84,046 research outputs found
Minori e adulti stranieri nel sistema dell'istruzione e della formazione professionale in Lombardia: aspetti quantitativi e attività educative
No full textLeonardo e il Novecento: dai futuristi alle mostre leonardesche
No full textIl saggio in catalogo illustra la sezione 8 della mostra "Leonardo di carta in carta. La costruzione del mito fra Ottocento e Novecento", a cura di S. Alessandri, M. Ceriana, S. Mammana (comitato scientifico: S. Alessandri, F. Barbagli, M. Ceriana, D. Colombo, S. Mammana, F. Tognoni, A. Tura, F. Valli, C. Vecce), tenutasi alla Biblioteca Nazionale Centrale di Firenze (BNCF) dal 5 dicembre 2019 al 14 marzo 2020. La sezione della mostra e il saggio sono dedicati a una breve rassegna dello sviluppo del mito di Leonardo a Vinci nei primi decenni del Novecento: dalla irrisione del mito della Gioconda fatto da artisti come Malevic, Duchamp, Picabia, Eluard, Leger e dai futuristi, che, però consideravano il maestro rinascimentale un modello di riferimento, all'influenza esercitata su Balla, Carrà, Fontana, fino alla sequenza di mostre che hanno sancito la definizione del mito di Leonardo scienziato, genio precursore e universale, fatto proprio dalla propaganda fascista, soprattutto con la Mostra Leonardesca del 1939 al Palazzo dell'Arte di Milano.The essay of the catalogue presents the section no. 8 of the exhibition "Leonardo di carta in carta. La costruzione del mito fra Ottocento e Novecento", ed. by S. Alessandri, M. Ceriana, S. Mammana (Scientifi Committee: S. Alessandri, F. Barbagli, M. Ceriana, D. Colombo, S. Mammana, F. Tognoni, A. Tura, F. Valli, C. Vecce), held at Biblioteca Nazionale Centrale in Firenze (BNCF) from December 5 2019 to March 14 2020. The exhibition section and the essay are dedicated to a short portrayal of the development of the myth of Leonardo da Vinci in earlier Twentieth-Century: the derision of myth of Gioconda by artists such as Malevic, Duchamp, Picabia, Eluard, Leger, and by futurists, who, anyway, considered him a model, as well as the influence on Balla, Carrà, and Fontana; moreover the sequence of shows dedicated to Leonardo “scientist”, pioneer and all-round genius, used by propaganda of Fascism, above all thanks to exhibition Leonardesca, held at Palazzo dell’Arte in Milan in 1939
SALVA, CRESCI, SBLOCCA: L’ITALIA E LE MANOVRE ANTICRISI
No full textM. A. Cabiddu – M.C. Colombo (a cura di), Appalti pubblici, in house providing, grandi infrastrutture. Modalità di affidamento lavori e servizi, (ebook), gruppoilSole24ore, Milano, 201
Gli stranieri e la sicurezza
No full textIl contributo affronta due temi. Il primo è costituito dalle politiche di controllo esterne e interne volte a contrastare e ridurre l'immigrazione irregolare; il secondo dal contributo che gli stranieri danno ad alcuni reati inItalia. Lo studio è condotto in una prospettiva di medio periodo e riconduce i principali cambiamenti a fattori politici, geografici e legati al ciclo migratori
Joe Colombo. Progetti di sedute e di un tavolo da disegno
No full textL’analisi dei progetti di Joe Colombo si inserisce nel quadro critico della mostra “Michelangelo e il Novecento” del 2014 con sedi a Firenze e Modena. L’autore ha curato la sezione “Allestimenti e design” della mostra e nel testo analizza i progetti di Colombo in rapporto a riferimenti michelangioleschi
Da solução ao problema: um estudo sobre os conflitos, os impactos sócio-ambientais e as representações sociais envolvidas no uso e na gestão da água do aquífero Karst no município de Colombo (PR)
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Filosofia e Ciencias Humanas. Programa de Pós-graduação em Sociologia PolíticaEsta dissertação trata das representações sociais dos sujeitos envolvidos no uso e na gestão da água do Aqüífero Karst no Município de Colombo (PR), desde o início da sua utilização, em 1995, até os dias atuais. A exploração deste aqüífero, que no seu início tratava-se de uma solução institucional para o problema da falta de água na área urbana de Colombo, tornou-se o cenário de conflitos e impactos sócio-ambientais. Sob a luz do modelo de análise das representações sociais e da gestão patrimonial dos recursos naturais, analisam-se os fatores comuns do conflito e do uso da água entre três categorias de sujeitos envolvidos no uso e gestão da água do Aqüífero Karst: Agricultores, Técnicos da Sanepar e Órgãos Públicos. A pesquisa apontou que o conflito se manifestara, de um lado, pelos agricultores que alegavam a exploração irracional do aqüífero interferindo diretamente na disponibilidade de água dos mesmos para a irrigação da agricultura; e do outro lado, pela Sanepar que alegava a impossibilidade de interromper a captação do aqüífero em função de ser a única solução viável para atender a demanda por água em Colombo. Os resultados da análise das representações sociais dos sujeitos envolvidos, tanto sobre o conflito como em relação aos significados do uso da água, apontaram uma vinculação entre as representações dos sujeitos com o papel social que os mesmos desenvolvem. Na categoria dos Agricultores, os resultados