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See detailExtreme life on Earth - past, present and possibly beyond
Javaux, Emmanuelle ULg

in Research in Microbiology (2006), 157(1), 37-48

Life may have been present on Earth since about 3.8 billion years ago or earlier. Multidisciplinary research, especially on the paleobiology and evolution of early microorganisms on Earth and the ... [more ▼]

Life may have been present on Earth since about 3.8 billion years ago or earlier. Multidisciplinary research, especially on the paleobiology and evolution of early microorganisms on Earth and the microbiology of extremophiles in the Earth's environments and under space conditions, enables the defining of strategies for the detection of potential extraterrestrial life by determining biosignatures and the environmental envelope of life. (C) 2005 Elsevier SAS. All rights reserved. [less ▲]

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See detailExtreme phase sensitivity in systems with fractal isochrons
Mauroy, Alexandre ULg; Mezic, Igor

in Physica D: Nonlinear Phenomena (2015), 308

Sensitivity to initial conditions is usually associated with chaotic dynamics and strange attractors. However, even systems with (quasi)periodic dynamics can exhibit it. In this context we report on the ... [more ▼]

Sensitivity to initial conditions is usually associated with chaotic dynamics and strange attractors. However, even systems with (quasi)periodic dynamics can exhibit it. In this context we report on the fractal properties of the isochrons of some continuous-time asymptotically periodic systems. We define a global measure of phase sensitivity that we call the phase sensitivity coefficient and show that it is an invariant of the system related to the capacity dimension of the isochrons. Similar results are also obtained with discrete-time systems. As an illustration of the framework, we compute the phase sensitivity coefficient for popular models of bursting neurons, suggesting that some elliptic bursting neurons are characterized by isochrons of high fractal dimensions and exhibit a very sensitive (unreliable) phase response. [less ▲]

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See detailThe Extreme Right in Europe : Fascist or Mainstream
Jamin, Jérôme ULg

in The Public Eye (2005), 19/1

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See detailExtreme snowmelt in Northern Greenland during summer 2008
Tedesco, Marco; Fettweis, Xavier ULg; van den Broeke, Michiel et al

in EOS : Transactions, American Geophysical Union (2008), 89(41), 391

Extreme snowmelt occurred during summer 2008 over the northern part of the Greenland ice sheet, according to the analysis of microwave data recorded by the Special Sensor Microwave Imager (SSM/I) on board ... [more ▼]

Extreme snowmelt occurred during summer 2008 over the northern part of the Greenland ice sheet, according to the analysis of microwave data recorded by the Special Sensor Microwave Imager (SSM/I) on board the F13 satellite of the U.S. Defense Meteorological Satellite Program (DMSP). New records of the number of melting days were also observed over large portions of the same areas (letters A and B in Figure 1). [less ▲]

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See detailExtreme thrombocytosis in a child with cow's milk protein allergy
THIRION, S.; FERNANDEZ, J.; HARDY, P. et al

Conference (2014, June)

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See detailTHE EXTREME ULTRAVIOLET IMAGER (EUI) ONBOARD THE SOLAR ORBITER MISSION
Rochus, Pierre ULg; Halain, Jean-Philippe ULg; Renotte, Etienne ULg et al

in A3. 4. Space-based Astronomy (2009)

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See detailThe extreme ultraviolet imager of solar orbiter: optical design and alignment scheme
Halain, Jean-Philippe ULg; Mazzoli, Alexandra ULg; Meining, S. et al

in SPIE Optical Engineering+ Applications (2015)

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See detailThe Extreme UV Imager of Solar Orbiter – From detailed design to Flight Model
Halain, Jean-Philippe ULg; Rochus, Pierre ULg; Renotte, Etienne ULg et al

in Proceedings of SPIE - The International Society for Optical Engineering - Space Telescopes and Instrumentation 2014: Ultraviolet to Gamma Ray (2014), SPIE 9144-7

The Extreme Ultraviolet Imager (EUI) on-board the Solar Orbiter mission will provide full-sun and high-resolution image sequences of the solar atmosphere at selected spectral emission lines in the extreme ... [more ▼]

