200,671 research outputs found
Recensione a Dalla parte di Swann, traduzione di M.-T. Nessi Somaini
No full textrecensione a: M. PROUST, Dalla parte di Swann, trad. di M.-T. Nessi Somaini, introduzione di C. Bo, premessa al testo di G. Bogliolo e P. Toffano, con un saggio su Proust e la critica italiana di G. Bogliolo, Milano, Rizzoli (B.U.R.), 1985, in «Studi di letteratura francese», XIII (1987, La letteratura fantastica), pp. 187-18
NESSi: The Non-Equilibrium Systems Simulation package
No full textThe nonequilibrium dynamics of correlated many-particle systems is of interest in connection with pump-probe experiments on molecular systems and solids, as well as theoretical investigations of transport properties and relaxation processes. Nonequilibrium Green’s functions are a powerful tool to study interaction effects in quantum many-particle systems out of equilibrium, and to extract physically relevant information for the interpretation of experiments. We present the open-source software package NESSi (The Non-Equilibrium Systems Simulation package) which allows to perform many-body dynamics simulations based on Green’s functions on the L-shaped Kadanoff-Baym contour. NESSi contains the library libcntr which implements tools for basic operations on these nonequilibrium Green’s functions, for constructing Feynman diagrams, and for the solution of integral and integro-differential equations involving contour Green’s functions. The library employs a discretization of the Kadanoff-Baym contour into time N points and a high-order implementation of integration routines. The total integrated error scales up to O(N^-7), which is important since the numerical effort increases at least cubically with the simulation time. A distributed-memory parallelization over reciprocal space allows large-scale simulations of lattice systems. We provide a collection of example programs ranging from dynamics in simple two-level systems to problems relevant in contemporary condensed matter physics, including Hubbard clusters and Hubbard or Holstein lattice models. The libcntr library is the basis of a follow-up software package for nonequilibrium dynamical mean-field theory calculations based on strong-coupling perturbative impurity solvers
Lo sviluppo dei nessi semantici in un compito di memoria di lavoro verbale con riconoscimento in bambini di seconda e quarta primaria
No full textL’obiettivo del presente lavoro è studiare come l’organizzazione della memoria semantica moduli la prestazione in un compito di memoria di lavoro (ML) che valuta il riconoscimento di parole.
Ad un gruppo di bambini a sviluppo tipico di seconda (età media 7,8 anni) e quarta (età media 9,5 anni) primaria è stato proposto un compito di ML creato al computer in cui si chiedeva di memorizzare e poi riconoscere parole associate con nessi di tipo categorizzante, associativo o arbitrario. Sono state considerate accuratezza e tempi di riposta (TR) al riconoscimento.
I risultati mostrano una facilitazione nel riconoscimento (maggiore accuratezza e minori TR) per parole che fanno parte di nessi categorizzanti. Gli effetti sono simili per gruppi d’età, ma più rilevanti nei bambini piccoli.
I risultati saranno discussi alla luce delle differenze evolutive e nell’ipotesi di un possibile periodo maggiormente critico/sensibile in cui la differenza tra i nessi semantici è più evidente
Nessi: An EEG-controlled web browser for severely paralyzed patients
No full textArt. 71863We have previously demonstrated that an EEG-controlled web browser based on self-regulation of slow cortical potentials (SCPs) enables severely paralyzed patients to browse the internet independently of any voluntary muscle control. However, this system had several shortcomings, among them that patients could only browse within a limited number of web pages and had to select links from an alphabetical list, causing problems if the link names were identical or if they were unknown to the user (as in graphical links). Here we describe a new EEG-controlled web browser, called Nessi, which overcomes these shortcomings. In Nessi, the open source browser, Mozilla, was extended by graphical in-place markers, whereby different brain responses correspond to different frame colors placed around selectable items, enabling the user to select any link on a web page. Besides links, other interactive elements are accessible to the user, such as e-mail and virtual keyboards, opening up a wide range of hypertext-based applications.200
NESSi: The Non-Equilibrium Systems Simulation package
No full textThe nonequilibrium dynamics of correlated many-particle systems is of interest in connection with pump-probe experiments on molecular systems and solids, as well as theoretical investigations of transport properties and relaxation processes. Nonequilibrium Green’s functions are a powerful tool to study interaction effects in quantum many-particle systems out of equilibrium, and to extract physically relevant information for the interpretation of experiments. We present the open-source software package NESSi (The Non-Equilibrium Systems Simulation package) which allows to perform many-body dynamics simulations based on Green’s functions on the L-shaped Kadanoff-Baym contour. NESSi contains the library libcntr which implements tools for basic operations on these nonequilibrium Green’s functions, for constructing Feynman diagrams, and for the solution of integral and integro-differential equations involving contour Green’s functions. The library employs a discretization of the Kadanoff-Baym contour into time N points and a high-order implementation of integration routines. The total integrated error scales up to O(N^-7), which is important since the numerical effort increases at least cubically with the simulation time. A distributed-memory parallelization over reciprocal space allows large-scale simulations of lattice systems. We provide a collection of example programs ranging from dynamics in simple two-level systems to problems relevant in contemporary condensed matter physics, including Hubbard clusters and Hubbard or Holstein lattice models. The libcntr library is the basis of a follow-up software package for nonequilibrium dynamical mean-field theory calculations based on strong-coupling perturbative impurity solvers
Packaging solutions for food waste prevention: a methodological framework for LCA modelling
No full textThe use of innovative or improved packaging solutions is increasingly recognized as an integral part of the solution to reduce food waste and its environmental impacts. However, an increase in the impacts of packaging, of the distribution chain and of the consumer stage may take place at the same time. The aim of this research is contributing to the definition of a LCA-based methodological framework to evaluate the environmental convenience of such packaging solutions, and identify potential trade-off situations. A number of methodological issues are addressed, by providing suggestions and possible supporting examples to facilitate proper choices. If available, alternative options are presented, and their implications discussed. The estimates of packaging-specific food waste generation rates was found to be challenging, and may currently prevent reliable results. Further research is thus recommended to fill this gap
L'ARCHITETTURA TRA L'ABITARE E IL PRODURRE
No full textIl tema de L'Architettura tra l'abitare e il produrre si propone come viaggio tra le dimores storiche dell'area montana della regione Lombardia, con l'intento di rendere comprensibile il complesso rapporto che lega storia, architettura, produzione e cultura
Compensated MOS string and DAC employing such a potentiometric string
No full textA digital-to-analog converter includes a potentiometric string suitable for realizing a relatively high number of bits that significantly reduces the silicon area requirement and simplifies mismatch compensation. The structure includes a first resistance string to realize a first DAC to convert a first number of most significative bits, and a second potentiometric string functionally connected in cascade to the first, but realized with MOS transistors. The structure of the invention allows the coupling of the two DACs in cascade by exploiting the MOS transistors that form the second potentiometric string, that is, the second DAC, thus avoiding the use of operational switches or amplifiers which may provide error sources. Moreover, the structure of the invention lends itself to the implementation of efficient compensation circuits for integral and differential linearity errors
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
Nucleon and composite particle production in spallation reactions studied with the multi purpose detector NESSI
No full textNESSI, a 4pi detector for neutrons and charged particles, was used in studies of proton induced spallation reactions at the COSY facility. Due to the high detection efficiency of NESSI for particles evaporated from excited nuclei, measured particle multiplicities provide event by event information on the nuclear excitation energy. Data obtained for proton induced reactions on thin targets ranging from Al to U and proton energies from 0.8 to 2.5 GeV are compared with model predictions
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