Search results for " CO2."
showing 10 items of 160 documents
FLUJOS DE CO2 EN ECOSISTEMAS MEDITERRÁNEOS: INFLUENCIA DE FACTORES BIÓTICOS Y ABIÓTICOS
2016
Tesis Universitat de València, Departament de Microbiologia i Ecologia, Programa de Doctorat en Biodiversitat. Desarrollada en la Estación Experimental de Zonas Áridas en [EN]Almería
Influencia del disolvente en las reacciones orgánicas
2012
La mayoría de los procesos químicos industriales, particularmente de la Química fina, se realizan en disolución. El disolvente puede tener una influencia decisiva en la eficacia de la reacción y es, por tanto, un parámetro estratégico en la planificación de una síntesis. Los disolventes orgánicos, particularmente halogenados y/o aromáticos, plantean problemas en cuanto a su toxicidad, inflamabilidad e impacto medioambiental y por ello su reemplazo por medios alternativos con un menor impacto medioambiental y que mejoren las eficiencias de las reacciones y los procesados finales es un objetivo de interés. Los fluidos supercríticos ofrecen interesantes oportunidades en este campo debido a sus…
Laser treatment of giant xanthelasma palpebrarum
2013
Xanthelasma palpebrarum is the most common cutaneous xanthoma. It typically presents in middle-aged and older adults, most often around the eyelids. The diagnosis is made clinically. Giant xanthelasmas palpebrarum are xanthelasmas that extensively affect the superior and inferior bilateral eyelids. Many techniques have been put forward for treating these lesions (surgical, laser, and chemical techniques), but we describe our experience in the treatment of giant xanthelasmas by ultrapulsed CO2 laser. Between 2009 and 2012, in the Division of Plastic and Reconstructive Surgery at the University of Palermo, 12 patients with giant xanthelasmas were treated using a CO2 laser. The laser parameter…
"Downward steps technique" with CO2 ultrapulsed laser for the treatment of rhinophyma: our protocol.
2013
Abstract BACKGROUND: The rhinophyma is an important soft-tissue hypertrophy of the nose. In literature a wide range of surgical approaches to rhinophyma has been described such as dermoabrasion, scalpel shave, cryosurgery, electrocautery, near total excision with skin grafting, and laser excision. PATIENTS AND METHODS: The authors describe their experience with CO(2) ultrapulsed laser in 14 elderly male patients, using their personal approach, the Downward steps technique. With this technique they removed the pathological hypertrophic tissue using a progressive reduction of the laser power during the treatment. They obtained good results from morphological and aesthetic point of view, in a …
Volcanic CO2 tracks the incubation period of basaltic paroxysms
2021
Description
Vers le contrôle de l'alignement et de l'orientation : théorie et expérience
2010
This thesis is about the control and characterisation of the alignment and orientation of molecules by ultra short laser pulses on a theoretical and experimental approach. Alignment corresponds to a symmetric angular distribution of the molecular axis peaked along the laser field axis, whereas orientation provides an asymmetric distribution favouring one spatial direction. Orientation by sudden two-colour (2+1) pulses is studied extensively for the non resonant case and conditions required for achieving significant orientation are explored. A second two-colour scheme, where the second harmonic is in quasi resonance with a vibrational level of the molecule, is also presented and discussed. T…
C3N4 for CO2 photoreduction: catalyst performance and stability in batch and continuous reactor
2019
In this study, various C3N4 samples were prepared and characterized. CO2 photoreduction was carried out by using C3N4 as powder and coated on glass support in a batch reactor or embedded in a Nafion membrane in a continuous reactor
Graphitic C3N4 for CO2 reduction: a photoactivity and stability study
Effect of Pressure on the Electrochemical Conversion of CO2 to CO
2017
To minimize the negative effect of carbon dioxide as a greenhouse gas and introduce renewable energy in the chemical and energy chain, an interesting approach is the Carbon Capture and Conversion. In this context, one of more appealing conversion strategies is the el Ectrochemical reduction of CO2, which could combines the utilization of excess electric energy from intermittent renewable sources with CO2 (1). Furthermore, CO2 can be selectively converted into various useful chemicals by changing the operating conditions of electrolysis. In particular, an increasing attention has been devoted to the electrochemical conversion of carbon dioxide to carbon monoxide (2,3). The main obstacle of t…
Total CO2 output from Vulcano island (Aeolian Islands, Italy)
2012
Total CO2 output from fumaroles, soil gas, bubbling gas discharges and water dissolved gases discharged from the island, was estimated for Vulcano island, Italy. The CO2 emission from fumaroles from the La Fossa summit crater was estimated from the SO2 crater output, while CO2 discharged through diffuse soil emission was quantified on the basis of 730 measurements of CO2 fluxes from the soil of the island, performed by using the accumulation chamber method. The results indicate an overall output of ≅500 t day 1 of CO2 from the island. The main contribution to the total CO2 output comes from the summit area of the La Fossa cone (453 t day 1), with 362 t day 1 from crater fumaroles and 91 t d…