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
Peer Reviewed
See detailDyBa2Cu3O7-x growth on different polycrystalline Dy2O3 interacting layers
Auguste, F.; Vandewalle, Nicolas ULg; Ausloos, Marcel ULg et al

in Materials Letters (1999), 40(2), 71-77

We have considered two types of interacting substrates for testing the melt-textured growth of DyBa2Cu3O7-x, i.e., a sintered Dy2O3 or a compacted Dy2O3 powder. Resulting microstructures are compared ... [more ▼]

We have considered two types of interacting substrates for testing the melt-textured growth of DyBa2Cu3O7-x, i.e., a sintered Dy2O3 or a compacted Dy2O3 powder. Resulting microstructures are compared. Compacted powders are found to provide the most developed 123 grains. Physical and chemical arguments are given for such findings. [less ▲]

Detailed reference viewed: 22 (0 ULg)
See detailDye Laser Wavelength Scanning
Carapelle, Alain ULg; Bastin, Thierry ULg; Garnir, Henri-Pierre ULg et al

Poster (1996)

Detailed reference viewed: 12 (7 ULg)
Peer Reviewed
See detailDyke swarms in the Pan-African basement from the Alpine Danubian window : new field and geochemical investigation in southern Carpathians (Romania)
Femenias, Olivier; Demaiffe, Daniel; Liégeois, Jean-Paul ULg et al

in Journal of Conference Abstracts (2001), 6

Detailed reference viewed: 19 (0 ULg)
Full Text
See detailDylan Thomas en chansons
Delville, Michel ULg

Article for general public (2010)

Detailed reference viewed: 26 (1 ULg)
See detailDynamath
Jaminon, Martine ULg; Wallenborn, Jean; Spitz, Carole et al

Learning material (2011)

Plaquette de l'exposition "Dynamath : les maths à la portée de tous"

Detailed reference viewed: 19 (4 ULg)
Peer Reviewed
See detailDynamic Accelerated Failure Time Model with Endogeneity and Heterogeneity: a Control Function approach
Tiwari, Amaresh Kumar ULg; Heuchenne, Cédric ULg

Conference (2013, August)

We develop a control function method to estimate an Accelerated Failure Time (AFT) model with multiple states, where we account for state dependence, heterogeneity, and endogeneity of covariates. In ... [more ▼]

We develop a control function method to estimate an Accelerated Failure Time (AFT) model with multiple states, where we account for state dependence, heterogeneity, and endogeneity of covariates. In accounting for state dependency in the structural AFT model and endogeneity of covariates through control functions, we are faced with predetermined covariates in the first stage treatment choice equation, which is a system of regressions for panel data. A concentrated likelihood method has been proposed to estimate a system of regressions with predetermined covariates. The control functions are based on "expected a posteriori" (EAP) values of the correlated random effects, and unlike alternative control function approaches, our approach allows for general instruments. [less ▲]

Detailed reference viewed: 38 (0 ULg)
Full Text
See detailDynamic analysis and preliminary design of twin-cylinder engines for clean propulsion systems
Louvigny, Yannick ULg; Vanoverschelde, Nicolas; Janssen, Guy et al

Conference (2009, July 02)

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines ... [more ▼]

Facing environmental and energy challenges, automotive industry has to improve the fuel economy of vehicles and to reduce their polluting emissions. In this particular context, small twin-cylinder engines regain interest for using in urban cars or as prime movers in hybrid electric cars. One difficulty with engine having few cylinders (three or less) comes from the balancing of the inertia forces created by the moving parts. Several models (from simple analytical model to complex flexible multibody simulation) of different configurations of twin-cylinder engine are developed. These models allow computing the inertia forces and moments generated by the engines and computing the strains and stresses of engine components. An important step is the engine balancing by modification of the crankshaft counterweights or by addition of balance shafts. The effect of the gas pressure on the balancing and on the component’s strains and stresses is also modelled. At the end, a comparison of the different configurations of twin-cylinder engine is provided [less ▲]

Detailed reference viewed: 156 (12 ULg)
Full Text
Peer Reviewed
See detailA dynamic analysis of higher-comoment risk premiums in Hedge Fund returns
Lambert, Marie ULg

in Journal of Derivatives and Hedge Funds (2012), 18(1), 73-84

Hedge funds display a strong non-linear payoff structure because of the use of highly dynamic trading strategies. This article examines the relevance of using higherorder comoment equity risk premiums ... [more ▼]

