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See detailOn the potential increase of the oxidative stress status in patients with abdominal aortic aneurysm.
PINCEMAIL, Joël ULg; Defraigne, Jean-Olivier ULg; Cheramy-Bien, J. P. et al

in Redox Report : Communications in Free Radical Research (2012), 17(4), 139-44

BACKGROUND: Abdominal aortic aneurysm (AAA) is a major cause of preventable deaths in older patients. Oxidative stress has been suggested to play a key role in the pathogenesis of AAA. However, only few ... [more ▼]

BACKGROUND: Abdominal aortic aneurysm (AAA) is a major cause of preventable deaths in older patients. Oxidative stress has been suggested to play a key role in the pathogenesis of AAA. However, only few studies have been conducted to evaluate the blood oxidative stress status of AAA patients. METHODS AND RESULTS: Twenty seven AAA patients (mean age of 70 years) divided into two groups according to AAA size (</= 50 or > 50 mm) were compared with an age-matched group of 18 healthy subjects. Antioxidants (vitamins C and E, beta-carotene, glutathione, thiols, and ubiquinone), trace elements (selenium, copper, zinc, and copper/zinc ratio) and markers of oxidative damage to lipids (lipid peroxides, antibodies against oxidized patients, and isoprostanes) were measured in each subject. The comparison of the three groups by ordinal logistic regression showed a significant decrease of the plasma levels of vitamin C (P = 0.011), alpha-tocopherol (P = 0.016) but not when corrected for cholesterol values, beta-carotene (P = 0.0096), ubiquinone (P = 0.014), zinc (P = 0.0035), and of selenium (P = 0.0038), as AAA size increased. By contrast, specific markers of lipid peroxidation such as the Cu/Zn ratio (P = 0.046) and to a lesser extent isoprostanes (P = 0.052) increased. CONCLUSION: The present study emphasizes the potential role of the oxidative stress in AAA disease and suggests that an antioxidant therapy could be of interest to delay AAA progression. [less ▲]

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See detailOn the potential of extrasolar planet transit surveys
Gillon, Michaël ULg; Courbin, F.; Magain, Pierre ULg et al

in Astronomy and Astrophysics (2005), 442

We analyse the respective benefits and drawbacks of ground-based and space-based transit surveys for extrasolar planets. Based on simple but realistic assumptions about the fraction of lower main sequence ... [more ▼]

We analyse the respective benefits and drawbacks of ground-based and space-based transit surveys for extrasolar planets. Based on simple but realistic assumptions about the fraction of lower main sequence stars harboring telluric and giant planets within the outer limit of the habitable zone, we predict the harvests of fictitious surveys with three existing wide field optical and near-IR cameras: the CFHT-Megacam, SUBARU-Suprime and VISTA-IR. An additional promising instrument is considered, VISTA-Vis, currently under development. The results are compared with the harvests predicted under exactly the same assumptions, for the space missions COROT and KEPLER. We show that ground-based wide field surveys may discover more giant planets than space missions. However, space surveys seem to constitute the best strategy to search for telluric planets. In this respect, the KEPLER mission appears 50 times more efficient than any of the ground-based surveys considered here. KEPLER might even discover telluric planets in the habitable zone of their host star. [less ▲]

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See detailOn the Potential of Recommendation Technologies for Efficient Content Delivery Networks
Kaafar, Mohamed Ali; Berkovsky, Shlomo; Donnet, Benoît ULg

in Computer Communication Review (2013), 43(3), 74-77

During the last decade, we have witnessed a substantial change in content delivery networks (CDNs) and user access paradigms. If previously, users consumed content from a central server through their ... [more ▼]

During the last decade, we have witnessed a substantial change in content delivery networks (CDNs) and user access paradigms. If previously, users consumed content from a central server through their personal computers, nowadays they can reach a wide variety of repositories from virtually everywhere using mobile devices. This results in a considerable time-, location-, and event-based volatility of content popularity. In such a context, it is imperative for CDNs to put in place adaptive content management strategies, thus, improving the quality of services provided to users and decreasing the costs. In this paper, we introduce predictive content distribution strategies inspired by methods developed in the Recommender Systems area. Specifically, we outline different content placement strategies based on the observed user consumption patterns, and advocate their applicability in the state of the art CDNs. [less ▲]

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See detailOn the pragmatics of subjectification. The emergence and grammaticalization of a verb-less Allative Future in Ancient Egyptian
Grossman, Eitan; Polis, Stéphane ULg

in Acta Linguistica Hafniensia : International Journal of Linguistics (in press)

