1,720,969 research outputs found
Fingertip scanning on a surface: friction coefficients and induced vibrations
No full textTactile perception happens when scanning the fingertip on object surfaces (haptic sensing), by activating the receptors that are located in the skin. The skin deformation due to the contact stresses and the vibrations induced by the sliding contact activate the mechanoreceptors which generate electric impulses and allow the brain to identify objects and perceive information about their surfaces.
In this paper, the friction coefficient between a real human finger and both rigid surfaces and fabrics is recovered, as a function of the contact parameters (load and scanning speed). Then, the analysis of the vibration spectra is carried out to investigate the characteristics of the induced vibrations, measured on the fingernail, as a function of surface features and contact parameters.
Different behaviour of the friction coefficient is recovered scanning rigid surfaces or textiles, with respect to the contact parameters.
Results show that frequency spectrum distribution when touching a rigid surface is mainly determinate by the relative geometry of the two contact surfaces, while, when scanning a fabric, the structure and the deformation of the textile itself affect largely the spectrum of the induced vibration. Some main characteristics of the measured vibrations are found to be representative of tactile perception, by comparison with psychophysical and neurophysiologic works in literature
Numerical and Experimental Characterization of Compliant Joints in Micro-Manipulators with parallel Architecture
No full textIn this paper a study on compliant parallel micromanipulators is presented. In particular, the elastic joints are firstly characterized through both an analytical and numerical treatment, the latter based on FEA. This allows to evaluate the influence of the joint geometry on the main parameters of the joint compliances, more frequently adopted in the applications. Finally, an experimental campaign is conducted on a sample prototype with the purpose of inquiring about the actual feasibility of a manipulator that embeds one or more types of the analyzed joints
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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