Voltammetric analysis of luminescent markers in gunshot residues

Currently, SEM-EDS is used to detect gunshot residue (GSR) from the presence of Ba, Pb, and Sb in the sample. However, the development of new nontoxic ammunition (NTA) has prevented conventional metals from being found. In this work, we aim to determine the presence of an inorganic luminescent chemical marker based on rare earth in gunshot residues using the technique of squarewave voltammetry (SWV). After firing, the luminescent complex [(Eu₂Zr)(btc)₃(Hbtc)_0.5.6H₂O], which is used as a chemical marker, can be detected under a UV lamp. An aqueous solution with 0.1 mol L⁻¹ KCl as supporting electrolyte can be easily collected on carbon paste electrode surfaces for SWV analysis A = 100 mV, f = 10 Hz, and step potential of 5 mV are required. The luminescent marker incorporated into the carbon paste electrode showed two anodic peak currents in the region of 0.4 V (vs Ag/AgCl) and at 0.75 V (vs Ag/AgCl) and also a cathodic one in 0.4 V (vs Ag/AgCl). SEM-EDS was able to analyze the same voltammetric results for conventional and nontoxic ammunition containing the luminescent marker. Therefore, voltammetry and SEM-EDS are valid for detecting the new residue marker in GSR. Despite this, the electrochemical method is still more advantageous because of its low cost and lack of expensive equipment and supplies in forensic laboratories.     

“Take My License n’ All That Jive,I Can’t See … 35”: Little Hope for the Future Encourages Offending Over time

A very small number of studies has observed that persons who perceive an early age-at-death report a higher risk of offending. This literature, however, is limited by the use of general population samples, cross-sectional data, and the failure to consider both the determinants of perceived age-at-death, as well as some of the mediating processes associated with the relationship between perceived age-at-death and offending. Using data for a large sample of serious youthful offenders from two urban cities and who were followed for seven years, the current study attends to these concerns. Results show that gender, race/ethnicity, and adverse neighborhood conditions influence the perceived age-at-death; this perception distinguishes between distinct trajectories of offending, and such perceptions also influence both perceived risks and perceived rewards as well as one’s impulse control.     

Housing Affordability and Health: Evidence From New York City

It is generally understood that households make tradeoffs between housing costs and other living expenses. In this article, we examine the relationship between health-related outcomes and housing-induced financial burdens for renters in one of the most expensive cities in the world, New York, New York. Drawing from the Housing Vacancy Survey for 2011, a representative survey conducted by the U.S. Census Bureau of more than 16,000 households in New York City, we estimate the effect of housing cost burden on the overall health of renters and the extent to which they have postponed various types of medical services for financial reasons. Results show that higher out-of-pocket rent burdens are associated with worse self-reported health conditions and a higher likelihood to postpone medical services for financial reasons. This relationship is particularly strong for those households with severe rent burdens. In addition, housing cost burden is equally or more important than other physical housing characteristics in explaining the variation in self-reported general health status and health care postponement. These findings are robust across specifications with different degrees of household, unit/building, and neighborhood controls, and among longstanding and newer renters. Our findings point to the importance of considering health-related outcomes when designing housing policies, and that housing subsidies should target both renters' out-of-pocket costs and place-based repair and maintenance.     

Phenotypic Preference in Mexican Migrants: Evidence from a Random Household Survey

Political Behavior - Does pre-existing preference based on skin tone, facial features, and other observable characteristics, i.e., phenotypic preference, affect immigrant voters’ support for...     

Big Data and Dahl’s Challenge of Democratic Governance

Big data applications have been acclaimed as potentially transformative for the public sector. But, despite this acclaim, most theory of big data is narrowly focused around technocratic goals. The conceptual frameworks that situate big data within democratic governance systems recognizing the role of citizens are still missing. This paper explores the democratic governance impacts of big data in three policy areas using Robert Dahl’s dimensions of control and autonomy. Key impacts and potential tensions are highlighted. There is evidence of impacts on both dimensions, but the dimensions conflict as well as align in notable ways and focused policy efforts will be needed to find a balance.     

Promoting Postsecondary Education in Low-Income Youth: The Moderating Role of Socio-Behavioral and Academic Skills in the Context of a Major Educational Reform

Journal of Youth and Adolescence - Governments around the world are pressed to invest in postsecondary education. However, little research exists to document whether large-scale educational reforms...     

Legal, Individual, and Environmental Predictors of Court Disposition in a Sample of Serious Adolescent Offenders

Historically, the juvenile court has been expected to consider each youth's distinct rehabilitative needs in the dispositional decision-making process, rather than focusing on legal factors alone. This study examines the extent to which demographic, psychological, contextual, and legal factors, independently predict dispositional outcomes (i.e., probation vs. confinement) within two juvenile court jurisdictions (Philadelphia, Phoenix). The sample consists of 1,355 14- to 18-year-old male and female juvenile offenders adjudicated of a serious criminal offense. Results suggest that legal factors have the strongest influence on disposition in both jurisdictions. For example, a higher number of prior court referrals is associated with an increased likelihood of secure confinement in both jurisdictions. Juveniles adjudicated of violent offenses are more likely to receive secure confinement in Phoenix, but are more likely to be placed on probation in Philadelphia. Race is unrelated to dispositional outcome, but, males are consistently more likely than females to be placed in secure confinement. Importantly, individual factors (e.g., developmental maturity) generally were not powerful independent predictors of disposition. Finally, an examination of the predictors of juvenile versus adult court transfer in Phoenix indicated that males, older juveniles, and those with a violent adjudicated charge were more likely to be transferred to adult court, while juveniles scoring high on responsibility as well as those juveniles with an alcohol dependence diagnosis were more likely to be retained in juvenile court.