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See detailImplementation of structured metal packing for the design of biofilm reactor : analysis by high energy X-ray tomography and application to the production of lipopeptides by Bacillus subtilis
Zune, Quentin ULg; Soyeurt, Delphine; Ongena, Marc ULg et al

Poster (2012, October 08)

1. Whereas multi-species biofilm reactors are commonly used for treatments of water and gas effluents, new strategies are arising for the development of mono-species biofilm reactors in order to produce ... [more ▼]

1. Whereas multi-species biofilm reactors are commonly used for treatments of water and gas effluents, new strategies are arising for the development of mono-species biofilm reactors in order to produce high added value molecules. Thus, it is required to design new bioreactors able to promote the growth of the biomass on the form of a biofilm and to identify the key physico-chemical parameters involved in order to optimize the bioprocess. 2. Aim of this study was to investigate a pilot-scale biofilm reactor comprising a metal structured packing promoting growth of Bacillus subtilis as a biofilm for the production of lipopeptides, high added value compounds with high surface active properties. 3. In this work, the mechanical stirring system of a 20L stirred tank bioreactor has been removed and replaced by a metal structured packing positioned in the headspace of the vessel above a liquid phase. The culture medium is continuously recirculated on the packing thanks to a peristaltic pump and air supply is performed just above the liquid phase under the packing. High energy X-ray tomography was used to estimate non-invasively the biofilm distribution inside the packing and permitted to define parameters that affect scale-up. Performances of the biofilm reactor were compared with a submerged culture in a stirred tank reactor in terms of lipopeptides production. 4. After 72 hours of fermentation, 94 % of the total biomass adheres onto the metal packing on the form of a biofilm. The colonization of this latter has been visualized non-invasively by X-ray tomography directly inside the packing and shows a conical repartition of the biofilm mass (about 25% of the total volume of the packing) as well as the presence of clogging. However, unlike the submerged culture, no foam formation appeared during fermentation and surfactin yield reaches 345,4 ± 32,8 mg / L for the biofilm reactor against 277,3 ± 34,4 mg / L in the stirred tank reactor. 5. In conclusion, this experimental setting leads to a major technological progress avoiding foam formation and increasing surfactin production. Nevertheless, significant improvements are required at the level of the biofilm distribution in thin layers inside the packing in order to increase mass transfer and lipopeptides recoveries. Further investigations will be devoted to the optimization of the physico-chemical parameters involved in biofilm distribution. [less ▲]

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See detailImplementation of the ALERT algorithm, a new dispatcher-assisted telephone cardiopulmonary resuscitation protocol, in non-Advanced Medical Priority Dispatch System (AMPDS) Emergency Medical Services centres.
STIPULANTE, Samuel ULg; Tubes, Rebecca; Fassi, Mehdi El et al

in Resuscitation (2014), 85(2), 177-181

Objectives: Early bystander cardiopulmonary resuscitation (CPR) is a key factor in improving survival from out-of-hospital cardiac arrest (OHCA). The ALERT (Algorithme Liegeois d'Encadrement a la ... [more ▼]

Objectives: Early bystander cardiopulmonary resuscitation (CPR) is a key factor in improving survival from out-of-hospital cardiac arrest (OHCA). The ALERT (Algorithme Liegeois d'Encadrement a la Reanimation par Telephone) algorithm has the potential to help bystanders initiate CPR. This study evaluates the effectiveness of the implementation of this protocol in a non-Advanced Medical Priority Dispatch System area. Methods: We designed a before and after study based on a 3-month retrospective assessment of victims of OHCA in 2009, before the implementation of the ALERT protocol in Liege emergency medical communication centre (EMCC), and the prospective evaluation of the same 3 months in 2011, immediately after the implementation. Results: At the moment of the call, dispatchers were able to identify 233 OHCA in the first period and 235 in the second. Victims were predominantly male (59%, both periods), with mean ages of 64.1 and 63.9 years, respectively. In 2009, only 9.9% victims benefited from bystander CPR, this increased to 22.5% in 2011 (p<0.0002). The main reasons for protocol under-utilisation were: assistance not offered by the dispatcher (42,3%), caller physically remote from the victim (20.6%). Median time from call to first compression, defined here as no flow time, was 253sec in 2009 and 168sec in 2011 (NS). Ten victims were admitted to hospital after ROSC in 2009 and 13 in 2011 (p=0.09). Conclusion: From the beginning and despite its under-utilisation, the ALERT protocol significantly improved the number of patients in whom bystander CPR was attempted. [less ▲]

