1,720,974 research outputs found
Produrre al tempo del Covid-19 Una riflessione
No full textIl tema della pandemia legata al Covid-19 e dei suoi riflessi sulla vita di tutti i giorni declinata nei suoi molteplici aspetti, è forse uno degli argomenti che è stato maggiormente affrontato a livello internazionale negli ultimi anni. I tentativi, molteplici, di comprendere quali potessero essere le conseguenze legate alla pandemia hanno preso in considerazione le relazioni tra individui e società, tra l’ambiente naturale e quello costruito, approfondendone caratteri quali quelli culturali, dell’età e del salario, quelli relativi alla progettazione degli edifici, alla densità urbana, alla possibilità di accesso allo spazio verde, alla qualità dell’aria, al trasporto pubblico e all’uso eccessivo dell’auto, oltre a molti altri problemi e interazioni complessi i quali, ancora oggi, hanno un impatto sul benessere urbano della popolazione. Un caso molto interessante sul quale si è riflettuto molto, per lo più dal punto di vista della sua dimensione economica, riguarda la necessità di comprendere se e come la pandemia possa realmente cambiare il nostro modo di produrre e le nostre
aree produttive. Forse, proprio la pandemia potrà fungere da catalizzatore verso la creazione di rinnovate aree produttive, di nuovi modi di produrre e di nuove produzioni, che potrebbero avere proprio nell’infrastruttura paesaggistica la chiave utile a superare l'‘infrastructure divide’ che tanto incide sulla nostra produzione
Optimization of multipendular seismic suspensions for interferometric gravitational-wave detectors
No full textHYDRODYNAMIC PERFORMANCES OF WARPED HARD CHINE DISPLACEMENT HULL FORM
No full textThe results of experimental tests relative to resistance, seakeeping and roll decay of a warped hard chine hull form, suitable for large yacht design are reported. To better investigate the effect of hard chine, a round bilge identical model has been tested. Resistance tests have been performed at FV ranging from 0.90 to 4.14, for three different LCG. Results for resistance, sinkage and trim are given. For the most realistic condition dynamic wetted surface is determined separating pressure and whisker spray areas to allow reliable full scale powering predictions. For the same static trim condition, heave, pitch and accelerations have been measured for head sea at FV = 1.35 and 1.89 in regular waves for different wave length/ship length ratios at constant wave steepness 1/50. Roll decay at five speeds and roll at zero speed were investigated.
The reported data and considerations represent a reference for the implementation of hard chine hull form in the design of displacement and semidisplacement large yachts
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
EXPERIMENTAL INVESTIGATION ON HYDRODYNAMIC PERFORMANCES OF WARPED HARD CHINE DISPLACEMENT HULLFORM
No full textIn this paper the results of experimental tests relative to resistance, seakeeping and roll decay of a warped hard chine hull form, suitable for large yacht design are reported.
All tests have been carried out at University of Naples, using a scale model of 2.00 m LOA. Resistance tests are performed at FV ranging from 0.90 to 4.14, for three different CG longitudinal positions and results for resistance, sinkage and trim are given. For the most realistic condition dynamic wetted surface is determined separating pressure and whisker spray areas to allow reliable full scale powering predictions. For the same static trim condition, heave, pitch and accelerations have been measured for head sea at FV = 1.35 and 1.89 in regular waves for different L/ratios at constant wave steepness H/ = 1/50. At zero speed roll decay and roll in beam seas were investigated. Results of seakeeping tests are given in standard RAO form
Added resistance determination in regular sea according to ITTC recommendation
No full textResistance tests in calm water conditions provide performance predictions of ships in an ideal sea state, which can be found only in sea trials under particular condition. Evaluation of ship resistance in realistic sea condition, or so called added resistance in waves is gaining an increasing importance of scientific community. Determination of additional power (Sea Margin) to install above the calm water power requirements in displacement ship design is becoming very important issue for design and service.
The purpose of this paper is to present towing tank methodologies and procedures for assessment of ship’s added resistance. ITTC Seakeeping Committee indicate two possibilities: tests in regular waves and tests in irregular sea but also comments on precision of procedure, identifying the regular waves procedure more accurate.
This work starts from ITTC guidelines and procedures applying them for two different ship types. One is a tanker model tested in regular and irregular sea to get the information on precision limit according to the ITTC. Another model is fast monohedral planing hull where only regular waves approach can be applied. For both models preliminary calm water resistance tests are carried out before the tests in regular waves. Results and conclusion are given commenting on the towing tank instruments, procedure and model set-up
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
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