Fluorescent TiO2 powders prepared using a new perylene diimide dye: applications in latent fingermark detection

A new, highly fluorescent dye was synthesised using oleylamine combined with a perylene dianhydride compound. The new dye was characterised by 1H NMR, UV-vis spectroscopy and fluorescence spectroscopy as well as quantum yield. The dye was absorbed onto titanium dioxide nanoparticles for use as a fingerprint detection powder. The new fluorescent powder was applied to latent fingermarks deposited onto different non-porous surfaces and compared with commercial fluorescent powders. The powder exhibits strong fluorescence at 650-700 nm under excitation at 505 nm. On glass surfaces, the new powder gave images showing tertiary-level detail of the fingermark ridges with almost no background development. Compared with current magnetic fluorescent powders, the new powder was slightly weaker in fluorescence intensity but produced significantly less background development, resulting in good contrast between the fingermark and the substrate.     

Direct and Indirect Services for Children in Domestic Violence Shelters

The majority of women entering battered women’s shelters bring children with them and those children often require specialized programs that address the ways in which witnessing domestic violence has affected them. Several programs have been developed and implemented; however, few have been empirically evaluated. The current article critically examines several intervention strategies and their effectiveness. Barriers to service are also identified. Although there is a paucity of research in this area, the present review suggests that intervening with children may show promise for breaking the cycle of violence.     

Transformations in the age and gender of unfree workers on hybrid cotton seed farms in Andhra Pradesh

The article critically applies the theory of everyday forms of peasant resistance (EFPR) to an analysis of land struggles in the Ecuadorean Andes. It explores the effectiveness of ‘weapons of the weak'used by indigenous peasants in conflicts with the haciendas. The relationship between hidden resistance and the rise of political organisation is also examined. Special attention is paid to the structural context and cultural underpinning of both covert and overt peasant action.     

Dating human skeletal remains using a radiometric method: biogenic versus diagenetic 90Sr and 210Pb in vertebrae

In forensic science, there is a strong interest in determining the post-mortem interval (PMI) of human skeletal remains up to 50 years after death. Currently, there are no reliable methods to resolve PMI, the determination of which relies almost exclusively on the experience of the investigating expert. Here we measured (90)Sr and (210)Pb ((210)Po) incorporated into bones through a biogenic process as indicators of the time elapsed since death. We hypothesised that the activity of radionuclides incorporated into trabecular bone will more accurately match the activity in the environment and the food chain at the time of death than the activity in cortical bone because of a higher remodelling rate. We found that determining (90)Sr can yield reliable PMI estimates as long as a calibration curve exists for (90)Sr covering the studied area and the last 50 years. We also found that adding the activity of (210)Po, a proxy for naturally occurring (210)Pb incorporated through ingestion, to the (90)Sr dating increases the reliability of the PMI value. Our results also show that trabecular bone is subject to both (90)Sr and (210)Po diagenesis. Accordingly, we used a solubility profile method to determine the biogenic radionuclide only, and we are proposing a new method of bone decontamination to be used prior to (90)Sr and (210)Pb dating.     

Preliminary evaluation of the persistence of organic gunshot residue

The organic components of gunshot residue (OGSR, also called firearms discharge residue (FDR) or cartridge discharge residue (CDR)) have been studied and discussed in the literature. These residues, consisting of particulates such as burned and unburned powder as well as molecular compounds, are rarely used in casework except for purposes such as shooting reconstructions. Molecular compounds that survive the firing event or that are created as a result of the firing event could, with focused research and development, open a new avenue for forensic gunshot residue analysis. In this study, the persistence of organic gunshot residue was evaluated using diphenylamine (DPA) as a target analyte and ion mobility spectrometry (IMS) as the detection system. Samples were collected from hands using a solvent swabbing technique and the swab was analyzed using direct thermal desorption for sample introduction into the IMS. OGSR was found to persist for at least 4h. Although DPA is a widely used industrial compound, analysis of numerous blank and background samples (n～100) did not show any significant response for DPA using this detector. Variations were noted among individuals and as such, the data set does not support estimation of a half-life as has been done for traditional primer residues. No secondary transfers were observed, suggesting the possibility of skin adhesion via interactions between the lipophilic organic compounds and skin lipids. IMS proved valuable as a means of generating patterns for forensic pattern matching and shows promise as a screening tool applied to firearms discharge.     

Understanding and influencing the policy process

This essay translates some of the underlying logic of existing research of policy processes into a set of strategies for shaping policy agendas and influencing policy development and change. The argument builds from a synthesized model of the individual and a simplified depiction of the political system. Three overarching strategies are introduced that operate at the policy subsystem level: developing deep knowledge; building networks; and participating for extended periods of time. The essay then considers how a democratic ethic can inform these strategies. Ultimately, the success or failure of influencing the policy process is a matter of odds, but these odds could be changed favorably if individuals employ the three strategies consistently over time. The conclusion contextualizes the arguments and interprets the strategies offered as a meta-theoretical argument of political influence.