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See detailImplementation of the finite element method for non-lambertian indoor surfaces
Embrechts, Jean-Jacques ULg

in Proceedings of the 7th "Lux Europa" congress (Edinburgh 1993) - Volume 2 (1993)

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See detailImplementation of the finite element method for non-lambertian indoor surfaces
Embrechts, Jean-Jacques ULg

in Proceedings of the C.I.E. Seminar on Computer Programs for Light and Lighting (1992)

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See detailAn implementation of the generalized Maxwell viscoelastic constitutive model
Careglio, Claudio; Canales Cardenas, Cristian ULg; Papeleux, Luc ULg et al

in Bertolino, Graciela; Cantero, Mariano; Storti, Mario (Eds.) et al Mecánica Computacional Vol XXXIII (2014)

Viscoelastic problems deserve great interest in Computational Mechanics literature. In the last years different approaches have been proposed in order to model viscoelastic problems, as in the case of the ... [more ▼]

Viscoelastic problems deserve great interest in Computational Mechanics literature. In the last years different approaches have been proposed in order to model viscoelastic problems, as in the case of the generalized Maxwell model and its numerical implementation. In particular Kaliske and Rothert (M. Kaliske and H. Rothert, Comput. Mech., 19(3): 228-239 (1997)) discussed basic reological models and the formulation of a generalized Maxwell model and the corresponding implementation of three dimensional viscoelastic model both for small and large strain cases. The numerical implementation addressed by Kaliske and Rothert is quite simple for small strain case and can be extended to a large strain format amenable to be included in finite element codes SOGDE and Metafor. The implementation of the discussed model in a 1D constitutive model, written in Matlab, is addressed. The well known relaxation and creep tests are simulated and compared with analytical results. Furthermore, the influence of constitutive parameters on the viscoelastic response is discussed. In addition, the model is implemented in Finite Element codes and the obtained results are compared with the 1D ones. [less ▲]

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See detailImplementation of the harmonic balance FEM method for large-scale saturated electromagnetic devices
Driesen, Johan; Deliège, Geoffrey ULg; Van Craenenbroeck, Thierry et al

in Software for Electrical Engineering - Analysis and Design IV (1999)

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See detailImplementation of the hypothesis testing identification method
Mili, Lamine; Van Cutsem, Thierry ULg

in IEEE Transactions on Power Systems (1988), 3

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See detailImplementation of the Multifractal Formalism on Snu Spaces
Kleyntssens, Thomas ULg; Nicolay, Samuel ULg

Conference (2013, September 09)

A multifractal formalism is a formula, numerically computable, which approximate the spectrum of singularities of a function. The first multifractal formalism (Frisch and Parisi, 1985) has the main ... [more ▼]

A multifractal formalism is a formula, numerically computable, which approximate the spectrum of singularities of a function. The first multifractal formalism (Frisch and Parisi, 1985) has the main default is that it always leads to a concave spectrum. In 2004, Stéphane Jaffard has introduced a new multifractal formalism, based on the Snu spaces, which can detect non concave spectra. In practice, one has to avoid the concept of limit and to deal with finite size effects. In this talk, I present the first results of an implementation of the multifractal formalism on Snu spaces on several theoretical functions. [less ▲]

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See detailImplementation of the Nitrate Directive in Belgium : the Agricultural Surface Survey
Vandenberghe, Christophe ULg; Bontemps, Pierre-Yves; Lambert, Richard et al

in Schröder, J. J.; Neeteson (Eds.) N management in agrosystems in relation to the Water Framework Directive (2005)