Hedge funds display a strong non-linear payoff structure because of the use of highly dynamic trading strategies. This article examines the relevance of using higherorder comoment equity risk premiums implied in the United States and the emerging markets for capturing these return non-linearities. We provide evidence that the higherorder comoment equity risk premiums help in explaining the returns of the different hedge fund strategies from the Hedge Fund Research classification. We perform a dynamic analysis where moment risk exposures are examined separately in up and down markets. We show that hedge fund styles tend to vary their exposures to moment risks according to the market regimes. [less ▲]

Detailed reference viewed: 47 (7 ULg)
Full Text
Peer Reviewed
See detailDynamic analysis of microbial behaviour face to envrionmental heterogeneities encountered in large-scale bioreactors
Sunya, Sirichai; Bideaux, Carine; Uribellarea, Jean-Louis et al

in Delvigne, Frank (Ed.) BASE (2011)

Detailed reference viewed: 25 (6 ULg)
Full Text
Peer Reviewed
See detailDynamic analysis of the nonlinear behavior of MEMS using the finite element formulation
Rochus, Véronique ULg; Kerschen, Gaëtan ULg; Golinval, Jean-Claude ULg

in ASME International Design Engineering Technical Conferences & Computers and Information in Engineering Conference, Long Beach, 2005 (2005, September)

The dynamic response of a mass-spring model of electrostatically actuated MEMS is analyzed when a voltage step is applied. The dynamics of a clamped-clamped beam representing a micro-bridge system are ... [more ▼]

The dynamic response of a mass-spring model of electrostatically actuated MEMS is analyzed when a voltage step is applied. The dynamics of a clamped-clamped beam representing a micro-bridge system are also considered. To model and simulate the strong coupling between the electric and mechanical fields, a general finite element program has been developed based on a new monolithic formulation. The methodology proposed in this program does not require any iterative numerical scheme based on separate electrostatic and mechanical solvers, respectively. [less ▲]

Detailed reference viewed: 82 (27 ULg)
Full Text
Peer Reviewed
See detailDynamic analysis of the self-locking phenomenon in tape spring hinges
Hoffait, Sébastien ULg; Bruls, Olivier ULg; Granville, Didier et al

in Acta Astronautica (2010), 66(7-8), 1125-1132

This paper investigates the dynamic behaviour of tape-spring hinges that are commonly used in space deployable structures. During the deployment of an appendice (e.g. a solar panel or a beam), a tape ... [more ▼]

This paper investigates the dynamic behaviour of tape-spring hinges that are commonly used in space deployable structures. During the deployment of an appendice (e.g. a solar panel or a beam), a tape-spring hinge allows the simultaneous achievement of the actuating, guiding and self-locking functions without friction elements. The proposed finite element model is able to capture buckling and hysteresis phenomena, which have a strong influence on the 3D motion of the system. A detailed analysis of those effects is developed, leading to a physical explanation of the crucial self-locking phenomenon. [less ▲]

Detailed reference viewed: 153 (20 ULg)
Peer Reviewed
See detailDynamic Analysis Used to Cope with Partial and Temporary Failures
Franssen, Jean-Marc ULg; Gens, Frederic

in Franssen, Jean-Marc; Benichou, Nouredine; Kodur, Venkatesh (Eds.) et al Proceedings of SiF'04: Third International Structures in Fire workshop (2004)

Detailed reference viewed: 71 (2 ULg)
Full Text
Peer Reviewed
See detailDynamic And Equilibrium Surface Tensions Of Surfactin Aqueous Solutions
Razafindralambo, Hary ULg; Thonart, Philippe ULg; Paquot, Michel ULg

in Journal of Surfactants and Detergents (2004), 7(1), 41-46

A homologous series of surfactins containing β-hydroxy fatty acids having 13, 14, or 15 carbon atoms were isolated from the supernatant of Bacillus subtilis strain S499 cultures. Their surface-active ... [more ▼]

