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See detailControl of the porosity of anatase thin films prepared by EISA: Influence of thickness and heat treatment
Henrist, Catherine ULg; Dewalque, Jennifer ULg; Mathis, François ULg et al

in Microporous and Mesoporous Materials (2009), 117

Mesoporous anatase thin films were prepared by the evaporation-induced self-assembly process. This paper reports a study of the influence of several physical parameters on the long-range ordering of the ... [more ▼]

Mesoporous anatase thin films were prepared by the evaporation-induced self-assembly process. This paper reports a study of the influence of several physical parameters on the long-range ordering of the mesopores. A preliminary study was done to set the best humidity conditions during dip-coating and ageing of the films. The withdrawal speed, already known to modify the thickness of the deposited film, was shown to exert a strong influence on the percentage of porosity. This was studied by step profilometry combined with Rutherford backscattered spectrometry (RBS). In parallel, small angle X-ray scattering (SAXS), X-ray diffraction (XRD), transmission electron microscopy (TEM) and RBS were used to tune the precise thermal treatment applied to the so-obtained films, in order to preserve the porous mesostructure and promote the nanocrystallization of anatase TiO2. [less ▲]

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See detailControl of the Radical Polymerization by 2,2,15,15-tetramethyl-1-aza-4,7,10,13-tetraoxacyclopentadecan-1-oxyl and its Sodium Salt
Olive, Gilles ULg; Rozanska, Xavier; Smulders, Wilfred et al

in Macromolecular Chemistry and Physics (2002), 203(12), 1790-1796

The control of the radical polymerization of styrene by 2,2,15,15-tetramethyl-1-aza-4,7,10,13-tetraoxacyclopentadecan-1-oxyl is reported here in bulk at 90 °C, 120 °C and in miniemulsion. Similarly, the ... [more ▼]

The control of the radical polymerization of styrene by 2,2,15,15-tetramethyl-1-aza-4,7,10,13-tetraoxacyclopentadecan-1-oxyl is reported here in bulk at 90 °C, 120 °C and in miniemulsion. Similarly, the control by its sodium complex is reported in bulk at 90 °C. [less ▲]

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See detailControl of the radical polymerization of tert-butyl methacrylate in water by a novel combination of sodium nitrite and iron(II) sulfate
Detrembleur, Christophe ULg; Teyssié, Philippe; Jérôme, Robert ULg

in Macromolecules (2002), 35(5), 1611-1621

Addition of iron(II) sulfate to sodium nitrite is a new way to control the radical polymerization of tert-butyl methacrylate (tBMA) in water at 80 degreesC. Nitric oxide is released in the reaction medium ... [more ▼]

Addition of iron(II) sulfate to sodium nitrite is a new way to control the radical polymerization of tert-butyl methacrylate (tBMA) in water at 80 degreesC. Nitric oxide is released in the reaction medium as result of the reduction of sodium nitrite by FeSO4. This reaction is of utmost importance because three repeated additions of an alkyl radical to nitric oxide leads to the formation of nitroxide radicals. The basic mechanism for the control of the radical polymerization is thus a nitroxide-mediated process. [less ▲]

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See detailControl of the semi-rigid behaviour of civil engineering structural connections
Jaspart, Jean-Pierre ULg

in Control of the semi-rigid behaviour of civil engineering structural connections (1999)

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See detailControl of tumor size and hormonal hypersecretion in acromegaly : a large single-center experience
Daly, Adrian ULg; Tikhomirova, M.; Petrossians, Patrick ULg et al

in European Congress of Endocrinology - Abstract book (2005)

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See detailControl of vesicle fusion by a tyrosine phosphatase.
Huynh, Huong; Bottini, Nunzio; Williams, Scott et al

in Nature cell biology (2004), 6(9), 831-9

The tyrosine phosphatase PTP-MEG2 is targeted by its amino-terminal Sec14p homology domain to the membrane of secretory vesicles. There it regulates vesicle size by promoting homotypic vesicle fusion by a ... [more ▼]

The tyrosine phosphatase PTP-MEG2 is targeted by its amino-terminal Sec14p homology domain to the membrane of secretory vesicles. There it regulates vesicle size by promoting homotypic vesicle fusion by a mechanism that requires its catalytic activity. Here, we identify N-ethylmaleimide-sensitive factor (NSF), a key regulator of vesicle fusion, as a substrate for PTP-MEG2. PTP-MEG2 reduced the phosphotyrosine content of NSF and co-localized with NSF and syntaxin 6 in intact cells. Furthermore, endogenous PTP-MEG2 co-immunoprecipitated with endogenous NSF. Phosphorylation of NSF at Tyr 83, as well as an acidic substitution at the same site, increased its ATPase activity and prevented alphaSNAP binding. Conversely, expression of a Y83F mutant of NSF caused spontaneous fusion events. Our results suggest that the molecular mechanism by which PTP-MEG2 promotes secretory vesicle fusion involves the local release of NSF from a tyrosine-phosphorylated, inactive state. This represents a novel mechanism for localized regulation of NSF and the first demonstrated role for a protein tyrosine phosphatase in the regulated secretory pathway. [less ▲]

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See detailControl strategies study of a complete solar assisted air conditioning system in an office building using TRNSYS
Thomas, Sébastien ULg; Andre, Philippe ULg

(2009, September)

It is now clearly assumed that solar assisted air conditioning is able to minimize environmental impact and CO2 production of buildings operation. How to reach highest energy savings is still a work in ... [more ▼]

