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 detailHow as a transmission system operator (TSO) to respond to the growing public concern on the potential health effects of ELF exposure ?
Du Four, Vincent; Ledent, Maryse ULiege; Lilien, Jean-Louis ULiege et al

in Proceedings of the 2d International Conference on Extremely Low Frequency Electric and Magnetic fields (2011, March)

Public exposure of extremely low frequency (50 Hz) electric and magnetic fields are a major concern for transmission system operators.Measurements are presented as well as technical solutions to reduce ... [more ▼]

Public exposure of extremely low frequency (50 Hz) electric and magnetic fields are a major concern for transmission system operators.Measurements are presented as well as technical solutions to reduce ELF and public acceptance are discussed. [less ▲]

Detailed reference viewed: 65 (6 ULiège)
Full Text
Peer Reviewed
See detailHow asteroseismology can constrain the global parameters of solar-like star models
Ozel, N.; Dupret, Marc-Antoine ULiege; Baglin, A.

in Astrophysics & Space Science (2010), 328

In the previous years, p-mode oscillations (pressure oscillations stochastically excited by convection) have been detected in several solar-like stars thanks to the ground-based spectroscopic and space ... [more ▼]

In the previous years, p-mode oscillations (pressure oscillations stochastically excited by convection) have been detected in several solar-like stars thanks to the ground-based spectroscopic and space spectroscopic and photometric observations. We study the importance of seismic constraints on stellar modeling and the impact of their accuracy on reducing the uncertainties of global stellar parameters (i.e. mass, age, etc.). We use the Singular Value Decomposition (SVD) method to analyze the sensitivity of stellar models to seismic constraints. In this context, we construct a grid of evolutionary sequences for solar-like stars with varying age and mass. Around each model of this grid, we evaluate the partial derivatives with respect to a large set of free parameters: mass â ³, age Ï , mixing-length parameter α, initial helium abundance Y [SUB]0[/SUB], and initial metallicity Z/ X [SUB]0[/SUB]. Masses between 0.9 and 1.55 M [SUB]ȯ[/SUB] and central hydrogen abundances from Xc=0.7 to 0.05 have been considered in this study. [less ▲]

Detailed reference viewed: 12 (2 ULiège)
Full Text
See detailHow asteroseismology can help to precisely constrain properties of planet-host stars
Salmon, Sébastien ULiege; Montalban Iglesias, Josefa ULiege; Lanotte, Audrey ULiege et al

Poster (2011, January)

Nowadays more than 500 exoplanets have been discovered, mainly studied by radial velocity and transit measurements. Precise knowledge on their characteristics is crucial to develop theories of planetary ... [more ▼]

Nowadays more than 500 exoplanets have been discovered, mainly studied by radial velocity and transit measurements. Precise knowledge on their characteristics is crucial to develop theories of planetary formation and evolution. In that aim, not only star and planet(s) masses but also the evolutionary stage of systems are needed. From radial velocity measurements one has to assume the inclination and the stellar mass of the system to disentangle the mass of the planet. When transit is observable, one can measure the ratio of planetary and stellar radii. Finally, the degree of evolution of the system is determined by the one of the star. Thus the host star must be well known to obtain a full set of system properties. However, determination of stellar parameters such as the mass, radius and its evolution from classical observables (Teff, log g, [Fe/H]) suffers of large uncertainties. This is particularly true for dwarf stars on the Main Sequence. Fortunately we can obtain better constrains with the help of asteroseismology. That latter approach probes the stellar properties through observation of oscillations present in stars. With the launches of high-precision photometry space missions, CoRoT and Kepler, we are now able to detect oscillations in a huge number of stars. In particular Kepler photometry, primarily intended to detect transits of planet, can give accurate stellar parameters of planetary systems as it also affords to make [less ▲]

Detailed reference viewed: 50 (9 ULiège)
See detailHow become waxed and wax became a copula
Petré, Peter ULiege

Conference (2007)

