187,227 research outputs found
Carmen : strofe del toreador / [Bizet], comp ; A. Magini-Coletti, BAR [acc p] ; Coristi della Scala. Lakmè. Lakmè, quel ciglio a me si vela / [Delibes], comp. ; A. Magini-Coletti, BAR [acc p]
No full textTitre uniforme : [Carmen. GB 9]. Extrait ; arr. (italien)Titre uniforme : Delibes, Léo (1836-1891). Compositeur. [Lakmé]. Extrait ; arr. (italien)Comprend : Carmen / [Bizet], comp ; A. Magini-Coletti, BAR [acc p] ; Coristi della Scala ; Lakmè / [Delibes], comp. ; A. Magini-Coletti, BAR [acc p]Contient une table des matière
Correction: A Tale of Two Datasets: Representativeness and Generalisability of Inference for Samples of Networks
No full textThis note provides correction to some numerical results in Krivitsky P. N., Coletti, P., and Hens, N. (2023), "A Tale of Two Datasets: Representativeness and Generalisability of Inference for Samples of Networks," Journal of the American Statistical Association, 118, 2213-2224
Hollow cathode life time modelling
No full textHollow Cathodes (HCs) are of primary importance in the field of electric space propulsion, being used as electron sources in ion and Hall-effect thrusters. Hence, their lifetime is a key factor in all these applications.HCs have demonstrated the capability of providing up to 30,000 hours of operation, whereas no direct experimental data exist above this limit.The importance of HC lifetime is a growing issue for deep space missions usingpropulsive systems based on ion or Hall-effect thrusters that may require longerlifetimes than those demonstrated up to now. To address these concerns about HCs andto prove the suitability of an ion thrusters based solar electric propulsion subsystem forfuture high-impulse missions (such as Bepi Colombo), a model able to predict the HClifetime is needed.The model that has been developed in this thesis consists of three parts: a barium oxidedepletion model, a low work function surface coverage model and a plasma updateprocedure to calculate the effects that a change in the insert surface work function willproduce on the cathode plasma.The barium-oxide depletion model has been validated by comparing its results withexperimental measurements performed at QinetiQ and NASA, showing a goodquantitative agreement.The low-work function surface coverage model is the first of its kind to include theeffect of ion bombardment. The plasma update procedure, even if semi-empirical, isable to produce results that are in good agreement with the measurements.Using these three models the lifetime of the NSTAR hollow cathode has beensimulated, yielding predictions that are in good agreement with the theoreticalexpectations
Hemodynamics in a giant intracranial aneurysm characterized by in vitro 4D flow MRI
No full textThe attached file "giant_ane_velocity_pressure_public_release.tar.gz" contains the processed data for the associated paper.Experimental and computational data suggest that hemodynamics play a critical role in the development, growth, and rupture of cerebral aneurysms. The flow structure, especially in aneurysms with a large sac, is highly complex and three-dimensional. Therefore, volumetric and time-resolved measurements of the flow properties are crucial to fully characterize the hemodynamics. In this study, phase-contrast Magnetic Resonance Imaging is used to assess the fluid dynamics inside a 3D-printed replica of a giant intracranial aneurysm, whose hemodynamics was previously simulated by multiple research groups. The physiological inflow waveform is imposed in a flow circuit with realistic cardiovascular impedance. Measurements are acquired with sub-millimeter spatial resolution for 16 time steps over a cardiac cycle, allowing for the detailed reconstruction of the flow evolution. Moreover, the three-dimensional and time-resolved pressure distribution is calculated from the velocity field by integrating the fluid dynamics equations, and is validated against differential pressure measurements using precision transducers. The flow structure is characterized by vortical motions that persist within the aneurysm sac for most of the cardiac cycle. All the main flow statistics including velocity, vorticity, pressure, and wall shear stress suggest that the flow pattern is dictated by the aneurysm morphology and is largely independent of the pulsatility of the inflow, at least for the flow regimes investigated here. Comparisons are carried out with previous computational simulations that used the same geometry and inflow conditions, both in terms of cycle-averaged and systolic quantities.Winston and Maxine Wallin Neuroscience Discovery FundAmili, Omid; Schiavazzi, Daniele; Moen, Sean; Jagadeesan, Bharathi; Van de Moortele, Pierre-François; Coletti, Filippo. (2017). Hemodynamics in a giant intracranial aneurysm characterized by in vitro 4D flow MRI. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D6WX0S
A chemical model for barium oxide depletion from hollow cathode’s insert
No full textIn this paper a chemical model to predict barium oxide depletion from hollow cathode insert is developed. This model is based on the knowledge of the ternary diagram that exists in the BaO-CaO-Al2O3 system. This model takes also into account the diffusive motion of barium oxide inside the insert. A comparison between numerical and experimental data is made to determine the diffusion coefficient inside the insert. The diffusion coefficient presents an Arrhenius trend with activation energy similar to the one of barium oxide evaporation. A two dimensional model is used to demonstrate how temperature profile along the insert is a key parameter to calculate barium depletion
Hollow cathode chemical modelling
