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See detailPerformance assessment of a 5 kW SOFC cogeneration fuel cell
Lerson, sébastien; Lilien, Jean-Louis ULg; Minne, Gael

in International Journal of Environmental Technology & Management (2008), 9(4), 426-433

A 5 kW SOFC (Solid Oxyde Fuel Cell) performance will be detailed. This kind of cogeneration, a typical one for residential application, will be able to replace actual boiler in most of applications. The ... [more ▼]

A 5 kW SOFC (Solid Oxyde Fuel Cell) performance will be detailed. This kind of cogeneration, a typical one for residential application, will be able to replace actual boiler in most of applications. The combination of high temperature hot water output combined with grid-tie electricity delivery will progressively replace actual systems. This will help to significantly reduce GHG (green house gas) emission to about 20% , even compared to actual emissions, based on high performance boiler and electricity produced by high efficiency combined cycle. The particular benefit of SOFC compared to other technologies of fuel cell is the high temperature from one side (giving access to appropriate hot water for heating purposes) and the very exciting high electricity efficiency which is over 40%, together with a global efficiency measured over 80%. This paper is analysing an existing 5 kW unit SOFC which has shown such high level efficiencies [less ▲]

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See detailPerformance assessment of a small-scale adsorption chiller integrated to an already existing solar heating system
Thomas, Sébastien ULg; Andre, Philippe ULg; Maas, Stefan

in Proceedings of 4th International Conference Solar Air-Conditioning (2011, October 12)

In the context of the solar air-conditioning systems analysis, it is crucial to assess system performance by experimentations in real-time conditions. In this way, it is possible to calculate the energy ... [more ▼]

In the context of the solar air-conditioning systems analysis, it is crucial to assess system performance by experimentations in real-time conditions. In this way, it is possible to calculate the energy savings to minimize environmental impact and CO2 production induced by the operation of such a system in buildings operation. It is proposed to measure the thermal behaviour and the energy performance of a smallscale solar air-conditioning system used to cool a laboratory building in the South of Belgium. The experimental system is recently installed and fully instrumented for both thermal and electrical COP computation. Results of two months operation and data analysis are presented in this work. [less ▲]

Detailed reference viewed: 72 (8 ULg)
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See detailPerformance Assessment of Local Mobility Policy-Making Administrations Using the Principles of Total Quality Management in Flanders, Belgium: Expounding the Decision-Making Processes
Tormans, Hans; Miermans, Willy; Cools, Mario ULg et al

in International Journal of Sustainable Transportation (2013), 7(4), 318-346

This article describes a quality assessment of the processes underlying municipal mobility policy-making in Flanders, Belgium. 25 criteria and 176 aspects were queried during 25 interview sessions ... [more ▼]

This article describes a quality assessment of the processes underlying municipal mobility policy-making in Flanders, Belgium. 25 criteria and 176 aspects were queried during 25 interview sessions. Results were aggregated at the level of 7 quality domains of action and suggest that Flemish municipal mobility policy-making is generally fairly frail and of an ad-hoc nature. Four factors are found to be determining for this finding: default of political continuity, internal conflicts between stakeholders, lacking internal expertise, and deficient financial resources. Inter-stakeholder collaboration, residents’ participation, and policy-integration with higher-level programs are the strengths of current mobility policy practices in Flanders. [less ▲]

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See detailPerformance assessment of the FAO AquaCrop model for irrigated cabbage on farmer plots in a semi-arid environment
Wellens, Joost ULg; Raes, Dirk; Traore, Farid et al

in Agricultural Water Management (2013), 127

Small-scale irrigation initiatives are expanding rapidly in Burkina Faso. However, in many cases optimal yields are not being obtained despite the available water and the required nutrient applications ... [more ▼]

