In order to explore the temporal and spatial variability of non-point source pollution in an agriculture watershed, water quality quantity characteristics five flood events at Shuangqiao station Siheshui watershed (south China) were monitored. Five pollutants, including BOD5, TSS, TP, TN, NH3-N, measured analyzed. The pollutant concentrations load-transport rates investigated. It is shown that ...

The main goal of this article is to analyse the Non-Partisan School movement (EsP, or Escola sem Partido) which articulates social and political actors around a conservative agenda for education in Brazil. Based on Ball’s studies, analyses governance networks using free software, GEPHI, qualitative network methodology. some relevant initiative. research shows that School, though presented as an...

The simplest frequency formulation for conservative oscillators was proposed in 2019 (Results Phys 2019;15:102546). However, it becomes invalid non-conservative oscillators. This work suggests the amplitude-period existence of a periodic solution second-order ordinary differential equation is given, and orbits are easily obtained. To best authors’ knowledge, such powerful result not available l...