No full textIn this paper the state of hollow cathode life time modelling at the University of Southampton will be reported. Two models have been developed: one for BaO depletion from the hollow cathode insert and another for low work function compounds deposition and desorption. The model developed to predict BaO depletion from hollow cathode insert will be presented together with some comparison between experimental and numerical data to prove its validity.A model for low work function compounds deposition and desorption will also be presented. This model will be used to simulate the NSTAR cathode showing a very conservative estimate of the cathode life due to conservative character of the hypotheses made in the model development and due to the chosen criteria for the end of life
Prefazione alla nuova edizione
No full textNuova edizione rivista e aggiornata del Dizionario persiano-italiano di Alessandro Coletti e Hanne Coletti Grunbaum, la cui prima edizione risale al 1978. Il lavoro di revisione e aggiornamento, condotto con la collaborazione di Melissa Fedi e Federica Ponzo, ha comportato l'ammodernamento dell'ortografia dei lemmi e degli esempi in persiano; la revisione della trascrizione in direzione fonologica; la revisione di una buona parte del materiale lessicale originale, con distinzione delle accezioni moderne o colloquiali dai significati arcaici o obsoleti; la riduzione dell'aspetto 'enciclopedico' del dizionario in favore di un ampliamento del materiale lessicale; l'aggiunta di un gran numero di neologismi e di termini tecnici o relativi ad ambiti lessicali legati a nuove realtà (dalla tecnologia all'informatica, al lessico politico, ecc)
Numerical simulation of the insert chemistry of the hollow cathode from the deep space 1 ion engine 30,000 Hrs life test
No full textA model for the insert chemistry developed by the authors and based on the knowledge of the BaO – CaO – Al2O3 ternary system the ELT discharge cathode insert from the Deep Space 1 life test has been simulated. The computed data show a good agreement with the experimental one; the agreement increase with the imposition of boundary conditions closer to the experimental evidence. Tungsten deposition effect have been introduced into the model using experimental data and further improving the agreement between computed and measured data. The deposition trend found suggests the possibility of a link between barium depletion and tungsten deposition
Relaunching labour-market integration for migrants: What can we learn from successful local experiences?
No full textLabour policy can be considered the most crucial means with which to promote the effective integration of migrants. In this policy field, best practices circulate widely among policymakers, above all at the local level, to devise solutions to facilitate the integration of migrants. However, best practices tend to fail when they are transferred to other countries. In the light of the policy analysis literature on the transfer of best practices, the paper discusses three cases of local practices. It describes the network of actors, and it focuses on the reasons for the success of labour-integration policies for migrants during the implementation phase at the local level. The paper tests the following dimensions: the centrality of the users/migrants; the complexity and density of the networks of actors; and the mechanisms triggered. The hypothesis is that the activation of social mechanisms within an actors' network can achieve a higher level of migrant integration in countries affected by strong migratory flows, and direct more attention to the needs of end-users and their relationship with stakeholders at the local level. The paper analyses the case studies in order to detect the mechanisms that may positively affect implementation of labour policy. Moreover, it is important to determine whether local actors can play a positive role in increasing the effectiveness of migrants' integration into the labour market. An empirical analysis of the three cases is needed to identify the main success factors and to highlight the main findings of the empirical research
Mass Customization: An Exploration of European Characteristics
No full textMass Customization excites both Researchers and Practitioners because of the possibility to produce customized products with mass production efficiency. Mass Customization - An Exploration of European Characteristics gives an overview on the need for personalisation from a customer perspective, analyses Mass Customization theories and assesses relevant best practices of European and International markets. The results of a survey among more than 500 European customers show a declining willingness of customers to compromise on the issue of suitability of products to their personal needs and preferences, the possibility for companies to break brand loyalty and the influence of immediate availability, delivery time and price to the customer's willingness to take part in the co-creation process. Mass Customization has become important to business because of the difficulties of customers to find what they want despite an increase in product variety for many products over the past decades. The emergence of modern technologies in production and communication, however, allows companies to produce customized products without relinquishing economies of scale. With only few companies having taken this promising path, the authors believe that Mass Customization and Mass Customization related marketing strategies will play an essential role in the future and prompt both market leaders and their competitors to offer customization on a large scale for a vast variety of products
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