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See detailCycle-based TCP-Friendly Algorithm
Ait-Hellal, Omar; Yamamoto, Lidia; Leduc, Guy ULiege

in Proceedings of IEEE Globecom'99 (1999, December)

Several TCP-Friendly algorithms have been recently proposed to support multimedia applications. These algorithms try to mimic the congestion control behavior of TCP. However, the oscillatory (bursty ... [more ▼]

Several TCP-Friendly algorithms have been recently proposed to support multimedia applications. These algorithms try to mimic the congestion control behavior of TCP. However, the oscillatory (bursty) nature of TCP traffic is widely known to be unsuitable for most typical real-time applications. Adopting such behavior would result in annoying QoS oscillations for the users of such real-time applications. In the present paper we describe a new TCP-Friendly algorithm based on the TCP cycle estimation. We show through simulations that the proposed algorithm is able to smooth the oscillations while keeping fairness towards TCP. [less ▲]

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See detailLes cycles du désir sexuel (saison 2)
Kempeneers, Philippe ULiege

in Sexualités humaines (2010), 6

Cette deuxième saison au pays du désir nous conduit aux confins de la passion amoureuse, entre animalité et profonde humanité

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See detailLes cycles du désir sexuel (saison 3)
Kempeneers, Philippe ULiege

in Sexualités humaines (2010), 7

Au terme de ce triptyque sur le désir et ses différentes figures, un cas clinique très éclairant

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See detailCycles found in air temperature data and proxy series using the Morlet wavelet method
Nicolay, Samuel ULiege; Mabille, Georges ULiege; Fettweis, Xavier ULiege et al

Scientific conference (2009, February 25)

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See detailCycles in the Temperature Data Are Induced by the Sun
Nicolay, Samuel ULiege; Mabille, Georges ULiege; Fettweis, Xavier ULiege et al

Poster (2009, April)

The presence of two cycles of period of 30 and 42 months approximatively has been observed in temperature records and climatic indices. Moreover, it has been shown that these cycles are statistically ... [more ▼]

The presence of two cycles of period of 30 and 42 months approximatively has been observed in temperature records and climatic indices. Moreover, it has been shown that these cycles are statistically significant. Here we outline the role played by the Sun in the presence of these cycles, observed in time series. To do so, we use IPCC AR4 climatic models, sunspot number data and the Morlet wavelet method. [less ▲]

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See detailCycles of humid-dry climate conditions around the P/E boundary: New stable isotope data from terrestrial organic matter in Vasterival section (NW France)
Storme, Jean-Yves ULiege; Dupuis, C.; Schnyder, J. et al

in Terra Nova (2012), 24(2), 114-122

The Palaeocene/Eocene boundary (P/EB) and the Palaeocene-Eocene Thermal Maximum (55.8Ma) are defined stratigraphically based on carbon isotope ratios of various materials. Here, the position of the P/EB ... [more ▼]

The Palaeocene/Eocene boundary (P/EB) and the Palaeocene-Eocene Thermal Maximum (55.8Ma) are defined stratigraphically based on carbon isotope ratios of various materials. Here, the position of the P/EB is refined in the terrestrial-lacustrine and swampy Vasterival section (Upper Normandy coast, France) by using carbon isotopes measured on dispersed organic matter (δ 13C org). Moreover, nitrogen isotopes on dispersed organic matter (δ 15N org) are, for the first time in the Palaeogene record, associated with carbon isotope and lithological data to constrain palaeoclimatic and environmental changes around the P/EB in a terrestrial environment. Humid-dry fluctuations before and during this key interval in Earth history are suggested. © 2012 Blackwell Publishing Ltd. [less ▲]

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See detailCyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives
Cerfontaine, Benjamin ULiege; Collin, Frédéric ULiege

in Rock Mechanics & Rock Engineering (in press)

The purpose of this paper is to provide a comprehensive state of the art of fatigue and cyclic loading of natural rock materials. Papers published in the literature are classified and listed in order to ... [more ▼]

