Browsing
     by title


0-9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

or enter first few letters:   
OK
Full Text
Peer Reviewed
See detailImproving The Catabolic Functions Of Desiccation-Tolerant Soil Bacteria
Weekers, F.; Jacques, Philippe ULg; Springael, D. et al

in Applied Biochemistry and Biotechnology (1999), 77-9

Detailed reference viewed: 6 (0 ULg)
Full Text
Peer Reviewed
See detailImproving the description of proton-induced one-nucleon removal in intranuclear-cascade models
Boudard, Alain; Carbonell, Jaume; Cugnon, Joseph ULg et al

in Physical Review. C : Nuclear Physics (2015), 91

Detailed reference viewed: 10 (0 ULg)
Peer Reviewed
See detailImproving the Energy Efficiency of the Building Stock: A Bottom-up Model and its Application in an Online Interactive Portal
Cuvellier, Simon; Marique, Anne-Françoise ULg; Reiter, Sigrid ULg

in Proceedings of PLEA 2014 (2014)

There is an urgent need to reduce energy uses in new and retrofitted buildings. In Europe, energy consumption in the building sector still represents more than 40% of the final energy use. Emerging ... [more ▼]

There is an urgent need to reduce energy uses in new and retrofitted buildings. In Europe, energy consumption in the building sector still represents more than 40% of the final energy use. Emerging countries are also concerned by such issues at even wider levels because of the huge demographic growth they are witnessing. Numerous research studies have highlighted the need to produce more efficient buildings, but also to retrofit the existing building stock. However, research methods and tools that allow a precise quantification of energy uses in buildings and energy savings related to various actions (insulating the roofs, changing the glazing, behavioral changes, etc.) are mainly dedicated to trained professional users, thus neglecting the huge potential energy savings that is linked to individual actions undertaken by citizens in their dwellings. In this context, the main aim of our research is to raise awareness of energy efficiency in residential buildings and encourage positive changes to the energy efficiency of the building stock, starting at the individual scale. This paper first presents the methodology that allows a precise energy assessment (heating, cooling, ventilation, lighting, appliances and cooking) of buildings (at the house, neighborhood, city and region scales) on the basis of a “bottom-up” approach. This methodology uses a typological classification of buildings, thermal simulations and local surveys. In this paper, this methodology is applied to the Walloon (Belgium) building stock. Many parameters are defined and taken into account to capture the specificities of numerous types of buildings (e.g., the number of floors, common ownership, orientation, thermal performances, ventilation, etc.). Several occupation modes are modelled to capture the impact of occupants’ behavior on energy consumption. To take into account the impact of urban form, correction factors are defined and applied according to the type of neighborhoods in which the buildings are located. All things considered, 250,000 individual results are obtained and stored in a huge database. Linear extrapolations and correction factors are used to extrapolate and apply these results to any type of residential building in Wallonia. This methodology is then used to develop an online portal that aims to strengthen citizens’ awareness of the necessity for ecological changes in the building sector and encourage individual actions to improve the energy efficiency of buildings. This tool allows for a transfer of the main results of a two-year scientific research effort to citizens in a very simple and intuitive way. Although the results presented in this paper are focused on Wallonia (Belgium), the research is easily reproducible to other territories by adapting local parameters. [less ▲]

Detailed reference viewed: 15 (4 ULg)
Full Text
See detailImproving the grinding performance in ball mills with a conductive and inductive sensor
Köttgen, Axel ULg; de Haas, Bernard; Keshav, Pratish et al

Poster (2010)

A series of tests were conducted in a South African concentrator on the secondary grinding mill. The results were analysed and provided showed the importance of selecting an optimum density and filling ... [more ▼]

A series of tests were conducted in a South African concentrator on the secondary grinding mill. The results were analysed and provided showed the importance of selecting an optimum density and filling degree of the mill. Moreover, a Sensomag (r) is installed on this mill and the surveys showed that an increase of the density was improving the mixing of balls in the pulp and increasing the grinding performance. [less ▲]

