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phosphorus has been removed more from water in purification process can result
in higher grade of biological stability of the effluent tap water, especially
for the water plant when using surface water source. This study conducted the
experiments of phosphorus removal by three coagulants including aluminum
chloride, aluminum sulfate and poly aluminum chloride. The results indicated
that the poly aluminum chloride is the preferred one that could remove
phosphorus up to 80%, followed by aluminum chloride and aluminum sulfate. The
lowest proportion of aluminum quality to phosphorus quality is 63 as using poly
aluminum chloride, followed by aluminum chloride and aluminum sulfate. It is
suggested that the poly aluminum chloride should be the best option to remove
phosphorus in water plant.
In wireless sensor networks, due to the energy and resource constraints, nodes may be unwilling to forward packets for their neighbors. This can render severe deteriorations in the network performance and malfunctions of the system. To tackle such selfish behaviors and enhance the cooperation among sensors, based on reputation and energy consumption of each node, we present a utility function to punish the malicious nodes and encourage cooperation among nodes. Specifically, we firstly give a mixed strategy Nash equilibrium solution for the two nodes. Then we extend the model to multi-nodes scenario. With the unity function, each sensor’s reputation is evaluated according to its degree of cooperation. The extensive simulation results have shown the effectiveness of the mechanism, in that the cooperative behaviors are encouraged, which can ensure the normal functioning of the network system.