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Gravitation, électromagnétisme, interactions faible et forte. Dans notre vision moderne de la physique, l'univers est régi par quatre interactions fondamentales. Le Modèle Standard de la physique des particules est une théorie des champs quantique relativi ...
In recent years, power variations and energy criteria have been the main motivations for developing regenerative drive converters for elevators [1]. A better performing solution for power smoothing can be easily found by using a supercapacitor-based storag ...
A blue resonant cavity light emitting diode with a 50% Al-content crack-free GaN/AlGaN distributed Bragg reflector is reported. The structure shows excellent optical properties and the benefits of the cavity structure are clearly seen in the narrowed spect ...
A downscaled drive train with a 6.5 kW fuel cell and a 10 kW supercapacitor module was realized and tested. The voltage levels and the energy flow between fuel cell and supercapacitor were controlled by an electronic unit. The combined fuel-cell/supercapac ...
In recent years, power variations and energy criteria have been the main motivations for developing regenerative drive converters for elevators [1]. A more performant solution for power-smoothing can be easily found by using a supercapacitor based storage ...
In recent years, power variations and energy criteria has been the main motivation for developing regenerative drive converters for elevators [1]. A more performant solution for power-smoothing can be easily found by using a supercapacitor based storage de ...
Photoluminescence (PL) spectroscopy has been used to investigate the effect that annealing temperature and ambient has on annealed molecular beam epitaxy grown GaN. Significant differences induced by the different annealing conditions occur in the PL spect ...
Dynamic power management is a design methodology aiming at controlling performance and power levels of digital circuits and systems, with the goal of extending the autonomous operation time of battery-powered systems, providing graceful performance degrada ...
The effective piezoelectric transverse coefficient e(31,f) was measured on various lead zirconate-titanate (PZT) and aluminum nitride thin films. The measurement set-up is based on the collection of the electric charges created by the forced deflection of ...
A SOFC concept based on microtubular cells is presented. Mechanical tests and modelling show viability for fast thermal cycling in air for both zirconia and ceria electrolyte tubes. To combine advantages of both these materials, the concept includes a thin ...