XIGA: An eXtended IsoGeometric analysis approach for multi-material problems

Multi-material problems often exhibit complex geometries along with physical responses presenting large spatial gradients or discontinuities. In these cases, providing high-quality body-fitted finite element analysis meshes and obtaining accurate solutions remain challenging. Immersed boundary techniques provide elegant solutions for such...

Reorientations, relaxations, metastabilities, and multidomains of skyrmion lattices

Magnetic skyrmions are nanosized topologically protected spin textures with particlelike properties. They can form lattices perpendicular to the magnetic field, and the orientation of these skyrmion lattices with respect to the crystallographic lattice is governed by spin-orbit coupling. By performing small-angle neutron scattering measurements,...

Measurements with a redesigned 3D-PTV system in natural and mixed convection

The paper reports on the application of scientific CMOS cameras and high power LED light sources for three-dimensional particle tracking in large enclosures. An open source software is adapted to work with 16 bit grey value images. As fixed thresholds pointed out to be inappropiate for particle detection in 16 bit images due to temporal and...

Modelling and observing the 8.8 Chile and 9.0 Japan earthquakes using GOCE

Large earthquakes do not only heavily deform the crust in the vicinity of the fault, they also change the gravity field of the area affected by the earthquake due to mass redistribution in the upper layers of the Earth. Besides that, for sub-oceanic earthquakes deformation of the ocean floor causes relative sea-level changes and mass...

Regional gravity modeling in terms of spherical base functions

Regional high-resolution spatiotemporal gravity modeling from GRACE data using spherical wavelets

We determine a regional spatiotemporal gravity field over northern South America including the Amazon region using GRACE inter-satellite range-rate measurements by application of a wavelet-based multiresolution technique. A major advantage of this method is that we are able to represent the Amazon hydrological signals in form of time series of...