53 research outputs found
Alberto Boatto: la mirada desde el afuera
No full textAlberto Boatto (1929-2017) – uno de los críticos de arte más originales de Italia – ha sido un hombre situado simultáneamente en los márgenes y en el centro de la vida cultural de la época. Fundó y dirigió las revistas Cartabianca, Senzamargine y La città di Riga. Sin ascendencias declaradas, lejano por temperamento tanto de los “críticos poetas” como de los “académicos”, insensible a la transformación del crítico en la omnívora figura del curador, Boatto ejerce una escritura original e inactual. El crítico elude el “sistema” y se queda en el borde practicando una “mirada desde el afuera”. Para él todo pertenece al no-tiempo del arte y ya no cuentan, ni siquiera, las barreras del espacio ni las estacadas que dividen las artes.
El primer avistaje de la Tierra desde el espacio es el acontecimiento que desplazó el punto de vista al exterior del globo y expandió el mapa más allá de cualquier límite terrestre. Aquí surge el fascinante cortocircuito que Boatto genera con la historia del arte moderno. La Tierra se convirtió en un inmenso ready-made; el proceso de simultanea expansión y re-orientación de su imagen aparece en las paginas de La mirada desde el afuera como el epicentro de una mutación de paradigma cultural y antropologico
Ghenos, Eros, Thanatos: a mostra-livro de Alberto Boatto
No full textO artigo a seguir analisa a mostra-livro Ghenos, Eros, Thanatos, de 1974, do crítico de arte italiano Alberto Boatto, buscando identificá-lo como uma proposta crítico-curatorial heterodoxa em relação às principais tendências críticas da arte italiana dos anos 1960 e 1970.
Ellittica, apodittica, decisiva
No full textGhenos Eros Thanatos è il titolo della mostra curata da Alberto Boatto alla galleria de’ Foscherari di Bologna nel 1974, in cui le opere di tredici artisti compivano “un periplo attorno alle situazioni limite della vita”: la nascita, la sessualità, la morte. Il testo che compariva nel “libro-mappa” che accompagnava la mostra è ripubblicato nel volume insieme a una selezione ragionata di articoli, saggi e presentazioni critiche apparsi in riviste e cataloghi oggi di difficile reperibilità. Il saggio affronta i nodi fondamentali dell’attività critica e della biografia intellettuale di Boatto, dalla sua originale ed “eretica” interpretazione del Sessantotto e delle sue conseguenze sulle pratiche artistiche alle riflessioni sul destino dell’artista nell’epoca dello spettacolo, alle considerazioni, ormai in pieno clima postmoderno, sulla relazione tra scrittura e immagine, analizzando la sua posizione nel panorama artistico e culturale del suo tempo
Assessment of a BEMT-based rotor aerodynamic model under uniform aligned steady inflow
No full textThe design of efficient rotor blades is affected by the accuracy of aerodynamic prediction methods for load distributions and power computations. Research showed that the accuracy of BEMT-based industrial codes decreases at high inflow-speed under uniform aligned steady conditions. The identified reasons are inaccuracies in the semi-empirical corrections for 3D effects such as stall delay and tip-losses. This study scrutinizes such corrections by comparison with URANS CFD simulations. Results confirm that the accuracy of the rotor thrust and power coefficients reduces up to 30% for a tip speed ratio of 4. The identified causes in the inboard blade are: (1) a more than twice as large drag coefficient given by the Eggers stall delay correction, (2) a 20% loading overestimation due to the unaccounted root-vortex downwash. Furthermore, the linear interpolation between the cylinder and the DU40 airfoil polars near the root as well as the modeling of 2D separation affect the accuracy at least as much as the stall delay correction at a tip speed ratio of 4. Next, the inadequacy of the Prandtl tip-loss factor at a tip speed ratio of 10 provides 5 to 15% higher loads in the outboard blade. It is recommended to extend stall delay corrections or tune the Prandtl root-loss correction to the location of the maximum chord to capture the root-vortex downwash effect, as the phenomenon is observed on the CFD-extracted lift polar and blade flow streamlines. Finally, 2D RANS simulations of the inboard blade profiles should be compared with the 3D ones from the rotating blade to isolate the effect of stall delay on the pressure and skin friction coefficient distributions to further address the modeling of the drag coefficient
Analisi dei margini di convenienza aziendali-distrettuali in alcuni modelli organizzativi di gestione degli effluenti di allevamento (EA). Un confronto tra casi di riferimento in Veneto
No full textThe topic of this research is the study of new models for the management of livestock effluents, in particular situations of concentration or bad organization, is able to produce negative externality for the environment, especially loss in the underground and surface water of nitrate. This problem of water pollution in one hand is a cost for the community, because the citizen wants clean water and in the other is a cost for the livestock firm, because is constricted to respect an environmental restricted standard, investing in a new organization.
