1,720,975 research outputs found
The pure rotational spectra of FCPtF and FptI
Full text linkTransitions measured by a chirped pulse Fourier transform microwave spectrometer in the frequency range 6.5-18.5 GHz have been fitted and tentatively assigned to the linear molecules FCPtF and FPtI, each in a electronic state. Laser ablation was used to introduce Pt into the gas phase from a metal rod with natural isotopic abundance. \chem{CF_3I} was used as a source of C, F and I atoms. The products of reactions between the chemical precursors were cooled to a rotational temperature approaching 2K through supersonic expansion of the gaseous sample. Different isotopologues of Pt were observed. The spectra of other palladium and platinum containing complexes obtained in a similar way will be presented.Made available in DSpace on 2017-01-26T21:40:24Z (GMT). No. of bitstreams: 3
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Previous issue date: 2016-06-2
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
Ultraviolet and infrared oscillator strengths for OH+
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Previous issue date: 6OH+ is an important astrophysical species. OH+ has been detected in the interstellar medium by UV and terahertz spectroscopy. Following the recent analysis of OH+ emission spectra,a empirical potential energy surfaces have been calculated for the A3Π and X3Σ − states using the RKR method. Ab initio transition and dipole moment functions were calculated and together with the potential energy surfaces have been used to compute oscillator strengths using Le Roy’s LEVEL program.b The new oscillator strengths account for the Herman–Wallis effect, a rotational dependence in the vibrational wavefunction, and are now in good agreement with the measured lifetime.c The Herman–Wallis effect creates a 5% difference in UV oscillator strengths by J” = 15 and an 80% difference in oscillator strengths by J” = 10 in the IR. We recommend these new oscillator strengths be used to determine OH+ column densities
Spectroscopy of TiO singlet states
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Previous issue date: 6TiO is a molecule of considerable astronomical importance. It is present in the atmospheres of oxygen-rich lowmass stellar objects. Three Fourier transform emission spectra have been used to determine improved and consistent spectroscopic constants of the a1∆, b1Π, d1Σ +, c1Φ and f1∆ states of TiO by fitting the b1Π-a1∆, b1Π- d1Σ +, c1Φ-a1∆ and f1∆-a1∆ systems. This analysis provides the most extensive fit of the TiO singlet states. New bands of the b1Π-a1∆ and c1Φ-a1∆ systems have been measured and an extensive list of line positions will be published
Internal dynamics in SF6···NH3 observed by broadband rotational spectroscopy
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Previous issue date: 25The rotational spectra of SFNH isotopologues have been observed in a pulsed nozzle chirped pulse Fourier-transform microwave spectrometer in the frequency range 6.5-18.5 GHz. The spectrum of SFNH has been fitted to a Hamiltonian describing a symmetric top complex in which two symmetric top subunits undergo free internal rotation about a common symmetry axis. The distance between the centers of mass of the two monomers was found to be 4.15776(7) AA. Challenges associated with fitting textbar textit{m}textbar =1 transitions (correlating with textit{K} of free NH) for SFND imply complicated internal dynamics occurs within the complex
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