Concept

Protocole de Montréal

Publications associées (73)

Four wave mixing effects in gain-equalized distributed fiber raman amplifiers

The degradation of the performance of distributed fiber Raman amplifiers (DFRAs) is shown to be dependent on the interaction between pump-pump four-wave mixing (FWM) and stimulated Raman scattering (SRS), by means of numerical simulations. We verify that F ...

IEEE2007

Implications of sequential use of UV and ozone for drinking water quality

Urs von Gunten, Silvio Canonica

The formation of bromate levels exceeding the drinking water standard of 10 mu g L-1 may impose the reduction of ozone doses used in the treatment of drinking water. This paper illustrates the procedure of evaluating the use of reduced ozone doses while im ...

2006

Comparison of the efficiency of center dot OH radical formation during ozonation and the advanced oxidation processes O-3/H2O2 and UV/H2O2

Urs von Gunten, Silvio Canonica

Comparison of advanced oxidation processes (AOPs) can be difficult due to physical and chemical differences in the fundamental processes used to produce (OH)-O-. radicals. This study compares the ability of several AOPs, including ozone, ozone+H2O2, low pr ...

2006

Ozonation and advanced oxidation of wastewater: Effect of O-3 dose, pH, DOM and HO center dot-scavengers on ozone decomposition and HO center dot generation

Urs von Gunten

The decomposition of ozone in wastewater is observed starting 350 milliseconds after ozone addition. It seems not to be controlled by the autocatalytic chain reaction, hut rather by direct reactions with reactive moieties of the dissolved organic matter (D ...

2006

Ozone transfer and design concepts for NOM decolourization in tubular membrane contactor

Urs von Gunten

Ozonation membrane contact was carried out with a tubular membrane module to study the effects of the flow rates and the temperatures of the liquid phase on ozone transfer and on the enhancement of mass fluxes. Changes in liquid temperature gave both posit ...

2005

Ozonation of carbamazepine in drinking water: Identification and kinetic study of major oxidation products

Urs von Gunten

Kinetics and product formation of the anti-epileptic drug carbamazepine (CBZ) were investigated in lab-scale experiments during reactions with ozone and OH radicals. Ozone reacts rapidly with the double bond in CBZ, yielding several ozonation products cont ...

2005

Protein adsorption in static microsystems: effect of the surface to volume ratio

Hubert Girault, Andrea Lionello

A numerical model for the adsorption kinetics of proteins on the walls of a microchannel has been developed using the finite element method (FEM) to address the coupling with diffusion phenomena in the restricted microchannel volume. Time evolutions of the ...

Royal Society of Chemistry2005

Fate of volatile fluorinated compounds in the subsurface

Christian Balsiger

Since their discovery around 1930, the synthetic compounds of the class of chlorofluorocarbons (CFCs) have been produced and used worldwide at very large scale. Their physico-chemical properties (non-flammability, chemical inertia, miscibility with water a ...

EPFL2004

A Formal Model of Rational Exchange and Its Application to the Analysis of Syverson's Protocol

Jean-Pierre Hubaux, Levente Buttyan, Srdan Capkun

We propose a formal model of rational exchange and exchange protocols in general, which is based on game theory. In this model, an exchange protocol is represented as a set of strategies in a game that is played by the protocol parties and the network that ...

2004

Ozone detection by differential absorption spectroscopy at ambient pressure with a 9.6 mu m pulsed quantum-cascade laser

Hubert van den Bergh, Bertrand Calpini, Valentin Simeonov, Jérôme Faist

We report direct absorption spectroscopic detection of ozone at ambient pressure with a pulsed, DFB quantum-cascade laser (QCL) tuned within 1044-1050 cm(-1) by temperature scanning. Wavelength calibration curves were derived from FTIR and CO2 spectra and ...

Springer-Verlag2004

Graph Chatbot

Chattez avec Graph Search

Posez n’importe quelle question sur les cours, conférences, exercices, recherches, actualités, etc. de l’EPFL ou essayez les exemples de questions ci-dessous.

AVERTISSEMENT : Le chatbot Graph n'est pas programmé pour fournir des réponses explicites ou catégoriques à vos questions. Il transforme plutôt vos questions en demandes API qui sont distribuées aux différents services informatiques officiellement administrés par l'EPFL. Son but est uniquement de collecter et de recommander des références pertinentes à des contenus que vous pouvez explorer pour vous aider à répondre à vos questions.

Connectez-vous pour utiliser Chat avec Graph Search