130,751 research outputs found
Gli insediamenti tradizionali delle Alpi. Conservazione e riuso
No full textIl testo presenta un aggiornamento sulle politiche e le tecniche per la conservazione e valorizzazione degli insediamenti tradizionali delle Alpi. Il libro raccoglie 10 esperienze recenti lungo l’intero Arco Alpino italiano, dagli esperimenti di re - insediamento delle valli del Cuneese e dell’Occitania, alla tutela delle costruzioni d’alta quota nella Vallée, dalle questioni di pianificazione ed economica del territorio in discussione sulle Alpi Centrali, alla tutela dei masi della Val Gardena, fino alla geografia dei Tabià delle Dolomiti venete. Un ampio saggio storico di Giacomo Menini introduce la questione degli insediamenti tradizionali, richiamando gli studi prrotoantropologici di inizio Novecento, da Baragiola a Hunziker. Infine, sono presentati tre recenti progetti “esemplari” per il recupero di questo patrimonio fragile e ancora utile
FIGURE 4. Stachytarpheta salimenae P.H.Cardoso & Menini. A. Habit. B. Leaf, abaxial view. C in Taxonomic updates in Brazilian Stachytarpheta (Verbenaceae) with atropurpureous to black corollas: Two new species and a new synonym
No full textFIGURE 4. Stachytarpheta salimenae P.H.Cardoso & Menini. A. Habit. B. Leaf, abaxial view. C. Leaf, abaxial surface showing detail of indumentum. D. Leaf, adaxial surface showing detail of indumentum. E. Bract, abaxial surface showing the indument. F. Calyx, showing the indument and lacinia. G. Dissected corolla, showing androecium and internal indumentum. H. Gynoecium. I. Fruit. (R.J.V. Alves 9035). Drawn by Klei Sousa.Published as part of Cardoso, Pedro Henrique, Neto, Luiz Menini, Cabral, Andressa & Trovó, Marcelo, 2021, Taxonomic updates in Brazilian Stachytarpheta (Verbenaceae) with atropurpureous to black corollas: Two new species and a new synonym, pp. 167-178 in Phytotaxa 523 (2) on page 174, DOI: 10.11646/phytotaxa.523.2.4, http://zenodo.org/record/558543
Descent theory and Amitsur cohomology of triples
No full textAbstractFor a given triple (monad) U:C→C in the category C, we develop a theory of descent for U. We start by introducing the basic constructions associated to a triple: descent data, symmetry operators, and flat connections. The main result of this section asserts that the sets of these objects are bijectively equivalent. Next we construct a monoidal category C(U) such that U is an algebra in C(U). If C is abelian, we define Amitsur cohomology of U with coefficients in a functor F:C(U)→D. As an application of this construction, in the case where U is faithfully exact, we describe those morphisms that descend with respect to U. In the last part of the paper we classify all U-forms of a given object C0∈C. We show that there is a one-to-one correspondence between the set of equivalence classes of U-forms and a certain noncommutative Amitsur cohomology. Let A/B be an extension of associative unitary rings and let C be the category of right B-modules. Then (−)⊗BA:C→C is a triple which is faithfully exact if and only if the extension A/B is faithfully flat. Specializing our results to this particular setting, we recover faithfully flat descent theory for extensions of (not necessarily commutative) rings
Come acqua pietrificata. Architetture e paesaggi per l'utilizzo della risorsa idrica montana
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