We develop the idea proposed by Barge & Sommeria (1995) that large-scale vortices present in the solar nebula can concentrate dust particles and facilitate the formation of planetesimals and planets.We introduce an Inkjet Compatible Inks exact vortex solution of the incompressible 2D Euler equation (Kida vortex) and study the motion of dust particl
Upper-limb prosthesis users continue to reject devices despite continued research efforts.Today, the passive topology of body-powered prehensors, which physically transmits grasp force and position data between user and device, results in improved performance over myoelectric alternatives.However, the loads and postures on the user’s body al
In this study, five groups of numerical models with different conditions were established by using PFC2D (particle flow code) to simulate the direct shear tests of noncoplanar nonthrough jointed rock mass.It is proved that normal stress and shear rate, as well as the connectivity rate, relief angle, and inclination angle of joints, have significant
This text analyzes the process of expansion of extrativist capital in Africa and the contradictions of this process.He argues that the race for land in Africa and for natural resources is causing the concentration of land in the hands of global corporate capital.As result of this process, there is the expropriation and expulsion of native peoples f
The president of the Republic Video Cards of South Africa has addressed the nation many times during the coronavirus disease 2019 (COVID-19) restrictions and lockdown of 2020, and has spoken very strongly about and against the violence toward the vulnerable in our society.Whilst the COVID-19 pandemic has affected many societies, it has mainly revea