A homologous series of surfactins containing β-hydroxy fatty acids having 13, 14, or 15 carbon atoms were isolated from the supernatant of Bacillus subtilis strain S499 cultures. Their surface-active properties at the air-water interface were then evaluated. Dynamic surface tension data were analyzed by the relaxation function γt=γm+(γo−γm)/[1+(t/t*)n]. Based on various parameters t*, n, vmax, γm calculated from this equation, the dynamic surface properties of surfactin were found to depend on both bulk concentration and hydrophobic character of the alkyl chain. At low concentrations of surfactin, the dynamic surface tension (γd) decreased with increasing carbon atom number of the surfactin alkyl chain (n=13 to 15). However, at high concentrations, the maximum decrease of 41-4 was achieved by surfactin-C14. In contrast, more strongly hydrophobic alkyl chains in surfactins always enhanced their ability in reducing the equilibrium surface tensions and their aptitude in forming micelles. [less ▲]

Detailed reference viewed: 121 (78 ULg)
Full Text
Peer Reviewed
See detailDynamic and impact of major insect pests on Jatropha curcas L. in two cropping systems with contrasting characteristics in the province of Kinshasa (DRC)
Minengu, Jean de Dieu; Verheggen, François ULg; Mergeai, Guy ULg

in Tropicultura (2015), 3

The dynamic and impact of the major insect pests on Jatropha curcas L. were studied on two plantations located in the province of Kinshasa, the first in pure stand without irrigation (Mbankana site), the ... [more ▼]

The dynamic and impact of the major insect pests on Jatropha curcas L. were studied on two plantations located in the province of Kinshasa, the first in pure stand without irrigation (Mbankana site), the second under irrigation in combination with other crops (N'sele site). In Mbankana, after being planted during the long rainy season (October - December), the plants suffer significant attacks by crickets Brachytrupes membranaceus Drury (Orthoptera, Gryllidae), which cause a mortality rate of 10 - 40%. The first half of October and second half of December are the best planting periods when it comes to limiting these losses. At N'sele, cricket attacks during planting are controlled by the farmers who eat these insects. After being planted at both sites, the plants are attacked by leaf miner caterpillars Stomphastis thraustica Meyrick (Lepidoptera, Gracillariidae) and flea beetles Aphthona sp. (Coleoptera, Chrysomelidae), which consume the leaf blades and buds. The size of these two pest populations and resulting damage reach a peak during the wettest time of year. On adult plants at N'sele, insect pests observed include flea beetles, leaf miners, and shield-backed bugs Calidea sp. (Heteroptera, Scutelleridae). These bugs cause damage to flowers and capsules. In the absence of insecticide treatments, yield losses reached 90% in Mbankana and 60% in N'sele. The discussion focuses on what causes the different pest impact levels recorded between the cropping systems and methods used to limit the main types of damage caused by insects on J. curcas in the Kinshasa region. [less ▲]

Detailed reference viewed: 30 (1 ULg)
See detailDynamic and Mobile GIS: Investigating Changes in Space and Time
Drummond, Jane; Billen, Roland ULg; Joao, Elsa et al

Book published by CRC Press (2007)

Detailed reference viewed: 67 (8 ULg)
See detailDynamic and region specific changes in estrogen production induced by reproductive stimuli.
de Bournonville, Catherine ULg; Dickens, Molly J; Ball, Gregory F et al

Poster (2012, May 04)

Detailed reference viewed: 12 (0 ULg)
See detailDynamic and static aspects of voltage collapse
Van Cutsem, Thierry ULg

in Proc. International Workshop on "Bulk Power System Voltage Phenomena - voltage stability and security" (1988)

Detailed reference viewed: 60 (0 ULg)
Full Text
Peer Reviewed
See detailDynamic approach of structural fire calculation with FEM software
Vassart, Olivier; Cajot, Louis-Guy; Franssen, Jean-Marc ULg et al

in Proc. 5th International Conference on Performance-Based Codes and Fire Safety Design Methods (2004)

This paper explains how the dynamic approach has been implemented in the computer software SAFIR in order to cope with temporary and local failures that occured in a step be step static analysis of ... [more ▼]

This paper explains how the dynamic approach has been implemented in the computer software SAFIR in order to cope with temporary and local failures that occured in a step be step static analysis of structures subjected to fire.By means of this recently implemented dynamic algorithm, it’s now possible to simulate the complete failure mechanism, to predict the influence of a local failure on the global behaviour of the structure and to follow eventually the progressive collapse. Therefore the resistance time is now really determined whereas in the past many numerical failure corresponding to local failure were interpreted as resistance time of the whole structure. [less ▲]

Detailed reference viewed: 80 (0 ULg)