Action du maître de l'ouvrage contre le sous-traitant: le débat n'est pas clos. Note sous C.A., 28 juin 2006

in Entreprise et le Droit (L') = Tijdschrift voor Aannemingsrecht (2006)

Use of a High-Temperature Superconducting Coil for Magnetic Energy Storage

in Institute of Physics Conference Series (2006), 43

A high temperature superconducting magnetic energy storage device (SMES) has been realised using a 350 m-long BSCCO tape wound as a ''pancake'' coil. The coil is mounted on a cryocooler allowing ... [more ▼]

A high temperature superconducting magnetic energy storage device (SMES) has been realised using a 350 m-long BSCCO tape wound as a ''pancake'' coil. The coil is mounted on a cryocooler allowing temperatures down to 17.2 K to be achieved. The temperature dependence of coil electrical resistance R(T) shows a superconducting transition at T = 102.5 K. Measurements of the V(I) characteristics were performed at several temperatures between 17.2 K and 101.5 K to obtain the temperature dependence of the critical current (using a 1 uV/cm criterion). Critical currents were found to exceed 100 A for T < 30 K. An electronic DC-DC converter was built in order to control the energy flow in and out of the superconducting coil. The converter consists of a MOS transistor bridge switching at a 80 kHz frequency and controlled with standard Pulse Width Modulation (PWM) techniques. The system was tested using a 30 V squared wave power supply as bridge input voltage. The coil current, the bridge input and output voltages were recorded simultaneously. Using a 10 A setpoint current in the superconducting coil, the whole system (coil + DC-DC converter) can provide a stable output voltage showing uninterruptible power supply (UPS) capabilities over 1 s. [less ▲]

Lipid-Destabilising Properties Of A Peptide With Structural Plasticity

in Chemistry and Physics of Lipids (2006), 141(1-2), 185-96

The Chameleon peptide (Cham) is a peptide designed from two regions of the GB1 protein, one folded as an alpha-helix and the other as a beta structure. Depending on the environment, the Cham peptide ... [more ▼]

The Chameleon peptide (Cham) is a peptide designed from two regions of the GB1 protein, one folded as an alpha-helix and the other as a beta structure. Depending on the environment, the Cham peptide adopts an alpha or a beta conformation when inserted in different locations of GB1. This environment dependence is also observed for tilted peptides. These short protein fragments, able to destabilise organised system, are mainly folded in beta structure in water and in alpha helix in a hydrophobic environment, like the lipid bilayer. In this paper, we tested whether the Cham peptide can be qualified as a tilted peptide. For this, we have compared the properties of Cham peptide (hydrophobicity, destabilising properties, conformation) to those of tilted peptides. The results suggest that Cham is a tilted peptide. Our study, together the presence of tilted fragments in transconformational proteins, suggests a relationship between tilted peptides and structural lability. [less ▲]

On the application and interpretation of Keeling plots in paleo climate research - Deciphering δ 13C of atmospheric CO 2 measured in ice cores

in Biogeosciences (2006), 3(4), 539-556

The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here, we ... [more ▼]

The Keeling plot analysis is an interpretation method widely used in terrestrial carbon cycle research to quantify exchange processes of carbon between terrestrial reservoirs and the atmosphere. Here, we analyse measured data sets and artificial time series of the partial pressure of atmospheric carbon dioxide (pCO(2)) and of delta C-13 of CO2 over industrial and glacial/interglacial time scales and investigate to what extent the Keeling plot methodology can be applied to longer time scales. The artificial time series are simulation results of the global carbon cycle box model BICYCLE. The signals recorded in ice cores caused by abrupt terrestrial carbon uptake or release loose information due to air mixing in the firn before bubble enclosure and limited sampling frequency. Carbon uptake by the ocean cannot longer be neglected for less abrupt changes as occurring during glacial cycles. We introduce an equation for the calculation of long-term changes in the isotopic signature of atmospheric CO2 caused by an injection of terrestrial carbon to the atmosphere, in which the ocean is introduced as third reservoir. This is a paleo extension of the two reservoir mass balance equations of the Keeling plot approach. It gives an explanation for the bias between the isotopic signature of the terrestrial release and the signature deduced with the Keeling plot approach for long-term processes, in which the oceanic reservoir cannot be neglected. These deduced isotopic signatures are similar (-8.6 parts per thousand) for steady state analyses of long-term changes in the terrestrial and marine biosphere which both perturb the atmospheric carbon reservoir. They are more positive than the delta C-13 signals of the sources, e.g. the terrestrial carbon pools themselves (similar to -25 parts per thousand). A distinction of specific processes acting on the global carbon cycle from the Keeling plot approach is not straightforward. In general, processes related to biogenic fixation or release of carbon have lower y-intercepts in the Keeling plot than changes in physical processes, however in many case they are indistinguishable (e.g. ocean circulation from biogenic carbon fixation). [less ▲]