The Extreme Ultraviolet Imager (EUI) on-board the Solar Orbiter mission will provide full-sun and high-resolution image sequences of the solar atmosphere at selected spectral emission lines in the extreme and vacuum ultraviolet. After the breadboarding and prototyping activities that focused on key technologies, the EUI project has completed the design phase and has started the final manufacturing of the instrument and its validation. The EUI instrument has successfully passed its Critical Design Review (CDR). The process validated the detailed design of the Optical Bench unit and of its sub-units (entrance baffles, doors, mirrors, camera, and filter wheel mechanisms), and of the Electronic Box unit. In the same timeframe, the Structural and Thermal Model (STM) test campaign of the two units have been achieved, and allowed to correlate the associated mathematical models. The lessons learned from STM and the detailed design served as input to release the manufacturing of the Qualification Model (QM) and of the Flight Model (FM). The QM will serve to qualify the instrument units and sub-units, in advance of the FM acceptance tests and final on-ground calibration. [less ▲]

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See detailExtreme-right discourse in Belgium: a comparative regional approach
Jamin, Jérôme ULg

in Mammone, Andrea; Godin, Emmanuel; Jenkins, Brian (Eds.) Mapping the Extreme Right in Contemporary Europe: From Local to Transnational (2012)

In recent years the revival of the far right and anti-Semitic, racist and fascist organizations has posed a significant threat throughout Europe. Mapping the Extreme Right in Contemporary Europe provides ... [more ▼]

In recent years the revival of the far right and anti-Semitic, racist and fascist organizations has posed a significant threat throughout Europe. Mapping the Extreme Right in Contemporary Europe provides a broad geographical overview of the dominant strands within the contemporary radical right in both Western and Eastern Europe. After providing some local and regional perspectives, the book has a series of national case studies of particular countries and regions including: Austria, Belgium, Bosnia-Herzegovina, Croatia, Eastern Europe, France, Germany, Greece, Italy, Malta, Portugal, Romania, Scandinavia, Serbia, Spain, Switzerland, Turkey, Ukraine and the United Kingdom. A series of thematic chapters examine transnational phenomena such as the use of the Internet, the racist music scene, cultural transfers and interaction between different groups. Drawing together a wide range of contributors, this is essential reading for all those with an interest in contemporary extremism, fascism and comparative party politics. [less ▲]

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See detailThe Extreme-Right in Western Europe : a Reevaluation
Martiniello, Marco ULg

Scientific conference (2000, October 25)

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See detailExtremely Organic-rich Coma of Comet C/2010 G2 (Hill) during its Outburst in 2012
Kawakita, Hideyo; Dello Russo, Neil; Vervack, Ron et al

in Astrophysical Journal (2014), 788

We performed high-dispersion near-infrared spectroscopic observations of comet C/2010 G2 (Hill) at 2.5 AU from the Sun using NIRSPEC (R ≈ 25,000) at the Keck II Telescope on UT 2012 January 9 and 10 ... [more ▼]

We performed high-dispersion near-infrared spectroscopic observations of comet C/2010 G2 (Hill) at 2.5 AU from the Sun using NIRSPEC (R ≈ 25,000) at the Keck II Telescope on UT 2012 January 9 and 10, about a week after an outburst had occurred. Over the two nights of our observations, prominent emission lines of CH[SUB]4[/SUB] and C[SUB]2[/SUB]H[SUB]6[/SUB], along with weaker emission lines of H[SUB]2[/SUB]O, HCN, CH[SUB]3[/SUB]OH, and CO were detected. The gas production rate of CO was comparable to that of H[SUB]2[/SUB]O during the outburst. The mixing ratios of CO, HCN, CH[SUB]4[/SUB], C[SUB]2[/SUB]H[SUB]6[/SUB], and CH[SUB]3[/SUB]OH with respect to H[SUB]2[/SUB]O were higher than those for normal comets by a factor of five or more. The enrichment of CO and CH[SUB]4[/SUB] in comet Hill suggests that the sublimation of these hypervolatiles sustained the outburst of the comet. Some fraction of water in the inner coma might exist as icy grains that were likely ejected from nucleus by the sublimation of hypervolatiles. Mixing ratios of volatiles in comet Hill are indicative of the interstellar heritage without significant alteration in the solar nebula. [less ▲]

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See detailExtremely randomized trees
Geurts, Pierre ULg; Ernst, Damien ULg; Wehenkel, Louis ULg

in Machine Learning (2006), 63(1), 3-42

This paper proposes anew tree-based ensemble method for supervised classification and regression problems. It essentially consists of randomizing strongly both attribute and cut-point choice while ... [more ▼]

