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Search Results: 1 - 10 of 28829 matches for " Jean-Marc Derrien "
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A local limit theorem in stationary random environment of conductances on Z
Jean-Marc Derrien
Mathematics , 2013,
Abstract: We prove a local limit theorem for nearest neighbours random walks in stationary random environment of conductances on Z without using any of both classic assumptions of uniform ellipticity and independence on the conductances. Besides the central limit theorem, we use discrete differential "Nash-type inequalities" associated with the Hausdorff's representation of the completely decreasing sequences.
A simple proof of a recurrence theorem for random walks in $\Z^{2}$
Jean-Marc Derrien
Mathematics , 2006,
Abstract: In this note, we prove without using Fourier analysis that the symmetric square integrable random walks in $\Z^{2}$ are recurrent.
Variance limite d'une marche aléatoire réversible en milieu aléatoire sur Z (Limit of the Variance of a Reversible Random Walk in Random Medium on Z)
Jér?me Depauw,Jean-Marc Derrien
Mathematics , 2009,
Abstract: The Central Limit Theorem for the random walk on a stationary random network of conductances has been studied by several authors. In one dimension, when conductances and resistances are integrable, and following a method of martingale introduced by S. Kozlov (1985), we can prove the Quenched Central Limit Theorem. In that case the variance of the limit law is not null. When resistances are not integrable, the Annealed Central Limit Theorem with null variance was established by Y. Derriennic and M. Lin (personal communication). The quenched version of this last theorem is proved here, by using a very simple method. The similar problem for the continuous diffusion is then considered. Finally our method allows us to prove an inequality for the quadratic mean of a diffusion (X_t)_t at all time t.
On the Role of Chloroplasts in the Polymerization of Tannins in Tracheophyta: A Monograph  [PDF]
Jean-Marc Brillouet
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.69140
Abstract: Proanthocyanidins are formed in the chlorophyllous organs of Tracheophyta from a redifferentiation of chloroplasts involving the thylakoidal membrane and lumen. With the purpose to help researchers of concerned disciplines to identify such chloroplasts, we described herein the morphologies of functional and redifferentiating chloroplasts in various members of Tracheophyta. The most obvious sign of redifferentiation is a tremendous swelling of the chloroplast which turns obese. De novo genesis of osmiophilic materials is also characteristic, either as single dots attached to the inner face of the swollen thylakoidal membrane which will yield the tannosomes, or as pearl necklace-shaped structures protruding into the lumen; this last formation can be viewed as a giant tannosome forming finally stromal chlorotannic accretions. Whatever their mode of formation is, tannosomes are expulsed from the chloroplast as shuttles.
Reflected BSDEs Driven by Lévy Processes and Countable Brownian Motions  [PDF]
Jean-Marc Owo
Applied Mathematics (AM) , 2015, DOI: 10.4236/am.2015.614197
Abstract: A new class of reflected backward stochastic differential equations (RBSDEs) driven by Teugels martingales associated with Lévy process and Countable Brownian Motions are investigated. Via approximation, the existence and uniqueness of solution to this kind of RBSDEs are obtained.
Software Measurement Methods: An Analysis of Two Designs  [PDF]
Jean-Marc Desharnais, Alain Abran
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.510092
Abstract: In software engineering, software measures are often proposed without precise identification of the measurable concepts they attempt to quantify: consequently, the numbers obtained are challenging to reproduce in different measurement contexts and to interpret, either as base measures or in combination as derived measures. The lack of consistency when using base measures in data collection can affect both data preparation and data analysis. This paper analyzes the similarities and differences across three different views of measurement methods (ISO International Vocabulary on Metrology, ISO 15939, and ISO 25021), and uses a process proposed for the design of software measurement methods to analyze two examples of such methods selected from the literature.
