Search results for "classes"
showing 10 items of 115 documents
A chaque classe ses élèves : procédures et critères d'affectation à l'école élémentaire
2005
This paper examines the class formation procedures used in French elementary schools, specially when combination classes (with two grade levels) occur. Principals were interviewed about pupils' assignment criteria and at the same time, the class distributional properties of 70 classes were analysed. The results confirm that pupils are sorted into classrooms based on a combination of individual criteria, including gender and academic achievement, in an effort to keep to the initial mix of children. Moreover, principal and teachers assign more independent students to combination classes to ease the burden they place on teachers. These purposeful assignment procedures, which integrate academic…
Universal formulas for characteristic classes on the Hilbert schemes of points on surfaces
2007
This article can be seen as a sequel to the first author's article ``Chern classes of the tangent bundle on the Hilbert scheme of points on the affine plane'', where he calculates the total Chern class of the Hilbert schemes of points on the affine plane by proving a result on the existence of certain universal formulas expressing characteristic classes on the Hilbert schemes in term of Nakajima's creation operators. The purpose of this work is (at least) two-fold. First of all, we clarify the notion of ``universality'' of certain formulas about the cohomology of the Hilbert schemes by defining a universal algebra of creation operators. This helps us to reformulate and extend a lot of the f…
The Bua Group noun class system: Looking for a historical interpretation
2020
International audience; The way Bua languages express number on nouns mostly consists ofalternating suffi xes that bear witness of a former classifi cation system. However,Kulaal is the only present-day language where these markers are not frozen butactually trigger agreement with free, optional determiners that follow the noun andmay show some formal affi nity with its suffi x. For several reasons, previous attemptsat reconstructing a historical noun morphology common to all Bua languagesconsidered the sole suffi xes and neglected the determiners present in Kulaal. But,as is argued in the present paper, more recent data show that, in some cases, presentdaysuffi xes may result from the asso…
Poder local y evolución social en el País Valenciano del siglo XIX
2019
This paper offers the achievements and lacks of the studies on local power in the ancient Kingdom of Valencia during the XIXth century. The breakdown of the Ancien Regime by the liberal revolution is the point of departure. The process of social change started whith the revolution continued ever after the failure of the democratic experience thet begun at 1868. To discuss these topics (not always shared by spanish historians), it would be proposed the analysis of local cases during long-termed periods and a social approach to politics, specially referred to attitudes and action of lower social groups.
Carlo Ginzburg. Cuando el historiador amoneda un símbolo
2020
Resumen En este artículo pretendemos analizar la trayectoria, la contribución, los resultados y la influencia de un historiador de renombre mundial, Carlo Ginzburg. La suya es una investigación de largo recorrido, cuya influencia se ha dado no sólo en esta rama del saber, sino también en muy distintos ámbitos de las humanidades, de las ciencias, de las artes. Carlo Ginzburg ha sido reconocido e identificado principalmente a partir de dos logros historiográficos: la microhistoria y El queso y los gusanos. Por un lado, se le ve como el máximo representante de la microhistoria, la corriente de origen italiano que se expande principalmente en los años ochenta del siglo XX. Por otro lado, a este…
Some families of big and stable bundles on $K3$ surfaces and on their Hilbert schemes of points
2021
Here we investigate meaningful families of vector bundles on a very general polarized $K3$ surface $(X,H)$ and on the corresponding Hyper--Kaehler variety given by the Hilbert scheme of points $X^{[k]}:= {\rm Hilb}^k(X)$, for any integer $k \geqslant 2$. In particular, we prove results concerning bigness and stability of such bundles. First, we give conditions on integers $n$ such that the twist of the tangent bundle of $X$ by the line bundle $nH$ is big and stable on~$X$; we then prove a similar result for a natural twist of the tangent bundle of $X^{[k]}$. Next, we prove global generation, bigness and stability results for tautological bundles on $X^{[k]}$ arising either from line bundles…
IFC and Buildings Lifecycle Management
2008
International audience; This paper presents an extension of the BIM technology that allows to manage information during the entire lifecycle of an AEC project. Usually, AEC projects and facility management are dissociated. Our building information system plays a central role in the improvement of the design and the management process. The building activity generates a great number of data and information of various kinds. The management and the communication of these data by the various participants is complex. Our design and management methods use IFC files to facilitate the sharing process for a better qualification and validation of data.
Mapping properties of weakly singular periodic volume potentials in Roumieu classes
2020
The analysis of the dependence of integral operators on perturbations plays an important role in the study of inverse problems and of perturbed boundary value problems. In this paper, we focus on the mapping properties of the volume potentials with weakly singular periodic kernels. Our main result is to prove that the map which takes a density function and a periodic kernel to a (suitable restriction of the) volume potential is bilinear and continuous with values in a Roumieu class of analytic functions. This result extends to the periodic case of some previous results obtained by the authors for nonperiodic potentials, and it is motivated by the study of perturbation problems for the solut…
SEMANTIC MANAGEMENT OF INTELLIGENT MULTI-AGENTS SYSTEMS IN A 3D ENVIRONMENT
2011
8 pages; International audience; This paper presents a new approach combining the 3D elements composing the environment of mobile agents with semantic descriptors from Building Information Models. Our proposal is based on the IFC standard, which is used in the field of Civil Engineering to build digital models of buildings during the design phase. The semantic of IFC objects composing the 3D environment is used to select and set up 3D objects and elements of simulation scenarios. The result of this process dynamically generates the input files for the JaSIM environment that performs the simulation. These files deserve the representation of the virtual environment in which the simulation is …
Representation of Autonomous Automata
2001
An autonomous automaton is a finite automaton with output in which the input alphabet has cardinality one when special reduced. We define the transition from automata to semigroups via a representation successful if given two incomparable automata (neither simulate the other), the semigroups representing the automata are distinct. We show that representation by the transition semigroup is not successful. We then consider a representation of automata by semigroups of partial transformations. We show that in general transition from automata to semigroups by this representation is not successful either. In fact, the only successful transition presented is the transiton to this semigroup of par…