demonstraram que a água representa a manutenção tanto da sobrevivência física como da renda econômica familiar dos sujeitos, sendo causa motivadora do conflito. Na categoria dos Técnicos da Sanepar os resultados vincularam com uma das missões da empresa, o abastecimento público. E nos Órgãos Públicos, os resultados relacionaram-se com a missão social que os mesmos representam, como a gestão, fiscalização, licenciamento ambiental e mediação de conflitos sociais e ambientais. This thesis deals with the social representations of the subjects involved in the use and the management of the water on Karst Aquifer in the City of Colombo (PR), since the beginning of its use, in 1995, until the current days. The exploration of this aquifer, that in its beginning it was about an institutional solution for the problem of the water lack in the urban area of Colombo, became the partner-ambient scene of conflicts and impacts. It was used in this thesis the model of analysis of the social representations and the patrimonial management of the natural resources. One analyzed the common factors of the conflict and of the use of the water on three categories of involved citizens in the use and management of Karst Aquifer water: Farmers, Technicians of Sanepar Company and Public Agencies. The research indicated that the conflict expressed, on the one side, by the farmers claiming that the irrational exploitation of Karst Aquifer interfered directly on the availability of water from them for irrigation agriculture. The other side, by Sanepar claiming the impossibility of stops the capture of this Aquifer in line to be the only viable solution to meet the demand for water in Colombo City. The results of analysis of social representations of the subjects involved, as much on the conflict as in relation to the meanings of the use of the water, pointed a linkage between the representations of the subjects with the social role that they develop. In the category of farmers, the results showed that the water represents both maintenance of the physical survival as of the familiar economic income of the citizens, being the motivating factor of the conflict. In the category of Technicians of Sanepar Company, the results linked with one of the missions of the company, the supply public. And in the Public Agencies, the results related with the social mission that they represent, as the management, supervision, licensing and environmental mediation of social conflicts and environmental
Advanced Modelling of Thermal Plasmas for Industrial Applications
No full textAdvanced Modelling of Thermal Plasmas for Industrial Applications
V. Colombo, E. Ghedini
Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.)
Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy
Modeling results are presented for different industrial thermal plasma sources using a customized version of the commercial code FLUENT capable of 2D and 3D transient simulation with advanced CFD models that take into account turbulence effects using different approaches (Reynolds Stress Model and Large Eddy Simulation), species transport and radiation (Discrete Ordinate Model with interaction between radiation and solid surfaces). Simulations results are presented in order to show the capabilities of this modeling tool, which is very useful for the design of a wide range of atmospheric pressure thermal plasmas devices and applications, such as: ICPTs with injection of powders for spheroidization purposes (showing the trajectory and heating history of powders injected in the torch through a carrier gas together with their effect on the plasma discharge for various geometric, electric and operating conditions by means of an improved turbulent version of a 3-D previously developed code where the helicoidal coil and the gas injection section of industrial plasma torches are taken into account without geometry simplifications), twin-torch DC transferred arc plasma systems for waste treatment (showing time-dependent effects arising in the fluid flow and temperature distribution of a plasma transferred electric arc discharge generated between two suspended metallic electrodes used inside a plasma furnace for hazardous waste incineration with turbulence effects taken into account using a RANS approach, as well as the effect on the discharge characteristics of using different types of plasma gas (air and Ar/H2 mixtures), for various geometric and operating conditions), DC non-transferred arc torch for plasma spraying (3-D time dependent model to simulate the behaviour of such a device without any external assumption on the anode restriking and attachment and to simulate also the downstream expansion of the plasma jet after the torch nozzle using a LES turbulence model).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, Pure and Applied Chemistry, 77, pp. 359 – 372, (2005).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, T.Trombetti, Czechoslovak Journal of Physics. 54, pp. C489 - C515 (2004).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, T. Trombetti, IEEE Transactions on Plasma Science, 33, pp. 424–425 (2005).
