A. Mellouki - Academia.edu (original) (raw)

Papers by A. Mellouki

Aerosol Science and Technology, 2008

Atmospheric Environment, 2018

reactions play a very important role in air pollution. For the majority of chemical compounds of ... more reactions play a very important role in air pollution. For the majority of chemical compounds of theatmosphere, the reaction with OH radicals is an intermediate one, part of a long chain reaction. A Laser Photolysis-LaserInduced Fluorescence (LP-LIF) technique has been used to study OH reaction kinetics with dioxane. The apparatus consistsof two synchronized pulsed laser systems, a six cross flow I

Environmental Science and Pollution Research, 2015

The Journal of Physical Chemistry A, 2006

The Cl atom initiated oxidation of C(6)F(13)CH(2)OH, C(6)F(13)CHO, and C(3)F(7)CHO was investigat... more The Cl atom initiated oxidation of C(6)F(13)CH(2)OH, C(6)F(13)CHO, and C(3)F(7)CHO was investigated at 298 K and 1000 mbar pressure of air in a photoreactor using in situ Fourier transform infrared (FTIR) analysis. The rate coefficient for the reaction Cl + C(6)F(13)CH(2)OH (reaction 2) was measured using a relative method: k(2) = (6.5 +/- 0.8) x 10(-13) cm(3) molecule(-1) s(-1). C(6)F(13)CHO was detected as the major primary product, while CO and CF(2)O were found to be the major secondary products. A fitting procedure applied to the concentration-time profiles of C(6)F(13)CHO provided a production yield of (1.0 +/- 0.2) for this aldehyde in reaction 2, and the rate coefficient for the reaction Cl + C(6)F(13)CHO (reaction 4) was k(4) = (2.8 +/- 0.7) x 10(-12) cm(3) molecule(-1) s(-1). A high CO yield observed in the oxidation of C(6)F(13)CH(2)OH, (52 +/- 1)%, is attributed to the Cl atom initiated oxidation of C(6)F(13)CHO. High CO yields, (61 +/- 2)% and (85 +/- 5)%, were also measured in the Cl atom initiated oxidation of C(3)F(7)CHO in air and nitrogen, respectively. These high CO yields suggest the occurrence of a decomposition reaction of the perfluoroacyl, C(6)F(13)CO, and C(3)F(7)CO radicals to form CO which will compete with the combination reaction of these radicals with oxygen to form perfluoroacyl peroxy radicals in the presence of air. The latter radicals C(n)F(2)(n)(+1)CO(O)(2) (n = 6-12), through their reaction with HO(2) radicals, are currently considered as a possible source of persistent perfluorocarboxylic acids which have been detected in the environment. The consequences of the present results would be a reduction of the strength of this potential source of carboxylic acids in the atmosphere.

The Journal of Physical Chemistry A, 2006

Journal of Environmental Sciences, 2012

Zeitschrift für Physikalische Chemie, 2010

An experimental investigation on the photolysis of the pesticide chloropicrin, (trichloronitromet... more An experimental investigation on the photolysis of the pesticide chloropicrin, (trichloronitromethane, CCl3NO2), under atmospheric conditions was carried out at the outdoor European Photoreactor, (EUPHORE), in Valencia, Spain. The photodissociation rate coefficient, J obs(CCl3NO2), was determined directly under sunlight conditions during spring and summer months. Values in the range J obs(CCl3NO2) = (3.9–5.1)×10−5 s−1 were obtained, corresponding to photolysis lifetimes of 7.1–5.4 hours. Absorption cross-sections for chloropicrin were determined over the wavelength range 260–370 nm, and together with the measured solar flux intensity, were used to calculate the maximum photolysis rate for chloropicrin, J max. Comparison of the observed photolysis rate with the calculated maximum photolysis rate showed that the effective quantum yield of photodissociation, Φ = J obs(CCl3NO2)/J max, was 0.94±0.08. Photolysis of chloropicrin in air or nitrogen gave phosgene as the major carbon-containi...