Detailed reference viewed: 8 (0 ULiège)
Full Text
Peer Reviewed
See detailHow Bees Deter Elephants: Beehive Trials with Forest Elephants (Loxodonta africana cyclotis) in Gabon
Ngama, Steeve ULiege; Korte, Lisa; Bindelle, Jérôme ULiege et al

in PLoS ONE (2016), 11(5), 12

In Gabon, like elsewhere in Africa, crops are often sources of conflict between humans and wildlife. Wildlife damage to crops can drastically reduce income, amplifying poverty and creating a negative ... [more ▼]

In Gabon, like elsewhere in Africa, crops are often sources of conflict between humans and wildlife. Wildlife damage to crops can drastically reduce income, amplifying poverty and creating a negative perception of wild animal conservation among rural people. In this context, crop-raiding animals like elephants quickly become “problem animals”. To deter elephants from raiding crops beehives have been successfully employed in East Africa; however, this method has not yet been tested in Central Africa. We experimentally examined whether the presence of Apis mellifera adansonii, the African honey bee species present in Central Africa, deters forest elephants (Loxodonta Africana cyclotis) from feeding on fruit trees. We show for the first time that the effectiveness of beehives as deterrents of elephants is related to bee activity. Empty hives and those housing colonies of low bee activity do not deter elephants all the time; but beehives with high bee activity do. Although elephant disturbance of hives does not impede honey production, there is a tradeoff between deterrence and the quantity of honey produced. To best achieve the dual goals of deterring elephants and producing honey colonies must maintain an optimum activity level of 40 to 60 bee movements per minute. Thus, beehives colonized by Apis mellifera adansonii bees can be effective elephant deterrents, but people must actively manage hives to maintain bee colonies at the optimum activity level. [less ▲]

Detailed reference viewed: 153 (20 ULiège)
See detailHow behavioural studies can lead to intensive aquaculture of the tilapia. Half a century research at the University of Liège
Ruwet, Jean-Claude; Poncin, Pascal ULiege

Article for general public (1992)

Detailed reference viewed: 20 (0 ULiège)
Full Text
Peer Reviewed
See detailHow biomechanical analysis may help to identify abdominal injury causes in high level tennis
Tubez, François ULiege; Forthomme, Bénédicte ULiege; Croisier, Jean-Louis ULiege et al

Conference (2015, July)

This research studies the case of a professional tennis player who has suffered from a medical tear on the left rectus abdominis muscle after a tennis serve. The goal of the study is to understand whether ... [more ▼]

This research studies the case of a professional tennis player who has suffered from a medical tear on the left rectus abdominis muscle after a tennis serve. The goal of the study is to understand whether the injury could be explained by an inappropriate technique. For this purpose, we analyzed the three dimensions kinematic and kinetic of the serve. We also performed isokinetic tests of the knees. We compared the player to five other professional players. We observed a possible deficit of energy transfer because of an important anterior pelvis tilt. Some compensations of the player during serve could be a possible higher abdominal contraction and a larger shoulder external rotation. These particularities could induce an abdominal overwork that would explain the first injury and may provoke a new injury. [less ▲]

Detailed reference viewed: 77 (10 ULiège)
Full Text
See detailHow bright is the Io UV footprint?
Bonfond, Bertrand ULiege; Grodent, Denis ULiege; Gérard, Jean-Claude ULiege et al

Conference (2010)

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint ... [more ▼]

The electro-magnetic interaction between Io and the Jovian magnetosphere generates a perturbation in the magnetospheric plasma which propagates along the magnetic field lines and creates auroral footprint emissions in both hemispheres. Recent results showed that this footprint is formed of several spots and an extended tail. Each feature is suggested to correspond to a different step in the propagation of the perturbation and in the electron energization processes. The present study focuses on the variations of the spots' brightness at different timescales from minutes to years through the rotation period of Jupiter. It relies on FUV images acquired with the STIS and ACS instruments onboard the Hubble Space Telescope. Since the footprint is composed of several localized features, a good understanding of the emission region geometry is critical to derive the actual vertical brightness and thus the precipitated energy flux. We developed a 3D emission model in order to assess as precisely as possible the respective contribution of each individual feature and to correctly estimate the precipitating energy flux. As far as the brightness variations on timescales of minutes are concerned, we will present results from the high time resolution campaign executed during summer 2009. On timescale of several hours, we will show that the variation of the emitted power as a function of the location of Io in the plasma torus suggests that the Jovian surface magnetic field strength is an important controlling parameter. Finally, the measured precipitated power and particle fluxes will be discussed in comparison with recent simulations considering both Alfvén waves filamentation and electron acceleration when the Alfvén waves become inertial. [less ▲]

