1,721,242 research outputs found
Statistical analysis of Stromboli VLP tremor in the band (0.1-0.5) Hz: Some consequences for geometrical vibrating structure.
No full textAnalysis of acoustic field emitted by organs: A contribution for the tuning of ancient instruments
No full textThis work is devoted to the study of the acoustic field produced by flue organ pipes. Several experiments have been performed in order to investigate the characteristics of the acoustic wavefield with the aim to provide an objective method for the restoration and tuning of organs. We study the behaviour of the pipes when they are excited by different levels of blowing pressure and when a single pipe is played in presence of another even silent. Synchronization and shifts in frequency occur
Self-sustained oscillator as a model for explosion quakes at Stromboli Volcano
Full text linkWe analyze seismic signals produced by
explosion-quakes at Stromboli Volcano. We use standard
nonlinear procedures to search a low-order effective dynam-
ics. The dimension of the reconstructed phase space depends
on the number of samples. Namely larger time lengths cor-
respond to dynamical systems of different complexity. If we
restrict the analysis to the signal associated directly to the
source (Chouet et al., 1997), we obtain a phase space dimen-
sion equal to two. We reproduce this part of the signal with a
simple single self-sustained oscillator
Tidal synchronization of Long Period (LP) events and hydrothermal tremor at Campi Flegrei (Italy)
No full text
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
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