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.     

The Political Consequences of the Crash

The financial crash of 2008 precipitated a major recession. It shattered the financial growth model that had dominated the previous twenty years and plunged the international economy into a period of economic and political restructuring of uncertain duration. The immediate origins of the crash lay in the lending practices associated with the sub-prime mortgages in the United States which produced the credit crunch in 2007, but the wider causes were the unbalanced character of growth in the international economy and the particular role played by finance. The crisis has been explained in a number of different ways, focusing on the behaviour of the financial markets, the institutional and policy conditions that made the boom possible and then undermined it, longer-term economic and policy cycles and the nature of uncertainty and risk in complex social systems. The political impact of the crash and the recession has not been uniform; it has been highly uneven, depending on the position of particular states in the international economy. The rapid interventions by governments to stave off financial collapse at the end of 2008 were successful, but at the cost of creating serious problems of adjustment for the future. The political debate around what were the causes, who should be blamed and what should be done is only just beginning, and the way this crisis comes to be understood will play a major part in determining how it is eventually resolved and how far-reaching will be the changes to the international economy and to domestic politics.     

The Gradual Defederalization of Canadian Health Policy

Health policy is an important facet of territorial politics,drawing the contours of the sharing community. Changes in themanagement of the division of powers in health policy pointto shifting understandings of the federal political community.This article adopts this approach in the Canadian case, whereobservers disagree about whether values of federal diversityremain robust or are eroding. It considers three Commissions(Rowell-Sirois, Hall, and Romanow) reporting over a 60-yeartime span. The Commissions adopt different understandings ofthe division of powers and of the proper forms of intergovernmentalhealth governance, moving from a robust understanding of federaldiversity and the division of powers in the 1940s, to an afederalemphasis on efficiency and pan-Canadian citizenship in the early2000s.     

The Democratic Legitimacy of Bias Crime Laws: Public Reason and the Political Process

Law and Philosophy -