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Search Results: 1 - 10 of 7864 matches for " Philippe Rigo "
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Simplified Analytical Method for Estimating the Resistance of Lock Gates to Ship Impacts
Lo c Buldgen,Hervé Le Sourne,Philippe Rigo
Journal of Applied Mathematics , 2012, DOI: 10.1155/2012/763849
Abstract: The present paper is concerned with the design of lock gates submitted to ship impacts. In this paper, a simplified analytical method is presented to evaluate the resistance of such structures under collision. The basic idea is to assume that the resistance is first provided through a local deforming mode, corresponding to a localized crushing of some impacted structural elements. For consecutive larger deformations, the resistance is then mostly provided through a global deforming mode, corresponding to an overall movement of the entire gate. For assessing the resistance in the case of the local deforming mode, the structure is divided into a given number of large structural entities called “superelements.” For each of them, a relation between the resistance of the gate and the penetration of the striking ship is established. However, as some results are already available in the literature, this subject is not treated extensively in this paper. On the contrary, the calculation of the resistance of the gate provided through the global mode is detailed and the strategy to switch from local to global deformation is highlighted. Finally, we propose to validate our developments by making a comparison between results obtained numerically and those predicted by the present analytical approach.
Coronary flow reserve in stress-echo lab. From pathophysiologic toy to diagnostic tool
Fausto Rigo
Cardiovascular Ultrasound , 2005, DOI: 10.1186/1476-7120-3-8
Abstract: Normally coronary blood flow can increase approximately four-to-six fold to meet increasing myocardial oxygen demands. This effect is mediated by vasodilation at the arteriolar bed, which reduces vascular resistance, thereby augmenting flow. The coronary reserve (CFR) represents the capacity of the coronary circulation to dilate following an increase in myocardial metabolic demands and can be expressed by the difference between the hyperemic flow and the resting flow curve (figure 1). In 1974, Lance K Gould [1] proposed the relationship between the anatomic condition and behaviour of coronary hyperaemic flow (figure2), whereby an inverse curvilinear relationship exists between the narrowing of lumen of coronary artery and hyperaemic capability, up to a completely abolished coronary reserve for stenosis >90%. This experimental paradigm can be accurately reproduced clinically in highly selected series of patients with single vessel disease, no myocardial infarction, no coronary collateral circulation, normal baseline function, no left ventricular hypertrophy, without evidence of coronary vasospasm, and off therapy at the time of testing. The perfect, predictable relationship found in the experimental animal or in a very selected patient population [2] is not so perfect in clinical practice [3,4], where many variables can modulate the imperfect match between epicardial coronary artery stenosis and coronary flow reserve (figure 2), such as the geometric characteristics of the stenosis, the presence of coronary collateral circulation, the microvascular component of coronary resistance, the presence of left ventricular hypertrophy modulating the myocardial extravascular component of coronary resistance, the viable or necrotic state of the myocardium distal to the stenosis, the presence of coronary macrovascular or microvascular spasm, and, last but not least, the presence of concomitant anti-ischemic therapy.Up to now, coronary flow reserve has been evaluated invasively i
Differential diagnosis of back pain in adult scoliosis (non operated patients)
Rigo Manuel
Scoliosis , 2010, DOI: 10.1186/1748-7161-5-s1-o44
Towards a characterization of the star-free sets of integers
Michel Rigo
Computer Science , 2001,
Abstract: Let U be a numeration system, a set X of integers is U-star-free if the set made up of the U-representations of the elements in X is a star-free regular language. Answering a question of A. de Luca and A. Restivo, we obtain a complete logical characterization of the U-star-free sets of integers for suitable numeration systems related to a Pisot number and in particular for integer base systems. For these latter systems, we study as well the problem of the base dependence. Finally, the case of k-adic systems is also investigated.
Numeration Systems: a Link between Number Theory and Formal Language Theory
Michel Rigo
Computer Science , 2012,
Abstract: We survey facts mostly emerging from the seminal results of Alan Cobham obtained in the late sixties and early seventies. We do not attempt to be exhaustive but try instead to give some personal interpretations and some research directions. We discuss the notion of numeration systems, recognizable sets of integers and automatic sequences. We briefly sketch some results about transcendence related to the representation of real numbers. We conclude with some applications to combinatorial game theory and verification of infinite-state systems and present a list of open problems.
Numeration systems on a regular language: Arithmetic operations, Recognizability and Formal power series
Michel Rigo
Computer Science , 1999,
Abstract: Generalizations of numeration systems in which N is recognizable by a finite automaton are obtained by describing a lexicographically ordered infinite regular language L over a finite alphabet A. For these systems, we obtain a characterization of recognizable sets of integers in terms of rational formal series. We also show that, if the complexity of L is Theta (n^q) (resp. if L is the complement of a polynomial language), then multiplication by an integer k preserves recognizability only if k=t^{q+1} (resp. if k is not a power of the cardinality of A) for some integer t. Finally, we obtain sufficient conditions for the notions of recognizability and U-recognizability to be equivalent, where U is some positional numeration system related to a sequence of integers.
