countries. Results showed behavioral avoidance to be associated with an increase in levels of depression, as compared to the other coping strategies (adult social support, peer social support, retaliation). Seeking social support from adults was associated with lower depression and suicidal ideation rates. A more than 25% increase in suicidal ideation was associated with behavioral avoidance, compared to seeking social support from adults. By contrast, retaliation to peer victimization was not found to be associated with increased depression or suicidal ideation. The findings support the Coping Deficit model and may suggest that abstaining by doing nothing when victimized can be associated with certain adverse emotional outcomes.     

Estimating Individual Contributions to Complex DNA SNP Mixtures.,

High‐throughput sequencing (HTS) of large panels of single nucleotide polymorphisms (SNPs) provides an alternative or complimentary approach to short tandem repeats (STRs) panels for the analysis of complex DNA mixture forensic samples. For STRs, methods to estimate individual contribution concentrations compare capillary electrophoresis peak heights, peak areas, or HTS allele read counts within a mixture. This article introduces three approaches (mean, median, and slope methods) for estimating individual DNA contributions to forensic mixtures for HTS/massively parallel sequencing (MPS) SNP panels. For SNPs, the major:minor allele ratios or counts, unique to each contributor, were compared to estimate contributor proportion within the mixture using the mean, median, and slope intercept for these alleles. The estimates for these three methods were typically within 5% of planned experimental contributions for defined mixtures.     

The erosion of the administrative state under President Trump: Citizens' pushback against individual and institutional racism

President Trump encouraged bad state actors within the administrative state to contribute to inequities for civilians. We highlight how Trump's actions and rhetoric led to increased individual, institutional, and systemic racism and violence. As a response to this increased violence and rhetoric, we discuss the role civilians (including professional athletes) played in engaging in protests and the 2020 election. Given that more individuals voted in that election cycle, we emphasize the importance for public administration to adapt, evolve, and engage with new actors concerned with administrative action or inaction.     

Ministers,Markets and Missiles: The British Government,the European Economic Community and the Nuclear Non-Proliferation Treaty, 1964–68

Existing accounts of British efforts to achieve a nuclear non-proliferation treaty between 1964 and 1968 largely overlook the later stages of decision making within the Labour government. Scrutiny of previously classified sources reveals that a desire for entry into the European Economic Community had a much larger influence on the content and conduct of British non-proliferation policy than previously suggested. By 1967, Prime Minister Harold Wilson sought a secondary role in treaty negotiations, and left the running to the superpowers. This avoided unnecessary conflict with the countries of the Community, resentful of the Treaty's discriminatory terms, and helped to protect Britain's application to join the EEC. Although this bid was unsuccessful, ambitions for future membership continued to influence non-proliferation policy in 1968. Indeed, a desire for future entry into the EEC helps to explain why Britain became the first nuclear weapon state to ratify the Treaty.