The purpose of this paper is to provide a comprehensive state of the art of fatigue and cyclic loading of natural rock materials. Papers published in the literature are classified and listed in order to ease bibliographical review, to gather data (sometimes contradictory) on classical experimental results and to analyse the main interpretation concepts. Their advantages and limitations are discussed, and perspectives for further work are highlighted. The first section summarises and defines the different experimental set-ups (type of loading, type of experiment) already applied to cyclic/fatigue investigation of rock materials. The papers are then listed based on these different definitions. Typical results are highlighted in next section. Fatigue/cyclic loading mainly results in accumulation of plastic deformation and/or damage cycle after cycle. A sample cyclically loaded at constant amplitude finally leads to failure even if the peak load is lower than its monotonic strength. This subcritical crack is due to a diffuse microfracturing and decohesion of the rock structure. The third section reviews and comments the concepts used to interpret the results. The fatigue limit and S–N curves are the most common concepts used to describe fatigue experiments. Results published from all papers are gathered into a single figure to highlight the tendency. Predicting the monotonic peak strength of a sample is found to be critical in order to compute accurate S–N curves. Finally, open questions are listed to provide a state of the art of grey areas in the understanding of fatigue mechanisms and challenges for the future. [less ▲]

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See detailCyclic and oligo-carbonates by organocatalytic coupling of CO2 with epoxides or oxetanes
Alves, Margot ULiege; Grignard, Bruno ULiege; Boyaval, Amélie ULiege et al

Conference (2016, April 20)

Valorising CO2 as a renewable C1 feedstock for producing added value building blocks is the scope of many academic and industrial researches. Carbon dioxide is a thermodynamically and kinetically stable ... [more ▼]

Valorising CO2 as a renewable C1 feedstock for producing added value building blocks is the scope of many academic and industrial researches. Carbon dioxide is a thermodynamically and kinetically stable molecule that can be converted into five and six membered cyclic carbonates by coupling with epoxides or oxetanes, respectively, using appropriate catalysts. Although transition metal catalysts are efficient under atmospheric pressure and ambient temperature, most of them are poorly selective, sensitive to hydrolysis and/or oxidation and/or toxic whereas less/non-toxic and eco-friendly organocatalysts such as ionic liquids and halide salts are generally only efficient at very high temperature and pressure favouring their thermal degradation. To overcome these limitations, we developed a new highly efficient bicomponent homogeneous organocatalyst composed of an ammonium salt as the catalyst and fluorinated single or double hydrogen bond donor activators. Through online FTIR kinetic studies, we demonstrated that this new organocatalyst showed unexpected catalytic activity for the fast and selective addition of CO2 onto epoxides under solvent-free and mild experimental conditions. The use of this dual catalyst was then extended to the coupling of CO2 with less reactive oxetanes to produce hydroxyl telechelic oligocarbonates. In the first part of this talk, based on kinetics of reactions followed by online FTIR under pressure, we will describe the reaction conditions required for the organocatalytic coupling of CO2 with epoxides and oxetanes. In the second part, the mechanism of the reaction will be approached and discussed based on DFT calculations. Finally, we will compare and discuss the efficiency of various organocatalytic systems for this type of reaction. [less ▲]

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See detailCyclic appearance of left ventricular outflow tract dynamic obstruction during mechanical ventilation: evidence for a preload dependent phenomenon.
Canivet, Jean-Luc ULiege; Lancellotti, Patrizio ULiege; Radermecker, Marc ULiege et al

in Journal of Intensive Care Medicine (2008), 23(4), 281-4

The cyclic appearance of dynamic left ventricular outflow tract obstruction during mechanical ventilation, according to the phasic changes in preload, is described in this article. Hemodialysis-induced ... [more ▼]

The cyclic appearance of dynamic left ventricular outflow tract obstruction during mechanical ventilation, according to the phasic changes in preload, is described in this article. Hemodialysis-induced fluid removal resulted in preload dependence as evidenced by the pulse pressure variation in a 56-year-old critically ill patient. The clinical picture was suggestive of myocardial failure. Transthoracic echocardiography disclosed dynamic left ventricular outflow tract obstruction associated with systolic anterior motion of the mitral valve. Progressive fluid restitution resulted in a parallel decrease in both the degree of dynamic obstruction and pulse pressure variation. During fluid loading, dynamic obstruction disappeared at first during the inspiratory phase of intermittent positive pressure ventilation corresponding to the phasic increase in left ventricular preload. Further fluid loading resulted in the disappearance of dynamic obstruction during both inspiratory and expiratory phase of intermittent positive pressure ventilation. This is the first reported case clearly relating left ventricular outflow tract dynamic obstruction to preload dependence during mechanical ventilation in a critically ill patient without predisposing anatomical factor. [less ▲]

