[Formula: see text] (SLTO) ceramics ([Formula: see text] = 0.05, 0.10, 0.15) were prepared with giant dielectric constant by the traditional solid-state method at 1350[Formula: see text]C. The temperature dependence of the dielectric constant was obtained at the temperature ranging from 29[Formula: see text]C to 500[Formula: see text]C and the frequency ranging from 2 kHz to 2 MHz. Two sets of relaxation peaks appear in the low temperature (region I) and the high temperature (region II), respectively. For region I, we conclude that the relaxation behavior is related to the oxygen vacancy migration. For region II, the two relaxation processes are caused by grain boundary for high frequency and Sr or Ti defects at grain interior for low frequency. With the doping amount reaching 0.15, the relaxation peaks disappear and become a common phase transition because of the aggravation of lattice distortion. These possible physical mechanisms of two sets of relaxation peaks are briefly discussed.

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Abstract. An inexact-based fuzzy multi-objective programming (IFMOP) model is developed based on analysis of fuzzy information and multi-objective characteristics of an ecological city. In the IFMOP model, parameters originally based on certain targets and accurate objectives are now obtained as interval numbers. Through the interactive process between decision makers and the interpretation of the model, some reasonable solutions can be achieved by using MATLAB programming. This study took a new development zone in a city of North China as a case study, a reasonable water resource allocation scheme in 2020 is obtained, illustrating the practicability of this model.