Lothar Fischer, Helmut Sturm et HP Zimmer : des collectifs engagés à l'enseignement des Beaux-arts en République Fédérale d'Allemagne

International audienceNous présentons les parcours de 4 artistes ouest-allemands issus de l’académie, Lothar Fischer, Helmut Sturm, Hans-Peter Zimmer et Heimrad Prem, aux riches trajectoires artistiques individuelles et collectives ; ils furent les fondateurs du groupe Spur en 1957, l’un des premiers collectifs d’artistes engagés et subversifs à revoir le jour en Allemagne depuis les années 30. 20 ans plus tard, 3 d’entre eux deviennent enseignants des beaux-arts dans différents établissements réputés de République Fédérale d’Allemagne. Nous interrogerons ici la cohérence de l’évolution de leurs théories et pratiques ; nous nous demanderons quelles conséquences leur démarche de création intuitive et expérimentale a pu avoir sur leur pédagogie, et quelle place, quelle forme un tel cadre pouvait laisser à leur engagement pour un changement global de paradigme social

Oligocene magmatic activity and associated mineralization in the polymetallic belt of Central Peru

Les données géochronologiques obtenues à partir des échantillons prélevés dans les districts miniers de Milpo-Atacocha et de Chungar mettent en évidence l'importance des épisodes magmatiques et de l'activité métallogénique à l'Oligocène dans le Pérou centra

Introduction

L’étude de la jeunesse a déjà fait l’objet de nombreux travaux scientifiques ; c’est dans cette dynamique que l’université Clermont-Auvergne, soutenue par sa Maison des Sciences de l’Homme, a mené différents projets depuis une dizaine d’années. En 2005 une première publication pluridisciplinaire, proposait un état des lieux sur la notion de jeunesse et la pluralité de ce qu’elle recouvre ; une seconde, en 2007, se penchait sur les relations qu’elle tissait avec la notion de pouvoir et avec se..

Strike-slip faulting, thrusting and related basins in the Cenozoic evolution of the Southern branch of the Bolivian orocline

The evolution of the Cenozoic deformation of the Cordillera Oriental and of the contact zone with the Altiplano in southern Bolivia is well documented in the Tupiza, Nazareno and Estarca basins. The tectonic evolution started at about 29 Ma. The period between 29 and about 22-21 Ma is marked by developement of a pull-apart basin related to N-S trending left-lateral strike-slip faulting. During this period, initial deposition consisted of andesitic lavas and detrital sediments (breccias ; matrix-supported red conglomerats ; sands and silts...) of the Catati and Tupiza Formation, deposited in alluvial fan and flood plain environments. From 21 to 20 Ma, the tectonic setting evolved to N-S oriented thrusts, which had a dextral component. This event caused the Tupiza basin to evolve into a full-ramp basin, and triggered the developement of two piggy-back basins : Nazareno and Estarca. Both basins record detrital deposition (Nazareno Formation) in an alluvial fan environment. At 10-9 Ma, deformation in this area stopped allowing peneplanation during which time the San Juan de Oro erosional surface was formed and the fluvial conglomerates of the Oploca Formation were deposited. This segment of the Andes was then tectonically transported to the east, while uplift due to thrusting continued in the eastern Andean front and in the Subandean zone. (Résumé d'auteur

Artificial Intelligence for reverse engineering: application to detergents using Raman spectroscopy

The reverse engineering of a complex mixture, regardless of its nature, has become significant today. Being able to quickly assess the potential toxicity of new commercial products in relation to the environment presents a genuine analytical challenge. The development of digital tools (databases, chemometrics, machine learning, etc.) and analytical techniques (Raman spectroscopy, NIR spectroscopy, mass spectrometry, etc.) will allow for the identification of potential toxic molecules. In this article, we use the example of detergent products, whose composition can prove dangerous to humans or the environment, necessitating precise identification and quantification for quality control and regulation purposes. The combination of various digital tools (spectral database, mixture database, experimental design, Chemometrics / Machine Learning algorithm{\ldots}) together with different sample preparation methods (raw sample, or several concentrated / diluted samples) Raman spectroscopy, has enabled the identification of the mixture's constituents and an estimation of its composition. Implementing such strategies across different analytical tools can result in time savings for pollutant identification and contamination assessment in various matrices. This strategy is also applicable in the industrial sector for product or raw material control, as well as for quality control purposes

Continuous control of ionization wave chaos by spatially derived feedback signals

In the positive column of a neon glow discharge, two different types of ionization waves occur simultaneously. The low-dimensional chaos arising from the nonlinear interaction between the two waves is controlled by a continuous feedback technique. The control strategy is derived from the time-delayed autosynchronization method. Two spatially displaced points of observation are used to obtain the control information, using the propagation characteristics of the chaotic wave.Comment: Elsevier-Tex-File, 8 pages, 6 figures, submitted to PL