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The exchange of acidic groups in a brown coal with barium promotes oxidation during air-drying of the exchanged coal. The oxidation results in the formation of carboxyl groups and carbon dioxide. If the Ray Ban AAA Sunglasses Black Chocolate Rayban-0479 exchange involves phenolic groups the carbon dioxide generated during oxidation is retained in the coal as carbonate, and the carboxyl groups are formed as carboxylates at the expense of the phenolic groups. Decarboxylation of these carboxyl groups is considered to produce the carbon dioxide evolved when the exchanged coal is refluxed with water or acid. In the determination of acidic groups, provided oxidation is kept to a minimum during exchange, the interference due to any barium carbonate formed is small and may be ignored. This paper addresses Online Ray Ban Round Black Rayban-3872 the Archimedes Wave Swing (an offshore wave energy converter, which produces electricity from sea waves). It compares the performances of latching control (a discrete, highly non-linear, intrinsically sub-optimum control strategy), of reactive control, of phase and amplitude control (two optimum control strategies that involve non-causal transfer functions, which have to be implemented with approximations, thus rending the control sub-optimum), and of feedback linearisation control (a non-linear control strategy). From extensive simulations it is concluded that the latter performs clearly better irrespective of the sea state, and leads to a significant increase of absorbed wave power.