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See detailMonitoring delivery chains in a supply chain using multivariate control charts
Faraz, Alireza ULg; Heuchenne, Cédric ULg; Saniga, Erwin et al

Conference (2011, July 13)

The theory of the delivery chain considers the delivery of goods and services to customers within a specific time interval. Nowadays, organizations are focusing to satisfy their customers’ demands not ... [more ▼]

The theory of the delivery chain considers the delivery of goods and services to customers within a specific time interval. Nowadays, organizations are focusing to satisfy their customers’ demands not only to meet the expectations for products quality but also in delivery times through managing delivery chains. Obviously it is desirable that a company has minimum delivery time of goods and services to its customers. Therefore, establishing economic and reliable control charts for monitoring the key characteristics of delivery chain is of great importance especially for managers to improve the whole delivery chains performance. On the other hand, as we shall see in the present paper, the performance of a delivery chain is multivariate in nature because customers do not evaluate a delivery performance with a univariate mindset and also there are usually several production and delivery sites, and variety of different methods of transportation of goods and services. In this paper, we propose a relatively new application of the economic statistical design of the multivariate T2 control chart to monitor the delivery chain performance and it is illustrated through a case study in the TNT express mail in Iran. [less ▲]

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See detailIs there value in maintaining small populations ? Example of the Dual-Purpose Belgian Blue breed.
Gengler, Nicolas ULg; Soyeurt, Hélène ULg; Bastin, Catherine ULg et al

Conference (2011, July 13)

Current status of thinking on genomic selection in dairy cattle is mostly major breed centric (e.g., Holstein) and only for traditional traits (e.g., milk yields). Once you depart from this, it becomes ... [more ▼]

Current status of thinking on genomic selection in dairy cattle is mostly major breed centric (e.g., Holstein) and only for traditional traits (e.g., milk yields). Once you depart from this, it becomes obvious that different, often related, issues appear (e.g., lack of large training populations, need for expensive recording of new phenotypes). Also, there is an urgent need to rethink issues that are important for sustainability of dairy production (e.g., added value foods, animal robustness). In this context, small populations (breeds/lines) could represent a potential source of extra information to justify their maintenance. As marker densities increase, efficient dissection of different selection histories of divergent breeds or lines, potentially identifying pockets of unexploited variability will increase. A current example from the Belgian (Walloon) perspective is the Dual Purpose (DP) line of the Belgian Blue Breed (BBB), with presently around 4500 breeding females, for historical reason of which only 1500 have good pedigrees, and which is present in Belgium and northern France. Recent research, done on this line, showed its tendency to produce less saturated milk fat and to have better fertility. Results indicated that it could stay competitive in specific markets, especially because of largely increased meat value. Currently, the myostatin mutation is largely used for breeding purposes. To assess the genetic diversity of the breed, recently, over 200 genotypes (SNP50K) for nearly all breeding bulls of the last 20 years became available. HD genotypes should be available in the near future, also allowing to access selection history of this breed as being in between the 2 extreme breeds: Beef BBB (with which it shares a recent history) and Holstein-Friesian (which is related through its geographic proximity over centuries). Finally, genomic selection for DP-BBB will need to consider a single step type approach without the need of reference population and potentially relying heavily on SNP3K of cows, also with the objective to recreate relationships between animals of interest. [less ▲]

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See detailMémoire versus souvenir: photographie, torture et cinéma
Hamers, Jérémy ULg

Conference (2011, July 12)

Detailed reference viewed: 94 (11 ULg)
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See detailNatural and invariant quantizations
Radoux, Fabian ULg

Conference (2011, July 12)

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See detailA recursive method of approximation of the inverse of genomic relationships matrix
Faux, Pierre ULg; Gengler, Nicolas ULg; Misztal, Ignacy

Conference (2011, July 11)

Genomic evaluations by some procedures such as genomic BLUP (GBLUP) or single-step GBLUP (ssGBLUP) use the inverse of the genomic relationship matrix (G). The cost to create such an inverse is cubic and ... [more ▼]

Genomic evaluations by some procedures such as genomic BLUP (GBLUP) or single-step GBLUP (ssGBLUP) use the inverse of the genomic relationship matrix (G). The cost to create such an inverse is cubic and becomes prohibitively expensive after 30–100k genotypes. The purpose of this study was to develop methodologies, which eventually could compute a good approximation of G−1 at reduced cost. A recursive approximation of the inverse is based on a decomposition similar to that for the pedigree-based relationship: G−1 = (T−1)’D−1T−1, where T is a triangular and D a diagonal matrix. In the first step, animals are processed from the oldest to the youngest. For each animal, a subset of ancestors is selected with coefficients of genomic relationship to that animal greater than a threshold. A system of equations is created where the coefficients of G for the selected ancestors are in the left hand side and the coefficients of G for the given animal corresponding to the ancestors are the right hand side. The solution to that system of equation is stored in one line of T. Then, D is computed as diagonal elements of T−1G(T−1)’. If off-diagonals of D are too large, the approximation to G can be improved by repeated applications of G−1 = (T−1)’D−1T−1 and D = T−1G(T−1)’. After n rounds, the approximation of G inverse is a product of 2n triangular matrices and one diagonal matrix. This recursive method has been assessed on a sample of 1,718 genotyped dairy bulls. The correlation between GEBV using the complete or approximated G were 0.54 in the first round, 0.96 in the second, and 0.99 in the third. The cost of the proposed method depends on the population structure. It is likely to be high for closely related animals but lower for populations where few animals are strongly related. Additional research is needed to identify near-sparsity in T and D to eliminate unimportant operations. [less ▲]

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See detailInside the Jupiter Main Auroral Emissions: Flares, Spots, Arc...and Satellite Footprints?
Bonfond, Bertrand ULg; Vogt, M. F.; Yoneda, M. et al

Conference (2011, July 11)

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See detailA recursive method of approximation of the inverse of genomic relationship matrix
Faux, Pierre ULg; Misztal, Ignacy; Gengler, Nicolas ULg

Conference (2011, July 11)

Approximation of the inverse of the genomic relationship matrix is obtained by a similar algorithm to that of the pedigree-based relationship matrix. A recursive use of this algorithm returns a better ... [more ▼]

Approximation of the inverse of the genomic relationship matrix is obtained by a similar algorithm to that of the pedigree-based relationship matrix. A recursive use of this algorithm returns a better approximation of the inverse after each round of recursion, until it reaches the real inverse. [less ▲]

Detailed reference viewed: 41 (6 ULg)
See detailMapping Jupiter's auroral features to magnetospheric sources: Comparing results from three different models for Jupiter's ionospheric magnetic field
Vogt, M. F.; Kivelson, M. G.; Khurana, K. K. et al

