1,720,964 research outputs found
20dBm linearly polarised tunable single-frenquency diode-pumped Er:Yb laser at 1535nm using anisotropic absorptive intracavity etalon
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Amplitude and Frequency Stabilization of a Tm-Ho:YAG Laser for Coherent Lidar Applicatios at 2.1 um
No full textPubblicazione su invito (Invited Paper
Frequency stabilization to a molecular line of a diode-pumped Er-Yb laser at 1533-nm wavelength
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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
Resonators for Kerr-lens mode-locked femtosecond Ti:sapphire lasers
No full textResonators for Kerr-lens mode-locked lasers are studied with the help of an analytical model, and a new design procedure is presented. The experiments performed with a femtosecond Ti:sapphire laser demonstrate that this model permits an effective resonator design and offers reliable guidelines for the final experimental optimization. With a suitable resonator configuration, self-starting of the Kerr-lens mode-locking regime has been achieved. Kerr-lens mode-locking (KLM) is a powerful tech-nique for ultrashort-pulse generation from a variety of solid-state lasers." ~ This technique is based on the self-focusing effect in a resonator containing a material with Kerr nonlinearity that modifies the transverse mode and results in power-dependent loss or gain modulation. This modulation is provided either by a suitable intracavity aperture (hard-aperture KLM) or by the transverse gain profile of the active material (soft-aperture KLM). Hard-aperture KLM has the advantage of bein
Stabilizzazione Assoluta in Frequenza di Sorgente laser a Er-Yb su Righe di Assorbimentodi C2H2
No full textVariations 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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