The influence of sediment oxygen heterogeneity, due to bioturbation, on diffusive oxygen flux was investigated. Laboratory experiments were carried out with 3 macrobenthic species presenting different bioturbation behaviour patterns: the polychaetes Nereis diversicolor and Nereis virens, both constructing ventilated galleries in the sediment column, and the gastropod Cyclope neritea, a burrowing species which does not build any structure. Oxygen two-dimensional distribution in sediments was quantified by means of the optical planar optode technique. Diffusive oxygen fluxes and a variability index were (...) calculated on the captured oxygen images. All species increased sediment oxygen heterogeneity compared to the controls without animals. This was particularly noticeable with the polychaetes because of the construction of more or less complex burrows. Integrated diffusive oxygen flux increased with oxygen heterogeneity due to the production of interface available for solute exchanges between overlying water and sediments. This work shows that sediment heterogeneity is an important feature of the control of oxygen exchanges at the sediment–water interface. (shrink)

Flaminia Pischedda Cet article s’intéresse à l’un des textes fondamentaux de la tradition du Classique des changements (Yijing 易經) : le Xici (Commentaire sur les sentences attachées), également connu sous le titre Grand commentaire (Dazhuan 大傳) au Classique des changements. Nous procédons à une analyse formelle du texte, afin d’explorer ses motifs argumentatifs et philosophiques. Sans ignorer la nature composite de ce texte, qui est faite de plusieurs couches superposées, notre analyse sera conduite autant dans le détail du texte (...) que dans ses articulations globales. Nous entendons éclairer la manière dont la structure du texte reflète son contenu. Ainsi, nous montrerons comment un ensemble d’éléments structurels et lexicaux font du Xici un texte élaborant et défendant ses propres arguments, sans qu'il lui soit besoin de recourir à des ressources extra-textuelles. (shrink)

In this paper I propose a discussion of R.G. Collingwood's cultural criticism, as a critique of the modern world, referring, beyond social and political institutions, to definite aspects of everyday existence, such as trends in aesthetics and technology, and to the form of rationality that disciplines the general attitudes of men. For this type of criticism, modernity becomes problematic as a 'form of life'. I therefore intend to provide a commentary of certain passages of Collingwood's writings, in order to reconstruct (...) the historical narrative where the genesis and the development of the modern world is represented as a process full of tensions and contradictions, thus allowingme to stress the coexistence of different patterns in cultural criticism. At the same time, I propose to discuss somemethodological and category problems arising from them: principally the explanatory problem about the specific causal relationships that take into account the traits of modern civilization which are the object of criticism, and the normative problem concerning the criteria applied in this criticism. (shrink)

Keine ausführliche Beschreibung für "Die Natur und Entstehung der Träume" verfügbar.

-- ch. 2. Uchenie o prirode cheloveka v kontekste kriticheskoĭ filosofii -- ch. 3. Kriticheskai︠a︡ transt︠s︡endentalʹnai︠a︡ filosofii︠a︡ kak teorii︠a︡ poznanii︠a︡ i deĭstvii︠a︡.

This book explains why Tocqueville saw the central task of modern statesmanship as combating 'individualism,' a type of civic apathy that he thought capable of robbing modern citizens of human virtue and issuing in a historically unprecedented form of despotism. It looks in depth at the mechanisms he proposed for avoiding the perils and securing the promise of democracy in his own day, and discusses how Tocqueville's insights might be applied in our own time.

Social change; Sufism; doctrines; religious aspects.