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Search Results: 1 - 10 of 706376 matches for " Jér?me de Wouters d'Oplinter "
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Partially Directed Snake Polyominoes
Alain Goupil,Marie-Eve Pellerin,Jérme de Wouters d'Oplinter
Mathematics , 2013,
Abstract: The goal of this paper is to study the family of snake polyominoes. More precisely, we focus our attention on the class of partially directed snakes. We establish functional equations and length generating functions of two dimensional, three dimensional and then $N$ dimensional partially directed snake polyominoes. We then turn our attention to partially directed snakes inscribed in a $b\times k$ rectangle and we establish two-variable generating functions, with respect to height $k$ and length $n$ of the snakes. We include observations on the relationship between snake polyominoes and self-avoiding walks. We conclude with a discussion on inscribed snakes polyominoes of maximal length which lead us to the formulation of a conjecture encountered in the course of our investigations.
Les collections scientifiques de l’université Bordeaux 1. Sciences et Technologies
Jérme de La No?
In Situ : Revue de Patrimoines , 2012, DOI: 10.4000/insitu.1987
Abstract: De nombreuses universités scientifiques possèdent des collections. L’université Bordeaux 1 possède neuf grandes collections concernant les domaines de la préhistoire, de l’anthropologie, de la géologie terrestre et marine, de la paléontologie et micropaléontologie, de la biologie, de l’astronomie et d’un fonds ancien et moderne d’ouvrages scientifiques. Certaines collections sont riches de milliers de spécimens : fossiles d’invertébrés, ossements de vertébrés, silex taillés, ossements humains préhistoriques ou historiques, animaux naturalisés, carottes de sédiments, instruments d’astronomie et livres anciens. Ces collections ont été constituées par des privés ou des chercheurs et ont ensuite été léguées à l’université. Il est important d’identifier les collectionneurs et surtout les motivations qui ont guidé leurs choix : recherche, enseignement, passion. Entre histoires personnelles et histoires locales, ce regard sur les collections est aussi une porte ouverte sur l’histoire des Sciences. Most major scientific universities own numerous collections. The Bordeaux 1 University has nine large collections in various scientific fields such as Prehistory, Anthropology, Geology, Oceanography, Palaeontology and Micropalaeontology, Biology, Astronomy and patrimonial and modern scientific books and documentation. Some collections are wealth of thousands of specimens : invertebrate fossils, vertebrate bones, flints, prehistoric and historic human bones, naturalised animals, sediment cores, astronomy instruments et old books. Such collections were built up by private persons, researchers and academics who have bequeathed them to the university. It is quite important to identify all collectors and mainly to understand what were the motives which guided their choices : research, teaching, passion. Between personal and local histories, such a look at university collections is also an open door to history of sciences.
Sendov conjecture for high degree polynomials
Jérme Dégot
Mathematics , 2011,
Abstract: Sendov conjecture tells that if $P$ denotes a complex polynomial having all his zeros in the closed unit disk and $a$ denote a zero of $P$, the closed disk of center $a$ and radius 1 contains a zero of the derivative $P'$. The main result of this paper is a proof of Sendov conjecture when the polynomial $P$ has a degree higher than a fixed integer $N$. We will give estimates of its integer $N$ in terms of $|a|$. To obtain this result, we will study the geometry of the zeros and critical points (i.e. zeros of $P'$) of a polynomial which would contradict Sendov conjecture.
Ionospheric plasma density structures associated with magnetopause motion: a case study using the Cluster spacecraft and the EISCAT Svalbard Radar
J. De Keyser, G. Gustafsson, M. Roth, F. Darrouzet, M. Dunlop, H. Rème, A. Fazakerley, P. Décréau,N. Cornilleau-Wehrlin
Annales Geophysicae (ANGEO) , 2004,
Abstract: Multi-spacecraft data from Cluster allow for a more detailed magnetopause and boundary layer structure determination than ever before. Reconstruction methods, in which the time variability observed during a pass is interpreted as being due to boundary motion and/or spatial structure, are particularly well suited for this task. Such methods rely on the availability of plasma and field data and adopt the tangential discontinuity hypothesis to determine the motion, acceleration, boundary structure, boundary curvature and surface wave speed over an extended time interval. In this paper one- and two-dimensional reconstruction methods are applied to multi-spacecraft data for the first time.
Particle Deposition in a Child Respiratory Tract Model: In Vivo Regional Deposition of Fine and Ultrafine Aerosols in Baboons
Iolanda Albuquerque-Silva, Laurent Vecellio, Marc Durand, John Avet, Déborah Le Pennec, Michèle de Monte, Jérme Montharu, Patrice Diot, Michèle Cottier, Francis Dubois, Jérémie Pourchez
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0095456
Abstract: To relate exposure to adverse health effects, it is necessary to know where particles in the submicron range deposit in the respiratory tract. The possibly higher vulnerability of children requires specific inhalation studies. However, radio-aerosol deposition experiments involving children are rare because of ethical restrictions related to radiation exposure. Thus, an in vivo study was conducted using three baboons as a child respiratory tract model to assess regional deposition patterns (thoracic region vs. extrathoracic region) of radioactive polydisperse aerosols ([d16–d84], equal to [0.15 μm–0.5 μm], [0.25 μm–1 μm], or [1 μm–9 μm]). Results clearly demonstrated that aerosol deposition within the thoracic region and the extrathoraic region varied substantially according to particle size. High deposition in the extrathoracic region was observed for the [1 μm–9 μm] aerosol (72%±17%). The [0.15 μm–0.5 μm] aerosol was associated almost exclusively with thoracic region deposition (84%±4%). Airborne particles in the range of [0.25 μm–1 μm] showed an intermediate deposition pattern, with 49%±8% in the extrathoracic region and 51%±8% in the thoracic region. Finally, comparison of baboon and human inhalation experiments for the [1 μm–9 μm] aerosol showed similar regional deposition, leading to the conclusion that regional deposition is species-independent for this airborne particle sizes.
