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Keywords: H 1 filter design Discrete-time switched system Interval time-varying delay LMI optimization approach a b s t r a c t In this paper, the robust H 1 filter scheme for the discrete-time switched systems with interval time-varying delay and linear fractional perturbations is proposed. A convex optimization problem with some LMI constraints is(More)
Cu₂ZnSnS₄ (CZTS) thin films were deposited on glass substrates by using spin-coating and an annealing process, which can improve the crystallinity and morphology of the thin films. The grain size, optical gap, and atomic contents of copper (Cu), zinc (Zn), tin (Sn), and sulfur (S) in a CZTS thin film absorber relate to the concentrations of aqueous(More)
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