1,721,045 research outputs found
Design of a Marine Wireless Sensor Network for Seawater Quality Monitoring
Full text linkIn questa tesi viene presentata una profonda analisi di tutti i blocchi costituenti una versatile rete marina di sensori (WSN). Il framework discusso, incentrato sull’utilizzo di boe sensore per il monitoraggio in tempo reale della qualità dell’acqua marina, è stato pensato come estensione delle classiche sonde CTD, usate per la misura della conducibilità, della temperatura e della profondità dell’acqua marina. Queste vengono poi tipicamente equipaggiate con strumentazione addizionale per la misura della concentrazione di clorofilla-a e torbidità dell’acqua. Tuttavia questa strumentazione addizionale è di solito molto costosa e perciò ha di fatto impedito la realizzazione di un’ampia rete di unità di misura. A patire perciò da questa considerazione e tenendo presente le normative italiane in questo ambito, l’autore propone un nuovo ed economico modulo elettronico per il rilevamento in-vivo della clorofilla-a microalgale.
L’implementazione di tale sensore ha richiesto inoltre l’implementazione di una innovativa tecnica di progettazione di circuiti integrati, usata per derivare una completa rappresentazione simbolica del circuito e successivamente per simulare milioni di combinazioni dei parametri circuitali in un tempo esiguo. Il calcolo di una adeguata figura di merito permette quindi di selezionare la più appropriata combinazione di componenti passivi.
L’autore presenta inoltre due innovative tecniche prodotte: la prima per la caratterizzazione dei consumi energetici dei moduli di una WSN, tipicamente soggetti ad elevate variazioni dinamiche di corrente, e la seconda per una completa caratterizzazione dei moduli termoelettrici usati per fornire autonomia energetica, in cogenerazione con i pannelli solari, alle boe.A solid investigation of all the building blocks of a versatile Wireless Sensor Network for seawater monitoring applications is presented in this thesis.
The discussed framework, based on buoys for real-time monitoring of seawater, is intended to be an extension of the classical CTD probes, used for measuring the water conductivity, temperature and depth, and usually equipped with additional instrumentation for measuring the chlorophyll-a concentration and water turbidity. This additional instrumentation is usually very expensive and thus de facto has prevented the realization of a wide network of measuring unit. Starting from this assumption and in line with the Italian regulations in this area, the author proposes a new cheap module for in-vivo detection of chlorophyll-a.
The implementation the aforementioned sensor also requested the implementation of a novel circuit design technique, used to give a full symbolical representation of the circuit, which is then numerically simulated for millions of different combinations of the design parameters in a small time. The computation of a figure of merit thus leads to choose the most appropriate combination of adopted passive components.
The author also present two novel techniques: the first for power consumption characterization of WSN modules, which are usually subjected to high dynamic current variations and the second for the characterization of thermoelectric modules that are intended to be used to provide energy self-sufficiency in cogeneration with solar panel
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
Clothing the practice: Community building, sportification and commodification in CrossFit and parkour
No full textkoamabayili/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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