Monocyte TREM-1 membrane expression in non-infectious inflammation
Jean-Marc Cavaillon
Critical Care , 2009, DOI: 10.1186/cc7882
Abstract: The report by Isibasi's team published in the present issue of Critical Care shows that the enhanced expression of triggering receptor expressed on myeloid cells 1 (TREM-1) on circulating monocytes in patients with acute pancreatitis is independent of the occurrence of infection [1]. This study further illustrates the difficulty of defining soluble or cell surface markers that would allow delimiting a neat border between infection and sterile or non-infectious inflammation. The recently characterized damage (or danger)-associated molecular patterns that emerged from the theory of danger model proposed by Matzinger [2], and the pathogen-associated molecular patterns that came to light after the revised definition of innate immunity by Janeway [3], are the key elements that unify infectious and non-infectious inflammation. Indeed, the fact that the same Toll-like receptors (TLRs) and NOD-like receptors recognize both damage (or danger)-associated molecular patterns and pathogen-associated molecular patterns explains how similar cascades of events are occurring during inflammation independently of infection.TREM-1 was first identified in sepsis [4], and its released form (soluble TREM-1) has been long claimed as a marker of infection [5]. Recent investigations, however, have shown that soluble TREM-1 levels or TREM-1 membrane expression is also enhanced in patients with non-infectious inflammatory disorders, such as chronic obstructive pulmonary disease [6], and in resuscitated patients after cardiac arrest [7] or after cardiac or abdominal surgery [7,8]. TREM-1 is a key actor of the inflammatory process. Anti-TREM-1 antibodies have been used to mimic TREM-1 ligand, which remains to be fully characterized. Not only do these antibodies activate monocytes and neutrophils to produce cytokines [9], but they also act in synergy with TLR4, TLR3, and NOD-like receptor ligands [10,11]. TREM-1 surface expression is upregulated by endotoxin [4] and NOD-like receptor ligands [11]
Analogies et contrastes entre l'expédition d'Egypte et le voyage d'Humboldt et Bonpland
Drouin, Jean-Marc;
História, Ciências, Saúde-Manguinhos , 2001, DOI: 10.1590/S0104-59702001000500003
Abstract: alexandre de humbodlt et aimé bonpland avaient prévu de se joindre aux savants de l'expédition fran?aise en egypte. ayant d? renoncer à ce projet et ayant obtenu l'autorisation du gouvernement espagnol, il réalisèrent leur voyage en amérique latine. la quasi-simultanéité des deux expéditions invite à une comparaison. les points communs ne manquent pas: la production éditoriale au retour, le souci de rendre la science visible, l'importance du repérage spatial et de la collecte naturalistes. cependant, malgré ces ressemblances, le rapport aux pays étudiés est assez contrasté dans ces deux voyages: non seulement à cause du cadre politique mais aussi parce que la conception du travail scientifique est différente. tandis que l'expédition d'egypte réduit seulement la distance du terrain au cabinet sans changer fondamentalement la nature de leur rapport, humboldt transforme le terrain en laboratoire.
Vers une économique politique des conflits au ras du sol
Jean-Marc Ela
Africa Development , 1999,
Abstract: To what extent is conflict central to the day-to-day life in Africa, where millions of men and women are confronted with the crises of the state and the economy as a result of adjustment and globalization processes underway? The paper highlights that the dynamics of violence are deeply rooted in the day-to-day life and sheds light on the crises undermining the very foundations of African societies. It argues that such an understanding forces us to recognise the `disenchantment' process unfolding in contemporary Africa, revisit the logics of frustration and exclusion affecting weakened communities (populations) and to grasp the origins of the conflicts in Africa today. Africa Development 1999, Vol. XXIV, Nos 3 & 4, 103-134
Is Houston Turning Green?
Jean-Marc Zaninetti
Bulletin of Geography. Socio-economic Series , 2009, DOI: 10.2478/v10089-009-0008-z
Abstract: Houston metropolitan area is ranking now the 6th largest in the US, with a growth of 1 million people in 8 years. Despite its success story, Houston suffers from a long-standing environmental bad press. The city is well known for its lack of zoning. However, Houston officials display considerable efforts to "green" their city and improve its reputation. This new policy orientation raises interesting research questions about its effective adaptive capacity to the emerging pattern of sustainable development. This paper aims at assessing the strength and weaknesses of Houston metro area in the framework of the requirements of sustainable development.
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