L'exercice devant le juge civil de l'action en réparation fondée sur un fait qualifié d'infraction pénale : à quel moment et selon quel mode introductif d'instance ?

in Revue de Jurisprudence de Liège, Mons et Bruxelles (2006)

Index des formes

in Boutier, Marie-Guy; Lechanteur, Jean; Counet, Marie-Thérèse (Eds.) Atlas linguistique de la Wallonie. Tome 6. La terre, les plantes et les animaux (2006)

Etude de la diversité des pucerons et des auxiliaires adiphages relative à la présence d'orties en bordures de champ

in Notes Fauniques de Gembloux (2006), 59(2), 121-124

Conceptualisaiton d'un événement de santé et sa prise en compte dans la collecte des biographies individuelles

in Cahiers Québecois de Démographie (2006), 35/2(Automne), 161-174

Depuis quelques années, les recherches sur les inégalités existant entre les individus par rapport à leur santé se focalisent sur l’influence exercée par les conditions sociales tout au long du cycle de ... [more ▼]

Depuis quelques années, les recherches sur les inégalités existant entre les individus par rapport à leur santé se focalisent sur l’influence exercée par les conditions sociales tout au long du cycle de vie. En somme, c’est l’aspect dynamique de la santé qui est de plus en plus privilégié. Cependant, la collecte d’un événement de santé au moyen de l’approche biographique a été rarement mise en oeuvre dans les recueils biographiques. La présente note vise à présenter le cheminement conceptuel et la démarche méthodologique que nous avons suivis pour définir un événement de santé et l’intégrer dans une enquête biographique mise en place en Belgique. La première partie de cette note présente succinctement les définitions allouées à l’état de santé d’un individu. La deuxième partie met en lumière les avantages et les limites de la collecte longitudinale et montre l’intérêt de l’approche biographique. La troisième partie, enfin, est consacrée à la présentation de l’approche innovatrice que nous avons mise en oeuvre, autour de l’idée des interruptions d’activités, pour collecter un événement de santé dans un dispositif biographique. [less ▲]

Logement et gestion du foncier

Article for general public (2006)

Quantitative analysis of atmosphere by laser—induced breakdown spectroscopy

in Journal of Applied Optics (2006), 27(2), 147-151

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy， plasmas were produced by a Q—switched Nd ：YAG laser interacted with the air at atmospheric ... [more ▼]

In order to investigate the feasibility of quantitative analysis with laser—induced breakdown spectroscopy， plasmas were produced by a Q—switched Nd ：YAG laser interacted with the air at atmospheric pressure，then the light of plasmas entered the monochrom eter and transferred into an electric signal，and the spectra of these plasmas in the range of 600～ 800 nm were stored and analyzed by the calibration—free mode1．Under the condition of delay time of 8 s and gating pulse of 0．4 s，the temperature of plasmas，which was in local thermal equilibrium (LTE)，was 1．62× 10 K which was obtained by means of the two—dimensional Boltzmann plane．The 20．75 oxygen content and 79．25％nitrogen content in air were detected on the assum ption that there were only oxygen and nitrogen constituents in the air．The results coincide well with the fact．The feasibility was validated by the experiment，and it built a strong basis for the further study and experiment of air pollutant monitoring． [less ▲]