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See detailImplemented psychomotor activity for very pre-term children aged from 18 to 36 months
Jidovtseff, Boris ULg; DUTILLEUX, Benjamine ULg; IGLESIAS-GIL, Laura ULg et al

in Science et sports (2014, October), 29(Hors-série 1), 22

Premature infants are more susceptible to motor development impairment when compared to full term infants. From this perspective a psychomotor program has been implemented for very-term children aged from ... [more ▼]

Premature infants are more susceptible to motor development impairment when compared to full term infants. From this perspective a psychomotor program has been implemented for very-term children aged from 18 to 36 month. [less ▲]

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See detailImplementing a National Routine Genetic Evaluation for Milk Fat Compositions as First Step Towards Genomic Predictions
Gengler, Nicolas ULg; Troch, Thibault ULg; Vanderick, Sylvie ULg et al

in Interbull Bulletin (2012), 46

Currently the Walloon Region of Belgium is one of the first regions in the World where mid-infra red (MIR) spectral data is recorded in routine for nearly all cows under milk recording. Based on this data ... [more ▼]

Currently the Walloon Region of Belgium is one of the first regions in the World where mid-infra red (MIR) spectral data is recorded in routine for nearly all cows under milk recording. Based on this data, in some herds collected since 2007, saturated (SFA) and monounsaturated fatty acid (MUFA) contents in milk are predicted for each test-day. Together with correlated traits as milk, fat and protein yields, estimated breeding values (EBV) are now computed in routine for SFA and MUFA starting in June 2012. A total of 499 821, 392 255, 277 465 fatty acid records were available in first, second and third lactation for this run. A restricted selection index, called NQI (nutritional quality index) was developed that puts a negative weight on SFA, a positive weight on MUFA and restricts changes in milk and fat yields to zero. By using this index for a constant fat content, milk fat will be selected to be less saturated with a high contribution from MUFA. Based on this system a single-step genomic evaluation is under development including the introduction of MACE breeding values for correlated traits. The final step is to offer for owners of genotyped animals, a service to provide them with genomically enhanced NQI. Similar systems are under development in Wallonia for other novel traits (e.g., methane emissions) based on the ability to predict them from MIR spectral data. [less ▲]

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See detailImplementing a National Routine Genetic Evaluation for Milk Fat Compositions as First Step Towards Genomic Predictions
Gengler, Nicolas ULg; Troch, Thibault ULg; Vanderick, Sylvie ULg et al

Conference (2012, May)

Currently the Walloon Region of Belgium is one of the first regions in the World where mid-infra red (MIR) spectral data is recorded in routine for nearly all cows under milk recording. Based on this data ... [more ▼]

Currently the Walloon Region of Belgium is one of the first regions in the World where mid-infra red (MIR) spectral data is recorded in routine for nearly all cows under milk recording. Based on this data, in some herds collected since 2007, saturated (SFA) and monounsaturated fatty acid (MUFA) contents in milk are predicted for each test-day. Together with correlated traits as milk, fat and protein yields, estimated breeding values (EBV) are now computed in routine for SFA and MUFA starting in June 2012. A total of 499 821, 392 255, 277 465 fatty acid records were available in first, second and third lactation for this run. A restricted selection index, called NQI (nutritional quality index) was developed that puts a negative weight on SFA, a positive weight on MUFA and restricts changes in milk and fat yields to zero. By using this index for a constant fat content, milk fat will be selected to be less saturated with a high contribution from MUFA. Based on this system a single-step genomic evaluation is under development including the introduction of MACE breeding values for correlated traits. The final step is to offer for owners of genotyped animals, a service to provide them with genomically enhanced NQI. Similar systems are under development in Wallonia for other novel traits (e.g., methane emissions) based on the ability to predict them from MIR spectral data. [less ▲]