Detailed reference viewed: 32 (0 ULiège)
Full Text
Peer Reviewed
See detailHow can a steel structure survive to impact loading? Numerical and analytical investigations
Demonceau, Jean-François ULiege; Comeliau, Ludivine; Hoang, Van Long ULiege et al

in Open Civil Engineering Journal (The) (2016), 10

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the ... [more ▼]

Recent events such as natural catastrophes or terrorism attacks have highlighted the necessity to ensure the structural integrity of buildings under exceptional events. For more than 10 years, the University of Liege is strongly involved in researches investigating the response of structures further to such exceptional events ([1] and [2]). The present paper gives a global overview on recent or ongoing developments performed at the University of Liege in the field of robustness of steel building structures subjected to impact loading leading to the loss of a column. The conducted studies are founded on a combination of experimental, numerical and analytical approaches with the final aim to propose simplified procedures useful for practitioners and allowing ensuring an appropriate level of robustness to structures for the considered scenario [less ▲]

Detailed reference viewed: 151 (39 ULiège)
See detailHow can an embryo become a prophet?
Swennen, Philippe ULiege

Conference (2015, August 24)

Both Vedic and Avestan sacrifices show us how a sacrificer tries to make contact with his gods in the context of complex liturgical ceremonies implying the presence of priests who offer several kinds of ... [more ▼]

Both Vedic and Avestan sacrifices show us how a sacrificer tries to make contact with his gods in the context of complex liturgical ceremonies implying the presence of priests who offer several kinds of gifts, for instance poems, libations or slaughtered cattle. In both cases the religious doctrine justifying the liturgical process explains that the sacrificial ground and space correspond to the beginning of Time, but the definitions given to these beginnings are extremely divergent. This is surprising, because Indo-Iranian linguistics strongly suggests that both religious systems should be genetically very close. In Vedic India, the sacrificer represents an embryo, which should have been a god, but begets the human race. In Iran, he renews the first perfect ceremony achieved by Zarathushtra, the so-called prophet who chose to revere Ahura Mazda. How did one similar doctrine produce two so different products? [less ▲]

Detailed reference viewed: 13 (1 ULiège)
Full Text
See detailHow can cobalt complexes help synthetic polymer chemists?
Debuigne, Antoine ULiege; Jérôme, Robert ULiege; Jérôme, Christine ULiege et al

Conference (2009, March 19)

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and ... [more ▼]

Nowadays, progresses in medicine, biotechnology, microelectronic and many other fields are more and more sustained by the development of novel polymer materials with constantly improved properties and well-defined molecular parameters. In this context, we designed a controlled radical polymerization (CRP) technique based on cobalt complexes which is able to efficiently control the radical polymerization of challenging monomers such as vinyl acetate (VAc), N-vinyl pyrrolidone (NVP) and acrylonitrile (AN). This so-called Cobalt-Mediated Radical Polymerization (CMRP) also gave access to unique diblock copolymers by sequential polymerization of the above mentioned monomers. However, addition of isoprene to polymer chains preformed by CMRP did not lead to the expected poly(isoprene) containing copolymers. Instead, the quantitative coupling reaction of the polymer chains was observed, as assessed by the perfect doubling of the molar mass of the initial macromolecules. This result is very exciting because this so-called Isoprene-Assisted Radical Coupling (I-ARC) reaction is not limited to polymers with low molar masses and homopolymers, contrary to the existing radical chains coupling methods. Indeed, when applied to diblock copolymers, IARC constitutes a straightforward approach for the synthesis of telechelic symmetrical ABA triblock copolymers and is thus a very promising tool for macromolecular engineering. [less ▲]

Detailed reference viewed: 65 (8 ULiège)
Full Text
See detailHow can cobalt complexes help synthetic polymer chemists?"
Debuigne, Antoine ULiege; Jérôme, Christine ULiege; Detrembleur, Christophe ULiege

Conference (2009, December 07)

