1,720,993 research outputs found
Characterization of the Vector Network Analyzer used as primary S-parameter standard
Full text linkIn recent years for the realization of the scattering parameters (S-
parameter) primary standard INRIM adopted a software called VNA
Tools II developed by the Federal Institute of Metrology METAS,
the Swiss NMI. This software guides the user through all the measure-
ment process providing, in the end, the measurement result and its
uncertainty, in a way compliant with the Guide to the Expression of
Uncertainty in Measurement - GUM.
To evaluate the uncertainty of the S-parameter measurements, the
software uses an internal database that contains all the uncertainty
sources necessary for the computation. Those values can be either ex-
tracted from the manufacturer specifications or they can be measured
on the actual instrument used in the laboratory, strategy gives the
most realistic and precise characterization of the set-up employed.
This report describes the characterization procedure of the VNA
used to realize the S-parameters primary standard to obtain the data
necessary for the VNA Tools II database
VNA Characteristics Comparison
No full textIn recent years the technology of the Vector Network Analyzers
(VNAs) is increasing rapidly, and almost every year a new model is
produced from several manufacturers. Agilent Technologies produced
recently a new series of VNAs classified as “Metrological” meaning that
they claim better characteristics than other common instruments.
The INRIM High Frequency Laboratory had the possibility of test-
ing a metrological VNA and compare it with the one used to real-
ize and disseminate the scattering parameters (S-parameters) primary
standard. The results of this comparison are hereby presented
Valori di consenso nel primo confronto nazionale inter-laboratorio potenza in alta frequenza (SIT-AF.01)
No full textTutto Misure - Rivista Nazional
Establishing Reference Value in high frequency power comparisons
No full textAccording to the modern trend, the reference value of a measurement comparison among laboratories is established considering the contribution of all the participants appropriately. The main problem is deciding whether the data are consistent or they have to be discarded because of the evidence that the measured value is too different from the expected one. In this paper, the problem of the data rejection is analyzed for a specific comparison concerning microwave power measurements and a specific decision algorithm is presented
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
CCEM.RF.K5c.CL International Comparison
No full textINRIM participates in an international comparison exercise to verify
the compatibility among different National Metrology Institutes
(NMIs) of scattering parameters (S-parameters) measurement results.
INRIM is only a participant and not the pilot laboratory of the comparison,
for this reason the aim of this technical report is to describe
the characteristic of the comparison itself and detail the measurement
techniques adopted by INRIM in the evaluation of the results and their
uncertainties
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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