The Variation Evolving Method (VEM), which seeks the optimal solutions with the variation evolution principle, is further developed to be more flexible in solving the Optimal Control Problems (OCPs) with terminal constraint. With the first-order stable dynamics to eliminate the infeasibilities, the Modified Evolution Partial Differential Equation (MEPDE) that is valid in the infeasible solution...

Activated carbon fiber (ACF) as extraction fiber for solid-phase microextraction (SPME) and its application for the analysis of banned organochlorine pesticides (OCPs) were investigated. Firstly, ACF was activated by different concentration of zinc chloride, which indicated that ACF activated by 60% zinc chloride had a reasonable specific surface area, pore volume and pore distribution. Secondl...

We propose a Model Predictive Control (MPC) framework to generate feedback controls for time-varying nonlinear systems with input constraints. We provide for this framework a set of conditions on the design parameters that are sufficient to guarantee the stability of the closed-loop response. This sufficient condition for stability allows MPC practitioners to verify a priori that a given set of...

We have developed a new method for single-drop microextraction (SDME) for the preconcentration of organochlorine pesticides (OCP) from complex matrices. It is based on the use of a silicone ring at the tip of the syringe. A 5 μL drop of n-hexane is applied to an aqueous extract containing the OCP and found to be adequate to preconcentrate the OCPs prior to analysis by GC in combination with tan...

With the prohibition of conventional organochlorine pesticides (OCPs), extensive use and continuous release current-use (CUPs), such as organic amine (OAPs) organophosphate (OPPs), in agriculture mariculture activities have raised global attention. In this study, occurrence distribution 36 from above 3 categories were investigated seawater sediment Beibu Gulf, a typical subtropical agricultural...

In this paper, it is analyzed the temporal variation of organochlorine pesticides (OCPs) in water and sediments from a river influenced by activity an agricultural field tropical country during period 2013-2016. The novelty consists increasing studies concentrations OCPs rivers for contributing to establish thresholds that allow protect biota soils waters. mean values dissolved sorbed on varied...

This paper analyzes the interplay between dissipativity and stability properties in continuous-time infinite-horizon Optimal Control Problems (OCPs). We establish several relations these properties, which culminate a set of equivalence conditions. Moreover, we investigate convergence optimal adjoint trajectories. The workhorse for our investigations is notion strict OCPs, has been coined contex...