Detailed reference viewed: 34 (8 ULiège)
Peer Reviewed
See detailHow can intermodal transport support the logistical strategies of enterprises: a study on the opportunities and bottlenecks
Marchal, Jean ULiege; Macharis, C.; Lundoluka, F. et al

in How can intermodal transport support the logistical strategies of enterprises: a study on the opportunities and bottlenecks (2004)

Detailed reference viewed: 9 (0 ULiège)
Peer Reviewed
See detailHow can intermodal transport support the logistical strategies of enterprises: a study on the opportunities and bottlenecks
Marchal, Jean ULiege; Macharis, Cathy; Vereecken, Laetitia

(2004)

Intermodal freight transport is the movement of goods in one and the same load unit or vehicle by successive modes of transport without handling of the goods themselves when changing modes (European ... [more ▼]

Intermodal freight transport is the movement of goods in one and the same load unit or vehicle by successive modes of transport without handling of the goods themselves when changing modes (European Conference of Ministers of Transport et al. 1997). Altough it has still a small market share compared to road transport, it becomes more and more apparant that intermodal transport transport will play an important role in the future. Intermodal transport is more environmental friendly than road transport (Kreutzberger et al., 2003) and has a positive effect on the congestion problems (Van Schijndel and Dinwoodie, 2000). A third and important positive feature of intermodal transport is that it can easily fit in the supply chain management efforts by the companies. In this paper the missing links and opportunities for the intermodal transportsector are analysed. Also solutions for overcoming these bottlenecks are proposed. [less ▲]

Detailed reference viewed: 59 (3 ULiège)
Full Text
See detailHow can large scale integrated surface - subsurface hydrological model be used to evaluate long term climate change impact on groundwater reserves
Goderniaux, Pascal ULiege; Brouyère, Serge ULiege; Fowler, Hayley J. et al

in Proceeding of the 7th international conference on calibration and reliability in groundwater modeling (2009, September)

Detailed reference viewed: 92 (37 ULiège)
Full Text
See detailHow can long-term experimental plots can help us to understand the sustainability of different phosphorus inputs ?
Renneson, Malorie ULiege; dufey, Joseph; Roisin, Christian et al

Poster (2014)

During the last twenty years, we observed a constant reduction of mineral fertilizer use, due to prices increase and environmental awareness, and an increase of crop removal, leading to a phosphorus (P ... [more ▼]

During the last twenty years, we observed a constant reduction of mineral fertilizer use, due to prices increase and environmental awareness, and an increase of crop removal, leading to a phosphorus (P) budget decrease. These changes are feared for a decrease of soil P content, which is already observed in some regions in Wallonia. However, P being an essential element for plant growth, is a such management compatible with yield maintaining? Are the current cropping systems sustainable? To answer to the questions, different studies are made. However, long-term data are rarely available to understand the influence of cropping systems on the soil behavior, leaching risks or to choose adequate indicators of P. To answer to these questions in our soils, 2 experimental plots of the Walloon Agricultural Research Center. These experimental plots were established in 1967 and 1959 in order to evaluate the effect of, respectively, 3 P and K input levels and different organic inputs on the production. Soils samples were taken in plots and analyzed in laboratory. So, different P indicators and edaphic parameters were determined. This study showed that all indicators are coherent with P levels and correlated with yields but no many differences can be shown between fertilizer types. Meanly, zero P-input engenders a decrease of yield of 7%, while a double input increases yield of 2% in comparison to plots with an input corresponding to crop export. So, financially, the zero P-input option is rarely profitable in the long-term and double input of P removed is never financially sustainable. Leaching into deeper soils levels was studied with analysis of deeper horizons which indicated any leaching , even in plots with double inputs. Indeed, soil P contents in depth were similar in these plots than those with no P-inputs or soils under forest cover. So, to conclude, these plots help to study the sustainability of cropping systems in real situations and to determine appropriate management of P. [less ▲]

Detailed reference viewed: 44 (2 ULiège)
Full Text
Peer Reviewed
See detailHow can long-term experimental plots can help us to understand the sustainability of different phosphorus inputs ?
Renneson, Malorie ULiege; Dufey, Joseph; Roisin, Christian et al

Poster (2013, September)

Detailed reference viewed: 37 (10 ULiège)