1,721,361 research outputs found
Cimeli alfieriani e altre curiosità
No full textV. Colombo descrive alcuni cimeli alfieriani costituiti da volumi appartenuti al poeta, manoscritti, edizioni a stampa con dediche e postille
Un carteggio inedito e altre lettere di Luisa Stolberg contessa d'Albany
No full textV. Colombo descrive e studia un carteggio inedito di Luisa Stolberg, compagna di Vittorio Alfieri, e alcune altre sue lettere inedite
High Technology Plasma Processes - Biennial Conference on Thermal Plasmas
No full textV. Colombo è stato nominato a luglio 2008 membro dello Steering Committee e dell'International Scientific Committee della conferenza High Technology Plasma Processes - Biennial Conference on Thermal Plasmas ed organizattore della medesima per l'anno 2012 a Bologna. La conferenza avra' la sua unidicesima edizione a Brussels nel luglio 2010.
http://www.plasmatech.gr/http
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)
«Elenco dei libri lasciati in Parigi». nuove interpretazioni di un manoscritto di Vittorio Alfieri
No full textV. Colombo si interroga sul manoscritto alfieriano VII-5-1 della Biblioteca della Fondazione 'Centro Studi Alferiani' di Asti, meglio noto come "Elenco dei Libri lasciati a Parigi" dal poeta e tragediografo a seguito della frettolosa partenza dalla capitale francese per i fatti rivoluzionari e per l'incombente pericolo di arresto della Stolberg. Analizzando minuziosamente il manoscritto, lo studioso dimostra che esso fu redatto in due fasi: prima a Parigi, all'atto di incassare i libri; poi a Firenze, tra il 1793 e il 1794, al momento dell'inventariazione dei volumi portati in salvo. Il saggio presenta in Appendice la trascrizione del manoscritt
Le lesioni del nervo linguale in chirurgia orale
No full textPREMESSA: la lesione del nervo linguale (LN) è una delle più comuni complicanze nell’ambito della chirurgia orale e determina deficit funzionali debilitanti per il paziente che ne è affetto. Nella maggior parte dei casi ne consegue l’ipoanestesia dell’emilingua omolaterale; in altri sintomatologia algica che può portare allo sviluppo di una sindrome depressiva reattiva.
INTERVENTO: l’indicazione terapeutica è l’indirizzo del paziente al microchirurgo per l’eventuale confezionamento della neurorrafia dei monconi nervosi lesionati. L’intervento, pur non restituendo completamente la sensibilità, implementa la funzionalità nervosa ed è tanto più vantaggioso quanto più precocemente viene impostato.
CONCLUSIONI: nel caso in cui la lesione sia insorta da più di 24 mesi o abbia causato algia cronica, l’alternativa è il ricorso alla terapia farmacologica e al supporto psicologic
Elucidation of the structure of the century old Ponzio and Gastaldi (P&G) compound
No full textIn 1913, by treating a solution of aminoguanidinium chloride with a stoichiometric amount of potassium hydroxide, and leaving the solution to slowly evaporate, a reddish violet, basic compound was obtained by Ponzio and Gastaldi (P&G) and attributed to the structure of the 3,6-diamino-1,2,4,5-tetrazine.1 Later on, in 1954, Chao Han Lin et al.2 disproved this attribution, through the unequivocal synthesis of the latter.
Presently, a century from its discovery, we report the elucidation of the structure of 1,1,4,10,10-pentaamino-2,3,5,6,8,9-hexaazadecan-1,3,5,7,9-pentaene, the P&G compound. Chemical and spectral studies have been done in order to advance a reasonable hypothesis for its formulation, whereas the structure has been determined by ab-initio X-ray powder diffraction analysis (XRPD). Moreover, in order to add, otherwise missing, information to our ab-initio XRPD structure determination, we have performed a lattice-constrained PBC-DFT optimization of our structural model.
In this contribution, our results on the elucidation of the still-missing structure of the P&G compound will be presented
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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