Conference (2011, July 11)

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See detailLe royaume de Mari et les Amorrites au 19ème siècle av.-JC
Colonna d'Istria, Laurent ULg

Conference (2011, July 11)

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See detailA capacity game in transportation management
Amand, Guillaume ULg; Arda, Yasemin ULg

Conference (2011, July 10)

This study analyzes the contractual relation between a retailer and a carrier with the aim of determining possible deviations from the optimal system performance. In order to face a random demand, the ... [more ▼]

This study analyzes the contractual relation between a retailer and a carrier with the aim of determining possible deviations from the optimal system performance. In order to face a random demand, the retailer submits a contract to the carrier based on the number of units transported and on the number of truck used. Then, before uncertainty is resolved, the carrier decides of the number of trucks that he reserves. Once the demand is known, the carrier may also request additional trucks at a higher cost. The result shows that the proposed contract does not coordinate the supply chain. [less ▲]

Detailed reference viewed: 36 (11 ULg)
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See detailLegitimacy in social enterprises: is it also a question of governance?
Rijpens, Julie ULg

Conference (2011, July 09)

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See detailHow to measure quality in job transitions?
Levêque, Audrey ULg; Orianne, Jean-François ULg; Pichault, François ULg

Conference (2011, July 08)

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See detailChoisir des cas exemplaires La Strategic litigation dans la lutte contre les discriminations liées à l’emploi en Belgique
Lejeune, Aude ULg; Orianne, Jean-François ULg

Conference (2011, July 07)

Dans plusieurs pays européens, les organismes publics nationaux de promotion de l’égalité des chances et de lutte contre les discriminations, appelés Equality Bodies, recourent à une pratique de « ... [more ▼]

Dans plusieurs pays européens, les organismes publics nationaux de promotion de l’égalité des chances et de lutte contre les discriminations, appelés Equality Bodies, recourent à une pratique de « Strategic litigation ». Inspirée par les pratiques anglo-saxonnes de common law, elle consiste à utiliser l’arène judiciaire pour faire avancer la jurisprudence dans certaines matières. Il s’agit plus précisément de sélectionner, parmi les cas individuels que traitent ces organismes, les dossiers qui sont exemplaires et qui pourront permettre aux magistrats de créer une jurisprudence positive dans certains domaines particuliers du droit. Au-delà de la contrainte budgétaire qui les empêche de défendre tous les cas, leur objectif est de se positionner comme un acteur stratégique en utilisant les cours et tribunaux comme des espaces d’action politique. Notre communication s’appuie sur une recherche de terrain qui traite des discriminations liées à l’emploi en Belgique. Notre matériau empirique se compose principalement d’entretiens et d’observations dans les deux centres chargés de la promotion de l’égalité des chances en Belgique (le Centre pour l’égalité des chances et la lutte contre le racisme et l’Institut pour l’égalité des femmes et des hommes) : entretiens de juristes de première et de seconde lignes, entretiens avec les plaignants, observation d’interactions aux « guichets » et au sein des équipes. En outre, nous avons réalisé une vaste analyse documentaire : consultation de dossiers depuis le dépôt de la plainte jusqu’au jugement, examen de rapports d’activité, de notes de travail internes aux services, etc. Enfin, nous avons procédé à des entretiens complémentaires d’avocats et de magistrats en charge de ces dossiers. Ce riche matériau nous permet d’analyser le processus de choix de cas exemplaires et ses implications. L’étude met tout d’abord en lumière les arguments auxquels se réfèrent les juristes qui sont amenés à sélectionner les dossiers en qualifiant certains cas « d’exemplaires ». Ensuite, elle examine l’articulation entre les revendications individuelles des plaignants, liées à leur propre histoire personnelle, avec les stratégies collectives de publicisation de ces centres. Enfin, elle interroge la stratégie judiciaire qui, dans un pays de droit continental, peut nourrir d’autres stratégies de lobbying politique en dehors des cours et tribunaux. [less ▲]

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See detailMorpho-Imaging : a veterinary website of anatomy and imaging
Noble, Prisca ULg; van Thielen, Bert; Verhelle, Filip et al

Conference (2011, July 07)

Introduction: The Morpho-Imaging website is based on an interactive multi-dimensional presentation of the anatomy and its relevant imaging. Its objective is to teach a practical approach of veterinary ... [more ▼]

Introduction: The Morpho-Imaging website is based on an interactive multi-dimensional presentation of the anatomy and its relevant imaging. Its objective is to teach a practical approach of veterinary anatomy that must be adapted to the clinician work. Methods: From domestic animals : imaging (Radiography, Magnetic Resonance Imaging, Computed Tomography and Echography) was performed and correspondant dissections (Osteology, Arthrology and Myology) were photographed. Morpho-Imaging and its content was produced using Adobe programs. It was hosted on the RVC1 multimedia platform and linked to the educational Philips iSiteTM Picture Archiving and Communication System (PACS) of the VUB5. Results: Morpho-Imaging consists of three major components named anatomy, imaging and pathological imaging. The pages are transversally and vertically connected with others, and always surmounted by a navigation bar with drop-down menus (DDM). The first DDM corresponds to the anatomy menu by species, the second and third DDMs correspond to the normal and pathological Imaging respectively. The Morpho-Imaging website is linked towards to WikiVet1 and the PACS5 by means of URL’s. Conclusion: The three dimensional viewing of anatomy and pathology is better presented using modern visualization tools and techniques, such as Volume Rendering Technique and Multi Planar Reconstruction. In addition, a real anatomic related atlas of multiple imaging sources is available for the users. Morpho-Imaging is a valuable tool used to challenge the cognitive process during training sessions of veterinary anatomy and imaging. [less ▲]

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See detailManaging Hybridity: (Inter-)Organizational Strategies in the Fair Trade Field
Huybrechts, Benjamin ULg

Conference (2011, July 07)

This paper aims to examine the concrete strategies through which organizations may reach compromises between conflicting logics. To reach this goal, this paper tries to capture some of the interactions ... [more ▼]

This paper aims to examine the concrete strategies through which organizations may reach compromises between conflicting logics. To reach this goal, this paper tries to capture some of the interactions between the organizational, inter-organizational and field levels in terms of management and diffusion of plural logics, using the case of social enterprises in the Fair Trade field. [less ▲]

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See detailLes éco-quartiers : une alternative à l'étalement urbain ?
Halleux, Jean-Marie ULg; Strée, Julie ULg; Fiebig, B.

