1,721,003 research outputs found
Density profile unfolding from Compton scattering measurements in reflection geometry
No full textIn this article, we report a mathematical procedure that allows the unfolding of the density profile from the measurement of an integrated scattering signal containing predominantly the Compton component. An experimental device (patent claimed) has been used for the measurements. It uses a radiation source with white x-ray spectrum (unpolarized) and the reflection geometry to maximize the Compton signal. The algorithm has been tested on light-element, inhomogeneous samples of uniform and non-uniform densities. Incomplete primary volume and multiple scattering corrections are also discussed. The resulting density profiles are in good agreement with direct measurements of profiles performed with other means
La nostra esperienza in tema di terapia chirurgica del cancro del polmone. Annali Italiani di Chirurgia
No full textEffetti meccanici ed ambientali sulla propagazione della cricca per fatica ad elevata temperatura nella superlega ODS MA 6000
No full textDesign of an optical sensor for surface roughness measurements of wood based panels
No full textSurface inspection methods are strategic to accurately monitor the quality of the wood panel surface. Optical techniques represent a unique solution to develop inexpensive, simple, and compact, solid-state sensors. In this paper we propose a preliminary study oriented to investigate the use of light scattering technique to perform online measurements of wood panel surface roughnes
AGE AND MORPHOLOGY OF THE MAIN SEQUENCE FROM HIPPARCOS HR DIAGRAM DATA M. Badiali
No full textWith the help of new recent stellar models, we have studied the distribution in the HR diagram of 2170 stars from the Hipparcos database, subdivided into different groups according to their total velocities with respect to the local Keplerian reference frame and into different groups of metallicity. We discuss the morphology of the main sequence at the boundary between radiative and convective stellar envelopes (B \Gamma V ' 0:3) and the age of the disk and halo stars. Key words: HR diagram; stellar models; age of the disk. 1. INTRODUCTION We obtained two sets of data from the Hipparcos data base: the stars with 0:2 ! B \Gamma V ! 0:6 and radial velocity v r 40 km s \Gamma1 , and all the stars with v r ? 40 km s \Gamma1 , luminosity classes IV and V. The first sample should allow us to study the morphology of the main sequence, in relation to different models for the turbulent convection, the second one to study the turnoff of different classes of space velocity and possibly meta..
Analysis of N-ras Gene-mutations In Medulloblastomas By Polymerase Chain-reaction and Oligonucleotide Probes In Formalin-fixed, Paraffin-embedded Tissues
No full text
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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