1,721,087 research outputs found
Cochlear implant modelling: stimulation and power consumption
No full textCochlear implants have been shown to successfully restore hearing to the profoundly deaf. Despite this achievement, issues remain concerning the power consumption and the accuracy of stimulation. This thesis is mainly concerned with investigating the spread of stimulation voltage within the cochlea. The power required to generate the stimulus is also investigated, as is the feasibility of powering a fully implanted cochlear implant by harvesting energy from head motion.Several different models have been used to study the voltage distribution within the cochlea due to electrical stimulation from individual electrodes of a cochlear implant. A resistive cable model is first used to illustrate the fall-off of the voltage with distance at the electrode positions along the cochlea. A three-dimensional finite element model of the cochlea is then developed to obtain the voltage distribution at positions closer to the site of neural stimulation. This model is used to demonstrate the way that the voltage distribution varies with the geometry of the cochlea and the electrode array. It was found that placing the return electrode of the implant within the modiolus, as opposed to outside the cochlea, resulted in higher stimulation for the same current input, which reduces the power requirements. The model has also been used to investigate the consequences of a current-steering, or stimulation focussing, strategy that has previously been proposed. A generalisation of this strategy is suggested, whereby impedance information at the neural level, along the path of the spiral ganglion, was used to optimise the focussed voltage distribution at the target neurons.The power consumption of various stimulation strategies is then estimated in order to assess their energy efficiency. Strategies are defined by parameters such as stimulation rate and number of active channels. The feasibility has also been investigated of harvesting electrical energy from head motion, to power a fully-implanted cochlear implant. It was demonstrated that more power could be harvested from higher harmonics but that this would be sensitive to walking speed. The practical approach is to have a heavily damped device that is insensitive
Participatory, collaborative and integrated schemes in training process and skill transfer
No full textThis paper illustrates a local research project aimed to find a cognitive basis, formalised through a shared
language and made of existing implicit and/or encoded knowledge on cross-compliance, and to develop an
integrated, joint communication action, capable of strengthening the local relational networks.
This project was built around the following principles:
• Participation: by sharing and exchanging information and knowledge in a joint learning;
• Cooperation: by individual skills outing within a framework of activities and actions;
• Promotion of knowledge: through the full promotion of expertises of varying extents and contents,
resulting from corporate practices, within-farm extension and the research world.
The project involves creating a local agro-environmental platform, capable of binding together, through a
participatory work, the field practice, the interests of the different stakeholders in the primary sector, and the
local research facilities dealing with cross-compliance
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
Ricerca geografica sul mirto
No full textLa presente ricerca sul mirto (Myrtus communis L.) ha come obiettivo un'indagine
comparativa tra una serie di fattori geografico-fisici e la distribuzione
della pianta nell'isola.
Pertanto, si prescinde come impostazione da letture e interpretazioni diverse
da quella geografico-fisica ed in particolare, com'è ovvio, da valutazioni di
carattere strettamente biologico-floristico. Pertanto, saranno presi in considerazione i fattori più importanti che influenzano
di norma la distribuzione geografica delle aree vegetazionali dell'isola,
tra cui le condizioni climatiche (temperatura dell'aria, umidità atmosferica e
regime dei venti) e l'ambiente geolitologico e geomorfologico. Al fine di verificare le premesse metodologiche del presente lavoro sono stati effettuati alcuni sovralluoghi e proposti alcuni itinerari
Attività agro-zootecniche nella Tenuta di S. Rossore. Innovazione radicale e progettazione partecipata
No full textL'articolo presenta gli esiti di un processo partecipato di progettazione propedeutico alla realizzazione di un'attività zootecnica multifunzionale e a bassa impatto ambientale in un'area protetta dal punto di vista naturalistic
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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