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See detailPrécision des échantillonnages relatifs à la répartition des arbres par catégories de grosseur.
Grayet, J.-P.; Rondeux, Jacques ULg

Book published by Faculté des Sciences Agronomiques (1980)

The precision of samplings which concern the distribution of trees by girth classes is studied in various forest types (unevenaged and evenaged hardwood stands, evenaged coniferous stands). When sampling ... [more ▼]

The precision of samplings which concern the distribution of trees by girth classes is studied in various forest types (unevenaged and evenaged hardwood stands, evenaged coniferous stands). When sampling intensities of 1 to 10 % (plots of 10 ares), the estimated semi confidence intervals at a 95 % probability level are varying from 10 to 2 %. In coniferous forests (plots of 4 ares) for the same area limits and sampling intensities the semi confidence intervals are varying from 4 to 1 %. [less ▲]

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See detailPrécision des valeurs estimées à l'aide de tarifs de cubage d'arbres
Palm, Rodolphe ULg

in Annales des Sciences Forestières (1983), 40(3), 299-308

La précision du volume estimé d'un ensemble d'arbres à partir d'une équation de cubage dépend essentiellement de la variation résiduelle, de la variation liée à l'équation de cubage, du nombre et de la ... [more ▼]

La précision du volume estimé d'un ensemble d'arbres à partir d'une équation de cubage dépend essentiellement de la variation résiduelle, de la variation liée à l'équation de cubage, du nombre et de la répartition en catégories de grosseurs des arbres à cuber. L'importance relative de ces différents facteurs a été étudiée, d'une part, en fonction des caractéristiques de l'échantillon utilisé pour la construction du tarif et, d'autre part, en fonction des caractéristiques de l'ensemble d'arbres dont on estime le volume. [less ▲]

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See detailPrecision design of ethylene- and polar-monomer-based copolymers by organometallic-mediated radical polymerization
Kermagoret, Anthony ULg; Debuigne, Antoine ULg; Jérôme, Christine ULg et al

in Nature Chemistry (2014), 6(3), 179-187

The copolymerization of ethylene with polar monomers is a major challenge when it comes to the manufacture of materials with potential for a wide range of commercial applications. In the chemical industry ... [more ▼]

The copolymerization of ethylene with polar monomers is a major challenge when it comes to the manufacture of materials with potential for a wide range of commercial applications. In the chemical industry, free-radical polymerization is used to make a large proportion of such copolymers, but the forcing conditions result in a lack of fine control over the architecture of the products. Herein we introduce a synthetic tool, effective under mild experimental conditions, for the precision design of unprecedented ethylene- and polar-monomer-based copolymers. We demonstrate how an organocobalt species can control the growth of the copolymer chains, their composition and the monomer distribution throughout the chain. By fine tuning the ethylene pressure during polymerization and by exploiting a unique reactive mode of the end of the organometallic chain, novel block-like copolymer structures can be prepared. This highly versatile synthetic platform provides access to a diverse range of polymer materials. [less ▲]

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See detailPrécision du positionnement par satellites: influence de la géométrie de la constellation
Lonchay, Matthieu ULg

Master's dissertation (2009)

Precision of GNSS (Global Navigation Satellite System) is affected by a lot of different factors, such as satellite geometry. The quality of satellite geometry is evaluated by an indicator: DOP (Dilution ... [more ▼]

Precision of GNSS (Global Navigation Satellite System) is affected by a lot of different factors, such as satellite geometry. The quality of satellite geometry is evaluated by an indicator: DOP (Dilution Of Precision). Specific satellite geometry, such as conical satellite geometry, are able to strongly harm to the precision of positioning. These particular situations lead the normal matrix to a singular state and the DOP to high values. [less ▲]

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See detailPrécision du positionnement par satellites: influence de la géométrie de la constellation
Lonchay, Matthieu ULg

Conference (2010, February 24)

De nombreux facteurs sont susceptibles d’influencer la précision des systèmes globaux de positionnement et de navigation par satellites (GNSS, Global Navigation Satellite System), dont la géométrie de la ... [more ▼]

