1,720,956 research outputs found
La rete antincendio del centro storico di Venezia: risultati delle prime sperimentazioni di campo
No full textLa necessità di garantire un affidabile servizio antincendio al centro storico della città di Venezia, ha portato allo sviluppo di un progetto per una rete dedicata che interessa il centro storico e l’isola della Giudecca. Attualmente circa 44 km dicondotte e 700 idranti antincendio sono già stati posti in opera e assicurano il
servizio in gran parte del centro storico della città. La rete antincendio è alimentata da 6 stazioni di rilancio opportunamente distribuite sul territorio e collegate ai tronchi principali della rete di distribuzione acquedottistica. Le pompe pilota di ciascuna stazione garantiscono una piezometrica minima di 6 bar richiesta dal servizio antincendio nell’intera rete. Quando viene aperto un idrante, la depressione si propaga fino alla centralina più vicina dove, scendendo al di sotto di unprefissato valore, causa l’accensione automatica delle pompe che innalzano la pressione in rete e assicurano l’alimentazione di 2 idranti che erogano un totale di 30 l/s. La necessità di tarare un adeguato modello del fenomeno transitorio allo scopo di verificare la capacità e l’affidabilità dell’intero sistema antincendio, ha suggerito di realizzare una serie di prove specifiche in situ. Dopo una presentazione generale del sistema, nella nota sono descritte le prove fino ad ora sviluppate in una porzione della rete eletta a campo sperimentale
Modular 76-channel instrument for Broadband Raman Spectroscopy
Full text linkRaman microscopy is a label-free and non-invasive technique to reveal the chemical compounds of a sample. However, standard Raman microscopes acquire a single frequency at a time, preventing fast imaging as many biological applications require. Here, we present the preliminary development of a multichannel CMOS-based readout for the simultaneous acquisition of 76 frequencies of the Raman spectrum using the broadband stimulated Raman scattering technique. The acquisition system employs the lock-in technique and a custom multichannel CMOS chip to enable a low-noise operation and a parallel architecture for fast imaging. An FPGA-based DSP chain reduces the low-frequency noise by exploiting a 2-step frequency down-conversion technique. The hardware design of the system based on a motherboard and several module PCBs to realize a highly space-optimized architecture is also presented. Particular emphasis is placed on the experimental results obtained with the 2-step frequency down-conversion technique by means of bench tests
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
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