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See detailCO2 CAPTURE in POWER PLANTS: Process Simulation and Solvent Degradation
Léonard, Grégoire ULg; Lepaumier, Hélène; Thielens, Marie-Laure et al

Poster (2012, November)

Presentation of the research themes studied at the University of Liège in the field of CO2 capture

Detailed reference viewed: 34 (1 ULg)
See detailCO2 culling with Influenza Containment Systems (ICS)
Kamers, B.; Everaert, Nadia ULg; Tona, K. et al

Poster (2010)

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Peer Reviewed
See detailCO2 deposition over the multi-year ice of the western Weddell Sea
Zemmelink, H. J.; Delille, Bruno ULg; Tison, J. L. et al

in Geophysical Research Letters (2006), 33(13),

Field measurements by eddy correlation (EC) indicate an average uptake of 0.6 g CO2 m(-2) d(-1) by the ice-covered western Weddell Sea in December 2004. At the same time, snow that covers ice floes of the ... [more ▼]

Field measurements by eddy correlation (EC) indicate an average uptake of 0.6 g CO2 m(-2) d(-1) by the ice-covered western Weddell Sea in December 2004. At the same time, snow that covers ice floes of the western Weddell Sea becomes undersaturated with CO2 relative to the atmosphere during early summer. Gradients of CO2 from the ice to the atmosphere do not support significant diffusive fluxes and are not strong enough to explain the observed CO2 deposition. We hypothesize that the transport of air through the snow pack is controlled by turbulence and that undersaturation of CO2 is caused by biological productivity at the ice-snow and snow-atmosphere interface. The total carbon uptake by the multi-year ice zone of the western Weddell Sea in December could have been as high as 6.6 Tg C y(-1). [less ▲]

Detailed reference viewed: 38 (4 ULg)
See detailCO2 dynamics and related air-ice-sea gas transfer in spring pack and land fast sea ice,
Delille, Bruno ULg; Schoemann, V.; Lannuzel, D. et al

Poster (2007, March)

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See detailCO2 emission from mangroves’ surrounding waters
Borges, Alberto ULg; Delille, Bruno ULg; Frankignoulle, M.

Poster (2003, April)

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See detailCO2 exchange above a cultivated savanna in sudanian region in northern part of Benin (West Africa)
Ago, Expédit Evariste ULg; Agbossou, Euloge; Galle, Sylvie et al

Poster (2011, October)

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See detailCO2 fertilization enhances carbon over-consumption during a phytoplankton bloom
Riebesell, U.; Bellerby, R.; Carbonnel, V. et al

Conference (2004, October)

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See detailCO2 fluxes across the air-ice interface
Delille, Bruno ULg

Conference (2014, July)

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See detailCO2 fluxes exchanged by a 4-year crop rotation cycle
Aubinet, Marc ULg; Moureaux, Christine ULg; Bodson, Bernard ULg et al

Poster (2009, April)

Detailed reference viewed: 36 (19 ULg)
Peer Reviewed
See detailCO2 laser laparoscopic surgery. Adhesiolysis, salpingostomy, laser uterine nerve ablation and tubal pregnancy
Donnez, Jacques; NISOLLE, Michelle ULg

in Bailliere's Clinical Obstetrics & Gynaecology (1989), 3(3), 525-43

Used endoscopically, the CO2 laser offers some advantages over other operative techniques for endometriosis and adhesions but, in spite of the continuing development of new instrumentation there are still ... [more ▼]

Used endoscopically, the CO2 laser offers some advantages over other operative techniques for endometriosis and adhesions but, in spite of the continuing development of new instrumentation there are still problems with the system. The technique needs specialized equipment requiring ongoing biomedical maintenance and specialized technical care in the operating room. Some problems such as the intraperitoneal accumulation of smoke, gas leakage, and difficulty with maintenance of proper beam alignment still occur. In spite of these problems the advantages are numerous: the system allows precise bloodless destruction of diseased tissue and eliminates the risks of cautery. In the hands of an experienced laparoscopist, it appears safe and effective in vaporization of endometriotic lesions, utero-sacral neurectomy, adhesiolysis and salpingostomy. The judicious use of these techniques, combined with carefully planned further investigations by well-trained and experienced laparoscopists and continuing improvements in the delivery systems, will soon reveal the true efficacy of the CO2 laser laparoscope. If studies continue to show pregnancy rates and pain relief to be equivalent to those patients treated by laparotomy, CO2 laser laparoscopy will become the preferred procedure for the management of pelvic endometriosis and its associated adhesions, distal tubal occlusion, pelvic pain and tubal pregnancy. With the exception of using the argon laser to treat endometriosis, the selective absorption characteristic of lasers has not been greatly utilized. While the CO2 laser is heavily absorbed by water and hence vaporizes most cells in a rather indiscriminate fashion, this is not true for other wavelengths, such as argon, Nd-YAG, KTP, krypton, xenon, copper and gold vapour lasers. The energy form of each of these lasers has different properties of penetration, absorption, reflection and heat dissipation. Many of these lasers have not yet been evaluated in human subjects. An exciting, although not new, area of possible laser application involves the use of photosensitizers and fluorescing agents (Dougherty et al, 1978). Some recent experimental studies (Schellhas and Schneider, 1986; Schneider et al, 1988) may lead to new therapeutic possibilities. The surgical laser is not, however, a panacea. Only controlled trials carried out carefully over the next few years will clearly define its potential. In the meantime it is incumbent upon all of us to investigate the clinical, gynaecological and surgical applications in a careful, methodical and scientific manner. [less ▲]

