Glutaraldehyde and bromogeramine were studied by separately testing the algaecide number reduction percentage acting alone and in combination in different concentrations, using the synergism index to analyze and judge if there is synergism and to find out the ideal composition ratio.

By using of the Lyapunov stability theorem,a novel delay-independent and decentralized linear-feedback control law is designed to achieve the exponential synchronization.

For a class of delayed Chen chaotic systems with unknown parameters,the scheme of its exponential synchronization is discussed.

Based on the obtained result,the robust exponential synchronization for Lur\'e master and slave system with norm-bounded uncertainties was then presented.