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See detailOptimizing red sorghum malt quality when Bacillus subtilis is used during steeping to control mold growth
Bwanganga Tawaba, Jean-Claude ULg; Bera, François ULg; Thonart, Philippe ULg

in Journal of the Institute of Brewing (2012), 118(3), 295-305

Previous work having shown that Bacillus-subtilis-S499-based biocontrol treatments applied without aeration at the steeping stage of red sorghum malting offered good mould reduction but yielded malts with ... [more ▼]

Previous work having shown that Bacillus-subtilis-S499-based biocontrol treatments applied without aeration at the steeping stage of red sorghum malting offered good mould reduction but yielded malts with low levels of key hydrolytic enzymes, we attempted to raise these levels by aerating the steeping liquor, varying the steeping time (from 8 to 40 h) and temperature (from 25 to 35°C), and combining a biocontrol treatment with prior steeping in 0.2% NaOH. Aeration proved particularly important whenever B. subtilis cells were present in the steep liquor. The optimal temperatures for α- and β-amylase were 30 and 25°C, respectively. By increasing the steeping time it was possible to improve the α-amylase activity, but the -amylase activity peaked sharply between 16 and 20 h, depending on the steeping medium. A good compromise was steeping in biocontrol medium for 14 to 16 h at 30°C. Combination steeping treatments (0.2% NaOH for 8 h followed by biocontrol for 8 h) yielded malts of a quality approaching that afforded by dilute alkaline treatment. [less ▲]

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See detailOptimizing scale search in species distribution models
Serckx, Adeline ULg; Huynen, Marie-Claude ULg; Beudels-Jamar, Roseline et al

in Folia Primatologica : International Journal of Primatology = Internationale Zeitschrift für Primatologie = Journal international de Primatologie (2013), 84

The influence of spatial scale on ecological processes and pattern formation, such as species distribution is a major research topic since decades. It has become even more relevant in the context of ... [more ▼]

The influence of spatial scale on ecological processes and pattern formation, such as species distribution is a major research topic since decades. It has become even more relevant in the context of global change. In many studies the influence of a predictor on a response derived over multiple and discrete spatial scales is evaluated. Due to inherent issue of multiple testing, this approach can be problematic. In this study on bonobos distribution, we suggest a 3-steps procedure that overcomes this problem. It takes into account the decay of a predictor by using a weighting function of distance to the observation of interest. We use variables to account for human pressure, food availability, patchy structure of the forest and nesting sites re-use. In a first step, we run a model with a fixed scale for every predictor based on expert opinion. For significant variables, we derive then in a second step the distance weighted influence over a range of scales. This helps to narrow down the search for the final model parameter estimates. Findings indicate that bonobo distribution is driven on the intermediate scale by forest patches structure. Food availability explains their abundance only at smaller scales. Those results demonstrate the sadly well-known influence of habitat fragmentation on animals’ density and distribution but also highlight the importance to understand influences of scale, the animal perceptions of their environment, by using appropriate statistical procedures. Our method can be particularly useful to formulate specific management hypotheses for conservation. Furthermore, its principles can be of use to other types of studies, such as behavior. [less ▲]

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See detailOptimizing team members communication skills in radiation therapy : content and feasibility of a Belgian Interuniversity Curriculum
Caps, E.; Libert, Y.; Marchal, S. et al

in Psycho-oncology (2009, June), 18 (Suppl. 2)

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See detailOptimizing the geometrical accuracy of 2D curvilinear finite element meshes
Remacle, Jean-François; Lambrechts, Jonathan; Toulorge, Thomas et al

Conference (2014, June 27)

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See detailOptimizing the implementation of policy measures through social acceptance segmentation
Cools, Mario ULg; Brijs, Kris; Tormans, Hans et al

in Transport Policy (2012), 22

This paper proposes Q-methodology as a technique for the identification of more homogeneous subgroups or ‘segments’ within a rather heterogeneous overall population when it comes to social acceptance of ... [more ▼]

This paper proposes Q-methodology as a technique for the identification of more homogeneous subgroups or ‘segments’ within a rather heterogeneous overall population when it comes to social acceptance of demand-restricting policy measures. Identification of such segments would allow policy makers to better tailor their future actions and thereby increase the chance for a successful implementation of the measures they propose. A set of 33 persons, selected in function of age, gender and car ownership evaluated the acceptability of a total number of 42 demand-restricting policy measures. Special care was taken that the final set of statements covered the four classically distinguished demand-restricting strategies, i.e., improved transport options, incentives for the use of alternative transport modes, parking and land-use management, and institutional policy revision. In addition, a balance between both ‘hard’ and ‘soft’ and ‘push’ and ‘pull’ measures was strived for. The results indicate that four different segments in terms of social acceptance of demand-restricting policy measures can be distinguished, i.e., travelers in favor of traffic calming, travelers against hard push measures, travelers in favor of demand restriction, and travelers against policy innovations. Besides the differences and similarities between these segments, the practical implications for policy makers are discussed, together with a series of specific recommendations and suggestions for future research. [less ▲]

