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See detailThe new solar abundances - Part II: the crisis and possible solutions
Montalban Iglesias, Josefa ULg; Miglio, Andrea ULg; Theado, S. et al

in Communications in Asteroseismology (2006), 147

Recent 3D, NLTE analysis of the solar spectrum (Asplund et al. 2006, Part I; Asplund et al. 2005) have led to a significant reduction of the CNO and Ne abundances leading to a (Z/X) 30% smaller than the ... [more ▼]

Recent 3D, NLTE analysis of the solar spectrum (Asplund et al. 2006, Part I; Asplund et al. 2005) have led to a significant reduction of the CNO and Ne abundances leading to a (Z/X) 30% smaller than the previously recommended value. The corresponding decrease in opacity increases dramatically the discrepancies between the sound-speed derived from helioseismology and our new standard solar models (SSM). We present in this paper some numerical experiments trying to reduce this discrepancy. [less ▲]

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See detailNew Solid-Shell Finite Element Based on EAS and ANS Concepts for Sheet Metal Forming
Ben Bettaieb, Amine ULg; Duchene, Laurent ULg; Zhang, Lihong ULg et al

in AIP Conference Proceedings (2011), 1383

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See detailA New solution to the Dyson-Schwinger equation for the gluon propagator
Cudell, Jean-René ULg

in Nucl. Phys. Proc. Suppl. (1992), 25B

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See detailNew Solutions to the Problem of Range Dependence in Bistatic STAP Radars
Lapierre, Fabian; Van Droogenbroeck, Marc ULg; Verly, Jacques ULg

in IEEE Radar Conference 2003, Proceedings (2003, May)

We address the problem of detecting slow-moving <br />targets using a space-time adaptive processing (STAP) radar. <br />The construction of optimum weights at each range implies <br />the estimation of ... [more ▼]

We address the problem of detecting slow-moving <br />targets using a space-time adaptive processing (STAP) radar. <br />The construction of optimum weights at each range implies <br />the estimation of the clutter covariance matrix. This is typically <br />done by straight averaging of neighboring data snapshots. <br />However, in bistatic configurations, these snapshots are rangedependent. <br />As a result, straight averaging results in poor performance. <br />After reviewing existing methods for handling the <br />range-dependence, we present new methods exploiting the precise <br />shape of the bistatic direction-Doppler curves. [less ▲]

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See detailA new spatial thin-walled beam finite element for tapered members
Boissonnade, N.; Degée, Hervé ULg

in Proceedings of the National Conference on Theoretical and Applied Mechanics (2006)

This paper presents the essentials of an original geometrically and materially non-linear 3-D tapered beam finite element. The theoretical bases of the element are described, with particular attention ... [more ▼]

This paper presents the essentials of an original geometrically and materially non-linear 3-D tapered beam finite element. The theoretical bases of the element are described, with particular attention paid to the choice of an appropriate displacement field and to the corresponding non-linear axial strains. Specific numerical problems met in the development of the finite element are examined, concerning mainly shear and membrane locking and the handling of rigid body motions. Worked examples on isolated members are presented for various types of analyses: elastic linear, elastic critical and geometrically and materially non-linear analyses. Good accuracy with reference to numerical results is shown, as well as good convergence properties. It is also demonstrated – analytically and numerically – that the use of prismatic beam finite elements for the analysis of tapered beams (segmentation technique) may lead to significant discrepancies when the behaviour is influenced by torsional aspects. [less ▲]

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See detailA new species of Caprella (Crustacea: Amphipoda) from the Mediterranean Sea
Sturaro, Nicolas ULg; Guerra-García, José Manuel

in Helgoland Marine Research (2012)

A new caprellid amphipod, Caprella tavolarensis n. sp., is described based on specimens collected from a Posidonia oceanica seagrass meadow at the Tavolara- Punta Coda Cavallo Marine Protected Area ... [more ▼]

A new caprellid amphipod, Caprella tavolarensis n. sp., is described based on specimens collected from a Posidonia oceanica seagrass meadow at the Tavolara- Punta Coda Cavallo Marine Protected Area (Sardinia, Mediterranean Sea). The species is close to Caprella liparotensis, but can be clearly distinguished by smaller size, presence of a short rostrum, body elongate and dorsally smooth, absence of serrate carina on the basis of gnathopod 2 and pereopods, mouthparts scarcely setose, absence of Wne setae on peduncle of antenna 1 and absence of swimming setae on antenna 2. The number of caprellid species reported from the Mediterranean Sea has increased from 23 (1993) to 41 (2010), consequently, further taxonomical studies should be addressed to properly estimate the total amphipod diversity in the Mediterranean Sea. [less ▲]

