Concept

Processus isentropique

Publications associées (69)

Electron relaxation by LO phonons in quantum wires: An adiabatic approach

Benoît Marie Joseph Deveaud, Marc-André Dupertuis

The electron states of weakly-one-dimensional quantum wires are computed using the adiabatic approximation in the framework of the k . p theory and the envelope-function approximation. The computed transition rates of electrons from one confined state to a ...

1997

Prediction of Two-Phase Flow Patterns for Evaporation of Refrigerant R–407C Inside Horizontal Tubes.

John Richard Thome, Daniel Favrat, Olivier Zürcher

Two-phase flow pattern data have been obtained experimentally for R-407C flowing inside 12 mm bore sight glasses, which were located at the outlets of 3 m long, plain bore copper tube heat transfer test sections. The tests covered nominal mass velocities o ...

1997

Relaxation of electrons in weakly-one-dimensional semiconductor quantum wires mediated by LO-phonons

Benoît Marie Joseph Deveaud, Marc-André Dupertuis

A weakly-onedimensional heterostructure is a quantum wire structure tailored so that the carriers are tightly confined in a direction, weakly confined in another and free to move in the third. The electronic bound states are computed using the envelope fun ...

1996

Adiabatic coherence transfer in magnetic resonance of homonuclear scalar-coupled systems

Geoffrey Bodenhausen

By analogy to heteronuclear systems, coherence can be transferred adiabatically in the rotating frame between two selected spins I and S belonging to a homonuclear network of scalar-coupled spins. In contrast to cross polarization with const. radiofrequenc ...

1995

Experimental Investigation of a Hermetic Scroll Expander–Generator.

Daniel Favrat

This paper describes a 1 to 3.5 kWe hermetic scroll expander generator modified from a standard hermetic compressor, an organic Rankine cycle test facility built to test expanders up to 10 kWe and a set of experimental results using HFC 134a in the dry vap ...

1994

NMR cross polarization by adiabatic passage through the Hartmann-Hahn condition (APHH)

Geoffrey Bodenhausen, Serge Hediger

The heteronuclear cross-polarization efficiency in the rotating frame can be improved by sweeping the radiofrequency amplitude adiabatically through the Hartmann-Hahn condition. The enhancement is particularly significant for strongly coupled IS spin syste ...

1994

Interferences in adiabatic transition probabilities mediated by Stockes lines

Charles Pfister

We consider the transition probability for two-level quantum-mechanical systems in the adiabatic limit when the Hamiltonian is analytic. We give a general formula for the leading term of the transition probability when it is governed by N complex eigenvalu ...

1991

A calorimetric study of microbial growth energetics

Urs von Stockar, Ian William Marison

Isothermal reaction calorimetry was employed on the bench scale to measure the enthalpy efficiency and O2 efficiency of growth of several microbial strains cultured on a range of substrates with varying degrees of redn. The obsd. values of these energetic ...

1987

The effect of infrared laser light on the formation of sulfur hexafluoride van der Waals clusters in a supersonic jet

Hubert van den Bergh, René Monot, Matthieu Philippe Emmanuel Zellweger

A mol. beam mass spectrometer was constructed to study the formation of van der Waals clusters over a wide mass range. Using this app. (SF6)m was detected with 1 ? m ? 100 in the adiabatic expansion of SF6. By irradiating the SF6 jet with a continuous-wave ...

1981

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