Search results for "nuit"
showing 10 items of 553 documents
Determination of strain and stress distribution on shearwalls by using the speckle photography technique
2003
Abstract Speckle photography (SP) is a powerful tool that is adequate to determine small displacements in micrometer range. This information shows other characteristics of structure deformation under loads and can be determined as stress and strain distribution. In this paper we present the results of the application of the SP technique used to study the behaviour of discontinuities in a shearwall model. These structural elements are very important to the stability of buildings. The displacement whole field around the discontinuities and loading points was determined using the pointwise method. This allows us to determine stress distribution at the point of interest by means of the suitable…
Absolutely continuous functions in Rn
2005
Abstract For each 0 α 1 we consider a natural n-dimensional extension of the classical notion of absolute continuous function. We compare it with the Malý's and Hencl's definitions. It follows that each α-absolute continuous function is continuous, weak differentiable with gradient in L n , differentiable almost everywhere and satisfies the formula on change of variables.
Homomorphisms on spaces of weakly continuous holomorphic functions
1999
Let X be a Banach space and let $X^{\ast }$ be its topological dual space. We study the algebra ${\cal H}_{w^\ast}(X^{\ast})$ of entire functions on $X^{\ast }$ that are weak-star continuous on bounded sets. We prove that every m-homogeneous polynomial of finite type P on $X^*$ that is weak-star continuous on bounded sets can be written in the form $P=\textstyle\sum\limits _{j=1}^q x_{1j}\cdots x_{mj}$ where $x_{ij} \in X$ , for all i,j. As an application, we characterize convolution homomorphisms on ${\cal H}_{w^\ast}(X^{\ast})$ and on the space ${\cal H}_{wu}(X)$ of entire functions on X which are weakly uniformly continuous on bounded subsets of X, assuming that X * has the approximation…
Study of new joining technique: flat clinching
2007
In this paper a development of clinching, called flat clinching, is presented. After a press clinching process, the joined sheets have been deformed by a punch with a lower diameter against a flat die. In this way a new configuration is created with a geometry that has no discontinuity on the external surface (bottom). A new procedure has also been tested: the second step is perfomed by pressing the joint between two flat dies. This second case has revealed itself to be very effective.Tensile tests have been done to compare the joints strength among the various joining techniques. Moreover some joints have been cut to analyse the changing of the contact line shape and how its characteristic…
“La cosa”, tra l’architettura e il packaging
2015
In questi ultimi decenni le linee di confine fra settori scientifico disciplinari contigui sono diventate, in molti casi, delle trincee invalicabili. Tale pratica ha formato ambiti sempre più specialistici, generando, in alcuni casi, docenti ritenuti indispensabili per raggiungere determinati esiti nella didattica, nella ricerca e nell’attività professionale. Design, architettura e urbanistica sono divenuti compartimenti stagni, subendo un processo involutivo di allontanamento e contraddicendo l’esperienza di molti protagonisti del Movimento Moderno. Partendo da questo stato di fatto, è stato interessante osservare, con lo stesso modus operandi di chi abitualmente si occupa di progettazione…
Singular quasisymmetric mappings in dimensions two and greater
2018
For all $n \geq 2$, we construct a metric space $(X,d)$ and a quasisymmetric mapping $f\colon [0,1]^n \rightarrow X$ with the property that $f^{-1}$ is not absolutely continuous with respect to the Hausdorff $n$-measure on $X$. That is, there exists a Borel set $E \subset [0,1]^n$ with Lebesgue measure $|E|>0$ such that $f(E)$ has Hausdorff $n$-measure zero. The construction may be carried out so that $X$ has finite Hausdorff $n$-measure and $|E|$ is arbitrarily close to 1, or so that $|E| = 1$. This gives a negative answer to a question of Heinonen and Semmes.
Des nuits blanches sous un ciel noir ? La protection de la nuit, nouvelle préoccupation des territoires
2015
ACLN; National audience; Les travaux du Collectif Renoir, à l’interface entre recherche et action, visent à mieux appréhender et à rendre opérationnelles pour les territoires les trois modalités d’action publique – conservation, valorisation, labellisation – à l’oeuvre dans les processus de protection et de patrimonialisation de la nuit en lien avec les préoccupations des transitions énergétique et écologique.
La protection de la nuit d'un haut lieu touristique de montagne : la Réserve internationale de ciel étoilé du Pic du Midi comme nouvelle ressource te…
2017
International audience; « Le ciel nocturne représente, avec ses magni-fiques étoiles et le message qu'il apporte sur notre place dans l'Univers, un précieux trésor pour toute l'humanité. » C'est en ces termes que l'UNESCO, en 1992, considère le ciel étoilé comme nouvelle dimension du patrimoine cultu-rel. Cette première impulsion est relayée par l'International Dark-Sky Association (IDA) en 2000, qui définit le concept de réserve internatio-nale de ciel étoilé (ou RICE) : « La RICE consiste en un partenariat établi entre les différents proprié-taires ou administrateurs du territoire sur la base d'une reconnaissance de la valeur du ciel étoilé, laquelle se concrétise sous forme de réglemen-t…
Continuities and Discontinuities in the Economic Growth of Spain. 1850-1936
1998
The Spanish pattern of economic growth during the last two centuries is quite unique. In the nineteenth century, Spain remained outside the process of industrialization, but during the twentieth century it has joined the small group of developed economies. This article checks the possible existence of discontinuities between 1850-1936 in the series of PNB, industrial production and private and public investment by utilizing recent developments in the econometric analysis associated with the work of Perron and Ziwot and Andrews. The results confirm the continuity of the Spanish growth during the long period considered. However, they also show two breakpoint years: 1870 in the series of indus…
Perturbed Bernstein-type operators
2018
The present paper deals with modifications of Bernstein, Kantorovich, Durrmeyer and genuine Bernstein-Durrmeyer operators. Some previous results are improved in this study. Direct estimates for these operators by means of the first and second modulus of continuity are given. Also the asymptotic formulas for the new operators are proved.