By Alain Prouté
Rappel sur les nombres réels, boules ouvertes, partie bornées, voisinages events ouvertes, issues adhérents, events fermées, events denses, suites, sous-suites, issues d'accumulation, limite, théorème de Bolzano-Weierstrass, suites de Cauchy, espaces complets, compacts, software maintains, uniformément maintains, lipschitziennes, théorème élémentaire de prolongement.
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Extra resources for Espaces Métriques
Waste is part of the pollution picture though, as waste materials move beyond the scope of everyday activity, it tends to be overlooked. The percentage by weight of environmentally hazardous materials in demolition waste is relatively small, but is still a large quantity and has a considerable negative effect on the environment. Whilst some materials can be burned in an ordinary incinerator, others need incinerators with highly efficient flue gas purifiers. Few incinerators can do this efficiently – many still emit damaging compounds such as SO2, hydrogen chloride (HCl), heavy metals and dioxins.
However, timber constructions can easily have a far longer lifetime – and this can be further increased through more re-use in up to several cycles for some components. There are other materials that can store carbon. Alkaline earth compounds such as magnesium oxide (MgO) and calcium oxide (CaO) are present in naturally occurring silicate rocks such as serpentine and olivine. When these react with CO2 they form stable carbonates that can be used both as building blocks and as aggregates in concrete.
Apart from competition with food supplies, it is normally to be regarded as climate neutral, assuming replantation. The renewable sources such as wind, wave and solar are generally unproblematic but none of them are without some environmental consequences. 1 Energy-related pollution in production processes based on direct use of fossil fuels and mixed domestic waste PART 1 (Source: Naturvardsverket, Stockholm 2007) Sources CO2 [g/MJ] SO2 [g/MJ] NOx [g/MJ] Oil 75 0,18 0,1 Natural gas 55 0 0,04 Coal 91 0,20 0,15 Coke 103 0,36 0,15 Mixed domestic waste 25 0,05 0,09 The figures do not include emissions from extraction and transportation of the fuels, where about 15% should be added.