It is now clearly assumed that solar assisted air conditioning is able to minimize environmental impact and CO2 production of buildings operation. How to reach highest energy savings is still a work in progress. In former literature, equipment control has been point out as a critical feature of energy consumption. Control becomes more and more important as system is complex. The complete simulation environment was developed in previous work, it includes the absorption chiller itself, the rejection circuit (cooling tower), solar panels field, heater, storage device, pumps, heating-cooling networks, emission system and building. TRNSYS software modular approach provides the possibility to model and simulate this complete system. In this article, different strategies are proposed to minimize consumption for air-conditioning. [less ▲]

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See detailA control strategy for controllable series capacitor in electric power systems
Ghandhari, Mehrdad; Andersson, Goran; Pavella, Mania ULg et al

in Automatica (2001), 37

It has been veri"ed that a controllable series capacitor with a suitable control scheme can improve transient stability and help to damp electromechanical oscillations. A question of great importance is ... [more ▼]

It has been veri"ed that a controllable series capacitor with a suitable control scheme can improve transient stability and help to damp electromechanical oscillations. A question of great importance is the selection of the input signals and a control strategy for this device in order to damp power oscillations in an e!ective and robust manner. Based on Lyapunov theory a control strategy for damping of electromechanical power oscillations in a multi-machine power system is derived. Lyapunov theory deals with dynamical systems without inputs. For this reason, it has traditionally been applied only to closed-loop control systems, that is, systems for which the input has been eliminated through the substitution of a predetermined feedback control. However, in this paper, we use Lyapunov function candidates in feedback design itself by making the Lyapunov derivative negative when choosing the control. This control strategy is called control Lyapunov function for systems with control inputs. Also, two input signals for this control strategy are used. The "rst one is based on local information and the second one on remote information derived by the single machine equivalent method. [less ▲]

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See detailControl Systems and Automation in Steel Thixoforming Production
Rassili, Ahmed ULg; Fischer, Dirk

Book published by CRC Press (2011)

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See detailControl technology and LOGO : a belgian experience
Denis, Brigitte ULg

Conference (1990)

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See detailControl technology in elementary education
Denis, Brigitte ULg

Book published by Springer Verlag (1993)

Detailed reference viewed: 133 (1 ULg)
See detailControl Theoretical Challenges in Systems Biology
Bullinger, Eric ULg

Scientific conference (2006, May 26)

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See detailControl Theoretical Challenges in Systems Biology
Bullinger, Eric ULg

Conference (2006, August 29)

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See detailControl Theoretical Challenges in Systems Biology
Bullinger, Eric ULg

Scientific conference (2006, June 15)

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See detailControl Theoretical Challenges in Systems Biology
Bullinger, Eric ULg

Scientific conference (2006, May 24)

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See detailControl Theory Challenges in Biology Medicine
Bullinger, Eric ULg

Scientific conference (2007, May 24)

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See detailControl Theory Challenges in Biology & Medicine
Bullinger, Eric ULg

Scientific conference (2007, March 15)

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See detailContrôle d'un turboréacteur au banc d'essai sur base d'une modélisation en régime transitoire
Thomas, Jean-Philippe ULg

Master's dissertation (2005)

Le service de Turbomachines et Propulsion de l'Université de Liège dispose depuis plusieurs années d'un turboréacteur de laboratoire. Celui-ci consiste en un outil à vocation pédagogique très précieux, et ... [more ▼]

Le service de Turbomachines et Propulsion de l'Université de Liège dispose depuis plusieurs années d'un turboréacteur de laboratoire. Celui-ci consiste en un outil à vocation pédagogique très précieux, et c'est dans ce cadre que ce travail fut réalisé. L'objectif majeur de cette étude était la synthèse et l'application d'un contrôleur digital analogue aux systèmes en usage dans l'aviation civile et militaire. Pour atteindre ce but, plusieurs étapes furent nécessaires. Avant cette entreprise, le banc d'essai disposait d'une mesure de la poussée, effet utile du moteur, fortement parasitée par l'ajout de divers dispositifs au cours des années. Cette mesure étant une information importante, notamment en vue d'une modélisation, et l'effet régulé, il fut nécessaire d'améliorer le système existant. Ceci fut réalisé par une démarche technique complète. Un étalonnage du dispositif fut effectué et montra une pleine satisfaction de l'objectif. L'étape suivante fut la modélisation du moteur, pré-requis à toute étude ultérieure. Par une prise en compte des particularités de celui-ci, cette modélisation montra, après un recalage sur base de mesures prises au banc d'essai, une très bonne qualité de prédiction en régime stationnaire. Son extension au régime transitoire permit de modéliser précisément la dynamique liée à la vitesse de rotation. Celle des autres grandeurs fut par contre quantitativement déficiente mais qualitativement cohérente, en traduisant correctement le comportement physique de chacune. Il fut dès lors possible d'exploiter ce modèle pour la synthèse d'un régulateur. Le contrôleur devait répondre à deux objectifs: la diminution du temps de réponse et le respect des limites physiques du moteur. Ceci fut réalisé par la synthèse d'un régulateur comprenant une série de boucles SISO (Single Input Single Output): l'une gérant le contrôle sur la poussée et les autres garantissant chacune le respect d'une limite. L'utilisation de ce dispositif sur le modèle permit la satisfaction des objectifs, y compris en présence de bruit de mesure. La dernière étape du travail devait être l'application de ce contrôleur au banc d'essai. Celui-ci révéla cependant une telle inadaptation à un contrôle précis et rapide que l'objectif dû être orienté vers un contrôle plus simple, éloigné de la théorie précédente, qui autorisa néanmoins un suivi de consigne satisfaisant. Cette démarche permit malgré tout de mettre en exergue les déficiences du banc d'essai en vue d'une amélioration future conséquente, afin de permettre l'application de la théorie développée et d'ouvrir une porte vers un approfondissement du contrôle. [less ▲]

Detailed reference viewed: 252 (11 ULg)