Articles techniques et présentations

Polymer gels belong to the realm of soft active materials as they are capable of responding to a non-mechanical stimulus – the permeation of a solvent – with a mechanical action – a volume change, thanks to the coupling between different physics. This mechanism of coupling can be ... En savoir plus

Partial differential equations (PDEs) in multiple dimensions may often be solved in a lower dimension if the problem domain contains a symmetry (cylindrical, spherical, translational, etcetera). For problems involving PDEs with helical symmetry we propose a method, with both low ... En savoir plus

Dr. Ivar Kjelberg is Senior Project Manager for Mechatronics in the Systems Engineering Division of CSEM SA in Neuchâtel, Switzerland. He obtained the diploma as \"Ingénieur Physicien\" from the Ecole Polytechnique Fédéreale EPFL in Lausanne, Switzerland in 1979, and a PhD at the local ... En savoir plus

The Oak Ridge National Laboratory (ORNL) is developing technology to re-establish the capability to produce plutonium-238 for the National Aeronautics and Space Administration (NASA) as a power source material for powering vehicles while in deep-space. The High Flux Isotope Reactor ... En savoir plus

The growth of the electronics industry demand better components for the electronic systems. Such components need to be improve to keep up with the evolution of the digital era. The loudspeaker design has not been changed for almost a century [1-5]. The acoustic transducer is the last ... En savoir plus

Nanoantennas have been successfully employed in a wide set of applications. We show the possibility to expand usual nanoantenna functionalities in the THz domain with a gold dipole nanoantenna. We considered an array of aligned planar gold nanoantennas over a silicon substrate. The high ... En savoir plus

Acoustic metamaterials are structured materials of negative mass density or negative bulk-modulus or both of them. Materials are tailored in sub-wavelength dimensions so as to get these negative properties. This paper compares the result of an experimental investigation of acoustic ... En savoir plus

Anchor loss causes a reduction in the quality factor of high frequency micromechanical resonators. This study illustrates the importance of anchor design in mitigating anchor loss in high frequency resonators. The performances of two different anchor configurations for a silicon nitride ... En savoir plus

Woven composites with basalt reinforcement plain 1x1 are examined to define structural mechanics. Woven composites were created by the prepreg technology, 8 layers of plain-weave basalt fabrics were saturated by the precursor, polysiloxane matrix Lukosil®, and joint pressed during ... En savoir plus

Within a borehole a nozzle can be installed in order to increase the efficiency of fluid injection. The position of the nozzle is located near the perforated casing of an injection well. A COMSOL Multiphysics® model is set up for a typical nozzle design as applied in practice. The model ... En savoir plus