Generalization of automatic sequences for numeration systems on a regular language
Michel Rigo
Computer Science , 1999,
Abstract: Let L be an infinite regular language on a totally ordered alphabet (A,<). Feeding a finite deterministic automaton (with output) with the words of L enumerated lexicographically with respect to < leads to an infinite sequence over the output alphabet of the automaton. This process generalizes the concept of k-automatic sequence for abstract numeration systems on a regular language (instead of systems in base k). Here, I study the first properties of these sequences and their relations with numeration systems.
Construction of regular languages and recognizability of polynomials
Michel Rigo
Computer Science , 1999,
Abstract: A generalization of numeration system in which the set N of the natural numbers is recognizable by finite automata can be obtained by describing a lexicographically ordered infinite regular language. Here we show that if P belonging to Q[x] is a polynomial such that P(N) is a subset of N then we can construct a numeration system in which the set of representations of P(N) is regular. The main issue in this construction is to setup a regular language with a density function equals to P(n+1)-P(n) for n large enough.
O provedor de justi a europeu e a democratiza o das institui es comunitárias The European ombudsman and the democratization of the EU institutions
Janaína Rigo Santin
Revista Brasileira de Política Internacional , 2012,
Abstract: O artigo visa a analisar as quest es da cidadania europeia e do deficit democrático das institui es supranacionais. Nesse sentido, aborda a institui o do Provedor de Justi a Europeu. Trata-se de um indivíduo nomeado pelo Parlamento Europeu com a fun o de, quer por iniciativa própria quer baseado em queixas que lhe tenham sido apresentadas por cidad os e residentes europeus, investigar e proceder a inquéritos sobre irregularidades na atua o dos órg os comunitários, bem como emitir recomenda es com o fim de corrigir os casos de má administra o e viola o aos direitos humanos por ele detectados. O objeto de atua o do Provedor de Justi a Europeu é o exercício da atividade política e a presta o dos servi os públicos, em ambito comunitário. Trata-se um canal de acesso da cidadania aos órg os de poder político, controlando a má atua o das institui es ou organismos comunitários e a viola o de direitos, com amplos poderes de supervis o no intuito maior que é a persecu o do direito fundamental a uma boa administra o. This paper aims to analyze the questions on the European citizenship and the democratic debt of the supranational institutions. In this sense it addresses the institution of the European Provider of Justice. It is about an individual appointed by the European Parliament with the task of, either by its own initiative or based on complaints presented by European citizens and inhabitants, investigating and proceeding to investigation about irregularities on the actuation of the communitarian organs, as well as to emit recommendations with the aim of correcting the cases of bad administration and violation of the human rights detected by it. The object of actuation of the European Provider of Justice is the enforcement of political activity and the providing of public services in a communitarian set. It is an access channel for the citizenship to the organs of political power, controlling the bad actuation of the institutions or communitarian organisms and the violation of rights, with broad powers of supervision with the aim of the enforcement of the fundamental right to a good administration.
Amizade, pertencimento e rela es de poder no Futebol de Bairro Friendship, bonding, and power relations in neighborhood football Amistad, pertenecimiento y relaciones de poder en el fútbol de barrio
Luiz Carlos Rigo
Pensar a Prática , 2007, DOI: 19806183/rpp.v10i1.194
Abstract: O presente artigo tem como referência empírica o caso da Sociedade Recreativa Arealense, um clube esportivo - recreativo de bairro tradicional da cidade de Pelotas, fundado em 1920. O objetivo é analisar as práticas futebolísticas infames, ou seja, n o famosas. Prioriza-se, no texto, uma reflex o sobre como este futebol se constitui e é constituído por uma sociabilidade específica, por sentimentos de pertencimento e por rela es de poder. Para desenvolver o estudo, foi utilizada uma metodologia que alia fontes orais, escritas e imagéticas. PALAVRAS – CHAVE: futebol – bairro – amizade - pertencimento This articles has, as its empirical reference, the case study of Sociedade Recreativa Arealense, a sports & health club in a traditional neighborhood in the city of Pelotas, founded in 1920. The main aim is to analise non-famous football practices. The text prioritizes a reflection on how these football practices constitute, and are constituted by a specific type of socialization, by feelings of bonding and power relations. The chosen methodology used to develop this research study integrates spoken, written, and pictorial sources. KEYWORDS: football – neighborhood – friendship - bonding El presente artículo tiene como referencia empírica el caso de la Sociedad Recreativa Arealense, un club de barrio deportivo recreativo tradicional de la ciudad de Pelotas, creado en mil novecientos y veinte (1920). El objetivo está en analizar las prácticas futbolísticas infames, es decir, no famosas. Se prioriza, en el texto, una refl exión sobre cómo este fútbol se constituye y es constituido por una sociedad específi ca, por sentimientos de pertenencia y por relaciones de poder. Para desarrollar el estudio, se utilizó una metodología que coliga fuentes orales, fuentes escritas y fuentes de imágenes. PALABRAS – CLAVE: fútbol – barrio – amistad - pertencimento
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