Conference (2011, July 07)

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See detailHorseshoeing styles comparison and detection of subclinic equine digit discomfort during movement
Noble, Prisca ULg; Lejeune, Jean-Philippe ULg; Serteyn, Didier ULg et al

Conference (2011, July 07)

Introduction: For the sound equine forelimb, ground reaction force (GRF) peaks to ~0.8-1 BodyWeight (BW) during the trot (4m/s). Little work investigates the effect of different horsehoeing styles ... [more ▼]

Introduction: For the sound equine forelimb, ground reaction force (GRF) peaks to ~0.8-1 BodyWeight (BW) during the trot (4m/s). Little work investigates the effect of different horsehoeing styles, directly on the limb GRF distribution and indirectly on the equine digit comfort during movement. This study investigates GRF distribution after application of different aluminium horseshoeing styles during movement. Methods: Two horses (H1,H2; mean 575kg) were used. However H2 had an old healed flexor tendons lesion, the horses were judged to be sound on locomotor examination (without lameness). According to the rules that respect the foot biomechanical balance, they were trimmed and shod with a non-broken foot-pastern axis. On the day of the tests, they were led on a treadmill at a trot (4m/s). Kinetics were collected, using a F-Scan system, during 3 following sessions : to both forehooves after application of classic roller, eggbarr and equi+ horseshoes. For each session, data from 3 strides for each left forelimb of each horse were averaged and kinetics (GRF) were obtained. Results: For the classic roller, eggbarr and equi+ horseshoes, GRF peaked respectively to 0.57+-0.006;0.36+-0.005;0.83+-0.009BW for H1 and 0.61+-0.007;0.84+-0.007;0.51+-0.009BW for H2. Theses horseshoes loading differences show a dynamic load transfer from the forelimbs to the hindlimbs, that is the result of a subclinic (without lameness) equine digit discomfort during movement. Conclusions: Subclinic equine digit discomfort after application of horshoes has been detected using the F-Scan system during movement. These results confirm the interest of the equi+ horseshoes on horses without flexor tendon lesion. [less ▲]

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See detailPrésentation d’une méthodologie d’évaluation qualitative de l’environnement sonore dans trois communes belges
Colon, Paul-Louis ULg

Conference (2011, July 06)

The paper presents a methodology of qualitative souyndscape assessment in three communities in Belgium. It aims to improve the management of environmental noise, taking into account the feeling and ... [more ▼]

The paper presents a methodology of qualitative souyndscape assessment in three communities in Belgium. It aims to improve the management of environmental noise, taking into account the feeling and experience of the sonic environment. After a brief presentation of the implementation of the project, I will present its theoretical assumptions and methodological difficulties and the prospects it opens. [less ▲]

Detailed reference viewed: 35 (6 ULg)
See detailIntervention en tant que "Grand Témoin"
Poumay, Marianne ULg

Conference (2011, July 06)

En clôture du séminaire de la DGSIP, cette intervention en tant que "Grand Témoin" retrace les éléments marquants de deux jours de conférence et les place en perspective de la situation belge.

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See detailLe SoTL en action : Une forme de recherche « en classe »
Poumay, Marianne ULg

Conference (2011, July 06)

Cette conférence introduit, puis illustre le courant SoTL (Scholarship of Teaching and Learning). Elle présente six recherches menées par des enseignants inscrits au Master Complémentaire "Formasup", de l ... [more ▼]

Cette conférence introduit, puis illustre le courant SoTL (Scholarship of Teaching and Learning). Elle présente six recherches menées par des enseignants inscrits au Master Complémentaire "Formasup", de l'Université de Liège, dans lequel chaque enseignant inscrit est appelé à mener une recherche à l'échelle de sa propre classe. Ces six illustrations sont présentées avec leurs impacts, ce qui permet une réflexion sur l'intérêt de ce type de recherche en classe et la façon dont il se distingue de la recherche en éducation. [less ▲]

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See detailAccompagner les enseignants à la pédagogie universitaire numérique : quelles questions ? Quelles commpétences ?
Poumay, Marianne ULg

Conference (2011, July 05)

Après avoir évoqué quelques principes liés à l'accompagnement des enseignants et posé les jalons du métier de conseiller pédagogique, la conférence se centre sur le conseil techno-pédagogique. Elle aborde ... [more ▼]

Après avoir évoqué quelques principes liés à l'accompagnement des enseignants et posé les jalons du métier de conseiller pédagogique, la conférence se centre sur le conseil techno-pédagogique. Elle aborde ensuite la façon d'aider les enseignants à devenir conseillers, pour terminer sur quelques défis, ou missions de ces conseillers. [less ▲]

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See detailRandom Handshaking and Information Recovery Between Scales and Models
Ghanem, Roger; Arnst, Maarten ULg; Phipps, Eric et al

Conference (2011, July 05)

Detailed reference viewed: 27 (4 ULg)
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See detailOverview of performance evaluation tools and their relevance to social enterprises
Mouchamps, Hugues ULg

Conference (2011, July 05)

This paper reviews a broad range of performance evaluation tools available for social enterprises and compare them. Therefore we develop an analytical framework based on the specificities of social ... [more ▼]

This paper reviews a broad range of performance evaluation tools available for social enterprises and compare them. Therefore we develop an analytical framework based on the specificities of social enterprises and on performance management theory. This framework incorporates the most relevant criteria that will allow to determine whether a tool includes the ideal characteristics to evaluate performance in social enterprises and to what extent. Three of the most representative and widespread tools, the balanced scorecard, the social return on investment and the global reporting initiative framework, are then studied and compared through this analytical framework. [less ▲]

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See detailRegional scale groundwater flow and transport modelling: from conceptual challenges to pragmatic numerical solutions
Wildemeersch, Samuel ULg; Goderniaux, Pascal ULg; Leroy, Mathieu et al

Conference (2011, July 05)

National and international regulations require the management of groundwater resources at the regional scale, considering the physical limits of hydrogeological systems. Physically-based, spatially ... [more ▼]

National and international regulations require the management of groundwater resources at the regional scale, considering the physical limits of hydrogeological systems. Physically-based, spatially-distributed groundwater flow and transport models allow representing in a realistic and reliable way the dynamics of regional groundwater systems and processes and accounting for negative or positive feedbacks induced by a changed stress factors or particular measures set up in the basin such as increase in pumping, use of fertilizers or artificial recharge. Such models are complex and their development and implementation are challenging for several reasons related to numerical difficulties but also to data acquisition and management, conceptualization, calibration and validation. Variably-saturated, regional flow and transport models have been developed using two finite element simulators SUFT3D and HydroGeoSphere specifically suited to regional-scale applications. A complex synthetic case has been used as a reference model to test the impact on predictions made and computing times of various conceptual and technical choices such as spatial and time discretization, simplified unsaturated laws or boundary conditions. Real cases have been developed for regional groundwater bodies (from 500 to 1700 km²) to deliver relevant information such as the estimation and evolution with time of groundwater reserves, under different stress conditions such as climate changes and for the evaluation of regional groundwater quality status and nitrate trend assessment under alternative management scenarios and mitigation measures. Results provide guidelines for the conceptualisation, the calibration and the use of regional-scale groundwater flow and transport models for decision making. [less ▲]