In this paper, we argue that an expanded conception of the distinction between speaker-oriented and subject-oriented inferences is crucial for understanding the motivations and mechanisms of semantic ... [more ▼]

In this paper, we argue that an expanded conception of the distinction between speaker-oriented and subject-oriented inferences is crucial for understanding the motivations and mechanisms of semantic change in grammaticalization and subjectivation, on the one hand, and for clarifying the links between semantic change and reductive formal changes. Speaker-oriented inferences have significant consequences, leading to the relaxation of selectional restrictions on a construction. In turn, the relaxation of selectional restrictions can create conditions in which the type- and token-frequency of a construction can rise considerably. Furthermore, changes in the selectional restrictions on a construction can themselves catalyze semantic change by coercing listeners into new form-function pairings. This framework is applied to the grammaticalization of allative futures, a typological comparative concept developed in order to compare structurally diverse future tenses. A small typological study allows us to reconsider some problematic pathways of grammaticalization and to suggest some alternative analyses. Following the typological discussion, a detailed diachronic case study of a verbless allative future in Ancient Egyptian is presented. [less ▲]

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See detailOn the Pragmatics of Subjectification: Emergence and Modalization of an Allative Future in Ancient Egyptian
Grossman, Eitan; Polis, Stéphane ULg

Conference (2010, November 11)

In this talk, we argue for a pragmatic basis for semantic change of the type observed in grammaticalization, viz., the conventionalization of conversational inferences (see, e.g., Bybee et al. 1994 ... [more ▼]

In this talk, we argue for a pragmatic basis for semantic change of the type observed in grammaticalization, viz., the conventionalization of conversational inferences (see, e.g., Bybee et al. 1994, Traugott & Dasher 2002, Ariel 2008) or more generally, the diachronic transfer of meaning from context to code (Givón 2005). Specifically, we claim that addressees (listeners/readers as active discourse participants) make inferences and in turn, as speakers/writers, propagate them, leading to their generalization. A crucial distinction must be made between SUBJECT-ORIENTED and SPEAKER-ORIENTED inferences, implicitly argued for in Bybee et al. (1994) and clearly downplayed in contemporary discussions such as Traugott & Dasher (2002). In SUBJECT-ORIENTED inferences, addressees interpret the utterance as a speaker’s report about the subject’s state of mind, while in the SPEAKER-ORIENTED ones, addressees interpret the utterance as reporting on the state of mind of the speaker. Speaker-oriented inferences are those that lead to the relaxing of selectional restrictions on subjects observed in a number of grammaticalization paths (illustration with allative future in the talk). Speaker-oriented inferences also lead to a rise in context-expansion and text frequency of constructions, which in turn catalyze many of the phenomena associated with grammaticalization. [less ▲]

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See detailOn the presence of a day-of-the-week effect in the foreign exchange market
Corhay, Albert ULg; Fatemi, Ali M; Tourani-Rad, Alireza

in Managerial Finance (1995), 21(8), 32-43

The purpose of this paper is to study the presence of the day-of-the-week effect in the foreign exchange market using an extensive data set of six exchange rates and employing two alternative types of ... [more ▼]

The purpose of this paper is to study the presence of the day-of-the-week effect in the foreign exchange market using an extensive data set of six exchange rates and employing two alternative types of distributional assumptions and also distribution-free tests. Our findings support the hypotheses of higher Wednesday returns prior to October 1, 1981, for the British pound, the Canadian dollar, the Deutsch mark, the French franc, the Swiss franc and the Japanese yen. Pursuant to the change in the settlement procedures which took effect October 1, 1981, the differential Wednesday returns disappear. [less ▲]

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See detailOn the privacy of file sharing services
Nikiforakis, Nick; Gadaleta, Francesco ULg; Younan, Yves et al

Report (2010)

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See detailOn the processing of red pigment by late mousterian Neanderthals in Ormesson, Seine-et-Marne, France, 47000 years ago
Salomon, Hélène ULg; Bodu, Pierre; Geurten, Stéphanie et al

in en cours (n.d.)

