959 resultados para emissione spontanea,emissione stimolata,schema a quattro livelli,atomi,fotoni,Olografia


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Mode of access: Internet.

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Includes bibliographical footnotes and index.

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Against Felice Romani, a critic of Grossi's I Lombardi alla prima crociata.

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Each volume has individual title-page. Title taken from general half-title.

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The life of Guarino is contained in libri 1.-3. (v. 1-2); biographical sketches of thirty-one of his "disciples" in libro 4. (v. 3)

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Contiene: Tomo primo. - Tomo secondo della prima parte. - Tomo terzo parte seconda. - Tomo quarto parte terza.

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Reprint of the 1865 ed. published by G. Daelli, Milan, which was issued as v. 63 of Biblioteca rara.

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Text by A. Colautti, after the play by E. Scribe and E. Legouvé. Cf. Loewenberg. Annals of opera.

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No more published.

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Geospatio-temporal conceptual models provide a mechanism to explicitly represent geospatial and temporal aspects of applications. Such models, which focus on both what and when/where, need to be more expressive than conventional conceptual models (e.g., the ER model), which primarily focus on what is important for a given application. In this study, we view conceptual schema comprehension of geospatio-temporal data semantics in terms of matching the external problem representation (that is, the conceptual schema) to the problem-solving task (that is, syntactic and semantic comprehension tasks), an argument based on the theory of cognitive fit. Our theory suggests that an external problem representation that matches the problem solver's internal task representation will enhance performance, for example, in comprehending such schemas. To assess performance on geospatio-temporal schema comprehension tasks, we conducted a laboratory experiment using two semantically identical conceptual schemas, one of which mapped closely to the internal task representation while the other did not. As expected, we found that the geospatio-temporal conceptual schema that corresponded to the internal representation of the task enhanced the accuracy of schema comprehension; comprehension time was equivalent for both. Cognitive fit between the internal representation of the task and conceptual schemas with geospatio-temporal annotations was, therefore, manifested in accuracy of schema comprehension and not in time for problem solution. Our findings suggest that the annotated schemas facilitate understanding of data semantics represented on the schema.