1,720,966 research outputs found
Diffusion study of 15N implanted into α-Ti using the nuclear resonance technique
No full textThe diffusion of 15 N in a-Ti was studied in the 673-1023 K temperature range by using ion implantation and nuclear resonance techniques. The measurements show that the diffusion coefficients follow an Arrhenius behaviour D(T) = D0 exp (-Q/RT) where D0 = (1.1 ± 0.8) x 10-7 m2 s-1 and Q = (183 ± 2) kJ/mol. A comparison with previous results is also given.Fil: Bregolin, F. L.. Universidade Federal do Rio Grande do Sul; BrasilFil: Behar, M.. Universidade Federal do Rio Grande do Sul; BrasilFil: Dyment, Fanny. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Improved set-up for the ytterbium optical clock at INRIM
No full textWe present an upgraded setup for cooling and trapping of ytterbium atoms in a optical clock experiment. The experiment aims to cool and trap ytterbium atoms in a two stage magneto-optical trap (MOT) (at 399nm and 556nm for the first and second stage, respectively) and to probe the narrow-line clock transition at 578 nm in an optical lattice at the magic wavelength (759 nm). We describe here the generation of all the laser sources and the design of a new physic package, including the vacuum chamber and the atomic source
Diffusion study of nitrogen implanted into α-Hf using the nuclear resonance technique
No full textThe diffusion of nitrogen in a-Hf was studied in the temperature range of (823-1123)K using the ion implantation and nuclear resonance techniques. The measurements show that the diffusion coefficients follow an Arrhenius behaviour D (T) = D0 exp (-Q / RT) with D0 = (5.5 ± 2.0) ×10-7 m2s-1 and Q = (228 ±1) kJ/mol. A comparison of the present results with the previous one is made. The difference between them can be attributed to the different purity of the samples used in each experiment.Fil: Bregolin, F. L.. Universidade Federal do Rio Grande do Sul; BrasilFil: Behar, Andrea Marcela. Universidade Federal do Rio Grande do Sul; BrasilFil: Dyment, Fanny. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Improved Set-Up for the Ytterbium Optical Clock at INRIM
No full textWe present an upgraded setup for cooling and
trapping of ytterbium atoms in a optical clock experiment. The
experiment aims to cool and trap ytterbium atoms in a two stage
magneto-optical trap (MOT) (at 399 nm and 556 nm for the first
and second stage, respectively) and to probe the narrow-line clock
transition at 578 nm in an optical lattice at the magic wavelength
(759 nm). We describe here the generation of all the laser sources
and the design of a new physic package, including the vacuum
chamber and the atomic sourc
External RBS analysis setup at University of Göttingen: RBS analysis for liquid samples
No full textIn this work, we describe new developments in the external analysis setup at University of Göttingen. The aim of this work is to expand the ability of the setup for performing Rutherford backscattering spectrometry (RBS) in atmospheric condition. This work presents the detail of the developed device for external RBS, as well as the initial result of RBS analysis for a volatile liquid sample. We also made an electrochemical cell with a Si 3 N 4 window designed for external RBS analysis. By using this setup, we have successfully acquired the change of composition around an electrode/liquid electrolyte interface. Since RBS can give us quantitative depth information, the external RBS developed here will open a way to characterize a solid‐liquid interface quantitatively and understand the chemical reaction of the interface
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
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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