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See detailCO2 measurement in sea ice
Geilfus, Nicolas-Xavier ULg; Delille, Bruno ULg; Verbeke, V. et al

Poster (2007, March 02)

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See detailCO2 reforming of methane: valorizing CO2 by means of Dielectric Barrier Discharge
Machrafi, Hatim ULg; Cavadias, Simeon; Amouroux, Jacques

in IOP Conference Series: Materials Science and Engineering (2011), 19(1), 012006

The impact of pollution on the environment is causing several problems that are to be reduced as much as possible. One important example is the production of CO2 that is emitted by many transport and ... [more ▼]

The impact of pollution on the environment is causing several problems that are to be reduced as much as possible. One important example is the production of CO2 that is emitted by many transport and industrial applications. An interesting solution is to view CO2 as a source instead of a product that can be stocked. The case considered in this work is the CO2 reformation of methane producing hydrogen and CO. It is an endothermic reaction, for which the activition barrier needs to be overcome. The method of Dielectric Barrier Discharge can do this efficiently. The process relies on the collision of electrons, which are accelerated under an electrical field that is created in the discharge area. This leads to the formation of reactive species, which facilitate the abovementioned reaction. The determination of the electron density is performed by PLASIMO. The study is subsequently continued using the Reaction Engineering module in COMSOL (with an incorporated kinetic mechanism) in order to model the discharge phase. Then COMSOL (continuity and Navier-Stokes equations) is used to model the flow in the post-discharge phase. The results showed that both a 2D and 3D model can be used to model the chemical-plasma process. These methods need strongly reduced kinetic mechanism, which in some cases can cause loss of precision. It is also observed that the present experimental set-up that is modeled needs to be improved. A suggestion is made. [less ▲]

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See detailCO2 total column retrieval by mid-IR FT Spectroscopy
Buschmann, M; Dohe, S; Mahieu, Emmanuel ULg et al

in Geophysical Research Abstracts (2012), 14

Over the last decade ground-based remote sensing measurements of CO2 have been established as an important component in the global observing system for greenhouse gases. Since 2004 the Total Carbon Column ... [more ▼]

Over the last decade ground-based remote sensing measurements of CO2 have been established as an important component in the global observing system for greenhouse gases. Since 2004 the Total Carbon Column Observing Network (TCCON) sites have provided CO2 retrievals in the near-IR region. CO2 can also be retrieved in the mid-IR spectral region and it would be of great benefit to use these spectra to produce CO2-data of sufficient precision. With this, 20 years of additional observations obtained in the mid-IR at a suite of FT-IR sites of the Network Detection of Atmospheric Composition Change (NDACC) will be accessible. We investigated a series of different CO2 microwindows in the mid-IR spectral region and present results from the most promising candidates for a showcase FT-IR site (Ny Alesund). Limitations of the approach are outlined and the feasibility of a future Mid-IR CO2-product of sufficient precision is discussed. [less ▲]

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See detailCO2 valorization
Léonard, Grégoire ULg; Amouroux, Jacques

E-print/Working paper (2010)

Brief presentation of the results achieved during a workshop on CO2 valorization

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See detailCO2 valorization by means of dielectric barrier discharge
Machrafi, Hatim ULg

in Journal of Physics: Conference Series (2011), 275(1, art_number=012016),

As atmospheric pollution is causing several environmental problems it is incumbent to reduce the impact of pollution on the environment. One particular problem is the production of CO2 by many transport ... [more ▼]

