1,721,080 research outputs found
Recensione a M. Baldacci, Prospettive per la scuola dell'infanzia
No full textA fronte dei crescenti rischi di mercificazione delle esperienze educative e dell’«indebolimento sociale e istituzionale della scuola d’infanzia» [p. 123], il libro di Baldacci appare salutare, per certi versi indispensabile. Si tratta di un testo schierato, militante, che, in specie nella parte finale, delinea traiettorie per il futuro valevoli quali antidoti a quelle istanze aziendalizzanti che tendono a trasformare la scuola dell’infanzia in un «incubatore di talenti da scoprire precocemente», facendone non uno «spazio di emancipazione» per il «pieno sviluppo» dei soggetti [p. 8], ma un sistema di fabbricazione di capitale umano nei cui confronti le famiglie si comportano come clienti. Il risultato è la rottura dell’alleanza pedagogica scuola-famiglia
Gramsci e la recensione a New Schools in the Old World
No full textQuesto saggio analizza un paragrafo dei Quaderni del carcere di Gramsci relativo a un commento del Sardo a una recensione di un volume di Washburne e Stearns nel quale sono raccontate alcune esperienze europee di scuole attive. Adottando una lettura diacronica e filologica e ragionando sulle fonti originali di cui Gramsci poteva disporre, lo scritto, inoltre, ricostruisce brevemente i modi in cui la letteratura pedagogica ha trattato questo testo gramsciano
Istruzione e produzione nei Quaderni del carcere
Full text linkIn questo scritto, sono interrogati alcuni paragrafi dei Quaderni del carcere di Gramsci relativi alla questione dell’istruzione, mostrandone i nessi con paragrafi dedicati all’industrialismo fordista e alle trasformazioni economico-produttive dei primi decenni del Novecento. Verrà, così, evidenziata la presenza, nei Quaderni, di un isomorfismo lessicale tra discorso sulla scuola e discorso sulla produzione e sulle mutazioni antropologiche consustanziali all’affermazione del fordismo. Per farlo, ci si soffermerà, tra le altre cose, sulla figura della scuola unica/unitaria per la prima volta evocata nel Quaderno 1 e poi approfondita nei Quaderni 4 e 12.In this essay, I will examine some paragraphs of Gramsci’s Prison Notebooks concerning school and education. In particular, I will show the connections between the paragraphs concerning the instruction and the paragraphs concerning fordism. So, I will highlight the presence, in the Prison Notebooks, of a lexical isomorphism between the pedagogical question and the question of the production, focusing on the unified school treated in the Notebooks 1, 4, 12
Il Concetto di istruzione nei Quaderni del carcere di Gramsci
No full textIl saggio ricostruisce il concetto di istruzione nei Quaderni del carcere
A liquid crystal photonic switch: preliminary results and new developments
No full textOral presentation at the SALC-NET annual plenary meeting (EU project number: BRRT-CT97-5003
Die Universität als Knowledge Factory. Zwischen New Public Management, Forschung als Zeitarbeit und Production prekären Humankapitals
No full textDipo avere analizzato criticamente le trasformazioni in chiave neomanageriale del sistema italiano di istruzione terziaria superiore, il saggio si sofferma sui movimenti universitari del biennio 2008-201
Guided wave optical switches using liquid crystals for high capacity communication systems
No full textWavelength division multiplexing (WDM) optical networks, able to operate at Tb/s data speed, to satisfy the continuous growth of the world wide web, require signal format transparent all-optical switches, routers, filters, add and drop multi/demultiplexers. A successful technology to make such devices must allow to get high performance and large integration scale at low fabrication costs.
A new class of materials to make photonic devices are liquid crystals (LC), mostly developed so far for flat panel display applications. The novel interest for LC photonic devices is mainly due to their high birefringence (0.1-0.2) and high electro-optic effect, which allows low driving voltages with relatively short switching times in the range of microseconds, as in the case of ferroelectric LC (FLC). Furthermore LC are characterized by refractive indices close to that of glass and silica used to make optical fibers and optical waveguides, therefore low LC-waveguide coupling losses can be expected. By presenting a couple of device examples we intend to demonstrate that liquid crystals can be effectively used to create a novel generation of low cost and high performing integrated optical devices.
Glass waveguides and LC can be combined to make integrated optic circuits to be employed both in sensor and telecommunication applications. The fabrication of integrated optic devices using LC and optical glass waveguides is not too much different from the well-established flat panel display fabrication process. Furthermore optical transparency of glass substrates allows to observe liquid crystal orientation.
We experimentally demonstrated an optical bistable switch using FLC and ion-exchanged glass optical waveguides. The switch, based on a vertical directional coupler made of an FLC layer embedded between two optical waveguides, showed losses less than 5 dB, short switching time of 270 μm and required low driving voltages of about 20 V to obtain extinction ratios over 15 dB, with a coupling length shorter than 4mm at wavelength of 632.8 nm [1]. A novel design by using diffused channel waveguides obtained by ion exchange operating at the wavelength of 1550 nm will be presented in which coplanar electrodes are used to switch liquid crystals to reduce losses due to light absorption. The optimized device configuration is characterized by a coupling length as short as 140 μm, losses below 0.5 dB and crosstalk, defined as ratio between optical power at the output ports, above 40 dB.
Low power and ultrashort optical switches can be obtained also by using a simple nematic liquid crystal layer as a voltage assisted optical waveguide switch. An applied voltage lower than just 1.5 V can provide lateral confinement of the signal, whereas its increase of about 119 mV can switch the light output between two different positions in a device length of just 230 μm. The investigated geometry allows the realization of a versatile and fully electro-optic Y-junction switch, which can be optimized for operation at any wavelength of interest by acting on the bias [2].
References
[1] A. d’Alessandro, R. Asquini, F. Menichella, C. Ciminelli, “Realisation and characterisation of a ferroelectric liquid crystal bistable optical switch”, Mol. Cryst. Liq. Cryst., vol 372, pp. 353-363, (2001).
[2] R. Asquini, A. d’Alessandro, G. Assanto, “Electro-optic guided-wave router using nematic liquid crystals”, Europ. Conf. on Integrated Optics ECIO 2003, vol. 1, pp. 249-52 (2003)
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
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