1,721,038 research outputs found
Solid state TiO2 photosensor for environment and food control
No full textin C. Di Natale, A. D'Amico (Ed.), Sensors and Microsystems, World Sci., Singapor
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
Direct-gap excitons in InSe by modulated magneto-optics and photoconductivity
No full textWe have studied the optical properties of InSe at 4.2 K with the light propagating along the c axis of the crystal near the fundamental direct gap. In the presence of a partially modulated magnetic field, we could resolve the n = 1, 2 and 3 lines of an exciton series. We deduce the direct gap energy Eg = 1.353 ± 0.001 eV and the exciton Rydberg R = 13.7 ± 1.5 meV. The existence of the series is confirmed by photoconduction measurements
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
Measurement of the third order nonlinear susceptibility of Ag nanoparticles in glass in a wide spectral range
No full textWe determined the third-order susceptibility [ χ (3)] of a thin composite film formed by silver nanoclusters embedded in soda-lime glass. Ag aggregation was promoted by irradiating an Ag-Na ion-exchanged glass with an N + beam. [ χ (3)] dispersion was measured by phase-mismatched degenerate four-wave mixing in the 380-470 nm spectral range, with 0.5 ps laser pulse duration. Close to the surface plasmon resonance of Ag metallic clusters, the χ (3) amplitude exceeds by a factor of 10 4 the value of substrate glass. We also measured a phase of 83° and a dynamics characterized by ∼ 30, 3 and 0.9 ps decay times, ascribed to hot-electrons-lattice thermalization in the clusters, followed by thermal diffusion toward the matrix and relaxation of the whole system to the starting temperature
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