7 research outputs found
Urgent need for improved protection of the Coral Sea
[Extract] Australia's leading tropical marine scientists strongly support the proposal to transform the Coral Sea into the world’s largest no-take area, to protect its immense environmental and heritage values from the escalating threats of overfishing and climate change
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Dissolution behaviour of biosoluble HT stone wool fibres
The dissolution behaviour of two types of fibres, the biosoluble HT and the traditional MMVF21 stone wool fibres, in synthetic simulated lung fluid (Gamble's solution) at pH 4.5 was investigated in order to clarify the mechanisms, and the effect of the various constituents in the liquid.
The Gamble's solution contains various organic acids and salts. The study showed that organic acids which are able to form complexes with aluminium (e.g. citric and tartaric acid) caused both fibres to dissolve at a high rate at pH 4.5. Organic acids without the ability to form complexes with aluminium (e.g. acetic, maleic, lactic and pyruvatic acid) have no (or minor) impact on the dissolution rate at pH 4.5.
The presence of sodium chloride lowers the dissolution rate, especially that of MMVF21. The silica that remains when the silica network has been depleted of aluminium ions (due to citric and tartaric acid) behaves differently in the two fibres. In HT fibres the silica dissolves at a high rate, probably as a diluted sol. Thus the HT fibre has a high dissolution rate in Gamble's solution at pH 4.5. For the MMVF21 fibre, condensation of the silica network as a gel results in a lower dissolution rate. It is assumed that the different Al/(Al+Si) ratios for HT and MMVF21 fibres explain why the fibres behave differently
Governing terrorism through risk: Taking precautions, (un)knowing the future
The events of 9/11 appeared to make good on Ulrich Beck's claim that we are now living in a (global) risk society. Examining what it means to ‘govern through risk’, this article departs from Beck's thesis of risk society and its appropriation in security studies. Arguing that the risk society thesis problematically views risk within a macro-sociological narrative of modernity, this article shows, based on a Foucauldian account of governmentality, that governing terrorism through risk involves a permanent adjustment of traditional forms of risk management in light of the double infinity of catastrophic consequences and the incalculability of the risk of terrorism. Deploying the Foucauldian notion of ‘dispositif’, this article explores precautionary risk and risk analysis as conceptual tools that can shed light on the heterogeneous practices that are defined as the ‘war on terror’