De nombreux facteurs sont susceptibles d’influencer la précision des systèmes globaux de positionnement et de navigation par satellites (GNSS, Global Navigation Satellite System), dont la géométrie de la constellation. La qualité de la géométrie de la constellation s’évalue au moyen d’un indicateur : le DOP (Dilution Of Precision). Certaines formes très particulières de la géométrie de la constellation nuisent de manière importante à la précision du positionnement par satellites. C’est le cas de la constellation de forme conique. Ces situations particulières se caractérisent par un état singulier de la matrice normale et de hautes valeurs du DOP. [less ▲]

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See detailPrécision fonctionnelle du schéma de structure communal
Collette, Jean-Pierre ULg; Goossens, Marc ULg; Hanocq, Philippe ULg

in Environnement et Société (1992), 9/10

Examen comparé des notions de "fonctions" et de "densités" dans les divers documents planologiques élaborés à différentes échelles territoriales.

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See detailPrecision of continuous neonatal ventilator respiratory mechanics is improved with selected optimal respiratory cycles.
RIGO, Vincent ULg; Graas, Estelle; RIGO, Jacques ULg

in European journal of pediatrics (2012), 171(4), 689-96

Given their high apparent variability, bedside continuous respiratory mechanics (RM) parameters (excepting tidal volume (VT)) remain infrequently used for adjustment of neonatal ventilatory settings. RM ... [more ▼]

Given their high apparent variability, bedside continuous respiratory mechanics (RM) parameters (excepting tidal volume (VT)) remain infrequently used for adjustment of neonatal ventilatory settings. RM parameters provided by ventilator (VRC) from 10 recordings of newborns (10 minutes in synchronized intermittent mandatory ventilation and Assist/control (A/C)) were compared to those computed from visually selected assisted leak-free optimal respiratory cycles (SRC). Mean values, variability and ability to distinguish patients were compared between VRC and SRC. Dynamic resistances were more correlated (r²=0.95) than compliances (r²=0.42). VT’s were correlated only in A/C (r²=0.78). C20/C was significantly higher in VRC (1.81±0.67) than in SRC (1.23±0.36) and frequently out of neonatal reference range. In A/C ventilation, VT was higher in VRC (5.6 ±1.8 ml/kg) than in SRC (4.8 ±1.0 ml/kg) (p<0.05). Displayed VT’s don’t reflect those found in optimal assisted breaths and therefore have incomplete value in assessing adequacy of ventilator settings. The variability of RM parameters provided by the ventilator is large, and coefficients of variation were significantly lower with optimal respiratory cycles (for Resistance, Compliance, VT and C20/C: 27, 26, 18, 24% in SRC, 36, 35, 40, 33% in VRC). Selecting optimal cycles yields RM with a 2-3 times higher discriminating power between patients. Conclusion: Current ventilator’s RM parameters have limited clinical use. Using optimal breaths to calculate RM parameters improves precision and discriminating power. For integration to ventilatory care, automation of this selection must be implemented first. [less ▲]

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See detailPrecision polymer design by organometallic-mediated radical polymerization
Debuigne, Antoine ULg

Scientific conference (2014, March 13)

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See detailPrecision study on capillary electrophoresis methods for metacycline
Do Thi, Thao; Pomponi, Romeo; Gotti, Roberto et al

in Electrophoresis (2006), 27(12), 2317-2329

A CE method for metacycline (MTC) determination was investigated in an inter-laboratory experiment. Many problems were encountered in this study, most of which were related to the transfer of the method ... [more ▼]

A CE method for metacycline (MTC) determination was investigated in an inter-laboratory experiment. Many problems were encountered in this study, most of which were related to the transfer of the method to different CE equipment. The reported problems could be classified into different categories: problems related to the precision, to the parameters in the protocol, and to the MTC peak shape. As the peak shape problem was partially responsible for the poor precision, a new CE method was developed in order to obtain a good MTC peak shape on all equipment. The precision of this new method for MTC determination was examined in an intermediate precision study, where the influence of the factors "time" and "equipment" was investigated. Although the new method could be transferred to different instruments, the precision remained poor mainly due to the contributions of the between-replicate and the between-injection variances. [less ▲]

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See detailPrecision synthesis of poly(ionic liquid)-based block copolymers by cobalt-mediated radical polymerization and preliminary study of their self-assembling properties
Coupillaud, Paul; Fèvre, Maréva; Wirotius, Anne-Laure et al

in Macromolecular Rapid Communications (2014), 35(4), 422-430

A poly(ionic liquid)-based block copolymer (PIL BCP), namely, poly(vinyl acetate)-b-poly(N-vinyl-3-butylimidazolium bromide), PVAc-b-PVBuImBr, is synthesized by sequential cobalt-mediated radical ... [more ▼]

