Identification and age estimation of blood stains on colored backgrounds by near infrared spectroscopy

Non-destructive identification and subsequent age estimation of blood stains are significant steps in forensic casework. The latter can provide important information on the temporal aspects of a crime. As previously shown, visible spectroscopy of blood stains on white backgrounds can successfully be used for their identification and age estimation. The use of this technique however, is hampered by dark backgrounds. In the present study the feasibility to use near infrared (NIR) spectroscopy was evaluated for blood stain identification and age estimation on dark backgrounds. Using NIR reflectance spectroscopy, blood stains were distinguished from other substances with 100% sensitivity and 100% specificity. In addition, Partial Least Squares Regression analysis was applied to estimate the age of blood stains on colored backgrounds. The age of blood stains up to 1 month old was estimated successfully with a root mean squared error of prediction of 8.9%. These findings are an important step toward the practical implementation of blood stain identification and age estimation in forensic casework, where a large variety of backgrounds can be encountered.     

Dissenting and Concurring Opinions in International Investment Arbitration: How the Arbitrators Frame Their Need to Differ

Though still relatively infrequent, the issuing of dissenting and concurring opinions is becoming more common in international investment arbitration. This paper reviews the reasons for delivering separate opinions envisaged in the bibliography on investment arbitration, comparing these with practices in the related area of commercial arbitration. Fourteen recent separate opinions appended to ICSID arbitration awards and decisions are then analysed to determine how the arbitrators themselves explain why they have taken the drastic step of issuing a separate opinion. Potential areas of convergence between investment arbitration and commercial arbitration practice will be addressed.     

Partisanship and Political Sophistication During and Outside of Election Times: A Longitudinal Analysis Using the German SOEP Survey 1984–2012

In many established democracies, partisan attachments play a central role in guiding citizens’ attitudes as well as their political behaviour. Most importantly, partisanship has an effect on what party citizens vote for on Election Day. In general, highly politically sophisticated citizens are more likely to identify with a party compared to the less politically sophisticated. This article argues that the strength of an individual’s partisan attachment varies considerably over time. More specifically, it finds that party attachments are stronger when Election Day is close. The less politically sophisticated in particular benefit from such an effect and develop stronger attachments at election times.     

Elemental Characterization and Discrimination of Nontoxic Ammunition Using Scanning Electron Microscopy with Energy Dispersive X‐Ray Analysis and Principal Components Analysis

Concerns over the toxic by‐products produced by traditional ammunition have led to an increase in popularity of nontoxic ammunition. In this work, the chemical composition of six brands of nontoxic ammunition was investigated and compared to that of a road flare, which served as an environmental source with similar composition. Five rounds of each brand were fired while a further five were disassembled and the primer alone was fired. Particles collected from all samples, including the road flare, were analyzed by scanning electron microscopy with energy dispersive X‐ray analysis. Common elements among the different ammunition brands included aluminum, potassium, silicon, calcium, and strontium. Spectra were then subjected to principal components analysis in which association of the primer to the intact ammunition sample was generally possible, with distinction among brands and from the road flare sample. Further, PCA loadings plots indicated the elements responsible for the association and discrimination observed.     

A Preliminary Investigation into the Accuracy of 3D Modeling and 3D Printing in Forensic Anthropology Evidence Reconstruction,

There is currently no published empirical evidence‐base demonstrating 3D printing to be an accurate and reliable tool in forensic anthropology, despite 3D printed replicas being exhibited as demonstrative evidence in court. In this study, human bones (n = 3) scanned using computed tomography were reconstructed as virtual 3D models (n = 6), and 3D printed using six commercially available printers, with osteometric data recorded at each stage. Virtual models and 3D prints were on average accurate to the source bones, with mean differences from ?0.4 to 1.2 mm (?0.4% to 12.0%). Interobserver differences ranged from ?5.1 to 0.7 mm (?5.3% to 0.7%). Reconstruction and modeling parameters influenced accuracy, and prints produced using selective laser sintering (SLS) were most consistently accurate. This preliminary investigation into virtual modeling and 3D printer capability provides a novel insight into the accuracy of 3D printing osteological samples and begins to establish an evidence‐base for validating 3D printed bones as demonstrative evidence.