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See detailA new species of Groenlandaspis Heintz, 1932 (Placodermi, Arthrodira) from the Famennian (Late Devonian) of Belgium
Olive, Sébastien ULg; Prestianni, Cyrille; Dupret, Vincent

in Journal of Vertebrate Paleontology (2015), 35(5),

A new species of the phlyctaeniid arthrodire genus Groenlandaspis from the upper Famennian of Belgium is described. The remains of Groenlandaspis potyi sp. nov. consist of dissociated thoracic armor ... [more ▼]

A new species of the phlyctaeniid arthrodire genus Groenlandaspis from the upper Famennian of Belgium is described. The remains of Groenlandaspis potyi sp. nov. consist of dissociated thoracic armor elements, but the specimen designed to be the holotype displays the median dorsal, anterior and posterior dorsolateral plates in connection. Though incomplete, the new species is characterized by an equilateral triangle-shaped median dorsal plate, a protruding posterodorsal apron of the posterior dorsolateral plate behind the overlap area for the median dorsal plate, and an overall lack of ornamentation. Groenlandaspis potyi sp. nov. constitutes the second occurrence of a Groenlandaspis species in continental Europe after the description of Groenlandaspis thorezi from upper Famennian quarries of Belgium. Another probable new species of Groenlandaspis is also described, though of unknown locality and horizon; it can however be deduced from the upper Famennian of Belgium without more precision. Together with some unpublished material of groenlandaspidids from the Famennian tetrapod-bearing locality of Strud, this material highlights the richness of the Groenlandaspididae diversity in Belgium. The discovery of Groenlandaspis potyi sp. nov. in Belgium reinforces the Famennian global distribution of this widespread genus during this period. Also, since those organisms have possibly been considered as non-marine indicators, this material is another argument pleading for close relationships between Euramerica and Gondwana around the Frasnian-Famennian boundary. [less ▲]

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See detailA new species of Lecanactis (Arthoniales, Roccellaceae) from Madagascar
Ertz, Damien; Sérusiaux, Emmanuël ULg

in Lichenologist (2009), 41

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See detailA new species of Melanotopelia (Graphidaceae) from Africa
Sérusiaux, Emmanuël ULg; Brand, Maarten; Fischer, Eberhard et al

in Lichenologist (2009), 41(3), 243-247

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See detailA new species of trametes from Papua New Guinea
Castillo Cabello, Gabriel ULg

in Mycotaxon (1994)

Trametes demoulinii from Papua New guinea is descrebed as new. The new taxon is closest to Trametes conchifer and Trametes membranacea, both from America and Trametes cingulata know in Africa and East ... [more ▼]

Trametes demoulinii from Papua New guinea is descrebed as new. The new taxon is closest to Trametes conchifer and Trametes membranacea, both from America and Trametes cingulata know in Africa and East Asia. In addition to basidiomata, cultural characters of the new species are described. [less ▲]

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See detailNew specific inhibitors of human leukocyte elastase
Doucet, C.; Pochet, L.; Thierry, N. et al

Poster (1998, July)

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See detailNew spillway at the Esch-sur-Sûre dam in Luxembourg
Lazaro, Philippe; Toussin, Guy; Didier, Gilles et al

in Wasserwirtschaft (2007), 10

The 50-m high arch dam of Esch-sur-Sûre, built on the river Sûre between 1956 and 1957, is located 1.2 km upstream of the town of esch-sur-Sûre in the north west of Luxembourg. As the dam is not equipped ... [more ▼]

The 50-m high arch dam of Esch-sur-Sûre, built on the river Sûre between 1956 and 1957, is located 1.2 km upstream of the town of esch-sur-Sûre in the north west of Luxembourg. As the dam is not equipped with a surface spillway, the construction of a new one is considered necessary. The new spillway design with a discharge capacity of 400 m³/s consists in building two labyrinth weirs discharging into a spillway tunnel passing under the left dam abutment. [less ▲]

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See detailA new spore assemblage to correlate between the Breconian (British Isles) and the Gedinnian (Belgium)
Richardson, JB; Streel, Maurice ULg; Hassan, A et al

in Annales de la Société Géologique de Belgique (1982), 105

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See detailNew Standard Formulation for Neonatal Parenteral Nutrition.
SENTERRE, Thibault ULg

in Congress of the Portuguese Neonatal Society (2012, May)

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See detailA New State of Turbulence: Elasto-Inertial Turbulence
Dubief, Yves; Samanta, Devranjan; Holzner, Markus et al

Conference (2012, November 20)

The elasticity of polymer solutions is found to generate a new state of turbulence, elasto-inertial turbulence (EIT), characterized by an interplay between elastic and flow instabilities. Experiments and ... [more ▼]