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See detailFinite element simulation of canine humeral condylar fractures
D'Otreppe, Vinciane ULg; Böhme, Béatrice; Balligand, Marc ULg et al

Conference (2011, July 04)

Humeral condylar fractures are common in dogs. Different types of fractures (lateral, medial, bicondylar) may occur, depending on the age of the dog and the position of its elbow during the impact. The ... [more ▼]

Humeral condylar fractures are common in dogs. Different types of fractures (lateral, medial, bicondylar) may occur, depending on the age of the dog and the position of its elbow during the impact. The goal of this work is to understand the effects of bone posture and skeletal development on canine humeral fractures by means of the finite element method. Four distinct finite element simulations were performed, corresponding to an immature and a mature dog elbow, respectively in extension and flexion. To create the finite element models, subject-specific finite element meshes were extracted from the CT-data. Appropriate material properties were used for cortical bone, trabecular bone and cartilage. The modified Mohr-Coulomb failure criterion was implemented to take account for strength asymmetry. Lateral humeral fractures are obtained for both the young and adult dog elbow, in extension and flexion. This is in agreement with clinical observations, in which lateral condylar fractures are most common. [less ▲]

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See detailManagers’ competences in social enterprises: what specificities?
Moreau, Charlotte ULg; Mertens de Wilmars, Sybille ULg

Conference (2011, July 04)

In any enterprise, the manager keeps a determining and real leeway which is susceptible to stimulate, give directions to the organization (Pichault, 2009), and is determining in the capability to innovate ... [more ▼]

In any enterprise, the manager keeps a determining and real leeway which is susceptible to stimulate, give directions to the organization (Pichault, 2009), and is determining in the capability to innovate (King, 1990; Osborne, 1998; Schin & McClomb, 1998). That leadership style needs therefore to be adapted to the specific internal context of the organization (Schmid, 2006). The paper examines what are the specific competencies of the manager in social enterprises, by constructing a competencies model, the emblematic tool of the competence-based management, relevant to social enterprises (Collin & Grasser, 2007; Retour & Rapiaux, 2006; Oiry & Sulzer, 2002). Our hypothesis is standing that certain competencies mobilized by managers in social enterprises are specific, regarding to the particular internal and external context of social enterprises, etc. First of all, we propose a theoretical competencies model for the managers in social enterprises, based on a review of the literature and the conduction of 12 semi-structured interviews of experts and managers. Then, we propose a competencies model for the manager in social enterprises. Finally, group interviews with some managers of social enterprises are conducted in various European countries as this research takes place in a European research on long-life learnings. [less ▲]

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See detailSudden crash or long torture: the timing of market reactions to operational loss events
Muller, Aline ULg; Biell, Elizabeth

Conference (2011, July 01)

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See detailDelivering bad news to customers: The role of employee emotional and technical competences
Delcourt, Cécile ULg; Van Riel, Allard ULg; van Birgelen, Marcel et al

Conference (2011, July)

Detailed reference viewed: 40 (7 ULg)
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See detailCurrent challenges in Luminescence dating applied to building archaeology
Guibert, Pierre; Bailiff, Ian; Blain, Sophie ULg et al

Conference (2011, July)

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See detailImplications of tribimaximal lepton mixing for leptogenesis
Aristizabal Sierra, Diego ULg

Conference (2011, July)

In models featuring exact mixing patterns the mass matrices that define the effective light neutrino mass matrix -and the light neutrino matrix itself- are form-diagonalizable. We study leptogenesis in ... [more ▼]

In models featuring exact mixing patterns the mass matrices that define the effective light neutrino mass matrix -and the light neutrino matrix itself- are form-diagonalizable. We study leptogenesis in type I seesaw models in these contexts pointing out that the CP asymmetry in right-handed neutrino decays vanishes as a consequence of the mass matrices being form-diagonalizable. A non-vanishing CP asymmetry arises once deviations from the exact mixing scheme, induced by higher order effective operators, is allowed. Finally we discuss alternative pathways to viable leptogenesis in these kind of models. [less ▲]

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See detailhave/be no need: the interaction between negation and modality in verbonominal pathways of changes
Brems, Lieselotte ULg; davidse, kristin; van linden, an

Conference (2011, July)

We investigate how modal meanings can emerge in nominal patterns, an under-researched source construction for modal meanings. We specifically look at how the combination of the noun need/needs with ... [more ▼]

We investigate how modal meanings can emerge in nominal patterns, an under-researched source construction for modal meanings. We specifically look at how the combination of the noun need/needs with negation markers of various kinds leads to such modal meanings related to the deontic and epistemic domain. [less ▲]

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See detailPara una sociología de las posesiones : El papel de las tecnicas dentro del reconocimiento identaria
Melard, François ULg

Conference (2011, July)

Este coloquio tiene por tema inaugural: “la Ciencia y la tecnologiá para la inclusión social”. Mi contribución va a intentar alimentar nuestra reflexión sobre teoría/ciencia y técnica/democracia (en el ... [more ▼]

Este coloquio tiene por tema inaugural: “la Ciencia y la tecnologiá para la inclusión social”. Mi contribución va a intentar alimentar nuestra reflexión sobre teoría/ciencia y técnica/democracia (en el sentido de la construcción de la ciudadanía). Cómo pensar grupos que no tiene todavía una realitad estabilizada en la sociedad y que se definen por medio de su relación con non-humanos ? Para esto, voy a poner en el centro de mi intervención el papel que pueden jugar las ciencias y las técnicas en la producción de nuevo modos de existencias, pero sobre todo de hacerlo proponiendo un marco teórico ad hoc. En este sentido, se trata aún más de proponer un programa de investigación que de presentar resultados de un análisis. Las cuestiones que lo animan proceden de un campo de investigación en plena extensión: las controversias medioambientales… con sus complejidades y sus urgencias. [less ▲]

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See detailHow many species in the Black rat complex (Rattus rattus sensu lato) in Southeast Asia?
Pagès, Marie ULg; Galan, Maxime; Chaval, Yannick et al

Conference (2011, July)

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no ... [more ▼]

