1,721,228 research outputs found
Does co-location accelerate knowledge outflows from FDI? The role of MNC subsidiaries' technology sourcing strategies
No full textFraming space in Aztec writing : the Codex Mendoza as a model of transposition and beyond = Configurare lo spazio nella scrittura azteca : il Codice Mendoza come modello di trasposizione e oltre
No full textL’articolo affronta la comparsa di strutture testuali complesse ottenute attraverso l’uso di disposizioni spaziali, non sequenziali e multistrato di unità grafiche pittografiche nella scrittura
azteca. L’analisi di sistemi di scrittura non–trascrittivi e non–glottici può essere un campo di
ricerca interessante per i progettisti che cercano soluzioni notazionali in grado di “trasporre”
(nel senso di JAKOBSON 1959) contenuti in forme visive compatte, linguisticamente coerenti
anche se articolati in uno spazio non lineare. Lo studio delle pittografie azteche, infatti, fornisce
una solida base per ripensare la scrittura e la tipografia secondo un approccio non incentrato
sul pregiudizio alfabetico. Possiamo meglio illustrare questo argomento da due punti di vista: la
composizione di singoli “glifi” aztechi come “assemblaggi” non lineari e agglutinati di unità visive con una disposizione interna (entassi); la costruzione di strutture testuali più ampie attraverso
l’uso convenzionale e semantico di una disposizione non sequenziale e spaziale di unità articolate
(sinsemia). Dopo aver fornito un’analisi di esempi significativi del Codex Mendoza (f. 60r, f. 61r,
f. 2r e f. 4v), li confronteremo con testi europei come il Fasciculus Temporum di Rolewinck e la
Summa de virtutibus et vitiis di Perault. La nostra attenzione sarà appuntata sulle combinazioni
grafiche di unità nello spazio che “compongono” alcuni glifi aztechi e altre strutture sinsemiche,
ma anche sulla relazione tra notazione non lineare e testi lineari alfabetici (cioè glosse spagnole e
nahuatl per il Codex Mendoza, testi latini insieme a cornici emblematiche pittoriche per gli altri).
Tutti questi sono esempi efficaci e prodotti intenzionalmente di ciò che chiamiamo “scrivere senza trascrivere" parole (e frasi)
Modelling DC characteristics of GaAs MESFETs in a wide range of temperatures
No full textIn this paper, a new semiempirical DC thermal model of low- and high-power GaAs MESFETs is proposed. The model takes into account the effect of device negative output conductance and simulates external thermal effects modelling the dependence on temperature of the device threshold voltage and the maximum saturation drain-source current. A number of GaAs MESFETs, very different from a geometrical and technological point of view, have been characterized as a function of temperature and modelled by our model with high accuracy. The CPU extraction time results are moderate in any example. Results have been compared with the Rodriguez-Tellez model, showing improvements of accuracy better than 30 per cent. The model can be successfully used n MMIC CAD application
Collegamento di teleinformatica tra microcalcolatori e centro di calcolo esterno nel progetto di sistema ottici di telecomunicazioni
No full textAmplificatori M. I. C. implicanti transistori ad arseniuro di gallio
No full textThe design criteria for broad-band MESFET microwave amplifiers, that is to say the equivalent circuit of the GaAs transistors used, the matching networks and the microstrip dispersion on alumina substrates, are examined. It is found that the unilateral equivalent circuit of the MESFET is valid up to 12 GHz and the same bandwidth is confirmed by noise parameters. The amplifier design is examined, solving the matching problems with lumped networks instead of distributed networks. Nevertheless, for high values of inductance or capacitance, distributed parameter networks must be employed. Therefore, the microstrip dispersion on alumina substrates is investigated, proposing a linear relation between the effective dielectric constant and the frequency. As an example, a two-stage amplifier with three matching networks in the band 8 divided by 12 GHz, obtaining a gain near 15 db and an input and output VSWR less than 2, is analyze
Design and Modelling of Photonic Band-Gap Resonance Cavity
No full textAn optimal design of Photonic Band-Gap (PBG) based resonance cavities has been carried out and
optimal design rules have been drawn by a very fast and accurate computer code, developed by the authors,
implementing a new model of one-dimensional finite-size PBG materials. The model also takes into account the
presence of defects; it allows to accurately determine the mode propagation constants, electromagnetic harmonics
and total field distribution, transmission and reflection coefficients, forward and backward power flow, guided and
radiated power and total losses due to radiation, Bragg scattering and out of plane scattering. The design of resonance
cavities advancing the state of the art of commercial Dense Wavelength Division Multiplexing (DWDM) filters is
performed. A great number of optical cavities have been designed and quickly simulated thanks to the fastness of
the code, allowing optimal design rules to be drawn
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
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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