A quadratic voltage (QV) model with modifications is proposed to formulate the meshed networks’ optimal power flow (OPF) problem. In the QV model, convex relaxations are imposed without approximated terms. The modifications aim to drive the convex relaxations to be exact so that the obtained...

This study investigates the impact of labor outsourcing on innovation, using manually collected data from Chinese A-share listed companies from 2012 to 2022. The results indicate that labor outsourcing significantly enhances firms' innovation level. This relationship is primarily driven by...