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Abelian subgroups of pro-p Galois groups
(Amer Mathematical SocProvidenceEUA, 1998)
Rigid centres on the center manifold of tridimensional differential systems
(2021-01-01)
Motivated by the definition of rigid centres for planar differential systems, we introduce the study of rigid centres on the center manifolds of differential systems on ℝ3. On the plane, these centres have been extensively ...
Variations of geomagnetic cutoff rigidity in the southern hemisphere close to 70°W (South-Atlantic Anomaly and Antarctic zones) in the period 1975–2010
(Elsevier Ltd, 2019)
© 2018 COSPARWe report the existence of rapid variations in (effective) geomagnetic cutoff rigidity (Rc) between the equatorial and Antarctic zones adjacent to the Andes Mountains, revealed by the variation rate of geomagnetic ...
Rigid and semi rigid polyurethane resins: a structural investigation using DMA, SAXS and Le Bail method
(Elsevier BVAmsterdam, 2014-10)
Two different types of polyurethane (PU) resins were synthesized with pre-polymer/polyol (-NCO/-OH) mass proportions of 1:1 (Rigid PU) and 1:1.5 (Semi rigid PU). Based on the results from Dynamic Mechanical Analysis (DMA), ...
Relativistic rigid systems and the cosmic expansion
(Springer/Plenum Publishers, 2020-09)
We analyze the necessary conditions for a body to remain rigid in an expanding cosmological Universe. First, we establish the main theorems and definitions for having a rigid body in a general spacetime as well as the new ...