D. Bernardi, V. Colombo, E. Ghedini, A. Mentrelli, IEEE Transactions on Plasma Science, 33, pp. 426–427 (2005).
D. Bernardi, V. Colombo, E. Ghedini, S. Melini, A. Mentrelli, Three-dimensional time-dependent modelling of magnetically deflected transferred arc, IEEE Transaction On Plasma Science 33, 428-429 (2005).
V. Colombo, E. Ghedini, Time Dependent 3-D Simulation of a DC Non-Transferred Arc Plasma Torch: Anode Attachment and Downstream Region Effects, Proc. of the 17th Int. Symp. on Plasma Chemistry-ISPC17 (2005).
V. Colombo, E. Ghedini, A. Mentrelli, E. Malfa, 3-D Modelling of DC Transferred arc Twin Torch for Asbestos Inertization. In Nuclear Reactor Physics. A collection of papers dedicated to Silvio Edoardo Corno, Torino, C.L.U.T., pp. 169 - 196 (2005).
V. Colombo, E. Ghedini, Time-Dependent 3-D Modelling Of Dc Transferred Arc Twin Torch, High Technology Plasma Processes 9 - HTPP9, St. Petersburg (2006)
Modelling and Comparison of Different Design Solutions for DC Transferred Arc Plasma Cutting Torches
No full textModelling and Comparison of Different Design Solutions for DC Transferred Arc
Plasma Cutting Torches
V. Colombo, E. Ghedini
Department of Mechanical Engineering (D.I.E.M.) and Research Center for Applied Mathematics (C.I.R.A.M.)
Università di Bologna, Via Saragozza 8, 40123 Bologna, Italy
S. Dallavalle, M. Vancini,
Cebora S.p.A., Via Andrea Costa 24, 40057 Cadriano di Granarolo, Italy
The aim of this work is to investigate by means of a 2-D and 3-D FLUENT© based numerical model the behaviour of different types of transferred arc dual gas plasma torches used for cutting of metallic materials, putting into evidence the physical reasons for the industrial success of various design and process solutions appeared over the last years, such as: secondary gas swirl injections with different directions, various different approaches for the geometry of the plasma chamber, the effect of externally superimposed magnetic fields. Flow and heat transfer equations are solved with coupled electromagnetic ones, for a LTE optically thin plasma, while turbulence phenomena are taken into account by means of a k-ε RNG model. Simulations include a prediction of the thermal behaviour of the solid components of the torch head, including electrode and hafnium insert, thermal histories and trajectories of hafnium oxide particles emitted from it under idealized conditions and the efficiency of nozzle and electrode cooling systems in various operating conditions including gas mixtures (O2/air, H35/N2, N2/N2). Radiation is included in the calculation of heat transfer to the surfaces of the components using a customized Discrete Ordinate (DO) model. Results obtained from the simulations of one of the plasma torches here considered are also compared with experimental measurements in order to perform a validation of the model for what concerns pressure values in different regions of the device, and the gas mass flow rate during the working phase. For this purpose two suitably modified plasma torches with pressure and temperature measurement systems have been designed and used during realistic cutting conditions.
V. Colombo, E. Ghedini, S. Dallavalle, M. Vancini, 3-D Fluidynamic and Plasma Characterization of DC Transferred Arc Plasma Torches for Metal Cutting. 17th International Symposium on Plasma Chemistry (ISPC-17). Toronto, august 2005.
V. Colombo, E. Ghedini, G. Masini, D. Russo, S. Dallavalle, M. Vancini, 2-D And 3-D Fluidynamic And Plasma Characterization Of Dc Transferred Arc Plasma Torches For Metal Cutting, High Technology Plasma Processes 9 -HTPP9, St. Petersburg (2006); in press on Journal of High Temperature Material Processes
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