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
See detailFormes quandratiques quaternaires
Pays, Isabelle ULg

Conference (1992, May)

Detailed reference viewed: 7 (0 ULg)
Full Text
Peer Reviewed
See detailFormic acid above the Jungfraujoch during 1985–2007: observed variability, seasonality, but no long-term background evolution
Zander, Rodolphe ULg; Duchatelet, Pierre ULg; Mahieu, Emmanuel ULg et al

in Atmospheric Chemistry and Physics (2010), 10(20), 10047--10065

This paper reports on daytime total vertical column abundances of formic acid (HCOOH) above the Northern mid-latitude, high altitude Jungfraujoch station (Switzerland; 46.5° N, 8.0° E, 3580 m alt.). The ... [more ▼]

This paper reports on daytime total vertical column abundances of formic acid (HCOOH) above the Northern mid-latitude, high altitude Jungfraujoch station (Switzerland; 46.5° N, 8.0° E, 3580 m alt.). The columns were derived from the analysis of infrared solar observations regularly performed with high spectral resolution Fourier transform spectrometers during over 1500 days between September 1985 and September 2007. The investigation was based on the spectrometric fitting of five spectral intervals, one encompassing the HCOOH ν6 band Q branch at 1105 cm−1, and four additional ones allowing to optimally account for critical temperature-sensitive or time-evolving interferences by other atmospheric gases, in particular HDO, CCl2F2 and CHClF2. The main results derived from the 22 years long database indicate that the free tropospheric burden of HCOOH above the Jungfraujoch undergoes important short-term daytime variability, diurnal and seasonal modulations, inter-annual anomalies, but no significant long-term background change. A major progress in the remote determination of the atmospheric HCOOH columns reported here has resulted from the adoption of new, improved absolute spectral line intensities for the infrared ν6 band of trans-formic acid, resulting in retrieved free tropospheric loadings being about a factor two smaller than if derived with previous spectroscopic parameters. Implications of this significant change with regard to earlier remote measurements of atmospheric formic acid and comparison with relevant Northern mid-latitude findings, both in situ and remote, will be assessed critically. Sparse HCOOH model predictions will also be evoked and assessed with respect to findings reported here. [less ▲]

Detailed reference viewed: 35 (11 ULg)
Full Text
Peer Reviewed
See detailForming Forces in Single Point Incremental Forming, Prediction by Finite Element Simulations
Henrard, Christophe; Bouffioux, Chantal ULg; Eyckens, P. et al

in Computational Mechanics (2010)

The aim of this article is to study the accuracy of the nite element simulations to predict the tool force during the Single Point Incremental Forming process. The forming of two cones in soft aluminum ... [more ▼]

The aim of this article is to study the accuracy of the nite element simulations to predict the tool force during the Single Point Incremental Forming process. The forming of two cones in soft aluminum was studied with two Finite Element (FE) codes and several constitutive laws (an elastic-plastic model coupled with different hardening approaches). The parameters of these laws were identi ed using tensile and shear tests, as well as an inverse approach taking into account a test similar to the incremental forming process. Comparisons between measured and predicted force values are performed. This article shows that three factors have an in uence on the force prediction: the type of nite element, the constitutive law and the identi cation procedure for the material parameters. In addition, it con rms that a very detailed description of the behavior occurring across the thickness of the metal sheet is crucial for an accurate force prediction by FE simulations, even though a simple analytical formula could provide an otherwise acceptable answer. [less ▲]

Detailed reference viewed: 146 (51 ULg)
Full Text
Peer Reviewed
See detailForming forces in single point incremental forming: prediction by finite element simulations, validation and sensitivity
Henrard, Christophe; Bouffioux, Chantal ULg; Eyckens, P. et al

in Computational Mechanics (2011), 47

The aim of this article is to study the accuracy of finite element simulations in predicting the tool force occurring during the single point incremental forming (SPIF) process. The forming of two cones ... [more ▼]

The aim of this article is to study the accuracy of finite element simulations in predicting the tool force occurring during the single point incremental forming (SPIF) process. The forming of two cones in soft aluminum was studied with two finite element (FE) codes and several constitutive laws (an elastic–plastic law coupled with various hardening models). The parameters of these laws were identified using several combinations of a tensile test, shear tests, and an inverse modeling approach taking into account a test similar to the incremental forming process. Comparisons between measured and predicted force values are performed. This article shows that three factors have an influence on force prediction: the type of finite element, the constitutive law and the identification procedure for the material parameters. In addition, it confirms that a detailed description of the behavior occurring across the thickness of the metal sheet is crucial for an accurate force prediction by FE simulations, even though a simple analytical formula could provide an otherwise acceptable answer. [less ▲]

Detailed reference viewed: 108 (31 ULg)
Full Text
Peer Reviewed
See detailForming limit predictions for single-point incremental sheet metal forming
Van Bael, A.; Eyckens, P.; He, S. et al

in Cueto, Elías; Chinesta, Francisco (Eds.) Proceedings of the 10th International ESAFORM Conference on Material Forming (2007)

A characteristic of incremental sheet metal forming is that much higher deformations can be achieved than conventional forming limits. In this paper it is investigated to which extent the highly non ... [more ▼]