International Journal of Chemical Kinetics, 1992

International Journal of Chemical Kinetics, 2000

The rate constants for the reactions of the OH radicals with a series of aldehydes have been meas... more The rate constants for the reactions of the OH radicals with a series of aldehydes have been measured in the temperature range 243–372 K, using the pulsed laser photolysis-pulsed laser induced fluorescence method. The obtained data for propanaldehyde, iso-butyraldehyde, tert-butyraldehyde, and n-pentaldehyde were as follows (in cm3 molecule−1 s−1): (a) in the Arrhenius form: (5.3 ± 0.5) × 10−12 exp[(405 ± 30)/T], (7.3 ± 1.9) × 10−12 exp[(390 ± 78)/T], (4.7 ± 0.8) × 10−12 exp[(564 ± 52)/T], and (9.9 ± 1.9) × 10−12 exp[(306 ± 56)/T]; (b) at 298 K: (2.0 ± 0.3) × 10−11, (2.6 ± 0.4) × 10−11, (2.7 ± 0.4) × 10−11, and (2.8 ± 0.2) × 10−11, respectively. In addition, using the relative rate method and alkanes as the reference compounds, the room-temperature rate constants have been measured for the reactions of chlorine atoms with propanaldehyde, iso-butyraldehyde, tert-butyraldehyde, n-pentaldehyde, acrolein, and crotonaldehyde. The obtained values were (in cm3 molecule−1 s−1): (1.4 ± 0.3) × 10−10, (1.7 ± 0.3)10−10, (1.6 ± 0.3) × 10−10, (2.6 ± 0.3) × 10−10, (2.2 ± 0.3) × 10−10, and (2.6 ± 0.3) × 10−10, respectively. The results are presented and discussed in terms of structure-reactivity relationships and atmospheric importance. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 32: 676–685, 2000

Environmental Science and Pollution Research, 1998

International audienc

Atmospheric Chemistry and Physics, 2013

Ajavon, Ayité-Lo Université de Lomé Togo Andersen, Stephen O. Environmental Protection Agency USA... more Ajavon, Ayité-Lo Université de Lomé Togo Andersen, Stephen O. Environmental Protection Agency USA Austin, John NOAA Geophysical Fluid Dynamics Laboratory USA Bais, Alkiviadis F. Aristotle University of Thessaloniki Greece Baldwin, Mark NorthWest Research Associates, Inc. USA Beig, Gufran Indian Institute of Tropical Meteorology India Björn, Lars Olof Lund University Sweden Bodeker, Greg National Institute of Water & Atmospheric Research New Zealand Braathen, Geir World Meteorological Organization Switzerland Burrows, John University of Bremen Germany Chanin, Marie-Lise Service d'Aeronomie du CNRS France Chipperfield, Martyn University of Leeds UK Clerbaux, Catherine Service d'Aeronomie du CNRS France Cunnold, Derek Georgia Institute of Technology USA Dameris, Martin German Aerospace Center (DLR) Institut für Physik der Atmosphäre Germany

Progrès en Urologie

Objectif L’adenomectomie voix haute (AVH) assistee par robot represente une alternative chirurgic... more Objectif L’adenomectomie voix haute (AVH) assistee par robot represente une alternative chirurgicale emergeante pour les hypertrophies benignes de prostate (HBP) de haut volume. L’approche transvesicale pourrait permettre de traiter dans le meme temps operatoire d’eventuelles complications diverticulaires associees. Nous en decrivons la technique chirurgicale, les resultats et le risque de complications identifiees par assistance video. Methodes Un patient de 70 ans, sans antecedent chirurgical, presentant une HBP symptomatique de 80 g compliquee d’un diverticule de 350cc, a beneficie d’une AVH robotique avec diverticulectomie synchrone par voie transvesicale. L’intervention etait realisee avec un robot Da-Vinci X® surgical system(intuitive Surgical Inc, Sunnyvale, CA, USA) 4 bras et 2 instruments assistants. Les trocarts places en transperitoneal suivaient une ligne convexe en haut en sus-ombilical, apres open-coelioscopique. Les instruments assistants etaient en pararectal et fosse iliaque gauche. Le robot etait a droite du patient place en Trendelenburg −30°, jambes a l’horizontale, sonde vesicale Ch18 en place. L’intervention etait enregistree pour relecture, les temps operatoires controles. Resultats L’intervention a ete realisee en un seul temps en 4 h, temps de console de 3h40. L’HBP et le diverticule pesaient 62 g et 110 g, respectivement. Les suites operatoires etaient marquees par une complication precoce de douleurs abdominales gauches irradiant dans le dos et une elevation de la creatininemie a 135 μmol/L. Un TDM abdomino-pelvien injecte a J2 revelait une dilatation pyelo-calicielle bilaterale predominant a gauche avec urinome traitee par nephrostomie gauche a J2. Le controle video de l’enregistrement permit d’identifier une section ureterale gauche lors de la dissection a la 17eme minute. Une re-implantation uretero-vesicale gauche par mini-laparotomie a ete realisee. Le controle mictionnel a 3 mois etait satisfaisant, IPSS 4, Qol 1 avec un residu post-mictionnel reduit mais significatif de 244 mL. Conclusion L’adenomectomie avec diverticulectomie par voie transvesicale robotique en un temps est realisable. L’assistance video post-operatoire permet le controle et l’identification des complications. L’enregistrement systematique des interventions pourrait beneficier a la securisation des pratiques.

