1,720,961 research outputs found
Measurement of magnetic fields radiated from ESD using field sensors
No full textThe goal of this paper is to show that commercial
sensors, whose frequency response is not specifically designed, can
be effectively used to measure very fast transient fields applying
a proper reconstructing procedure based on the knowledge of the
sensor transfer function. To do this, it is necessary to characterize
a structure supporting a transverse electromagnetic (TEM) field,
that will be used to set up a calibration procedure for elementary
magnetic field sensors. The approach is completely analytical and
allows us to knowrigorously the field inside the structure. From the
knowledge of this field, the transfer function of the sensor, in amplitude
and phase, is evaluated up to 2 GHz. The complete characterization
of the sensor allows us to reconstruct the sensed field from
its output voltage waveform. The calibration procedure is carried
out in time domain and therefore the fast Fourier transform (FFT)
algorithm is used to achieve the sensor transfer function, as well
as an inverse FFT (IFFT) is necessary to retrieve the transient impinging
field. An experimental validation of the procedure shows
the consistency of the approach
Placental NO and uteroplacental blood flow in pregnancy complicated by intrauterine growth retardation
No full text
Rationale and diagnostic consideration in perinatal oncology: a rare case of primitive neck neuroblastoma
No full textThree-dimensional and two-dimensional transvaginal contrast sonography for the assessment of uterine anatomy: a comparison with hysterosalpingography
No full textSevere hypoplasia of the right femur, ipsilateral agenesia of the fibula and twisted right foot in a 24-week-old fetus with proximal femoral focal deficiency (PFFD)
No full textA case of a 24-week-old fetus of non consanguineous parents with an ultrasonographic diagnosis of a short right femur, ipsilateral agenesia of the fibula and a twisted right foot is described. Cordocentesis revealed a normal 46XY karyotype. The parents were informed on treatment options and after psychological counselling they decided to undergo an abortion. Post mortem examination confirmed the diagnosis of a severe right limb malformation
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
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