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See detailCyclic behaviour of cohesionless soils under seismic loading
Cerfontaine, Benjamin ULiege

Diverse speeche and writing (2012)

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See detailThe cyclic behaviour of sand, from the Prevost model to offshore geotechnics
Cerfontaine, Benjamin ULiege

Doctoral thesis (2014)

The main objective of this thesis is the studying of the cyclic behaviour of dense sand. Its centre of gravity is the implementation of a convenient constitutive law in the finite element code LAGAMINE ... [more ▼]

The main objective of this thesis is the studying of the cyclic behaviour of dense sand. Its centre of gravity is the implementation of a convenient constitutive law in the finite element code LAGAMINE. The first step consists in summarising the salient features of the cyclic behaviour of sand observed in laboratory tests. Undrained monotonic and cyclic experiments are addressed. The phase transformation line is a key parameter in the description of its behaviour. The plasticity effects in both loading and unloading, the progressive pore pressure accumulation coupled with the degradation of the stiffness of the soil are of uttermost importance in the cyclic behaviour. The Prevost model is adopted for its conceptual simplicity and its physically related parameters. The basic equations of the model are described and its variants are illustrated. Calibration of the required parameters is carried out by means of simplified routines implemented in Matlab. A unique set of parameters is determined for each soil at a given relative density. Monotonic experiments are well reproduced. The model also replicates satisfactorily the trend of cyclic experiments. An implicit scheme is embraced in order to implement the model in the finite element code LAGAMINE. The implicit Prager translation rule is adopted for that purpose. It is ensured the discrete formulation reproduces exactly the analytical model. Accuracy, efficiency and robustness of the model are addressed throughout triaxial and multi-axial numerical examples. A hydro-mechanical interface finite element is developed. It consists in a three-node 1D isoparametric element. It is able to reproduce fluid flows across and along the interface. The unsticking of both walls of the interface is coupled with a suction effect due to the filling of the vacuum created. The behaviour of the element is illustrated by simple 1D examples of transient consolidation of a soil column. A final application consists in the modelling of a suction caisson, part of a tripod structure for wind turbines. An axisymmetric representation of this foundation is carried out. It is assumed embedded into dense Lund sand described by the Prevost model. Monotonic and cyclic simulations are performed in both drained and partially drained conditions. The salient features of the resistance of such foundations are highlighted. Their partially drained behaviour strongly increases their transient resistance. A storm including an extreme event is employed to simulate a cyclic loading. A pseudo-random short signal and its sinusoidal equivalent representation finally lead to an identical vertical settlement. This is confirmed by a long duration storm. Finally, a cyclic diagram summarising the final settlement attained for combinations of average and cyclic vertical loads is elaborated. Keywords [less ▲]

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See detailCyclic catamenial dermatoses.
Hermanns-Lê, Trinh ULiege; Hermanns, Jean François; Lesuisse, Marianne et al

in BioMed Research International (2013), 2013

Detailed reference viewed: 33 (4 ULiège)
See detailCyclic esterketone compounds and processes for the synthesis and use thereof
Wautier, Henri; Laterre, Jean-Pierre; Lecomte, Philippe ULiege et al

Patent (2001)

Cyclic esterketone compounds, and in particular, 2-oxepane-1,5-dione, which are useful as a monomer for the production of polymers, and in particular for the production of poly(2-oxepane-1,5-dione ... [more ▼]

Cyclic esterketone compounds, and in particular, 2-oxepane-1,5-dione, which are useful as a monomer for the production of polymers, and in particular for the production of poly(2-oxepane-1,5-dione). Processes are also disclosed for both the synthesis of this new compound and for the use (polymerization) thereof for the preparation of poly(2-oxepane-1,5-dione). The poly(2-oxepane-1,5-dione) polymers and copolymers which are obtained by use of the polymerization processes with the monomer compounds are also disclosed. [less ▲]

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See detailCyclic esterketone compounds, processes for the synthesis thereof
Wautier, Henri; Latere, Jean-Pierre; Lecomte, Philippe ULiege et al

Patent (2000)

Cyclic esterketone compounds, and in particular, 2-oxepane-1,5-dione, which are useful as a monomer for the production of polymers, and in particular for the production of poly(2-oxepane-1,5-dione ... [more ▼]

