Localization of algebras over coloured operads

We give sufficient conditions for homotopical localization functors to preserve algebras over coloured operads in monoidal model categories. Our approach encompasses a number of previous results about preservation of structures under localizations, such as loop spaces or infinite loop spaces, and provides new results of the same kind. For instance, under suitable assumptions, homotopical localizations preserve ring spectra (in the strict sense, not only up to homotopy), modules over ring spectra, and algebras over commutative ring spectra, as well as ring maps, module maps, and algebra maps. It is principally the treatment of module spectra and their maps that led us to the use of coloured operads (also called enriched multicategories) in this context.

A model structure for coloured operads in symmetric spectra

We describe a model structure for coloured operads with values in the category of symmetric spectra (with the positive model structure), in which fibrations and weak equivalences are defined at the level of the underlying collections. This allows us to treat R-module spectra (where R is a cofibrant ring spectrum) as algebras over a cofibrant spectrum-valued operad with R as its first term. Using this model structure, we give sufficient conditions for homotopical localizations in the category of symmetric spectra to preserve module structures.

The chemical variability at the surface of Mars: implications for exogenic processes

The chemical composition of sediments and rocks, as well as their distribution at theMartian surface, represent a long term archive of processes, which have formed theplanetary surface. A survey of chemical compositions by means of Compositional DataAnalysis represents a valuable tool to extract direct evidence for weathering processesand allows to quantify weathering and sedimentation rates. clr-biplot techniques areapplied for visualization of chemical relationships across the surface (“chemical maps”).The variability among individual suites of data is further analyzed by means of clr-PCA,in order to extract chemical alteration vectors between fresh rocks and their crusts andfor an assessment of different source reservoirs accessible to soil formation. Bothtechniques are applied to elucidate the influence of remote weathering by combinedanalysis of several soil forming branches. Vector analysis in the Simplex provides theopportunity to study atmosphere surface interactions, including the role andcomposition of volcanic gases

Réquiem por la muerte del yo artista

RÉQUIEM POR LA MUERTE DEL YO ARTISTA es un proyecto audiovisual en forma de performance sobre la música del compositor finlandés contemporáneo Einojuhani Rautavaara, los Requiem del poeta alemán Rainer Maria Rilke y la concepción filosófica del arte y su comercialidad del artista americano Andy Warhol. RÉQUIEM POR LA MUERTE DEL YO ARTISTA es mi sangre. Es mi compromiso. Trata sobre la dualidad entre el artista y la persona, y cómo esto afecta a nuestro arte. RÉQUIEM POR LA MUERTE DEL YO ARTISTA es una operación de corazón. Es provocación; es sobre vomitar tu mente y estar sediento de futuro. Es comerte a ti mismo. Pero sobre todo, es mi concepción de arte: arte es todo aquello por lo que el creador esté dispuesto a morir.