No abstract

Fitness sharing based niching methods have been widely applied to multimodal optimization. However, they often suffer from the so-called niche radius problem as an improper selection of the niche radius may easily lead to suboptimal performance. To address such a problem, a diverse niche radii mechanism has been proposed in this paper. In the proposed algorithm, the radius of each niche will be individually adapted during the evolutionary process. This is achieved by devising and incorporating two operators, namely, niche combination and niche individual elimination, which are used to increase and decrease the radius of each niche, respectively. The proposed method has been evaluated on a set of standard functions . The results show that our method can significantly outperform related methods implemented for comparison.

The removal of Indigo carmine (IC) from the aquatic environment is necessary due to its high toxicity. In this study, methacryloxy ethyltrimethyl ammonium chloride (DMC) modified sisal fiber (SF-DMC) was prepared by a one-step process using radiation induced grafting polymerization. The adsorption performance of SF-DMC toward IC dye was investigated by batch adsorption experiments. The adsorption kinetic studies shows that adsorption equilibrium reached within 30 min, and it can be well described by pseudo-second-order model. The adsorption isotherms are well described by Langmuir model, and the theoretical maximum adsorption capacity are 709.22 to 892.86 mg/g at different temperature. The adsorption of IC onto SF-DMC is a spontaneous and exothermic reaction and low temperature is favorable for adsorption. Besides, SF-DMC has good selective adsorption for IC in the mixed anionic dyes and in high-salt solution. The dyes on SF-DMC can be desorbed by 2mol/L HCl solution. Therefore, the SF-DMC exhibits excellent adsorption performance, which is suitable for IC removal from high-salt wastewater.