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See detailCO2-based sustainable polymers: from CO2-sourced monomers to low CO2 emission foamed materials
Grignard, Bruno ULg; Gennen, Sandro ULg; Alves, Margot ULg et al

Conference (2016, April)

Due to concerns about the climate change combined with the decrease of fossil resources, the use of CO2 as a C1 feedstock for producing added value chemicals and materials has become a huge challenge in ... [more ▼]

Due to concerns about the climate change combined with the decrease of fossil resources, the use of CO2 as a C1 feedstock for producing added value chemicals and materials has become a huge challenge in academic laboratories and in industry. The coupling of CO2 with epoxide has emerged as one of the most promising way to convert CO2 into cyclic carbonates finding application as green solvents or electrolyte for batteries. Interestingly, these cyclic carbonates can also be valorised as monomers to produce new non-isocyanate polyurethanes by step-growth polymerization with amines. Polyurethane (PU) is one of the most important polymers in our everyday life with numerous applications such as thermosets, thermoplastics, elastomers, adhesives, sealants, coatings, rigid and flexible foams for wellness or acoustic and/or thermal insulation. In this talk, we will discuss the preparation of all green bio- and CO2-sourced non-isocyanate polyurethane (NIPU) microcellular foams with thermal insulation properties by using an eco-efficient process based on the supercritical carbon dioxide (scCO2) foaming technology. This talk will be divided in three sections: The synthesis of CO2-sourced cyclic carbonates by coupling CO2 with epoxides using a new highly-efficient bicomponent homogeneous organocatalyst combining the use of an ammonium salt as the catalyst and a fluorinated hydrogen bond donor activator that allows the fast and solvent-free coupling of CO2 with (biosourced) epoxides under mild experimental conditions. The synthesis of (bio- and) CO2-sourced isocyanates-free PUs by melt step-growth copolymerization, eliminating the toxicological issues associated to the conventional synthesis of polyurethanes from diols and isocyanates. The foaming of NIPUs by exploiting the scCO2 foaming technology. By finely choosing the appropriate CO2 impregnation and foaming conditions, thermally insulating CO2-blown microcellular NIPUs foams were produced. [less ▲]

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See detailCO2-blown microcellular non-isocyanate polyurethane (NIPU) foams: from bio- and CO2-sourced monomers to potentially thermal insulating materials
Grignard, Bruno ULg; Thomassin, Jean-Michel ULg; Gennen, Sandro ULg et al

in Green Chemistry (2016), 18(7), 2206-2215

Bio- and CO2-sourced non-isocyanate polyurethane (NIPU) microcellular foams were prepared using supercritical carbon dioxide (scCO2) foaming technology. These low-density foams offer low thermal ... [more ▼]

Bio- and CO2-sourced non-isocyanate polyurethane (NIPU) microcellular foams were prepared using supercritical carbon dioxide (scCO2) foaming technology. These low-density foams offer low thermal conductivity and have an impressive potential for use in insulating materials. They constitute attractive alternatives to conventional polyurethane foams. We investigated CO2’s ability to synthesize the cyclic carbonates that are used in the preparation of NIPU by melt step-growth polymerization with a bio-sourced amino-telechelic oligoamide and for NIPU foaming. Our study shows that CO2 is not only sequestered in the material for long-term application, but is also valorized as a blowing agent in the production of NIPU foams. Such foams will contribute to energy conservation and savings by reducing CO2 emissions. [less ▲]

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See detailCO2-sourced non-isocyanate polyurethanes: from the monomer synthesis to the elaboration of polymeric materials
Gennen, Sandro ULg; Grignard, Bruno ULg; Gilbert, Bernard ULg et al

Conference (2015, July 07)

Due to problems related to the rarefaction of fossil resources and the global warming that comes from CO2 emissions, new carbon feedstocks that are abundant, renewable, non-toxic, inexpensive and ... [more ▼]

Due to problems related to the rarefaction of fossil resources and the global warming that comes from CO2 emissions, new carbon feedstocks that are abundant, renewable, non-toxic, inexpensive and environmentally friendly must be explored to produce chemicals. Besides the valorization of bio-based raw materials, the use of CO2 as a C1 carbon source into added-value products has gained interest in both academic and industrial fields. One promising way to valorize CO2 relies on its chemical fixation onto epoxides to produce cyclic carbonates that find applications as electrolytes in lithium ion batteries, as aprotic polar solvents or as useful intermediates for polycarbonates. Cyclic carbonates also react with primary amines to produce 2-hydroxyethylurethane. This reaction can be extrapolated to the synthesis of non-isocyanate polyurethanes (NIPU) by polyaddition of bifunctional cyclic carbonates with diamines.5 This study focusses on (i) the synthesis of cyclic carbonates using new highly efficient organocatalysts and (ii) their valorization as monomers to produce non-isocyanate polyurethanes. First, we have identified a bicomponent organocatalyst for the very fast synthesis of cyclic carbonates from CO2 and epoxides under very mild reaction conditions. Kinetics of reactions were followed by online Raman spectroscopy. NMR titrations were realized to evidence the mechanism of activation of this novel organocatalytic system that will be discussed in detail this talk. The second objective relies on the development of new efficient organocatalysts for the synthesis of high molar masses NIPUs in short reaction times. Organic compounds interacting with the cyclic carbonate by hydrogen bonding were identified and their catalytic activity was highlighted by a model reaction between ethylene carbonate and a primary amine before extrapolation to the synthesis of NIPUs that find applications as coatings or foamed materials. [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 ▲]