Chemical & Engineering News

Aerosol Science and Technology, 2008

Atmospheric Environment, 2018

reactions play a very important role in air pollution. For the majority of chemical compounds of ... more reactions play a very important role in air pollution. For the majority of chemical compounds of theatmosphere, the reaction with OH radicals is an intermediate one, part of a long chain reaction. A Laser Photolysis-LaserInduced Fluorescence (LP-LIF) technique has been used to study OH reaction kinetics with dioxane. The apparatus consistsof two synchronized pulsed laser systems, a six cross flow I

Environmental Science and Pollution Research, 2015

The Journal of Physical Chemistry A, 2006

The Cl atom initiated oxidation of C(6)F(13)CH(2)OH, C(6)F(13)CHO, and C(3)F(7)CHO was investigat... more The Cl atom initiated oxidation of C(6)F(13)CH(2)OH, C(6)F(13)CHO, and C(3)F(7)CHO was investigated at 298 K and 1000 mbar pressure of air in a photoreactor using in situ Fourier transform infrared (FTIR) analysis. The rate coefficient for the reaction Cl + C(6)F(13)CH(2)OH (reaction 2) was measured using a relative method: k(2) = (6.5 +/- 0.8) x 10(-13) cm(3) molecule(-1) s(-1). C(6)F(13)CHO was detected as the major primary product, while CO and CF(2)O were found to be the major secondary products. A fitting procedure applied to the concentration-time profiles of C(6)F(13)CHO provided a production yield of (1.0 +/- 0.2) for this aldehyde in reaction 2, and the rate coefficient for the reaction Cl + C(6)F(13)CHO (reaction 4) was k(4) = (2.8 +/- 0.7) x 10(-12) cm(3) molecule(-1) s(-1). A high CO yield observed in the oxidation of C(6)F(13)CH(2)OH, (52 +/- 1)%, is attributed to the Cl atom initiated oxidation of C(6)F(13)CHO. High CO yields, (61 +/- 2)% and (85 +/- 5)%, were also measured in the Cl atom initiated oxidation of C(3)F(7)CHO in air and nitrogen, respectively. These high CO yields suggest the occurrence of a decomposition reaction of the perfluoroacyl, C(6)F(13)CO, and C(3)F(7)CO radicals to form CO which will compete with the combination reaction of these radicals with oxygen to form perfluoroacyl peroxy radicals in the presence of air. The latter radicals C(n)F(2)(n)(+1)CO(O)(2) (n = 6-12), through their reaction with HO(2) radicals, are currently considered as a possible source of persistent perfluorocarboxylic acids which have been detected in the environment. The consequences of the present results would be a reduction of the strength of this potential source of carboxylic acids in the atmosphere.

The Journal of Physical Chemistry A, 2006

Journal of Environmental Sciences, 2012

Zeitschrift für Physikalische Chemie, 2010

An experimental investigation on the photolysis of the pesticide chloropicrin, (trichloronitromet... more An experimental investigation on the photolysis of the pesticide chloropicrin, (trichloronitromethane, CCl3NO2), under atmospheric conditions was carried out at the outdoor European Photoreactor, (EUPHORE), in Valencia, Spain. The photodissociation rate coefficient, J obs(CCl3NO2), was determined directly under sunlight conditions during spring and summer months. Values in the range J obs(CCl3NO2) = (3.9–5.1)×10−5 s−1 were obtained, corresponding to photolysis lifetimes of 7.1–5.4 hours. Absorption cross-sections for chloropicrin were determined over the wavelength range 260–370 nm, and together with the measured solar flux intensity, were used to calculate the maximum photolysis rate for chloropicrin, J max. Comparison of the observed photolysis rate with the calculated maximum photolysis rate showed that the effective quantum yield of photodissociation, Φ = J obs(CCl3NO2)/J max, was 0.94±0.08. Photolysis of chloropicrin in air or nitrogen gave phosgene as the major carbon-containi...

