Cet article décrit et analyse du point de vue de leurs évolutions majeures, les finalités des formations en alternance des maisons familiales rurales, une des principales institutions privées de l’enseignement agricole technique en France. Cette pédagogie de l’alternance est issue du syndicalisme agricole qui a défini les modes d’intervention des agents de formation, appelés les moniteurs. L’alternance, construite au départ contre l’enseignement primaire public, avait pour principal but de restaurer la famille paysanne en tant qu’instance éducative légitime, considérée comme détentrice (...) du monopole de la transmission des savoirs agricoles. Toutefois, à partir des années 1960, cette finalité initiale disparaît. Avec la massification scolaire, les formations en alternance jouent désormais un rôle d’école de la seconde chance oscillant entre une fonction de professionnalisation et une fonction de remédiation scolaire. Au cours d’une troisième période, identifiée à partir des années 1990, au moment de la création des maisons familiales urbaines, ces deux fonctions vont se rejoindre, ce dont témoigne l’évolution du rôle de moniteur : il devient un adulte référent et un « tuteur » pour des jeunes en difficulté se préparant à entrer dans la vie d’adulte. (shrink)

In this paper we give a differential lifting principle which provides a general method to geometrically axiomatize the model companion (if it exists) of some theories of differential topological fields. The topological fields we consider here are in fact topological systems in the sense of van den Dries, and the lifting principle we develop is a generalization of the geometric axiomatization of the theory DCF₀ given by Pierce and Pillay. Moreover, it provides a geometric alternative to the axiomatizations obtained by (...) Tressl and Guzy/Point in separate papers where the authors also build general schemes of axioms for some model complete theories of differential fields. We first characterize the existentially closed models of a given theory of differential topological fields and then, under an additional hypothesis of largeness, we show how to modify this characterization to get a general scheme of first-order axioms for the model companion of any large theory of differential topological fields. We conclude with an application of this lifting principle proving that, in existentially closed models of a large theory of differential topological fields, the jet-spaces are dense in their ambient topological space. (shrink)

In this paper we develop a differential analogue of o-minimal cell decomposition for the theory CODF of closed ordered differential fields. Thanks to this differential cell decomposition we define a well-behaving dimension function on the class of definable sets in CODF. We conclude this paper by proving that this dimension is closely related to both the usual differential transcendence degree and the topological dimension associated, in this case, with a natural differential topology on ordered differential fields.

This book is a survey of the developments in psychoanalytical knowledge resulting from her work. Her main discoveries relate to the very early phases of mental life. She recognized that the world of unconscious feeling and impulse (which we call 'phantasy') is the effective source of all human actions and reactions.

In [T. Brihaye, C. Michaux, C. Rivière, Cell decomposition and dimension function in the theory of closed ordered differential fields, Ann. Pure Appl. Logic .] the authors proved a cell decomposition theorem for the theory of closed ordered differential fields which generalizes the usual Cell Decomposition Theorem for o-minimal structures. As a consequence of this result, a well-behaving dimension function on definable sets in CODF was introduced. Here we continue the study of this cell decomposition in CODF by proving (...) three additional results. We first discuss the relation between the δ-cells introduced in the above-mentioned reference and the notion of Kolchin polynomial in differential algebra. We then prove two generalizations of classical decomposition theorems in o-minimal structures. More exactly we give a theorem of decomposition into definably d-connected components and a differential cell decomposition theorem for a particular class of definable functions in CODF. (shrink)

In his Ph.D. thesis [7], L. van den Dries studied the model theory of fields with finitely many orderings and valuations where all open sets according to the topology defined by an order or a valuation is globally dense according with all other orderings and valuations. Van den Dries proved that the theory of these fields is companionable and that the theory of the companion is decidable .In this paper we study the case where the fields are expanded with finitely (...) many orderings and an independent derivation. We show that the theory of these fields still admits a model companion in the language Lequation image = {+, –, ·, D, <1, …, shrink)

