Stiffness topology optimization is usually based on a state problem of linear elasticity, and there seems to be little discussion on what is the limit for such a small rotation-displacement assumption. We show that even for gross rotations that are in all practical aspects small (< 3 deg), topology optimization based on a large deformation theory might generate different design concepts compare...

The objective of this study is to minimize the drag coefficient of aerodynamics bodies for a specified design Reynolds number regime. With the aerodynamics model the gradient of the objective function (drag coefficient) cannot be determined analytically. Furthermore, it is expected that the objective function is multi-modal, i.e. it shows more than one minimum. Therefore, the optimization algor...

ABSTRACT The extraordinary weather conditions available between February and March 2022 over Spain have allowed us to analyse the brightest fireballs recorded by monitoring stations of Spanish Meteor Network (SPMN). We study atmospheric flight 15 large meteoroids determine if they are meteorite dropper events prepare campaigns search for freshly fallen extraterrestrial material. investigate the...

Researchers have successfully imaged the collision of a pair micrometer-wide jets made tin particles.