Small-scale irrigation initiatives are expanding rapidly in Burkina Faso. However, in many cases optimal yields are not being obtained despite the available water and the required nutrient applications. Local stakeholders need an easy-to-use decision-support tool to assess irrigation water use and its impact on yield. In this study, a water-driven crop model, AquaCrop, developed by FAO, was adapted for cabbage (Brassica oleracea L.) using a limited dataset and leave-one-out cross-validation (LOOCV). The experiment was conducted in south-western Burkina Faso on small irrigated farmer plots, where optimal managerial conditions could not always be guaranteed. Statistical indicators – normalized root mean square error (nRMSE) and index of agreement (d) – suggested that the model is very reliable for simulating cabbage biomass yield and soil water content (low nRMSE and d-index near 1). The relationship between observed and simulated yield produced a d-index of 0.99 and an nRMSE of 1.39% (or 0.59 ton/ha). The comparison between observed and modeled soil water content gave a d-index of 0.90 and an nRMSE of 4.38% (or 9.13 mm). Also of interest was the indirect link between plant density and yield via maximum canopy cover, which can considerably simplify yield estimation. It was concluded that AquaCrop was a very useful tool for enabling local end-users to evaluate and optimize cabbage yield and irrigation water use. [less ▲]

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See detailPerformance Budgeting, Motivation and Incentives
Paul, Elisabeth ULg; Robinson, Marc

in Robinson, Marc (Ed.) Performance Budgeting: Linking Funding and Results (2007)

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See detailPerformance characteristics of mill rolls from graphite chromium cast iron
Lecomte-Beckers, Jacqueline ULg; Terziev, L.; Breyer, J. P.

in Stal' (2000), 1

The main requirements for the development of a new grade for the later finishing section of the mill are : good oxidation and thermal behaviour, high wear resistance, good resistance to rolling incidents ... [more ▼]

The main requirements for the development of a new grade for the later finishing section of the mill are : good oxidation and thermal behaviour, high wear resistance, good resistance to rolling incidents. The approach of Marichal Ketin to improve the rolling performances in the last finishing stands is presented. The Hi-Cr cast iron possesses excellent wear resistance due to the presence of hard chromium carbides, but its thermal conductivity and sticking properties are fairly low. A graphite precipitation could contribute to an improvement in thermal conductivity and serve as lubricant preventing sticking. The new material, called graphitic chromium iron, shows good oxidation, wear and thermal behaviour allowing its use as work roll in the last stands of the finishing section of a HSM. In the as-cast condition, graphite precipitation in high Ni and Si chromium cast iron occurs at a temperature of 950 degrees C. Moreover, the amount and volume of free graphite may be increased by secondary graphite precipitation during suitable heat treatment. [less ▲]

Detailed reference viewed: 43 (9 ULg)
See detailPerformance characteristics of the CK-MB and myoglobin assays on the opus magnum system
Chapelle, Jean-Paul ULg; Spronck, T.; Ferir, A. M. et al

Poster (1995, November)

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See detailPerformance comparison between JWST/MIRI+NIRCam & VLT/SPHERE for exoplanet detection
Hanot, Charles ULg

Scientific conference (2010, February)

Performance comparison between JWST/MIRI and VLT/SPHERE for exoplanet detection Charles Hanot, Olivier Absil, Anthony Boccaletti, Céline Cavarroc, Jean Surdej In the context of exoplanet detection, a ... [more ▼]

Performance comparison between JWST/MIRI and VLT/SPHERE for exoplanet detection Charles Hanot, Olivier Absil, Anthony Boccaletti, Céline Cavarroc, Jean Surdej In the context of exoplanet detection, a large majority of the 400 detected exoplanets have been found by indirect methods. Today, progress in the field of high contrast imaging has allowed direct images of several exoplanetary systems to be taken (cf. HR 8799, Fomalhaut). In the near future, several new instruments are going to dramatically improve our sensitivity to exoplanet detection. Among these, SPHERE ( Spectro Polarimetric High contrast Exoplanet REsearch ) at the VLT and MIRI ( Mid Infra-Red Instrument) onboard JWST will both be equipped with coronagraphs to reveal faint objects in the vicinity of nearby stars. In this paper, we make use of the most recent evolutionary models of young (sub-)stellar objects and exoplanets to derive their luminosities in order to compare the sensitivity of SPHERE to that of MIRI. From this comparison, we present a catalogue of targets which are particularly well suited for MIRI with possible detections of planets down to (sub-)Saturn masses. [less ▲]