Propagande fran aise en Irlande pendant la Première Guerre mondiale : autopsie d’un échec French Propaganda in Ireland during the First World War: Post-mortem of a Failure
Jérme aan de Wiel
Revue LISA / LISA e-journal , 2009, DOI: 10.4000/lisa.490
Abstract: This article deals with French propaganda efforts in Ireland during the First World War, a theme hitherto unexplored. In 1914, Ireland was in the grip of war fever like other European countries. In the early months of the conflict, thousands of Irishmen (nationalists and unionists) enlisted in the British army. Soon, however, the number of recruits dropped dramatically as various British recruitment organisations blundered and as British propaganda was rather useless. The French government deemed that tens of thousands of Irishmen could be recruited, and Irish recruitment was all the more important since the human cost of the battles of Verdun and the Somme was ghastly. The French knew the British were in a most awkward situation in Ireland, especially after the Easter Rising of April 1916. They decided to begin their own propaganda campaigns in the country with the approval of the British authorities. First, the French focused their attention on political leaders, then on the Catholic Church. The article analyses the approach taken by the French and shows that the Entente Cordiale of 1904 and the Law of the Separation between the Churches and the State of 1905, among others, were serious obstacles to effective propaganda.
Propagande et contre-propagande en Irlande pendant la Première Guerre mondiale Propaganda and Counter-propaganda in Ireland during World War I
Jérme aan de Wiel
Revue LISA / LISA e-journal , 2009, DOI: 10.4000/lisa.1980
Abstract: The First World War caused a major propaganda battle in Ireland between, on the one hand, the constitutional Nationalist Party, led by John Redmond, and the British authorities who were both in favour of the war and voluntary recruitment, and on the other hand, Sinn Féin, opposition nationalists and also a few Catholic clergymen who were against the British war effort in the country, deeming that the home rule crisis had not been dealt with in a satisfactory way. This article aims at shedding light on the confrontation between the two sides. It seems that the British authorities were rather disorganised in their various propaganda campaigns, while Sinn Fein pursued an energetic and sometimes vitriolic anti-war campaign. One of the themes used by the latter was France’s pre-war anti-clerical policy. This article will consider the extent to which propaganda and “counter-propaganda” influenced voluntary recruitment in Ireland where conscription was not imposed.
Moment bounds for dependent sequences in smooth Banach spaces
Jérme Dedecker,Florence Merlevède
Mathematics , 2014,
Abstract: We prove a Marcinkiewicz-Zygmund type inequality for random variables taking values in a smooth Banach space. Next, we obtain some sharp concentration inequalities for the empirical measure of $\{T, T^2, \cdots, T^n\}$, on a class of smooth functions, when $T$ belongs to a class of nonuniformly expanding maps of the unit interval.
Behavior of the Wasserstein distance between the empirical and the marginal distributions of stationary $α$-dependent sequences
Jérme Dedecker,Florence Merlevède
Mathematics , 2015,
Abstract: We study the Wasserstein distance of order 1 between the empirical distribution and the marginal distribution of stationary $\alpha$-dependent sequences. We prove some moments inequalities of order p for any p $\ge$ 1, and we give some conditions under which the central limit theorem holds. We apply our results to unbounded functions of expanding maps of the interval with a neutral fixed point at zero. The moment inequalities for the Wasserstein distance are similar to the well known von Bahr-Esseen or Rosenthal bounds for partial sums, and seem to be new even in the case of independent and identically distributed random variables.
Three-Factor structure of self-report schizotypal traits in a French nonclinical sample  [PDF]
Jérme Brunelin, Patrick Dumas, Mohamed Saoud, Thierry d’Amato, Emmanuel Poulet
Open Journal of Psychiatry (OJPsych) , 2011, DOI: 10.4236/ojpsych.2011.13016
Abstract: Evidence suggests that the structure of psychosis-proneness in the general population may involve three distinct related dimensions. Therefore we conducted a study, using a wider range of measures, to explore the factorial structure of schizotypy assessed by a mixed self-report Schizotypal Traits Questionnaire (mSTQ) in young French healthy individuals. Raine’s Schizotypal Personality Questionnaire [SPQ] and four of the Chapman’s scales [Magical Ideation Scale-MIS; Perceptual Aberration Scale-PAS; Revised Physical Anhedonia Scale-PhA and Revised Social Anhedonia Scale-SA] were combined to form a mSTQ which was administered to 232 French undergraduate students aged from 18 to 25 years old. A Principal Component Analysis [PCA] was carried out on scores for each scale to examine the factorial structure of schizotypal traits in this sample. PCA evidenced a three-factor model of schizotypy in the sample as a whole and even in the lower score sub-sample. The three factors were “positive or cognitive-perceptual”, “negative or social-interpersonal” and “disorganization” latent. Schizotypy, as assessed by these scales, is a multidimensional construct composed by at least three dimensions in this nonclinical sample. This factorial structure is similar to those of schizophrenia symptoms which raise the hypothesis of a continuum from normality to schizophrenia via schizotypal traits
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