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See detailOn the Production and Kinematics of Sodium Atoms in the Head of Comet Hale-Bopp
Rauer, H.; Arpigny, Claude ULg; Hutsemekers, Damien ULg et al

in Bulletin of the American Astronomical Society (1997, July 01), 29

The interpretation of the presence and extent of the atomic sodium observed in comet Hale-Bopp raises a number of questions related to the production, motion, and lifetime of these Na atoms under the ... [more ▼]

The interpretation of the presence and extent of the atomic sodium observed in comet Hale-Bopp raises a number of questions related to the production, motion, and lifetime of these Na atoms under the action of the solar radiation near 1 AU. Here we report on data which pertain to the study of sodium in the head of the comet, yielding information on the Na emission in the coma out to ~ 0.15 x 10(6) km on the sunward side, to ~ 0.2 x 10(6) km tailwards. The observations were carried out at the Observatoire de Haute-Provence, with the 1.93 m telescope and the ELODIE spectrometer, which is fed by a pair of optical fibers with 2-arcsec apertures separated by 1.8 arcmin. In particular, spectra were obtained on 15-17 April, 1997, near the discovery date of the sodium tail at the La Palma Observatory. These spectra (resolution ~ 7 km/s) were used to determine Na D line profiles, as well as the relative intensities of the emissions corresponding to the two positions observed simultaneously. The main outcome of our first analysis concerns the profiles recorded some distance away from the optical centre, which all show velocity shifts and asymmetric line broadening in the direction of anti-sunward velocities. Some evidence is found to suggest the existence of an extended or multi-source production of sodium atoms, at least in the coma. Another series of spectra secured just before perihelion, 25-27 March, was analysed in the same way as the April spectra. Comparison between the two sets of data provides a nice illustration of the marked influence of the heliocentric radial velocity, not only upon the strength of the fluorescence ("Swings effect"), but also upon the motion of the emitting atoms, which are accelerated by the radiation pressure to widely different degrees as their excitation wavelengths fall at different places within the Fraunhofer Na D line profiles. [less ▲]

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See detailOn the projective geometry of the supercircle: a unified construction of the super cross-ratio and Schwarzian derivative
Michel, Jean-Philippe ULg; Duval, Christian

in International Mathematics Research Notices (2008), 2008

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See detailOn the properties of the hotelling’s T2 control chart with variable sampling intervals
Faraz, Alireza ULg; Chalaki, Kamyar; Moghadam, M. B.

in Quality & Quantity (2011), 45(3), 579-586

When T 2 control chart is used to monitor a process, it is usually assumed that the samples of size n0 is taken at constant intervals t0 . In this paper, we investigate the T 2 control chart for ... [more ▼]

When T 2 control chart is used to monitor a process, it is usually assumed that the samples of size n0 is taken at constant intervals t0 . In this paper, we investigate the T 2 control chart for monitoring the process mean vector when the sampling intervals are variable. Recent studies have shown that the variable sampling interval (VSI) scheme helps practitioners detect process shifts more quickly than the classical scheme Fixed Ratio Sampling (FRS). In this paper, it is assumed that the length of time the process remains in control is exponentially distributed. [less ▲]

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See detailOn the Protoporphyrin Monolayers Conformation
Humbert, Christophe; Dreesen, Laurent ULg; Sartenaer, Yannick et al

in Chemphyschem : A European Journal of Chemical Physics and Physical Chemistry (2006), 7

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See detailOn the Provision of a Fast Connect Facility in a Connection-Mode Transport Service
Leduc, Guy ULg; Danthine, André ULg

in The OSI95 Transport Service with Multimedia Support (1994)

A "fast connect" facility in a connection-mode service allows the calling service user to send service data units without waiting for the rount trip delay associated with the successful establishment of ... [more ▼]

A "fast connect" facility in a connection-mode service allows the calling service user to send service data units without waiting for the rount trip delay associated with the successful establishment of the connection. In this paper we investigate how such a fast connect facility can be added to a connection-mode transport service. Starting from the eXpress Transfer Protocol (XTP) which is at the origin of the concepr, we analyse the High Speed Transport Service (HSTS) and study how it can be improved by the introduction of a listening interaction at the called side. After having criticized these two transport facilities, we finally propose three possible models of the fast connect facility. The first one is the 4-primitive connection establishment from the Broadbant Transport Service (BTS) and the last ones are two 3-primitive connection establishment. [less ▲]

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See detailOn the Purification of Women: Churching in Northern France, 1100-1500, by Paula M. Rieder
L'Estrange, Elizabeth ULg

in Medieval Feminist Forum [= MFF] (2007), 43(2), 73-76

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See detailOn the Quality of BGP Route Collectors for iBGP Policy Inference
Cittadini, Luca; Vissicchio, Stefano; Donnet, Benoît ULg

in IFIP Networking (2014, June)

A significant portion of what is known about Internet routing stems out from public BGP datasets. For this reason, numerous research efforts were devoted to (i) assessing the (in)completeness of the ... [more ▼]