As atmospheric pollution is causing several environmental problems it is incumbent to reduce the impact of pollution on the environment. One particular problem is the production of CO2 by many transport and industrial applications. Instead of stocking CO2 and instead of being a product, it can be used as a source. The case considered is the CO2 reformation of methane producing hydrogen and CO. It is an endothermic reaction, for which the activation barrier needs to be surpassed. This can be done efficiently by the method of Dielectric Barrier Discharge. The process relies on the collision of electrons, which are accelerated under an electrical field that is created in the discharge area. This leads to the formation of reactive species, which facilitate the abovementioned reaction. This study is performed using a Matlab program with the Reaction Engineering module in COMSOL (with an incorporated kinetic mechanism) in order to model the discharge phase. Then COMSOL (continuity and Navier-Stokes equations) is used to model the flow in the post-discharge phase. The results showed that both a 2D and 3D model can be used to model the chemical-plasma process. These methods need strongly reduced kinetic mechanism, which in some cases can cause loss of precision. [less ▲]

Detailed reference viewed: 34 (1 ULg)
Peer Reviewed
See detailCO2 valorization by means of dielectric barrier discharge
Machrafi, Hatim ULg; Cavadias, S.; Amouroux, J.

(2010)

In order to reduce atmospheric pollution by CO2 (by transport and industrial applications), CO2 can be used as a source, instead of stocking it as a product. The case considered is the reaction between ... [more ▼]

In order to reduce atmospheric pollution by CO2 (by transport and industrial applications), CO2 can be used as a source, instead of stocking it as a product. The case considered is the reaction between CO2 and methane producing hydrogen: CO2 + CH4 2 CO + 2 H2 H° = 258.9 kJ/mole. The activation barrier of this endothermic reaction needs to be surpassed. The method of Dielectric Barrier Discharge (DBD) can be used, needing less energy than heating or catalytic pyrolysis. The process relies on the collision of electrons (forming reactive species), accelerated under an electrical field in the discharge area, facilitating the abovementioned reaction. The first step of the simulation in this work presents a 1D model in Matlab (Poisson equation, conservation of electrons and ions), obtaining an average electron and ion density. This is then introduced in a kinetic model of CH4/CO2 dissociation via electron collisions in the discharge region (Reaction Engineering module in COMSOL). Then COMSOL (continuity and Navier- Stokes equations) is used to model the flow in the post-discharge phase (reactions between vibrationally excited CO2 and CH4). Preliminary calculations for a plasma reactor model show that when the reactor wall is heated at 1000K, without electrical discharge, the decomposition of CO2 is 7.5%. With electrical discharge, the same decomposition is attained at a lower temperature, namely 880K. [less ▲]

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See detailCO2, CH4 and N2O dynamics and fluxes in the brackish Lake Grevelingen (The Netherlands)
Borges, Alberto ULg; Meysman, Filip; Harlay, Jérôme ULg

Poster (2013)

Lake Grevelingen in the South West Netherlands is a former estuary locked off from the sea by two dikes and a brackish lake since 1971 (salinities from 29 to 33 during our sampling). It is connected with ... [more ▼]

Lake Grevelingen in the South West Netherlands is a former estuary locked off from the sea by two dikes and a brackish lake since 1971 (salinities from 29 to 33 during our sampling). It is connected with the North Sea by sluices, has a surface area of 108 km2, a mean depth of 5.3 m, a maximum depth of 48 m, and about 60% of the area the depth is less than 5 m. In summer, anoxia occurs in bottom waters. From January 2012 to December 2012 a biogeochemical survey was conducted at monthly interval at a fixed station (35 m depth) at Den Osse. Here, we focus on the analysis of partial pressure of CO2, and concentrations of CH4 and N2O obtained throughout the water column. pCO2 followed a typical seasonal cycle for temperate coastal environments shifting from CO2 over-saturation in winter to spring CO2 under-saturation due to the spring phytoplankton bloom, and shifting back to over-saturation in fall. Unlike the adjacent Southern Bight of the North Sea and the adjacent Oosterschelde, CO2 under-saturation prevailed in summer in Lake Grevelingen. CH4 values were minimal in winter ( 20 nM) and as stratification developed during spring and summer a distinct maximum of CH4 (up to 730 nM) developed at the pycnocline (5 to 10 m). N2O showed little seasonal variations and only a very faint increase with depth, except in August when bottom waters became anoxic. At this time, N2O shown a maximum ( 22 nM) at the oxycline (probably related to enhanced N2O production by nitrification at low O2 concentrations), and decreased in the anoxic layer ( 3 nM) (probably related to denitrification). [less ▲]

Detailed reference viewed: 40 (4 ULg)