Black rats are among the major invasive vertebrates with severe ecological, economic and health impacts. Remarkably, the evolutionary history of black rats has received little attention and there is no firm agreement as how many species should be recognized within the Rattus rattus complex. Members of the species complex are native from India and Southeast Asia. Current taxonomy suggests that four taxa live in sympatry in several places of Thailand and Cambodia where the present study was conducted: three accepted species (R. tanezumi, R. losea, R. argentiventer) and an additional lineage of unclear taxonomic status sometimes referred as Rattus R3. We used an extensive sampling, morphological data and diverse genetic markers of different evolutionary rates and parental inheritance (two mtDNA genes, one nuclear gene and eight microsatellite loci) to assess the genetic structure among the four taxa. Genetic analyses revealed discordant patterns between the mt and the nuclear data. The mt phylogeny identified three reciprocally monophyletic clades corresponding to the four putative taxa while the nuclear phylogeny failed to separate tanezumi and R3. Within geographic localities, microsatellites revealed free gene flow between tanezumi and R3 but no gene flow between those two taxa and losea or argentiventer. Altogether theses analyses do not support the taxon R3 as a valid species and advocate for synonymy with tanezumi. As a consequence, R. tanezumi becomes paraphyletic with respect to losea. Simulation analyses are now ongoing to determine whether a recent speciation event between tanezumi and losea, or an incomplete lineage sorting within tanezumi could explain this uncommon pattern. [less ▲]

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See detailGlobal multivariate analysis of the plant life history: a reflection about the concept of evolutionary success
Cascales - Miñana, Borja ULg; Cleal, Christopher J.; Diez, José B.

Conference (2011, July)

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See detailAurora : Global features
Gérard, Jean-Claude ULg

Conference (2011, July)

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See detailImmunogenetics as a tool to assess Hantavirus risk in wild rodents
Guivier, Emmanuel; Galan, Maxime; Pagès, Marie ULg et al

Conference (2011, July)

Immunogenetics, the analysis of genetic polymorphisms in specific recognition and immune regulation, is at the core of the study of host-parasite coevolution. We present here a synthesis of our recent ... [more ▼]

Immunogenetics, the analysis of genetic polymorphisms in specific recognition and immune regulation, is at the core of the study of host-parasite coevolution. We present here a synthesis of our recent works based on immune gene polymorphism to illustrate the power of this approach in improving our knowledge of rodent / hantavirus interactions. Two candidate genes (encoding Mx2 protein and β3 integrin) were first investigated at the inter-specific level. Sequence and/or expression polymorphism were compared among twenty murid species, some of them being reservoirs and some others being non reservoirs of hantaviruses. Our results showed that SNPs as well as patterns of selection acting on these genes differed between these rodent species and could mediate their susceptibility to hantaviruses. Four candidate genes (Mx2 gene and three genes from the Major Histocompatibility Complex) were next analyzed among populations of bank voles (Myodes glareolus), the reservoir of Puumala virus (PUUV). We revealed the existence of positive associations between Mhc alleles and PUUV infection in one hand and negative relationships between Tnf-α or Mx2 expression levels and PUUV prevalence in the other hand. These results suggested that tolerance to PUUV could have evolved in endemic areas. Such tolerance could be selected in response to the costs of immune responses that are activated against PUUV. We will conclude on the advantages to combine this immune gene candidate approach with more recent analyses based on genome scan, to deepen our investigation of this intra- and inter-specific variability of rodent tolerance / susceptibility to hantaviruses. [less ▲]

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See detailDe quoi est fait le temps judiciaire? Réflexions provisiores sur la question de l'accélération à partir d'une étude comparative.
Bastard, Benoit; Delvaux, David ULg; Mouhanna, Christian et al

Conference (2011, July)

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See detailRenewable Energy Source Cooperatives (REScoops): Assets, Obstacles and Diffusion Strategies
Huybrechts, Benjamin ULg; Mertens de Wilmars, Sybille ULg

Conference (2011, July)

While the ability of social enterprises to generate innovative solutions to social and environmental needs is increasingly documented (eg., Defourny 2001; Harrisson & Vézina 2006; Nicholls 2006), little ... [more ▼]

While the ability of social enterprises to generate innovative solutions to social and environmental needs is increasingly documented (eg., Defourny 2001; Harrisson & Vézina 2006; Nicholls 2006), little is known about the processes through with social enterprises diffuse and institutionalize their innovations. These processes are important not only to understand institutionalized fields of practice (eg. Bouchard 2006), but also –and even more– to inform the creation of new fields through the diffusion (or „scaling up‟) of social innovations (Maguire et al. 2004; Mulgan et al. 2007). Institutionalization dynamics are at the core of „institutional theory‟, more particularly its recent agency-based developments, commonly grouped under the banner of „institutional entrepreneurship‟ (Battilana et al. 2009) or „institutional work‟ (Lawrence & Suddaby 2006). This approach seems particularly adequate to understand the emergence of new fields through the development of interorganizational collaborations, which enable the diffusion and replication of structures and practices across the field (Lawrence et al. 2002; Phillips et al. 2000). Fields centered on social innovations offer good examples of these dynamics (Mair & Marti 2006), with collaborations observed both among social enterprises pioneering the innovation (Davies 2009) and between social enterprises, governments (eg. Young 2000) and businesses (eg. Di Domenico et al. 2009; Le Ber & Branzei 2010). This paper examines the role of social enterprises in creating and diffusing innovative institutional arrangements in the field of renewable energy sources (RES). While social (ecological) movements have been instrumental in shifting the public attention towards the need for alternative energies (Sine & Lee 2009), the sector has in most countries become dominated by corporate actors experienced in building large-scale RES projects. In an attempt to counter the corporate hegemony and to protect available lands, a range of citizen initiatives have emerged under the term of REScoops (Coen 2010). Although not very numerous, these initiatives seem particularly efficient in terms of greenhouse gas emissions and may reach a large scale at the local level. Moreover, they seem particularly innovative in terms of organizational models, conceived as multi-stakeholder and cooperative schemes involving citizens, municipalities and local economic players. In the contest around new field boundaries and dominance (Santos & Eisenhardt 2009), including recognition by the government, we examine the legitimating strategies of social enterprises in having their organizational arrangements (= social innovations) recognized as a superior avenue to the management of RES (= technological innovation), especially in terms of democracy and participation. [less ▲]

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See detailEnumeration and decidable properties of automatic sequences
Charlier, Emilie ULg

Conference (2011, July)

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See detailMulti‐scale modelling of fibre reinforced composite with non‐local damage variable
Wu, Ling ULg; Noels, Ludovic ULg; Adam, Laurent et al

Conference (2011, July)

Classical finite element simulations face the problems of losing uniqueness and strain localization when the strain softening of materials is involved. Thus, when using continuum damage model or ... [more ▼]

