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See detailDesertification: migration, health, remediation and local governance
Marchal, Jean ULg

(2008)

Le terme de désertification est souvent associé dans les esprits à l'avancée du désert dont les dunes de sable envahissent lentement et inexorablement les régions fertiles proches. Cette vision populaire ... [more ▼]

Le terme de désertification est souvent associé dans les esprits à l'avancée du désert dont les dunes de sable envahissent lentement et inexorablement les régions fertiles proches. Cette vision populaire de la désertification a perdu tout fondement dans la plupart des milieux scientifiques : les déserts africains ne poursuivent pas leur inlassable marche vers le Sud, détruisant tout sur leur passage. On définit aujourd'hui la désertification comme un phénomène surtout socio-économique où les ressources naturelles se dégradent par les pressions démographiques et des pratiques d'occupation du sol présentant un caractère non durable. Les processus de formation de nouvelles régions désertiques où la diversité se trouve détruite sont fortement corrélés à la dégradation des sols, c'est-à-dire à l'appauvrissement progressif de leurs potentiels physiques, biologiques et économiques. Cette dégradation des sols menace sérieusement la productivité globale et, par conséquent, la subsistance de la population. Elle réduit la diversité de la vie végétale et animale, comme elle force les populations à se déplacer et à changer leur mode de vie, ce qui a aussi des conséquences sur la diversité, de culture, de langue et de savoir, des communautés habitant la zone dégradée. [less ▲]

Detailed reference viewed: 65 (8 ULg)
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See detailDesertificazione in Africa
Ozer, Pierre ULg

Scientific conference (2010, November 10)

Detailed reference viewed: 46 (5 ULg)
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See detailDéserts, poussières et migrations
Ozer, Pierre ULg

Article for general public (2006)

Chaque année, le Sahara injecte près d'un milliard de tonnes de poussières dans l'atmosphère. Plus de 100 millions de tonnes de ces poussières prennent la direction de l'Europe. Beaucoup d'entre elles se ... [more ▼]

Chaque année, le Sahara injecte près d'un milliard de tonnes de poussières dans l'atmosphère. Plus de 100 millions de tonnes de ces poussières prennent la direction de l'Europe. Beaucoup d'entre elles se perdent dans la Méditerranée avant d'atteindre le Vieux Continent. D'autres retombent au gré des pluies et recouvrent périodiquement nos véhicules. Elles constituent un véritable problème de santé publique dans le sud de l'Europe, comme en Espagne, car l'importante concentration de ces fines particules dégrade la qualité de l'air que nous respirons. Certes, ce phénomène a toujours existé. Mais il a très fortement augmenté depuis les années 1980, depuis que les zones péridésertiques sont sujettes aux processus de plus en plus pressants de désertification. La végétation ayant disparu sur des centaines de millions d'hectares, de nouveaux sols ont été emportés par le vent. [...] [less ▲]

Detailed reference viewed: 517 (54 ULg)
See detailLe désherbage mécanique, une technique d'avenir
Dardenne, J.; Dewez, G.; Vandersmissen, P. et al

in Revue de l’Agriculture = Landbouwtijdschrift (1992), 45(6), 1193-1200

Detailed reference viewed: 26 (1 ULg)
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See detailDesiccation cracks formation in clay-barrier for nuclear waste disposal
Hubert, Julien ULg; Prime, Noémie; Plougonven, Erwan ULg et al

Conference (2016, February 16)

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the ... [more ▼]

In geotechnical engineering, the desiccation cracking of soil is commonly observed. This phenomenon is detrimental to the behavior of earth material and earth structure. Desiccation cracks can lead to the overall failure of many geotechnical structures: • They can affect the slope stability of earth dams or embankments; • They can initiate internal erosion of embankments due to water flow through the cracks; • They can compromise the efficiency of soil barriers such as landfill liners and top covers. Nowadays, the storage of nuclear waste in deep impermeable geological layers is considered. These storages are based on the multi-barrier principle, the last of which being the host rock, typically a clayey material. In this context, maintaining the very low hydraulic conductivity of the host rock is crucial. Unfortunately, the ventilation of excavated galleries causes convective drying of the host material and can lead to crack formation. This work aims to understand in which conditions exactly, during convective drying, does cracking occur in clayey materials. An experimental campaign has been carried out to characterize the drying behavior of Boom clay which is the host rock at the underground research facility in Mol (Belgium). X-Ray micro-tomography has been used to analyze crack development as well as shrinkage. The experiments are used to calibrate the transfer parameters of a convective drying law based on the limit layer model. This calibration is based on agreement of the drying kinetics. A numerical study is then performed and aims at reproducing the behavior observed during the experiments. A thermo-hydro-mechanical coupled model is used to determine the stress distribution during the drying and a tensile failure criterion is suggested to predict crack genesis. Simulations are performed using the in-house built FEM code LAGAMINE. [less ▲]