The elasticity of polymer solutions is found to generate a new state of turbulence, elasto-inertial turbulence (EIT), characterized by an interplay between elastic and flow instabilities. Experiments and direct numerical simulations (DNS) in pipe and channel flows demonstrate the emergence of EIT at Reynolds numbers much lower than the critical Reynolds number for transition to turbulence in Newtonian flows. EIT causes the friction factor to deviate from the laminar solution and subsequently transition to the maximum drag reduction asymptote around Re=1800. EIT is a self-sustained mechanism that arises from the interactions between fluctuations of extensional viscosity, velocity and pressure. The polymer solution elasticity controls the growth of flow instability, resulting in transitional-like flows at high Reynolds numbers. The existence of EIT is not limited to pipe, channel or boundary layer flows, and evidence of EIT will be discussed in other flows, including natural convection using DNS. [less ▲]

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See detailA new statistical method for evaluating long-term analytical performance of laboratories applied to an external quality assessment scheme for flow cytometry.
Coucke, Wim; Van Blerk, Marjan; Libeer, Jean*-Claude et al

in Clinical Chemistry & Laboratory Medicine (2010), 48(5), 645-50

BACKGROUND: The Belgian External Quality Assessment Scheme for Flow Cytometry evaluates the long-term analytical performance of participating laboratories by calculating a regression line between the ... [more ▼]

BACKGROUND: The Belgian External Quality Assessment Scheme for Flow Cytometry evaluates the long-term analytical performance of participating laboratories by calculating a regression line between the target and reported values of each parameter for each laboratory during the past 3 years. This study aims to develop a method to find laboratories with aberrant variability or bias using robust techniques and to obtain robust estimates of the variability. METHODS: A method is proposed to find outliers with respect to the individual regression line, followed by a step to find regression lines with excessive variability and finally a step to find regression lines with high bias. RESULTS: The model was applied to the results obtained by 52 laboratories for CD4%. From the 1340 data points, 35 were determined to be regression outliers. The second step revealed one regression line with excessive variability; the third step detected three regression lines with exceeding bias. CONCLUSIONS: The methodology allows assessment of the long-term performance of laboratories, taking into account samples with different target values. Outliers in the first step indicate accidental mistakes, outliers in the second and third step point to high analytical variability or bias. [less ▲]

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See detailA new statistical method for the automated detection of peaks in UV-DAD chromatograms of a sample mixture
Debrus, Benjamin ULg; Lebrun, Pierre ULg; Ceccato, Attilio ULg et al

in Talanta (2009), 79

One of the major issues within the context of the fully automated development of chromatographic methods consists of the automated detection and identification of peaks coming from complex samples such as ... [more ▼]

One of the major issues within the context of the fully automated development of chromatographic methods consists of the automated detection and identification of peaks coming from complex samples such as multi-component pharmaceutical formulations or stability studies of these formulations. The same problem can also occur with plant materials or biological matrices. This step is thus critical and time-consuming, especially when a Design of Experiments (DOE) approach is used to generate chromatograms. The use of DOE will often maximize the changes of the analytical conditions in order to explore an experimental domain. Unfortunately, this generally provides very different and “unpredictable” chromatograms which can be difficult to interpret, thus complicating peak detection and peak tracking (i.e. matching peaks among all the chromatograms). In this context, Independent Components Analysis (ICA), a new statistically based signal processing methods was investigated to solve this problem. The ICA principle assumes that the observed signal is the resultant of several phenomena (known as sources) and that all these sources are statistically independent. Under those assumptions, ICA is able to recover the sources which will have a high probability of representing the constitutive components of a chromatogram. In the present study, ICA was successfully applied for the first time to HPLC–UVDAD chromatograms and it was shown that ICA allows differentiation of noise and artifact components from those of interest by applying clustering methods based on high-order statistics computed on these components. Furthermore, on the basis of the described numerical strategy, itwas also possible to reconstruct a cleaned chromatogram with minimum influence of noise and baseline artifacts. This can present a significant advance towards the objective of providing helpful tools for the automated development of liquid chromatography (LC) methods. It seems that analytical investigations could be shortened when using this type of methodologies. [less ▲]

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See detailNew strategies and new impact of cancer imaging
Couturier, Olivier; Hustinx, Roland ULg; Chatal, Jean-François

in SERVIER, Jacques (Ed.) Cancer : recent evidence, innovative strategies, future promises (2004)

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See detailNew strategies to prepare melt processable polymer-grafted gold nanoparticles
Alexandre, Michaël ULg; Abetz, Volker; Boschetti-de-Fierro, A. et al

Poster (2008, November 28)

Detailed reference viewed: 31 (6 ULg)