Concept

Pompe à vide

Publications associées (127)

Flow recirculation when pumping liquids with AC electric fields: experiments and simulations

Many popular micropumps implement moving parts that presents serious drawbacks. This is one of the reasons for the growing interest in valveless micropumps. Pumps exploiting AC electric fields are investigated here. Theoretical results are recalled and the ...

2010

EXPERIMENTAL INVESTIGATION OF FLOW INSTABILITIES AND ROTATING STALL IN A HIGH-ENERGY CENTRIFUGAL PUMP STAGE

François Avellan, Maher Kayal, Mohamed Farhat, Laurent Fabre, Stefan Berten, Philippe Dupont

In centrifugal pumps, the interaction between the rotating impeller and the stationary diffuser generates specific pressure fluctuation patterns. When the pump is operated at off design conditions, these pressure fluctuations increase. The resulting rise o ...

ASME2009

Observation of Long-Lived Polariton States in Semiconductor Microcavities across the Parametric Threshold

The excitation spectrum around the pump-only stationary state of a polariton optical parametric oscillator in semiconductor microcavities is investigated by time-resolved photoluminescence. The response to a weak pulsed perturbation in the vicinity of the ...

2009

Optimisation of low pressure processing for honeycomb sandwich structures

Sandra Sequeira Lopes Tavares

Vacuum-bag processing of honeycomb sandwich structures faces particular challenges compared to autoclave sandwich fabrication for aeronautics, a consequence of using, at the most, atmospheric pressure for their manufacturing. In particular, the adhesion of ...

EPFL2009

Wavelength Multicasting of 320 Gb/s Channel in Self-Seeded Parametric Amplifier

Camille Sophie Brès

We report the first 320-Gb/s all-optical wavelength multicast experimental demonstration in two-pump parametric amplifier, assisted by pump-pump self seeding. A single 320-Gb/s channel was successfully multicast to eight wavelengths with minimal conversion ...

Institute of Electrical and Electronics Engineers2009

Electrospray ion beam deposition and mass spectrometry of nonvolatile molecules and nanomaterials

Stephan Rauschenbach

The vacuum deposition of complex functional molecules and nanoparticles by thermal sublimation is often hindered due to their extremely low vapor pressure. This especially impedes the application of ultrahigh vacuum (UHV) based analytical and surface modif ...

EPFL2008

Evaporation based micro pump integrated into a scanning force microscope probe

Nico de Rooij, Terunobu Akiyama, André Meister

A micro pump was integrated into a scanning force microscope probe for circulating liquid through its hollow cantilever and tip. The interior cross section of the cantilever was 2.25 mu m x 3.75 mu m. All fluidic parts were made of SiO2, while the tip apex ...

Elsevier2008

Dynamic stencil lithography on full wafer scale

Jürgen Brugger, Andreea Veronica Savu, Marc Antonius Friedrich van den Boogaart

In this paper, the authors present a breakthrough extension of the stencil lithography tool and method. In the standard stencil lithography static mode, material is deposited through apertures in a membrane (stencil) on a substrate which is clamped to the ...

2008

Experimental Study of Crosstalk in a Pump-Modulated Parametric Multicaster

Camille Sophie Brès

We present an experimental study of crosstalk in a 1:40 multicasting architecture based on a one-pump modulated parametric amplifier. The optimal operating region is determined by an extensive sweep of pump and signal powers. ...

2008

Parametric photoluminescence of spatially confined polaritons in patterned microcavities

Vincenzo Savona

We model the parametric photoluminescence process of laterally confined polaritons in a mesa structure, patterned on a semiconductor microcavity. Parametric processes are described within the lowest order in the polariton-polariton interaction. We show how ...

2008

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