International Journal of Chemical Kinetics, 1992

International Journal of Chemical Kinetics, 2000

The rate constants for the reactions of the OH radicals with a series of aldehydes have been meas... more The rate constants for the reactions of the OH radicals with a series of aldehydes have been measured in the temperature range 243–372 K, using the pulsed laser photolysis-pulsed laser induced fluorescence method. The obtained data for propanaldehyde, iso-butyraldehyde, tert-butyraldehyde, and n-pentaldehyde were as follows (in cm3 molecule−1 s−1): (a) in the Arrhenius form: (5.3 ± 0.5) × 10−12 exp[(405 ± 30)/T], (7.3 ± 1.9) × 10−12 exp[(390 ± 78)/T], (4.7 ± 0.8) × 10−12 exp[(564 ± 52)/T], and (9.9 ± 1.9) × 10−12 exp[(306 ± 56)/T]; (b) at 298 K: (2.0 ± 0.3) × 10−11, (2.6 ± 0.4) × 10−11, (2.7 ± 0.4) × 10−11, and (2.8 ± 0.2) × 10−11, respectively. In addition, using the relative rate method and alkanes as the reference compounds, the room-temperature rate constants have been measured for the reactions of chlorine atoms with propanaldehyde, iso-butyraldehyde, tert-butyraldehyde, n-pentaldehyde, acrolein, and crotonaldehyde. The obtained values were (in cm3 molecule−1 s−1): (1.4 ± 0.3) × 10−10, (1.7 ± 0.3)10−10, (1.6 ± 0.3) × 10−10, (2.6 ± 0.3) × 10−10, (2.2 ± 0.3) × 10−10, and (2.6 ± 0.3) × 10−10, respectively. The results are presented and discussed in terms of structure-reactivity relationships and atmospheric importance. © 2000 John Wiley & Sons, Inc. Int J Chem Kinet 32: 676–685, 2000

Environmental Science and Pollution Research, 1998

International audienc

Atmospheric Chemistry and Physics, 2013

Ajavon, Ayité-Lo Université de Lomé Togo Andersen, Stephen O. Environmental Protection Agency USA... more Ajavon, Ayité-Lo Université de Lomé Togo Andersen, Stephen O. Environmental Protection Agency USA Austin, John NOAA Geophysical Fluid Dynamics Laboratory USA Bais, Alkiviadis F. Aristotle University of Thessaloniki Greece Baldwin, Mark NorthWest Research Associates, Inc. USA Beig, Gufran Indian Institute of Tropical Meteorology India Björn, Lars Olof Lund University Sweden Bodeker, Greg National Institute of Water & Atmospheric Research New Zealand Braathen, Geir World Meteorological Organization Switzerland Burrows, John University of Bremen Germany Chanin, Marie-Lise Service d'Aeronomie du CNRS France Chipperfield, Martyn University of Leeds UK Clerbaux, Catherine Service d'Aeronomie du CNRS France Cunnold, Derek Georgia Institute of Technology USA Dameris, Martin German Aerospace Center (DLR) Institut für Physik der Atmosphäre Germany

Progrès en Urologie

Objectif L’adenomectomie voix haute (AVH) assistee par robot represente une alternative chirurgic... more Objectif L’adenomectomie voix haute (AVH) assistee par robot represente une alternative chirurgicale emergeante pour les hypertrophies benignes de prostate (HBP) de haut volume. L’approche transvesicale pourrait permettre de traiter dans le meme temps operatoire d’eventuelles complications diverticulaires associees. Nous en decrivons la technique chirurgicale, les resultats et le risque de complications identifiees par assistance video. Methodes Un patient de 70 ans, sans antecedent chirurgical, presentant une HBP symptomatique de 80 g compliquee d’un diverticule de 350cc, a beneficie d’une AVH robotique avec diverticulectomie synchrone par voie transvesicale. L’intervention etait realisee avec un robot Da-Vinci X® surgical system(intuitive Surgical Inc, Sunnyvale, CA, USA) 4 bras et 2 instruments assistants. Les trocarts places en transperitoneal suivaient une ligne convexe en haut en sus-ombilical, apres open-coelioscopique. Les instruments assistants etaient en pararectal et fosse iliaque gauche. Le robot etait a droite du patient place en Trendelenburg −30°, jambes a l’horizontale, sonde vesicale Ch18 en place. L’intervention etait enregistree pour relecture, les temps operatoires controles. Resultats L’intervention a ete realisee en un seul temps en 4 h, temps de console de 3h40. L’HBP et le diverticule pesaient 62 g et 110 g, respectivement. Les suites operatoires etaient marquees par une complication precoce de douleurs abdominales gauches irradiant dans le dos et une elevation de la creatininemie a 135 μmol/L. Un TDM abdomino-pelvien injecte a J2 revelait une dilatation pyelo-calicielle bilaterale predominant a gauche avec urinome traitee par nephrostomie gauche a J2. Le controle video de l’enregistrement permit d’identifier une section ureterale gauche lors de la dissection a la 17eme minute. Une re-implantation uretero-vesicale gauche par mini-laparotomie a ete realisee. Le controle mictionnel a 3 mois etait satisfaisant, IPSS 4, Qol 1 avec un residu post-mictionnel reduit mais significatif de 244 mL. Conclusion L’adenomectomie avec diverticulectomie par voie transvesicale robotique en un temps est realisable. L’assistance video post-operatoire permet le controle et l’identification des complications. L’enregistrement systematique des interventions pourrait beneficier a la securisation des pratiques.

Chemical & Engineering News