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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 ▲]

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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 ▲]

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See detailCoacervation of copolymers of lactic and glycolic acids. Part B : The encapsulation step.
Stassen, S; Nihant, N; Grandfils, Christian ULg et al

Poster (1992, April 01)

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See detailUn coach pour nos entreprises
Nondonfaz, Robert ULg

Article for general public (2007)

Nécessité pour chaque entreprise de se faire "coacher" pour repréciser les pistes d'amélioration

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See detailCoach-athlete relationship in non-competitive context: case study in a martial arts school
Lenzen, Benoit; Dejardin, Robert; Piéron, Maurice et al

in European Association for Sport Management (EASM) (Ed.) Leadership and human resources in sport management. Book of Proceedings (2001)

During the last two decades, the coach-athlete relationship has been the theme of many research programs. Leadership theory has been meterialised in the form of the LSS-questionnaire and inspired several ... [more ▼]

During the last two decades, the coach-athlete relationship has been the theme of many research programs. Leadership theory has been meterialised in the form of the LSS-questionnaire and inspired several authors. Most of these studies revealed that coaches and athletes do not have the same perception about coaches' actual leadership behaviours. Such discrepancies could lead to conflicts and need to be studies by using a qualitative approach. ... [less ▲]

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See detailCoaches’ thinking process: Analysis of decisions related to tactics during sports games
Cloes, Marc ULg; Bavier, Krystel; Piéron, Maurice

in Chin, M. K.; Hensley, L. D.; Liu, Y. K. (Eds.) Innovation and application of physical education and sports science in the new millennium - An Asia-Pacific Perspective (2001)

A three-step model of coaches’ tactical thinking process is proposed: pre-interactive, interactive and post-interactive decisions. This study focuses on the interactive decisions. Its first objective was ... [more ▼]

A three-step model of coaches’ tactical thinking process is proposed: pre-interactive, interactive and post-interactive decisions. This study focuses on the interactive decisions. Its first objective was to verify if a coach is able to report these decisions at the end of a game. The second objective was to analyse the goals and factors inducing the decisions. Data were collected during and after four games directed by two coaches, one in basketball, and the other in volleyball. Their teams participated in the second division of the Belgian national championship (1998-1999). The research method was similar to that developed by Gilbert, Trudel, and Haughian (1999). Coaches reported a limited number (1 to 9) of tactical decisions immediately after each game. Decisions reported by the coaches and additional decisions selected by researchers from videotapes of the games were used for stimulated recall interviews. A total of 82 decisions were analysed with the basketball coach and 88 with the volleyball coach. Data analysis was considered separately for each coach. Calling time out, player substitutions, and tactical cues were the most frequently analysed decisions. Adapting the team strategy and providing information or directives were the priority goals of the decisions. Most of the decisions were determined by subjective field information. [less ▲]

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See detail"Coaching" assisté par la vidéo dans le cadre du CAPAES en langues modernes à l'Université de Liège
Simons, Germain ULg

Conference (2011, June 07)

Cette communication présente un dispositif de formation proposé dans le cadre du C.A.P.A.E.S. en langues modernes organisé par l'Université de Liège (Belgique). Plus précisément, elle analyse le soutien ... [more ▼]

Cette communication présente un dispositif de formation proposé dans le cadre du C.A.P.A.E.S. en langues modernes organisé par l'Université de Liège (Belgique). Plus précisément, elle analyse le soutien individuel que le formateur apporte à chaque étudiant ("coaching") dans la conception, la mise en pratique et l'évaluation d'une séquence didactique expérimentale. Une des leçons de la séquence est intégralement filmée et fait l'objet d'un séminaire d'autocopie avec l'étudiant. Les extraits vidéo sont également utilisés pour illustrer la séance de partage d'expériences en fin d'année. Enfin, une fois didactisées, les séquences vidéo servent à illustrer le cours de didactique professionnelle et à l'ancrer davantage dans la pratique professionnelle des étudiants-enseignants. [less ▲]

Detailed reference viewed: 46 (17 ULg)