No abstract

No abstract

In order to promote the decomposition of pollutants, potassium peroxodisulphate (PDS) has been added to a gas‐liquid dielectric barrier discharge (DBD) reactor with rod plate configuration for processing tetracycline (TC) wastewater. The effects of applied voltage, PDS dose, discharge gap, initial pH and TC concentration are discussed. The results show that the addition of PDS can significantly improve the removal efficiency of TC, the kinetic constant and the energy utilization of DBD. Compared with DBD treatment alone, the removal efficiency of TC (80 mg/L) can be increased by 45.5% after adding 0.6 g/L PDS. The TC removal efficiency increases with the increase of applied voltage and the decrease of TC concentration and discharge gap. The PDS dose has an optimal value. Weakly alkaline conditions are conducive to the removal of TC. Inorganic ions (Cl− and NO3−) have a significant effect on removing TC. The overall findings suggest an effective method to remove organic pollutants in wastewater.

Abstract. This work focuses on the general decay stability of nonlinear stochastic differential equations with unbounded delay. A Razumikhintype theorem is first established to obtain the moment stability but without almost sure stability. Then an improved edition is presented to derive not only the moment stability but also the almost sure stability, while existing Razumikhin-type theorems aim at only the moment stability. By virtue of the M -matrix techniques, we further develop the aforementioned Razumikhin-type theorems to be easily implementable. Two examples are given for illustration.

No abstract