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See detailOptimizing The Micro-Environment In A Tissue Engineering Scaffold: A Computational Approach
Van Oosterwyck, Hans; Truscello, S.; Demol, J. et al

in proceedings of the Materialise World Conference (2010)

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See detailOptimizing the ordering policy in a supply chain
Arda, Yasemin ULg; Hennet, Jean-Claude

in INCOM 04, 11th IFAC Symposium on Information Control Problems in Manufacturing, Salvador, Brazil, 5-7 April 2004 (2004, May 05)

This study analyzes an inventory management problem within a supply chain. An enterprise whose stock is replenished by outside suppliers faces random demands for one of its products. The objective is to ... [more ▼]

This study analyzes an inventory management problem within a supply chain. An enterprise whose stock is replenished by outside suppliers faces random demands for one of its products. The objective is to minimize the expected total cost for the enterprise, which includes the holding and shortage costs. The enterprise must choose the suppliers to whom the orders are sent while minimizing the costs. If the enterprise sends all the orders to the same supplier during the planning period, the supplier who has the maximum service rate must be chosen. In the case of choosing possibly different suppliers for different orders, the supplying system is modelled as an open queuing network and explicit expressions are obtained for the average total cost as a function of the decision variables. Numerical results measure the advantage for the producer to use different suppliers instead of a single one. [less ▲]

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See detailOptimizing the PML in the discrete context
Modave, Axel ULg

Scientific conference (2012, March 30)

Perfectly Matched Layers (PML) are widely used for the simulation of unbounded wave-like problems. However their performance depends critically on both an absorption coefficient and the spatial ... [more ▼]

Perfectly Matched Layers (PML) are widely used for the simulation of unbounded wave-like problems. However their performance depends critically on both an absorption coefficient and the spatial discretization. Tuning the coefficient requires a costly (and case-dependent) optimization procedures... so that in most applications it is set empirically. In this talk we discuss the influence of the absorption coefficient on the PML performance for time-domain simulations, in both continuous and discrete contexts. We present efficient coefficients that allow to avoid any tuning in discrete contexts, and compare those with other frequent choices by means of benchmarks solved with both finite differences and finite elements (continuous and discontinuous). A realistic 3D discontinuous Galerkin benchmark for Maxwell's equations will highlight the advantages of our approach. [less ▲]

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See detailOptimizing the treatment of Paget’s disease of bone
Reginster, Jean-Yves ULg; Gennari, C; Hosking, DJ et al

in Revue du Rhumatisme (English ed.) (1997), 64(4), 207-209

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See detailOptimizing treatment with thioguanine derivatives in inflammatory bowel disease.
Louis, Edouard ULg; Belaiche, Jacques ULg

in Bailliere's Best Practice & Research. Clinical Gastroenterology (2003), 17(1), 37-46

Thioguanine derivatives, azathioprine and 6-mercaptopurine, represent major drugs in the treatment of chronic active inflammatory bowel disease. They are effective in two-thirds of the patients and safe ... [more ▼]

Thioguanine derivatives, azathioprine and 6-mercaptopurine, represent major drugs in the treatment of chronic active inflammatory bowel disease. They are effective in two-thirds of the patients and safe over the long term in patients who can tolerate them (80-90%). Recent progress in understanding the metabolism of these drugs and its implication in clinical practice have brought up new tools and strategies that are proposed to optimize treatment. In particular, the measurement and characterization of key enzymes and metabolites may have clinical impact. Thus, thiopurine methyl transferase genotyping and activity measurement, as well as erythrocytes, 6-thioguanine nucleotides and 6-methyl mercaptopurine levels, may help in some situations of intolerance or inefficacy with these drugs. Indications for starting and stopping treatment with thioguanine derivatives are also discussed. [less ▲]

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See detailOptimum Complexity of Marine Ecosystem Models
Dauby, Patrick ULg; Nihoul, Jacques

Conference (1998, November)

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See detailOptimum design of a high speed ferry-passengers catamaran vessel taking into account operational criteria and cost
Marchal, Jean ULg; Grosjean, P.; Rodriguez, S.

in Proceedings of the Third International Conference on Fast Sea Transportation (1995, September), volume 1

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See detailOptimum design of low-cost housing in developing countries using nonsmooth simulation-based optimization
Nguyen, Anh Tuan ULg; Reiter, Sigrid ULg

in Proceedings of the 28th International PLEA Conference (2012, November 07)

An optimum design of Low-cost housing (LCH) offers low-income urban inhabitants great opportunities to obtain a shelter at affordable price and acceptable indoor thermal conditions. In the present study ... [more ▼]

