Concept

Masse volumique

Publications associées (306)

Intube Flow Boiling of R-407C and R-407C/Oil Mixtures. Part 1: Microfin Tube

John Richard Thome, Daniel Favrat, Olivier Zürcher

Intube evaporation tests for R-407C and R-407C/oil are reported for a microfin tube. The tests were run at a nominal inlet pressure of 6.45 bar (93.5psia) at mass velocities of 100, 200 and 300 kg/m2s (73581, 147162 and 220743 lb/h ft2) over nearly the ent ...

1998

A first principles study of small Cu-n clusters based on local-density and generalized-gradient approximations to density functional theory

Alfredo Pasquarello

Neutral and anionic Cu-n clusters (Cu-2, Cu-3, Cu-6 and Cu-7(-)) are studied within density functional theory via (a) the local-density approximation (LDA) and (b) the generalized-gradient approximation (GGA) of Perdew and Wang (GGA-PW) for exchange and co ...

1998

Numerical Simulation of Macrosegregation : a Comparison between FVM and FEM Predictions and a Confrontation with Experiments

Michel Rappaz, Jacques Rappaz, Jean-Luc Desbiolles

Micro-macrosegregation calculations have been performed for a rectangular cavity containing either a Pb-48 wt pct Sn alloy or a Sn-5 wt pct Pb alloy. The numerical results calculated with a finite volume method (FVM) and a finite element method (FEM) are c ...

1998

Towards Amperometric Immunosensor Devices

In contrast to optical immunosensors, the electrochemical detection of an immunoanalytical reaction does require a labeling, but allows an easier discrimination of specific and non-specific binding. We present a concept and first results for a multivalent ...

1997

Coulomb correlation and band gap renormalization at high carrier densities in quantum wires

Elyahou Kapon, Benoît Marie Joseph Deveaud, Daniel Oberli

We have studied the luminescence of narrow quantum wires at photoexcitation densities of up to similar to 3 x 10(6) cm(-1). We show that even at these densities, which are well above the expected Mott density of 8 x 10(5) cm(-1), excitonic recombination do ...

1997

Resonant femtosecond emission from quantum well excitons: The role of Rayleigh scattering and luminescence

Benoît Marie Joseph Deveaud

We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of secondary radiation. At high exciton densities, the emission ...

1997

Fabrication and sintering of fine yttria-doped ceria powder

Jan Van Herle

Yttria-doped ceria powder was prepared from oxalate precursors. The oxalate coprecipitation bath parameters were closely monitored and found to influence the sintering behavior of the subsequently obtained oxide powders strongly. The use of concentrated (C ...

1997

Relevance of dephasing processes for the ultrafast rise of emission from resonantly created excitons in quantum wells

Benoît Marie Joseph Deveaud

We present a comparative study of time-integrated four-wave-mixing and femtosecond emission under resonant excitation on excitons in weakly disordered GaAs quantum wells. At highest exciton densities when dephasing dominates the spectral width (homogeneous ...

1997

Control by density effects of the Rydberg-valence configuration mixing in matrix isolated NO

Majed Chergui

D. effects and N2 co-doping of Kr solids doped with NO allow continuous tuning of the NO Rydberg state energies in a range 0.35 to 0.68 eV blue of the gas phase. This property is exploited to control the vibronic configuration mixing between the Rydberg C2 ...

1993

Density Limits and Disruptions in the Tca Tokamak

Basil Duval, Antoine Pochelon, Roland Behn

Density limit disruptions have been studied during the current flat-top of TCA. Disruption occurs at two different densities, depending on discharge programming. The highest densities are achieved by a strong influx of neutral gas called 'hard gas puffing' ...

1992

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