A poly(ionic liquid)-based block copolymer (PIL BCP), namely, poly(vinyl acetate)-b-poly(N-vinyl-3-butylimidazolium bromide), PVAc-b-PVBuImBr, is synthesized by sequential cobalt-mediated radical polymerization (CMRP). A PVAc precursor is first prepared at 30 °C in bulk by CMRP of VAc, using bis(acetylacetonato)cobalt(II), Co(acac)2, and a radical source (V-70). Growth of PVBuImBr from PVAc-Co(acac)2 is accomplished by CMRP in DMF/MeOH (2:1, v/v). This PIL BCP self-assembles in the sub-micron size range into aggregated core–shell micelles in THF, whereas polymeric vesicles are observed in water, as evidenced by dynamic light scattering (DLS) and transmission electron microscopy (TEM). Thin-solid sample cut from raw materials analyzed by TEM shows an ordered lamellar organization by temperature-dependent synchrotron small-angle X-ray scattering (SAXS). Anion exchange can be accomplished to achieve the corresponding PIL BCP with bis(trifluorosulfonyl)imide (Tf2N−) anions, which also gives rise to an ordered lamellar phase in bulk samples. A complete suppression of SAXS second-order reflection suggests that this compound has a symmetric volume fraction (f ≈ 0.5). SAXS characterization of both di- and triblock PIL BCP analogues previously reported also shows a lamellar phase of very similar behavior, with only an increase of the period by about 8% at 60 °C. [less ▲]

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See detailPrécisions biostratigraphiques relatives au Dévonien Supérieur de Ferques (Boulonnais).
Brice, D; Coen, M; Loboziak, S et al

in Annales de la Société Géologique du Nord (1981), C

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See detailPrécisions conceptuelles et méthodologiques en matière d’éducation au changement climatique.
Semal, Nathalie ULg

Speech (2003)

Cette allocutiona été présentée lors d'une réunion de travail organisée dans le cadre de la Convention des Nations Unies sur le Changement Climatique, dédiée à l'implémentation de son article 6, relatif à ... [more ▼]

Cette allocutiona été présentée lors d'une réunion de travail organisée dans le cadre de la Convention des Nations Unies sur le Changement Climatique, dédiée à l'implémentation de son article 6, relatif à l'éducation et à la sensibilisation du public au réchauffement climatique. Elle tente de développer quelques principes de base, tirés des enseignements des expériences menées en éducation relative à l'environnement. [less ▲]

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See detailLes précisions de la Cour constitutionnelle quant à la nature juridique de la condamnation d'office visée par l'article 35 § 1er aliéna 3 de la loi du 27 juin 1969 concernant la sécurité sociale des travailleurs salariés
Michiels, Olivier ULg

in Revue de la Faculté de Droit de l'Université de Liège (2008), 2008/3

L'article s'attache à définir la nature juridique des condamnations d'office portées par la loi du 27 juin 1969 concernant la sécurité sociale des travailleurs salariés en cas de non-assujetissement ou d ... [more ▼]

L'article s'attache à définir la nature juridique des condamnations d'office portées par la loi du 27 juin 1969 concernant la sécurité sociale des travailleurs salariés en cas de non-assujetissement ou d'assujettissement frauduleux à la sécurité sociale [less ▲]

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See detailPrecisions on the Palynostratigraphy of the Siluro-Devonian boundary in Lybia
Steemans, Philippe ULg; Rubinstein, C. V.; Le Hérissé, A.

Conference (1996)

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See detailPrécisions sur l'Ouverture de cuisine de Lancelot de Casteau, imprimée à Liège en 1604
Adam, Renaud ULg

in De Gulden Passer = Le compas d'or (2012), 90(1), 89-96

Detailed reference viewed: 43 (4 ULg)
See detailPrécisions sur la distribution et l'écologie de quelques Coléoptères de Belgique
Baguette, Michel; Dufrêne, Marc ULg; Lesuisse, Emmanuel et al

in Bulletin et Annales de la Société Royale Belge d’Entomologie = Bulletin en Annalen van de Koninklijke Belgische Vereniging voor Entomologie (1985), 121

Detailed reference viewed: 16 (0 ULg)