An optimum design of Low-cost housing (LCH) offers low-income urban inhabitants great opportunities to obtain a shelter at affordable price and acceptable indoor thermal conditions. In the present study, the design and operation of a low cost dwelling were numerically optimized using simulation-based approach in which a dynamic building simulation program (EnergyPlus) was coupled with the optimization engine (GenOpt). Three multi-objective cost functions which include construction cost, indoor thermal comfort and 50-year operating cost were applied for naturally ventilated (NV) and air-conditioned (AC) buildings. Optimization problem which consists of 18 building parameters combined with 6 ventilation strategies was examined by two population-based optimization algorithms (Particle Swarm optimization and Hybrid algorithm) to find optimum combinations among these variables. The results show that the design requirements of NV and AC dwellings are not quite similar, and in a few categories, even contradictory. Optimum design corresponding to each cost function was outlined. Results of this paper also show great potential of optimization in comfort improvement, energy saving, life cycle cost, up to 40%. [less ▲]

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See detailAn optimum PML for scattering problems in the time domain
Modave, Axel ULg; Delhez, Eric ULg; Kameni, Abelin et al

in Proceedings of the 7th European Conference on Numerical Methods in Electromagnetism (NUMELEC 2012) (2012, July 05)

The Perfectly Matched Layer (PML) is widely used for unbounded problems. However its performances depend critically on an absorption coefficient. This coefficient is generally tuned by using case ... [more ▼]

The Perfectly Matched Layer (PML) is widely used for unbounded problems. However its performances depend critically on an absorption coefficient. This coefficient is generally tuned by using case-dependent optimization procedures. In this paper we will present some efficient profiles of the coefficient that overcome every tuning. These profiles and others will be compared by using a scattering benchmark solved with the Discontinuous Galerkin method. [less ▲]

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See detailAn optimum PML for scattering problems in the time domain
Modave, Axel ULg; Kameni, Abelin; Lambrechts, Jonathan et al

in European Physical Journal : Applied physics (2013), 64(2), 24502

In electromagnetic compatibility, scattering problems are defined in an infinite spatial domain, while numerical techniques such as finite element methods require a computational domain that is bounded ... [more ▼]

In electromagnetic compatibility, scattering problems are defined in an infinite spatial domain, while numerical techniques such as finite element methods require a computational domain that is bounded. The perfectly matched layer (PML) is widely used to simulate the truncation of the computational domain. However, its performance depends critically on an absorption function. This function is generally tuned by using case-dependent optimization procedures. In this paper, we will present some efficient functions that overcome any tuning. They will be compared using a realistic scattering benchmark solved with the Discontinuous Galerkin method. [less ▲]

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See detailOptimum weather forecasting for DLR : requirements
Nguyen, Huu-Minh ULg; Schell, Peter

Conference (2012, November 27)

The goal of the meeting was 1) to identify the research topics within weather forecasting (days) that need to be addressed to allow for an effective & reliable forecast of DLR and 2) to deter-mine the DLR ... [more ▼]

The goal of the meeting was 1) to identify the research topics within weather forecasting (days) that need to be addressed to allow for an effective & reliable forecast of DLR and 2) to deter-mine the DLR potential based on historical weather data, for planning DLR installations. Developing methods and tools to be able to determine the potential for DLR for specific loca-tions based on historical data and weather models would allow TSO/DSO to make much better decisions on where they could/should implement DLR to solve congestion and curtailment issues in their network. Increasing line electrical capacity on borders can mitigate market pres-sure and lower average generation prices thus increasing welfare. The aim of the WG3-DLR is to come up with a project proposal for these 2 topics that in-cludes: • A description of the obtainable results • An estimation of the R&D tasks required to attain these results • The timing and budget these tasks require Based on these project proposals and depending on their exact content, the proposals are in-tended to be used to either • Convince Transmission/Distribution Network Operators to fund the research for their own immediate needs, • Submit a proposal for EU funding of this research as follow-up to the currently running FP7 Twenties project, • Prepare a potential contribution to Cigré which should be presented at the Cigré B2 meeting due to take place in September in Auckland, NZ. [less ▲]

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See detailL’option de loi et les binationaux: peut-on dépasser le conflit de nationalités?
Wautelet, Patrick ULg

in Revue Générale de Droit Civil Belge = Tijdschrift voor Belgisch Burgerlijk (2012), (9), 466-482

What is the scope of the choice of law offered to parties in various family relationships (such as divorce, matrimonial contracts or alimony) when the person(s) concerned possess several nationalities  ... [more ▼]

What is the scope of the choice of law offered to parties in various family relationships (such as divorce, matrimonial contracts or alimony) when the person(s) concerned possess several nationalities ? In several jurisdictions and under rules of European private international law, parties may select which law will apply to their relationship. In most cases a choice may be made for the law of the nationality of the persons concerned. The question arises how such choice should be handled when the person concerned possesses several nationalities. After reviewing several possible readings, I suggest that the classical rules dealing with multiples nationalities should not be applied when the conflict of laws rules allow a party to select the applicable law. The paper (written in French) has been published in Revue générale de droit civil belge/Tijdschrift voor Belgisch burgerlijk recht (ISSN : 0775-2814) vol. 26 (2012/9), pp. 414-430 [less ▲]

Detailed reference viewed: 51 (3 ULg)