Tout pouvoir politique se manifeste et par sa maîtrise de la contrainte et par la possibilité qu'il a de se dramatiser dans des cérémonies qui visent à intégrer et à mobiliser les administrés pour des actions communes. Il affirme simultanément sa légitimité, ses hiérarchies et ses priorités. Les exemples des rites du protocole, des élections municipales, des inaugurations et intronisations énoncent comment le politique se donne en spectacle et quels effets sociaux produisent de telles démonstrations. Outre les conditions les plus (...) favorables à l'apparition des rites, sont examinées la dynamique et l'obsolescence de ceux-ci selon les régimes politiques, ainsi que les raisons expliquant l'intérêt actuel des anthropologues pour les liturgies politiques.All political power is manifested and his mastery of stress and the ability he has to dramatize in ceremonies designed to integrate and mobilize administered for joint actions. He says its legitimacy simultaneously, hierarchies and priorities. Examples of rites protocol, municipal elections, inaugurations and state inductions how politics makes a spectacle and what social effects produce such demonstrations. In addition to the conditions most favorable to the emergence of rites are examined the dynamics and obsolescence as these political regimes, as well as the reasons for the current interest anthropologists liturgies for politicians. (shrink)

The principle of democracy is one of equal dignity for all cultures. But today the relationship between culture and politics, though close, often appears tense and occasionally contradictory. The introduction to this issue of Diogenes sketches the work done by UNESCO in the frame of the 'Pathways of Thought' Programme, particularly relating to the way in which a pluralist identity is created in multicultural nations, and to the relationship between non-material heritage, democracy and the quest for new forms of governance.

RésuméEn introduisant les concepts disjoints de temps et d'espace absolus, Newton dote la physique d'un double cadre encore reçu au début du XXe siècle. Par l'énoncé du principe de Relativité restreinte, Einstein joint les dew cadres en un seul, l'espace‐temps, lui‐même disjoint de son contenu, l'univers physique. Par le biais du principe d'équivalence, la Relativité générale réalise la fusion du cadre de l'espace‐temps et de son contenu, l'univers physique. Cette vision «classique» est cependant perturbée par les conséquences des principes de (...) la Physique quantique, qui jettent comme une sorte de voile sur la structure spatio‐temporelle de l'espace‐temps relativiste, fondement de la Cosmologie contemporaine: le concept même d'espace‐temps, plus précisément sa séparabilité sont remis en question.Il en résulte une situation de précarité qui affecte jusqu'aux modkles d'univers fournis par la Cosmologie contemporaine, celui du Grand Boum compris. (shrink)

A tissue is a geometrical, space-filling, random cellular network; it remains in this steady state while individual cells divide. Cell division is a local, elementary topological transformation which establishes statistical equilibrium of the structure. We describe the physical conditions to maintain stationary the epidermis (of mammals or of the cucumber), in spite of the fact that cells constantly divide and die. Specifically, we study the statistical equilibrium of the basal layer, a corrugated surface filled with cells, constituting a two-dimensional topological (...) froth. Cells divide and detach from the basal layer, and these two topological transformations are responsible for the stationary state of the epidermis. The topological froth is capable of responding rapidly and locally to external constraints, and is a good illustration of the plasticity of random cellular networks.Statistical equilibrium is controlled by entropy, both as a measure of disorder and as information, and is characterized by observable relations between average cell shapes and sizes. The technique can be applied to any random cellular network in dynamical equilibrium. Mitosis as the dominating topological transformation and the fact that the distribution of cell shapes is very narrow are the only inputs specific to biology. (shrink)

RésuméLe dosage de traces de molécules organiques dans les matrices biologiques fait appel à des techniques analytiques physico‐chimiques dont la chromatographie en phase gazeuse couplée à la spectrumétrie de masse est une des plus puissantes. Des possibilityés nouvelles pour augmenter la sensibilityé de la détection de ces substances sont presentees et mises en relation avec la signification physiologique des résultats obtenus.SummaryGas chromatography‐mass spectrometry is the method of choice for the quantitative determination of organic traces in biological systems. New technical developments (...) allow higher sensitivity and greater specificity which are discussed together with the physiological meaning of the data thus obtained.ZusammenfassungDie Dosierung der Spuren von organischen Molekülen in den biologischen Matrizen erfordert physico‐chemische analytische Techniken, deren Chromatographie in gasförmiger Phase ver‐bunden mit der Massenspektrometrie eine der mächtigsten ist. Es werden neue Möglichkeiten zur Steigerung der Empfindlichkeit der Aufweisung dieser Substanzen vorgelegt, und mit der physio‐logischen Bedeutung der erhaltenen Ergebnisse in Beziehung gesetzt. (shrink)