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See detailCoagulation du sang
Fredericq, Léon ULg

in Richet, Charles (Ed.) Dictionnaire de physiologie. 003. Tome III (1898)

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See detailLa coagulation du sang
Fredericq, Léon ULg

in Revue Scientifique (1880), (4 décembre), 537-541

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See detailCoagulopathies in horses with colic.
Monreal, Luis; Cesarini Latorre, Carlota ULg

in The Veterinary clinics of North America. Equine practice (2009), 25(2), 247-58

The most common coagulopathy in horses with colic is a hypercoagulable state associated with disseminated intravascular coagulation. The intensity of this coagulopathy depends on the severity and duration ... [more ▼]

The most common coagulopathy in horses with colic is a hypercoagulable state associated with disseminated intravascular coagulation. The intensity of this coagulopathy depends on the severity and duration of the gastrointestinal lesion, with the ischemic and inflammatory problems and peritonitis being the most frequently affected by coagulopathies. Early initiation of prophylactic therapy significantly reduces the severe hypercoagulable state in horses with intestinal conditions which are recognized to be at high risk for disseminated intravascular coagulation. In addition to the systemic coagulopathy observed in horses with colic, a peritoneal coagulopathy independent from that occurring in blood has been observed, and its recognition and assessment may have clinical usefulness in the diagnosis of the gastrointestinal diseases and outcome. [less ▲]

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See detailCoal gasification at pressure by mixtures of carbone dioxide and oxygen
Marcourt, Marcel; Paquay, Victor; Piel, Albert et al

in Fuel (1983), 62

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See detailCoal Suitability of the Measurement of Unburned Carbon by Laser-induced Breakdown Spectroscopy
Yao, Shunchun; Lu, Jidong; Pan, Shenghua et al

in Proceedings of the CSEE (2009), 29(3), 80-83

Laser-induced breakdown spectroscopy was used to analyze unburned carbon in fly ash. The samples were gotten using fast ashing method and excited by pulse laser and plasma was formed at atmospheric ... [more ▼]

Laser-induced breakdown spectroscopy was used to analyze unburned carbon in fly ash. The samples were gotten using fast ashing method and excited by pulse laser and plasma was formed at atmospheric pressure. The emitted signal which contains the information of unburned carbon in fly ash was detected. The calibration curve constructed base on six samples of one kind of coal ash, and two samples of other two kinds of coal ash were analyzed. The experimental results show that calibration curve constructed with the data from same kind of coal ash can be used to analyze the different kinds of fly ash using proper data processing method. The relative standard deviation of repetition of measured values are less than 8.08%, the relative errors are less than 2.27%. It is indicated that laser-induced breakdown spectroscopy is suitable for rapidly detect unburned carbon in fly ash with receptible applicability. [less ▲]

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See detailCoal-gold agglomeration of alluvial gold
Gaydardzhiev, Stoyan ULg; Kireva, R.; Stoev, S.

in Kemal, Arslan, Akar and Canbazoglu (Ed.) Proceeding of VI-th International Mineral Processing Symposium (1996)

The study concerns feasibility testing of the coal-gold agglomeration process as alternative to the amalgamation for upgrading of alluvial gold fractions found in a dredge line. Different process ... [more ▼]

The study concerns feasibility testing of the coal-gold agglomeration process as alternative to the amalgamation for upgrading of alluvial gold fractions found in a dredge line. Different process parameters such as oild and coal type, coal/oil and agglomerates/gold ratio have been varied with the aim to optimise the degree of gold recovery. The addition of quartz and heavy mineral particles in the slury in view outlining process selectivity is also discussed. [less ▲]

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See detailCoalescence of secondary dispersions in fiber beds
Speth, Hauke; Pfennig, Andreas ULg; Chatterjee, Michael et al

in Separation and Purification Technology (2002), 29(2), 113-119

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See detailCoalescence of Secondary Dispersions in Fiber Beds
Speth, H; Pfennig, Andreas ULg

Conference (2001)

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See detailLa coarctation de l'aorte isthmique (a l'exception des urgences néonatales)
Limet, Raymond ULg

in Revue Médicale de Liège (1995), 50(7), 298-304

Même quand elle est une lésion isolée, la CA est une maladie grave qui altère l'espérance de vie. Les causes de mortalité sont les complications liées à l'hypertension, la rupture spontanée au niveau des ... [more ▼]

Même quand elle est une lésion isolée, la CA est une maladie grave qui altère l'espérance de vie. Les causes de mortalité sont les complications liées à l'hypertension, la rupture spontanée au niveau des dilatations pré- et poststénotiques, au niveau des intercostales, et les anévrysmes disséquants. Le traitement chirurgical, par résection-anastomose ou interposition de greffe, introduit il y a plus de 50 ans, est obéré d'une mortalité faible chez l'adulte (1,3 %). Il ne normalise pas toutefois l'espérance de vie du patient opéré, qui reste un patient à haut risque. Les complications tardives sont proportionnelles à l'importance de l'hypertension préopératoire et à l'âge du patient au moment de l'opération. La guérison de l'hypertension est mieux assurée si le patient a été opéré dans l'enfance. Le taux de resténose est élevé pour les CA opérées avant l'âge de deux ans. Un suivi cardio-vasculaire est indispensable chez tout opéré. [less ▲]

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See detailCoastal and Estuarine Fine Sediment Processes (book review)
Grégoire, Marilaure ULg

in Journal of Marine Systems (2002), 37

Detailed reference viewed: 31 (2 ULg)