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Intuitively, the peers who share common interests tend to have a high probability of connecting to each other and sharing the resources. In this paper, we use the probabilistic decision tree to represent user's interests. Based on the interest probabilistic decision tree, we use an interest group model to organize the peers with common interests into one group. When using our algorithm, a significant...
A method of pressure leaching nickel and cobalt from sulphidic precipitates is provided, wherein such precipitates are leached with chlorine at a controlled redox potential of between 400 and 550 mV (Ag/AgCl), catalysed by copper, and at a temperature of between 120° and 160°C, to dissolve at least 80% of cobalt and to oxidize less than 10% of sulphur to sulphate.
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