1,721,123 research outputs found
Barclay & Crousse. Segnali di vita tra i due deserti. Barclay & Crousse. Señales de vida entre dos desiertos
No full textLa costa desertica peruviana: una lunghissima linea sul Pacifico che si estende da nord a sud per circa 2400 km, scandita da un sistema regolare di oasi trasversali. Ogni traccia della presenza dell’uomo è spesso occultata da questa natura estrema. Anche le rovine precolombiane, che di rado si incontrano ai margini delle oasi, appaiono come tracce astratte di una natura geometrizzata.
La condizione geografica dell’intero Perù è tale da replicare, sia alla grande sia alla piccola scala, analoghe condizioni insediative. Ogni sua porzione si distingue nettamente dal paesaggio desertico a cui si contrappone, che sia l’immensa distesa oceanica, l’impervio altopiano andino o l’impenetrabile foresta pluviale. Tutti gli insediamenti umani, città o edifici, si configurano spesso come strategiche isole di confine tra due frammenti di deserto.
In questa radicale condizione si inserisce il lavoro che Sandra Barclay e Jean Pierre Crousse sviluppano dalla fine degli anni ’90 fino ad oggi raccontato dal libro di Cacciatore e Foti. Dieci case, progettate e costruite sulla costa pacifica, esprimono chiaramente le straordinarie potenzialità architettoniche insite in questo contesto
Un progetto per Bologna: l'area Staveco da cittadella militare a Campus Universitario. Ateliermap
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On the Assessment and Mitigation of Vortex-Induced-Vibrations of Overhead Electrical Conductors
No full textIn the present work, an extension of the Energy Balance Method (EBM) is investigated, by considering both the dynamic interaction between a conductor and the support system, and the coupling in the dynamic response of two adjacent spans. The presence of dampers in each span to control aeolian vibrations is also taken into account. The modal properties of the line are studied within a rigorous mathematical setting and used as the input to apply the EBM. The parameters that control the dynamics of the structural system are clearly identified, paving the way to the definition of simple yet effective criteria for the design of the mechanical characteristics of the damping devices connected to the line. The proposed procedure allows also to investigate the effects of energy dissipation within flexible supports
Metal-Containing Trifurcate Receptor that Recognizes and Senses Citrate in Water
No full textThe binding tendencies toward carboxylates of a trifurcated receptor containing three copper(II)−cyclam subunits have been investigated in pure water, through the displacement of a fluorescent indicator. The receptor is tailor-made for the recognition of tricarboxylates, e.g., citrate, whose three negatively charged oxygen atoms interact with the three coordinatively unsaturated CuII centers
Minimal requirements for the vibration-based identification of the axial force, the bending stiffness and the flexural boundary conditions in cables
No full textThis paper aims at presenting the guidelines to follow in order to set up an identification procedure which is able to determine the axial force, the flexural rigidity and the rotational end stiffnesses of slender and tensioned structural elements, based on measurements of their natural frequencies and mode shapes. First of all, when such an element is slightly affected by bending stiffness effects, perturbation methods can be applied to get a composite approximation for its natural frequencies and an asymptotic expression for its mode shapes. These simple analytical formulas allow to understand the role played by each model parameter in the modal response and show that the axial force, the flexural rigidity and the rotational end stiffnesses can be correctly identified under some conditions, which are established and provided in this document. Among others, it is necessary that the identification procedure relies on the first few natural frequencies and mode shapes, which are measured near each extremity of the element, as well as some natural frequencies associated with higher modes
Linear dynamics of precast vertical panels cladding industrial frames under earthquake action
No full textEffect of the Environment on the Fatigue Behaviour of Textile Organic Matrix Composite Materials for Aircraft Applications
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