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See detailImplementing agricultural land-use in the CARAIB dynamic vegetation model
François, Louis ULg; Jacquemin, Ingrid ULg; Fontaine, Corentin et al

Conference (2014)

CARAIB (Dury et al., iForest - Biogeosciences and Forestry, 4:82-99, 2011) is a state-of-the-art dynamic vegetation model with various modules dealing with (i) soil hydrology, (ii) photosynthesis/stomatal ... [more ▼]

CARAIB (Dury et al., iForest - Biogeosciences and Forestry, 4:82-99, 2011) is a state-of-the-art dynamic vegetation model with various modules dealing with (i) soil hydrology, (ii) photosynthesis/stomatal regulation, (iii) carbon allocation and biomass growth, (iv) litter/soil carbon dynamics, (v) vegetation cover dynamics, (vi) seed dispersal, and (vii) vegetation fires. Climate and atmospheric CO2 are the primary inputs. The model calculates all major water and CO2/carbon fluxes and pools. It can be run with plant functional types or species (up to 100 different species) at various spatial scales, from the municipality to country or continental levels. Within the VOTES project (Fontaine et al., Journal of Land Use Science, 2013, DOI:10.1080/1747423X.2013.786150), the model has been improved to include crops and meadows, and some modules have been written to translate model outputs into quantitative indicators of ecosystem services (e.g., evaluate crop yield from net primary productivity or calculate soil erosion from runoff, slope, grown species and various soil attributes). The model was run over an area covering four municipalities in central Belgium, where land-use is dominated by crops, meadows, housing and some forests and was introduced in the model at the land parcel level. Simulations were also performed for the future. In these simulations, CARAIB was combined with the Aporia Agent-Based Model, to project land-use changes up to 2050. This approach is currently extended within the MASC project (funded by Belgian Science Policy, BELSPO) to the whole Belgian territory (at 1 km2) and to Western Europe (at 20 km x 20 km). [less ▲]

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See detailImplementing Human Rights in Benin: The Case of Inheritance Disputes
Andreetta, Sophie ULg

in Journal of Human Rights Practice (2014)

On 14 June 2004, Benin ratified a new Code on Persons and Family, adapting its previous dual legal system to the requirements of international human rights law. For the purpose of this article, I chose to ... [more ▼]

On 14 June 2004, Benin ratified a new Code on Persons and Family, adapting its previous dual legal system to the requirements of international human rights law. For the purpose of this article, I chose to focus on inheritance conflicts as a back door to questioning the implementation of a law directly inspired by international human rights standards and principles. When it comes to inheritance disputes, are human rights respected in Benin? What are the discourses of the judges, the lawyers, and the notaries regarding this new Code? How is it implemented and what are the obstacles to it? Combining both qualitative interviews with family members and participant observation in the courtrooms, I compiled a series of case studies, supplemented by interviews with judicial officials. These sets of data allowed me to grasp how laws are enforced and interpreted, and how citizens deal with their families and with the justice system. [less ▲]

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See detailImplementing Network Virtualization for a Future Internet
Papadimitriou, Panagiotis; Maennel, Olaf; Greenhalgh, Adam et al

in 20th ITC Specialist Seminar on Network Virtualization Proceedings (2009, May)

The Internet has become an essential communication medium upon which billions of people rely every day. However, necessary evolution of the Internet has been severely limited by reliability constrains and ... [more ▼]

The Internet has become an essential communication medium upon which billions of people rely every day. However, necessary evolution of the Internet has been severely limited by reliability constrains and social-economic factors. Experts fear that current growth rates will threaten the future of the Internet as a whole, despite the fact that new core technologies already exist. Network virtualization presents a promising approach to overcome ossification and facilitate service deployment for a future Internet. Exploring this approach, we present a prototype implementation which realizes a subset of the 4WARD virtual network (VNet) architecture, allowing multiple VNets to coexist on top of a shared physical infrastructure. We discuss the functionality of our prototype and demonstrate experimental results to assess its performance. [less ▲]

Detailed reference viewed: 13 (1 ULg)