Detailed reference viewed: 133 (21 ULg)
Full Text
Peer Reviewed
See detailImproving the performance of low-gain designs for bounded control of linear systems
Grognard, F.; Sepulchre, Rodolphe ULg; Bastin, G.

in Automatica (2002), 38(11), 1777-1782

Detailed reference viewed: 8 (0 ULg)
Full Text
See detailImproving the performance of μ-ORC systems
Declaye, Sébastien ULg

Doctoral thesis (2015)

This thesis contributes to the knowledge and the characterization of micro Organic Rankine Cycles (ORC). It is based on experimental data and simulation models. An oil-free scroll expander is tested in a ... [more ▼]

This thesis contributes to the knowledge and the characterization of micro Organic Rankine Cycles (ORC). It is based on experimental data and simulation models. An oil-free scroll expander is tested in a wide range of operating conditions in order to better characterize its performance. Particular attention is paid to the tightness of the machine which is obtained using a magnetic coupling. The measured isentropic efficiency reaches 75% which is higher than typical values reported in the literature. From the experimental results, a performance map of the expander is generated. This performance map can be used to provide fast and accurate calculation of the volumetric and isentropic performance of the expander in a wide range of operating conditions. Five displacement pumps adapted to μ-ORC systems are also tested. These pumps are diaphragm, piston, plunger and gear types. The measured values include the overall efficiency, the volumetric efficiency and the NPSH. A deep analysis of the performance is performed to quantify the losses of each pump, of their electric motor and of their frequency drive. This analysis shows that the weakness of the overall effectiveness (max. 46%) of the pumps tested is mainly due to the low efficiency of the electric motor. A semi-empirical model of the diaphragm pump is proposed and validated based on manufacturer data. This model can predict the mechanical power of the pump and the flow delivered with a good accuracy. The simulation models developed for the expander and the pump are used to simulate a configuration including the pump, the generator and the expander on a single shaft. This configuration aims to avoid the use of a motor and a frequency drive whose performance is poor in the range of power consumed by the pump of a μ-ORC system. The results show a significant increase in the net power produced using the integrated configuration Finally, performance of a prototype of μ-ORC suitable for recovering heat from a two-stage screw compressor are measured and analyzed. The prototype allows generating maximum 3.9% of the electrical power consumed by the compressor. Several optimization options of the prototype are evaluated numerically, showing that the power generation could be increased up to 5.4% of the compressor consumption. These options include using the integrated configuration and optimizing the intercooler boiler design. [less ▲]

Detailed reference viewed: 84 (5 ULg)
Full Text
Peer Reviewed
See detailImproving the power of out of control states detection in multivariate processes using variable sampling intervals policy
Seif, A.; Faraz, Alireza ULg; Torabian, M.

in Journal of Applied Mathematics (2009), 23

The familiar multivariate process monitoring and control procedure is the Hotelling’s T2 control chart, a direct analog of the univariate shewhart chart. But, its efficiency for detecting small to ... [more ▼]

The familiar multivariate process monitoring and control procedure is the Hotelling’s T2 control chart, a direct analog of the univariate shewhart chart. But, its efficiency for detecting small to moderate shifts in the process mean is poor. To improve the power of chart, this paper presents the variable sampling intervals (VSI) scheme. It is assumed that the length of time the process remains in control has exponential distribution. The chart is modeled using Markov chains and is optimized using genetic algorithm optimization method. The results show that the T2 chart with variable ratio sampling scheme is quicker than the classical one in detecting almost all shifts in the process mean [less ▲]

Detailed reference viewed: 24 (4 ULg)
Full Text
Peer Reviewed
See detailImproving the seismic robustness of reinforced concrete frames by using locally hybrid steel-concrete columns
Degée, Hervé ULg; Plumier, André ULg

in Proceedings of the STESSA 2009 Conference (2009)

The proposed concept consists in placing a steel profile with limited size inside the reinforced concrete column of the first level of the building. This profile is not considered for the design and is ... [more ▼]

