1,721,040 research outputs found
Interferometric Michelson-type optical-fiber sensor: comparison between phase-modulation and frequency-modulation detection
No full textA new setup is presented that solves the isolation problem, optimizes the recovery of the light signal, and prevents any unwanted reflex in a Michelson scheme on an interferometric fiber sensor. Phase modulation (PM) and frequency modulation (FM) are both treated as the result of the fiber-optic-induced phase shift. The demodulation aspect involved in the FM detection is investigated especially in order to establish a direct link between the modulation index and the integral phase shift. A novel approach that permits the direct FM-index recovery is also reported. PM- and FM-demodulating processes are tested experimentally to detect the phase shift induced by a 20-Hz dynamical deformation on the fiber. The FM results are compared for small values of phase shift with the ones given by the PM scheme, whereas for large values of phase shifts, they are compared with others obtained directly from the spectral display. The measurements confirm the linear behavior of the fiber-strain sensor in the four decades of values, show the correctness of the analysis, and point out the possibility of using the fiber-strain sensor with engineering values of deformation
Julio A. Barberis, Los recursos naturales compartidos entre estados y El Derecho Internacional, 1979
No full textJulio A. Barberis, Los recursos naturales compartidos entre estados y El Derecho Internacional, 1979. In: Revue Juridique de l'Environnement, n°1, 1980. p. 92
Julio A. Barberis, Los recursos naturales compartidos entre estados y El Derecho Internacional, 1979
No full textJulio A. Barberis, Los recursos naturales compartidos entre estados y El Derecho Internacional, 1979. In: Revue Juridique de l'Environnement, n°1, 1980. p. 92
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
Los movimientos de liberación nacional en el pensamiento de Julio A. Barberis
No full textEl artículo reseña los aportes de Julio A. Barberis respecto de la subjetividad internacional de los movimientos de liberación nacional y analiza el estado de la cuestión a la luz de los desarrollos actuales del derecho internacional.The article reviews the contributions of Julio A. Barberis with respect to the international personality of the national liberation movements and analyzes the state of the issue in the light of the current developments of international law.Fil: Pezzano, Luciano. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina. Universidad Nacional de Córdoba. Facultad de Derecho y Ciencias Sociales. Centro de Investigaciones Juridícas y Sociales; Argentina. Academia Nacional de Derecho y Ciencias Sociales de Córdoba. Instituto de Derecho Internacional Público y de Derecho de la Integración; Argentina. Universidad de Ciencias Empresariales y Sociales de San Francisco; Argentin
Guided-wave rotating retarder
No full textA guided-wave rotating retarder has been developed. The device is based on the generation of a rotating elasto-optics effect by the contemporary application of three 120-degrees space-phased and time-phased forces. A first experiment made by using a GRIN lens is reported. A retarder with 1 radian of magnitude is obtained which can rotate 180 degrees. The magnitude and the rotation of the device axis are continuously adjustable. The device can be exploited also for fiber-optic components and it constitutes the basis for endless polarization compensators
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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