Classical finite element simulations face the problems of losing uniqueness and strain localization when the strain softening of materials is involved. Thus, when using continuum damage model or plasticity softening model, numerical convergence will not be obtained with the refinement of the finite element discretization when strain localization occurs. Gradient-enhanced softening and non-local continua models have been proposed by several researchers in order to solve this problem. In such approaches, the spatial gradients of state variables are incorporated in the macroscopic constitutive equation [1, 2]. However, when dealing with complex heterogeneous materials, a direct simulation of the macroscopic structures is unreachable, motivating the development of non-local homogenization schemes [3]. In our work, a gradient-enhanced homogenization procedure is proposed for fiber reinforced materials. In the approach, the fiber is assumed to remain linear elastic while the matrix material is modeled as elasto-plastic [4] coupled with damage and is described by a non-local constitutive model [5]. Toward this end, the mean-field homogenization is based on the knowledge of the macroscopic deformation tensors, internal variables and their gradients, which are applied to a micro-structural representative volume element (RVE). Macro-stress is then obtained from a homogenization process. This procedure is applied to simulate damage process occurring in unidirectional carbon-fiber reinforced epoxy composites submitted to different loading histories. [less ▲]

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See detailMultidimensional GCxGC Fingerprinting for Environmental and Biological Forensics
Patterson Jr; Sandau; Focant, Jean-François ULg

Conference (2011, July)

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See detailImproving 3D measurements accuracy with camera information redundancy
Schwartz, Cédric ULg; Fringuellini, Anthony ULg; Bruls, Olivier ULg et al

Conference (2011, July)

The accuracy of the Codamotion system for 3D measurement depends mainly on the signal level of the sensors and the resolution of the system at the marker localization. When using several units to cover a ... [more ▼]

The accuracy of the Codamotion system for 3D measurement depends mainly on the signal level of the sensors and the resolution of the system at the marker localization. When using several units to cover a large field of view, the estimated position of the different units might differ. We propose a method taking both resolution and signal level in to account, instead of only the signal level as in the built-in weighting process. This new method offers improved accuracy. [less ▲]

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See detailSignal, perception and plant fossils: how real is our reading through the fossil record?
Cascales - Miñana, Borja ULg; Diez, José B.

Conference (2011, July)

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See detailEnacting political games in organizational transformation projects: panoptic vs polyphonic styles of management
Pichault, François ULg

Conference (2011, July)

Resistance to change and micro-politics around change processes have been studied by many social scientists. In the managerial field, numerous authors plead for the adoption of participative methods in ... [more ▼]

Resistance to change and micro-politics around change processes have been studied by many social scientists. In the managerial field, numerous authors plead for the adoption of participative methods in order to overcome such phenomena but few of them seriously document the way in which the so-called “human factor” may be really taken into consideration in the management of change projects. Is there a direct relation between the managerial ability to cope with power games and the final results of a change project? Does a participatory strategy necessarily lead to a successful change? What are the conditions under which the enactment of micropolitics may contribute to an effective organizational transformation? We will here focus on change processes occurring in the public sphere: the NPM school of thought led to a large range of organizational reforms in which the civil servants’ engagement and motivation appear to play a crucial role. Our research questions will be discussed through the presentation of two cases studies of Belgian public organizations concerned with the implementation of an electronic document management system (DMS). The first case is located in the Federal Police department while the second occurs in a regional administration. Both are issued from action-researches undertaken with my research team during the last decade. They have been selected in order to contrast the different ways in which power games and end-users resistances may be enacted by senior management. They will help us to distinguish two management styles and to explore their respective impact on the change process itself. [less ▲]

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See detailAcoustic comfort of air-treatment systems: influence of factors related to room acoustics
Minard, Antoine; Goujard, Bertrand; Sakout, Anas et al

Conference (2011, June 30)

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See detailOn the use of gender-marked personal pronouns: towards a semantic system
De Vos, Lien ULg

Conference (2011, June 30)

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See detailInterface element for delamination simulation. A good usage for accuracy and performances.
Delsemme, Jean-Pierre; Bruyneel, Michaël ULg; Jetteur, Philippe et al

Conference (2011, June 29)

This paper deals with the use of interface element for the simulation of crack propagation. The questions: "how to choose mesh size, material properties and model parameters in order to get a correct ... [more ▼]

This paper deals with the use of interface element for the simulation of crack propagation. The questions: "how to choose mesh size, material properties and model parameters in order to get a correct result in a reasonable time" will be discussed. An industrial test case with skin-stringer separation will also be presented. [less ▲]

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See detailDeleuze on the revival of Bergson’s élan vital
Wong, Tai Tak Andy ULg

Conference (2011, June 28)

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See detailLie antialgebras
Kreusch, Marie ULg

Conference (2011, June 28)

Lie antialgebras which is a $\Z_2$-graded commutative algebra (but not associative) was introduced in 2007 by Valentin Ovsienko. This notion takes place in the superspaces theory studied since years in ... [more ▼]

Lie antialgebras which is a $\Z_2$-graded commutative algebra (but not associative) was introduced in 2007 by Valentin Ovsienko. This notion takes place in the superspaces theory studied since years in geometry. This algebra was discovered in the context of symplectic geometry. In a way, Lie antialgebras unify in a special meaning associative and commutative algebras. Since this is quite a new subject a lot of things have to be done in the understanding of this structure. At first, I am going to explain the notion of superspaces. Then I will speak about the origins of this structure and present what has already been discovered about this new 'type' of algebra (universal algebra, representations, modules, relation to superalgebra,...). After, I am going to give some important examples of Lie antialgebras related to some known structures. Finally, I am going to present what I am searching for the moment and the questions that I am trying to answer. [less ▲]

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See detailPMMA/carbon nanotube nanocomposites foams for EMI shielding application
Thomassin, Jean-Michel ULg; Molenberg, Isabel; Huynen, Isabelle et al

Conference (2011, June 27)

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See detailControl of hypertension in renal transplantation : the EPARA study
Gellner, Karen; SAINT-REMY, Annie ULg; WEEKERS, Laurent ULg et al

Conference (2011, June 26)

Blood pressure (BP) is a cardiovascular but also kidney disease risk factor, especially in high risk populations such as kidney transplantated one (KT). Therefore it must be accurately measured. The aim ... [more ▼]

Blood pressure (BP) is a cardiovascular but also kidney disease risk factor, especially in high risk populations such as kidney transplantated one (KT). Therefore it must be accurately measured. The aim of the current study was to evaluate the quality of BP control in such a population followed at the CHU Liège. [less ▲]

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See detailEmotion et psychiatrie, ou les chances de l'homme selon Francis Jeanson
Cormann, Grégory ULg

Conference (2011, June 25)

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See detailNative vitamin D in dialysis patients : safety and biological effects
WEEKERS, Laurent ULg; Warling, Xavier; Moonen, Martial et al

Conference (2011, June 25)

