The widespread, and in many countries unprecedented, use of non-pharmaceutical interventions (NPIs) during the COVID-19 pandemic has highlighted the need for mathematical models which can estimate the impact of these measures while accounting for the highly heterogeneous risk profile of COVID-19.Models accounting either for age structure or the hou

By not only relying on the initial state but also relying on states before, the principle of a self-retrospect dynamic system has been developed to represent the changes in a system since 1991.Afterward, the periphery theory was established, which studies the boundary of a system.We try to integrate the principle of the self-retrospect system and p

Cross sections for compound-nuclear reactions reactions play an important role in models of astrophysical environments and simulations of the nuclear fuel cycle.Providing reliable cross section data ds durga hand soap remains a formidable task, and direct measurements have to be complemented by theoretical predictions and indirect methods.The surro