1,721,021 research outputs found
OBSERVATION OF THE AR2+(3S(2)3P(3)NL) SATELLITE STATES BY THRESHOLD PHOTOELECTRONS COINCIDENCE (TPESCO) SPECTROSCOPY RID G-7348-2011
No full textThe Ar2+(3s(2)3p(3)nl) satellite states between 73 and 85 eV have been observed directly by threshold photoelectrons coincidence (TPEsCO) spectroscopy. The present study extends the previous observations of these states by optical emission spectroscopies to the region close to the Ar3+ ionization. Different features have been discerned in the TPESCO spectrum. A preliminary assignment of these features using the Rydberg formula and values of the quantum defect that are deduced from lower-lying states is proposed
TDCS FOR THE ELECTRON-IMPACT IONIZATION APPROACHING THE DIPOLAR LIMIT RID G-7348-2011
No full textThe parametrization of the multidifferential cross sections recently proposed by Klar and Fehr is specialized to the case of the triple differential cross section for asymmetric (e, 2e) reactions. By comparison with experimental data at 8 keV incident energy it is shown that the first-order interaction models could properly account for the experiment provided the expansion of the exponential operator does not stop at the dipolar term. This is found to be true no matter how small the momentum transfer is
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
Observation of doubly charged atomic and molecular states by Threshold PhotoElectrons COincidence spectroscopy RID G-7348-2011
No full textStates of doubly charged atomic and molecular ions have been studied by Threshold PhotoElectrons COincidence (TPEsCO) spectroscopy. This technique involves the detection, in coincidence, of two zero energy electrons ejected in the photodouble ionisation process. The application of the TPEsCO technique to rare gases and diatomic molecules is discussed. In addition the first observation of the Ar2+(3s(2+)3p(3) nl) satellite states at threshold is reported
Angle-resolved electron energy loss study on the inner-shell excited states of Ne RID G-7348-2011
No full textElectron energy loss spectra in the region below and above the Ne Is ionization threshold have been measured at several scattering angles between 2.4 degrees and 24.4 degrees and at a fixed scattered electron energy of 1.6 keV, while the impact energy has been scanned from 2.46 to 2.52 keV. Singly and doubly excited core states, corresponding to 1s --> nl and 1s2p --> nln'l' transitions, respectively, have been observed. The generalized oscillator strengths for both types of excitations have been derived from the angular variation of the double differential cross section and ab initio calculations have been performed using two methods based on a configuration-interaction approach
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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