In Veneto region, this problem is strongly felt, because there are many specialized livestock chain like cattle, diary, pigs and poultry in a territory rich of important water bodies, flowing into the drainage basin of the Veneto lagoon.
After a bibliographic research on the current regulation and on the environmental economics in the agricultural field, in particular how the environmental regulation influences on the firms in terms of economics performances, it was designed a theoretical framework where for a livestock firm is possible develop a new and more efficient technology for the manure treatment that allow to improve the water quality and also can make earn or save money.
The context into which livestock waste management inserts itself includes not only constraints already established by standard community regulations for nitrate matter but also special opportunities rendered by the increase in value of biomass energy. These opportunities have become even greater in the past few years due to the governmental incentives which are given to companies producing energy from renewable resources, an incentive program undertaken by the European Union in response to international collaboration (the Kyoto Protocol).
Then it followed the study of the best practices started in the northern Italy, making interviews to the most important stakeholders in the economic, scientific and cultural sphere, aimed to identify the most common organizational and technologic typologies The new proposed models developed by a consortium of firms having the same organizational problem, lack of land for spreading the manure, in a restricted area, that want develop a treatment plant with a first energetic valorization treatment and a second step where is possible to treat the nitrogen element. In this way you can produce electricity (production stimulate with green tariffs), indeed money and with the secondary treatment is possible to recover nitrogen to produce fertilizer (ammonia stripping, compost, drying) or to reduce/destroy it (combustion, biological de-ammonification).
An important part of the study is based on the design of an evaluation model that is able to simulate the economics performances of this integrated chain model, which can manage the nitrogen model in a better and sustainable way. Starting by the regional livestock database, it was analyzed the nitrogen production, the energetic potential of the firms and the biomass volumes. the model evaluated the overnight cost of the investment the overhead costs of each technological step and the revenues. The last and most important phase was to divide the incomes and costs between the farmer developing the model, because each animal species have a different nitrogen content, biogas production level, volume weight, and it means different allocation of money between the members of the consortium.
The study demonstrated that develop an innovation models of livestock effluents treatment is more sustainable and more profitable than the business as usual organization, and confirmed the thesis that environmental regulation has resulted in a “win-win” situation where both profits and environmental performance have improved.
Assessment of Blade Element Momentum Theory-based engineering models for wind turbine rotors under uniform steady inflow
No full textBlade Element Momentum Theory (BEMT) -based approaches provide 15%–20% inaccurate load predictions under uniform steady inflow. Inaccuracies were related to unclear aerodynamic mechanisms causing the Prandtl Tip-Root Loss (TRL) correction to fail at high Tip-Speed Ratio (TSR) and the ambiguous drag coefficient treatment under Stall Delay (SD). With this study, we provide an in-depth flow analysis to explain what physical mechanisms are poorly captured in TRL and SD corrections and offer a potential solution for the improvement of the Prandtl model. Corrections are assessed by comparison with RANS CFD simulations of the NREL 5MW rotor at its design TSR, TSR 4, and TSR 10. The Prandtl tip-loss correction provides 5%–15% higher loading than CFD at TSR 10. The reason is a lower (
) downwash angle of attack, providing a 5%–10% lift coefficient overestimation. We recommend employing the tip-loss correction of Zhong, as it considers the lift coefficient reduction due to the tip-vortex downwash. The investigated Eggers SD correction predicts an incorrect drag coefficient at TSR 4, while a better agreement is found for the lift coefficient. We conclude that only the latter requires a correction for SD in the inboard blade
Intraoperative ultrasound use in pancreatic surgery
No full textThe US intraoperative diagnostic procedure is useful either for the higher sensitivity rate or for the surgical decision making. The Authors' intraoperative diagnostic experience in pancreatic diseases is reported: 23 exocrine and endocrine neoplasms, 3 chronic pancreatitis and 8 acute pancreatitis cases are discussed
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