1,721,259 research outputs found
The behavior of the electromagnetic sensor and its calibration for soil salinity
No full text16 Pags.- 4 Figs.- 6 Tabls. © The Authors. Under a Creative Commons License Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0).This is an English translation from the Authors of the published article :
López-Bruna D, Herrero J. El comportamiento del sensor electromagnético y su calibracíón frente a la salinidad edáfica. Agronomie 16: 95-105 (1996) hhttp://dx.doi.org/10.1051/agro:19960203 http://hdl.handle.net/10261/8412Soil salinity survey is easy with a portable electromagnetic (EM) sensor, but the readings have to be converted to a standard measure of soil salinity, such as soil saturated extract electrical conductivity (ECe). Several authors use nonlinear transformations of the EM readings to avoid collinearity between regression variables or to decrease errors in the estimates. EM data and soil samples at 1 m depth taken in an irrigated plot in three consecutive years showed that linear calibration methods are sufficiently accurate for soil salinity studies. Linear methods also seem to give information on the salinity profile, although this aspect needs to be further tested. Nonlinearities may appear between EM readings and bulk soil electrical conductivity due to the design characteristics of the EM sensor used, but they can be corrected using the technical characteristics provided by the manufacturer.Peer reviewe
Modelling the aerodynamic performance of modern axial flow compressor profiles.A correlative approach using current CFD technology.
No full textSviluppo di un modello correlativo per la previsione delle prestazioni di profili di compressore assiale basato sull'uso di tecniche CF
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
LA RICOSTRUZIONE IMMEDIATA DOPO MASTECTOMIA RADICALE CON PROTESI DI BECKER, RISULTATI A DISTANZA
No full textA NURBS-based optimization tool for axial compressor cascades at design and off-design conditions
No full textProcedura innovativa di ottimizzazione per la progettazione di profili di compressore assiale in condizioni di progetto e fuori progetto. L'uso di una correlazione precedentemente sviluppata dagli autori consente di stimare le condizioni di incidenza di stallo sinistro e destro individuando i limiti del campo di funzionamento del profilo nel processo di ottimizzazione. L'ottimizzazione delle prestazioni aerodinamiche è quindi effettuata non soltanto per l'incidenza di design, ma anche con riferimento all'estensione del range operativo
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