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See detailDesiccation-tolerance : an advantage for the biotechnological applications of bacteria
Weekers, F.; Jacques, Ph.; Springael, D. et al

Poster (1999, July)

Detailed reference viewed: 26 (1 ULg)
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See detailDesign aids for the design of steel moment connections
Jaspart, Jean-Pierre ULg

in Proceedings of the 5th International Colloquium on Stability of Metal Structures (1996)

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See detailDesign and analysis of an SOI MEMS voltage step-up converter
Gleeson, R.; Kraft, Michaël ULg; White, N. M.

in Journal of Micromechanics and Microengineering (2013), 23(11), 114017

Detailed reference viewed: 16 (1 ULg)
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See detailDesign and analysis of MEMS step up voltage converters
Gleeson, R.; Kraft, Michaël ULg; White, Neil

in IEEE Sensors 2012 (2012, November)

This paper presents a comprehensive analysis of voltage step-up converters for energy harvesting and other low-power applications. The step-up operation is based on isolating the charge of a mechanically ... [more ▼]

This paper presents a comprehensive analysis of voltage step-up converters for energy harvesting and other low-power applications. The step-up operation is based on isolating the charge of a mechanically variable capacitor and varying the gap between the electrodes by an appropriate method of providing an actuation force i.e. electrostatic or physical. Two devices are presented; a bi-stable device and a resonant device, specifically designed for solar and vibration energy harvesting respectively. The bi-stable device introduces a separate electrostatic actuator element to manipulate the variable capacitor electrodes, whereas, in the case of the resonant device, ambient vibrations provide the necessary actuation force. System-level Multisim models have been developed and verified using 3D FEM Coventorware and MEMS+ simulations. The devices were then fabricated using a dicing-free Silicon-on-Insulator (SOI) process developed at the Southampton Nanofabrication Centre. [less ▲]

Detailed reference viewed: 21 (1 ULg)
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See detailDesign and analysis of SOI MEMS voltage step up converters
Gleeson, R.; Kraft, Michaël ULg; White, N. M.

in Proceedings PowerMEMS 2012 (2012, December)

Detailed reference viewed: 13 (2 ULg)
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See detailDesign and analysis of two types of MEMS DC-DC step up voltage converters
Gleeson, R.; White, N. M.; Kraft, Michaël ULg

in MME 2011: Proceedings (2011)

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Peer Reviewed
See detailDesign and characterization of novel forms of human 16K prolactin, an antiangiogenic factor
Mainfroid, Véronique; Struman, Ingrid ULg; Weiner, Richard I. et al

Poster (1998, January)

Detailed reference viewed: 12 (1 ULg)
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See detailDesign and develoment of a digital transducer
Lewis, CP; Kraft, Michael ULg; Hesketh, TG

in Proc. AEROTECH 95 (1995)

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See detailDesign and development of new polyamides by ring-opening polymerization for high performance composite materials
Tunc, Deniz; Carlotti, Stéphane; Lecomte, Philippe ULg et al

Poster (2013, May 16)

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See detailDesign and dimensioning of hydrogen transmission pipeline networks
de Wolf, Daniel ULg

in European Journal of Operational Research (2013), 229(1), 239-251

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See detailDesign and evaluation of a semantic enrichment process for bibliographic databases
Lacasta, Javier; Nogueras-Iso, Javier; Falquet, Gilles et al

in Data & Knowledge Engineering (2013), 88

The limited semantics of thesauri and similar knowledge models hinder the searching and browsing possibilities of the bibliographic databases classified with this type of resources. This work proposes an ... [more ▼]

The limited semantics of thesauri and similar knowledge models hinder the searching and browsing possibilities of the bibliographic databases classified with this type of resources. This work proposes an automatic process to convert a knowledge model into a domain ontology through the alignment with DOLCE, an upper level ontology. This process is facilitated by an intermediary alignment with Wordnet, a lexical model. The process has been tested with the thesauri and bibliographic databases of Urbamet and the European Urban Knowledge Network. The Urbamet model has been used to create an atlas of urban related resources with advanced search capabilities. [less ▲]

Detailed reference viewed: 37 (8 ULg)