On the possibility of self-enrichement in globular clusters

in Noels-Grötsch, Arlette; Magain, Pierre; Caro, Denise (Eds.) et al Liege International Astrophysical Colloquia (2000)

Not Available

On the potential of extrasolar planet transit surveys

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 ▲]

On the Pragmatics of Subjectification: Emergence and Modalization of an Allative Future in Ancient Egyptian

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 ▲]

On the processing of red pigment by late mousterian Neanderthals in Ormesson, Seine-et-Marne, France, 47000 years ago

in en cours (n.d.)

On the properties of the hotelling’s T2 control chart with variable sampling intervals

in Quality & Quantity (2010)

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 ▲]

On the Provision of a Fast Connect Facility in a Connection-Mode Transport Service

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 ▲]

On the Quantum Potential and Pulsating Wave Packet in the Harmonic Oscillator

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 ▲]

On the real time reconstruction of the ionospheric electron density profile based on concurrent measurements from collocated digital ionosonde and GNSS receiver

(2011, May)

On the Recognizability of Self-Generating Sets

in Journal of Integer Sequences (2010), 13

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 ▲]

On the relation between bond quality and impact-echo frequency spectrum

in Proceedings of the 13th International Congress on Polymers in Concrete ICPIC 2010 (2010)

According to EN 1504-10 and ACI Concrete Repair Manual, bond strength and interface quality are the main features of repair system necessary to be assessed. Pull-off test is most commonly used for bond ... [more ▼]

According to EN 1504-10 and ACI Concrete Repair Manual, bond strength and interface quality are the main features of repair system necessary to be assessed. Pull-off test is most commonly used for bond strength evaluation but growing interest in nondestructive techniques (NDT) is recently noted. Impact-echo (IE) is treated as the most promising one for this purpose. The aim of this paper is to analyze an effect of bond quality on stress wave propagation in repair systems. A group of samples has been prepared in order to obtain repair systems of different bond quality. Prior to repair, quality of concrete substrates has been characterized according different techniques: compressive strength, superficial cohesion, surface roughness index and cracking quantification. Than a polymer-modified repair mortar has been applied. Af-ter hardening, IE signals have been recorded and pull-off bond strength determined. The rela-tionships between parameters characterizing surface quality, bond strength, IE frequency spec-trum and results of wavelet analysis of IE signal have been analyzed. [less ▲]