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See detailPerformance comparison of four kinds of flat nonimaging Fresnel lenses made of polycarbonates and polymethyl methacrylate for concentrated photovoltaics
Languy, Fabian ULg; Habraken, Serge ULg

in Optics Letters (2011), 36(14), 2743-2745

Solar concentrators made of a single refractive primary optics are limited to a concentration ratio of about 1000× [Opt. Express19, A280 (2011)OPEXFF1094-408710.1364/OE.19.00A280], due only to ... [more ▼]

Solar concentrators made of a single refractive primary optics are limited to a concentration ratio of about 1000× [Opt. Express19, A280 (2011)OPEXFF1094-408710.1364/OE.19.00A280], due only to longitudinal chromatic aberration, while mirrors are limited to ∼46,000× by the angular size of the Sun. To reduce the chromatic aberration while keeping cost-effective systems for concentrated photovoltaics, a study of four different kinds of flat Fresnel doublets made of polycarbonates and polymethyl methacrylate is presented. It reveals that Fresnel doublets may have fewer optical losses than non-Fresnel doublets, with a lower lateral chromatic split allowing for even higher concentration ratio. [less ▲]

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See detailPerformance comparison of heating control strategies combining simulation and experimental results.
Kummert, M.; Andre, Philippe ULg; Argiriou, A.

(2005, August)

Different heating system controllers for passive solar buildings are compared on two different buildings. The performance criterion combines energy performance and thermal comfort using the "cost function ... [more ▼]

Different heating system controllers for passive solar buildings are compared on two different buildings. The performance criterion combines energy performance and thermal comfort using the "cost function" paradigm. The experimental facilities did not allow a direct experimental comparison by using two identical buildings. The controllers were implemented alternatively in one building and a performance comparison was obtained in two ways: first by identifying short periods that have similar driving variables (weather conditions and building occupancy) and comparing the experimental results obtained in both cases. The second method mixes experiments and simulation using a well-tuned model of the building and its occupants. This paper discusses the results obtained using the above methods and shows that both methods give consistent estimates of the difference between controllers, while the second method allows to extrapolate useful information from the limited data available. [less ▲]

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See detailPerformance Comparison of Hydronic Secondary Loop Heat Pump and Conventional Air-Source Heat Pump
Bell, Ian ULg; Braun, James

in International Refrigeration and Air Conditioning Conference at Purdue, July 16-19, 2012 (2012, July)

In residential heat pump systems, the motivation for secondary loop systems is to allow for the use of flammable or toxic refrigerants with lower global warming potentials than the currently employed HFC ... [more ▼]

In residential heat pump systems, the motivation for secondary loop systems is to allow for the use of flammable or toxic refrigerants with lower global warming potentials than the currently employed HFC refrigerants. The addition of radiant panels as integral building components (embedded in concrete at construction) is becoming more common. Combining the large surface area of the radiant panel and an efficient primary loop, the hydronic secondary loop heat pump system can greatly outperform the conventional air-to-air heat pump. The improvement in coefficient of performance is as much as 38% over the conventional air-to-air heat pump when the secondary loop hydronic system is employed. Due to the large area of the radiant panel, the condensing temperature of the primary loop for the hydronic secondary loop heat pump can be reduced by as much as 5°C at high ambient temperatures. [less ▲]

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See detailPerformance comparison of Multifactor Dimensionality Reduction: JVM vs. Native code
Chaichoompu, Kridsadakorn ULg; Kittitornkun, Surin; Tongsima, Sissades

in ITC-CSCC: International Technical Conference on Circuits Systems, Computers and Communications. 2006 (2006)

Multifactor Dimensionality Reduction (MDR) was originally developed to detect gene-gene interactions in the domain of human genetics. MDR algorithm collapses high-dimensional genetic data, into a single ... [more ▼]