Native vitamine D (VTD) supplementation is recommended by the last KDIGO guidelines in CKD patients including dialysis patients. However, this recommendation is based on a low level of evidence. We ... [more ▼]

Native vitamine D (VTD) supplementation is recommended by the last KDIGO guidelines in CKD patients including dialysis patients. However, this recommendation is based on a low level of evidence. We designed a randomized double-blind prospective study comparing the effects of VTD and placebo in dialysis patients on mortality, vascular calcifications and different paremeters: 25-OH vitamine D- 25(OH)D -, parathormone (PTH), calcium and phosphorus. [less ▲]

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See detailJudicial Independence Conference
Sibony, Anne-Lise ULg

Conference (2011, June 24)

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See detailQuels horizons pour les répertoires de manuels scolaires ?
Jadoulle, Jean-Louis ULg

Conference (2011, June 24)

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See detailA plus d'un titre. Généalogie critique de la reine Albemarle
Cormann, Grégory ULg

Conference (2011, June 24)

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See detailThe Parametrized Diastolic Filling Formalism: Application in the Asklepios Population
Claessens, Tom; Waheed Raja, Muhammad; Pironet, Antoine ULg et al

Conference (2011, June 24)

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See detailThe alpha of a market timer
Hübner, Georges ULg

Conference (2011, June 23)

The Treynor and Mazuy framework is a widely used return-based model of market timing, but existing corrections of the regression intercept can be manipulated through derivatives trading. We propose an ... [more ▼]

The Treynor and Mazuy framework is a widely used return-based model of market timing, but existing corrections of the regression intercept can be manipulated through derivatives trading. We propose an adjustment based on Merton's option replication approach. The linear and quadratic coefficients of the regression are exploited to assess the cost of the replicating option that yields similar convexity for a passive portfolio. A similar reasoning applies for various timing patterns and in multi-factor models. Our empirical application shows that, unlike existing performance adjustment methods, the portfolio replication approach uncovers a positive link between the convexity and the performance of market timing funds. [less ▲]

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See detailWhat can we learn about strongly lensed quasars with microlensing ?
Sluse, Dominique ULg

Conference (2011, June 23)

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See detailInfluence de la vitesse de refroidissement sur le profil de contraintes résiduelles dans la céramique d’émaillage : mesures avec la méthode du trou incrémental
MAINJOT, Amélie ULg; Schajer, Gary; VAN HEUSDEN, Alain ULg et al

Conference (2011, June 23)

INTRODUCTION : La fabrication des couronnes et des bridges génère des contraintes résiduelles dans la céramique d’émaillage et dans l’infrastructure lors du procédé de refroidissement. Les contraintes ... [more ▼]

INTRODUCTION : La fabrication des couronnes et des bridges génère des contraintes résiduelles dans la céramique d’émaillage et dans l’infrastructure lors du procédé de refroidissement. Les contraintes résiduelles sont un facteur important qui contrôle le comportement mécanique des restaurations. La connaissance de la distribution des contraintes en fonction de la profondeur peut aider à comprendre les échecs, particulièrement le chipping, qui est une problématique répandue avec les prothèses à infrastructure en zircone yttrium. L’objectif de cette étude est d’analyser la variation du profil de contraintes dans la céramique d’émaillage sur infrastructure métal ou zircone, en fonction de la vitesse de refroidissement. METHODES : La méthode du trou incrémental, souvent utilisée en ingénierie industrielle, a été adaptée à pour être utilisée au niveau de la céramique d’émaillage 1. Le profil de contraintes a été mesuré dans des des disques de 20 mm de diamètre, comprenant une infrastructure de 0.7 mm d’épaisseur en métal ou en zircone yttrium, et une couche de céramique d’émaillage de 1.5 mm d’épaisseur. Trois procédures de refroidissement différentes ont été étudiées. RESULTATS: Il a été observé que l’amplitude des contraintes mesurées en surface de la céramique d’émaillage augmente avec la vitesse de refroidissement, alors que l’amplitude des contraintes en profondeur diminue. Des contraintes en compression ont été mesurées à la surface de tous les échantillons. En profondeur, des contraintes en compression ont été mesurées au niveau des échantillons à infrastructure métal et des contraintes en traction au niveau des échantillons à infrastructure zircone. DISCUSSION ET CONCLUSIONS : La vitesse de refroidissement influence l’amplitude des contraintes résiduelles. Celles-ci peuvent influencer le comportement mécanique des bicouches à infrastructure métal et zircone. La nature du matériau d’infrastructure influence la nature des contraintes en profondeur, les échantillons zircone montrant un profil de contraintes beaucoup plus défavorable que les échantillons métal. L’hypothèse de la transformation de phase de la zircone est mise en avant pour expliquer ce comportement. REFERENCES : ¬¬¬¬¬¬¬1 Mainjot, A., et al. (2011) Dental Materials 27 : 437-444. Fig 1 Profil de contraintes dans l’émaillage des échantillons zircone. CC= Classic Cooling, MC= Modified Cooling, SC= Slow Cooling. [less ▲]

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See detailDevelopment and validation of situational judgment tests for evaluating Organizational Citizenship Behavior and Contextual Performance Behavior in a professional context : methodological issues.
Lothe, Benoit ULg; Hansez, Isabelle ULg

Conference (2011, June 22)

Strategic Human Resource Management typically raises appraisal issues (Analoui, 2007; Jackson, Schuler & Werner, 2009 ; Teo & Crawford, 2005) mostly related to the HRM relationship with organizational ... [more ▼]