A significant portion of what is known about Internet routing stems out from public BGP datasets. For this reason, numerous research efforts were devoted to (i) assessing the (in)completeness of the datasets, (ii) identifying biases in the dataset, and (iii) augmenting data quality by optimally placing new collectors. However, those studies focused on techniques to extract information about the AS-level Internet topology. In this paper, we show that considering different metrics influences the conclusions about biases and collector placement. Namely, we compare AS-level topology discovery with \iac inference. We find that the same datasets exhibit significantly diverse biases for these two metrics. For example, the sensitivity to the number and position of collectors is noticeably different. Moreover, for both metrics, the marginal utility of adding a new collector is strongly localized with respect to the proximity of the collector. Our results suggest that the ``optimal'' position for new collectors can only be defined with respect to a specific metric, hence posing a fundamental trade-off for maximizing the utility of extensions to the BGP data collection infrastructure. [less ▲]

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See detailOn the Quantum Potential and Pulsating Wave Packet in the Harmonic Oscillator
Dubois, Daniel ULg

in Dubois, Daniel (Ed.) COMPUTING ANTICIPATORY SYSTEMS (2008)

A fundamental mathematical formalism related to the Quantum Potential factor, Q, is presented in this paper. The Schrödinger equation can be transformed to two equations depending on a group velocity and ... [more ▼]

A fundamental mathematical formalism related to the Quantum Potential factor, Q, is presented in this paper. The Schrödinger equation can be transformed to two equations depending on a group velocity and a density of presence of the particle. A factor, in these equations, was called “Quantum Potential” by D. Bohm and B. Hiley. In 1999, I demonstrated that this Quantum Potential, Q, can be split in two Quantum Potentials, Q1, and Q2, for which the relation, Q=Q1+Q2, holds. These two Quantum Potentials depend on a fundamental new variable, what I called a phase velocity, u, directly related to the probability density of presence of the wave-particle, given by the modulus of the wave function. This paper gives some further developments for explaining the Quantum Potential for oscillating and pulsating Gaussian wave packets in the Harmonic Oscillator. It is shown that the two Quantum Potentials play a central role in the interpretation of quantum mechanics. A breakthrough in the formalism of the Quantum Mechanics could be provoked by the physical properties of these Quantum Potentials. The probability density of presence of the oscillating and pulsating Gaussian wave packets in the Harmonic Oscillator is directly depending on the ratio Q2/Q1 of the two Quantum Potentials. In the general case, the energy of these Gaussian wave packets is not constant, but is oscillating. The energy is given by the sum of the kinetic energy, T, the potential energy, V, and the two Quantum Potentials: E=T+V+Q1+Q2. For some conditions, given in the paper, the energy can be a constant. The first remarkable result is the fact that the first Quantum Potential, Q1, is related to the ground state energy, E0, of the Quantum Harmonic Oscillator: Q1=[barred aitch]omega/2=E0. The second result is related to the property of the second Quantum Potential, Q2, which plays the role of an anti-potential, Q2=-V(x), where V is the harmonic oscillator potential. This Quantum Potential counter-balances the harmonic oscillator potential, so there is no more harmonic potential in the quantum harmonic oscillator. It remains just a constant potential given by the first Quantum Potential, Q1. The interpretation is as follows: a quantum system can annihilate a classical potential, and so gives rise to a quantum tunnelling, which violates the principles of Classical Mechanics. [less ▲]

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See detailOn the Rayleigh-Marangoni-Benard instability of a Ferrofluid Layer, submitted to a Vertical Magnetic Field
Hennenberg, M.; Weyssow, B.; Slavtchev, S. et al

in 2nd International Marangoni Association Congress (2004)

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See detailOn the real and apparent variations of the latitude of Greenwich
Folie, François ULg

in Monthly Notices of the Royal Astronomical Society (1890), 51

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See detailOn the Recognizability of Self-Generating Sets
Kärki, Tomi ULg; Lacroix, Anne ULg; Rigo, Michel ULg

in Lecture Notes in Computer Science (2009), 5734

Let I be a finite set of integers and F be a finite set of maps of the form n->k_i n + l_i with integer coefficients. For an integer base k>=2, we study the k-recognizability of the minimal set X of ... [more ▼]

Let I be a finite set of integers and F be a finite set of maps of the form n->k_i n + l_i with integer coefficients. For an integer base k>=2, we study the k-recognizability of the minimal set X of integers containing I and satisfying f(X)\subseteq X for all f in F. In particular, solving a conjecture of Allouche, Shallit and Skordev, we show under some technical conditions that if two of the constants k_i are multiplicatively independent, then X is not k-recognizable for any k>=2. [less ▲]

Detailed reference viewed: 52 (16 ULg)