Multifactor Dimensionality Reduction (MDR) was originally developed to detect gene-gene interactions in the domain of human genetics. MDR algorithm collapses high-dimensional genetic data, into a single dimension thus permitting interactions to be detected in relatively small sample sizes. To deal with the large volume of data, we demonstrate the experiment of MDR software which was written in Java programming language and compare with native method. We focus on execution time, memory usage and CPU usage and describe the results. [less ▲]

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See detailPerformance de Acacia Auriculiformis (Cunn. A.) dans le système agroforestier au Sud-Bénin
Fonton, H. N.; Claustriaux, Jean-Jacques ULg; Agbahungba, G.

in Annales des Sciences Agronomiques du Bénin (2002), 3(1), 65-79

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See detailLa performance de l'entreprise sociale : définitions et limites d'une évaluation monétaire
Mertens de Wilmars, Sybille ULg; Marée, Michel ULg

in Revue Internationale P.M.E. (2012), 25(3-4), 91-122

In a social enterprise, the notion of "performance" must be understood in a broader sense than the sole financial profitability. Because enterprises of this type pursue a social mission, whose completion ... [more ▼]

In a social enterprise, the notion of "performance" must be understood in a broader sense than the sole financial profitability. Because enterprises of this type pursue a social mission, whose completion generates collective impacts, one has to go beyond what is made possible by the sole market-based indicators. This requires to revise not only the very notion of production, but also the way in which the value of what is produced by the enterprise is measured. This is the task that the authors of the present article tackle, through building a definition of performance understood as "enlarged production" – a notion which they nevertheless define with accuracy. Whenever the notion of production is enlarged so as to take into account the impacts of the latter, the question of whether this approach is also operational unavoidably arises. In particular, one must ask oneself whether the impacts that one wants to include in an enlarged conception of production are measurable. By nature, these impacts are not taken into account by the market and measuring them sends back to the classical question of the evaluation of non-market goods. The authors draw up an inventory of the various techniques of monetary evaluation of the value of non-market goods and indicate whether these techniques are likely to lead to values that are relevant to evaluate the performance of a social enterprise. They illustrate their analysis by applying this grid of analysis to the methodology of social return on investment (SROI). Because of the theoretical limits of monetary evaluation, the authors conclude that works on performance evaluation based on multi-criteria analyses must be further pursued. [less ▲]

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See detailLa performance de l’Etat-providence européen. Quel enseignement pour la Belgique?
Lefebvre, Mathieu ULg; Perelman, Sergio ULg; Pestieau, Pierre ULg

in Regards Economiques (2011), 93

Dans ce numéro de Regards économiques, nous présentons une mesure multidimensionnelle de la performance des Etats- providence de l’Union européenne. Cette mesure permet de comparer la performance des pays ... [more ▼]

Dans ce numéro de Regards économiques, nous présentons une mesure multidimensionnelle de la performance des Etats- providence de l’Union européenne. Cette mesure permet de comparer la performance des pays de l’Europe des 15 avec celle des 12 nouveaux membres; elle donne aussi la possibilité de tester l’hypothèse d’un éventuel dumping social; enfin elle peut être utilisée pour mieux appréhender la performance de la protection sociale de la Belgique et de ses composantes régionales. [less ▲]

Detailed reference viewed: 65 (7 ULg)
See detailPerformance de Portefeuille
Bodson, Laurent ULg; Grandin, Pascal; Hübner, Georges ULg et al

Book published by Pearson - 2ème éd. (2010)

Detailed reference viewed: 113 (16 ULg)
See detailPerformance de portefeuille
Lambert, Marie ULg; Hübner, Georges ULg; Grandin, Pascal

Book published by Pearson Education (2006)

Detailed reference viewed: 40 (0 ULg)
See detailLa performance des entreprises publiques. Une question de propriété ou de concurrence?
Gathon, Henry-Jean ULg; Pestieau, Pierre ULg

in Bouin, Olivier; Morrisson, Christian (Eds.) Les prvatisations: Un état des lieux (1996)

Detailed reference viewed: 22 (1 ULg)