Strategic Human Resource Management typically raises appraisal issues (Analoui, 2007; Jackson, Schuler & Werner, 2009 ; Teo & Crawford, 2005) mostly related to the HRM relationship with organizational performance (Bowen & Ostroff, 2004 ; Cascio, 1996 ; Wright, Gardner, Moynihan & Allen, 2005). Hence workforce assessment remains a key success factor for many organizations. Thus this paper takes place in the early beginning of a PhD Thesis which aims to the development and validation of an assessment test of Organizational Citizenship Behavior (OCB) and Contextual Performance (CP) in a professional selection context. The managerial concept of OCB refers to “individual behavior that is discretionary, not directly or explicitly recognized by the formal reward system, and in the aggregate promotes the efficient and effective functioning of the organization” (Organ, Podsakoff & MacKenzie, 2006, p. 3). CP is a closely related construct, distinct of task performance, that encompasses behaviors supporting the psychological and social context in which task activities are performed (Stone-Romero, Alvarez, & Thompson, 2009). If these two frameworks look much alike, they contrast on several points: conceptual dimensions, discretional characteristics of behavior, etc. Therefore, it seems interesting to apprehend both commonly. Situational Judgment Tests (SJTs) show a good validity concerning prediction of job performance in employment settings (Lievens, Peeters, Schollaert, 2008 ; Whetzel & McDaniel, 2009). Furthermore, they are a multidimentional measurement method suited to assess different construct like job knowlege and skills, applied social skills, and some basic personality tendencies (Christian, Edwards, & Bradley, 2010). Taking into account its characteristics, SJTs seem to be an appropriate method to enable OCB & CP evaluation. This communication pursues three goals. The first is a theoretical issue: we need a straightforward vision of OCB & CP concepts. Accordingly, after a consistent review on the vast amount of work that have been written on these two concepts, we have to specify what we seek to appraise and make the inventory of existing measurement tools related to these focus. We have already worked out a structured methodology to develop and validate SJTs in selection and career management context (Lothe, Hansez & Bertrand, Submitted). So the second issue is a methodological one. How to improve and/or to adapt this methodology in order to create a new SJT measuring OCB & CP ? Thirdly, some research related issues conclude this paper. Through this PhD project, we should be able to examine several main issues that will shape the thesis. Are SJTs being able to provide a valid assessment of OCB & CP in a personnel selection context ? Does the discretionary nature of one behavior impact the quality of its measurement ? What is the effect of response instructions on OCB/CP situational judgment test performance ? Each issue will be illustrated and discussed in connection with the development and validation opportunities and constraints. [less ▲]

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See detailAttraction of wireworms to root-emitted volatile organic compounds of barley
Barsics, Fanny ULg; Haubruge, Eric ULg; Verheggen, François ULg

Conference (2011, June 20)

The ability of wireworms (Agriotes sordidus Illiger) to orientate towards a blend of volatiles emitted by chopped roots of barley was tested. During individual tests, the larvae chose between the two ... [more ▼]

The ability of wireworms (Agriotes sordidus Illiger) to orientate towards a blend of volatiles emitted by chopped roots of barley was tested. During individual tests, the larvae chose between the two sides of a Y-shaped olfactometer. One side was connected to a chamber containing the chopped roots and the other was connected to an empty chamber. Wireworms chose significantly more often the side of the olfactometer providing the blend of root volatiles. This result underlines the importance of the identification of these compounds and their role assessment alone or combined, as for their effect on wireworms. Such compounds could be used in IPM strategies. [less ▲]

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See detailLie antialgebras
Kreusch, Marie ULg

Conference (2011, June 20)

Lie antialgebras which is a $\Z_2$-graded commutative algebra (but not associative) was introduced in 2007 by Valentin Ovsienko. This notion takes place in the superspaces theory studied since years in ... [more ▼]

Lie antialgebras which is a $\Z_2$-graded commutative algebra (but not associative) was introduced in 2007 by Valentin Ovsienko. This notion takes place in the superspaces theory studied since years in geometry. This algebra was discovered in the context of symplectic geometry. In a way, Lie antialgebras unify in a special meaning associative and commutative algebras with Lie algebras. Since this is quite a new subject a lot of things have to be done in the understanding of this structure. At first, I am going to explain the notion of superspaces and in particular the one of Lie superalgebras and give some important examples. After I am going to introduce the topic of Lie antialgebras and also give some examples. And finally I am going to give a links between them (Lie antilagebra and Lie superalgebra). If I have time, I will probably speak a bit about extensions and relations with 2-cocycles in the cohomology theory. That's what I am interested in for the moment. [less ▲]

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See detailPaleoearthquakes from Turbidites in the SISCOR project
Beck, Christian; Hubert, Aurelia ULg

Conference (2011, June 20)

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See detailLong-term biogeochemical effects of adding alkalinity into the ocean
Ilyina, Tatiana; Wolf-Gladrow, Dieter; Munhoven, Guy ULg et al

Conference (2011, June 20)

Large-scale perturbations in seawater chemistry brought about by the oceanic uptake of anthropogenic CO2 will go on long after emissions decline or stop. Several geo-engineering approaches have been ... [more ▼]

Large-scale perturbations in seawater chemistry brought about by the oceanic uptake of anthropogenic CO2 will go on long after emissions decline or stop. Several geo-engineering approaches have been suggested to reduce atmospheric CO2 concentrations and ocean acidification. One of them is to enhance weathering processes to remove atmospheric CO2. This method involves dissolving rocks (i.e. limestone, olivine) or adding strong bases (i.e. calcium hydroxide) to the upper ocean. The net effect of these two approaches is to increase ocean alkalinity, thereby increasing the oceanic capacity to take up and store anthropogenic CO2. Another effect of adding alkalinity would be to drive seawater to higher pH values and thus counteract the ongoing ocean acidification. However, whereas adding bases initially only alters alkalinity of seawater, dissolution of carbonates perturbs both, alkalinity and dissolved inorganic carbon budgets. Thus, on longer time scales, these two methods will likely have different biogeochemical effects in the ocean. Here we test enduring implications of the two approaches for the marine carbon cycle using the global ocean biogeochemical model HAMOCC which also includes marine sediments. In our model scenarios we add alkalinity in amounts proportional to fossil fuel emissions. We compare the long-term effectiveness of the two geo-engineering approaches to decrease atmospheric CO2. [less ▲]

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See detailThe use of Eco-Exergy in Oceanology: Application to Posidonia oceanica meadows
Pete, Dorothée ULg; Velimirov, Branko; Gobert, Sylvie ULg

Conference (2011, June 17)

In classic thermodynamics, exergy is defined as the useful work a system can perform when brought into equilibrium with its environment. It represents a measure of the distance from thermodynamic ... [more ▼]

In classic thermodynamics, exergy is defined as the useful work a system can perform when brought into equilibrium with its environment. It represents a measure of the distance from thermodynamic equilibrium. From that definition, some researchers (S.E. Jørgensen) have decided to apply this theory to ecosystems and called this expression of exergy “Eco-exergy”. According to this theory, a developing ecosytem trends to go far from its thermodynamic equilibrium and its exergy content trends to increase. Thus, the Laboratory of Oceanology of the University of Liege has decided to apply this quite new theory to Posidonia oceanica meadows, an endemic ecosystem of the Mediterranean coastal zone. This ecosystem is known as a good environmental quality indicator. So it was choosen to test the relevance of eco-exergy index as a quality indicator in the Mediterranean Sea. As this ecosystem is complex, this study focuses on the sedimentary compartment and the microbenthic loop (organic matter, bacteria, microphytobenthos and meiofauna). Some estimations of this eco-exergy index in the sedimentary compartment of a P. oceanica meadow are presented here. According to them, it seems that the eco-exergy index is not sensitive enough to catch effects of perturbations in this ecosystem. [less ▲]

Detailed reference viewed: 33 (7 ULg)