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interesting problem is to determine whether all the squares of side n−1 can be packed into a rectangle of the appropriate area. Such a packing (into a rectangle of the right area) is called perfect. In this paper, we define an algorithm based
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algorithm by Paulhus and use it to show that there is a perfect packing of the squares of side n−3/5 into a square. The technique can be used to prove that there is a perfect packing of the squares of side n−t into a square, where 1/2<t⩽3/5, provided a certain algorithm succeeds for that value of t. It has succeeded for every such value of t that the author has tried. We also show that there is a perfect packing for all t in the range 0.5964⩽t⩽0.6.
The behaviour, in conditions of total immersion, of an acrylic water-based paint applied to a St 35.8 steel, has been studied using electrochemical techniques. The data obtained have enabled a three-step mechanism to be proposed. In the first step, there is an increase in the activity of the system, as a consequence of the entry of water. In the second step, once a critical level in the water content has been passed, the inhibitor pigments are activated, and this leads to a decrease in the electrochemical activity. Finally, once that the pigments have been exhausted, there is a loss of the protective properties of the paint, with the result that the activity detected is similar to that of the bare metal.