Cyclic esterketone compounds, and in particular, 2-oxepane-1,5-dione, which are useful as a monomer for the production of polymers, and in particular for the production of poly(2-oxepane-1,5-dione). Processes are also disclosed for both the synthesis of this new compound and for the use (polymerization) thereof for the preparation of poly(2-oxepane-1,5-dione). The poly(2-oxepane-1,5-dione) polymers and copolymers which are obtained by use of the polymerization processes with the monomer compounds are also disclosed. [less ▲]

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See detailCyclic esterketone compounds, processes for the synthesis thereof and process for the preparation of poly (esterketone) polymers
Wautier, Henri; Latere, Jean-Pierre; Lecomte, Philippe ULiege et al

Patent (2002)

Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of ... [more ▼]

Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of polyesterketone polymers by polymerization of cyclic esterketones and polyesterketone polymers so obtained. [less ▲]

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See detailCyclic esterketone compounds, processes for the synthesis thereof and process for the preparation of poly (esterketone) polymers
Wautier, Henri; Latere, Jean-Pierre; Lecomte, Philippe ULiege et al

Patent (2001)

PROBLEM TO BE SOLVED: To provide a monomer compound, which is improved to be useful as the novel monomer for forming a poly(ester ketone)polymer by polymerization, and can be directly synthesized in high ... [more ▼]

PROBLEM TO BE SOLVED: To provide a monomer compound, which is improved to be useful as the novel monomer for forming a poly(ester ketone)polymer by polymerization, and can be directly synthesized in high yield in a one-stage process from the stock material. SOLUTION: This compound is a novel cyclic ester compound, in particular 2-oxepane-1,5-dione (KCL), synthesized in one-stage process involving oxidation of the stock material (cyclic diketone, e.g. 1,4-cyclohexane-dione) and useful for simply and easily producing a poly(ester ketone)polymer, in particular poly(2- oxepane-1,5-dione) (PKCL) in high yield. [less ▲]

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See detailCyclic esterketone compounds, processes for the synthesis thereof and process for the preparation of poly(esterketone)polymers
Wautier, Henri; Latere, Jean-Pierre; Lecomte, Philippe ULiege et al

Patent (2000)

Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of ... [more ▼]

Unsubstituted oxepane-diones useful as monomers for the production of polymers, process for the synthesis thereof by oxidation of unsubstituted cyclohexanediones, process for the preparation of polyesterketone polymers by polymerisation of cyclic esterketones and polyesterketone polymers so obtained. [less ▲]

Detailed reference viewed: 19 (1 ULiège)
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See detailCyclic lipopeptide profile of the plant-beneficial endophytic bacterium Bacillus subtilis HC8
Malfanova, N.; Franzil, Laurent ULiege; Lugtenberg, B. et al

in Archives of Microbiology (2012)

In a previous study (Malfanova et al. in Microbial Biotech 4:523-532, 2011), we described the isolation and partial characterization of the biocontrol endophytic bacterium B. subtilis HC8. Using thin ... [more ▼]

In a previous study (Malfanova et al. in Microbial Biotech 4:523-532, 2011), we described the isolation and partial characterization of the biocontrol endophytic bacterium B. subtilis HC8. Using thin-layer chromatography, we have detected several bioactive antifungal compounds in the methanolic extract from the acid-precipitated supernatant of HC8. In the present study, we have further analyzed this methanolic extract using liquid chromatography-mass spectrometry. Based on the comparison of retention times and molecular masses with those of known antifungal compounds, we identified three families of lipopeptide antibiotics. These include four iturins A having fatty acyl chain lengths of C14 to C17, eight fengycins A (from C14 to C18 and from C15 to C17 containing a double bond in the acyl chain), four fengycins B (C15 to C18), and five surfactins (C12 to C16). Evaluation of the antifungal activity of the isolated lipopeptides showed that fengycins are the most active ones. To our knowledge, this is the first report of an endophytic Bacillus subtilis producing all three major families of lipopeptide antibiotics containing a very heterogeneous mixture of homologues. The questions remain open which of these lipopeptides (1) are being produced during interaction with the plant and (2) are contributing to the biocontrol activity of HC8. © 2012 The Author(s). [less ▲]

Detailed reference viewed: 50 (6 ULiège)