This paper proposes anew tree-based ensemble method for supervised classification and regression problems. It essentially consists of randomizing strongly both attribute and cut-point choice while splitting a tree node. In the extreme case, it builds totally randomized trees whose structures are independent of the output values of the learning sample. The strength of the randomization can be tuned to problem specifics by the appropriate choice of a parameter. We evaluate the robustness of the default choice of this parameter, and we also provide insight on how to adjust it in particular situations. Besides accuracy, the main strength of the resulting algorithm is computational efficiency. A bias/variance analysis of the Extra-Trees algorithm is also provided as well as a geometrical and a kernel characterization of the models induced. [less ▲]

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See detailExtremely Randomized Trees and Random Subwindows for Image Classification, Annotation, and Retrieval
Marée, Raphaël ULg; Wehenkel, Louis ULg; Geurts, Pierre ULg

in Criminisi, A; Shotton, J (Eds.) Decision Forests in Computer Vision and Medical Image Analysis, Advances in Computer Vision and Pattern Recognition (2013)

We present a unified framework involving the extraction of random subwindows within images and the induction of ensembles of extremely randomized trees. We discuss the specialization of this framework for ... [more ▼]

We present a unified framework involving the extraction of random subwindows within images and the induction of ensembles of extremely randomized trees. We discuss the specialization of this framework for solving several general problems in computer vision, ranging from image classification and segmentation to content-based image retrieval and interest point detection. The methods are illustrated on various applications and datasets from the biomedical domain [less ▲]

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See detailExtremely Unstable Evaporative Bénard-Marangoni Systems: the Role of Transients in the Gas
Rednikov, Alexey; Machrafi, Hatim ULg; Dauby, Pierre ULg et al

in Book of Conference Abstracts of the International Marangoni Association, 6 (2012)

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See detailThe extremist persuasion
Jamin, Jérôme ULg

Scientific conference (2008)

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See detailExtremophiles
Berlemont, Renaud ULg; Gerday, Charles ULg

in Comprehensive Biotechnology (2010)

Extremophiles are organisms which inhabit environments characterized by properties harsh enough to hinder the survival of common cells. They are highly diversified and are classified on the basis of the ... [more ▼]

Extremophiles are organisms which inhabit environments characterized by properties harsh enough to hinder the survival of common cells. They are highly diversified and are classified on the basis of the main extreme property that prevails in the habitat. Six main categories can be distinguished: the thermophiles found in high temperature sites and which can tolerate temperatures sometimes close to that of the boiling point of water; the psychrophiles living in permanently cold habitats with temperatures sometimes well below the freezing point of water; the piezophiles, which tolerate pressure as high as 1000 atm; the halophiles supporting salt concentrations, in some cases, higher than 300gl–1; the acidophiles thriving well at pH sometimes close to zero; and the alkaliphiles, which, on the contrary, tolerate pH largely exceeding neutrality. These organisms are mainly microorganisms and they notably produce enzymes that are adapted to work in unusual conditions often required in biotechnological processes. This confers upon these organisms a very high potential. They are the target of a steadily increasing interest and are nowadays largely used in various industrial applications. [less ▲]

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See detailExtremophiles, early Earth biosphere and exobiology
Javaux, Emmanuelle ULg; Marshall, C.

Poster (2004)

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See detailExtrusion foaming of poly(styrene-co-acrylonitrile)/ clay nanocomposites using supercritical CO2
Urbanczyk, Laetitia; Alexandre, Michaël ULg; Detrembleur, Christophe ULg et al

in Macromolecular Materials and Engineering (2010), 295(10), 915-

Supercritical CO2 has been used as a blowing agent to foam poly(styrene-co-acrylonitrile)-based materials in a single screw extruder specially adapted to allow fluid injection. The cellular morphology ... [more ▼]

Supercritical CO2 has been used as a blowing agent to foam poly(styrene-co-acrylonitrile)-based materials in a single screw extruder specially adapted to allow fluid injection. The cellular morphology depends on foaming temperature, more regular cells being obtained with decreasing extrusion temperature. In a second step, a natural and an organomodified nanoclay have been added for the purpose of imparting some flame resistance to the foamed material. The filler efficiency in reducing sample combustion rate appeared to be dependent on its delamination level inside the matrix and better results were obtained when the organomodified clay was first delaminated in the polymer in an efficient twin screw extruder using water assistance, prior to foaming in the single screw extruder. [less ▲]

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