In this paper we consider the resource-constrained project scheduling problem with a flexible project structure and continuous activity durations. A mathematical model based on the resource-flow formulation is developed to tackle this problem. Due to the NP-hard nature of the problem, this...

We assess the effects of the historically unprecedented expansion of U.S. unemployment insurance (UI) payments during the COVID-19 pandemic. The adverse economic impacts of the pandemic, notably the pattern of job losses and earnings reductions, were disproportionately borne by lower-income...

This study investigates the effects of organic zirconia nanoparticle reinforcement (0.5–5 wt%) on the mechanical and thermal, properties of polybutylene terephthalate (PBT) composites. Mechanical tests revealed enhanced strength, toughness, and hardness, with optimal performance at 2% zirconia...

Background: Due to the highly competitive nature of the retail sector, companies need to improve their operational efficiency. This study focuses on the application of the concepts of Lean production in the process of replenishing products on the shelves of the shops of one of the largest food...