The proposed concept consists in placing a steel profile with limited size inside the reinforced concrete column of the first level of the building. This profile is not considered for the design and is essen-tially assumed to act as a safety belt activated only in case of deficiencies of the concrete under earthquake action, providing thus the requested robustness and limiting the risk of soft-storey mechanisms even in the most unfavorable conditions. Theoretical, experimental and numerical investigations summarized in the pre-sent contribution are aiming at demonstrating the efficiency of the concept. [less ▲]

Detailed reference viewed: 81 (4 ULg)
Full Text
Peer Reviewed
See detailImproving the statement of the corrective security-constrained optimal power flow problem
Capitanescu, Florin ULg; Wehenkel, Louis ULg

in IEEE Transactions on Power Systems (2007), 22(2), 887-889

This letter proposes a formulation of the corrective security-constrained optimal power-flow problem imposing, in addition to the classical post-contingency constraints, existence and viability ... [more ▼]

This letter proposes a formulation of the corrective security-constrained optimal power-flow problem imposing, in addition to the classical post-contingency constraints, existence and viability constraints on the short-term equilibrium reached just after contingency. The rationale for doing so is discussed and supported by two examples. [less ▲]

Detailed reference viewed: 42 (2 ULg)
Full Text
Peer Reviewed
See detailImproving the sunlight-to-biomass conversion efficiency in microalgal biofactories
Wobbe, Lutz; Remacle, Claire ULg

in Journal of Biotechnology (2015), 201

Detailed reference viewed: 23 (2 ULg)
Peer Reviewed
See detailImproving training in problem solving skills : Analysis of anesthesists' performance in simulated problem situations
Nyssen, Anne-Sophie ULg; De Keyser, Véronique ULg

in Travail Humain (Le) (1998), 61(4), 387-401

Using a full scale anesthesia simulator, we compare and analyze the responses of anesthesia trainees (second and third year trainees and fourth and fifth year trainees) to 4 simulated problem situations ... [more ▼]

Using a full scale anesthesia simulator, we compare and analyze the responses of anesthesia trainees (second and third year trainees and fourth and fifth year trainees) to 4 simulated problem situations that are very close to a real-world situation in order to establish relationship between these analyses and the contents of medical training cursus. Data were collected from systematic observations and videotaping of simulation sessions and self-confrontation. Several quantitative and qualitative variables were used to compare the performance of subjects: accuracy and speed of diagnosis, type of behaviors, identification and selectivity of diagnostic indices, hypotheses generated, type of reasoning. [less ▲]

Detailed reference viewed: 53 (5 ULg)
Full Text
See detailImpuissance érectile: Symptôme aspécifique
Mormont, Christian ULg

in Feuillets Psychiatriques de Liège (1980), 13(1), 5-11

L'impuissance érectile est souvent considérée comme un symptôme simple et banal. Pourtant, il apparaît très vite que la plus grande incertitude plane sur la nature et l'efficacité des facteurs ... [more ▼]

L'impuissance érectile est souvent considérée comme un symptôme simple et banal. Pourtant, il apparaît très vite que la plus grande incertitude plane sur la nature et l'efficacité des facteurs étiologiques supposés. La méconnaissance de certains facteurs, leur multiplicité, les interactions complexes qui les unissent, l'aspécificité du symptôme ne permettent guère d'aboutir à une conviction raisonnable. Ce problème se pose également sur le plan organique et sur le plan psychique. En fait, il semblerait que chacune des diverses théories explicatives soit adéquate dans des cas particuliers mais qu'aucune ne soit généralisable, contrairement à ce que beaucoup d'auteurs et praticiens font. [less ▲]

Detailed reference viewed: 24 (1 ULg)
Full Text
See detailL'impuissance érective: Approche descriptive et pronostique au moyen du Rorschach
Mormont, Christian ULg

in Cahiers de Sexologie Clinique (1985), 11(65), 349-353

Detailed reference viewed: 8 (1 ULg)
Full Text
See detailL'impuissance érective: Aspects psychologiques
Mormont, Christian ULg

in Revue Médicale de Liège (1979, September), 34(17), 712-714

Detailed reference viewed: 6 (1 ULg)