1,721,158 research outputs found
Present and Future Isochronous Mass Spectrometry at GSI-FAIR: 25 New Masses of Fission Fragments, Novel Analysis Method, Design of a New Time-of-Flight Detector System
No full textGoing 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
Developments for multiple-reflection time-of-flight mass spectrometers and their application to high-resolution accurate mass measurements of short-lived exotic nuclei Entwicklungen für Multireflexions Flugzeit-Massenspektrometer (MR-TOF-MS) und ihre Anwendung zu hochauflösenden Massenmessungen von exotischen und kurzlebigen Kernen
No full textExperimental Studies of Proton-Unbound Nuclei via In-Flight Decay Spectroscopy
Full text linkSeveral exotic nuclei, located beyond the proton dripline, have been studied in the present thesis. Four new isotopes were discovered, and a variety of nuclear structure findings could be accomplished. In particular, this thesis reports the first observation and spectroscopy of the proton-unbound isotopes in the vicinity of very neutron-deficient isotopes of argon (28Cl, 30Cl, 29Ar, 31Ar and 31K). The corresponding experiments have been performed with the fragment separator FRS of GSI using a start version of the EXPERT setup, which is under construction and designed for experiments with even more exotic nuclei at the Super-FRS of FAIR. A secondary beam of 31Ar ions has been created via projectile fragmentation of 885 MeV/u 36Ar ions with an intensity of 10^9 ions/s impinging on the production target at the entrance of the FRS. The spatial separation of 31Ar ions has been performed with the FRS operated in a special ion-optical mode applying a degrader at F1 to achieve an achromatic focus at the central focal plane F2, where the detector setup of the EXPERT pilot experiment has been installed. The setup consisted of the 4.8 g/cm^2 Be secondary target and an array of silicon microstrip detectors. The proton-unbound isotopes of interest have been studied by the well-established in-flight tracking technique, where the trajectories of the decay products are measured with the array of silicon microstrip detectors. This allows to measure particularly short-lived nuclei, which exhibit half-lives of the range from ns to ps or even below. Using the in-flight decay spectroscopy, the 1p and 2p emission processes have been reconstructed from the measured angular correlation in double "heavy ion + proton" and triple "heavy ion + two protons" coincidences, respectively. In the course of the analysis, the two previously unknown isotopes 28,29Cl, which are unbound with respect to 1p emission, have been observed for the first time. To their ground states, the 1p-separation energies S_p = -1.60(8) and S_p = -0.48(2) MeV, respectively, could be assigned. Excited states of the 2p emitter 31Ar have also been identified for the first time. The high level of isobaric symmetry observed in the 31Ar - 31Al mirror pair allows to assign a 2p-separation energy S_2p = 6(34) keV to the ground state of 31Ar. The obtained ground state energy of 31Ar is the most accurate evaluation available so far. It improves the results of previous estimates by a factor of three. Also, the 2p emitter 29Ar has been discovered. The first excited state of this nucleus with S_2p of -5.50(18) MeV has been identified. One more highlight of this thesis is the discovery of 31K: its observation marks the nuclide, that is hitherto found to be farthest away (four mass units) beyond the proton dripline. It is a 3p emitter and has been studied by means of the angular correlation of its decay products, 28S and 3p. The 3p-separation energy of the 31K ground state has been assigned to S_3p = -4.6(2) MeV. An upper half-life limit of 10 ps of 31K has been derived from the measured decay-vertex distribution. Overall, the performed studies and obtained results are an essential first step towards wider nuclear-structure studies far beyond the proton dripline, where basic nuclear properties, theoretical concepts (like mean-field theory) and the strong nuclear force in general may be examined. They may open a transition from ordered nucleons in nuclei to amorphous nucleon matter.Further investigations exploiting the in-flight decay technique shall be performed within the EXPERT project at the future super-conducting fragment separator Super-FRS. Leading to this direction, this thesis presents recent developments of new EXPERT detectors, which aim at the tracking of neutrons originating from neutron-decay reactions (NeuRad detector) and Time-of-Flight measurements for improved secondary-beam identification (ToF detector) at the Super-FRS. Moreover, the further development and refinement of the in-flight decay technique by using in addition precise longitudinal momentum measurements of the heavy ion from the decay performed by the subsequent spectrometer stages of the separator, has been discussed. A novel, complementary method has been proposed and proven to provide a model-independent evaluation of the spectroscopic information. Finally, prospects to forthcoming physics cases that can be studied, dedicated experiment proposals, intended developments of the EXPERT detectors, and ideas for further investigations of proton-unbound nuclear systems using the in-flight decay technique have been discussed
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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