A characteristic of incremental sheet metal forming is that much higher deformations can be achieved than conventional forming limits. In this paper it is investigated to which extent the highly non-monotonic strain paths during such a process may be responsible for this high formability. A Marciniak-Kuczynski (MK) model is used to predict the onset of necking of a sheet subjected to the strain paths obtained by finite-element simulations. The predicted forming limits are considerably higher than for monotonic loading, but still lower than the experimental ones. This discrepancy is attributed to the strain gradient over the sheet thickness, which is not taken into account in the currently used MK model. [less ▲]

Detailed reference viewed: 72 (6 ULg)
Full Text
See detailForms and Functions in Ancient Egyptian: A short introduction
Grossman, Eitan; Polis, Stéphane ULg

in Grossman, Eitan; Polis, Stéphane; Stauder, Andréas (Eds.) et al On Forms and Functions: Studies in Ancient Egyptian Grammar (2014)

Detailed reference viewed: 14 (1 ULg)
Peer Reviewed
See detailForms and functions of accentuation in Dutch, French, and English
Rasier, Laurent ULg

Conference (2006)

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailFormula-based estimates of the GFR: equations variable and uncertain.
Delanaye, Pierre ULg; Cohen, Eric P.

in Nephron. Clinical Practice (2008), 110(1), 48-5354

Regarding the prevalence of chronic kidney disease in the population, estimation of glomerular filtration rate is of importance. Creatinine-based formulas are thus useful as the first step of a prevention ... [more ▼]

Regarding the prevalence of chronic kidney disease in the population, estimation of glomerular filtration rate is of importance. Creatinine-based formulas are thus useful as the first step of a prevention strategy. Several creatinine-based formulas have been published. Among these, the Cockcroft-Gault formula and the Modification of Diet in Renal Disease (MDRD) study equation are the most used by physicians. The latter may be automatically reported by laboratories and has thus great success. However, these formulas have limitations. First, the MDRD formulas are not applicable to all populations, notably the healthy one and the patients with abnormal weight (anorectic or obese). Second, we evoke the limitations in the precision of the formulas linked to analytical aspects. Indeed, these analytical limitations remain significant even if they are improved by creatinine standardization. Lastly, we briefly mention the potential impact of these limitations on the epidemiology and the staging of chronic kidney disease. [less ▲]

Detailed reference viewed: 50 (8 ULg)
Full Text
Peer Reviewed
See detailLe formulaire thérapeutique : Mythes et réalités
Van Hees, Thierry ULg

Conference (2011, May)

Detailed reference viewed: 6 (2 ULg)
Peer Reviewed
See detailFormulation and characterisation of submicronic emulsions
Roland, Isabelle ULg; Evrard, Brigitte ULg; Erpicum, Thomas et al

Conference (2001)

Detailed reference viewed: 9 (3 ULg)
Full Text
See detailFormulation and integrated use of two antagonistic yeasts to postharvest treatments against diseases on apples
Jijakli, Haissam ULg; Choutka, C.; Lepoivre, Philippe ULg

in Proceedings of an EC Workshop: Biological control of fruit and Foliar diseases (1993)

Detailed reference viewed: 17 (1 ULg)
See detailFormulation d'un additif alimentaire contenant les premiers acides aminés limitants chez le taurillon BBBc nourri avec de l'ensilage de maïs : quelle incidence sur ses performances zootechniques
Rondia, Pierre; Froimont, Eric; Decruyenaere, Virginie et al

in CRA-W; FUSAG (Eds.) 12ème Carrefour des productions animales, "Le marché de la viande bovine : enjeux et perspectives" (2007, January 24)

Detailed reference viewed: 6 (0 ULg)
See detailFormulation d'un projet de recherche : à propos du discours des « Nouveaux Réactionnaires »
Durand, Pascal ULg; Sindaco, Sarah ULg

Scientific conference (2013, November 28)

Les années 1990-2000 ont été marquées, en France, par l'émergence d'un courant de pensée et d'une nébuleuse d'acteurs intellectuels communément rassemblés sous l'étiquette des « Nouveaux Réactionnaires » ... [more ▼]

Les années 1990-2000 ont été marquées, en France, par l'émergence d'un courant de pensée et d'une nébuleuse d'acteurs intellectuels communément rassemblés sous l'étiquette des « Nouveaux Réactionnaires » (tels que Pascal Bruckner, Alain Finkielkraut, Alexandre Adler, Philippe Muray, Jean Clair, Éric Zemmour, Michel Houellebecq, etc.). Journalistes, romanciers, essayistes, chroniqueurs, philosophes, affichant une posture de refus à l'égard du politiquement correct, de la gauche morale et de la pensée unique, ils forment une sorte de personnage générique, composé de singularités en rupture avec toute assignation sociologique. Le projet de recherche entend dresser le tableau raisonné de ce collectif dispersé, sous les deux rapports d'une sociographie de groupe et d'une analyse rhétorique de leur discours ; il entend aussi mettre à l'épreuve différentes hypothèses explicatives sur l'émergence historique et politique du phénomène. [less ▲]

Detailed reference viewed: 75 (15 ULg)