The problem of H∞ output tracking control for switched time⁃delay systems is investigated by using mode⁃dependent average dwell time method. Using the multiple Lyapunov function method, the condition satisfied by the mode⁃dependent average dwell time was developed, such that the considered systems were exponentially stabilizable with H∞ output tracking performance, the switching controller combining state feedback and tracking error integral was also designed simultaneously. Different from the single average dwell time method, the mode⁃dependent average dwell time method allowed each subsystem of switched systems to possess its own average dwell time, thus it reduced the conservatism of the results. Finally, a numerical example was used to illustrate the effectiveness of the proposed theoretical results.

The adsorption properties of carbonaceous adsorbents (such as, activated carbon, biochar, CNTs and carbon⁃silica composites) for VOCs were summarized in this paper. The influence of the structure of adsorbents, the characteristics of VOCs, the humidity and the adsorption temperature were analyzed respectively. The development prospect of carbonaceous adsorbents in the future VOCs adsorption process was proposed. While continuously increasing the adsorption capacity of carbonaceous adsorbented for VOCs, improving the performance of recycling, reducing the impact of high⁃temperature and humidity environments on the adsorption capacity in industrial production was a new trend in the research and development of carbonaceous adsorbents in the future.