1,721,280 research outputs found
RANCIÈRE, Jacques. O espectador emancipado. 1ª edição. Trad. Ivone C. Benedetti. São Paulo: WMF Martins Fontes, 2012
No full textResenha do livro:RANCIÈRE, Jacques. O espectador emancipado. 1ª edição. Trad. Ivone C. Benedetti. São Paulo: WMF Martins Fontes, 2012
Effective dephasing for a qubit interacting with a transverse classical field
No full textWe address the dynamics of a qubit interacting with a quasi static random classical field having both a longitudinal and a transverse component and described by a Gaussian stochastic process. In particular, we analyze in detail the conditions under which the dynamics may be effectively approximated by a unitary operation or a pure dephasing without relaxation
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
Characterization of classical Gaussian processes using quantum probes
Full text linkWe address the use of a single qubit as a quantum probe to characterize the properties of classical noise. In particular, we focus on the characterization of classical noise arising from the interaction with a stochastic field described by Gaussian processes. The tools of quantum estimation theory allow us to find the optimal state preparation for the probe, the optimal interaction time with the external noise, and the optimal measurement to effectively extract information on the noise parameter. We also perform a set of simulated experiments to assess the performances of maximum likelihood estimator, showing that the asymptotic regime, where the estimator is unbiased and efficient, is approximately achieved already after few thousands repeated measurements on the probe system
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
A new approach to energetic requalification of existing buildings
No full textA good knowledge of technical features of existing building resources is necessary to improve their energetic performances. For this purpose the research analyses building systems and technologies and it identifies energetic problems and performances, proposing a critic evaluation of the possibilities of the intervention.
The research pays a special attention on moisture and condensation problems which can occur as a consequence of retrofitting interventions.
The impact of the planning decisions on moisture content and behaviour of the existing components with respect to building physics have to be taken into consideration when there are attempts to upgrade the building’s thermal performance of existing building to save energy.
The verification of moisture transfer is generally conducted using the standardised steady-state Glaser method. This standard calculation, considering only vapour diffusion transfer, fails to produce realistic results when handling with an interior thermal insulation because overestimates the possibility of condensation at the former inner surface of the wall and doesn’t consider the moisture storage potential of the component.
In this research an innovative simulation method is used; it is developed to perform more realistic and detailed simulation of the hygrothermal behaviour based on EN 15026:2008. The method allows to evaluate the real potential of interior thermal insulation on existing building components under natural conditions
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